CN103007752B - A kind of flue gas Wet-type reduction, denitration and method for innocent treatment - Google Patents
A kind of flue gas Wet-type reduction, denitration and method for innocent treatment Download PDFInfo
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- CN103007752B CN103007752B CN201210578309.XA CN201210578309A CN103007752B CN 103007752 B CN103007752 B CN 103007752B CN 201210578309 A CN201210578309 A CN 201210578309A CN 103007752 B CN103007752 B CN 103007752B
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- flue gas
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Abstract
The present invention relates to a kind of flue gas Wet-type reduction, denitration and method for innocent treatment, comprise containing NO
xflue gas pass in acid ferrous solution, under the temperature conditions of 0-100 DEG C, absorb NO
xgenerate the absorbing liquid of auburn nitroso-ferrous salt, nitric acid and nitrous acid, finally realize denitrating flue gas process.Absorbing liquid after denitration is added reducing agent and catalyst, makes absorbed nitroso change into nitrogen, thus realize harmless treatment.
Description
Technical field
The present invention relates to flue gases purification field, particularly a kind of flue gas Wet-type reduction, denitration and method for innocent treatment.
Background technology
Containing harmful components nitrogen oxide in the gas that fuel combustion generates, wherein mainly nitric oxide, nitrogen dioxide, the dinitrogen pentoxide of nitrogen trioxide and trace, NO made in brief note
x.Eliminate NO
x, the technical process that emission gases is purified is denitration.
At present, China is for the NO of burning generation
xcontrol and control three classes after burning in control before control method mainly contains burning, burning.Control before burning to refer to and select low nitrogen fuel, but cost is very high, engineer applied is less.Control in burning to refer to and improve combustion system and production technology, adopt low NOx combusting technology, reduce NO in stove
xgrowing amount, the method expense is lower, but due to the limitation of low-NO_x combustion technology in stove, makes NO
xcontrol effects can not be satisfactory.Control after burning to refer at flue afterbody De-NO_x, by the NO in flue gas
xchange harmless N into
2or useful fertilizer.Due to the NO of denitrating flue gas
xremoval efficiency is high, and run simple, therefore, seek technical advanced person, the gas denitrifying technology of reasonable in economy is China control NO
xthe emphasis of discharge work.
Gas denitrifying technology mainly contains selective catalytic reduction (SCR), non-selective catalytic reduction (NSCR), SNCR method (SNCR), ozone oxidation absorption process, activated carbon combined desulfurization, denitration method etc.Because SCR method denitration efficiency is up to more than 90%, reliable, be one of gas denitrifying technology that current domestic and international application is at most and the most ripe.But the inventor's patent right of SCR gas denitrifying technology belongs to the U.S., and have cost high, equipment investment is large, and operating cost is higher, and catalyst strength is the inferior position such as poisoning not and easily.
Therefore study a kind of operating efficiency high, operating cost is low, and resource consumption is few, configuration device and simple process, and the gas denitrifying technology with the autonomous property right of novelty is significant.
Summary of the invention
It is high that the object of the invention is to provide a kind of operating efficiency, and operating cost is low, and resource consumption is few, the flue gas Wet-type reduction, denitration of configuration device and simple process and method for innocent treatment.
In order to solve the problems of the technologies described above, the invention provides a kind of flue gas Wet-type reduction, denitration and method for innocent treatment, comprising: pending flue gas is passed in acid ferrous solution, under the temperature conditions of 0-100 DEG C, absorb NO
xgenerate the mixed liquor of auburn nitroso-ferrous salt, nitric acid and nitrous acid, above-mentioned mixed solution is carried out reduction treatment, pending flue gas is reached and cleans discharge.
Further, passed into by pending flue gas in acid ferrous solution, under the temperature conditions of an atmospheric pressure, 0-100 DEG C, the reaction time is 0-4h, absorbs NO
xgenerate the mixed liquor of auburn nitroso-ferrous salt, nitric acid and nitrous acid, above-mentioned mixed solution is carried out reduction treatment, pending flue gas is reached and cleans discharge.
Further, passed into by pending flue gas in acid ferrous solution, under the temperature conditions of 0-100 DEG C, the reaction time is 0-4h, absorbs NO
xgenerate the mixed liquor of auburn nitroso-ferrous salt, nitric acid and nitrous acid, above-mentioned mixed solution is carried out reduction treatment, pending flue gas is reached and cleans discharge.
Further, described flue gas comprises: what all high temp. combustion of fuels produced contains NO
xgas.
Further, described acid ferrous solution comprises: frerrous chloride and/or ferrous sulfate, and wherein in solution, the concentration of ferrous solution controls at 1-3mol/L.
Further, in described acid ferrous solution, initial hydrogen ion concentration is 0.6-1mol/L.
Further, in described acid ferrous solution, hydrogen ion concentration is 0.3-2mol/L.
Further, describedly above-mentioned mixed solution is carried out reduction treatment comprise: add reducing agent and catalyst by the mixed solution of above-mentioned nitroso-ferrous salt, nitric acid and nitrous acid, carry out reduction reaction, make nitroso change into nitrogen and release, thus realize cleaning discharge.
Further, the ferrous solution cyclic absorption that the ferrous solution that described reduction reaction generates can be used as smoke treatment utilizes.
Further, described reducing agent comprises iron powder or sodium sulfite.
Further, described catalyst is Cu-Mn(I) or active carbon.
Further, adopt iron powder to make reducing agent when carrying out absorbing liquid post processing, in absorbing liquid, hydrogen ion concentration is 0.6-1mol/L.
A kind of flue gas Wet-type reduction, denitration provided by the invention and method for innocent treatment, for the iron system absorbing liquid in denitrification process, can regenerate, can realize recycling, thus reduce the operating cost of system.Nitrogen oxide in flue gas finally as nitrogen resource reclaim, really realizes energy-saving and emission-reduction, and recycling economy turns waste into wealth, and potential economic benefit is huge.The method is in processing procedure and recycling process, and non-secondary pollution, realize the innoxious of flue gas and clean discharge, environmental benefit is obvious.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of a kind of flue gas Wet-type reduction, denitration of providing of the embodiment of the present invention and method for innocent treatment.
Detailed description of the invention
See Fig. 1, the present invention adopts ferrous iron acid solution to do containing NO
xthe absorbing liquid of flue gas, wherein two valency ferrous solutions comprise: frerrous chloride and/or ferrous sulfate etc.; The kind of the acid in acid medium comprises: hydrochloric acid and/or sulfuric acid.The concentration of ferrous solution controls at 1-3mol/L, and in its acid medium, hydrogen ion concentration is 0.6-1mol/L, under the temperature conditions of 0-100 DEG C, absorbs NO
x, generate auburn nitroso-ferrous salt, the mixed liquor of nitric acid and nitrous acid.This mixed liquor is by catalytic reduction method process, and make it reach clean innoxious object, namely get the mixed solution determining volume respectively, add the one of following reducing agent, reducing agent comprises: iron powder or sodium sulfite etc.; Add the one of following catalyst, catalyst comprises: Cu-Mn(II) or active carbon etc.Wherein make reducing agent according to iron powder, absorbing liquid must ensure that hydrogen ion concentration is 0.6-1mol/L.Absorbing liquid black takes off, and become emerald two valency ferrous solutions gradually, the gas nitrogenfree oxide of release detects, and is mainly nitrogen, directly can enter air.The green ferrous solution reusable edible that this reaction generates.
embodiment 1
Getting hydrogen ion concentration is 1mol/L, and ferrous iron concentration is the ferrous chloride solution 1L of 2.7mol/L, then in 30 DEG C, under an atmospheric pressure, pass into nitric oxide gas, intake is 1.7mol, reaction time is 0-4h, become dark brown to absorbing liquid to stop, after leaving standstill 1h, this absorbing liquid adds 214g sodium sulfite solid and 5g activated-carbon catalyst, abundant stirring, the gas of release detects through gas detecting instrument, and main component is nitrogen, and nitrogenfree oxide detects.
embodiment 2
Getting hydrogen ion concentration is 0.7mol/L, and ferrous iron concentration is the ferrous chloride solution 300ml of 1.3mol/L, then in 30 DEG C, under an atmospheric pressure, pass into nitric oxide gas, intake is 0.39mol, reaction time is 0-3h, become dark brown to absorbing liquid to stop, after leaving standstill 1h, this absorbing liquid adds the sodium sulfite solid of 49g and the Cu-Mn(II of 5g) catalyst, abundant stirring, the gas of release detects through gas detecting instrument, and main component is nitrogen, and nitrogenfree oxide detects.
The present invention has following beneficial aspects:
1, change existing treatment process, while realizing denitration, decrease cost of investment and unit scale, reduce operating cost, be an important breakthrough to gas denitrifying technology, really achieve social benefit, the organic unity of economic benefit and environmental benefit.
2, this technique opens the once technical revolution of denitration industry, has good future in engineering applications.Technological precedence, belongs to domestic initiation, and will fill up international blank.Its Transformation Application will have far-reaching social value.
3, this technology is used for the iron system absorbing liquid in denitrification process, can regenerate, can realize recycling, thus reduces the operating cost of system.Nitrogen oxide in flue gas finally as nitrogen resource reclaim, really realizes energy-saving and emission-reduction, and recycling economy turns waste into wealth, and potential economic benefit is huge.
4, in the processing procedure run of this technology and recycling process, non-secondary pollution, realize the innoxious of flue gas and clean discharge, environmental benefit is obvious.
5, compared with existing denitration technology, have equipment and simplify, take up an area few, reduced investment, operating cost is low, and denitration efficiency is stablized, and operation is simple and reliable, the feature of convenient management.
Claims (2)
1. flue gas Wet-type reduction, denitration and a method for innocent treatment, is characterized in that, comprising:
What produced by high temp. combustion of fuel contains NO
xgas passes in acid ferrous solution, and under the temperature conditions of an atmospheric pressure, 30-100 DEG C, the reaction time, for being less than 4h, absorbs NO
xgenerate the mixed liquor of auburn nitroso-ferrous salt, nitric acid and nitrous acid, above-mentioned mixed solution is carried out reduction treatment, pending flue gas is reached and cleans discharge.
Described acid ferrous solution comprises: frerrous chloride and/or ferrous sulfate, and wherein in solution, the concentration of ferrous solution controls at 1-3mol/L; In described acid ferrous solution, initial hydrogen ion concentration is 0.6-1mol/L;
Describedly above-mentioned mixed solution carried out reduction treatment comprise:
Add reducing agent and catalyst by the mixed solution of above-mentioned nitroso-ferrous salt, nitric acid and nitrous acid, carry out reduction reaction, make nitroso change into nitrogen and release, thus realize cleaning discharge;
The ferrous solution cyclic absorption that the ferrous solution that described reduction reaction generates can be used as smoke treatment utilizes; Described reducing agent comprises iron powder or sodium sulfite;
Described catalyst is Cu-Mn (II) or active carbon.
2. flue gas Wet-type reduction, denitration according to claim 1 and method for innocent treatment, is characterized in that:
Adopt iron powder to make reducing agent when carrying out absorbing liquid post processing, in absorbing liquid, hydrogen ion concentration is 0.6-1mol/L.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210578309.XA CN103007752B (en) | 2012-09-12 | 2012-12-27 | A kind of flue gas Wet-type reduction, denitration and method for innocent treatment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103377373A CN102794099A (en) | 2012-09-12 | 2012-09-12 | Flue gas wet-type reduction denitration and harmless processing method |
| CN201210337737.3 | 2012-09-12 | ||
| CN201210578309.XA CN103007752B (en) | 2012-09-12 | 2012-12-27 | A kind of flue gas Wet-type reduction, denitration and method for innocent treatment |
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| CN103007752A CN103007752A (en) | 2013-04-03 |
| CN103007752B true CN103007752B (en) | 2016-01-06 |
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| CN112393246A (en) * | 2020-11-02 | 2021-02-23 | 东营华新环保技术有限公司 | Harmless treatment method for hazardous waste |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1990089A (en) * | 2005-12-28 | 2007-07-04 | 浙江大学 | Wet process complex denitration technique enhancing Fe*EDTA by using sulfite reducing agent |
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| CN101637688B (en) * | 2009-08-14 | 2013-06-12 | 暨南大学 | Treatment method and device for waste gas containing nitrogen oxides |
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- 2012-09-12 CN CN2012103377373A patent/CN102794099A/en not_active Withdrawn
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1990089A (en) * | 2005-12-28 | 2007-07-04 | 浙江大学 | Wet process complex denitration technique enhancing Fe*EDTA by using sulfite reducing agent |
Non-Patent Citations (1)
| Title |
|---|
| 湿法脱硝技术在燃煤烟气净化中的应用及研究进展;王莉;<<安全与环境学报>>;20100630;第10卷(第3期);第74页 * |
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|---|---|
| CN103007752A (en) | 2013-04-03 |
| CN102794099A (en) | 2012-11-28 |
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