CN207455619U - Solve the flue gas recirculation structure of SCR denitration underrun dust stratification abrasion - Google Patents
Solve the flue gas recirculation structure of SCR denitration underrun dust stratification abrasion Download PDFInfo
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- CN207455619U CN207455619U CN201720274653.8U CN201720274653U CN207455619U CN 207455619 U CN207455619 U CN 207455619U CN 201720274653 U CN201720274653 U CN 201720274653U CN 207455619 U CN207455619 U CN 207455619U
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- scr denitration
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model provides a kind of flue gas recirculation structure for solving the problem of the abrasion of SCR denitration underrun dust stratification and has well solved dust stratification under current SCR denitration device underrun normality, worn.The exhanst gas outlet of boiler is connected with the smoke inlet of economizer；The exhanst gas outlet of economizer is connected with the smoke inlet of gas approach；The exhanst gas outlet of gas approach is connected with the smoke inlet of SCR denitration reactor；The exhanst gas outlet of SCR denitration reactor is connected with the smoke inlet of exhaust pass；The exhanst gas outlet of exhaust pass is connected with the smoke inlet of air preheater；Ammonia mixing arrangement is sprayed to be mounted in gas approach；Bypass flue is set between gas approach and exhaust pass, and bypass flue one end is connected with gas approach, and the other end is connected with exhaust pass, and the position that bypass flue one end is connected with gas approach is located in front of spray ammonia mixing arrangement；By-pass damper and air-introduced machine are mounted in bypass flue.
Description
Technical field
The utility model is related to a kind of flue gas recirculation structures for solving the abrasion of SCR denitration underrun dust stratification.
Background technology
Energy resource structure of the China based on coal will not change within the long duration, therefore, control coal-fired flue-gas NOx emission
It is an important process of China's control atmosphere pollution.With NH3For the NOx selective catalytic reduction of reducing agent（SCR）Technology is
Most widely used in recent years, most effective coal-fired flue gas denitration technology.On the other hand, flue gas during SCR denitration device design and construction
Although flow velocity must take into account high underload simultaneously, the performance that must preferentially meet in Practical Project under high-load condition will
It asks, therefore the reaction condition under higher load condition is more abundant, however current Thermal generation unit generally faces long-term underload
Operation situation, and it is expected that will be difficult to change within following a period of time, with this condition, SCR denitration device low flue gas for a long time
Load operation, flue gas flow rate is slower in reactor, be easy to cause dust stratification, blocks, and in turn results in catalyst abrasion, reaction efficiency drop
The problem of low, also shows increasingly.Therefore, the dust stratification wear problem under SCR denitration underrun how is effectively solved, becomes and works as
The important topic in preceding coal-fired flue gas denitration field.
With the relevant patent of problem above, such as 101791518 B of CN ---《Be conducive to blowing deposited dust denitrating system and
Denitrating system catalyst arrangement method》, it is by making to keep one between the periphery of catalyst combination module and the wall of reactor
Fixed gap and soot blower are equipped with, and are ensured that ash content is most of and are discharged from reactor wall surrounding, so as to which ash be alleviated or avoided
Divide and block.The method is to belong to strengthen that flying dust is through-flow and soot blowing avoids catalyst dust stratification, but fails to solve other positions of reactor
The problem of putting dust stratification, and increasing flue gas flow area can cause smoke corridor, reduce the denitration efficiency of denitrification apparatus.
For another example 202792064 U of CN ---《The SCRSCR Benitration reactor flue systems of accumulatingdust》, it is by inputting
Dust collection chamber on flue is set and is connected to output flue, so as to reduce into the flying dust amount into SCR reactors, mitigates dust
Abrasion and Poisoning Effect to catalyst.The method belongs to collects a part of flying dust in advance, avoids it anti-into SCRSCR denitrations
It answers in device, but the method is relatively suitable for intercepting bulky grain flying dust, for little particle flying dust effect unobvious, and should in Practical Project
In, the stronger little particle flying dust of viscosity tends to cause serious dust stratification in reactor, therefore under low load condition
There are still certain limitations for dust stratification in SCR reactors.
Utility model content
The purpose of the utility model is to overcome above-mentioned deficiency in the prior art, and a kind of structure design is provided and is closed
The flue gas recirculation structure of the solution SCR denitration underrun dust stratification abrasion of reason, has well solved current SCR denitration device
The problem of dust stratification under underrun normality, abrasion.
The technical scheme in the invention for solving the above technical problem is：A kind of solution SCR denitration underrun product
The flue gas recirculation structure of ash abrasion, including boiler, economizer, gas approach, SCR denitration reactor, exhaust pass, air preheater
With spray ammonia mixing arrangement；The exhanst gas outlet of boiler is connected with the smoke inlet of economizer；The exhanst gas outlet of economizer and entrance cigarette
The smoke inlet connection in road；The exhanst gas outlet of gas approach is connected with the smoke inlet of SCR denitration reactor；SCR denitration is reacted
The exhanst gas outlet of device is connected with the smoke inlet of exhaust pass；The exhanst gas outlet of exhaust pass and the smoke inlet of air preheater connect
It is logical；Ammonia mixing arrangement is sprayed to be mounted in gas approach；It is characterized in that：Further include by-pass damper, air-introduced machine and bypass flue；
Bypass flue is set between gas approach and exhaust pass, and bypass flue one end is connected with gas approach, the other end and outlet cigarette
Road connects, and the position that bypass flue one end is connected with gas approach is located in front of spray ammonia mixing arrangement；By-pass damper and air inducing
Machine is mounted in bypass flue.
By-pass damper described in the utility model is close to one end that bypass flue is connected with gas approach.
The utility model is provided with soot blower in by-pass damper position.
The utility model compared with prior art, has the following advantages and effect：Tthe utility model system flow is simple, fortune
Row is stablized, workable, and applicability is respectively provided with to newly-built denitrification apparatus or the transformation of active service denitrification apparatus, therefore with good
Environmentally friendly, economic benefit is with being widely applied prospect.
Description of the drawings
Fig. 1 is the structure diagram of the utility model flue gas recirculation structure.
Specific embodiment
Below in conjunction with the accompanying drawings and pass through embodiment the utility model is described in further detail.
Referring to Fig. 1, the flue gas recirculation structure that the utility model solves the abrasion of SCR denitration underrun dust stratification includes pot
Stove 1, economizer 2, by-pass damper 3, air-introduced machine 4, bypass flue 5, gas approach 6, SCR denitration reactor 7, exhaust pass 8, sky
Pre- device 9 and spray ammonia mixing arrangement 10.
The exhanst gas outlet of boiler 1 is connected with the smoke inlet of economizer 2.The exhanst gas outlet of economizer 2 and gas approach 6
Smoke inlet connects.The exhanst gas outlet of gas approach 6 is connected with the smoke inlet of SCR denitration reactor 7.SCR denitration reactor 7
Exhanst gas outlet connected with the smoke inlet of exhaust pass 8.The exhanst gas outlet of exhaust pass 8 connects with the smoke inlet of air preheater 9
It is logical.Ammonia mixing arrangement 10 is sprayed to be mounted in gas approach 6.
Bypass flue 5 is provided between gas approach 6 and exhaust pass 8,5 one end of bypass flue connects with gas approach 6
Logical, the other end is connected with exhaust pass 8.
5 one end of bypass flue in front of spray ammonia mixing arrangement 10, is needed with the position that gas approach 6 connects in Practical Project
Specific location and hybrid mode are designed by flow field simulation result, to ensure that the flue gas homogeneity condition for reaching catalyst inlet is expired
Sufficient performance indicator requirement.
Air-introduced machine 4 is mounted in bypass flue 5, with flue gas after realization extraction partial denitrification to gas approach 6, bypass flue
5 flows need to be adjusted according to concrete engineering technical parameter with requirement, and mixed exhaust gas volumn must realize SCR denitration reactor 7
Interior flue gas flow rate control is in 4m/s~6m/s.
By-pass damper 3 is mounted in bypass flue 5, with control bypass operation.By-pass damper 3 is close proximity to bypass flue 5
The one end connected with gas approach 6 can set soot blower in 3 position of by-pass damper if necessary to avoid dust stratification.
A kind of right solves the flue gas recirculation side of the flue gas recirculation structure of SCR denitration underrun dust stratification abrasion
Method：
Flue gas initially enters economizer 2 and exchanges heat after boiler 1 comes out, and is then mixed by gas approach 6 and spray ammonia
It attaches together and carries out SCR denitration reaction into SCR denitration reactor 7 after putting 10, the flue gas after denitration is pre- into sky by exhaust pass 8
Device 9 is then exhausted from flowing to tail flue gas purifier, final qualified discharge after being exchanged heat.When the long-term underrun of unit,
Open by-pass damper 3, open air-introduced machine 4, by a part of exiting flue gas in exhaust pass 8 be recycled to gas approach 6 with it is therein
Flue gas is mixed, and so as to increase the exhaust gas volumn into SCR denitration reactor 7, mixed flue gas passes through SCR denitration reactor
After 7 carry out denitration reaction, qualified discharge, a part will be carried out new cycling by a part.
Above content described in this specification is only to the utility model structure example explanation；Moreover,
The title that the utility model each several part is taken can not also be same, all constructions according to described in the utility model patent concept, feature and
The equivalent or simple change that principle is done, is included in the protection domain of the utility model patent.
Claims (3)
1. a kind of flue gas recirculation structure for solving the abrasion of SCR denitration underrun dust stratification, including boiler, economizer, entrance
Flue, SCR denitration reactor, exhaust pass, air preheater and spray ammonia mixing arrangement；The exhanst gas outlet of boiler and the flue gas of economizer
Entrance connects；The exhanst gas outlet of economizer is connected with the smoke inlet of gas approach；The exhanst gas outlet and SCR denitration of gas approach
The smoke inlet connection of reactor；The exhanst gas outlet of SCR denitration reactor is connected with the smoke inlet of exhaust pass；Exhaust pass
Exhanst gas outlet connected with the smoke inlet of air preheater；Ammonia mixing arrangement is sprayed to be mounted in gas approach；It is characterized in that：Also wrap
Include by-pass damper, air-introduced machine and bypass flue；Bypass flue, bypass flue one end are set between gas approach and exhaust pass
It is connected with gas approach, the other end is connected with exhaust pass, and the position that bypass flue one end is connected with gas approach is located at spray
In front of ammonia mixing arrangement；By-pass damper and air-introduced machine are mounted in bypass flue, open by-pass damper, open air-introduced machine, can be incited somebody to action
A part of exiting flue gas is recycled to gas approach in exhaust pass.
2. the flue gas recirculation structure according to claim 1 for solving the abrasion of SCR denitration underrun dust stratification, feature
It is：The by-pass damper is close to one end that bypass flue is connected with gas approach.
3. the flue gas recirculation structure according to claim 1 for solving the abrasion of SCR denitration underrun dust stratification, feature
It is：By-pass damper position is provided with soot blower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720274653.8U CN207455619U (en) | 2017-03-21 | 2017-03-21 | Solve the flue gas recirculation structure of SCR denitration underrun dust stratification abrasion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720274653.8U CN207455619U (en) | 2017-03-21 | 2017-03-21 | Solve the flue gas recirculation structure of SCR denitration underrun dust stratification abrasion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207455619U true CN207455619U (en) | 2018-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720274653.8U Active CN207455619U (en) | 2017-03-21 | 2017-03-21 | Solve the flue gas recirculation structure of SCR denitration underrun dust stratification abrasion |
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|---|---|
| CN (1) | CN207455619U (en) |
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2017
- 2017-03-21 CN CN201720274653.8U patent/CN207455619U/en active Active
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