CN104162486A - Method for synchronously removing sulfur dioxide and fine particles in smoke through electrical charge and mist spray - Google Patents
Method for synchronously removing sulfur dioxide and fine particles in smoke through electrical charge and mist spray Download PDFInfo
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- CN104162486A CN104162486A CN201310184334.4A CN201310184334A CN104162486A CN 104162486 A CN104162486 A CN 104162486A CN 201310184334 A CN201310184334 A CN 201310184334A CN 104162486 A CN104162486 A CN 104162486A
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- flue gas
- absorption liquid
- sulfur dioxide
- fine particle
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Abstract
The invention relates to a method for synchronously removing sulfur dioxide and fine particles in smoke through electrical charge and mist spray. The method performs pre-charge (positive charge) for absorption liquid through an external electrical charge spray gun, and uses compression molding air for spraying the absorption liquid input in the spray gun into a desulfurization tower in a mist manner; the mist drops of the absorption liquid with the positive charge are reacted with the sulfur dioxide in the smoke; and the fine particles in the smoke are captured through an electrical charge coagulation effect. The large drops in the desulfurization tower directly drop to the bottom of an absorption tower; the small drops are captured when entering a demisting device along with the smoke, and flow to the bottom of the desulfurization tower along the tower wall; and finally, the absorption liquid can be recycled after the regeneration treatment. The synchronous and efficiency removal of the sulfur dioxide and the fine particles in coal-fired flue gas can be realized through the method. Compared with the prior art, the method has such characteristics as high efficiency and low energy consumption.
Description
Technical field
The present invention relates to method and the device in a kind of purifying coal-fired flue gas field, is that a kind of electrostatic charged spray technology of utilizing is by sulfur dioxide in coal-fired flue-gas and synchronous method and the device of removing of fine particle.This method can realize synchronized desulfuring dedusting, non-secondary pollution problem.
Background technology
China is the country taking fire coal as main energy sources, and annual coal-fired consumption has exceeded 3,500,000,000 tons, and consequent sulfur dioxide and dust pollution are very serious.As one of the highest area of global fine particle, the pollution of the fine particle of China has caused showing great attention to of society, and " ambient air quality " that China revises is recently clearly to pollute fine particle as monitoring and evaluation object.Therefore, fine particle will become the main task of several years Air Pollution Control from now on, and its technical research and application will become one of most important work of atmosphere field of Environment Protection.
at present mainly rely on the equipment such as electrostatic precipitator, sack cleaner or electric-bag complex dust collector for the removal of particle in coal-fired flue-gas.Electrostatic precipitator is better to the larger flue dust removal effect of particle, but not ideal enough to the removal efficiency of fine particle.Sack cleaner has good removal effect to fine particle, but bag-type dusting deashing is frequent, reduces the service life of filter bag, and has increased the management difficulty of stable operation.The subject matter that electric-bag complex dust collector exists can solve preferably independent use electric cleaner or sack cleaner time.But existing electric-bag complex dust collector is still not high enough to the removal efficiency of fine particle, be difficult to meet the efficient technical need of controlling.And this type of cleaner is generally arranged on wet desulfurization system process section leading portion, although can effectively remove the fine particle in partial fuel coal flue gas, cannot control effectively for the fine particle discharge producing after wet desulphurization.
coal-burning power plant of China is furnished with wet method fume desulfurizing system mostly, can effectively remove meal dirt and SO 2 , but lower equally to the arresting efficiency of fine particle.And fine particle contacts with doctor solution in sweetening process, desulfurization product easily adsorbs fine particle surface, and changes the character of particle.Simultaneously due to effects such as reaction, evaporation, crystallization and trappings, also may make desulfurization after particle number concentrations increase, particle diameter distributes and also changes.Research shows to utilize after limestone-gypsum method or ammonia process wet desulphurization, and particle diameter section is between 0.03-0.01the fine grained of mm is counted concentration obviously to be increased, and this explanation has produced new particle in this sweetening process, and the new particle producing carries out desulfurizing tower with flue gas, causes fine grained in flue gas after desulfurization to count concentration increase.And the ammonia process of desulfurization is mainly due to having produced a large amount of aerosol particles, causing in flue gas after desulfurization fine grained to count concentration sharply increases.
Summary of the invention
Object of the present invention is exactly to provide the electrostatic charged spray that a kind of efficiency is high, cost is low FGD dust collection method in order to overcome the defect that above-mentioned prior art exists, and can realize the object of the synchronous removal to sulfur dioxide in coal-fired flue-gas and fine particle.
Object of the present invention can be achieved through the following technical solutions: a kind of electrostatic charged spray is synchronously removed the method for sulfur dioxide in flue gas and fine particle, it is characterized in that, the method comprises the following steps: absorption liquid is carried out charged in advance by external electrical field and spray gun, make adsorbent positively charged, and by the insulating properties playpipe that is connected with spray gun by the absorption liquid of positively charged with vaporific high velocity jet in wet flue gas desulfurization tower; Spray into absorption liquid droplet positively charged in flue gas due to two like magnetic poles repel each other, so can scatter very soon and fully mix with flue gas; The absorption liquid droplet of positively charged reacts with the sulfur dioxide in flue gas, carries out coalescence trapping by the fine particle in charging performance and the flue gas of absorption liquid droplet simultaneously, and it is separated from flue gas; Reacted droplet and being captured when by demister by the fine particle after coalescence, and condense into large drop, at the bottom of flowing to tower by guiding gutter along absorption tower wall; The absorption liquid of bottom, absorption tower is through precipitate and separate, and its supernatant can recycle after regeneration.
Described adsorption liquid is magnesia absorption liquid, and its concentration range is: 1-50 g/L.
Described external electrical field and spray gun are made up of the continuous supply unit of high voltage source, corona charging spray gun and the encapsulation adsorption liquid of positive polarity; Absorption liquid after charged, by the spray gun being distributed in desulfurizing tower, sprays in desulfurizing tower with vaporific by pressure-air, and the straying quatity of absorption liquid and flue gas flow ratio are 1-10L/m
3.
The voltage range of described high voltage source is between 20-100kV; The continuous supply unit of described encapsulation adsorption liquid is the jet pipe that insulate, and the material of this insulation jet pipe is pottery, polytetrafluoroethylene (PTFE) or macromolecular material and composite thereof.
The temperature range of described flue gas is 20-50 DEG C.
Absorption liquid droplet reacts with sulfur dioxide in absorption tower, and due to after charging characteristic and fine particle generation coalescence, is captured down, and condenses into drop and flow to bottom, absorption tower by tower wall during through demister; Absorption liquid can recycle after regeneration.
Utilize electrostatic charged spray method and magnesia to absorb sulfur dioxide and the fine particle technology combining, compared with prior art, the present invention has following advantages:
1, to adopt external electrical field and spray gun to carry out adsorbent charged in the present invention, substituted the nozzle in original spray absorber, do not change the physical dimension on absorption tower;
2, the positively charged absorption liquid droplet spraying, spraying and entering behind absorption tower, due to two like magnetic poles repel each other, so can very well be dispersed in flue gas, has improved the mixability of adsorption liquid and flue gas;
Due to positive charge, can there is charged coalescence effect with fine particle, and it is trapped in the absorption liquid droplet that 3, the present invention uses, improve the arresting efficiency of wet desulfurization system to fine particle;
4, absorption liquid used in the present invention, after demister trapping, can recycle, and operating cost is low.
Brief description of the drawings
Fig. 1 is electrostatic charged spray desulfation dust-extraction device schematic diagram.
in figure 1, desulfurizing tower, 2, absorption liquid sprayer, 3, compressed air reservoir, 4, air door, 5, high pressure airline, 6, demister, 7, power line, 8, high voltage source, 9, absorption liquid valve, 10, absorption liquid pipeline, 11, slush pump, 12, absorption liquid dosing pond, 13, regeneration of absorption solution pond.
Detailed description of the invention
As shown in Figure 1, first the absorbent preparing is placed in absorption liquid dosing pond (12), utilize slush pump (11) to be delivered to by absorption liquid pipeline (10) in the spray gun (2) of desulfurizing tower (1), utilize high voltage source 8 by absorbent charging, then utilize compressed air reservoir (3) that air is inputed in spray gun (2) by high pressure airline (5), and absorption liquid is sprayed in desulfurizing tower (1) with vaporific form by spray gun (2).Positively charged adsorption liquid droplet reacts with the sulfur dioxide in flue gas, and by charged coalescence effect, the fine particle in flue gas is trapped.Large drop in coalescence process can directly drop to absorption tower bottom, and tiny electrically charged drop is captured down during through demister (6), drops to bottom, absorption tower along Ta Bi.The absorption liquid of bottom, absorption tower is processed through regeneration of absorption solution pond (13), and supernatant flows into absorption liquid dosing pond (12), can recycle.
Utilize laboratory pilot-plant, structure as shown in Figure 1.Desulfurizing tower diameter is 250mm, tower height 3000mm, and using the discharge electrode structure of spray gun is single needle shape, supply voltage 0-80kV, charged electric current is 0-80 microampere, absorption liquid is 1-10L/m with exhaust gas volumn ratio
3(adjustable continuously).The adsorption liquid that utilizes the polyfluortetraethylene pipe of diameter 10mm that spray gun is sprayed sprays in desulfurizing tower.
Processing coal-fired flue-gas is 200m
3/ h, temperature 50 C, initial dust content is 1000mg/m
3.Utilize Electrical low pressure impactor (ELPI) to analyze total dust content and fine particle concentration in flue gas.In the time not enabling electrostatic charged spray device, find that by monitoring desulfurization front and back dust concentration drops to 210mg/m
3, wherein fine particle is about 70mg/m
3.Result shows, the efficiency of dust collection of spraying wet desulfurization system is about 80%, but the concentration of emission of fine particle is still higher.Pass through SO simultaneously
2concentration is monitored, and result shows that system desulfuration efficiency is about 85%.When starting electrostatic charged spray device, by voltage-regulation, to 50kV, through monitoring, the dust concentration after desulfurization drops to 65mg/m
3, and fine particle concentration is also down to 12mg/m
3, desulfuration efficiency has also reached 93%.Visible, utilize electrostatic charged spray device to improve system to flue gas SO
2removal efficiency with fine particle.
Claims (6)
1. an electrostatic charged spray is synchronously removed the method for sulfur dioxide in flue gas and fine particle, it is characterized in that, the method comprises the following steps: absorption liquid is carried out charged in advance by external electrical field and spray gun, make adsorbent positively charged, and by the insulating properties playpipe that is connected with spray gun by the absorption liquid of positively charged with vaporific high velocity jet in wet flue gas desulfurization tower; Spray into absorption liquid droplet positively charged in flue gas due to two like magnetic poles repel each other, so can scatter very soon and fully mix with flue gas; The absorption liquid droplet of positively charged reacts with the sulfur dioxide in flue gas, carries out coalescence trapping by the fine particle in charging performance and the flue gas of absorption liquid droplet simultaneously, and it is separated from flue gas; Reacted droplet and being captured when by demister by the fine particle after coalescence, and condense into large drop, at the bottom of flowing to tower by guiding gutter along absorption tower wall; The absorption liquid of bottom, absorption tower is through precipitate and separate, and its supernatant can recycle after regeneration.
2. a kind of electrostatic charged spray according to claim 1 is synchronously removed the method for sulfur dioxide in flue gas and fine particle, it is characterized in that, described adsorption liquid is magnesia absorption liquid, and its concentration range is: 1-50g/L.
3. a kind of electrostatic charged spray according to claim 1 is synchronously removed the method for sulfur dioxide in flue gas and fine particle, it is characterized in that, described external electrical field and spray gun are made up of the continuous supply unit of high voltage source, corona charging spray gun and the encapsulation adsorption liquid of positive polarity; Absorption liquid after charged, by the spray gun being distributed in desulfurizing tower, sprays in desulfurizing tower with vaporific by pressure-air, and the straying quatity of absorption liquid and flue gas flow ratio are 1-10L/m
3.
4. a kind of electrostatic charged spray according to claim 1 is synchronously removed the method for sulfur dioxide in flue gas and fine particle, it is characterized in that, the voltage range of described high voltage source is between 20-100kV; The continuous supply unit of described encapsulation adsorption liquid is the jet pipe that insulate, and the material of this insulation jet pipe is pottery, polytetrafluoroethylene (PTFE) or macromolecular material and composite thereof.
5. a kind of electrostatic charged spray according to claim 1 is synchronously removed the method for sulfur dioxide in flue gas and fine particle, it is characterized in that, the temperature range of described flue gas is 20-50 DEG C.
6. a kind of electrostatic charged spray according to claim 1 is synchronously removed the method for sulfur dioxide in flue gas and fine particle, it is characterized in that, absorption liquid droplet reacts with sulfur dioxide in absorption tower, and due to after charging characteristic and fine particle generation coalescence, during through demister, be captured down, and condense into drop and flow to absorption tower bottom by tower wall, absorption liquid can recycle after regeneration.
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| CN201310184334.4A CN104162486A (en) | 2013-05-20 | 2013-05-20 | Method for synchronously removing sulfur dioxide and fine particles in smoke through electrical charge and mist spray |
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| CN201310184334.4A CN104162486A (en) | 2013-05-20 | 2013-05-20 | Method for synchronously removing sulfur dioxide and fine particles in smoke through electrical charge and mist spray |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104525373A (en) * | 2014-12-05 | 2015-04-22 | 北京银河之舟环保科技有限公司 | Decontamination chamber and no-clean oil smoke purification system including the same |
| CN107198925A (en) * | 2017-06-29 | 2017-09-26 | 苏州艾特斯环保设备有限公司 | A kind of electrostatic charged spray device |
| CN107321500A (en) * | 2017-06-29 | 2017-11-07 | 苏州艾特斯环保设备有限公司 | Electrostatic spray deduster |
| CN107349729A (en) * | 2017-06-29 | 2017-11-17 | 苏州艾特斯环保设备有限公司 | A kind of electrostatic charged spray method |
| CN108310946A (en) * | 2018-03-05 | 2018-07-24 | 吉林建筑大学 | A kind of air contaminant treatment device |
| CN108636095A (en) * | 2018-07-27 | 2018-10-12 | 上海电力学院 | It is a kind of to integrate spraying, spray, charged flue gas desulfurization experiment device |
| CN109085101A (en) * | 2018-10-25 | 2018-12-25 | 浙江三尼科技有限公司 | A kind of flue gas soluble matter continuously monitors analysis method and system on-line |
| CN109174456A (en) * | 2018-08-23 | 2019-01-11 | 北京工业大学 | It is a kind of for being atomized the device and method of wet static dedusting |
| CN109432972A (en) * | 2019-01-02 | 2019-03-08 | 江苏龙净节能科技有限公司 | A kind of pre electrified desulfurizer |
| KR20190046068A (en) * | 2017-10-25 | 2019-05-07 | 주식회사 센트리 | Pollutant treating apparatus using electrospray |
| CN110573231A (en) * | 2017-03-03 | 2019-12-13 | 保罗·斯德丁 | Flue gas emission reduction technology |
| CN111228977A (en) * | 2020-03-19 | 2020-06-05 | 浙江嘉福新材料科技有限公司 | Sulfuric acid tail gas treatment device and treatment process |
| CN111773901A (en) * | 2020-06-08 | 2020-10-16 | 东南大学 | Chemical agglomeration wet desulphurization device capable of reducing generation of fine particulate matters |
| CN112933838A (en) * | 2021-02-05 | 2021-06-11 | 江苏金广恒工业设备制造有限公司 | Desulfurization and denitrification composite dedusting flue gas filtering device and filtering method thereof |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104525373A (en) * | 2014-12-05 | 2015-04-22 | 北京银河之舟环保科技有限公司 | Decontamination chamber and no-clean oil smoke purification system including the same |
| CN110573231A (en) * | 2017-03-03 | 2019-12-13 | 保罗·斯德丁 | Flue gas emission reduction technology |
| CN110573231B (en) * | 2017-03-03 | 2022-01-11 | 保罗·斯德丁 | Flue gas emission reduction technology |
| CN107198925A (en) * | 2017-06-29 | 2017-09-26 | 苏州艾特斯环保设备有限公司 | A kind of electrostatic charged spray device |
| CN107321500A (en) * | 2017-06-29 | 2017-11-07 | 苏州艾特斯环保设备有限公司 | Electrostatic spray deduster |
| CN107349729A (en) * | 2017-06-29 | 2017-11-17 | 苏州艾特斯环保设备有限公司 | A kind of electrostatic charged spray method |
| KR20190046068A (en) * | 2017-10-25 | 2019-05-07 | 주식회사 센트리 | Pollutant treating apparatus using electrospray |
| KR102024774B1 (en) * | 2017-10-25 | 2019-09-25 | 주식회사 센트리 | Pollutant treating apparatus using electrospray |
| CN108310946A (en) * | 2018-03-05 | 2018-07-24 | 吉林建筑大学 | A kind of air contaminant treatment device |
| CN108636095A (en) * | 2018-07-27 | 2018-10-12 | 上海电力学院 | It is a kind of to integrate spraying, spray, charged flue gas desulfurization experiment device |
| CN109174456A (en) * | 2018-08-23 | 2019-01-11 | 北京工业大学 | It is a kind of for being atomized the device and method of wet static dedusting |
| CN109085101A (en) * | 2018-10-25 | 2018-12-25 | 浙江三尼科技有限公司 | A kind of flue gas soluble matter continuously monitors analysis method and system on-line |
| CN109085101B (en) * | 2018-10-25 | 2024-03-22 | 浙江三尼科技有限公司 | Continuous online monitoring and analyzing method and system for smoke solubles |
| CN109432972A (en) * | 2019-01-02 | 2019-03-08 | 江苏龙净节能科技有限公司 | A kind of pre electrified desulfurizer |
| CN109432972B (en) * | 2019-01-02 | 2023-12-12 | 江苏龙净节能科技有限公司 | Pre-charged desulfurizing device |
| CN111228977A (en) * | 2020-03-19 | 2020-06-05 | 浙江嘉福新材料科技有限公司 | Sulfuric acid tail gas treatment device and treatment process |
| CN111773901A (en) * | 2020-06-08 | 2020-10-16 | 东南大学 | Chemical agglomeration wet desulphurization device capable of reducing generation of fine particulate matters |
| CN112933838A (en) * | 2021-02-05 | 2021-06-11 | 江苏金广恒工业设备制造有限公司 | Desulfurization and denitrification composite dedusting flue gas filtering device and filtering method thereof |
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Application publication date: 20141126 |
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