CN105289228A - Synergistic desulfurization and denitrification method of industrial flue gas - Google Patents
Synergistic desulfurization and denitrification method of industrial flue gas Download PDFInfo
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- CN105289228A CN105289228A CN201510833875.4A CN201510833875A CN105289228A CN 105289228 A CN105289228 A CN 105289228A CN 201510833875 A CN201510833875 A CN 201510833875A CN 105289228 A CN105289228 A CN 105289228A
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Abstract
The invention provides a synergistic desulfurization and denitrification method of industrial flue gas. The method comprises: leading the flue gas to pass through three desulfurization and denitrification units for purification treatment, and discharging the obtained product to the atmosphere. The desulfurization and denitrification method specifically comprises three steps of an organic amine fusion oxidation method, a catalytic reduction method, and a reaction absorption method, so that desulfurization and denitrification through multi-unit combination is realized. The synergistic desulfurization and denitrification method of industrial flue gas is performed in one device, and integrated desulfurization and denitrification is realized through a synergistic effect of the desulfurization and denitrification method. The desulphurization efficiency can reach 95%, and the denitrification efficiency can reach 90%.
Description
Technical field
The invention belongs to field of Environment Protection, particularly, relate to a kind of industrial smoke coordinated desulfurization method of denitration, the simultaneous removing of SO2, NOx in industrial smoke discharge can be realized.
Background technology
At present, the health of environmental pollution and using energy source problem the serious threat mankind environment of depending on for existence and mankind itself.The enterprises such as current most thermal power plant, cement, chemical industry, weaving are in the world all using thermal coal as fuel, and the pollution 90% of SO2 and NOx is from burning of coal.In combustion product, pollutant is subject to the close attention of people day by day to the pollution of ecological environment.
At present, Application comparison widely simultaneous SO_2 and NO removal technology be utilize the combination of traditional desulfur technology (FGD) and SCR technology (SCR) to realize.But be used alone desulphurization and denitration technology, equipment is complicated, run and investment cost is higher, easily cause secondary pollution.Use desulfurization and denitrification integral process then compact conformation, operation and investment cost decrease, and efficiency also can improve, and these factors also just decide flue gas synchronized desulfuring and denitrifying will become following a kind of development trend.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of industrial smoke coordinated desulfurization method of denitration, by the multiunit combination of desulphurization and denitration, desulphurization denitration can be concentrated on a set of equipment and carry out, realize integrated desulfurization out of stock, make desulphurization denitration device structure simple, reduce investment and operating cost, minimizing secondary pollution.
The object of the invention is to be achieved through the following technical solutions:
The invention provides a kind of industrial smoke coordinated desulfurization method of denitration, flue gas is disposed in air after carrying out purified treatment by three desulphurization denitration unit successively.
Preferably, described flue gas carries out purified treatment by three desulphurization denitration unit successively and comprises the following steps:
A1, flue gas enter the first desulphurization denitration unit, in the first desulphurization denitration unit, adopt organic amine to merge oxidizing process, organic amine and the SO merged in oxidant and flue gas
2, NO, NO
2abundant hybrid reaction, realizes first step desulphurization denitration; The method is wet desulphurization, and desulfuration efficiency can reach more than 80%, and denitration efficiency can reach more than 70%.The ammonia that after reaction, residue flue gas and organic amine decomposition produce together flows to the second desulphurization denitration unit;
A2, in the second desulphurization denitration unit, adopt catalytic reduction method, using the ammonia described in steps A 1 as reducing agent, with the SO in flue gas
2, NO, NO
2there is catalytic reduction reaction on the surface of solid catalyst, generate S, N
2deng material, realize second step desulphurization denitration; This method is dry desulfurization denitration, and desulfuration efficiency is 10 ~ 12%, and denitration efficiency is 15 ~ 17%; This method takes full advantage of the ammonia that first step desulphurization denitration produces, and has both improved the utilization ratio of desulfurization denitrification agent, and has prevented again the secondary pollution that the escaping of ammonia brings.
A3, through steps A 2 react after remaining flue gas enter the 3rd desulphurization denitration unit, in the 3rd desulphurization denitration unit, adopt reactive absorption method, alkaline absorbent fully mixed with flue gas, by absorption reaction, realize the 3rd step desulphurization denitration.The desulfuration efficiency of this method 3 ~ 7%, denitration efficiency is 3 ~ 7%.
Preferably, in described steps A 1, described organic amine is specially with fusion oxidant and the abundant hybrid reaction of flue gas: by merging oxidant to the SO in flue gas
2, NO carry out oxidation reaction generate SO
3, NO
2, then by organic amine and SO
3ammonium sulfate is produced in reaction; Reduce and NO, NO with by organic amine
2the N that can directly discharge is produced in reaction
2, CO
2.
Preferably, described organic amine percentage by weight in aqueous, 1% ~ 19%, merges oxidant percentage by weight in aqueous 0.1% ~ 1%; Described fusion oxidant is the highly reactive form of oxygen agent developed voluntarily, is the confection comprising chlorite, hypochlorite, perofskite type oxide, is made up of: oxygen, sodium, calcium, chlorine following element, manganese and magnesium.The percentage by weight of described organic amine is 1% ~ 19%, and when the percentage by weight of fusion oxidant is 0.1% ~ 1%, efficiency is best.
The present invention adopts the highly reactive form of oxygen agent developed voluntarily, has better oxidation effectiveness, improve the efficiency of desulphurization denitration than common active oxidizer.
Preferably, in described steps A 1, organic amine and fusion oxidant are mixed with flue gas by spray mode.
Preferably, in steps A 2, described solid catalyst is alkali metal oxide catalyst.
Preferably, in steps A 3, described absorption reaction is specially the SO in first flue gas
2, NO
2water-soluble generation sulfurous nitric acid HSO
3, nitric acid HNO
3, nitrous acid HNO
2, and NO and NO in gas phase
2the N that reaction generates
2o
3water-soluble rear generation HNO
2; Then the HSO generated
3, HNO
3and HNO
2sulphite, NO3-N and NO2-N is finally generated with alkaline adsorbent generation neutralization reaction.
Preferably, described alkaline adsorbent is the alkaline mixed solution of NaOH, calcium hydroxide, and the pH value of alkaline adsorbent is 10 ~ 14.
Preferably, described alkaline adsorbent is mixed with flue gas by spray mode.
The present invention adopts three step desulfurization denitration methods, comprises organic amine and merges oxidizing process, catalytic reduction method, reactive absorption method three step.It is the oxidation sweetening method of denitration adopting organic amine and merge oxidant that described organic amine merges oxidizing process; Described catalytic reduction method adopts organic amine to decompose the Ammonia reducing agent of generation and the method for catalyst synergy desulphurization denitration; Described reactive absorption method is the method adopting alkaline absorbent to absorb SO2, NOx, react, and realizes the desulphurization denitration to flue gas.Inventive desulfurization efficiency can reach 93 ~ 95%, and denitration efficiency reaches 87 ~ 90%.
Compared with prior art, the present invention has following beneficial effect:
1, the coordinated desulfurization method of denitration of the present invention's employing, can be integrated in a set of equipment by each for desulfurization denitration method unit, realize the simultaneous removing of SO2, nitrogen oxide NOx.
2, the present invention is by three step desulfurization denitration methods, realizes integration desulfurization denitration, can reach desulfuration efficiency 93 ~ 95%, denitration efficiency 87 ~ 90%.
3, desulphurization denitration device structure required for the present invention is simple, greatly can reduce investment and operating cost.
In the second step desulphurization denitration of 4, the inventive method, take full advantage of the ammonia that first step desulphurization denitration produces, both improve the utilization ratio of desulfurization denitrification agent, and prevented again the secondary pollution that the escaping of ammonia brings, be beneficial to environmental protection.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is industrial smoke coordinated desulfurization method of denitration flow chart.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
embodiment 1
As shown in Figure 1, after flue gas enters coordinated desulfurization denitration cleaning equipment, successively by three desulphurization denitration unit, after purified treatment, be disposed in air.
Concrete implementation step is as follows:
1, first flue gas enters the first desulphurization denitration unit, and in the first desulphurization denitration unit, organic amine and fusion oxidant pass through spray mode and the abundant hybrid reaction of flue gas, SO
2remove more than 80%, nitrogen oxide NOx (is NO and NO
2) remove after more than 70%, residue flue gas and organic amine decompose the ammonia produced and together flow to the second desulphurization denitration unit;
2, in the second desulphurization denitration unit, SO2, NOx in flue gas (are NO and NO
2) in the surface and first module of fixed catalyst, organic amine decomposes the ammonia generation catalytic reduction reaction produced, desulfuration efficiency is better than 10%, and denitration efficiency is better than 15%;
3, last, flue gas enters the 3rd desulphurization denitration unit, at the 3rd unit neutral and alkali absorbent by spray mode, fully mixes, by absorption reaction, can remove SO with flue gas
2about 5%, NO_x removal about 5%;
4, finally through the flue gas of three step purified treatment by smoke stack emission in air.
Described organic amine percentage by weight in aqueous, 1% ~ 19%, merges oxidant percentage by weight in aqueous 0.1% ~ 1%; Described fusion oxidant is the highly reactive form of oxygen agent developed voluntarily.
Described solid catalyst is alkali metal oxide catalyst.
Described alkaline adsorbent is the alkaline mixed solution of NaOH, calcium hydroxide, and described alkaline adsorbent pH value is 10 ~ 14.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (9)
1. an industrial smoke coordinated desulfurization method of denitration, is characterized in that, described method comprises after flue gas carries out purified treatment by three desulphurization denitration unit successively by flue gas, is disposed in air.
2. industrial smoke coordinated desulfurization method of denitration according to claim 1, is characterized in that, described flue gas carries out purified treatment by three desulphurization denitration unit successively and specifically comprises the following steps:
A1, flue gas enter the first desulphurization denitration unit, in the first desulphurization denitration unit, adopt organic amine to merge oxidizing process, organic amine and the SO merged in oxidant and flue gas
2, NO, NO
2abundant hybrid reaction, realizes first step desulphurization denitration; The ammonia that after reaction, residue flue gas and organic amine decomposition produce together flows to the second desulphurization denitration unit;
A2, in the second desulphurization denitration unit, adopt catalytic reduction method, using the ammonia described in steps A 1 as reducing agent, with the SO in flue gas
2, NO, NO
2there is catalytic reduction reaction on the surface of solid catalyst, realize second step desulphurization denitration;
A3, through steps A 2 react after remaining flue gas enter the 3rd desulphurization denitration unit, in the 3rd desulphurization denitration unit, adopt reactive absorption method, alkaline absorbent fully mixed with flue gas, by absorption reaction, realize the 3rd step desulphurization denitration.
3. industrial smoke coordinated desulfurization method of denitration according to claim 2, is characterized in that, in described steps A 1, described organic amine is specially with fusion oxidant and the abundant hybrid reaction of flue gas: by merging oxidant to the SO in flue gas
2, NO carries out oxidation reaction and generates SO respectively
3, NO
2, then by organic amine and SO
3ammonium sulfate is produced in reaction, and by organic amine reduction and NO, NO
2reaction produces N respectively
2, CO
2.
4. industrial smoke coordinated desulfurization method of denitration according to claim 2, is characterized in that, in described steps A 1, described organic amine and fusion oxidant are mixed with flue gas by spray mode.
5. the industrial smoke coordinated desulfurization method of denitration according to Claims 2 or 3 or 4, is characterized in that, described organic amine percentage by weight is in aqueous 1% ~ 19%, and merging oxidant percentage by weight is in aqueous 0.1% ~ 1%; Described fusion oxidant is the highly reactive form of oxygen agent developed voluntarily, is the confection comprising chlorite, hypochlorite, perofskite type oxide.
6. industrial smoke coordinated desulfurization method of denitration according to claim 2, is characterized in that, in steps A 2, described solid catalyst is alkali metal oxide catalyst.
7. industrial smoke coordinated desulfurization method of denitration according to claim 2, is characterized in that, in steps A 3, described absorption reaction is specially the SO in first flue gas
2, NO
2water-soluble generation sulfurous acid HSO
3, nitric acid HNO
3, nitrous acid HNO
2, and NO and NO
2the N that reaction generates
2o
3water-soluble rear generation HNO
2; Then the HSO generated
3, HNO
3and HNO
2sulphite, NO3-N and NO2-N is finally generated with alkaline adsorbent generation neutralization reaction.
8. the industrial smoke coordinated desulfurization method of denitration according to claim 2 or 7, it is characterized in that, described alkaline adsorbent is the alkaline mixed solution of NaOH, calcium hydroxide, described alkaline adsorbent pH value is 10 ~ 14.
9. industrial smoke coordinated desulfurization method of denitration according to claim 2, is characterized in that, described alkaline adsorbent is mixed with flue gas by spray mode.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106215616A (en) * | 2016-08-29 | 2016-12-14 | 合肥合意环保科技工程有限公司 | A kind of administering method of gaseous contaminant |
| CN106268173A (en) * | 2016-08-29 | 2017-01-04 | 合肥合意环保科技工程有限公司 | A kind of method of flue gas desulfurization |
| CN107261805A (en) * | 2017-08-22 | 2017-10-20 | 周凯 | A kind of special hydrazine solution of chimney smoke desulphurization denitration and preparation method thereof |
| CN110127641A (en) * | 2018-02-02 | 2019-08-16 | 中国科学院过程工程研究所 | A method of recycling nitrite from desulphurization denitration waste liquid |
| CN112337294A (en) * | 2019-08-07 | 2021-02-09 | 江苏赛隆节能技术工程股份有限公司 | SCR reaction system and method |
| CN113856445A (en) * | 2021-11-23 | 2021-12-31 | 山东船舶技术研究院 | Flue gas desulfurization and denitrification two-phase continuous absorption system and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106215616A (en) * | 2016-08-29 | 2016-12-14 | 合肥合意环保科技工程有限公司 | A kind of administering method of gaseous contaminant |
| CN106268173A (en) * | 2016-08-29 | 2017-01-04 | 合肥合意环保科技工程有限公司 | A kind of method of flue gas desulfurization |
| CN107261805A (en) * | 2017-08-22 | 2017-10-20 | 周凯 | A kind of special hydrazine solution of chimney smoke desulphurization denitration and preparation method thereof |
| CN107261805B (en) * | 2017-08-22 | 2020-10-02 | 周凯 | Hydrazine solution special for chimney flue gas desulfurization and denitrification and preparation method thereof |
| CN110127641A (en) * | 2018-02-02 | 2019-08-16 | 中国科学院过程工程研究所 | A method of recycling nitrite from desulphurization denitration waste liquid |
| CN112337294A (en) * | 2019-08-07 | 2021-02-09 | 江苏赛隆节能技术工程股份有限公司 | SCR reaction system and method |
| CN113856445A (en) * | 2021-11-23 | 2021-12-31 | 山东船舶技术研究院 | Flue gas desulfurization and denitrification two-phase continuous absorption system and method |
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