CN105727713A - Method of using desulfurizing and denitrifying agent to purify flue gas - Google Patents

Method of using desulfurizing and denitrifying agent to purify flue gas Download PDF

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Publication number
CN105727713A
CN105727713A CN201610165009.7A CN201610165009A CN105727713A CN 105727713 A CN105727713 A CN 105727713A CN 201610165009 A CN201610165009 A CN 201610165009A CN 105727713 A CN105727713 A CN 105727713A
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flue gas
denitrification agent
desulfurization denitrification
desulfurization
mol ratio
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孙若浩
李守顺
孙刚
王兵
李蔚
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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
    • 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
    • B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
    • 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Treating Waste Gases (AREA)

Abstract

Provided is a method of using a desulfurizing and denitrifying agent to purify flue gas. The method includes: enabling a solid powdery desulfurizing and denitrifying agent to generate aerogel through a gas dispersing device; injecting the aerogel into a desulfurizing and denitrifying reaction area to mix with to-be-treated flue gas; reacting under gas-phase conditions to achieve the objective of removing SOx and NOx in the flue gas. By using the method, desulfurizing and denitrifying efficiency reaches higher than 95%.

Description

A kind of method using desulfurization denitrification agent that flue gas is purified
Technical field
The present invention relates to a kind of desulfurization denitrification agent for dry fume gas phase purifying, particularly to a kind of efficient air colloidal sol type compound desulfurization denitrification agent for dry fume gas phase purifying, belong to gas cleaning processing technology field.
Background technology
Along with China's expanding economy, the environmental pollution that mass energy consumption brings is also increasingly severe.Air is caused severe contamination by the harmful substances such as flue dust contained in the flue gas that burning produces, sulfur dioxide, nitrogen oxides.
Flue gas desulfurization is to control the flue gas desulfurization technique that Sulfur Dioxide In The Atmosphere concentration of emission is most effective, most widely used with total amount at present.Namely flue gas desulfurization adopt the methods such as chemistry, physics and biology by the SO in flue gas2Fixed and removed.Flue gas desulfurization technique has hundreds of, and what put into application at present also has tens kinds, and by the dry and wet form of desulfurization product, flue gas desulfurization can be divided into again wet method, semidry method and dry flue gas desulphurization.The most ripe in flue gas desulfurization technique is Wet technique, account for the 85% of total installed capacity amount, wherein account for more than 35% with Wet Limestone/gypsum for master contract, additionally, also have ammonia ammonium sulphate process, MgO method, activated carbon method, sodium alkali, electronic catalytic oxidizing process, Dual alkali etc..Divide by the kind of desulfurization denitrification agent, following five kinds of methods can be divided into: with CaCO3Calcium method based on (limestone), the magnesium processes based on MgO, with Na2SO3Based on sodium method, the ammonia process based on NH3, the organic alkaline process based on organic base.
Relevant NOxControl method have be divided into burning before, burning neutralize burning latter three kinds.In burning, denitration technology is referred to as low NOxCombustion technology, after burning, denitration technology is referred to as gas denitrifying technology.It is that selective catalytic reduction (SCR), SNCR method (SNCR) and SCR and SNCR mix denitration technology that gas denitrifying technology is applied more at present, and the denitrfying agent of employing is mainly carbamide, ammonia and liquefied ammonia.
At present about flue gas desulfurization and denitrification technology, the technique adopted both at home and abroad is respectively provided with desulphurization and denitration device in boiler exit gas section mostly, this staged care purification style exists that floor space is big, system complex and resistance is big, investment and running cost is high, flue gas system stability control to require high, produce a large amount of solid-liquid garbage and cause secondary pollution and the problem such as desulfurization denitrification agent accumulating is dangerous.Flue gas and desulfurizing and denitrifying technique is few with its counter investment, technique simple, increasingly comes into one's own.Realize flue gas and desulfurizing and denitrifying and have that enforcement is fast, invest the advantages such as low especially, there is good economy and environmental benefit.
Summary of the invention
The problem that invention to solve
The present invention is directed to the deficiency of existing desulphurization denitration technology, it is provided that a kind of aerosol type compound desulfurization denitrification agent for dry fume gas phase purifying, it is achieved combustion product gases purifies removes SOxAnd NOx, to overcome existing staged care to purify SOxAnd NOxMode exists that occupation area of equipment is big, system complex and resistance is big, investment and running cost is high, flue gas system stability control to require high, produce a large amount of solid-liquid garbage and cause secondary pollution and the problem such as desulfurization denitrification agent accumulating is dangerous.
For solving the scheme of problem
According to the present invention, it is provided that a kind of high-efficiency desulfurization denitrfying agent for dry fume gas phase purifying, one or two or more kinds in component A of described high-efficiency desulfurization denitrfying agent, and the combination of a kind of or two kinds of any ratios in component B；Wherein
Component A includes: carbohydrazide, melamine isocyanates, ammelide
Component B includes: peroxidating phosphinylidyne ammonia, SODIUM PERCARBONATE.
Described high-efficiency desulfurization denitrfying agent and SO in pending flue gas2The mol ratio of response magnitude is (0.1～2): 1, NO in described high-efficiency desulfurization denitrfying agent and pending flue gasxThe mol ratio of response magnitude is (0.2～1.5): 1.
Described high-efficiency desulfurization denitrfying agent and SO in pending flue gas2The mol ratio of response magnitude is (0.5～1.2): 1, NO in described high-efficiency desulfurization denitrfying agent and pending flue gasxThe mol ratio of response magnitude is (0.6～1.1): 1.
Described high-efficiency desulfurization denitrfying agent is solid particle, and particle diameter is 20～150 μm.
The particle diameter of described high-efficiency desulfurization denitrfying agent is 60～90 μm.
Present invention also offers a kind of method using desulfurization denitrification agent that flue gas is purified, it comprises the steps:
(1), preparation high-efficiency desulfurization denitrfying agent；
One or two or more kinds in component A of described high-efficiency desulfurization denitrfying agent, and the combination of a kind of or two kinds of any ratios in component B；
Component A includes: carbohydrazide, melamine isocyanates, ammelide
Component B includes: peroxidating phosphinylidyne ammonia, SODIUM PERCARBONATE；
(2), the high-efficiency desulfurization denitrfying agent in step (1) is generated aerosol in gas dispersion apparatus；
(3), by middle for step (2) reaction zone that aerosol implantation temperature is 400～1000 DEG C generated, mix with pending flue gas, react 1～3s.
In described step (3), SO in high-efficiency desulfurization denitrfying agent and pending flue gas2The mol ratio of response magnitude is (0.1～2): 1, NO in described high-efficiency desulfurization denitrfying agent and pending flue gasxThe mol ratio of response magnitude is (0.2～1.5): 1.
In described step (3), SO in high-efficiency desulfurization denitrfying agent and pending flue gas2The mol ratio of response magnitude is (0.5～1.2): 1, NO in described high-efficiency desulfurization denitrfying agent and pending flue gasxThe mol ratio of response magnitude is (0.6～1.1): 1.
In described step (1), high-efficiency desulfurization denitrfying agent is solid particle, and particle diameter is 20～150 μm.
The particle diameter of described high-efficiency desulfurization denitrfying agent is 60～90 μm.
The injection pressure of described high-efficiency desulfurization denitrfying agent is-10～70kpa, is beneficial to fully mix with pending flue gas after desulfurization denitrification agent enters reaction zone.
Reaction zone temperature in described step (3) is 500～900 DEG C.
In described step (3), the response time is 1.5～2s.
The effect of invention
Gas efficiency of the present invention is high, and denitrification efficiency reaches more than 95%；
The present invention is compared with existing desulfurization and denitration technology, and technological process is short, and equipment volume is little, pollutes without secondary waste thing, and operating cost is low, good in economic efficiency；
Under gas phase condition of the present invention, response speed is fast, and quickly, adaptability is good in system fading margin response, can be used for the gas cleaning of various boiler and Industrial Stoves and processes.
Detailed description of the invention
Below in conjunction with embodiment, technical scheme is described further, but institute of the present invention protection domain is not limited to this.
Pending flue gas described in embodiment is coal steam-electric plant smoke, SO2It is about 3000mg/m3, NOxIt is about 800mg/m3。
Embodiment 1
A kind of for dry fume gas phase purifying combined desulfurization and denitration agent, constituent and using method include
Following steps:
Carbohydrazide 30.2kg, melamine isocyanates 60.8kg, ammelide 530kg, the mixture of peroxidating phosphinylidyne ammonia 69kg and the desulfurization denitrification agent of a kind of compound are injected reaction zone, desulfurization denitrification agent and the SO in flue gas2Mol ratio is 0.85: 1, the NO in desulfurization denitrification agent and flue gasxMol ratio is 1: 1, and injection pressure is 35kpa；
When reaction zone temperature is 750 DEG C, after reaction 1.5s,；
SO in flue gas before and after flue gas analyzer detection processes2Concentration, calculates SO2Removal efficiency reaches 95.4%, NOxRemoval efficiency reaches 96.3%.
Embodiment 2
As described in Example 1 for the desulfurization denitrification agent of flue gas gas phase desulfurization and using method thereof, being different in that: be 920 DEG C at reaction zone temperature, the response time is 2s.
SO in flue gas before and after flue gas analyzer detection processes2Concentration, calculates SO2Removal efficiency reaches 98.0%, NOxRemoval efficiency reaches 98.3%.
Embodiment 3
A kind of for dry fume gas phase purifying combined desulfurization and denitration agent, constituent and using method include
Following steps:
Carbohydrazide 40kg, melamine isocyanates 60kg, the mixture of peroxidating phosphinylidyne ammonia 60kg and the desulfurization denitrification agent of a kind of compound are injected reaction zone, desulfurization denitrification agent and the SO in flue gas2Mol ratio is 0.9: 1, the NO in desulfurization denitrification agent and flue gasxMol ratio is 1: 1, and injection pressure is 27kpa；
When reaction zone temperature is 700 DEG C, after reaction 1.5s,；
SO in flue gas before and after flue gas analyzer detection processes2Concentration, calculates SO2Removal efficiency reaches 96.8%, NOxRemoval efficiency reaches 97.2%.
Embodiment 4
A kind of for dry fume gas phase purifying combined desulfurization and denitration agent, constituent and using method comprise the steps:
Melamine isocyanates 500kg, the mixture of SODIUM PERCARBONATE 60kg and the desulfurization denitrification agent of a kind of compound are injected reaction zone, desulfurization denitrification agent and the SO in flue gas2Mol ratio is 0.9: 1, the NO in desulfurization denitrification agent and flue gasxMol ratio is 1: 1, and injection pressure is 20kpa；
When reaction zone temperature is 650 DEG C, after reaction 1.5s,；
SO in flue gas before and after flue gas analyzer detection processes2Concentration, calculates SO2Removal efficiency reaches 95.2%, NOxRemoval efficiency reaches 96.2%.
Embodiment 5
A kind of for dry fume gas phase purifying combined desulfurization and denitration agent, constituent and using method comprise the steps:
Carbohydrazide 200kg, the mixture of SODIUM PERCARBONATE 60kg and the desulfurization denitrification agent of a kind of compound are injected reaction zone, injects reaction zone, desulfurization denitrification agent and the SO in flue gas2Mol ratio is 0.9: 1, and injection pressure is-8kpa；
When reaction zone temperature is 580 DEG C, after reaction 1.3s,；
SO in flue gas before and after flue gas analyzer detection processes2Concentration, calculates SO2Removal efficiency reaches 98.8%, NOxRemoval efficiency reaches 98.2%.

Claims (13)

1. for a desulfurization denitrification agent for dry fume gas phase purifying, one or two or more kinds in component A of described desulfurization denitrification agent, and the combination of a kind of or two kinds of any ratios in component B；Wherein
Component A includes: carbohydrazide, melamine isocyanates, ammelide
Component B includes: peroxidating phosphinylidyne ammonia, SODIUM PERCARBONATE.
2. desulfurization denitrification agent according to claim 1, described desulfurization denitrification agent and SO in pending flue gas2The mol ratio of response magnitude is (0.1～2): 1, NO in described desulfurization denitrification agent and pending flue gasxThe mol ratio of response magnitude is (0.2～1.5): 1.
3. desulfurization denitrification agent according to claim 2, described desulfurization denitrification agent and SO in pending flue gas2The mol ratio of response magnitude is (0.5～1.2): 1, NO in described desulfurization denitrification agent and pending flue gasxThe mol ratio of response magnitude is (0.6～1.1): 1.
4. the desulfurization denitrification agent according to any one of claim 1-3, described desulfurization denitrification agent is solid particle, and particle diameter is 20～150 μm.
5. desulfurization denitrification agent according to claim 4, the particle diameter of described desulfurization denitrification agent is 60～90 μm.
6. using the method that flue gas is purified by the desulfurization denitrification agent as according to any one of claim 1-5, it comprises the steps:
(1), preparation desulfurization denitrification agent；
One or two or more kinds in component A of described desulfurization denitrification agent, and the combination of a kind of or two kinds of any ratios in component B；
Component A includes: carbohydrazide, melamine isocyanates, ammelide
Component B includes: peroxidating phosphinylidyne ammonia, SODIUM PERCARBONATE；
(2), the desulfurization denitrification agent in step (1) is generated aerosol in gas dispersion apparatus；
(3), by middle for step (2) reaction zone that aerosol implantation temperature is 400～1000 DEG C generated, mix with pending flue gas, react 1～3s.
7. the method that flue gas is purified by use desulfurization denitrification agent according to claim 6, in described step (3), SO in desulfurization denitrification agent and pending flue gas2The mol ratio of response magnitude is (0.1～2): 1, NO in described desulfurization denitrification agent and pending flue gasxThe mol ratio of response magnitude is (0.2～1.5): 1.
8. the method that flue gas is purified by use desulfurization denitrification agent according to claim 7, in described step (3), SO in desulfurization denitrification agent and pending flue gas2The mol ratio of response magnitude is (0.5～1.2): 1, NO in described desulfurization denitrification agent and pending flue gasxThe mol ratio of response magnitude is (0.6～1.1): 1.
9. the method that flue gas is purified by the use desulfurization denitrification agent according to any one of claim 6-8, in described step (1), desulfurization denitrification agent is solid particle, and particle diameter is 20～150 μm.
10. the method that flue gas is purified by use desulfurization denitrification agent according to claim 9, the particle diameter of described desulfurization denitrification agent is 60～90 μm.
11. the method that flue gas is purified by the use desulfurization denitrification agent according to any one of claim 6-8, the injection pressure of described desulfurization denitrification agent is-10～70kpa, is beneficial to fully mix with pending flue gas after desulfurization denitrification agent enters reaction zone.
12. the method that flue gas is purified by the use desulfurization denitrification agent according to any one of claim 6-8, the reaction zone temperature in described step (3) is 500～900 DEG C.
13. the method that flue gas is purified by the use desulfurization denitrification agent according to any one of claim 6-8, in described step (3), the response time is 1.5～2s.
CN201610165009.7A 2016-03-21 2016-03-21 Method of using desulfurizing and denitrifying agent to purify flue gas Pending CN105727713A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111804339A (en) * 2020-07-13 2020-10-23 宁夏乐天碳素有限公司 Production method of desulfurization and denitrification active coke catalyst
CN113731047A (en) * 2021-08-16 2021-12-03 中科三清科技有限公司 Flue gas desulfurization, denitrification and dust removal integrated device and treatment process thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1060613A (en) * 1990-09-14 1992-04-29 卡明斯发电有限公司 Be used for removing the method and apparatus of nitrogen oxide from air-flow
CN204637986U (en) * 2015-04-21 2015-09-16 南京朗洁环保科技有限公司 Free radical pre-oxidation is in conjunction with the simultaneous SO_2 and NO removal demercuration system of wet absorption

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1060613A (en) * 1990-09-14 1992-04-29 卡明斯发电有限公司 Be used for removing the method and apparatus of nitrogen oxide from air-flow
CN204637986U (en) * 2015-04-21 2015-09-16 南京朗洁环保科技有限公司 Free radical pre-oxidation is in conjunction with the simultaneous SO_2 and NO removal demercuration system of wet absorption

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111804339A (en) * 2020-07-13 2020-10-23 宁夏乐天碳素有限公司 Production method of desulfurization and denitrification active coke catalyst
CN113731047A (en) * 2021-08-16 2021-12-03 中科三清科技有限公司 Flue gas desulfurization, denitrification and dust removal integrated device and treatment process thereof

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Application publication date: 20160706