CN102764584A - Efficient wet type electrostatic-precipitation desulfurization system and process thereof - Google Patents
Efficient wet type electrostatic-precipitation desulfurization system and process thereof Download PDFInfo
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- CN102764584A CN102764584A CN2012102878702A CN201210287870A CN102764584A CN 102764584 A CN102764584 A CN 102764584A CN 2012102878702 A CN2012102878702 A CN 2012102878702A CN 201210287870 A CN201210287870 A CN 201210287870A CN 102764584 A CN102764584 A CN 102764584A
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Abstract
The invention discloses an efficient wet type electrostatic-precipitation desulfurization system and a process thereof. A wet electrostatic precipitator is used for replacing an existing demister in a desulfurization tower. The wet electrostatic precipitator has more powerful capability and higher efficiency in removal of liquid drops and fine dust in flue gas than the demister, so that the wet electrostatic precipitator achieves high environmental protection discharge requirements, guarantees the desulfurization efficiency, and improves the efficiency of a dust removal system of a desulfurization tower, reduces the discharge concentration of dust at an outlet of the desulfurization tower and achieves the latest discharge standard required by the nation. By means of replacing the demister with the wet electrostatic precipitator, the gypsum rain problem is solved, and joint removal of various pollutants is achieved. Further, a water collection disc is added between a desulfurization absorption area and the wet electrostatic precipitator; as the water collection disc collects flushing water of the wet electrostatic precipitator for recycling, the flushing water of the wet electrostatic precipitator is prevented from entering a neutralization oxidation pond of the desulfurization tower directly, and 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; Between inner smoke inlet of said desulfurizing tower and the exhanst gas outlet desulfurization uptake zone and wet electrical dust precipitator are set, and wet electrical dust precipitator is positioned at top, desulfurization uptake zone, is 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 desulfurization uptake zone 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.
Further, also be communicated with oxidation air system and plasma discharge system respectively with oxidation pond in said.
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
2Desulfurization slurry absorbs SO
2After fall into oxidation pond in, provide oxygen to carry out oxidation reaction by the oxidation air system and generate sulfate and crystallization, after the plasma discharge system discharge and handle; Clean flue gas entering wet electrical dust precipitator through the desulfurization uptake zone removes drop and fine solid particle in the clean flue gas, and 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 utilizes wet electrical dust precipitator to replace existing demister in desulfurizing tower; It is stronger that wet electrical dust precipitator removes in the clean flue gas ability of drop and fine solid particle; Therefore efficient is higher, has reached 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) after wet electrical dust precipitator replaces demister, can solve the problem that the gypsum rain band is come; Because in the conventional desulphurization system, demister can't be tackled the droplet below the diameter 15 μ m, so gypsum rain is seriously polluted, wet electrical dust precipitator can be removed 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 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 desulfurization uptake zone 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 a structural representation of the present invention; As shown in the figure, high-efficient wet-type electric precipitation desulphurization system of the present invention comprises desulfurizing tower 1; Said desulfurizing tower 1 bottom is provided with smoke inlet 2; Top is provided with exhanst gas outlet 3, said desulfurizing tower 1 inner bottom part be in oxidation pond 4, desulfurization uptake zone 5 and wet electrical dust precipitator 7 are set between said desulfurizing tower 1 inner smoke inlet 2 and the exhanst gas outlet 3; And wet electrical dust precipitator 7 is positioned at 5 tops, desulfurization uptake zone, is 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 desulfurization uptake zone 5 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.
In the present embodiment, also be communicated with oxidation air system 6 and plasma discharge system 16 respectively with oxidation pond 4 in said.
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
2Desulfurization slurry absorbs SO
2After fall into oxidation pond 4 in, provide oxygen to carry out oxidation reaction by oxidation air system 6 and generate sulfate and crystallization, after plasma discharge system 16 discharge and handle; Clean flue gas entering wet electrical dust precipitator 7 through the desulfurization uptake zone removes drop and fine solid particle in the clean flue gas, and last clean flue gas is discharged desulfurizing towers 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.
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 utilizes wet electrical dust precipitator 7 to replace existing demister in desulfurizing tower 1; It is stronger that wet electrical dust precipitator 7 removes in the clean flue gas ability of drop and fine solid particle; Efficient is higher; Therefore reached 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) after wet electrical dust precipitator 7 replaces demister, can solve the problem that the gypsum rain band is come; Because in the conventional desulphurization system, demister can't be tackled the droplet below the diameter 15 μ m, so gypsum rain is seriously polluted, wet electrical dust precipitator 7 can be removed 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 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 desulfurization uptake zone 5 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 (6)
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: between inner smoke inlet of said desulfurizing tower and the exhanst gas outlet desulfurization uptake zone and wet electrical dust precipitator are set, and wet electrical dust precipitator is positioned at top, desulfurization uptake zone, is 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 desulfurization uptake zone 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. high-efficient wet-type electric precipitation desulphurization system according to claim 3 is characterized in that: also be communicated with oxidation air system and plasma discharge system respectively with oxidation pond in said.
5. use the dust-removing and desulfurization process of the described high-efficient wet-type electric precipitation of claim 4 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
2Desulfurization slurry absorbs SO
2After fall into oxidation pond in, provide oxygen to carry out oxidation reaction by the oxidation air system and generate sulfate and crystallization, after the plasma discharge system discharge and handle; Clean flue gas entering wet electrical dust precipitator through the desulfurization uptake zone removes drop and fine solid particle in the clean flue gas, and last clean flue gas is discharged desulfurizing tower from exhanst gas outlet.
6. dust-removing and desulfurization process according to claim 5 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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CN104190543A (en) * | 2014-08-20 | 2014-12-10 | 浙江天蓝环保技术股份有限公司 | Wet-type electric precipitator and electric precipitation desulfurization device comprising same |
CN104259001A (en) * | 2014-09-05 | 2015-01-07 | 山东华泰环保设备有限公司 | Vertical square tube wet electrostatic precipitator |
CN105126516A (en) * | 2015-08-17 | 2015-12-09 | 中国重型机械研究院股份公司 | Cylindrical vertical-type wet-type explosion-proof compression-resistant desulphurizing and dedusting device |
CN106000069A (en) * | 2016-07-15 | 2016-10-12 | 国电环境保护研究院 | Cellular gas-lifting and flow-equalizing partitioned liquid collection device |
CN106076081A (en) * | 2016-08-08 | 2016-11-09 | 辽宁信威环保科技有限公司 | The ultra-clean desulfurization integrated device of wet electrostatic |
CN106925431A (en) * | 2015-12-29 | 2017-07-07 | 青岛道空优科技有限公司 | A kind of heavy metal adsorption cleaning system |
CN111359420A (en) * | 2020-04-22 | 2020-07-03 | 上海环境工程设计研究院有限公司 | Deacidifying, cooling, water-saving and dedusting integrated device and working method thereof |
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CN111672632A (en) * | 2020-08-13 | 2020-09-18 | 广东科霖环保设备有限公司 | Wet-type electrostatic precipitator equipment |
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CN104190543A (en) * | 2014-08-20 | 2014-12-10 | 浙江天蓝环保技术股份有限公司 | Wet-type electric precipitator and electric precipitation desulfurization device comprising same |
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CN104259001A (en) * | 2014-09-05 | 2015-01-07 | 山东华泰环保设备有限公司 | Vertical square tube wet electrostatic precipitator |
CN105126516A (en) * | 2015-08-17 | 2015-12-09 | 中国重型机械研究院股份公司 | Cylindrical vertical-type wet-type explosion-proof compression-resistant desulphurizing and dedusting device |
CN106925431A (en) * | 2015-12-29 | 2017-07-07 | 青岛道空优科技有限公司 | A kind of heavy metal adsorption cleaning system |
CN106000069A (en) * | 2016-07-15 | 2016-10-12 | 国电环境保护研究院 | Cellular gas-lifting and flow-equalizing partitioned liquid collection device |
CN106076081A (en) * | 2016-08-08 | 2016-11-09 | 辽宁信威环保科技有限公司 | The ultra-clean desulfurization integrated device of wet electrostatic |
CN111359420A (en) * | 2020-04-22 | 2020-07-03 | 上海环境工程设计研究院有限公司 | Deacidifying, cooling, water-saving and dedusting integrated device and working method thereof |
CN111672633A (en) * | 2020-08-13 | 2020-09-18 | 广东科霖环保设备有限公司 | Dust remover box structure of electric dust remover |
CN111672632A (en) * | 2020-08-13 | 2020-09-18 | 广东科霖环保设备有限公司 | Wet-type electrostatic precipitator equipment |
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