CN214862524U - Triangular multi-channel SCR static mixer - Google Patents
Triangular multi-channel SCR static mixer Download PDFInfo
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- CN214862524U CN214862524U CN202022580054.3U CN202022580054U CN214862524U CN 214862524 U CN214862524 U CN 214862524U CN 202022580054 U CN202022580054 U CN 202022580054U CN 214862524 U CN214862524 U CN 214862524U
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Abstract
The utility model relates to a triangle-shaped multichannel SCR static mixer, including blender main part, guide plate, the blender main part includes triangle-shaped division board, scute, entry connecting piece, the division board sets up from top to bottom and forms the flue gas passageway, triangle-shaped division board three sides form first, second flue gas entry, exhanst gas outlet, lie in first/second flue gas entry one side, the scute closes the first/second flue gas entry of odd number layer/even number layer of this side; the guide plate sets up in the upper reaches of flue gas entry, and the entry connecting piece sets up in the flue gas passageway of first, second flue gas entry junction, and the entry connecting piece is the triangle-shaped toper, and the entry connecting piece is connected both sides scute. The utility model discloses can make the relative standard deviation decline range of NOx concentration distribution that ammonia injection grid enters the mouth reach more than 60%, reduce unit load, grind the combination and the influence of burning adjustment to SCR entry NOx concentration distribution by a wide margin, fundamentally improves SCR denitrification facility's variable operating mode adaptability.
Description
Technical Field
The utility model relates to a SCR denitration technology field especially relates to a triangle-shaped multichannel SCR static mixer.
Background
Under the current situation of ultralow NOx emission, the NOx emission of a coal-fired power plant is reduced to 50mg/m3Hereinafter, the SCR denitration efficiency needs to be improved to about 90%. In order to control the ammonia escape concentration to ensure the safe operation of the unit, not only a sufficient volume of catalyst needs to be added, but also NH at the top catalyst inlet of the SCR reactor3The uniformity of the distribution of the molar ratio/NO also places higher demands. The concentration and distribution of NOx at the SCR inlet is directly related to the combustion conditions in the furnace. The concentration distribution of NOx at the inlet of the SCR can be obviously changed due to the load of a unit, the change of the combination of the mill and the change of the combustion working condition in the furnace caused by the combustion adjustment, and NH at the inlet of the catalyst3The distribution uniformity of the/NO molar ratio becomes poor, and the escape of ammonia at the denitration outlet rises.
In order to meet the requirement of ultralow emission of NOx, a novel SCR static mixer needs to be researched and developed urgently, the influence of unit load, grinding combination and combustion adjustment on the concentration distribution of NOx at an SCR inlet is reduced, the variable working condition adaptability of an SCR denitration device is improved fundamentally, and ammonia escape is reduced.
For increasing NH inlet of SCR catalyst3the/NOx molar ratio distribution uniformity, AIG nozzles and static mixers are typically arranged in an array of SCR inlet cross sections to enhance mixing of the nozzle outlet reductant ammonia with local flue gas. The mixing range of the SCR static mixers is small (less than or equal to 3 m), and the changes of NOx concentration fields and flow fields in upstream flue gas can be only adapted by adjusting the flow of AIG branch pipes. When the concentration distribution of the upstream NOx of the AIG under the combination of different loads and coal mills of the unit is greatly changed, the working condition of the conventional ammonia injection mixing device cannot be self-adaptive, and the mixing uniformity of the NH3/NOx at the catalyst inlet is poor.
Patent publication No. CN106731827A discloses an AIG upstream smoke large-scale self-mixing device, which is provided with a diamond-shaped partition part in the middle of the inlet, straight plates or folded plates on two sides for guiding the flow, and a flow-around element is not arranged at the outlet. Due to the limitation of the inlet and outlet structures of the device, the relative standard deviation of the NOx concentration distribution at the inlet of the ammonia injection grid can be reduced by 20-40%, and the performance still needs to be further improved.
Disclosure of Invention
The utility model aims at providing a triangle-shaped multichannel SCR static mixer.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a triangular multi-channel SCR static mixer comprising a mixer body, a plurality of baffles, wherein:
the mixer main body comprises a plurality of triangular partition plates and a plurality of angle plates, wherein the partition plates are arranged up and down, a flue gas channel is formed between every two adjacent partition plates, a first flue gas inlet is formed on the first side of each triangular partition plate, a second flue gas inlet is formed on the second side of each triangular partition plate, a flue gas outlet is formed on the third side of each triangular partition plate, the angle plates are positioned on one side of the first flue gas inlet, the angle plates close the first flue gas inlets on odd layers of the side and the second flue gas inlets on even layers of the side, and the angle plates close the second flue gas inlets on even layers of the side; the mixer main body further comprises an inlet connecting piece arranged in a flue gas channel at the intersection of the first flue gas inlet and the second flue gas inlet, the inlet connecting piece is in a triangular cone shape, and the corner plates on the two sides are connected through the inlet connecting piece.
Preferably, the mixer main body further comprises a spoiler, and the spoiler is arranged on the side edge of the partition plate on one side of the smoke outlet.
More preferably, a plurality of spoilers are arranged along the side edge of the partition plate, and in two adjacent spoilers, one spoiler extends towards one side of the surface where the partition plate is located, and the other spoiler extends towards the other side of the surface where the partition plate is located.
Further preferably, the positions and the extending directions of the spoilers on two adjacent partition plates are the same, and two adjacent spoilers on two adjacent partition plates are connected.
Further preferably, the spoiler is trapezoidal, and the long side of the trapezoidal spoiler is connected to the side edge of the partition plate.
Preferably, the guide plates are arc-shaped, and the bending directions of the guide plates on the two sides of the inlet connecting piece are opposite, so that the smoke on the two sides can be crossed and mixed, and the resistance is reduced.
Preferably, baffles disposed adjacent to both sides of the inlet connector are connected to the inlet connector.
Preferably, the number of the guide plates is even and is more than or equal to 6.
Preferably, the number of the partition plates is odd and the partition plates are arranged in parallel, and the distance between two adjacent partition plates is 0.4-1.5 m.
Preferably, the cross section of the angle plate is in a V shape with an included angle less than or equal to 90 degrees.
Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:
the utility model discloses can make the relative standard deviation of NOx concentration distribution that ammonia sprays grid entry descend, reduce unit load, grind combination and combustion adjustment to SCR entry NOx concentration distribution's influence by a wide margin, fundamentally improves SCR denitrification facility's variable working condition adaptability.
Drawings
FIG. 1 is a front view of the present embodiment;
FIG. 2 is a side view of the present embodiment;
fig. 3 is a top view of the present embodiment.
In the above drawings:
10. a partition plate; 100. a first flue gas inlet; 101. a second flue gas inlet; 102. a flue gas outlet; 11. a gusset; 12. a flue gas channel; 13. an inlet connection; 14. a spoiler; 2. a baffle.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A triangular multi-channel SCR static mixer as shown in fig. 1-3 comprises a mixer body, a plurality of baffles 2. Specifically, the method comprises the following steps:
the mixer body includes a plurality of triangular partition plates 10, a plurality of gussets 11. The partition plates 10 are arranged in parallel up and down, a flue gas channel 12 is formed between every two adjacent partition plates 10, the partition plates 10 are arranged in odd layers, the whole flue is divided into even-numbered flue gas channels 12 by the partition plates 10 in the odd layers in the depth direction, and the distance between every two adjacent partition plates 10 is 0.4-1.5 m. The cross section of the angle plate 11 is in a V shape with an included angle less than or equal to 90 degrees.
The first side of the triangular partition plate 10 forms a first flue gas inlet 100, the second side forms a second flue gas inlet 101, the third side forms a flue gas outlet 102, the triangular partition plate is positioned on one side of the first flue gas inlet 100, the angle plate 11 seals the first flue gas inlet 100 on the odd-numbered layer of the side, the angle plate 11 is positioned on one side of the second flue gas inlet 101, the angle plate 11 seals the second flue gas inlet 101 on the even-numbered layer of the side, namely, the left side or the right side of each layer of flue gas channel 12 is sealed on one side through the angle plate 11, and the angle plates 11 of the flue gas inlets on the two adjacent layers of flue gas channels 12 are not positioned on the same side.
The mixer main body also comprises an inlet connecting piece 13 arranged in the flue gas channel 12 at the intersection of the first flue gas inlet 100 and the second flue gas inlet 101, wherein the inlet connecting piece 13 is in a triangular cone shape, and the inlet connecting piece 13 is used for connecting the corner plates 11 at two sides. The inlet connection piece 13 may be formed by connecting three triangular plates, preferably three triangular plates with a circular arc transition at the joint.
The mixer body further includes a spoiler 14, and the spoiler 14 is provided on the partition plate 10 on the side of the flue gas outlet 102. In this embodiment: the spoiler 14 has a trapezoidal shape, and the long side of the trapezoidal spoiler 14 is connected to the side of the partition plate 10. The spoiler 14 is provided with a plurality of spoilers 14 along the side edge of the partition plate 10, in two adjacent spoiler 14, one spoiler 14 extends towards one side of the surface where the partition plate 10 is located, and the other spoiler 14 extends towards the other side of the surface where the partition plate 10 is located, namely the extending directions respectively extend towards two sides of the surface where the partition plate 10 is located, and the two spoiler 14 is in a V shape when viewed from the side surface; the positions and the extending directions of the spoilers 14 on two adjacent partition plates 10 are the same, and the two adjacent spoilers 14 on two adjacent partition plates 10 are in point connection, so that the vibration generated when the smoke passes through the mixer is reduced, and the smoke is in a W shape when viewed from the side.
The guide plates 2 are arranged at the upstream of the first smoke inlet 100 and the second smoke inlet 101 and distributed along the two sides of the first smoke inlet 100 and the second smoke inlet 101, and the number of the guide plates 2 is even and is more than or equal to 6. In this embodiment: the guide plate 2 is arc-shaped, and the bending directions of the guide plates 2 on the two sides of the inlet connecting piece 13 are opposite to each other, so that the smoke on the two sides can be crossed and mixed, and the resistance can be reduced. The guide plates 2 disposed near both sides of the inlet connection member 13 are connected to the inlet connection member 13, for example, the left and right guide plates 2 near the inlet connection member 13 are connected to the inlet connection member 13.
When the flue gas passes through the mixer: the flue gas entering the flue gas channel 12 from the first flue gas inlet 100 flows and diffuses to the whole width section through the even-numbered layers of flue gas channels 12 in the depth direction, the flue gas entering the flue gas channel 12 from the second flue gas inlet 101 flows and diffuses to the whole width section through the odd-numbered layers of flue gas channels 12 in the depth direction, the flue gas of the two layers of flue gas outlets 102 connected with each other at the flue gas outlet 102 is mixed with each other under the action of the flow-around sheet 14, and the large-range mixing on the whole width section is realized through the layered cross flow of the flue gas at the left side and the right side and the mixing between the outlet layers.
Example (b):
adopt the triangle-shaped multichannel SCR static mixer of this embodiment, carried out entry flow field optimal design and transformation to the SCR denitrification facility of certain 660MW coal-fired generating set. The width of the triangular multi-channel SCR static mixer is 16.2m, the length is 8.5m, the height is 3.2m, 14 guide plates 2 are arranged at the inlet, 3 layers of triangular partition plates 10 are arranged in the height direction, 4 angle plates 11 with included angles of 60 degrees are arranged on two sides of the triangular multi-channel SCR static mixer, the distance between the partition plates 10 is 0.8m, and 42 trapezoidal flow surrounding sheets 14 are arranged on each layer of partition plate 10.
This example illustrates that the triangular multi-channel SCR static mixer proposed in this example reduces the relative standard deviation of the NOx concentration distribution at the inlet of the ammonia injection grid, and greatly reduces the influence of the unit load, the mill combination and the combustion adjustment on the NOx concentration distribution at the inlet of the SCR.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (10)
1. A triangular multi-channel SCR static mixer comprising a mixer body, a plurality of baffles, wherein:
the mixer main body comprises a plurality of triangular partition plates and a plurality of angle plates, wherein the partition plates are arranged up and down, a flue gas channel is formed between every two adjacent partition plates, a first flue gas inlet is formed on the first side of each triangular partition plate, a second flue gas inlet is formed on the second side of each triangular partition plate, a flue gas outlet is formed on the third side of each triangular partition plate, the angle plates are positioned on one side of the first flue gas inlet, the angle plates close the first flue gas inlets on odd layers of the side and the second flue gas inlets on even layers of the side, and the angle plates close the second flue gas inlets on even layers of the side; the polylith the guide plate set up first flue gas entry, the upper reaches of second flue gas entry, its characterized in that: the mixer main body further comprises an inlet connecting piece arranged in the flue gas channel at the intersection of the first flue gas inlet and the second flue gas inlet, the inlet connecting piece is in a triangular cone shape, and the corner plates on the two sides are connected through the inlet connecting piece.
2. The triangular multi-channel SCR static mixer of claim 1, wherein: the mixer main body further comprises a spoiler, and the spoiler is arranged on the partition plate and located on the side edge of one side of the smoke outlet.
3. The triangular multi-channel SCR static mixer of claim 2, wherein: the spoiler is provided with a plurality of spoilers along the side edge of the partition plate, one spoiler extends towards one side of the surface where the partition plate is located in two adjacent spoilers, and the other spoiler extends towards the other side of the surface where the partition plate is located.
4. The triangular multi-channel SCR static mixer of claim 3, wherein: the positions and the extending directions of the spoilers on two adjacent partition plates are the same, and the two spoilers on the two adjacent partition plates are connected.
5. The triangular multi-channel SCR static mixer of claim 2, wherein: the spoiler is trapezoidal, and the long edge of the spoiler is connected to the side edge of the partition plate.
6. The triangular multi-channel SCR static mixer of claim 1, wherein: the guide plate is arc-shaped, and the bending directions of the guide plates on the two sides of the inlet connecting piece are opposite.
7. The triangular multi-channel SCR static mixer of claim 1, wherein: the guide plates arranged at two sides close to the inlet connecting piece are connected with the inlet connecting piece.
8. The triangular multi-channel SCR static mixer of claim 1, wherein: the number of the guide plates is even and is more than or equal to 6.
9. The triangular multi-channel SCR static mixer of claim 1, wherein: the number of the partition plates is odd and the partition plates are arranged in parallel, and the distance between every two adjacent partition plates is 0.4-1.5 m.
10. The triangular multi-channel SCR static mixer of claim 1, wherein: the cross section of the angle plate is in a V shape with an included angle less than or equal to 90 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022580054.3U CN214862524U (en) | 2020-11-10 | 2020-11-10 | Triangular multi-channel SCR static mixer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022580054.3U CN214862524U (en) | 2020-11-10 | 2020-11-10 | Triangular multi-channel SCR static mixer |
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| CN214862524U true CN214862524U (en) | 2021-11-26 |
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| CN202022580054.3U Active CN214862524U (en) | 2020-11-10 | 2020-11-10 | Triangular multi-channel SCR static mixer |
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