CN207680375U - A kind of fluidized bed furnace flue gas denitrification system - Google Patents

A kind of fluidized bed furnace flue gas denitrification system Download PDF

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Publication number
CN207680375U
CN207680375U CN201721775029.2U CN201721775029U CN207680375U CN 207680375 U CN207680375 U CN 207680375U CN 201721775029 U CN201721775029 U CN 201721775029U CN 207680375 U CN207680375 U CN 207680375U
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fluidized bed
bed furnace
flue gas
scr reactors
communicated
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陈晶
张�杰
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BEIJING AVIC TIANYE TECHNOLOGY Co Ltd
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BEIJING AVIC TIANYE TECHNOLOGY Co Ltd
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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
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Abstract

The utility model discloses a kind of fluidized bed furnace flue gas denitrification systems, the holder of SCR reactors and fluidized bed furnace is respectively equipped with including both ends, SCR reactors have air inlet pipe close to the side of fluidized bed furnace is co-walled, snorkel is communicated between air inlet pipe and fluidized bed furnace, snorkel is equipped with multiple spray guns being connected to snorkel inside, and the other end of spray gun is communicated with urea solution metering distribution system；Multi-layer catalyst is equipped in SCR reactors, the top of SCR reactors is equipped with air-flow even distributor and is communicated with calotte, and calotte is connected with air inlet pipe；The bottom of SCR reactors is communicated with exhaust pipe；Deflector is equipped in calotte.The denitration of boiling kiln gas is realized, denitration effect is good, efficient；The equipment such as urea pyrolysis stove are eliminated, floor space is small, and cost of investment and operation energy consumption are low；Reactor body and the co-walled setting of air inlet pipe, save the quantity of material and expansion joint, reduce manufacturing cost；The uniformly distributed property of flue gas is good, and velocity deviation is small, is conducive to the treatment effect for improving flue gas.

Description

A kind of fluidized bed furnace flue gas denitrification system
Technical field
The utility model is related to flue gases purification field more particularly to a kind of fluidized bed furnace flue gas denitrification systems.
Background technology
In recent years, the concern with country to air quality proposes quite stringent pollutant for power industry and arranges Put limit value, correspondingly, country has also put into effect discharge standard about industrial furnace smoke pollutant, some standards even directly with Power plant emission standard is consistent, currently, power industry denitrating technique mainly uses SCR (selective catalytic reduction) or SNCR (choosings Selecting property non-catalytic reduction) technique.
Fluidized bed furnace in Industrial Stoves for raw materials for production calcining, the flue gas that fuel generates after stove chamber inner combustion are directly arranged Go out and be used for material drying, there is no the heat exchange cooling system such as economizer, air preheater after stove, flue-gas temperature is higher, is generally capable of up to 600-900℃.Under worst hot case, the generation concentration of nitrogen oxides is higher, according to selective non-catalytic reduction (SNCR) work Skill, one side fume treatment efficiency are difficult to up to standard, and on the other hand higher ammonia slip concentration will produce bad shadow to backend process It rings.Therefore selective catalytic reduction (SCR) technique is mostly used.
Urea is a kind of safe and efficient denitrification reducing agent, still, needs to consume a large amount of energy using urea ammonia, And investment and run a set of urea pyrolysis or hydrolysis system cost is higher.For this case, one efficient process of research and development need to be designed The flue gas denitrification system of fluidized bed furnace high-temperature flue gas and economy.
Utility model content
The purpose of this utility model is to provide a kind of fluidized bed furnace flue gas denitrification systems, and it is high to reach efficient process fluidized bed furnace Warm flue gas and the purpose for reducing cost.
In order to solve the above technical problems, the technical solution of the utility model is：A kind of fluidized bed furnace flue gas denitrification system, packet Holder is included, the both ends of the holder are respectively equipped with SCR reactors and fluidized bed furnace, and the SCR reactors are close to the fluidized bed furnace Side is co-walled to be provided with air inlet pipe, snorkel is communicated between the air inlet pipe and the fluidized bed furnace, the snorkel is equipped with The other end of multiple spray guns extended in the snorkel, the spray gun is communicated with urea solution metering distribution system；
It is equipped on multi-layer catalyst, with the SCR reactors of the catalyst corresponding position and cuts with scissors in the SCR reactors It is connected to door-plate；The top of the SCR reactors is equipped with air-flow even distributor；
Calotte, the calotte one end and air inlet pipe far from the SCR reactors are communicated at the top of the SCR reactors Connection；The bottom of the SCR reactors is communicated with exhaust pipe；
The calotte is equipped with deflector close to one end of the air inlet pipe.
As an improvement being equipped with cold wind between the air inlet pipe and the snorkel is sent into pipe, the cold wind is sent into pipe Expansion joint is equipped between the air inlet pipe.
As an improvement the air-flow even distributor includes the plate body for being set to the SCR reactor heads, the plate body Multiple stomatas are equipped with, the stomata is connected to the inside of the SCR reactors and the calotte.
As a further improvement, the urea solution metering distribution system includes urea solution preparing device, the urine Plain solution-preparation device is communicated with urea solution metering assembly by urea liquid delivery pipe, is set in the urea liquid delivery pipe There is delivery pump；
Blowpipe and First air delivery pipe are communicated on the urea solution metering assembly, the First air is defeated Pipe is sent to be connected with wind turbine；The spray gun is connected to the urea solution metering assembly；
Demineralized water delivery pipe is also communicated on the urea solution preparing device.
As a further improvement, the deflector is the tablet being obliquely installed, the deflector is equipped with polylith and every The angle of inclination of deflector described in block is different.
As a further improvement, the calotte is equipped with the rake being correspondingly arranged with the air-flow even distributor.
As further improvement, the angle of inclination of the rake with respect to the horizontal plane is 25-35 degree.
As a further improvement, catalyst described in the multilayer is set along the short transverse array of the SCR reactors It sets.
By adopting the above-described technical solution, a kind of fluidized bed furnace flue gas denitrification system provided by the utility model has Beneficial effect is as follows：
Since the fluidized bed furnace flue gas denitrification system includes holder, the both ends of holder are respectively equipped with SCR reactors and boiling Stove, SCR reactors are provided with air inlet pipe close to the side of fluidized bed furnace is co-walled, snorkel are communicated between air inlet pipe and fluidized bed furnace, Snorkel is equipped with multiple spray guns extended in snorkel, and the other end of spray gun is communicated with urea solution metering distribution system； It is equipped in SCR reactors on multi-layer catalyst, with the SCR reactors of catalyst corresponding position and is hinged with door-plate；SCR reactors Top is equipped with air-flow even distributor；Calotte, calotte one end and air inlet pipe far from SCR reactors are communicated at the top of SCR reactors Connection；The bottom of SCR reactors is communicated with exhaust pipe；Calotte is equipped with deflector close to one end of air inlet pipe, is based on above structure, At work with flue gas denitrification system, the high-temperature flue gas that fluidized bed furnace generates enters snorkel to the fluidized bed furnace, and spray gun is by urea later The urea liquid that the conveying of solution measures distribution system comes sprays into snorkel, and the heat source of urea pyrolysis is used as by high-temperature flue gas (i.e.：Snorkel is instead of traditional urea pyrolysis stove and ammonia-spraying grid), to complete urea pyrolysis and gas ammonia mixing；Flue gas later Air inlet pipe and calotte are sequentially entered, flue gas is uniformly sent to by air-flow even distributor by deflector later, flue gas passes through gas later Stream uniform device enters in SCR reactors, and later under the catalytic action of catalyst, the nitrogen oxides in flue gas is reduced to nitrogen Gas and water, introduce aftertreatment systems by exhaust pipe later.
In above process, air inlet pipe and the co-walled setting of reactor body, can carry out adequately heat transmit, the two it is swollen Swollen coefficient is identical with swell increment, it is not necessary that expansion joint is arranged between air inlet pipe and calotte；The cooperation of deflector and air-flow even distributor, Ensure to be uniformly distributed before temperature, flow velocity and the gas ammonia of flue gas are distributed in arrival top layer catalyst, cause to avoid being unevenly distributed Denitration efficiency reduces；Support by holder to above-mentioned all parts, compared with tradition, support effect is good, manufacturing cost is low, together When, due to reactor body and the co-walled setting of air inlet pipe, the structure (structure setting is on holder) of fixed air inlet pipe is saved, The height that holder can be substantially reduced, is effectively saved installation cost.
In conclusion using the fluidized bed furnace flue gas denitrification system, have the advantage that：
1, the operating condition of fluidized bed furnace complexity is can adapt to, realizes denitrating flue gas, and denitrating flue gas effect is good, denitration efficiency Height, having reached that treated, flue gas meets discharge standard；
2, compared with tradition, the equipment such as urea pyrolysis stove are eliminated, floor space is small, and cost of investment is low, meanwhile, it drops significantly Low operation energy consumption；
3, reactor body and the co-walled setting of air inlet pipe, save the material of manufacture air inlet pipe, while reducing expansion joint Setting quantity, reduce manufacturing cost；
4, the uniformly distributed property of flue gas is good, and velocity deviation is small, is conducive to the treatment effect for improving flue gas；
5, easy to operate, maintenance maintenance is conveniently.
It is sent into pipe due to being equipped with cold wind between air inlet pipe and snorkel, cold wind, which is sent between pipe and air inlet pipe, is equipped with expansion Section uniformly mixes to be sent into the cold air that pipe is sent by cold wind with the high-temperature flue gas that pipe is sent into is sent into, to reach reduction high temperature The purpose of flue-gas temperature, to realize that the flue-gas temperature entered in SCR reactors meets the temperature window of catalyst reaction；In the mistake Cheng Zhong impacts equipment to avoid flue from vibrating and thermally expand by expansion joint.
Since air-flow even distributor includes the plate body being set at the top of reactor body, plate body is equipped with multiple stomatas, stomata It is connected to the inside of reactor body and calotte, simple in structure, convenient processing and manufacture, is dropped before reaching top layer catalyst for flue gas Low flow velocity deviation is laid a good foundation.
Since urea solution metering distribution system includes urea solution preparing device, urea solution preparing device passes through urea Solution conveyor tube is communicated with urea solution metering assembly, and urea liquid delivery pipe is equipped with delivery pump, spray gun and urea liquid meter Assembly connection is measured, at work, urea liquid prepared by urea solution preparing device passes through urea liquid delivery pipe and defeated Urea liquid is delivered to urea solution metering assembly, injects urea solution into snorkel by spray gun later by the cooperation for sending pump It is interior, it is simple in structure, it is good to the conveying effect of urea liquid, to save urea pyrolysis stove and not influencing the gas ammonia with high-temperature flue gas Mixing provides guarantee.
Due to being communicated with blowpipe and First air delivery pipe, First air delivery pipe on urea solution metering assembly It is connected with wind turbine, to reduce spray gun temperature, prevents spray gun from being blocked by the dust in flue gas；It is conveyed by blowpipe Compressed air, realize spray gun spray feed gas and liquid mixture, the mist droplet particle size for realizing ejection is small, ensure that urea is molten Liquid in snorkel decompose rapidly by gasification, effectively shortens the reaction time, improves pyrolysis efficiency；It is defeated by First air delivery pipe The First air sent to reduce the temperature of spray gun, and then substantially increases the service life of spray gun.
Due to being also communicated with demineralized water delivery pipe on urea solution preparing device, to be conveyed by demineralized water delivery pipe Demineralized water be rinsed avoid urea liquid delivery pipe crystallize and block.
Since deflector is the tablet being obliquely installed, deflector is equipped with polylith and the angle of inclination of every piece of deflector is different, To be oriented to, be disperseed to flue gas by the different deflector in angle of inclination, ensure flue gas before entering reactor body, Realization is uniformly distributed；Meanwhile being conducive to the uniform mixing of cold air and high-temperature flue gas.
It is logical to avoid flue gas by rake since calotte is equipped with the rake being correspondingly arranged with air-flow even distributor Cross into reactor body when, flue gas flow direction racing and lead to the problem of bias current and local turbulent.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the structural schematic diagram of air-flow even distributor in Fig. 1；
In figure, 1- holders；2-SCR reactors；201- air inlet pipe；202- catalyst；203- door-plates；204- airflow uniform distributions Device；2041- plate bodys；2042- stomatas；205- calottes；2051- rakes；206- exhaust pipes；207- deflectors；3- fluidized bed furnaces；4- Snorkel；401- spray guns；402- jet pipes；5- urea solution metering distribution systems；501- urea solution preparing devices；502- urea Solution conveyor tube；503- delivery pumps；504- blowpipes；505- First air delivery pipes；506- wind turbines；507- demineralized waters Delivery pipe；508- urea liquid branches；509- urea solution metering assemblies；6- cold wind is sent into pipe；601- expansion joints.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain The utility model is not used to limit the utility model.
As shown in Figure 1, a kind of fluidized bed furnace flue gas denitrification system, including holder 1, the both ends of the holder 1 are respectively equipped with SCR Reactor 2 and fluidized bed furnace 3, the SCR reactors 2 are provided with air inlet pipe 201 close to the side of fluidized bed furnace 3 is co-walled, the air inlet pipe 201 Snorkel 4 is communicated between fluidized bed furnace 3, which is equipped with multiple spray guns 401 extended in snorkel 4, the spray gun 401 other end is communicated with urea solution metering distribution system 5；Multi-layer catalyst 202 is equipped in the SCR reactors 2, multilayer is urged Agent 202 is arranged along the short transverse array of SCR reactors 2, is hinged with on the SCR reactors 2 of 202 corresponding position of catalyst Door-plate 203；The top of the SCR reactors 2 is equipped with air-flow even distributor 204；The top of the SCR reactors 2 is communicated with calotte 205, The one end of the calotte 205 far from SCR reactors 2 is connected to air inlet pipe 201；The bottom of the SCR reactors 2 is communicated with exhaust pipe 206；The calotte 205 is equipped with deflector 207 close to one end of air inlet pipe 201.
It is equipped with cold wind between the air inlet pipe 201 and snorkel 4 and is sent into pipe 6, which is sent into pipe 6 and air blower (in figure not Show) it is connected, which, which is sent between pipe 6 and air inlet pipe 201, is equipped with expansion joint 601.
The air-flow even distributor 204 includes the plate body 2041 for being set to 2 top of SCR reactors, which is equipped with more A stomata 2042 (referring to Fig. 2), the stomata 2042 are connected to the inside of SCR reactors 2 and calotte 205.
The urea solution metering distribution system 5 includes urea solution preparing device 501, the urea solution preparing device 501 It is communicated with urea solution metering assembly 509 by urea liquid delivery pipe 502, which is equipped with conveying Pump 503, is communicated with urea liquid branch 508, the urea liquid in the urea liquid delivery pipe 502 in 503 downstream of delivery pump Branch 508 is connected to urea solution preparing device 501；It is communicated with blowpipe on the urea solution metering assembly 509 504 and First air delivery pipe 505, the First air delivery pipe 505 be connected with wind turbine 506；The spray gun 401 passes through jet pipe 402 and urine Plain solution measures assembly 509 is connected to；It is also communicated with demineralized water delivery pipe 507 on the urea solution preparing device 501.
The deflector 207 is the tablet being obliquely installed, which is equipped with the inclination of polylith and every piece of deflector 207 Angle is different；The calotte 205 is equipped with the rake 2051 being correspondingly arranged with air-flow even distributor 204, and the rake 2051 is opposite In the angle of inclination of horizontal plane be 25-35 degree.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this All any modification, equivalent and improvement etc., should be included in the utility model made by within the spirit and principle of utility model Protection domain within.

Claims (8)

1. a kind of fluidized bed furnace flue gas denitrification system, including holder, which is characterized in that the both ends of the holder are respectively equipped with SCR Reactor and fluidized bed furnace, the SCR reactors are provided with air inlet pipe close to the side of the fluidized bed furnace is co-walled, the air inlet pipe with Snorkel is communicated between the fluidized bed furnace, the snorkel is equipped with multiple spray guns extended in the snorkel, described The other end of spray gun is communicated with urea solution metering distribution system；
It is equipped on multi-layer catalyst, with the SCR reactors of the catalyst corresponding position and is hinged in the SCR reactors Door-plate；The top of the SCR reactors is equipped with air-flow even distributor；
Calotte is communicated at the top of the SCR reactors, the one end of the calotte far from the SCR reactors connects with air inlet pipe It is logical；The bottom of the SCR reactors is communicated with exhaust pipe；
The calotte is equipped with deflector close to one end of the air inlet pipe.
2. fluidized bed furnace flue gas denitrification system according to claim 1, which is characterized in that the air inlet pipe is supplied gas with described It is equipped with cold wind between pipe and is sent into pipe, the cold wind, which is sent between pipe and the air inlet pipe, is equipped with expansion joint.
3. fluidized bed furnace flue gas denitrification system according to claim 1, which is characterized in that the air-flow even distributor includes setting Be placed in the plate body of the SCR reactor heads, the plate body is equipped with multiple stomatas, the stomata with the SCR reactors Inside be connected to the calotte.
4. fluidized bed furnace flue gas denitrification system according to any one of claims 1 to 3, which is characterized in that the urea is molten It includes urea solution preparing device that liquid, which measures distribution system, and the urea solution preparing device is connected to by urea liquid delivery pipe There are urea solution metering assembly, the urea liquid delivery pipe to be equipped with delivery pump；
Blowpipe and First air delivery pipe, the First air delivery pipe are communicated on the urea solution metering assembly It is connected with wind turbine；The spray gun is connected to the urea solution metering assembly；
Demineralized water delivery pipe is also communicated on the urea solution preparing device.
5. fluidized bed furnace flue gas denitrification system according to claim 4, which is characterized in that the deflector is to be obliquely installed Tablet, the deflector is equipped with polylith and the angle of inclination of every piece of deflector is different.
6. fluidized bed furnace flue gas denitrification system according to claim 4, which is characterized in that the calotte be equipped with it is described The rake that air-flow even distributor is correspondingly arranged.
7. fluidized bed furnace flue gas denitrification system according to claim 6, which is characterized in that the rake is relative to level The angle of inclination in face is 25-35 degree.
8. fluidized bed furnace flue gas denitrification system according to claim 4, which is characterized in that catalyst edge described in the multilayer The short transverse array of the SCR reactors is arranged.
CN201721775029.2U 2017-12-18 2017-12-18 A kind of fluidized bed furnace flue gas denitrification system Active CN207680375U (en)

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CN201721775029.2U CN207680375U (en) 2017-12-18 2017-12-18 A kind of fluidized bed furnace flue gas denitrification system

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Application Number Priority Date Filing Date Title
CN201721775029.2U CN207680375U (en) 2017-12-18 2017-12-18 A kind of fluidized bed furnace flue gas denitrification system

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