CN107158925A - A kind of SCR boilers air preheater anti-blocking method - Google Patents
A kind of SCR boilers air preheater anti-blocking method Download PDFInfo
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- CN107158925A CN107158925A CN201710542375.4A CN201710542375A CN107158925A CN 107158925 A CN107158925 A CN 107158925A CN 201710542375 A CN201710542375 A CN 201710542375A CN 107158925 A CN107158925 A CN 107158925A
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- air preheater
- potassium carbonate
- ammonia
- scr
- boilers
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The present invention provides a kind of SCR boilers air preheater anti-blocking method, reacted to generate the hydrogen sulfate ammonia powder with adherence according to ammonia and sulfur trioxide, the hydrogen sulfate ammonia powder is advanced after being condensed with the solid granulates in flue gas along flow of flue gas direction, finally it is attached on air preheater, the blocking until causing air preheater；Utilize SO3Highly acid with alkalescence carbonic acid nak response, so as to reduce the generation of hydrogen sulfate ammonia, the potassium sulfate powder can will not cause the blocking of air preheater in the presence of flue gas stream by air preheater.
Description
Technical field
The invention belongs to field of boilers, more particularly to a kind of SCR boilers air preheater anti-blocking method.
Background technology
At present in the industrial production, in order to reduce NOx, generally using SCR.And in combustion, the S in coal has part
SO can be converted into3（Including SO2Sulphate decomposition discharges in oxidation, coal）, the NH in SCR3With SO3Combine to form NH4HSO4、
(NH4)2SO4, and NH4HSO4250OC or so starts solidification, causes air preheater to block.
To prevent the blocking of air preheater it is necessary to preventing NH4HSO4、(NH4)2SO4Generation, can start with terms of two,
One kind is reduction NH3Concentration, but this is difficult, because spraying into NH before SCR3When being mixed in flue gas, in flue gas
There is the SO produced through burning3, so as to initially form NH4HSO4、(NH4)2SO4, and the NH in SCR3During for denitration, urge
Agent promotes SO2It is converted into SO3If now there is a small amount of NH3Escape, then it is inevitable to be catalyzed the SO produced with SCR3Combine to form
NH4HSO4、(NH4)2SO4, therefore attempt to reduce NH3The generation for escaping to reduce its sulfate is difficult to be realized in engineering,
Another is reduction SO3Concentration.
The content of the invention
In order to realize that, according to object of the present invention and further advantage, the present invention provides a kind of SCR boilers air preheater and prevented
Blocking method, coal is in pot furnace reduction burning generation NOX, generation ammonia is generally decomposed using ammoniacal liquor, liquefied ammonia or urea, using ammonia with
NOXReaction generation nitrogen, the course of reaction is slow, therefore is generally accelerated using catalyst, and these catalyst are not only catalyzed
Ammonia and NOXReaction, the sulphur that coal contains during burning is partially converted into SO3, catalyst can also make burning produce SO2To SO3Instead
Should, it is characterised in that potassium carbonate injection apparatus is set positioned at the upstream of air preheater on boiler flue, SO is utilized3Highly acid
With the carbonic acid nak response of alkalescence, so as to reduce the generation of hydrogen sulfate ammonia, chemical equation is as follows：K2CO3+SO3=K2SO4+
CO2↑, the potassium sulfate powder can will not cause the blocking of air preheater in the presence of flue gas stream by air preheater, it is to avoid
The ammonia that reaction is had neither part nor lot in SCR catalytic device and is escaped reacts to generate the hydrogen sulfate ammonia with adherence with sulfur trioxide
Solid, hydrogen sulfate ammonia is advanced after being condensed with the solid granulates in flue gas along flow of flue gas direction, is finally attached on air preheater, directly
To the blocking for causing air preheater.
It is preferred that, described potassium carbonate injection apparatus includes shower nozzle, control valve, hot air duct, and described hot air duct connects
Air preheater is connect, described air preheater is connected with air blower, and in the presence of the air blower, air is pre- with sky outside air preheater
Device inside smoke exchanges heat, and forms hot blast, and hot blast drives potassium carbonate powder to be blown into the boiler flue below shower nozzle through hot air duct
Interior, hot blast drives potassium carbonate powder to be reacted with sulfur trioxide.
It is preferred that, the upstream of boiler flue potassium carbonate injection apparatus is provided with sulfur content monitor, described sulfur content prison
The content that instrument is used to monitor sulphur in boiler flue is surveyed, sulfur content monitor is also connected with the control valve of potassium carbonate injection apparatus, according to
Sulfur content monitor detects the content of the sulphur of flue gas in the boiler flue come to control the straying quatity of the potassium carbonate powder, institute
The mol ratio for stating potassium carbonate powder and the sulphur flow is 1:0.7.
It is preferred that, the position that the potassium carbonate powder enters flue is located at 500 ° of -800 °Yan Yi area in flue.
The present invention provides a kind of SCR boilers air preheater anti-blocking method, is reacted by the sulfur trioxide in potassium carbonate and flue gas
Potassium sulfate is generated, and then reduces the content of sulfur trioxide in flue gas, the generation of solidfied material can be effectively reduced, so as to reach sky
The anti-blocking purpose of pre- device.
Further advantage, target and the feature of the present invention embodies part by following explanation, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Brief description of the drawings
A kind of schematic diagram for SCR boilers air preheater anti-blocking method that Fig. 1 provides for the present invention.
In figure：1st, shower nozzle；2nd, control valve；3rd, sulfur content monitor；4th, air blower；5th, air preheater；6th, hot air duct.
Embodiment
In order to be able to be more clearly understood that technical scheme, the present invention is further described below in conjunction with the accompanying drawings.
The present invention provides a kind of SCR boilers air preheater anti-blocking method, and coal is in pot furnace reduction burning generation NOX, generally adopt
Generation ammonia is decomposed with ammoniacal liquor, liquefied ammonia or urea, ammonia and NO is utilizedXReaction generation nitrogen, the course of reaction is slow, therefore generally
Accelerated using catalyst, these catalyst are not only catalyzed ammonia and NOXReaction, the sulphur that coal contains during burning is partially converted into
SO3, catalyst can also make burning produce SO2To SO3Reaction, it is characterised in that be located at the upstream of air preheater on boiler flue
Potassium carbonate injection apparatus is set, SO is utilized3Highly acid and the carbonic acid nak response of alkalescence, so as to reduce the generation of hydrogen sulfate ammonia,
Chemical equation is as follows：K2CO3+SO3=K2SO4+CO2↑, the potassium sulfate powder can pass through in the presence of flue gas stream
Air preheater 5, will not cause the blocking of air preheater 5, it is to avoid ammonia and three oxidations of reaction and escape are had neither part nor lot in SCR catalytic device
Reaction of Salmon-Saxl is so as to generate the hydrogen sulfate ammonia solid with adherence, along flue gas after the solid granulates condensation in hydrogen sulfate ammonia and flue gas
Flow direction is advanced, and is finally attached on air preheater 5, the blocking until causing air preheater 5.
Described potassium carbonate injection apparatus includes shower nozzle 1, control valve 2, hot air duct 6, and described hot air duct 6 connects sky
Pre- device 5, described air preheater 5 is connected with air blower 4, in the presence of the air blower 4, and air is in the outside of air preheater 5 and sky
The pre- inside smoke of device 5 heat exchange, forms hot blast, and hot blast drives potassium carbonate powder to be blown into the boiler smoke below shower nozzle through hot air duct 6
In road, hot blast drives potassium carbonate powder to be reacted with sulfur trioxide.
The upstream of boiler flue potassium carbonate injection apparatus is provided with sulfur content monitor 3, and described sulfur content monitor 3 is used
In the content of sulphur in monitoring boiler flue, sulfur content monitor 3 is also connected with the control valve 2 of potassium carbonate injection apparatus, contained according to sulphur
Amount monitor 3 detects the content of the sulphur of flue gas in the boiler flue come to control the straying quatity of the potassium carbonate powder, described
Potassium carbonate powder and the mol ratio of the sulphur flow are 1:0.7.
The position that the potassium carbonate powder enters flue is located at 500 ° of -800 °Yan Yi area in flue.
After potassium carbonate powder shower nozzle 1 is opened, start air blower 4, in the presence of air blower 4, air is outside air preheater 5
Portion exchanges heat with the inside smoke of air preheater 5, forms hot blast, and hot blast drives potassium carbonate powder to be blown into the lower section of shower nozzle 1 through hot air duct 6
Boiler flue in, according to the numerical value of sulfur content monitor 3 come adjusting control valve 2, so as to control the straying quatity of potassium carbonate powder,
Fully potassium sulfate powder is formed after reaction.
Described above is only the better embodiment of the present invention, therefore all constructions according to described in present patent application scope,
The equivalent change or modification that feature and principle are done, is included in the range of present patent application.
Claims (4)
1. a kind of SCR boilers air preheater anti-blocking method, coal is in pot furnace reduction burning generation NOX, generally using ammoniacal liquor, liquefied ammonia or
Urea decomposes generation ammonia, utilizes ammonia and NOXReaction generation nitrogen, the course of reaction is slow, therefore is generally urged using catalyst
Change and accelerate, these catalyst are not only catalyzed ammonia and NOXReaction, the sulphur that coal contains during burning is partially converted into SO3, catalyst is also
The SO that can produce burning2To SO3Reaction, it is characterised in that set potassium carbonate to spray positioned at the upstream of air preheater on boiler flue
Injection device, utilizes SO3Highly acid with alkalescence carbonic acid nak response, so as to reduce the generation of hydrogen sulfate ammonia, chemical reaction equation
Formula is as follows：K2CO3+SO3=K2SO4+CO2↑, the potassium sulfate powder, can be by air preheater in the presence of flue gas stream, will not
Cause the blocking of air preheater, it is to avoid the ammonia that reaction is had neither part nor lot in SCR catalytic device and is escaped is reacted so as to raw with sulfur trioxide
Into the hydrogen sulfate ammonia solid with adherence, along flow of flue gas direction row after the solid granulates condensation in hydrogen sulfate ammonia and flue gas
Enter, be finally attached on air preheater, the blocking until causing air preheater.
2. SCR boilers air preheater anti-blocking method according to claim 1, it is characterised in that described potassium carbonate injection dress
Put including shower nozzle, control valve, hot air duct, described hot air duct connection air preheater, described air preheater is connected with air blower,
In the presence of the air blower, air exchanges heat outside air preheater with air preheater inside smoke, forms hot blast, hot blast is through hot blast
Pipeline, drives potassium carbonate powder to be blown into the boiler flue below shower nozzle, and hot blast drives potassium carbonate powder to be reacted with sulfur trioxide.
3. SCR boilers air preheater anti-blocking method according to claim 1 or 2, it is characterised in that boiler flue potassium carbonate sprays
The upstream of injection device is provided with sulfur content monitor, and described sulfur content monitor is used for the content for monitoring sulphur in boiler flue,
Sulfur content monitor is also connected with the control valve of potassium carbonate injection apparatus, according to sulfur content monitor detect come boiler flue in
The content of the sulphur of flue gas controls the straying quatity of the potassium carbonate powder, the potassium carbonate powder and the mol ratio of the sulphur flow
For 1:0.7.
4. SCR boilers air preheater anti-blocking method according to claim 1, it is characterised in that the potassium carbonate powder enters
The position of flue is located at 500 ° of -800 °Yan Yi area in flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710542375.4A CN107158925A (en) | 2017-07-05 | 2017-07-05 | A kind of SCR boilers air preheater anti-blocking method |
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| CN201710542375.4A CN107158925A (en) | 2017-07-05 | 2017-07-05 | A kind of SCR boilers air preheater anti-blocking method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109631075A (en) * | 2019-01-31 | 2019-04-16 | 南京博沃科技发展有限公司 | A kind of anti-blocking grey air quantity adjusting method of air preheater and device for monitoring running |
| CN111068485A (en) * | 2019-12-25 | 2020-04-28 | 天津天钢联合特钢有限公司 | Method for preventing denitration catalyst from being blocked |
| CN113731113A (en) * | 2021-09-15 | 2021-12-03 | 北京工大环能科技有限公司 | System for reducing blockage of ammonium bisulfate of air preheater of coal-fired power plant |
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| CN105854557A (en) * | 2016-04-21 | 2016-08-17 | 上海迪夫格环境科技有限公司 | Method and device for evenly spraying alkali liquor to remove sulfur trioxide in exhaust gas |
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| CN205535924U (en) * | 2016-03-11 | 2016-08-31 | 华电电力科学研究院 | Rotation air preheater flue gas prevents against current that ammonium hydrogen sulfate blocks up device |
| CN106492603A (en) * | 2016-11-21 | 2017-03-15 | 西安交通大学 | A kind of device for removing sulfur trioxide before air preheater |
| CN106621785A (en) * | 2017-02-23 | 2017-05-10 | 东方电气集团东方锅炉股份有限公司 | Device and method for removing sulfur trioxide in boiler flue gas |
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| CN104033921A (en) * | 2014-06-20 | 2014-09-10 | 国家电网公司 | Device and method for preventing ammonium bisulfate from blocking air preheaters of coal-fired boiler |
| CN104474897A (en) * | 2014-12-02 | 2015-04-01 | 中国大唐集团科学技术研究院有限公司 | Method for removing sulfur trioxide from coal-fired flue gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109631075A (en) * | 2019-01-31 | 2019-04-16 | 南京博沃科技发展有限公司 | A kind of anti-blocking grey air quantity adjusting method of air preheater and device for monitoring running |
| CN111068485A (en) * | 2019-12-25 | 2020-04-28 | 天津天钢联合特钢有限公司 | Method for preventing denitration catalyst from being blocked |
| CN113731113A (en) * | 2021-09-15 | 2021-12-03 | 北京工大环能科技有限公司 | System for reducing blockage of ammonium bisulfate of air preheater of coal-fired power plant |
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Application publication date: 20170915 |
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