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Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. DL/T 2028-2019: Directive for chemical cleaning of membrane equipment for water treatment in power plant Status: Valid
Basic dataStandard ID: DL/T 2028-2019 (DL/T2028-2019)Description (Translated English): Directive for chemical cleaning of membrane equipment for water treatment in power plant Sector / Industry: Electricity & Power Industry Standard (Recommended) Classification of Chinese Standard: F23 Classification of International Standard: 27.100 Word Count Estimation: 9,949 Date of Issue: 2019-06-04 Date of Implementation: 2019-10-01 Quoted Standard: GB/T 6904; GB 8978; GB/T 12151 Issuing agency(ies): National Energy Administration Summary: This standard specifies the technical requirements, quality indicators and test methods for chemical cleaning of ultrafiltration and reverse osmosis membrane equipment for water treatment in power plants. This standard applies to the chemical cleaning of hollow fiber ultrafiltration membranes and rolled reverse osmosis composite membranes for water treatment in power plants. DL/T 2028-2019: Directive for chemical cleaning of membrane equipment for water treatment in power plant---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. Directive for chemical cleaning of membrane equipment for water treatment in power plant ICS 27.100 F 23 Record number. 63143-2018 People's Republic of China Electric Power Industry Standard Guidelines for chemical cleaning of membrane equipment for water treatment in power plants 2019-06-04 released 2019-10-01 implementation Issued by National Energy Administration Table of contentsForeword...II 1 Scope...1 2 Normative references...1 3 General...1 4 Technical requirements...1 5 Determination of chemical cleaning process conditions...2 6 Chemical cleaning process...2 7 Chemical cleaning quality indicators...3 8 Chemical Supervision in Chemical Cleaning...4 Appendix A...5 Appendix B...7ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009 "Guidelines for Standardization Work Part 1.Standard Structure and Compilation". This standard was proposed by the China Electricity Council. This standard is under the jurisdiction of the Power Plant Chemical Standardization Technical Committee (DL/T C13). Drafting organizations of this standard. State Grid Hunan Electric Power Co., Ltd. Electric Power Research Institute, Datang Huayin Electric Power Co., Ltd., China University Tang Group Science and Technology Research Institute Co., Ltd. Northwest Electric Power Research Institute, State Grid Zhejiang Electric Power Co., Ltd. Electric Power Research Institute, Hunan Provincial Xiangdian Research Institute Co., Ltd. The main drafters of this standard. Liu Kai, Wei Jiaqiang, Cha Fanglin, Xu Song, Wu Junjie, Zhou Zhou, Wan Tao, Gong Shangkun, Chen Shaoyi, Wang Ling, Yuan Xinmin, Guo Xinru, Song Xiaoning, Huang Zhidan, Chen Xiangbin, Cao Qiuyang. This standard is formulated for the first time. The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of China Electricity Council (No. 2 Baiguang Road, Beijing) Number One, 100761) Guidelines for chemical cleaning of membrane equipment for water treatment in power plants1 ScopeThis standard specifies the technical requirements, quality indicators and test methods for the chemical cleaning of ultrafiltration and reverse osmosis membrane equipment for water treatment in power plants. This standard applies to the chemical cleaning of hollow fiber ultrafiltration membranes and roll-type reverse osmosis composite membranes for water treatment in power plants.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document. GB/T 6904 Determination of pH in industrial circulating cooling water and boiler water GB 8978 Integrated Wastewater Discharge Standard GB/T 12151 Boiler water and cooling water analysis method turbidity determination (formazin turbidity)3 General3.1 The chemical cleaning of membrane equipment for water treatment in power plants should develop a cleaning plan, which should include safety, environmental, and occupational health protection measures. And there are complete review and approval procedures; quality supervision should be carried out during the cleaning process; after the cleaning, the cleaning quality should be checked and accepted. 3.2 The cleaning unit shall provide technical and safety information and training for the personnel participating in the cleaning. 3.3 During the chemical cleaning process, the safety work regulations shall be followed, and environmental and occupational health and safety protection measures shall be implemented. 3.4 When the abnormal operation of membrane equipment leads to a decrease in water production, deterioration of effluent water quality or an increase in operating pressure difference, the reasons should be analyzed to determine whether to proceed Chemical cleaning. 3.5 Chemical cleaning should not cause irreparable damage such as oxidation, corrosion, mechanical scratches, etc. to membrane elements and auxiliary equipment. 3.6 When the membrane treatment equipment is out of service for a long time, it should be chemically cleaned before using the protective liquid for protection.4 Technical requirements4.1 Chemical cleaning conditions of ultrafiltration membrane equipment 4.1.1 After standardization of the operating data, the water production volume will be reduced by 15% or more from the initial operating water production volume. 4.1.2 After standardization of the operating data, the transmembrane pressure difference will increase by 0.05 MPa from the initial operating transmembrane pressure difference or reach the value specified by the membrane manufacturer. 4.2 Chemical cleaning conditions of reverse osmosis membrane equipment 4.2.1 After the standardization of the operating data, the water production volume decreased by 10% or more from the initial operating water production volume. 4.2.2 After standardization of the operating data, the pressure difference between the sections will increase by 15% or more than the initial operating section pressure difference or reach the value specified by the membrane manufacturer. 4.2.3 After the operation data is standardized, the desalination rate will be reduced by 10% or more from the initial operation desalination rate. 4.3 Before chemical cleaning, a chemical cleaning plan should be prepared according to the fouling, fouling and related test results of the membrane equipment. Chemical cleaning party The case shall comply with relevant standards and technical conditions of the membrane manufacturer. 4.4 Before chemical cleaning, the cleaning equipment should be isolated from other irrelevant equipment. 4.5 The preparation of cleaning agents should use the water produced by the equipment to be cleaned or demineralized water. The cleaning agent should be fully dissolved and mixed before entering the membrane module. 4.6 The chemical cleaning of membrane equipment should adopt a combination of multiple cleaning agents or alternate cleaning, and after cleaning each agent, the cleaning agent should be drained, and then the cleaning agent should be used. The washing equipment produces water or demineralizes water to flush the system clean. 4.7 After the chemical cleaning, the residual liquid and residue in the equipment should be removed, and the pipes such as the connecting pipes of thermal instruments and sampling pipes should be rinsed dry. net. 4.8 Waste liquid from chemical cleaning should be treated and discharged in accordance with GB 8978 and local environmental protection requirements.5 Determination of chemical cleaning process conditions5.1 The reference formula of the cleaning medium is shown in Table 1 and Table 2.Special cleaning agents recommended by the membrane manufacturer can also be used. 5.2 Cleaning parameters 5.2.1 The pH value, temperature, pressure and flow rate of the cleaning fluid should meet the technical regulations of the membrane manufacturer. 5.2.2 The pH value should be controlled within 2～3 during pickling and 10～12 during alkaline washing. It can be adjusted with ammonia, sodium hydroxide or hydrochloric acid. The pH of the lotion is within the specified range. 5.2.3 The temperature of the cleaning solution should be controlled at 30℃～35℃. 5.2.4 The cleaning pressure of ultrafiltration membrane equipment should be less than 0.3MPa; the cleaning pressure of reverse osmosis membrane equipment should be less than 0.4MPa. 5.3 The chemical cleaning of reverse osmosis membrane equipment can be divided into online chemical cleaning and offline chemical cleaning. On-line chemical cleaning should adopt segmented cleaning. When the membrane element is seriously blocked and its performance cannot be restored by the online chemical cleaning, the membrane element should be removed for offline chemical cleaning. 5.4 When two or more cleaning media are used for cleaning, the cleaning sequence should be determined through small-scale tests. 5.5 The design of the chemical cleaning system of membrane equipment should be determined according to the structural characteristics of the system and the on-site space. The reverse osmosis system should meet the requirements of segmented cleaning. begging. See Appendix A for the typical cleaning system diagram of ultrafiltration and reverse osmosis membrane equipment.6 Chemical cleaning process6.1 Preparation before cleaning 6.1.1 Before cleaning, a small test should be carried out to analyze the degree of contamination of the membrane elements and the types of pollutants, and determine the cleaning process based on the test results. 6.1.2 Check the cleaning system to ensure that the system is intact without leakage and all functions are normal. 6.1.3 The amount of storage and water supply should meet the water requirements for chemical cleaning and flushing. 6.1.4 Facilities for waste liquid treatment should be complete. 6.1.5 The quantity of chemicals for chemical cleaning meets the requirements and the quality inspection is qualified. See Appendix B for the quality requirements. 6.1.6 The testing equipment should pass verification or calibration and within the validity period, the testing and protective drugs have been prepared. 6.2 Chemical cleaning process 6.2.1 The chemical cleaning process steps should include. system water flushing and leak detection, preparation of cleaning liquid, injection of cleaning liquid, circulation, soaking, recirculation, Rinse with water. 6.2.2 System water flushing and leak detection. 6.2.2.1 Start the cleaning water pump and flush the membrane equipment with low-pressure open water to replace the water in the system. The flushing pressure should be less than 0.4MPa. 6.2.2.2 After the water flushing is finished, switch to the circulation mode, make sure that the pipeline is unblocked and there are no leaks, and stop the pump to empty the water in the system. 6.2.3 Preparation of cleaning solution. prepare cleaning solution in the cleaning water tank, and adjust the temperature and pH of the cleaning solution to the specified range. 6.2.4 Inject cleaning liquid. Inject cleaning liquid into the membrane element at a lower pressure and flow rate to exhaust the system air. 6.2.5 Loop 6.2.5.1 The cycle cleaning time should be 30min to 60min, and the cleaning fluid temperature should be stable. 6.2.5.2 When the reverse osmosis membrane equipment is cyclically cleaned, the cleaning pressure should be controlled during the cycle and there should be no obvious liquid backflow on the water-producing side. 6.2.5.3 During the cycle cleaning process of acid and alkaline agents, the pH value of the cleaning solution should be monitored. Replenish cleaning agent according to the change of pH value. 6.2.6 Soaking 6.2.6.1 The soaking time should be 60min～120min. 6.2.6.2 In order to maintain the temperature of the cleaning solution during the immersion process, low flow circulation or intermittent circulation can be used. 6.2.7 Recirculation 6.2.7.1 After the immersion is finished, perform cycle cleaning again at 1.0 to 1.5 times of the designed cleaning flow, and the time should be 30min to 60min. 6.2.7.2 Measure the pH value in the cleaning solution for 3 consecutive times and no longer change, and the recirculation cleaning ends. 6.2.8 Water rinse 6.2.8.1 For low-pressure flushing membrane elements and cleaning systems, the flushing temperature should not be lower than 20°C. 6.2.8.2 Rinse until the pH value of the drain is close to that of the rinse water, and the water rinse ends. 6.2.9 Air scrubbing may be added when cleaning the ultrafiltration membrane. The scrubbing pressure should meet the technical regulations of the membrane manufacturer.7 Chemical cleaning quality indicators7.1 After the ultrafiltration membrane equipment is cleaned, the water production volume should be restored to 90% or more of the initial operating water production volume, and the membrane pressure difference should not be higher than the initial operating permeability. The membrane pressure difference is 10%. 7.2 After the chemical cleaning of the reverse osmosis membrane equipment, the water production volume should be restored to 90% or more of the initial operating water production volume, and the operating pressure difference of each section should not be higher than The initial operating pressure difference is 10%, and the system desalination rate shall not be lower than the system desalination rate before cleaning.8 Chemical supervision in chemical cleaning8.1 Check and confirm the quantity and quality of chemicals for chemical cleaning before chemical cleaning. 8.2 During chemical cleaning, dosing and testing should be supervised, and important parameters such as medium concentration, pH value and temperature in the cleaning phase should be controlled. 8.3 The test items and requirements in the chemical cleaning process are shown in Table 3.Appendix A(Informative appendix) Typical cleaning system diagram of membrane equipment A.1 Ultrafiltration membrane equipment A.2 Reverse osmosis membrane equipment A typical cleaning system diagram of the first-stage and second-stage reverse osmosis membrane equipment is shown in Figure A.2.Appendix B(Normative appendix) Product quality standards for cleaning chemicals B.1 Quality standard of cleaning acid B.1.1 Industrial synthetic hydrochloric acid GB 320 B.1.2 Citric acid GB 8269 B.1.3 Oxalic acid for industrial use GB 1626 B.2 Quality standards for cleaning alkali B.2.1 Sodium hydroxide for industrial use GB 209 B.3 Quality standards of other drugs for cleaning B.3.1 Sodium hypochlorite GB 19106 B.3.2 Sodium dodecyl sulfonate QB/T 1429 B.3.3 Industrial sodium bisulfite HG/T 3814 B.3.4 Industrial sodium tripolyphosphate GB/T 9983 ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of DL/T 2028-2019_English be delivered?Answer: Upon your order, we will start to translate DL/T 2028-2019_English as soon as possible, and keep you informed of the progress. 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