CN102764584B - Efficient wet type electrostatic-precipitation desulfurization process - Google Patents

Efficient wet type electrostatic-precipitation desulfurization process Download PDF

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Publication number
CN102764584B
CN102764584B CN201210287870.2A CN201210287870A CN102764584B CN 102764584 B CN102764584 B CN 102764584B CN 201210287870 A CN201210287870 A CN 201210287870A CN 102764584 B CN102764584 B CN 102764584B
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water
desulfurization
wet electrical
electrical dust
dust precipitator
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CN201210287870.2A
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Chinese (zh)
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CN102764584A (en
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唐小健
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中电投远达环保工程有限公司
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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

High-efficient wet-type electric precipitation sulfur removal technology

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 sulfur removal technology.

Background technology

The dust emission limit value of up-to-date fossil-fuel power plant atmospheric pollutant emission standard (GB 13223-2011) is from original 50mg/m 3change to 30mg/m 3, require that the whole nation in 2012 is carried out and be less than 30mg/m 3control criterion, the Changjiang river and the Delta of the Pearl River and Beijing-tianjin-hebei Region will control at 20mg/m 3below, and increase the Con trolling index of mercury and PM2.5 subparticle.

The dedusting technology of current desulfurizer mainly contains: dry electric precipitation device, wet electrical dust precipitator and sack cleaner etc.

Wet electrical dust precipitator: wet electrical dust precipitator can remove the particle, drop and the mist that are of a size of 0.01 micron little like this, and efficiency can reach more than 99.9%.But, the shortcoming of wet electrical dust precipitator is: consider that pole plate uniform fluid flow, resistance are higher, nozzle wear, blocking, equipment corrosion, fouling, in addition, higher and the waste water treatmentntrol difficult of input cost, flue gas condition for high dust concentration or high NOx concentration should not adopt, current, domestic electrical industry not yet has practical application.

Dry electric precipitation device: dry electric precipitation device in power plant's application at most, is also the deduster comparatively early starting to apply.But, the shortcoming of dry electric precipitation device is: responsive especially to dust specific resistance, and the most applicable ratio resistance is 106-1011 Ω cm, and efficiency of dust collection all can be caused when ratio resistance is too high or too low significantly to decline, when particularly this atomic thin powder light again of high silicon high alumina exists in a large number, as SiO 2add Al 2o 3content more than 85% time, because it is again that insulator ratio resistance is high especially, and be again fine dust Al 2o 3toughness easily sticky electrode again, so efficiency of dust collection reduces more obvious.At enforcement new standard (30mg/m 3) after, be all difficult to reach up-to-date discharge standard even if dry electric precipitation device arranges 5,6 electric fields, and increase electric field can increase follow-up desulphurization cost.

Sack cleaner: on sack cleaner Full toe ring guaranteed request, all in all comparatively have superiority, particularly can collect fine dust and heavy metal, meet the development of environmental protection from now on emission request, but the requirement of sack cleaner to filter bag is higher, at present, the wearing and tearing of sack cleaner ubiquity, seriously corroded, the outstanding problem such as the life-span is short, maintenance cost is high, so far application achievement is at home less, and produced problem is a lot.

In sum, dedusting and the droplet removal effect of current desulfurizer are poor, cannot meet environment protection emission requirement.Under the up-to-date discharge standard of national requirements, be necessary very much exploitation high-effective dust-removing desulfur technology, improve the dust pelletizing system efficiency of desulfurizer, reduce desulfurizer outlet dust emission concentration, to meet the requirement of environmental protection, have better living space to the mankind.

Summary of the invention

In view of this, the invention provides a kind of high-efficient wet-type electric precipitation sulfur removal technology, while guarantee desulfuration efficiency, the dust pelletizing system efficiency of desulfurizing tower can be improved, 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, described desulfurizing tower bottom is provided with smoke inlet, top is provided with exhanst gas outlet, described desulfurizing tower inner bottom part be in and oxidation pond, between described desulfurizing tower inside smoke entrance and exhanst gas outlet, desulfurization uptake zone and wet electrical dust precipitator are set, and wet electrical dust precipitator is positioned at above desulfurization uptake zone, is communicated with in described with oxidation pond by circulating pump with desulfurization uptake zone.

Further, also comprise cyclic water tank, flush water pump and be arranged on the water accumulating disc between the inner desulfurization uptake zone of desulfurizing tower and wet electrical dust precipitator, the card of described water accumulating disc is distributed with projection, convex top has smoke ventilator, described water accumulating disc is communicated with cyclic water tank by collecting conduit system, and described cyclic water tank is by the flushing water system connectivity of flush water pump and wet electrical dust precipitator.

Further, described cyclic water tank is by clarifying water tank and flush box forms, described clarification water tank is communicated with flush box by overfall, described water accumulating disc is communicated with clarification water tank by collecting conduit system, described flush box by the flushing water system connectivity of flush water pump and wet electrical dust precipitator, described clarification water tank bottom by waste water pump with in be communicated with oxidation pond.

Further, oxidation air system and plasma discharge system is also communicated with respectively with oxidation pond in described.

The invention also discloses the dust-removing and desulfurization process using above-mentioned high-efficient wet-type electric precipitation desulphurization system, former flue gas enters desulfurizing tower from smoke inlet, then in desulfurization uptake zone, is desulfurized slurries absorbing and removing SO 2; Desulfurization slurry absorbs SO 2after fall into and in oxidation pond, provide oxygen to carry out oxidation reaction by oxidation air system and generate sulfate crystallization, discharge finally by plasma discharge system and process; Neat stress through desulfurization uptake zone enters wet electrical dust precipitator and removes drop in neat stress and fine solid particle, and last neat stress discharges desulfurizing tower from exhanst gas outlet.

Further, the flushing water system of wet electrical dust precipitator wet electrical dust precipitator is rinsed after dust-containing water, after being collected by water accumulating disc, enter clarification water tank through collecting conduit system; Clarification water tank bottom dust-laden waste water after precipitation recycles with oxidation pond in being squeezed into by waste water pump, and primary water upper box part clean water overflow after precipitation enters flush box; Add for the modified alkali lye of pH value and system consumption supplementing water in flush box, the flushing water systemic circulation that the water in flush box is driven into wet electrical dust precipitator by flush water pump uses.

Beneficial effect of the present invention is:

1) the present invention utilizes wet electrical dust precipitator to replace existing demister in desulfurizing tower, the ability that wet electrical dust precipitator removes drop and fine solid particle in neat stress is stronger, efficiency is higher, therefore reaches very high environment protection emission requirement, usually can to reach in neat stress dust content at 30mg/m 3below, therefore, the present invention, while guarantee desulfuration efficiency, improves the dust pelletizing system efficiency of desulfurizing tower, reduces desulfurizing tower outlet dust emission concentration, reaches the up-to-date discharge standard of national requirements;

2), after wet electrical dust precipitator replaces demister, the problem that gypsum rain brings can be solved; Due in the desulphurization system of routine, the droplet of demister to diameter less than 15 μm cannot be tackled, and therefore gypsum rain is seriously polluted, and wet electrical dust precipitator 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 mercury, heavy metal and PM2.5 ultra-fine grain etc. and remove combining of multiple pollutant, and reduce chimney corrosion condition;

4) wet electrical dust precipitator is positioned at desulfurizing tower, and desulfurizing tower integral arrangement, and forming apparatus integration, saves floor space;

5) the present invention sets up water accumulating disc between desulfurization uptake zone and wet electrical dust precipitator, water accumulating disc recycles after collecting the flushing water of wet electrical dust precipitator, ensure that wet electrical dust precipitator flushing water does not directly enter in desulfurizing tower and in oxidation pond, ensure that the water balance of whole system.

Accompanying drawing explanation

In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:

Fig. 1 is structural representation of the present invention.

Detailed description of the invention

Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.

Fig. 1 is structural representation of the present invention, as shown in the figure, high-efficient wet-type electric precipitation desulphurization system of the present invention, comprise desulfurizing tower 1, described desulfurizing tower 1 bottom is provided with smoke inlet 2, top is provided with exhanst gas outlet 3, described desulfurizing tower 1 inner bottom part be in and oxidation pond 4, between described desulfurizing tower 1 inside smoke entrance 2 and exhanst gas outlet 3, desulfurization uptake zone 5 and wet electrical dust precipitator 7 are set, and wet electrical dust precipitator 7 is positioned at above desulfurization uptake zone 5, is communicated with in described with oxidation pond 4 by circulating pump 8 with desulfurization uptake zone 5.

In the present embodiment, also comprise cyclic water tank, flush water pump 9 and be arranged on the water accumulating disc 10 between the inner desulfurization uptake zone 5 of desulfurizing tower 1 and wet electrical dust precipitator 7, the card of described water accumulating disc 10 is distributed with projection, convex top has smoke ventilator, described water accumulating disc 10 is communicated with cyclic water tank by collecting conduit system 11, and described cyclic water tank is communicated with the flushing water system 12 of wet electrical dust precipitator 7 by flush water pump 9; Flue gas can pass through from the smoke ventilator water accumulating disc 10, the flushing water of wet electrical dust precipitator 7 enters circulation by collecting conduit system 11 after then being collected by water accumulating disc 10, ensure that wet electrical dust precipitator 7 flushing water directly not to enter in desulfurizing tower 1 and in oxidation pond 4, ensure that high water consumption wet electrical dust precipitator and compared with low water consumption desulphurization system between water balance.

In the present embodiment, described cyclic water tank is by clarifying water tank 13 and flush box 14 forms, described clarification water tank 13 is communicated with flush box 14 by overfall, described water accumulating disc 10 is communicated with clarification water tank 13 by collecting conduit system 11, described flush box 14 is communicated with the flushing water system 12 of wet electrical dust precipitator 7 by flush water pump 9, bottom described clarification water tank 13 by waste water pump 15 with in be communicated with oxidation pond 4; In order to ensure wet electrical dust precipitator 7 circulating flushing wash water water quality, cyclic water tank being divided into clarification water tank 13 and flush box 14, being conducive to the dust-laden waste water isolating high concentration on the one hand, be convenient to regulating water quality and moisturizing on the other hand.

In the present embodiment, in described, be also communicated with oxidation air system 6 and plasma discharge system 16 respectively with oxidation pond 4.

Use the dust-removing and desulfurization process of high-efficient wet-type electric precipitation desulphurization system of the present invention, former flue gas enters desulfurizing tower 1 from smoke inlet 2, then in desulfurization uptake zone 5, is desulfurized slurries absorbing and removing SO 2; Desulfurization slurry absorbs SO 2after fall into and in oxidation pond 4, provide oxygen to carry out oxidation reaction by oxidation air system 6 and generate sulfate crystallization, discharge finally by plasma discharge system 16 and process; Neat stress through desulfurization uptake zone enters wet electrical dust precipitator 7 and removes drop in neat stress and fine solid particle, and last neat stress discharges desulfurizing tower 1 from exhanst gas outlet 3; Desulfurization slurry in desulfurization uptake zone 5 by circulating pump 8 from and circulate and pump in oxidation pond 4, the desulfurizing agent that desulfurization slurry can be slightly soluble in water by calcium base, magnesium base etc. is made.

Dust-containing water after flushing water system 12 pairs of wet electrical dust precipitators 7 of wet electrical dust precipitator 7 rinse, after being collected, enters clarification water tank 13 through collecting conduit system 11 by water accumulating disc 10; During bottom clarification water tank 13, dust-laden waste water is after precipitation squeezed into by waste water pump 15 and oxidation pond 4 recycle, clarification water tank 13 top clean water overflow after precipitation enters flush box 14; Add for the modified alkali lye of pH value and system consumption supplementing water in flush box 14, the flushing water system 12 that the water in flush box 14 is driven into wet electrical dust precipitator 7 by flush water pump 9 recycles.

The invention has the advantages that:

1) the present invention utilizes wet electrical dust precipitator 7 to replace existing demister in desulfurizing tower 1, the ability that wet electrical dust precipitator 7 removes drop and fine solid particle in neat stress is stronger, efficiency is higher, therefore reach very high environment protection emission requirement, usually can to reach in neat stress dust content at 30mg/m 3below, therefore, the present invention, while guarantee desulfuration efficiency, improves the dust pelletizing system efficiency of desulfurizing tower, reduces desulfurizing tower outlet dust emission concentration, reaches the up-to-date discharge standard of national requirements;

2), after wet electrical dust precipitator 7 replaces demister, the problem that gypsum rain brings can be solved; Due in the desulphurization system of routine, the droplet of demister to diameter less than 15 μm cannot be tackled, and therefore gypsum rain is seriously polluted, and wet electrical dust precipitator 7 can remove ultra-fine grain, therefore can solve gypsum rain problem;

3) wet electrical dust precipitator 7 has very strong trapping ability to tiny dust granules, droplet, aerosol, metallic particles etc., can realize mercury, heavy metal and PM2.5 ultra-fine grain etc. and remove combining of multiple pollutant, and reduce chimney corrosion condition;

4) wet electrical dust precipitator 7 is positioned at desulfurizing tower 1, and desulfurizing tower 1 integral arrangement, and forming apparatus integration, saves floor space;

5) the present invention sets up water accumulating disc 10 between desulfurization uptake zone 5 and wet electrical dust precipitator 7, water accumulating disc 10 recycles after collecting the flushing water of wet electrical dust precipitator 7, ensure that wet electrical dust precipitator 7 flushing water does not directly enter in desulfurizing tower 1 and in oxidation pond 4, ensure that the water balance of whole system.

What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by referring to the preferred embodiments of the present invention, invention has been described, but those of ordinary skill in the art is to be understood that, various change can be made to it in the form and details, and not depart from the spirit and scope of the present invention that appended claims limits.

Claims (2)

1. a high-efficient wet-type electric precipitation sulfur removal technology, its desulphurization system comprises desulfurizing tower, described desulfurizing tower bottom is provided with smoke inlet, top is provided with exhanst gas outlet, described desulfurizing tower inner bottom part be in and oxidation pond, between described desulfurizing tower inside smoke entrance and exhanst gas outlet, desulfurization uptake zone and wet electrical dust precipitator are set, and wet electrical dust precipitator is positioned at above desulfurization uptake zone, be communicated with desulfurization uptake zone by circulating pump with oxidation pond in described, also comprise cyclic water tank, flush water pump and the water accumulating disc be arranged between the inner desulfurization uptake zone of desulfurizing tower and wet electrical dust precipitator, the card of described water accumulating disc is distributed with projection, convex top has smoke ventilator, described water accumulating disc is communicated with cyclic water tank by collecting conduit system, described cyclic water tank is by the flushing water system connectivity of flush water pump and wet electrical dust precipitator, described cyclic water tank is by clarifying water tank and flush box forms, described clarification water tank is communicated with flush box by overfall, described water accumulating disc is communicated with clarification water tank by collecting conduit system, described flush box by the flushing water system connectivity of flush water pump and wet electrical dust precipitator, described clarification water tank bottom by waste water pump with in be communicated with oxidation pond, oxidation air system and plasma discharge system is also communicated with respectively with oxidation pond in described, it is characterized in that: former flue gas enters desulfurizing tower from smoke inlet, then in desulfurization uptake zone, be desulfurized slurries absorbing and removing SO 2, desulfurization slurry absorbs SO 2after fall into and in oxidation pond, provide oxygen to carry out oxidation reaction by oxidation air system and generate sulfate crystallization, discharge finally by plasma discharge system and process, neat stress through desulfurization uptake zone enters wet electrical dust precipitator and removes drop in neat stress and fine solid particle, and last neat stress discharges desulfurizing tower from exhanst gas outlet.
2. high-efficient wet-type electric precipitation sulfur removal technology according to claim 1, is characterized in that: the flushing water system of wet electrical dust precipitator wet electrical dust precipitator is rinsed after dust-containing water, after being collected by water accumulating disc, enter clarification water tank through collecting conduit system; Clarification water tank bottom dust-laden waste water after precipitation recycles with oxidation pond in being squeezed into by waste water pump, and primary water upper box part clean water overflow after precipitation enters flush box; Add for the modified alkali lye of pH value and system consumption supplementing water in flush box, the flushing water systemic circulation that the water in flush box is driven into wet electrical dust precipitator by flush water pump uses.
CN201210287870.2A 2012-08-14 2012-08-14 Efficient wet type electrostatic-precipitation desulfurization process CN102764584B (en)

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CN104190543B (en) * 2014-08-20 2016-09-07 浙江天蓝环保技术股份有限公司 A kind of wet electrical dust precipitator and comprise the electric precipitation desulfurizer of this wet electrical dust precipitator
CN104259001B (en) * 2014-09-05 2017-09-26 佛山市绿动力环保科技有限公司 Vertical square tube wet electrical dust 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
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
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

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