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DL/T 1997-2019: Cellular wet electrostatic precipitator
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Cellular wet electrostatic precipitator
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DL/T 1997-2019
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Basic data | Standard ID | DL/T 1997-2019 (DL/T1997-2019) | | Description (Translated English) | Cellular wet electrostatic precipitator | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | J98 | | Classification of International Standard | 27.100 | | Word Count Estimation | 11,191 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Quoted Standard | GB/T 191; GB/T 3797; GB 4053.1; GB 4053.2; GB 4053.3; GB/T 6388; GB/T 13306; GB/T 13384; GB/T 13931; GB/T 16157; GB/T 21508; GB 50009; GB 50017; GB 50054; GB 50217; DL/T 461; DL/T 514; DL/T 1520; DL/T 1844; DL/T 5153; DL/T 5390; JB/T 5908; JB/T 5913 | | Issuing agency(ies) | National Energy Administration | | Summary | This standard specifies the technical requirements to be followed in the application of honeycomb structure wet electrostatic precipitator (fog) device. This standard applies to coal-fired power plants. | DL/T 1997-2019: Cellular wet electrostatic precipitator---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.
Cellular wet electrostatic precipitator
ICS 27.100
J 98
Record number. 63143-2018
People's Republic of China Electric Power Industry Standard
Honeycomb structure wet electrostatic precipitator (mist)
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 Terms and definitions...2
4 Product classification and structure composition...2
5 Main technical parameters...3
6 Technical requirements...3
7 Test acceptance...7
8 Product inspection...8
9 Product Marking...8
10 Packaging, transportation and storage...9
Appendix A (informative appendix) design selection parameter table...10
Foreword
This 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".
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 Boiler Standardization Technical Committee (DL/T C08).
Drafting organizations of this standard. Xi'an Thermal Power Research Institute Co., Ltd., Jiangsu Xutang Power Generation Co., Ltd.
The main drafters of this standard. Nie Xiaofeng, Zhang Chao, Zhang Kai, Li Qiang, Wu Zhengwen, Li Qingzhi, Chen Jianying, Li Dongyang, Guo Bin, Liu Xi
Pu and Liu Yutian
This standard is issued for the first time.
The opinions or suggestions during the implementation of this standard are fed back to the Standardization Center of the China Electricity Council (Baiguang Road, Beijing
No. 100761).
Honeycomb structure wet electrostatic precipitator (mist)
1 Scope
This standard specifies the technical requirements to be followed during the application of the honeycomb structure wet electric dust collector (mist).
This standard applies to coal-fired power plants.
2 Normative references
The following documents are indispensable for the application of this standard. For dated reference documents, only the dated version applies to this standard.
For undated reference documents, the latest version (including all amendments) is applicable to this standard.
GB/T 191 Packaging, storage and transportation pictorial signs
GB/T 3797 electrical control equipment
GB 4053 Safety requirements for fixed steel ladders and platforms
GB/T 6388 Receipt and Delivery Marks for Transport Packaging
GB 7251 Low-voltage switchgear
GB/T 13306 signs
GB/T 13384 General technical conditions for packaging of mechanical and electrical products
GB/T 13931 Electrostatic precipitator performance measurement method
GB/T 16157 Determination of particulate matter in exhaust from stationary sources and sampling method of gaseous pollutants
GB/T 21508 Performance test method for coal-fired flue gas desulfurization equipment
GB 50009 Building structure load code
GB 50017 Steel Structure Design Code
GB 50054 Low Voltage Power Distribution Design Code
GB 50217 Power Engineering Cable Design Code
DL/T 461 Operation and maintenance guidelines for electric precipitators in coal-fired power plants
DL/T 514 Electric precipitator for coal-fired power plant
DL/T 1520 Technical Specification for Testing Fine Particulate Matter (PM2.5) in Flue Gas of Thermal Power Plant Gravimetric Method
DL/T 1844 Inspection specification for conductive glass fiber reinforced plastic anodes for wet electrostatic precipitator
DL/T 5153 Technical specification for auxiliary power design of thermal power plant
DL/T 5390 Technical Regulations for Lighting Design of Thermal Power Plants and Substations
JB/T 5908 Specification for sampling inspection, packaging, transportation and storage of main parts of electrostatic precipitator
JB/T 5913 Electrostatic precipitator cathode line
JB/T 11074 Constant current high voltage DC power supply for electric dust removal
HJ/T 48 Technical requirements for soot sampler
HJ836 Gravimetric method for determination of low-concentration particulate matter in waste gas from stationary sources
HG/T 2640 glass flake lining construction technical conditions
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Honeycomb structure wet electrostatic precipitator (fog) cellular wet electrostatic precipitator
The dust collector is arranged vertically in a honeycomb structure. It is applied to the working conditions of saturated wet flue gas after wet desulfurization, and the electric dust collector (mist) of the hydraulic dust removal method is adopted.
3.2
Dust collecting pole
The system unit that collects the charged dust and liquid droplets in the flue gas, also called the anode.
3.3
Discharge electrode
The system unit that charges dust and liquid droplets in the flue gas, also called the cathode.
3.4
Spray rinse device
The unit used to clean the dust collector and discharge electrode, including cleaning water pumps, pipelines, valves, filters, nozzles and other equipment.
3.5
Sewer system
The unit used to collect and remove the gray-water mixture collected by the equipment, including sewage collection hoppers, pipelines, valves and other equipment.
4 Product classification and structure
4.1 Product Classification
4.1.1 According to the layout, it can be divided into one-piece type and split type.
4.1.2 Integrated type refers to the arrangement in which the equipment is arranged on the upper part of the demister of the desulfurization absorption tower and integrated with the absorption tower.
4.1.3 Split type refers to the arrangement where the equipment is arranged outside the desulfurization absorption tower to form an independent device.
4.2 Structure composition
4.2.1 The wet electric dust collector (fog) is composed of mechanical equipment and electric control system.
4.2.2 Mechanical equipment includes shell, dust collector, discharge electrode, cleaning system, sewage system, hot air heating system and flow field distribution device.
4.2.3 The electrical control system includes electrical systems, control systems and measuring instruments.
5 Main technical parameters
5.1 The amount of flue gas (m3/h)
5.2 Flue gas temperature (℃)
5.3 Flue gas pressure (Pa)
5.4 Smoke and dust concentration at inlet and outlet (mg/m3)
5.5 Inlet and outlet droplet concentration (mg/m3)
5.6 Flue gas velocity (m/s)
5.7 Specific dust collection area (m2/(m3/s))
5.8 Dust removal efficiency (%)
5.9 Mist removal efficiency (%)
5.10 Body resistance (Pa)
5.11 Air leakage rate (%)
5.12 Equipment availability (%)
5.13 Life of the whole machine (years)
6 Technical requirements
6.1 General requirements
6.1.1 The layout method should be determined according to the site conditions, and the selection and design parameters refer to Appendix A.
6.1.2 The power supply area shall operate independently in different areas. 300MW units should be divided into 4 power supply areas, 600MW units should be divided into 4-6 power supply areas,
The 1000MW unit should be divided into 6-8 power supply areas.
6.1.3 The dust collector is arranged vertically in a honeycomb structure, and the discharge electrode should adopt an integral suspended structure.
6.1.4 The equipment should be equipped with a cleaning system, a sewage system and a heating system.
6.1.5 The dust collector, discharge electrode and accessories should be made of corrosion-resistant materials according to the flue gas conditions.
6.1.6 Equipment manholes, valves, instruments and other frequently operated parts should be equipped with maintenance platforms, and the design of platform escalators should meet the requirements of GB 4053.
6.1.7 A lifting device should be provided on the top of the shell.
6.1.8 Manhole doors should be equipped with safety interlocking devices.
6.1.9 The equipment is equipped with a safe and reliable power supply and control system.
6.2 Main technical requirements
6.2.1 Shell
6.2.1.1 The design should comply with the relevant regulations of GB 50009 and GB 50017.
6.2.1.2 The structural parts shall adopt metal structure, and the material requirements shall not be lower than Q235.
6.2.1.3 Rectangular steel should be used for the dust collector suspension beam, and the supporting nodes should be simplified as much as possible to facilitate corrosion protection.
6.2.1.4 The manufacturing quality should meet the relevant requirements of DL/T 514.
6.2.1.5 There should be an inspection space between the inner wall and the dust collecting electrode.
6.2.1.6 The inner wall should be made of glass flakes for anti-corrosion, and the anti-corrosion should meet the requirements of HG/T 2640.The outer wall can be insulated according to the use environment temperature.
6.2.2 Dust collector
6.2.2.1 Non-metallic conductive materials or other corrosion-resistant alloy materials that are resistant to acid and chloride ion corrosion should be used.
6.2.3.2 The non-metallic conductive dust collector can be manufactured by pultrusion or hand lay-up, and the physical and chemical properties of the product should meet the requirements of DL/T 1844
related requirements.
6.2.2.3 The section should be a polygon with an inscribed circle diameter (Φ300mm～Φ400mm), the limit deviation of the inscribed circle is ±3 mm, non-metallic
The thickness of one side of the dust collecting pole tube is ≥3mm.
6.2.2.4 The effective length should be 4500mm～6000mm, and the length limit deviation should be ±10mm.
6.2.2.5 The integral structure shall be adopted, without splicing, the inner surface is smooth, smooth, and without damaging scratches, and the inner surface flatness tolerance is 1mm;
Surface roughness Ra< 12.5.
6.2.2.6 The design should be modular, and the specifications of each module should be unified.
6.2.2.7 Measures should be taken to prevent short-circuit of the flue gas, and should be sealed with the shell at the upper and lower flanges.
6.2.2.8 A safe and reliable grounding system should be designed between the module and the housing, and a grounding point should be set up and down each power supply area.
6.2.3 Discharge electrode
6.2.3.1 The structural design should adopt a sub-chamber integral suspension structure, and a fixed device to prevent swing shall be provided, and the swing amplitude shall not exceed ±5mm.
6.2.3.2 Titanium alloys with excellent electrical conductivity, acid resistance and chloride ion corrosion resistance or materials with the same properties shall be used.
6.2.3.3 A type with low corona initiation voltage, uniform discharge, and less dust accumulation shall be adopted.
6.2.3.4 It should be an overall structure, and the manufacturing quality of the cathode wire meets the relevant requirements of JB/T 5913.
6.2.3.5 Suspension rods and suspension beams should be made of Q235 coated FRP anticorrosion or 2205 duplex stainless steel or materials with equivalent performance.
6.2.3.6 The top high-voltage insulation box and the lower holder must be equipped with anti-condensation and scaling measures, and hot air heating and sealing methods should be adopted.
6.2.3.7 All connecting bolts must be made of 2205 duplex stainless steel and a metal material with the same corrosion resistance. Non-metallic materials must not be used.
6.2.4 Cleaning system
6.2.4.1 Neutral water from the plant area can be used as the cleaning water source, and the water quality should be consistent with the desulfurization process water (PH value 6-8, suspended solids ≤ 150mg/L),
The cleaning water pressure should be 0.3MPa～0.5MPa.
6.2.4.2 The setting of the cleaning system should match the power supply area, and the cleaning time and cleaning water volume of each power supply area are adjustable.
6.2.4.3 The cleaning system should be interlocked with the high-voltage power supply device. During the cleaning process, the electric field can be automatically stepped down to avoid electric field flashover and breakdown.
6.2.4.4 The internal cleaning piping of the equipment should be made of corrosion-resistant materials, and the flange connection bolts should be made of 2205 duplex stainless steel or materials with equivalent performance.
quality.
6.2.4.5 The water supply pipeline should be equipped with a filter device.
6.2.4.6 The water supply pipeline should be equipped with automatic drain valve, heat preservation and heat tracing device according to the ambient temperature.
6.2.4.7 A stop valve should be installed at the end of the water supply pipeline.
6.2.4.8 The cleaning nozzle should be a solid atomized nozzle, which has anti-rust and anti-clogging functions. Control spray angle should be 55°～70°, single
The nozzle flow rate is not less than 50L/min.
6.2.4.9 The cleaning nozzles should be reasonably arranged in combination with the flow field. The coverage area of a single nozzle is not less than 1m2, and the cleaning area coverage of adjacent nozzles is not
Less than 150%.
6.2.4.10 The cleaning nozzle material can be made of corrosion-resistant non-metallic material, 2205 duplex stainless steel or metal material with equivalent performance.
6.2.5 Sewage system
6.2.5.1 The material of the sewage collection bucket should not be less than Q235, and the taper should not be less than 15°.
6.2.5.2 The inner wall of the sewage collection hopper shall be anticorrosive with glass flakes, and the outer wall can be insulated according to the ambient temperature.
6.2.5.3 The sewage pipe shall be led out from the lowest point of the sewage collecting bucket, and a shut-off valve should be installed. The horizontal pipe section shall have a slope of 2º～3º.
6.2.5.4 The diameter of the sewage pipe should not be less than 100mm, and the sewage pipe should be made of corrosion-resistant material.
6.2.5.5 Under the premise of ensuring the balance of desulfurization water, the sewage can be discharged into the wet desulfurization system, and the sewage pipe should be equipped with a water sealing device at the entrance of the pit.
6.2.5.6 When the discharged sewage cannot be directly discharged into the desulfurization system, a water storage tank (pool) shall be installed, and the discharged sewage can be recycled after treatment.
6.2.5.7 The pipeline of the sewage system shall be insulated according to the environmental conditions.
6.2.6 Heating system
6.2.6.1 The heating temperature of the hot air in the high-voltage insulation box and the holder can be adjusted according to changes in the ambient temperature and working conditions, and the control temperature range is 60℃～100
℃.
6.2.6.2 The design and selection of the sealed fan should be considered in combination with the operating conditions, and the pressure in the high-voltage insulation box and the holder should be higher than that of the flue gas.
The pressure is 50Pa～100Pa.
6.2.6.3 The configuration of sealed fans should not be less than two, one for use and one for backup.
6.2.6.4 The hot air pipes of the high-voltage insulation box and the holder should be arranged in layers. The hot air pipes of each layer should be arranged in parallel according to the power supply area.
The difference should not exceed 15%.
6.2.6.5 There should not be a 90º right-angle elbow on the hot air pipeline, and the excessively large and small cross-sections should be smooth, and there should be no sudden cross-sections to reduce the system resistance.
6.2.6.6 The lowest point of the hot air pipeline shall be provided with a water drain valve, and the end of the hot air pipeline shall be provided with a gate valve.
6.2.6.7 Steam heat exchangers should be used as heat exchangers, and electric heaters can be used when there is no steam source.
6.2.6.8 In cold areas, an electric heater can be added to the high-voltage insulation box and the holder at the same time.
6.2.6.9 The hot air pipeline should be equipped with heat preservation.
6.2.7 Flow field distribution device
6.2.7 1 The flow field distribution device includes the diversion device in the flue and the inlet flow equalization device, which should be set reasonably according to the flow field simulation results.
6.2.7.2 The flue gas flow deviation of each electric field zone shall be less than 10%.
6.2.7.3 The relative root-mean-square value of the airflow uniformity coefficient at the entrance of the electric field σ≤0.25.
6.2.7.4 The flow-sharing and diversion devices shall be made of corrosion-resistant materials.
6.2.7.5 The cleaning system of the current sharing device can be set according to the situation, and the cleaning control mode is adjustable.
6.3 Electrical and control system
6.3.1 Electrical system
6.3.1.1 Constant current power supply or high frequency constant current power supply should be selected for high-voltage DC power supply. The design, manufacture and inspection of constant current power supply should comply with JB/T 11074
Provisions.
6.3.1.2 When the same pole distance is 300mm, the secondary voltage level is 60kV, and when the same pole distance is 350mm～400mm, the secondary voltage level is 72kV.
6.3.1.3 The board current density selection range is 0.45mA/m2～0.5mA/m2.
6.3.1.4 The power supply system shall comply with DL/T 5153.
6.3.1.5 The selection of electrical equipment should be consistent with the main project, and should meet the requirements of GB 7251.
6.3.1.6 The design of low-voltage power distribution system shall meet the requirements of GB 50054.
6.3.1.7 The design and selection of cables shall comply with the requirements of GB 50217.
6.3.1.8 The lighting system design should comply with DL/T 5390.
6.3.1.9 The equipment grounding point should not be less than 4 points, the grounding resistance should be less than 1Ω, and it should be connected to the main grid of the power plant.
6.3.2 Control system
6.3.2.1 It shall be compatible with the main engineering control system of the unit, and the control level shall be coordinated with the control level of the unit.
6.3.2.2 Use programmable logic control system (PLC) or distributed control system (DCS).
6.3.2.3 The start and stop of the equipment shall not affect the normal operation of the unit.
6.3.2.4 The control system should have complete equipment status monitoring, operation start and stop, and alarm interlocking functions. The parameters are as follows.
a) Monitoring display parameters include. high-voltage power supply parameters (primary current, primary voltage, secondary current, secondary voltage), temperature parameters (absolute
Edge box, holder, inlet and outlet measuring points), pressure/pressure difference parameters (insulating box, holder, inlet and outlet measuring points), fan heating device
Parameters (temperature, fan current), cleaning water pump device parameters (flow, current), etc.
b) Operation control parameters include. high-voltage power supply control (start, stop), fan heating device control (start, stop), spray water pump installation
Set control (start, stop), spray valve control (open, close).
c) Alarm parameters include. high-voltage power supply failure alarm, flushing water pump failure alarm, fan heating device failure and over-temperature alarm, valve failure
Alarm etc.
6.3.2.5 The selection of electrical control equipment shall meet the requirements of GB/T 3797.
6.3.2.6 Important thermal measuring instruments should be set up redundantly.
7 Test acceptance
7.1 No-load boost test
7.1.1 The insulation box and the holder must be tested for the hot air heating system, and the heating performance should meet the design requirements.
7.1.2 The high-voltage power supply must be subjected to insulation test, short circuit test (constant current source)/open circuit test (voltage source), which shall meet the design requirements.
7.1.3 The insulation resistance test should be carried out in the power supply load area, and the insulation resistance of each power supply area should be greater than.200MΩ.
7.1.4 The output voltage of the high-voltage power supply during no-load test shall not be less than 50kV, or the secondary current shall reach the rated value.
7.1.5 The cleaning system shall be subjected to manual/automatic tests, and the control shall meet the design requirements.
7.1.6 After meeting the requirements of (7.1.1～7.1.5), the no-load boost test shall be carried out after the water spray cleaning is completed, the voltage shall be increased step by step, and the record table
The primary and secondary voltage and current values indicated by the panel.
7.1.7 When the no-load pressure rise test is carried out at altitudes higher than 1000m, atmospheric pressure correction shall be carried out. For every 100m increase in altitude, secondary voltage
The value can be reduced by 1%.
7.2 Flow field uniformity test
7.2.1 The airflow uniformity coefficient at the entrance of the electric field shall be implemented in accordance with Table 3 and meet the requirements of DL/T 461.
7.2.2 The uniform distribution of the flow field can be verified by numerical simulation calculation or physical model test.
7.2.3 The simulation calculation range of the split structure should include the exhaust flue range of the desulfurization absorption tower; the simulation calculation range of the integrated structure should include the desulfurization
Range of flue at the entrance of absorption tower.
7.2.4 Solve the problem of inlet flow deviation by optimizing and adjusting the flow field. The relative flow deviation of the inlet of each chamber of the electric field should be less than 10%.
7.3 Performance test
7.3.1 Test content
7.3.1.1 Smoke emission concentration
7.3.1.2 Dust removal efficiency
7.3.1.3 Resistance
7.3.1.4 Air leakage rate
7.3.1.5 Running power consumption
7.3.1.6 Running water consumption
7.3.1.7 Noise
7.3.1.8 PM2.5, PM10, fog drop, SO3, etc. can be tested according to project requirements
7.3.2 Layout of measuring points
7.3.2.1 The arrangement of measuring points shall meet the relevant requirements of GB/T 16157.
7.3.2.2 The flow field uniformity coefficient of the test section shall be less than 0.25.
7.3.2.3 The test location shall have stairs and platforms.
7.3.2.4 The inner diameter of the sampling hole should not be less than 90mm, and the sampling hole with an inner diameter of 90mm～120mm should be selected.
7.3.3 Test equipment
7.3.3.1 The test instrument shall meet the relevant requirements of GB/T 16157 and HJ/T 48 and have the function of air tightness inspection.
7.3.3.2 The sampling device shall be made of corrosion-resistant materials, and shall have a heating function. The heating temperature shall be adjustable from 60°C to 120°C.
7.3.3.3 The smoke and dust test shall adopt the combined sampling head integral weighing method.
7.3.3.4 The filter membrane should be made of quartz or polytetrafluoroethylene.
7.3.4 Test method
7.3.4.1 The smoke and dust test method shall meet the relevant requirements of HJ836, GB/T 16157 and GB/T 13931.
7.3.4.2 The effective sampling number of the smoke and dust test shall not be less than 5 groups.
7.3.4.3 The fog drop and SO3 test meet the relevant requirements of GB/T 21508.
7.3.4.4 PM2.5 and PM10 tests shall meet the relevant requirements of DL/T 1520 and GB/T 16157.
7.3.4.5 The analysis of smoke and dust samples shall meet the relevant requirements of HJ836, GB/T 16157, and GB/T 13931.
8 Product inspection
8.1 Factory inspection
The factory inspection is carried out in accordance with the requirements of the relevant standards of each equipment.
8.2 Transportation inspection
The transportation inspection is jointly responsible by the installation unit and the manufacturing unit, and the inspection shall be carried out according to the construction drawing and the shipping list.
9 Product mark
9.1 Nameplate mark
The type and size of the product nameplate should meet the requirements of GB/T 13306, and be fixed in a prominent position of the equipment, mainly including the following.
a) Product name
b) Performance parameters. processed flue gas volume, specific dust collection area, power supply area, power supply specifications, smoke emission concentration
c) Factory number
d) Name of manufacturer
e) Production date
9.2 Packaging mark
9.2.1 The packaging signs should include the receipt and delivery signs, and the packaging, storage and transportation pictorial signs, and should comply with GB/T 191 and GB/T 6388.
9.2.2 The packaging of electronic control equipment, dust collector, cathode frame, insulating porcelain bottle, etc. should be marked with the words "fireproof, moisture-proof, pressure-proof, and handle with care".
10 Packaging, transportation and storage
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