CN102500226A - Dry smoke desulfurization, denitration and mercury removal integration device and method thereof - Google Patents
Dry smoke desulfurization, denitration and mercury removal integration device and method thereof Download PDFInfo
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- CN102500226A CN102500226A CN2011103575488A CN201110357548A CN102500226A CN 102500226 A CN102500226 A CN 102500226A CN 2011103575488 A CN2011103575488 A CN 2011103575488A CN 201110357548 A CN201110357548 A CN 201110357548A CN 102500226 A CN102500226 A CN 102500226A
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- flue gas
- humidifier
- digestion
- deduster
- ash
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Abstract
The invention discloses a dry smoke desulfurization, denitration and mercury removal integration device. The device comprises, sequentially connected, a reaction tower, a deduster, a draught fan and a chimney, and also comprises a digestion humidifier and a solution tank, the output end of the solution tank is connected with the input end of the digestion humidifier, the cycle ash output end of the deduster is connected with the input end of the digestion humidifier, and the output end of the digestion humidifier is connected with the lower part of the reaction tower. The invention also discloses a dry smoke desulfurization, denitration and mercury removal integration method. The method comprises the following steps: adding an absorbent, an oxidation additive and cycle ash to the humidifier to form humid mixed ash, accessing the smoke to the reaction tower, and spraying the cycle ash to the reaction tower. According to the invention, no extra cycle ash is needed, the device integrates the desulfurization, the denitration and the mercury removal, and element mercury (Hg<0>) is oxidized into stable oxidation state mercury (Hg<2+>) by the device.
Description
Technical field
The present invention relates to a kind of dry type flue gas desulfurizing denitration demercuration integrated apparatus and method.
Background technology
The contained SO of coal-fired flue-gas
2And NO
XDischarging be the main cause that forms acid rain, existent environment of people and health are caused great harm.China is to the SO in the flue gas at present
2And NO
XRemove and all carry out separately usually, adopt flue gas desulfurization (FGD), denitrating flue gas (SCR/SNCR) and demercuration respectively, separately from needing a cover system or technological process to handle.Not only technological process is complicated, and equipment is many, and floor space is big, and operating cost is high.
Dry type flue gas desulfurizing denitrification integral method mainly contains high energy electron oxidizing process (comprising electronic beam method, impulse electric corona plasma technology, streamer-discahrge plasma technology, catalytic oxidation method etc.) at present, solid phase adsorption/method of reproduction (comprises activated coke absorption method, NO
XSO method, NH
3/ V
2O
X-TiO
2Method, CuO absorption method, Pahlman flue gas desulfurization and denitration technique etc.), liquid-film method etc.Shortcomings such as high energy electron oxidizing process ubiquity energy consumption height, solid phase adsorption/method of reproduction reaction temperature is high, and the adsorbent production cost is expensive; There are problems such as service life is long in liquid-film method.
A kind of flue gas desulfuration and denitrification purification method and device are disclosed in the patent No. is the patent of invention of ZL200310103954.7.It is in circulating fluid bed reactor, to spray into a kind of highly active absorbent, absorbs sulfur dioxide in flue gas SO
2With nitrogen oxide NO
XUtilize feed back on the dust arrester will be not the highly active absorbent of complete reaction send back in the charge pipe and recycle.This highly active absorbent is flyash, calcium hydroxide and the additive of certain proportioning, and middle additive is potassium permanganate KMnO
4, calcium hypochlorite Ca (ClO)
2, ammonium persulfate (NH
4)
2S
2O
8With Peracetic acid CH
3Among the COOOH one or more, and this highly active absorbent forms through special processing and fabricating.
Desulfurization, denitration have the technology of a cover system separately of one's own, though can reach effective removal to pollutant, because of system independent separately; The huge area occupied of desulphurization denitration equipment volume is big, and the technological process of system is complicated, and the control of whole system is required than higher; Two covering device separate configurations increase investment, increase SR; Increase power consumption, increase operating cost.
A kind of flue gas desulfuration and denitrification purification method prepares the back with absorbent and adds desulphurization denitration equipment owing to will in absorbent, add a large amount of flyash in the workshop, have following problem:
(1) in the absorbent because the flyash amount is bigger, account for 30%-60%, cause the absorbent use amount bigger, and absorbent needs the complicated preparation facilities of a cover, in industrial applications, need to solve preparation, storage, the transportation of absorbent.
(2) added a large amount of flyash in the absorbent, the grey conveying capacity that causes dedusting in the desulphurization denitration equipment to increase added burden, grey induction system increases.
(3) absorbent is not instant system, and additive is unstable material in the absorbent, under higher temperature and long period storage condition, is prone to lose efficacy, and has potential safety hazard.
(4) original semidry process desulfurizer being increased the denitration function need transform former lime storage, conveying, metering device.
Summary of the invention
The object of the present invention is to provide a kind of dry type flue gas desulfurizing denitration demercuration integrated apparatus and method, can effectively solve prior art, need to add a large amount of flyash, increase the problem of added burden can not effectively removing the mercury in the gas.
In order to solve the problems of the technologies described above; The present invention realizes through following technical scheme: a kind of dry type flue gas desulfurizing denitration demercuration integrated apparatus; Comprise the reaction tower, deduster, air-introduced machine, the chimney that connect successively, also comprise digestion humidifier, liquor box, the output of said liquor box links to each other with the input of digestion humidifier; The circulating ash output also links to each other with the input of digestion humidifier in the said deduster, and the output of said digestion humidifier links to each other with the bottom of reaction tower.
Preferably, also be provided with pump between said liquor box and the digestion humidifier.
A kind of dry type flue gas desulfurizing denitration demercuration method; In the digestion humidifier, add absorbent, the oxidisability additive solution in the liquor box is added the digestion humidifier, the circulating ash in the deduster is also joined in the digestion humidifier through pump; Formation contains wet combination ash, from the SO that contains of major project discharge
X, NO
XAnd the flue gas that mercury is gets into reaction tower, and circulating ash is sprayed in the reaction tower, and the temperature of flue gas is reduced to 70 ℃～120 ℃, and the humidity of flue gas reaches 8%～15%, makes SO
X, NO
XWith the substance reaction in the combination ash; Most of particle mercury and mercury oxide are recycled ash absorption simultaneously; Flue gas through desulfurization denitration demercuration gets into deduster, and the flue gas in the deduster is sent into chimney by air-introduced machine, and the collected circulating ash of deduster gets in the digestion humidifier again.
Preferably, said absorbent is CaO or Ca (OH)
2Powder.
Preferably, said oxidation additive be potassium permanganate or potassium permanganate with calcium hypochlorite, potassium bichromate, clorox, sodium chlorite in one or more mix.
Preferably, the addition of said oxidation additive is 0.8%～4% of an absorbent quality.
Preferably, said oxidation additive joins in the liquor box.
Preferably, the water capacity that contains wet combination ash is 3%～5%.
Compared with prior art, advantage of the present invention is: do not need extra interpolation circulating ash, desulfurization, denitration, demercuration equipment are integrated again; Technology controlling and process is simple, and floor space is little, and one-time investment is little; Reduce the running resistance of system; Reduce operating energy consumption, practice thrift operating cost, device is to element state mercury (Hg
0) done oxidation and formed comparatively stable oxidation state mercury (Hg
2+), and common desulfation dust-extraction device only makes element state mercury (Hg
0) absorption, unstable in atmospheric environment.
Description of drawings
Fig. 1 is the structural representation of a kind of dry type flue gas desulfurizing denitration demercuration of the present invention integrated apparatus.
The specific embodiment
Consult a kind of dry type flue gas desulfurizing denitration demercuration of Fig. 1 integrated apparatus; Comprise the reaction tower 1, deduster 2, air-introduced machine 3, the chimney 4 that connect successively; Also comprise digestion humidifier 5, liquor box 6, the output of said liquor box 6 links to each other with the input of digestion humidifier 5, and the circulating ash output also links to each other with the input of digestion humidifier 5 in the said deduster 2; The output of said digestion humidifier 5 links to each other with the bottom of reaction tower 1, also is provided with pump 7 between said liquor box 6 and the digestion humidifier 5.
A kind of dry type flue gas desulfurizing denitration demercuration method; In digestion humidifier 5, add absorbent; Through pump 7 the oxidisability additive solution in the liquor box 6 is added digestion humidifier 5; Circulating ash in the deduster 2 is also joined in the digestion humidifier 5, and formation contains wet combination ash, and said absorbent is CaO or Ca (OH)
2Powder; Said oxidation additive be potassium permanganate or potassium permanganate with calcium hypochlorite, potassium bichromate, clorox, sodium chlorite in one or more mix; Said oxidation additive joins in the liquor box 6; The addition of said oxidation additive is 0.8%～4% of an absorbent quality, and the water capacity that contains wet combination ash is 3%～5%, from the SO that contains of major project discharge
X, NO
XAnd the flue gas that mercury is gets into reaction tower 1, and circulating ash is sprayed in the reaction tower 1, and the temperature of flue gas is reduced to 70 ℃～120 ℃, and the humidity of flue gas reaches 8%～15%, makes SO
X, NO
XWith the substance reaction in the combination ash; Most of particle mercury and mercury oxide are recycled ash absorption simultaneously; Flue gas through desulfurization denitration demercuration gets into deduster 2, and the flue gas in the deduster 2 is sent into chimney 4 by air-introduced machine 3, and deduster 2 collected circulating ash get in the digestion humidifier 5 again.
Flue gas gets into reaction tower 1, in reaction tower 1, carries out desulfurization, denitration, demercuration reaction, and it is following to react main equation:
Ca(OH)
2+SO
2→CaSO
3.1/2H
2O+1/2H
2O
CaSO
3.1/2H
2O+1/2O
2→CaSO
4.1/2H
2O
3NO
2+H
2O→2HNO
3+NO
NO
2+NO+H
2O→2HNO
2
Ca(OH)
2+2HNO
2→Ca(NO
2)
2+2H
2O
Ca(OH)
2+2HNO
3→Ca(NO
3)
2+2H
2O
The above is merely specific embodiment of the present invention, but technical characterictic of the present invention is not limited thereto, and any those skilled in the art is in the field of the invention, and the variation of being done or modify all is encompassed among the claim of the present invention.
Claims (8)
1. dry type flue gas desulfurizing denitration demercuration integrated apparatus; Comprise the reaction tower (1), deduster (2), air-introduced machine (3), the chimney (4) that connect successively; It is characterized in that: also comprise digestion humidifier (5), liquor box (6); The output of said liquor box (6) links to each other with the input of digestion humidifier (5), and the circulating ash output also links to each other with the input of digestion humidifier (5) in the said deduster (2), and the output of said digestion humidifier (5) links to each other with the bottom of reaction tower (1).
2. a kind of dry type flue gas desulfurizing denitration demercuration integrated apparatus as claimed in claim 1 is characterized in that: also be provided with pump (7) between said liquor box (6) and the digestion humidifier (5).
3. dry type flue gas desulfurizing denitration demercuration method; It is characterized in that: in digestion humidifier (5), add absorbent; Through pump (7) the oxidisability additive solution in the liquor box (6) is added digestion humidifier (5); Circulating ash in the deduster (2) is also joined in the digestion humidifier (5), and formation contains wet combination ash, from the SO that contains of major project discharge
X, NO
XAnd the flue gas that mercury is gets into reaction tower (1), and circulating ash is sprayed in the reaction tower (1), and the temperature of flue gas is reduced to 70 ℃～120 ℃, and the humidity of flue gas reaches 8%～15%, makes SO
X, NO
XWith the substance reaction in the combination ash; Most of particle mercury and mercury oxide are recycled ash absorption simultaneously; Flue gas through desulfurization denitration demercuration gets into deduster (2); Flue gas in the deduster (2) is sent into chimney (4) by air-introduced machine (3), and the collected circulating ash of deduster (2) gets in the digestion humidifier (5) again.
4. a kind of dry type flue gas desulfurizing denitration demercuration method as claimed in claim 3 is characterized in that: said absorbent is CaO or Ca (OH)
2Powder.
5. a kind of dry type flue gas desulfurizing denitration demercuration method as claimed in claim 4 is characterized in that: said oxidation additive be potassium permanganate or potassium permanganate with calcium hypochlorite, potassium bichromate, clorox, sodium chlorite in one or more mix.
6. a kind of dry type flue gas desulfurizing denitration demercuration method as claimed in claim 5 is characterized in that: the addition of said oxidation additive is 0.8%～4% of an absorbent quality.
7. a kind of dry type flue gas desulfurizing denitration demercuration method as claimed in claim 5 is characterized in that: said oxidation additive joins in the liquor box (6).
8. a kind of dry type flue gas desulfurizing denitration demercuration method as claimed in claim 3 is characterized in that: the water capacity that contains wet combination ash is 3%～5%.
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|---|---|---|---|
| CN2011103575488A CN102500226A (en) | 2011-11-11 | 2011-11-11 | Dry smoke desulfurization, denitration and mercury removal integration device and method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103691302A (en) * | 2013-12-31 | 2014-04-02 | 吕宜德 | Dry desulfurization device and desulfurization method |
| CN105080307A (en) * | 2014-05-12 | 2015-11-25 | 陈汇宏 | Desulfurization and denitrification method for tail gas, used equipment and product application thereof |
| CN113325133A (en) * | 2021-05-19 | 2021-08-31 | 福建省锅炉压力容器检验研究院 | Method and device for detecting mercury in waste incineration flue gas |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101983755A (en) * | 2010-11-05 | 2011-03-09 | 浙江菲达脱硫工程有限公司 | Dry-type flue gas desulphurization, denitration and dedusting integrated device and method |
| CN202356019U (en) * | 2011-11-11 | 2012-08-01 | 浙江菲达脱硫工程有限公司 | Dry-type flue gas desulfurization, denitration and demercuration integrated device |
-
2011
- 2011-11-11 CN CN2011103575488A patent/CN102500226A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101983755A (en) * | 2010-11-05 | 2011-03-09 | 浙江菲达脱硫工程有限公司 | Dry-type flue gas desulphurization, denitration and dedusting integrated device and method |
| CN202356019U (en) * | 2011-11-11 | 2012-08-01 | 浙江菲达脱硫工程有限公司 | Dry-type flue gas desulfurization, denitration and demercuration integrated device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103691302A (en) * | 2013-12-31 | 2014-04-02 | 吕宜德 | Dry desulfurization device and desulfurization method |
| CN105080307A (en) * | 2014-05-12 | 2015-11-25 | 陈汇宏 | Desulfurization and denitrification method for tail gas, used equipment and product application thereof |
| CN113325133A (en) * | 2021-05-19 | 2021-08-31 | 福建省锅炉压力容器检验研究院 | Method and device for detecting mercury in waste incineration flue gas |
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Application publication date: 20120620 |