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Delivery: <= 10 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 50050-2017: Code for design of industrial recirculating cooling water treatment Status: Valid GB/T 50050: Historical versions
Basic dataStandard ID: GB/T 50050-2017 (GB/T50050-2017)Description (Translated English): Code for design of industrial recirculating cooling water treatment Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: P40 Classification of International Standard: 91.140.60 Word Count Estimation: 87,864 Date of Issue: 2017-05-27 Date of Implementation: 2018-01-01 Older Standard (superseded by this standard): GB 50050-2007 Quoted Standard: GB 50013; GB 8978; GB 11984; GB 18918 Regulation (derived from): Housing and Urban-Rural Development Bulletin 2017 No. 1576 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Summary: This standard is applicable to the industrial circulating cooling water treatment design for the construction, expansion and reconstruction of surface water, groundwater and reclaimed water as make-up water. GB/T 50050-2017: Code for design of industrial recirculating cooling water treatment---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.1 General 1.0.1 In order to implement the national principles and policies of saving water resources, saving energy and protecting the environment, and make the design of industrial circulating cooling water treatment be technologically advanced, economical, practical, safe and reliable, this specification is formulated. 1.0.2 This specification is applicable to the design of industrial circulating cooling water treatment for new construction, expansion and reconstruction projects that use surface water, groundwater and recycled water as supplementary water. 1.0.3 The design of industrial circulating cooling water treatment should absorb advanced production practice experience and scientific research achievements at home and abroad, meet the requirements of safe production, environmental protection, energy saving and water saving, and facilitate construction, maintenance and operation management. 1.0.4 The design of industrial circulating cooling water treatment shall not only comply with this specification, but also comply with the current relevant national standards. 2 Terms and symbols 2.1 Terminology 2.1.1 recirculating cooling water system A water supply system that uses water as the cooling medium and runs in circulation, consisting of heat exchange equipment, cooling equipment, treatment facilities, water pumps, pipelines and other related facilities. 2.1.2 surface water surface water Refers to the water existing on the land surface exposed to the atmosphere, such as rivers, lakes, glaciers and swamps, excluding sea water. 2.1.3 open system open system A general term for indirect cooling open and direct cooling systems. 2.1.4 indirect open recirculating cooling water system indirect open recirculating cooling water system The circulating cooling water system with indirect heat transfer between the circulating cooling water and the cooled medium and the direct contact between the circulating cooling water and the atmosphere for heat dissipation is referred to as the indirect cooling open system. 2.1.5 direct open recirculating cooling water system The circulating cooling water system in which the circulating cooling water is in direct contact with the cooled medium to exchange heat and the circulating cooling water is in direct contact with the atmosphere to dissipate heat is referred to as the direct cooling system. 2.1.6 Indirect closed recirculating cooling water system indirect closed recirculating cooling water system The circulating cooling water system in which the circulating cooling water and the cooled medium indirectly transfer heat and the circulating cooling water does not come into contact with the atmosphere is referred to as a closed system. 2.1.7 Pharmacy chemicals Various chemicals used in circulating cooling water treatment. 2.1.8 Total count of aerobic heterotrophic bacteria The number of heterotrophic colonies per milliliter of water was counted by the bacterial plate count method, and the unit was CFU/mL. 2.1.9 Biological slime slime A viscous substance in which microorganisms and their secreted mucus are mixed with other organic and inorganic impurities. 2.1.10 Biological slime amount slime content The volume of biological slime contained in the circulating cooling water measured by the biological filter method, the unit is mL/m3. 2.1.11 fouling resistance The numerical value of the decrease in heat transfer efficiency due to deposits on the heat transfer surface of the heat exchange equipment, in m2·K/W. 2.1.12 corrosion rate corrosion rate The annual average corrosion depth calculated from metal corrosion weight loss, in mm/a. 2.1.13 Adhesion rate The amount of dirt growth per month on the unit heat transfer surface of the heat exchanger, in mg/(cm2·month). 2.1.14 system water volume system capacity volume The sum of all water volumes in the circulating cooling water system, in m3. 2.1.15 cycle of concentration Ratio of circulating cooling water to make-up water salinity. 2.1.16 monitoring test coupon Standard metal test strips placed in monitoring heat exchange equipment, test tubes or tower pools for monitoring corrosion. 2.1.17 prefilming The process of circulating the pre-film liquid through the heat exchange equipment to form a uniform and dense protective film on the metal surface. 2.1.18 side stream The part of water that is diverted from the circulating cooling water system and treated before returning to the system. 2.1.19 Permitted retention time of chemicals The effective time of the agent in the circulating cooling water system. 2.1.20 amount of makeup water It refers to the amount of water lost during the operation of the supplementary circulating cooling water system, and the unit is m3/h. 2.1.21 amount of blowdown Under the condition of determined concentration multiple, the amount of water that needs to be discharged from the circulating cooling water system, the unit is m3/h. 2.1.22 Reclaimed water reclaimed water After the sewage is treated, the water quality meets the water utilization requirements. 2.1.23 stability index stability index Refers to the difference between twice the saturated pH of the water and the actual pH of the water. This is used to determine the corrosion or scaling tendency of the water. 2.1.24 scaling inhibition Inhibit or delay the formation and growth of scale in the circulating cooling water system. 2.1.25 corrosion inhibition Inhibit or delay the process of metal corrosion in the circulating cooling water system. 2.2 Symbols A——cooling tower air flow rate (m3/h); Ac——dosing amount of sulfuric acid (kg/h); C——air dust content (g/m3); Cmi——the content of a certain component in supplementary water (mg/L); Cms——supplemented water suspended solids content (mg/L); Crs - suspended solids content in circulating cooling water (mg/L); Cri——the content of a certain component in circulating cooling water (mg/L); Csi——the content of a certain component in the water after side stream treatment (mg/L); Css——Suspended solids content in filtered water (mg/L); Gf——dosing amount for the first time (kg); Go—dosage of oxidizing biocide (kg/h); Gr—dosage dosage during system operation (kg/h); g—dosage per liter of circulating cooling water (mg/L); go—dosage of oxidized biocide per liter of circulating cooling water (mg/L); Ks—sedimentation coefficient of suspended solids; k——evaporation loss coefficient (1/°C); Mm—Alkalinity of supplemented water (mg/L, calculated as CaCO3); Mr - circulating cooling water to control alkalinity (mg/L, calculated as CaCO3); N—concentration multiple; Qb——the amount of sewage (m3/h); Qb1——forced sewage discharge volume (m3/h); Qb2——the amount of water lost during the treatment of circulating cooling water, that is, the amount of natural sewage (m3/h); Qe——the amount of evaporated water (m3/h); Qm——Supplementary water volume (m3/h); Qr——circulating cooling water volume (m3/h); Qsf - side filter water volume (m3/h); Qsi——side flow treatment water volume (m3/h); Qw——Water loss by wind (m3/h); RSI - Stability Index; Td——design residence time (h); Δt——The temperature difference between the circulating cooling water entering and exiting the cooling tower (°C); V——system water volume (m3); Ve - water volume in circulating cooling water pumps, heat exchangers, other water treatment facilities and other equipment (m3); Vp——the volume of water in the process production equipment (m3); Vk——water volume of expansion tank or water tank (m3); Vr——the volume of the circulating cooling water pipe (m3); Vt - pool water volume (m3). 3 Circulating cooling water treatment3.1 General provisions 3.1.1 The circulating cooling water treatment plan should be determined according to the water balance plan and salt balance plan of the whole plant, combined with the comprehensive technical and economic comparison of the water treatment process of the whole plant. The design plan should include the following. 1 Supplementary water source, water quantity, water quality and treatment plan; 2 Design concentration ratio, scale and corrosion inhibition, cleaning and pre-membrane treatment scheme and control conditions; 3 System drainage treatment plan; 4 side stream water treatment scheme; 5 Microbiological control program. 3.1.2 The amount of circulating cooling water shall be determined according to the maximum hourly water consumption of the production process. 3.1.3 The collection of supplementary water quality data should meet the following requirements. 1 Supplementary water is surface water, and monthly water quality analysis data should not be less than one year; 2 The supplementary water is groundwater, and the full analysis data of water quality from season to season should not be less than one year; 3 Supplementary water is reclaimed water, and monthly full analysis data of water quality should not be less than one year, including reclaimed water source composition and treatment process, etc.; 4 The water quality analysis items should meet the requirements of Appendix A of this specification, and the water quality analysis error should meet the requirements of Appendix B of this specification. 3.1.4 The water quality design basis for supplementary water shall adopt the average value of water quality analysis data, and check the equipment capacity with the most unfavorable water quality. 3.1.5 The control conditions and indicators of the circulating cooling water heat exchange equipment of the intercooling open system shall meet the following regulations. 1 The flow velocity of the circulating cooling water pipe should be greater than 1.0m/s; 2 The shell-side velocity of circulating cooling water should be greater than 0.3m/s; 3.The side wall temperature of the cooling water on the heat transfer surface of the equipment should not be higher than 70°C. When the temperature of the heat exchange medium is higher than 115°C, heat recovery measures should be taken before cooling with circulating cooling water; 4 The thermal resistance value of dirt on the water side of the heat transfer surface of the equipment should not be greater than 3.44×10-4m2·K/W; 5 The adhesion rate on the water side of the heat transfer surface of the equipment should not exceed 15mg/(cm2·month), and the oil refining industry should not exceed 20mg/(cm2·month); 6 The corrosion rate of the water side of the heat transfer surface of carbon steel equipment should be less than 0.075mm/a, and the corrosion rate of the water side of the heat transfer surface of copper alloy and stainless steel equipment should be less than 0.005mm/a. 3.1.6 The thermal resistance value of the dirt on the water side of the heat transfer surface of the closed system equipment should be less than 0.86×10-4m2·K/W, and the corrosion rate should meet the provisions of Item 6 of Article 3.1.5 of this code. 3.1.7 The water quality index of the circulating cooling water of the intercooling open system should be based on the water quality of the make-up water and the structural form, material, working conditions, thermal resistance of dirt, corrosion rate, properties of the heat-exchanging medium combined with water treatment chemicals Formula and other factors are determined comprehensively, and should meet the requirements in Table 3.1.7. Table 3.1.7 Water Quality Index of Circulating Cooling Water in Intercooled Open System 3.1.8 The water quality index of the circulating cooling water in the closed system shall be determined according to the characteristics of the system and the requirements of the water-using equipment, and shall comply with the provisions in Table 3.1.8. Table 3.1.8 Closed system cooling water quality indicators Note. ① The electrical conductivity of the shared circulation system of the dual-water internal cooling unit in thermal power plants and the independent cooling water system of the rotor should not exceed 5.0μS/cm (25°C). ②The copper content in the cooling water of the double-water internal cooling unit should not exceed 40.0μg/L. ③ Control only when pH< 8.0. ④ The make-up water of the closed system of the iron and steel plant should be demineralized water, and the other two systems should be demineralized water. 3.1.9 The water quality index of the circulating cooling water of the direct cooling system shall be comprehensively determined according to the process requirements and combined with factors such as the supplementary water quality, working conditions and chemical treatment formula, and shall comply with the provisions in Table 3.1.9. Table 3.1.9 Water Quality Index of Circulating Cooling Water in Direct Cooling System 3.1.10 When the sum of calcium hardness and total alkalinity of the intercooling open system and direct cooling system is greater than 1100mg/L (calculated as CaCO3) or the stability index RSI is less than 3.3, sulfuric acid should be added or softened. 3.1.11 The design concentration factor of the indirect cooling open system should not be less than 5.0, and should not be less than 3.0; the design concentration factor of the direct cooling system should not be less than 3.0.The concentration factor can be calculated as follows. In the formula. N—concentration ratio; Qm——Supplementary water volume (m3/h); Qb——the amount of sewage (m3/h); Qw——Water loss by wind (m3/h). 3.1.12 The microbial control index of the intercooler open system should meet the following requirements. 1 The total number of heterotrophic bacteria should not be greater than 1×105 CFU/mL; 2 The amount of biological slime should not be greater than 3mL/m3. 3.2 System Design 3.2.1 The design residence time of circulating cooling water in the open system should not exceed the allowable residence time of the agent. The design residence time can be calculated as follows. In the formula. Td - design residence time (h); V——system water volume (m3). 3.2.2 The water volume of the intercooled open system should be less than 1/3 of the circulating cooling water volume, and the system water volume can be calculated according to the following formula. In the formula. Ve - water volume in circulating cooling water pump, heat exchanger and other water treatment equipment (m3); Vr——the volume of the circulating cooling water pipe (m3); Vt - pool water volume (m3). 3.2.3 The water volume of the closed system can be calculated according to the following formula. In the formula. Vp - water volume in the process production equipment (m3); Vk——water volume of expansion tank or water tank (m3). 3.2.4 Circulating cooling water should not be used for other purposes. 3.2.5 The layout of the circulating water field should avoid the downwind direction of the factory, and should be far away from main roads, coal yards, boilers, blast furnaces and other pollution sources. The ground around the cooling tower should be paved or vegetated. 3.2.6 The piping design of the intercooler open system shall meet the following requirements. 1 The return pipe of circulating cooling water shall be connected to the bypass pipe of the cooling tower pool, and the design capacity shall meet the requirements of system cleaning and pre-filming. 2 The circulating cooling water connection pipe of the heat exchange equipment shall be provided with a bypass pipe or a bypass pipe connection. 3 The supplementary water pipe diameter of the circulating cooling water system and the diameter of the pool drain water pipe should be determined according to the time requirements for draining, cleaning, and pre-membrane replacement, and the replacement time should not be greater than 8 hours. When the supplementary water pipe is equipped with a measuring instrument, a bypass pipe for large-flow replenishment of water when the system starts up should be installed. 4 The low point of the piping system shall be provided with a drain valve, and the high point shall be provided with an exhaust valve. 5 When the supplementary water has a tendency to corrode, the water delivery pipeline shall be made of corrosion-resistant materials. 3.2.7 The piping design of the closed system shall meet the following requirements. 1 Pipeline filters should be installed in the water supply main pipe of circulating cooling water and the water supply pipe of heat exchange equipment; 2 The low point of the piping system should be equipped with a drain valve, and the high point should be equipped with an exhaust valve; 3 When the make-up water has a tendency to corrode, the water delivery pipes shall be made of corrosion-resistant materials. 3.2.8 The cooling tower sump and the circulating water pump suction pool shall be equipped with facilities to facilitate the removal or removal of silt; the water outlet of the cooling tower pool or the circulating cooling water pump suction pool shall be equipped with a dirt-blocking filter for easy cleaning, and the dirt-blocking filter should be installed Two ways. 3.3 Scale and corrosion inhibition treatment 3.3.1 The scale and corrosion inhibitor formulation for circulating cooling water should be determined through dynamic simulation tests and technical and economic comparisons, or based on plant operation experience with similar water quality and working conditions. The dynamic simulation test shall be carried out in combination with the following factors. 1 Supplementary water quality; 2 Dirt thermal resistance value; 3 adhesion rate; 4 Corrosion rate; 5 Concentration times; 6 Material of heat exchange equipment; 7 The side wall temperature of the cooling water on the heat transfer surface of the heat exchange equipment; 8 The water flow rate in the heat exchange equipment; 9 circulating cooling water temperature; 10 The stability of the medicament and its impact on the environment. 3.3.2 Scale and corrosion inhibitors should choose environmentally friendly water treatment chemicals with high efficiency, low toxicity, chemical stability and good compound performance. When adopting the formula containing zinc salt, the content of zinc salt in circulating cooling water should be less than 2.0mg/L (calculated as Zn2). Phosphate-free chemicals should be used for scale and corrosion inhibitor formulations. 3.3.3 When there is copper alloy heat exchange equipment in the circulating cooling water system, the water treatment agent formula should contain copper corrosion inhibitor. 3.3.4 When the closed system is equipped with side-stream mixed anion-cation exchangers, water treatment chemicals that affect resin regeneration should not be added. 3.3.5 The initial dosage of scale and corrosion inhibitors in the circulating cooling water system can be calculated according to the following formula. In the formula. Gf——dosing amount for the first time (kg); g—dosage per liter of circulating cooling water (mg/L). 3.3.6 When the circulating cooling water system is in operation, the dosage calculation of scale and corrosion inhibitors shall comply with the following regulations. 1 Intercooling open and direct cooling systems can be calculated as follows. In the formula. Gr—dosage amount when the system is running (kg/h). 2 The closed system can be calculated according to the following formula. 3.3.7 When circulating cooling water is treated with sulfuric acid, the dosage of sulfuric acid can be calculated as follows. In the formula. Ac——dosing amount of sulfuric acid (kg/h, purity 98%); Mm—Alkalinity of supplemented water (mg/L, calculated as CaCO3); Mr - control alkalinity of circulating ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 50050-2017_English be delivered?Answer: Upon your order, we will start to translate GB/T 50050-2017_English as soon as possible, and keep you informed of the progress. The lead time is typically 6 ~ 10 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 50050-2017_English with my colleagues?Answer: Yes. 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