Airflow uniform distribution device of SCR (Selective Catalytic Reduction) denitration reactor

Abstract

The utility model relates to the technical field of air pollution prevention and control, and discloses an SCR (Selective Catalytic Reduction) denitration reactor airflow uniform distribution device which comprises a denitration reactor main body, an air inlet is fixedly connected to the left side of the denitration reactor main body, a square frame is fixedly connected to the top end of the air inlet, an airflow uniform distribution mechanism is arranged in the air inlet, and the square frame is fixedly connected to the top end of the air inlet. A gap changing mechanism is arranged in the square frame; the gas flow uniform distribution mechanism comprises a distribution plate, the right side of the distribution plate is fixedly connected to the left side of the denitration reactor main body, a plurality of uniform distribution plates are fixedly connected to the interior of the gas inlet, and a plurality of supporting frames are fixedly connected to the exteriors of the plurality of uniform distribution plates. According to the utility model, the air flow velocities of different heights are more uniformly distributed on the cross section, and the distribution plate is used for carrying out secondary uniform distribution on the air flow subjected to primary flow equalization, so that the air flow is further refined, and a stable and uniform air flow foundation is provided for a denitration reaction.

Description

Technical Field

[0001] This utility model relates to the field of air pollution control technology, and in particular to an airflow uniform distribution device for an SCR denitrification reactor. Background Technology

[0002] SCR denitrification reactor is a key piece of equipment used in the field of industrial waste gas treatment based on selective catalytic reduction (SCR) technology. It is usually composed of a reactor shell, catalyst layer and other parts. Under certain temperature conditions, nitrogen oxides in the waste gas are chemically reacted with reducing agents such as ammonia on the catalyst surface, and converted into harmless nitrogen and water.

[0003] The role of the SCR denitrification reactor is to purify the waste gas containing a large amount of nitrogen oxides generated after combustion in the industrial production process, effectively reducing the emission concentration of nitrogen oxides to meet environmental protection standards, thereby reducing pollution to the atmospheric environment, protecting the ecological environment and human health, and helping to achieve the environmental protection goal of sustainable development.

[0004] In existing technologies, some SCR denitrification reactors have simple inlet structures and lack effective airflow uniformity measures. The velocity and direction of the dust-laden airflow entering the reactor vary significantly, resulting in extremely uneven distribution across the cross-section. In some areas, the airflow velocity is too high, causing insufficient contact time between the reactant gas and the catalyst, hindering the denitrification reaction. Conversely, in other areas, the airflow velocity is too slow, leading to gas stagnation and affecting overall reaction efficiency. This uneven airflow distribution severely restricts the denitrification effect, resulting in large amounts of nitrogen oxides being emitted into the atmosphere without adequate treatment, causing environmental pollution. Therefore, an airflow uniformity device for SCR denitrification reactors is proposed to address these problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an airflow uniform distribution device for an SCR denitrification reactor, which aims to improve the problem that some existing SCR denitrification reactors have simple air intake structures and uneven airflow distribution, resulting in low denitrification reaction efficiency and environmental pollution.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An airflow uniform distribution device for an SCR denitrification reactor includes a denitrification reactor body, an air inlet fixedly connected to the left side of the denitrification reactor body, a square frame fixedly connected to the top of the air inlet, an airflow uniform distribution mechanism inside the air inlet, and a variable gap mechanism inside the square frame.

[0008] The airflow distribution mechanism includes a distribution plate. The right side of the distribution plate is fixedly connected to the left side of the denitrification reactor body. Multiple distribution plates are fixedly connected inside the air inlet, and multiple support frames are fixedly connected to the outside of the multiple distribution plates.

[0009] As a further description of the above technical solution:

[0010] The distribution plate is located outside the air inlet. The distribution plate has a gradient design, and its size gradually increases from top to bottom along the air intake direction. The support frame is composed of steel plates and steel pipes.

[0011] As a further description of the above technical solution:

[0012] The variable gap mechanism includes a grid plate, the outer wall of which is fixedly connected to the inner wall of the square frame. A fixing plate is fixedly connected to the rear inner wall of the square frame. A transmission assembly is provided inside the fixing plate. An I-shaped slider is rotatably connected to the top of the transmission assembly. A connecting plate is fixedly connected to the top of the I-shaped slider. A top plate is fixedly connected to the top of the connecting plate. A top block is slidably connected to the bottom side of the grid plate. An adjusting plate is fixedly connected to the front side of the top block.

[0013] As a further description of the above technical solution:

[0014] The top block has an oblique sliding hole inside, and circular blocks are fixedly connected to the top left and right sides of the top plate. The outer walls of the two circular blocks are slidably connected to the inner wall of the oblique sliding hole.

[0015] As a further description of the above technical solution:

[0016] The outer wall of the adjusting plate is slidably connected to the bottom side of the grille plate, and the interior of the adjusting plate has multiple ventilation openings that match the grille plate.

[0017] As a further description of the above technical solution:

[0018] The transmission assembly includes a motor, the motor is externally fixedly connected to the inside of the fixed plate, the drive end of the motor is fixedly connected to a disc, the outside of the disc is fixedly connected to a fixed rod, the outer wall of the fixed rod is rotatably connected to a transmission plate, and the top of the transmission plate is rotatably connected to the bottom of the I-shaped slider.

[0019] As a further description of the above technical solution:

[0020] A grooved plate is fixedly connected to the inner wall of the front side of the fixed plate, the outer wall of the I-shaped slider is slidably connected to the inner wall of the grooved plate, and the outer wall of the connecting plate is slidably connected to the top inner wall of the fixed plate.

[0021] As a further description of the above technical solution:

[0022] The inner wall of the square frame is fixedly connected to multiple support rods, and the outer wall of the support rods is rotatably connected to multiple fishtail plates.

[0023] This utility model has the following beneficial effects:

[0024] 1. In this invention, under the impact of dust-laden airflow, the support frame can stably support the distribution plate, preventing it from shaking or deforming, and ensuring that the distribution plate continuously and effectively distributes the airflow. The distribution plate has a gradient design, with its size gradually increasing from top to bottom along the air intake direction. The airflow with a fast velocity at higher altitudes is slowed down by the smaller distribution plate, while the airflow with a slow velocity at lower altitudes is accelerated by the larger distribution plate, making the airflow velocity at different heights more evenly distributed across the cross-section. The distribution plate then performs a secondary distribution of the airflow after the initial equalization, further refining the airflow and providing a stable and uniform airflow foundation for the denitrification reaction.

[0025] 2. In this utility model, the grid plate and the adjusting plate in the variable gap mechanism cooperate to dynamically adjust the porosity according to the flue gas velocity using the transmission component. When the flow velocity is high, the porosity is reduced to block part of the airflow, and when the flow velocity is low, the porosity is increased to ensure smooth airflow, thereby achieving precise control of the airflow and greatly improving the uniformity of airflow distribution, allowing the airflow to contact the catalyst more evenly, thus improving the denitrification efficiency. Attached Figure Description

[0026] Figure 1 This is a perspective view of an airflow uniform distribution device for an SCR denitrification reactor proposed in this utility model;

[0027] Figure 2 This is a schematic diagram of the distribution plate of the airflow distribution device for an SCR denitrification reactor proposed in this utility model;

[0028] Figure 3 This is a schematic diagram of the square frame structure of an airflow uniform distribution device for an SCR denitrification reactor proposed in this utility model;

[0029] Figure 4 This is a schematic diagram of the structure of the grid plate of the airflow uniform distribution device for an SCR denitrification reactor proposed in this utility model;

[0030] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0031] Legend:

[0032] 1. Denitrification reactor body; 2. Distribution plate; 3. Air inlet; 4. Square frame; 5. Uniform distribution plate; 6. Support frame; 7. Grating plate; 8. Fixing plate; 9. Motor; 10. Disc; 11. Fixing rod; 12. Transmission plate; 13. I-shaped slider; 14. Grooved plate; 15. Connecting plate; 16. Top plate; 17. Circular block; 18. Top block; 19. Adjusting plate; 20. Support rod; 21. Fish tail plate. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Reference Figure 1 and Figure 2 This utility model provides an embodiment of an SCR denitrification reactor airflow uniform distribution device, including a denitrification reactor body 1. An air inlet 3 is fixedly connected to the left side of the denitrification reactor body 1. The denitrification reactor body 1 is the core load-bearing component of the entire device, providing a stable space for the denitrification reaction. It can be filled with catalysts and other reaction substances. Its left side is fixedly connected to the air inlet 3 to ensure that the incoming dust-laden airflow can smoothly enter the reactor for denitrification treatment. It is the basic structure for realizing the denitrification function and ensures that the entire denitrification process is carried out in a relatively closed and stable environment. A square frame 4 is fixedly connected to the top of the air inlet 3. An airflow uniform distribution mechanism is set inside the air inlet 3. A variable gap mechanism is set inside the square frame 4. The square frame 4 is installed at the top of the air inlet 3 to provide installation space for the variable gap mechanism.

[0035] The airflow distribution mechanism includes a distribution plate 2. The right side of the distribution plate 2 is fixedly connected to the left side of the denitrification reactor body 1. The exterior of the distribution plate 2 is located inside the air inlet 3. Multiple distribution plates 5 are fixedly connected inside the air inlet 3. The distribution plates 5 are designed with a gradient, their size gradually increasing from top to bottom along the air inlet direction. Faster airflow at higher altitudes is slowed down by the smaller distribution plates 5, while slower airflow at lower altitudes is accelerated by the larger distribution plates 5. This adjusts the airflow velocity at different heights, making the airflow distribution more uniform across the cross-section, and initially optimizing the airflow state. To alleviate pressure during subsequent processing, multiple support frames 6 are externally fixed to the multiple uniform distribution plates 5. The support frames 6 are composed of steel plates and steel pipes. Under the impact of dust-laden airflow, the support frames 6 ensure the stability of the position and shape of the uniform distribution plates 5, preventing the uniform distribution plates 5 from shaking or deforming, and ensuring that the uniform distribution plates 5 can continuously and effectively distribute the airflow, maintaining the normal operation of the device. The distribution plate 2 can perform secondary uniform distribution on the airflow after the initial uniform distribution by the uniform distribution plates 5. By changing the speed and direction of the airflow, the airflow is more evenly distributed on the cross-section of the reactor.

[0036] Reference Figure 3 , Figure 4 and Figure 5The variable gap mechanism includes a grid plate 7, the outer wall of which is fixedly connected to the inner wall of a square frame 4. A top block 18 is slidably connected to the bottom side of the grid plate 7, and an adjusting plate 19 is fixedly connected to the front side of the top block 18. The outer wall of the adjusting plate 19 is slidably connected to the bottom side of the grid plate 7. The adjusting plate 19 has multiple ventilation openings inside, which match the grid plate 7. The grid plate 7 is a key component of the variable gap mechanism. It adjusts the porosity by changing the overlapping area between the ventilation openings and its own pores. Its stable structure provides a basis for regulating airflow, allowing the airflow to be reasonably controlled according to the actual working conditions and optimizing the uniformity of airflow distribution. A fixed plate 8 is fixedly connected to the inner rear wall of the square frame 4. A transmission assembly is installed inside the fixed plate 8. An I-shaped slider 13 is rotatably connected to the top of the transmission assembly. The transmission assembly includes a motor 9, which is externally fixedly connected to the inside of the fixed plate 8. A disc 10 is fixedly connected to the drive end of the motor 9. The fixed plate 8 provides an installation position for the transmission assembly, ensuring the stability of components such as the motor 9 and the disc 10. A fixed rod 11 is fixedly connected to the outside of the disc 10. A transmission plate 12 is rotatably connected to the outer wall of the fixed rod 11. The motor 9 serves as a power source, driving the disc 10 to rotate after startup. The fixed rod 11 on the disc 10... As it rotates, it drives the transmission plate 12 to move. The top of the transmission plate 12 is rotatably connected to the bottom of the I-shaped slider 13. A grooved plate 14 is fixedly connected to the inner wall of the front side of the fixed plate 8. The outer wall of the I-shaped slider 13 is slidably connected to the inner wall of the grooved plate 14. The grooved plate 14 provides a motion track for the I-shaped slider 13, ensuring that the I-shaped slider 13 converts the rotation of the transmission plate 12 into vertical linear motion. A connecting plate 15 is fixedly connected to the top of the I-shaped slider 13. The outer wall of the connecting plate 15 is slidably connected to the top inner wall of the fixed plate 8. A top plate 16 is fixedly connected to the top of the connecting plate 15. The top block 18 has an inclined opening inside. The top plate 16 has two circular blocks 17 fixedly connected to its top left and right sides. The outer walls of the two circular blocks 17 are slidably connected to the inner walls of the oblique sliding holes. The oblique sliding holes cooperate with the circular blocks 17 of the top plate 16 to convert the vertical movement of the top plate 16 into its own horizontal movement, thereby pushing the adjusting plate 19 to slide on the bottom side of the grid plate 7 to adjust the porosity of the grid. The inner wall of the square frame 4 is fixedly connected to multiple support rods 20. The outer wall of the support rods 20 is rotatably connected to multiple fishtail plates 21. The fishtail plates 21 swing under the action of airflow, further disturbing and mixing the airflow, breaking up uneven airflow clusters, and achieving a more uniform distribution.

[0037] Working principle: The dust-laden airflow enters the SCR denitrification reactor through the square frame 4 and the air inlet 3. First, multiple uniform distribution plates 5 play an initial role in equalizing the flow. The uniform distribution plates 5 are fixed inside the air inlet 3 and are stably supported by multiple support frames 6 composed of steel plates and steel pipes. The size of the uniform distribution plates 5 gradually increases from top to bottom along the air inlet direction. When the airflow with a faster flow velocity at higher positions passes through the smaller uniform distribution plates 5, it encounters greater resistance and its velocity decreases. When the airflow with a relatively slower flow velocity at lower positions passes through the larger uniform distribution plates 5, its velocity increases. Through this differential adjustment, the airflow velocity at different height positions is more evenly distributed on the cross-section. Then, the distribution plate 2 further refines the uniform airflow, providing a stable airflow foundation for the subsequent denitrification reaction.

[0038] The motor 9 installed inside the square frame 4 starts and generates power to drive the disc 10 to rotate. The fixed rod 11 fixed on the disc 10 rotates accordingly, which in turn drives the transmission plate 12 to move. The movement of the transmission plate 12 causes the I-shaped slider 13 to reciprocate linearly within the groove plate 14, and in conjunction with the connecting plate 15, it drives the top plate 16 to move up and down. The circular block 17 at the top of the top plate 16 slides within the inclined sliding hole inside the top block 18, converting the up and down movement of the top plate 16 into the horizontal movement of the top block 18. The top block 18 pushes the adjusting plate 19 to slide on the bottom side of the grid plate 7. When the regulating plate 19 slides, the overlapping area between the vent and the pores of the grille plate 7 changes, realizing dynamic adjustment of the grille porosity. When the flue gas velocity is high, the regulating plate 19 slides to reduce the overlapping area between the vent and the pores of the grille plate 7, reducing the porosity and blocking part of the airflow. When the flow velocity is low, the overlapping area increases, increasing the porosity and ensuring smooth airflow. Thus, the porosity is automatically adjusted according to the airflow parameters to optimize the uniform distribution of airflow. It can initially guide and divert the newly entered airflow, change the initial velocity and direction of the airflow, and make the airflow initially uniform.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present 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 the present utility model should be included within the protection scope of the present utility model.

Claims

1. An SCR denitration reactor air flow uniform distribution device, comprising a denitration reactor main body (1), characterized in that: An air inlet (3) is fixedly connected to the left side of the main body (1) of the denitrification reactor. A square frame (4) is fixedly connected to the top of the air inlet (3). An airflow distribution mechanism is provided inside the air inlet (3), and a variable gap mechanism is provided inside the square frame (4). The airflow distribution mechanism includes a distribution plate (2), the right side of which is fixedly connected to the left side of the denitrification reactor body (1), and multiple distribution plates (5) are fixedly connected inside the air inlet (3), and multiple support frames (6) are fixedly connected outside the multiple distribution plates (5).

2. The SCR denitration reactor air flow uniform distribution device according to claim 1, characterized in that: The distribution plate (2) is located outside the air inlet (3). The uniform distribution plate (5) is designed with a gradient, and its size gradually increases from top to bottom along the air intake direction. The support frame (6) is composed of steel plates and steel pipes.

3. The SCR denitration reactor air flow uniform distribution device according to claim 1, characterized in that: The variable gap mechanism includes a grid plate (7), the outer wall of which is fixedly connected to the inner wall of the square frame (4), a fixing plate (8) is fixedly connected to the rear inner wall of the square frame (4), a transmission component is provided inside the fixing plate (8), an I-shaped slider (13) is rotatably connected to the top of the transmission component, a connecting plate (15) is fixedly connected to the top of the I-shaped slider (13), a top plate (16) is fixedly connected to the top of the connecting plate (15), a top block (18) is slidably connected to the bottom side of the grid plate (7), and an adjusting plate (19) is fixedly connected to the front side of the top block (18).

4. The SCR denitration reactor air flow uniform distribution device according to claim 3, characterized in that: The top block (18) has an oblique sliding hole inside, and the top plate (16) has a circular block (17) fixedly connected to the left and right sides of the top. The outer walls of the two circular blocks (17) are slidably connected to the inner wall of the oblique sliding hole.

5. The SCR denitration reactor air flow uniform distribution device according to claim 3, characterized in that: The outer wall of the adjusting plate (19) is slidably connected to the bottom side of the grille plate (7). The adjusting plate (19) has multiple ventilation openings inside, which are matched with the grille plate (7).

6. The SCR denitration reactor air flow uniform distribution device according to claim 3, characterized in that: The transmission assembly includes a motor (9), which is externally fixedly connected to the inside of the fixed plate (8). A disc (10) is fixedly connected to the drive end of the motor (9). A fixed rod (11) is fixedly connected to the outside of the disc (10). A transmission plate (12) is rotatably connected to the outer wall of the fixed rod (11). The top of the transmission plate (12) is rotatably connected to the bottom of the I-shaped slider (13).

7. The SCR denitration reactor air flow uniform distribution device according to claim 6, characterized in that: The inner wall of the front side of the fixed plate (8) is fixedly connected to a grooved plate (14), the outer wall of the I-shaped slider (13) is slidably connected to the inner wall of the grooved plate (14), and the outer wall of the connecting plate (15) is slidably connected to the top inner wall of the fixed plate (8).

8. The SCR denitration reactor air flow uniform distribution device according to claim 1, characterized in that: The inner wall of the square frame (4) is fixedly connected with multiple support rods (20), and the outer wall of the support rods (20) is rotatably connected with multiple fishtail plates (21).

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