Flue gas denitration SCR (Selective Catalytic Reduction) front filtering device

Abstract

The invention belongs to the related technical field of flue gas filtration, and particularly discloses a flue gas denitrification SCR (Selective Catalytic Reduction) front filter device which comprises a spray tower, a spray denitrification mechanism is arranged on the inner side of the spray tower, a water tank is arranged on one side of the outer part of the spray tower, a water feeding mechanism is arranged in the water tank, and a gas inlet pipe is mounted at the lower part of the inner part of the spray tower in a communicating manner; and a front blocking mechanism is arranged on the inner side of the gas inlet pipe. The gas inlet flow can be controlled at the position of the smoke front gas inlet pipe, suspended solids can be rapidly filtered out, and continuous use of the filtering structure is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field related to flue gas filtration, and specifically discloses a pre-filtering device for SCR denitrification of flue gas. Background Art

[0002] Flue gas denitrification technology refers to the technology of removing nitrogen oxides in industrial flue gas through physical, chemical or biological methods, which is mainly used in industrial fields such as coal-fired power plants, steel plants, and chemical plants; Flue gas desulfurization is divided into three major desulfurization processes: wet method, semi-dry method, and dry method. The wet desulfurization technology is relatively mature, with high efficiency and simple operation; When the flue gas enters the inside of the spray tower, it will be mixed with more suspended substances. The suspended substances will cause the spray effect to deteriorate, and more impurities will be deposited inside the tower, bringing more inconvenience to the later maintenance. Therefore, it is necessary to effectively treat the suspended substances in the pre-treatment. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems existing in the background art, and to propose a pre-filtering device for SCR denitrification of flue gas, including a spray tower. A spray denitrification mechanism is arranged inside the spray tower, a water tank is arranged on one side outside the spray tower, a water supply mechanism is arranged inside the water tank, an air inlet pipe is connected and installed below the inside of the spray tower, and a pre-blocking mechanism is arranged inside the air inlet pipe; The pre-blocking mechanism includes a support column fixedly arranged inside the air inlet pipe, and a fixed turbulence plate and a movable turbulence plate are sequentially arranged in a crossed manner outside the support column.

[0004] Preferably, the spray denitrification mechanism includes an air extraction fan installed above the inside of the spray tower, and two groups of ring frames are symmetrically arranged below the air extraction fan inside the spray tower, and spray components are arranged inside both groups of ring frames.

[0005] Preferably, the water supply mechanism includes a pump body connected and installed above the water tank. The suction pipe of the pump body extends to the bottom inside the water tank, the drain pipe of the pump body is connected and installed with a delivery pipe, and the inside of the delivery pipe and at the positions of the two groups of ring frames are connected and communicated with the spray components through corresponding connecting pipes.

[0006] Preferably, the inside of the movable turbulence plate slides on the outside of the rear end of the support column through a sliding ring arranged, the fixed turbulence plate and the movable turbulence plate are connected by a spring arranged in common, and a control component is arranged outside the sliding ring.

[0007] Preferably, a filter screen is provided inside the intake pipe and at the rear end of the movable turbulence plate. A T-shaped rod is inserted through the middle of the filter screen. Both ends of the T-shaped rod are connected to the inner wall of the intake pipe. A toothed ring is rotatably installed between the filter screen and the movable turbulence plate inside the intake pipe. One side of the inner wall of the toothed ring is connected to a U-shaped frame through a connecting rod provided. Multiple connecting shafts are rotatably installed inside the U-shaped frame. Threaded sleeves are installed outside one ends of the multiple connecting shafts, and dust sweeping platforms are installed at the ends of the threaded sleeves. Arc-shaped scraping strips are provided on the front surface of the dust sweeping platforms. The external teeth of the toothed ring are meshed with a gear. A motor is provided inside the gear. The output end of the motor is inserted inside the gear. The motor is fixedly installed outside the intake pipe. Multiple groups of filter holes are provided on the outer surface of the filter screen.

[0008] Preferably, the control assembly includes a clamping ring rotatably installed outside the slip ring. A movable arm is rotatably provided on one side of the clamping ring. A connecting rod is rotatably installed inside the end of the movable arm far from the clamping ring. The far end of the connecting rod is rotatably connected to the U-shaped frame through a connecting component provided.

[0009] Preferably, the connecting component includes a movable joint. The movable joint is rotatably connected to the connecting rod. The movable joint is fixedly provided on the outside of the U-shaped frame.

[0010] Preferably, inclined pushing rods are provided on the outside of the support column. A ball is movably clamped inside one end of the inner side of the pushing rod. The inner surface of the movable arm is in movable contact with the ball. A dust storage box is connected and installed at the front end of the filter screen and below the inner side of the intake pipe. The inside of the dust storage box is hollow, and a pull plate is slidably installed at one end inside the dust storage box.

[0011] Compared with the prior art, the present invention has the following beneficial effects: By providing a fixed turbulence plate and a movable turbulence plate inside the intake pipe and adjusting the distance between the two through the control assembly, the amount of flue gas entering at the front end can be controlled. Moreover, the fixed turbulence plate and the movable turbulence plate which are staggeredly arranged reduce the flow rate of the flue gas when it enters the intake pipe, enabling the filter screen at the rear end to completely treat the suspended matter in the flue gas. At the same time, the control assembly enables the movable turbulence plate to telescopically move in the staggered channel between the fixed turbulence plate, reducing the intensity of dust sweeping by the dust sweeping platform and the arc-shaped scraping strip, thereby prolonging the service life of the dust sweeping platform and the arc-shaped scraping strip.

[0012] The U-shaped frame provided can rotate in cooperation with the toothed ring, enabling the dust sweeping platform and the arc-shaped scraping strip inside the U-shaped frame to remove the suspended matter on the front surface of the filter screen, thereby ensuring the filtering effect of the filter screen. During the shutdown process, impurities directly discharge from the intake pipe through the inside of the dust storage box. Description of the Drawings

[0013] Figure 1Schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the connection structure of the inner part of the spray tower of the present invention; Figure 3 Schematic diagram of the connection structure of the inner part of the air inlet pipe of the present invention; Figure 4 Schematic diagram of the connection structure between the toothed ring and the U-shaped frame of the present invention; Figure 5 Schematic diagram of the connection structure between the cartridge and the ash-sweeping table of the present invention; Figure 6 Schematic diagram of the connection structure of the control component of the present invention; Figure 7 For the present invention Figure 4 Schematic diagram of the enlarged connection structure at position A in; Figure 8 For the present invention Figure 6 Schematic diagram of the enlarged connection structure at position B in.

[0014] In the figure: 1. Spray tower; 2. Water tank; 3. Delivery pipe; 4. Pump body; 5. Air inlet pipe; 6. Fixed turbulence plate; 7. Ash storage box; 8. Support column; 9. Exhaust fan; 10. Ring frame; 11. Pulling plate; 12. Toothed ring; 13. Filter screen; 14. Motor; 15. Spring; 16. U-shaped frame; 17. Filter hole; 18. Connecting shaft; 19. Cartridge; 20. Ash-sweeping table; 21. Arc scraping strip; 22. Movable turbulence plate; 23. Ball; 24. Snap ring; 25. Connecting rod; 26. Slip ring; 27. Movable arm; 28. Connecting rod; 29. Movable joint; 30. Pushing rod; 31. T-shaped rod; 32. Spray assembly; 33. Gear. Detailed implementation manners

[0015] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners.

[0016] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited by the limitations of the specific embodiments disclosed below.

[0017] As Figures 1 - 8 shown, a flue gas denitrification SCR pre-filtering device includes a spray tower 1, a spray denitrification mechanism is arranged inside the spray tower 1, a water tank 2 is arranged on one side outside the spray tower 1, a water supply mechanism is arranged inside the water tank 2, an air inlet pipe 5 is connected and installed below the inside of the spray tower 1, and a pre-blocking mechanism is arranged inside the air inlet pipe 5.

[0018] The spray de-NOx mechanism includes an air extraction fan 9 installed above the inner side of the spray tower 1. Two groups of ring frames 10 are symmetrically arranged below the air extraction fan 9 on the inner side of the spray tower 1, and spray components 32 are arranged inside both groups of ring frames 10; The air extraction fan 9 discharges the desulfurized gas from above the spray tower 1 at the upper part.

[0019] The water supply mechanism includes a pump body 4 connected and installed above the water tank 2. The suction pipe of the pump body 4 extends to the inner bottom of the water tank 2. The drain pipe of the pump body 4 is connected and installed with a delivery pipe 3. Inside the delivery pipe 3 and at the positions of the two groups of ring frames 10, they are respectively connected to the spray components 32 through corresponding connecting pipes; Under the suction of the pump body 4, the catalyst inside the water tank 2 can be sucked, and then sent into the interior of the spray component 32 through the delivery pipe 3; The spray component 32 is composed of a four-way pipe and atomizing nozzles.

[0020] The front blocking mechanism includes a support column 8 fixedly arranged inside the intake pipe 5. A fixed turbulence plate 6 and a movable turbulence plate 22 are sequentially arranged in a crossed manner outside the support column 8. The inner side of the movable turbulence plate 22 slides on the outside of the rear end of the support column 8 through a sliding ring 26 arranged. The fixed turbulence plate 6 and the movable turbulence plate 22 are connected by a common spring 15, and a control component is arranged outside the sliding ring 26; Both ends of the spring 15 are respectively connected to the outer surfaces of the fixed turbulence plate 6 and the movable turbulence plate 22. The fixed turbulence plate 6 is fixedly arranged at the front end of the support column 8, while the movable turbulence plate 22 slides flexibly at the rear end of the support column 8 through the sliding ring 26. When the control component pushes the movable turbulence plate 22, the channel size between the fixed turbulence plate 6 and the movable turbulence plate 22 is changed, slowing down the flow of the flue gas, thereby fully ensuring the effect of flue gas treatment, and at the same time intermittently reducing the burden on the filtering structure.

[0021] A filter screen 13 is arranged inside the intake pipe 5 and at the rear end of the movable turbulence plate 22. A T-shaped rod 31 is inserted through the middle of the filter screen 13, and both ends of the T-shaped rod 31 are connected to the inner wall of the intake pipe 5. A gear ring 12 is rotatably installed inside the intake pipe 5 between the filter screen 13 and the movable turbulence plate 22. One side of the inner wall of the gear ring 12 is connected with a U-shaped frame 16 through a connecting rod 28 arranged. Multiple connecting shafts 18 are rotatably installed inside the U-shaped frame 16. A clamping cylinder 19 is threadedly installed outside one end of the multiple connecting shafts 18, and a dust sweeping platform 20 is installed at the end of each clamping cylinder 19. An arc scraping strip 21 is arranged on the front surface of the dust sweeping platform 20. The external teeth of the gear ring 12 are meshed with a gear 33, a motor 14 is arranged inside the gear 33, the output end of the motor 14 is inserted through the inside of the gear 33, the motor 14 is fixedly installed outside the intake pipe 5, and multiple groups of filter holes 17 are arranged on the outer surface of the filter screen 13; The diameter of the filter holes 17 at the filter screen 13 can be selected or customized according to the filtration needs. The filter screen 13 can also be made of a polymer filter membrane to enhance the filtration effect. The motor 14 drives the gear 33 to rotate, causing the toothed ring 12 to drive the U-shaped frame 16 to rotate. The ash-sweeping table 20 can be attached to the front end of the filter screen 13, and the impurities and suspended matters blocked at the front end of the filter screen 13 are processed in a circular manner by means of the arc-shaped scraping strip 21. Due to the threaded fit between the cartridge 19 and the connecting shaft 18, during subsequent maintenance, the ash-sweeping table 20 can be easily disassembled according to the wear condition.

[0022] The control assembly includes a snap ring 24 rotatably mounted outside the slip ring 26. One side of the snap ring 24 is rotatably provided with a movable arm 27. The inner side of the end of the movable arm 27 away from the snap ring 24 is rotatably mounted with a connecting rod 25. The end of the connecting rod 25 away from the movable arm 27 is rotatably connected to the U-shaped frame 16 through a set connecting component. The connecting component includes a movable joint 29. The movable joint 29 is rotatably connected to the connecting rod 25. The movable joint 29 is fixedly arranged outside the U-shaped frame 16. An inclined actuating rod 30 is arranged outside the support column 8. The inner end of the actuating rod 30 is movably clamped with a ball 23. The inner surface of the movable arm 27 is in movable contact with the ball 23. A dust storage box 7 is connected and installed below the inner side of the air inlet pipe 5 and at the front end of the filter screen 13. The inside of the dust storage box 7 is hollow, and a pull plate 11 is slidably mounted at one end inside the dust storage box 7. After the actuating rod 30 and the ball 23 are contacted by the movable arm 27, it will cause the movable arm 27 to expand towards one end. Thus, the connecting rod 25 rotates towards one end, pushing the slip ring 26 to move. The swept suspended matters and impurities can fall into the dust storage box 7 by their own gravity. Pull out the pull plate 11 to discharge the ash.

[0023] Working principle: During use, the air inlet pipe 5 is connected to an external flue gas discharge pipe. When the flue gas enters the air inlet pipe 5, it will enter the filter screen 13 through the channel between the fixed turbulence plate 6 and the movable turbulence plate 22. The fixed turbulence plate 6 and the movable turbulence plate 22 can reduce the flow rate of the flue gas when it enters, making the originally straight pipe increase the bending channels. The cross-sectional area of the flue gas channel decreases, the flow rate decreases, the residence time of the flue gas in front of the filter screen 13 is extended, and the interception efficiency of the suspended matters is improved. To ensure the use effect of the filter screen 13, the motor 14 drives the gear 33 to rotate, causing the toothed ring 12 to drive the U-shaped frame 16 to rotate synchronously. The multiple ash-sweeping tables 20 inside the U-shaped frame 16 can be attached to the surface of the filter screen 13 through the arc-shaped scraping strips 21 arranged at the ends to scrape off the suspended matters. The impurities swept down settle into the dust storage box 7 due to gravity, so as to ensure the continuous filtration effect of the filter screen 13 and also reduce the load on the filter screen 13. And when the U-shaped frame 16 rotates, the movable joint 29 on the inner wall of the gear ring 12 will drive the connecting rod 25, the movable arm 27, and the clamping ring 24 to rotate outside the slip ring 26. When the movable arm 27 rotates to the abutting rod 30, the inner wall will contact the ball 23. Since the abutting rod 30 is inclined and extends to one side, the movable arm 27 rotates outward relative to the clamping ring 24. When the connecting rod 25 moves with the movable arm 27, it adaptively extends outward, pushing the slip ring 26 forward, thereby changing the position of the movable turbulence plate 22. At this time, the channel between the movable turbulence plate 22 and the fixed turbulence plate 6 becomes shorter during the forward movement of the movable turbulence plate 22, which causes the flue gas flow rate to slow down. As a result, more flue gas entering the intake pipe 5 can be fully blocked by the filter screen 13. The pre-filtering structure can reduce the sedimentation amount of suspended substances in the spray tower 1 and reduce the loss of denitration catalysts.

[0024] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A flue gas denitrification SCR pre-filter device, comprising a spray tower (1). A spray denitrification mechanism is arranged inside the spray tower (1). A water tank (2) is arranged on one side outside the spray tower (1). A water supply mechanism is arranged inside the water tank (2). An air inlet pipe (5) is connected and installed below the inside of the spray tower (1). A pre-blocking mechanism is arranged inside the air inlet pipe (5). The pre-blocking mechanism includes a support column (8) fixedly arranged inside the air inlet pipe (5). A fixed turbulence plate (6) and a movable turbulence plate (22) are sequentially arranged in a crossed manner outside the support column (8).

2. The SCR pre-filter device for flue gas denitrification according to claim 1, characterized in that: The spray denitrification mechanism includes an air extraction fan (9) installed above the inside of the spray tower (1). Two groups of ring frames (10) are symmetrically arranged below the air extraction fan (9) inside the spray tower (1). Spray assemblies (32) are arranged inside the two groups of ring frames (10).

3. The SCR pre-filter device for flue gas denitration according to claim 1, wherein: The water supply mechanism includes a pump body (4) connected and installed above the water tank (2). The suction pipe of the pump body (4) extends to the inner bottom of the water tank (2). The drain pipe of the pump body (4) is connected and installed with a delivery pipe (3). The inside of the delivery pipe (3) at the positions of the two groups of ring frames (10) is connected to the spray assemblies (32) through corresponding connecting pipes.

4. A flue gas denitration SCR pre-filter device according to claim 1, characterized in that: The inside of the movable turbulence plate (22) slides outside the rear end of the support column (8) through a sliding ring (26) arranged. The fixed turbulence plate (6) and the movable turbulence plate (22) are connected through a spring (15) arranged in common. A control component is arranged outside the sliding ring (26).

5. The SCR pre-filter device for flue gas denitration according to claim 4, characterized in that: A filter screen (13) is arranged inside the air inlet pipe (5) at the rear end of the movable turbulence plate (22). A T-shaped rod (31) is inserted in the middle of the filter screen (13). Both ends of the T-shaped rod (31) are connected to the inner wall of the air inlet pipe (5). A toothed ring (12) is rotatably installed inside the air inlet pipe (5) between the filter screen (13) and the movable turbulence plate (22). One side of the inner wall of the toothed ring (12) is connected with a U-shaped frame (16) through a connecting rod (28) arranged. Multiple connecting shafts (18) are rotatably installed inside the U-shaped frame (16). Threaded sleeves (19) are installed outside one end of the multiple connecting shafts (18). Sweeping platforms (20) are installed at the ends of the threaded sleeves (19). Arc scraping strips (21) are arranged on the front surface of the sweeping platforms (20). The external teeth of the toothed ring (12) are meshed and connected with a gear (33). A motor (14) is arranged inside the gear (33). The output end of the motor (14) is inserted inside the gear (33). The motor (14) is fixedly installed outside the air inlet pipe (5). Multiple groups of filter holes (17) are arranged on the outer surface of the filter screen (13).

6. The SCR pre-filter device for flue gas denitration according to claim 4, wherein: The control component includes a snap ring (24) rotatably installed outside the slip ring (26). One side of the snap ring (24) is rotatably provided with a movable arm (27). The inner side of the end of the movable arm (27) away from the snap ring (24) is rotatably installed with a connecting rod (25). The end of the connecting rod (25) away from the movable arm (27) is rotatably connected to the U-shaped frame (16) through a provided connecting component.

7. The SCR pre-filter device for flue gas denitration according to claim 6, wherein: The connecting component includes a movable joint (29). The movable joint (29) is rotatably connected to the connecting rod (25), and the movable joint (29) is fixedly arranged on the outer side of the U-shaped frame (16).

8. A SCR pre-filter device for flue gas denitration according to claim 6, characterized in that: An inclined actuating rod (30) is arranged outside the support column (8). The inner end of the actuating rod (30) is movably clamped with a ball (23). The inner surface of the movable arm (27) is movably fitted with the ball (23). A dust storage box (7) is connected and installed below the inner side of the air inlet pipe (5) and at the front end of the filter screen (13). The inside of the dust storage box (7) is hollow, and a pull plate (11) is slidably installed at one end inside the dust storage box (7).

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