HG 20524-1992 Unified Regulations for Design of Dosing Devices for Circulating Cooling Water Treatment in Chemical Enterprises HG20524-1992 Standard Download and Unzip Password: www.bzxz.net

Industry Standard of the People's Republic of China
Circulating Cooling Water Treatment in Chemical Enterprises
Uniform Regulations for the Design of Dosing Devices
HG 20524-92
Editor: 1
Sixth Design Institute of the Ministry of Chemical Industry
Approving Department: Ministry of Chemical Industry
Engineering Construction Standard Editing Center of the Ministry of Chemical Industry
1992 Beijing
1.0.1 These regulations are compiled to unify the design of circulating cooling water treatment devices in chemical enterprises (excluding cleaning, pre-filming and bypass treatment before factory trial operation). 1.0.2 The design of circulating cooling water treatment devices should conform to national conditions, ensure safe production, facilitate operation and management, and should take into account technological development and actively adopt new technologies. 1.0.3 These regulations apply to the design of new, expanded and rebuilt open circulating cooling water treatment projects. For expansion and reconstruction projects, the actual situation of the factory should be combined to make full use of existing facilities.
1.0.4 The design scale and design standard of circulating cooling water treatment equipment in this regulation are divided into three levels according to the current design, production and use of circulating cooling water treatment equipment at home and abroad: Large (level 1): circulating cooling water volume greater than 10,000m2/h Medium (level 2): ​​circulating cooling water volume less than or equal to 10,000m2/h, greater than or equal to 1,500m2/h
Small (level 3): circulating cooling water volume less than 1,500m2/h. The size of the design scale should be appropriately increased or decreased in combination with production characteristics and the standard push for corrosion and scale inhibition rate requirements and economic conditions. 1.0.5 The equipment, instruments and analytical monitoring facilities required for the design of circulating cooling water treatment equipment should be determined based on the physical and chemical properties of the corrosion, scale and biocide used, the type of agent supply (compound or single variety combination, liquid or solid) and source, and the method of addition. Equipment, instruments and analytical monitoring facilities should actively adopt products with advanced technology, reliable operation, or qualified products that have been identified.
1.0.6 The design shall be closely coordinated with the circulating cooling water treatment test work. In addition to the design in accordance with these regulations, the design of the circulating cooling water treatment device shall also 1.0.72
comply with the current relevant national standards, specifications and regulations. 53
For the design of using liquid chlorine as a biocide to control bacteria and algae, the contents not clarified in these regulations can refer to the "Uniform Regulations for the Design of Chlorination Facilities for Water Treatment in Chemical Enterprises" (HG20523-92).
2 Design of Dosing Device
2.1 Corrosion and Scale Inhibition
The formula of corrosion and scale inhibitors used in circulating cooling water treatment shall be determined through static and dynamic simulation tests based on the water quality of make-up water 2.1.12
, process production characteristics, and heat exchanger structure, material and other conditions.
2.1.2 When a compound formula is used, when the dosage is large and the source of the agent is far from the factory, in order to reduce freight costs, it is possible to consider purchasing monomer agents and preparing and designing them by yourself. 2.1.3 The volume and number of corrosion and scale inhibitor solution tanks should be determined according to the dosage and usage. Large and medium-sized circulating cooling water treatment devices should use two agent solution tanks, and the volume of each should be determined according to the dosage of 12~24h; for small circulating cooling water treatment devices, when using liquid compound formulas, one can be used, and its volume is determined according to the dosage of not less than 24h. 2.1.4 The material of the agent solution tank is determined according to the chemical properties of the agent, and anti-corrosion glass fiber reinforced plastics, stainless steel, steel lining (coating) anti-corrosion materials or other non-metallic anti-corrosion materials with anti-corrosion properties should be used.
2.1.5 The pharmaceutical solution tank should be circular. When its diameter is 550mm~~1000mm and the tank height is less than 1500mm, it should be erected on the ground; when the diameter is equal to or greater than 1200mm, an equipment foundation should be set up, and the foundation height should not be less than 300mm. Both should be equipped with an operating platform.
If the pharmaceutical solution tank needs to be stirred, it should be stirred mechanically or compressed air can be used. 2.1.6 1
2.1.7 When using solid pharmaceuticals, filtering facilities should be installed in the pharmaceutical solution tank or on the liquid outlet pipe. When using liquid pharmaceuticals, whether to install filtering facilities should be determined based on their purity and impurity content.
2.1.8 For the metering of pharmaceutical solutions, corrosion-resistant metering pumps or rotor flow meters should be used. 55
2.1.9 The corrosion and scale inhibitor solution tanks of large, medium and small circulating cooling water systems can be arranged in the same room together with the acid adding tank and the chemicals stored in the system. When the large circulating cooling water system uses a large amount of acid, its acid tank should be set up in a separate room and connected to the dosing room. 2.1.10 The usable building area of ​​large circulating cooling water treatment dosing equipment should not be less than 70m\; the usable building area of ​​medium-sized circulating cooling water treatment dosing equipment should not be less than 50m; the usable building area of ​​small circulating cooling water treatment dosing equipment should not be less than 30m.
The ground and trenches in the dosing room should be treated with anti-corrosion. 2. 1. 111
The dosage is calculated according to the following formula:
Dosage (calculated by commodity), kg/h;
Wherein: G-—#
The loss coefficient of the agent should be determined according to the actual operation experience, generally K
can be 1.10~~1.15;
The percentage of evaporation loss in the circulating cooling water system to the circulating water volume; Pe
Concentration multiple of circulating cooling water;
Circulating cooling water volume, m/h;
Concentration of corrosion and scale inhibitor in circulating cooling water (effective ingredient), mg/1C,
Purity of corrosion and scale inhibitor (or effective concentration), %. 2.1.13 Large-scale circulating cooling water systems operating with alkaline formulas should be equipped with acid-adding facilities, while medium and small-scale circulating cooling water systems may not be equipped with such facilities. 2.1.14 In order to control the increase of pH value in the circulating cooling water system, concentrated sulfuric acid (98% or 93%) should be used for adjustment. The material of the storage, transportation and lifting equipment of concentrated sulfuric acid can be carbon steel. One to two storage tanks can be set up, and their volume is determined by the results of the water treatment test. 2.1.15 When the acid addition tank is arranged on the indoor floor, a cofferdam with a height of not less than 250mm should be set around it. It can also be arranged in a locally deepened ground trough. Anti-corrosion measures must be taken for the ground and cofferdam.
2.1.16 The dosing post is a three-shift work system. For large and medium-sized circulating cooling water systems, there are 156
~2 people per shift; for small circulating cooling water systems, there is 1 person per shift (including acid addition and chlorination). 2.2 Bacteria and algae control
2.2.1 Bacteria and algae control should be determined based on comprehensive consideration of factors such as water quality, bacteria and algae species, characteristics of corrosion and scale inhibitors, and pollution conditions.
2.2.2 The control index of bacteria and algae in circulating cooling water should meet the following requirements: 2.2.2.1 The total number of heterotrophic bacteria is not more than 1×105/ml. 2.2.2.2 The number of iron bacteria is not more than 100/ml. The number of sulfate-reducing bacteria is not more than 50/ml. 2.2.2.3
The amount of sludge (determined by 180-mesh biological filter method) is not more than 4ml/m2, and the water flow velocity at the sampling point is not more than 0.8m/s. 2.2.3
The selection of biocides should meet the following requirements: low toxicity, high efficiency and no obvious interference with corrosion and scale inhibitors. 2. 2. 3. 13
2.2.3.2 Easy to operate.
2.2.3.3 Harmful substances are easy to degrade and easy to handle. 2.2.4 Liquid chlorine is suitable for biocides, and oxidizing biocides such as sodium hypochlorite and chloramine can also be used. Non-oxidizing biocides such as quaternary ammonium salts and chlorophenols can also be used according to water quality, growth of bacteria and algae, and the amount of slime. 2.2.5 When circulating cooling water uses liquid chlorine to control bacteria and algae, it is advisable to design according to the following requirements: 2.2.5.1 Use impact dosing method to control the residual chlorine content to 0.5~~1.0mg/1 and maintain it for 2~3h.
2.2.5.2 The impact dosing amount of hypochlorite is calculated as 24mg/1. 2.2.6 When other oxidizing and non-oxidizing biocides are used for circulating cooling water, the impact dosing amount should be determined according to water quality requirements, bacteria and algae species, growth conditions, etc. 2.2.7 Calculation of biocides dosage
2.2.7.1 Liquid chlorine and other oxidizing biocides can be calculated as follows: G-100:Qa
Amount of oxidizing biocides, kg/h
Where: G
Q Circulating cooling water volume, m/h;
a-Impact dosage, mg/l;
C-Effective content of biocides, %.
2.2.7.2 The dosage of non-oxidizing biocides can be calculated according to the type of agent selected for the test, the required sterilization rate and the method of use. The dosage calculation is the same as formula (2). 2.2.8 Liquid chlorine should be added by a chlorinator. The chlorinator should be selected according to the calculated maximum chlorine addition amount, but there should be a spare, and its spare rate should be 50%~100%. The selected chlorinator should be a product with accurate filling amount, corrosion resistance, excellent performance and easy maintenance. 2.2.9 When the chlorine addition amount of a large circulating cooling water system is large and multiple fluorine dosing machines are used in parallel, it is advisable to install a gas distribution tank (pipe). When the chlorine evaporation amount is insufficient due to low room temperature in winter in non-heating areas, a liquid chlorine evaporator or other measures should be installed. 2.2.10 The design of the chlorination room should meet the following requirements: 2.2.10.1 The chlorination room should be arranged adjacent to the dosing room and should be separated from other work rooms.
2.2.10.2 The chlorination room of large and medium-sized circulating cooling water systems should be separated from the chlorine bottle room, and the total usable building area should not be less than 30m2. 2.2.10.3 The chlorination machine and chlorine bottle of a small circulating cooling water system can be arranged in one room, and the usable building area should not be less than 20m2. 2.2.11 The design of the chlorination room (including the chlorine bottle room) should consider the following safety facilities: 2.2.11.1 Outward-opening door directly leading to the outdoors. 2.2.11.2 An observation window should be set on the door to observe the indoor situation, and an observation window should also be set on the partition wall between the chlorination room and the chlorine bottle.
2.2.11.3 The chlorination room (including the chlorine bottle room) should be cold-proof, fire-resistant, ventilated and lighted. If there are heating facilities indoors, the chlorinator and chlorine bottle should be no less than 1.0m away from the heating facilities. 58
2.2.11.4 Chlorination rooms (including chlorine bottle rooms) of large and medium-sized circulating cooling water systems should be equipped with mechanical ventilation equipment, with a ventilation frequency of 812 times per hour. The exhaust vent should be located at the lower part of the outer wall, and the air inlet should be located at the upper part of the outer wall. The chlorination room of a small circulating cooling water system can be ventilated by blinds installed at the lower part of the outer wall.
2.2.11.5 The control switches of lighting and ventilation equipment should be located outdoors, and anti-corrosion lamps should be used for indoor lighting.
2.2.11.6 The chlorination room (including the chlorine bottle room) of a large circulating cooling water system should be equipped with monitoring instruments and automatic alarm facilities for measuring the chlorine concentration in the air, as well as chlorine absorption facilities.
2.2.11.7 Maintenance tool boxes and personal safety supplies such as gas masks should be installed. The chlorine bottles used in the circulating cooling water system should be equipped with scales as measuring equipment. 2.2.12
2.2.13 The chlorine bottle room of large and medium-sized circulating cooling water systems should be equipped with lifting equipment. When the chlorine content of a single chlorine bottle in a small circulating cooling water system is less than 50k, lifting equipment may not be installed.
2.2.14 The metal material components of electrical equipment in the chlorination room and chlorine bottle room and the indoor floor should be treated with anti-corrosion.
2.2.15 When using a steel cylinder with a chlorine content of 50kg, it should be placed upright and have anti-dumping measures. Steel cylinders with 500kg and 1000kg chlorine capacity should be placed horizontally and firmly positioned when in use.
2.3 Liquid transportation and dosing
2.3.1 Indoor water supply pipes and liquid (corrosion and scale inhibitor, liquid chlorine, acid) pipes in the dosing room and chlorination room should be laid along the wall or overhead, and outdoor liquid delivery pipes should be laid overhead or installed in the trench.
Water supply pipes in the dosing room and chlorination room should be galvanized steel pipes, and liquid delivery pipes 2.3.2
can be made of steel pipes coated with plastic, steel pipes lined with plastic, stainless steel pipes or glass fiber reinforced plastic composite pipes, plastics, etc. The chlorine gas pipe connecting the fluorine bottle and the chlorinator should be made of copper pipes or seamless steel pipes. 2.3.3 Corrosion and scale inhibitor solution and acid solution should be added by metering pumps, or water ejectors. For small circulating cooling water systems, water ejectors or high-level gravity flow can be used for dosing. In addition to using a chlorinator to add liquid chlorine, it can also be added directly by a water ejector. The water inlet pressure should not be less than 0.3MPa
2.3.4 The location of each agent addition point should be designed according to the following conditions: Corrosion and scale inhibitors, acids, and liquid chlorine should be added in the water pool at the bottom of the cooling tower near the water outlet. Corrosion and scale inhibitors can also be added at the water inlet of the circulating water pump suction pool. The corrosion and scale inhibitor addition pipe should extend into the depth of 1/3m2.3.4.2
or 1m below the normal water level in the pool.
2.3.4.3 The acid addition pipe should extend into the water depth of 1/2m below the normal water level, and the ear should not be less than 0.8m from the bottom of the pool.
2.3.4.4 The chlorine addition pipe should extend into the water depth of 2/3m below the normal water level of the pool. Each of the above-mentioned injection nozzles should be equipped with a tubular distributor. 2.4 Storage of reagents
2.4.1 The water treatment reagents of the circulating cooling water system should be stored in the warehouse of the whole plant, and a reagent storage room should be set up in the system.
2.4.2 The storage volume of the reagents in the warehouse of the whole plant should be determined according to the consumption, supply and transportation conditions of the reagents, and the storage volume should be calculated based on the consumption of 15 to 30 days. 2.4.3 The storage volume in the reagent storage room and chlorine bottle room in the system can be calculated based on the consumption of 7 to 15 days. Appropriate open space should be left outdoors for temporary stacking of empty reagent barrels. 2.4.4 Liquid chlorine and toxic reagents should be set up in special warehouses or storage rooms and shall not be randomly stacked in the open air.
2:4.5, chlorine bottles with 500kg and 1000kg of chlorine should be placed horizontally to prevent rolling, and leave space and channels for lifting. The storage height shall not exceed two layers. 2.4.6 Acid storage equipment should be considered uniformly by the whole plant. If tank trucks are used for transportation, the volume of the compensation tank should be calculated based on the transportation volume of one tank truck plus the usage for 10 days. However, the circulating cooling water system operated with alkaline formula can reduce its storage capacity. Acid storage equipment should be closed, and measures such as emptying, maintenance and cleaning should be considered. 24.7
When transporting acid by tank truck, the acid unloading method should adopt negative pressure suction, pump delivery or gravity flow, and compressed air should not be used for direct extrusion. 61
3 Analysis and Monitoring
3.0.1 The design of circulating cooling water treatment equipment should be equipped with analysis, monitoring and control facilities. However, for the circulating cooling water system with a circulating cooling water volume of less than 300m/h and a cooling water temperature difference of less than 5℃, analysis, monitoring and control facilities may not be set up. 3.0.2 Water quality analysis in circulating cooling water treatment includes physical and chemical analysis and bacterial and algae analysis. The full water quality analysis and bacterial and algae analysis should be set up in the central laboratory of the factory. The post analysis should be set up in the circulating cooling water system. The post analysis can be built together with the dosing room or with other production analysis rooms in the block, depending on the scale of the circulating cooling water system and the management system of the factory. It can also be built separately. 3.0.3 The analysis and monitoring items of the circulating cooling water system post analysis room are shown in Table 3.0.3. The analysis and monitoring items should be increased or decreased according to the make-up water quality of the circulating cooling water system, the bypass treatment process, the types of corrosion inhibitors and biocides, as well as the process production characteristics and the conditions that need to be controlled.
Calcium and magnesium hardness
Concentration of corrosion and scale inhibitors
Total inorganic phosphorus
Organic phosphorus
Dissolved zinc
M-alkalinity
Salt content (or conductivity)
Silicon dioxide (SiO2)
Analysis items for bacteria and algae are as follows:
Continued Table 3.0.3
Residual chlorine (Cla)
Corrosion rate
Fouling heat resistance or fouling deposition
Mud amount
Large circulating cooling water system: anaerobic bacteria, iron bacteria, sulfur bacteria, sulfuric acid 3.0. 4.1
Salt-reducing bacteria, ammonia bacteria, fungi, blue algae, diatoms, green algae. Medium-sized circulating cooling water system: anaerobic bacteria, iron bacteria. 3.0.4.2
3.0.4.3 For small-scale circulating cooling water systems, it is not necessary to conduct algae analysis. 3.0.5 The sampling points for water quality analysis of circulating cooling water systems should be set on the following water pipes: 3.0.5.1 Make-up water pipe.
The return pipe of the circulating cooling water system and the outlet pipe of the circulating cooling water. .3.0.5.22
3.0.5.3 The outlet main pipe after bypass treatment. 3.0.5.4 The sewage pipe of the cooling water tank.
3.0.6 For the convenience of analysis and management, each analysis sampling tube should be connected to the post analysis monitoring room, and can also be installed on-site on various pipelines. 3.0.7 For large and medium-sized circulating cooling water systems, it is appropriate to set up a monitoring heat exchanger or a dedicated corrosion and scale inhibitor. Small-scale circulating cooling water systems do not need to be equipped with a monitoring heat exchanger. It is advisable to use 4 to 6 monitoring tubes in the monitoring heat exchanger. The pipe material should be consistent with the key heat exchanger structure, process parameters (temperature, flow rate, etc.) and equipment pipe material used in process production. The water inlet pipe of the monitoring heat exchanger should be connected to the outlet main of the circulating cooling water pressure.
3.0.8 Regardless of the size of the circulating cooling water system, monitoring hangers should be installed. The monitoring hanger should be installed on the return pipe of the circulating cooling water. The monitoring hanger can be a vertical pipe hanger or a horizontally installed tube hanger. The hanger specification should adopt the *HG:5-1526-83\ standard hanger. The number of hangers should be 6, but not less than 4. 632 The chlorination room of large and medium-sized circulating cooling water systems should be separated from the chlorine bottle room, and the total usable building area should be no less than 30m2. 2.2.10.3 The chlorinator and chlorine bottle of a small circulating cooling water system can be arranged in one room, and the usable building area should be no less than 20m2. 2.2.11 The design of the chlorination room (including the chlorine bottle room) should consider the following safety facilities: 2.2.11.1 Outward-opening door directly leading to the outside. 2.2.11.2 An observation window for observing the indoor situation should be set on the door, and an observation window should also be set on the partition wall between the chlorination room and the chlorine bottle.
2.2.11.3 The chlorination room (including the chlorine bottle room) should consider cold protection, fire resistance, ventilation and lighting. If there are heating facilities indoors, the chlorinator and chlorine bottle should be no less than 1.Om away from the heating facilities. 58
2.2.11.4 Chlorination rooms (including chlorine bottle rooms) of large and medium-sized circulating cooling water systems should be equipped with mechanical ventilation equipment, with a ventilation rate of 8-12 times per hour. The exhaust port should be located at the lower part of the outer wall, and the air inlet should be located at the upper part of the outer wall. The chlorination room of a small circulating cooling water system can be ventilated by installing shutters at the lower part of the outer wall.
2.2.11.5 The control switches of lighting and ventilation equipment should be located outdoors, and anti-corrosion lamps should be used for indoor lighting.
2.2.11.6 Chlorination rooms (including chlorine bottle rooms) of large circulating cooling water systems should be equipped with monitoring instruments and automatic alarm facilities for measuring chlorine concentration in the air, as well as chlorine absorption facilities.
2.2.11.7 Maintenance tool boxes and personal safety supplies such as gas masks should be installed. Chlorine bottles used in circulating cooling water systems should be equipped with scales as measuring equipment. 2.2.12
2.2.13 Lifting equipment should be installed in the chlorine bottle room of large and medium-sized circulating cooling water systems. When the chlorine content of a single chlorine bottle in a small-scale circulating cooling water system is less than 50k, lifting equipment may not be installed.
2.2.14 Metal components of electrical equipment and indoor floors in the chlorination room and chlorine bottle room should be treated with anti-corrosion.
2.2.15 Steel cylinders with a chlorine content of 50kg should be placed upright when in use, and anti-dumping measures should be taken. Steel cylinders with a chlorine content of 500kg and 1000kg should be placed horizontally when in use and firmly positioned.
2.3 Liquid transportation and dosingbzxz.net
2.3.1 Indoor water supply pipes and liquid (corrosion and scale inhibitor, liquid chlorine, acid) pipes in the dosing room and chlorination room should be laid along the wall or overhead, and outdoor liquid delivery pipes should be laid overhead or installed in the trench.
Water supply pipes in the dosing room and chlorination room should be galvanized steel pipes, and liquid delivery pipes 2.3.2
can be made of plastic-coated steel pipes, plastic-lined steel pipes, stainless steel pipes or glass fiber reinforced plastic composite pipes, plastics, etc. The chlorine gas pipe connecting the fluorine bottle and the chlorinator should be made of copper pipes or seamless steel pipes. 2.3.3 Corrosion and scale inhibitor solution and acid solution should be added by metering pumps, or water ejectors. For small circulating cooling water systems, water ejectors or high-level gravity flow can be used for addition. In addition to using a chlorinator to add liquid chlorine, it can also be added directly by a water ejector. The water inlet pressure should not be less than 0.3MPa
2.3.4 The location of each agent addition point should be designed according to the following conditions: Corrosion and scale inhibitors, acids, and liquid chlorine should be added in the water pool at the bottom of the cooling tower near the water outlet. Corrosion and scale inhibitors can also be added at the water inlet of the circulating water pump suction pool. The corrosion and scale inhibitor addition pipe should extend into the water pool 1/3m2.3.4.2
or 1m below the normal water level.
2.3.4.3 The acid addition pipe should extend into the water depth of 1/2m below the normal water level, and the ear should not be less than 0.8m from the bottom of the pool.
2.3.4.4 The chlorine addition pipe should extend into the water pool 2/3m below the normal water level. Each of the above-mentioned injection nozzles should be equipped with a tubular distributor. 2.4 Storage of reagents
2.4.1 The water treatment reagents of the circulating cooling water system should be stored in the warehouse of the whole plant, and a reagent storage room should be set up in the system.
2.4.2 The storage volume of reagents in the warehouse of the whole plant should be determined according to the consumption, supply and transportation conditions of the reagents, and the storage volume should be calculated based on the consumption of 15 to 30 days. 2.4.3 The storage volume in the reagent storage room and chlorine bottle room in the system can be calculated based on the consumption of 7 to 15 days. Appropriate open space should be left outdoors for temporary stacking of empty reagent barrels. 2.4.4 Liquid chlorine and toxic reagents should be set up in special warehouses or storage rooms, and shall not be randomly stacked in the open air.
2:4.5, chlorine bottles with chlorine content of 500kg and 1000kg should be placed horizontally to prevent rolling, and leave space and passage for lifting. The storage height shall not exceed two layers. 2.4.6 Acid storage equipment should be considered uniformly by the whole plant. If tank trucks are used for transportation, the volume of the compensation tank should be calculated based on the transportation volume of one tank truck plus the usage for 10 days. However, the circulating cooling water system operated with alkaline formula can reduce its storage capacity. Acid storage equipment should be closed, and measures such as emptying, maintenance and cleaning should be considered. 24.7
When transporting acid by tank truck, the unloading method should adopt negative pressure suction, pump delivery or gravity flow, and compressed air should not be used for direct extrusion. 61
3 Analysis and Monitoring
3.0.1 The design of circulating cooling water treatment equipment should be equipped with analysis, monitoring and control facilities. However, for the circulating cooling water system with a circulating cooling water volume of less than 300m/h and a cooling water temperature difference of less than 5℃, analysis, monitoring and control facilities may not be set up. 3.0.2 Water quality analysis in circulating cooling water treatment includes physical and chemical analysis and bacterial and algae analysis. The full water quality analysis and bacterial and algae analysis should be set up in the central laboratory of the factory. The post analysis should be set up in the circulating cooling water system. The post analysis can be built together with the dosing room or with other production analysis rooms in the block, depending on the scale of the circulating cooling water system and the management system of the factory. It can also be built separately. 3.0.3 The analysis and monitoring items of the circulating cooling water system post analysis room are shown in Table 3.0.3. The analysis and monitoring items should be increased or decreased according to the make-up water quality of the circulating cooling water system, the bypass treatment process, the types of corrosion inhibitors and biocides, as well as the process production characteristics and the conditions that need to be controlled.
Calcium and magnesium hardness
Concentration of corrosion and scale inhibitors
Total inorganic phosphorus
Organic phosphorus
Dissolved zinc
M-alkalinity
Salt content (or conductivity)
Silicon dioxide (SiO2)
Analysis items for bacteria and algae are as follows:
Continued Table 3.0.3
Residual chlorine (Cla)
Corrosion rate
Fouling heat resistance or fouling deposition
Mud amount
Large circulating cooling water system: anaerobic bacteria, iron bacteria, sulfur bacteria, sulfuric acid 3.0. 4.1
Salt-reducing bacteria, ammonia bacteria, fungi, blue algae, diatoms, green algae. Medium-sized circulating cooling water system: anaerobic bacteria, iron bacteria. 3.0.4.2
3.0.4.3 For small-scale circulating cooling water systems, it is not necessary to conduct algae analysis. 3.0.5 The water quality analysis sampling points of the circulating cooling water system should be set on the following water pipes: 3.0.5.1 Make-up water pipe.
The return pipe of the circulating cooling water system and the outlet pipe of the circulating cooling water. .3.0.5.22
3.0.5.3 The outlet main pipe after bypass treatment. 3.0.5.4 The sewage pipe of the cooling water tank.
3.0.6 For the convenience of analysis and management, each analysis sampling tube should be connected to the post analysis monitoring room, and can also be installed on-site on various pipelines. 3.0.7 For large and medium-sized circulating cooling water systems, it is appropriate to set up a monitoring heat exchanger or a dedicated corrosion and scale inhibitor. Small-scale circulating cooling water systems do not need to be equipped with a monitoring heat exchanger. It is advisable to use 4 to 6 monitoring tubes in the monitoring heat exchanger. The pipe material should be consistent with the key heat exchanger structure, process parameters (temperature, flow rate, etc.) and equipment pipe material used in process production. The water inlet pipe of the monitoring heat exchanger should be connected to the outlet main of the circulating cooling water pressure.
3.0.8 Regardless of the size of the circulating cooling water system, monitoring hangers should be installed. The monitoring hanger should be installed on the return pipe of the circulating cooling water. The monitoring hanger can be a vertical pipe hanger or a horizontally installed tube hanger. The hanger specification should adopt the *HG:5-1526-83\ standard hanger. The number of hangers should be 6, but not less than 4. 632 The chlorination room of large and medium-sized circulating cooling water systems should be separated from the chlorine bottle room, and the total usable building area should be no less than 30m2. 2.2.10.3 The chlorinator and chlorine bottle of a small circulating cooling water system can be arranged in one room, and the usable building area should be no less than 20m2. 2.2.11 The design of the chlorination room (including the chlorine bottle room) should consider the following safety facilities: 2.2.11.1 Outward-opening door directly leading to the outside. 2.2.11.2 An observation window for observing the indoor situation should be set on the door, and an observation window should also be set on the partition wall between the chlorination room and the chlorine bottle.
2.2.11.3 The chlorination room (including the chlorine bottle room) should consider cold protection, fire resistance, ventilation and lighting. If there are heating facilities indoors, the chlorinator and chlorine bottle should be no less than 1.Om away from the heating facilities. 58
2.2.11.4 Chlorination rooms (including chlorine bottle rooms) of large and medium-sized circulating cooling water systems should be equipped with mechanical ventilation equipment, with a ventilation rate of 8-12 times per hour. The exhaust port should be located at the lower part of the outer wall, and the air inlet should be located at the upper part of the outer wall. The chlorination room of a small circulating cooling water system can be ventilated by installing shutters at the lower part of the outer wall.
2.2.11.5 The control switches of lighting and ventilation equipment should be located outdoors, and anti-corrosion lamps should be used for indoor lighting.
2.2.11.6 Chlorination rooms (including chlorine bottle rooms) of large circulating cooling water systems should be equipped with monitoring instruments and automatic alarm facilities for measuring chlorine concentration in the air, as well as chlorine absorption facilities.
2.2.11.7 Maintenance tool boxes and personal safety supplies such as gas masks should be installed. Chlorine bottles used in circulating cooling water systems should be equipped with scales as measuring equipment. 2.2.12
2.2.13 Lifting equipment should be installed in the chlorine bottle room of large and medium-sized circulating cooling water systems. When the chlorine content of a single chlorine bottle in a small-scale circulating cooling water system is less than 50k, lifting equipment may not be installed.
2.2.14 Metal components of electrical equipment and indoor floors in the chlorination room and chlorine bottle room should be treated with anti-corrosion.
2.2.15 Steel cylinders with a chlorine content of 50kg should be placed upright when in use, and anti-dumping measures should be taken. Steel cylinders with a chlorine content of 500kg and 1000kg should be placed horizontally when in use and firmly positioned.
2.3 Liquid transportation and dosing
2.3.1 Indoor water supply pipes and liquid (corrosion and scale inhibitor, liquid chlorine, acid) pipes in the dosing room and chlorination room should be laid along the wall or overhead, and outdoor liquid delivery pipes should be laid overhead or installed in the trench.
Water supply pipes in the dosing room and chlorination room should be galvanized steel pipes, and liquid delivery pipes 2.3.2
can be made of plastic-coated steel pipes, plastic-lined steel pipes, stainless steel pipes or glass fiber reinforced plastic composite pipes, plastics, etc. The chlorine gas pipe connecting the fluorine bottle and the chlorinator should be made of copper pipes or seamless steel pipes. 2.3.3 Corrosion and scale inhibitor solution and acid solution should be added by metering pumps, or water ejectors. For small circulating cooling water systems, water ejectors or high-level gravity flow can be used for addition. In addition to using a chlorinator to add liquid chlorine, it can also be added directly by a water ejector. The water inlet pressure should not be less than 0.3MPa
2.3.4 The location of each agent addition point should be designed according to the following conditions: Corrosion and scale inhibitors, acids, and liquid chlorine should be added in the water pool at the bottom of the cooling tower near the water outlet. Corrosion and scale inhibitors can also be added at the water inlet of the circulating water pump suction pool. The corrosion and scale inhibitor addition pipe should extend into the water pool 1/3m2.3.4.2
or 1m below the normal water level.
2.3.4.3 The acid addition pipe should extend into the water depth of 1/2m below the normal water level, and the ear should not be less than 0.8m from the bottom of the pool.
2.3.4.4 The chlorine addition pipe should extend into the water pool 2/3m below the normal water level. Each of the above-mentioned injection nozzles should be equipped with a tubular distributor. 2.4 Storage of reagents
2.4.1 The water treatment reagents of the circulating cooling water system should be stored in the warehouse of the whole plant, and a reagent storage room should be set up in the system.
2.4.2 The storage volume of reagents in the warehouse of the whole plant should be determined according to the consumption, supply and transportation conditions of the reagents, and the storage volume should be calculated based on the consumption of 15 to 30 days. 2.4.3 The storage volume in the reagent storage room and chlorine bottle room in the system can be calculated based on the consumption of 7 to 15 days. Appropriate open space should be left outdoors for temporary stacking of empty reagent barrels. 2.4.4 Liquid chlorine and toxic reagents should be set up in special warehouses or storage rooms, and shall not be randomly stacked in the open air.
2:4.5, chlorine bottles with 500kg and 1000kg of chlorine should be placed horizontally to prevent rolling, and leave space and channels for lifting. The storage height shall not exceed two layers. 2.4.6 Acid storage equipment should be considered uniformly by the whole plant. If tank trucks are used for transportation, the volume of the compensation tank should be calculated based on the transportation volume of one tank truck plus the usage for 10 days. However, the circulating cooling water system operated with alkaline formula can reduce its storage capacity. Acid storage equipment should be closed, and measures such as emptying, maintenance and cleaning should be considered. 24.7
When transporting acid by tank truck, the acid unloading method should adopt negative pressure suction, pump delivery or gravity flow, and compressed air should not be used for direct extrusion. 61
3 Analysis and Monitoring
3.0.1 The design of circulating cooling water treatment equipment should be equipped with analysis, monitoring and control facilities. However, for the circulating cooling water system with a circulating cooling water volume of less than 300m/h and a cooling water temperature difference of less than 5℃, analysis, monitoring and control facilities may not be set up. 3.0.2 Water quality analysis in circulating cooling water treatment includes physical and chemical analysis and bacterial and algae analysis. The full water quality analysis and bacterial and algae analysis should be set up in the central laboratory of the factory. The post analysis should be set up in the circulating cooling water system. The post analysis can be built together with the dosing room or with other production analysis rooms in the block, depending on the scale of the circulating cooling water system and the management system of the factory. It can also be built separately. 3.0.3 The analysis and monitoring items of the circulating cooling water system post analysis room are shown in Table 3.0.3. The analysis and monitoring items should be increased or decreased according to the make-up water quality of the circulating cooling water system, the bypass treatment process, the types of corrosion inhibitors and biocides, as well as the process production characteristics and the conditions that need to be controlled.
Calcium and magnesium hardness
Concentration of corrosion and scale inhibitors
Total inorganic phosphorus
Organic phosphorus
Dissolved zinc
M-alkalinity
Salt content (or conductivity)
Silicon dioxide (SiO2)
Analysis items for bacteria and algae are as follows:
Continued Table 3.0.3
Residual chlorine (Cla)
Corrosion rate
Fouling heat resistance or fouling deposition
Mud amount
Large circulating cooling water system: anaerobic bacteria, iron bacteria, sulfur bacteria, sulfuric acid 3.0. 4.1
Salt-reducing bacteria, ammonia bacteria, fungi, blue algae, diatoms, green algae. Medium-sized circulating cooling water system: anaerobic bacteria, iron bacteria. 3.0.4.2
3.0.4.3 For small-scale circulating cooling water systems, it is not necessary to conduct algae analysis. 3.0.5 The sampling points for water quality analysis of circulating cooling water systems should be set on the following water pipes: 3.0.5.1 Make-up water pipe.
The return pipe of the circulating cooling water system and the outlet pipe of the circulating cooling water. .3.0.5.22
3.0.5.3 The outlet main pipe after bypass treatment. 3.0.5.4 The sewage pipe of the cooling water tank.
3.0.6 For the convenience of analysis and management, each analysis sampling tube should be connected to the post analysis monitoring room, and can also be installed on-site on various pipelines. 3.0.7 For large and medium-sized circulating cooling water systems, it is appropriate to set up a monitoring heat exchanger or a dedicated corrosion and scale inhibitor. Small-scale circulating cooling water systems do not need to be equipped with a monitoring heat exchanger. It is advisable to use 4 to 6 monitoring tubes in the monitoring heat exchanger. The pipe material should be consistent with the key heat exchanger structure, process parameters (temperature, flow rate, etc.) and equipment pipe material used in process production. The water inlet pipe of the monitoring heat exchanger should be connected to the outlet main of the circulating cooling water pressure.
3.0.8 Regardless of the size of the circulating cooling water system, monitoring hangers should be installed. The monitoring hanger should be installed on the return pipe of the circulating cooling water. The monitoring hanger can be a vertical pipe hanger or a horizontally installed tube hanger. The hanger specification should adopt the *HG:5-1526-83\ standard hanger. The number of hangers should be 6, but not less than 4. 634 Chlorination rooms (including chlorine bottle rooms) of large and medium-sized circulating cooling water systems should be equipped with mechanical ventilation equipment, with a ventilation rate of 8-12 times per hour. The exhaust port should be located at the lower part of the outer wall, and the air inlet should be located at the upper part of the outer wall. Chlorination rooms of small-sized circulating cooling water systems can be ventilated by installing blinds at the lower part of the outer wall.
2.2.11.5 Control switches of lighting and ventilation equipment should be located outdoors, and anti-corrosion lamps should be used for indoor lighting.
2.2.11.6 Chlorination rooms (including chlorine bottle rooms) of large-sized circulating cooling water systems should be equipped with monitoring instruments and automatic alarm facilities for measuring chlorine concentration in the air, as well as chlorine absorption facilities.
2.2.11.7 Maintenance tool boxes and personal safety supplies such as gas masks should be installed. Chlorine bottles used in circulating cooling water systems should be equipped with scales as measuring equipment. 2.2.12
2.2.13 Chlorine bottle rooms of large and medium-sized circulating cooling water systems should be equipped with lifting equipment. When the chlorine content of a single chlorine bottle in a small circulating cooling water system is less than 50k, lifting equipment may not be provided.
2.2.14 Metal components of electrical equipment and indoor floors in the chlorination room and chlorine bottle room should be treated with anti-corrosion.
2.2.15 Steel cylinders with a chlorine content of 50kg should be placed upright when in use, and anti-dumping measures should be taken. Steel cylinders with a chlorine content of 500kg and 1000kg should be placed horizontally when in use and firmly positioned.
2.3 Liquid transportation and addition
2.3.1 Indoor water supply pipes and liquid (corrosion and scale inhibitor, liquid chlorine, acid) pipes in the dosing room and chlorination room should be laid along the wall or overhead, and outdoor liquid transportation pipes should be laid overhead or installed in the trench.
Galvanized steel pipes are suitable for water supply pipes in the dosing room and chlorination room. The liquid medicine delivery pipe 2.3.2
can be made of plastic-coated steel pipes, plastic-lined steel pipes, stainless steel pipes or glass fiber reinforced plastic composite pipes, plastics, etc. The chlorine pipe connecting the fluorine bottle and the chlorinator is made of copper pipe or seamless steel pipe. 2.3.3 The corrosion and scale inhibitor solution and acid solution should be added by metering pumps, or water ejectors can be used. Water ejectors or high-level gravity flow can be used for small-scale circulating cooling water systems. In addition to using a chlorinator to add liquid chlorine, it can also be added directly by a water ejector. The water inlet pressure should not be less than 0.3MPa
2.3.4 The location of each agent addition point should be designed according to the following conditions: Corrosion and scale inhibitors, acids, and liquid chlorine should be added in the water pool at the bottom of the cooling tower near the water outlet. Corrosion and scale inhibitors can also be added at the water inlet of the circulating water pump suction pool. The corrosion and scale inhibitor addition pipe should extend into the depth of 1/3m2.3.4.2
or 1m below the normal water level in the pool.
2.3.4.3 The acid addition pipe should extend into the water depth of 1/2m below the normal water level, and the ear should not be less than 0.8m from the bottom of the pool.
2.3.4.4 The chlorine addition pipe should extend into the water depth of 2/3m below the normal water level of the pool. Each of the above-mentioned injection nozzles should be equipped with a tubular distributor. 2.4 Storage of reagents
2.4.1 The water treatment reagents of the circulating cooling water system should be stored in the warehouse of the whole plant, and a reagent storage room should be set up in the system.
2.4.2 The storage volume of the reagents in the warehouse of the whole plant should be determined according to the consumption, supply and transportation conditions of the reagents, and the storage volume should be calculated based on the consumption of 15 to 30 days. 2.4.3 The storage volume in the reagent storage room and chlorine bottle room in the system can be calculated based on the consumption of 7 to 15 days. Appropriate open space should be left outdoors for temporary stacking of empty reagent barrels. 2.4.4 Liquid chlorine and toxic reagents should be set up in special warehouses or storage rooms and shall not be randomly stacked in the open air.
2:4.5, chlorine bottles with 500kg and 1000kg of chlorine should be placed horizontally to prevent rolling, and leave space and channels for lifting. The storage height shall not exceed two layers. 2.4.6 Acid storage equipment should be considered uniformly by the whole plant. If tank trucks are used for transportation, the volume of the compensation tank should be calculated based on the transportation volume of one tank truck plus the usage for 10 days. However, the circulating cooling water system operated with alkaline formula can reduce its storage capacity. Acid storage equipment should be closed, and measures such as emptying, maintenance and cleaning should be considered. 24.7
When transporting acid by tank truck, the acid unloading method should adopt negative pressure suction, pump delivery or gravity flow, and compressed air should not be used for direct extrusion. 61
3 Analysis and Monitoring
3.0.1 The design of circulating cooling water treatment equipment should be equipped with analysis, monitoring and control facilities. However, for the circulating cooling water system with a circulating cooling water volume of less than 300m/h and a cooling water temperature difference of less than 5℃, analysis, monitoring and control facilities may not be set up. 3.0.2 Water quality analysis in circulating cooling water treatment includes physical and chemical analysis and bacterial and algae analysis. The full water quality analysis and bacterial and algae analysis should be set up in the central laboratory of the factory. The post analysis should be set up in the circulating cooling water system. The post analysis can be built together with the dosing room or with other production analysis rooms in the block, depending on the scale of the circulating cooling water system and the management system of the factory. It can also be built separately. 3.0.3 The analysis and monitoring items of the circulating cooling water system post analysis room are shown in Table 3.0.3. The analysis and monitoring items should be increased or decreased according to the make-up water quality of the circulating cooling water system, the bypass treatment process, the types of corrosion inhibitors and biocides, as well as the process production characteristics and the conditions that need to be controlled.
Calcium and magnesium hardness
Concentration of corrosion and scale inhibitors
Total inorganic phosphorus
Organic phosphorus
Dissolved zinc
M-alkalinity
Salt content (or conductivity)
Silicon dioxide (SiO2)
Analysis items for bacteria and algae are as follows:
Continued Table 3.0.3
Residual chlorine (Cla)
Corrosion rate
Fouling heat resistance or fouling deposition
Mud amount
Large circulating cooling water system: anaerobic bacteria, iron bacteria, sulfur bacteria, sulfuric acid 3.0. 4.1
Salt-reducing bacteria, ammonia bacteria, fungi, blue algae, diatoms, green algae. Medium-sized circulating cooling water system: anaerobic bacteria, iron bacteria. 3.0.4.2
3.0.4.3 For small-scale circulating cooling water systems, it is not necessary to conduct algae analysis. 3.0.5 The water quality analysis sampling points of the circulating cooling water system should be set on the following water pipes: 3.0.5.1 Make-up water pipe.
The return pipe of the circulating cooling water system and the outlet pipe of the circulating cooling water. .3.0.5.22
3.0.5.3 The outlet main pipe after bypass treatment. 3.0.5.4 The sewage pipe of the cooling water tank.
3.0.6 For the convenience of analysis and management, each analysis sampling tube should be connected to the post analysis monitoring room, and can also be installed on-site on various pipelines. 3.0.7 For large and medium-sized circulating cooling water systems, it is appropriate to set up a monitoring heat exchanger or a dedicated corrosion and scale inhibitor. Small-scale circulating cooling water systems do not need to be equipped with a monitoring heat exchanger. It is advisable to use 4 to 6 monitoring tubes in the monitoring heat exchanger. The pipe material should be consistent with the key heat exchanger structure, process parameters (temperature, flow rate, etc.) and equipment pipe material used in process production. The water inlet pipe of the monitoring heat exchanger should be connected to the outlet main of the circulating cooling water pressure.
3.0.8 Regardless of the size of the circulating cooling water system, monitoring hangers should be installed. The monitoring hanger should be installed on the return pipe of the circulating cooling water. The monitoring hanger can be a vertical pipe hanger or a horizontally installed tube hanger. The hanger specification should adopt the *HG:5-1526-83\ standard hanger. The number of hangers should be 6, but not less than 4. 634 Chlorination rooms (including chlorine bottle rooms) of large and medium-sized circulating cooling water systems should be equipped with mechanical ventilation equipment, with a ventilation rate of 8-12 times per hour. The exhaust port should be located at the lower part of the outer wall, and the air inlet should be located at the upper part of the outer wall. Chlorination rooms of small-sized circulating cooling water systems can be ventilated by installing blinds at the lower part of the outer wall.
2.2.11.5 Control switches of lighting and ventilation equipment should be located outdoors, and anti-corrosion lamps should be used for indoor lighting.
2.2.11.6 Chlorination rooms (including chlorine bottle rooms) of large-sized circulating cooling water systems should be equipped with monitoring instruments and automatic alarm facilities for measuring chlorine concentration in the air, as well as chlorine absorption facilities.
2.2.11.7 Maintenance tool boxes and personal safety supplies such as gas masks should be installed. Chlorine bottles used in circulating cooling water systems should be equipped with scales as measuring equipment. 2.2.12
2.2.13 Chlorine bottle rooms of large and medium-sized circulating cooling water systems should be equipped with lifting equipment. When the chlorine content of a single chlorine bottle in a small circulating cooling water system is less than 50k, lifting equipment may not be provided.
2.2.14 Metal components of electrical equipment and indoor floors in the chlorination room and chlorine bottle room should be treated with anti-corrosion.
2.2.15 Steel cylinders with a chlorine content of 50kg should be placed upright when in use, and anti-dumping measures should be taken. Steel cylinders with a chlorine content of 500kg and 1000kg should be placed horizontally when in use and firmly positioned.
2.3 Liquid transportation and addition
2.3.1 Indoor water supply pipes and liquid (corrosion and scale inhibitor, liquid chlorine, acid) pipes in the dosing room and chlorination room should be laid along the wall or overhead, and outdoor liquid transportation pipes should be laid overhead or installed in the trench.
Galvanized steel pipes are suitable for water supply pipes in the dosing room and chlorination room. The liquid medicine delivery pipe 2.3.2
can be made of plastic-coated steel pipes, plastic-lined steel pipes, stainless steel pipes or glass fiber reinforced plastic composite pipes, plastics, etc. The chlorine pipe connecting the fluorine bottle and the chlorinator is made of copper pipe or seamless steel pipe. 2.3.3 The corrosion and scale inhibitor solution and acid solution should be added by metering pumps, or water ejectors can be used. Water ejectors or high-level gravity flow can be used for small-scale circulating cooling water systems. In addition to using a chlorinator to add liquid chlorine, it can also be added directly by a water ejector. The water inlet pressure should not be less than 0.3MPa
2.3.4 The location of each agent addition point should be designed according to the following conditions: Corrosion and scale inhibitors, acids, and liquid chlorine should be added in the water pool at the bottom of the cooling tower near the water outlet. Corrosion and scale inhibitors can also be added at the water inlet of the circulating water pump suction pool. The corrosion and scale inhibitor addition pipe should extend into the depth of 1/3m2.3.4.2
or 1m below the normal water level in the pool.
2.3.4.3 The acid addition pipe should extend into the water depth of 1/2m below the normal water level, and the ear should not be less than 0.8m from the bottom of the pool.
2.3.4.4 The chlorine addition pipe should extend into the water depth of 2/3m below the normal water level of the pool. Each of the above-mentioned injection nozzles should be equipped with a tubular distributor. 2.4 Storage of reagents
2.4.1 The water treatment reagents of the circulating cooling water system should be stored in the warehouse of the whole plant, and a reagent storage room should be set up in the system.
2.4.2 The storage volume of the reagents in the warehouse of the whole plant should be determined according to the consumption, supply and transportation conditions of the reagents, and the storage volume should be calculated based on the consumption of 15 to 30 days. 2.4.3 The storage volume in the reagent storage room and chlorine bottle room in the system can be calculated based on the consumption of 7 to 15 days. Appropriate open space should be left outdoors for temporary stacking of empty reagent barrels. 2.4.4 Liquid chlorine and toxic reagents should be set up in special warehouses or storage rooms and shall not be randomly stacked in the open air.
2:4.5, chlorine bottles with 500kg and 1000kg of chlorine should be placed horizontally to prevent rolling, and leave space and channels for lifting. The storage height shall not exceed two layers. 2.4.6 Acid storage equipment should be considered uniformly by the whole plant. If tank trucks are used for transportation, the volume of the compensation tank should be calculated based on the transportation volume of one tank truck plus the usage for 10 days. However, the circulating cooling water system operated with alkaline formula can reduce its storage capacity. Acid storage equipment should be closed, and measures such as emptying, maintenance and cleaning should be considered. 24.7
When transporting acid by tank truck, the acid unloading method should adopt negative pressure suction, pump delivery or gravity flow, and compressed air should not be used for direct extrusion. 61
3 Analysis and Monitoring
3.0.1 The design of circulating cooling water treatment equipment should be equipped with analysis, monitoring and control facilities. However, for the circulating cooling water system with a circulating cooling water volume of less than 300m/h and a cooling water temperature difference of less than 5℃, analysis, monitoring and control facilities may not be set up. 3.0.2 Water quality analysis in circulating cooling water treatment includes physical and chemical analysis and bacterial and algae analysis. The full water quality analysis and bacterial and algae analysis should be set up in the central laboratory of the factory. The post analysis should be set up in the circulating cooling water system. The post analysis can be built together with the dosing room or with other production analysis rooms in the block, depending on the scale of the circulating cooling water system and the management system of the factory. It can also be built separately. 3.0.3 The analysis and monitoring items of the circulating cooling water system post analysis room are shown in Table 3.0.3. The analysis and monitoring items should be increased or decreased according to the make-up water quality of the circulating cooling water system, the bypass treatment process, the types of corrosion inhibitors and biocides, as well as the process production characteristics and the conditions that need to be controlled.
Calcium and magnesium hardness
Concentration of corrosion and scale inhibitors
Total inorganic phosphorus
Organic phosphorus
Dissolved zinc
M-alkalinity
Salt content (or conductivity)
Silicon dioxide (SiO2)
Analysis items for bacteria and algae are as follows:
Continued Table 3.0.3
Residual chlorine (Cla)
Corrosion rate
Fouling heat resistance or fouling deposition
Mud amount
Large circulating cooling water system: anaerobic bacteria, iron bacteria, sulfur bacteria, sulfuric acid 3.0. 4.1
Salt-reducing bacteria, ammonia bacteria, fungi, blue algae, diatoms, green algae. Medium-sized circulating cooling water system: anaerobic bacteria, iron bacteria. 3.0.4.2
3.0.4.3 For small-scale circulating cooling water systems, it is not necessary to conduct algae analysis. 3.0.5 The sampling points for water quality analysis of circulating cooling water systems should be set on the following water pipes: 3.0.5.1 Make-up water pipe.
The return pipe of the circulating cooling water system and the outlet pipe of the circulating cooling water. .3.0.5.22
3.0.5.3 The outlet main pipe after bypass treatment. 3.0.5.4 The sewage pipe of the cooling water tank.
3.0.6 For the convenience of analysis and management, each analysis sampling tube should be connected to the post analysis monitoring room, and can also be installed on-site on various pipelines. 3.0.7 For large and medium-sized circulating cooling water systems, it is appropriate to set up a monitoring heat exchanger or a dedicated corrosion and scale inhibitor. Small-scale circulating cooling water systems do not need to be equipped with a monitoring heat exchanger. It is advisable to use 4 to 6 monitoring tubes in the monitoring heat exchanger. The pipe material should be consistent with the key heat exchanger structure, process parameters (temperature, flow rate, etc.) and equipment pipe material used in process production. The water inlet pipe of the monitoring heat exchanger should be connected to the outlet main of the circulating cooling water pressure.
3.0.8 Regardless of the size of the circulating cooling water system, monitoring hangers should be installed. The monitoring hanger should be installed on the return pipe of the circulating cooling water. The monitoring hanger can be a vertical pipe hanger or a horizontally installed tube hanger. The hanger specification should adopt the *HG:5-1526-83\ standard hanger. The number of hangers should be 6, but not less than 4. 631. The indoor water supply pipes and liquid medicine (corrosion and scale inhibitor, liquid chlorine, acid) pipes in the dosing room and chlorination room should be laid along the wall or overhead. The outdoor liquid medicine delivery pipes should be laid overhead or installed in the trench.
The water supply pipes in the dosing room and chlorination room should be galvanized steel pipes, and the liquid medicine delivery pipes 2.3.2
can be made of plastic-coated steel pipes, plastic-lined steel pipes, stainless steel pipes or glass fiber reinforced plastic composite pipes, plastics, etc. The chlorine gas pipe connecting the fluorine bottle and the chlorinator should be made of copper pipes or seamless steel pipes. 2.3.3 The corrosion and scale inhibitor solution and acid solution should be added by metering pumps, or water ejectors. For small circulating cooling water systems, water ejectors or high-level gravity flow can be used. In addition to using a chlorinator to add liquid chlorine, it can also be added directly by a water ejector. The water inlet pressure should not be less than 0.3MPa
2.3.4 The location of each agent addition point should be designed according to the following conditions: Corrosion and scale inhibitors, acids, and liquid chlorine should be added in the water pool at the bottom of the cooling tower near the water outlet. Corrosion and scale inhibitors can also be added at the water inlet of the circulating water pump suction pool. The corrosion and scale inhibitor addition pipe should extend into the water pool 1/3m2.3.4.2
or 1m below the normal water level.
2.3.4.3 The acid addition pipe should extend in
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