CN109647147B - Water optimization system and method for wet flue gas desulfurization device for efficient dust removal of thermal power plant - Google Patents

Water optimization system and method for wet flue gas desulfurization device for efficient dust removal of thermal power plant Download PDF

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CN109647147B
CN109647147B CN201910070039.3A CN201910070039A CN109647147B CN 109647147 B CN109647147 B CN 109647147B CN 201910070039 A CN201910070039 A CN 201910070039A CN 109647147 B CN109647147 B CN 109647147B
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flue gas
water
desulfurization
outlet
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CN109647147A (en
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卢剑
申建汛
王正江
许臻
王璟
杨宝红
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Xian Thermal Power Research Institute Co Ltd
Huaneng Power International Inc
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Xian Thermal Power Research Institute Co Ltd
Huaneng Power International Inc
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    • B01D—SEPARATION
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
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    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
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Abstract

The invention discloses a water optimizing system and a water optimizing method for a wet flue gas desulfurization device for efficiently removing dust in a thermal power plant.A flue gas pipeline at a boiler outlet is communicated with a flue gas inlet of a desulfurization absorption tower, and a spray layer, a first layer of flushing water pipe, a first layer of ridge type demister, a second layer of flushing water pipe, a third layer of flushing water pipe, a second layer of ridge type demister and a fourth layer of flushing water pipe are sequentially arranged in the desulfurization absorption tower from bottom to top; the outlet of the oxidation fan and the inlet of the spraying layer are both communicated with a slurry pool at the bottom of the desulfurization absorption tower, and the chimney is communicated with a flue gas outlet at the top of the desulfurization absorption tower, so that the system and the method can improve the reuse water ratio of the power plant and can meet the condition that the smoke concentration value at the outlet of the chimney is lower than 5mg/Nm 3 Is environment-friendly and has lower cost.

Description

Water optimization system and method for wet flue gas desulfurization device for efficient dust removal of thermal power plant
Technical Field
The invention belongs to the field of energy conservation and environmental protection, and relates to a water optimization system and method for a wet flue gas desulfurization device for efficiently removing dust in a thermal power plant.
Background
The national pollution control of the atmosphere is very important, the emission standard of the flue gas of the power plant is regulated, and the flue gas and SO (sulfur dioxide) are treated 2 NOx, mercury emissions concentrations are severely limited. Therefore, part of coal-fired unit power plants in China also adopt more economic and stable flue gas cooperative treatment technology to meet the environmental protection requirement. The technical route of the flue gas cooperative treatment is as follows: flue Gas Cooler (FGC) +low-temperature electric precipitator (ESP) +limestone-gypsum wet flue gas desulfurization device (FGD) +chimney with high-efficiency dust removal. The process route can lead the smoke emission concentration value at the outlet of the chimney to be less than 10mg/Nm 3 By arranging a wet electric dust collector behind a limestone-gypsum wet flue gas desulfurization device (FGD) with high-efficiency dust removal, the concentration value of smoke at the outlet of a chimney can be less than 5mg/Nm 3 . However, most of the power plants except the newly built unit are additionally provided with wet electric dust collectors, which are faced with the problems of narrow transformation space, high transformation cost and the like, and severely restrict the smoke dust concentration at the outlet of the power plant chimney to meet stricter environmental protection requirements.
In addition, according to research, a wet desulfurization device (FGD) with high-efficiency dust removal is taken as the last link of a flue gas collaborative treatment technical route, and most of power plants are used for ensuring that the concentration of flue dust at a chimney outlet reaches the standard, and industrial water of the power plants is taken as water for washing a demister, so that the desulfurization system of the power plants cannot fully utilize reuse water of the power plants, the reuse water rate of water resources of the power plants is greatly reduced, and certain high-quality low-use phenomenon exists in the water.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provideWater optimization system and method for wet flue gas desulfurization device for efficient dust removal of thermal power plant, and the system and method can improve reuse water ratio of power plant and meet that smoke concentration value at chimney outlet is lower than 5mg/Nm 3 Is environment-friendly and has lower cost.
In order to achieve the purpose, the water optimizing system for the wet flue gas desulfurization device for the high-efficiency dust removal of the thermal power plant comprises a boiler outlet flue gas pipeline, a desulfurization absorption tower, a reuse water system, a desulfurization industrial water system, an oxidation fan and a chimney;
the flue gas pipeline at the outlet of the boiler is communicated with the flue gas inlet of the desulfurization absorption tower, a spray layer, a first layer of flushing water pipe, a first layer of ridge demister, a second layer of flushing water pipe, a third layer of flushing water pipe, a second layer of ridge demister and a fourth layer of flushing water pipe are sequentially arranged in the desulfurization absorption tower from bottom to top, wherein the outlet of the reuse water system is communicated with the inlet of the first layer of flushing water pipe, the inlet of the second layer of flushing water pipe and the inlet of the third layer of flushing water pipe, and the outlet of the desulfurization industrial water system is communicated with the inlet of the fourth layer of flushing water pipe;
the outlet of the first layer of flushing water pipe is opposite to the lower surface of the first layer of ridge type demister, the outlet of the second layer of flushing water pipe is opposite to the upper surface of the first layer of ridge type demister, the outlet of the third layer of flushing water pipe is opposite to the lower surface of the second layer of ridge type demister, and the outlet of the fourth layer of flushing water pipe is opposite to the upper surface of the second layer of ridge type demister;
the outlet of the oxidation fan and the inlet of the spraying layer are both communicated with a slurry pool at the bottom of the desulfurization absorption tower, and the chimney is communicated with a flue gas outlet at the top of the desulfurization absorption tower.
The flue gas pipeline at the outlet of the boiler is communicated with the flue gas inlet of the desulfurization absorption tower through the denitration device, the flue gas cooler and the low-temperature electrostatic precipitator in sequence.
The inlet of the spray layer is communicated with a slurry pool at the bottom of the desulfurization absorption tower through a circulating pump.
The desulfurization absorption tower also comprises a limestone slurry tank and a slurry pump, wherein the outlet of the limestone slurry tank is communicated with the limestone slurry inlet of the desulfurization absorption tower through the slurry pump.
The desulfurization industrial water system comprises a desulfurization industrial water tank and a flushing water industrial water pump, wherein an outlet of the desulfurization industrial water tank is communicated with a water inlet of a fourth-layer flushing water pipe through the flushing water industrial water pump.
The reuse water system comprises a reuse water tank, wherein the outlet of the reuse water tank is communicated with the water inlet of the first layer of flushing water pipe, the water inlet of the second layer of flushing water pipe and the water inlet of the third layer of flushing water pipe through an oil removal filter, a desulfurization process water tank and a flushing water process water pump, and the oil drain port of the oil removal filter is communicated with an oil collecting tank.
The device also comprises a control valve, wherein two ends of the control valve are respectively communicated with an outlet of the flushing water process water pump and an outlet of the flushing water industrial water pump.
The system also comprises a gypsum discharge pump and a gypsum dehydration system, wherein the inlet of the gypsum dehydration system is communicated with a slurry pool at the bottom of the desulfurization absorption tower through the gypsum discharge pump.
The water optimization method for the wet flue gas desulfurization device for efficiently removing dust in the thermal power plant comprises the following steps:
the nitrogen oxides in the flue gas output by the flue gas pipeline at the outlet of the boiler are removed by the denitration device, and simultaneously, SO in the flue gas is inhibited by utilizing the mercury oxidation catalyst in the denitration device 2 Conversion to SO 3 And Hg in the flue gas is removed 0 Oxidation to divalent mercury Hg 2+ After the flue gas output by the denitration device is cooled by a flue gas cooler, the particle size of smoke dust in the flue gas is increased, and part of SO in the flue gas is increased 3 The flue gas is adsorbed on the flue dust, and the flue gas treated by the flue gas cooler enters a low-temperature electrostatic precipitator for dust removal and then enters a desulfurization absorption tower;
in the desulfurization absorption tower, the flue gas is washed in a countercurrent mode by the circulating limestone slurry sprayed by the spraying layer to remove the residual SO in the flue gas 3 、SO 2 HCl and HF, then move upwards to pass through the first layer ridge type demister and the second layer ridge type demister in sequence so as to remove liquid drops carried in the flue gas, and finally enter a chimney and are discharged through the chimney;
after the first-layer ridge type demister and the second-layer ridge type demister work for a set time, starting a desulfurization industrial water system and a multiplexing water system, wherein desulfurization industrial water output by the desulfurization industrial water system is sprayed onto the upper surface of the second-layer ridge type demister through a fourth-layer flushing water pipe, multiplexing water output by the multiplexing water system is divided into three paths, the first path is sprayed onto the lower surface of the second-layer ridge type demister through a third-layer flushing water pipe, the second path is sprayed onto the upper surface of the first-layer ridge type demister through a second-layer flushing water pipe, the third path is sprayed onto the lower surface of the first-layer ridge type demister through the first-layer flushing water pipe, so that cleaning of the first-layer ridge type demister and the second-layer ridge type demister is achieved, and meanwhile, the multiplexing water and the desulfurization industrial water of the washed power plant serve as make-up water of a desulfurization absorption tower to drop into a slurry pool at the bottom of the desulfurization absorption tower.
The invention has the following beneficial effects:
according to the water optimizing system and method for the wet flue gas desulfurization device for efficiently removing dust in the thermal power plant, disclosed by the invention, when the water optimizing system and method for the wet flue gas desulfurization device for efficiently removing dust in the thermal power plant are specifically operated, the water using mode and the demister mode of the traditional wet flue gas desulfurization device are abandoned, the existing equipment of the thermal power plant is fully utilized, the existing demister is replaced by the first-layer ridge type demister and the second-layer ridge type demister, particles in flue gas are removed by utilizing the first-layer ridge type demister and the second-layer ridge type demister, the influence of the environment is avoided, and the condition that the smoke concentration value of a chimney outlet is lower than 5mg/Nm is met 3 The environmental protection requirement of the flue gas desulfurization tower is avoided, the wet electrostatic dust collector is additionally arranged behind the desulfurization absorption tower to ensure that the flue gas emission particulate matter reaches the standard, and the high equipment cost and the maintenance cost of later operation are avoided, so that the economic benefit is obvious. In addition, when the demister is washed, the traditional mode of using fresh water only is avoided, the upper surface and the lower surface of the first-layer ridge type demister at the lower layer and the lower surface of the second-layer ridge type demister at the upper layer are washed by the reuse water of a power plant, the upper surface of the second-layer ridge type demister is washed by desulfurization industrial water, meanwhile, desulfurization industrial water washed by the second-layer ridge type demister moves from top to bottom, the step utilization of desulfurization industrial water is realized while the second washing of the first-layer ridge type demister is realized, and in addition, the washing is realizedThe washed desulfurization industrial water and the power plant reuse water are taken as the supplementing water of the desulfurization absorption tower to fall into a slurry pool at the bottom of the desulfurization absorption tower, so that the purposes of saving water and reducing emission of the thermal power plant are achieved, and the reuse water rate of the power plant is improved.
In addition, two ends of the control valve are respectively communicated with the outlet of the flushing water process water pump and the outlet of the flushing water industrial water pump, so that the flushing water source can be flexibly switched according to the working condition requirement.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The boiler comprises a boiler outlet flue gas pipeline 1, a denitration device 2, a flue gas cooler 3, a low-temperature electrostatic precipitator 4, a desulfurization absorption tower 5, a spray layer 6, a circulating pump 7, an oxidation fan 8, a slurry pump 9, a limestone slurry tank 10, a gypsum discharge pump 11, a gypsum dehydration system 12, a first-layer ridge type demister 13, a second-layer ridge type demister 14, a first-layer flushing water pipe 15, a second-layer flushing water pipe 16, a third-layer flushing water pipe 17, a fourth-layer flushing water pipe 18, a flushing water industrial water pump 19, a flushing water industrial water pump 20, a desulfurization industrial water tank 21, a desulfurization process water tank 22, a control valve 23, an oil removal filter 24, a multiplexing water tank 25, a oil collecting tank 26 and a chimney 27.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
referring to fig. 1, the water optimizing system for the wet flue gas desulfurization device for high-efficiency dust removal of the thermal power plant comprises a boiler outlet flue gas pipeline 1, a desulfurization absorption tower 5, a multiplexing water system, a desulfurization industrial water system, an oxidation fan 8 and a chimney 27; the boiler outlet flue gas pipeline 1 is communicated with a flue gas inlet of the desulfurization absorption tower 5, a spray layer 6, a first layer of flushing water pipe 15, a first layer of ridge type demister 13, a second layer of flushing water pipe 16, a third layer of flushing water pipe 17, a second layer of ridge type demister 14 and a fourth layer of flushing water pipe 18 are sequentially arranged in the desulfurization absorption tower 5 from bottom to top, wherein an outlet of the multiplexing water system is communicated with an inlet of the first layer of flushing water pipe 15, an inlet of the second layer of flushing water pipe 16 and an inlet of the third layer of flushing water pipe 17, and an outlet of the desulfurization industrial water system is communicated with an inlet of the fourth layer of flushing water pipe 18; the outlet of the first layer of flushing water pipe 15 is opposite to the lower surface of the first layer of ridge type demister 13, the outlet of the second layer of flushing water pipe 16 is opposite to the upper surface of the first layer of ridge type demister 13, the outlet of the third layer of flushing water pipe 17 is opposite to the lower surface of the second layer of ridge type demister 14, and the outlet of the fourth layer of flushing water pipe 18 is opposite to the upper surface of the second layer of ridge type demister 14; the outlet of the oxidation fan 8 and the inlet of the spraying layer 6 are both communicated with a slurry pool at the bottom of the desulfurization absorption tower 5, and the chimney 27 is communicated with a flue gas outlet at the top of the desulfurization absorption tower 5.
The flue gas pipeline 1 at the outlet of the boiler is communicated with the flue gas inlet of the desulfurization absorption tower 5 through the denitration device 2, the flue gas cooler 3 and the low-temperature electrostatic precipitator 4 in sequence; the inlet of the spray layer 6 is communicated with a slurry pool at the bottom of the desulfurization absorption tower 5 through a circulating pump 7.
The invention also comprises a limestone slurry tank 10 and a slurry pump 9, wherein the outlet of the limestone slurry tank 10 is communicated with the limestone slurry inlet of the desulfurization absorption tower 5 through the slurry pump 9.
The desulfurization industrial water system comprises a desulfurization industrial water tank 21 and a flushing water industrial water pump 19, wherein an outlet of the desulfurization industrial water tank 21 is communicated with a water inlet of a fourth-layer flushing water pipe 18 through the flushing water industrial water pump 19; the reuse water system comprises a reuse water tank 25, wherein the outlet of the reuse water tank 25 is communicated with the water inlet of the first layer of flushing water pipe 15, the water inlet of the second layer of flushing water pipe 16 and the water inlet of the third layer of flushing water pipe 17 through an oil removal filter 24, a desulfurization process water tank 22 and a flushing water process water pump 20, and the oil drain port of the oil removal filter 24 is communicated with an oil collecting tank 26.
The invention further comprises a control valve 23, wherein two ends of the control valve 23 are respectively communicated with the outlet of the flushing water process water pump 20 and the outlet of the flushing water industrial water pump 19.
The invention also comprises a gypsum discharge pump 11 and a gypsum dewatering system 12, wherein the inlet of the gypsum dewatering system 12 is communicated with a slurry pool at the bottom of the desulfurization absorption tower 5 through the gypsum discharge pump 11.
The water optimization method for the wet flue gas desulfurization device for efficiently removing dust in the thermal power plant comprises the following steps:
the flue gas output by the flue gas pipeline 1 at the outlet of the boiler passes through the denitration device 2 to remove nitrogen oxides therein, and simultaneously, mercury oxidation catalyst in the denitration device 2 is utilized to inhibit SO in the flue gas 2 Conversion to SO 3 Simultaneously Hg in the flue gas 0 Oxidation to divalent mercury Hg 2 + After the flue gas output by the denitration device 2 is cooled by the flue gas cooler 3, the particle size of smoke dust in the flue gas is increased, and part of SO in the flue gas is increased 3 Adsorbed on the smoke dust, and simultaneously the granular mercury and the bivalent mercury Hg 2+ The flue gas is adsorbed, neutralized and removed by ash particles, so that the flue gas is removed in the low-temperature electrostatic precipitator 4 and the desulfurization absorption tower 5, and the flue gas treated by the flue gas cooler 3 enters the low-temperature electrostatic precipitator 4 for dedusting and then enters the desulfurization absorption tower 5;
in the desulfurization absorption tower 5, the flue gas is washed in a countercurrent mode by the circulating limestone slurry sprayed by the spraying layer 6 SO as to remove the residual SO in the flue gas 3 、SO 2 HCl and HF, then move upwards and pass through the first roof-ridge demister 13 and the second roof-ridge demister 14 in sequence to remove liquid drops carried in the flue gas, finally enter a chimney 27 and are discharged through the chimney 27, meanwhile, air output by an oxidation fan 8 enters a slurry pond to oxidize reaction byproducts into gypsum, and then enter a gypsum dewatering system 12 through a gypsum discharge pump 11 to carry out dewatering treatment;
after the first roof-ridge demister 13 and the second roof-ridge demister 14 work for a set time, starting a desulfurization industrial water system and a multiplexing water system, wherein the desulfurization industrial water output by the desulfurization industrial water system is sprayed onto the upper surface of the second roof-ridge demister 14 through a fourth flushing water pipe 18, the multiplexing water output by the multiplexing water system is divided into three paths, the first path is sprayed onto the lower surface of the second roof-ridge demister 14 through a third flushing water pipe 17, the second path is sprayed onto the upper surface of the first roof-ridge demister 13 through a second flushing water pipe 16, the third path is sprayed onto the lower surface of the first roof-ridge demister 13 through a first flushing water pipe 15, so that the cleaning of the first roof-ridge demister 13 and the second roof-ridge demister 14 is realized, and the multiplexing water and the desulfurization industrial water after flushing are used as make-up water of the desulfurization absorption tower 5 to drop into a slurry pool at the bottom of the desulfurization absorption tower 5.
In addition, the water quality of the flushing water of the second-layer ridge type demister 14 is good, the flushing water after flushing of the second-layer ridge type demister 14 falls onto the first-layer ridge type demister 13 from top to bottom, and secondary flushing of the first-layer ridge type demister 13 is realized, so that step utilization of desulfurization industrial water in a demister system is realized; the flushing water of the first-layer ridge demister 13 and the second-layer ridge demister 14 finally falls as make-up water into the slurry pool at the bottom of the desulfurization absorption tower 5 to maintain the water balance of the desulfurization system.
In order to ensure that the reuse water of the power plant can meet the requirement of demister flushing water, the reuse water rate of the power plant is improved, and meanwhile, the particulate matters at the smoke outlet meet environmental protection indexes, the reuse water of the power plant is filtered and deoiled by utilizing the deoiling filter 24, and the reuse water of the power plant is filtered, and meanwhile, the organic matters and the solid content in the water are removed, so that the reuse water of the power plant can stably meet the requirement of demister flushing water, and the reuse water of the power plant is not influenced by the environment. Meanwhile, the oil dirt collected by the oil removal filter 24 is discharged to the oil collecting tank 26 and finally sent to a coal yard for blending burning, so that the recycling utilization is realized.

Claims (6)

1. The water optimizing system for the wet flue gas desulfurization device for efficiently removing dust in the thermal power plant is characterized by comprising a boiler outlet flue gas pipeline (1), a desulfurization absorption tower (5), a multiplexing water system, a desulfurization industrial water system, an oxidation fan (8) and a chimney (27);
the boiler outlet flue gas pipeline (1) is communicated with a flue gas inlet of the desulfurization absorption tower (5), a spray layer (6), a first layer of flushing water pipe (15), a first layer of ridge type demister (13), a second layer of flushing water pipe (16), a third layer of flushing water pipe (17), a second layer of ridge type demister (14) and a fourth layer of flushing water pipe (18) are sequentially arranged in the desulfurization absorption tower (5) from bottom to top, wherein an outlet of the reuse water system is communicated with an inlet of the first layer of flushing water pipe (15), an inlet of the second layer of flushing water pipe (16) and an inlet of the third layer of flushing water pipe (17), and an outlet of the desulfurization industrial water system is communicated with an inlet of the fourth layer of flushing water pipe (18);
the outlet of the first layer of flushing water pipe (15) is opposite to the lower surface of the first layer of ridge type demister (13), the outlet of the second layer of flushing water pipe (16) is opposite to the upper surface of the first layer of ridge type demister (13), the outlet of the third layer of flushing water pipe (17) is opposite to the lower surface of the second layer of ridge type demister (14), and the outlet of the fourth layer of flushing water pipe (18) is opposite to the upper surface of the second layer of ridge type demister (14);
the outlet of the oxidation fan (8) and the inlet of the spraying layer (6) are both communicated with a slurry pool at the bottom of the desulfurization absorption tower (5), and the chimney (27) is communicated with a flue gas outlet at the top of the desulfurization absorption tower (5);
the device also comprises a limestone slurry tank (10) and a slurry pump (9), wherein the outlet of the limestone slurry tank (10) is communicated with the limestone slurry inlet of the desulfurization absorption tower (5) through the slurry pump (9);
the desulfurization industrial water system comprises a desulfurization industrial water tank (21) and a flushing water industrial water pump (19), wherein an outlet of the desulfurization industrial water tank (21) is communicated with a water inlet of a fourth-layer flushing water pipe (18) through the flushing water industrial water pump (19);
the reuse water system comprises a reuse water tank (25), an outlet of the reuse water tank (25) is communicated with a water inlet of a first layer of flushing water pipe (15), a water inlet of a second layer of flushing water pipe (16) and a water inlet of a third layer of flushing water pipe (17) through an oil removal filter (24), a desulfurization process water tank (22) and a flushing water process water pump (20), and an oil drain port of the oil removal filter (24) is communicated with an oil collecting tank (26).
2. The water optimization system for the wet flue gas desulfurization device for efficiently removing dust in the thermal power plant according to claim 1, wherein the flue gas pipeline (1) at the outlet of the boiler is communicated with the flue gas inlet of the desulfurization absorption tower (5) through the denitration device (2), the flue gas cooler (3) and the low-temperature electrostatic precipitator (4) in sequence.
3. The water optimizing system for the wet flue gas desulfurization device for efficiently removing dust in the thermal power plant according to claim 1, wherein the inlet of the spraying layer (6) is communicated with a slurry pool at the bottom of the desulfurization absorption tower (5) through a circulating pump (7).
4. The water optimizing system for the wet flue gas desulfurization device for efficiently removing dust in a thermal power plant according to claim 1, further comprising a control valve (23), wherein both ends of the control valve (23) are respectively communicated with an outlet of a flushing water process water pump (20) and an outlet of a flushing water process water pump (19).
5. The water optimizing system for the wet flue gas desulfurization device for efficiently removing dust in the thermal power plant according to claim 1, further comprising a gypsum discharge pump (11) and a gypsum dehydration system (12), wherein an inlet of the gypsum dehydration system (12) is communicated with a slurry pool at the bottom of the desulfurization absorption tower (5) through the gypsum discharge pump (11).
6. The water optimization method for the wet flue gas desulfurization device for efficiently removing dust in the thermal power plant is characterized by comprising the following steps of:
the flue gas output by the flue gas pipeline (1) at the outlet of the boiler passes through the denitration device (2) to remove nitrogen oxides therein, and simultaneously, mercury oxidation catalyst in the denitration device (2) is utilized to inhibit SO in the flue gas 2 Converts into SO3 and converts Hg in the flue gas 0 Oxidation to divalent mercury Hg 2 After the flue gas output by the denitration device (2) is cooled by the flue gas cooler (3), the particle size of smoke dust in the flue gas is increased, and part of SO in the flue gas is increased 3 The flue gas is adsorbed on the flue dust, and the flue gas treated by the flue gas cooler (3) enters a low-temperature electrostatic precipitator (4) for dedusting and then enters a desulfurization absorption tower (5);
in the desulfurization absorption tower (5), the flue gas is washed in a countercurrent mode by the circulating limestone slurry sprayed by the spraying layer (6) to remove the residual SO in the flue gas 3 、SO 2 HCl and HF, then move upwards to pass through the first layer ridge type demister (13) and the second layer ridge type demister (14) in sequence to remove the carried in the flue gasFinally, the liquid drops enter a chimney (27) and are discharged through the chimney (27);
after the first roof-ridge demister (13) and the second roof-ridge demister (14) work for a set time, starting a desulfurization industrial water system and a multiplexing water system, wherein desulfurization industrial water output by the desulfurization industrial water system is sprayed onto the upper surface of the second roof-ridge demister (14) through a fourth flushing water pipe (18), multiplexing water output by the multiplexing water system is divided into three paths, the first path is sprayed onto the lower surface of the second roof-ridge demister (14) through a third flushing water pipe (17), the second path is sprayed onto the upper surface of the first roof-ridge demister (13) through a second flushing water pipe (16), the third path is sprayed onto the lower surface of the first roof-ridge demister (13) through a first flushing water pipe (15), so that the first roof-ridge demister (13) and the second roof-ridge demister (14) are cleaned, and the multiplexing water of the power plant after flushing and the industrial water drop into water pond (5) at the bottom of a desulfurization absorber (5) as water replenishing water pond.
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