CN206965521U - A kind of denitrification apparatus quoted high-temperature flue gas and carry out urea pyrolysis ammonia - Google Patents
A kind of denitrification apparatus quoted high-temperature flue gas and carry out urea pyrolysis ammonia Download PDFInfo
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- CN206965521U CN206965521U CN201720919566.3U CN201720919566U CN206965521U CN 206965521 U CN206965521 U CN 206965521U CN 201720919566 U CN201720919566 U CN 201720919566U CN 206965521 U CN206965521 U CN 206965521U
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- pyrolysis
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The utility model discloses a kind of denitrification apparatus quoted high-temperature flue gas and carry out urea pyrolysis ammonia, including：Boiler back end ductwork, some pyrolysis apparatus, a blender, a reactor；Pyrolysis apparatus is provided with pyrolysis apparatus import and pyrolysis apparatus exports, pyrolysis apparatus inlet communication boiler back end ductwork high-temperature region, pyrolysis apparatus outlet connection boiler back end ductwork low-temperature space, pyrolysis apparatus import is provided with inlet flue gas baffle plate, pyrolysis apparatus outlet is provided with flue-gas temperature detection means, flue gas pressures detection means, and some urea spray guns are provided with pyrolysis apparatus and spray vaporific urea liquid；Boiler back end ductwork end connects blender, blender coupled reaction device.Beneficial effect：Urea is pyrolyzed in pyrolysis apparatus using high warm flue gas, is heated without extra electric heater and steam, saves energy expenditure, reduce cost, and urea pyrolysis can be made abundant, prevent urea from being crystallized on catalyst and air preheater, prevent boiler back end ductwork heating surface and heat-transfer surface from being corroded by urea.
Description
Technical field
Flue gases purification field is the utility model is related to, quoting high-temperature flue gas more particularly, to one kind carries out urea pyrolysis
The denitrification apparatus of ammonia processed.
Background technology
Coal-burning boiler is the important means of China's production of energy, along with the national economic development, energy resource consumption cumulative year after year,
Incident atmosphere polluting problem highlights and turns into focus of concern gradually.Wherein nitrogen oxides (NOx) is big as three
One of Air Pollutants, receive more and more attention, denitrating flue gas has turned into the major fields of national contamination control.
At present, in China, practical application reduces (SCR) skill in the main selective catalysis of gas denitrifying technology of power plant
The GC-MS of art, SNCR (SNCR) technology and SCR-SNCR.At this
In three kinds of gas denitrifying technologies SCR (SCR) technology with denitration efficiency is high, the good, stable and reliable operation of selectivity,
Almost the advantages that non-secondary pollution, turn into the denitration technology being most widely used.
The reducing agent of SCR denitration technique mainly has liquefied ammonia, ammoniacal liquor, three kinds of urea, and three respectively has advantage and disadvantage.Liquefied ammonia and ammoniacal liquor
With corrosivity, potential safety hazard be present in links such as transport, discharging, storage, operation, maintenance, its safety used etc.
Level requires higher, and initial outlay cost is higher.Using the SCR denitration technique that urea is reducing agent because being required without safe class, urine
The advantages that element storage and convenient transportation and few initial outlay cost, more concentrated, close to city in middle-size and small-size power plant and some populations
The large power plant in area is used widely.
In the world, the SCR denitration technique using urea as reducing agent is mainly：Pyrolysis and hydrolysis.Urea pyrolysis method is
The urea liquid of 50% mass concentration is injected in urea pyrolysis stove by spray gun, urea is then made using electrically heated mode
Solution is completed to resolve into ammonia and carbon dioxide.Gas after decomposition is sent to the ammonia-spraying grid of SCR system.Hydrolysis of urea technique
Principle is mainly that urea liquid is decomposed reaction at high temperature under high pressure, usually inputs urea liquid to hydrolysis reactor
(being similar to heat exchanger), is heated to urea liquid by steam pipe coil, is typically heated to 180 degree or so in the reactor,
Urea liquid, which is decomposed, discharges ammonia and carbon dioxide.The patented technology of external pyrolysis and hydrolysis is required for individually at present
System produces ammonia, and is required for consuming a large amount of thermals source, and energy consumption is higher, and operating cost is higher, restricts to a certain extent
The engineer applied of urea pyrolysis and technology for hydrolyzing.
At home, in order to reduce energy consumption, operating cost is reduced, many denitrating techniques use urea direct injection technology.Urea is straight
Spray technique is that the urea liquid after dilution is sprayed into boiler back end ductwork by spray gun, and urea back-end ductwork in boiler is completed to divide
The process of solution.Urea direct injection technology also has the shortcomings that larger：Influenceed by boiler tail insufficient space, urea does not divide also completely
Solution has just been sprayed onto on boiler heating surface, and the time has grown urea droplets can cause corrosion etc. to influence on heating surface；Inside flue
Heated and heat transmission equipment influences, and urea direct-injection to boiler back end ductwork, can not uniformly be mixed with flue gas, and urea in flue not
It can completely decompose, easily be crystallized on catalyst and air preheater, cause catalyst, air preheater blocks and catalyst failure.
Utility model content
The purpose of this utility model is to overcome above-mentioned technical deficiency, a kind of reference high-temperature flue gas progress urea pyrolysis of proposition
The denitrification apparatus of ammonia processed, solves above-mentioned technical problem of the prior art.
To reach above-mentioned technical purpose, the technical solution of the utility model provides a kind of high-temperature flue gas of quoting and carries out urea heat
The denitrification apparatus of solution ammonia, including：Boiler back end ductwork, some pyrolysis apparatus, a blender, a reactor；Pyrolysis apparatus is provided with heat
Solve device import and pyrolysis apparatus outlet, pyrolysis apparatus inlet communication boiler back end ductwork high-temperature region, pyrolysis apparatus outlet connection boiler tail
Flue low-temperature space, pyrolysis apparatus import are provided with inlet flue gas baffle plate, and pyrolysis apparatus outlet is provided with flue-gas temperature detection means, flue gas
Pressure-detecting device；Boiler back end ductwork end connects blender, blender coupled reaction device.
Compared with prior art, the beneficial effects of the utility model include：It is pyrolyzed using high warm flue gas in pyrolysis apparatus
Urea, while identical denitration effect is reached, heated without extra electric heater and steam, farthest save energy
Amount consumption, reduces operating cost, and urea pyrolysis can be made abundant, prevents that urea is insufficient pre- in catalyst and air due to being pyrolyzed
Crystallized on hot device, prevent from by urea being corroded using boiler back end ductwork heating surface and heat-transfer surface caused by urea direct injection technology；Urine
Gas and boiler back end ductwork flue gas can be sufficiently mixed in a mixer caused by element pyrolysis, can lift reduction in the reactor
Reaction effect.
Brief description of the drawings
Fig. 1 is a kind of denitrification apparatus structure quoted high-temperature flue gas and carry out urea pyrolysis ammonia provided by the utility model
Figure.
In accompanying drawing：1st, boiler back end ductwork, 2, pyrolysis apparatus, 3, blender, 4, reactor, 21, pyrolysis apparatus import, 22, heat
Solve device outlet, 23, urea spray gun, 24, inlet flue gas baffle plate, 25, flue-gas temperature detection means, 26, flue gas pressures detection means.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining
The utility model, it is not used to limit the utility model.
The utility model provides a kind of denitrification apparatus quoted high-temperature flue gas and carry out urea pyrolysis ammonia, including：Boiler
Back-end ductwork 1, some pyrolysis apparatus 2, a blender 3, a reactor 4；Pyrolysis apparatus 2 is equipped with pyrolysis apparatus import 21 and pyrolysis apparatus goes out
Mouth 22, pyrolysis apparatus import 21 connect the high-temperature region of boiler back end ductwork 1, and it is low that pyrolysis apparatus outlet 22 is all connected with boiler back end ductwork 1
Warm area；The end of boiler back end ductwork 1 connects blender 3, the coupled reaction device 4 of blender 3；Set on the top of pyrolysis apparatus 2 or side
There are some urea spray guns 23, the shower nozzle of urea spray gun 23 is stretched into inside pyrolysis apparatus 2, and compressed air is introduced in urea spray gun 23, by
Cause shape of the urea liquid from the shower nozzle of urea spray gun 23 to be atomized in urea spray gun 23 in the pressure brought of compressed air
Formula is sprayed onto inside pyrolysis apparatus 2.
In above-mentioned technical proposal, as shown in figure 1, boiler back end ductwork 1 is transitioned into low-temperature space, pot for high-temperature region from top to bottom
There is high warm flue gas in stove back-end ductwork 1, boiler high temperature heat smoke contains NOx (nitrogen oxides), inside boiler back end ductwork 1
High warm flue gas flows to low-temperature space from high-temperature region；High warm flue gas (550~700 DEG C) enters pyrolysis apparatus 2 from pyrolysis apparatus import 21
And it is pyrolyzed in pyrolysis apparatus 2 from the outflow of pyrolysis apparatus outlet 22, atomization urea liquid, is completely decomposed into ammonia and carbon dioxide, contains
There is the gas in the pyrolysis apparatus 2 of ammonia to reach the low-temperature space of boiler back end ductwork 1 after the outflow of pyrolysis apparatus outlet 22 and in boiler tail
The flue gas of the low-temperature space of portion's flue 1 and boiler back end ductwork 1 is crossed；Afterwards, the gas in pyrolysis apparatus 2, boiler back end ductwork 1
Flue gas be sufficiently mixed into blender 3, mixed gas is formed after mixing；Mixed gas enters back into be connected with blender 3
Reactor 4, the NOx of mixed gas, ammonia issue raw reduction reaction in catalyst action, generate N2 and H2O, reach smoke abatement
The purpose of nitrogen oxides in gas.
In above-mentioned technical proposal, the inside of pyrolysis apparatus 2 sets abrasionproof and diversion component, is often mingled with some in boiler smoke
Particulate matter, abrasionproof part is set inside pyrolysis apparatus 2, such as scuff-resistant coating is set inside pyrolysis apparatus 2, flue gas can be prevented
Cause to scratch inside granular substance confrontation pyrolysis apparatus 2, damage, extend the service life of pyrolysis apparatus 2；Set and lead inside pyrolysis apparatus 2
Stream unit, such as corner's setting deflector or flow deflector inside pyrolysis apparatus 2 so that the turning inside pyrolysis apparatus 2 becomes
It is round and smooth, improve the fluency of the gas flowing inside pyrolysis apparatus 2.
In above-mentioned technical proposal, caused gas is mixed in blender 3 after boiler smoke and urea liquid pyrolysis, can
Choosing, blender 3 be s type passages, can increase the incorporation time of gas, makes boiler smoke and urea liquid caused after being pyrolyzed
Gas mixing is more abundant；Mixed gas from blender 3 out enters reactor 4 and passes through reactive multilayer layer, conversion zone
In be provided with catalyst, mixed gas issues raw reduction reaction in catalyst action, generates N2 and H2O, reaches and removes nitrogen in flue gas
The purpose of oxide.
In above-mentioned technical proposal, pyrolysis apparatus import 21 is provided with inlet flue gas baffle plate 24, and inlet flue gas baffle plate 24 is to open
The automatically controlled baffle plate closed, inlet flue gas baffle plate 24 are used to adjust the amount into the high-temperature flue gas of pyrolysis apparatus 2.
In above-mentioned technical proposal, pyrolysis apparatus outlet 22 is provided with flue-gas temperature detection means 25, flue gas pressures detection means
26, it is preferred that pyrolysis apparatus outlet 22 also sets up a flow sensor, flue-gas temperature detection means 25, flue gas pressures detection means
26th, flow sensor is respectively used to temperature, pressure, flow of the detection from the discharge gas of pyrolysis apparatus outlet 22.
Compared with prior art, the beneficial effects of the utility model include：It is pyrolyzed using high warm flue gas in pyrolysis apparatus
Urea, while identical denitration effect is reached, heated without extra electric heater and steam, farthest save energy
Amount consumption, reduces operating cost, and urea pyrolysis can be made abundant, prevents that urea is insufficient pre- in catalyst and air due to being pyrolyzed
Crystallized on hot device, prevent from by urea being corroded using boiler back end ductwork heating surface and heat-transfer surface caused by urea direct injection technology；Urine
Gas and boiler back end ductwork flue gas can be sufficiently mixed in a mixer caused by element pyrolysis, can lift reduction in the reactor
Reaction effect.
Specific embodiment of the present utility model described above, the restriction to scope of protection of the utility model is not formed.
Any various other corresponding changes and deformation made according to technical concept of the present utility model, should be included in this practicality
In new scope of the claims.
Claims (5)
- A kind of 1. denitrification apparatus quoted high-temperature flue gas and carry out urea pyrolysis ammonia, it is characterised in that including：Boiler tail cigarette Road, some pyrolysis apparatus, a blender, a reactor；The pyrolysis apparatus is provided with pyrolysis apparatus import and pyrolysis apparatus exports, the pyrolysis Device inlet communication boiler back end ductwork high-temperature region, the pyrolysis apparatus outlet connection boiler back end ductwork low-temperature space, the pyrolysis apparatus Import is provided with inlet flue gas baffle plate, and the pyrolysis apparatus outlet is provided with flue-gas temperature detection means, flue gas pressures detection means； Some urea spray guns are provided with the pyrolysis apparatus, the shower nozzle of the urea spray gun is stretched into inside the pyrolysis apparatus, the urea Spray gun is to the urea liquid that atomization is sprayed inside the pyrolysis apparatus；The boiler back end ductwork end connects the blender, institute State blender and connect the reactor.
- 2. the denitrification apparatus that high-temperature flue gas carries out urea pyrolysis ammonia is quoted as claimed in claim 1, it is characterised in that described Urea spray gun is arranged on top surface or the side of the pyrolysis apparatus.
- 3. the denitrification apparatus that high-temperature flue gas carries out urea pyrolysis ammonia is quoted as claimed in claim 1, it is characterised in that described Abrasionproof and diversion component are set inside pyrolysis apparatus.
- 4. the denitrification apparatus that high-temperature flue gas carries out urea pyrolysis ammonia is quoted as claimed in claim 1, it is characterised in that described Multiple conversion zones are provided with reactor, catalyst is provided with the conversion zone.
- 5. the denitrification apparatus that high-temperature flue gas carries out urea pyrolysis ammonia is quoted as claimed in claim 1, it is characterised in that described Inlet flue gas baffle plate is retractable automatically controlled baffle plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720919566.3U CN206965521U (en) | 2017-07-27 | 2017-07-27 | A kind of denitrification apparatus quoted high-temperature flue gas and carry out urea pyrolysis ammonia |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720919566.3U CN206965521U (en) | 2017-07-27 | 2017-07-27 | A kind of denitrification apparatus quoted high-temperature flue gas and carry out urea pyrolysis ammonia |
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| CN206965521U true CN206965521U (en) | 2018-02-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107261837A (en) * | 2017-07-27 | 2017-10-20 | 中节环立为（武汉）能源技术有限公司 | It is a kind of to quote denitrification apparatus and technique that high-temperature flue gas carries out urea pyrolysis ammonia |
| CN109999661A (en) * | 2019-04-22 | 2019-07-12 | 山西华仁通电力科技有限公司 | A kind of gas-turbine waste heat boiler denitrating system and its course of work |
| CN108671675B (en) * | 2018-05-23 | 2021-01-12 | 彩虹集团有限公司 | Flue gas treatment system and process for TFT (thin film transistor) kiln glass kiln |
-
2017
- 2017-07-27 CN CN201720919566.3U patent/CN206965521U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107261837A (en) * | 2017-07-27 | 2017-10-20 | 中节环立为（武汉）能源技术有限公司 | It is a kind of to quote denitrification apparatus and technique that high-temperature flue gas carries out urea pyrolysis ammonia |
| CN108671675B (en) * | 2018-05-23 | 2021-01-12 | 彩虹集团有限公司 | Flue gas treatment system and process for TFT (thin film transistor) kiln glass kiln |
| CN109999661A (en) * | 2019-04-22 | 2019-07-12 | 山西华仁通电力科技有限公司 | A kind of gas-turbine waste heat boiler denitrating system and its course of work |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190429 Address after: 430000 No. 77 Guanggu Avenue, Donghu Development Zone, Wuhan City, Hubei Province, Financial Background Service Center Base Phase II, Building B22, No. 7, Level 1 Patentee after: Wuhan Construction Engineering Co., Ltd. Address before: 430061 Guanggu Financial Background Service Center Base, 77 Guanggu Avenue, Donghu Development Zone, Wuhan City, Hubei Province Patentee before: China (Wuhan) Energy Technology Co., Ltd. |
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| TR01 | Transfer of patent right |