CN105289228B - A kind of industrial smoke coordinated desulfurization method of denitration - Google Patents
A kind of industrial smoke coordinated desulfurization method of denitration Download PDFInfo
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- CN105289228B CN105289228B CN201510833875.4A CN201510833875A CN105289228B CN 105289228 B CN105289228 B CN 105289228B CN 201510833875 A CN201510833875 A CN 201510833875A CN 105289228 B CN105289228 B CN 105289228B
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Abstract
The invention provides a kind of industrial smoke coordinated desulfurization method of denitration, methods described includes flue gas and passed sequentially through by flue gas after three desulphurization denitration units progress purified treatments, is emitted into air.Specifically by three step desulfurization denitration methods, including organic amine fusion oxidizing process, catalytic reduction method and reactive absorption method, realize that multiple-unit combines desulphurization denitration.The industrial smoke coordinated desulfurization method of denitration of the present invention is carried out in an equipment, by the synergy of the desulfurization denitration method, is realized integration desulfurization denitration, be can reach desulfuration efficiency 95%, denitration efficiency 90%.
Description
Technical field
The invention belongs to field of Environment Protection, in particular it relates to which a kind of industrial smoke coordinated desulfurization method of denitration, can be achieved industry
SO2, NOx simultaneous removing in fume emission.
Background technology
At present, environmental pollution and using energy source problem have seriously threatened environment for the survival of mankind and mankind itself
Health.At present in the world the enterprise such as most thermal power plants, cement, chemical industry, weaving all using thermal coal as fuel, and SO2 with
NOx pollution 90% comes from burning of coal.Pollution of the pollutant to ecological environment is increasingly subject to the close of people in combustion product
Concern.
At present, it is to utilize traditional desulfurization technology (FGD) and selectivity using more extensive simultaneous SO_2 and NO removal technology
The combination of catalytic reduction technique (SCR) is realized.But desulphurization and denitration technology is single use, equipment is complicated, runs and invests
It is costly, easily cause secondary pollution.Using desulfurization and denitrification integral process then compact conformation, operation and investment cost have dropped
Low, efficiency can also be improved, and these factors also just decide that flue gas synchronized desulfuring and denitrifying will turn into a kind of following development trend.
The content of the invention
For defect of the prior art, it is an object of the invention 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 carried out, realize that integrated desulfurization takes off
Pin, makes simple desulphurization denitration device structure, reduction investment and operating cost, reduces secondary pollution.
The purpose of the present invention is achieved through the following technical solutions：
The invention provides a kind of industrial smoke coordinated desulfurization method of denitration, flue gas passes sequentially through three desulphurization denitration units
Carry out after purified treatment, be emitted into air.
Preferably, the flue gas passes sequentially through three desulphurization denitration units progress purified treatments and comprised the following steps：
A1, flue gas enter the first desulphurization denitration unit, in the first desulphurization denitration unit, are merged and aoxidized using organic amine
Method, organic amine and fusion oxidant and the SO in flue gas2、NO、NO2Reaction is sufficiently mixed, first step desulphurization denitration is realized；The party
Method is wet desulphurization, and desulfuration efficiency is up to more than 80%, and denitration efficiency is up to more than 70%.Remaining flue gas and organic after reaction
Amine decomposes the ammonia produced and together flows to the second desulphurization denitration unit；
A2, in the second desulphurization denitration unit, using catalytic reduction method, using the ammonia described in step A1 as reducing agent,
With the SO in flue gas2、NO、NO2Occur catalytic reduction reaction on the surface of solid catalyst, generate S, N2Deng material, second is realized
Walk desulphurization denitration；The method is dry desulfurization denitration, and desulfuration efficiency is 10~12%, and denitration efficiency is 15~17%；The method is abundant
The ammonia that make use of first step desulphurization denitration to produce, had both improved the utilization ratio of desulfurization denitrification agent, and had prevented the escaping of ammonia to be brought again
Secondary pollution.
A3, through step A2 react after remaining flue gas enter the 3rd desulphurization denitration unit, in the 3rd desulphurization denitration unit
Using reactive absorption method, alkaline absorbent is sufficiently mixed with flue gas, by absorbing reaction, the 3rd step desulphurization denitration is realized.Should
The desulfuration efficiency of method is in 3~7%, denitration efficiency 3~7%.
Preferably, in the step A1, the organic amine and fusion oxidant are sufficiently mixed reaction with flue gas and are specially：It is logical
Fusion oxidant is crossed to the SO in flue gas2, NO carry out oxidation reaction generation SO3、NO2, then pass through organic amine and SO3Reaction life
Produce ammonium sulfate；Reduced and NO, NO with organic amine is passed through2The N that reaction production can be discharged directly2、CO2。
Preferably, the percentage by weight of the organic amine in aqueous is 1%~19%, and fusion oxidant is in the aqueous solution
In percentage by weight 0.1%~1%；The fusion oxidant is the highly reactive form of oxygen agent voluntarily developed, and is to include sub- chlorine
Hydrochlorate, hypochlorite, the confection of perofskite type oxide, are made up of following element：Oxygen, sodium, calcium, chlorine, manganese and magnesium.It is described
The percentage by weight of organic amine is 1%~19%, and when the percentage by weight of fusion oxidant is 0.1%~1%, efficiency is optimal.
The present invention has more preferably oxidation effect using the highly reactive form of oxygen agent voluntarily developed than common active oxidizer
Really, the efficiency of desulphurization denitration is improved.
Preferably, in the step A1, organic amine and fusion oxidant are mixed by spraying mode with flue gas.
Preferably, in step A2, the solid catalyst is alkali metal oxide catalyst.
Preferably, in step A3, the absorbing reaction is specially the SO first in flue gas2、NO2Be dissolved in water generation sulfurous acid,
Nitric acid HNO3, nitrous acid HNO2, and NO and NO in gas phase2React the N of generation2O3It is dissolved in after water and generates HNO2；Then generate
HSO3、HNO3And HNO2Occur neutralization reaction with alkaline adsorbent and ultimately generate sulphite, NO3-N and NO2-N.
Preferably, the alkaline adsorbent is NaOH, the alkaline mixed solution of calcium hydroxide, the pH of alkaline adsorbent
It is worth for 10~14.
Preferably, the alkaline adsorbent is mixed by spraying mode with flue gas.
The present invention uses three step desulfurization denitration methods, including organic amine fusion oxidizing process, catalytic reduction method, reactive absorption method
Three steps.Described organic amine fusion oxidizing process is the oxidation sweetening method of denitration using organic amine and fusion oxidant；It is described to urge
It is the method for decomposing the Ammonia reducing agent produced and catalyst synergy desulphurization denitration using organic amine to change reducing process；It is described anti-
It is the method for being absorbed, being reacted to SO2, NOx using alkaline absorbent to answer absorption process, realizes the desulphurization denitration to flue gas.This
Invention desulfuration efficiency can reach 93~95%, and denitration efficiency reaches 87~90%.
Compared with prior art, the present invention has following beneficial effect：
1st, the coordinated desulfurization method of denitration that the present invention is used, can be integrated in a set of equipment by desulfurization denitration method each unit
In, realize the simultaneous removing of SO2, nitrogen oxide NOx.
2nd, the present invention by three step desulfurization denitration methods, realize integration desulfurization denitration, can reach desulfuration efficiency 93~
95%, denitration efficiency 87~90%.
3rd, desulphurization denitration device structure is simple needed for the present invention, can substantially reduce investment and operating cost.
4th, in the second step desulphurization denitration of the inventive method, the ammonia of first step desulphurization denitration generation is taken full advantage of, was both carried
The high utilization ratio of desulfurization denitrification agent, the secondary pollution for preventing the escaping of ammonia to be brought again, beneficial to environmental protection.
Brief description of the drawings
By reading the detailed description made with reference to the following drawings to non-limiting example, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 is industrial smoke coordinated desulfurization method of denitration flow chart.
Embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the ordinary skill of this area
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection domain.
Embodiment 1
As shown in figure 1, flue gas enters after coordinated desulfurization denitration cleaning equipment, three desulphurization denitration units are passed sequentially through,
After purified treatment, it is emitted into air.
Specific implementation step is as follows：
1st, flue gas initially enters the first desulphurization denitration unit, in the first desulphurization denitration unit, and organic amine and fusion are aoxidized
Agent is sufficiently mixed reaction, SO by spray mode and flue gas2Removing more than 80%, nitrogen oxide NOx (are NO and NO2) removing
After more than 70%, remaining flue gas and organic amine decompose the ammonia produced and together flow to the second desulphurization denitration unit；
2nd, in the second desulphurization denitration unit, SO2, NOx in flue gas (are NO and NO2) the surface of fixed catalyst with
Organic amine decomposes the ammonia generation catalytic reduction reaction produced in first module, and desulfuration efficiency is better than 10%, and denitration efficiency is better than
15%；
3rd, last, flue gas enters the 3rd desulphurization denitration unit, in the 3rd unit neutral and alkali absorbent by spraying mode, with
Flue gas is sufficiently mixed, by absorbing reaction, can remove SO2About 5%, remove NOx about 5%；
4th, the final flue gas through three step purified treatments by smoke stack emission into air.
The percentage by weight of the organic amine in aqueous is in 1%~19%, the weight of fusion oxidant in aqueous
Percentage is measured 0.1%~1%；The fusion oxidant is the highly reactive form of oxygen agent voluntarily developed.
The solid catalyst is alkali metal oxide catalyst.
The alkaline adsorbent is NaOH, the alkaline mixed solution of calcium hydroxide, and the alkaline adsorbent pH value is
10~14.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substance of the present invention.
Claims (8)
1. a kind of industrial smoke coordinated desulfurization method of denitration, it is characterised in that methods described is led to successively including flue gas by flue gas
Cross three desulphurization denitration units to carry out after purified treatment, be emitted into air；
The flue gas passes sequentially through three desulphurization denitration units progress purified treatments and specifically includes following steps：
A1, flue gas enter the first desulphurization denitration unit, in the first desulphurization denitration unit, merge oxidizing process using organic amine, have
Machine amine and fusion oxidant and the SO in flue gas2、NO、NO2Reaction is sufficiently mixed, first step desulphurization denitration is realized；It is remaining after reaction
Flue gas and organic amine decompose the ammonia produced and together flow to the second desulphurization denitration unit；
A2, in the second desulphurization denitration unit, using catalytic reduction method, using the ammonia described in step A1 as reducing agent, with cigarette
SO in gas2、NO、NO2Occur catalytic reduction reaction on the surface of solid catalyst, realize second step desulphurization denitration；
A3, through step A2 react after remaining flue gas enter the 3rd desulphurization denitration unit, used in the 3rd desulphurization denitration unit
Reactive absorption method, alkaline absorbent is sufficiently mixed with flue gas, by absorbing reaction, realizes the 3rd step desulphurization denitration；
The fusion oxidant is to include the confection of chlorite, hypochlorite, perofskite type oxide.
2. industrial smoke coordinated desulfurization method of denitration according to claim 1, it is characterised in that in the step A1, institute
State organic amine and fusion oxidant is sufficiently mixed reaction with flue gas and is specially：By merging oxidant to the SO in flue gas2, NO enters
Row oxidation reaction generates SO respectively3、NO2, then pass through organic amine and SO3Reaction production ammonium sulfate, and by organic amine reduction with
NO、NO2Reaction produces N respectively2、CO2。
3. industrial smoke coordinated desulfurization method of denitration according to claim 1, it is characterised in that in the step A1, institute
State organic amine and fusion oxidant is mixed by spray mode with flue gas.
4. the industrial smoke coordinated desulfurization method of denitration according to Claims 2 or 3, it is characterised in that the organic amine exists
Percentage by weight in the aqueous solution is 1%~19%, and the percentage by weight of fusion oxidant in aqueous is 0.1%~1%.
5. industrial smoke coordinated desulfurization method of denitration according to claim 1, it is characterised in that in step A2, described solid
Body catalyst is alkali metal oxide catalyst.
6. industrial smoke coordinated desulfurization method of denitration according to claim 1, it is characterised in that in step A3, described to inhale
It is specially the SO first in flue gas to receive reaction2、NO2It is dissolved in water generation sulfurous acid, nitric acid HNO3, nitrous acid HNO2, and NO and NO2
React the N of generation2O3It is dissolved in after water and generates HNO2；Then the HSO generated3、HNO3And HNO2Occur to neutralize instead with alkaline adsorbent
Sulphite, NO3-N and NO2-N should be ultimately generated.
7. the industrial smoke coordinated desulfurization method of denitration according to claim 1 or 6, it is characterised in that the alkaline adsorption
Agent is NaOH, the alkaline mixed solution of calcium hydroxide, and the alkaline adsorbent pH value is 10~14.
8. industrial smoke coordinated desulfurization method of denitration according to claim 1, it is characterised in that the alkaline adsorbent is led to
Spray mode is crossed to mix with flue gas.
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| 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 |
| CN107261805B (en) * | 2017-08-22 | 2020-10-02 | 周凯 | Hydrazine solution special for chimney flue gas desulfurization and denitrification and preparation method thereof |
| CN110127641B (en) * | 2018-02-02 | 2021-02-05 | 中国科学院过程工程研究所 | Method for recovering nitrite from desulfurization and denitrification 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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| CN101073741A (en) * | 2007-04-06 | 2007-11-21 | 东南大学 | Method and apparatus for combined removing sulfur-dioxide and nitrogenoxide by mixed solution |
| CN102371113A (en) * | 2010-08-27 | 2012-03-14 | 深圳市翔宇环保科技有限公司 | Flue gas purifying treatment method and system |
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| CN101073741A (en) * | 2007-04-06 | 2007-11-21 | 东南大学 | Method and apparatus for combined removing sulfur-dioxide and nitrogenoxide by mixed solution |
| CN101053746A (en) * | 2007-06-06 | 2007-10-17 | 北京大学 | Method for ethylene glycol removing SOx (X=2 or 3) in flue gas |
| CN102371113A (en) * | 2010-08-27 | 2012-03-14 | 深圳市翔宇环保科技有限公司 | Flue gas purifying treatment method and system |
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