Denitration device for coal-fired flue gas emission treatment

Abstract

The utility model discloses a denitration device for coal-fired flue gas emission treatment, which relates to the technical field of denitration, and comprises a mixing pipe, a gas distribution component is fixedly arranged on the inner wall of the mixing pipe, the gas distribution component consists of a base disc, a plurality of gas guide pipes and a gas distribution net, the gas guide pipes are uniformly and fixedly inserted on the wall body of the base disc, and the gas distribution net is arranged on the base disc. The multiple gas distribution nets are fixedly installed on the inner walls of the multiple gas guide pipes correspondingly, the gas distribution assembly is arranged in the mixing pipe, coal-fired flue gas rushing into the mixing pipe can be evenly dispersed, and therefore the coal-fired flue gas can be evenly distributed in the mixing pipe, the coal-fired flue gas can make full contact with a reducing agent, and the reducing agent can be effectively reduced. By arranging the mixing assembly in the mixing pipe, the coal-fired flue gas can be mixed with the reducing agent, so that the coal-fired flue gas is further in full contact with the reducing agent, the denitration effect of the coal-fired flue gas is relatively good, and meanwhile, the denitration efficiency of the coal-fired flue gas is relatively high.

Description

Technical Field

[0001] This utility model relates to the field of denitrification technology, and in particular to a denitrification device for treating coal-fired flue gas emissions. Background Technology

[0002] Flue gas denitrification (FGD) refers to the process of removing nitrogen oxides from the flue gas produced by coal combustion. Nitrogen oxides are one of the main sources of air pollution, therefore FGD is of great significance for improving air quality. Selective catalytic reduction (SCR) is one type of FGD technology. A reducing agent is injected into the flue gas duct downstream of the boiler at a temperature of 300-400 degrees Celsius. Under the action of a catalyst, the nitrogen oxides in the flue gas are reduced to harmless nitrogen and water. In existing technologies, most coal-fired flue gas flows directly into the mixing pipe through pipelines. This leads to excessive concentration of the flue gas within the mixing pipe, making it difficult for the flue gas to fully contact the reducing agent injected into the mixing pipe. Consequently, the FGD effect is poor, resulting in low FGD efficiency. Utility Model Content

[0003] The main objective of this invention is to provide a denitrification device for treating flue gas emissions from coal combustion, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A denitrification device for treating flue gas emissions from coal combustion includes a mixing pipe. An air distribution assembly is fixedly installed on the inner wall of the mixing pipe. The air distribution assembly consists of a base plate, air guide pipes, and air distribution nets. Several air guide pipes are uniformly and fixedly inserted into the wall of the base plate. Several air distribution nets are respectively fixedly installed on the inner walls of several air guide pipes. A first support is fixedly installed on the inner wall of the mixing pipe, behind the air distribution assembly. A mixing assembly is installed on the mixing pipe and the first support. The mixing assembly consists of a base column, mixing blades, a rotating shaft, transmission bevel gears, drive bevel gears, a mounting shaft, and a motor. Several mixing blades are arranged in a ring on the outer wall of the base column. The rotating shaft is fixedly installed at the front end of the base column. The transmission bevel gears are fixedly installed at the front end of the rotating shaft. The drive bevel gears mesh with the transmission bevel gears. The mounting shaft is fixedly installed at the upper end of the drive bevel gears. The output shaft of the motor is fixedly connected to the mounting shaft.

[0006] Preferably, an SCR reactor is fixedly installed at the rear end of the mixing tube, a reducing agent spray gun is inserted into the mixing tube, and the reducing agent spray gun is located between the gas distribution assembly and the first support. A second support is fixedly installed on the outer wall of the mixing tube.

[0007] Preferably, the first bracket has a shaft hole that passes through the first bracket from front to back.

[0008] Preferably, the base plate on the air distribution assembly is fixedly connected to the inner wall of the mixing pipe.

[0009] Preferably, the base column and mixing blades on the mixing assembly are both located on the rear side of the first support, the rotating shaft is rotatably installed in the shaft hole opened on the first support, the transmission bevel gear is located on the front side of the first support, and the mixing blades are fixedly connected to the base column.

[0010] Preferably, the mounting shaft on the mixing assembly passes through the mixing tube and the wall of the second bracket, and the motor is fixedly mounted on the second bracket.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] By installing a gas distribution component inside the mixing pipe, the flue gas entering the mixing pipe can be evenly dispersed, thus ensuring that the flue gas is evenly distributed within the mixing pipe. This allows the flue gas to fully contact the reducing agent. Furthermore, by installing a mixing component inside the mixing pipe, the flue gas and the reducing agent can be mixed, further ensuring sufficient contact between the flue gas and the reducing agent. This results in better denitrification of the flue gas and higher denitrification efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the internal structure of the mixing tube of this utility model after it has been cut open.

[0015] Figure 3 This is a schematic diagram of the structure of the mixing tube and the first support of this utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the hybrid component of this utility model;

[0017] Figure 5 This is a schematic diagram of the air distribution component of this utility model.

[0018] In the diagram: 1. Mixing pipe; 2. SCR reactor; 3. Gas distribution assembly; 4. Mixing assembly; 5. Reducing agent spray gun; 6. First support; 7. Second support; 8. Shaft hole; 9. Base plate; 10. Gas guide pipe; 11. Gas distribution net; 12. Base column; 13. Mixing blade; 14. Rotating shaft; 15. Transmission bevel gear; 16. Drive bevel gear; 17. Mounting shaft; 18. Motor. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, a denitrification device for treating coal-fired flue gas emissions includes a mixing pipe 1. An air distribution assembly 3 is fixedly installed on the inner wall of the mixing pipe 1. The air distribution assembly 3 consists of a base plate 9, air guide pipes 10, and air distribution nets 11. Several air guide pipes 10 are evenly and fixedly inserted into the wall of the base plate 9. Several air distribution nets 11 are respectively fixedly installed on the inner walls of several air guide pipes 10. A first support 6 is fixedly installed on the inner wall of the mixing pipe 1, behind the air distribution assembly 3. Various components are installed on the mixing pipe 1 and the first support 6. The mixing assembly 4 consists of a base column 12, mixing blades 13, a rotating shaft 14, a transmission bevel gear 15, a drive bevel gear 16, a mounting shaft 17, and a motor 18. Several mixing blades 13 are arranged in a ring on the outer wall of the base column 12. The rotating shaft 14 is fixedly mounted at the front end of the base column 12. The transmission bevel gear 15 is fixedly mounted at the front end of the rotating shaft 14, and the drive bevel gear 16 meshes with the transmission bevel gear 15. The mounting shaft 17 is fixedly mounted on the upper end of the drive bevel gear 16. The output shaft of the motor 18 is fixed to the mounting shaft 17. The mixing pipe 1 is connected to an SCR reactor 2 fixedly installed at its rear end. A reducing agent spray gun 5 is inserted into the mixing pipe 1, and the reducing agent spray gun 5 is located between the gas distribution assembly 3 and the first support 6. A second support 7 is fixedly installed on the outer wall of the mixing pipe 1. When denitrifying the coal-fired flue gas, the coal-fired flue gas can be sent into the mixing pipe 1. Then, the coal-fired flue gas will pass through the gas distribution assembly 3. At this time, the gas distribution assembly 3 can evenly disperse the coal-fired flue gas in the mixing pipe 1. At the same time, the reducing agent spray gun 5 can be activated, and the reducing agent spray gun 5 can be activated. The reducing agent is sprayed into the mixing pipe 1 by the spray gun 5, where it comes into contact with the flue gas. Then, the flue gas and the reducing agent pass through the mixing component 4, where they are mixed. This ensures that the flue gas and the reducing agent are in full contact. The mixture then moves into the SCR reactor 2, where the ammonia reacts with the nitrogen oxides in the flue gas under the action of the catalyst. The nitrogen and water produced are discharged from the system along with the flue gas, thus achieving effective removal of nitrogen oxides.

[0021] Therefore, by setting the gas distribution component 3 in the mixing pipe 1, the coal-fired flue gas flowing into the mixing pipe 1 can be evenly dispersed, so that the coal-fired flue gas is evenly distributed in the mixing pipe 1, and thus the coal-fired flue gas can fully contact the reducing agent. By setting the mixing component 4 in the mixing pipe 1, the coal-fired flue gas and the reducing agent can be mixed, so that the coal-fired flue gas and the reducing agent can be fully contacted, thus the denitrification effect of the coal-fired flue gas is better, and the denitrification efficiency of the coal-fired flue gas is also higher.

[0022] Specifically, the base plate 9 on the gas distribution assembly 3 is fixedly connected to the inner wall of the mixing pipe 1. When the coal-fired flue gas passes through the gas distribution assembly 3, the coal-fired flue gas first enters the base plate 9, and then the coal-fired flue gas in the base plate 9 enters multiple gas guide pipes 10, so that the coal-fired flue gas is evenly distributed in the mixing pipe 1 by multiple gas guide pipes 10.

[0023] Specifically, the first support 6 has a shaft hole 8 that passes through the first support 6 from front to back. The base column 12 and mixing blade 13 on the mixing component 4 are both located on the rear side of the first support 6. The rotating shaft 14 is rotatably installed in the shaft hole 8 on the first support 6. The transmission bevel gear 15 is located on the front side of the first support 6. The mounting shaft 17 on the mixing component 4 passes through the mixing pipe 1 and the wall of the second support 7. The motor 18 is fixedly installed on the second support 7. The mixing blade 13 is fixedly connected to the base column 12. When the flue gas and reducing agent pass through the mixing component 4, the motor 18 can be started. At this time, the motor 18 will drive the driving bevel gear 16 to rotate through the mounting shaft 17. The driving bevel gear 16 will then drive the rotating shaft 14, the base column 12 and the mixing blade 13 to rotate on the first support 6 through the transmission bevel gear 15. As the mixing blade 13 slowly rotates, it will drive the flue gas and reducing agent to mix and contact fully.

[0024] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A denitration device for coal-fired flue gas emission treatment, comprising a mixing pipe (1), characterized in that: The inner wall of the mixing pipe (1) is fixedly installed with a gas distribution assembly (3), the gas distribution assembly (3) is composed of a base disc (9), a gas guide pipe (10) and a gas distribution net (11), the gas guide pipe (10) is several and is uniformly fixedly inserted on the wall body of the base disc (9), the gas distribution net (11) is several and is fixedly installed on the inner wall of the gas guide pipe (10), the inner wall of the mixing pipe (1) and behind the gas distribution assembly (3) is fixedly installed with a first support (6), the mixing pipe (1) and the first support (6) are installed with a mixing assembly (4), the mixing assembly (4) is composed of a base column (12), a mixing blade (13), a rotating shaft (14), a transmission bevel gear (15), a driving bevel gear (16), an installation shaft (17) and a motor (18), the mixing blade (13) is several and is annularly distributed on the outer wall of the base column (12), the rotating shaft (14) is fixedly installed at the front end of the base column (12), the transmission bevel gear (15) is fixedly installed at the front end of the rotating shaft (14), the driving bevel gear (16) is engaged with the transmission bevel gear (15), the installation shaft (17) is fixedly installed at the upper end of the driving bevel gear (16), and the output shaft of the motor (18) is fixedly connected with the installation shaft (17).

2. The device for flue gas desulfurization according to claim 1, characterized in that: The rear end of the mixing pipe (1) is fixedly installed with an SCR reactor (2), the mixing pipe (1) is inserted with a reducing agent spray gun (5), and the reducing agent spray gun (5) is located between the gas distribution assembly (3) and the first support (6) at the same time, and the outer wall of the mixing pipe (1) is fixedly installed with a second support (7).

3. The device for flue gas desulfurization according to claim 2, characterized in that: The first support (6) is provided with an axle hole (8), and the axle hole (8) penetrates the first support (6) front and back.

4. The device for flue gas desulfurization according to claim 3, characterized in that: The base disc (9) of the gas distribution assembly (3) is fixedly connected with the inner wall of the mixing pipe (1).

5. The device for flue gas desulfurization according to claim 4, characterized in that: The base column (12) and the mixing blade (13) of the mixing assembly (4) are located at the rear side of the first support (6), the rotating shaft (14) is rotatably installed in the axle hole (8) of the first support (6), the transmission bevel gear (15) is located at the front side of the first support (6), and the mixing blade (13) is fixedly connected with the base column (12).

6. The device for flue gas desulfurization according to claim 5, characterized in that: The installation shaft (17) of the mixing assembly (4) penetrates the wall body of the mixing pipe (1) and the second support (7), and the motor (18) is fixedly installed on the second support (7).

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