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DL/T 461-2019: Guide for operation and the maintenance of electrostatic precipitators for coal-fired power plants
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Guide for operation and the maintenance of electrostatic precipitators for coal-fired power plants
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Guide for operation and the maintenance of electrostatic precipitators for coal-fired power plants
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| DL/T 461-1992 | English | 719 |
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Guide for Operation, Maintenance and Management of Electrostatic Precipitators for Coal-Fired Power Plants
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Basic data | Standard ID | DL/T 461-2019 (DL/T461-2019) | | Description (Translated English) | Guide for operation and the maintenance of electrostatic precipitators for coal-fired power plants | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | J98 | | Classification of International Standard | 27.100 | | Word Count Estimation | 23,278 | | Date of Issue | 2019 | | Date of Implementation | 2019-10-01 | | Issuing agency(ies) | National Energy Administration | DL/T 461-2019: Guide for operation and the maintenance of electrostatic precipitators for coal-fired power plants
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Guide for operation and the maintenance of electrostatic precipitators for coal-fired power plants
ICS 27.100
J 98
People's Republic of China Electric Power Industry Standard
Replace DL/T 461-2004
Guidelines for operation and maintenance of electric precipitators in coal-fired 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 Terms and definitions...1
4 Inspection and acceptance of electrostatic precipitator...2
5 Operation of the electrostatic precipitator...6
6 Operation optimization, thermal performance test and management of electrostatic precipitator...7
7 Maintenance and overhaul of electrostatic precipitator...8
8 Safety measures and precautions...10
Appendix A (Normative Appendix) Main design parameters and equipment specifications of electrostatic precipitators...12
Appendix B (Informative Appendix) Acceptance Documents and Information of Electrostatic Precipitator...13
Appendix C (informative appendix) thermal performance test and optimization adjustment test of electrostatic precipitator...14
Appendix D (informative appendix) typical faults and treatment methods of electrostatic precipitators...16
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 replaces DL/T 461-2004 "Guidelines for Operation and Maintenance of Electrostatic Precipitators in Coal-fired Power Plants". Compared with DL/T 461-2004, except for editorial
The main technical changes are as follows.
--Add low-temperature electric precipitator and mobile plate type electric precipitator inspection, acceptance, commissioning and operation, maintenance and repair related content (see section 4.
Chapters 5 and 7).
--- Increase the relevant technical requirements and troubleshooting methods for high-frequency power supplies and three-phase high-voltage rectifier power supplies (see Chapter 4, Appendix D).
--- Increase the operation optimization method and optimization test related content of the electrostatic precipitator (see 6.2, Appendix C).
--- Increase the electric precipitator operation power consumption test content (see 6.3.3).
--Combining the new technology of electrostatic precipitator and the ultra-low emission transformation of coal-fired power plants, the unsuitable formulations, requirements, parameter indicators, etc. in the original standard
The content is revised.
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 08).
Drafting organizations of this standard. Xi'an Thermal Power Research Institute Co., Ltd., Zhejiang Dawei High-Tech Co., Ltd.
The main drafters of this standard. Liu Yuan, Li Dongyang, Shi Xiaodong, Zhang Binwei, Jin Lianmin, Wang Zhaoguo, Shen Qiude, Guo Bin, Chen Jianying,
Li Qingzhi
This standard was first issued in.1992 and revised for the first time in.2004.This is the second revision.
The opinions or suggestions during the implementation of this standard will be fed back to the Standardization Management Center of the China Electricity Council (Baiguang Road 2nd, Beijing)
Article No. 1, 100761).
Guidelines for operation and maintenance of electric precipitators in coal-fired power plants
1 Scope
This standard specifies the operation and maintenance of electric precipitators and auxiliary equipment for coal-fired power plants.
This standard applies to electric precipitators in coal-fired 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 article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 13931 Performance test method of electrostatic precipitator
GB 50065 Grounding design code for AC electrical installations
GB 50148 Code for construction and acceptance of power transformers, oil-immersed reactors, and transformers for electrical installation engineering
GB 50169 Code for construction and acceptance of grounding devices for electrical installations
GB 50171 Electrical installation engineering panel, cabinet and secondary circuit wiring construction and acceptance specification
GB 26164.1 Electrical Safety Work Regulations Part 1.Heat and Machinery
DL/T 514 Electric dust collector
DL 5190.2 Electric Power Construction Technical Code Part 2.Boiler Unit
HJ 75 Technical specification for continuous monitoring of emission of stationary pollution source flue gas (SO2, NOX, particulate matter)
HJ 76 Technical requirements and testing methods for continuous monitoring system for emission of stationary pollution source flue gas (SO2, NOX, particulate matter)
SDJ99 Electrostatic Precipitator Construction Technology Guide
SD110 Electric measuring indicating instrument inspection regulation
JJG 186 Moving Coil Temperature Indication (Indicating Position Adjustment) Instrument Verification Regulation
JJG 617 Verification Regulation of Digital Temperature Indicating Regulator
JB/T 5845 Test method of rectifier equipment for high-voltage electrostatic dust removal
JB/T 9688 Thyristor control high voltage power supply for electrostatic precipitator
JB/T 11395 Three-phase high voltage rectifier power supply for electric dust removal
JB/T 10862 Low-voltage control device for electrostatic precipitator
JB/T 11268 Electricity-saving guidelines for electrostatic precipitators
JB/T 11311 Mobile plate type electric dust collector
JB/T 11639 High frequency and high voltage rectifier equipment for dust removal
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Low-low temperature electrostatic precipitator
Electrostatic precipitator for treating flue gas temperature below the acid dew point and used for flue gas treatment of coal-fired boilers.
3.2
Operation optimization of electrostatic precipitator
According to changes in working conditions such as unit load, coal type, etc., the operation mode and operation mode of the high-voltage power supply, rapping system, and heating system of each electric field of the electrostatic precipitator
The control parameters are optimized and adjusted to reduce operating energy consumption while meeting the smoke and dust emission control targets.
4 Inspection and acceptance of electrostatic precipitator
4.1 General rules
The inspection of the electrostatic precipitator should be carried out before the trial operation, and the acceptance is qualified. The main design parameters and equipment specifications of the electrostatic precipitator are shown in the attachment
Record A. Refer to Appendix B for acceptance documents and materials.
4.2 Body part
4.2.1 Metal structural parts
Check the installation quality of beams, columns, rods, plates, frames, and shells of metal structural parts, and shall comply with Section DL 5190.2 of Technical Code for Construction of Electric Power
Part 2.Boiler unit.
4.2.2 Tightness check
Before laying the insulation layer, check the tightness of the body, and it should meet the requirements of SDJ99.
4.2.3 Distance between poles
Check the distance between the same pole and the opposite pole. The limit deviation should meet the requirements of DL/T 514.
4.2.4 Internal components
Check that the internal parts of the electrostatic precipitator should be free of sharp corners and burrs. Especially for the dust collector and discharge electrode frame, if the sharp corners and burrs are found, they should be eliminated immediately
except.
4.2.5 Dust collecting electrode, discharge electrode and dust removal device
4.2.5.1 All bolts and nuts of the dust collecting electrode and discharge electrode system should be tightened and be welded without rotation.
4.2.5.2 The installation of the discharge electrode should meet the design requirements and the tightness should be moderate.
4.2.5.3 The flatness of the dust collecting electrode plate row is 10mm, the difference between the diagonal lengths is not more than 5mm, the positioning suspension and guiding structure are good, and the dust collection
The gap between the lower end of the electrode plate row and the baffle plate of the ash hopper should meet the needs of thermal expansion.
Phenomenon to ensure the transmission of rapping acceleration.
4.2.5.4 The minimum discharge distance between the dust collecting electrode and the upper, middle and lower part of the discharge electrode frame shall meet the design requirements.
4.2.5.5 The adjustment of the rapping shaft system should meet the design requirements. the horizontal deviation of the center line of the side rapping shaft is not more than ±1.5mm, and the coaxial deviation is in phase.
The distance between the two adjacent bearing seats is 1mm, and the full shaft length is 3mm; when top rapping is used, the perpendicularity between the insulated shaft and the supporting rod is not more than 0.3%.
4.2.5.6 The insulator for suspending the electrode should be placed vertically in the beam (upper), the allowable deviation of the upper flange surface of the insulator is less than 1mm, and the dust cover
The allowable deviation of the electrode suspension rod is 5mm.
4.2.5.7 The rapping mechanism should rotate flexibly and in the correct direction, and the striking position and misalignment angle of each hammer should meet the design requirements, without jamming, and slow down
The oil level of the tank is normal; when the top rapping is used, the lifting height of the electromagnetic hammer is adjustable, the position is accurate, and there is no jamming phenomenon when free falling.
4.2.5.8 The dust collecting electrode, discharge electrode and dust removal device of the mobile plate type electrostatic precipitator shall meet the requirements of JB/T 11311.
4.2.6 Discharge electrode frame
4.2.6.1 Check that the allowable deviation of the distance between the channel steel of the upper cross beam and the bottom surface of the beam of the maximum discharge frame is not more than 5mm.
4.2.6.2 The two frames in the same electric field shall have the same height, and the allowable deviation shall not exceed 5mm.
4.2.6.3 The allowable deviation of the front and rear large frame spacing and diagonal line within the same electric field is not more than 10mm, and the allowable deviation of the vertical line is not more than 10mm.
4.2.6.4 The installation distance deviation of other forms of discharge wire frame shall meet the design requirements.
4.2.7 Groove plate
Check that the layout and connection of the trough plate should meet the design requirements.
Same row spacing 100mm, allowable deviation ±10mm
Different row spacing 60mm allowable deviation ±10mm
Verticality is not more than 5‰
Parallelism is not more than 10‰
4.2.8 Smoke isolation device
Check that the installation of the baffle plate and ash hopper baffle plate between the side wall and the dust collector should meet the design requirements.
4.2.9 Diversion and current sharing device
Check that the installation positions and angles of the inlet flue deflector and the equalizing plate are correct, the welding of the deflector and the air distribution plate and the bottom of the inlet flue
The distance between should meet the design requirements.
4.2.10 Insulation device
The insulator chamber and the vibrating porcelain shaft chamber where the electrode is suspended should be dry and clean; the insulator is intact and the heating device (hot air blowing) is fully equipped
The electrical wiring is correct; when the top rapping is used, the insulated shaft room should be dry and clean, rainproof and dew-proof.
4.2.11 Ash bucket
The lower flange of the ash hopper and the board box, the board box and the ash unloader should be tightly sealed, and the board should be opened and closed flexibly. No dust and corrosion problems in the ash hopper
Problem, the external insulation is intact. The ash hopper steam heating or electric heating equipment is reliable in turning on and off, and the heating temperature is adjustable.
4.2.12 Manhole door
Manhole doors should be opened and closed flexibly, well sealed, and have reliable grounding and safety interlocking devices. Low and low temperature electrostatic precipitator should focus on manhole inspection
Corrosion within 1 meter of the door and its surroundings.
4.2.13 Piping system
The valves and pipe joints of the ash discharge pipeline, steam heating pipeline, hot air pipeline and water flushing pipeline should be well sealed and flexible to open and close.
4.2.14 Internal inspection
The body of the electrostatic precipitator should be clean and free of debris. Low and low temperature electrostatic precipitator should focus on checking the internal (including flue) fouling, scaling and corrosion.
4.2.15 Flue baffle
The inlet and outlet flue air baffle doors should be opened and closed flexibly, indicating the correct position.
4.2.16 Insulation and outer shield
The insulation laying is intact and the thickness of the insulation layer meets the design requirements. The heat-insulating outer protective board should be neat, beautiful, firm and not leaking.
4.2.17 Peripheral facilities
4.2.17.1 The stairs, platforms and railings of the electrostatic precipitator are sturdy and reliable, and the lighting facilities are complete.
Test platform and guardrail.
4.2.17.2 The test hole, pipe seat and test platform used for the performance test of the electrostatic precipitator shall be installed at the position specified in the design drawing, and shall comply with GB/T
13931 request. During the non-test period, the measuring hole plug should be sealed tightly to prevent air leakage and rain leakage.
4.3 Electrical part
4.3.1 General provisions
All electrical equipment should meet the requirements of GB 26164.1.The grounding device of high and low voltage electrical equipment should meet the requirements of GB 50065, and
Strictly inspect according to the manufacturer's instructions.
4.3.2 Grounding device of electrostatic precipitator
4.3.2.1 The electrostatic precipitator shall be equipped with a dedicated grounding network, and the grounding resistance shall not be greater than 1Ω.
4.3.2.2 There should be no less than 6 connection points between each electrostatic precipitator body and the grounding grid.
4.3.2.3 Check the grounding points of the housing of the electrostatic precipitator, the housing of the low-voltage distribution cabinet and the housing of the transmission motor. The grounding points should be reliable and comply with GB 50169.
Requirements.
4.3.3 High voltage isolation part
The high-voltage isolating switch or high-voltage isolating knife switch is flexible in operation and the indication position is accurate.
4.3.4 High-voltage cable section
When high-voltage cables are used for power supply, the insulation resistance, leakage current and DC withstand voltage test of the cable should be checked and accepted, and the records should be archived.
All indicators should meet the technical requirements of the cable.
4.3.5 High-voltage power supply equipment
4.3.5.1 The high-voltage power supply controlled by thyristor shall meet the requirements of JB/T 9688; the three-phase high-voltage rectifier power supply shall meet the requirements of JB/T 11395, high
The high-frequency high-voltage power supply shall meet the requirements of JB/T 11639.
4.3.5.2 When the silicon rectifier transformer arrives at the site after long-distance transportation, it shall be checked and accepted in accordance with the provisions of GB 50148 and JB/T 5845.
4.3.5.3 Electrical measuring instruments shall be routinely inspected in accordance with SD110; temperature control instructions and thermal instruments shall be in accordance with JJG 186 and JJ
G617 carries out routine inspection. The warning position of the rated indication value of the equipment is required to be marked with a red mark.
4.3.5.4 The high voltage control wiring shall meet the requirements of GB 50171.
4.3.5.4.1 The wiring from the power cabinet to the high voltage control cabinet is correct.
4.3.5.4.2 The wiring from the high-voltage control cabinet to the silicon rectifier transformer is correct.
4.3.5.4.3 The wiring from the high-voltage control cabinet to the upper computer is correct.
4.3.5.5 The withstand voltage and insulation resistance of the high-voltage control cabinet and rectifier transformer are qualified.
4.3.5.6 The housing is intact, the seal is intact, and the installation is firm.
4.3.5.7 The high-voltage silicon rectifier transformer and high-voltage control cabinet should be grounded firmly and reliably.
4.3.5.8 Check that all wiring of the high-voltage power supply equipment is correct and reliable.
4.3.5.9 The rectifier transformer is well sealed, there is no oil leakage, and the oil level should be normal.
4.3.5.10 When the rectifier transformer is arranged on the top, there is no blockage of the lower oil pan, oil drain pipe, valve, etc.
4.3.5.11 Check whether the high-voltage power supply has abnormal sound, and whether there is abnormal discharge at the high-voltage output terminal.
4.3.5.12 Check whether there is abnormal sound at the air outlet of the cooling fan, and the outlet of the fan should not be blocked.
4.3.6 Low-voltage control device
4.3.6.1 The low-voltage control device of the electrostatic precipitator shall meet the requirements of JB/T 10862.Low-voltage wiring inspection should meet the requirements of GB 50171.
4.3.6.2 The wiring from the power cabinet to the low-voltage control cabinet is correct;
4.3.6.3 Low-voltage control cabinet to rapping motor, electromagnetic rapping coil, ash unloading motor, electric heating, silo wall vibrator, thermometer, material level indicator
Wait for the wiring to be correct;
4.3.6.4 The wiring from the low-voltage control cabinet to the upper computer is correct.
4.3.7 Safety interlock
Check that the wiring of the safety interlock panel is correct and the interlock function is reliable.
4.3.8 Withstand voltage test
4.3.8.1 The high and low voltage electrical equipment of the electrostatic precipitator shall undergo insulation and voltage withstand tests before trial operation.
4.3.8.2 Check that the withstand voltage ratings of high-voltage isolating switches, suspended electrode insulators, insulating porcelain shafts, vibration insulating shafts, bushings and other equipment should comply with
Meet the design requirements.
4.3.8.3 The insulation resistance of the low-voltage winding and low-voltage porcelain bushing of the high-voltage silicon rectifier transformer shall not be less than 300MΩ.
The insulation resistance of the high-voltage porcelain bushing should not be less than 1000MΩ.
4.3.8.4 The insulation resistance in the electric field of the electrostatic precipitator should not be less than 500MΩ.
4.3.8.5 The insulation resistance of the rapping and ash unloading motor should be greater than 0.5MΩ.
4.3.8.6 The coil insulation resistance of the electromagnetic rapper should be greater than 0.5MΩ.
4.3.8.7 The insulation resistance of the coil of the silo wall vibrator should be greater than 0.5MΩ.
4.4 Control system
4.4.1 External equipment
According to the manufacturer's instructions, check whether the external equipment is complete and the control system is normal.
4.4.2 External device wiring
Check that the connection between the host computer and the high-voltage control cabinet, low-voltage control cabinet, continuous smoke and dust monitoring and remote communication systems is correct.
4.4.3 Control system function
The control system functions well, and the functions of commissioning, shutdown, and remote control are well switched.
4.5 Smoke and dust continuous monitoring system
5.5.1 The surface of the instrument should be intact and free from obvious defects, the parts should be connected reliably, the operation keys and buttons should be used flexibly, and the positioning should be accurate.
4.5.2 The installation location, debugging and testing methods, and acceptance methods of the continuous smoke and dust monitoring system shall meet the relevant requirements in HJ75 and HJ76.
4.6 Cold state debugging of electrostatic precipitator
4.6.1 Test run of rotating machinery
4.6.1.1 Trial run of the rapping mechanism. power on and test run to confirm that the direction of rotation of the motor is correct, and there is no drop of hammer, empty hammer, jamming, hammer and anvil
The contact is good, and the reducer has no oil leakage.
4.6.1.2 Trial operation of the ash unloading system. energize to check, confirm that the unloading valve switch is normal, and confirm that the ash unloading motor rotates in the correct direction and there is no abnormal sound.
The temperature rise is normal.
4.6.1.3 Electromagnetic rapping test run. power on and check to confirm that the lifting height of the rapping hammer is correct, the insulated shaft is not damaged, there is no empty hammer, and no jamming.
The hammer is in good contact with the insulated shaft.
4.6.1.4 Trial run of the movable pole plate. power on and test run, confirm that the motor rotation direction is correct, and there is no occurrence of chain-off, plate-off, jamming phenomenon, slow down
The machine has no oil leakage.
4.6.1.5 Trial operation of the mobile electrode plate dust removal device. power on and try to run, confirm that the motor rotation direction is correct and that no jamming occurs, and the dust removal device is
The surface of the anode plate is in good contact, and the reducer has no oil leakage.
4.6.1.6 Trial operation of the ash hopper gasification air system. power on and check to confirm that it is working properly.
4.6.2 Electrical test run
4.6.2.1 The high-voltage power supply disconnects the high-voltage rectifier transformer with a false load. Power on and check whether the main circuit and controller are working normally, and then restore
Complex connection with high-voltage silicon rectifier transformer.
4.6.2.2 Calibration of high-voltage control cabinet indicator. Use a voltmeter and current transformer above level II to verify the primary voltage and current value; use a level II or higher
Use a high-voltage divider (or electrostatic voltmeter) to verify the secondary voltage value; use a voltmeter above grade I to sample the voltage drop value on the resistance; use grade I above
The resistance meter measures the sample resistance value, and calculates the secondary current value.
4.6.2.3 Put in the high-voltage power supply in accordance with the operating regulations of the high-voltage control cabinet, and conduct a cold no-load boost test. Boost the voltage point by point and record the one indicated by the dial
Secondary and secondary voltage and current values, until electric field flashover. Draw the volt-ampere characteristic curve with the secondary voltage value and current value.
The electric field flashover voltage of the high-voltage power supply controlled by the configured thyristor shall meet the requirements of DL/T 514.
a) When the distance between different poles is 150mm, the secondary voltage U2 ≥ 55kV;
b) When the distance between different poles increases by 10mm, the secondary voltage increases ΔU2 ≥ 2.5kV.
When the electrostatic precipitator is equipped with a three-phase high-voltage DC power supply and a high-frequency power supply, the peak discharge voltage of its secondary voltage shall not be lower than the power frequency power supply.
The average value of the secondary voltage should be more than 10% higher than the corresponding power frequency power supply.
4.6.2.4 When performing cold no-load boost test of electrostatic precipitators in high altitude areas, atmospheric pressure correction is required. The correction method is. Danghai
When the altitude is higher than 1000m, the output secondary voltage value is allowed to decrease by 1% every time the altitude increases by 100m.
4.6.2.5 Low-voltage control equipment, such as rapping, ash unloading, silo wall vibration, electric heating, material level, temperature detection and fault alarm, etc., are respectively powered on
Trial operation, the local and centralized control room are operating normally, and the protection system operates correctly.
4.6.3 T...
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