CN102764574A - Desulfurization and denitrification method for streamer discharge plasma free radical injected flue gas - Google Patents
Desulfurization and denitrification method for streamer discharge plasma free radical injected flue gas Download PDFInfo
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- CN102764574A CN102764574A CN2012102450333A CN201210245033A CN102764574A CN 102764574 A CN102764574 A CN 102764574A CN 2012102450333 A CN2012102450333 A CN 2012102450333A CN 201210245033 A CN201210245033 A CN 201210245033A CN 102764574 A CN102764574 A CN 102764574A
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- flue gas
- free radical
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Abstract
The invention discloses a desulfurization and denitrification method for streamer discharge plasma free radical injected flue gas. The method comprises the following steps of: 1) discharging oxygen or air to produce plasma free radicals by using a streamer discharge plasma reactor; 2) injecting the gas containing the plasma free radicals into a flue, and mixing the gas and flue gas containing sulfur oxides and nitrogen oxides, wherein the sulfur oxides and the nitrogen oxides in the flue gas are converted into high-valent oxides by the plasma free radicals; 3) delivering the flue gas in the last step to a desulfurization tower for circular spraying absorption, so that the sulfur oxides and the nitrogen oxides enter a liquid phase; and 4) demisting the flue gas subjected to the circular spraying absorption, and discharging through a chimney. The method has synchronous desulfurization and denitrification capability; a catalyst and a special reaction temperature requirement are not required in the denitrification process; desulfurization and denitrification are integrated, so that the investment is low, and a small space is occupied; and the system is low in resistance and low in energy consumption.
Description
Technical field
The present invention relates to the desulfurization denitration method that a kind of corona plasma free radical injects flue gas.
Background technology
Coal accounts for more than 75% in the primary energy total quantity consumed of China, and coal has produced a large amount of sulfur dioxide, nitrogen oxide in combustion process, forms acid rain, and photochemical fog etc. cause atmosphere pollution." the for the first time national pollution sources generaI investigation communique " announced on February 6th, 2010 according to Chinese Ministry of Environmental Protection shows 2,320 ten thousand tons of 2007 annual SO2 emissions, 1797.7 ten thousand tons of nitrogen oxide.Expect the energy demand of the year two thousand twenty China and might reach 3,000,000,000 tons to 3,400,000,000 tons mark coals; The sulfur dioxide of power plant emission, flue dust, nitrogen oxide will reach 2,100 ten thousand tons, 5,000,000 tons, 1,200 ten thousand tons, and the discharging that exceeds the quata of these pollutants is annual to be caused direct economic loss to reach more than 1,100 hundred million yuan and be to country to increase trend year by year.
At present; Domestic flue gas desulfurization is main with the lime stone gypsum wet mainly, but along with large quantities of lime stone gypsum wet desulfurizer puts into operation, has produced a large amount of desulfurated plasters; Expect 2011; The desulfurated plaster that China stores up will further cause desulfurated plaster and pile up the situation that causes secondary pollution above 1.5 hundred million tons with other gypsum by-products, and this just need introduce new technology of preparing for the almost single lime stone gypsum wet technology of domestic big generator set desulfurization.And for NO
XControl method mainly contain before the burning two kinds of controls and burning back control.Control mainly is low nitrogen burning technology before the burning, through improving the generation that fired state and fuel denitrogenation reduce nitrogen oxide, like the use of boiler for low nitrogen oxide etc.; But because some control combustion process NO
XThe technology that generates often reduces the thermal efficiency, and incomplete combustion loss increases, and equipment scale also increases thereupon, and NO
XReduction limited.The control of burning back mainly is: technology such as selective catalytic reduction (SCR), SNCR method (SNCR).There is the expensive and poisoning easily of catalyst in the SCR technology, and operating cost is too high; Form sulfate occluding devices such as sulfate of ammoniac; Ammonia leaks and forms secondary pollution problems.The required temperature of SNCR reaction do not need catalyst, but reducing agent consumption is big, denitration efficiency is not high more than 900 ℃, also exists ammonia to leak, produce N simultaneously
2Secondary pollution such as O, CO problem.
Along with the formal enforcement of the new thermal power plant's atmosphere pollutants emission standards (GB13223-2011) issued of national environmental protection portion, more strict to the discharge standard of sulfur dioxide, nitrogen oxide.In order better to prevent and treat the pollution that steam power plant's discharging causes, protect living environment and ecological environment, improve environmental quality.The flue gas desulfurization and denitrification technology of research and development advanced technology, technical maturity increases the selection of technological adaptability, overcomes the defective of prior art, has important and far-reaching meaning.
Summary of the invention
The purpose of this invention is to provide the desulfurization denitration method that a kind of corona plasma free radical injects flue gas.
The technical scheme that the present invention taked is:
A kind of corona plasma free radical injects the desulfurization denitration method of flue gas, may further comprise the steps:
1) utilize the streamer-discahrge plasma reactor that oxygen or air are carried out discharge generation plasma free radical;
The gas that 2) will contain the plasma free radical injects flue, mixes with the flue gas of sulfur-containing oxide, nitrogen oxide, and the plasma free radical makes the oxysulfide in the flue gas, the oxide that nitrogen oxide changes higher valence state into;
3) flue gas that will go up the step is sent into desulfurizing tower and is carried out circulated sprinkling and absorb, and makes oxysulfide, nitrogen oxide get into liquid phase;
4) the flue gas process demist of process circulated sprinkling absorption is after smoke stack emission.
Be provided with negative electrode and anode in the described streamer-discahrge plasma reactor.
The power supply that described streamer-discahrge plasma reactor adopts is the AC/DC power supply.
It is alkaline absorbent that circulated sprinkling absorbs used absorbent.
Described alkaline absorbent comprises ammoniacal liquor, NaOH, calcium hydroxide, calcium oxide.
The invention has the beneficial effects as follows: the ability that 1, has synchronized desulfuring and denitrifying;
2, denitrification process need not catalyst, no special reaction temperature requirement;
4, desulfurization and denitrification integral, invest low, take up an area of little;
5, SR is little, and energy consumption is low.
Description of drawings
Fig. 1 is the schematic representation of apparatus that the present invention relates to.
The specific embodiment
Below in conjunction with specific embodiment the present invention is done further explanation:
Embodiment 1:
As shown in Figure 1, a kind of corona plasma free radical injects the desulfurization denitration method of flue gas, comprises the steps: to pass through flue through the boiler smoke 1 of dedusting; In streamer-discahrge plasma reactor 2; Constituted electric field space by negative electrode 201 and anode 202; The high voltage source of connecting 10-50kV is to applying voltage between the two poles of the earth; Air in the injecting reactor is carried out discharge generation plasma free radical, and will contain the gas injection flue of plasma free radical, the plasma free radical partly or entirely is oxidized to oxysulfide, nitrogen oxide the oxide (NO of the higher valence state that is easy to absorb
2, N
2O
3, N
2O
5, SO
3Deng).Flue gas through the effect of plasma free radical gets into desulfurizing tower 3, and flue gas is bottom-up in tower, with the NH that contains of spraying layer 5 ejections
3H
2The circulated sprinkling absorbent of O carries out counter current contacting, the NH in the oxysulfide in the flue gas, nitrogen oxide and the absorbent
3Comprise (NH in conjunction with generating
4)
2SO
3, NH
4HSO
3, (NH
4)
2SO
4, NH
4NO
2, NH
4NO
3Mixed solution, the ammonium salt mixed solution that obtains gets into reservoir 302, sends into spraying layer 5 through being located at desulfurizing tower 3 outside circulating pumps 4 again, continues spray, contact oxysulfide and NO in the absorption flue gas with flue gas
xWarp is circulated sprinkling repeatedly; When the total salt concentration of the solution in the reservoir 302 reached 30-42wt%, solution just can be discharged through outlet 301, and the solution of discharge then can carry out the outer forced oxidation of follow-up tower and handle (in solution, blast air or oxygen gets final product); Through crystallization thickening dried, obtain chemical fertilizer afterwards.
Flue gas is then through demister 6, removes droplet in the flue gas, salt, aerosol cloud particulate etc., and the demist purification is after chimney 7 dischargings reach the desulphurization denitration purpose.
Need to prove, before processing, can ammoniacal liquor 8 and water 9 be injected reservoir 302 respectively, as the initial source of circulated sprinkling liquid.
In the processing procedure,, can ammoniacal liquor 8 and water 9 directly be imported in the reservoir 302 if need continuous supplementation water and ammonia.
Embodiment 2:
As shown in Figure 1, a kind of corona plasma free radical injects the desulfurization denitration method of flue gas, comprises the steps: to pass through flue through the boiler smoke 1 of dedusting; In streamer-discahrge plasma reactor 2; Constituted electric field space by negative electrode 201 and anode 202; Connect the high voltage source of 50-100kV the oxygen in the injecting reactor is carried out discharge generation plasma free radical; And the gas that will contain the plasma free radical injects flue, and the plasma free radical partly or entirely is oxidized to oxysulfide, nitrogen oxide the oxide (NO of the higher valence state that is easy to absorb
2, N
2O
3, N
2O
5, SO
3Deng).Flue gas through the effect of plasma free radical gets into desulfurizing tower 3, and flue gas is bottom-up in tower, with the NH that contains of spraying layer 5 ejections
3H
2The circulated sprinkling absorbent of O carries out counter current contacting, the NH in the oxysulfide in the flue gas, nitrogen oxide and the absorbent
3Comprise (NH in conjunction with generating
4)
2SO
3, NH
4HSO
3, (NH
4)
2SO
4, NH
4NO
2, NH
4NO
3Mixed solution, the ammonium salt mixed solution that obtains gets into reservoir 302, sends into spraying layer 5 through being located at desulfurizing tower 3 outside circulating pumps 4 again; Continue spray, contact, absorb oxysulfide and nitrogen oxide in the flue gas with flue gas; Warp is circulated sprinkling repeatedly, and while forced oxidation (in solution, blasting air or oxygen) in tower is when the salinity of the solution in the reservoir 302 reaches 30-42wt%; Solution just can be discharged through outlet 301; The solution of discharging then can carry out follow-up tower external oxidation and handle (in solution, blasting air or oxygen gets final product), handles through dehydration crystallization concentrate drying afterwards, obtains chemical fertilizer.
Flue gas is then through demister 6, removes droplet in the flue gas, salt, aerosol cloud particulate etc., and the demist purification is after chimney 7 dischargings reach the desulphurization denitration purpose.
Need to prove, before processing, can ammoniacal liquor 8 and water 9 be injected reservoir 302 respectively, as the initial source of circulated sprinkling liquid.
In the processing procedure,, can ammoniacal liquor 8 and water 9 directly be imported in the reservoir 302 if need continuous supplementation water and ammonia.
Claims (5)
1. a corona plasma free radical injects the desulfurization denitration method of flue gas, it is characterized in that: may further comprise the steps:
1) utilize the streamer-discahrge plasma reactor that oxygen or air are carried out discharge generation plasma free radical;
The gas that 2) will contain the plasma free radical injects flue, mixes with the flue gas of sulfur-containing oxide, nitrogen oxide, and the plasma free radical makes the oxysulfide in the flue gas, the oxide that nitrogen oxide changes higher valence state into;
3) flue gas that will go up the step is sent into desulfurizing tower and is carried out circulated sprinkling and absorb, and makes oxysulfide, nitrogen oxide get into liquid phase;
4) the flue gas process demist of process circulated sprinkling absorption is after smoke stack emission.
2. a kind of corona plasma free radical according to claim 1 injects the desulfurization denitration method of flue gas, it is characterized in that: be provided with negative electrode and anode in the described streamer-discahrge plasma reactor.
3. a kind of corona plasma denitration method for flue gas according to claim 1 is characterized in that: the power supply that described streamer-discahrge plasma reactor adopts is the AC/DC power supply.
4. a kind of corona plasma free radical according to claim 1 injects the desulfurization denitration method of flue gas, it is characterized in that: it is alkaline absorbent that circulated sprinkling absorbs used absorbent.
5. a kind of corona plasma free radical according to claim 4 injects the desulfurization denitration method of flue gas, and it is characterized in that: described alkaline absorbent comprises ammoniacal liquor, NaOH, calcium hydroxide, calcium oxide.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103657358A (en) * | 2013-12-06 | 2014-03-26 | 上海凯展环保科技有限公司 | Multifunctional waste gas treatment system |
| CN104591355A (en) * | 2015-01-29 | 2015-05-06 | 广东佳德环保科技有限公司 | Method for disinfecting and sterilizing water by virtue of streamer discharge plasmas |
| CN106422722A (en) * | 2016-10-12 | 2017-02-22 | 广东佳德环保科技有限公司 | Sintering flue gas denitration method adopting oxidation method |
| CN106540529A (en) * | 2016-12-23 | 2017-03-29 | 大连海事大学 | A kind of gas pollutant integrated treatment unit |
| CN106669400A (en) * | 2015-11-11 | 2017-05-17 | 苏州超等环保科技有限公司 | Process for treating flue gas through advanced oxidation of plasmas |
| CN106989407A (en) * | 2016-01-20 | 2017-07-28 | 杭州中兵环保股份有限公司 | NOx cancellation elements and method in a kind of flue gas |
| CN107875817A (en) * | 2017-09-25 | 2018-04-06 | 杨家华 | A kind of plasma denitrification apparatus |
| CN110252102A (en) * | 2019-07-16 | 2019-09-20 | 上海迪夫格环境科技有限公司 | A kind of width load method of denitration and device |
| CN110975541A (en) * | 2019-12-20 | 2020-04-10 | 广东佳德环保科技有限公司 | Treatment device and method for VOCs-containing sintering flue gas |
| CN111330423A (en) * | 2020-03-06 | 2020-06-26 | 昆明理工大学 | Method for simultaneously removing nitrogen oxide and gaseous mercury |
| CN111495158A (en) * | 2020-05-29 | 2020-08-07 | 广东佳德环保科技有限公司 | System and method for desulfurization and denitrification by cooperation of electron beam and oxidant |
| CN112933898A (en) * | 2021-02-09 | 2021-06-11 | 江苏盐环实业有限公司 | Flue gas desulfurization and denitrification system |
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| CN101961596A (en) * | 2010-07-19 | 2011-02-02 | 大连海事大学 | Oxidation sweetening and denitration method for hydroxyl radical of oxygen active particles injected in flue duct |
| CN102274680A (en) * | 2011-07-22 | 2011-12-14 | 广东佳德环保科技有限公司 | Steamer discharge ammonia flue gas desulfurization, denitration and demisting integrated method |
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2012
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| CN1562445A (en) * | 2004-03-29 | 2005-01-12 | 广东杰特科技发展有限公司 | Method of synchronous cleansing air pollutant by smoke of plasma discharge caused by spreading light |
| CN101961596A (en) * | 2010-07-19 | 2011-02-02 | 大连海事大学 | Oxidation sweetening and denitration method for hydroxyl radical of oxygen active particles injected in flue duct |
| CN102274680A (en) * | 2011-07-22 | 2011-12-14 | 广东佳德环保科技有限公司 | Steamer discharge ammonia flue gas desulfurization, denitration and demisting integrated method |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103657358A (en) * | 2013-12-06 | 2014-03-26 | 上海凯展环保科技有限公司 | Multifunctional waste gas treatment system |
| CN104591355A (en) * | 2015-01-29 | 2015-05-06 | 广东佳德环保科技有限公司 | Method for disinfecting and sterilizing water by virtue of streamer discharge plasmas |
| CN106669400A (en) * | 2015-11-11 | 2017-05-17 | 苏州超等环保科技有限公司 | Process for treating flue gas through advanced oxidation of plasmas |
| CN106989407A (en) * | 2016-01-20 | 2017-07-28 | 杭州中兵环保股份有限公司 | NOx cancellation elements and method in a kind of flue gas |
| WO2018068548A1 (en) * | 2016-10-12 | 2018-04-19 | 广东佳德环保科技有限公司 | Oxidation method for sintering flue gas denitrification and system |
| CN106422722A (en) * | 2016-10-12 | 2017-02-22 | 广东佳德环保科技有限公司 | Sintering flue gas denitration method adopting oxidation method |
| CN106540529A (en) * | 2016-12-23 | 2017-03-29 | 大连海事大学 | A kind of gas pollutant integrated treatment unit |
| CN107875817A (en) * | 2017-09-25 | 2018-04-06 | 杨家华 | A kind of plasma denitrification apparatus |
| CN110252102A (en) * | 2019-07-16 | 2019-09-20 | 上海迪夫格环境科技有限公司 | A kind of width load method of denitration and device |
| CN110975541A (en) * | 2019-12-20 | 2020-04-10 | 广东佳德环保科技有限公司 | Treatment device and method for VOCs-containing sintering flue gas |
| CN111330423A (en) * | 2020-03-06 | 2020-06-26 | 昆明理工大学 | Method for simultaneously removing nitrogen oxide and gaseous mercury |
| CN111495158A (en) * | 2020-05-29 | 2020-08-07 | 广东佳德环保科技有限公司 | System and method for desulfurization and denitrification by cooperation of electron beam and oxidant |
| CN111495158B (en) * | 2020-05-29 | 2024-02-27 | 广东佳德环保科技有限公司 | System and method for desulfurizing and denitrating by electron beam cooperated with oxidant |
| CN112933898A (en) * | 2021-02-09 | 2021-06-11 | 江苏盐环实业有限公司 | Flue gas desulfurization and denitrification system |
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Application publication date: 20121107 |