Abrasion-resistant ammonia spraying grid easy to disassemble and assemble

Abstract

The utility model discloses a wear-resistant ammonia injection grid easy to disassemble and assemble, which is arranged in a flue and comprises a first-stage ammonia delivery pipe, a second-stage ammonia delivery pipe and a third-stage ammonia delivery pipe, the gas inlet end of the first-stage ammonia delivery pipe penetrates through an outer wall opening formed in the flue and is arranged outside the flue, and the second-stage ammonia delivery pipe is communicated with the gas outlet end of the first-stage ammonia delivery pipe and is arranged along the radial direction of the flue. And the third-stage ammonia conveying pipe is communicated with the second-stage ammonia conveying pipe and is arranged along the axial direction of the flue. Ammonia gas is fed into the pipeline through the gas inlet end of the first-stage ammonia feeding pipe, then the ammonia gas is distributed in the radial direction of the flue through the second-stage ammonia feeding pipe, then the ammonia gas is distributed in the axial direction of the flue through the third-stage ammonia feeding pipe, finally the ammonia gas is fed to all positions of the flue through the third-stage ammonia feeding pipe, and the ammonia gas is fed into the flue through the multi-stage ammonia feeding pipe. The second-stage pipeline and the third-stage pipeline are vertically arranged, so that ammonia gas can be uniformly fed into the flue, and the multi-stage pipeline has the characteristic of convenience in disassembly, assembly and maintenance. Each ammonia feeding pipe is provided with angle steel, so that the ammonia feeding pipes are protected from being abraded, and the service life of the ammonia spraying grid is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of flue gas denitration, and in particular relates to an ammonia spraying grid which is wear-resistant and easy to disassemble. Background Art

[0002] As people's environmental awareness continues to increase, the country's emission standards for nitrogen oxides in industrial furnaces in the power, petroleum, petrochemical, nonferrous, building materials and other industries are constantly improving, and the research and development of denitrification equipment has also been vigorously developed. At present, my country generally uses SCR denitrification, that is, ammonia and air are mixed in a certain proportion and then sprayed into the flue through an ammonia spray grid to denitrify the flue gas. The existing ammonia spray grid will be seriously worn due to the direct impact of the flue gas for a long time during use. In addition, the spray holes of the ammonia spray grid pipe are prone to blockage, which is inconvenient to disassemble, replace and repair, and cannot meet the use requirements.

[0003] Therefore, how to make the ammonia injection grid easy to disassemble and maintain is an urgent problem to be solved in the field of flue gas denitrification technology. Utility Model Content

[0004] In view of the current situation that impurities exist in the ammonia / air mixture, which causes the spray holes to be easily blocked, and the disassembly and maintenance are inconvenient, and the existing ammonia spray grid is seriously worn due to the direct impact of flue gas for a long time during use, the utility model provides a wear-resistant and easy-to-disassemble ammonia spray grid, which has the characteristics of easy disassembly and maintenance, thereby solving the above technical problems.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A wear-resistant and easily disassembled ammonia injection grid is arranged in a flue, and comprises a primary ammonia delivery pipe, a secondary ammonia delivery pipe and a tertiary ammonia delivery pipe which are interconnected. The flue is provided with an outer wall opening, the air inlet end of the primary ammonia delivery pipe passes through the outer wall opening and is arranged outside the flue, the secondary ammonia delivery pipe is connected to the air outlet end of the primary ammonia delivery pipe and is arranged along the radial direction of the flue, and the tertiary ammonia delivery pipe is connected to the secondary ammonia delivery pipe and is arranged along the axial direction of the flue.

[0007] According to a further technical solution, a plurality of secondary ammonia delivery pipes are provided and are evenly and parallelly arranged in the flue, and both ends of each secondary ammonia delivery pipe are connected to the pipe wall of the flue through a steel plate; each secondary ammonia delivery pipe is connected to the gas outlet end of a primary ammonia delivery pipe.

[0008] A further technical solution is that two blind plates are arranged in the secondary ammonia delivery pipe to separate the secondary ammonia delivery pipe into a left-section secondary pipe, a middle-section secondary pipe and a right-section secondary pipe; the primary ammonia delivery pipe includes a left primary pipe, a middle primary pipe and a right primary pipe, and the air inlet ends of the left primary pipe, the middle primary pipe and the right primary pipe are all arranged outside the flue through the outer wall opening; the air outlet end of the left primary pipe is connected to the left-section secondary pipe, the air outlet end of the middle primary pipe is connected to the middle-section secondary pipe, and the air outlet end of the right primary pipe is connected to the right-section secondary pipe.

[0009] A further technical solution is that there are multiple tertiary ammonia delivery pipes, each of which is arranged between two adjacent secondary ammonia delivery pipes, the first end of each tertiary ammonia delivery pipe is connected to the secondary ammonia delivery pipe, and the second end is connected to the adjacent secondary ammonia delivery pipe; the second end is provided with a plug, and each tertiary ammonia delivery pipe is provided with a plurality of nozzles.

[0010] According to a further technical solution, the second end of each of the three-stage ammonia delivery pipes is connected to the adjacent two-stage ammonia delivery pipe through a pipe sleeve, the first end of the pipe sleeve is fixedly connected to the two-stage ammonia delivery pipe, and the second end is inserted into the second end of the three-stage ammonia delivery pipe, and a filler is arranged in the pipe sleeve.

[0011] According to a further technical solution, the filler is glass fiber cloth, which is used to fasten the second end of the tertiary ammonia supply pipe.

[0012] According to a further technical solution, the steel plate is provided with reinforcing ribs for strengthening the connection strength between the secondary ammonia supply pipe and the flue pipe wall.

[0013] According to a further technical solution, the air inlet end of the first-stage ammonia delivery pipe is connected to a dust removal structure.

[0014] According to a further technical solution, angle steels are provided on the first-level ammonia delivery pipe, the second-level ammonia delivery pipe and the third-level ammonia delivery pipe; the angle of the angle steels is 45 degrees to 90 degrees.

[0015] According to a further technical solution, the width of the angle steel is greater than the diameter of the first-level ammonia delivery pipe, the diameter of the second-level ammonia delivery pipe, and the diameter of the third-level ammonia delivery pipe.

[0016] In summary, the above technical scheme has the following beneficial effects: ammonia is delivered into the pipeline through the air inlet end of the first-level ammonia delivery pipe, and then the ammonia is distributed along the radial direction of the flue through the second-level ammonia delivery pipe, and then the ammonia is distributed along the axial direction of the flue through the third-level ammonia delivery pipe, and finally the ammonia is delivered to various positions of the flue through the third-level ammonia delivery pipe. Ammonia is delivered into the flue through multi-level ammonia delivery pipes, and the second-level pipe and the third-level pipe are arranged vertically, so that ammonia can be evenly delivered into the flue. The multi-level pipe has the characteristics of convenient disassembly and assembly, and when the pipelines at each level are damaged, they can be conveniently disassembled for maintenance. In addition, angle steels are set on the windward surfaces of the first-level ammonia delivery pipe, the second-level ammonia delivery pipe and the third-level ammonia delivery pipe to protect the first-level ammonia delivery pipe, the second-level ammonia delivery pipe and the third-level ammonia delivery pipe from wear, thereby extending the service life of the ammonia spray grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the ammonia injection grid of the utility model;

[0018] Figure 2 This is a schematic diagram of the AA cross-section structure of the ammonia injection grid of the utility model;

[0019] Figure 3 This is a schematic diagram of an enlarged view of the B area of ​​the ammonia injection grid of the utility model;

[0020] Figure 4 This is a schematic diagram of an enlarged cross-sectional view of the C area of ​​the ammonia injection grid of the utility model;

[0021] Figure 5 This is a schematic diagram of an enlarged view of the D area of ​​the ammonia injection grid of the utility model;

[0022] Figure 6 This is a schematic diagram of the ash removal structure of the ammonia spraying grid of the utility model;

[0023] Figure 7 This is a schematic diagram of the angle steel structure of the ammonia spraying grid of the utility model.

[0024] Figure numerals: 1. flue; 2. opening in outer wall; 10. primary ammonia delivery pipe; 11. left primary pipe; 12. middle primary pipe; 13. right primary pipe; 14. ash removal structure; 20. secondary ammonia delivery pipe; 21. blind plate; 22. left secondary pipe; 23. middle secondary pipe; 24. right secondary pipe; 30. tertiary ammonia delivery pipe; 31. nozzle; 40. plug; 50. steel plate; 60. pipe sleeve; 61. filler; 70. reinforcing rib; 80. angle steel; 91. ammonia / air mixer; 92. butterfly valve; 93. throttling orifice; 94. needle valve; 95. expansion joint. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0026] The same parts are denoted by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings, and the words "bottom" and "top", "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0027] like Figure 1 and Figure 2 As shown, a wear-resistant and easily disassembled ammonia injection grid is arranged in a flue 1, and includes a primary ammonia delivery pipe 10, a secondary ammonia delivery pipe 20 and a tertiary ammonia delivery pipe 30. The flue 1 is provided with an outer wall opening 2, the air inlet end of the primary ammonia delivery pipe 10 passes through the outer wall opening 2 and is arranged outside the flue 1, the secondary ammonia delivery pipe 20 is connected with the air outlet end of the primary ammonia delivery pipe 10 and is arranged along the radial direction of the flue 1, and the tertiary ammonia delivery pipe 30 is connected with the secondary ammonia delivery pipe 20 and is arranged along the axial direction of the flue 1. Ammonia is delivered into the pipeline through the air inlet end of the primary ammonia delivery pipe 10, and then the ammonia is distributed along the radial direction of the flue 1 through the secondary ammonia delivery pipe 20, and then the ammonia is distributed along the axial direction of the flue 1 through the tertiary ammonia delivery pipe 30, and finally the ammonia is delivered to various positions of the flue 1 through the tertiary ammonia delivery pipe 30. Ammonia is delivered into the flue 1 through multi-stage ammonia delivery pipes, and the secondary pipeline and the tertiary pipeline are arranged vertically, so that ammonia can be evenly delivered into the flue 1. The multi-stage pipeline has the characteristic of convenient disassembly and assembly, and when the pipelines at each stage are damaged, they can be conveniently disassembled for maintenance.

[0028] Two blind plates 21 are arranged in the secondary ammonia delivery pipe 20, so as to separate the secondary ammonia delivery pipe 20 into a left-section secondary pipe 22, a middle-section secondary pipe 23 and a right-section secondary pipe 24; the primary ammonia delivery pipe 10 includes a left primary pipe 11, a middle primary pipe 12 and a right primary pipe 13, and the air inlet ends of the left primary pipe 11, the middle primary pipe 12 and the right primary pipe 13 are all arranged outside the flue 1 through the outer wall opening 2; the air outlet end of the left primary pipe 11 is connected to the left-section secondary pipe 22, the air outlet end of the middle primary pipe 12 is connected to the middle-section secondary pipe 23, and the air outlet end of the right primary pipe 13 is connected to the right-section secondary pipe 24. By separating the secondary pipeline into three sections through the blind plate 21, the situation that the pipeline cannot spray ammonia due to blockage in one place can be avoided, and the influence caused by the blockage can be effectively avoided. At the same time, the setting of multiple sections of pipelines can easily find the specific blockage position of the pipeline. The left primary pipe 11, the middle primary pipe 12 and the right primary pipe 13 are all independently and separately arranged.

[0029] The air inlet end of the middle primary pipe 12 is longer than the length of the left primary pipe 11 and the right primary pipe 13. The air inlet ends of the left primary pipe 11, the middle primary pipe 12 and the right primary pipe 13 are staggered in length, and the air inlet end of the middle primary pipe 12 is located in the middle of the air inlet end of the left primary pipe 11 and the air inlet end of the right primary pipe 13, so that air is taken in from these three air inlet ends. The air inlet ends of the left primary pipe 11, the middle primary pipe 12 and the right primary pipe 13 need to be ventilated, so flanges are provided. If the three air inlet ends are of equal length, a larger outer wall opening 2 is required due to the limitation of the flange. By staggered arrangement of different lengths, the distance between the air inlet ends of the left primary pipe 11, the middle primary pipe 12 and the right primary pipe 13 can be reduced.

[0030] like Figure 3 and Figure 4 As shown, a plurality of three-stage ammonia delivery pipes 30 are provided, the first end of each three-stage ammonia delivery pipe 30 is connected to the two-stage ammonia delivery pipe 20, the second end is provided with a plug 40, and a plurality of nozzles 31 are provided on each three-stage ammonia delivery pipe 30. Each three-stage ammonia delivery pipe 30 is arranged along the axial direction of the flue 1, and the plurality of nozzles 31 are used to spray ammonia gas at various positions in the axial direction of the flue 1.

[0031] There are multiple secondary ammonia delivery pipes 20, which are evenly arranged in parallel in the flue 1. Both ends of each secondary ammonia delivery pipe 20 are connected to the pipe wall of the flue 1 through a steel plate 50; each secondary ammonia delivery pipe 20 is connected to the gas outlet end of a primary ammonia delivery pipe 10; the first end of each tertiary ammonia delivery pipe 30 is connected to a secondary ammonia delivery pipe 20, and the second end is connected to the adjacent secondary ammonia delivery pipe 20. The flue 1 is too long, and multiple second ammonia delivery pipes arranged radially along the flue 1 are used to divide the flue 1 into several areas and complete the ammonia spraying operation in different areas. Each second ammonia delivery pipe is independent of each other, and when blocked, all pipes will not be unable to work.

[0032] The second end of each tertiary ammonia delivery pipe 30 is connected to the adjacent secondary ammonia delivery pipe 20 through a pipe sleeve 60. The first end of the pipe sleeve 60 is fixedly connected to the secondary ammonia delivery pipe 20, and the second end is for the second end of the tertiary ammonia delivery pipe 30 to be inserted. A filler 61 is arranged in the pipe sleeve 60. Each tertiary ammonia delivery pipe 30 is arranged between two secondary ammonia delivery pipes 20. The first end of each tertiary ammonia delivery pipe 30 is connected to the secondary ammonia delivery pipe 20 on one side, and a plug 40 is arranged at the second end, and is connected to the adjacent secondary ammonia delivery pipe 20 through a sleeve. Because both ends of each secondary ammonia delivery pipe 20 are connected to the pipe wall of the flue 1 through a steel plate 50, such an arrangement of each tertiary ammonia delivery pipe 30 can play a supporting role. The filler 61 arranged in the pipe sleeve 60 is a glass fiber cloth, which is used to fasten the second end of the tertiary ammonia delivery pipe 30.

[0033] like Figure 5As shown, both ends of each secondary ammonia delivery pipe 20 connected to the flue 1 may be provided with plugs 40 , and the primary ammonia delivery pipe 10 is connected to each section of the secondary ammonia delivery pipe 20 through the side wall of the secondary ammonia delivery pipe 20 .

[0034] The steel plate 50 is provided with a reinforcing rib 70. The reinforcing rib 70 is used to strengthen the connection strength between the secondary ammonia delivery pipe 20 and the wall of the flue 1.

[0035] like Figure 6 As shown, the air inlet end of the primary ammonia delivery pipe 10 is connected with a dust removal structure 14. The ammonia / air mixer 91 delivers ammonia to the air inlet end of the primary ammonia delivery pipe 10, i.e., the air inlet ends of each left primary pipe 11, middle primary pipe 12 and right primary pipe 13, through an external pipeline. The external pipeline is provided with a butterfly valve 92, a throttling orifice plate 93, a needle valve 94 and an expansion joint 95 and other components that play a control or connection role. The dust removal structure 14 is arranged on the branch pipe of the external pipeline, and is controlled by a valve such as a butterfly valve 92. The dust removal structure 14 is a device that can generate compressed air or steam, and is used to pass compressed air or steam into the external pipeline to purge each primary ammonia delivery pipe 10, secondary ammonia delivery pipe 20 and tertiary ammonia delivery pipe 30, thereby solving the problem that impurities in the ammonia-air mixed gas will block the ammonia spraying grid, and avoiding the blockage of the ammonia spraying grid, resulting in insufficient ammonia spraying for denitration, and the denitration efficiency cannot meet the requirements.

[0036] like Figure 7 As shown, angle steel 80 is arranged on the primary ammonia delivery pipe 10, the secondary ammonia delivery pipe 20 and the tertiary ammonia delivery pipe 30. The flue gas in the flue 1 will wear the primary ammonia delivery pipe 10, the secondary ammonia delivery pipe 20 and the tertiary ammonia delivery pipe 30. Angle steel 80 is arranged on the windward surface of the primary ammonia delivery pipe 10, the secondary ammonia delivery pipe 20 and the tertiary ammonia delivery pipe 30 to protect the primary ammonia delivery pipe 10, the secondary ammonia delivery pipe 20 and the tertiary ammonia delivery pipe 30 from being worn, thereby extending the service life of the ammonia injection grid.

[0037] The angle of the angle steel 80 is 45 degrees to 90 degrees. Preferably, the angle of the angle steel 80 is 90 degrees.

[0038] The width of the angle steel 80 is greater than the diameter of the primary ammonia delivery pipe 10 , the diameter of the secondary ammonia delivery pipe 20 , and the diameter of the tertiary ammonia delivery pipe 30 .

[0039] The ammonia injection grid of the utility model divides the flue 1 into different areas, each area has a plurality of injection holes, and the flow rate of each partition can be independently adjusted and distributed in combination with the concentration of nitrogen oxides in the flue gas, thereby greatly improving the denitrification efficiency.

[0040] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A wear-resistant and easily disassembled ammonia injection grid, arranged in a flue (1), characterized in that: The invention comprises a first-stage ammonia delivery pipe (10), a second-stage ammonia delivery pipe (20) and a third-stage ammonia delivery pipe (30) which are interconnected. The flue (1) is provided with an outer wall opening (2). The air inlet end of the first-stage ammonia delivery pipe (10) passes through the outer wall opening (2) and is arranged outside the flue (1). The second-stage ammonia delivery pipe (20) is connected to the air outlet end of the first-stage ammonia delivery pipe (10) and is arranged along the radial direction of the flue (1). The third-stage ammonia delivery pipe (30) is connected to the second-stage ammonia delivery pipe (20) and is arranged along the axial direction of the flue (1).

2. The wear-resistant and easily disassembled ammonia injection grid according to claim 1, characterized in that: A plurality of the secondary ammonia delivery pipes (20) are provided and are evenly and parallelly arranged in the flue (1); both ends of each of the secondary ammonia delivery pipes (20) are connected to the pipe wall of the flue (1) through a steel plate (50); and each of the secondary ammonia delivery pipes (20) is connected to the gas outlet end of a primary ammonia delivery pipe (10).

3. The wear-resistant and easily disassembled ammonia injection grid according to claim 2, characterized in that: A blind plate (21) is provided inside the secondary ammonia delivery pipe (20) to separate the secondary ammonia delivery pipe (20) into a left secondary pipe (22), a middle secondary pipe (23) and a right secondary pipe (24); The first-stage ammonia delivery pipe (10) comprises a left first-stage pipe (11), a middle first-stage pipe (12) and a right first-stage pipe (13); the air inlet ends of the left first-stage pipe (11), the middle first-stage pipe (12) and the right first-stage pipe (13) are all arranged outside the flue (1) through an outer wall opening (2); the air outlet end of the left first-stage pipe (11) is connected to a left-section secondary pipe (22), the air outlet end of the middle first-stage pipe (12) is connected to a middle-section secondary pipe (23), and the air outlet end of the right first-stage pipe (13) is connected to a right-section secondary pipe (24).

4. The wear-resistant and easily disassembled ammonia injection grid according to claim 1, characterized in that: A plurality of the tertiary ammonia delivery pipes (30) are provided, each of which is provided between two adjacent secondary ammonia delivery pipes (20); a first end of each tertiary ammonia delivery pipe (30) is communicated with the secondary ammonia delivery pipe (20), and a second end is connected to the adjacent secondary ammonia delivery pipe (20); a plug (40) is provided at the second end, and a plurality of nozzles (31) are provided on each tertiary ammonia delivery pipe (30).

5. The wear-resistant and easily disassembled ammonia injection grid according to claim 4, characterized in that: The second end of each of the tertiary ammonia delivery pipes (30) is connected to an adjacent secondary ammonia delivery pipe (20) through a pipe sleeve (60); a first end of the pipe sleeve (60) is fixedly connected to the secondary ammonia delivery pipe (20); a second end of the pipe sleeve (60) is inserted into the second end of the tertiary ammonia delivery pipe (30); and a filler (61) is arranged in the pipe sleeve (60).

6. The wear-resistant and easily disassembled ammonia injection grid according to claim 5, characterized in that: The filler (61) is glass fiber cloth and is used to fasten the second end of the tertiary ammonia delivery pipe (30).

7. The wear-resistant and easily disassembled ammonia injection grid according to claim 2, characterized in that: The steel plate (50) is provided with a reinforcing rib (70) for strengthening the connection strength between the secondary ammonia supply pipe (20) and the wall of the flue (1).

8. The wear-resistant and easily disassembled ammonia injection grid according to claim 1, characterized in that: The air inlet end of the first-level ammonia delivery pipe (10) is connected to an ash removal structure (14).

9. The wear-resistant and easily disassembled ammonia injection grid according to claim 1, characterized in that: Angle steels (80) are provided on the first-level ammonia delivery pipe (10), the second-level ammonia delivery pipe (20) and the third-level ammonia delivery pipe (30); the angle of the angle steels (80) is 45 degrees to 90 degrees.

10. The wear-resistant and easily disassembled ammonia injection grid according to claim 9, characterized in that: The width of the angle steel (80) is greater than the diameter of the first-level ammonia delivery pipe (10), the diameter of the second-level ammonia delivery pipe (20), and the diameter of the third-level ammonia delivery pipe (30).

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