CN219848976U - Nozzle assembly suitable for denitration and self-turbulent flow type ammonia spraying grid device - Google Patents
Nozzle assembly suitable for denitration and self-turbulent flow type ammonia spraying grid device Download PDFInfo
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- CN219848976U CN219848976U CN202321133323.9U CN202321133323U CN219848976U CN 219848976 U CN219848976 U CN 219848976U CN 202321133323 U CN202321133323 U CN 202321133323U CN 219848976 U CN219848976 U CN 219848976U
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- Prior art keywords
- spoiler
- nozzle
- ammonia
- denitration
- nozzle assembly
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 137
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 60
- 238000005507 spraying Methods 0.000 title claims abstract description 40
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000003546 flue gas Substances 0.000 claims abstract description 36
- 230000000694 effects Effects 0.000 claims abstract description 14
- 230000000712 assembly Effects 0.000 claims description 14
- 238000000429 assembly Methods 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 2
- 239000000779 smoke Substances 0.000 abstract description 13
- 230000003068 static effect Effects 0.000 description 10
- 238000009434 installation Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The utility model provides a nozzle assembly and a self-turbulent flow type ammonia spraying grid device suitable for denitration, wherein the nozzle assembly is arranged in a flue, the nozzle assembly comprises a spoiler and a nozzle, the spoiler at least partially blocks the flow direction of smoke in the flue, the nozzle is positioned at the rear side of the spoiler along the flow direction of the smoke, the nozzle is used for spraying ammonia, and the spoiler is used for enabling the smoke at the rear side of the spoiler to generate vortex flow so as to strengthen the effect of mixing with the ammonia; the flow direction of the flue gas is perpendicular to the spoiler, and the ammonia spraying direction of the nozzle is parallel to the flow direction of the flue gas. By adopting the technical scheme, the device is simple and efficient, occupies small space, has low resistance and can realize efficient mixing of ammonia and flue gas.
Description
Technical Field
The utility model relates to a nozzle assembly suitable for denitration and a self-turbulent flow type ammonia spraying grid device.
Background
The Selective Catalytic Reduction (SCR) process is one of the most mature denitration technologies, and is widely applied to the tail gas treatment in the industries of electric power, steel, chemical industry, coking, glass, cement and the like. With the promotion of ultra-low emission, NOx emission in many industrial fields is less than or equal to 50mg/Nm 3 Reduced to less than or equal to 35mg/Nm 3 Even less than or equal to 15mg/Nm 3 This puts higher demands on the SCR denitration technology, in particular, the mixing uniformity of ammonia gas and flue gas, which relates to the SCR denitration efficiency and ammonia slip guarantee. In order to improve the mixing uniformity of ammonia gas and flue gas, a static mixer is usually arranged behind an ammonia spraying grid in the traditional SCR denitration process to strengthen mixing, but the static mixer has the problems of complex structure, high resistance and high energy consumption at present to achieve a better mixing effect. In addition, the SCR denitration technology is also designed by integrating the ammonia spraying grid and the static mixer, and the turbulent flow element of the static mixer is arranged at the outlet of the nozzle, but the flow velocity of ammonia at the outlet is very high, so that the turbulent flow element is subjected to larger impact, the damage of the turbulent flow element is easy to cause, the structure of the turbulent flow element is complex, the production cost is high, and the installation accuracy is difficult to controlThe problem of greatly reducing the mixing effect due to the easy occurrence of mounting deviation.
The mixing effect of current ammonia injection grid and static mixer is general, and device structure is complicated, and the resistance is big, and the energy consumption is high, and is high to the installation requirement, in case the installation deviation appears, its mixing effect greatly reduced, is difficult to adapt to the operating mode demand of current high SCR denitration efficiency, low ammonia escape. Therefore, how to improve the structural design of the ammonia injection grid and the static mixer and improve the mixing effect of ammonia and flue gas is the key of improving the SCR denitration technology.
At present, the domestic and foreign ammonia spraying grids mainly can be divided into three types, the first type of grid type ammonia spraying grids divide a flue into a plurality of areas, each area is provided with a plurality of nozzles, the ammonia spraying amount of each area can be independently regulated, and the ammonia nitrogen ratio in the flue gas is controlled by regulating the ammonia spraying amount of each area. The ammonia spraying grille is not provided with a static mixer, has low resistance, can realize relatively uniform ammonia spraying in each area, is difficult to realize uniform mixing, can be realized by long-distance flue, and has a common mixing effect. The second type is that on the basis of the first type, a static mixing device is additionally arranged at the downstream section, and rapid mixing is realized through reinforcement, but the whole occupied space is large and the resistance is high. The third category is to arrange the ammonia spraying grille and the static mixer integrally, and generally, a turbulence element is arranged at the outlet of the nozzle, so that the ammonia gas forms diffusion movement after being sprayed out of the nozzle, and the mixing effect with the flue gas is enhanced. However, the turbulent flow element of the static mixer is arranged at the outlet of the nozzle, the flow velocity of the ammonia gas at the position is very high, larger impact can be caused on the turbulent flow element, the damage of the turbulent flow element is easy to cause, the structure of the turbulent flow element is complex, the production cost is high, the installation accuracy is difficult to control, and the problem that the installation deviation is easy to occur so as to greatly reduce the mixing effect is solved. Therefore, the prior art has the technical defects that the method is simple and efficient, small in space occupation and low in resistance, and can realize efficient mixing of ammonia gas and smoke.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide a nozzle assembly and a self-turbulent flow type ammonia spraying grid device which are suitable for denitration.
In order to solve the technical problems described above, the present utility model provides a nozzle assembly suitable for denitration, the nozzle assembly being disposed in a flue, the nozzle assembly including a spoiler and a nozzle, the spoiler at least partially blocking a flow direction of flue gas in the flue, the nozzle being located at a rear side of the spoiler along the flow direction of flue gas, the nozzle being configured to eject ammonia gas, the spoiler being configured to generate a swirling flow on a rear side thereof to mix with the ammonia gas; the flow direction of the flue gas is perpendicular to the spoiler, and the ammonia spraying direction of the nozzle is parallel to the flow direction of the flue gas.
In a more preferred embodiment, the ammonia spraying direction of the nozzle passes through the center of the spoiler.
In a more preferred embodiment, the spoiler is circular, square or triangular.
In a more preferred embodiment, the spoiler is circular, and the diameter of the spoiler is 100 mm to 800 mm.
In a more preferred embodiment, the spoiler is square, and the side length of the spoiler is 100 mm to 800 mm.
In a more preferred embodiment, the spoiler is in the shape of a regular triangle, and the spoiler becomes 100 mm to 800 mm.
In a more preferred embodiment, the ammonia outlet of the nozzle is spaced from the spoiler by 0 to 100 mm.
The utility model also provides a self-turbulent flow type ammonia spraying grid device which is suitable for being arranged in a flue and comprises a plurality of nozzle assemblies suitable for denitration; the plurality of nozzle assemblies are positioned on the same horizontal plane and are uniformly spaced.
In a more preferred embodiment, the spacing between the nozzle assemblies is 300 mm to 1000 mm.
In a more preferred embodiment, the device further comprises an ammonia injection header, a header branch pipe, a flowmeter, a flow regulating valve and a nozzle branch pipe; the header branch pipe is connected with an ammonia spraying header, the nozzle branch pipe is connected with the header branch pipe, and the flowmeter and the flow regulating valve are arranged on the header branch pipe; the nozzle manifold connects the plurality of nozzle assemblies.
Compared with the prior art, the technical scheme of the utility model has the following beneficial effects:
the flow direction of the flue gas is perpendicular to the spoiler, and the ammonia spraying direction of the nozzle is parallel to the flow direction of the flue gas, so that the amount of the flue gas flowing from the edge of the spoiler is approximately equal, and the ammonia spraying direction is parallel to the flow direction of the flue gas, so that sprayed ammonia can be better mixed with the vortex formed by the flue gas.
The ammonia spraying direction of the nozzle passes through the center of the spoiler, and the flue gas flowing from the edge of the spoiler flows to the same flow length which is mixed with the ammonia gas, so that the mixing effect can be increased.
Drawings
FIG. 1 is a side view of a self-turbulent flow ammonia injection grille assembly positioned in a flue according to a preferred embodiment of the utility model.
FIG. 2 is a cross-sectional view of A-A of the self-turbulent flow type ammonia injection grille device in the flue, and the turbulent flow plate is circular.
FIG. 3 is a cross-sectional view of A-A of the self-turbulent flow type ammonia injection grille device of the utility model in a flue, and the turbulent flow plate is square.
FIG. 4 is a cross-sectional view of A-A of the self-turbulent flow type ammonia injection grille device of the utility model in a flue, and the turbulent flow plate is triangular.
Detailed Description
The utility model is further described below with reference to the drawings and detailed description.
Referring to fig. 1-4, a nozzle assembly suitable for denitration, the nozzle assembly is arranged in a flue 8, the nozzle assembly comprises a spoiler 6 and a nozzle 7, the spoiler 6 at least partially blocks the flow direction of the flue gas in the flue 8, the nozzle 7 is positioned at the rear side of the spoiler 6 along the flow direction of the flue gas, the nozzle 7 is used for spraying ammonia gas, and the spoiler 6 is used for enabling the flue gas to generate vortex flow at the rear side so as to strengthen the effect of mixing with the ammonia gas; the spoiler 6 is in a flat plate shape, the flow direction of the flue gas is perpendicular to the spoiler 6, and the ammonia spraying direction of the nozzle 7 is parallel to the flow direction of the flue gas.
The spoiler 6 is in a flat plate shape, the spoiler 6 comprises a front baffle plane and a rear side surface, the front baffle plane corresponds to the front side in the smoke flow direction, the rear side surface corresponds to the rear side in the smoke flow direction, when smoke is blocked by the spoiler 6, the smoke flowing through the edge of the front baffle plane can be focused behind the rear side surface to form vortex due to the fact that the air pressure on the rear side surface is lower than that on the front baffle plane, and the smoke flow direction is perpendicular to the spoiler 6 and the ammonia spraying direction of the nozzle 7 is parallel to the smoke flow direction, so that the quantity of the smoke flowing through the edge of the spoiler 6 is approximately equal, and the ammonia spraying direction is parallel to the smoke flow direction, so that sprayed ammonia can be better mixed with the vortex formed by the smoke.
In this embodiment, the ammonia spraying direction of the nozzle 7 passes through the center of the spoiler 6, and the flue gas flowing from the edge of the spoiler 6 flows to the substantially same flow length as the ammonia gas, which can increase the mixing effect.
The outer contour of the spoiler 6 is round, square or triangular; when the outer contour of the spoiler 6 is circular, the ammonia spraying direction of the nozzle 7 passes through the center of the spoiler 6, and the outer contour of the spoiler 6 is circular, so that the amount of the flue gas flowing through the edge of the spoiler 6 is equal, the flow length of the flue gas flowing through the edge of the spoiler 6 is equal to the flow length of the flue gas mixed with the ammonia gas, and the mixing uniformity of the flue gas and the ammonia gas is enhanced; when the outer contour of the spoiler 6 is square, gaps for the flue gas to pass through are approximately the same between the nozzle assemblies when the nozzle assemblies are arranged in an array mode, so that the flue gas in the flue 8 is distributed uniformly, and the flue gas and the ammonia gas can be mixed more uniformly by combining the vortex effect of the square spoiler 6; when the outer contour of the spoiler 6 is triangular, the side lengths of the three sides of the triangle may be equal or unequal, and when the three side lengths of the triangle are equal, the flue gas flowing from the edge of the spoiler 6 flows to the same flow length mixed with the ammonia gas.
When the spoiler 6 is circular, the diameter of the spoiler 6 is 100 mm to 800 mm. When the spoiler 6 is square, the side length of the spoiler 6 is 100 mm to 800 mm. When the spoiler 6 is in a regular triangle shape, the side length of the spoiler 6 is 100-800 mm. More specifically, the ammonia injection outlet of the nozzle 7 is spaced from the spoiler 6 by 0 to 100 mm.
The utility model also provides a self-turbulent flow type ammonia spraying grid device which is suitable for being installed in the flue 8 and comprises a plurality of nozzle assemblies suitable for denitration; the plurality of nozzle assemblies are positioned on the same horizontal plane and are uniformly spaced. In an embodiment, the spacing between the nozzle assemblies is 300 millimeters to 1000 millimeters.
The self-turbulent flow type ammonia spraying grid device further comprises an ammonia spraying header 1, a header branch pipe 2, a flowmeter 3, a flow regulating valve 4 and a nozzle branch pipe 5; the header branch pipe 2 is connected with an ammonia spraying header 1, the nozzle branch pipe 5 is connected with the header branch pipe 2, and the flowmeter 3 and the flow regulating valve 4 are arranged on the header branch pipe 2; the nozzle manifold 5 connects the plurality of nozzle assemblies. Ammonia in the ammonia spraying header 1 can be conveyed to a plurality of header branch pipes 2 through components such as an air pump, the ammonia amount conveyed to the nozzle branch pipes 5 is controlled through the flowmeter 3 and the flow regulating valve 4, the header branch pipes 2 can be connected with a plurality of the nozzle branch pipes 5, and the nozzle branch pipes 5 can be connected with a plurality of nozzle assemblies to realize array arrangement.
The foregoing is only a preferred embodiment of the present utility model, but the design concept of the present utility model is not limited thereto, and any person skilled in the art will be able to make insubstantial modifications of the present utility model within the scope of the present utility model disclosed herein by this concept, which falls within the actions of invading the protection scope of the present utility model.
Claims (10)
1. A nozzle assembly suitable for denitration, the nozzle assembly being arranged in a flue, the nozzle assembly comprising a spoiler and a nozzle, the spoiler at least partially blocking a flow direction of flue gas in the flue, the nozzle being positioned at a rear side of the spoiler in the flow direction of flue gas, the nozzle being configured to eject ammonia gas, the spoiler being configured to generate a swirling flow on a rear side of the spoiler to enhance an effect of mixing with the ammonia gas; the flow direction of the flue gas is perpendicular to the spoiler, and the ammonia spraying direction of the nozzle is parallel to the flow direction of the flue gas.
2. A nozzle assembly suitable for denitration as claimed in claim 1, wherein: the ammonia spraying direction of the nozzle passes through the center of the spoiler.
3. A nozzle assembly suitable for denitration as claimed in claim 2, wherein: the spoiler is round, square or triangular.
4. A nozzle assembly suitable for denitration as claimed in claim 2, wherein: the spoiler is circular, and the diameter of the spoiler is 100-800 mm.
5. A nozzle assembly suitable for denitration as claimed in claim 2, wherein: the spoiler is square, and the side length of the spoiler is 100-800 mm.
6. A nozzle assembly suitable for denitration as claimed in claim 2, wherein: the spoiler is in a regular triangle shape, and the change of the spoiler is 100-800 mm.
7. A nozzle assembly suitable for denitration as claimed in claim 2, wherein: the distance between the ammonia spraying outlet of the nozzle and the spoiler is 0-100 mm.
8. From vortex formula ammonia spraying grid device is applicable to and installs in the flue, its characterized in that: a nozzle assembly comprising a plurality of nozzles as defined in any one of claims 1 to 7 adapted for denitration; the plurality of nozzle assemblies are positioned on the same horizontal plane and are uniformly spaced.
9. A self-turbulent flow type ammonia injection grille device as claimed in claim 8, wherein: the nozzle assemblies are spaced apart by 300 mm to 1000 mm.
10. A self-turbulent flow type ammonia injection grille device as claimed in claim 8, wherein: the device also comprises an ammonia spraying header, header branch pipes, a flowmeter, a flow regulating valve and nozzle branch pipes; the header branch pipe is connected with an ammonia spraying header, the nozzle branch pipe is connected with the header branch pipe, and the flowmeter and the flow regulating valve are arranged on the header branch pipe; the nozzle manifold connects the plurality of nozzle assemblies.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321133323.9U CN219848976U (en) | 2023-05-12 | 2023-05-12 | Nozzle assembly suitable for denitration and self-turbulent flow type ammonia spraying grid device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321133323.9U CN219848976U (en) | 2023-05-12 | 2023-05-12 | Nozzle assembly suitable for denitration and self-turbulent flow type ammonia spraying grid device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219848976U true CN219848976U (en) | 2023-10-20 |
Family
ID=88318450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321133323.9U Active CN219848976U (en) | 2023-05-12 | 2023-05-12 | Nozzle assembly suitable for denitration and self-turbulent flow type ammonia spraying grid device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219848976U (en) |
-
2023
- 2023-05-12 CN CN202321133323.9U patent/CN219848976U/en active Active
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