This specification is applicable to the design of industrial circulating cooling water treatment for indirect heat exchange in new construction, expansion and reconstruction projects. GB 50050-1995 Industrial circulating cooling water treatment design specification GB50050-1995 standard download decompression password: www.bzxz.net

Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
50050—95
Code for design of industrial recirculating cooling water treatment
199503-06
1995—10-01
State Bureau of Technical Supervision
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full-text Information System
Jointly Issued
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Code for design of industrial recirculating cooling water treatment treatment
GB50050—95
Editing department: Ministry of Chemical Industry of the People's Republic of ChinaApproving department: Ministry of Construction of the People's Republic of ChinaEffective date: October 1, 1995
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Notice on the release of the national standard "Design Specification for Industrial Circulating Cooling Water Treatment"
Jianbiao [1995]132
According to the requirements of the State Planning Commission's document [1992] No. 490, the "Design Specification for Industrial Circulating Cooling Water Treatment" jointly revised by the Ministry of Chemical Industry and relevant departments has been reviewed by relevant departments. The "Design Specification for Industrial Circulating Cooling Water Treatment" GB50050—95 is now approved as a mandatory national standard, which will be implemented on October 1, 1995, and the original "Design Specification for Industrial Circulating Cooling Water Treatment" GBJ50—83 will be abolished at the same time. This standard is managed by the Ministry of Chemical Industry, and the specific interpretation and other work is undertaken by China Huanqiu Chemical Engineering Company. The publication and distribution is organized by the Standard and Quota Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
March 16, 1995
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Terms and Symbols
Circulating Cooling Water Treatment
General Provisions
Dispersed System Design
Closed System Design
Scale and Corrosion Inhibition
Bacteria and Algae Treatment.
Cleaning and Pre-film Treatment
Bypass Water Treatment
Supplementary Water Treatment
Drainage Treatment
Storage and Dosing of Chemical Agents
Monitoring and Control and testing
Appendix A
Appendix B
Water quality analysis project list
Terms used in this specification
Additional explanation
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Engineering construction standard full text information system
1 General
This specification is formulated to control the scaling, fouling and corrosion caused by water quality in the industrial circulating cooling water system, ensure the heat exchange efficiency and service life of the equipment, and make the industrial circulating cooling water treatment design achieve advanced technology and economic rationality. 2 This specification is applicable to the industrial circulating cooling water treatment design with indirect heat exchange in new construction, expansion and reconstruction projects.
3The design of industrial circulating cooling water treatment should meet the requirements of safe production, environmental protection, energy conservation and water conservation, and facilitate construction, maintenance and operation management. 1.0.4 The design of industrial circulating cooling water treatment should actively and prudently adopt new technologies based on the continuous summary of production practice experience and scientific experiments. 1.0.5
In addition to being implemented in accordance with this specification, the design of industrial circulating cooling water treatment should also comply with the provisions of relevant current national standards and specifications. Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Terms and Symbols
2.1 Terms
Circulating cooling water system Recirculating cooling water system A water supply system that uses water as a cooling medium and consists of heat exchange equipment, cooling equipment, water pumps, pipelines and other related equipment, and is used in a circulating manner. 2.1.2 Open system
Refers to a circulating cooling water system in which the circulating cooling water is directly cooled by contact with the atmosphere. 2.1.3 Closed system Closed system Refers to a circulating cooling water system in which the circulating cooling water is not directly cooled by contact with the atmosphere. 2.1.4 Chemicals
Various chemical substances used in the process of circulating cooling water treatment. 2.1.5 Count of heterotrophic bacteria Calculate the number of heterotrophic bacteria per milliliter of water by the bacterial plate counting method. 2.1.6 Slime
Refers to the viscous and turbid substances mixed with microorganisms and their secreted mucus and other organic and inorganic impurities.
2.1.7 Slime content
Use a standard plankton net to filter a certain amount of water within a certain period of time, put the intercepted suspended matter into a measuring cylinder and let it stand for a certain period of time, and measure the volume of the sludge after precipitation, expressed in mL/m2.
2.1.8 Fouling resistance Fouling resistance represents the value of the degree of heat transfer efficiency reduction caused by sediment on the heat transfer surface of the heat exchange equipment, and the unit is m2K/W.
2.1.9 Corrosion rate Corrosion rate
The average corrosion rate calculated by the weight loss of metal corrosion, the unit is mm/a. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
2.1.10 System capacity volume The sum of all water volumes in the circulating cooling water system. 2.1.11 Cycle of concentration The ratio of the salt concentration of the circulating cooling water to the salt concentration of the make-up water. 2.1.12 Monitoring test coupon A standard metal coupon placed on the monitoring heat exchange equipment or test pipeline for monitoring corrosion.
Prefilming
The process of adding prefilming agent to the circulating cooling water to form a uniform and dense protective film on the metal surface of the cleaned heat exchange equipment. 2.1.14 Indirect heat exchange A form of heat exchange in which the heat exchange media are not in direct contact with each other. 2.1.15 Sidestream
Part of the water is diverted from the circulating cooling water system, treated as required, and then returned to the system.
2.1.16 Permitted retention time of chemicals
The effective time of chemicals in the circulating cooling water system. 2.1.17 Amount of makeup water The amount of water lost during the operation of the circulating cooling water system. 2.1.18 Amount of blowdown The amount of water that needs to be discharged from the circulating cooling water system under the conditions of a certain concentration multiple.
Heat flux density Heat load intensity
The amount of heat transferred per hour by the unit heat transfer surface of the heat exchange equipment, expressed in W/m2. Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
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Cooling tower air flow (m2/h)
Dust content in the air (g/m2)
Content of a certain component in the make-up water (mg/L) Suspended solids content in the make-up water (mg/L)
Content of a certain component in the circulating cooling water (mg/L) Suspended solids content in the circulating cooling water (mg/L) Content of a certain component in the water after bypass treatment (mg/L) Suspended solids content in the water after bypass filtration Floating matter content (mg/L) Chlorine dosage (kg/h)
System first dosage (kg)
Non-oxidizing bactericide dosage (kg) Dosage during system operation (kg/h)
Dosage per unit of circulating cooling water (mg/L) Chlorine dosage per unit of circulating cooling water (mg/L) Suspended matter sedimentation coefficient
Concentration multiple www.bzxz.net
Engineering construction standard full-text information system
Engineering construction standard full-text information system
Circulating cooling water volume (m2/h)
Sewage volume (m/h)
Evaporated water volume (m2/h）
Make-up water volume (m/h)
Bypass treatment water volume (m3/h)
Bypass filtration water volume (m/n)
Wind loss water volume (m*/h）
Design residence time (h)
System volume (m2)
Water volume in equipment (m2)
Pipeline volume (m2)
Volume of pipeline and expansion tank (m)
Pool volume (ms)
Full text of engineering construction standards Information System
Circulating Cooling Water Treatment
General Provisions
3.1.1 The selection of the design scheme for circulating cooling water treatment should be determined through technical and economic comparison based on the requirements of the heat exchange equipment design for the fouling thermal resistance value and corrosion rate, combined with the following factors:
Water quality standards for circulating cooling water;
The amount of water available from the water source and its water quality;
Designed concentration multiple (for knock-open systems); Control conditions required by the circulating cooling water treatment method; Treatment methods for bypass water and make-up water;
The impact of the agent on the environment.
, The water consumption of circulating cooling water should be determined based on the maximum hourly water consumption of the production process, and the water supply temperature should be determined based on the production process requirements and combined with meteorological conditions. 3.1.3 The collection and selection of make-up water quality data shall comply with the following provisions: 3.1.3.1 When the make-up water source is surface water, the monthly water quality full analysis data for one year shall not be less than;
When the make-up water source is groundwater, the seasonal water quality 3.1.3.2
full analysis data for one year shall not be less than;
3.1.3.3 The design of circulating cooling water treatment shall be based on the annual average value of the make-up water quality analysis data, and the equipment capacity shall be verified by the worst water quality. 3.1.4
The water quality analysis items shall comply with the requirements of Appendix A of this specification. The flow rate and heat flux density of the circulating cooling water side of the heat exchange equipment in the dispersed system shall comply with the following provisions:
3.1.5.1 The flow rate of circulating cooling water on the tube side shall not be less than 0.9m/s; the flow rate of circulating cooling water on the shell side shall not be less than 0.3m/s. When the above requirements cannot be met due to the conditions, anti-corrosion coating, backwashing and other measures should be taken; 3.1.5.3 The heat flux density should not be greater than 58.2kW/m. 3.1.6 The fouling thermal resistance and corrosion rate of the circulating cooling water side pipe wall of the heat exchange equipment should be determined according to the production process requirements. When there are no process requirements, it should comply with the following provisions: 3.1.6.1 The fouling thermal resistance of the open system should be 1.72×10-4~3.44×10-^m2·K/W;
3.1.6.2 The fouling thermal resistance of the closed system should be less than 0.86×10-4m2·K/W.
The corrosion rate of carbon steel pipe wall should be less than 0.125mm/a, and the corrosion rate of copper, copper alloy and 3.1.6.3
stainless steel pipe wall should be less than 0.005mm/a. 3.1.7 The water quality standard of circulating cooling water in open system should be determined comprehensively based on the structural form, material, working conditions, fouling thermal resistance value, corrosion rate and water treatment formula of heat exchange equipment, and should comply with the provisions of Table 3.1.7. Water quality standards for circulating cooling water
Suspended solids
Alkalinity of methyl orange
Requirements and conditions of use
Determined according to production process requirements
Heat exchange equipment is plate type, finned tube type, spiral plate type Determined according to the formulation of the agent
Determined according to the formulation of the agent and working conditions
Determined according to the formulation of the agent and industrial and mining conditions
Carbon steel heat exchange equipment
Stainless steel heat exchange equipment
Engineering construction standard full text information system
Allowable value
《500
30~200
≤3 00
Engineering Construction Standard Full Text Information System
Free Nitrogen
Petroleum
Requirements and Use Conditions
The sum of [So2-] and [Cl-]
Requirements for concrete materials in the system shall be in accordance with the provisions of the current "Geotechnical Engineering Code" GB50021-94. The product of [Mg2+] and [SiO2]
At the return water main
Oil refinery
Note: Methyl orange alkalinity is calculated as Cacos,
②Silicic acid is calculated as SiO2:
③Mg2+ is calculated as CaCO:.
Determine.
Allowable value
≤1500
≤175
<15000
<5 (this value should not exceed)
<10 (this value should not exceed)
The water quality standard of circulating cooling water in closed system should be based on production process conditions. The design concentration multiple of circulating cooling water in open system should not be less than 3.0. The concentration multiple can be calculated as follows:
Where N——concentration multiple;
Qm——make-up water volume (m/h);
Q——wastewater volume (m/h);
Qw——wind loss water volume (m/h).
3.1.10 The number of heterotrophic bacteria in circulating cooling water of open system should be less than 5×105/mL; Engineering Construction Standard Full Text Information System4
Water quality analysis items should meet the requirements of Appendix A of this specification. The circulating cooling water side flow rate and heat flux density of heat exchange equipment in the decentralized system shall meet the following requirements:
3.1.5.1 The circulating cooling water flow rate of the tube side should not be less than 0.9m/s; the circulating cooling water flow rate of the shell side should not be less than 0.3m/s. When the above requirements cannot be met due to conditions, anti-corrosion coating, backwashing and other measures should be taken;3.1.5.3 The heat flux density should not be greater than 58.2kW/m. 3.1.6 The fouling thermal resistance and corrosion rate of the circulating cooling water side pipe wall of the heat exchange equipment shall be determined according to the production process requirements. When there is no requirement for the process, it should meet the following requirements: 3.1.6.1 The fouling thermal resistance of the open system should be 1.72×10-4~3.44×10-^m2·K/W;
3.1.6.2 The fouling thermal resistance of the closed system should be less than 0.86×10-4m2·K/W.
The corrosion rate of the carbon steel pipe wall should be less than 0.125mm/a, and the corrosion rate of the copper, copper alloy and 3.1.6.3
stainless steel pipe wall should be less than 0.005mm/a. 3.1.7 The water quality standard of the circulating cooling water of the open system should be determined comprehensively based on the structural form, material, working conditions, fouling thermal resistance, corrosion rate and water treatment formula of the heat exchange equipment, and should meet the requirements of Table 3.1.7. Water quality standards for circulating cooling water
Suspended solids
Alkalinity of methyl orange
Requirements and conditions of use
Determined according to production process requirements
Heat exchange equipment is plate type, finned tube type, spiral plate type Determined according to the formulation of the agent
Determined according to the formulation of the agent and working conditions
Determined according to the formulation of the agent and industrial and mining conditions
Carbon steel heat exchange equipment
Stainless steel heat exchange equipment
Engineering construction standard full text information system
Allowable value
《500
30~200
≤3 00
Engineering Construction Standard Full Text Information System
Free Nitrogen
Petroleum
Requirements and Use Conditions
The sum of [So2-] and [Cl-]
Requirements for concrete materials in the system shall be in accordance with the provisions of the current "Geotechnical Engineering Code" GB50021-94. The product of [Mg2+] and [SiO2]
At the return water main
Oil refinery
Note: Methyl orange alkalinity is calculated as Cacos,
②Silicic acid is calculated as SiO2:
③Mg2+ is calculated as CaCO:.
Determine.
Allowable value
≤1500
≤175
<15000
<5 (this value should not exceed)
<10 (this value should not exceed)
The water quality standard of circulating cooling water in closed system should be based on production process conditions. The design concentration multiple of circulating cooling water in open system should not be less than 3.0. The concentration multiple can be calculated as follows:
Where N——concentration multiple;
Qm——make-up water volume (m/h);
Q——wastewater volume (m/h);
Qw——wind loss water volume (m/h).
3.1.10 The number of heterotrophic bacteria in circulating cooling water of open system should be less than 5×105/mL; Engineering Construction Standard Full Text Information System4
Water quality analysis items should meet the requirements of Appendix A of this specification. The circulating cooling water side flow rate and heat flux density of heat exchange equipment in the decentralized system shall meet the following requirements:
3.1.5.1 The circulating cooling water flow rate of the tube side should not be less than 0.9m/s; the circulating cooling water flow rate of the shell side should not be less than 0.3m/s. When the above requirements cannot be met due to conditions, anti-corrosion coating, backwashing and other measures should be taken;3.1.5.3 The heat flux density should not be greater than 58.2kW/m. 3.1.6 The fouling thermal resistance and corrosion rate of the circulating cooling water side pipe wall of the heat exchange equipment shall be determined according to the production process requirements. When there is no requirement for the process, it should meet the following requirements: 3.1.6.1 The fouling thermal resistance of the open system should be 1.72×10-4~3.44×10-^m2·K/W;
3.1.6.2 The fouling thermal resistance of the closed system should be less than 0.86×10-4m2·K/W.
The corrosion rate of the carbon steel pipe wall should be less than 0.125mm/a, and the corrosion rate of the copper, copper alloy and 3.1.6.3
stainless steel pipe wall should be less than 0.005mm/a. 3.1.7 The water quality standard of the circulating cooling water of the open system should be determined comprehensively based on the structural form, material, working conditions, fouling thermal resistance, corrosion rate and water treatment formula of the heat exchange equipment, and should meet the requirements of Table 3.1.7. Water quality standards for circulating cooling water
Suspended solids
Alkalinity of methyl orange
Requirements and conditions of use
Determined according to production process requirements
Heat exchange equipment is plate type, finned tube type, spiral plate type Determined according to the formulation of the agent
Determined according to the formulation of the agent and working conditions
Determined according to the formulation of the agent and industrial and mining conditions
Carbon steel heat exchange equipment
Stainless steel heat exchange equipment
Engineering construction standard full text information system
Allowable value
《500
30~200
≤3 00
Engineering Construction Standard Full Text Information System
Free Nitrogen
Petroleum
Requirements and Use Conditions
The sum of [So2-] and [Cl-]
Requirements for concrete materials in the system shall be in accordance with the provisions of the current "Geotechnical Engineering Code" GB50021-94. The product of [Mg2+] and [SiO2]
At the return water main
Oil refinery
Note: Methyl orange alkalinity is calculated as Cacos,
②Silicic acid is calculated as SiO2:
③Mg2+ is calculated as CaCO:.
Determine.
Allowable value
≤1500
≤175
<15000
<5 (this value should not exceed)
<10 (this value should not exceed)
The water quality standard of circulating cooling water in closed system should be based on production process conditions. The design concentration multiple of circulating cooling water in open system should not be less than 3.0. The concentration multiple can be calculated as follows:
Where N——concentration multiple;
Qm——make-up water volume (m/h);
Q——wastewater volume (m/h);
Qw——wind loss water volume (m/h).
3.1.10 The number of heterotrophic bacteria in circulating cooling water of open system should be less than 5×105/mL; Engineering Construction Standard Full Text Information System
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