CN206535429U - A kind of SCR denitration spray ammonia system for adapting to full load mode - Google Patents
A kind of SCR denitration spray ammonia system for adapting to full load mode Download PDFInfo
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- CN206535429U CN206535429U CN201621456544.XU CN201621456544U CN206535429U CN 206535429 U CN206535429 U CN 206535429U CN 201621456544 U CN201621456544 U CN 201621456544U CN 206535429 U CN206535429 U CN 206535429U
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- flue gas
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- scr denitration
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- ammonia
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Abstract
The utility model provides a kind of SCR denitration spray ammonia system for adapting to full load mode, and flue gas pre-mixing apparatus is set before SCR denitration system ammonia-gas spraying device, disturbance mixing is carried out to flue gas before ammonia-gas spraying device so that flue gas NO before spray ammoniaXConcentration and velocity of flue gas distribution are more uniform, reduction flue gas NOXConcentration distribution relative standard deviation and velocity of flue gas distribution relative standard deviation, so as to lift the full load mode adaptability of SCR denitration system ammonia-gas spraying device.
Description
Technical field
The utility model is related to a kind of SCR denitrating flue gas spray ammonia system, particularly a kind of SCR for adapting to full load mode
Ammonia system is sprayed in denitration.
Background technology
Influenceed by energy resource structure, China's primary energy is consumed based on coal, and in power generation ratio, coal-fired firepower
Generating is occupied an leading position for a long time.
As environmental requirement is constantly lifted, coal-burning power plant is both needed to use gas denitrifying technology to control nitrogen oxides (NOX)
Discharge, wherein selective catalytic reduction (SCR) and SNCR method (SNCR) application it is more.SCR flue gases take off
Nitre technology refers to the appropriate location that reactor is arranged in boiler back end ductwork, in the presence of catalyst, and reducing agent (is usually
Liquefied ammonia, ammoniacal liquor or the compound containing amino) with flue gas in NOXSelectively react, and generate free of contamination N2With
H2O.It is excellent that SCR gas denitrifying technologies have denitration efficiency high (80%~90% and more than), secondary pollution small, reliable etc.
Point, is most widely used, the gas denitrifying technology that most ripe, effect is best generally acknowledged both at home and abroad at present.SCR gas denitrifying technologies
Key be to realize NO in flue gasXWith the uniform mixing of reducing agent.Current SCR gas denitrifying technologies use different spray ammonia sides
Formula, such as grid type, mixed type and turbulence type, to realize flue gas NOXUniform with reducing agent is mixed.
China's coal-fired power station boiler SCR denitration system sprays ammonia method using grid mostly, is characterized in reducing agent from grid
Each branch pipe subregion sprays into flue gas, can be according to NO in flue gasXCharacteristic distributions carry out subregion correspondence and supplied.But each of ammonia-spraying grid
Tube valve is after some regulating working conditions is finished, the change that flue gas is produced after changing in actual motion operation not according to boiler load
And the adjustment of ammonia-spraying grid branch pipe valve differentiation is carried out, and simply adjust total spray ammonia flow.Therefore, change in boiler load
When, it is inconsistent that conventional grates spray ammonia method is easily caused catalyst inlet ammonia nitrogen mol ratio, and then causes denitration efficiency to decline, and ammonia is escaped
Ease is a series of problems, such as increase, and its adaptability to boiler full load mode is poor.
Therefore, it is necessary to which open one kind adapts to boiler full load mode, denitration efficiency is improved, and the escaping of ammonia can be reduced
SCR denitration sprays ammonia method.
The content of the invention
To be solved in the utility model is that conventional grates spray ammonia SCR system is easily caused catalyst inlet ammonia nitrogen mol ratio not
Unanimously, and then denitration efficiency is caused to decline, the escaping of ammonia increases and the poor technology of the adaptability to boiler full load mode is asked
Inscribe and adapt to full load mode there is provided one kind, and further improve denitration efficiency, reduction the escaping of ammonia, and adapt to unit and bear entirely
The SCR denitration spray ammonia system of lotus operating mode.
The SCR denitration spray ammonia system that the utility model is a kind of to adapt to full load mode, including flue and along cigarette
Flue gas pre-mixing apparatus, ammonia-gas spraying device that gas direction of advance is set gradually, it is characterised in that described flue gas pre-mixing apparatus is arranged at
In front of ammonia-gas spraying device, disturbance premixing is carried out to flue gas before spray ammonia.
Different from traditional SCR system, the utility model sets flue gas pre-mixing apparatus before ammonia-gas spraying device, to ammonia-gas spraying device
Preceding flue gas carries out disturbance mixing so that flue gas NO before spray ammoniaXConcentration and velocity of flue gas distribution are more uniform, reduce various operation works
Flue gas NO under conditionXConcentration distribution relative standard deviation and velocity of flue gas distribution relative standard deviation, make each branch pipe of ammonia-spraying grid
The reducing agent of penetrating is relatively uniform, and then greatly improves the matching that each branch pipe subregion of ammonia-spraying grid sprays into reduction agent flux, from
And lift the full load mode adaptability of SCR denitration system ammonia-gas spraying device.
Further, the flue gas pre-mixing apparatus is circular discs or star-disc static mixer.
Further, described circular discs or star-disc static mixer are arranged by 1-3, often arrange 8-12 circular discs or star
Disk is combined, and is evenly arranged on the same section of the flue before ammonia-gas spraying device.
Further, the disc static mixer is made up of wear-resisting steel, and each disk diameter is 1m~1.5m,
Thickness is 10mm~20mm.
Further, described circular discs or star-disc be using horizontal line as axle center, and with flue gas flow direction into 30-60 ° of angle.
Further, the SCR denitration spray ammonia system for adapting to full load mode sets one-level or one-level flue gas described above
Pre-mixing apparatus.
Further, the flue gas pre-mixing apparatus is arranged in the horizontal flue in front of ammonia-gas spraying device flue gas direction of flow simultaneously
On the position of the ammonia-gas spraying device 10-15m.
Further, flue gas NO after described pre-mixing apparatusXConcentration distribution relative standard deviation≤5%, velocity of flue gas point
Cloth relative standard deviation≤5%.
The utility model compared with the existing technology has advantages below and effect：
1st, it is rational in infrastructure, install and easy to implement.
2nd, the full load mode adaptability of SCR denitration system ammonia-gas spraying device is greatly promoted.
3rd, denitration efficiency is further improved, and reduces the escaping of ammonia.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, before creative labor is not paid
Put, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of SCR denitration spray ammonia system schematic diagram for adapting to full load mode of the utility model.
Mark explanation：
1- flue gas pre-mixing apparatus 2- ammonia-gas spraying device 3- catalyst layer 4- flue 5- guiding devices
Embodiment
This patent is described in detail with reference to specific embodiment：
Embodiment 1, refer to Fig. 1, and the present embodiment includes flue 4 and set gradually along flue gas direction of advance
Flue gas pre-mixing apparatus 1, ammonia-gas spraying device 2, different from traditional SCR denitration system, the utility model is in SCR denitration system ammonia-gas spraying device
Preceding setting flue gas pre-mixing apparatus 1, disturbance mixing is carried out to flue gas before ammonia-gas spraying device 2 so that flue gas NO before spray ammoniaXConcentration and flue gas
VELOCITY DISTRIBUTION is more uniform, reduction flue gas NOXConcentration distribution relative standard deviation and velocity of flue gas distribution relative standard deviation, from
And lift the full load mode adaptability of SCR denitration system ammonia-gas spraying device.
Embodiment 2：In the present embodiment, flue gas pre-mixing apparatus 1 is circular discs static mixer, it would however also be possible to employ others ratio
Such as star-disc blender or dalta wing blender.
Embodiment 3：In the present embodiment, circular discs static mixer is arranged by 1-3, is often arranged 8-12 circular discs and is combined,
It is evenly arranged on the same section of the flue before ammonia-gas spraying device 4.
Embodiment 4：In the present embodiment, circular discs are using horizontal line as axle center, and with flue gas flow direction into 30-60 ° of angle.
Embodiment 5：In the present embodiment, flue gas pre-mixing apparatus 1 described in setting one-level can also set 2 as the case may be
Multi-stage flue gas pre-mixing apparatus 1 more than level.
Embodiment 6：In the present embodiment, flue gas pre-mixing apparatus 1 is arranged on the level in front of ammonia-gas spraying device flue gas direction of flow
In flue and on the position of the ammonia-gas spraying device 10-15m.
Embodiment 7：In the present embodiment, flue gas NO after pre-mixing apparatusXConcentration distribution relative standard deviation≤5%, flue gas speed
Degree distribution relative standard deviation≤5%.
Embodiment 8：In the present embodiment, the circular discs static mixer is made up of wear-resisting steel, and each disk diameter is
1m~1.5m, thickness is 10mm~20mm.
Furthermore, it is necessary to explanation, the specific embodiment described in this specification, is named the shape of its parts and components
Title etc. can be different.The equivalent or simple change that all construction, feature and principles according to described in the utility model inventional idea are done,
In the protection domain for being included in the utility model patent.The utility model person of ordinary skill in the field can be to being retouched
The specific embodiment stated is made various modifications or supplement or substituted using similar mode, without departing from the utility model
Structure or surmount scope defined in the claims, protection domain of the present utility model all should be belonged to.
Claims (8)
1. it is a kind of adapt to full load mode SCR denitration spray ammonia system, including flue and along flue gas direction of advance according to
Flue gas pre-mixing apparatus, the ammonia-gas spraying device of secondary setting, it is characterised in that described flue gas pre-mixing apparatus is arranged at before ammonia-gas spraying device
Side, disturbance premixing is carried out to flue gas before spray ammonia.
2. the SCR denitration spray ammonia system according to claim 1 for adapting to full load mode, it is characterised in that the cigarette
Gas pre-mixing apparatus is circular discs or star-disc static mixer.
3. the SCR denitration spray ammonia system according to claim 2 for adapting to full load mode, it is characterised in that the circle
Shape disk or star-disc static mixer are arranged by 1-3, often arrange 8-12 circular discs or star-disc is combined, be evenly arranged in spray ammonia
On the same section of flue before device.
4. the SCR denitration for the adapting to full load mode spray ammonia system according to Claims 2 or 3, it is characterised in that described
Circular discs static mixer is made up of wear-resisting steel, each a diameter of 1m~1.5m of circular discs, and thickness is 10mm~20mm.
5. the SCR denitration spray ammonia system according to claim 3 for adapting to full load mode, it is characterised in that described
Circular discs or star-disc are using horizontal line as axle center, and with flue gas flow direction into 30-60 ° of angle.
6. the SCR denitration for the adapting to full load mode spray ammonia system according to claim 1,2,3 or 5 any one, it is special
Levy and be, one-level or one-level flue gas pre-mixing apparatus described above are set.
7. the SCR denitration spray ammonia system according to claim 6 for adapting to full load mode, it is characterised in that the cigarette
Gas pre-mixing apparatus is arranged on the horizontal flue in front of ammonia-gas spraying device flue gas direction of flow Nei and apart from the ammonia-gas spraying device 10-15m
Position on.
8. the SCR denitration spray ammonia system according to claim 6 for adapting to full load mode, it is characterised in that described
Flue gas NO after pre-mixing apparatusXConcentration distribution relative standard deviation≤5%, velocity of flue gas distribution relative standard deviation≤5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621456544.XU CN206535429U (en) | 2016-12-28 | 2016-12-28 | A kind of SCR denitration spray ammonia system for adapting to full load mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621456544.XU CN206535429U (en) | 2016-12-28 | 2016-12-28 | A kind of SCR denitration spray ammonia system for adapting to full load mode |
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| Publication Number | Publication Date |
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| CN206535429U true CN206535429U (en) | 2017-10-03 |
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| CN201621456544.XU Active CN206535429U (en) | 2016-12-28 | 2016-12-28 | A kind of SCR denitration spray ammonia system for adapting to full load mode |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106823796A (en) * | 2016-12-28 | 2017-06-13 | 华电电力科学研究院 | A kind of SCR denitration spray ammonia system for adapting to full load mode |
| CN108786460A (en) * | 2018-08-09 | 2018-11-13 | 国电龙源节能技术有限公司 | Coal-burning power plant's denitration ammonia-gas spraying device flow fieldoptimization system |
-
2016
- 2016-12-28 CN CN201621456544.XU patent/CN206535429U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106823796A (en) * | 2016-12-28 | 2017-06-13 | 华电电力科学研究院 | A kind of SCR denitration spray ammonia system for adapting to full load mode |
| CN108786460A (en) * | 2018-08-09 | 2018-11-13 | 国电龙源节能技术有限公司 | Coal-burning power plant's denitration ammonia-gas spraying device flow fieldoptimization system |
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