CN102716639A - High-efficiency wet-type electric dust removal and desulfuration system and process - Google Patents
High-efficiency wet-type electric dust removal and desulfuration system and process Download PDFInfo
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- CN102716639A CN102716639A CN2012102526703A CN201210252670A CN102716639A CN 102716639 A CN102716639 A CN 102716639A CN 2012102526703 A CN2012102526703 A CN 2012102526703A CN 201210252670 A CN201210252670 A CN 201210252670A CN 102716639 A CN102716639 A CN 102716639A
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Abstract
The invention discloses a high-efficiency wet-type electric dust removal and desulfuration system and a process. A wet-type electric dust remover is arranged above a demister in a desulfuration tower. First of all, the demister is used for pre-removing mist drops and dust from clean smoke; the wet-type electric dust remover is used for performing fine treatment on the clean smoke; therefore, an extremely high environment-friendly discharging requirement is met; and the desulfuration efficiency is guaranteed, the efficiency of a dust removal system of the desulfuration tower is improved, and the dust discharge concentration at the outlet of the desulfuration tower is reduced, so that the latest discharge standard required in China is met. According to the wet-type electric dust remover, the problem of gypsum rain can be solved; various pollutants can be removed at the same time; furthermore, a water accumulation plate is arranged between the demister and the wet-type electric dust remover and used for collecting and recycling washing water of the wet-type electric dust remover, so that the washing water of the wet-type electric dust remover cannot directly enter into a neutralization oxidation pond of the desulfuration tower; and therefore, the water balance of the whole system is guaranteed.
Description
Technical field
The present invention relates to a kind of flue-gas dust-removing and desulfurization technology of wet desulfurization system, be specifically related to a kind of high-efficient wet-type electric precipitation desulphurization system and technology.
Background technology
The dust emission limit value of up-to-date thermal power plant's atmosphere pollutants emission standards (GB 13223-2011) is from original 50mg/m
3Change to 30mg/m
3, require the whole nation in 2012 to carry out less than 30mg/m
3Control criterion, the Changjiang river and the Delta of the Pearl River and area, Beijing-Tianjin Ji will be controlled at 20mg/m
3Below, and the control index of increase mercury and PM2.5 subparticle.
The dedusting technology of desulfurizer mainly contains at present: dry electric precipitation device, wet electrical dust precipitator and sack cleaner etc.
Wet electrical dust precipitator: wet electrical dust precipitator can be removed and be of a size of 0.01 micron so little particle, drop and mist, and efficient can reach more than 99.9%.But; The shortcoming of wet electrical dust precipitator is: consider that the pole plate current are even, resistance is higher, nozzle wear, obstruction, equipment corrosion, fouling; In addition, input cost is higher and sewage disposal is difficult, should not adopt for the flue gas condition of high dust concentration or high NOx concentration; Current, domestic power industry does not have practical application as yet.
The dry electric precipitation device: the dry electric precipitation device is used at most in power plant, also is the deduster that early begins to use.But; The shortcoming of dry electric precipitation device is: responsive especially to dust specific resistance, the most suitable is 106-1011 Ω cm than resistance, when than too high in resistance or cross and can cause that all efficiency of dust collection significantly descends when low; When this atomic thin light again powder of particularly high silicon high alumina exists in a large number, like SiO
2Add Al
2O
3Content surpass at 85% o'clock, because of it is again that insulator is higher especially than resistance, and be again fine dust Al
2O
3Toughness is prone to sticking electrode again, so efficiency of dust collection reduces more obvious.Implementing new standard (30mg/m
3) after, all be difficult to the discharge standard that reaches up-to-date even if the dry electric precipitation device is provided with 5,6 electric fields, and increase electric field and can increase follow-up desulphurization cost.
Sack cleaner: all in all sack cleaner has superiority satisfying in the environmental requirement, particularly can collect fine dust and heavy metal; Meet the development of environmental protection from now on emission request; But sack cleaner is had relatively high expectations to filter bag, at present, and outstanding problems such as the wearing and tearing of sack cleaner ubiquity, seriously corroded, life-span weak point, maintenance cost height; So far its domestic application achievement is less, and the problem that occurs is a lot.
In sum, the dedusting of present desulfurizer and droplet removal effect are relatively poor, can't satisfy the environment protection emission requirement.Under the up-to-date discharge standard of national requirements, be necessary very much to develop the high-effective dust-removing desulfur technology, improve the dust pelletizing system efficient of desulfurizer, reduce desulfurizer outlet dust emission concentration, to satisfy requirement on environmental protection, better living space is arranged to the mankind.
Summary of the invention
In view of this, the invention provides a kind of high-efficient wet-type electric precipitation desulphurization system and technology, when guaranteeing desulfuration efficiency, can improve the dust pelletizing system efficient of desulfurizing tower, reduce desulfurizing tower outlet dust emission concentration, reach the up-to-date discharge standard of national requirements.
The invention discloses a kind of high-efficient wet-type electric precipitation desulphurization system; Comprise desulfurizing tower; Said desulfurizing tower bottom is provided with smoke inlet, and top is provided with exhanst gas outlet, said desulfurizing tower inner bottom part be in and oxidation pond; Set gradually desulfurization uptake zone, demister and wet electrical dust precipitator from bottom to up between inner smoke inlet of said desulfurizing tower and the exhanst gas outlet, be communicated with the desulfurization uptake zone through circulating pump with oxidation pond in said.
Further; Also comprise cyclic water tank, flush water pump and be arranged on the ponding dish between inner demister of desulfurizing tower and the wet electrical dust precipitator; Be distributed with convexity on the card of said ponding dish; Convex top has smoke ventilator, and said ponding dish is communicated with cyclic water tank through the pipe-line system of catchmenting, and said cyclic water tank is through the flushing water system connectivity of flush water pump and wet electrical dust precipitator.
Further; Said cyclic water tank is made up of clarification water tank and flush box; Said clarification water tank is communicated with flush box through overfall; Said ponding dish is communicated with the clarification water tank through the pipe-line system of catchmenting, and said flush box is through the flushing water system connectivity of flush water pump and wet electrical dust precipitator, said clarification water tank bottom pass through waste water pump with in and oxidation pond be communicated with.
The invention also discloses the dust-removing and desulfurization process that uses above-mentioned high-efficient wet-type electric precipitation desulphurization system, former flue gas gets into desulfurizing tower from smoke inlet, then in the desulfurization uptake zone by desulfurization slurry absorbing and removing SO
2, behind the clean flue gas droplet that the removal of process demister is big earlier through the desulfurization uptake zone, getting into wet electrical dust precipitator again and remove drop and fine solid particle in the clean flue gas, last clean flue gas is discharged desulfurizing tower from exhanst gas outlet.
Further, the dust-containing water after the flushing water system of wet electrical dust precipitator washes wet electrical dust precipitator after the collection of ponding dish, gets into the clarification water tank through the pipe-line system of catchmenting; The clarification water tank bottom utilizes with oxidation pond in the dust-laden waste water of post precipitation is squeezed into by waste water pump again, and the primary water upper box part gets into flush box through the clear water overflow of post precipitation; Add in the flush box and be used for modified alkali lye of pH value and system consumption supplementing water, the water in the flush box uses through the flushing water systemic circulation that flush water pump is driven into wet electrical dust precipitator.
Beneficial effect of the present invention is:
1) the present invention has set up wet electrical dust precipitator above the demister in desulfurizing tower; At first utilize demister that droplet in the clean flue gas and dust are removed in advance; Utilize wet electrical dust precipitator to carry out precision processing again; Thereby reach very high environment protection emission requirement, can reach in the clean flue gas dust content usually at 30mg/m
3Below, therefore, the present invention has improved the dust pelletizing system efficient of desulfurizing tower when guaranteeing desulfuration efficiency, has reduced desulfurizing tower outlet dust emission concentration, has reached the up-to-date discharge standard of national requirements;
2) set up wet electrical dust precipitator after, can solve the problem that the gypsum rain band is come; Because conventional desulphurization system can't be tackled the droplet below the diameter 15 μ m, so gypsum rain is seriously polluted, sets up wet electrical dust precipitator and can remove ultra-fine grain, therefore can solve gypsum rain problem;
3) wet electrical dust precipitator has very strong trapping ability to tiny dust granules, droplet, aerosol, metallic particles etc., can realize that mercury, heavy metal and PM2.5 ultra-fine grain etc. remove uniting of multiple pollutant, and reduces chimney corrosion situation;
4) wet electrical dust precipitator of setting up is positioned at desulfurizing tower and desulfurizing tower entire arrangement, forms apparatus integration, saves floor space;
5) the present invention sets up the ponding dish between demister and wet electrical dust precipitator; Recycle behind the flushing water of ponding dish collection wet electrical dust precipitator; Guarantee the wet electrical dust precipitator flushing water directly do not get into desulfurizing tower in oxidation pond in, guaranteed the water balance of whole system.
Description of drawings
In order to make the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that the present invention is made further detailed description below, wherein:
Fig. 1 is a structural representation of the present invention.
The specific embodiment
Below will carry out detailed description to the preferred embodiments of the present invention with reference to accompanying drawing.
Fig. 1 is structural representation of the present invention, and is as shown in the figure, high-efficient wet-type electric precipitation desulphurization system of the present invention; Comprise desulfurizing tower 1; Said desulfurizing tower 1 bottom is provided with smoke inlet 2, and top is provided with exhanst gas outlet 3, said desulfurizing tower 1 inner bottom part be in oxidation pond 4; Set gradually desulfurization uptake zone 5, demister 6 and wet electrical dust precipitator 7 from bottom to up between said desulfurizing tower 1 inner smoke inlet 2 and the exhanst gas outlet 3, be communicated with desulfurization uptake zone 5 through circulating pump 8 with oxidation pond 4 in said.
In the present embodiment; Also comprise cyclic water tank, flush water pump 9 and be arranged on the ponding dish 10 between desulfurizing tower 1 inner demister 6 and the wet electrical dust precipitator 7; Be distributed with convexity on the card of said ponding dish 10; Convex top has smoke ventilator, and said ponding dish 10 is communicated with cyclic water tank through the pipe-line system 11 of catchmenting, and said cyclic water tank is communicated with the flushing water system 12 of wet electrical dust precipitator 7 through flush water pump 9; Flue gas can pass through from the smoke ventilator on the ponding dish 10; The flushing water of wet electrical dust precipitator 7 is then collected the back by ponding dish 10 and is got into circulation through the pipe-line system 11 of catchmenting; Guaranteed wet electrical dust precipitator 7 flushing waters directly do not get into desulfurizing tower 1 in oxidation pond 4 in, guaranteed the wet electrical dust precipitator of high water consumption and than the water balance between the desulphurization system of low water consumption.
In the present embodiment; Said cyclic water tank is made up of with flush box 14 clarification water tank 13; Said clarification water tank 13 is communicated with flush box 14 through overfall; Said ponding dish 10 is communicated with clarification water tank 13 through the pipe-line system 11 of catchmenting, and said flush box 14 is communicated with the flushing water system 12 of wet electrical dust precipitator 7 through flush water pump 9, said clarification water tank 13 bottoms pass through waste water pump 15 with in and oxidation pond 4 be communicated with; In order to guarantee wet electrical dust precipitator 7 circulation flushing water water quality, cyclic water tank is divided into clarification water tank 13 and flush box 14, help isolating the dust-laden waste water of high concentration on the one hand, be convenient to regulate water quality and moisturizing on the other hand.
Use the dust-removing and desulfurization process of high-efficient wet-type electric precipitation desulphurization system of the present invention, former flue gas gets into desulfurizing towers 1 from smoke inlet 2, then in desulfurization uptake zone 5 by desulfurization slurry absorbing and removing SO
2, behind the big droplet of clean flue gas process demister 6 removals earlier of desulfurization uptake zone 5, getting into wet electrical dust precipitator 7 again and remove drop and fine solid particle in the clean flue gas, last clean flue gas is discharged desulfurizing tower 1 from exhanst gas outlet 3; Desulfurization slurry in the desulfurization uptake zone 5 by circulating pump 8 from oxidation pond 4 in circulate and pump, desulfurization slurry can be processed by the desulfurizing agent that calcium base, magnesium base etc. is slightly soluble in water, desulfurization slurry absorbs SO in desulfurization uptake zone 5
2After fall into oxidation pond 4 in be oxidized to sulfate and crystallization, discharge through slurry pump 16 and handle.
Dust-containing water after 12 pairs of wet electrical dust precipitators 7 of the flushing water system of wet electrical dust precipitator 7 wash, after 10 collections of ponding dish, pipe-line system 11 gets into clarification water tanks 13 through catchmenting; Clarification water tank 13 bottoms utilize with oxidation pond 4 in the dust-laden waste water of post precipitation is squeezed into by waste water pump 15 again, and clarification water tank 13 tops get into flush box 14 through the clear water overflow of post precipitation; Add in the flush box 14 and be used for modified alkali lye of pH value and system consumption supplementing water, the water in the flush box 14 recycles through the flushing water system 12 that flush water pump 9 is driven into wet electrical dust precipitator 7.
The invention has the advantages that:
1) the present invention has set up wet electrical dust precipitator 7 above the demister 6 in desulfurizing tower 1; At first utilize droplet and dust in 6 pairs of clean flue gases of demister to remove in advance; Utilize wet electrical dust precipitator 7 to carry out precision processing again; Thereby reach very high environment protection emission requirement, can reach in the clean flue gas dust content usually at 30mg/m
3Below, therefore, the present invention has improved the dust pelletizing system efficient of desulfurizing tower when guaranteeing desulfuration efficiency, has reduced desulfurizing tower outlet dust emission concentration, has reached the up-to-date discharge standard of national requirements;
2) set up wet electrical dust precipitator 7 after, can solve the problem that the gypsum rain band is come; Because conventional desulphurization system can't be tackled the droplet below the diameter 15 μ m, so gypsum rain is seriously polluted, sets up wet electrical dust precipitator 7 and can remove ultra-fine grain, therefore can solve gypsum rain problem;
3) 7 pairs of tiny dust granules of wet electrical dust precipitator, droplet, aerosol, metallic particles etc. have very strong trapping ability, can realize that mercury, heavy metal and PM2.5 ultra-fine grain etc. remove uniting of multiple pollutant, and reduce chimney corrosion situation;
4) wet electrical dust precipitator of setting up 7 is positioned at desulfurizing tower 1 and desulfurizing tower 1 entire arrangement, forms apparatus integration, saves floor space;
5) the present invention sets up ponding dish 10 between demister 6 and wet electrical dust precipitator 7; Recycle behind the flushing water of ponding dish 10 collection wet electrical dust precipitators 7; Guarantee wet electrical dust precipitator 7 flushing waters directly do not get into desulfurizing tower 1 in oxidation pond 4 in, guaranteed the water balance of whole system.
Explanation is at last; Above embodiment is only unrestricted in order to technical scheme of the present invention to be described; Although through invention has been described with reference to the preferred embodiments of the present invention; But those of ordinary skill in the art should be appreciated that and can make various changes to it in form with on the details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (5)
1. high-efficient wet-type electric precipitation desulphurization system; Comprise desulfurizing tower; Said desulfurizing tower bottom is provided with smoke inlet, and top is provided with exhanst gas outlet, said desulfurizing tower inner bottom part be in and oxidation pond; It is characterized in that: set gradually desulfurization uptake zone, demister and wet electrical dust precipitator from bottom to up between inner smoke inlet of said desulfurizing tower and the exhanst gas outlet, be communicated with the desulfurization uptake zone through circulating pump with oxidation pond in said.
2. high-efficient wet-type electric precipitation desulphurization system according to claim 1; It is characterized in that: also comprise cyclic water tank, flush water pump and be arranged on the ponding dish between inner demister of desulfurizing tower and the wet electrical dust precipitator; Be distributed with convexity on the card of said ponding dish; Convex top has smoke ventilator, and said ponding dish is communicated with cyclic water tank through the pipe-line system of catchmenting, and said cyclic water tank is through the flushing water system connectivity of flush water pump and wet electrical dust precipitator.
3. high-efficient wet-type electric precipitation desulphurization system according to claim 2; It is characterized in that: said cyclic water tank is made up of clarification water tank and flush box; Said clarification water tank is communicated with flush box through overfall; Said ponding dish is communicated with the clarification water tank through the pipe-line system of catchmenting, and said flush box is through the flushing water system connectivity of flush water pump and wet electrical dust precipitator, said clarification water tank bottom pass through waste water pump with in and oxidation pond be communicated with.
4. use the dust-removing and desulfurization process of the described high-efficient wet-type electric precipitation of claim 3 desulphurization system, it is characterized in that: former flue gas gets into desulfurizing tower from smoke inlet, then in the desulfurization uptake zone by desulfurization slurry absorbing and removing SO
2, behind the clean flue gas droplet that the removal of process demister is big earlier through the desulfurization uptake zone, getting into wet electrical dust precipitator again and remove drop and fine solid particle in the clean flue gas, last clean flue gas is discharged desulfurizing tower from exhanst gas outlet.
5. dust-removing and desulfurization process according to claim 4 is characterized in that: the dust-containing water after the flushing water system of wet electrical dust precipitator washes wet electrical dust precipitator after the collection of ponding dish, gets into the clarification water tank through the pipe-line system of catchmenting; The clarification water tank bottom utilizes with oxidation pond in the dust-laden waste water of post precipitation is squeezed into by waste water pump again, and the primary water upper box part gets into flush box through the clear water overflow of post precipitation; Add in the flush box and be used for modified alkali lye of pH value and system consumption supplementing water, the water in the flush box uses through the flushing water systemic circulation that flush water pump is driven into wet electrical dust precipitator.
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| CN102764584A (en) * | 2012-08-14 | 2012-11-07 | 中电投远达环保工程有限公司 | Efficient wet type electrostatic-precipitation desulfurization system and process thereof |
| CN103056031A (en) * | 2012-12-31 | 2013-04-24 | 福建龙净环保股份有限公司 | Ash water circulation treatment system of wet-type electric dust remover |
| CN103055644A (en) * | 2012-12-31 | 2013-04-24 | 福建龙净环保股份有限公司 | Wet-type electric dust removal system after wet desulphurization |
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| CN103055644A (en) * | 2012-12-31 | 2013-04-24 | 福建龙净环保股份有限公司 | Wet-type electric dust removal system after wet desulphurization |
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| CN104208996A (en) * | 2014-06-16 | 2014-12-17 | 中电投远达环保工程有限公司 | Desulfurizing and dedusting apparatus |
| CN104100986A (en) * | 2014-07-09 | 2014-10-15 | 华电电力科学研究院 | Wet-type electric precipitator and wet desulphurization joint water system |
| CN104100986B (en) * | 2014-07-09 | 2016-08-31 | 华电电力科学研究院 | A kind of wet electrical dust precipitator and wet desulphurization united water system |
| CN106423559A (en) * | 2015-08-13 | 2017-02-22 | 白连福 | Novel electric precipitator |
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| CN105689138A (en) * | 2016-03-03 | 2016-06-22 | 福建紫荆环境工程技术有限公司 | Wet-type electric precipitator with multiple layers of cylinder electrodes |
| CN105854565A (en) * | 2016-06-01 | 2016-08-17 | 中电投远达环保工程有限公司 | Combined removal method for SO3 and Hg in flue gas of coal-fired power plant |
| CN106474908A (en) * | 2016-09-22 | 2017-03-08 | 上海交通大学 | A kind of flue gas desulfurization waste-water Zero discharging system and method |
| CN107158921A (en) * | 2017-07-10 | 2017-09-15 | 北京青山绿野环保科技有限公司 | A kind of ultra-clean exhaust system of coal burning flue gas desulfurization dedusting |
| CN108355457A (en) * | 2018-04-24 | 2018-08-03 | 青岛达能环保设备股份有限公司 | Wet desulfurization flue gas disappears white system |
| CN108970368A (en) * | 2018-10-09 | 2018-12-11 | 杭州蕴泽环境科技有限公司 | Zero water consume wet desulphurization device of one kind and its sulfur removal technology |
| WO2023005577A1 (en) * | 2021-07-30 | 2023-02-02 | 西安西热锅炉环保工程有限公司 | Flushing water recirculation system and method for mist eliminator |
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