CN105582808B - A kind of SCR denitration device and method - Google Patents
A kind of SCR denitration device and method Download PDFInfo
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- CN105582808B CN105582808B CN201610143114.0A CN201610143114A CN105582808B CN 105582808 B CN105582808 B CN 105582808B CN 201610143114 A CN201610143114 A CN 201610143114A CN 105582808 B CN105582808 B CN 105582808B
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- spray ammonia
- ammonia
- scr denitration
- flue
- pipeline
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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
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
-
- 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
- B01D53/76—Gas phase processes, e.g. by using aerosols
-
- 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
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
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- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of SCR denitration device and method.Wherein, SCR denitration device includes：Flue, has air inlet and gas outlet, and flue gas flows to the gas outlet from the air inlet；At least one spray ammonia pipe layers, the spray ammonia pipe layers include multiple spray ammonia pipelines, and there is gap between the adjacent spray ammonia pipeline, circulating direction of the width in the gap along the flue gas first reduces to be increased afterwards, and the spray ammonia pipeline is provided with multiple spray ammonia holes towards the side wall in the gap；The spray ammonia pipe layers are located in the flue, and the flue gas in the flue sprays ammonia pipe layers through the gap through described.The SCR denitration method step of the present invention is succinct, and SCR denitration device is simple in construction, it is not necessary to sets Venturi tube in addition, can optimizes the mixed effect of flue gas and ammonia, and shortens mixing distance, reduces operation pressure drop, so as to further save the energy, fume treatment cost is reduced.
Description
Technical field
The present invention relates to smoke eliminator structure and the technical field of method, espespecially a kind of SCR denitration device and method.
Background technology
With expanding economy, the usage amount of the fossil fuel such as coal, oil, natural gas increases year by year, the production of nitrogen oxides
Raw amount is consequently increased, the larger pressure that Which Ecological Environment Faced deteriorates.SCR (Selective Catalytic Reduction,
SCR technology) as a kind of optimal feasible denitration technology, be widely used to thermoelectricity, petrochemical industry, cement, glass and
In the denitration process of tail gas/flue gas of the industries such as steel.
The same tail gas of ammonia/flue gas mixing uniformity directly affects the denitration efficiency and the escaping of ammonia of SCR denitration device.Tradition
SCR denitration device includes flue and ammonia-gas spraying device, and ammonia-gas spraying device is typically designed using grating type, and grid pipeline is evenly arranged in cigarette
In road section, multiple spray ammonia branched pipes are connected on each grid pipeline, branched pipe is provided with spray-hole, so as to which ammonia be ejected into
In tail gas/flue gas；To strengthen mixed effect, the downstream of grid pipeline is typically provided static mixing blade or sets vortex mixing
Device, but the ammonia-gas spraying device of this form makes the mixing distance of ammonia and tail gas/flue gas longer, and set hybrid blade to cause to press
Drop larger, mixed effect is also preferable not to the utmost.With requirement more and more higher of the China to discharged nitrous oxides index, existing SCR
The denitration efficiency of denitrification apparatus needs further to improve.
In order to solve the above technical problems, the applicant is directed to providing a kind of new SCR denitration device and method.
The content of the invention
It is an object of the invention to provide a kind of SCR denitration device and method, and wherein SCR denitration device is simple in construction, convenient
Installation and removal, flue gas can be made to be realized with ammonia and sufficiently mixed, so as to improve the denitration efficiency of SCR denitration device, drop
Low the escaping of ammonia rate.
In order to solve the above technical problems, the invention provides a kind of SCR denitration device, including：Flue, have air inlet and
Gas outlet, flue gas flow to the gas outlet from the air inlet；At least one spray ammonia pipe layers, the spray ammonia pipe layers include more
Individual spray ammonia pipeline, and has gap between the adjacent spray ammonia pipeline, the circulation of the width in the gap along the flue gas
Direction first reduces and increased afterwards, and the spray ammonia pipeline is provided with multiple spray ammonia holes towards the side wall in the gap；The spray ammonia pipe
Channel layer is located in the flue, and the flue gas in the flue sprays ammonia pipe layers through the gap through described.
Preferably, the number of the spray ammonia pipe layers is multilayer.
Preferably, in the spray ammonia pipe layers, the axis of the spray ammonia pipeline is respectively positioned on same plane.
Preferably, the spray ammonia pipe layers are vertical with the flue.
Preferably, in every layer of spray ammonia pipe layers, the spray ammonia hole position on the spray ammonia pipeline is in the spray ammonia pipe
On the first side wall in road, the first side wall for spraying ammonia pipeline is the spray ammonia pipeline close to the side of the gas outlet of the flue
Wall.
Preferably, in every layer of spray ammonia pipe layers, caliber where the spray ammonia hole of the spray ammonia pipeline with it is described
The angle of plane is 0~30 ° where spraying the axis of ammonia pipeline.
Preferably, the cross section of the spray ammonia pipeline is ellipse.
Preferably, the cross section of the spray ammonia pipeline is circle.
Preferably, a diameter of 25~80mm of the spray ammonia pipeline.
The invention also discloses a kind of SCR denitration method applied to above-mentioned SCR denitration device, including step：
S10：Flue gas is set to pass through the gap in the spray ammonia pipe layers in the flue；
S20：Ammonia is set to be sprayed from the spray ammonia hole of the spray ammonia pipeline, the ammonia is with the flue gas described
Mixed in gap.
The SCR denitration device and method of the present invention can realize following any one beneficial effect.
1st, ammonia pipeline is sprayed in SCR denitration device of the invention to spray into the gap between spray ammonia pipeline by spraying ammonia hole
Ammonia, flue gas mix by the gap between spraying ammonia pipeline and with ammonia, and flue gas is by the venturi tubulose between spray ammonia pipeline
Gap when, its flow velocity gradually increases in the flaring part in gap, and at the minimum of gap, and flow velocity reaches maximum (typically quilt
Accelerate to 3~4 times of former flow velocity), and flue gas stream rapids rushes intensity and greatly enhanced, and the gap aditus laryngis of venturi tubulose is short, resistance
Power is small, and tapered portion of the flow velocity of flue gas in gap is gradually reduced, and it can be seen from hydrodynamics, flue gas and ammonia are in Wen Qiu
In tubulose gap in mixed effect it is preferable, and flue gas and ammonia mixing distance it is shorter, operation pressure drop it is relatively low, so as to enter one
Step has saved the energy, reduces fume treatment cost；And the SCR denitration device of the present invention need not set venturi in addition
Pipe, but the gap between the side wall by spraying ammonia pipeline forms the gap of venturi tubulose, so as to simplify apparatus structure, enters
One step reduces the input cost of equipment；
2nd, SCR denitration device of the invention is provided with individual layer spray ammonia pipe layers, sprays the axis that ammonia pipeline is sprayed in ammonia pipe layers
It is respectively positioned on same plane, and spray ammonia pipe layers are vertical with flue, in this way, the flue gas in flue can be made perpendicular through spray
Ammonia pipe layers, so that the mixed effect of ammonia and flue gas is more preferable；
3rd, the spray ammonia hole that ammonia pipeline is sprayed in SCR denitration device of the invention is arranged on spray ammonia pipeline close to flue gas outlet
And towards in the side wall in the gap of venturi tubulose, and spray the caliber where ammonia hole and plane where the axis of spray ammonia pipeline
Angle be 0~30 °, understand that the flow velocity of flue gas stream here is big through hydrodynamics, rapids punching is strong, and pressure is low, flue gas with
The mixed effect of ammonia is more preferable；
4th, the cross section that ammonia pipeline is sprayed in SCR denitration device of the invention is circle, and spray the radius of ammonia pipeline for 25~
80mm, when so setting, the mixed effect of ammonia and flue gas is more preferable；
5th, SCR denitration method operating procedure of the invention is simple, the good mixing effect of flue gas and ammonia, effectively improves
SCR denitration efficiency, reduce denitration cost.
Brief description of the drawings
The present invention is described in further detail with reference to the accompanying drawings and detailed description：
Fig. 1 is a kind of top view of specific embodiment of the SCR denitration device of the present invention；
Fig. 2 is sectional view of the SCR denitration device shown in Fig. 1 in A-A directions；
Fig. 3 is the structure mplifying structure schematic diagram at the B shown in Fig. 2.
Drawing reference numeral explanation：
Flue 10；Spray ammonia pipeline 20, spray ammonia hole 21；Gap 30；Included angle B.
Embodiment
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
There is the required accompanying drawing used in technology description to be 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, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
It is the specific embodiment of the SCR denitration device of the present invention below.
Embodiment one
Embodiment discloses a kind of SCR denitration device, including：Flue, has air inlet and a gas outlet, and flue gas is from air inlet
Gas outlet is flowed to, flue gas flow rate is generally 10~18m/s；At least one spray ammonia pipe layers, spray ammonia pipe layers include multiple spray ammonia
Pipeline, and have gap between adjacent spray ammonia pipeline, the circulating direction of the width in gap along flue gas first reduces to be increased afterwards, is sprayed
Ammonia pipeline is provided with multiple spray ammonia holes towards the side wall in gap；Spray ammonia pipe layers are located in flue, and the flue gas in flue
Spray ammonia pipe layers are passed through through gap.
Ammonia pipeline is sprayed in the SCR denitration device of the present invention and sprays ammonia into the gap between spray ammonia pipeline by spraying ammonia hole
Gas, flue gas mix by the gap between spraying ammonia pipeline and with ammonia, and flue gas is by the venturi tubulose between spray ammonia pipeline
During gap, its flow velocity gradually increases in the flaring part in gap, and at the minimum of gap, flow velocity reaches maximum and (typically added
Speed is to 3~4 times) greatly enhanced so that flue gas stream rapids rushes intensity, in addition, the aditus laryngis in the gap of venturi tubulose is short, resistance
It is small, and tapered portion of the flow velocity of flue gas in gap is gradually reduced.
It can be seen from hydrodynamics, flue gas and ammonia mixed effect in the gap of venturi tubulose are preferable, and flue gas
With the mixing Distance Shortened of ammonia, operation pressure drop reduces, and so as to further save the energy, reduces fume treatment cost；And
And the SCR denitration device of the present invention need not set Venturi tube in addition, but the gap between the side wall by spraying ammonia pipeline
The gap of venturi tubulose is formed, so as to simplify apparatus structure, reduce further the input cost of equipment
Embodiment two
As shown in Figure 1, Figure 2 and Figure 3, embodiment two is a kind of more preferable implementation of the SCR denitration device of the present invention
Example, including：Flue 10, has air inlet and a gas outlet, and flue gas flows to gas outlet from air inlet, and flue gas flow rate is generally 10~
18m/s；One spray ammonia pipe layers, spray ammonia pipe layers include multiple spray ammonia pipelines 20, and have between adjacent spray ammonia pipeline 20
Gap 30, the circulating direction (direction of arrow namely shown in Fig. 2) of the width in gap 30 along flue gas first reduces to be increased afterwards,
Spray ammonia pipeline 20 and be provided with multiple spray ammonia holes 21 towards the side wall in gap；Spray ammonia pipe layers are located in flue 10, and flue
Flue gas in 10 passes through spray ammonia pipe layers through gap.
As shown in Fig. 2 the number that ammonia pipe layers are sprayed in SCR denitration device is one layer；In every layer sprays ammonia pipe layers, ammonia is sprayed
The axis of pipeline 20 is respectively positioned on same plane；And spray ammonia pipe layers are vertical with flue 10.
As shown in figure 3, in every layer sprays ammonia pipe layers, the spray ammonia hole 21 on spray ammonia pipeline 20 is positioned at spray ammonia pipeline 21
On the first side wall, the first side wall of spray ammonia pipeline 20 is sprays side wall of the ammonia pipeline close to the gas outlet of flue, i.e., shown in Fig. 3
Spray side wall of the ammonia pipeline 20 in first quartile.Also, in every layer sprays ammonia pipe layers, the spray ammonia hole 21 of spray ammonia pipeline 20
The included angle B of the caliber at place and plane where the axis of spray ammonia pipeline 20 is 30 °.
Specifically, the cross section of spray ammonia pipeline 20 is circle, and its a diameter of 45mm.
Certainly, in other embodiments, the number for ammonia pipe layers being sprayed in SCR denitration device of the invention can also be set to more
Layer；Spray ammonia pipe layers slightly obliquely or inclined can also be arranged in flue；The cross section of spray ammonia pipeline can also be set to
Ellipse；The diameter optimal selection scope of spray ammonia pipeline is 25~80mm, such as 25mm, 30mm, 35mm, 50mm or 80mm
Deng, naturally it is also possible to it is set to other sizes；Caliber where the spray ammonia hole of spray ammonia pipeline where the axis of spray ammonia pipeline with putting down
The angle optimal selection in face is 0~30 °, such as 0 °, 10 °, 15 °, 20 ° or 25 ° etc., naturally it is also possible to is set to 40 °, 45 °, 50 °
Or 55 ° etc.；In addition, the size and number of the spray ammonia pipeline in the spray ammonia pipe layers of the present invention can be according to the need of Practical Project
It is adjusted, here is omitted.
It is the specific embodiment of the SCR denitration method of the present invention below.
Embodiment one
The invention also discloses a kind of SCR denitration method applied to above-mentioned SCR denitration device, including step：
S10：Flue gas is set to pass through the gap in the spray ammonia pipe layers in flue；
S20：Ammonia is set to be sprayed from the spray ammonia hole of spray ammonia pipeline, ammonia mixes with flue gas in gap.
Exemplary, as shown in Fig. 2 the concrete application situation of the embodiment two of the SCR denitration device of the present invention is as follows：
One layer of spray ammonia pipe layers are arranged in flue 10, formed with literary mound between the spray ammonia pipeline 20 in spray ammonia pipe layers
In tubulose gap 30, flue gas stream is vertically through spray ammonia pipe layers, and the flow velocity of flue gas is in the gap 30 of venturi tubulose
Middle first increases and then decreases, while spray ammonia pipeline 20 and spray ammonia into gap 30 by spraying ammonia hole 21, wherein spray ammonia hole 21
Towards the converging transition part in gap 30, according to hydrodynamics, the flow velocity of flue gas stream is big herein, and rapids punching is strong, and pressure is low, cigarette
The good mixing effect of gas and ammonia.
The SCR denitration device of the present invention is simple in construction, by spraying ammonia pipeline and spraying the ingenious setting in ammonia hole, makes ammonia
Preferable mixed effect can be realized with flue gas, while reduces the mixing distance of ammonia and flue gas, reduce further operation
Pressure drop, so as to realize more preferable SCR denitration effect, and reduce processing cost.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (8)
- A kind of 1. SCR denitration device, it is characterised in that including：Flue, has air inlet and gas outlet, and flue gas flows to the gas outlet from the air inlet；At least one spray ammonia pipe layers, the spray ammonia pipe layers include multiple spray ammonia pipelines, and the adjacent spray ammonia pipeline it Between there is gap, the circulating direction of the width in the gap along the flue gas first reduces to be increased afterwards, the spray ammonia pipeline direction The side wall in the gap is provided with multiple spray ammonia holes；The spray ammonia pipe layers are located in the flue, and the flue gas in the flue sprays ammonia pipe through the gap through described Channel layer；The number of the spray ammonia pipe layers is multilayer；In every layer of spray ammonia pipe layers, the axis of the spray ammonia pipeline is respectively positioned on same plane.
- 2. SCR denitration device as claimed in claim 1, it is characterised in that：The spray ammonia pipe layers are vertical with the flue.
- 3. SCR denitration device as claimed in claim 1, it is characterised in that：In every layer of spray ammonia pipe layers, the spray ammonia hole position on the spray ammonia pipeline is in the first side wall of the spray ammonia pipeline On, the first side wall of the spray ammonia pipeline is the side wall for spraying ammonia pipeline close to the gas outlet of the flue.
- 4. SCR denitration device as claimed in claim 3, it is characterised in that：In every layer of spray ammonia pipe layers, the axle of caliber and the spray ammonia pipeline where the spray ammonia hole of the spray ammonia pipeline The angle of plane is 0~30 ° where line.
- 5. the SCR denitration device as described in any one of Claims 1-4, it is characterised in that：The cross section of the spray ammonia pipeline is ellipse.
- 6. the SCR denitration device as described in any one of Claims 1-4, it is characterised in that：The cross section of the spray ammonia pipeline is circle.
- 7. SCR denitration device as claimed in claim 6, it is characterised in that：A diameter of 25~80mm of the spray ammonia pipeline.
- 8. a kind of SCR denitration method, it is characterised in that the SCR denitration method is applied to any one in claim 1 to 7 Described SCR denitration device, including step：S10：Flue gas is set to pass through the gap in the spray ammonia pipe layers in the flue；S20：Ammonia is set to be sprayed from the spray ammonia hole of the spray ammonia pipeline, the ammonia is with the flue gas in the gap Middle mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610143114.0A CN105582808B (en) | 2016-03-14 | 2016-03-14 | A kind of SCR denitration device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610143114.0A CN105582808B (en) | 2016-03-14 | 2016-03-14 | A kind of SCR denitration device and method |
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| CN105582808A CN105582808A (en) | 2016-05-18 |
| CN105582808B true CN105582808B (en) | 2017-11-24 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112870960A (en) * | 2021-03-19 | 2021-06-01 | 中国华电科工集团有限公司 | Ammonia spraying device and flue gas denitration device |
| CN113877399A (en) * | 2021-08-16 | 2022-01-04 | 华能国际电力股份有限公司大连电厂 | Load optimization system or thermoelectric load optimization method |
| CN116036853A (en) * | 2021-10-28 | 2023-05-02 | 中国石油化工股份有限公司 | Flue gas denitration ammonia spraying mixed dust removal equipment and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0788324A (en) * | 1993-09-21 | 1995-04-04 | Furukawa Co Ltd | Waste gas treating device |
| CN201394414Y (en) * | 2009-05-09 | 2010-02-03 | 江苏中科节能环保技术有限公司 | Injection ammonia-spray mixing mechanism of SCR reaction device |
| CN201632195U (en) * | 2010-04-06 | 2010-11-17 | 东南大学 | Fume denitration device with ammonia injection grid having regulation capability |
| CN205386409U (en) * | 2016-03-14 | 2016-07-20 | 上海蓝科石化环保科技股份有限公司 | SCR (selective catalytic reduction) denitration device |
-
2016
- 2016-03-14 CN CN201610143114.0A patent/CN105582808B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0788324A (en) * | 1993-09-21 | 1995-04-04 | Furukawa Co Ltd | Waste gas treating device |
| CN201394414Y (en) * | 2009-05-09 | 2010-02-03 | 江苏中科节能环保技术有限公司 | Injection ammonia-spray mixing mechanism of SCR reaction device |
| CN201632195U (en) * | 2010-04-06 | 2010-11-17 | 东南大学 | Fume denitration device with ammonia injection grid having regulation capability |
| CN205386409U (en) * | 2016-03-14 | 2016-07-20 | 上海蓝科石化环保科技股份有限公司 | SCR (selective catalytic reduction) denitration device |
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