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DL/T 1962-2019: Technical regulations of construction and acceptance for low temperature multiple effect distillation
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Technical regulations of construction and acceptance for low temperature multiple effect distillation
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DL/T 1962-2019
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Basic data | Standard ID | DL/T 1962-2019 (DL/T1962-2019) | | Description (Translated English) | Technical regulations of construction and acceptance for low temperature multiple effect distillation | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F23 | | Classification of International Standard | 27.100 | | Word Count Estimation | 17,149 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Quoted Standard | GB 2894; GB 50205; GB 50727; DL/T 855; DL/T 1280; DL/T 1285; DL/T 5072; DL 5190.3; DL 5190.4; DL 5190.1; DL 5190.5; DL 5190.6; HG/T 20679; NB/T 47014; NB/T 47015; NB/T 47013.1��5 | | Issuing agency(ies) | National Energy Administration | | Summary | This standard specifies the technical requirements for construction and acceptance of low-temperature multi-effect distillation seawater desalination plant civil construction and steel structure, main equipment installation, pipeline and auxiliary process equipment, anti-corrosion, heat preservation and paint, test and acceptance. This standard is applicable to the construction and acceptance of low-temperature multi-effect distillation seawater desalination plants in the power industry that use water vapor as the source of water vapor, have steam thermal compressors or no steam thermal compressors, and have a daily water production capacity of 1000t to 100 OOOt per unit. Low-temperature multi-effect seawater desalination plants that exceed the daily water production range can be implemented by reference. | DL/T 1962-2019: Technical regulations of construction and acceptance for low temperature multiple effect distillation
---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.
(Technical requirements for construction acceptance of low-temperature multi-effect distillation desalination plant)
ICS 27.100
F 23
People's Republic of China Electric Power Industry Standard
Low-temperature multi-effect distillation seawater desalination device
Technical regulations for construction acceptance
Refractory materials for boilers in thermal power plants
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
Foreword...II
2 Scope...1
3 Normative references...1
4 Terminology...2
5 General...2
5.1 General provisions...2
5.2 Inspection and storage requirements for equipment and materials...3
6 Civil Engineering and Steel Structure...3
6.1 Civil construction requirements...3
6.2 Steel structure construction requirements...4
6.3 Acceptance requirements...5
7 Main equipment installation...5
7.1 General provisions...5
7.2 Evaporator installation requirements...5
7.3 Installation requirements for condenser and regenerator...7
7.4 Installation requirements for steam thermal compressor (TVC)...8
8 Piping and auxiliary process equipment...9
8.1 Pipeline installation requirements...9
8.2 Requirements for the installation of auxiliary process equipment...9
9 Anticorrosion, heat preservation and paint...10
9.1 Anti-corrosion requirements...10
9.2 Insulation requirements...10
9.3 Paint requirements...10
10 Test and acceptance...11
10.1 Evaporator water injection test requirements...11
10.2 Vacuum tightness test requirements...11
10.3 Cold spray test requirements...11
10.4 Complete set of trial operation and acceptance requirements...12
10.5 List of Acceptance Documents...12
Appendix A (informative appendix) evaporator water injection test...14
Appendix B (Informative Appendix) Vacuum Tightness Test...16
Foreword
This standard is in accordance with GB/T 1.1-2009 "Guidelines for Standardization Part 1.Standard Structure and Compilation"
Drafting of rules.
Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the Power Plant Steam Turbine Standardization Technical Committee.
This standard was drafted by. Shenhua Guohua (Beijing) Electric Power Research Institute Co., Ltd., Shenhua Hebei Guohua Cangdong Power Generation Co., Ltd.
Responsible company, Beijing Guodian Desheng Engineering Project Management Company, Shanghai University of Electric Power.
The main drafters of this standard. Yang Qingwei, Zhang Jianli, Ding Tao, Zhang Zhongmei, Peng Guangyi, Zhang Shi, Zhang Daquan, Liu Chun
Cheung.
This standard is issued for the first time.
The opinions or suggestions in the implementation of this standard are fed back to the Standardization Center of China Electricity Council (Beijing Baiguang
No. 1, Lu Er Tiao, 100761).
Technical Regulations for Construction Acceptance of Low Temperature Multi-effect Distillation Seawater Desalination Unit
1 Scope
This standard specifies the civil and steel structure, main equipment, pipelines and auxiliary equipment, protection
Technical requirements for construction and acceptance of corrosion, heat preservation and paint, test and acceptance.
This standard applies to the power industry using steam as the source of water vapor, with or without steam thermal compressor, single
Construction and acceptance of low-temperature multi-effect distilled seawater desalination equipment with daily water output of 1,000 tons to 100.000 tons. Exceed the daily water production
The range of low-temperature multi-effect seawater desalination devices can be implemented by reference.
2 Normative references
The 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 2894 Safety Signs and Guidelines for Their Use
GB 50205 Code for Construction Quality Acceptance of Steel Structure Engineering
GB 50727 Code for acceptance of construction quality of industrial equipment and pipeline anti-corrosion engineering
DL/T 855 Electric power infrastructure maintenance and storage regulations for thermal power equipment
DL/T 1280 Technical Regulations for Commissioning of Low Temperature Multi-effect Distillation Seawater Desalination Unit
DL/T 1285 Low-temperature multi-effect distillation seawater desalination unit technical conditions
DL/T 5072 Thermal power plant insulation paint design specification
DL/T 5190.1 Technical Code for Construction and Acceptance of Electric Power Construction Part 1.Civil Engineering
DL/T 5190.3 Technical Specification for Power Construction Construction Part 3.Steam Turbine Generator Set
DL 5190.4 Technical Specification for Power Construction Construction Part 4.Thermal Instrument and Control Device
DL/T 5190.5 Technical Specification for Power Construction Construction Part 5.Piping and System
DL/T 5190.6 Technical Specifications for Construction and Acceptance of Electric Power Construction Part 6.Water Treatment and Hydrogen Production Equipment
JB/T 4709 Pressure Vessel Welding Regulations
JB/T 47013.1～.5 Non-destructive testing of pressure equipment
HG/T 20679 chemical equipment and pipeline external anti-corrosion design regulations
NB/T 47014 welding procedure qualification for pressure equipment
3 Term
3.1
Low temperature multiple effect distillation (LT-MED)
Multi-effect distillation seawater desalination technology in which the maximum evaporation temperature of raw seawater is generally lower than 70℃. Its characteristic is to combine a series of
Horizontal tube falling film evaporator or vertical tube falling film evaporator are connected in series and divided into several effect groups, with a certain amount of steam input,
Through multiple evaporations and condensations, a seawater desalination technology with distilled water that is multiple times the amount of heated steam is obtained.
3.2
Evaporater
The evaporator is a container that keeps seawater at the boiling point under vacuum to produce distilled water.
3.3
Condenser
Multi-effect distillation device is used to condense the last-effect secondary steam.
3.4
Falling film condenser
A condenser in which cooling water flows through a gravity falling film outside the heat exchange tube and steam condenses in the heat exchange tube.
3.5
Make-up seawater
Sea water that enters the evaporator to produce fresh water.
3.6
Regenerator
A heat exchanger that extracts the secondary steam from the evaporator to preheat the material seawater.
3.7
Main equipment
The main heat exchange equipment of the low-temperature multi-effect distillation seawater desalination unit generally includes. evaporator, regenerator, condenser and steam
Steam Thermal Compressor (TVC).
4 General
4.1 General rules
4.1.1 Before the installation of the device, the construction unit shall submit the quality control manual and inspection and test plan to the construction unit. The content shall include
Including equipment technical documents, construction party approved standards, construction unit installation manual, specified inspection and test items.
4.1.2 The equipment and materials used in the construction of the device should have a product qualification certificate, and they can be used only after being qualified on site. Such as
When it is necessary to modify the design or adopt substitute equipment and materials, it shall be approved by the original design and manufacturing unit, go through the approval procedures, and set
Technical documents such as calculation change orders or substitute equipment and materials are attached to the acceptance form.
4.1.3 When equipment manufacturing defects are found, they should be dealt with in accordance with the contract. After treatment, they should be inspected again and installed after passing the inspection. Assume
Inspection and defect handling should be recorded and visa.
4.1.4 Equipment safety signs shall be implemented in accordance with GB 2894.Safety signs should be made of materials resistant to salt spray corrosion.
4.1.5 After the installation of the device is completed, there should be construction inspection and test records, and should comply with the equipment technical documents and engineering design regulations.
4.1.6 The construction acceptance of thermal instruments, control devices and electrical equipment not listed in this standard shall be carried out in accordance with DL/T 5190.4.
4.1.7 When this standard is inconsistent with the technical requirements of equipment manufacturers, the higher technical requirements shall be implemented.
4.2 Inspection and storage requirements for equipment and materials
4.2.1 The storage of equipment and materials shall be implemented in accordance with DL/T 855.
4.2.2 The unpacking of the equipment should be supervised and inspected by a representative of the supervisory unit on the spot and visas are required. The inspection content generally includes. equipment, spare parts
And the marking, quantity, and integrity of random materials. After unpacking and inspection, it should be sealed first, and the storage requirements should be in accordance with DL/T 1285
Relevant regulations are implemented.
4.2.3 The equipment and materials should be stored in different zones, and the stainless steel equipment and materials should be stored away from carbon steel equipment and materials.
4.2.4 The storage location of large equipment should be determined in accordance with the construction sequence and transportation conditions, and in accordance with the design regulations of the construction organization.
Times handling.
4.2.5 Construction materials should have qualification certificates and material certificates, and materials that do not conform to the certificates should be discarded.
4.2.6 If equipment or materials are found to have rust, frost crack, deterioration, damage and other defects during construction, the reasons should be analyzed and dealt with.
4.2.7 Paint, resin and other raw materials should be stored in accordance with the technical requirements of the supply, and should be stored in a warehouse equipped with air-conditioning devices.
5 Civil Engineering and Steel Structure
5.1 Civil construction requirements
5.1.1 The internal civil construction and acceptance of the seawater desalination device shall implement DL/T 5190.1 and meet the drawings and installation of the manufacturer
Description and other technical requirements.
5.1.2 Elevation, centerline, and anchor bolt holes related to the installation of reserved holes, embedded part foundations and main auxiliary equipment foundations
Important dimensions and tolerances such as location should meet the design requirements.
5.1.3 The elevation deviation and level deviation of the base plate of the evaporator shall meet the requirements of the manufacturer’s technical documents and shall not be less than
The following standards.
a) Elevation deviation of foundation bottom plate. -3mm/5mm;
b) The level deviation of the foundation floor. ±2mm.
5.1.4 The secondary grouting construction of the equipment foundation shall meet the following requirements.
a) Dust should be thoroughly removed before the second grouting;
b) Before grouting, it should be filled with water for 24 hours and fully wetted;
c) There should be no cavities under the bottom plate during grouting;
d) The new mortar should be kept under a damp cloth for at least 24h to solidify;
e) The installation quality control table should record the above inspection results;
f) The final tightening of the bolts should be completed after the grouting is completely cured;
g) If the thread extension length needs to be adjusted, mechanical methods should be adopted instead of flame cutting, and zinc-rich coating should be applied after adjustment.
The primer is used to prevent rust on the cut surface.
5.2 Steel structure construction requirements
5.2.1 The steel structure installation of seawater desalination equipment generally includes. evaporator steel support, maintenance platform, pipe gallery bridge, etc. Steel structure
The construction and acceptance shall comply with the requirements of GB 50205, and meet the technical requirements such as engineering design and equipment manufacturing drawings, installation instructions, etc.
begging.
5.2.2 Before installing the steel structure column, the foundation slab should be checked. The installation deviation should meet the design requirements. The inspection content should include the following
List items.
a) Coordinates;
b) Levelness;
c) Position of foundation bolts;
d) Flatness and positioning accuracy of the bottom plate.
5.2.3 The welding of steel structures shall meet the following requirements.
a) The welding procedure should be compiled and qualified before welding;
b) Welding shall be performed by qualified welders according to the approved welding procedure;
c) Remove welding slag from the weld. After the visual inspection is qualified, immediately use zinc-rich primer to paint the weld and heat-affected zone to prevent rust;
5.2.4 The bolt connection of steel structure shall meet the following requirements.
a) Before connecting the components, check whether the paint quality of the surface to be contacted is in good condition;
b) The threaded part of the bolt should extend the nut two to three snaps;
c) Friction type high-strength bolts (HSFG) should be tightened according to the manufacturer's instructions, and the tightening torque should be checked;
d) If the mating surface of the friction-type high-strength bolt (HSFG) connection joint is protected by a coating, a friction surface should be provided
Qualified report of anti-slip test; if coating protection is not used, after installation and bolt tightening are completed, the joints should be sealed and the sealing method
The law should be submitted to the supervisor for review, and the exposed unprotected surface should be treated and painted in accordance with paint specifications.
5.2.5 The grille installation of steel structure shall meet the following requirements.
a) The grid should be fixed with special fixtures, and should not be fixed with tack welding;
b) The grille shall be cut by mechanical methods, and the galvanized steel grille shall not be gas-cut. Zinc-rich primer should be applied to the cut after cutting
Line anti-rust treatment.
5.3 Acceptance requirements
5.3.1 The delivery of civil engineering foundation shall complete the following acceptance and submit inspection records.
a) Check the quality control documents of civil engineering, including the results of cement compressive strength test;
b) Measure basic coordinates and overall levelness;
c) Check the levelness of a single foundation surface;
d) Secondary grouting and anchor bolt inspection;
e) Settlement observation record, and complete pre-compression test and inspection when pre-compression construction is available.
5.3.2 Steel structure installation should complete the following acceptance and submit inspection records.
a) The level of the bottom plate;
b) Verticality, position and alignment of uprights or rods;
c) Horizontality of beams;
d) Install bottom plate grouting;
e) Visual inspection records of welds;
f) Bolt tightening inspection records;
g) Overall inspection records.
6 Main equipment installation
6.1 General provisions
6.1.1 Before the equipment is installed, the positions and dimensions of the support of the main equipment and each interface should be reviewed according to the construction drawings. The alloy steel should be
Hit the spectrum to confirm the material. Before lifting large equipment, visual inspection should be carried out on the bearing welds.
6.1.2 During equipment installation, if the previous process has not passed the inspection and acceptance, the next process shall not be carried out.
6.1.3 After installation of the equipment, before closing and before starting, inspection and cleaning should be carried out, and no debris should be left in the container.
6.1.4 The equipment installation quality record table and test report should be accompanied by a contract to complete the equipment installation according to the drawings, the manufacturer’s and the builder’s standards.
Grid requirements.
6.2 Evaporator installation requirements
The temporary support is supported on the shell or external reinforcement ribs to prevent deformation of the shell.
6.2.2 The construction measures for evaporator hoisting shall be implemented after being approved by the equipment manufacturer and construction party. It should be used when lifting
The angle between the lifting beam and the lifting rope should not be greater than 60°, and it is not allowed to lift directly on the cylinder to prevent damage to the equipment and the shell,
Internal parts are deformed.
6.2.3 When the evaporator is installed as a whole, the elevation deviation of each support should be checked, and the following requirements should be met.
a) Elevation deviation of adjacent supports. ±2mm
b) Elevation deviation between any supports. ±5mm.
6.2.4 For multi-effect evaporators with split effects or on-site assembly of modules, the shell group alignment should control the shell elevation deviation. Check steaming before installation
The factory alignment mark and elevation positioning datum of the generator module, and the elevation positioning datum set by the manufacturer on the evaporator shell, then
Measure with this datum; if there is no elevation positioning datum, it should be based on the evaporator support. The allowable deviation of elevation should meet the following requirements
begging.
a) The elevation deviation of the front and rear ends of each effect. ±2mm;
b) Elevation deviation between arbitrary positioning datums. ±5mm.
6.2.5 If the multi-effect evaporator is split-effect or the modules are assembled on site, the allowable deviation of the straightness of the shell pair should not be greater than the shell length
0.1% and not more than 20mm.
6.2.6 The installation of the support pad iron shall meet the following requirements.
a) The material and size of the pad iron should meet the design requirements;
b) The shape of the shim should be regular, and the edges should be straight without warping to ensure the stability of the equipment;
c) Check the installation of the shim after lightly fixing the bottom plate bolts. When hitting the side with a hand hammer, the shim should not be loose.
d) After the shim is installed and before the secondary grouting of the foundation, the joints of the side of each shim should be spot welded firmly.
6.2.7 The support installation should meet the following requirements.
a) The sliding support should move freely in the specified direction, and the surface of the support base should be smooth, free of dirt or anything that may affect sliding
defect. Check the position of the low-resistance sliding gasket of the sliding bearing against the drawings to ensure that the sliding plate is in direct contact;
b) When the sliding bearing adopts low-resistance sliding gaskets such as PTFE, check the quality of the gasket before installation to ensure that it does not exist
Defects that may increase friction. When welding, protective measures should be taken to ensure that the welding heat will not degrade the sliding surface of the gasket;
c) Before the fixed support and sliding support have passed the installation inspection, no hot debugging should be carried out.
6.2.8 If the evaporator module is connected by welding, the welding construction and acceptance shall be carried out in accordance with NB/T 47014, JB/T 4709, NB/T
According to the provisions of 47013.1~.5, the gap and the amount of misalignment of the joint weld seam should meet the requirements of the equipment manufacturer’s technical documents and comply with
Meet the following requirements.
a) The welder shall obtain the certificate of the corresponding steel type, group and test piece classification code, and perform welding in accordance with the scope of the certificate. no
The destructive testing shall be performed by the qualified personnel of the boiler and pressure vessel non-destructive testing qualification certificate. According to NB/T 47014 before welding
Qualify welding procedures and formulate welding procedure specifications;
b) The welding groove preparation of the stainless steel shell should use mechanical methods. Hot processing welding groove should be ground groove and its base material
At least 20mm on both sides of the area, polish away the oxide scale to expose the base material. There shall be no defects such as cracks, delamination, inclusions, etc. on the groove surface;
c) When welding the composite steel plate shell, the last multi-layer weld is strictly prohibited before inspection, and should be avoided
Sew.
d) On-site assembly welds of the shell shall be subjected to no less than 10% radiographic inspection according to the provisions of NB/T 47013, and the qualification standard is level III.
Or not less than 20% ultrasonic inspection, qualified standard Ⅱ, the inner weld should also be 100% colored inspection according to NB/T 47013
Qualified standard level I; on-site welded shell and support welds should be 100% magnetic particle inspection inspection, qualified standard level I;
e) Welding process inspection reveals that there are problems with welders, welding consumables, welding methods, etc., and 100% shots should be used for the completed welds.
Wire inspection, fillet welding or lap welding shall be 100% inspected by other non-destructive testing methods. When the weld geometry is inconvenient to check,
The weld should be completely re-welded;
f) The repair of important structures, corrosion-resistant parts and pressure-bearing parts, etc. shall be recorded in the quality record sheet. Weld defect repair
The inspection, equipment technical documents or construction unit has no clear regulations, and should meet the following requirements.
1) For butt joints that have undergone radiographic inspection, if there are any impermissible defects, they should be repaired after the defects are completely removed, and
Re-check with the original method until it is qualified;
2) For butt joints of local flaw detection, if any impermissible defects are found, the extensions at both ends of the defect should be added
Plus check the length of the joint 10%, and not less than 250mm. If there are still impermissible defects, 100% inspection shall be carried out;
3) Penetration inspection shall include 150mm on both sides of the defect.
6.2.9 For the welding of shells in contact with seawater, the seawater corrosion resistance of the welded joints shall be ensured. The welds on the seawater-contacting side shall be welded last.
Stainless steel shell welds and heat-affected zones should be pickled and passivated according to the requirements of the equipment manufacturer. Stainless steel weld grinding and cleaning should be consistent
Meet the following requirements.
a) Fine-grained grinding wheels should be used for grinding, and the key parts can be polished;
b) Stainless steel wire brushes should be used for surface cleaning.
6.2.10 When operating inside the evaporator, the construction personnel should wear soft-soled shoes, and the scaffolding column feet should be covered with soft rubber. During installation
Take measures to protect the original passivation surface of stainless steel, prevent welding spatter from sticking, bumps and scratches, and the surface of the stainless steel shell
Defects such as local scars and grooves should be ground and passivated again.
6.2.11 The installation of heat exchange tubes shall take protective measures to prevent foreign matter from entering. Fire prevention measures should be taken for titanium pipes. Install heat exchange tubes on site
It is strictly forbidden to directly grasp the heat exchange tube by hand, and degreasing gloves must be used when wearing the expanded tube.
6.2.12 Internal parts such as sprinklers, demisters, and windows installed on site shall be fixed firmly, and the inspection results shall be recorded in the inspection record sheet.
6.2.13 When installing the evaporator with flange connection, the vacuum flange connection should be evenly tightened, and the fixed distance pipe or fixed distance table bonding room
The gap meets the technical...
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