CN107537336B - SCR method denitration flue gas blender - Google Patents
SCR method denitration flue gas blender Download PDFInfo
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- CN107537336B CN107537336B CN201710945353.2A CN201710945353A CN107537336B CN 107537336 B CN107537336 B CN 107537336B CN 201710945353 A CN201710945353 A CN 201710945353A CN 107537336 B CN107537336 B CN 107537336B
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- annular supporting
- mixed flow
- flue gas
- assemblies
- flue
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000003546 flue gas Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000000712 assembly Effects 0.000 claims abstract description 42
- 238000000429 assembly Methods 0.000 claims abstract description 42
- 230000007423 decrease Effects 0.000 claims abstract description 8
- 230000004323 axial length Effects 0.000 claims description 22
- 239000000779 smoke Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The invention discloses a flue gas mixer, in particular to a flue gas mixer for denitration by an SCR method. The flue gas treatment device comprises at least two annular supporting assemblies (1) which are coaxially arranged, wherein the circumferential area of each annular supporting assembly (1) gradually decreases from front to back along the flow direction of flue gas, and adjacent annular supporting assemblies (1) are connected through a group of mixed flow plate assemblies (2). The outer surface of the annular supporting component (1) with the largest circumferential area is fixedly connected with the flue. The device enables the flue gas to be uniformly mixed in full cross section, further improves the non-uniformity of the flue gas in the flue, and improves the denitration effect.
Description
Technical Field
The invention relates to a flue gas mixer, in particular to a flue gas mixer for denitration by an SCR method.
Background
The SCR method is a selective catalytic reduction reaction, namely, a reducing agent is sprayed into a flue to be fully mixed with the flue gas, and enters a downstream denitration reactor to remove nitrogen oxides in the flue gas under the catalysis of a catalyst, so that nitrogen and water are generated. Because the injection quantity of the reducing agent is small, and the section of the flue is large, the flue gas and the reducing agent are difficult to fully mix, so that the uniformity of inlet flow fields of the denitration reactor and the catalyst is poor. In the prior art, a flue gas mixer is generally added to improve the uniformity of a flue, but most of traditional flue gas mixers are in a form of local turbulence or integral flow guide, so that local flue gas can be uniformly mixed, full-section uniform mixing cannot be achieved, and the denitration effect is affected.
Disclosure of Invention
The invention aims to provide an SCR method denitration flue gas mixer, which enables flue gas to be uniformly mixed in a full cross section, further improves the non-uniformity of flue gas in a flue, and improves the denitration effect.
In order to solve the technical problems, the invention adopts the following technical scheme:
an SCR process denitration flue gas mixer includes at least two coaxially arranged annular support members whose circumferential area gradually decreases from front to back in the flow direction of flue gas. The cross section of the annular supporting component is a circular surface, and the annular supporting component is coaxially arranged front and back. The adjacent annular supporting components are connected through a group of mixed flow plate components. The outer surface of the annular supporting component with the largest circumferential area is fixedly connected with the flue, so that the mixed flow plate component forms a multi-layer curved surface structure on the flue.
Each group of mixed flow plate assemblies comprises a plurality of mixed flow plates, the mixed flow plates are radially arranged by taking the axle center of the annular supporting assembly as the center, and an angle alpha is formed between the mixed flow plates and the cross section of the flue. The cross section of the flue is divided into the areas with the expansion angles by the mixed flow plate assembly, so that the flue gas passes through the mixed flow plate to form a rotary flow mode, and the non-uniformity of the flue gas in the flue can be improved.
Further, the angle alpha between the mixed flow plate and the cross section of the flue is 15-60 degrees.
The mixing plates in each set of mixing plate assemblies described above are equally spaced, i.e., equally distributed over the circumference.
Advantageously, the number of mixing plates in each set of mixing plate assemblies is 3-12.
The projection length of the mixed flow plate on the axial direction of the flue is 100 mm-500 mm.
The number of the annular supporting assemblies is four, and the number of the mixed flow plate assemblies is three, namely, two adjacent groups of annular supporting assemblies are connected through one group of mixed flow plate assemblies.
The annular supporting component and the mixed flow plate component are of an integrated structure, namely, the mixed flow plate component is connected into a whole through the annular supporting component. The whole assembly is completed by welding the outer surface of the outermost annular supporting component, namely the annular supporting component with the largest circumferential area, with the flue, and the installation is simple.
Furthermore, the mixed flow plate is arc-shaped, so that the mixed flow plate is spirally arranged between the annular supporting components, and the flue gas passes through the mixed flow plate to form a rotary flow mode, so that the non-uniformity of the flue gas in the flue is further improved.
The axial length of the annular supporting component is 100-1500 mm. Specifically, the axial length of the annular supporting component with the largest circumferential area can be 100-1500 mm, and the axial lengths of other annular supporting components are 100-500 mm. The axial length of the annular supporting component with the largest circumferential area can be 100-500 mm, and the axial lengths of other annular supporting components are 100-500 mm.
Compared with the prior art, the invention has the following advantages: the annular supporting component is coaxially arranged front and back, the mixed flow plate is spirally arranged on the circumferential surface of the annular supporting component, a spiral mixer with positive rotation and reverse rotation is formed, and the smoke can be mixed up, down, left and right by 360 degrees, so that the smoke is mixed without dead angles, and the smoke can be uniformly mixed in a full section. The ammonia nitrogen molar ratio can be improved, ammonia and nitrogen are fully mixed under the condition of fully turbulent flow of flue gas, the traditional deviation of the mixing uniformity of the ammonia nitrogen molar ratio is reduced, the traditional deviation of the temperature mixing uniformity is also reduced, and compared with a traditional mixer, the denitration efficiency of the device can be improved by 7%.
The mixed flow plate assembly is fixedly connected into a whole through the annular supporting assembly, the whole outer surface of the annular supporting assembly with the largest circumferential area is welded with the flue, the installation is simple, the mixed flow plate forms a multi-layer curved surface structure on the flue, the cross section of the flue is divided into areas with different expansion angles, the flue gas passes through the mixed flow plate to form a rotary flow mode, and the non-uniformity of the flue gas inside the flue can be improved. The device mixes structural style that flow plate assembly and annular supporting component combined together can guarantee the intensity of flue, has saved the internal support of flue.
Drawings
FIG. 1 is a perspective view of the present invention;
FIG. 2 is a front view of the present invention in the direction of the flue gas flow;
FIG. 3 is a perspective view of one annular support assembly of the present invention;
FIG. 4 is a schematic view showing the effect of example 3;
fig. 5 is another effect schematic of example 3.
Meaning of reference numerals: 1-annular supporting component, 2-mixed flow plate component and 201-mixed flow plate.
The invention is further described below with reference to the drawings and the detailed description.
Description of the embodiments
Example 1 of the present invention: as shown in fig. 1 to 3, an SCR method denitration flue gas mixer includes at least two coaxially arranged annular support members 1, and the circumferential area of the annular support members 1 gradually decreases from front to back along the flow direction of flue gas. The cross section of the annular supporting component 1 is a circular surface, and the annular supporting component 1 is coaxially arranged front and back. The adjacent annular supporting components 1 are connected through a group of mixed flow plate components 2. The outer surface of the annular supporting component 1 with the largest circumferential area is fixedly connected with the flue, so that the mixed flow plate component 2 forms a multi-layer curved surface structure on the flue. The annular supporting component 1 and the mixed flow plate component 2 are of an integrated structure, namely, the mixed flow plate component 2 is connected into a whole through the annular supporting component 1. The whole body of the circular support assembly is welded with the flue through the outermost circular support assembly 1, namely, the outer surface of the circular support assembly 1 with the largest circumferential area.
Example 2: as shown in fig. 1 to 3, an SCR method denitration flue gas mixer includes at least two coaxially arranged annular support members 1, and the circumferential area of the annular support members 1 gradually decreases from front to back along the flow direction of flue gas. The cross section of the annular supporting component 1 is a circular surface, and the annular supporting component 1 is coaxially arranged front and back. The adjacent annular supporting components 1 are connected through a group of mixed flow plate components 2. The outer surface of the annular supporting component 1 with the largest circumferential area is fixedly connected with the flue, so that the mixed flow plate component 2 forms a multi-layer curved surface structure on the flue. Wherein the number of the mixing plates 201 in each group of the mixing plate assemblies 2 is 3 to 12. The mixed flow plate 201 is radially arranged by taking the axle center of the annular supporting component 1 as the center, and an angle alpha is formed between the mixed flow plate 201 and the cross section of the flue, and the angle alpha is 15-60 degrees. The mixing plates 201 in each set of mixing plate assemblies 2 are equally spaced, i.e. equally distributed over the circumference. The projection length of the mixed flow plate 201 in the flue axis is 100 mm-500 mm. The cross section of the flue is divided into the areas with the expansion angles by the mixed flow plate assembly 2, so that the flue gas passes through the mixed flow plate 201 to form a rotary flow mode, and the non-uniformity of the flue gas in the flue can be improved. Further, the number of the annular supporting assemblies 1 is four, and the number of the mixed flow plate assemblies 2 is three, namely, two adjacent groups of annular supporting assemblies 1 are connected through one group of mixed flow plate assemblies 2. Specifically, the mixed flow plate 201 is in a circular arc shape, so that the mixed flow plate 201 is spirally arranged between the annular supporting components 1, and the flue gas passes through the mixed flow plate 201 to form a rotary flow mode, so that the non-uniformity of the flue gas in the flue is further improved. The axial length of the annular supporting component 1 is 100-1500 mm. Specifically, the axial length of the annular supporting component 1 with the largest circumferential area can be 100-1500 mm, and the axial lengths of other annular supporting components 1 can be 100-500 mm. The axial length of the annular supporting component 1 with the largest circumferential area can be 100-500 mm, and the axial length of other annular supporting components 1 can be 100-500 mm.
Example 3: as shown in fig. 1 to 5, an SCR denitration flue gas mixer includes four coaxially arranged annular support members 1, and the circumferential area of the annular support members 1 gradually decreases from front to back along the flow direction of flue gas. The cross section of the annular supporting component 1 is a circular surface, and the annular supporting component 1 is coaxially arranged front and back. Wherein, the axial length of the first annular supporting component 1 at the forefront is 1500 mm, the axial length of the second annular supporting component 1 is 500mm, the axial length of the third annular supporting component 1 is 500mm, and the axial length of the fourth annular supporting component 1 at the rearmost is 500mm. The adjacent annular support assemblies 1 are connected through a group of mixed flow plate assemblies 2, namely the number of the mixed flow plate assemblies 2 is three. The projected length of the mixed flow plate 201 in the flue axis direction is 500mm. The outer surface of the annular supporting component 1 with the largest circumferential area is welded with the flue.
Specifically, the mixed flow plate assembly 2 between the first annular supporting assembly 1 and the second annular supporting assembly 1 includes 12 mixed flow plates 201, the mixed flow plate assembly 2 between the second annular supporting assembly 1 and the third annular supporting assembly 1 includes 8 mixed flow plates 201, and the mixed flow plate assembly 2 between the third annular supporting assembly 1 and the fourth annular supporting assembly 1 includes 6 mixed flow plates 201. The mixed flow plates 201 are radially arranged with the axle center of the annular supporting component 1 as the center, and an angle alpha is formed between the mixed flow plates 201 and the cross section of the flue, and the angle alpha is 45 degrees. The mixing plates 201 in each set of mixing plate assemblies 2 are equally spaced, i.e. equally distributed over the circumference. Further, the mixed flow plate 201 is in a circular arc shape, so that the mixed flow plate 201 is spirally arranged between the annular support assemblies 1, the cross section of the flue is divided into areas with expansion angles by the mixed flow plate assemblies 2, the mixed flow plate assemblies 2 form a multi-layer curved surface structure on the flue, and the flue gas passes through the mixed flow plate 201 to form a rotary flow mode, so that the non-uniformity of the flue gas in the flue can be improved. As shown in fig. 4 and 5, the device can greatly improve the relative mixing uniformity of the flue gas, and has the greatest advantages that the effect of improving the ammonia nitrogen molar ratio is obvious: under the condition of fully turbulent flow of the flue gas, ammonia and nitrogen are fully mixed, so that the ammonia nitrogen molar ratio is improved to about 4% from about 10% of the average deviation of the traditional mixing uniformity; the temperature deviation is improved to about 8 ℃ from about 20 ℃ of the traditional mixing uniformity deviation, and the denitration efficiency is greatly improved.
Example 4: as shown in fig. 1 to 3, an SCR denitration flue gas mixer includes four coaxially arranged annular support members 1, and the circumferential area of the annular support members 1 gradually decreases from front to back along the flow direction of flue gas. The cross section of the annular supporting component 1 is a circular surface, and the annular supporting component 1 is coaxially arranged front and back. Wherein, the axial length of the first annular supporting component 1 at the forefront is 500mm, the axial length of the second annular supporting component 1 is 100mm, the axial length of the third annular supporting component 1 is 100mm, and the axial length of the fourth annular supporting component 1 at the rearmost is 100mm. The adjacent annular support assemblies 1 are connected through a group of mixed flow plate assemblies 2, namely the number of the mixed flow plate assemblies 2 is three. The projected length of the mixed flow plate 201 in the flue axis direction is 100mm. The outer surface of the annular supporting component 1 with the largest circumferential area is welded with the flue.
Specifically, the mixed flow plate assembly 2 between the first annular supporting assembly 1 and the second annular supporting assembly 1 includes 10 mixed flow plates 201, the mixed flow plate assembly 2 between the second annular supporting assembly 1 and the third annular supporting assembly 1 includes 6 mixed flow plates 201, and the mixed flow plate assembly 2 between the third annular supporting assembly 1 and the fourth annular supporting assembly 1 includes 3 mixed flow plates 201. The mixed flow plates 201 are radially arranged with the axle center of the annular supporting component 1 as the center, and an angle alpha is formed between the mixed flow plates 201 and the cross section of the flue, and the angle alpha is 30 degrees. The mixing plates 201 in each set of mixing plate assemblies 2 are equally spaced, i.e. equally distributed over the circumference. Further, the mixed flow plate 201 is in a circular arc shape, so that the mixed flow plate 201 is spirally arranged between the annular support assemblies 1, the cross section of the flue is divided into areas with expansion angles by the mixed flow plate assemblies 2, the mixed flow plate assemblies 2 form a multi-layer curved surface structure on the flue, and the flue gas passes through the mixed flow plate 201 to form a rotary flow mode, so that the non-uniformity of the flue gas in the flue can be improved.
The working process of the invention comprises the following steps: the annular supporting components 1 are coaxially arranged front and back, the mixed flow plates 201 are spirally arranged on the circumferential surface of the annular supporting components 1, the mixed flow plate components 2 are fixedly connected into a whole through the annular supporting components 1, and the whole passes through the outermost annular supporting components 1, namely the outer surface of the annular supporting component 1 with the largest circumferential area is welded with the flue. The mixed flow plate 201 forms a multi-layer curved surface structure on the flue, the cross section of the flue is divided into areas with different expansion angles, and the flue gas passes through the mixed flow plate 201 to form a rotary flow mode, so that the non-uniformity of the flue gas in the flue can be improved.
Claims (4)
1. The SCR method denitration flue gas mixer is characterized by comprising at least two coaxially arranged annular support assemblies (1), wherein the circumferential area of each annular support assembly (1) gradually decreases from front to back along the flow direction of flue gas, and adjacent annular support assemblies (1) are connected through a group of mixed flow plate assemblies (2); the outer surface of the annular supporting component (1) with the largest circumferential area is fixedly connected with the flue; each group of mixed flow plate assemblies (2) comprises a plurality of mixed flow plates (201), the mixed flow plates (201) are radially arranged by taking the axle center of the annular supporting assembly (1) as the center, and an angle alpha is formed between the mixed flow plates (201) and the cross section of the flue; the angle alpha is 15-60 degrees; the annular supporting component (1) and the mixed flow plate component (2) are of an integrated structure; the number of the annular supporting assemblies (1) is four, the number of the mixed flow plate assemblies (2) is three, the circumferential area of each annular supporting assembly (1) gradually decreases from front to back along the flow direction of the flue gas, the cross sections of the annular supporting assemblies (1) are circular surfaces, the annular supporting assemblies (1) are coaxially arranged front and back, the axial length of the first annular supporting assembly (1) at the forefront is 1500 mm, the axial length of the second annular supporting assembly (1) is 500mm, the axial length of the third annular supporting assembly (1) is 500mm, the axial length of the fourth annular supporting assembly (1) at the rearmost side is 500mm, the adjacent annular supporting assemblies (1) are connected through a group of mixed flow plate assemblies (2), the projection length of each mixed flow plate (201) in the axial direction of the flue is 500mm, and the outer surface of the annular supporting assembly (1) with the largest circumferential area is welded with the flue; the mixed flow plate assembly (2) is spirally arranged on the circumferential surface of the annular supporting assembly (1) to form a spiral mixer with positive rotation and negative rotation, so that the smoke can be mixed up, down, left and right by 360 degrees, the smoke is mixed without dead angles, and the smoke can be uniformly mixed in a full section.
2. An SCR process denitration flue gas mixer according to claim 1, wherein the flow mixing plates (201) in each set of flow mixing plate assemblies (2) are arranged at equal intervals.
3. An SCR process denitration flue gas mixer according to claim 1, wherein the number of mixing plates (201) in each set of mixing plate assemblies (2) is 3 to 12.
4. The SCR process denitration flue gas mixer according to claim 1, wherein the mixed flow plate (201) has a circular arc shape.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710945353.2A CN107537336B (en) | 2017-10-12 | 2017-10-12 | SCR method denitration flue gas blender |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710945353.2A CN107537336B (en) | 2017-10-12 | 2017-10-12 | SCR method denitration flue gas blender |
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| CN107537336A CN107537336A (en) | 2018-01-05 |
| CN107537336B true CN107537336B (en) | 2024-04-05 |
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| CN201710945353.2A Active CN107537336B (en) | 2017-10-12 | 2017-10-12 | SCR method denitration flue gas blender |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108325406A (en) * | 2018-03-05 | 2018-07-27 | 中国华电科工集团有限公司 | A kind of novel strong turbulence static mixer |
| CN112742232B (en) * | 2019-10-29 | 2023-04-18 | 中国石油化工股份有限公司 | Ammonia spraying static mixer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202021015U (en) * | 2011-03-18 | 2011-11-02 | 中国船舶重工集团公司第七一一研究所 | Mixed flow-guiding device for a marine diesel SCR (Selective Catalyctic Reduction) system |
| CN202582339U (en) * | 2012-03-01 | 2012-12-05 | 张家港格林沙洲锅炉有限公司 | Diameter-reducing connecting pipe with smoke air guiding device |
| CN103334818A (en) * | 2013-07-09 | 2013-10-02 | 潍柴动力股份有限公司 | SCR catalyzing silencer and mixing tube device thereof |
| CN207576166U (en) * | 2017-10-12 | 2018-07-06 | 中国华电科工集团有限公司 | A kind of SCR methods denitration flue gas mixer |
| CN214036272U (en) * | 2020-12-02 | 2021-08-24 | 威海克莱特菲尔风机股份有限公司 | Axial flow fan with flow guide device |
-
2017
- 2017-10-12 CN CN201710945353.2A patent/CN107537336B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202021015U (en) * | 2011-03-18 | 2011-11-02 | 中国船舶重工集团公司第七一一研究所 | Mixed flow-guiding device for a marine diesel SCR (Selective Catalyctic Reduction) system |
| CN202582339U (en) * | 2012-03-01 | 2012-12-05 | 张家港格林沙洲锅炉有限公司 | Diameter-reducing connecting pipe with smoke air guiding device |
| CN103334818A (en) * | 2013-07-09 | 2013-10-02 | 潍柴动力股份有限公司 | SCR catalyzing silencer and mixing tube device thereof |
| CN207576166U (en) * | 2017-10-12 | 2018-07-06 | 中国华电科工集团有限公司 | A kind of SCR methods denitration flue gas mixer |
| CN214036272U (en) * | 2020-12-02 | 2021-08-24 | 威海克莱特菲尔风机股份有限公司 | Axial flow fan with flow guide device |
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