CN109364718A - A kind of combustion product gases desulphurization denitration processing method - Google Patents
A kind of combustion product gases desulphurization denitration processing method Download PDFInfo
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- CN109364718A CN109364718A CN201811497889.3A CN201811497889A CN109364718A CN 109364718 A CN109364718 A CN 109364718A CN 201811497889 A CN201811497889 A CN 201811497889A CN 109364718 A CN109364718 A CN 109364718A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/507—Sulfur oxides by treating the gases with other liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/11—Air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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Abstract
The invention discloses a kind of combustion product gases desulphurization denitration processing method the following steps are included: combustion product gases are passed through in gas mixer, and be passed through air into mixing arrangement, combustion product gases and air is made to carry out oxidation reaction in mixing arrangement；Subsequently into progress denitration dust collecting reaction in air cleaning device；Above step is repeated, until combustion product gases reach discharge standard, completion denitration process；Finally the combustion product gases after denitration process are cleaned using the water added with desulfuration reagent, combustion product gases is made to generate desulphurization reaction in the process of cleaning.Using air and water cascade desulphurization denitration the concentration of oxynitrides is greatly reduced in particulate matter in combustion product gases by the present invention while that is, dust removes clean, the method for quoting a variety of wet desulphurizations sloughs sulfide, and work efficiency is high and environmental protection.
Description
Technical field
The invention belongs to boiler of power plant desulphurization denitration technical fields, and in particular to a kind of combustion product gases desulphurization denitration processing side
Method.
Background technique
The situation and problem that combustion product gases are administered: China's non-renewable energy is greatly mostly from fire coal at present, and burning of coal can not
The pernicious gases such as particulate matter, nitric oxide, nitrogen dioxide, sulfur dioxide can be generated with avoiding, pollutes environment.It was opened from 2012
Begin, China has promulgated new a collection of flue gas fire coal environmental protection standard successively, and it is very severe to execute requirement.Traditional governance approach is managed not to the utmost
Think or defective or operating cost itself is very high.If bag-type dust is difficult to remove particulate matter more smaller than filter opening diameter,
Electrostatic precipitation is easy dust accumulation and blocks, and ammonia catalysis method denitration is with high costs etc..
Although the prior art can effectively remove the dust in air, the oxidation removed in gas with dust cannot be synchronized
The pernicious gases such as nitrogen, nitrogen dioxide, sulfur dioxide.
Summary of the invention
For the technical problems in the prior art, the present invention provides a kind of combustion product gases desulphurization denitration processing sides
Method improves working efficiency its object is to reduce system for desulfuration and denitration investment.
In order to solve the above technical problems, the present invention is achieved by the following technical programs:
A kind of combustion product gases desulphurization denitration processing method, comprising the following steps:
S1, combustion product gases are passed through in gas mixer, and are passed through air into mixing arrangement, make combustion product gases and sky
Gas carries out oxidation reaction in mixing arrangement；
It is anti-that combustion product gases and reaction product after reacting in S2, S1 enter progress denitration dust collecting in air cleaning device
It answers；
S3, S1 and S2 is repeated, until combustion product gases reach discharge standard, completion denitration dust collecting processing；
S4, the combustion product gases after denitration process are cleaned using the water added with desulfuration reagent, combustion product gases is made to exist
Desulphurization reaction is generated in cleaning process.
Further, in the S1, using concentration nitric oxide production in combustion product gases as reference, by nitric oxide and air it
Than for 1:(3~5) ratio be passed through air, be sufficiently mixed combustion product gases and air in gas mixer, make the cigarette that burns
Nitric oxide in gas is converted into nitrogen dioxide after reacting with the oxygen in air.
Further, be provided with air control valve on the gas mixer, air control valve be used to control air into
The flow and flow rate entered.
Further, in the S2, air cleaning device uses supercentrifuge, and supercentrifuge is by the solid in air
Or liquid micronic dust or micronic dust group accelerate, and disengage it from the viscous force of air.
Further, it in the S3, repeats S1 and S2 and at least completes denitration process three times.
Further, in the S4, desulfuration reagent is lime, magnesia or soda lime.
Further, in the S2, the inner wall of air cleaning device is tubular structure.
Further, the inner wall lower position of air cleaning device is in inversion cone tubular structure.
Compared with prior art, the present invention at least has the advantages that the present invention using air and water cascade desulfurization
The concentration of oxynitrides is greatly reduced in particulate matter in combustion product gases by denitration while that is, dust removes clean, quoted more
The method of kind wet desulphurization sloughs sulfide, and work efficiency is high and environmental protection.The present invention realizes dust-removal and desulfurizing denitrification integral, technique
Process is short, and equipment investment is few, and operating cost is low, wide adaptability.The present invention administers coal-burning power plant and all kinds of fire coal boiler fumes,
The smoke gas treatment of the industrial enterprises such as steel mill and other air cleanings have a very important significance.
It further, is 1:(3 by the ratio between nitric oxide and air using concentration nitric oxide production in combustion product gases as reference
~5) ratio is passed through air, so that more fully mixed.
Further, air cleaning device use supercentrifuge, supercentrifuge by air solid or liquid it is micro-
Dirt or micronic dust group accelerate, and disengage it from the viscous force of air, improve cleaning efficiency.
Further, the inner wall of air cleaning device is tubular structure, is cleaned more thorough.
Further, the inner wall lower position of air cleaning device improves cleaning efficiency in cone tubular structure is inverted.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be to technical side of the invention
Case is clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than whole realities
Apply example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without making creative work
Every other embodiment, shall fall within the protection scope of the present invention.
A kind of combustion product gases desulphurization denitration processing method of the present invention, including denitration and desulfurization two parts.
As a certain embodiment of the invention, denitration process method is as follows:
S1: oxidation reaction:
Combustion product gases enter in gas mixer from the gas inlet of denitration desulfurization and dedusting module, gas mixer
Top is equipped with air control valve, and air control valve is used to control the flow and flow rate of air entrance, with nitric oxide in flue gas
Concentration be reference, by the ratio between nitric oxide and air be 1:(3~5) ratio be passed through air, the air from air intlet into
Enter gas mixer, be sufficiently mixed combustion product gases and external air in gas mixer, the purpose is to enable burning cigarette
Nitric oxide in gas is reacted with the oxygen in air is converted into nitrogen dioxide.Overregulate the sky installed above gas mixer
Gas regulating valve come control air entrance flow and flow rate.
NO+O2→NO2
S2: denitration dust collecting reaction:
The nitrogen dioxide contained in the nitrogen dioxide and air that S1 is generated is reacted with flue gas stream with water, nitrogen dioxide and sky
Water reaction in gas cleaner, generates dust technology and a small amount of new nitric oxide, the concentration of NOx is greatly lowered very much at this time.
3NO2+H2O=2HNO3+NO
4NO2+2H2O+O2=4HNO3
Air cleaning device using supercentrifuge by air solid or liquid micronic dust or micronic dust group accelerate, make solid
Or liquid micronic dust or micronic dust group accelerate to obtain enough kinetic energy, are detached from the viscous force of air.As a certain preferred reality of the invention
Example is applied, the inner wall of air cleaning device is tubular structure, and inner wall lower position is in inversion cone tubulose.
Using multistage denitration dust collecting, steps are as follows:
S3: multistage denitration dust collecting reaction:
The gas of combustion product gases and generation after step 2 enters next stage gas mixing units and air cleaning dress
It sets, repeats the operating process of S1 and S2, and so on, flue gas NOxConcentration can decline step by step until qualified discharge.
Theoretically, above-mentioned S2 conversion process can only about 3/5 conversion of nitric oxide gas at target product.Due to newly-generated
With the presence of nitric oxide in product, combustion product gases must repeat same process through next stage denitration desulfurization and dedusting cell processing.
Flue gas is cleaned step by step in this way, and the decline of nitric oxide concentration step, can be to 5 milligrams every cubic metre or less up to very low level.
As a certain embodiment of the invention, desulfurization process is following (i.e. S4):
The combustion product gases after dedusting out of stock in S3 are cleaned using the water added with desulfuration reagent, to make the cigarette that burns
Gas generates desulphurization reaction in the process of cleaning.
As a certain preferred embodiment of the invention, desulfuration reagent is lime, magnesia or soda lime.
Desulfurization effect in S4:
Middle section desulfurization test is done using limewash as absorbent with air cleaning method.Sulfur-containing smoke gas with 35 meters of speed per second into
Enter denitration desulfation dust-extraction device, through first order air cleaning cell processing, SO2Concentration is down to 98ppb from 2100ppb, through second
After grade and third level air cleaning unit (rear two-stage absorbent is water), drop to 37ppb (detecting instrument THERMO
Scientific Model 48i-TLE), desulfurization degree is up to 98%.
The present invention realizes dust-removal and desulfurizing denitrification integral, and process flow is short, and equipment investment is few, and operating cost is low, adaptability
Extensively, the small power plant dust-removal and desulfurizing denitration needs for not setting bag-type dust, dust removal efficiency >=95% are adapted to.
Claims (8)
1. a kind of combustion product gases desulphurization denitration processing method, which comprises the following steps:
S1, combustion product gases are passed through in gas mixer, and are passed through air into mixing arrangement, combustion product gases and air is made to exist
Oxidation reaction is carried out in mixing arrangement；
Combustion product gases and reaction product after reacting in S2, S1, which enter, carries out denitration dust collecting reaction in air cleaning device；
S3, S1 and S2 is repeated, until combustion product gases reach discharge standard, completion denitration dust collecting processing；
S4, the combustion product gases after denitration process are cleaned using the water added with desulfuration reagent, is cleaning combustion product gases
Desulphurization reaction is generated in the process.
2. combustion product gases desulphurization denitration processing method according to claim 1, which is characterized in that in the S1, with burning
In flue gas nitric oxide production concentration be reference, by the ratio between nitric oxide and air be 1:(3~5) ratio be passed through air, make to fire
It burns flue gas and air is sufficiently mixed in gas mixer, react the nitric oxide in combustion product gases with the oxygen in air
After be converted into nitrogen dioxide.
3. combustion product gases desulphurization denitration processing method according to claim 2, which is characterized in that the gas mixer
On be provided with air control valve, air control valve is used to control the flow and flow rate of air entrance.
4. combustion product gases desulphurization denitration processing method according to claim 1, which is characterized in that in the S2, air is clear
Cleaning device use supercentrifuge, supercentrifuge by air solid or liquid micronic dust or micronic dust group accelerate, disengage it from
The viscous force of air.
5. combustion product gases desulphurization denitration processing method according to claim 1, which is characterized in that in the S3, repeat S1
Denitration process is at least completed three times with S2.
6. combustion product gases desulphurization denitration processing method according to claim 1, which is characterized in that in the S4, desulfurization examination
Agent is lime, magnesia or soda lime.
7. combustion product gases desulphurization denitration processing method according to claim 1, which is characterized in that in the S2, air is clear
The inner wall of cleaning device is tubular structure.
8. combustion product gases desulphurization denitration processing method according to claim 7, which is characterized in that air cleaning device it is interior
Wall lower position is in inversion cone tubular structure.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1932579A1 (en) * | 2006-12-07 | 2008-06-18 | Mitsubishi Heavy Industries, Ltd. | Method and device for removing mercury |
| CN104689694A (en) * | 2015-03-05 | 2015-06-10 | 广州市合联科技发展有限公司 | Denitration, desulfurization and dust-removal device and method applying same |
| CN204637948U (en) * | 2015-03-05 | 2015-09-16 | 广州市合联科技发展有限公司 | The device of combustion product gases denitration desulfurization and dedusting |
-
2018
- 2018-12-07 CN CN201811497889.3A patent/CN109364718A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1932579A1 (en) * | 2006-12-07 | 2008-06-18 | Mitsubishi Heavy Industries, Ltd. | Method and device for removing mercury |
| CN104689694A (en) * | 2015-03-05 | 2015-06-10 | 广州市合联科技发展有限公司 | Denitration, desulfurization and dust-removal device and method applying same |
| CN204637948U (en) * | 2015-03-05 | 2015-09-16 | 广州市合联科技发展有限公司 | The device of combustion product gases denitration desulfurization and dedusting |
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