CN211988056U - Flue gas cyclone mixing device of SCR (Selective catalytic reduction) denitration system - Google Patents
Flue gas cyclone mixing device of SCR (Selective catalytic reduction) denitration system Download PDFInfo
- Publication number
- CN211988056U CN211988056U CN201922184893.0U CN201922184893U CN211988056U CN 211988056 U CN211988056 U CN 211988056U CN 201922184893 U CN201922184893 U CN 201922184893U CN 211988056 U CN211988056 U CN 211988056U
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- Prior art keywords
- cyclone
- flue gas
- ammonia
- branch pipe
- mixer
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 239000003546 flue gas Substances 0.000 title claims abstract description 29
- 238000010531 catalytic reduction reaction Methods 0.000 title description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 69
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 24
- 238000005507 spraying Methods 0.000 claims abstract description 12
- 238000005192 partition Methods 0.000 claims abstract description 4
- 238000000638 solvent extraction Methods 0.000 claims abstract description 3
- 238000009434 installation Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 13
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000007865 diluting Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model relates to a flue gas cyclone mixing device of an SCR denitration system, which comprises a cyclone mixer homogenizing device arranged behind an ammonia spraying branch pipe along the flow direction of flue gas, wherein the cyclone mixer homogenizing device is formed by tiling and arranging a plurality of cyclone mixers which are arranged opposite to the ammonia spraying branch pipe and are used for covering diluted ammonia gas sprayed by the ammonia spraying branch pipe; the cyclone mixer is composed of an inner cyclone blade set and an outer cyclone blade set, the two sets of cyclone blades rotate in opposite directions, and a circular partition plate for partitioning an airflow channel is arranged between the two sets of cyclone blades. The utility model discloses can strengthen the flue gas and dilute the ammonia and mix the effect, improve denitration reaction efficiency.
Description
Technical Field
The utility model belongs to the technical field of thermal power, especially, relate to a SCR deNOx systems flue gas whirl mixing arrangement.
Background
The thermal power generating unit boiler burns and produces nitrogen oxide NOx and exceeds the standard, installs SCR deNOx systems additional behind the boiler economizer and carries out the desorption to NOx in the flue gas. And an ammonia spraying branch pipe in the SCR denitration reactor sprays diluted ammonia gas and mixes the diluted ammonia gas with flue gas, the mixed gas flows through a catalyst to perform a chemical reaction, and nitrogen oxides NOx are removed.
Traditional SCR deNOx systems air current is evenly arranged as shown in figure 1, and guide plate 11 arranges after ammonia injection branch pipe 12 that the flue gas carries out the misce bene through guide plate 11 with diluting the ammonia, adopts this guide plate uniformizing device, and the flue gas is not abundant with diluting the ammonia mixed effect, causes the denitration effect easily and hangs down, ammonia escape volume is big, air heater blocks up the scheduling problem.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a SCR deNOx systems flue gas whirl mixing arrangement to strengthen the flue gas and dilute the mixed effect of ammonia, improve denitration reaction efficiency.
The utility model provides a flue gas cyclone mixing device of an SCR denitration system, which comprises a cyclone mixer homogenizing device arranged behind an ammonia spraying branch pipe along the flue gas flowing direction, wherein the cyclone mixer homogenizing device is formed by tiling and arranging a plurality of cyclone mixers, and the cyclone mixers are arranged opposite to the ammonia spraying branch pipe and are used for covering diluted ammonia sprayed by the ammonia spraying branch pipe;
the cyclone mixer is composed of an inner cyclone blade set and an outer cyclone blade set, the two sets of cyclone blades rotate in opposite directions, and a circular partition plate for partitioning an airflow channel is arranged between the two sets of cyclone blades.
Furthermore, the swirl mixers are arranged in a rectangular mounting plate, the rectangular mounting plate is of a grid-shaped structure, and one swirl mixer is arranged in each grid.
Borrow by above-mentioned scheme, through SCR deNOx systems flue gas whirl mixing arrangement, can strengthen flue gas and dilute ammonia mixing effect, improve denitration reaction efficiency.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
Fig. 1 is a layout view of a prior baffle uniforming device;
FIG. 2 is a layout view of the homogenizing device of the cyclone mixer of the present invention;
FIG. 3 is a schematic structural diagram of the vortex mixer of the present invention;
FIG. 4 is a comparison of the flow lines and flow velocity distribution in the SCR reactor using a baffle homogenizer and a swirl mixer homogenizer; wherein, 4a is a guide plate homogenizing device, and 4b is a swirl mixer homogenizing device;
FIG. 5 is a comparison graph of the mixing effect of flue gas and diluted ammonia gas in the SCR reactor by adopting a guide plate homogenizing device and a swirl mixer homogenizing device; wherein, 5a is a guide plate homogenizing device, and 5b is a swirl mixer homogenizing device;
FIG. 6 is a comparative graph of the NH3 concentration variation coefficient C.V. for a typical position of an SCR reactor employing a deflector uniformizing apparatus and a swirl mixer uniformizing apparatus within the SCR reactor; wherein, 6a is a guide plate homogenizing device, and 6b is a swirl mixer homogenizing device.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Referring to fig. 2 and 3, the embodiment provides a flue gas swirl mixing device of an SCR denitration system, which includes a swirl mixer homogenizing device 2 arranged behind an ammonia injection branch pipe 1 along a flue gas flowing direction, wherein the swirl mixer homogenizing device 2 is formed by tiling and arranging a plurality of swirl mixers, and the swirl mixers are arranged opposite to the ammonia injection branch pipe 1 and used for covering diluted ammonia gas sprayed from the ammonia injection branch pipe 1;
the swirl mixer consists of an inner swirl blade 21 and an outer swirl blade 22, the rotating directions of the two groups of swirl blades are opposite, and a circular partition plate 23 for dividing an airflow channel is arranged between the two groups of swirl blades.
Through this SCR deNOx systems flue gas whirl mixing arrangement, when the air current passes through the whirl blender, under the effect of whirl blade water conservancy diversion, can produce strong vortex motion, vortex motion makes the air current mixing effect reinforcing, and the distribution of air current will be more even, consequently can strengthen flue gas and dilute ammonia mixing effect, improves denitration reaction efficiency.
In this embodiment, the swirl mixers are mounted in a rectangular mounting plate, which is a grid-like structure, with one swirl mixer mounted in each grid.
Referring to fig. 4 and 5, the streamline and flow velocity distribution in the SCR reactor are shown in fig. 4, and the mixing effect of the flue gas and the diluted ammonia gas in the SCR reactor is shown in fig. 5. It can be seen that, compared with the guide plate, the swirl mixer homogenizing device arranged in the SCR denitration system can obviously enhance the mixing effect of flue gas and diluted ammonia gas. The swirl mixer has a unique flow guide structure with opposite rotating directions of the inner circle of blades and the outer circle of blades, and flue gas and diluted ammonia gas can generate strong vortex motion and mixing action after passing through the swirl mixer, so that the air flow is mixed more uniformly.
Fig. 6 shows the NH3 concentration variation coefficient c.v. for a typical position of the SCR reactor. The larger the variation coefficient of the NH3 concentration is, the more uniform the mixing effect of the flue gas and the diluted ammonia gas is. It can be seen that when the SCR reactor is additionally provided with the guide plate homogenizing device, the concentration variation coefficients of NH3 on three planes after the ammonia spraying branch pipe are respectively 30.2%, 29.8% and 29.3%; when the SCR reactor is additionally provided with the swirl mixer homogenizing device, the concentration variation coefficients of NH3 on three planes behind the ammonia spraying branch pipe are respectively 27.5%, 24.0% and 20.6%. The cyclone mixer has obvious mixing effect on the flue gas and the diluted ammonia gas.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (2)
1. A flue gas cyclone mixing device of an SCR denitration system is characterized by comprising a cyclone mixer homogenizing device which is arranged behind an ammonia spraying branch pipe along the flow direction of flue gas, wherein the cyclone mixer homogenizing device is formed by tiling and arranging a plurality of cyclone mixers, and the cyclone mixers are arranged opposite to the ammonia spraying branch pipe and used for covering diluted ammonia gas sprayed by the ammonia spraying branch pipe;
the cyclone mixer is composed of an inner cyclone blade set and an outer cyclone blade set, the two sets of cyclone blades rotate in opposite directions, and a circular partition plate for partitioning an airflow channel is arranged between the two sets of cyclone blades.
2. The flue gas swirl mixing device of the SCR denitration system of claim 1, wherein the swirl mixers are installed in a rectangular installation plate, the rectangular installation plate is of a grid-like structure, and one swirl mixer is installed in each grid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922184893.0U CN211988056U (en) | 2019-12-09 | 2019-12-09 | Flue gas cyclone mixing device of SCR (Selective catalytic reduction) denitration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922184893.0U CN211988056U (en) | 2019-12-09 | 2019-12-09 | Flue gas cyclone mixing device of SCR (Selective catalytic reduction) denitration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211988056U true CN211988056U (en) | 2020-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922184893.0U Expired - Fee Related CN211988056U (en) | 2019-12-09 | 2019-12-09 | Flue gas cyclone mixing device of SCR (Selective catalytic reduction) denitration system |
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| CN (1) | CN211988056U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110975656A (en) * | 2019-12-09 | 2020-04-10 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Flue gas cyclone mixing device of SCR (Selective catalytic reduction) denitration system |
-
2019
- 2019-12-09 CN CN201922184893.0U patent/CN211988056U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110975656A (en) * | 2019-12-09 | 2020-04-10 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Flue gas cyclone mixing device of SCR (Selective catalytic reduction) denitration system |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201124 |