CN206986110U - A kind of Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent - Google Patents
A kind of Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent Download PDFInfo
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- CN206986110U CN206986110U CN201720040429.2U CN201720040429U CN206986110U CN 206986110 U CN206986110 U CN 206986110U CN 201720040429 U CN201720040429 U CN 201720040429U CN 206986110 U CN206986110 U CN 206986110U
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Abstract
It the utility model is related to a kind of Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent, system includes gasification furnace, carbon washes tower, change furnace, heat-exchange system, ammonia stripping tower, stripper, exhaust mixer, boiler supply air system, boiler, air-introduced machine and chimney, the import that gasification furnace washes tower by pipeline with carbon is connected, the outlet that carbon washes tower is connected by the import of pipeline and change furnace, the outlet of change furnace and the import of heat-exchange system connect, the outlet of heat-exchange system is connected with the import of ammonia stripping tower, ammonia stripping tower is provided with gas vent and liquid outlet, the import of the liquid outlet and stripper of ammonia stripping tower connects, the outlet of stripper and the import of exhaust mixer connect, exhaust mixer connects by the bottom of boiler supply air system and boiler, the outlet of boiler is connected by air-introduced machine with chimney.The utility model significantly reduces the cost of Denitration in Boiler, reduces denitrification apparatus investment, while ammonia-contaminated gas can also be made to get utilization, and reduces environmental pollution.
Description
Technical field
A kind of Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent is the utility model is related to, belongs to denitration of boiler smoke skill
Art field.
Background technology
In Chemical Manufacture, conventional utility boiler produces vapor.In boiler combustion process, coal produces titanium dioxide with oxygen reaction
Carbon, release heat.In combustion, because also containing element sulphur and nitrogen in coal, except producing carbon dioxide, also simultaneously
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 mainly selective catalytic reduction technique (SCR), SNCR technology
(SNCR), hybrid SC R+SNCR technologies etc., wherein traditional SNCR technologies typically using the chemical reducing agent such as ammoniacal liquor, urea and
NOx reacts, by NOx conversion into nitrogen and water.Usual Chemical Manufacture enterprise needs the chemical reducing agents such as outsourcing ammoniacal liquor, urea 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 big, the problem of easily causing back-end ductwork to be blocked.
Gasification furnace can produce the thick process gas containing ammonia in Chemical Manufacture.Carbon monoxide, hydrogen, carbon dioxide in thick process gas
As effective process gas, transformed stove is reacted part carbon monoxide, changes into carbon dioxide and hydrogen, through heat-exchange system
Process gas after cooling strips through the washing of ammonia stripping tower and stripper decompression, heating, obtains the ammonia-contaminated gas containing gaseous ammonia.Should
Contain a certain amount of ammonia in ammonia-contaminated gas, while also directly discharged containing carbon dioxide, carbon monoxide, hydrogen, ammonia-contaminated gas
Serious environmental pollution can be caused into air.
The content of the invention
The utility model provides a kind of Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent, significantly reduces boiler and takes off
The cost of nitre, reduce denitrification apparatus investment, while ammonia-contaminated gas can also be made to get utilization, reduce environmental pollution.
The technical solution of the utility model is as follows：
A kind of Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent, system includes gasification furnace, carbon is washed tower, change furnace, changed
Hot systems, ammonia stripping tower, stripper, exhaust mixer, boiler supply air system, boiler, air-introduced machine and chimney, gasification furnace pass through pipe
The import that tower is washed in road with carbon is connected, and the outlet that carbon washes tower is connected by the import of pipeline and change furnace, and the outlet of change furnace is with changing
The import connection of hot systems, the outlet of heat-exchange system are connected with the import of ammonia stripping tower, and ammonia stripping tower is provided with gas vent and liquid
Body is exported, and the liquid outlet of ammonia stripping tower is connected by the import of pipeline and stripper, and the outlet of stripper by pipeline and is given up
The import connection of gas blender, exhaust mixer connect by the bottom of boiler supply air system and boiler, and the outlet of boiler is passed through
Air-introduced machine is connected with chimney.
On the basis of above-mentioned technical proposal, the import of the ammonia stripping tower is located at the bottom of ammonia stripping tower；Unskilled workman containing ammonia
Skill gas is inversely contacted in scrubbing tower with shower water, and ammonia is dissolved in water, and forms water containing ammonia stripping.
On the basis of above-mentioned technical proposal, the import of the stripper is located at the upper end of stripper；In the stripper
Also include nozzle, the import of stripper is connected with spray head.Water containing ammonia stripping sprays into stripper upper end, and middle part adds steam, steams
Vapour exchanges heat with the counter current contacting of water containing ammonia stripping, and the ammonia stripping being dissolved in washings turns into the ammonia-contaminated gas containing gaseous ammonia.
A kind of Denitration in Boiler technique using ammonia-contaminated gas as denitrfying agent, comprise 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, are washed in carbon and solid particulate matter is removed in tower；
(2) the thick process gas containing ammonia enters change furnace after carbon washes tower, in change furnace inside points carbon monoxide and vapor
Carbon dioxide and hydrogen are changed into the presence of catalyst, side reaction thing ammonia is not involved in reacting；
(3) the thick process gas containing ammonia enters heat-exchange system after change furnace, is cooled 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 enters ammonia stripping tower after heat-exchange system, the thick process gas containing ammonia in scrubbing tower with spray
Water drenching is inversely contacted, and under 6.0MPa pressure, 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 sprays into stripper upper end, and middle part adds steam, steam
Exchanged heat with the counter current contacting of water containing ammonia stripping, the ammonia stripping being dissolved in washings turns into 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) with boiler secondary air uniformly mixed ammonia-contaminated gas by exhaust mixer come out after by boiler blow be
System, enters boiler with gaseous state from the bottom of boiler, under the conditions of temperature is 850-1150 DEG C, ammonia-contaminated gas and the flue gas in boiler
Fully contact, carry out denitration reaction, the ammonia-contaminated gas reduction reaction such as formula (1) and formula (2) with NOx in flue gas in the boiler:
4NO+4NH3+O2→4N2+6H2O (1)
2NO2+4NH3+O2→3N2+6H2O (2)
In addition, the reaction such as formula (3) and formula (4) such as also occurs in boiler for ammonia-contaminated gas：
2CO+O2→2CO2 (3)
2H2+O2→2H2O (4)；
(8) waste 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, temperature be 75 DEG C, pressure be 0.25MPa under the conditions of, ammonia, carbon monoxide, carbon dioxide,
The volume fraction that hydrogen, methane, nitrogen, hydrogen sulfide and carbonyl sulfide account for ammonia-contaminated gas is 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 mainly produce carbon monoxide, carbon dioxide, hydrogen when being reacted in the case of oxygen-enriched,
Due to containing nitrogen in coal, while side reaction occurs and produces ammonia.Wherein carbon monoxide, hydrogen, carbon dioxide are as effective
The transformed stove of process gas is reacted part carbon monoxide, changes into 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 ammonia caused by side reaction through Ammonic washing tower, clean
The next workshop section of technique pneumatic transmission, the washings rich in ammonia depressurize through stripper, heat stripping, the ammonolysis being dissolved in washings
Inhaling turns into the ammonia-contaminated gas containing gaseous ammonia, and in caused ammonia-contaminated gas, 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 of reaction then
Escape to rear workshop section.(3m is left to 850-1100 DEG C of furnace outlet (37m or so), furnace outlet to superheater entrance for lower furnace portion
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, is reaction zone from lower furnace portion to the process of superheater entrance 40m or so flue gas circulation, with tradition
SNCR technologies carry out addition with 5% or so ammoniacal liquor in boiler furnace outlet and compared, and add the residence time of reactant, increase
The time that reactant is reacted, reaction efficiency is improved, because being in all the time in reaction temperature in the whole course of reaction, and
Contain fuel gas in ammonia-contaminated gas, ensure that the reaction temperature in course of reaction, because whole reaction temperature is protected, reacts
The thing residence time 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
Ammonium sulfate, the larger crystal of ammonium sulfite viscosity, crystal are 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.
The utility model has advantages below compared with prior art：
By the utility model, reduce pollution from exhaust emission, significantly reduce denitrating flue gas cost, it is new by this practicality
The Denitration in Boiler system of type so that discharged nitrous oxides concentration is less than 100mg/m3.The utility model causes the stop of reactant
Time lengthening, reaction temperature is ensure that, reduce amount of ammonia slip, achieve good economic benefit and environmental benefit, simultaneously
Reduce back-end ductwork and dirty stifled possibility occurs because crystal is mixed with ash.
Brief description of the drawings
Fig. 1 is the utility model process chart；
Fig. 2 is import and spray head attachment structure schematic diagram in stripper.
Symbol description
1. gasification furnace, 2. carbon wash tower, 3. change furnaces, 4. heat-exchange systems, 5. ammonia stripping towers, 6. strippers, the mixing of 7. waste gas
Device, 8. boiler supply air systems, 9. boilers, 10. air-introduced machines, 11. chimneys, 12. spray heads.
Embodiment
The utility model is further described with reference to specific embodiment, and the advantages of the utility model and feature will be with
Description and it is apparent.But embodiment is only exemplary, does not form any restrictions to the scope of the utility model.Ability
Field technique personnel should be understood that can be to the utility model technical side under without departing from spirit and scope of the present utility model
The details and form of case are modified or replaced, but these modifications and replacement are each fallen within the scope of protection of the utility model.
A kind of Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent of embodiment 1, 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, the import that gasification furnace 1 washes tower 2 by pipeline with carbon are connected, carbon wash the outlet of tower 2 by pipeline with
The import connection of change furnace 3, the outlet of change furnace 3 are 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 are provided with gas vent and liquid outlet, and the liquid outlet of ammonia stripping tower 5 passes through pipeline and vapour
The import connection of stripper 6, the outlet of stripper 6 are connected by pipeline with the import of exhaust mixer 7, and exhaust mixer 7 is passed through
Boiler supply air system 8 is connected with the bottom of boiler 9, and the outlet of boiler 9 is connected by air-introduced machine 10 with chimney 11.
Embodiment 2
On the basis of embodiment 1, as depicted in figs. 1 and 2, the import of the ammonia stripping tower 5 is located under ammonia stripping tower 5
Portion；The import of the stripper 6 is located at the upper end of stripper 6；Also include spray head 12 in the stripper 6, stripper 6
Import is connected with spray head 12.
Claims (5)
- A kind of 1. Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent, it is characterised in that system includes gasification furnace, carbon washes tower, Change furnace, heat-exchange system, ammonia stripping tower, stripper, exhaust mixer, boiler supply air system, boiler, air-introduced machine and chimney, gas The import that change stove washes tower by pipeline with carbon is connected, and the outlet that carbon washes tower is connected by the import of pipeline and change furnace, change furnace Outlet and the import of heat-exchange system connect, the outlet of heat-exchange system is connected with the import of ammonia stripping tower, and ammonia stripping tower is provided with gas Body exports and liquid outlet, and the import of the liquid outlet and stripper of ammonia stripping tower connects, and the outlet of stripper mixes with waste gas The import connection of device, exhaust mixer connect by the bottom of boiler supply air system and boiler, and air-introduced machine is passed through in the outlet of boiler It is connected with chimney.
- A kind of 2. Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent according to claim 1, it is characterised in that the ammonia The import of scrubbing tower is located at the bottom of ammonia stripping tower.
- A kind of 3. Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent according to claim 1, it is characterised in that the vapour The import of stripper is located at the upper end of stripper.
- A kind of 4. Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent according to claim 3, it is characterised in that the vapour Also include nozzle in stripper, the import of stripper is connected with spray head.
- 5. a kind of Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent according to claim 1, it is characterised in that described to change Hot systems are vapour-water heat-exchange system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720040429.2U CN206986110U (en) | 2017-01-13 | 2017-01-13 | A kind of Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720040429.2U CN206986110U (en) | 2017-01-13 | 2017-01-13 | A kind of Denitration in Boiler system using ammonia-contaminated gas as denitrfying agent |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106582226A (en) * | 2017-01-13 | 2017-04-26 | 久泰能源内蒙古有限公司 | Boiler denitration process taking ammonia-containing waste gas as denitration agent |
| 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 |
| CN110261546A (en) * | 2019-06-28 | 2019-09-20 | 中冶南方都市环保工程技术股份有限公司 | The experimental rig and method of active coke desulphurizing and denitration performance can be tested simultaneously |
| CN113617199A (en) * | 2021-09-03 | 2021-11-09 | 山西化美环保科技有限公司 | Process method for treating tail gas containing hydrogen sulfide by using double-alkali method |
-
2017
- 2017-01-13 CN CN201720040429.2U patent/CN206986110U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106582226A (en) * | 2017-01-13 | 2017-04-26 | 久泰能源内蒙古有限公司 | Boiler denitration process taking ammonia-containing waste gas as denitration agent |
| 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 |
| CN110261546A (en) * | 2019-06-28 | 2019-09-20 | 中冶南方都市环保工程技术股份有限公司 | The experimental rig and method of active coke desulphurizing and denitration performance can be tested simultaneously |
| CN113617199A (en) * | 2021-09-03 | 2021-11-09 | 山西化美环保科技有限公司 | Process method for treating tail gas containing hydrogen sulfide by using double-alkali method |
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| GR01 | Patent grant | ||
| CP03 | "change of name, title or address" |
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: 010321 Dalu New District, Ordos City, Inner Mongolia Autonomous Region Patentee before: JIUTAI ENERGY INNER MONGOLIA Co.,Ltd. |
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| CP03 | "change of name, title or address" |