Ammonia-air mixer for denitration SCR (Selective Catalytic Reduction) ammonia spraying system

Abstract

The utility model discloses an ammonia-air mixer for a denitration SCR (Selective Catalytic Reduction) ammonia spraying system, which relates to the technical field of ammonia-air mixers and comprises a pipe body, a connecting end arranged at the side part of the pipe body, an air inlet pipe arranged on the pipe body, a rotating shaft arranged in the pipe body, a second bearing arranged between the rotating shaft and a mounting plate, and a supporting seat arranged outside the second bearing and connected with the inner wall of the pipe body, a gas mixing plate body, a gas mixing spiral blade and a gas mixing fan blade are sequentially arranged on the rotating shaft, the rotating shaft penetrates through a gas mixing hopper arranged in the pipe body, a filter screen assembly used for filtering dust and impurities is arranged at the position, close to the gas inlet pipe, of the side of the rotating shaft, and a cleaning assembly used for cleaning the filter screen assembly is arranged on the side, away from the connecting end, of the filter screen assembly. In order to solve the problems, the utility model provides the ammonia-air mixer for the denitration SCR ammonia spraying system, so that the mixing uniformity of ammonia gas and air is improved, the denitration efficiency is improved, the filter screen is prevented from being blocked, and the long-term stable operation of the mixer is ensured.

Description

Technical Field

[0001] This utility model relates to the field of ammonia-air mixer technology, specifically an ammonia-air mixer for a denitrification SCR ammonia injection system. Background Technology

[0002] In ammonia injection systems for denitrification SCR, the mixing effect of ammonia and air is crucial to the denitrification efficiency. Traditional ammonia-air mixers suffer from problems such as uneven mixing and easy clogging, leading to reduced denitrification efficiency and affecting the normal operation of the equipment.

[0003] To address the aforementioned issues, our company has designed an ammonia-air mixer for a denitrification SCR ammonia injection system. Utility Model Content

[0004] The purpose of this invention is to address the above problems by providing an ammonia-air mixer for a denitrification SCR ammonia injection system, which improves the uniformity of ammonia and air mixing to enhance denitrification efficiency, prevents filter clogging, and ensures long-term stable operation of the mixer.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An ammonia-air mixer for a denitrification SCR ammonia injection system includes a pipe body with a connecting end on the side and an air inlet pipe on the pipe body. A rotating shaft is installed inside the pipe body, and a second bearing is installed between the rotating shaft and a mounting plate. A support seat is installed outside the second bearing and connected to the inner wall of the pipe body. A mixing plate, a mixing spiral blade, and a mixing fan blade are sequentially installed on the rotating shaft. The rotating shaft passes through a mixing hopper installed inside the pipe body. A filter screen assembly for filtering dust and impurities is installed on the side of the rotating shaft near the air inlet pipe. A cleaning component for cleaning the filter screen assembly is installed on the side of the filter screen assembly away from the connecting end.

[0007] As a further improvement to the above scheme, the mixing plate has a sheet-like structure, and the mixing spiral blade has a spiral sheet-like structure.

[0008] As a further improvement to the above solution, the mixing fan blades are arranged circumferentially around the outside of the sleeve, and a flat key is provided between the sleeve and the rotating shaft. The mixing fan blades have a fan-shaped structure with a larger outer edge and a smaller inner edge.

[0009] As a further improvement to the above solution, the diameter of the end of the gas mixing and equalizing hopper facing the air inlet pipe is larger than that of the end away from the air inlet pipe, and multiple empty slots are arranged around the circumference of the gas mixing and equalizing hopper.

[0010] As a further improvement to the above scheme, at least two lifting lugs are provided on the outer wall of the tube.

[0011] As a further improvement to the above solution, the filter assembly includes two collars, a guide rod on the collar passes through the buffer pad and the support ring, a guide sleeve is provided between the guide rod and the support ring, a dustproof net is provided on the support ring, and a second spring is provided on the side of the support ring and on the guide rod.

[0012] As a further improvement to the above solution, the cleaning assembly includes a brush plate, with a hard brush on the side of the brush plate pressing against the dustproof net. The brush plate is mounted on a movable rod, one end of which is located inside a support cylinder. One end of the support cylinder is connected to a rotating shaft, and a first spring is installed inside the support cylinder.

[0013] As a further improvement to the above solution, the movable rod has a cross-shaped structure.

[0014] Compared with the prior art, the beneficial effects of this utility model are: improving the uniformity of ammonia and air mixing to enhance denitrification efficiency, preventing filter clogging, and ensuring long-term stable operation of the mixer. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0016] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA.

[0017] Figure 3 This is a schematic diagram of the main structure of the brush plate in this utility model.

[0018] Figure 4 This is a partially enlarged schematic diagram of the dustproof netting location in this utility model.

[0019] Figure 5 This is a partially enlarged schematic diagram of the support cylinder position in this utility model.

[0020] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure at point BB.

[0021] The text labels in the diagram represent: 1. Cleaning assembly; 2. Filter assembly; 3. Connecting end; 4. Air inlet pipe; 5. Lifting lug; 6. Mixing plate; 7. Support base; 8. Rotating shaft; 9. Mixing spiral blade; 10. Mixing fan blade; 11. Mixing hopper; 12. Empty trough; 13. Pipe body; 14. First bearing; 15. Flat key; 16. Sleeve; 17. Mounting plate; 18. Second bearing; 101. Hard brush; 102. Brush plate; 103. Movable rod; 104. Support cylinder; 105. First spring; 201. Collar; 202. Buffer pad; 203. Guide rod; 204. Guide sleeve; 205. Support ring; 206. Dustproof net; 207. Second spring. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solution, the present invention will be described in detail below with reference to the embodiments. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0023] like Figures 1-6 As shown, the specific solution of this embodiment is as follows: an ammonia-air mixer for a denitrification SCR ammonia injection system includes a pipe body 13, a connecting end 3 on the side of the pipe body 13, an air inlet pipe 4 on the pipe body 13, a rotating shaft 8 inside the pipe body 13, a second bearing 18 between the rotating shaft 8 and the mounting plate 17, a support seat 7 outside the second bearing 18 connected to the inner wall of the pipe body 13, a mixing plate 6, a mixing spiral blade 9 and a mixing fan blade 10 arranged sequentially on the rotating shaft 8, the rotating shaft 8 passing through a mixing hopper 11 inside the pipe body 13, a filter screen assembly 2 for filtering dust and impurities is arranged on the side of the rotating shaft 8 near the air inlet pipe 4, and a cleaning assembly 1 for cleaning the filter screen assembly 2 is arranged on the side of the filter screen assembly 2 away from the connecting end 3.

[0024] like Figure 1 As shown, in a preferred embodiment of the above, the mixing plate 6 has a sheet-like structure and the mixing spiral blade 9 has a spiral sheet-like structure.

[0025] like Figure 1 As shown, in a preferred embodiment of the above, the air mixing fan blade 10 is arranged circumferentially around the outside of the sleeve 16, and a flat key 15 is provided between the sleeve 16 and the rotating shaft 8. The air mixing fan blade 10 has a fan-shaped structure with a larger outer edge and a smaller inner edge.

[0026] like Figure 1 As shown, in a preferred embodiment, the diameter of the end of the gas mixing hopper 11 facing the air inlet pipe 4 is larger than that of the end away from the air inlet pipe 4. A plurality of empty slots 12 are arranged around the circumference of the gas mixing hopper 11, and a first bearing 14 is provided between the gas mixing hopper 11 and the rotating shaft 8.

[0027] like Figure 1 As shown, in a preferred embodiment, at least two lifting lugs 5 are provided on the outer wall of the tube body 13.

[0028] like Figure 1 As shown, in a preferred embodiment of the above, the filter assembly 2 includes two collars 201. A guide rod 203 disposed on the collar 201 passes through the buffer pad 202 and the support ring 205. A guide sleeve 204 is disposed between the guide rod 203 and the support ring 205. A dustproof net 206 is disposed on the support ring 205. A second spring 207 is disposed on the side of the support ring 205 and on the guide rod 203.

[0029] like Figure 1As shown, in a preferred embodiment of the above, the cleaning assembly 1 includes a brush plate 102, a rigid brush 101 disposed on the side of the brush plate 102 that presses against the dustproof net 206, the brush plate 102 is disposed on a movable rod 103, one end of the movable rod 103 is disposed inside a support cylinder 104, one end of the support cylinder 104 is connected to a rotating shaft 8, and a first spring 105 is disposed inside the support cylinder 104.

[0030] like Figure 1 As shown, in a preferred embodiment of the above, the movable rod 103 has a cross-shaped structure.

[0031] The specific working principle of this utility model is as follows:

[0032] Ammonia and air enter the pipe 13 and first pass through the filter assembly 2. The dustproof net 206 in the filter assembly 2 filters dust and impurities in the gas to prevent impurities from entering the subsequent mixing area. After passing through the filter, the gas enters the mixing plate 6 area. The mixing plate 6 has a plate-like structure, which can perform preliminary mixing of the gas. Then the gas flows to the mixing spiral blade 9. The mixing spiral blade 9 has a spiral plate-like structure, which can make the gas rotate and further enhance the mixing effect. Next, the gas reaches the mixing fan blade 10. The mixing fan blade 10 is arranged circumferentially around the outside of the sleeve 16 and has a fan-shaped structure with a larger outer diameter and a smaller inner diameter. As the rotating shaft 8 rotates, the mixing fan blade 10 strongly stirs the gas, so that the ammonia and air are fully mixed. The mixed gas passes through the mixing hopper 11. The diameter of the end of the mixing hopper 11 facing the air inlet pipe 4 is larger than that of the end facing the air inlet pipe 4. One end of the gas pipe 4 has multiple slots 12 arranged around its upper circumference. This structural design allows the mixed gas to be more evenly distributed to the subsequent reaction area. The hard brush 101 on the side of the brush plate 102 in the cleaning assembly 1 presses against the dustproof net 206. The movable rod 103 has a cross-shaped structure, with one end set inside the support cylinder 104. The support cylinder 104 is equipped with a first spring 105. When the rotating shaft 8 rotates, it drives the support cylinder 104 and the movable rod 103 to move, thereby causing the hard brush 101 to clean the dustproof net 206, preventing the dustproof net 206 from being blocked and ensuring smooth gas passage. When foreign objects that are difficult to clean are stuck or attached to the dustproof net 206, during maintenance operations, by pressing the dustproof net 206, the elastic force of the second spring 207 is used to vibrate the dustproof net 206, which can better remove foreign objects.

[0033] It should be noted that, in this document, the terms "including," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Specific examples have been used in this document to illustrate the principles and implementation methods of the present invention. These examples are merely for the purpose of helping to understand the method and core ideas of the present invention. The above descriptions are only preferred embodiments of the present invention. It should be pointed out that, due to the limitations of written expression and the objective existence of infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the present invention to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. An ammonia-air mixer for a denitrification SCR ammonia injection system, characterized in that, The tube (13) includes a connecting end (3) on the side of the tube (13), an air inlet pipe (4) on the tube (13), a rotating shaft (8) inside the tube (13), a second bearing (18) between the rotating shaft (8) and the mounting plate (17), a support seat (7) outside the second bearing (18) connected to the inner wall of the tube (13), a mixing plate (6), a mixing spiral blade (9) and a mixing fan blade (10) are arranged on the rotating shaft (8) in sequence, the rotating shaft (8) passes through the mixing hopper (11) inside the tube (13), a filter assembly (2) for filtering dust and impurities is arranged on the side of the rotating shaft (8) near the air inlet pipe (4), and a cleaning assembly (1) for cleaning the filter assembly (2) is arranged on the side of the filter assembly (2) away from the connecting end (3).

2. The ammonia-air mixer for a denitrification SCR ammonia injection system according to claim 1, characterized in that, The mixing plate (6) has a sheet-like structure, and the mixing spiral blade (9) has a spiral sheet-like structure.

3. An ammonia-air mixer for a denitrification SCR ammonia injection system according to claim 1, characterized in that, The mixing fan blade (10) is arranged around the outside of the sleeve (16), and a flat key (15) is provided between the sleeve (16) and the rotating shaft (8). The mixing fan blade (10) has a fan-shaped structure with a larger outer edge and a smaller inner edge.

4. An ammonia-air mixer for a denitrification SCR ammonia injection system according to claim 1, characterized in that, The diameter of the end of the gas mixing hopper (11) facing the air inlet pipe (4) is larger than that of the end away from the air inlet pipe (4). Multiple empty slots (12) are arranged around the circumference of the gas mixing hopper (11). A first bearing (14) is arranged between the gas mixing hopper (11) and the rotating shaft (8).

5. An ammonia-air mixer for a denitrification SCR ammonia injection system according to claim 1, characterized in that, At least two lifting lugs (5) are provided on the outer wall of the tube (13).

6. An ammonia-air mixer for a denitrification SCR ammonia injection system according to claim 1, characterized in that, The filter assembly (2) includes two collars (201), a guide rod (203) on the collar (201) passes through the buffer pad (202) and the support ring (205), a guide sleeve (204) is provided between the guide rod (203) and the support ring (205), a dustproof net (206) is provided on the support ring (205), and a second spring (207) is provided on the side of the support ring (205) and on the guide rod (203).

7. An ammonia-air mixer for a denitrification SCR ammonia injection system according to claim 6, characterized in that, The cleaning assembly (1) includes a brush plate (102), a hard brush (101) on the side of the brush plate (102) presses against the dustproof net (206), the brush plate (102) is mounted on a movable rod (103), one end of the movable rod (103) is mounted inside a support cylinder (104), one end of the support cylinder (104) is connected to a rotating shaft (8), and a first spring (105) is mounted inside the support cylinder (104).

8. An ammonia-air mixer for a denitrification SCR ammonia injection system according to claim 7, characterized in that, The movable rod (103) has a cross-shaped structure.

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