CN103691271B - A kind of flue gas gas phase desulfurization denitration method simultaneously - Google Patents
A kind of flue gas gas phase desulfurization denitration method simultaneously Download PDFInfo
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- CN103691271B CN103691271B CN201310694207.9A CN201310694207A CN103691271B CN 103691271 B CN103691271 B CN 103691271B CN 201310694207 A CN201310694207 A CN 201310694207A CN 103691271 B CN103691271 B CN 103691271B
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- flue gas
- desulfurization
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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
Abstract
The present invention relates to a kind of flue gas gas phase desulfurization denitration method simultaneously, the method injects desulfurization and denitrification reaction region by after compound desulfurization denitrification agent heating and gasifying, at a certain temperature with NOx, the SO in flue gas
2abundant hybrid reaction, reach the object of simultaneous SO_2 and NO removal, desulfuration efficiency reaches more than 95%, and denitration efficiency reaches more than 75%.The method is without the need to catalyst, desulfurization denitrification agent consumption is few, operation is simple, operating cost is lower than existing desulfurization denitration method, economic advantages are obvious, overcome that the investment of existing simultaneous SO_2 and NO removal technological infrastructure is high, operation and maintenance cost is high, operation is complicated problem, be applicable to multiple Industrial Boiler, the flue gas of Industrial Stoves or vent gas treatment.
Description
Technical field
The present invention relates to the method for a kind of flue gas simultaneously gas phase desulphurization denitration, particularly a kind of method utilizing compound desulfurization denitrification agent to carry out flue gas gas phase desulphurization denitration, belongs to gas cleaning processing technology field.
Technical background
Along with China's expanding economy, it is also more and more serious that mass energy consumes the environmental pollution brought.China take coal as the country of main energy sources, and the harmful substance such as flue dust, sulfur dioxide, nitrogen oxide contained in coal-fired flue-gas causes severe contamination to air.
Coal-fired Power Plant in China desulfur technology is of a great variety, as lime stone-gypsum, simply wet constructed, wet-type ammonia, electronic beam method etc.What denitrating flue gas application was maximum is SCR technology (SCR) and SNCR technology (SNCR), and the denitration reaction temperature of SCR technology is generally at 280 DEG C ~ 400 DEG C, and denitration efficiency reaches more than 90%; The reaction temperature of SNCR technology is generally at 850 ~ 1100 DEG C, and denitration efficiency is medium, generally about 50%.
At present, the desulfurization and denitrification integral technology of employing is the associating of desulphurization and denitration two kinds of modes mostly, i.e. SO
2to process respectively with NOx.There is various problems in existing desulphurization and denitration technology, the fixed investment as lime stone-gypsum is large, desulphurization cost is high, and a large amount of gypsum of generation are difficult to process etc.; There is the problems such as catalyst investment is large, smoke components impact is large, operating cost is high in SCR technology, SNCR technology exists that reaction temperature is high, reducing agent and the series of problems such as flue gas mixability is poor, denitration efficiency is low, ammonia escaped quantity is large.Therefore, there is the problems such as fixed investment is high, operation and maintenance cost is high, operation is complicated in the desulphurization denitration technology of associating.
Based on this, develop a kind of easy to operate, operating cost is low, the technology that utilizes a set of equipment can reach simultaneous SO_2 and NO removal object is filed of flue gas purification research focus.
Summary of the invention
The present invention is directed to the deficiency of existing desulphurization denitration technology, the method for a kind of flue gas simultaneously gas phase desulphurization denitration is provided, realizes SO in coal-fired flue-gas
2process with while NOx, with the problem that overcomes that the investment in fixed assets that existing desulphurization denitration technology exists is high, operation and maintenance cost is high, operation is complicated etc.
Summary of the invention
The invention provides a kind of flue gas gas phase desulfurization denitration method simultaneously, the method is that a kind of compound desulfurization denitrification agent is injected conversion zone, at a certain temperature with NOx and SO in flue gas
2abundant hybrid reaction, reaches the object of simultaneous SO_2 and NO removal.The method desulfurization denitrification agent consumption is few, and desulfuration efficiency is up to more than 95%, and denitration efficiency reaches more than 75%, and investment and operating cost are lower than existing desulfurization denitration method, and economic advantages are obvious.
Detailed Description Of The Invention
A kind of flue gas gas phase desulfurization denitration method simultaneously, comprises the steps:
(1) compound desulfurization denitrification agent is directly injected in reaction zone;
Or, by compound desulfurization denitrification agent heating and gasifying under 280 ~ 800 DEG C of conditions, inject in reaction zone after obtained gasificating desulfurization denitrfying agent;
Described compound desulfurization denitrification agent be selected from one of component A, B component, component C or the two above arbitrarily than combination:
Component A be selected from ammonium acetate, ammonium citrate, ammonium chloride one or both of above arbitrarily than combination;
B component be selected from urea, biuret, cyanuric acid, melamine one or both of above arbitrarily than combination;
Component C be selected from urea formaldehyde condensates, urea condensation of acetone thing one or both of arbitrarily than combination;
(2) compound desulfurization denitrification agent in step (1) or gasificating desulfurization denitrfying agent implantation temperature are the reaction zone of 500 ~ 1100 DEG C, mix with pending flue gas, reaction 1 ~ 5s;
SO in described compound desulfurization denitrification agent or gasificating desulfurization denitrfying agent and pending flue gas
2the mol ratio of reacting dose is (0.1 ~ 1.2): 1, NO in compound desulfurization denitrification agent or gasificating desulfurization denitrfying agent and pending flue gas
xthe mol ratio of reacting dose is (0.1 ~ 1.5): 1, compound desulfurization denitrification agent or the total operating weight of gasificating desulfurization denitrfying agent be respectively with SO in flue gas
2and NO
xreacting dose sum.
Preferred according to the present invention, in described step (1), heating and gasifying temperature is 300 ~ 600 DEG C.
Preferred according to the present invention, in described step (1), compound desulfurization denitrification agent is pressed powder, and particle diameter is 50 ~ 300 orders; Preferably, the particle diameter of described compound desulfurization denitrification agent is 120 ~ 200 orders.
Preferred according to the present invention, the carrier gas of injecting reaction zone in described step (1) is the pending flue gas of 100 ~ 500 DEG C or the air of normal temperature; Preferred further, described carrier gas is the pending flue gas of 200 ~ 500 DEG C.
Preferred according to the present invention, the injection pressure of described compound desulfurization denitrification agent is 0 ~ 100kpa.The quality of the desulfurization denitrification agent of injection pressure numerical value and conveying has direct relation, and this pressure is beneficial to after desulfurization denitrification agent enters reaction zone and fully mixes with pending flue gas.
Preferred according to the present invention, in described step (2), pending flue gas is the flue gas through dust removal process.Preferred further, described dust removal process is cyclone dust removal or bag-type dust.
Preferred according to the present invention, the reaction zone temperature in described step (2) is 650 ~ 1000 DEG C.Too high or too low for temperaturely all can cause the loss of reactant and the decline of removal efficiency.
Preferred according to the present invention, SO in compound desulfurization denitrification agent or gasificating desulfurization denitrfying agent and pending flue gas in described step (2)
2the mol ratio of reacting dose is (0.5 ~ 1): 1, NO in compound desulfurization denitrification agent or gasificating desulfurization denitrfying agent and pending flue gas
xthe mol ratio of reacting dose is (0.6 ~ 1.5): 1.
Preferred according to the present invention, in described step (2), the reaction time is 1.5 ~ 5s.
Beneficial effect of the present invention
1, the present invention is compared with prior art, have investment and operating cost is low, technological process is simple, floor space is little, easy to operate, desulfuration efficiency reaches more than 95%, and denitration efficiency reaches more than 75%; Also can with other method of denitration conbined usage, meet different disposal demand;
2, a kind of compound desulfurization denitrification agent of the present invention and SO
2, NO
xreaction can without catalyst, save denitrating system investment and operating cost, overcome the shortcoming that in SCR technology, catalyst investment is large, smoke components impact is large, operating cost is high;
3, the while of of the present invention, gas phase desulphurization denitration technology only once need inject wherein a kind of compound desulfurization denitrification agent of the present invention, can realize flue gas and desulfurizing and denitrifying, be applicable to flue gas or the vent gas treatment of station boiler and multiple Industrial Boiler and Industrial Stoves.
Detailed description of the invention
Below in conjunction with embodiment, technical scheme of the present invention is described further, but institute of the present invention protection domain is not limited thereto.
Pending flue gas described in embodiment is coal steam-electric plant smoke, NO
xbe about 600mg/m
3, SO
2be about 3000mg/m
3; NO in coal steam-electric plant smoke
xmain component is NO, accounts for NO
xmore than 95%, all the other are NO
2.
Embodiment 1
A kind of flue gas gas phase desulfurization denitration method simultaneously, comprises the steps:
(1) utilize air to do carrier gas, the desulfurization denitrification agent of the mixture of urea 805.5kg and ammonium chloride 78.5kg and a kind of compound is injected reaction zone, the SO in desulfurization denitrification agent and flue gas
2mol ratio is 0.9:1, with the NO in flue gas
xmol ratio is 1:1, and total use amount is both sums, and injection pressure is 35kpa;
(2) be under the condition of 850 DEG C at reaction zone temperature, after reaction 2s;
SO in flue gas before and after flue gas analyzer check processing
2, NO
xconcentration, calculates SO
2removal efficiency reaches 96.0%, NO
xremoval efficiency reach 75.7%.
Embodiment 2
Flue gas as described in Example 1 is gas phase desulfurization denitration method simultaneously, and difference is: be 950 DEG C at reaction zone temperature, and the reaction time is 2s.
SO in flue gas before and after flue gas analyzer check processing
2, NO
xconcentration, calculates SO
2removal efficiency reaches 98.0%, NO
xremoval efficiency reach 81.5%.
Embodiment 3
Flue gas as described in Example 1 is gas phase desulfurization denitration method simultaneously, and difference is: first added in heater by the desulfurization denitrification agent of compound, and temperature controls at 480 DEG C ~ 500 DEG C heating and gasifyings, obtained gasificating desulfurization denitrfying agent; Utilize temperature to be that the pending flue gas of 500 DEG C does carrier gas, inject reaction zone, reaction zone temperature is 850 DEG C, and the reaction time is 2s.
SO in flue gas before and after flue gas analyzer check processing
2, NO
xconcentration, calculates SO
2removal efficiency reaches 97.0%, NO
xremoval efficiency reach 80.5%.
Embodiment 4
Pending flue gas is with embodiment 1.
A kind of flue gas gas phase desulfurization denitration method simultaneously, comprises the steps:
(1) utilize air to do carrier gas, the mixture of urea 805.5kg and ammonium citrate 100kg is injected reaction zone as a kind of compound desulfurization denitrification agent, the SO in desulfurization denitrification agent and pending flue gas
2the mol ratio of reacting dose be 0.9:1, with in pending flue gas and NO
xmol ratio be 1:1, injection pressure 38kpa;
(2) be under the condition of 850 DEG C at reaction zone temperature, after reaction 2s;
SO in flue gas before and after flue gas analyzer check processing
2, NO
xconcentration, calculates SO
2removal efficiency reaches 95.8%, NO
xremoval efficiency reach 75.5%.
Embodiment 5
Pending flue gas is with embodiment 1.
A kind of flue gas gas phase desulfurization denitration method simultaneously, comprises the steps:
(1) utilize temperature to be that the pending flue gas of 500 DEG C does carrier gas, cyanuric acid 680kg is injected reaction zone, the SO in desulfurization denitrification agent and pending flue gas
2the mol ratio of reacting dose be 0.8:1, with in pending flue gas and NO
xthe mol ratio of reacting dose be 1:1, injection pressure 25kpa;
(2) be under the condition of 850 DEG C at reaction zone temperature, after reaction 2s;
SO in flue gas before and after flue gas analyzer check processing
2, NO
xconcentration, calculates SO
2removal efficiency reaches 97.7%, NO
xremoval efficiency reach 79%.
Embodiment 6
Pending flue gas is with embodiment 1.
A kind of flue gas gas phase simultaneous SO_2 and NO removal method, comprises the steps:
(1) utilize temperature to be that the pending flue gas of 450 DEG C does carrier gas, the mixture of a kind of desulfurization denitrification agent cyanuric acid 580kg and ammonium acetate 50kg is directly injected reaction zone, the SO in desulfurization denitrification agent and pending flue gas
2the mol ratio of reacting dose be 0.9:1, with the NO in pending flue gas
xthe mol ratio of reacting dose be 0.8:1, injection pressure 28kpa;
(2) be under the condition of 850 DEG C at reaction zone temperature, after reaction 3s;
SO in flue gas before and after flue gas analyzer check processing
2, NO
xconcentration, calculates SO
2removal efficiency reaches 96.7%, NO
xremoval efficiency reach 83.5%.
Embodiment 7
Pending flue gas is with embodiment 1.
A kind of flue gas gas phase simultaneous SO_2 and NO removal method, comprises the steps:
(1) utilize temperature to be that the flue gas of 300 DEG C does carrier gas, the mixture of a kind of desulfurization denitrification agent biuret 600kg and ammonium chloride 88.5kg is injected reaction zone, the SO in desulfurization denitrification agent and pending flue gas
2the mol ratio of reacting dose be 0.9:1, with in pending flue gas and NO
xthe mol ratio of reacting dose be 0.8:1, injection pressure 30kpa;
(2) be under the condition of 850 DEG C at reaction zone temperature, after reaction 1s;
SO in flue gas before and after flue gas analyzer check processing
2, NO
xconcentration, calculates SO
2removal efficiency reaches 96.3%, NO
xremoval efficiency reach 83.5%.
Embodiment 8
Pending flue gas is with embodiment 1.
A kind of flue gas gas phase simultaneous SO_2 and NO removal method, comprises the steps:
(1) utilize air to do carrier gas, desulfurization denitrification agent urea condensation of acetone thing 750kg is injected reaction zone, the SO in desulfurization denitrification agent and pending flue gas
2the mol ratio of reacting dose be 0.9:1, with in pending flue gas and NO
xthe mol ratio of reacting dose be 1.1:1, injection pressure 35kpa;
(2) be under the condition of 850 DEG C at reaction zone temperature, after reaction 5s;
SO in flue gas before and after flue gas analyzer check processing
2, NO
xconcentration, calculates SO
2removal efficiency reaches 94.8%, NO
xremoval efficiency reach 85.8%.
Claims (13)
1. a flue gas gas phase desulfurization denitration method simultaneously, is characterized in that, comprise the steps:
(1) compound desulfurization denitrification agent is directly injected in reaction zone;
Or, by compound desulfurization denitrification agent heating and gasifying under 280 ~ 800 DEG C of conditions, inject in reaction zone after obtained gasificating desulfurization denitrfying agent;
Described compound desulfurization denitrification agent be selected from biuret, cyanuric acid, melamine one or both of above arbitrarily than combination;
(2) compound desulfurization denitrification agent in step (1) or gasificating desulfurization denitrfying agent implantation temperature are the reaction zone of 500 ~ 1100 DEG C, mix with pending flue gas, reaction 1 ~ 5s;
SO in described compound desulfurization denitrification agent or gasificating desulfurization denitrfying agent and pending flue gas
2the mol ratio of reacting dose is (0.1 ~ 1.2): 1, NO in compound desulfurization denitrification agent or gasificating desulfurization denitrfying agent and pending flue gas
xthe mol ratio of reacting dose is (0.1 ~ 1.5): 1, compound desulfurization denitrification agent or the total operating weight of gasificating desulfurization denitrfying agent be respectively with SO in flue gas
2and NO
xreacting dose sum.
2. the method for claim 1, is characterized in that, in described step (1), compound desulfurization denitrification agent is pressed powder, and particle diameter is 50 ~ 300 orders.
3. method as claimed in claim 2, is characterized in that, in described step (1), compound desulfurization denitrification agent is pressed powder, and particle diameter is 50 ~ 100 orders.
4. method as claimed in claim 3, it is characterized in that, the particle diameter of described compound desulfurization denitrification agent is 120 ~ 200 orders.
5. the method for claim 1, is characterized in that, in described step (1), heating and gasifying temperature is 300 ~ 600 DEG C.
6. the method for claim 1, is characterized in that, the carrier injecting reaction zone in described step (1) is the pending flue gas of 100 ~ 500 DEG C or the air of normal temperature.
7. method as claimed in claim 6, is characterized in that, the carrier injecting reaction zone in described step (1) is the pending flue gas of 200 ~ 500 DEG C.
8. the method for claim 1, is characterized in that, the injection pressure of described compound desulfurization denitrification agent is 0 ~ 65kpa.
9. the method for claim 1, is characterized in that, in described step (2), pending flue gas is the flue gas through dust removal process.
10. method as claimed in claim 9, it is characterized in that, described dust removal process is cyclone dust removal or bag-type dust.
11. the method for claim 1, is characterized in that, the reaction zone temperature in described step (2) is 650 ~ 1000 DEG C.
12. the method for claim 1, is characterized in that, SO in compound desulfurization denitrification agent or gasificating desulfurization denitrfying agent and pending flue gas in described step (2)
2the mol ratio of reacting dose is (0.5 ~ 1): 1, NO in compound desulfurization denitrification agent or gasificating desulfurization denitrfying agent and pending flue gas
xthe mol ratio of reacting dose is (0.6 ~ 1.5): 1.
13. the method for claim 1, is characterized in that, in described step (2), the reaction time is 1.5 ~ 5s.
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Cited By (1)
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|---|---|---|---|---|
| CN109647175A (en) * | 2019-01-18 | 2019-04-19 | 山东大明消毒科技有限公司 | A kind of cyanuric acid denitrfying agent and its preparation method and application |
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| CN104014232A (en) * | 2014-06-24 | 2014-09-03 | 山东大学 | Method for performing smoke desulfurization and denitrification by using urea co-production preparation technology |
| CN104383808A (en) * | 2014-12-03 | 2015-03-04 | 天津天和环能科技有限公司 | Process and device for carrying out flue gas denitrification by utilizing solid organic denitrifying agent |
| CN104874270B (en) * | 2015-05-05 | 2017-04-19 | 北京环科腾越环保工程有限公司 | Method and system for denitration by adopting isocyanic acid gas |
| CN105688627A (en) * | 2016-03-21 | 2016-06-22 | 孙若浩 | Desulfurating agent and method for purifying flue gas by using desulfurating agent |
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| CN106823721A (en) * | 2017-02-23 | 2017-06-13 | 中国石油大学(北京) | A kind of flue gas desulfurization and denitrification agent and its preparation method and application |
| CN109499332A (en) * | 2018-12-05 | 2019-03-22 | 萍乡市华星环保工程技术有限公司 | Industrial smoke dry type high efficiency desulfurization denitration method |
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| CN110624380B (en) * | 2019-09-30 | 2022-02-18 | 江苏海默环保科技有限公司 | Synergistic desulfurization and denitrification agent and preparation and application thereof |
| CN111701432B (en) * | 2020-05-06 | 2022-12-23 | 佛山市吉力达铝材科技有限公司 | Denitration desulfurizer and preparation method thereof |
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