CN106582226A - Boiler denitration process taking ammonia-containing waste gas as denitration agent - Google Patents
Boiler denitration process taking ammonia-containing waste gas as denitration agent Download PDFInfo
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- CN106582226A CN106582226A CN201710025244.9A CN201710025244A CN106582226A CN 106582226 A CN106582226 A CN 106582226A CN 201710025244 A CN201710025244 A CN 201710025244A CN 106582226 A CN106582226 A CN 106582226A
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- ammonia
- boiler
- gas
- denitration
- tower
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 208
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 66
- 230000008569 process Effects 0.000 title claims abstract description 51
- 239000002912 waste gas Substances 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 108
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 30
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000006243 chemical reaction Methods 0.000 claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 238000002309 gasification Methods 0.000 claims abstract description 14
- 239000003546 flue gas Substances 0.000 claims abstract description 13
- 238000005406 washing Methods 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 34
- 230000008859 change Effects 0.000 claims description 23
- 230000008676 import Effects 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 17
- 239000001569 carbon dioxide Substances 0.000 claims description 17
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 17
- 239000001257 hydrogen Substances 0.000 claims description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims description 16
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 15
- JJWKPURADFRFRB-UHFFFAOYSA-N carbonyl sulfide Chemical compound O=C=S JJWKPURADFRFRB-UHFFFAOYSA-N 0.000 claims description 12
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 12
- 150000002431 hydrogen Chemical class 0.000 claims description 11
- 238000007086 side reaction Methods 0.000 claims description 10
- 239000003245 coal Substances 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 238000006722 reduction reaction Methods 0.000 claims description 5
- 206010047700 Vomiting Diseases 0.000 claims description 4
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 4
- 239000013618 particulate matter Substances 0.000 claims description 4
- 238000005201 scrubbing Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 230000008673 vomiting Effects 0.000 claims description 4
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000002156 mixing Methods 0.000 abstract description 5
- 238000010531 catalytic reduction reaction Methods 0.000 abstract description 2
- 238000009834 vaporization Methods 0.000 abstract description 2
- 230000008016 vaporization Effects 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 2
- 238000005516 engineering process Methods 0.000 description 12
- 239000000376 reactant Substances 0.000 description 5
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 235000013877 carbamide Nutrition 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 238000005915 ammonolysis reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
Landscapes
- 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)
- Chimneys And Flues (AREA)
Abstract
The invention relates to a boiler denitration process taking ammonia-containing waste gas as a denitration agent. The boiler denitration process includes the steps: generating raw process gas by a gasification furnace; enabling the raw process gas to enter a carbon washing tower and then enter a conversion furnace; enabling the raw process gas to enter an ammonia washing tower through a heat exchange system; forming ammonia-containing washing water in the ammonia washing tower; enabling the ammonia-containing washing water to enter a stripping tower; forming the ammonia-containing waste gas after stripping in the stripping tower; enabling the ammonia-containing waste gas to enter a waste gas mixer; mixing the ammonia-containing waste gas with secondary air of a boiler; enabling the mixed gas to enter the boiler through a boiler air supply system to perform denitration reaction; exhausting the denitrified boiler waste gas from a chimney through an induced draft fan. The ammonia-containing waste gas serves as the denitration agent, resources are utilized, waste gas emission pollution is decreased, and flue gas denitration cost is remarkably reduced. In the denitration process, compared with traditional SNCR (selective non-catalytic reduction) denitration, the denitration process has the advantages that liquid water vaporization latent heat consumption and heat waste are decreased, and nitric oxide emission concentration is lower than 100mg/m<3>.
Description
Technical field
The present invention relates to a kind of Denitration in Boiler technique with ammonia-contaminated gas as denitrfying agent, belongs to denitration of boiler smoke technology neck
Domain.
Background technology
In Chemical Manufacture, conventional utility boiler produces vapor.In boiler combustion process, coal produces titanium dioxide with oxygen reaction
Carbon, releases heat.In combustion, because also containing element sulphur and nitrogen in coal, except producing carbon dioxide, while also
Sulfur dioxide and NOx can be produced, because NOx is one of Air Pollutant Discharge, so needing to take off the NOx in boiler smoke
Remove.
Denitration of boiler smoke technology main selective catalytic reduction technique (SCR), SNCR technology
(SNCR), hybrid SC R+SNCR technology etc., wherein traditional SNCR technologies typically using the chemical reducing agent such as ammonia, carbamide and
NOx reacts, by NOx conversion into nitrogen and water.Generally Chemical Manufacture enterprise needs the chemical reducing agents such as outsourcing ammonia, carbamide as de-
Nitre agent simultaneously builds denitrification apparatus, and the NOx in boiler smoke is removed, and the annual denitration process expense of such boiler will be very
It is high；And traditional denitration technology amount of ammonia slip is greatly, is easily caused the problem that back-end ductwork is blocked.
Gasification furnace can produce the thick process gas containing ammonia in Chemical Manufacture.Carbon monoxide, hydrogen, carbon dioxide in thick process gas
Used as effective process gas, transformed stove is reacted part carbon monoxide, changes into carbon dioxide and hydrogen, Jing heat-exchange systems
The washing of process gas Jing ammonia stripping tower and stripper after cooling is reduced pressure, adds thermal stripping, obtains the ammonia-contaminated gas containing gaseous ammonia.Should
Contain a certain amount of ammonia in ammonia-contaminated gas, while also containing carbon dioxide, carbon monoxide, hydrogen, ammonia-contaminated gas are directly discharged
Serious environmental pollution can be caused into air.
The content of the invention
The ammonia-contaminated gas that gasification furnace is produced can be used as Denitration in Boiler agent by the present invention through the process of special process, significantly
The cost of Denitration in Boiler is reduced, denitrification apparatus investment is reduced, while ammonia-contaminated gas can also be made to get utilization, is subtracted
Few environmental pollution, while traditional denitration technology amount of ammonia slip can be solved greatly, is easily caused the problem that back-end ductwork is blocked.This
Bright technical scheme is as follows：
A kind of Denitration in Boiler technique with ammonia-contaminated gas as denitrfying agent, comprises the following steps that：
(1) in gasification furnace, coal and water react in the case of oxygen-enriched, produce based on process gas while the ammonia of thing containing side reaction
The thick process gas of gas, thick process gas wash tower into carbon, wash in tower in carbon and remove solid particulate matter；
(2) the thick process gas containing ammonia enter change furnace after carbon washes tower, in change furnace interior part carbon monoxide and vapor
Carbon dioxide and hydrogen are changed in the presence of catalyst, side reaction thing ammonia is not involved in reaction；
(3) the thick process gas containing ammonia enter heat-exchange system after change furnace, are lowered the temperature in heat-exchange system, thick process gas
Temperature drops to 40 DEG C from 430 DEG C, and pressure is 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 is inversely contacted, 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 is 0.2MPa, and water containing ammonia stripping is sprayed in stripper upper end, and middle part adds steam, steam
With the stream contact heat-exchanging of watery vomiting containing ammonia stripping, the ammonia being dissolved in washings is stripped becomes the ammonia-contaminated gas containing gaseous ammonia；
(6) ammonia-contaminated gas enter exhaust mixer after stripper, uniform with boiler secondary air in exhaust mixer
Mixing, ammonia-contaminated gas are 7 with the volume ratio of secondary wind:5000-15000；
Preferably, ammonia-contaminated gas and the volume ratio of secondary wind are 7:10000.
(7) out blown through boiler afterwards by exhaust mixer with the uniform mixed ammonia-contaminated gas of boiler secondary air and be
System, boiler is entered with gaseous state from the bottom of boiler, under the conditions of temperature is for 850-1150 DEG C, the flue gas in ammonia-contaminated gas and boiler
Be fully contacted, carry out denitration reaction, ammonia-contaminated gas in the boiler with the reduction reaction such as formula (1) and formula (2) of NOx in flue gas:
4NO+4NH3+O2→4N2+6H2O(1)
2NO2+4NH3+O2→3N2+6H2O(2)
Additionally, also there is the reaction such as formula (3) and formula (4) such as in boiler in ammonia-contaminated gas：
2CO+O2→2CO2(3)
2H2+O2→2H2O(4)；
(8) waste gas after Denitration in Boiler is discharged through air-introduced machine by chimney.
Preferably, in the step (5), ammonia-contaminated gas include ammonia, carbon monoxide, carbon dioxide, hydrogen, methane, nitrogen
Gas, hydrogen sulfide and carbonyl sulfide, temperature be 75 DEG C, pressure be 0.25MPa under the conditions of, ammonia, carbon monoxide, carbon dioxide,
Hydrogen, methane, nitrogen, hydrogen sulfide and carbonyl sulfide account for the volume fraction of ammonia-contaminated gas be respectively 20.35%, 13.82%,
51.36%th, 13.58%, 0.04%, 0.13%, 0.01%, 0.67% and 0.01%.
In gasification furnace, coal and water produce carbon monoxide, carbon dioxide, hydrogen when being reacted in the case of oxygen-enriched, mainly,
Due to containing nitrogen in coal, while side reaction occurs produces ammonia.Wherein carbon monoxide, hydrogen, carbon dioxide are used as effective
The transformed stove of process gas is reacted part carbon monoxide, changes into carbon dioxide and hydrogen, and Jing heat-exchange systems are by process gas
Temperature is reduced to 40 DEG C from 430 DEG C, and the process gas Jing Ammonic washing tower after temperature is reduced washes away the ammonia that side reaction is produced, clean
The next workshop section of technique pneumatic transmission, the washings Jing strippers rich in ammonia are reduced pressure, add thermal stripping, the ammonolysis being dissolved in washings
Suction becomes the ammonia-contaminated gas containing gaseous ammonia, and in the ammonia-contaminated gas of generation, the content of ammonia reaches more than 20%.
Traditional denitration technology is simply reaction zone in furnace outlet to superheater entrance, has little time the ammonia for reacting then
Escape to rear workshop section.Burner hearth bottom is to 850-1100 DEG C of furnace outlet (37m or so), (3m is left for furnace outlet to superheater entrance
It is right) it is 850-950 DEG C, this two sections comfort zones for Denitration in Boiler, and this technology is because be with gaseous state side in boiler bottom
Formula adds ammonia-contaminated gas, and the process from burner hearth bottom to the circulation of the flue gas of superheater entrance 40m or so is reaction zone, with tradition
SNCR technologies carry out addition and compare in boiler furnace outlet with 5% or so ammonia, increased the time of staying of reactant, increase
The time that reactant is reacted, improve reaction efficiency, because in the whole course of reaction all the time in reaction temperature, and
Contain fuel gas in ammonia-contaminated gas, it is ensured that the reaction temperature in course of reaction, because whole reaction temperature is protected, reacts
The thing time of staying is increased, and is fully reacted between reactant, so as 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
The larger crystal of ammonium sulfate, ammonium sulfite viscosity, crystal is combined with the Boiler Ash in flue gas, be bonded in air preheater and
It is dirty stifled so as to produce on desulfurization and dedusting cloth bag.
Present invention additionally comprises a kind of Denitration in Boiler system with ammonia-contaminated gas as denitrfying agent, system includes that gasification furnace, carbon are washed
Tower, change furnace, heat-exchange system, ammonia stripping tower, stripper, exhaust mixer, boiler supply air system, boiler, air-introduced machine and chimney,
Gasification furnace is connected by the import that pipeline and carbon wash tower, and carbon is washed the outlet of tower and is connected with the import of change furnace by pipeline, conversion
The outlet of stove is connected with the import of heat-exchange system, and the outlet of heat-exchange system is connected with the import of ammonia stripping tower, and ammonia stripping tower is provided with
Gas outlet and liquid outlet, the liquid outlet of ammonia stripping tower is connected with the import of stripper, and outlet and the waste gas of stripper are mixed
The import connection of clutch, exhaust mixer is connected through boiler supply air system with the bottom of boiler, and the outlet of boiler is through air inducing
Machine is connected with chimney.
The present invention has compared with prior art advantages below：
(1) present invention carries out recycling using ammonia-contaminated gas as denitrfying agent, reduces pollution from exhaust emission, significantly
Reduce denitrating flue gas cost.
(2) ammonia-contaminated gas carry out denitrating technique in boiler with gaseous state in the present invention, add with traditional SNCR denitration
Ammonia is compared, and reduces the latent heat of vaporization consumption of liquid water vapor, reduces heat waste.
(3) denitrating technique of the present invention is passed through so that discharged nitrous oxides concentration is less than 100mg/m3。
(4) it is of the invention to improve reaction efficiency compared with traditional denitration technology, increased reactant residence time, it is ensured that
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 dirty stifled probability occurs.
Description of the drawings
Fig. 1 is present invention process flow chart；
1. gasification furnace, 2. carbon wash tower, 3. change furnace, 4. heat-exchange system, 5. ammonia stripping tower, 6. stripper, 7. waste gas mixing
Device, 8. boiler supply air system, 9. boiler, 10. air-introduced machine, 11. chimneys.
Specific embodiment
Further describe the present invention with reference to specific embodiment, advantages of the present invention and feature will be with description and
It is apparent.But embodiment is only exemplary, does not constitute any restriction to the scope of the present invention.Those skilled in the art should
It should be appreciated that, the details of technical solution of the present invention and form can be repaiied without departing from the spirit and scope of the invention
Change or replace, but these modifications and replacement are each fallen within protection scope of the present invention.
A kind of Denitration in Boiler technique with ammonia-contaminated gas as denitrfying agent of embodiment 1
Technique is comprised the following steps that：
(1) in gasification furnace, coal and water react in the case of oxygen-enriched, produce based on process gas while the ammonia of thing containing side reaction
The thick process gas of gas, thick process gas wash tower into carbon, wash in tower in carbon and remove solid particulate matter；
(2) the thick process gas containing ammonia enter change furnace after carbon washes tower, in change furnace interior part carbon monoxide and vapor
Carbon dioxide and hydrogen are changed in the presence of catalyst, side reaction thing ammonia is not involved in reaction；
(3) the thick process gas containing ammonia enter heat-exchange system after change furnace, are lowered the temperature in heat-exchange system, thick process gas
Temperature drops to 40 DEG C from 430 DEG C, and pressure is 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 is inversely contacted, 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 is 0.2MPa, and water containing ammonia stripping is sprayed in stripper upper end, and bottom adds steam, steam
With the stream contact heat-exchanging of watery vomiting containing ammonia stripping, the ammonia being dissolved in washings is stripped becomes the ammonia-contaminated gas containing gaseous ammonia；
(6) ammonia-contaminated gas enter exhaust mixer after stripper, uniform with boiler secondary air in exhaust mixer
Mixing, ammonia-contaminated gas are 7 with the volume ratio of secondary wind:10000；
(7) out blown through boiler afterwards by exhaust mixer with the uniform mixed ammonia-contaminated gas of boiler secondary air and be
System, boiler is entered with gaseous state from the bottom of boiler, under the conditions of temperature is for 850-1150 DEG C, the flue gas in ammonia-contaminated gas and boiler
Be fully contacted, carry out denitration reaction, ammonia-contaminated gas in the boiler with the reduction reaction such as formula (1) and formula (2) of NOx in flue gas：
4NO+4NH3+O2→4N2+6H2O(1)
2NO2+4NH3+O2→3N2+6H2O(2)
Additionally, also there is the reaction such as formula (3) and formula (4) such as in boiler in ammonia-contaminated gas：
2CO+O2→2CO2(3)
2H2+O2→2H2O(4)；
(8) waste gas after Denitration in Boiler is discharged through air-introduced machine by chimney.
After testing, discharged nitrous oxides concentration is 61mg/m in the present embodiment3。
A kind of Denitration in Boiler technique with ammonia-contaminated gas as denitrfying agent of embodiment 2
Technique is comprised the following steps that：
(1) in gasification furnace, coal and water react in the case of oxygen-enriched, produce based on process gas while the ammonia of thing containing side reaction
The thick process gas of gas, thick process gas wash tower into carbon, wash in tower in carbon and remove solid particulate matter；
(2) the thick process gas containing ammonia enter change furnace after carbon washes tower, in change furnace interior part carbon monoxide and vapor
Carbon dioxide and hydrogen are changed in the presence of catalyst, side reaction thing ammonia is not involved in reaction；
(3) the thick process gas containing ammonia enter heat-exchange system after change furnace, are lowered the temperature in heat-exchange system, thick process gas
Temperature drops to 40 DEG C from 430 DEG C, and pressure is 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 is inversely contacted, 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 is 0.2MPa, and water containing ammonia stripping is sprayed in stripper upper end, and bottom adds steam, steam
With the stream contact heat-exchanging of watery vomiting containing ammonia stripping, the ammonia being dissolved in washings is stripped becomes the ammonia-contaminated gas containing gaseous ammonia；
Ammonia-contaminated gas include ammonia, carbon monoxide, carbon dioxide, hydrogen, methane, nitrogen, hydrogen sulfide and carbonyl sulfide,
Temperature be 75 DEG C, pressure be 0.25MPa under the conditions of, ammonia, carbon monoxide, carbon dioxide, hydrogen, methane, nitrogen, hydrogen sulfide and
Carbonyl sulfide account for the volume fraction of ammonia-contaminated gas be respectively 20.35%, 13.82%, 51.36%, 13.58%, 0.04%,
0.13%th, 0.01%, 0.67% and 0.01%；
(6) ammonia-contaminated gas enter exhaust mixer after stripper, uniform with boiler secondary air in exhaust mixer
Mixing, ammonia-contaminated gas are 7 with the volume ratio of secondary wind:14000；
(7) out blown through boiler afterwards by exhaust mixer with the uniform mixed ammonia-contaminated gas of boiler secondary air and be
System, boiler is entered with gaseous state from the bottom of boiler, under the conditions of temperature is for 850-1150 DEG C, the flue gas in ammonia-contaminated gas and boiler
Be fully contacted, carry out denitration reaction, ammonia-contaminated gas in the boiler with the reduction reaction such as formula (1) and formula (2) of NOx in flue gas：
4NO+4NH3+O2→4N2+6H2O(1)
2NO2+4NH3+O2→3N2+6H2O(2)
Additionally, also there is the reaction such as formula (3) and formula (4) such as in boiler in ammonia-contaminated gas：
2CO+O2→2CO2(3)
2H2+O2→2H2O(4)；
(8) waste gas after Denitration in Boiler is discharged through air-introduced machine by chimney.
After testing, discharged nitrous oxides concentration is 65mg/m in the present embodiment3。
A kind of Denitration in Boiler system with ammonia-contaminated gas as denitrfying agent of embodiment 3, as shown in figure 1, system includes gasification furnace
1st, 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
9th, air-introduced machine 10 and chimney 11, gasification furnace 1 is connected by the import that pipeline and carbon wash tower 2, carbon wash the outlet of tower 2 by pipeline with
The import connection of change furnace 3, the outlet of change furnace 3 is connected with the import of heat-exchange system 4, the outlet of heat-exchange system 4 and ammonia stripping
The import connection of tower 5, ammonia stripping tower 5 is provided with gas outlet and liquid outlet, liquid outlet and the stripper 6 of ammonia stripping tower 5
Import connects, and the outlet of stripper 6 is connected with the import of exhaust mixer 7, exhaust mixer 7 through boiler supply air system 8 and
The bottom connection of boiler 9, the outlet of boiler 9 is connected through air-introduced machine 10 with chimney 11.
Claims (4)
1. a kind of Denitration in Boiler technique with ammonia-contaminated gas as denitrfying agent, it is characterised in that technique is comprised the following steps that：
(1) in gasification furnace, coal and water react in the case of oxygen-enriched, produce based on process gas the simultaneously ammonia of thing containing side reaction
Thick process gas, thick process gas are washed tower, wash in tower in carbon and remove solid particulate matter into carbon；
(2) the thick process gas containing ammonia enter change furnace after carbon washes tower, are urging in change furnace interior part carbon monoxide and vapor
Carbon dioxide and hydrogen are changed in the presence of agent, side reaction thing ammonia is not involved in reaction；
(3) the thick process gas containing ammonia enter heat-exchange system after change furnace, are lowered the temperature in heat-exchange system, unskilled workman's skill temperature degree
40 DEG C are dropped to from 430 DEG C, pressure is 6.0MPa；
(4) the thick process gas containing ammonia enter ammonia stripping tower after heat-exchange system, and the thick process gas containing ammonia are 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 is 0.2MPa, and water containing ammonia stripping is sprayed in stripper upper end, and bottom adds steam, steam with contain
Ammonia stripping watery vomiting stream contact heat-exchanging, the ammonia stripping being dissolved in washings becomes the ammonia-contaminated gas containing gaseous ammonia；
(6) ammonia-contaminated gas enter exhaust mixer after stripper, uniformly mix with boiler secondary air in exhaust mixer,
Ammonia-contaminated gas are 7 with the volume ratio of secondary wind:5000-15000；
(7) with the uniform mixed ammonia-contaminated gas of boiler secondary air by exhaust mixer out afterwards through boiler supply air system, with
Gaseous state enters boiler from lower portion thereof, and under the conditions of temperature is for 850-1150 DEG C, ammonia-contaminated gas fully connect with the flue gas in boiler
Touch, carry out denitration reaction, ammonia-contaminated gas in the boiler with the reduction reaction such as formula (1) and formula (2) of NOx in flue gas:
4NO+4NH3+O2→4N2+6H2O (1)
2NO2+4NH3+O2→3N2+6H2O (2)
Additionally, also there is the reaction such as formula (3) and formula (4) such as in boiler in ammonia-contaminated gas：
2CO+O2→2CO2 (3)
2H2+O2→2H2O (4)；
(8) waste gas after Denitration in Boiler is discharged through air-introduced machine by chimney.
2. a kind of Denitration in Boiler technique with ammonia-contaminated gas as denitrfying agent according to claim 1, it is characterised in that described
Ammonia-contaminated gas include ammonia, carbon monoxide, carbon dioxide, hydrogen, methane, nitrogen, hydrogen sulfide and carbonyl sulfide in step (5),
It it is 75 DEG C in temperature, pressure is ammonia, carbon monoxide, carbon dioxide, hydrogen, methane, nitrogen, hydrogen sulfide under the conditions of 0.25MPa
The volume fraction for accounting for ammonia-contaminated gas with carbonyl sulfide is respectively 20.35%, 13.82%, 51.36%, 13.58%, 0.04%,
0.13%th, 0.01%, 0.67% and 0.01%.
3. a kind of Denitration in Boiler technique with ammonia-contaminated gas as denitrfying agent according to claim 1, it is characterised in that described
Ammonia-contaminated gas enter exhaust mixer after stripper in step (6), uniformly mix with boiler secondary air in exhaust mixer
Close, ammonia-contaminated gas are 7 with the volume ratio of secondary wind:10000.
4. a kind of Denitration in Boiler system with ammonia-contaminated gas as denitrfying agent, it is characterised in that system include gasification furnace, carbon wash tower,
Change furnace, heat-exchange system, ammonia stripping tower, stripper, exhaust mixer, boiler supply air system, boiler, air-introduced machine and chimney, gas
Change stove to be connected by the import that pipeline and carbon wash tower, carbon is washed the outlet of tower and is connected with the import of change furnace by pipeline, change furnace
Outlet be connected with the import of heat-exchange system, the outlet of heat-exchange system is connected with the import of ammonia stripping tower, and ammonia stripping tower is provided with gas
Body is exported and liquid outlet, and the liquid outlet of ammonia stripping tower is connected with the import of stripper, and the outlet of stripper mixes with waste gas
The import connection of device, exhaust mixer is connected through boiler supply air system with the bottom of boiler, and the outlet of boiler is through air-introduced machine
It is connected with chimney.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108970353A (en) * | 2018-07-16 | 2018-12-11 | 西安华大骄阳绿色科技有限公司 | A kind of synthesis desulfurating method of denitration being catalyzed flue gas and the sour gas containing ammonia |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0783916A1 (en) * | 1996-01-12 | 1997-07-16 | Metallgesellschaft Ag | Process for the denitration of flue gases |
| CN101890279A (en) * | 2010-03-10 | 2010-11-24 | 张作保 | A kind of high-efficiency ammonia-method denitration process and device thereof |
| WO2013179462A1 (en) * | 2012-05-31 | 2013-12-05 | 三菱重工業株式会社 | System and method for treating mercury in flue gas |
| CN104028084A (en) * | 2014-03-29 | 2014-09-10 | 江苏永钢集团有限公司 | Method and equipment for denitration of flue gas produced in coal-fired power generation by using residual ammonia water |
| 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 |
-
2017
- 2017-01-13 CN CN201710025244.9A patent/CN106582226B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0783916A1 (en) * | 1996-01-12 | 1997-07-16 | Metallgesellschaft Ag | Process for the denitration of flue gases |
| CN101890279A (en) * | 2010-03-10 | 2010-11-24 | 张作保 | A kind of high-efficiency ammonia-method denitration process and device thereof |
| WO2013179462A1 (en) * | 2012-05-31 | 2013-12-05 | 三菱重工業株式会社 | System and method for treating mercury in flue gas |
| CN104028084A (en) * | 2014-03-29 | 2014-09-10 | 江苏永钢集团有限公司 | Method and equipment for denitration of flue gas produced in coal-fired power generation by using residual ammonia water |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108970353A (en) * | 2018-07-16 | 2018-12-11 | 西安华大骄阳绿色科技有限公司 | A kind of synthesis desulfurating method of denitration being catalyzed flue gas and the sour gas containing ammonia |
| 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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