This regulation applies to the design of circulating cooling water treatment for indirect heat exchange in new construction, expansion and reconstruction projects of chemical enterprises. HG/T 20690-2000 Technical regulations for circulating cooling water treatment design of chemical enterprises (with clause explanation) HG/T20690-2000 standard download decompression password: www.bzxz.net

Industry Standard of the People's Republic of China
HG/T 20690 -2000
Specification on Design of Recirculating Cooling WaterTreatment for Chemical Enterprises2000 -09-30
2001 -06 - 01
State Administration of Petroleum and Chemical Industry
Document of State Administration of Petroleum and Chemical Industry
State Petrochemical Administration (2000) No. 361
Notice on Approval of Six Chemical Industry Standards Including "General Drawing of H-Beam Steel Structure Pipe Rack (Truss Type Pipe Rack)"China Chemical Exploration and Design Association:
According to the project plan for the formulation and revision of engineering construction standards of our bureau and the former Ministry of Chemical Industry, the draft of six chemical industry standards including "General Drawing of H-Beam Steel Structure Pipe Rack (Truss Type Pipe Rack)" organized and completed by your unit has been approved by our bureau and is now published. Standard name and number: Recommended standard:
Standard number
HG/T 21640. 1 - 2000
HG/T 21640.2 -- 2000
HG/T 21640. 3 -- 2000
HG/T 20670 - 2000
HG/T 20690 - 2000
Standard name
General drawing of H-shaped steel structure pipe rack
(Truss type pipe rack)
General drawing of H-shaped steel structure pipe rack
(Longitudinal beam type pipe rack)
General drawing of H-shaped steel structure pipe rack
(Independent type pipe rack)
Chemical and petrochemical pipe racks and pipe piers
Design regulations
Circulating cooling water treatment in chemical enterprises
Design technical regulations
HG/T20698-2000
Chemical heating, ventilation and air conditioning
Design regulations
The above standards shall be implemented from June 1, 2001. State Administration of Petroleum and Chemical Industry
September 30, 2000
China Chemical Exploration and Design Association
China Chemical Exploration and Design Association [2000] No. 180
Notice on the editing and issuing of six chemical industry standards including "General Drawing of H-shaped Steel Pipe Rack (Trundle Pipe Rack)" National Chemical Engineering Construction Standard Editing Center: According to the notice of Guoshihua Zhengfa (2000) No. 361, the State Administration of Petroleum and Chemical Industry has approved six chemical industry standards including "General Drawing of H-shaped Steel Pipe Rack (Trundle Pipe Rack)". Based on this, our association entrusts your center to edit and issue the above standards. The standard name and number are shown in No. 361. China Chemical Engineering Exploration and Design Association
October 3, 2000
Industry Standard of the People's Republic of China
Technical Specification on Design of Recirculating Cooling WaterTreatment for Chemical EnterprisesHG/T 20690 - 2000
Editor: China Huanqiu Chemical Engineering CorporationApproval department: State Administration of Petroleum and Chemical IndustryImplementation date: June 1, 2001National Chemical Engineering Construction Standard Editing Center (formerly Engineering Construction Standard Editing Center of the Ministry of Chemical Industry) 2001
In accordance with the requirements of Document No. 1998 (34) of China Chemical Engineering Exploration and Design Association, the National Chemical Water Supply and Drainage Design Technology Center Station organized China Huanqiu Chemical Engineering Corporation and other relevant units to revise the "Technical Specification on Design of Recirculating Cooling Water Treatment for Chemical Enterprises" (CD80A3-85).
This revision is based on the original provisions of this regulation. According to the current policies and guidelines of my country's economic construction, it has widely absorbed the practical experience of circulating cooling water treatment design in chemical enterprises, and according to the level of pharmaceutical development, it strives to make the revised regulations more operable and provide better guidance for the circulating cooling water treatment design of chemical enterprises.
The main technical contents of the revision are: 1. Added terminology symbols; 2. Modified the concentration multiple index; 3. Modified the water quality standard of circulating cooling water; 4. Rewritten the relevant provisions on corrosion inhibition and scale inhibition to make the provisions more suitable for the current level of pharmaceuticals; 5. Rewritten the provisions on cleaning, pre-filming and storage and preparation of pharmaceuticals to make the provisions more operable; 6. Added the acid addition amount calculation formula and supplemented the circulating cooling water water volume calculation formula. The revised regulations have increased from 8 chapters and 96 articles to 8 chapters and 127 articles. The National Chemical Water Supply and Drainage Design Technology Center is responsible for interpreting this regulation. Address: No. 70, Wangjiang East Road, Hefei City, Anhui Province
Editor of the revision of this regulation: China Global Chemical Engineering Corporation Co-editor: The Third Design Institute of the Ministry of Chemical Industry (Donghua Engineering Corporation), Yangzi Petrochemical Corporation
Main drafters: Xue Shusen, Han Ling, Bao Yihua Co-editor: Wujin Zhongnan Chemical Co., Ltd. Wujin Water Stabilizer Factory
Shandong Huate Corporation
Wujin Xinghuo Chemical Plant
Terms and symbols
Circulating cooling water treatment
General provisions
Dispersed system design
Closed system design
Scale and corrosion inhibition
Algae control
Cleaning and pre-filming
Sidestream filtration water treatment
Supplementary water treatment
Drainage treatment|| tt||Storage, preparation and addition of reagents
General provisions
Preparation and addition of corrosion and scale inhibitors
Storage and addition of liquid chlorine
Storage and addition of acid solution
Monitoring, control and testing
Appendix A
Appendix B
Appendix C
Appendix D
Article explanation
Water quality analysis project list
Water quality analysis data verification
Calculation formula for natural pH value and alkalinity of circulating cooling water Explanation of terms used in this regulation
1 General provisions
These regulations are specially formulated to effectively control scaling, fouling and corrosion caused by circulating cooling water, ensure the heat exchange efficiency and service life of equipment, and make the circulating cooling water treatment design of chemical enterprises achieve advanced technology and economic rationality. 1.0.2·These regulations apply to the design of circulating cooling water treatment for indirect heat exchange in new construction, expansion and reconstruction projects of chemical enterprises.
The design of circulating cooling water treatment in chemical enterprises shall meet the requirements of safe production, environmental protection, energy conservation and water conservation, and facilitate construction, maintenance and operation management. The design of circulating cooling water treatment in chemical enterprises shall be based on domestic technical conditions1.0.4
and the supply of pharmaceutical agents, absorb advanced domestic and foreign experience, and actively adopt new technologies. 1.0.5
In addition to being implemented in accordance with these regulations, the design of circulating cooling water treatment in chemical enterprises shall also comply with the current relevant national standards, specifications and chemical industry standards and specifications. 2 Terms and symbols
2.1 Terms
2.1.1 Circulating cooling water system Recirculating cooling water system A water supply system that uses water as a cooling medium and circulates, consisting of heat exchange equipment, cooling equipment, water pumps, pipelines and other related facilities. 2.1.2 Open system
Refers to a circulating cooling water system in which the circulating cooling water is directly in contact with the air for cooling. 2.1.3 Closed system
Refers to a circulating cooling water system in which the circulating cooling water is not directly in contact with the air for cooling. 2.I.4 Chemicals
Various chemicals used in the circulating cooling water treatment process. 2.1.5 Count of heterotrophic bacteria 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 a viscous and turbid substance in which microorganisms and their secreted mucus are mixed with other organic and inorganic impurities.
2.1.7 Slime contentbZxz.net
Indicates the volume of slime contained in each cubic meter of circulating cooling water, expressed in ml/m, and its value is determined by the biological filter method.
2.1.8 Fouling resistance Fouling resistance indicates the degree of decrease in heat transfer efficiency due to deposits on the heat transfer surface of the heat exchange equipment, and the unit is m2·K/W.
2.1.9Corrosion rateCorrosion rate
Average corrosion rate calculated by weight loss of metal corrosion, in mm/a. 2.1.10
System capacityvolumeThe sum of all water volumes in the circulating cooling water system. 2.1.11: Cycle of concentrationThe ratio of the concentration of soluble salts in the circulating cooling water to the concentration of soluble salts in the replenishing water. 2. 1.12
Monitoring test couponMonitoring test couponStandard metal test coupon placed on the monitoring heat exchange equipment or test pipeline for monitoring corrosion.
Prefilrming
The process of circulating water with pre-filming agent through the cleaned heat exchange equipment to form a uniform and dense protective film on the metal surface of the equipment. 2.1.14
Indirect heat exchangeIndirect heat exchangeA heat exchange method in which the heat exchange medium is in indirect contact. Side stream
Part of the water diverted from the circulating cooling water system and returned to the system after filtering as required.
2. 1. 16 Permitted retention time of chemicals The average effective time of chemicals in the circulating cooling water. 2.1.17 Amount of make up water Used to replenish the water lost by the circulating cooling water system during operation. 2.1.18
Amount of blowdown: The amount of water that needs to be discharged from the circulating cooling water system under certain concentration conditions.
Heat load intensity
The amount of heat transferred per unit heat transfer surface of the heat exchange equipment per unit time. Expressed in W/m2. Article number
Appendix B
3.4.10 -3
3. 4. 10 -1.2, 3
Appendix B
Appendix A
2.2 Symbols
Table 2.2 Symbols
Anion concentration ([H*Imol/L)
Air volume entering cooling tower (ml/h)
System initial acid addition (kg)
Acid addition during system operation (kg/h)
Acid addition concentration (mg/L)
Cation concentration ([H*]mol/L)
Acid concentration (%)
Dust content in air (g/m2)
Suspended matter concentration in make-up water (mg/L)| |tt||Concentration of suspended solids in circulating cooling water (mg/L)
Concentration of suspended solids in filtered water (mg/L)
Calibration error of water quality analysis (%)
Surface area in pipe (cm2)
Amount of chlorine added (kg/h)
Amount of system first drink added (kg)
Amount of non-oxidizing biocide added (kg)
Amount of system added during operation (kg/h)
Article number
Appendix C
Appendix C
Appendix C
3.1.8-2.3
Appendix C
5. 0. 6 - 1, 2
5. 0. 4 -1, 2
Continued Table 2.2
Dosing concentration (mg/L)
Chlorine concentration (mg/L)
Non-oxidizing biocide dosing concentration (mg/L)Make-up water hardness (mg/L)
Coefficient (1/℃)
Suspended matter sedimentation coefficient
Circulating cooling water alkalinity (mg/L)
Alkalinity of circulating cooling water when it reaches pH control value after acidification (mg/L)Make-up water alkalinity (mg/L)
Alkalinity of circulating cooling water when it reaches natural pLI value after concentration (ng/L)Fouling adhesion rate [mg/(cm2·30d)] (m·c·m) l
Concentration multiple
Discharge percentage (%)
Evaporation percentage (%)
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