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DL/T 387-2019: Guideline of flue gas bag filter selection for thermal power plants
Status: Valid DL/T 387: Evolution and historical versions
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Guideline of flue gas bag filter selection for thermal power plants
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Basic data | Standard ID | DL/T 387-2019 (DL/T387-2019) | | Description (Translated English) | Guideline of flue gas bag filter selection for thermal power plants | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F23 | | Classification of International Standard | 27.100 | | Word Count Estimation | 17,193 | | Date of Issue | 2019 | | Date of Implementation | 2019-10-01 | | Issuing agency(ies) | National Energy Administration | DL/T 387-2019: Guideline of flue gas bag filter selection for thermal power plants---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 of flue gas bag filter selection for thermal power plants
ICS 27.100
F 23
People's Republic of China Electric Power Industry Standard
Replace DL/T 387-2010
Selection guide for flue gas bag filter in thermal power plant
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...1
4 Basic parameters of bag filter selection...3
5 Main technical parameters of bag filter...3
6 The composition of the bag filter...4
7 Choice of body structure...4
8 Selection of dust collector filter bag...5
9 Selection of filter bag frame for dust collector...6
10 Selection of air source for cleaning dust...7
11 Selection of Pulse Valve...7
12 Selection of supporting process system for dust collector...7
13 Electrical Selection of Dust Collector...7
14 Selection of dust collector control system...8
15 Energy consumption index of dust collector...8
Appendix A (informative appendix) Basic parameters of bag filter selection...9
Appendix B (Normative appendix) Gas parameters of bag filter selection...12
Appendix C (informative appendix) Post-processing methods of filter media...13
Appendix D (informative appendix) Commonly used electrical panel types and technical characteristics...14
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces DL/T 387-2010 "Guidelines for the selection of flue gas bag dust collectors for thermal power plants", this standard and DL/T 387-2010
Compared with the main technical changes as follows.
--Additions, deletions and modifications to "Terms and Definitions";
--Added the flue gas parameters at the inlet of the dust collector, the main technical parameters of the bag filter, the composition of the bag filter, and the energy consumption of the dust collector
index;
--Adjusted the recommended value of air-to-cloth ratio, the body structure and its content, the selection of dust collector filter bags, the type and technology of electrical panels
Features;
-Canceled the comparison table of online and offline cleaning methods, the types and technical parameters of electrical components, and the bag filter
System cables and related technical parameters.
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the Electric Power Industry Environmental Protection Standardization Technical Committee.
Drafting organizations of this standard. Nanjing Longyuan Environmental Protection Co., Ltd., Guodian Research Institute of Science and Technology, Donghua University, Datang Environmental Industry Group
Group Co., Ltd., Fujian Longjing Environmental Protection Co., Ltd.
The main drafters of this standard. Yang Chuanbian, Li Rengang, Zhou Rui, Shen Zhiyong, Shen Henggen, Zhu Zhaoping, Li Zhitong, Li Zhiqiang, Liu
Yi, Liang Zhen, Deng Xiaodong, Xia Xinwei, Luo Yong, Yan Yanjiao, Ye Yike, Pan Yun, Wang Te, Shen Yunpeng, Zhang Yanting, You Yanqing.
The previous version of the standard replaced by this standard.
--DL/T 387-2010.
The opinions or suggestions during the implementation of this standard are fed back to the Standardization Management Center of the China Electricity Council (Baiguang Road, Beijing)
Two Article No. 1, 100761)
Selection guide for flue gas bag filter in thermal power plant
1 Scope
This standard specifies the technical requirements for the selection of flue gas bag filter and auxiliary equipment for thermal power plants.
This standard applies to the selection, inspection and acceptance of flue gas bag filter and auxiliary equipment in thermal power plants.
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
file. For undated references, the latest version (including all amendments) applies to this document.
GB/T 700 carbon structural steel
GB 4053.1 Safety requirements for fixed steel ladders and platforms Part 1.Steel straight ladders
GB 4053.2 Safety requirements for fixed steel ladders and platforms Part 2.Steel inclined ladders
GB 4053.3 Safety requirements for fixed steel ladders and platforms Part 3.Industrial protective railings and steel platforms
GB/T 33017.3 Technical requirements for evaluation of high-efficiency air pollutant control equipment-Part 3.Bag filter
GB 50017 Steel Structure Design Code
GB 50205 Code for Construction Quality Acceptance of Steel Structure Engineering
GB 50217 Power Engineering Cable Design Code
DL/T 659 Acceptance Test Procedure for Distributed Control System of Thermal Power Plant
DL/T 1121 Technical code for bag dust removal engineering of boiler flue gas in coal-fired power plant
DL/T 1175 Technical requirements for filter material filter bag of boiler flue gas bag filter in thermal power plant
DL/T 5041 Technical Regulations for In-plant Communication Design of Thermal Power Plants
DL/T 5044 Technical Specification for Design of DC Power Supply System in Power Engineering
DL/T 5072 Thermal power plant insulation paint design specification
DL/T 5153 Technical Specification for Auxiliary Power Design of Thermal Power Plant
HJ/T 325 Technical Requirements for Environmental Protection Products, Bag Filter Bag Frame
HJ/T 326 Technical Requirements for Environmental Protection Products Covered Filter Material for Bag Filter
JB/T 5916 Electromagnetic pulse valve for bag filter
JB/T 8471 Technical Requirements and Acceptance Specification for Installation of Bag Filter
JB/T 10191 Bag filter safety requirements for pulse jet bag filter air distribution box
3 Terms and definitions
The following terms and definitions apply to this standard
3.1
Bag filter
It is a device to capture and remove particulate matter in the flue gas using the interception and retention of the filter bag.
3.2
Pulse-jet bag filter
Compressed air is used as the driving force for dust removal, and the pulse blowing device is used to release compressed air in an instant, so that the filter bag can be produced by shock and vibration.
A bag filter with sharp deformation and reverse airflow for dust removal.
3.3
Rotation pulse-jet bag filter
Compressed air is used as the driving force for dust removal, and the elliptical filter bags arranged in concentric circles are pulsed to remove dust by using a rotary injection device.
The bag filter.
3.4
Specific power consumption
The amount of electricity consumed by the dust collector to process a unit of dust-containing flue gas, unit. kW•h/m3.
3.5
Compressive strength of casing
The maximum static pressure difference between the inside and outside of the dust collector housing within the allowable deformation range, in Pa.
3.6
Air leak percentage
The difference between the standard state gas flow at the outlet of the dust collector and the standard state gas flow at the inlet accounts for the amount of gas flow in the standard state at the inlet
Percentage, unit. %.
3.7
Air to cloth ratio
Under working conditions, the amount of dust-containing flue gas passing per unit time and unit filter area of the filter bag, unit. m3/(m2·min).
3.8
Bag filter tube sheet
Perforated steel plate located between the clean air chamber and the filter chamber of the dust collector to fix the filter bag and the filter bag frame.
3.9
Pulse valve
A diaphragm valve that is controlled by a pilot valve and instantly blows compressed air.
3.10
Electro-magnetic pulse valve
The solenoid pilot valve is combined with the pulse valve, and the diaphragm valve is controlled by electrical signals.
3.11
Pulse-air manifold
A container that is repeatedly filled with compressed air to ensure the dust removal effect in the pulse jet bag filter.
3.12
Gas distribution device
A device used to adjust the air distribution between the filter chambers and the air distribution in the filter chamber.
4 Basic parameters of bag filter selection
4.1 Parameters of boiler and main auxiliary equipment, please refer to Appendix A.
4.2 Design coal quality and smoke dust analysis parameters, see Appendix A.
4.3 The particle size distribution, true density, bulk density, angle of repose and viscosity of the smoke and dust.
4.4 For information on flue gas composition, see Appendix B.
4.5 Refer to Appendix B for the inlet flue gas parameters of the dust collector.
4.6 Other data that should be collected before model selection, including local weather (temperature, air pressure, frozen soil depth, wind load and snow load, etc.),
Geography, engineering geology (engineering geology, peak acceleration of ground motion, basic seismic intensity and altitude, etc.) where the project is located, etc.
according to.
5 Main technical parameters of bag filter
5.1 The outlet smoke and dust concentration should not exceed 20 mg/m3 (standard state, dry basis, oxygen content 6%), and the air-to-cloth ratio should be 0.65~1.2 m3/(m2·min);
When the export soot concentration is required to be ultra-low emission limit, it should be no more than 10 mg/m3 (standard state, dry basis, oxygen content 6%), and the air-to-cloth ratio is appropriate.
5.2 The running resistance of the body should not exceed 1500 Pa.
5.3 The air leakage rate should not be greater than 2.0%.
5.4 The design life of the body should not be less than 30 years.
5.5 Under design conditions, the service life of the filter bag should not be less than 4 natural years or 30,000 operating hours.
5.6 The operating noise at 1.0 m outside the equipment should not exceed 85 dB(A).
6 The composition of the bag filter
The bag filter consists of body structure, filter bag, filter bag frame, dust removal air source, pulse valve, supporting process system, electrical and control system
System composition.
7 Choice of body structure
7.1 Overall technical requirements for the ontology structure
7.1.1 The main body structure consists of an intake smoke box, air distribution device, ash hopper, support, filter chamber, flower plate, clean air chamber, exhaust smoke box, pulse
It consists of flushing and blowing device and auxiliary facilities.
7.1.2 The main structure of the dust collector should be a frame steel structure, and the auxiliary facilities include platforms, stairs, railings, measuring points and other safety protections
Measures. The design is implemented in accordance with the provisions of GB 50017, GB 4053.1, GB 4053.2, and GB 4053.3.
7.1.3 The compressive strength of the dust collector shell should be calculated according to the full pressure of the ID fan nameplate. When it is less than 6000Pa, the compressive strength should be calibrated at 6000Pa.
nuclear.
7.1.4 The structural tolerance temperature should be designed according to the highest temperature of flue gas treatment.
7.1.5 The following factors should be considered in the design. the amount of flue gas to be treated, the dust removal process and equipment configuration, load distribution and characteristics, operation
And maintenance, safety protection measures, fire protection, heat preservation and painting, location of measuring points, etc.
7.1.6 The design of body structure, support and foundation shall consider dead load, live load, wind load, snow load, maintenance load and seismic load, and shall
Risk portfolio design.
7.2 Technical requirements for each component of the body structure
7.2.1 Intake smoke box and air distribution device
7.2.1.1 The air flow distribution device should be reasonably designed in the intake smoke box, and it should be designed according to the results of the air distribution simulation test, so that the air entering the dust collector
The flue gas is evenly distributed to each filter unit to reduce secondary dust and prevent the flue gas from directly washing the filter bag.
7.2.1.2 The deviation between the design flue gas flow rate and the mean value of the filter chamber should not exceed ±5.0%.
7.2.1.3 The deviation between the design flue gas flow rate and the mean value of the filter room with filtering and cleaning function units should not be greater than ±5.0%.
7.2.1.4 The air distribution device should be able to withstand the impact of flue gas and have a certain degree of wear resistance. Q345B steel plate should be used with thick steel plate.
The degree should not be less than 3.0 mm.
7.2.1.5 After the dust collector is installed, it can be tested and adjusted on site during cold trial operation.
7.2.2 Ash bucket
7.2.2.1 The ash hopper is usually designed in a quadrangular pyramid shape, and the steel structure should be designed in accordance with GB 50017.The ash hopper wall should be designed according to the strength requirements.
Design horizontal and vertical outer stiffeners. The design angle of the ash hopper should be determined according to the nature of the smoke and dust, such as the particle size distribution, angle of repose,
Moisture content, temperature, viscosity, etc., the design angle should not be less than 60º, the edges where the two sides of the ash hopper intersect, and the edges should be eliminated, and the interior should be smooth and flat.
whole.
7.2.2.2 The ash hopper and the ash hopper beam shall be continuously welded and properly reinforced, and the connection between the components shall meet the air tightness and strength requirements.
After the ash hopper is manufactured, a leakage test shall be conducted on the weld.
7.2.2.3 The ash hopper should be equipped with a high-level ash level alarm device, heating device, fluidization device, air cannon, maintenance manhole door, and mechanical poke.
The ash hole and the upper part of the ash bucket should be equipped with steel grids and maintenance channels.
Note 1.The fluidization device is generally equipped with a gasification plate, and the air supply system should be Roots blower, air electric heater and regulating valve, etc. The pressure on the gray side of the gasification plate should be 40kPa.
If it is an independent system, the selection pressure of the fan is equal to the sum of the air supply pressure of the branch pipeline (55kPa) and the longest pipe resistance; the flow of the fan is equal to
The total air volume of gasification in the ash hopper of the bag filter.
Note 2.In general, it is sufficient to configure both fluidization device and air cannon.
7.2.3 Support
The fixed support and movable support should be used to connect the filter chamber of the dust collector and the support frame.
7.2.4 Filter room
7.2.4.1 The filter room can be designed as one or several frame type, relatively independent sealed structure, through side wall panels, partition walls, and air outlet walls
The slab is connected with vertical members such as columns and beams to form a spatial force system.
7.2.4.2 The bottom of the filter bag of the filter chamber should be kept a certain distance from the upper plane of the ash hopper.
7.2.5 Flower board
7.2.5.1 The mechanical properties of the pattern material should be no less than Q235B flat plate, and the plate thickness should be no less than 6.0 mm.
7.2.5.2 The pattern hole should be smooth and free of burrs, the surface roughness of the inner hole processing should not be greater than Ra12.5, the cut end face of the pattern hole and the surface of the panel
The perpendicularity tolerance is 0.30 mm, and the flatness tolerance should not be greater than 1/1000 of the length of the pattern; the limit deviation of the geometric dimension of the pattern hole is ±0.50
mm, the position limit deviation of the hole center is ±0.50 mm. For example, the hole arrangement of the flower plate adopts concentric circles, and any two adjacent concentric
The limit deviation of the radius difference of the circle is ±0.75 mm, and the limit deviation of the radius difference between the innermost circle and the outermost circle is ±1.5 mm.
7.2.5.3 The gas shielded intermittent welding method shall be adopted for welding between the rib and the flower plate to prevent welding deformation. Flower board combination should be used
By welding, the assembled flower plate should meet the requirements specified in 7.2.5.2, and the strength should meet the suspension of all filter bags and filter bag frames.
And in the filtering state, there is no deformation or distortion under the state of 5kg of ash hanging on each filter bag.
7.2.6 Clean air chamber
7.2.6.1 The clean air chamber is above the filter chamber, separated by a flower plate in the middle. The number of clean air chambers should be the same as the filter chamber.
7.2.6.2 The height of the high clean air chamber should be greater than 2.0 m, and the height of the low clean air chamber should be greater than 0.50 m. The clean air chamber should be equipped with an overhaul door and set as required
Windows and ventilation holes.
7.2.7 Outlet smoke box
The outlet of the dust collector is equipped with a smoke box.
7.2.8 Pulse blowing device
7.2.8.1 It is composed of air distribution box, electromagnetic pulse valve, connecting pipe and blowing pipe (including nozzle).
7.2.8.2 The design of the gas distribution box shall be implemented in accordance with JB/T 10191.
7.2.8.3 The model and parameters of the electromagnetic pulse valve are determined by the dust removal method, installation structure type, dust removal filter bag area and process requirements.
7.2.8.4 The nozzle type, size and quantity are determined by the cleaning method and process requirements.
7.2.9 Auxiliary facilities
7.2.9.1 The top of the dust collector can be equipped with a lifting device. The lifting weight shall not be less than the weight of the maximum maintenance parts.
7.2.9.2 The thermal insulation, waterproof and exterior decoration of the dust collector body shall meet the requirements of DL/T 5072.Manhole doors and overhaul doors should be insulated structures.
7.2.9.3 When the number of filter chambers is 2 or more, a shut-off valve should be installed at the inlet and outlet of each filter chamber, and the air leakage rate of the shut-off valve should not exceed 1.0%.
7.3 Technical requirements for body structure installation
The installation of the dust collector body structure should meet the requirements of JB/T 8471, DL/T 1121 and GB 50205.
8 Selection of filter bag for dust collector
8.1 Technical requirements for filter media
8.1.1 The main basic physical parameters of the fiber used in the filter material and the basic physical parameters of the filter material shall meet the requirements of DL/T 1175.
8.1.2 For the post-processing method of the filter material, see Appendix C.
8.2 Selection of filter material
8.2.1 When the outlet smoke dust concentration is not more than 20mg/m3 (standard state, dry basis, oxygen content 6%), polyphenylene sulfide (PPS) should be added to the dust-facing surface of the filter material
Superfine fiber or polyimide (PI). The microfiber denier is not more than 1.3 denier.
8.2.2 When the outlet smoke and dust concentration is not more than 10 mg/m3 (standard state, dry basis, oxygen content 6%), the content of the filter material should not be less than
20% polyphenylene sulfide ultra-fine fiber, and the needle-punched suture is coated with glue; or use PTFE coated filter material, the performance of the coated filter
The standard shall meet the requirements of HJ/T 326.
8.2.3 When using glass fiber cloth filter material, the dust-facing surface should be covered with a film.
8.3 Selection of filter bag
8.3.1 The requirements of filter bag making and other requirements shall comply with DL/T 1175.
8.3.2 The length of the glass fiber cloth coated filter bag should be 10-20mm longer than the length of the filter bag frame.
8.3.3 The inner diameter of the glass fiber cloth coated filter bag should be greater than the maximum diameter of the filter bag frame by 0.6mm to 1.2mm.
9 Selection of filter bag frame of dust collector
9.1 Material of filter bag frame
According to the manufacturing process requirements of the filter bag frame, the mechanical strength of the filter bag frame material should not be lower than the Q235 strength level specified in GB/T 700
Claim. When the filter bag frame needs to be anti-corrosive, the anti-corrosion performance is not less than 304 stainless steel.
9.2 Manufacture of filter bag frame
9.2.1 The manufacture of filter bag frame shall meet the requirements of HJ/T 325.
9.2.2 The back support ring and longitudinal ribs of the filter bag frame are evenly distributed, and should have sufficient strength and rigidity to withstand the filter bag in the filtering and cleaning state.
The gas pressure shock in the state, and prevent damage and deformation during normal transportation and installation. Guaranteed to run for 1.0 h under -3000Pa
The post-plastic deformation is less than 3.0 mm.
9.2.3 All welding points of the filter bag frame shall be welded firmly, and there shall be no desoldering, false welding and missing welding.
9.2.4 The contact surface of the filter bag frame and the filter bag should be smooth and clean without welding scars, unevenness and burrs.
9.2.5 The diameter, circumference, length and vertical deviation of the filter bag frame for needle-punched felt or spunlace felt filter bags shall meet the requirements of Table 1 to Table 3.
9.2.6 The perimeter, length, spacing of longitudinal ribs and vertical deviation of the filter bag frame for glass fiber cloth covered filter bags shall meet the requirements of Table 4.
9.3 Anticorrosion of filter bag frame
The surface of the filter bag frame should be treated with high temperature and corrosion resistance, and high temperature resistant silicone spray coating or other equivalent or above performance should be used.
Coating, the thickness of the coating should be 60 μm to 100 μm.
10 Selection of gas source for cleaning dust
10.1 The gas source for dust removal can be compressed air prepared by air compressors and Roots blowers.
10.2 When an air compressor is used, the gas source for dust removal should be degreasing, purifying and dust removal, and dewatering and drying, and an air storage tank should be equipped near the dust collector.
Configure a pressure regulating valve at the outlet of the gas storage tank.
10.3 When Roots blower is used, no gas storage tank is required.
11 Selection of pulse valve
11.1 The technical requirements, test methods, inspection rules, packaging, marking, storage and transportation of impulse valves shall comply with the relevant requirements of JB/T 5916.
Regulations.
11.2 The selection of pulse valve should be determined according to the number, diameter, length, shape of the filter bag and the required air source parameters and air volume.
11.3 The pulse valve should be installed horizontally or vertically on the gas distribution box, the center of the output port should be coincident with the center of the valve body, and the output port should be parallel to the valve seat.
11.4 Under normal use conditions, the service life of the diaphragm should be no less than 1 million times.
12 Selection of supporting process system for dust collector
12.1 Pre-coating system of dust collector
12.1.1 For newly-built projects, batch replacement of bags or suspension of operation for more than 1 month, pre-coating should be carried out before the dust collector is put into hot operation.
12.1.2 Seamless steel pipes should be used for pre-coated pipes, and the air flow velocity of pre-coated pipes should be controlled at about 15m/s.
12.1.3 The inlet connection type shall be matched with the ash outlet pipe nozzle of the pre-painted ash tank truck.
12.1.4 The ashing point of the pre-coating system should be located on the horizontal flue in front of the dust collector, and each branch pipe should be equipped with shut-off valves.
12.2 Emergency water spray cooling system for dust collector
12.2.1 An emergency water spray cooling system should be installed before the inlet of the dust collector.
12.2.2 Air-liquid two-phase flow spray gun should be used for emergency water spray cooling system. The spray gun should be set on the straight section of the flue in front of the inlet of the dust collector.
The sprayed droplets should be completely evaporated before entering the dust collector. The maximum diameter of the droplets should not be greater than 140 μm, and the average diameter should be less than 54 μm.
12.2.3 The emergency water spray cooling system should be automatic and adjustable, and the maximum temperature drop should not be less than 30℃.
12.2.4 The spray gun used in the emergency water spray cooling system and the pipe inside the ...
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