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DL/T 951-2019: Guideline for the acceptance of reverse osmosis equipment for water treatment in power plant
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Guideline for the acceptance of reverse osmosis equipment for water treatment in power plant
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DL/T 951-2019
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| DL/T 951-2005 | English | 439 |
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Guide for the acceptance of reverse osmosis equipment for water treatment in fossil fuel power plant
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Basic data | Standard 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
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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 contents
Foreword...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...5
Foreword
This 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 plants
1 Scope
This 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 references
The 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 plants
3 Term
The 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 requirements
4.1 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 element
4 Operating pressure difference meets contract requirements
5 The water produced meets the contract requirements under the corresponding water temperature conditions
6 The meter indicates correctly, and the accuracy meets the contract requirements
7 Interlocking and protection meet contract requirements
8 The valve switch is flexible and the valve position status indication is correct; the electric valve motor runs smoothly, and the vibration and noise indicators meet the technical requirements of the electric valve
9 Noise meets the requirements of GB 12348
5.5.4 The energy recovery device should be kept under pressure of 1.25 times of pressure for at least 30 minutes, and the appearance should not be deformed, and the pressure should remain unchanged;
Under working pressure and rated flow, the effective energy conversion rate should not be less than 90%.
5.6 Water effluent indicators. The effluent quality of the reverse osmosis water treatment device shall meet the contract requirements.
6 Identification, packaging, transportation and storage
6.1 Product identification
The metal nameplate should be fixed at an obvious position of the reverse osmosis water treatment device. The production of the nameplate is carried out in accordance with GB/T 13306, and the nameplate should indicate the system
Manufacturing unit, product name, model, specification, manufacturing date, operating pressure, rated flow, etc.
6.2 Packaging
6.2.1 Reverse osmosis membrane elements are generally packaged in a single carton.
6.2.2 The reverse osmosis water treatment device should be packaged in accordance with the provisions of GB 191 and GB 6388.The instrument box and the protruding part should be wrapped with sponge,
Foam or other flexible packaging materials to avoid bumps during transportation. If necessary, temporarily fix internal loose parts to facilitate transportation.
It is necessary to clearly indicate the various information of the shipment and the signs of rainproof, handle with care, do not put it upside down, and do not press heavily.
6.2.3 When the equipment leaves the factory, the manufacturer shall provide complete technical documents, which shall be able to meet the requirements for equipment operation, maintenance, and overhaul.
It is required that the documents provided with the machine should be put in a waterproof bag and placed firmly on the device. The accompanying technical file should include the following.
a) Delivery list;
b) Instructions and operating instructions;
c) Quality certificate, inspection certificate. The quality certificate shall include the welding inspection report of the main pressure components, the material certificate, the water pressure
Test report, etc.; the inspection certificate shall include the inspection certificate of membrane modules or membrane elements and the factory quality inspection of important accessories such as supporting instruments and valves.
Inspection certificate.
d) General plan of equipment. The general drawing provided should be able to meet the needs of equipment maintenance and overhaul;
e) List of spare parts;
f) Other documents required by the user in the order contract.
6.3 Transportation
The transportation of the reverse osmosis water treatment device should be in accordance with the contract, and it should be handled with care to prevent collision, bumps, throwing, heavy pressure and freezing.
6.4 Storage
Storage of reverse osmosis water treatment equipment should be placed in a ventilated, dry and sheltered place. Membrane modules and membrane elements should be antifreeze, sun
And meet the manufacturer’s technical requirements for storage. For wet-packed reverse osmosis membrane elements, pay attention to the good sealing of the packaging bag.
Appendix A
(Informative appendix)
Calculation of desalination rate and recovery rate
A.1 Calculation of desalination rate
There are two calculation methods for the desalination rate of reverse osmosis water treatment equipment, one is calculated based on the salt content of the water, and the other is based on the water
The conductivity is calculated. In the field acceptance, the conductivity calculation method is generally used.
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