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Basic dataStandard ID: DL/T 951-2019 (DL/T951-2019)Description (Translated English): Guideline for the acceptance of reverse osmosis equipment for water treatment in power plant Sector / Industry: Electricity & Power Industry Standard (Recommended) Classification of Chinese Standard: F29 Classification of International Standard: 27.100 Word Count Estimation: 9,946 Date of Issue: 2019 Date of Implementation: 2019-10-01 Issuing agency(ies): National Energy Administration DL/T 951-2019: Guideline for the acceptance of reverse osmosis 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. Guideline for the acceptance of reverse osmosis equipment for water treatment in power plant ICS 27.103 F 29 People's Republic of China Electric Power Industry Standard Replace DL/T 951-2005 Guidelines for acceptance of reverse osmosis water treatment equipment in thermal 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 Terminology...1 4 Technical requirements...2 5 Inspection and acceptance method...3 6 Identification, packaging, transportation and storage...4 Appendix A (informative appendix) Calculation of desalination rate and recovery rate...5 A.1 Calculation of desalination rate...5 A.2 Calculation of recovery rate...5ForewordThis standard is compiled in accordance with the requirements of GB/T 1.1-2009 "Guidelines for Standardization Part 1.Standard Structure and Compilation". This standard replaces DL/T 951-2005 "Guidelines for Acceptance of Reverse Osmosis Water Treatment Equipment in Thermal Power Plants", and compared with DL/T 951-2005, except for The main technical changes besides the editorial modification are as follows. -Modified the scope of application of the standard (see 1,.2005 version 1); --Modified the normative reference documents (see 2,.2005 edition 2); -Modified terms and definitions (see 3,.2005 edition of 3); - Modified the requirements for the water production and desalination rate configuration of membrane elements (see 4.1.3, 4.3.2 of the.2005 edition); - Deleted the provisions on the maximum inlet pressure requirements for the initial operation of reverse osmosis (see 4.3.3 in the.2005 edition); --Modified the provisions of the security filter configuration requirements (see 4.1.4, see 4.4 in the.2005 edition); --- Added the requirements for the configuration of safety nets for reverse osmosis pressure vessels (see 4.1.6); --Modified the low-pressure flushing requirements when reverse osmosis is shut down (see 4.1.7, see 4.6 of the.2005 edition); -Modified the provisions of the configuration requirements for reverse osmosis pipelines (see 4.1.10, see 4.9 in the.2005 edition); -Deleted the provisions on the configuration requirements of reverse osmosis dosing facilities (see 4.11 in the.2005 edition); -Revised the requirements for materials for reverse osmosis pipelines and valves (see 4.2.3, see 5.3 in the.2005 edition); --- Increase the anti-corrosion requirements of reverse osmosis composite racks (see 4.2.5); -Modified the requirements for hydraulic test, flushing and loading and unloading space (see 4.4.1, see 7.3.1 and 7.3.3 of the.2005 edition); -Deleted the requirements of pipe connection and arrangement (see 7.3.5 of the.2005 edition); --- Added electrical safety assurance requirements (see 4.4.2); --- Increase the requirements of instrument range and accuracy (see 4.4.3); --Deleted the definition of delivery acceptance (see 10.1 of the.2005 edition); -Modified the performance parameters in Table 1 (see Table 1, see Table 1 in the.2005 edition); --- Added the performance requirements of energy recovery device (see 5.5.4); --- Added transport requirements for reverse osmosis water treatment equipment (see 6.3); -Modified the requirements for storage of reverse osmosis water treatment devices and membrane elements (see 6.4, see 14.1 in the.2005 edition). This standard was proposed by the China Electricity Council. This standard is under the jurisdiction and interpretation of the Power Plant Chemical Standardization Technical Committee. This standard was drafted. Xi’an Thermal Power Research Institute Co., Ltd. Shanghai Electric Power Institute State Grid Hunan Electric Power Co., Ltd. Electric Power Research Datang Huayin Power Co., Ltd. The main drafters of this standard. Li Yajuan, Wang Zhengjiang, Xu Zhen, Yang Baohong, Lu Jian, Zhou Zhen, Liu Kai, Cao Ruixue, Yu Yaohong, Hu Dalong, Wang Ling Huang Zhidan Chen Xiangbin This standard replaces DL/T 951-2005 "Guidelines for Acceptance of Reverse Osmosis Water Treatment Devices in Thermal Power Plants" from the date of implementation. 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) One, 100761). Guidelines for acceptance of reverse osmosis water treatment equipment in thermal power plants1 ScopeThis standard specifies the technical conditions and methods for acceptance of reverse osmosis water treatment devices in thermal power plants. This standard applies to the acceptance of reverse osmosis water treatment equipment used in thermal power plants. Refer to this standard for reverse osmosis water treatment devices for other purposes Quasi-acceptance.2 Normative referencesThe clauses in the following documents become clauses of this standard after being quoted in this standard. All dated reference documents, only dated The version applies to this document. For undated references, the latest version (including all amendments) applies to this document. GB 191 Packaging, Storage and Transportation Graphic Mark GB/T 5656 Technical Conditions of Centrifugal Pump (Class Ⅱ) GB 6388 Transport packaging receipt and delivery mark GB 12348 Environmental Noise Emission Standard at the Boundary of Industrial Enterprises GB/T 13306 signs GB/T.20103 Membrane separation technical terms GB 50171 Specification for construction and acceptance of panel, cabinet and secondary circuit connection of electrical installation engineering GB 50235 Construction Code for Industrial Metal Pipeline Engineering DL/T 543 Guidelines for quality acceptance of water treatment equipment for power plants DL 5068 Code for chemical design of power plants3 TermThe following terms and definitions defined in GB/T.20103 apply to this standard. 3.1 Spiral wound reverse osmosis membrane module One or several roll-type reverse osmosis membrane elements are connected in series according to certain technical requirements and assembled with a single reverse osmosis membrane shell. 3.2 Disk tube reverse osmosis membrane module It is composed of a disc tube diaphragm, a hydraulic deflector, an O-shaped rubber ring, a lip seal ring, a center rod and a pressure sleeve, which is used to handle high Membrane modules containing salt water. 3.3 Security filter cartridge filter The precision filtration equipment installed before the reverse osmosis body is used to filter the solid particles leaked by the pretreatment system to ensure the reverse osmosis membrane Security. 3.4 The common practice reverse osmosis equipment A reverse osmosis water treatment device using low-pressure reverse osmosis membranes, brackish water reverse osmosis membranes (including anti-fouling membranes) and other membrane elements. 3.5 The high pressure reverse osmosis equipment A reverse osmosis water treatment device using membrane elements such as seawater reverse osmosis membranes and dish-tube reverse osmosis membranes.4 Technical requirements4.1 Configuration requirements 4.1.1 The reverse osmosis water treatment device includes a complete set from the inlet flange of the security filter to the reverse osmosis fresh water outlet flange. Unit equipment. In addition, there is a reverse osmosis membrane chemical cleaning device and a reverse osmosis auxiliary dosing device. 4.1.2 The selection of reverse osmosis membrane elements should fully consider the water quality characteristics of the inlet water. When used in wastewater treatment, anti-pollution membranes should be used. 4.1.3 The selection of the type and quantity of reverse osmosis membrane elements should fully consider the influence of water temperature and the attenuation of membrane flux during use to ensure that the During use, it will not cause insufficient water production due to equipment design defects. a) The design value of the flux of the reverse osmosis membrane should not exceed the range of the flux of the corresponding model specified by the membrane manufacturer. b) The number of membrane elements should be able to ensure that the water production reaches the design value when running at the lowest design water temperature. When running at the highest design water temperature, The desalination rate reaches the design value. 4.1.4 The filtration accuracy of the security filter before the roll-type reverse osmosis membrane device is generally not less than 5μm. The filter accuracy of the safety filter is generally not less than 10μm, the pressure difference should not be higher than 0.05MPa, and the filter element replacement cycle should not be less than 3 months. 4.1.5 The inlet high-pressure protection interlock of the reverse osmosis body and the inlet low-pressure protection interlock of the high-pressure pump should be equipped, and there should be a place to prevent reverse osmosis water. A facility that forms an instant high-pressure impact on the reverse osmosis membrane when the treatment device is started. 4.1.6 The end of the pressure vessel for high-pressure reverse osmosis should be equipped with a safety net. 4.1.7 The reverse osmosis device should be equipped with an automatic low-pressure water flushing function during shutdown, and the flushing water should be reverse osmosis produced water. 4.1.8 A chemical cleaning device shall be equipped with the function of segmented cleaning. 4.1.9 The reverse osmosis water treatment device should be equipped with inlet water flow meter, fresh water flow meter, concentrated water flow meter, inlet water conductivity meter, and fresh water conductivity meter. Each section should be equipped with pressure gauges. If the inlet water has a heating device, an on-line temperature monitoring instrument for reverse osmosis inlet water should be installed (should have the above Limit alarm signal); if adding acid or alkali into the water, an online pH meter (should have an over-limit alarm signal) should be installed. If the pretreatment part is chlorinated or For other oxidizing fungicides, an online residual chlorine meter or ORP meter (should have an over-limit alarm signal) should be equipped to ensure the residual chlorine or ORP value of the influent Do not exceed the allowable value of the reverse osmosis membrane; add reducing agent to the reverse osmosis inlet water and interlock with the ORP data. Each instrument should select a suitable range to ensure Proof of test accuracy. 4.1.10 The fresh water pipeline of the reverse osmosis body shall be equipped with a blowdown valve and a bursting membrane. 4.1.11 Each reverse osmosis membrane module should be equipped with a fresh water sampling port and a sampling valve for failure analysis. 4.2 Material requirements for pipe fittings 4.2.1 The pipe material of the reverse osmosis water treatment device shall meet the requirements of DL/T 543. 4.2.2 The selection of materials for the reverse osmosis water treatment device shall meet the requirements of pressure rating and corrosion resistance. 4.2.3 The low-pressure part of the reverse osmosis water treatment device should adopt steel-plastic composite pipe fittings and valves; the high-pressure part should be based on the Cl- content of the influent. Use stainless steel pipe fittings and valves of corresponding corrosion resistance grade materials. 4.2.4 Teflon or other materials with equivalent performance should be used for the sealing material of the high pressure part. 4.2.5 The combination frame of the reverse osmosis device should be made of suitable materials and take anti-corrosion measures according to the environmental conditions. 4.3 Welding requirements 4.3.1 The welding of the reverse osmosis device shall be undertaken by the correspondingly qualified welder. 4.3.2 The appearance quality and non-destructive testing of the inner and outer surfaces of the weld shall meet the requirements of DL/T 543. 4.3.3 The welding of metal pipelines should be made by argon arc welding to reduce the spatter and welding slag residue inside the pipeline. 4.4 Assembly requirements 4.4.1 Process requirements a) The assembly accuracy of the internal components of the security filter should meet the relevant technical requirements of DL/T 543, and the installation of the filter element should be tight and water-resistant hit. b) The reverse osmosis membrane element should be visually inspected before installation. Defective membrane modules should not be used. The membrane housing, joints and sealing rings should be completed. Whole and no damage. c) The membrane element packaging bag with wet packaging has no breaks and no leakage of the protective liquid inside. d) Before the reverse osmosis membrane element is installed in the membrane shell, the reverse osmosis water treatment device should be subjected to hydraulic pressure test and thorough water flushing. Water rinse should After the water pressure test is qualified, the mechanical impurities should not remain in the system. e) When assembling roll-type reverse osmosis membrane elements, push the membrane elements into the membrane shell one by one for series connection, and ensure that each membrane element can support Insert it in place to avoid leakage due to improper connection. f) Leave no less than 1.5 times the length of a single membrane element on the side where the membrane element is loaded and unloaded. g) The arrangement of the concentrated water pipeline and the fresh water pipeline should not appear on both sides of the reverse osmosis membrane larger than allowed by the membrane manufacturer under any operating conditions. Reverse pressure difference. The design of the concentrated water pipeline should ensure that the highest membrane module will not be emptied when the reverse osmosis device is normally shut down. h) The arrangement of pipelines and valves should meet the requirements of operation and maintenance, and have reliable fixation and support. The pipeline installation should not have installation stress. The pipeline construction should meet the requirements of GB 50235. 4.4.2 Electrical requirements a) The electrical control cabinet should meet the requirements of GB 50171, the control cabinet should be easy to operate, and it should be installed in a ventilated, dry and close to the frame. Installed. b) The installation of various electrical connectors should be in good contact, and the operation panel, cabinet, machine, pump and related equipment should have safety protection measures to ensure Proof of electrical safety. 4.4.3 Instrument requirements a) The range and accuracy of the instruments and meters should meet the requirements of equipment performance and comply with relevant regulations. The interface must not have any leakage. b) The installation of the instrument shall meet the installation conditions required by each instrument, and the power cord and signal wire shall be protected and fixed with casing. c) The arrangement of instruments and corresponding pipelines shall be reliably fixed under the premise of meeting the technological requirements, and shall be convenient for observation, maintenance and repair. d) The instrument panel has clear and accurate nameplates, and all inlet and outlet holes have waterproof measures. e) The instrument panel has reliable grounding, the internal wiring is neat and beautiful, with terminal marking tubes. 5 Inspection and acceptance method. 5.1 Acceptance principle 5.1.1 The acceptance of reverse osmosis water treatment equipment should be carried out one by one in accordance with the order contract. 5.1.2 Items not clearly specified in the contract shall be inspected and accepted in accordance with this standard. 5.2 Factory inspection 5.2.1 The factory inspection of the high-pressure pump shall be carried out in accordance with GB/T 5656 or the enterprise standard of the manufacturer. 5.2.2 The factory inspection of the security filter and reverse osmosis body includes welding inspection, material inspection, dimensional inspection, hydraulic test, meter electrical Check etc. 5.2.3 The result of material inspection shall meet the technical requirements of 4.2 of this standard. 5.2.4 The result of welding inspection should meet the technical requirements of 4.3 of this standard. 5.2.5 The size inspection mainly includes the inspection of the positioning size, pipe diameter, and connection method of the external nozzle, which should meet the requirements of the order contract. 5.2.6 The reverse osmosis water treatment device shall pass the water pressure test before leaving the factory. 5.2.7 Instruments and electrical control equipment shall be inspected in accordance with the relevant clauses in 4.4 of this standard. 5.3 Delivery acceptance 5.3.1 Visual inspection. No part shall be defective, and the packaging and labeling shall be standardized and complete, and shall meet the requirements of 6.1 and 6.2 of this standard. 5.3.2 Check the model, specification, quantity and origin of each equipment and membrane module to meet the contract requirements or the requirements of 4.1 of this standard. skills requirement. 5.3.3 Material inspection and welding inspection. The result should meet the technical requirements of 4.2 and 4.3 of this standard. 5.3.4 Check the model and quantity of spare parts. The result should meet the contract requirements. 5.3.5 Random file inspection. The random documents shall meet the contract requirements and the requirements of 6.2 of this standard. 5.4 Performance test 5.4.1 Before the performance test, the inlet water should meet the water quality requirements of DL 5068 and reverse osmosis membrane modules. 5.4.2 The performance test is carried out after all the water treatment system equipment has been debugged and qualified, and it should be run for 168h under the rated output condition. 5.5 Performance Index 5.5.1 The flow rate and pressure difference of the security filter should reach the design value; the initial pressure difference of the new filter element is generally less than 0.05MPa. 5.5.2 The high-pressure pump should reach the rated flow under the design pressure; other indicators should meet the requirements of GB/T 5656 and the contract. 5.5.3 The performance parameters of the reverse osmosis body are shown in Table 1. Table 1 Performance parameters of reverse osmosis body Item performance parameters 1 The desalination rate meets the requirements of the contract, the desalination rate of the general roll-type reverse osmosis membrane module is not less than 95%, and the desalination rate of the disc tube type reverse osmosis membrane module is not less than 90% 2 The recovery rate meets the contract requirements. Surface water and groundwater should be controlled within 75%~85%, seawater should be controlled within 35%~55%, and other water sources should be determined according to the quality of influent water, pretreatment degree, and membrane element performance.3 The operating pressure meets the contract requirements and does not exceed the maximum operating pressure of the membrane element4 Operating pressure difference meets contract requirements5 The water produced meets the contract requirements under the corresponding water temperature conditions6 The meter ind...... |
