Ammonia spraying grating device for flue gas denitrification

Abstract

The utility model discloses an ammonia injection grating device for flue gas denitration, which relates to the technical field of flue gas denitration equipment and comprises a flue, a first gas inlet is arranged at the bottom of the flue and can be used for flue gas to enter, a second gas inlet is arranged at the bottom of the flue, compressed gas can be introduced into the flue through the second gas inlet, and the flue is communicated with the flue through the compressed gas. According to the ammonia spraying device, the ash blocking cloth is arranged at the upper end of the ammonia spraying pipe, under the supporting of the four supporting rods, the ash blocking cloth can be constructed into a conical structure, the conical structure is small in part and large in top, and the conical structure is arranged on the path where the flue gas flows through, so that when the flue gas flows through the ash blocking cloth, the flue gas flows through the ash blocking cloth, and the flue gas flows through the ash blocking cloth. Due to the shape of the cone, the flue gas can be forced to change the flowing direction and pass through the top of the dust blocking cloth in an accelerated manner, and the acceleration and the direction change are beneficial to generating strong turbulent flow and vortex around the dust blocking cloth, so that the mixing effect of the ammonia gas and the flue gas is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas denitration equipment, in particular to an ammonia injection grid device for flue gas denitration. Background Art

[0002] The ammonia injection grid device for flue gas denitrification is an important facility for reducing nitrogen oxide emissions in flue gas. Its main working principle is to inject ammonia into the flue gas to react with nitrogen oxides to generate harmless nitrogen and water. The device is usually composed of an ammonia injection system, a reaction zone and a grid structure. In the reaction zone, the flue gas passes through a specially designed grid to ensure uniform distribution of ammonia and enhance the removal efficiency of nitrogen oxides. At the same time, the design of the grid structure can effectively reduce the air flow velocity, increase the reaction time, and ensure the full removal of nitrogen oxides. The device is widely used in the power, metallurgy and other industries. It is one of the important technologies for achieving environmental protection goals. By adopting efficient denitrification means, the ammonia injection grid device can not only effectively control air pollution, but also provide technical support for the sustainable development of enterprises.

[0003] A search revealed Chinese patent number CN218590186U, which discloses a flue gas denitrification ammonia grid device. The device comprises an outer wall, a first air inlet, a second air inlet, an ammonia grid tube, and a filter element. The first and second air inlets are arranged parallel to each other on an upper bracket of the outer wall. The ammonia grid tube is vertically fixed to the bracket of the outer wall. The ammonia grid tube is designed with upper and lower nozzles. By providing a filter element, the ammonia grid tube filters the ammonia evenly through the filter element, allowing it to fully react with the airway and flue. The utility model utilizes a motor to rotate the filter element, and the nozzle is positioned within the filter element to prevent compressed air and flue gas from directly impacting the nozzles on the ammonia grid, causing clogging and wear. Compared to existing technologies, this Chinese patent number CN218590186U addresses existing issues such as uneven ammonia concentration during discharge, resulting in inadequate reaction with flue gas; direct impact of flue gas on the ammonia grid tube, which can easily clog the nozzles; severe wear on the ammonia grid tube; and inconvenient replacement and repair.

[0004] However, during actual use of the above device, the nozzle is arranged inside the filter element. Although the rotating filter element can effectively block the flue gas from entering the nozzle during operation, the ammonia gas sprayed out from the relative nozzle will also be affected by the rotating filter element, thereby causing part of the ammonia gas to be affected, thereby reducing the mixing effect of ammonia gas and flue gas. Therefore, an ammonia spray grid device for flue gas denitrification is proposed. Utility Model Content

[0005] The purpose of the utility model is to solve the problem in the prior art that the nozzle is arranged inside the filter element. Although the rotating filter element during operation can effectively block the flue gas from entering the nozzle, the ammonia sprayed from the relative nozzle will also be affected by the rotating filter element, thereby causing part of the ammonia to be affected, thereby reducing the mixing effect of ammonia and flue gas. An ammonia spray grid device for flue gas denitrification is proposed.

[0006] In order to achieve the above object, the utility model adopts the following technical solution: an ammonia injection grid device for flue gas denitrification, the above technical solution further includes a flue, a first air inlet is provided at the bottom of the flue, the first air inlet is for flue gas to enter, a second air inlet is provided at the bottom of the flue, compressed gas can be introduced into the flue through the second air inlet, and the compressed gas introduced into the first air inlet and the second air inlet is mixed with the flue gas;

[0007] An ammonia spraying grid is provided inside the flue, and the ammonia spraying grid can discharge ammonia into the flue, and the sprayed ammonia can react with the flue gas. A spoiler and ash blocking mechanism is also provided on the upper part of the ammonia spraying grid, and the ash blocking cloth provided on the spoiler and ash blocking mechanism can prevent falling ash.

[0008] An air delivery pipe is provided at the bottom of the flue, the upper end of the air delivery pipe is fixedly connected to an ammonia main pipe, an air pump is provided inside the ammonia main pipe, and ammonia can be introduced into the ammonia main pipe through the air delivery pipe.

[0009] A plurality of ammonia branch pipes are connected around the periphery of the ammonia main pipe, and the ammonia branch pipes are communicated with the ammonia main pipe.

[0010] The upper end of the ammonia branch pipe is fixedly connected to three ammonia spray pipes, and the ammonia branch pipes are communicated with the ammonia spray pipes. The upper part of the ammonia spray pipe is provided with several ammonia nozzles, through which ammonia can be sprayed out.

[0011] The spoiler and dust blocking mechanism comprises a fixing plate fixedly connected to the top end of the ammonia injection pipe, and four supporting rods are rotatably connected to the periphery of the fixing plate.

[0012] A dust blocking cloth is fixedly connected to one side of the support rod away from the fixed plate. The dust blocking cloth is made of elastic material and can withstand high temperatures. The dust blocking cloth can form a conical structure with a smaller bottom and a larger top.

[0013] Four servo motors are provided at the upper end of the fixed plate, and an electric telescopic rod is provided at the output end of the servo motor. The servo motor can control the electric telescopic rod to extend and retract, and a movable plate is fixedly connected to the top of the electric telescopic rod;

[0014] A sliding groove is provided in the middle of the support rod, a connecting rod is slidably connected inside the sliding groove, and a movable plate is rotatably connected to a side of the connecting rod away from the sliding groove.

[0015] The utility model has the following beneficial effects:

[0016] 1. In the utility model, a dust blocking cloth is provided at the upper end of the ammonia injection pipe. Under the support of four support rods, the dust blocking cloth can be constructed into a conical structure with a smaller lower part and a larger top. It is arranged on the path through which the flue gas flows. When the flue gas flows through the dust blocking cloth, due to the shape of the cone, the flue gas will be forced to change its flow direction and accelerate through the top of the dust blocking cloth. This acceleration and direction change help to generate strong turbulence and eddy currents around the dust blocking cloth, thereby enhancing the mixing effect of ammonia and flue gas. In addition, the dust blocking cloth can also block upstream dust, making it difficult for it to enter the ammonia nozzle and cause blockage. The turbulent dust blocking mechanism can also drive the dust blocking cloth to expand or contract, thereby adjusting it according to the specific working environment.

[0017] 2. In the present invention, flue gas and compressed gas can be introduced into the flue through the first air inlet and the second air inlet, and ammonia can be transported to the ammonia main pipe through the gas pipe. The air pump provided on the ammonia main pipe can transport ammonia to the ammonia branch pipe. After the ammonia enters the ammonia spray pipe in the ammonia branch pipe, it can be sprayed out from the ammonia nozzle. The sprayed ammonia can be mixed with the flue gas and the compressed gas, thereby reacting. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of an ammonia injection grid device for flue gas denitrification proposed in the utility model;

[0019] Figure 2 This is a schematic diagram of the first structure of the present utility model;

[0020] Figure 3 This is a schematic diagram of the second structure of the present utility model;

[0021] Figure 4 This is a schematic diagram of the third structure in the present utility model;

[0022] Figure 5 This is a schematic diagram of the fourth structure in the present utility model.

[0023] In the figure: 1. Flue; 2. First air inlet; 3. Second air inlet; 4. Gas pipe; 5. Ammonia main pipe; 6. Ammonia branch pipe; 7. Ammonia spray pipe; 8. Dust shield; 9. Ammonia nozzle; 10. Movable plate; 11. Fixed plate; 12. Support rod; 13. Slide; 14. Servo motor; 15. Electric telescopic rod; 16. Connecting rod. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example 1

[0026] like Figure 1-Figure 5 As shown, the present invention proposes an ammonia injection grid device for flue gas denitrification, comprising a flue 1, a first air inlet 2 provided at the bottom of the flue 1, the first air inlet 2 being used for flue gas to enter, a second air inlet 3 provided at the bottom of the flue 1, compressed gas being introduced into the flue 1 through the second air inlet 3, and the compressed gas introduced through the first air inlet 2 and the second air inlet 3 being mixed with the flue gas;

[0027] An ammonia spraying grid is provided inside the flue 1, which can discharge ammonia into the flue 1, and the sprayed ammonia can react with the flue gas. A flow-turbine ash blocking mechanism is also provided on the top of the ammonia spraying grid, and an ash blocking cloth 8 provided on the flow-turbine ash blocking mechanism can prevent falling ash.

[0028] The spoiler dust-blocking mechanism includes a fixed plate 11 fixedly connected to the top of the ammonia injection pipe 7, and four support rods 12 are rotatably connected to the periphery of the fixed plate 11. The support rod 12 is fixedly connected to the dust-blocking cloth 8 on the side away from the fixed plate 11. The dust-blocking cloth 8 is made of elastic material and can withstand high temperatures. The dust-blocking cloth 8 can form a conical structure with a smaller bottom and a larger top. Four servo motors 14 are provided at the upper end of the fixed plate 11, and an electric telescopic rod 15 is provided at the output end of the servo motor 14. The servo motor 14 can control the electric telescopic rod 15 to extend and retract. The top of the electric telescopic rod 15 is fixedly connected to a movable plate 10, and a slide groove 13 is provided in the middle of the support rod 12. The slide groove 13 is slidably connected to a connecting rod 16, and the connecting rod 16 is rotatably connected to the movable plate 10 on the side away from the slide groove 13.

[0029] In this embodiment, a dust barrier 8 is provided at the upper end of the ammonia injection pipe 7. Supported by four support rods 12, the dust barrier 8 can be constructed into a conical structure and arranged in the path of the flue gas flow. The dust barrier 8 is smaller at the bottom and larger at the top. When the flue gas flows through the dust barrier 8, due to the cone shape, the flue gas is forced to change its flow direction and accelerate through the top of the dust barrier 8. This acceleration and direction change help to generate strong turbulence and eddy currents around the dust barrier 8, thereby enhancing the mixing effect of ammonia and flue gas.

[0030] Moreover, the conical structure of the dust blocking cloth 8 can also block upstream dust, making it difficult for it to enter the ammonia nozzle 9 and cause blockage. By starting the servo motor 14, the electric telescopic rod 15 can be driven to extend and retract. The extension and retraction of the electric telescopic rod 15 can drive the fixedly connected movable plate 10 to move, and the movement of the movable plate 10 can drive the rotatably connected connecting rod 16 to rotate. The connecting rod 16 rotates away from the side of the movable plate 10 and can slide along the slide groove 13, thereby driving the support rod 12 to rotate. The rotation of the support rod 12 can drive the dust blocking cloth 8 to extend or retract, so that the dust blocking cloth 8 can adjust the extension angle according to the specific working environment, thereby optimizing the mixing effect.

[0031] Example 2

[0032] like Figure 1-Figure 5 As shown, based on the first embodiment, a gas pipe 4 is provided at the bottom of the flue 1, and an ammonia main pipe 5 is fixedly connected to the upper end of the gas pipe 4. An air pump is provided inside the ammonia main pipe 5. Ammonia gas can be introduced into the ammonia main pipe 5 through the gas pipe 4. Several ammonia branch pipes 6 are connected to the periphery of the ammonia main pipe 5, and the ammonia branch pipes 6 are connected to the ammonia main pipe 5.

[0033] The upper end of the ammonia branch pipe 6 is fixedly connected to three ammonia injection pipes 7, and the ammonia branch pipe 6 is communicated with the ammonia injection pipe 7. A plurality of ammonia nozzles 9 are opened on the upper part of the ammonia injection pipe 7, and ammonia can be sprayed out through the ammonia nozzles 9.

[0034] In this embodiment, when in use, the flue gas and the compressed gas are first introduced into the flue 1 through the first air inlet 2 and the second air inlet 3, the flue gas and the compressed gas mix and rise, and then ammonia is introduced into the ammonia main pipe 5 through the gas pipe 4. Driven by the air pump provided inside the ammonia main pipe 5, the ammonia enters the ammonia branch pipe 6. Through the ammonia branch pipe 6, the ammonia can enter the ammonia spray pipe 7 and be sprayed out through the ammonia nozzle 9 provided on the ammonia spray pipe 7. The ammonia spray pipe 7 is provided with ammonia nozzles 9 in various directions. Ammonia can be evenly sprayed to the surroundings through the ammonia nozzles 9. The sprayed ammonia can be mixed with the flue gas and the compressed gas, thereby reacting.

[0035] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ammonia injection grid device for flue gas denitrification, comprising a flue (1), characterized in that: The flue (1) is provided with a first air inlet (2) at the bottom thereof, and the first air inlet (2) is for flue gas to enter. The flue (1) is provided with a second air inlet (3) at the bottom thereof, and compressed gas can be introduced into the flue (1) through the second air inlet (3). The compressed gas introduced through the first air inlet (2) and the second air inlet (3) is mixed with the flue gas. An ammonia spraying grid is provided inside the flue (1), and the ammonia spraying grid can discharge ammonia into the flue (1), and the sprayed ammonia can react with the flue gas. A flow-turbine dust-blocking mechanism is also provided on the upper part of the ammonia spraying grid, and a dust-blocking cloth (8) provided on the flow-turbine dust-blocking mechanism can prevent falling dust.

2. The ammonia injection grid device for flue gas denitrification according to claim 1, characterized in that: The bottom of the flue (1) is provided with an air delivery pipe (4), the upper end of the air delivery pipe (4) is fixedly connected to an ammonia main pipe (5), an air pump is provided inside the ammonia main pipe (5), and ammonia can be introduced into the ammonia main pipe (5) through the air delivery pipe (4).

3. The ammonia injection grid device for flue gas denitrification according to claim 2, characterized in that: The ammonia main pipe (5) is surrounded by a plurality of ammonia branch pipes (6) connected thereto, and the ammonia branch pipes (6) are in communication with the ammonia main pipe (5).

4. The ammonia injection grid device for flue gas denitrification according to claim 3, characterized in that: The upper end of the ammonia branch pipe (6) is fixedly connected to three ammonia spray pipes (7), and the ammonia branch pipe (6) is communicated with the ammonia spray pipe (7). The upper part of the ammonia spray pipe (7) is provided with a plurality of ammonia nozzles (9), and ammonia can be sprayed out through the ammonia nozzles (9).

5. The ammonia injection grid device for flue gas denitrification according to claim 1, characterized in that: The spoiler and dust blocking mechanism comprises a fixed plate (11) fixedly connected to the top end of the ammonia injection pipe (7), and four support rods (12) are rotatably connected to the periphery of the fixed plate (11).

6. The ammonia injection grid device for flue gas denitrification according to claim 5, characterized in that: A dust blocking cloth (8) is fixedly connected to the side of the support rod (12) away from the fixed plate (11). The dust blocking cloth (8) is made of elastic material and can withstand high temperatures. The dust blocking cloth (8) can form a conical structure with a smaller bottom and a larger top.

7. The ammonia injection grid device for flue gas denitrification according to claim 5, characterized in that: Four servo motors (14) are provided at the upper end of the fixed plate (11), and an electric telescopic rod (15) is provided at the output end of the servo motor (14). The servo motor (14) can control the electric telescopic rod (15) to extend and retract, and the top of the electric telescopic rod (15) is fixedly connected to a movable plate (10).

8. The ammonia injection grid device for flue gas denitrification according to claim 5, characterized in that: A sliding groove (13) is provided in the middle of the support rod (12), a connecting rod (16) is slidably connected inside the sliding groove (13), and the connecting rod (16) is rotatably connected to the movable plate (10) at the side away from the sliding groove (13).

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