CN106823796A - 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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- CN106823796A CN106823796A CN201611237698.4A CN201611237698A CN106823796A CN 106823796 A CN106823796 A CN 106823796A CN 201611237698 A CN201611237698 A CN 201611237698A CN 106823796 A CN106823796 A CN 106823796A
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- flue gas
- ammonia
- full load
- scr denitration
- load mode
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a kind of SCR denitration system for adapting to full load mode, flue gas pre-mixing apparatus are 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 NOx concentration and velocity of flue gas distribution are more uniform before spray ammonia, flue gas NOx concentration distribution relative standard deviation and velocity of flue gas distribution relative standard deviation are reduced, so as to lift the full load mode adaptability of SCR denitration system ammonia-gas spraying device.
Description
Technical field
The present invention relates to a kind of SCR denitrating flue gas spray ammonia system, particularly a kind of SCR denitration for adapting to full load mode
Spray ammonia system.
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 that reactor is arranged in the appropriate location of boiler back end ductwork, and in the presence of catalyst, 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 (80%~90% and more than) high, 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 mixes.
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 supply.But each of ammonia-spraying grid
Tube valve after certain regulating working conditions is finished, actual motion operation in not according to boiler load change after flue gas produce change
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
A series of problems, such as ease increases, its adaptability to boiler full load mode is poor.
Therefore, it is necessary to 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 by this invention is that conventional grates spray ammonia SCR system is easily caused catalyst inlet ammonia nitrogen mol ratio and differs
Cause, and then cause denitration efficiency to decline, the escaping of ammonia increases and the technical problem poor to the adaptability of boiler full load mode,
One kind is provided and adapts to full load mode, and further improve denitration efficiency, reduce the escaping of ammonia, and adapt to unit full load work
The SCR denitration spray ammonia system of condition.
A kind of SCR denitration spray ammonia system for adapting to full load mode of the present invention, including flue and along flue gas before
Enter flue gas pre-mixing apparatus, ammonia-gas spraying device that direction sets gradually, it is characterised in that described flue gas pre-mixing apparatus are arranged at spray ammonia
Device front, disturbance premixing is carried out to flue gas before spray ammonia.
Different from traditional SCR system, the present invention sets flue gas pre-mixing apparatus before ammonia-gas spraying device, to cigarette before ammonia-gas spraying device
Gas carries out disturbance mixing so that flue gas NO before spray ammoniaXConcentration and velocity of flue gas distribution are more uniform, reduce under various operating conditions
Flue gas NOXConcentration distribution relative standard deviation and velocity of flue gas distribution relative standard deviation, make ammonia-spraying grid each branch pipe penetrating
Reducing agent it is relatively uniform, and then the matching that each branch pipe subregion of ammonia-spraying grid sprays into reduction agent flux is greatly improved, so as to carry
Rise the full load mode adaptability of SCR denitration system ammonia-gas spraying device.
Further, the flue gas pre-mixing apparatus are 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, thick
It is 10mm~20mm to spend.
Further, described circular discs or star-disc be with 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 the above flue gas
Pre-mixing apparatus.
Further, the flue gas pre-mixing apparatus are arranged on the horizontal flue in front of ammonia-gas spraying device flue gas direction of flow Nei 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 present invention 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
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
Other accompanying drawings are obtained with 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 present invention.
Mark explanation：
1- flue gas pre-mixing apparatus 2- ammonia-gas spraying device 3- catalyst layer 4- flue 5- guiding devices
Specific 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 present invention sets before SCR denitration system ammonia-gas spraying device
Flue gas pre-mixing apparatus 1 are put, disturbance mixing is carried out to flue gas before ammonia-gas spraying device 2 so that flue gas NO before spray ammoniaXConcentration and velocity of flue gas
Distribution is more uniform, reduces flue gas NOXConcentration distribution relative standard deviation and velocity of flue gas distribution relative standard deviation, so as to carry
Rise 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 are 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 with 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 one-level are set, it is also possible to 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 are 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 with difference.The equivalent or simple change that all constructions according to described in inventional idea of the present invention, feature and principle are done, wraps
Include in the protection domain of patent of the present invention.Those skilled in the art can be to described specific implementation
Example is made various modifications or supplement or is substituted using similar mode, without departing from structure of the invention or surmounts this
Scope as defined in the claims, all should belong to protection scope of the present invention.
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
The flue gas pre-mixing apparatus of secondary setting, ammonia-gas spraying device, it is characterised in that before described flue gas pre-mixing apparatus are arranged at ammonia-gas spraying device
Side, disturbance premixing is carried out to flue gas before spray ammonia.
2. the SCR denitration for adapting to full load mode according to claim 1 sprays ammonia system, it is characterised in that the cigarette
Gas pre-mixing apparatus are circular discs or star-disc static mixer.
3. the SCR denitration for adapting to full load mode according to claim 2 sprays ammonia system, 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, and are evenly arranged in spray ammonia
On the same section of flue before device.
4. the SCR denitration for adapting to full load mode according to Claims 2 or 3 sprays ammonia system, it is characterised in that described
Circular discs static mixer is made up of wear-resisting steel, a diameter of 1m~1.5m of each circular discs, and thickness is 10mm~20mm.
5. the SCR denitration for adapting to full load mode according to claim 3 sprays ammonia system, it is characterised in that described
Circular discs or star-disc with horizontal line as axle center, and with flue gas flow direction into 30-60 ° of angle.
6. the SCR denitration for adapting to full load mode according to claim 1,2,3 or 5 any one sprays ammonia system, and it is special
Levy and be, one-level or one-level the above flue gas pre-mixing apparatus are set.
7. the SCR denitration for adapting to full load mode according to claim 6 sprays ammonia system, it is characterised in that the cigarette
Gas pre-mixing apparatus are 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 for adapting to full load mode according to claim 6 sprays ammonia system, 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 |
|---|---|---|---|
| CN201611237698.4A CN106823796A (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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611237698.4A CN106823796A (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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| CN106823796A true CN106823796A (en) | 2017-06-13 |
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| CN201611237698.4A Pending CN106823796A (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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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008143834A1 (en) * | 2007-05-18 | 2008-11-27 | Mccrometer, Inc. | Flow straightening apparatus |
| CN202983542U (en) * | 2012-11-21 | 2013-06-12 | 江苏中建材环保研究院有限公司 | Novel efficient silicon controlled rectifier (SCR) denitration deamination/smoke mixing device |
| CN103488824A (en) * | 2013-09-06 | 2014-01-01 | 广东电网公司电力科学研究院 | Field operation optimization method for SCR (selective catalytic reduction) denitration system |
| CN203725030U (en) * | 2014-03-12 | 2014-07-23 | 福建龙净环保股份有限公司 | SCR (Selective Catalytic Reduction) denitration system and ammonia spraying device thereof |
| CN206535429U (en) * | 2016-12-28 | 2017-10-03 | 华电电力科学研究院 | A kind of SCR denitration spray ammonia system for adapting to full load mode |
-
2016
- 2016-12-28 CN CN201611237698.4A patent/CN106823796A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008143834A1 (en) * | 2007-05-18 | 2008-11-27 | Mccrometer, Inc. | Flow straightening apparatus |
| CN202983542U (en) * | 2012-11-21 | 2013-06-12 | 江苏中建材环保研究院有限公司 | Novel efficient silicon controlled rectifier (SCR) denitration deamination/smoke mixing device |
| CN103488824A (en) * | 2013-09-06 | 2014-01-01 | 广东电网公司电力科学研究院 | Field operation optimization method for SCR (selective catalytic reduction) denitration system |
| CN203725030U (en) * | 2014-03-12 | 2014-07-23 | 福建龙净环保股份有限公司 | SCR (Selective Catalytic Reduction) denitration system and ammonia spraying device thereof |
| CN206535429U (en) * | 2016-12-28 | 2017-10-03 | 华电电力科学研究院 | A kind of SCR denitration spray ammonia system for adapting to full load mode |
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Application publication date: 20170613 |
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