CN106582226B - It is a kind of using ammonia-contaminated gas as the Denitration in Boiler technique of denitrfying agent - Google Patents
It is a kind of using ammonia-contaminated gas as the Denitration in Boiler technique of denitrfying agent Download PDFInfo
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- CN106582226B CN106582226B CN201710025244.9A CN201710025244A CN106582226B CN 106582226 B CN106582226 B CN 106582226B CN 201710025244 A CN201710025244 A CN 201710025244A CN 106582226 B CN106582226 B CN 106582226B
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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
- B01D53/76—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
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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Abstract
The present invention relates to a kind of using ammonia-contaminated gas as the Denitration in Boiler technique of denitrfying agent, step are as follows: thick process gas is generated by gasification furnace, thick process gas enters carbon and washes tower, enter change furnace after carbon washes tower, enter ammonia stripping tower using heat-exchange system, water containing ammonia stripping is formed in ammonia stripping tower, water containing ammonia stripping enters stripper, ammonia-contaminated gas is formed after stripper stripping, ammonia-contaminated gas enters exhaust mixer, enter boiler by boiler supply air system after mixing with boiler secondary air, carry out denitration reaction, the exhaust gas after Denitration in Boiler is discharged by air-introduced machine by chimney.The present invention is carried out resource utilization, is reduced pollution from exhaust emission, significantly reduce denitrating flue gas cost using ammonia-contaminated gas as denitrfying agent；In denitrification process, compared with traditional SNCR denitration, reduces the latent heat of vaporization consumption of liquid water vapor, reduce heat waste；By denitrating technique of the present invention, so that discharged nitrous oxides concentration is less than 100mg/m3。
Description
Technical field
The present invention relates to a kind of using ammonia-contaminated gas as the Denitration in Boiler technique of denitrfying agent, belongs to denitration of boiler smoke technology neck
Domain.
Background technique
In Chemical Manufacture, conventional utility boiler produces vapor.In boiler combustion process, coal is reacted with oxygen generates titanium dioxide
Carbon releases heat.In combustion, because also containing element sulphur and nitrogen in coal, in addition to generating carbon dioxide, simultaneously also
Sulfur dioxide and NOx can be generated, because NOx is one of Air Pollutant Discharge, so needing to take off the NOx in boiler smoke
It removes.
Denitration of boiler smoke technology mainly selective catalytic reduction technique (SCR), selective non-catalytic reduction technology
(SNCR), hybrid SC R+SNCR technology etc., wherein traditional SNCR technology generally use the chemical reducing agents such as ammonium hydroxide, urea and
NOx reaction, by NOx conversion at nitrogen and water.Usual Chemical Manufacture enterprise needs the chemical reducing agents such as outsourcing ammonium hydroxide, urea as de-
Nitre agent simultaneously builds denitrification apparatus, removes to the NOx in boiler smoke, and the annual denitration process expense of such boiler will be very
It is high；And traditional denitration technology amount of ammonia slip is big, the problem of being easy to cause back-end ductwork to be blocked.
Gasification furnace can generate the thick process gas containing ammonia in Chemical Manufacture.Carbon monoxide, hydrogen, carbon dioxide in thick process gas
As effective process gas, transformed furnace reacts part carbon monoxide, carbon dioxide and hydrogen is converted to, through heat-exchange system
Process gas after cooling is stripped through the washing of ammonia stripping tower and stripper decompression, heating, obtains the ammonia-contaminated gas containing gaseous ammonia.It should
Contain a certain amount of ammonia in ammonia-contaminated gas, while also containing carbon dioxide, carbon monoxide, hydrogen, ammonia-contaminated gas direct emission
It will cause serious environmental pollution into air.
Summary of the invention
The ammonia-contaminated gas that gasification furnace generates can be used as Denitration in Boiler agent by the processing of special process by the present invention, significantly
The cost for reducing Denitration in Boiler reduces denitrification apparatus investment, while ammonia-contaminated gas can also be made to get utilization, and subtracts
Few environmental pollution, while it is big to can solve traditional denitration technology amount of ammonia slip, the problem of being easy to cause back-end ductwork to be blocked.This hair
Bright technical solution is as follows:
It is a kind of using ammonia-contaminated gas as the Denitration in Boiler technique of denitrfying agent, the specific steps are as follows:
(1) in gasification furnace, coal and water react in oxygen-enriched situation, generate based on process gas simultaneously the ammonia of object containing side reaction
The thick process gas of gas, thick process gas enter carbon and wash tower, wash in carbon and remove solid particulate matter in tower；
(2) the thick process gas containing ammonia enters change furnace after carbon washes tower, in change furnace inner part carbon monoxide and vapor
It is converted to carbon dioxide and hydrogen under the effect of the catalyst, side reaction object ammonia is not involved in reaction；
(3) the thick process gas containing ammonia enters heat-exchange system after change furnace, cools down in heat-exchange system, thick process gas
Temperature drops to 40 DEG C from 430 DEG C, pressure 6.0MPa；
(4) the thick process gas containing ammonia after heat-exchange system enter ammonia stripping tower, the thick process gas containing ammonia in scrubbing tower with spray
Water drenching inversely contacts, and under the pressure of 6.0MPa, ammonia is dissolved in water, and forms water containing ammonia stripping, and water containing ammonia stripping enters vapour
Stripper；
(5) in stripper, pressure 0.2MPa, water containing ammonia stripping is sprayed into stripper upper end, and middle part adds steam, steam
It exchanges heat with the counter current contacting of water containing ammonia stripping, the ammonia stripping being dissolved in washing water becomes the ammonia-contaminated gas containing gaseous ammonia；
(6) ammonia-contaminated gas enters exhaust mixer after stripper, uniform with boiler secondary air in exhaust mixer
The volume ratio of mixing, ammonia-contaminated gas and Secondary Air is 7:5000-15000；
Preferably, the volume ratio of ammonia-contaminated gas and Secondary Air is 7:10000.
(7) it blows after being come out with the ammonia-contaminated gas of boiler secondary air after evenly mixing by exhaust mixer by boiler and is
System, enters boiler from the lower part of boiler with gaseous state, flue gas under the conditions of temperature is 850-1150 DEG C, in ammonia-contaminated gas and boiler
Come into full contact with, carry out denitration reaction, ammonia-contaminated gas in the boiler with the reduction reaction of NOx in flue gas such as formula (1) and formula (2):
4NO+4NH3+O2→4N2+6H2O (1)
2NO2+4NH3+O2→3N2+6H2O (2)
In addition, the reaction such as formula (3) and formula (4) also occurs in boiler for ammonia-contaminated gas:
2CO+O2→2CO2 (3)
2H2+O2→2H2O (4)；
(8) exhaust gas after Denitration in Boiler is discharged by air-introduced machine by chimney.
Preferably, in the step (5), ammonia-contaminated gas includes ammonia, carbon monoxide, carbon dioxide, hydrogen, methane, nitrogen
Gas, hydrogen sulfide and carbonyl sulfide.
In gasification furnace, when coal and water are reacted in oxygen-enriched situation, carbon monoxide, carbon dioxide, hydrogen are mainly generated,
Due to containing nitrogen in coal, while side reaction occurs and generates ammonia.Wherein carbon monoxide, hydrogen, carbon dioxide are as effective
The transformed furnace of process gas reacts part carbon monoxide, is converted to carbon dioxide and hydrogen, through heat-exchange system by process gas
Temperature is reduced to 40 DEG C from 430 DEG C, and the process gas after temperature reduces washes away the ammonia that side reaction generates through Ammonic washing tower, clean
The lower workshop section of technique pneumatic transmission, the washing water rich in ammonia is depressurized through stripper, heating strips, the ammonolysis being dissolved in washing water
Inhaling becomes the ammonia-contaminated gas containing gaseous ammonia, and in the ammonia-contaminated gas of generation, the content of ammonia reaches 20% or more.
Traditional denitration technology is only reaction zone in furnace outlet to superheater entrance, has little time the ammonia of reaction then
It escapes to rear workshop section.(3m is left to 850-1100 DEG C of furnace outlet (37m or so), furnace outlet to superheater entrance for burner hearth bottom
It is right) it is 850-950 DEG C, this two sections comfort zones for Denitration in Boiler, and this technology is because be in boiler bottom with gaseous state side
Ammonia-contaminated gas is added in formula, is reaction zone from burner hearth bottom to the process that the flue gas of superheater entrance 40m or so circulates, with tradition
SNCR technology be added with 5% or so ammonium hydroxide and be compared in boiler furnace outlet, increases the residence time of reactant, is increased
The time that reactant is reacted, improve reaction efficiency, because in the entire reaction process always in reaction temperature, and
Contain fuel gas in ammonia-contaminated gas, ensure that the reaction temperature in reaction process, because entire reaction temperature is protected, reacts
The object residence time is increased, and is sufficiently reacted between reactant, to reduce the reactant for having neither part nor lot in reaction, is reduced
Amount of ammonia slip.
The ammonia that traditional Denitration in Boiler is escaped is reacted after temperature reduction with the sulfur dioxide in flue gas, is generated
Ammonium sulfate, the biggish crystal of ammonium sulfite viscosity, crystal in conjunction with the Boiler Ash in flue gas, be bonded in air preheater and
On desulfurization and dedusting cloth bag, to generate dirty stifled.
Compared with the prior art, the present invention has the following advantages:
(1) present invention is carried out resource utilization, is reduced pollution from exhaust emission, significantly using ammonia-contaminated gas as denitrfying agent
Reduce denitrating flue gas cost.
(2) ammonia-contaminated gas is entered with gaseous state and carries out denitrating technique in boiler in the present invention, is added with traditional SNCR denitration
Ammonium hydroxide is compared, and is reduced the latent heat of vaporization consumption of liquid water vapor, is reduced heat waste.
(3) pass through denitrating technique of the present invention, so that discharged nitrous oxides concentration is less than 100mg/m3。
(4) present invention improves reaction efficiency compared with traditional denitration technology, increases reactant residence time, guarantees
Reaction temperature, reduces amount of ammonia slip, achieves good economic benefit and environmental benefit, at the same reduce back-end ductwork because
Crystal mixes with ash and a possibility that dirty stifled occurs.
Detailed description of the invention
Fig. 1 is process flow chart of the invention；
1. gasification furnace, 2. carbon wash tower, 3. change furnaces, 4. heat-exchange systems, 5. ammonia stripping towers, 6. strippers, the mixing of 7. exhaust gas
Device, 8. boiler supply air systems, 9. boilers, 10. air-introduced machines, 11. chimneys.
Specific embodiment
The invention will now be further described with reference to specific embodiments, the advantages and features of the present invention will be with description and
It is apparent.But examples are merely exemplary, and it is not intended to limit the scope of the present invention in any way.Those skilled in the art answer
It should be appreciated that without departing from the spirit and scope of the invention can details to technical solution of the present invention and form repair
Change or replace, but these modifications and replacement are fallen within the protection scope of the present invention.
Embodiment 1 is a kind of using ammonia-contaminated gas as the Denitration in Boiler technique of denitrfying agent
Specific step is as follows for technique:
(1) in gasification furnace, coal and water react in oxygen-enriched situation, generate based on process gas simultaneously the ammonia of object containing side reaction
The thick process gas of gas, thick process gas enter carbon and wash tower, wash in carbon and remove solid particulate matter in tower；
(2) the thick process gas containing ammonia enters change furnace after carbon washes tower, in change furnace inner part carbon monoxide and vapor
It is converted to carbon dioxide and hydrogen under the effect of the catalyst, side reaction object ammonia is not involved in reaction；
(3) the thick process gas containing ammonia enters heat-exchange system after change furnace, cools down in heat-exchange system, thick process gas
Temperature drops to 40 DEG C from 430 DEG C, pressure 6.0MPa；
(4) the thick process gas containing ammonia after heat-exchange system enter ammonia stripping tower, the thick process gas containing ammonia in scrubbing tower with spray
Water drenching inversely contacts, and under the pressure of 6.0MPa, ammonia is dissolved in water, and forms water containing ammonia stripping, and water containing ammonia stripping enters vapour
Stripper；
(5) in stripper, pressure 0.2MPa, water containing ammonia stripping is sprayed into stripper upper end, and bottom adds steam, steam
It exchanges heat with the counter current contacting of water containing ammonia stripping, the ammonia stripping being dissolved in washing water becomes the ammonia-contaminated gas containing gaseous ammonia；
(6) ammonia-contaminated gas enters exhaust mixer after stripper, uniform with boiler secondary air in exhaust mixer
The volume ratio of mixing, ammonia-contaminated gas and Secondary Air is 7:10000；
(7) it blows after being come out with the ammonia-contaminated gas of boiler secondary air after evenly mixing by exhaust mixer by boiler and is
System, enters boiler from the lower part of boiler with gaseous state, flue gas under the conditions of temperature is 850-1150 DEG C, in ammonia-contaminated gas and boiler
Come into full contact with, carry out denitration reaction, ammonia-contaminated gas in the boiler with the reduction reaction of NOx in flue gas such as formula (1) and formula (2):
4NO+4NH3+O2→4N2+6H2O (1)
2NO2+4NH3+O2→3N2+6H2O (2)
In addition, the reaction such as formula (3) and formula (4) also occurs in boiler for ammonia-contaminated gas:
2CO+O2→2CO2 (3)
2H2+O2→2H2O (4)；
(8) exhaust gas after Denitration in Boiler is discharged by air-introduced machine by chimney.
Through detecting, discharged nitrous oxides concentration is 61mg/m in the present embodiment3。
Embodiment 2 is a kind of using ammonia-contaminated gas as the Denitration in Boiler technique of denitrfying agent
Specific step is as follows for technique:
(1) in gasification furnace, coal and water react in oxygen-enriched situation, generate based on process gas simultaneously the ammonia of object containing side reaction
The thick process gas of gas, thick process gas enter carbon and wash tower, wash in carbon and remove solid particulate matter in tower；
(2) the thick process gas containing ammonia enters change furnace after carbon washes tower, in change furnace inner part carbon monoxide and vapor
It is converted to carbon dioxide and hydrogen under the effect of the catalyst, side reaction object ammonia is not involved in reaction；
(3) the thick process gas containing ammonia enters heat-exchange system after change furnace, cools down in heat-exchange system, thick process gas
Temperature drops to 40 DEG C from 430 DEG C, pressure 6.0MPa；
(4) the thick process gas containing ammonia after heat-exchange system enter ammonia stripping tower, the thick process gas containing ammonia in scrubbing tower with spray
Water drenching inversely contacts, and under the pressure of 6.0MPa, ammonia is dissolved in water, and forms water containing ammonia stripping, and water containing ammonia stripping enters vapour
Stripper；
(5) in stripper, pressure 0.2MPa, water containing ammonia stripping is sprayed into stripper upper end, and bottom adds steam, steam
It exchanges heat with the counter current contacting of water containing ammonia stripping, the ammonia stripping being dissolved in washing water becomes the ammonia-contaminated gas containing gaseous ammonia；Contain
Ammonia exhaust gas includes ammonia, carbon monoxide, carbon dioxide, hydrogen, methane, nitrogen, hydrogen sulfide and carbonyl sulfide；
(6) ammonia-contaminated gas enters exhaust mixer after stripper, uniform with boiler secondary air in exhaust mixer
The volume ratio of mixing, ammonia-contaminated gas and Secondary Air is 7:14000；
(7) it blows after being come out with the ammonia-contaminated gas of boiler secondary air after evenly mixing by exhaust mixer by boiler and is
System, enters boiler from the lower part of boiler with gaseous state, flue gas under the conditions of temperature is 850-1150 DEG C, in ammonia-contaminated gas and boiler
Come into full contact with, carry out denitration reaction, ammonia-contaminated gas in the boiler with the reduction reaction of NOx in flue gas such as formula (1) and formula (2):
4NO+4NH3+O2→4N2+6H2O (1)
2NO2+4NH3+O2→3N2+6H2O (2)
In addition, the reaction such as formula (3) and formula (4) also occurs in boiler for ammonia-contaminated gas:
2CO+O2→2CO2 (3)
2H2+O2→2H2O (4)；
(8) exhaust gas after Denitration in Boiler is discharged by air-introduced machine by chimney.
Through detecting, discharged nitrous oxides concentration is 65mg/m3 in the present embodiment.
Embodiment 3 is a kind of using ammonia-contaminated gas as the Denitration in Boiler system of denitrfying agent, as shown in Figure 1, system includes gasification furnace
1, carbon washes tower 2, change furnace 3, heat-exchange system 4, ammonia stripping tower 5, stripper 6, exhaust mixer 7, boiler supply air system 8, boiler
9, air-introduced machine 10 and chimney 11, gasification furnace 1 are connect by pipeline with the import that carbon washes tower 2, and the outlet that carbon washes tower 2 passes through pipeline
It is connect with the import of change furnace 3, the outlet of change furnace 3 is connect with the import of heat-exchange system 4, and outlet and the ammonia of heat-exchange system 4 are washed
The import connection of tower 5 is washed, ammonia stripping tower 5 is equipped with gas vent and liquid outlet, the liquid outlet and stripper 6 of ammonia stripping tower 5
Import connection, the outlet of stripper 6 connect with the import of exhaust mixer 7, the process boiler supply air system 8 of exhaust mixer 7
It is connect with the lower part of boiler 9, the outlet of boiler 9 is connect by air-introduced machine 10 with chimney 11.
Claims (3)
1. a kind of using ammonia-contaminated gas as the Denitration in Boiler technique of denitrfying agent, which is characterized in that specific step is as follows for technique:
(1) in gasification furnace, coal and water react in oxygen-enriched situation, generate based on process gas the ammonia of object containing side reaction simultaneously
Thick process gas, thick process gas enter carbon and wash tower, wash in carbon and remove solid particulate matter in tower；
(2) the thick process gas containing ammonia enters change furnace after carbon washes tower, is urging in change furnace inner part carbon monoxide and vapor
Carbon dioxide and hydrogen are converted under the action of agent, side reaction object ammonia is not involved in reaction；
(3) the thick process gas containing ammonia enters heat-exchange system after change furnace, cools down in heat-exchange system, unskilled workman's skill temperature degree
40 DEG C are dropped to from 430 DEG C, pressure 6.0MPa；
(4) the thick process gas containing ammonia enters ammonia stripping tower after heat-exchange system, and the thick process gas containing ammonia is in scrubbing tower and shower water
Reverse contact, under the pressure of 6.0MPa, ammonia is dissolved in water, and forms water containing ammonia stripping, and water containing ammonia stripping enters stripper；
(5) in stripper, pressure 0.2MPa, water containing ammonia stripping is sprayed into stripper upper end, and bottom adds steam, steam with contain
The heat exchange of ammonia stripping water counter current contacting, the ammonia stripping being dissolved in washing water become the ammonia-contaminated gas containing gaseous ammonia；
(6) ammonia-contaminated gas enters exhaust mixer after stripper, uniformly mixes in exhaust mixer with boiler secondary air,
The volume ratio of ammonia-contaminated gas and Secondary Air is 7:5000-15000；
(7) by boiler supply air system after being come out with the ammonia-contaminated gas of boiler secondary air after evenly mixing by exhaust mixer, with
Gaseous state enters boiler from lower portion thereof, and under the conditions of temperature is 850-1150 DEG C, ammonia-contaminated gas sufficiently connects with the flue gas in boiler
Touching, carry out denitration reaction, ammonia-contaminated gas in the boiler with the reduction reaction of NOx in flue gas such as formula (1) and formula (2):
4NO+4NH3+O2→4N2+6H2O(1)
2NO2+4NH3+O2→3N2+6H2O(2)
In addition, the reaction such as formula (3) and formula (4) also occurs in boiler for ammonia-contaminated gas:
2CO+O2→2CO2(3)
2H2+O2→2H2O(4)；
(8) exhaust gas after Denitration in Boiler is discharged by air-introduced machine by chimney.
2. according to claim 1 a kind of using ammonia-contaminated gas as the Denitration in Boiler technique of denitrfying agent, which is characterized in that described
Ammonia-contaminated gas includes ammonia, carbon monoxide, carbon dioxide, hydrogen, methane, nitrogen, hydrogen sulfide and carbonyl sulfide in step (5).
3. according to claim 1 a kind of using ammonia-contaminated gas as the Denitration in Boiler technique of denitrfying agent, which is characterized in that described
Ammonia-contaminated gas enters exhaust mixer after stripper in step (6), uniformly mixes in exhaust mixer with boiler secondary air
It closes, the volume ratio of ammonia-contaminated gas and Secondary Air is 7:10000.
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| CN108970353B (en) * | 2018-07-16 | 2021-04-30 | 西安华大骄阳绿色科技有限公司 | Comprehensive desulfurization and denitrification method for catalytic flue gas and ammonia-containing acid gas |
| CN108913215A (en) * | 2018-08-06 | 2018-11-30 | 唐山科源环保技术装备有限公司 | Remove ammonia and the technique for carrying out innocuously transformation processing in producer gas |
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| DE19600869A1 (en) * | 1996-01-12 | 1997-07-17 | Metallgesellschaft Ag | Process for the denitrification of smoke gases |
| CN101890279B (en) * | 2010-03-10 | 2013-03-13 | 张作保 | Efficient ammonia-process denitration process and device |
| US9289720B2 (en) * | 2012-05-31 | 2016-03-22 | Mitsubishi Hitachi Power Systems, Ltd. | System and method for treating mercury in flue gas |
| CN104028084B (en) * | 2014-03-29 | 2016-05-18 | 江苏永钢集团有限公司 | Carry out method and the equipment thereof of coal fired power generation denitrating flue gas based on remained ammonia |
| CN206986110U (en) * | 2017-01-13 | 2018-02-09 | 久泰能源内蒙古有限公司 | A kind of Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent |
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Address after: 010321 Dalu New District, Zhungeer banner, Ordos City, Inner Mongolia Autonomous Region Patentee after: Inner Mongolia Jiutai New Material Technology Co.,Ltd. Address before: 010319 Zhungeer Banner Road New District, Ordos City, Inner Mongolia Autonomous Region Patentee before: JIUTAI ENERGY INNER MONGOLIA Co.,Ltd. |
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