Efficient SNCR (selective non-catalytic reduction) denitration spray gun

Abstract

The utility model provides an efficient SNCR (selective non-catalytic reduction) denitration spray gun which comprises a gun body, one end of the gun body is connected with a gun barrel through a mounting seat, the gun body and the gun barrel are mounted in a furnace wall, and a damping structure is arranged on the surface of the gun barrel and used for buffering vibration between the furnace wall and the spray gun. The top of the gun body is provided with a first spray head communicated with an inner cavity of the gun body, the top of the first spray head is covered with a second spray head, one side of the gun body is communicated with an air inlet pipe and a liquid inlet pipe, one end of the air inlet pipe is communicated with compressed air, and one end of the liquid inlet pipe is communicated with liquid ammonia. By arranging the first spray head and the second spray head, liquid ammonia is atomized by the first spray head, and the atomized liquid ammonia is converged through the second spray head, enters the front spray hole of the second spray head and then is sprayed forwards, so that the spraying range of the liquid ammonia is increased, the liquid ammonia is sprayed into a reaction center, the reaction area of the liquid ammonia is increased, and the spraying range of the liquid ammonia is farther; and the SNCR denitration reaction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of SNCR denitration, in particular to a high-efficiency SNCR denitration spray gun. Background Art

[0002] SNCR, or selective non-catalytic reduction technology, is a denitrification technology that does not use a catalyst but injects an amino reductant at an appropriate position in the boiler furnace or at the inlet of a cyclone separator to reduce NOx to N2. The SNCR denitrification spray gun is a component of the injection system. Liquid ammonia and compressed air are mixed through the spray gun to increase the flow rate of the liquid ammonia and atomize the liquid ammonia at the same time. The structure of the existing SNCR denitrification spray gun has the following shortcomings: the existing nozzle only has an atomization function, and the liquid ammonia is discharged from the circumferential edge of the nozzle. The liquid ammonia injection distance is very short, and most of the liquid ammonia does not react, resulting in a very low reaction efficiency of the existing SNCR denitrification spray gun. Utility Model Content

[0003] The problem to be solved by the utility model is that the liquid ammonia injection distance is short and the reaction efficiency is low.

[0004] In order to solve the above technical problems, the utility model provides a high-efficiency SNCR denitrification spray gun, including a gun body, one end of the gun body is connected to a gun barrel through a mounting seat, the gun body and the gun barrel are installed in a furnace wall, a shock absorbing structure is provided on the surface of the gun barrel for buffering the vibration between the furnace wall and the spray gun, a first nozzle connected to the inner cavity of the gun body is provided on the top of the gun body, and a second nozzle is provided on the top cover of the first nozzle.

[0005] Preferably, one side of the gun body is connected with an air inlet pipe and a liquid inlet pipe, one end of the air inlet pipe is connected with compressed air, and one end of the liquid inlet pipe is connected with liquid ammonia.

[0006] Preferably, the shock absorbing structure comprises a mounting block and a connecting block, one end of the connecting block is mounted to the mounting block via an elastic member, the gun barrel passes through the middle of the mounting block and the connecting block, and there are two shock absorbing structures which are respectively mounted to both ends of the furnace wall.

[0007] Preferably, the elastic members are springs, the number of the elastic members is four and they are arranged in a circumferential array along the connection block.

[0008] Preferably, a threaded portion is provided on the surface of the first nozzle, the first nozzle is communicated with the inner cavity of the second nozzle, and one end of the second nozzle is threadedly connected to the threaded portion.

[0009] Preferably, the second nozzle comprises a diffuser and an extension portion, the top of the diffuser is mounted on the extension portion, and one end of the extension portion away from the diffuser is threadedly connected to the threaded portion.

[0010] Preferably, the diffusion portion is arc-shaped, and a plurality of diffusion holes are formed on the top of the diffusion portion, and the sizes of the plurality of diffusion holes gradually decrease from the top to the circumferential edge.

[0011] Preferably, a connecting hole slidably connected to the connecting block is provided in the middle of the mounting block.

[0012] Preferably, one end of the connecting block is located inside the connecting hole.

[0013] Preferably, a support plate mounted on the bottom of the elastic member is provided at the bottom of the mounting block.

[0014] Compared with the prior art, the utility model provides a high-efficiency SNCR denitrification spray gun, which has the following beneficial effects:

[0015] 1. The utility model sets a first nozzle and a second nozzle. The first nozzle atomizes liquid ammonia. The atomized liquid ammonia enters the second nozzle, so that the atomized liquid ammonia converges through the second nozzle, and then enters the front injection hole of the second nozzle, and then sprays forward, thereby increasing the range of liquid ammonia, so that the liquid ammonia is sprayed into the reaction center, and the reaction area of ​​the liquid ammonia is increased. Compared with the existing spray gun, the liquid ammonia range is farther, so that the SNCR denitration reaction efficiency is improved. By setting a shock-absorbing structure, the gun barrel is installed on the furnace wall through the shock-absorbing structure. When the compressed air and liquid ammonia are turned on and off, the pressure in the gun barrel increases, which will cause vibration between the gun body, the gun barrel and the furnace wall, and the vibration effect is buffered by the shock-absorbing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the main structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the shock absorbing structure of the utility model;

[0018] Figure 3 It is a schematic diagram of the connection structure of the first nozzle and the second nozzle of the utility model.

[0019] In the figure: 1. gun body; 2. gun barrel; 3. shock absorbing structure; 31. mounting block; 32. connecting block; 33. elastic member; 4. first nozzle; 5. second nozzle; 51. diffuser; 52. extension; 6. air inlet pipe; 7. liquid inlet pipe; 8. threaded part; 9. diffuser hole; 10. connecting hole; 11. support plate. DETAILED DESCRIPTION

[0020] The utility model relates to a high-efficiency SNCR denitrification spray gun, such as Figure 1-3As shown, it includes a gun body 1, one end of the gun body 1 is connected to a gun barrel 2 through a mounting seat, the gun body 1 and the gun barrel 2 are installed in the furnace wall, a shock absorbing structure 3 is provided on the surface of the gun barrel 2 for buffering the vibration between the furnace wall and the spray gun, a first nozzle 4 connected to the inner cavity of the gun body 1 is provided on the top of the gun body 1, and a second nozzle 5 is provided on the top cover of the first nozzle 4. By arranging the gun body 1 and the gun barrel 2, the gun body 1 and one end of the gun barrel 2 are connected, and one side of the gun body 1 is connected to liquid ammonia and compressed air. The compressed air and liquid ammonia meet, and the compressed air pushes the liquid ammonia into the gun barrel 2. By arranging the shock absorbing structure 3, the gun barrel 2 is connected to the furnace wall through the shock absorbing structure 3. When the compressed air and liquid ammonia are turned on and off, the pressure in the gun barrel 2 increases, which will cause vibration between the gun body 1, the gun barrel 2 and the furnace wall. The vibration effect is buffered by the shock-absorbing structure 3. The first nozzle 4 is provided to atomize the liquid ammonia, and the atomized liquid ammonia enters the second nozzle 5. The second nozzle 5 is provided to allow the atomized liquid ammonia to converge through the second nozzle 5, and then enter the front injection hole of the second nozzle 5, and then be injected forward, thereby increasing the range of the liquid ammonia, allowing the liquid ammonia to be injected into the reaction center, increasing the reaction area of ​​the liquid ammonia, and compared with the existing spray guns, the liquid ammonia range is farther, thereby improving the SNCR denitration reaction efficiency.

[0021] In an embodiment of the utility model, one side of the gun body 1 is connected with an air inlet pipe 6 and a liquid inlet pipe 7, one end of the air inlet pipe 6 is connected with compressed air, and one end of the liquid inlet pipe 7 is connected with liquid ammonia. By setting the air inlet pipe 6 and the liquid inlet pipe 7, compressed air enters the gun body 1 from the air inlet pipe 6, and liquid ammonia enters the gun body 1 from the liquid inlet pipe 7.

[0022] In the embodiment of the utility model, the shock absorbing structure 3 includes a mounting block 31 and a connecting block 32, one end of the connecting block 32 is mounted on the mounting block 31 through an elastic member 33, the gun barrel 2 passes through the middle of the mounting block 31 and the connecting block 32, the number of the shock absorbing structures 3 is two and they are respectively mounted on the two ends of the furnace wall, by arranging the mounting block 31, the connecting block 32 and the elastic member 33, the mounting block 31 and the outer surface of the gun barrel 2 and the furnace wall are mounted and fixed, the connecting block 32 is connected to the mounting block 31 through the elastic member 33, the inner cavity of the connecting block 32 is mounted and fixed on the outer surface of the gun body 1, the axial direction of the gun body 1 vibrates, driving the connecting block 32 to vibrate, the elastic member 33 buffers the vibration effect, and at the same time, the shock absorbing structure 3 can also avoid wear and collision between the gun body 1, the gun barrel 2 and the furnace wall, thereby improving the service life of the spray gun.

[0023] In the embodiment of the utility model, the elastic member 33 is a spring, the number of the elastic members 33 is four and they are arranged in a circumferential array along the connecting block 32. By arranging the spring, the spring is made of a high temperature resistant and corrosion resistant material, so that it is suitable for use in a high temperature and highly corrosive environment.

[0024] In an embodiment of the utility model, a threaded portion 8 is provided on the surface of the first nozzle 4, the first nozzle 4 is communicated with the inner cavity of the second nozzle 5, one end of the second nozzle 5 is threadedly connected to the threaded portion 8, and by providing the threaded portion 8, the first nozzle 4 and the second nozzle 5 are threadedly connected, so that the first nozzle 4 and the second nozzle 5 can be detachably installed, which not only improves the operability, but also facilitates the replacement and maintenance of the first nozzle 4 and the second nozzle 5.

[0025] In an embodiment of the utility model, the second nozzle 5 includes a diffuser 51 and an extension 52, the top of the diffuser 51 is installed with the extension 52, and one end of the extension 52 away from the diffuser 51 is threadedly connected with the threaded portion 8. By arranging the diffuser 51 and the extension 52, the atomized liquid ammonia sprayed from the first nozzle 4 is gathered through the extension 52, and the liquid ammonia is blocked from spraying toward the rear and sides of the first nozzle 4. The gathered atomized liquid ammonia is sprayed toward the front of the second nozzle 5 through the diffuser 51, thereby increasing the range of the liquid ammonia.

[0026] In an embodiment of the utility model, the diffuser 51 is arc-shaped, and a plurality of diffuser holes 9 are provided at the top of the diffuser 51. The sizes of the plurality of diffuser holes 9 gradually decrease from the top to the circumferential edge. By setting the above structure, the atomized liquid ammonia is evenly dispersed through the diffuser 51 and the diffuser holes 9. The atomized liquid ammonia entering the second nozzle 5 from the extension portion 52 has a weakened atomization effect at the circumferential edge portion, and the diffuser holes 9 can ensure a uniform atomization effect.

[0027] In the embodiment of the utility model, a connecting hole 10 slidably connected to the connecting block 32 is opened in the middle of the mounting block 31. By providing the connecting hole 10, one end of the connecting block 32 moves into the connecting hole 10, thereby improving the stability of the connecting block 32.

[0028] In the embodiment of the utility model, one end of the connecting block 32 is located inside the connecting hole 10. By setting the above structure, one end of the connecting block 32 can be engaged and connected with the connecting hole 10, thereby improving the stability of the connecting block 32 and the mounting block 31.

[0029] In an embodiment of the utility model, a support plate 11 installed with the bottom of the elastic member 33 is provided at the bottom of the mounting block 31. By providing the support plate 11, one end of the elastic member 33 is installed with the support plate 11, so that the elastic member 33 is fixed in a direction perpendicular to the connecting hole 10, so that the stability of the elastic member 33 is improved.

[0030] When in use, first, the gun barrel 2 and the furnace wall are fixed, and the shock absorbing structure 3 is installed at both ends of the gun barrel 2 respectively. At the same time, the mounting block 31 and the two ends of the furnace wall are fixed, and compressed air and liquid ammonia are respectively injected into the air inlet pipe 6 and the liquid inlet pipe 7. When the compressed air and liquid ammonia are turned on and off, the pressure in the gun barrel 2 increases, causing the spray gun and the furnace wall to vibrate, causing vibration between the gun body 1 and the gun barrel 2 and the furnace wall. The gun barrel 2 drives the connecting block 32 to vibrate, and the connecting block 32 drives the elastic member 33 to move toward the mounting block 31. The elastic member 33 buffers the vibration effect, and the compressed air pushes the liquid ammonia into the gun barrel 2, and then passes through the first nozzle 4, so that the liquid liquid ammonia becomes atomized liquid ammonia, and the atomized liquid ammonia enters the second nozzle 5, and the atomized liquid ammonia is gathered through the extension part 52, and then the atomized liquid ammonia is uniformly sprayed forward through the diffusion part 51.

[0031] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A high-efficiency SNCR denitrification spray gun, comprising a gun body (1), characterized in that: One end of the gun body (1) is connected to a gun barrel (2) via a mounting seat; the gun body (1) and the gun barrel (2) are mounted in a furnace wall; a shock absorbing structure (3) is provided on the surface of the gun barrel (2) for buffering vibration between the furnace wall and the spray gun; a first nozzle (4) connected to the inner cavity of the gun body (1) is provided on the top of the gun body (1); a second nozzle (5) is provided on the top cover of the first nozzle (4).

2. A high-efficiency SNCR denitrification spray gun according to claim 1, characterized in that: One side of the gun body (1) is connected to an air inlet pipe (6) and a liquid inlet pipe (7); one end of the air inlet pipe (6) is connected to compressed air, and one end of the liquid inlet pipe (7) is connected to liquid ammonia.

3. A high-efficiency SNCR denitrification spray gun according to claim 2, characterized in that: The shock absorbing structure (3) comprises a mounting block (31) and a connecting block (32); one end of the connecting block (32) is mounted on the mounting block (31) via an elastic member (33); the gun barrel (2) passes through the middle of the mounting block (31) and the connecting block (32); and the number of the shock absorbing structures (3) is two and they are respectively mounted on the two ends of the furnace wall.

4. A high-efficiency SNCR denitrification spray gun according to claim 3, characterized in that: The elastic members (33) are springs. The number of the elastic members (33) is four and they are arranged in a circumferential array along the connection block (32).

5. A high-efficiency SNCR denitrification spray gun according to claim 4, characterized in that: A threaded portion (8) is provided on the surface of the first nozzle (4); the first nozzle (4) is communicated with the inner cavity of the second nozzle (5); and one end of the second nozzle (5) is threadedly connected to the threaded portion (8).

6. A high-efficiency SNCR denitrification spray gun according to claim 5, characterized in that: The second nozzle (5) comprises a diffuser (51) and an extension (52), the top of the diffuser (51) is mounted on the extension (52), and one end of the extension (52) away from the diffuser (51) is threadedly connected to the threaded portion (8).

7. A high-efficiency SNCR denitrification spray gun according to claim 6, characterized in that: The diffusion portion (51) is arc-shaped, and a plurality of diffusion holes (9) are provided at the top of the diffusion portion (51), and the sizes of the plurality of diffusion holes (9) gradually decrease from the top to the circumferential edge.

8. The high-efficiency SNCR denitrification spray gun according to claim 3, characterized in that: A connection hole (10) is provided in the middle of the installation block (31) and is slidably connected to the connection block (32).

9. The high-efficiency SNCR denitrification spray gun according to claim 8, characterized in that: One end of the connection block (32) is located inside the connection hole (10).

10. The high-efficiency SNCR denitrification spray gun according to claim 3, characterized in that: The bottom of the mounting block (31) is provided with a support plate (11) mounted on the bottom of the elastic member (33).

Images