Power plant boiler tail flue gas dust removal and denitration treatment device and method

Abstract

The application discloses a kind of power plant boiler tail flue gas dust removal and denitration processing device and method in the technical field of flue gas treatment, including denitration box and dust removal box, and the gas pipe is fixedly connected on the denitration box, and the other end of the gas pipe is fixedly connected with the dust removal box, and a plurality of dust removal cloth bags are arranged in the dust removal box, and the plurality of dust removal cloth bags are distributed in the dust removal box in the form of circumferential array;Cleaning mechanism is arranged in the dust removal box, and the cleaning mechanism is used to automatically clean the dust adhered on all cloth bags;Replacement mechanism is arranged on the dust removal box, and the replacement mechanism is used to replace the blocked dust removal cloth bag without affecting the dust removal of other dust removal cloth bags after one of the dust removal cloth bags is completely blocked;The device can automatically clean the dust on the dust removal cloth bag, and can automatically replace the dust removal cloth bag without affecting the dust removal of other dust removal cloth bags.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment technology, specifically to a device and method for dust removal and denitrification treatment of flue gas at the tail end of a power plant boiler. Background Technology

[0002] Power plant boilers are one of the main thermal power equipment in thermal power plants. They are usually matched with steam turbine generator sets of a certain capacity and are mainly used for power generation, but in some special cases they can also be used for external heating. The flue gas produced by boiler combustion contains a large amount of nitrogen oxides and dust, so the flue gas must be denitrified and dust removed before it can be discharged.

[0003] Existing equipment removes dust from flue gas after denitrification by using filter bags. Current dust collection equipment fixes multiple filter bags inside a dust collection box, then introduces the flue gas into the box. The flue gas is then discharged after being filtered through the filter bags, but dust in the flue gas adheres to the filter bags, continuously reducing their filtration efficiency. Current methods typically involve periodically injecting high-pressure gas into the filter bags to shake off the dust. However, because the high-pressure gas is injected periodically while the dust on the filter bags continues to accumulate, the filtration efficiency of the filter bags continuously decreases after each high-pressure gas injection until the next injection. Furthermore, when the filter bags become completely clogged after prolonged use, they need to be replaced. Replacing these bags requires stopping the supply of flue gas to the dust collection box, further reducing the flue gas removal efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for dust removal and denitrification treatment of flue gas at the tail end of a power plant boiler, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a device and method for dust removal and denitrification treatment of flue gas at the tail end of a power plant boiler, comprising a denitrification box and a dust collection box, wherein an air pipe is fixedly connected to the denitrification box, and the other end of the air pipe is fixedly connected to the dust collection box; the dust collection box contains a plurality of dust collection bags arranged in a circumferential array within the dust collection box; the dust collection box contains a cleaning mechanism for automatically cleaning the dust adhering to all the bags; the dust collection box contains a replacement mechanism for replacing a clogged dust collection bag when one of the dust collection bags is completely clogged, without affecting the dust removal of other dust collection bags.

[0006] The cleaning mechanism includes a fixed rod, which is fixedly connected to a dust collector box. A fixed frame is fixedly connected to the upper end of the fixed rod, and a first motor is fixedly connected to the fixed frame. A turntable is fixedly connected to the bottom end of the output shaft of the first motor, and the turntable is rotatably connected to the dust collector box. Multiple mounting blocks are rotatably connected to the turntable, and the number of mounting blocks is equal to the number of dust collector bags. A docking block is fixedly connected to each dust collector bag, and the docking block engages with the mounting block. The turntable is provided with a locking mechanism, which is used to lock the dust collector bags located in the mounting blocks onto the turntable. The dust collector box is provided with a first rotating mechanism, which is used to drive each mounting block to rotate relative to the turntable when the turntable rotates. Multiple brushes are fixedly connected to the inner wall of the dust collector box, and the brushes are in contact with the dust collector bags.

[0007] The engaging mechanism includes multiple fixed seats, the number of which is equal to the number of mounting blocks; the multiple fixed seats and multiple mounting blocks are alternately distributed on the turntable, and the fixed seats are fixedly connected to the turntable; each fixed seat has a pressing block rotatably connected near two mounting blocks, and the pressing block is driven to rotate by the fixed seat when energized; the pressing block has a ball bearing engaged, and the ball bearing fits against the mating block.

[0008] The first rotating mechanism includes a fixed cylinder, which is sleeved on the connecting shaft between the turntable and the motor. The upper end of the fixed cylinder is fixedly connected to the fixed frame, and the bottom end of the fixed cylinder is fixedly connected to a first gear. The first gear and the fixed cylinder are both clearance-fitted with the connecting shaft between the turntable and the motor. The mounting blocks are provided with teeth, and the first gear meshes with all the mounting blocks simultaneously.

[0009] The replacement mechanism includes a rotating frame sleeved on a fixed rod; wind sensors are symmetrically fixedly connected to both ends of the rotating frame, and clamps are fixedly connected to the wind sensors; a dust collector bag to be installed is fixedly connected to the clamp at the front end of the rotating frame; a sealing mechanism is provided on the dust collector box at the bottom of the fixed rod, which is used to seal the space inside the dust collector box that needs to be replaced when replacing the dust collector bag; a driving mechanism is provided on the dust collector box, which is used to drive the rotating frame to remove the dust collector bag to be replaced and install the dust collector bag to be installed, while simultaneously driving the sealing mechanism to operate.

[0010] The sealing mechanism includes two symmetrically arranged arc-shaped sealing plates, both of which are slidably connected to the dust collector. A sealing plate is fixedly connected to the inner wall of the dust collector at the bottom of the two arc-shaped sealing plates, and a lower sealing groove is formed on the sealing plate. An upper sealing groove is formed on both sides of the bottom surface of the turntable at each mounting block. The upper and lower ends of the arc-shaped sealing plates are slidably connected to the upper and lower sealing grooves, respectively. A connecting rod is fixedly connected to the upper end of the left arc-shaped sealing plate and the bottom end of the right arc-shaped sealing plate. A rotating rod is fixedly connected to the right end of the left connecting rod and the left end of the right connecting rod. The rotating rod is rotatably connected to the dust collector, and a first bevel gear is fixedly connected to the upper end of the rotating rod. A second bevel gear meshes with the first bevel gear, and the second bevel gear is rotatably connected to the dust collector, with a second gear fixedly connected to the second bevel gear.

[0011] The driving mechanism includes a cylinder, the upper part of which is fixedly connected to a fixed frame and the lower part of which is fixedly connected to an annular frame. The annular frame is sleeved on the dust collector and slidably connected to the dust collector. Racks are symmetrically fixedly connected to the left and right ends of the annular frame, and the two racks mesh with two second gears respectively. A first push rod is fixedly connected to the bottom of the teeth of the rack. A second push rod is sleeved on the fixed rod at the bottom of the rotating frame, and the first push rods on both the left and right sides are located directly below the second push rod. A second rotating mechanism is provided on the rotating frame, which is used to drive the rotating frame to rotate 180 degrees when the rotating frame moves to the uppermost position.

[0012] The second rotating mechanism includes a sliding block, which is sleeved on and slidably connected to a fixed rod; the sliding block is rotatably connected to a rotating frame, and a ratchet is fixedly connected above the sliding block, with the ratchet and fixed rod having a clearance fit; pawls are fixedly connected to both sides of the ratchet on the rotating frame, and both pawls engage with the ratchet; two helical rods are fixedly connected to the rotating frame, arranged in a circumferential array, and the projection of the helical rods on the rotating frame from top to bottom is a semi-circular shape; connecting frames are symmetrically fixedly connected to the front and rear sides of the upper end of the fixed rod, and a rotating block is rotatably connected to the inner side of the connecting frame; a torsion spring is sleeved on the rotating block at the connection point with the connecting frame, with one end of the torsion spring fixedly connected to the rotating block and the other end fixedly connected to the connecting frame; a stop block is fixedly connected to the connecting frame above the rotating block, and the stop block is in contact with the upper part of the rotating block.

[0013] A dust discharge box is fixedly connected to the bottom side of the dust collection box. The inner cavity of the dust discharge box is cylindrical. A dust discharge plate is provided inside the dust discharge box, and the dust discharge plate is sealed and fitted to the inner wall of the dust discharge box. The dust discharge plate has six dust discharge chambers, and the dust discharge chambers on the upper and lower sides of the dust discharge plate are connected to the upper and lower interfaces of the dust discharge box. A second motor is fixedly connected to the dust discharge box, and the output shaft of the second motor is fixedly connected to the dust discharge plate.

[0014] A method for dust removal and denitrification treatment of flue gas at the tail end of a power plant boiler, the specific steps of which are as follows:

[0015] Step 1: The flue gas is introduced into the denitrification box. After the flue gas passes through the denitrification box, it enters the dust collection box through the gas pipe.

[0016] Step 2: After the flue gas in the dust collector passes through the dust collector bags, the dust is filtered and adheres to the dust collector bags;

[0017] Step 3: Activate the cleaning mechanism to clean the dust adhering to the dust collector bag;

[0018] Step 4: After the dust collector bag is blocked, start the replacement mechanism. The replacement mechanism will replace the blocked dust collector bag with a new dust collector bag without affecting the dust collection of other dust collector bags.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] This invention utilizes a dust collector bag to filter out dust from flue gas. Dust contained in the flue gas is filtered out and adheres to the dust collector bag. At this time, a cleaning mechanism is activated to continuously remove the dust adhering to the dust collector bag. This effectively improves the dust removal efficiency of the dust collector bag, reduces the likelihood of clogging, and extends the service life of the dust collector bag.

[0021] This invention allows for the automatic replacement of clogged dust collector bags after prolonged periods of dust accumulation, without affecting the dust collection of other dust collector bags. This effectively ensures the dust collection performance of the device and improves the efficiency of flue gas dust removal. Attached Figure Description

[0022] Figure 1 This is a flowchart of the method of the present invention;

[0023] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the rear view structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the dust collection box in this invention;

[0026] Figure 5 This is a schematic diagram of the disassembled structure of the dust collection box in this invention;

[0027] Figure 6 This is a schematic diagram of the replacement mechanism in this invention;

[0028] Figure 7 This is a schematic diagram of the ring frame structure in this invention;

[0029] Figure 8 This is a schematic diagram of the structure of the first gear in this invention;

[0030] Figure 9 for Figure 8 A magnified structural diagram of A in the middle;

[0031] Figure 10 This is a schematic diagram of the cleaning mechanism in this invention;

[0032] Figure 11 for Figure 10 A magnified structural diagram of B in the diagram;

[0033] Figure 12 This is a schematic diagram of the gripper disc in the present invention;

[0034] Figure 13 This is a cross-sectional view of the dust collection box in this invention.

[0035] The attached diagram lists the components represented by each number as follows:

[0036] 1. Denitrification box; 2. Dust collection box; 3. Air pipe; 4. Dust collector bag; 5. Fixing rod; 6. Fixing frame; 7. First motor; 8. Turntable; 9. Mounting block; 10. Connecting block; 11. Brush; 12. Fixing seat; 13. Pressing block; 15. Fixing cylinder; 16. First gear; 17. Rotating frame; 18. Wind sensor; 19. Clamp; 20. Arc-shaped sealing plate; 21. Sealing plate; 22. Lower sealing groove; 23. Upper sealing groove ; 24. Connecting rod; 25. Rotating rod; 26. First bevel gear; 27. Second bevel gear; 28. Second gear; 29. ​​Cylinder; 30. Ring frame; 31. Rack; 32. First push rod; 33. Second push rod; 34. Sliding block; 35. Ratchet; 36. Pawl; 37. Helical rod; 38. Connecting frame; 39. Rotating block; 40. Torsion spring; 41. Stop block; 42. Ash discharge box; 43. Ash discharge plate; 44. Second motor. Detailed Implementation

[0037] Please see Figure 1-13This invention provides a technical solution: a device and method for dust removal and denitrification treatment of flue gas at the tail end of a power plant boiler, comprising a denitrification box 1 and a dust removal box 2. A gas pipe 3 is fixedly connected to the denitrification box 1, and the other end of the gas pipe 3 is fixedly connected to the dust removal box 2. Multiple dust removal bags 4 are arranged in a circumferential array within the dust removal box 2. A cleaning mechanism is provided within the dust removal box 2 to automatically remove dust from all the bags. A replacement mechanism is provided on the dust removal box 2 to replace a clogged dust removal bag 4 without affecting the dust removal function of other dust removal bags 4 after the bag 4 becomes completely clogged.

[0038] like Figure 2-3 As shown, during operation, when denitrification and dust removal of flue gas are required, the flue gas is first introduced into the denitrification chamber 1. The denitrification of the flue gas is completed through the denitrification chamber 1. After denitrification, the flue gas enters the dust collection chamber 2 along the gas pipe 3. The flue gas entering the dust collection chamber 2 is discharged into the air through the dust collector bags 4. When the flue gas passes through the dust collector bags 4, the dust contained in the flue gas is filtered down by the dust collector bags 4 and adheres to the dust collector bags 4. At this time, the cleaning mechanism is activated, and the cleaning mechanism can continuously clean the flue gas. The dust adhering to the dust collector bag 4 is cleaned away, thereby effectively improving the dust removal effect of the dust collector bag 4, reducing the degree of clogging of the dust collector bag 4, and extending the service life of the dust collector bag 4. When the dust collector bag 4 is completely clogged by dust for a long time, the replacement mechanism is activated. The replacement mechanism can automatically replace the clogged dust collector bag 4 without affecting the dust removal of other dust collector bags 4, which can effectively ensure the dust removal effect of the device and improve the efficiency of flue gas dust removal.

[0039] like Figure 4-5 , Figure 8 , Figure 10-11 As shown, as a further embodiment of the present invention, the cleaning mechanism includes a fixed rod 5, which is fixedly connected to the dust collection box 2. A fixed frame 6 is fixedly connected to the upper end of the fixed rod 5, and a first motor 7 is fixedly connected to the fixed frame 6. A turntable 8 is fixedly connected to the bottom end of the output shaft of the first motor 7, and the turntable 8 is rotatably connected to the dust collection box 2. A plurality of mounting blocks 9 are rotatably connected to the turntable 8, and the number of mounting blocks 9 is equal to the number of dust collection bags 4. A docking block 10 is fixedly connected to the dust collection bag 4, and the docking block 10 is engaged with the mounting block 9. A locking mechanism is provided on the turntable 8, which is used to lock the dust collection bag 4 located in the mounting block 9 onto the turntable 8. A first rotating mechanism is provided on the dust collection box 2, which is used to drive each mounting block 9 to rotate relative to the turntable 8 when the turntable 8 rotates. A plurality of brushes 11 are fixedly connected to the inner wall of the dust collection box 2, and the brushes 11 are in contact with the dust collection bag 4.

[0040] The engaging mechanism includes multiple fixed seats 12, the number of which is equal to the number of mounting blocks 9; the multiple fixed seats 12 and multiple mounting blocks 9 are alternately distributed on the turntable 8, and the fixed seats 12 are fixedly connected to the turntable 8; pressing blocks 13 are rotatably connected to each fixed seat 12 near two mounting blocks 9, and the pressing blocks 13 are driven to rotate by the fixed seats 12 when powered; the pressing blocks 13 are engaged with ball bearings, and the ball bearings are in contact with the mating block 10;

[0041] The first rotating mechanism includes a fixed cylinder 15, which is sleeved on the connecting shaft between the turntable 8 and the motor. The upper end of the fixed cylinder 15 is fixedly connected to the fixed frame 6, and the bottom end of the fixed cylinder 15 is fixedly connected to a first gear 16. Both the first gear 16 and the fixed cylinder 15 are clearance-fitted with the connecting shaft between the turntable 8 and the motor. The mounting blocks 9 are provided with teeth, and the first gear 16 meshes with all the mounting blocks 9 at the same time.

[0042] During operation, when it is necessary to clean the dust adhering to the dust collector bag 4, the first motor 7 is started. The first motor 7 will drive the turntable 8 to rotate, and the turntable 8 will rotate along with the mounting block 9 on its surface. The mounting block 9 drives the dust collector bag 4 connected to the docking block 10 to rotate along with the turntable 8 through the docking block 10. At this time, as all the dust collector bags 4 rotate with the turntable 8, when the dust collector bags 4 pass by the brush 11, the dust on their surface will be brushed off by the brush 11.

[0043] When the turntable 8 drives all the mounting blocks 9 on its surface to rotate, since the mounting blocks 9 mesh with the first gear 16 and the first gear 16 remains stationary, when the turntable 8 drives the mounting blocks 9 to rotate around the first gear 16, the mounting blocks 9 will rotate relative to the turntable 8. The mounting blocks 9 drive the dust collector bag 4 to rotate relative to the turntable 8 through the docking block 10, so that the brush 11 can brush off all the dust on the dust collector bag 4.

[0044] like Figure 6-9 , Figure 12-13 As shown, as a further embodiment of the present invention, the replacement mechanism includes a rotating frame 17, which is sleeved on the fixed rod 5; wind sensors 18 are symmetrically fixedly connected to the front and rear ends of the rotating frame 17, and clamps 19 are fixedly connected to the wind sensors 18; a dust collector bag 4 to be installed is fixedly connected to the clamp 19 at the front end of the rotating frame 17; a sealing mechanism is provided on the dust collector box 2 at the bottom of the fixed rod 5, which is used to seal the space inside the dust collector box 2 that needs to be replaced when replacing the dust collector bag 4; a driving mechanism is provided on the dust collector box 2, which is used to drive the rotating frame 17 to remove the dust collector bag 4 to be replaced and install the dust collector bag 4 to be installed, and at the same time drive the sealing mechanism to run;

[0045] The sealing mechanism includes two symmetrically arranged arc-shaped sealing plates 20, both of which are slidably connected to the dust collector 2. A sealing plate 21 is fixedly connected to the inner wall of the dust collector 2 at the bottom of the two arc-shaped sealing plates 20, and a lower sealing groove 22 is provided on the sealing plate 21. An upper sealing groove 23 is provided on the bottom surface of the turntable 8 at both sides of each mounting block 9. The upper and lower ends of the arc-shaped sealing plates 20 are slidably connected to the upper sealing groove 23 and the lower sealing groove 22, respectively. A connecting rod 24 is fixedly connected to the upper end of the left arc-shaped sealing plate 20 and the bottom end of the right arc-shaped sealing plate 20. A rotating rod 25 is fixedly connected to the right end of the left connecting rod 24 and the left end of the right connecting rod 24. The rotating rod 25 is rotatably connected to the dust collector 2, and a first bevel gear 26 is fixedly connected to the upper end of the rotating rod 25. A second bevel gear 27 meshes with the first bevel gear 26. The second bevel gear 27 is rotatably connected to the dust collector 2, and a second gear 28 is fixedly connected to the second bevel gear 27.

[0046] The drive mechanism includes a cylinder 29, the upper part of which is fixedly connected to the fixed frame 6 and the lower part of which is fixedly connected to an annular frame 30. The annular frame 30 is sleeved on the dust collector 2 and is slidably connected to the dust collector 2. Racks 31 are symmetrically fixedly connected to the left and right ends of the annular frame 30, and the two racks 31 mesh with two second gears 28 respectively. A first push rod 32 is fixedly connected to the bottom of the teeth of the rack 31. A second push rod 33 is sleeved on the fixed rod 5 at the bottom of the rotating frame 17, and the first push rods 32 on both the left and right sides are located directly below the second push rod 33. A second rotating mechanism is provided on the rotating frame 17, which is used to drive the rotating frame 17 to rotate 180 degrees when the rotating frame 17 moves to the uppermost position.

[0047] The second rotating mechanism includes a sliding block 34, which is sleeved on and slidably connected to the fixed rod 5; the sliding block 34 is rotatably connected to the rotating frame 17, and a ratchet 35 is fixedly connected above the sliding block 34, with the ratchet 35 in clearance fit with the fixed rod 5; pawls 36 are fixedly connected to both sides of the ratchet 35 on the rotating frame 17, and both pawls 36 engage with the ratchet 35; two helical rods 37 are fixedly connected to the rotating frame 17, and the two helical rods 37 are arranged in a circumferential array on the rotating frame 17. The projection of the spiral rod 37 onto the rotating frame 17 from top to bottom is a semi-circular shape; the connecting frame 38 is symmetrically fixed to the front and rear sides of the upper end of the fixed rod 5, and the rotating block 39 is rotatably connected to the inner side of the connecting frame 38. A torsion spring 40 is sleeved on the rotating block 39 at the connection point with the connecting frame 38. One end of the torsion spring 40 is fixedly connected to the rotating block 39 and the other end is fixedly connected to the connecting frame 38; a stop block 41 is fixedly connected to the connecting frame 38 above the rotating block 39, and the stop block 41 fits against the upper part of the rotating block 39.

[0048] During operation, the turntable 8 rotates, causing each dust collector bag 4 to pass through the wind sensor 18 located at the rear of the rotating frame 17. When the dust collector bag 4 is not blocked, the air in the dust collector box 2 will pass through the dust collector bag 4 and be discharged through the docking block 10. At this time, when the dust collector bag 4 passes through the wind sensor 18, the wind sensor 18 will detect that the dust collector bag 4 can work normally. When the dust collector bag 4 is blocked, the wind sensor 18 will not detect any wind. At this time, the wind sensor 18 will drive the clamp 19 connected to it to clamp the docking block 10 corresponding to the dust collector bag 4. At the same time, it will start the two pressing blocks 13 pressing the docking block 10 to rotate upward. After the pressing blocks 13 rotate upward by 90 degrees, the docking block 10 can be separated from the mounting block 9 normally.

[0049] At this time, cylinder 29 is activated, which drives the ring frame 30 to move upward. The ring frame 30 drives the two racks 31 connected to it to move upward, and the racks 31 drive the first push rod 32 to move upward. When the racks 31 start to move upward, they will drive the second gear 28 meshing with them to start rotating. When the second gear 28 rotates, it drives the second bevel gear 27 to rotate. The second bevel gear 27 drives the first bevel gear 26 to rotate, and the first bevel gear 26 drives the rotating rod 25 connected to it to rotate. The rotating rod 25 will drive the arc through the connecting rod. The arc-shaped sealing plate 20 rotates along the rotating rod 25 inside the dust collector box 2. When the arc-shaped sealing plate 20 rotates into the dust collector box 2, the upper and lower ends of the arc-shaped sealing plate 20 will slide into the upper sealing groove 23 and the lower sealing groove 22 respectively, thereby further improving the sealing performance of the arc-shaped sealing plate 20. When the arc-shaped sealing plates 20 on the left and right sides move to the position where they fit together, the dust collector bag 4 is isolated from the space inside the dust collector box 2, and at the same time, the rack 31 moves to the position above the second gear 28 and disengages from the second gear 28.

[0050] At the same time, the first push rod 32 on the rack 31 just begins to engage with the second push rod 33. As the cylinder 29 drives the ring frame 30 to move upward, the first push rod 32 will push the second push rod 33 to move upward. The second push rod 33 will drive the sliding block 34 to slide upward, and the sliding block 34 will drive the rotating frame 17 to move upward.

[0051] When the screw rod 37 on the rotating frame 17 moves upward to the position where it contacts the rotating block 39, the screw rod 37 continues to move upward as driven by the rotating frame 17. Under the action of the rotating block 39, the screw rod 37 will drive the rotating frame 17 to start rotating. When the rotating frame 17 moves to the uppermost position, the rotating frame 17 has rotated exactly 180 degrees. At this time, the rotating frame 17 swaps the positions of the new dust collector bag 4 and the clogged dust collector bag 4. Then, the cylinder 29 is activated to drive the annular frame 30 to move downward. When the annular frame 30 moves downward, the rotating frame 17 and the sliding block 34 will follow the annular frame 30 downward. The rotating frame 17 will not rotate in the opposite direction under the action of the ratchet 35 and the pawl 36. Therefore, when the screw rod 37 moves downward and contacts the rotating block 39, it will drive the rotating block 39 to rotate downward. When the rotating frame 17 moves downwards to the position where it disengages from the rotating block 39, the rotating block 39 is directly reset under the action of the torsion spring 40. When the rotating frame 17 moves the new dust collector bag 4 downwards to the bottom position, the new dust collector bag 4 is completely moved into the dust collector box 2. The docking block 10 connected to the dust collector bag 4 docks with the mounting block 9. Then, the pressing blocks 13 on both sides of the docking block 10 are started to rotate downwards to the position where they fit with the docking block 10, so that the docking block 10 and the mounting block 9 fit tightly together. As the ring frame 30 continues to move downwards, the rack 31 will drive the second gear 28 to start rotating in the opposite direction, and the arc-shaped sealing plate 20 will slowly open. When the ring frame 30 moves to the bottom position, the two arc-shaped sealing plates 20 are fully opened, and the first motor 7 can be started to drive the turntable 8 to rotate normally.

[0052] like Figure 13 As shown, as a further embodiment of the present invention, a dust discharge box 42 is fixedly connected to the bottom side of the dust collection box 2. The inner cavity of the dust discharge box 42 is cylindrical. A dust discharge plate 43 is provided inside the dust discharge box 42, and the dust discharge plate 43 is sealed and fitted to the inner wall of the dust discharge box 42. The dust discharge plate 43 has six dust discharge chambers, and the dust discharge chambers on the upper and lower sides of the dust discharge plate are connected to the upper and lower interfaces of the dust discharge box. A second motor 44 is fixedly connected to the dust discharge box 42, and the output shaft of the second motor 44 is fixedly connected to the dust discharge plate 43.

[0053] During operation, when the dust collector bag 4 comes into contact with the brush 11, the dust on it will be brushed off by the brush 11. The fallen dust will fall directly into the ash discharge box 42. At this time, the second motor 44 is started, and the second motor 44 drives the ash discharge plate 43 to rotate. The ash discharge plate 43 will discharge the dust in the ash discharge box 42 in batches. Since the four ash discharge chambers of the ash discharge plate 43 are in contact with the inner wall of the ash discharge box 42 at the same time, the ash discharge plate 43 can seal the ash discharge box 42.

[0054] like Figure 1 As shown, as a further aspect of the present invention, a method for dust removal and denitrification of flue gas at the tail end of a power plant boiler includes the following specific steps:

[0055] Step 1: The flue gas is introduced into the denitrification box. After the flue gas passes through the denitrification box 1, it enters the dust collection box 2 through the gas pipe 3.

[0056] Step 2: After the flue gas in the dust collector 2 passes through the dust collector bag 4, the dust is filtered and adheres to the dust collector bag 4;

[0057] Step 3: Activate the cleaning mechanism to clean the dust adhering to the dust collector bag 4;

[0058] Step 4: After the dust collector bag 4 is blocked, start the replacement mechanism. The replacement mechanism will replace the blocked dust collector bag 4 with a new dust collector bag 4 without affecting the dust collection of other dust collector bags 4.

Claims

1. A dust removal and denitrification treatment device for flue gas at the tail end of a power plant boiler, comprising a denitrification box (1) and a dust removal box (2), characterized in that: A gas pipe (3) is fixedly connected to the denitrification box (1), and the other end of the gas pipe (3) is fixedly connected to the dust collection box (2). The dust collection box (2) is provided with multiple dust collection bags (4), which are arranged in a circular array inside the dust collection box (2). The dust collection box (2) is provided with a cleaning mechanism, which is used to automatically clean the dust adhering to all the bags. The dust collection box (2) is provided with a replacement mechanism, which is used to replace the blocked dust collection bag (4) after one of the dust collection bags (4) is completely blocked, without affecting the dust collection of other dust collection bags (4). The cleaning mechanism includes a fixed rod (5), which is fixedly connected to the dust collection box (2). A fixed frame (6) is fixedly connected to the upper end of the fixed rod (5). A first motor (7) is fixedly connected to the fixed frame (6). A turntable (8) is fixedly connected to the bottom end of the output shaft of the first motor (7). The turntable (8) is rotatably connected to the dust collection box (2). Multiple mounting blocks (9) are rotatably connected to the turntable (8). The number of mounting blocks (9) is equal to the number of dust collection bags (4). A docking block is fixedly connected to the dust collection bag (4). 10) The docking block (10) is engaged with the mounting block (9); the turntable (8) is provided with a locking mechanism, which is used to lock the dust collector bag (4) located in the mounting block (9) onto the turntable (8); the dust collector box (2) is provided with a first rotating mechanism, which is used to drive each mounting block (9) to rotate relative to the turntable (8) when the turntable (8) rotates; a plurality of brushes (11) are fixedly connected to the inner wall of the dust collector box (2), and the brushes (11) are in contact with the dust collector bag (4); The replacement mechanism includes a rotating frame (17) which is sleeved on a fixed rod (5); wind sensors (18) are symmetrically fixed at both ends of the rotating frame (17), and clamps (19) are fixedly connected to the wind sensors (18); a dust collector bag (4) to be installed is fixedly connected to the clamp (19) at the front end of the rotating frame (17); a sealing mechanism is provided on the dust collector box (2) at the bottom of the fixed rod (5), which is used to seal the space inside the dust collector box (2) to be replaced when replacing the dust collector bag (4); a driving mechanism is provided on the dust collector box (2), which is used to drive the rotating frame (17) to remove the dust collector bag (4) to be replaced and install the dust collector bag (4) to be installed, while simultaneously driving the sealing mechanism to run.

2. The dust removal and denitrification treatment device for flue gas at the tail end of a power plant boiler according to claim 1, characterized in that: The engaging mechanism includes multiple fixed seats (12), the number of which is equal to the number of mounting blocks (9); the multiple fixed seats (12) and multiple mounting blocks (9) are alternately distributed on the turntable (8), and the fixed seats (12) are fixedly connected to the turntable (8); pressing blocks (13) are rotatably connected to each of the fixed seats (12) near the two mounting blocks (9), and the pressing blocks (13) are driven to rotate by the fixed seats (12) when powered; the pressing blocks (13) are engaged with ball bearings and the ball bearings are in contact with the mating block (10).

3. The dust removal and denitrification treatment device for flue gas at the tail end of a power plant boiler according to claim 1, characterized in that: The first rotating mechanism includes a fixed cylinder (15), which is sleeved on the connecting shaft between the turntable (8) and the motor. The upper end of the fixed cylinder (15) is fixedly connected to the fixed frame (6), and the bottom end of the fixed cylinder (15) is fixedly connected to a first gear (16). The first gear (16) and the fixed cylinder (15) are both clearance-fitted with the connecting shaft between the turntable (8) and the motor. The mounting block (9) is provided with teeth, and the first gear (16) meshes with all the mounting blocks (9) at the same time.

4. The dust removal and denitrification treatment device for flue gas at the tail end of a power plant boiler according to claim 1, characterized in that: The sealing mechanism includes two symmetrically arranged arc-shaped sealing plates (20), both of which are slidably connected to the dust collection box (2); a sealing plate (21) is fixedly connected to the inner wall of the dust collection box (2) at the bottom position of the two arc-shaped sealing plates (20), and a lower sealing groove (22) is opened on the sealing plate (21); an upper sealing groove (23) is opened on both sides of the bottom surface of the turntable (8) at each mounting block (9); the upper and lower ends of the arc-shaped sealing plate (20) are slidably connected to the upper sealing groove (23) and the lower sealing groove (22) respectively; the arc-shaped sealing plate (20) on the left side is slidably connected to the upper sealing groove (23) and the lower sealing groove (22) respectively; A connecting rod (24) is fixedly connected to the upper end of the sealing plate (20) and the bottom end of the right arc-shaped sealing plate (20). A rotating rod (25) is fixedly connected to the right end of the left connecting rod (24) and the left end of the right connecting rod (24). The rotating rod (25) is rotatably connected to the dust collector (2) and a first bevel gear (26) is fixedly connected to the upper end of the rotating rod (25). A second bevel gear (27) meshes with the first bevel gear (26). The second bevel gear (27) is rotatably connected to the dust collector (2) and a second gear (28) is fixedly connected to the second bevel gear (27).

5. The dust removal and denitrification treatment device for flue gas at the tail end of a power plant boiler according to claim 4, characterized in that: The driving mechanism includes a cylinder (29), the upper part of which is fixedly connected to the fixed frame (6) and the lower part of which is fixedly connected to an annular frame (30). The annular frame (30) is sleeved on the dust collector (2) and slidably connected to the dust collector (2). Racks (31) are symmetrically fixedly connected to the left and right ends of the annular frame (30), and the two racks (31) mesh with two second gears (28) respectively. A first push rod (32) is fixedly connected to the bottom of the tooth portion of the rack (31). A second push rod (33) is sleeved on the fixed rod (5) at the bottom of the rotating frame (17), and the first push rods (32) on both the left and right sides are located directly below the second push rods (33). A second rotating mechanism is provided on the rotating frame (17), which is used to drive the rotating frame (17) to rotate 180 degrees when the rotating frame (17) moves to the uppermost position.

6. The dust removal and denitrification treatment device for flue gas at the tail end of a power plant boiler according to claim 5, characterized in that: The second rotating mechanism includes a sliding block (34), which is sleeved on the fixed rod (5) and slidably connected to the fixed rod (5); the sliding block (34) is rotatably connected to the rotating frame (17), and a ratchet (35) is fixedly connected above the sliding block (34), the ratchet (35) and the fixed rod (5) are in clearance fit; pawls (36) are fixedly connected on both sides of the ratchet (35) on the rotating frame (17), and both pawls (36) are engaged with the ratchet (35); two helical rods (37) are fixedly connected on the rotating frame (17), and the two helical rods (37) are distributed in a circumferential array on the rotating frame (17). On the rotating frame (17), the projection of the spiral rod (37) from top to bottom on the rotating frame (17) is a semi-circular shape; the upper end of the fixed rod (5) is symmetrically fixedly connected to the front and rear sides of the connecting frame (38), and the inner side of the connecting frame (38) is rotatably connected to the rotating block (39). The rotating block (39) is fitted with a torsion spring (40) at the connection point with the connecting frame (38). One end of the torsion spring (40) is fixedly connected to the rotating block (39) and the other end is fixedly connected to the connecting frame (38); the connecting frame (38) is fixedly connected to a stop block (41) above the rotating block (39), and the stop block (41) is in contact with the upper part of the rotating block (39).

7. The dust removal and denitrification treatment device for flue gas at the tail end of a power plant boiler according to claim 1, characterized in that: The dust collector (2) is fixedly connected to a dust discharge box (42) on its bottom side. The inner cavity of the dust discharge box (42) is cylindrical. The dust discharge box (42) is provided with a dust discharge plate (43), which is sealed and fitted to the inner wall of the dust discharge box (42). The dust discharge plate (43) has six dust discharge chambers, and the dust discharge chambers on the upper and lower sides of the dust discharge plate are connected to the upper and lower interfaces of the dust discharge box. A second motor (44) is fixedly connected to the dust discharge box (42), and the output shaft of the second motor (44) is fixedly connected to the dust discharge plate (43).

8. A method for dust removal and denitrification treatment of flue gas at the tail end of a power plant boiler, applicable to the dust removal and denitrification treatment device for flue gas at the tail end of a power plant boiler as described in any one of claims 1-7, characterized in that: The specific steps of this method are as follows: Step 1: The flue gas is introduced into the denitrification box. After the flue gas is denitrified in the denitrification box (1), it enters the dust removal box (2) through the gas pipe (3). Step 2: After the flue gas in the dust collector (2) passes through the dust collector bag (4), the dust is filtered and adheres to the dust collector bag (4); Step 3: Start the cleaning mechanism to clean the dust attached to the dust collector bag (4); Step 4: After the dust collector bag (4) is blocked, start the replacement mechanism. The replacement mechanism will replace the blocked dust collector bag (4) with a new dust collector bag (4) without affecting the dust collection of other dust collector bags (4).

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