CN208449061U - It is a kind of using ammonium hydroxide as the SCR equipment for denitrifying flue gas of reducing agent - Google Patents
It is a kind of using ammonium hydroxide as the SCR equipment for denitrifying flue gas of reducing agent Download PDFInfo
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- CN208449061U CN208449061U CN201820731229.6U CN201820731229U CN208449061U CN 208449061 U CN208449061 U CN 208449061U CN 201820731229 U CN201820731229 U CN 201820731229U CN 208449061 U CN208449061 U CN 208449061U
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Abstract
The utility model discloses a kind of using ammonium hydroxide as the SCR equipment for denitrifying flue gas of denitrification reducing agent, including ammonium hydroxide gasification injection unit, SCR denitration reaction device gas approach, SCR denitration reaction device and air preheater, for SCR denitration reaction device gas approach between boiler economizer and SCR denitration reaction device, the outlet of SCR denitration reaction device is arranged in air preheater；Ammonium hydroxide gasification injection unit includes air hose, air-flue gas pipe heat exchanger, hot-air duct, ammonium hydroxide gasifier and ammonia-air mixture pipeline.The utility model is able to solve rotary regenerative air preheater boiler smoke using ammonium hydroxide as the SCR denitrating flue gas problem of reducing agent, while solving SCR flue-gas denitration process complexity, AIG blockage problem, achievees the purpose that reduce investment, operating cost and energy consumption.
Description
Technical field
The utility model relates to the technical fields of denitrating flue gas, more particularly, are related to a kind of using ammonium hydroxide as reducing agent
SCR equipment for denitrifying flue gas.
Background technique
Denitrating flue gas reducing agent mainly has liquefied ammonia, ammonium hydroxide, urea, wherein liquefied ammonia belongs to high-risk chemicals, transport and
Storage request is harsh and is limited more and more by policy, regulation, extremely inconvenient；Urea is transported in which although can be convenient
Defeated, storage and use, but so that urea is resolved into gas ammonia to need to consume a large amount of heat, energy consumption larger；And ammonium hydroxide is taken into account
Liquefied ammonia and urea characteristic have coal-burning boiler or the thermal power plant of ammonium hydroxide by-product especially for periphery, using ammonium hydroxide as de-
Nitre reducing agent more has cost-effective advantages.
Ammonium hydroxide main component is NH3·H2O contains a small amount of NH4+And OH-, ammonium hydroxide is light-exposed, is heated and easily resolves into NH3With
Water.For ammonium hydroxide as denitrating flue gas reducing agent, common technology is the individual ammonium hydroxide stripper plant of setting, by ammonium hydroxide gasification, is purified to
After ammonia, then pure ammonia is injected into flue gas and carries out denitration, the ammonium hydroxide of such technique gasifies cost of investment greatly and operating cost
It is high.
It is a kind of more than the combustion engine exhaust pass direct injection ammonium hydroxide that notification number is that CN202844886U Chinese patent discloses
Hot stove SCR equipment for denitrifying flue gas, the patented technology are primarily suitable for combustion engine waste-heat oven denitrating flue gas, are not suitable for coal-burning boiler.
Notification number CN203437023U is that Chinese patent discloses a kind of denitrification reducing agent ammonium hydroxide gasification installation, and gasify heat source
Using 200 DEG C of boiler or more of gas, the tubular air which can only be directed to smokeless gas leakage in engineering construction is pre-
The heat source that one/Secondary Air of boiler hot gasifies as ammonium hydroxide can be used in the denitration of boiler smoke of hot device.And for rotary air
The boiler of preheater, due to smoke spillage, the equal dust-laden of hot one/Secondary Air, if will lead to ammonium hydroxide gasification as ammonium hydroxide gasification heat source
Device, ammonia injection grid (AIG) blocking, influence denitration, therefore, which is not suitable for large coal-fired boiler, is not particularly suitable for
The denitration of boiler smoke of rotary regenerative air preheater.
The Chinese patent of notification number CN106422772A discloses one kind in SCR denitrating flue gas gas approach inner direct
The method of ammonium hydroxide gasification is difficult to ensure after the ammonium hydroxide gasification sprayed in the technology and is uniformly mixed with flue gas, influences denitration efficiency.
Utility model content
In order to solve the problems in the existing technology, the purpose of the utility model is to provide one kind using ammonium hydroxide as reducing agent
SCR equipment for denitrifying flue gas, be able to solve rotary regenerative air preheater boiler smoke using ammonium hydroxide as the SCR denitrating flue gas of reducing agent
Problem, while SCR flue-gas denitration process complexity, AIG blockage problem are solved, reach the mesh for reducing investment, operating cost and energy consumption
's.
The utility model discloses a kind of using ammonium hydroxide as the SCR equipment for denitrifying flue gas of reducing agent, and described device includes ammonium hydroxide
Gasification injection unit, SCR denitration reaction device gas approach, SCR denitration reaction device and air preheater, SCR denitration reaction device enter
For mouth flue between boiler economizer and SCR denitration reaction device, the outlet of SCR denitration reaction device is arranged in air preheater；
Wherein, ammonium hydroxide gasification injection unit includes air hose, air-flue gas pipe heat exchanger, hot-air duct, ammonium hydroxide gasification
Device and ammonia-air mixture pipeline, air-flue gas pipe heat exchanger are arranged in SCR denitration reaction device gas approach, empty
Gas-flue gas pipe heat exchanger gas access is connect by air hose with air preheater and the gas of gas vent and ammonium hydroxide gasifier
The connection of body entrance, the gas vent of ammonium hydroxide gasifier are connected with ammonia-air mixture pipeline, ammonia-air mixture pipeline
Gas vent be located in the SCR denitration reaction device gas approach.
According to the utility model using ammonium hydroxide as one embodiment of the SCR equipment for denitrifying flue gas of reducing agent, the ammonium hydroxide gas
Changing injection unit further includes the ammonia injection grid that ammonia-air mixture pipeline gas outlet is arranged in.
According to the utility model using ammonium hydroxide as one embodiment of the SCR equipment for denitrifying flue gas of reducing agent, the ammonia note
Grid is penetrated to be arranged between boiler economizer and air-flue gas pipe heat exchanger.
According to the utility model using ammonium hydroxide as one embodiment of the SCR equipment for denitrifying flue gas of reducing agent, on the air hose
Adjusting control valve is set, is provided with temperature monitor on the ammonia-air mixture pipeline.
According to the utility model using ammonium hydroxide as one embodiment of the SCR equipment for denitrifying flue gas of reducing agent, the ammonium hydroxide gas
Change in device and be provided with ammonia atomization spray gun, the ammonia atomization spray gun, which connects, draws ammonium hydroxide.
According to the utility model using ammonium hydroxide as one embodiment of the SCR equipment for denitrifying flue gas of reducing agent, the air hose is connect
Draw the cold First air of part boiler and/or the cold Secondary Air in air preheater, wherein the cold First air of the part boiler and/or
Cold Secondary Air accounts for the 0.5~5% of total blast volume and pressure is 2~15kP, temperature is 0~50 DEG C.
Compared with prior art, the utility model solves conventional ammonia by the SCR equipment for denitrifying flue gas of reducing agent of ammonium hydroxide
Water is the problem that the SCR denitration process of reducing agent is complicated, energy consumption is high, investment and operating cost are high, and also solving conventional ammonium hydroxide is
The SCR denitrating flue gas AIG blockage problem of reducing agent；The uniformity for not only contributing to improve ammonia air mixture and flue gas, is improved
SCR denitration efficiency, but also can reduce SCR denitration reducing agent ammonium hydroxide gasification energy consumption and station service, save operating cost；Separately
Outside, influence of the improvement to boiler is small or substantially negligible, will not influence the work of current technology and device.
Detailed description of the invention
Fig. 1 is shown according to the utility model exemplary embodiment using ammonium hydroxide as the SCR equipment for denitrifying flue gas of reducing agent
Structural schematic diagram.
Description of symbols:
1- flue gas, 2- ammonium hydroxide, 3- economizer, 4-SCR denitration reactor inlet flue, 5-SCR Benitration reactor, 6- ammonium hydroxide
Gasify injection unit, 61- air hose, 611- adjusting control valve, 62- air-flue gas pipe heat exchanger, 63- hot-air duct, 64-
Ammonium hydroxide gasifier, 641- ammonia atomization spray gun, 65- ammonia-air mixture pipeline, 651- temperature monitor, the injection of 66- ammonia
Grid, 7- air preheater.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
?.
In view of defect present in existing method of denitration, the utility model is cold primary by part boiler using boiler smoke
The heat source that wind and/or cold Secondary Air are heated into hot-air and gained hot-air gasify as ammonium hydroxide, obtains after ammonium hydroxide is gasified
Ammonia and vapor be mixed to form with hot-air ammonia-air mixture return mix with boiler smoke after progress flue gas take off
Nitre.
Wherein, the temperature of boiler smoke is 280~450 DEG C, and the cold First air of part boiler and/or cold Secondary Air are heated
The temperature of obtained hot-air is 150~350 DEG C, and the hot-air of the temperature is enough to realize the gasification of denitrification reducing agent ammonium hydroxide.With
Afterwards, under the action of denitrating catalyst, the NOx in ammonia and boiler smoke occurs chemical reaction and generates harmless N2Reach with water
Denitration purpose.
Rotary regenerative air preheater boiler smoke is efficiently solved as a result, using ammonium hydroxide as the SCR denitrating flue gas of reducing agent
Problem, while the cold First air of dustless boiler and/or Secondary Air is utilized, it is able to solve SCR flue-gas denitration process complexity, AIG
Blockage problem achievees the purpose that reduce investment, operating cost and energy consumption.
Fig. 1 is shown according to the utility model exemplary embodiment using ammonium hydroxide as the SCR equipment for denitrifying flue gas of reducing agent
Structural schematic diagram.
As shown in Figure 1, exemplary embodiment according to the present utility model, described de- by the SCR flue gas of reducing agent of ammonium hydroxide
Nitre device includes ammonium hydroxide gasification injection unit 6, SCR denitration reaction device gas approach 4, SCR denitration reaction device 5 and air preheater
7, between boiler economizer 3 and SCR denitration reaction device 5, the setting of air preheater 7 exists SCR denitration reaction device gas approach 4
The outlet of SCR denitration reaction device 5.Wherein, boiler economizer 3, SCR denitration reaction device 5 and air preheater 7 can be using these
The common construction and arrangement mode in field is preferably arranged with 1-4 layers of catalyst inside SCR denitration reaction device 5.
Wherein, ammonium hydroxide gasification injection unit 6 include air hose 61, air-flue gas pipe heat exchanger 62, hot-air duct 63,
Ammonium hydroxide gasifier 64 and ammonia-air mixture pipeline 65, air-flue gas pipe heat exchanger 62 are arranged in SCR denitration reaction device
In gas approach 4, air-flue gas pipe heat exchanger 62 gas access is connect by air hose 61 with air preheater 7 and gas
Outlet is connect with the gas access of ammonium hydroxide gasifier 64, and the gas vent of ammonium hydroxide gasifier 64 is connected with ammonia-air mixture
Pipeline 65, ammonia-air mixture pipeline 65 gas vent are located in SCR denitration reaction device gas approach 4.
Specifically, the arrival end of air hose 61 is connected with air preheater 7, and it is cold to connect the part boiler drawn in air preheater 7
First air and/or cold Secondary Air, wherein the cold First air of part boiler and/or cold Secondary Air account for the 0.5~5% of total blast volume simultaneously
And pressure is 2~15kP, temperature is 0~50 DEG C.The outlet end of air hose 61 and setting are in SCR denitration reaction device gas approach 4
Air-flue gas pipe heat exchanger 62 be connected, and then the cold First air of part boiler and/or cold Secondary Air are sent into air-flue gas
It exchanges heat in pipe heat exchanger 62 with boiler smoke 1.
Air-flue gas pipe heat exchanger 62 is arranged in SCR denitration reaction device gas approach 4, air-flue gas pipe type heat transfer
Device 62 can specifically use heat exchanger tube structure, the high-temperature boiler flue gas flowed through from air -62 surface of flue gas pipe heat exchanger with
The cold First air of part boiler flowed through in air-flue gas pipe heat exchanger 62 and/or cold Secondary Air exchange heat, to realize
Heating to the cold First air of part boiler and/or cold Secondary Air.Specifically, 280~450 DEG C of boiler smoke 2 and part boiler
Cold First air and/or the heat exchange of cold Secondary Air, obtain 150~350 DEG C of hot-air.Preferably, setting adjusts control on air hose 61
Valve 611 can specifically adjust hot-air and subsequent ammonia-air mixing by adjusting the aperture of the adjusting control valve 611
The temperature of object.
Wherein, influence of air-flue gas pipe heat exchanger 62 arrangement to boiler is small or even substantially negligible, such as 300MW
The SCR equipment for denitrifying flue gas of grade, air-flue gas pipe heat exchanger 62 arrangement is no more than 3 DEG C to the smoke temperature drop in region, right
The influence of boiler is almost negligible.
Air-flue gas pipe heat exchanger 62 is connected by hot-air duct 63 with ammonium hydroxide gasifier 64, and warm-air pipe is passed through
150~350 DEG C of the hot-air is sent into ammonium hydroxide gasifier 64 and carries out heating and gasifying to denitrating catalyst ammonium hydroxide by road 63.
Ammonia atomization spray gun 641 is preferably provided in ammonium hydroxide gasifier 61, ammonia atomization spray gun 641, which connects, draws ammonium hydroxide, should
Ammonium hydroxide 2 is atomized into tiny drop by ammonia atomization spray gun 641, and subsequent drop is added by the hot-air introduced by hot-air duct 63
Heat resolves into ammonia and forms ammonia-air mixture with air.
The gas vent of ammonium hydroxide gasifier 61 is connected with ammonia-air mixture pipeline 65 and ammonia-air mixture
The gas vent of pipeline 65 is located in SCR denitration reaction device gas approach 4, will from there through ammonia-air mixture pipeline 65
Ammonia-air mixture is sent into SCR denitration reaction device gas approach 4 and carries out subsequent denitration process.
Preferably, ammonium hydroxide gasification injection unit 6 further includes that ammonia-air mixture pipeline 65 gas outlet is arranged in
Ammonia injection grid 66.It is changed it is highly preferred that the ammonia injection grid 66 is arranged in boiler economizer 3 with air-flue gas tubular type
Between hot device 62, air-flue gas pipe heat exchanger doubles as rectification function, and ammonia-air mixture can be improved and mix with flue gas
Uniformity is conducive to improve SCR denitration efficiency.The ammonia injection grid 66 can be more uniformly by ammonia-air mixture point
It is dispersed in SCR denitration reaction device gas approach 4, is conducive to ammonia-air mixture and is mixed with the uniform of boiler smoke.
Preferably, it is provided with temperature monitor 651 on ammonia-air mixture pipeline 65, it is mixed for detecting ammonia-air
Close the temperature of object.Specifically, can be believed according to the detection for the temperature monitor 651 being arranged on ammonia-air mixture pipeline 65
Number feedback, adjusts the aperture of adjusting control valve 611 being arranged on air hose 61, ammonia-air mixture temperature is made to be maintained at 150 DEG C
More than.
Flue gas 1 from boiler mixes after economizer 3 with the ammonia-air injected by ammonium hydroxide gasification injection unit 6
Ammonia-smoke mixture is formed with flue gas 1 after object, then passes through the combing of air-flue gas pipe heat exchanger 62, rectification, ammonia
It is uniformly mixed with flue gas, then passes through the entrance SCR denitration reaction device 5 of SCR denitration reaction device gas approach 4, in ammonia and flue gas
NOx occurs chemical reaction and generates harmless N2Reach denitration purpose with water.
The utility model is described in further detail with comparative example combined with specific embodiments below.
Embodiment:
The present embodiment uses the above method and device.
Specifically, the exhaust gas volumn of 300MW coal-burning boiler is 1063617Nm3/ h, NOx concentration therein are 250mg/Nm3
(6%O, doing), design denitration efficiency are 80%.
Economizer exit flue-gas temperature is 384 DEG C, is drawn using air hose from air preheater to air-flue gas pipe heat exchanger
Enter wind pressure be 10kPa, air quantity 4700Nm3The cold First air (it accounts for the 2.2% of the total cold First air of boiler) of/h, by sky
After the heat exchange of gas-flue gas pipe heat exchanger, cold First air is heated to form 350 DEG C of hot-air and is sent into ammonia by hot-air duct
In water device, ammonium hydroxide gasifier sprays into 20% ammonium hydroxide 425kg/h by ammonia atomization spray gun, and formation temperature is 155 DEG C
Ammonia-air mixture, then be sent into SCR denitration reaction device gas approach by ammonia-air mixture pipeline and mixed with flue gas
Denitration is realized after conjunction, wherein smoke temperature drop is 2.5 DEG C.
Boiler fired coal only increases 40kg/h on the basis of 110t/h, influences can be ignored on boiler, and denitration runnability
Parameter specifically: denitration efficiency 83.6%, SO2/SO3Conversion ratio is 0.4%, the escaping of ammonia 1.2mg/Nm3。
It can thus be seen that use the utility model using ammonium hydroxide as the SCR denitration method for flue gas and dress of denitrification reducing agent
It sets, rotary regenerative air preheater boiler smoke can not only be well solved using ammonium hydroxide as the SCR denitrating flue gas problem of reducing agent,
Method compared with the existing technology can also preferably promote SCR denitration performance, and more energy saving.
The utility model is not limited to specific embodiment above-mentioned.The utility model expands to any in this specification
The new feature of middle disclosure or any new combination, and disclose any new method or process the step of or any new group
It closes.
Claims (6)
1. a kind of using ammonium hydroxide as the SCR equipment for denitrifying flue gas of reducing agent, which is characterized in that described device includes ammonium hydroxide gasification injection
Unit, SCR denitration reaction device gas approach, SCR denitration reaction device and air preheater, SCR denitration reaction device gas approach position
Between boiler economizer and SCR denitration reaction device, the outlet of SCR denitration reaction device is arranged in air preheater；
Wherein, ammonium hydroxide gasification injection unit include air hose, air-flue gas pipe heat exchanger, hot-air duct, ammonium hydroxide gasifier and
Ammonia-air mixture pipeline, air-flue gas pipe heat exchanger are arranged in SCR denitration reaction device gas approach, air-cigarette
The gas access of air-tube type heat exchanger is connect by air hose with air preheater and the gas of gas vent and ammonium hydroxide gasifier enters
Mouth connection, the gas vent of ammonium hydroxide gasifier are connected with ammonia-air mixture pipeline, ammonia-air mixture pipeline gas
Body outlet is located in the SCR denitration reaction device gas approach.
2. according to claim 1 using ammonium hydroxide as the SCR equipment for denitrifying flue gas of reducing agent, which is characterized in that the ammonium hydroxide gas
Changing injection unit further includes the ammonia injection grid that ammonia-air mixture pipeline gas outlet is arranged in.
3. according to claim 2 using ammonium hydroxide as the SCR equipment for denitrifying flue gas of reducing agent, which is characterized in that the ammonia note
Grid is penetrated to be arranged between boiler economizer and air-flue gas pipe heat exchanger.
4. according to claim 1 using ammonium hydroxide as the SCR equipment for denitrifying flue gas of reducing agent, which is characterized in that on the air hose
Adjusting control valve is set, is provided with temperature monitor on the ammonia-air mixture pipeline.
5. according to claim 1 using ammonium hydroxide as the SCR equipment for denitrifying flue gas of reducing agent, which is characterized in that the ammonium hydroxide gas
Change in device and be provided with ammonia atomization spray gun, the ammonia atomization spray gun, which connects, draws ammonium hydroxide.
6. according to claim 1 using ammonium hydroxide as the SCR equipment for denitrifying flue gas of reducing agent, which is characterized in that the air hose connects
Draw the cold First air of part boiler and/or the cold Secondary Air in air preheater, wherein the cold First air of the part boiler and/or
Cold Secondary Air accounts for the 0.5~5% of total blast volume and pressure is 2~15kP, temperature is 0~50 DEG C.
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| CN201820731229.6U CN208449061U (en) | 2018-05-16 | 2018-05-16 | It is a kind of using ammonium hydroxide as the SCR equipment for denitrifying flue gas of reducing agent |
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| CN201820731229.6U CN208449061U (en) | 2018-05-16 | 2018-05-16 | It is a kind of using ammonium hydroxide as the SCR equipment for denitrifying flue gas of reducing agent |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108452677A (en) * | 2018-05-16 | 2018-08-28 | 东方电气集团东方锅炉股份有限公司 | It is a kind of using ammonium hydroxide as the SCR denitration method for flue gas and device of denitrification reducing agent |
| CN111871194A (en) * | 2020-07-27 | 2020-11-03 | 重庆鲍斯净化设备科技有限公司 | High concentration nitrogen oxide tail gas treatment system |
-
2018
- 2018-05-16 CN CN201820731229.6U patent/CN208449061U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108452677A (en) * | 2018-05-16 | 2018-08-28 | 东方电气集团东方锅炉股份有限公司 | It is a kind of using ammonium hydroxide as the SCR denitration method for flue gas and device of denitrification reducing agent |
| CN111871194A (en) * | 2020-07-27 | 2020-11-03 | 重庆鲍斯净化设备科技有限公司 | High concentration nitrogen oxide tail gas treatment system |
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