CN206152638U - SCR deNOx systems - Google Patents

SCR deNOx systems Download PDF

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Publication number
CN206152638U
CN206152638U CN201621212581.6U CN201621212581U CN206152638U CN 206152638 U CN206152638 U CN 206152638U CN 201621212581 U CN201621212581 U CN 201621212581U CN 206152638 U CN206152638 U CN 206152638U
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CN
China
Prior art keywords
flue gas
ammonia
cyclone type
scr
blender
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201621212581.6U
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Chinese (zh)
Inventor
周杰联
湛志钢
冯永新
殷立宝
许凯
宋景慧
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Electric Power Research Institute of Guangdong Power Grid Co Ltd
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Priority to CN201621212581.6U priority Critical patent/CN206152638U/en
Application granted granted Critical
Publication of CN206152638U publication Critical patent/CN206152638U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

This application belongs to flue gas denitration device and pulverized coal boiler operation field, concretely relates to SCR deNOx systems. The utility model provides a SCR deNOx systems, including ammonia injection grid, whirlwind formula flue gas blender and two -way heat transfer valve. This system can through set gradually ammonia injection grid and whirlwind formula blender in the afterbody flue, utilize the strong rotation of air current to improve the mixed effect of reductant NH3 with NOX greatly on the basis that does not increase SCR reactor entry flue length, has reduced the influence of flue gas velocity inequality to SCR reactor denitrification effect, avoids the problem that NH3 escaped or denitration efficiency is low, and reinforcing NH3 and NOX's mixed effect simultaneously, can also detach big particle diameter dust in the flue gas effectively, realization flying dust desorption has improved the wearing and tearing and the deposition problem of catalyst effectively.

Description

A kind of SCR denitration system
Technical field
This utility model belongs to equipment for denitrifying flue gas and pulverized-coal fired boiler operation field, and in particular to a kind of SCR denitration system.
Background technology
Selective catalytic reduction (SCR) is a kind of denitration technology studied at present and be most widely used, and its principle is NO in flue gasxIn the presence of catalyst, with NH3As reducing agent, " selective " and NH3React and generate nontoxic nothing The N of pollution2And H2O.It is main in pulverized-coal fired boiler environmental technology field at present to adopt SCR system to remove the NO in boiler smokex
The factor for affecting SCR denitration effect is mainly:Denitration reaction temperature, catalyst activity, flue gas flow field distribution and Reducing agent (NH3) and NOXMixed effect.It is the different degrees of catalyst poisoning of the SCR denitration device generally existing that now puts into operation, stifled The technological deficiency that plug causes that denitration efficiency is low, ammonia consumption is big and the escaping of ammonia is exceeded etc., the especially exceeded situation of the escaping of ammonia into For universal phenomenon, the safe and stable operation of SCR device and boiler controller system has been had a strong impact on.Current environmental requirement is increasingly strict, special Be not the coastal region in east China newly go up power generation project common demands flue gas pollutant discharge reach ultra-clean emission request (wherein NOxRow Requirement is put in 50mg/Nm3Within).
Under normal circumstances, it is to adapt to ultra-clean emission request, increases and one layer of catalyst is set, but is because that flow field is uneven, enters The local ammonia nitrogen mol ratio imbalance that mouth nitrous oxides concentration inequality, mixed effect difference etc. cause, when local, ammonia density is too high, owns NOxDuring Restore All, then regional area NH occurs3It is significantly exceeded, so as to going out the problems such as causing air preheater ash deposits corrosion It is existing.It is many at present SCR system is optimized using the method such as adjustment flue deflector or adjustment ammonia-spraying grid for the problems referred to above Adjustment, to improve SCR outlet NOXAnd NH3The problem of skewness.However, there are shortcomings in the method, for example:In actual fortune During row, flue gas in flue flowing is in itself changeable, and flue deflector is affected by flue length, position limitation etc., right Flue gas flow field distribution Adjustment effect effect is limited, and especially for now large-scale boiler controller system, flue cross dimensions is very big, Cannot really realize that velocity field and concentration field are uniform;Either deflector or other conventional mixer, ammonia spray into after with flue gas Mixing can only be common static mixing, and the scope of mixing is also to mix in certain subrange, it is impossible to realize whole flue Interior ammonia nitrogen mol ratio is uniform, when requiring low high NOxDuring concentration of emission, local NH must occurs3Injection rate is excessive, escapes super Mark;And, the means of ammonia-spraying grid adjustment are single, only by measurement SCR outlet NOXSituation be adjusted, adjustment effect It is limited and not good to the adaptability of the changes such as unit load, firing optimization, it is only applicable to single load and burning operation bar Part, when needing to re-start ammonia-spraying grid adjustment after load variations;Local waste and the mill of catalyst of catalyst cannot be improved Damage and dust stratification problem.
Utility model content
In view of this, this utility model provide a kind of SCR denitration system, the system can energy-conservation, efficiently improve SCR Reactor runs, and improves NOXAnd NH3Mixed effect, effectively facilitate smoke pollution of boiler thing emission compliance, realize environmental protection Target.
The concrete technical scheme of the present invention is as follows:
The invention provides a kind of SCR denitration system, including ammonia-spraying grid, cyclone type flue gas blender and two-direction heat-exchanging Valve;
The ammonia-spraying grid is arranged at before the entrance of the cyclone type flue gas blender;
The cyclone type flue gas blender is arranged on back-end ductwork, communicates with boiler furnace;
The upper outlet of the cyclone type flue gas blender connects the inlet flue gas runner of SCR reactors;
The lower part outlet of the cyclone type flue gas blender connects the two-direction heat-exchanging valve by pipeline.
Preferably, the ammonia-spraying grid includes ammonia nozzle and spray ammonia pipeline arm;The ammonia nozzle is arranged on described On spray ammonia pipeline arm, the spray ammonia pipeline arm is arranged at before the entrance of cyclone mixer.
Preferably, there is interval, positioned at described between the entrance of the ammonia-spraying grid and the cyclone type flue gas blender The edge of spray ammonia pipeline cyclone type flue gas blender described in pipe distance of ammonia-spraying grid bottommost is less than or equal to 200mm.
Preferably, 3 spray ammonia pipeline arms are at least arranged before the entrance of each cyclone mixer;The ammonia nozzle sets The lee face in flue gas flow direction is put, is in 60 ° with the flue gas flow direction.
Preferably, the cyclone type flue gas blender includes furnace hopper, and the furnace hopper is cyclone type flue gas mixing The bottom of device;The lower part outlet of the furnace hopper connects the two-direction heat-exchanging valve by pipeline.
Above-mentioned SCR denitration system also includes:Cooler and Hui Ku;The cooler connects the grey storehouse;It is described two-way to change Connect the boiler furnace and the cooler to valve.
Above-mentioned SCR denitration system also includes:Air preheater and electric cleaner;The air preheater connects the SCR Reactor and the electric cleaner;The electric cleaner connects the grey storehouse.
Compared with prior art, this utility model has the advantages that:
(1) a kind of SCR denitration system provided by the utility model, can not increase SCR reactor inlet flue lengths On the basis of, by setting gradually ammonia-spraying grid and cyclone type blender in back-end ductwork, make use of the strong rotation of air-flow Substantially increase reducing agent NH3With NOXMixed effect so that boiler smoke obtains uniform before into SCR reactors NH3/NOXMol ratio, greatly reduces the uneven impact to SCR reactor denitration effects of flue gas flow rate, it is to avoid local NH occur3/ NOxIt is excessive or too small and cause NH3The low problem of escape or denitration efficiency;
(2) system has good adaptability to the operation change of SCR reactors, reduces unit load so that SCR device Can run with security and stability with boiler controller system;
(3) system is effectively strengthening reducing agent NH3With NOXMixed effect is big in flue gas at the same time it can also effectively remove Particle diameter dust, realizes that flying dust is removed, and effectively improves abrasion and the dust stratification problem of catalyst.
Description of the drawings
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment Or the accompanying drawing to be used needed for description of the prior art is briefly described, it should be apparent that, drawings in the following description are only It is embodiment of the present utility model, for those of ordinary skill in the art, on the premise of not paying creative work, also Other accompanying drawings can be obtained according to the accompanying drawing for providing.
Fig. 1 is a kind of structural representation of the SCR denitration system provided in this utility model preferred embodiment.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under the premise of creative work is made The every other embodiment for being obtained, belongs to the scope of this utility model protection.
Fig. 1 is a kind of structural representation of the SCR denitration system provided in the present embodiment, as shown in figure 1, institute of the present invention A kind of SCR denitration system for providing, including:Ammonia-spraying grid (1), cyclone type flue gas blender (2) and two-direction heat-exchanging valve (3).Institute State cyclone type flue gas blender (2) and be arranged on back-end ductwork (11), communicate with boiler furnace (12);The ammonia-spraying grid (1) sets Put before the entrance of the cyclone type flue gas blender (2);The upper outlet connection SCR of the cyclone type flue gas blender (2) The inlet flue gas runner of reactor (4);The two-direction heat-exchanging valve (3) connects the bottom of the cyclone type flue gas blender (2) and goes out Mouthful.
Wherein, the ammonia-spraying grid (1) includes ammonia nozzle and spray ammonia pipeline arm, and the ammonia nozzle is arranged on described On spray ammonia pipeline arm, the spray ammonia pipeline arm is arranged at before the entrance of cyclone mixer;In each cyclone mixer (2) 3 spray ammonia pipeline arms are at least arranged before entrance, the ammonia nozzle is arranged on the lee face of flue gas flow direction, with the flue gas stream To in 60 °;There is interval, positioned at the spray between the ammonia-spraying grid (1) and the entrance of the cyclone type flue gas blender (2) The spray ammonia pipeline of ammonia grid (1) bottommost edge of cyclone type flue gas blender (2) described in pipe distance is less than or equal to 200mm。
The cyclone type flue gas blender (2) includes furnace hopper (21), and the furnace hopper (21) is the cyclone type flue gas The bottom of blender (2), the lower part outlet of the furnace hopper (21) connects the two-direction heat-exchanging valve (3) by pipeline.
Above-mentioned SCR denitration system, also including cooler (5) and grey storehouse (6);The cooler (5) connects the grey storehouse (6);The two-way reversal valve (3) connects the boiler furnace (12) and the cooler (5).
Above-mentioned SCR denitration system, also includes:Air preheater (7) and electric cleaner (8);The air preheater (7) is even Lead to the SCR reactors (4) and the electric cleaner (8);The electric cleaner (8) connects the grey storehouse (6).
In a kind of actual moving process of SCR denitration system provided by the utility model, boiler furnace (12) is produced Back-end ductwork (11) of the flue gas from after boiler in out after, enter the rotation after the ammonia-spraying grid (1) sprays liquefied ammonia Wind formula flue gas blender (2), the NO in flue gasxAnd NH3From described after being sufficiently mixed in the cyclone type flue gas blender (2) The upper outlet of cyclone type flue gas blender (2) flows out, and into SCR reactors (4) denitration reaction is carried out, and removes NOxFlue gas afterwards Air inlet preheater (7) exchanges heat, and the flue gas after heat exchange enters electric cleaner (8) and further removed minute dusts and pass through cigarette Chimney is arranged to air, and minute dusts are then dropped in grey storehouse (6).
Wherein, the fly ash content of the flue gas for producing from boiler furnace (12) is high, also containing a small amount of dust.The flue gas Into after cyclone type blender (2), flying dust and dust fall into the furnace hopper (21) of cyclone type blender under cyclonic separation effect In;If the phosphorus content for detecting flying dust is higher, the flying dust in furnace hopper (21) will send boiler back to by two-way reversal valve (3) Rekindle, realize energy saving;If the phosphorus content for detecting flying dust is relatively low, the flying dust in furnace hopper (21) will be by double Cooler (5) is delivered to reversal valve (3) deliver to grey storehouse (6) Jing after cooling.
Cyclone type blender (2) is the core component of this SCR denitration system, and its principle is using gas gas (NH3And flue gas) With gas-solid (flue gas and flying dust dust) two alternate density contrasts, the mixing of circulation of qi promoting gas and gas solid separation are entered under the influence of centrifugal force, (NH in so as to ensure flue gas3) and NOXBe sufficiently mixed, make to possess enough NH into the flue gas before SCR reactors3/NOXRub You compare, and reduce the uneven impact to SCR reactor denitration effects of flue gas flow rate;And, cyclone type blender separates flying dust dust Effect will greatly reduce into the flying dust dust in SCR reactors, improve abrasion and the dust stratification problem of catalyst.Meanwhile, spray The position of ammonia grid (1) ammonia nozzle is also that this SCR denitration system realizes NH3With NOXA well-mixed key Technology, ammonia nozzle is arranged on spray ammonia pipeline arm, positioned at the spray ammonia pipeline pipe distance whirlwind of ammonia-spraying grid (1) bottommost Formula mixer entrance inwall is less than 200mm.
A kind of SCR denitration system provided by the utility model, can be in the base for not increasing SCR reactor inlet flue lengths On plinth, by setting gradually ammonia-spraying grid and cyclone type blender in back-end ductwork, the strong rotation of air-flow is make use of significantly Improve reducing agent NH3With NOXMixed effect so that boiler smoke obtains uniform NH before into SCR reactors3/ NOXMol ratio, greatly reduces the uneven impact to SCR reactor denitration effects of flue gas flow rate, it is to avoid local NH occur3/NOx It is excessive or too small and cause NH3The low problem of escape or denitration efficiency.The system has suitable well to the operation change of SCR reactors Ying Xing, reduces unit load so that SCR device and boiler controller system can run with security and stability.The system is effectively strengthening Reducing agent NH3With NOXMixed effect realizes that flying dust is removed, effectively at the same time it can also effectively remove big particle diameter dust in flue gas Improve abrasion and the dust stratification problem of catalyst.

Claims (7)

1. a kind of SCR denitration system, it is characterised in that including ammonia-spraying grid, cyclone type flue gas blender and two-direction heat-exchanging valve;
The ammonia-spraying grid is arranged at before the entrance of the cyclone type flue gas blender;
The cyclone type flue gas blender is arranged on back-end ductwork, communicates with boiler furnace;
The upper outlet of the cyclone type flue gas blender connects the inlet flue gas runner of SCR reactors;
The lower part outlet of the cyclone type flue gas blender connects the two-direction heat-exchanging valve by pipeline.
2. SCR denitration system according to claim 1, it is characterised in that the ammonia-spraying grid includes ammonia nozzle and spray Ammonia pipeline arm;
The ammonia nozzle is arranged on the spray ammonia pipeline arm, and the spray ammonia pipeline arm is arranged at entering for cyclone mixer Before mouthful.
3. SCR denitration system according to claim 2, it is characterised in that the ammonia-spraying grid and the cyclone type flue gas There is interval, positioned at spray ammonia pipeline cyclone type cigarette described in pipe distance of the ammonia-spraying grid bottommost between the entrance of blender The edge of gas blender is less than or equal to 200mm.
4. SCR denitration system according to claim 2, it is characterised in that before the entrance of each cyclone mixer at least 3 spray ammonia pipeline arms of arrangement;
The ammonia nozzle is arranged on the lee face of flue gas flow direction, is in 60 ° with the flue gas flow direction.
5. SCR denitration system according to claim 1, it is characterised in that the cyclone type flue gas blender includes cold ash Bucket, the furnace hopper is the bottom of the cyclone type flue gas blender;
The lower part outlet of the furnace hopper connects the two-direction heat-exchanging valve by pipeline.
6. SCR denitration system according to claim 1, it is characterised in that also include:Cooler and Hui Ku;
The cooler connects the grey storehouse;
The two-way reversal valve connects the boiler furnace and the cooler.
7. SCR denitration system according to claim 6, it is characterised in that also include:Air preheater and electric cleaner;
The air preheater connects the SCR reactors and the electric cleaner;
The electric cleaner connects the grey storehouse.
CN201621212581.6U 2016-11-10 2016-11-10 SCR deNOx systems Expired - Fee Related CN206152638U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201621212581.6U CN206152638U (en) 2016-11-10 2016-11-10 SCR deNOx systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201621212581.6U CN206152638U (en) 2016-11-10 2016-11-10 SCR deNOx systems

Publications (1)

Publication Number Publication Date
CN206152638U true CN206152638U (en) 2017-05-10

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106390744A (en) * 2016-11-10 2017-02-15 广东电网有限责任公司电力科学研究院 SCR (selective catalytic reduction) denitrification system and operating method thereof
CN110756030A (en) * 2019-11-01 2020-02-07 王惠生 Economical and efficient in-furnace denitration method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106390744A (en) * 2016-11-10 2017-02-15 广东电网有限责任公司电力科学研究院 SCR (selective catalytic reduction) denitrification system and operating method thereof
CN110756030A (en) * 2019-11-01 2020-02-07 王惠生 Economical and efficient in-furnace denitration method

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Granted publication date: 20170510