CN109821657B - Purging device for insulator chamber of electric dust collector of coal-fired power plant - Google Patents
Purging device for insulator chamber of electric dust collector of coal-fired power plant Download PDFInfo
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- CN109821657B CN109821657B CN201910186508.8A CN201910186508A CN109821657B CN 109821657 B CN109821657 B CN 109821657B CN 201910186508 A CN201910186508 A CN 201910186508A CN 109821657 B CN109821657 B CN 109821657B
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- 239000000428 dust Substances 0.000 title claims abstract description 92
- 239000012212 insulator Substances 0.000 title claims abstract description 79
- 238000010926 purge Methods 0.000 title claims abstract description 52
- 239000003546 flue gas Substances 0.000 claims abstract description 91
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 90
- 238000000034 method Methods 0.000 claims abstract description 5
- 238000002955 isolation Methods 0.000 claims description 60
- 238000007254 oxidation reaction Methods 0.000 claims description 29
- 230000001105 regulatory effect Effects 0.000 claims description 29
- 230000003647 oxidation Effects 0.000 claims description 28
- 239000012716 precipitator Substances 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 16
- 239000000779 smoke Substances 0.000 claims description 8
- 239000002253 acid Substances 0.000 abstract description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000012717 electrostatic precipitator Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004509 smoke generator Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Abstract
The invention discloses a purging device and a purging method for an insulator chamber of an electric dust collector of a coal-fired power plant, wherein the purging device comprises a flue gas loop, an air loop, a main flue gas pipeline and a control system; when the purging device for the insulator chamber of the electric dust collector of the coal-fired power plant provided by the invention is used, under the working condition that the temperature of flue gas is higher than the acid dew point and is higher than 20% of the rated load of a boiler, the dedusted flue gas in the flue gas loop is adopted to heat and purge the insulator chamber of the electric dust collector. Under the operating mode that is lower than 20% of rated load of the boiler, the temperature of the flue gas is relatively reduced, and the flue gas is possibly lower than the acid dew point, so that the electric dust collector is ensured to safely operate under the low-load operating mode and the electric dust collector insulator is prevented from being damaged.
Description
Technical Field
The invention relates to a purging device for an insulator chamber of an electric dust collector of a coal-fired power plant.
Background
The working principle of the electrostatic precipitator is that a high-voltage electric field is generated by utilizing cathode and anode electrodes arranged in the electrostatic precipitator, so that dust in flue gas is charged and separated from the flue gas along with the dust under the action of the electric field. The cathode frame of the electric dust collector is high negative voltage, and a pressure-bearing insulator is arranged between the electric dust collector shell and the cathode frame in order to insulate the cathode frame from the electric dust collector shell. The bearing insulator is an important part of the electric dust collector and is used for bearing the weight of the cathode and insulating. The inner surface of the pressure-bearing insulator contacts with the flue gas flowing through the electric dust collector, the inner surface is automatically heated, the outer surface is surrounded by air, and when the temperature is low, the flue gas in the insulator is easily condensed into water on the inner wall, so that the insulating property of the insulator is reduced. At present, a special device is adopted to keep the surface of the insulator dry and powder-proof, but the existing special device has the defect of high use cost.
Disclosure of Invention
The invention aims to provide a purging device for an insulator chamber of an electric precipitator of a coal-fired power plant, which solves one or more of the problems in the prior art.
According to one aspect of the invention, there is provided a purging device for an insulator chamber of an electric precipitator of a coal-fired power plant, comprising a flue gas loop, an air loop, a main flue gas duct and a control system; the smoke loop comprises an electric dust collector body, an induced draft fan, an electric dust collector insulator chamber, a first air supply pipeline, an exhaust pipeline, a first temperature sensor, a second temperature sensor and a first isolation valve; the first temperature sensor is arranged on the main flue gas pipeline, the second temperature sensor is arranged in the insulator chamber of the electric dust collector, the first isolation valve is arranged on the first air supply pipeline, and the first isolation valve is controlled by the control system; the first temperature sensor and the second temperature sensor are in electrical signal connection with a control system; the air loop comprises an oxidation fan, a blower, an air preheater, a cold and hot air mixing box, a second air supply pipeline, a third air supply pipeline, a fourth air supply pipeline and a fourth isolation valve; the fourth isolation valve is arranged on the fourth air supply pipeline and is controlled by the control system; one end of the electric dust collector body is communicated with the main smoke device pipeline, the other end of the electric dust collector body is communicated with one end of the induced draft fan, the other end of the induced draft fan is communicated with the electric dust collector insulator chamber through the first air supply pipeline, one end of the exhaust pipeline is communicated with the electric dust collector insulator chamber, and the other end of the exhaust pipeline is communicated with the main smoke pipeline; the oxidation fan is communicated with the cold and hot air mixing box through a second air supply pipeline, the air feeder is communicated with the air preheater, the air preheater is communicated with the cold and hot air mixing box through a third air supply pipeline, one end of a fourth air supply pipeline is connected with the cold and hot air mixing box, and the other end of the fourth air supply pipeline is communicated with the inlet end of the electric dust collector insulator chamber.
In this way, when the purging device for the electric dust collector insulator chamber of the coal-fired power plant provided by the invention is used, under the working condition that the temperature of flue gas is higher than 20% of the rated load of a boiler, the flue gas is higher than the acid dew point (when fuel with high sulfur content is used, part of SO2 formed after combustion is further oxidized into SO3 and combined with water vapor in the flue gas to form sulfuric acid vapor, the condensation temperature of the sulfuric acid vapor in the flue gas is called the acid dew point), and the dedusted flue gas in a flue gas loop is used for heating and purging the electric dust collector insulator chamber. Under the operating mode that is lower than 20% of the rated load of the boiler, the temperature of the flue gas is relatively reduced, and the flue gas temperature is possibly lower than the acid dew point, so that the electric dust collector is ensured to safely operate under the low-load operating mode and the electric dust collector insulator is prevented from being damaged, and the air loop is adopted to heat and purge the electric dust collector insulator chamber. Under the condition of meeting the safe operation requirement of the electric dust collector body, the electric dust collector insulator chamber is purged by utilizing the flue gas after dust removal, the existing equipment of a power plant can be utilized, the investment on a purging device is reduced, the purging operation cost of the electric dust collector insulator chamber is saved, and obvious energy-saving benefits are achieved.
In some embodiments, the flue gas circuit further comprises a first flow meter and a first regulating valve; the first flowmeter is arranged on the first air supply pipeline and is in electrical signal connection with the control system; the first regulating valve is arranged on the first air supply pipeline and is controlled by the control system.
Thus, the control system can monitor the flow of the first air supply pipeline through the first flow meter, and can adjust the first adjusting valve according to the monitoring result so as to achieve the function of adjusting the real-time flow of the first air supply pipeline.
In some embodiments, the air circuit further comprises a second flowmeter disposed on the fourth air supply conduit, the second flowmeter being in electrical signal connection with the control system.
In this way, the control system can monitor the flow of the fourth air supply duct through the second flow meter.
In some embodiments, the system further comprises a second regulating valve, the second regulating valve is arranged on the second air supply pipeline, and the second regulating valve is controlled by the control system.
Thus, the control system can adjust the second adjusting valve according to the monitoring result of the second flowmeter to achieve the function of adjusting the real-time flow of the air quantity input into the fourth air supply pipeline by the oxidation fan.
In some embodiments, a second isolation valve is provided on the second gas supply conduit, the second isolation valve being located between the second regulator valve and the oxidation blower.
Thus, when maintenance is needed, the second air supply pipeline can be isolated by closing the second isolating valve.
In some embodiments, the system further comprises a third regulating valve, the third regulating valve is arranged on the third air supply pipeline, and the third regulating valve is controlled by the control system.
In this way, the control system can adjust the third adjusting valve according to the monitoring result of the second flowmeter and the detected temperature value of the second temperature sensor, so as to achieve the function of adjusting the real-time flow of the hot air input into the fourth air supply pipeline by the blower.
In some embodiments, a third isolation valve is provided on the third air supply conduit, the third isolation valve being located between the third regulator valve and the air preheater.
Thus, when maintenance is needed, the third air supply pipeline can be isolated by closing the third isolating valve.
In some embodiments, the first air supply duct and the air exhaust duct inner surfaces are coated with a corrosion protection layer.
Thus, the first air supply pipeline and the exhaust pipeline have the anti-corrosion function by coating the anti-corrosion layers on the inner surfaces of the first air supply pipeline and the exhaust pipeline, so that the durability is improved.
In some embodiments, a check valve is also included, the check valve being disposed on the exhaust conduit.
Therefore, the check valve can prevent flue gas which is not dedusted from flowing backward from the main flue gas pipeline to enter the insulator chamber of the electric dust collector through the exhaust pipeline, and the insulator chamber of the electric dust collector is prevented from being polluted.
According to another aspect of the invention, a method for purging a purging device of an insulator chamber of an electric precipitator of a coal-fired power plant is provided,
step 101: the control system acquires related signals, wherein the related signals comprise a boiler load value, whether a draught fan, a blower and an oxidation blower operate or not, a temperature signal of a first temperature sensor, a temperature signal of a second temperature sensor, and flow signals of a first flowmeter and a second flowmeter;
step 102: judging whether the induced draft fan operates according to the related signals to obtain a first judging result;
step 103: if the first judgment result indicates that the induced draft fan operates, judging whether the boiler load is greater than 20% of the rated load of the boiler, and obtaining a second judgment result;
step 104: if the second judgment result shows that the boiler load is greater than 20% of the rated load of the boiler, judging whether the temperature of the flue gas after dust removal is greater than a first set temperature and whether the temperature of an insulator chamber of the electric dust remover is greater than a second set temperature, and obtaining a third judgment result;
step 105: if the third judgment result shows that the temperature of the flue gas after dust removal is higher than the first set temperature and the temperature of the insulator chamber of the electric dust remover is higher than the second set temperature, the first isolation valve is opened, the fourth isolation valve is closed, the flue gas loop operates, and the flow of the purging flue gas is regulated according to the signal of the first flowmeter;
step 106: if the second judgment result shows that the boiler load is less than or equal to 20% of the rated load of the boiler, judging whether the blower and the oxidation blower operate or not, and obtaining a fourth judgment result;
if the third judgment result shows that the temperature of the flue gas after dust removal is less than or equal to the first set temperature or the temperature of an insulator chamber of the electric dust remover is less than or equal to the second set temperature, judging whether the air feeder and the oxidation fan operate or not, and obtaining a fourth judgment result;
step 107: if the fourth judgment result shows that the air feeder and the oxidation fan are operated, a fourth isolation valve is opened, the first isolation valve is closed, the air loop is operated, and the temperature and the flow of hot air in the air loop are regulated according to the signals of the second temperature sensor and the signals of the second flowmeter;
step 108: if the fourth judgment result indicates that the air feeder and the oxidation fan do not operate, judging whether the temperature of the flue gas after dust removal is higher than a first set temperature or not, and obtaining a fifth judgment result; if the fifth judgment result shows that the flue gas temperature is higher than the first set temperature, opening the first isolation valve, closing the fourth isolation valve, operating a flue gas loop, and adjusting the flow of the purging flue gas according to the signal of the first flowmeter;
step 109: if the fifth judging result shows that the flue gas temperature is less than or equal to the first set temperature, the purging is not performed; and if the first judgment result indicates that the induced draft fan does not operate, the induced draft fan does not purge.
Drawings
FIG. 1 is a schematic diagram of a purging device for an insulator chamber of an electric precipitator of a coal-fired power plant according to an embodiment of the present invention;
fig. 2 is a flow chart of a purging method of the purging device of the insulator chamber of the electric precipitator of the coal-fired power plant shown in fig. 1.
Reference numerals:
5-third air supply pipeline, 28-third isolation valve, 33-control system, 27-third regulating valve, 2-air loop, 24-cold and hot air mixing box, 6-fourth air supply pipeline, 25-fourth isolation valve, 26-second flowmeter, 4-second air supply pipeline, 21-oxidation fan, 22-second isolation valve, 23-second regulating valve, 29-air preheater, 30-blower, 8-main flue gas pipeline, 17-check valve, 7-exhaust pipeline, 32-second temperature sensor, 16-electric dust collector insulator chamber, 1-flue gas loop, 11-electric dust collector body, 31-first temperature sensor, 3-first air supply pipeline, 12-induced draft fan, 14-first regulating valve, 13-first isolation valve, 15-first flowmeter
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 schematically shows the structure of a purging device for an insulator chamber of an electric precipitator of a coal-fired power plant according to an embodiment of the present invention.
As shown in fig. 1 and 2, the purging device of the insulator chamber of the electric precipitator of the coal-fired power plant comprises a flue gas loop 1, an air loop 2, a main flue gas pipeline 8 and a control system 33; the flue gas loop 1 comprises an electric dust collector body 11, an induced draft fan 12, an electric dust collector insulator chamber 16, a first air supply pipeline 3, an exhaust pipeline 7, a first temperature sensor 31, a second temperature sensor 32 and a first isolation valve 13; the first temperature sensor 31 is arranged on the main flue gas pipeline 8, the second temperature sensor 32 is arranged in the electric precipitator insulator chamber 16, the first isolation valve 13 is arranged on the first air supply pipeline 3, and the first isolation valve 13 is controlled by the control system 33; the first temperature sensor 31 and the second temperature sensor 32 are electrically connected with the control system 33; the air circuit 2 comprises an oxidation fan 21, a blower 30, an air preheater 29, a cold and hot air mixing box 24, a second air supply pipeline 4, a third air supply pipeline 5, a fourth air supply pipeline 6 and a fourth isolation valve 25; a fourth isolation valve 25 is provided on the fourth air supply duct 6, the fourth isolation valve 25 being controlled by the control system 33; one end of the electric dust collector body 11 is communicated with the main smoke generator pipeline 8, the other end of the electric dust collector body 11 is communicated with one end of the induced draft fan 12, the other end of the induced draft fan 12 is communicated with the electric dust collector insulator chamber 16 through the first air supply pipeline 3, one end of the exhaust pipeline 7 is communicated with the electric dust collector insulator chamber 16, and the other end of the exhaust pipeline 7 is communicated with the main smoke gas pipeline 8; the oxidation fan 21 is communicated with the cold and hot air mixing box 24 through the second air supply pipeline 4, the air feeder 30 is communicated with the air preheater 29, the air preheater 29 is communicated with the cold and hot air mixing box 24 through the third air supply pipeline 5, one end of the fourth air supply pipeline 6 is connected with the cold and hot air mixing box 24, and the other end of the fourth air supply pipeline 6 is communicated with the inlet end of the electric dust collector insulator chamber 16.
The working principle is that, specifically, the acid dew point of the flue gas is +108 ℃ according to the calculation of the designed coal type, when in use, the boiler is switched from ignition to boiler shutdown, and the flue gas loop 1 and the air loop 2 are switched: during normal starting, the following steps are carried out: when the boiler is ignited, the induced draft fan 12, the blower 30 and the oxidation blower 21 all operate normally, when the boiler load is 0-20% of rated load, the control system 33 instructs the first isolation valve 13 to be closed, the control system 33 instructs the fourth isolation valve 25 to be opened, the air loop 2 operates, air is sent to the air preheater 29 through the blower 30 to be heated and then is collected into the cold and hot air mixing box 24 through the third air supply pipeline 5, meanwhile, air is collected into the cold and hot air mixing box 24 through the second air supply pipeline 4 by the oxidation blower 21, and then mixed hot air is input into the electric dust collector insulator chamber 16 from the fourth air supply pipeline 6 by the cold and hot air mixing box 24, and the electric dust collector insulator chamber 16 is heated and purged by hot air.
Then, in normal operation: when the boiler load reaches more than 20% of the rated load of the boiler, the hot air in the air loop 2 heats and sweeps the electric dust collector insulator chamber 16 for a period of time, when the temperature in the electric dust collector insulator chamber 16 (the temperature measured by the second temperature sensor 32) is more than 115 ℃ and the temperature of the dedusted flue gas reaches 120 ℃ (the temperature measured by the first temperature sensor 31), the control system 33 instructs the fourth isolation valve 25 to be closed, the control system 33 instructs the first isolation valve 13 to be opened, the flue gas loop 1 operates, and at the moment, the flue gas with heat is blown into the electric dust collector insulator chamber 16 from the first air supply pipeline 3 through the induced draft fan 12 after the dedusting treatment of the main flue gas pipeline 8 by the electric dust collector body 11, and the electric dust collector insulator chamber 16 is swept by the dedusted flue gas with heat in the flue gas loop 1.
When the boiler is normally shut down: when the boiler load is more than 20% of the rated load of the boiler, the dedusted flue gas of the flue gas loop 1 is adopted to purge the electric dust collector insulator chamber 16, when the boiler load is reduced to be less than 20% of the rated load of the boiler, the control system 33 instructs the first isolation valve 13 to be closed, the control system 33 instructs the fourth isolation valve 25 to be opened, the flue gas loop 1 is stopped, the air loop 2 is operated, and the hot air of the air loop 2 is utilized to purge the electric dust collector insulator chamber 16 so as to replace flue gas in the electric dust collector insulator chamber 16.
And (3) fault shutdown: when the blower 30 stops running under the fault or power failure condition, the boiler MFT (main fuel trip) action is triggered, the air loop 2 is in purging failure, the induced draft fan 12 still adopts the smoke loop 1 to purge the electric dust collector insulator chamber 16 under the running condition, and when the temperature of the dedusted smoke is lower than 120 ℃, the first isolation valve 13 is closed, and the smoke loop 1 is closed.
Thus, when the purging device for the electric dust collector insulator chamber of the coal-fired power plant provided by the invention is used, under the working condition that the temperature of flue gas is higher than the acid dew point (when fuel with high sulfur content is used, part of SO2 formed after combustion is further oxidized into SO3 and combined with water vapor in the flue gas into sulfuric acid vapor, the condensation temperature of the sulfuric acid vapor in the flue gas is called the acid dew point), the dedusted flue gas in the flue gas loop 1 is used for heating and purging the electric dust collector insulator chamber 16. Under the working condition that the temperature of the flue gas is lower than 20% of the rated load of the boiler, the temperature of the flue gas is relatively reduced and possibly lower than the acid dew point, and in order to ensure the safe operation of the electric dust collector and prevent the damage of an insulator of the electric dust collector under the low-load working condition, the air loop 2 is adopted to heat and purge the insulator chamber 16 of the electric dust collector. Under the condition of meeting the safe operation requirement of the electric dust collector body 11, the electric dust collector insulator chamber 16 is purged by utilizing the flue gas after dust removal, ready-made equipment can be utilized, the investment and the operation cost are reduced, and obvious energy-saving benefits are achieved.
In this embodiment, the flue gas circuit 1 further comprises a first flow meter 15 and a first regulating valve 14; the first flowmeter 15 is arranged on the first air supply pipeline 3, and the first flowmeter 15 is in electrical signal connection with the control system 33; a first regulating valve 14 is arranged on the first air supply line 3, the first regulating valve 14 being controlled by a control system 33. In this way, the control system 33 can monitor the flow rate of the first air supply duct 3 through the first flow meter 15, and can adjust the first adjusting valve 14 according to the monitoring result to achieve the function of adjusting the real-time flow rate of the first air supply duct 3.
In the present embodiment, the air circuit 2 further comprises a second flowmeter 26, the second flowmeter 26 being arranged on the fourth air supply duct 6, the second flowmeter 26 being in electrical signal connection with the control system 33. In this way, the control system 33 can monitor the flow of the fourth air supply duct 6 by means of the second flow meter 26.
In this embodiment, the second adjusting valve 23 is further included, the second adjusting valve 23 is provided on the second air supply pipe 4, and the second adjusting valve 23 is controlled by the control system 33. In this way, the control system 33 can adjust the second regulating valve 23 according to the monitoring result of the second flowmeter 26 to achieve the function of regulating the real-time flow of the gas quantity input into the fourth gas supply duct 6 by the oxidation blower 21.
In this embodiment, the second isolation valve 22 is further included, the second isolation valve 22 is disposed on the second air supply pipe 4, and the second isolation valve 22 is located between the second adjusting valve 23 and the oxidation blower 21. Thus, when service is required, the second air supply duct 4 can be insulated by closing the second insulation valve 22.
In the present embodiment, the air conditioner further comprises a third adjusting valve 27, the third adjusting valve 27 is arranged on the third air supply pipeline 5, and the third adjusting valve 27 is controlled by the control system 33. In this way, the control system 33 can adjust the third adjusting valve 27 based on the monitoring result of the second flowmeter 26 and the detected temperature value of the second temperature sensor 32 to achieve the function of adjusting the real-time flow rate of the hot air inputted into the fourth air supply duct 6 by the blower 30.
In this embodiment, a third isolation valve 28 is further included, the third isolation valve 28 being provided on the third air supply duct 5, the third isolation valve 28 being located between the third regulator valve 27 and the air preheater 29. Thus, when service is required, the third air supply duct 5 can be isolated by closing the third isolation valve 28.
In this embodiment, the inner surfaces of the first air supply duct 3 and the air discharge duct 7 are coated with an anti-corrosive layer. Thus, by coating the inner surfaces of the first air supply duct 3 and the air exhaust duct 7 with the anticorrosive layer, the first air supply duct 3 and the air exhaust duct 7 have the anticorrosive function, and durability is increased.
In the present embodiment, a check valve 17 is further included, and the check valve 17 is provided on the exhaust pipe 7. In this way, the check valve 17 can prevent flue gas which is not dedusted from flowing back into the electric precipitator insulator chamber 16 from the main flue gas pipeline 8 through the exhaust pipeline 7, so as to avoid polluting the electric precipitator insulator chamber 16.
As shown in fig. 2, in this embodiment, a method for purging a purging device of an insulator chamber of an electric precipitator of a coal-fired power plant is further provided:
step 101: the control system 33 acquires related signals including the boiler load value, whether the induced draft fan 12, the forced draught blower 30 and the oxidation blower 21 are operated, the temperature signal of the first temperature sensor 31 and the temperature signal of the second temperature sensor 32, the flow rate signals of the first flow meter 15 and the second flow meter 26;
step 102: judging whether the induced draft fan 12 operates according to the related signals to obtain a first judging result;
step 103: if the first judgment result indicates that the induced draft fan 12 is operated, judging whether the boiler load is greater than 20% of the rated boiler load, and obtaining a second judgment result;
step 104: if the second judgment result shows that the boiler load is greater than 20% of the rated load of the boiler, judging whether the temperature of the flue gas after dust removal is greater than a first set temperature and whether the temperature of the insulator chamber 16 of the electric dust remover is greater than a second set temperature, and obtaining a third judgment result;
step 105: if the third judgment result shows that the temperature of the flue gas after dust removal is greater than the first set temperature and the temperature of the insulator chamber 16 of the electric dust remover is greater than the second set temperature, the first isolation valve 13 is opened, the fourth isolation valve 25 is closed, the flue gas loop 1 operates, and the flow of the purging flue gas is regulated according to the signal of the first flowmeter 15;
step 106: if the second judgment result indicates that the boiler load is less than or equal to 20% of the rated boiler load, judging whether the blower 30 and the oxidation blower 21 are operated or not, and obtaining a fourth judgment result;
if the third judgment result indicates that the temperature of the flue gas after dust removal is less than or equal to the first set temperature or the temperature of the insulator chamber 16 of the electric dust remover is less than or equal to the second set temperature, judging whether the air blower 30 and the oxidation fan 21 are operated or not, and obtaining a fourth judgment result;
step 107: if the fourth judgment result shows that the blower 30 and the oxidation blower 21 are operated, the fourth isolation valve 25 is opened, the first isolation valve 13 is closed, the air circuit 2 is operated, and the temperature and the flow rate of hot air in the air circuit 2 are regulated according to the signals of the second temperature sensor 32 and the signals of the second flowmeter 26;
step 108: if the fourth judgment result indicates that the blower 30 and the oxidation blower 21 are not operated, judging whether the temperature of the flue gas after dust removal is higher than the first set temperature, and obtaining a fifth judgment result; if the fifth judgment result shows that the flue gas temperature is higher than the first set temperature, opening the first isolation valve 13, closing the fourth isolation valve 25, operating the flue gas loop 1, and adjusting the flow of the purging flue gas according to the signal of the first flowmeter 15;
step 109: if the fifth judgment result shows that the flue gas temperature is less than or equal to the first set temperature, the purging is not performed; if the first determination result indicates that the induced draft fan 12 is not operating, it indicates that no purging is performed.
In the above steps, the first set temperature is 120 ℃, and the second set temperature is 115 ℃.
The above is just one embodiment of the present invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.
Claims (8)
1. The purging device of the coal-fired power plant electric dust collector insulator chamber is characterized by comprising a flue gas loop, an air loop, a main flue gas pipeline and a control system;
the smoke loop comprises an electric dust collector body, an induced draft fan, an electric dust collector insulator chamber, a first air supply pipeline, an exhaust pipeline, a first temperature sensor, a second temperature sensor and a first isolation valve; the first temperature sensor is arranged on the main flue gas pipeline, the second temperature sensor is arranged in the insulator chamber of the electric dust collector, the first isolation valve is arranged on the first air supply pipeline, and the first isolation valve is controlled by the control system; the first temperature sensor and the second temperature sensor are in electrical signal connection with the control system;
the air loop comprises an oxidation fan, a blower, an air preheater, a cold and hot air mixing box, a second air supply pipeline, a third air supply pipeline, a fourth air supply pipeline and a fourth isolation valve; the fourth isolation valve is arranged on the fourth air supply pipeline and is controlled by the control system;
one end of the electric dust collector body is communicated with the main flue gas pipeline, the other end of the electric dust collector body is communicated with one end of the induced draft fan, the other end of the induced draft fan is communicated with the electric dust collector insulator chamber through the first air supply pipeline, one end of the exhaust pipeline is communicated with the electric dust collector insulator chamber, and the other end of the exhaust pipeline is communicated with the main flue gas pipeline; the oxidation fan is communicated with the cold and hot air mixing box through the second air supply pipeline, the air feeder is communicated with the air preheater, the air preheater is communicated with the cold and hot air mixing box through the third air supply pipeline, one end of the fourth air supply pipeline is connected with the cold and hot air mixing box, and the other end of the fourth air supply pipeline is communicated with the inlet end of the electric dust collector insulator chamber;
the flue gas loop further comprises a first flowmeter and a first regulating valve; the first flowmeter is arranged on the first air supply pipeline and is in electrical signal connection with the control system; the first regulating valve is arranged on the first air supply pipeline and is controlled by the control system;
the air circuit further comprises a second flowmeter arranged on the fourth air supply pipeline, and the second flowmeter is in electrical signal connection with the control system.
2. The purging device for an insulator chamber of an electric precipitator of a coal-fired power plant as set forth in claim 1, wherein said air circuit further comprises a second regulating valve disposed on said second air supply conduit, said second regulating valve being controlled by said control system.
3. The purging device for an insulator chamber of an electric precipitator for a coal-fired power plant as claimed in claim 2, wherein said air circuit further comprises a second isolation valve disposed on a second air supply conduit, said second isolation valve being located between said second regulator valve and said oxidation blower.
4. The purging device for an insulator chamber of an electric precipitator of a coal-fired power plant according to claim 1, wherein said air circuit further comprises a third regulating valve provided on said third air supply conduit, said third regulating valve being controlled by said control system.
5. The device for purging an insulator chamber of an electric precipitator for a coal-fired power plant as claimed in claim 4, wherein said air circuit further comprises a third isolation valve disposed on said third air supply conduit, said third isolation valve being located between a third regulating valve and an air preheater.
6. The purging device for an insulator compartment of an electric precipitator for a coal-fired power plant as claimed in claim 1, wherein the inner surfaces of said first air supply conduit and said air exhaust conduit are coated with an anti-corrosive layer.
7. The purging device for an insulator chamber of an electric precipitator of a coal-fired power plant according to claim 1, further comprising a non-return valve disposed on said exhaust conduit.
8. A method for purging by using the purging device for the insulator chamber of the electric precipitator of a coal-fired power plant according to any one of claims 1 to 7,
step 101: the control system acquires related signals, wherein the related signals comprise a boiler load value, whether a draught fan, a blower and an oxidation blower operate or not, a temperature signal of a first temperature sensor, a temperature signal of a second temperature sensor, and flow signals of a first flowmeter and a second flowmeter;
step 102: judging whether the induced draft fan operates according to the related signals to obtain a first judging result;
step 103: if the first judgment result indicates that the induced draft fan operates, judging whether the boiler load is greater than 20% of the rated load of the boiler, and obtaining a second judgment result;
step 104: if the second judgment result shows that the boiler load is greater than 20% of the rated load of the boiler, judging whether the temperature of the flue gas after dust removal is greater than a first set temperature and whether the temperature of an insulator chamber of the electric dust remover is greater than a second set temperature, and obtaining a third judgment result;
step 105: if the third judgment result shows that the temperature of the flue gas after dust removal is higher than the first set temperature and the temperature of the insulator chamber of the electric dust remover is higher than the second set temperature, the first isolation valve is opened, the fourth isolation valve is closed, the flue gas loop operates, and the flow of the purging flue gas is regulated according to the signal of the first flowmeter;
step 106: if the second judgment result shows that the boiler load is less than or equal to 20% of the rated load of the boiler, judging whether the blower and the oxidation blower operate or not, and obtaining a fourth judgment result;
if the third judgment result shows that the temperature of the flue gas after dust removal is less than or equal to the first set temperature or the temperature of an insulator chamber of the electric dust remover is less than or equal to the second set temperature, judging whether the air feeder and the oxidation fan operate or not, and obtaining a fourth judgment result;
step 107: if the fourth judgment result shows that the air feeder and the oxidation fan are operated, a fourth isolation valve is opened, the first isolation valve is closed, the air loop is operated, and the temperature and the flow of hot air in the air loop are regulated according to the signals of the second temperature sensor and the signals of the second flowmeter;
step 108: if the fourth judgment result indicates that the air feeder and the oxidation fan do not operate, judging whether the temperature of the flue gas after dust removal is higher than a first set temperature or not, and obtaining a fifth judgment result; if the fifth judgment result shows that the flue gas temperature is higher than the first set temperature, opening the first isolation valve, closing the fourth isolation valve, operating a flue gas loop, and adjusting the flow of the purging flue gas according to the signal of the first flowmeter;
step 109: if the fifth judging result shows that the flue gas temperature is less than or equal to the first set temperature, the purging is not performed; and if the first judgment result indicates that the induced draft fan does not operate, the induced draft fan does not purge.
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| CN201910186508.8A CN109821657B (en) | 2019-03-12 | 2019-03-12 | Purging device for insulator chamber of electric dust collector of coal-fired power plant |
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| CN201910186508.8A CN109821657B (en) | 2019-03-12 | 2019-03-12 | Purging device for insulator chamber of electric dust collector of coal-fired power plant |
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