CN203525567U - SCR (Selective Catalytic Reduction) denitration device - Google Patents
SCR (Selective Catalytic Reduction) denitration device Download PDFInfo
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- CN203525567U CN203525567U CN201320625221.9U CN201320625221U CN203525567U CN 203525567 U CN203525567 U CN 203525567U CN 201320625221 U CN201320625221 U CN 201320625221U CN 203525567 U CN203525567 U CN 203525567U
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Abstract
The utility model provides an SCR (Selective Catalytic Reduction) denitration device. The SCR denitration device is used for denitrating smoke of a boiler which is provided with a flue for discharging smoke; the SCR denitration device comprises a catalyst spraying device for spraying a powdery catalyst into the flue. According to the SCR denitration device, the powdery catalyst is sprayed into the flue so as to guarantee that the catalyst has the greatest reaction capability and the good denitration effect can be realized by spraying a bit of catalyst; furthermore, by virtue of a speed reducing layer, the staying time of the powdery catalyst can be prolonged and the catalytic efficiency is increased. According to the SCR denitration device, the spraying amount of the powdery catalyst can be flexibly adjusted according to the concentration of nitric oxides in smoke, and the SCR denitration device can be used for treating smoke with wide fluctuation of nitric oxides.
Description
Technical field
The utility model relates to gas denitrifying technology field, particularly relates to a kind of new SCR denitrification apparatus.
Background technology
At present, new power plant construction can adopt SCR (SCR) technique to carry out denitration conventionally.SCR denitrating system is generally comprised of SCR reactor, catalyst module, ammonia storage and supply system, ammonia spraying system, economizer bypass, SCR bypass and relevant test control system etc.Wherein, catalyst module is placed in the flue of SCR reactor with the form of fixed bed, and at catalyst fixed bed upstream region, NH3 is injected in flue and mixes with flue gas.When smoke gas flow is when catalyst fixed bed, NH3 reacts generation N2 with the nitrogen oxide in flue gas in the presence of catalyst, realizes denitration.SCR technique denitration effect is better, but investment is large, and requires catalyst module to have good contamination resistance to resist the adverse effect of SO2 and H2O; Also require it to there is good heat shock resistance and mechanical strength properties simultaneously.In addition, because SCR reactor need to be arranged between boiler and deduster, and SCR reactor volume is larger, between the boiler of the old power plant of China and deduster, without sufficient space, can utilize, thereby cannot adopt SCR technique to carry out denitration.And existing SCR system also existed after work a period of time, the defect of catalytic effect fast-descending.Therefore, need to develop new equipment for denitrifying flue gas and denitration method for flue gas.
Utility model content
An object of the present utility model is that a kind of new SCR denitrification apparatus will be provided.Further object of the utility model is that a kind of SCR denitrification apparatus of keeping catalytic efficiency higher of can continuing will be provided.Another further object of the utility model is to simplify existing SCR denitrating system, and a kind of SCR denitrification apparatus that the little space of old power plant is used that is applicable to is provided.
In order to realize above-mentioned at least one object, the utility model provides a kind of SCR denitrification apparatus, for the flue gas of boiler is carried out to denitration, described boiler has for discharging the flue of flue gas, and described SCR denitrification apparatus comprises for fine catalyst being sprayed into the catalyst injector of described flue.This fine catalyst can be the selective catalytic reduction reaction for denitration (SCR) to be played to the catalyst of catalytic action.
In one embodiment, SCR denitrification apparatus of the present utility model can also comprise the deceleration layer for the described described flue gas that slows down layer of flowing through is slowed down, and the downstream part along described flow of flue gas direction in described catalyst injector is arranged in described flue.In one embodiment, described deceleration layer can have loose structure.
In one embodiment, described catalyst injector can comprise: the pipeline extending in described flue; With a plurality of shower nozzles along described pipe arrangement.In one embodiment, described pipeline can extend in described flue in horizontal plane.
In one embodiment, SCR denitrification apparatus of the present utility model can also comprise catalyst transport system, and described catalyst transport system can comprise: blower fan; And rotary feeder, described rotary feeder is connected with catalyst source, described blower fan and described catalyst injector respectively, under the effect of described blower fan, the fine catalyst in described catalyst source is transported to described catalyst injector.
In one embodiment, SCR denitrification apparatus of the present utility model can also comprise the adjuster of amount that is sprayed into the fine catalyst of described flue by described catalyst injector for regulating.
In one embodiment, SCR denitrification apparatus of the present utility model can also comprise reducing agent injector, and the upstream end along described flow of flue gas direction in described catalyst injector is arranged in described flue.
In one embodiment, the flue-gas temperature that described reducing agent injector can be arranged in described flue is applicable to occurring the location that SNCR reacts.
In one embodiment, described catalyst injector can be arranged on the applicable location that selective catalytic reduction reaction occurs of flue-gas temperature in described flue.
The utility model at least has advantages of the following aspects:
1) according to SCR denitrification apparatus of the present utility model, catalyst is that the form with powder is injected in flue gas, so it is suitable for using in high dirt environment, and the catalytic effect of catalyst can not be subject to the impact of flue gas and reduce in time.
2) the utility model sprays into fine catalyst in flue, guarantees that catalyst has maximum respond, sprays a small amount of catalyst and can reach good denitration effect; Further, be used in conjunction with the layer that slows down, can extend the time of staying of fine catalyst, increase catalytic efficiency.
3) catalyst content being placed in flue in traditional denitrating technique is fixed, when saving without emergency approach appears when abnormal in flue gas, and the utility model can be according to the straying quatity of the height flexible modulation fine catalyst of nitrogen oxides in effluent concentration, can be for the processing of the nitrogen oxide containing gas of big ups and downs.
4) SCR denitrification apparatus of the present utility model does not need additionally to arrange SCR reactor and SCR bypass, denitration reaction can carry out in the flue of boiler, saved cost and taken up room littlely, be applicable to the old power plant of China and use, and can adopt different spray regimes according to field conditions.
5) the utility model can spray into ammonia when the high temperature, react and carry out denitration with nitrogen oxide generation SNCR (SNCR) in flue gas, when ammonia moves to 600 ℃ of temperature when following with smoke gas flow, contact with fine catalyst, now there is SCR with nitrogen oxide in flue gas and react.The utility model can have the effect of SNCR and two kinds of denitrations of SCR concurrently simultaneously, can better realize the denitration of flue gas and process.
According to the detailed description to the utility model specific embodiment by reference to the accompanying drawings below, those skilled in the art will understand above-mentioned and other objects, advantage and feature of the present utility model more.
Accompanying drawing explanation
Hereinafter in exemplary and nonrestrictive mode, describe specific embodiments more of the present utility model in detail with reference to the accompanying drawings.In accompanying drawing, identical Reference numeral has indicated same or similar parts or part.It should be appreciated by those skilled in the art that these accompanying drawings may not draw in proportion.In accompanying drawing:
Fig. 1 is according to a kind of typical application scenario of the SCR denitrification apparatus of an embodiment of the utility model;
Fig. 2 is according to the structural representation of the catalyst transport system of an embodiment of the utility model;
Fig. 3 is according to the structural representation of the catalyst transport system of another embodiment of the utility model;
Fig. 4 is according to the apparatus arrangement of the catalyst transport system of an embodiment of the utility model and land area schematic diagram.
Mark in accompanying drawing:
1, boiler; 2, ammonia injector; 3, ammonia storage tank; 4, catalyst injector; 5, catalyst inlet; 6, catalyst conveying equipment; 7, layer slows down; 8, flue; 9, air preheater; 10, electric cleaner; 11, absorption tower; 12, heat exchanger; 13, chimney; 201, blower fan; 202, rotary feeder; 203, catalyst storage tank; 204, steam heater; 205, screw conveyor; 208, electric cabinet; 209, operating platform; 210, catalyst storage space.
The specific embodiment
Fig. 1 shows a kind of typical application scenario of the SCR denitrification apparatus of the utility model embodiment.As shown in Figure 1, existing power plant generally comprises boiler 1, for discharging the flue 8 of flue gas, and ammonia storage tank 3, air preheater 9, electric cleaner 10, absorption tower 11, heat exchanger 12 and chimney 13 etc.In conventional SCR system, SCR reactor is arranged between boiler 1 and electric cleaner 10, for high dirt environment is arranged.Applicant finds, why the catalytic efficiency of existing SCR catalyst reactor can fast-descending, on the one hand that volume of smoke because carrying in region flue gas for this reason can result in blockage to the eyelet of catalyst, on the other hand, in SCR running, catalyst is also subject to the long term of the materials such as alkali metal, water vapour, arsenic, causes catalyst poisoning.These factors all can cause that catalyst accelerates to lose efficacy.Therefore in the utility model, catalyst is not that the form with fixed bed is placed in SCR reactor, but is injected in flue gas with the form of powder.
SCR denitrification apparatus of the present utility model also can be arranged between boiler 1 and electric cleaner 10.Wherein, ammonia injector 2 can be arranged on the upstream region in flue 8, is preferably arranged on the location that flue-gas temperature in flue 8 is applicable to occurring SNCR reaction, for example, can be arranged on flue-gas temperature in flue 8 and be the location of 800 ℃.
Catalyst inlet 5 is arranged on flue 8, is positioned at the downstream area of ammonia injector 2.Fine catalyst is 4 places of the catalyst injector in catalyst inlet 5 is transported to flue 8 by catalyst conveying equipment 6, then are sprayed in flue 8 by catalyst injector 4.Catalyst injector 4 can comprise: at the pipeline of flue 8 interior extensions with along a plurality of shower nozzles of pipe arrangement.Pipeline can extend in flue 8 in a horizontal plane, and the mode of extension can be extended for complications, can be also spiral extension.Catalyst injector 4 can be arranged on the applicable location that selective catalytic reduction reaction occurs of flue-gas temperature in flue 8.For example, take ferrous sulfate during as fine catalyst that active component is made using, it is the location of 300～550 ℃ that this catalyst injector 4 can be arranged in flue-gas temperature in flue 8.
The downstream area that is positioned at catalyst injector 4 along flow of flue gas direction at flue 8, the deceleration layer 7 that can also be provided for flue gas to slow down.The layer 7 that slows down can have loose structure.The layer 7 that slows down can be made of porous materials.In one embodiment, deceleration layer 7 can be made by ceramic fibre and cordierite.For example can, by after ceramic fibre and cordierite mixing, be shaped to the cell structure with mesh shape.Because the layer 7 that slows down exists a large amount of micropores, can adsorb the fine catalyst in the flue gas that upstream flow comes, can be used as denitration key reaction place.In addition, the high surface porous mass-energy of the layer 7 that slows down is enough disperseed and water conservancy diversion flue gas, increases flue gas in the holdup time of grid, thereby increases denitration efficiency the time of contact of prolong smoke and catalyst fines.
Fig. 2 shows the structural representation of the catalyst transport system of an embodiment.As shown in Figure 2, catalyst transport system 6 can comprise: blower fan 201, the rotary feeder 202 being connected with catalyst storage tank 203, blower fan 201 and catalyst injector 4 respectively.Blower fan 201 is for providing the source of the gas that transports fine catalyst.Rotary feeder for being transported to catalyst injector 4 by the fine catalyst of catalyst storage tank 203 under the effect of blower fan.
In the embodiment going out as shown in Figure 3, to compare with embodiment illustrated in fig. 2, this catalyst transport system 6 has also additionally comprised steam heater 204 and auger hauler 205.Wherein, steam heater 204 is arranged between blower fan 201 and rotary feeder 202, for heating the source of the gas blowing out from blower fan 201 so that when source of the gas mixes with fine catalyst by fine catalyst preheating.This steam heater can adopt the waste heat of emission from boiler as thermal source.Auger transporter 205 is for being transported to catalyst storage tank 203 by fine catalyst from catalyst storeroom.
Fig. 4 shows apparatus arrangement and the land area schematic diagram of the catalyst transport system of an embodiment of the utility model.As shown in Figure 4, mainly comprise catalyst storage space 210, auger hauler 205, is placed with the operating platform 209 of catalyst storage tank 203 and rotary feeder 202 and electric cabinet 208 and blower fan 201.As can be seen from Figure 4, arrange that the required space of these equipment is not more than 12m * 5m, because requisite space is little, be applicable to very much old power plant and use.Can, according to the concrete condition of the existing boiler of old power plant and electric cleaner, catalyst transport system be accomplished to attractive in appearance, generous, brevity and lucidity.
In the utility model, because fine catalyst enters in flue with the form of spraying, preferably use nontoxic and cheap catalyst, so just can in flue, directly with fume emission, go out.The denitrating catalyst that the ferrous sulfate of take is active component is a kind of preferred non-toxic catalyst.In prior art, disclosing and having chosen active component is ferrous sulfate, carrier is the honeycombed catalyst of molecular sieve, can be prepared into pulverous catalyst in the ratio of active component and carrier in this catalyst, this is that those skilled in the art easily realize.
An embodiment of the method for denitration of SCR denitrification apparatus of the present utility model can comprise:
Step a: denitrification reducing agent is injected in the smoke gas flow that contains nitrogen oxide;
Step b: in smoke gas flow, spray into the downstream area of denitrification reducing agent, spray into fine catalyst, make denitrification reducing agent under the catalytic action of fine catalyst with nitrogen oxide generation selective catalytic reduction reaction.
In step a, denitrification reducing agent can be ammonia, and the supply mode in ammonia source can adopt the usual manners such as urea pyrolysis or liquefied ammonia.In step b, fine catalyst can be chosen and take the nontoxic fine catalyst that ferrous sulfate is active fraction preparation.Can be according to the concentration adjustment of nitrogen oxide the amount to the fine catalyst spraying in smoke gas flow.In addition, the layer that slows down can also be provided, along flow of flue gas direction, be arranged on the downstream area that sprays into fine catalyst of smoke gas flow, for reducing the flow velocity that is mixed with the smoke gas flow of denitrification reducing agent and fine catalyst, to extend the time of selective catalytic reduction reaction.
So far, those skilled in the art will recognize that, although detailed, illustrate and described a plurality of exemplary embodiment of the present utility model herein, but, in the situation that not departing from the utility model spirit and scope, still can directly determine or derive many other modification or the modification that meets the utility model principle according to the disclosed content of the utility model.Therefore, scope of the present utility model should be understood and regard as and cover all these other modification or modifications.
Claims (10)
1. a SCR denitrification apparatus, for the flue gas of boiler is carried out to denitration, described boiler has for discharging the flue of flue gas, it is characterized in that, and described SCR denitrification apparatus comprises for fine catalyst being sprayed into the catalyst injector of described flue.
2. SCR denitrification apparatus according to claim 1, is characterized in that, also comprises the deceleration layer for the described described flue gas that slows down layer of flowing through is slowed down, and the downstream part along described flow of flue gas direction in described catalyst injector is arranged in described flue.
3. SCR denitrification apparatus according to claim 2, is characterized in that, described deceleration layer has loose structure.
4. SCR denitrification apparatus according to claim 1, is characterized in that, described catalyst injector comprises:
The pipeline extending in described flue; With
A plurality of shower nozzles along described pipe arrangement.
5. SCR denitrification apparatus according to claim 4, is characterized in that, described pipeline extends in described flue in horizontal plane.
6. SCR denitrification apparatus according to claim 1, is characterized in that, also comprises catalyst transport system, and described catalyst transport system comprises:
Blower fan; With
Rotary feeder, described rotary feeder is connected with catalyst source, described blower fan and described catalyst injector respectively, under the effect of described blower fan, the fine catalyst in described catalyst source is transported to described catalyst injector.
7. SCR denitrification apparatus according to claim 1, is characterized in that, also comprises the adjuster of amount that is sprayed into the fine catalyst of described flue by described catalyst injector for regulating.
8. SCR denitrification apparatus according to claim 1, is characterized in that, also comprises reducing agent injector, and the upstream end along described flow of flue gas direction in described catalyst injector is arranged in described flue.
9. SCR denitrification apparatus according to claim 8, is characterized in that, the flue-gas temperature that described reducing agent injector is arranged in described flue is applicable to occurring the location that SNCR reacts.
10. according to the SCR denitrification apparatus described in any one in claim 1～9, it is characterized in that, described catalyst injector is arranged on the applicable location that selective catalytic reduction reaction occurs of flue-gas temperature in described flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320625221.9U CN203525567U (en) | 2013-10-10 | 2013-10-10 | SCR (Selective Catalytic Reduction) denitration device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320625221.9U CN203525567U (en) | 2013-10-10 | 2013-10-10 | SCR (Selective Catalytic Reduction) denitration device |
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| CN203525567U true CN203525567U (en) | 2014-04-09 |
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| CN201320625221.9U Expired - Fee Related CN203525567U (en) | 2013-10-10 | 2013-10-10 | SCR (Selective Catalytic Reduction) denitration device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103551033A (en) * | 2013-10-10 | 2014-02-05 | 北京水木星源环保科技有限公司 | Scr denitration device and flue gas denitration method |
| CN106512718A (en) * | 2016-11-16 | 2017-03-22 | 盐城工学院 | Method of denitration outside furnace |
| CN111545049A (en) * | 2020-04-29 | 2020-08-18 | 南京赤博环保科技有限公司 | SNCR (Selective non catalytic reduction) denitration system and method for removing escaping ammonia in SNCR denitration process |
-
2013
- 2013-10-10 CN CN201320625221.9U patent/CN203525567U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103551033A (en) * | 2013-10-10 | 2014-02-05 | 北京水木星源环保科技有限公司 | Scr denitration device and flue gas denitration method |
| CN103551033B (en) * | 2013-10-10 | 2016-08-17 | 王盛 | Scr denitration device |
| CN106512718A (en) * | 2016-11-16 | 2017-03-22 | 盐城工学院 | Method of denitration outside furnace |
| CN111545049A (en) * | 2020-04-29 | 2020-08-18 | 南京赤博环保科技有限公司 | SNCR (Selective non catalytic reduction) denitration system and method for removing escaping ammonia in SNCR denitration process |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140409 Termination date: 20191010 |
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| CF01 | Termination of patent right due to non-payment of annual fee |