Exhaust gas dust removal and purification device

Abstract

The invention discloses an exhaust gas dust removal and purification device, which belongs to the field of exhaust gas treatment. The device comprises a smoke exhaust pipe and a first smoke inlet pipe connected to the smoke exhaust pipe, a side wall of the smoke exhaust pipe is connected with a mounting tube, the mounting tube is parallel to the axis of the smoke exhaust pipe, a turntable is rotatably connected in the mounting tube, a plurality of electrode sheets are connected to the turntable in a ring array, the plurality of electrode sheets are driven by the turntable and are alternately located in the smoke exhaust pipe; a rotating rod is rotatably connected to the side wall of the turntable, a gear is fixedly connected to the top of the rotating rod, teeth matching the gear are arranged on the inner wall of the mounting tube, a reciprocating screw is coaxially connected to the bottom of the rotating rod, a scraper is reciprocatingly slidably connected to the reciprocating screw, and the scraper is attached to the electrode sheet; the invention can realize efficient exhaust gas dust removal and purification by adsorbing dust particles in the exhaust gas through the electrode sheet, and combines the design of the scraper sheet reciprocatingly sliding to remove dust, and automatically realizes the cleaning of the electrode sheet through mechanical transmission, thereby reducing maintenance cost and workload.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas treatment, in particular to a tail gas dust removal and purification device. Background Art

[0002] With the acceleration of industrialization and the continuous growth of electricity demand, power production facilities such as thermal power plants have become important energy supply bases. However, these power plants will produce a large amount of exhaust gas during the power generation process, and the exhaust gas contains a large amount of dust particles. If these exhaust gases are directly discharged into the atmosphere without effective treatment, they will cause serious harm to the environment.

[0003] In order to cope with this severe environmental challenge, power plant tail gas treatment technology has been widely studied and applied. Among them, electrostatic precipitator technology, as an efficient and reliable dust removal method, occupies an important position in power plant tail gas treatment. This technology uses a high-voltage electric field to ionize the gas. The dust particles in the gas are charged and deposited on the electrode under the action of the electric field force, thereby achieving effective removal of particulate matter in the tail gas.

[0004] However, traditional electrostatic precipitators have shortcomings during operation, such as a large amount of dust adhering to the electrode plates, resulting in reduced dust removal efficiency and increased energy consumption. Summary of the invention

[0005] The purpose of the present invention is to provide an exhaust gas dust removal and purification device, which solves the problem that a lot of dust adheres to the electrode sheet, resulting in reduced dust removal efficiency and increased energy consumption.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: an exhaust gas dust removal and purification device, comprising a smoke exhaust pipe and a first smoke inlet pipe connected to the smoke exhaust pipe, a mounting tube connected to the side wall of the smoke exhaust pipe, the mounting tube is parallel to the axis of the smoke exhaust pipe, a turntable is rotatably connected in the mounting tube, a plurality of electrode sheets are connected to the turntable in a circular array, and the plurality of electrode sheets are driven by the turntable and alternately located in the smoke exhaust pipe;

[0007] A rotating rod is connected to the side wall of the rotating disk in a fixed axis rotation manner, a gear is fixedly connected to the top of the rotating rod, teeth matching the gear are arranged on the inner wall of the mounting cylinder, a reciprocating screw is coaxially connected to the bottom of the rotating rod, a scraper is reciprocatingly slidably connected to the reciprocating screw, and the scraper is attached to the electrode sheet;

[0008] When the rotating disk rotates, the gear in the mounting cylinder meshes with the teeth, so that the scraper slides back and forth along the axial direction of the reciprocating screw to scrape off the dust attached to the electrode sheet.

[0009] Preferably, an arc-shaped conductive sheet is connected to the top of the mounting tube, and the electrode sheet moving in the smoke exhaust pipe contacts the arc-shaped conductive sheet and is energized.

[0010] Preferably, a collar is slidably sleeved on the reciprocating screw, the scraper block is fixedly connected to the collar, a slider is rotatably connected inside the collar, and the slider slides in the thread groove of the reciprocating screw.

[0011] Preferably, the outer wall of the smoke exhaust end of the smoke exhaust pipe is connected to a motor, the output end of the motor is connected to a drive shaft, the drive shaft passes through the smoke exhaust pipe and the part inside it is connected to blades, the end of the drive shaft away from the motor is coaxially connected to a worm, the middle of the turntable is connected to a rotating shaft, and the top of the rotating shaft is connected to a worm wheel meshing with the worm.

[0012] Preferably, the bottom of the smoke exhaust pipe is connected to a second smoke inlet pipe, the bottom of the second smoke inlet pipe is connected to a water tank, the water tank is connected to a third smoke inlet pipe, the third smoke inlet pipe is connected to the first smoke inlet pipe, the bottom end of the second smoke inlet pipe is located above the liquid level in the water tank, and the bottom end of the third smoke inlet pipe is located below the liquid level in the water tank.

[0013] Preferably, a drain pipe is connected to the bottom wall of the water tank, and a valve is provided on the drain pipe.

[0014] Preferably, a filter box is placed in the water tank, and the bottom end of the third smoke inlet pipe is located in the filter box.

[0015] Preferably, it includes a switching mechanism, which includes a first baffle and a second baffle, the first baffle and the second baffle are commonly connected with a round rod, the first baffle rotates in the first smoke inlet pipe, and the second baffle rotates in the third smoke inlet pipe, the plate surface of the first baffle is perpendicular to the plate surface of the second baffle, and when the round rod rotates ninety degrees, the exhaust gas enters the smoke exhaust pipe after passing through the first smoke inlet pipe or the third smoke inlet pipe.

[0016] Preferably, a piston cylinder is connected to the outer wall of the smoke exhaust pipe, a piston plate is slidably connected in the piston cylinder, a piston rod is connected to the piston plate, the piston rod passes through the smoke exhaust pipe and is connected to an isolation plate, a pressure tube is connected to the piston cylinder, when the pressure tube transmits pressure to the piston cylinder, the piston rod is pushed so that the isolation plate blocks the connecting port between the mounting cylinder and the smoke exhaust pipe, so that the electrode sheet does not contact the exhaust gas;

[0017] A pull rope is connected to the lower part of the isolation plate, and the pull rope is inserted into the second smoke inlet pipe and a blocking ball is connected to the end thereof. When the piston rod is shortened, the isolation plate pulls the pull rope so that the blocking ball blocks the lower port of the second smoke inlet pipe, and when the piston rod is extended, the isolation plate releases the pull rope so that the blocking ball is away from the lower port of the second smoke inlet pipe.

[0018] Preferably, the outer wall of the first smoke inlet pipe is connected with a hydraulic rod, a conduction pipe is connected between the hydraulic rod and the piston cylinder, the output end of the hydraulic rod is connected with a rack, and the top of the round rod is connected with a transmission tooth meshing with the rack;

[0019] When the piston rod extends out of the piston cylinder, the piston plate pushes the medium in the piston cylinder into the hydraulic rod, so that the rack is extended to drive the transmission tooth to rotate ninety degrees.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention uses an electrode sheet to absorb dust particles in the exhaust gas, and combines it with a design in which a scraper block slides back and forth to remove dust, thereby achieving efficient exhaust gas dust removal and purification. The entire dust removal process does not require human intervention, and the cleaning of the electrode sheet is automatically achieved through mechanical transmission, thereby reducing maintenance costs and workload. The installation tube is designed to be parallel to the smoke exhaust pipe, which not only saves space, but also makes the entire dust removal and purification device compact in structure, and easy to install and integrate into the existing exhaust gas treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 is a cross-sectional view of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the turntable of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the reciprocating screw of the present invention;

[0026] Figure 5 This is a schematic structural diagram of the ball blocking part of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the piston plate of the present invention.

[0028] In the figure: 1. smoke exhaust pipe; 11. first smoke inlet pipe; 12. motor; 13. blade; 2. mounting tube; 21. rotating shaft; 22. worm gear; 23. worm; 24. turntable; 25. electrode sheet; 26. arc-shaped conductive sheet; 27. rotating rod; 28. gear; 29. ​​reciprocating screw; 291. scraper block; 292. collar; 293. slider; 3. water tank; 31. third smoke inlet pipe; 32. second smoke inlet pipe; 33. filter box; 34. drain pipe; 4. piston cylinder; 41. piston rod; 411. pull rope; 412. blocking ball; 42. isolation plate; 43. piston plate; 44. suppression pipe; 45. conduction pipe; 5. hydraulic rod; 51. rack; 52. transmission gear; 53. round rod; 54. first baffle; 55. second baffle. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Reference Figure 1-Figure 6 The present embodiment provides a technical solution: an exhaust gas dust removal and purification device, comprising a smoke exhaust pipe 1 and a first smoke inlet pipe 11 connected to the smoke exhaust pipe 1, a mounting tube 2 is connected to the side wall of the smoke exhaust pipe 1, the mounting tube 2 is parallel to the axis of the smoke exhaust pipe 1, a turntable 24 is rotatably connected in the mounting tube 2, a plurality of electrode sheets 25 are connected to the turntable 24 in a circular array, the plurality of electrode sheets 25 are driven by the turntable 24 and are alternately located in the smoke exhaust pipe 1; a fixed axis is rotatably connected to the side wall of the turntable 24 The rotating rod 27 has a gear 28 fixedly connected to the top thereof, and the inner wall of the mounting tube 2 is provided with teeth cooperating with the gear 28. The bottom of the rotating rod 27 is coaxially connected with a reciprocating screw 29, and a scraper block 291 is reciprocatingly slidably connected to the reciprocating screw 29, and the scraper block 291 is attached to the electrode sheet 25. When the turntable 24 rotates, the gear 28 located in the mounting tube 2 is meshed with the teeth, so that the scraper block 291 slides reciprocatingly along the axial direction of the reciprocating screw 29 to scrape off the dust attached to the electrode sheet 25.

[0031] The exhaust gas first enters the exhaust pipe 1 through the first smoke inlet pipe 11. On the side wall of the exhaust pipe 1, there is installed a mounting tube 2 parallel to its axis. A turntable 24 is provided inside the mounting tube 2. A plurality of electrode sheets 25 are connected in a circular array on the turntable 24. As the turntable 24 rotates, these electrode sheets 25 will alternately enter the exhaust pipe 1 and contact with the exhaust gas flowing through. The electrode sheets 25 absorb dust particles in the exhaust gas through electrostatic action. A rotating rod 27 is connected to the fixed axis rotation on the side wall of the turntable 24. A gear 28 is fixed on the top of the rotating rod 27. The inner wall of the mounting tube 2 is designed with teeth meshing with the gear 28. When the turntable 24 rotates, the gear 28 rotates accordingly and meshes with the teeth for subsequent cleaning actions. Power is provided, and a reciprocating screw 29 is coaxially connected to the bottom of the rotating rod 27. On the reciprocating screw 29, there is a scraper block 291 which is reciprocatingly slidably connected thereto. The scraper block 291 fits tightly against the surface of the electrode sheet 25. As the turntable 24 rotates, the meshing of the gear 28 and the teeth drives the rotating rod 27 and the reciprocating screw 29 to rotate, thereby causing the scraper block 291 to slide reciprocatingly in the axial direction of the reciprocating screw 29. This sliding motion enables the scraper block 291 to effectively scrape off the dust attached to the electrode sheet 25, keep the electrode sheet 25 clean, ensure the dust removal efficiency, and a large amount of scraped dust falls into the mounting tube 2, preventing the flow of exhaust gas from disturbing the falling dust and causing a large amount of dust to be discharged from the smoke exhaust pipe 1.

[0032] The top of the mounting tube 2 is connected with an arc-shaped conductive sheet 26 , and the electrode sheet 25 moving in the smoke exhaust pipe 1 contacts the arc-shaped conductive sheet 26 and is energized.

[0033] When the electrode sheet 25 contacts the arc-shaped conductive sheet 26 and is energized, an electric field is formed between them. This electric field can attract and capture charged particles (such as dust, particulate matter, etc.) in the exhaust gas, thereby performing dust removal. Since the electrode sheet 25 enters the smoke exhaust pipe 1 alternately, each electrode sheet 25 is briefly energized when it contacts the arc-shaped conductive sheet 26, and when the electrode sheet 25 is energized, it is in the smoke exhaust pipe 1 for dust removal. After the dust removal operation, the electrode sheet 25 enters the installation tube 2 to be powered off and clean the adsorbed dust, thereby maintaining effective dust removal capabilities throughout the entire process.

[0034] A sleeve ring 292 is slidably sleeved on the reciprocating screw 29 , and the scraper block 291 is fixedly connected to the sleeve ring 292 . A slider 293 is rotatably connected in the sleeve ring 292 , and the slider 293 slides in the thread groove of the reciprocating screw 29 .

[0035] Two thread grooves with opposite rotation directions are provided on the reciprocating screw 29, and the first positions of the two thread grooves are connected to each other. The slider 293 slides alternately in the two thread grooves, and the slider 293 rotates in the ring 292, so as to ensure that when the slider 293 slides at the bottom of the thread groove and transfers to another thread groove to slide, the slider 293 can rotate and slide into another thread groove, ensuring that the ring 292 can slide back and forth on the reciprocating screw 29, so that the scraper 291 can clean dust for the electrode sheet 25 when the power is off.

[0036] The outer wall of the smoke exhaust end of the smoke exhaust pipe 1 is connected to a motor 12, the output end of the motor 12 is connected to a drive shaft, the drive shaft passes through the smoke exhaust pipe 1 and the part inside it is connected to a blade 13, the end of the drive shaft away from the motor 12 is coaxially connected to a worm 23, the middle of the turntable 24 is connected to a rotating shaft 21, and the top of the rotating shaft 21 is connected to a worm wheel 22 meshing with the worm 23.

[0037] The output end of the motor 12 is connected to a drive shaft, which not only passes through the smoke exhaust pipe 1, but also is connected to the blades 13 in its internal part. When the motor 12 is started, it drives the drive shaft to rotate, thereby driving the blades 13 to rotate inside the smoke exhaust pipe 1. A worm 23 is coaxially connected to the end of the drive shaft away from the motor 12. The worm 23 is meshed with the worm gear 22 on the rotating shaft 21 connected to the middle part of the turntable 24, converting the high-speed rotation of the motor 12 into a low-speed, high-torque rotation of the turntable 24, thereby improving the stability and reliability of the turntable 24 driving the electrode sheet 25 to rotate by increasing the torque by reducing speed.

[0038] The bottom of the smoke exhaust pipe 1 is connected to the second smoke inlet pipe 32, the bottom of the second smoke inlet pipe 32 is connected to the water tank 3, the water tank 3 is connected to the third smoke inlet pipe 31, the third smoke inlet pipe 31 is connected to the first smoke inlet pipe 11, the bottom end of the second smoke inlet pipe 32 is located above the liquid level in the water tank 3, and the bottom end of the third smoke inlet pipe 31 is located below the liquid level in the water tank 3.

[0039] When the exhaust gas humidity is high or wet dust removal is required, the exhaust gas first enters the third smoke inlet pipe 31 through the first smoke inlet pipe 11, and then enters the water tank 3 through the third smoke inlet pipe 31. The bottom end of the third smoke inlet pipe 31 is located below the liquid level in the water tank 3, so that the dust in the exhaust gas is adsorbed by the water in the water tank 3, and other gases enter the smoke exhaust pipe 1 through the second smoke inlet pipe 32 and are then discharged through the smoke exhaust pipe 1.

[0040] A drain pipe 34 is connected to the bottom wall of the water tank 3 , and a valve is provided on the drain pipe 34 .

[0041] The provision of the drain pipe 34 enables the water in the water tank 3 to be discharged and replenished, and opening the valve on the drain pipe 34 allows the internal space of the water tank 3 to communicate with the external space.

[0042] A filter box 33 is placed in the water tank 3 , and the bottom end of the third smoke inlet pipe 31 is located in the filter box 33 .

[0043] The setting of the filter box 33 isolates the dust entering the water tank 3, thereby preventing the dust from spreading in large quantities in the water tank 3. A box door is also provided on the upper part of the water tank 3. The filter box 33 can be taken out of the water tank 3 by opening the box door, ensuring that the dust can be conveniently collected and at the same time improving the utilization rate of the water in the water tank 3.

[0044] The switching mechanism includes a first baffle plate 54 and a second baffle plate 55. The first baffle plate 54 and the first baffle plate 54 are commonly connected with a round rod 53. The first baffle plate 54 rotates in the first smoke inlet pipe 11, and the second baffle plate 55 rotates in the third smoke inlet pipe 31. The plate surface of the first baffle plate 54 is perpendicular to the plate surface of the second baffle plate 55. When the round rod 53 rotates ninety degrees, the exhaust gas enters the smoke exhaust pipe 1 after passing through the first smoke inlet pipe 11 or the third smoke inlet pipe 31.

[0045] The first baffle 54 rotates in the first smoke inlet pipe 11, and is used to control whether the exhaust gas enters the smoke exhaust pipe 1 for electrostatic dust removal. The second baffle 55 rotates in the third smoke inlet pipe 31 and is located above the water tank 3, and is used to control whether the exhaust gas enters the water tank 3 for wet dust removal. The first baffle 54 and the second baffle 55 are connected by a round rod 53 to ensure that they can rotate synchronously. When the round rod 53 is in the initial position, the first baffle 54 allows the exhaust gas to enter the smoke exhaust pipe 1 from the first smoke inlet pipe 11, and the second baffle 55 blocks the exhaust gas from entering the water tank 3. At this time, the device is in the electrostatic dust removal mode. When it is necessary to switch to the wet dust removal mode, the round rod 53 rotates 90 degrees, so that the first baffle 54 blocks the exhaust gas from entering the smoke exhaust pipe 1, and the second baffle 55 opens, allowing the exhaust gas to enter the water tank 3 for wet dust removal.

[0046] A piston cylinder 4 is connected to the outer wall of the smoke exhaust pipe 1, and a piston plate 43 is slidably connected inside the piston cylinder 4. A piston rod 41 is connected to the piston plate 43. The piston rod 41 passes through the smoke exhaust pipe 1 and is connected to an isolation plate 42. A pressure tube 44 is connected to the piston cylinder 4. When the pressure tube 44 transmits pressure to the piston cylinder 4, the piston rod 41 is pushed so that the isolation plate 42 blocks the connecting port between the mounting cylinder 2 and the smoke exhaust pipe 1, so that the electrode sheet 25 does not contact the exhaust gas; a pull rope 411 is connected to the lower part of the isolation plate 42, and the pull rope 411 is inserted into the second smoke inlet pipe 32 and a blocking ball 412 is connected at its end. When the piston rod 41 is shortened, the isolation plate 42 pulls the pull rope 411 so that the blocking ball 412 blocks the lower port of the second smoke inlet pipe 32, and when the piston rod 41 is extended, the isolation plate 42 releases the pull rope 411 so that the blocking ball 412 is away from the lower port of the second smoke inlet pipe 32.

[0047] The piston cylinder 4 is installed on the outer wall of the smoke exhaust pipe 1, and is slidably connected with a piston plate 43 inside. The piston plate 43 is connected to the isolation plate 42 through a piston rod 41. When the pressure tube 44 transmits pressure to the piston cylinder 4, the piston plate 43 is pushed, and the isolation plate 42 blocks the connecting port between the installation cylinder 2 and the smoke exhaust pipe 1 through the piston rod 41. In this way, the electrode sheet 25 no longer contacts the exhaust gas, thereby realizing rapid isolation of the electrostatic dust removal part. A pull rope 411 is connected to the lower part of the isolation plate 42, and the pull rope 411 is inserted into the second smoke inlet pipe 32, and a blocking ball 412 is connected to its end. When the piston rod 41 is shortened, that is, the isolation plate 42 moves laterally and moves away from the third smoke inlet pipe 31 in the horizontal direction, it will pull the pull rope 411, so that the blocking ball 412 moves upward and blocks the lower port of the second smoke inlet pipe 32, thus blocking the exhaust gas. The exhaust gas is stopped from entering the water tank 3 through the second smoke inlet pipe 32 for wet dust removal, and the steam in the water tank 3 is prevented from entering the smoke exhaust pipe 1 and causing the humidity of the exhaust gas to increase. On the contrary, when the piston rod 41 is extended, that is, the isolation plate 42 moves laterally and approaches the third smoke inlet pipe 31 in the horizontal direction, the isolation plate 42 releases the pull rope 411. At this time, the pull rope 411 is relaxed, and the blocking ball 412 moves away from the lower port of the second smoke inlet pipe 32 under the action of gravity, so that the port is opened. When the blocking ball 412 moves downward and away from the lower port of the second smoke inlet pipe 32, not only the channel for wet dust removal is opened, but also the dust that falls to the bottom of the smoke exhaust pipe 1 is allowed to be discharged into the water tank 3 through the second smoke inlet pipe 32. In this way, it can prevent dust from accumulating in the smoke exhaust pipe 1 and possibly being lifted up by factors such as wind pressure and then discharged from the smoke exhaust pipe 1, causing secondary pollution.

[0048] The outer wall of the first smoke inlet pipe 11 is connected to a hydraulic rod 5, a conduction tube 45 is connected between the hydraulic rod 5 and the piston cylinder 4, the output end of the hydraulic rod 5 is connected to a rack 51, and the top of the round rod 53 is connected to a transmission tooth 52 meshing with the rack 51; when the piston rod 41 extends out of the piston cylinder 4, the piston plate 43 pushes the medium in the piston cylinder 4 into the hydraulic rod 5, so that the rack 51 extends to drive the transmission tooth 52 to rotate ninety degrees.

[0049] When the piston rod 41 extends from the piston cylinder 4, it pushes the piston plate 43 to move in the piston cylinder 4. In this process, the piston plate 43 compresses the medium in the piston cylinder 4 and pushes it into the hydraulic rod 5, and the output end of the hydraulic rod 5 is connected to the rack 51. As the medium inside the hydraulic rod 5 increases (i.e., the piston rod 41 extends), the rack 51 will extend outward accordingly, and the top of the round rod 53 is connected with a transmission tooth 52, which is meshed with the rack 51. Therefore, when the rack 51 extends, it will drive the transmission tooth 52 to rotate. Since the transmission tooth 52 and the round rod 53 are rigidly connected, the rotation of the transmission tooth 52 will drive the round rod 53 to rotate 90 degrees, thereby realizing the switching between electrostatic dust removal and wet dust removal. When the humidity sensor located in the first smoke inlet pipe 11 detects a decrease in humidity, the suppression tube 44 draws back the medium in the piston cylinder 4, so that the wet dust removal is switched back to electrostatic dust removal.

[0050] It should be noted here that this device only performs dust removal operations on the exhaust gas of the power plant. The exhaust gas entering the device and the exhaust gas discharged should also be treated as needed.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An exhaust gas dust removal and purification device, comprising a smoke exhaust pipe (1) and a first smoke inlet pipe (11) connected to the smoke exhaust pipe (1), characterized in that: The side wall of the smoke exhaust pipe (1) is connected to a mounting tube (2), the mounting tube (2) is parallel to the axis of the smoke exhaust pipe (1), a rotating disk (24) is rotatably connected inside the mounting tube (2), a plurality of electrode sheets (25) are connected to the rotating disk (24) in a circular array, and the plurality of electrode sheets (25) are driven by the rotating disk (24) and are alternately located inside the smoke exhaust pipe (1); A rotating rod (27) is rotatably connected to the side wall of the rotating disk (24); a gear (28) is fixedly connected to the top of the rotating rod (27); teeth cooperating with the gear (28) are provided on the inner wall of the mounting cylinder (2); a reciprocating screw (29) is coaxially connected to the bottom of the rotating rod (27); a scraper (291) is reciprocatingly slidably connected to the reciprocating screw (29); and the scraper (291) is attached to the electrode sheet (25); When the rotating disk (24) rotates, the gear (28) located in the mounting cylinder (2) meshes with the teeth, so that the scraper (291) slides back and forth along the axial direction of the reciprocating screw (29) to scrape away dust attached to the electrode sheet (25); The top of the mounting tube (2) is connected to an arc-shaped conductive sheet (26), and the electrode sheet (25) moving in the smoke exhaust pipe (1) contacts the arc-shaped conductive sheet (26) and is energized.

2. The exhaust gas dust removal and purification device according to claim 1, characterized in that: A collar (292) is slidably sleeved on the reciprocating screw (29), the scraper block (291) is fixedly connected to the collar (292), a slider (293) is rotatably connected inside the collar (292), and the slider (293) slides in the thread groove of the reciprocating screw (29).

3. The exhaust gas dust removal and purification device according to claim 2 is characterized in that: The outer wall of the smoke exhaust end of the smoke exhaust pipe (1) is connected to a motor (12), the output end of the motor (12) is connected to a drive shaft, the drive shaft passes through the smoke exhaust pipe (1) and the portion inside the drive shaft is connected to a blade (13), one end of the drive shaft away from the motor (12) is coaxially connected to a worm (23), the middle of the rotating disk (24) is connected to a rotating shaft (21), and the top of the rotating shaft (21) is connected to a worm wheel (22) meshing with the worm (23).

4. The exhaust gas dust removal and purification device according to claim 3 is characterized in that: The bottom of the smoke exhaust pipe (1) is connected to a second smoke inlet pipe (32), the bottom of the second smoke inlet pipe (32) is connected to a water tank (3), the water tank (3) is connected to a third smoke inlet pipe (31), the third smoke inlet pipe (31) is connected to the first smoke inlet pipe (11), the bottom end of the second smoke inlet pipe (32) is located above the liquid level in the water tank (3), and the bottom end of the third smoke inlet pipe (31) is located below the liquid level in the water tank (3).

5. The exhaust gas dust removal and purification device according to claim 4 is characterized in that: A drainage pipe (34) is connected to the bottom wall of the water tank (3), and a valve is provided on the drainage pipe (34).

6. The exhaust gas dust removal and purification device according to claim 5, characterized in that: A filter box (33) is placed in the water tank (3), and the bottom end of the third smoke inlet pipe (31) is located in the filter box (33).

7. The exhaust gas dust removal and purification device according to claim 6, characterized in that: The invention comprises a switching mechanism, wherein the switching mechanism comprises a first baffle plate (54) and a second baffle plate (55), wherein the first baffle plate (54) and the second baffle plate (55) are connected to a round rod (53), wherein the first baffle plate (54) rotates in the first smoke inlet pipe (11), and the second baffle plate (55) rotates in the third smoke inlet pipe (31), wherein the plate surface of the first baffle plate (54) is perpendicular to the plate surface of the second baffle plate (55), and when the round rod (53) rotates 90 degrees, the exhaust gas enters the smoke exhaust pipe (1) after passing through the first smoke inlet pipe (11) or the third smoke inlet pipe (31).

8. The exhaust gas dust removal and purification device according to claim 7, characterized in that: The outer wall of the smoke exhaust pipe (1) is connected to a piston cylinder (4), a piston plate (43) is slidably connected inside the piston cylinder (4), a piston rod (41) is connected to the piston plate (43), the piston rod (41) passes through the smoke exhaust pipe (1) and is connected to an isolation plate (42), a pressure tube (44) is connected to the piston cylinder (4), and when the pressure tube (44) transmits pressure to the piston cylinder (4), the piston rod (41) is pushed so that the isolation plate (42) blocks the connecting port between the mounting cylinder (2) and the smoke exhaust pipe (1), so that the electrode sheet (25) does not contact the exhaust gas; A pull rope (411) is connected to the lower part of the isolation plate (42), and the pull rope (411) is inserted into the second smoke inlet pipe (32) and is connected to a blocking ball (412) at the end thereof. When the piston rod (41) is shortened, the isolation plate (42) pulls the pull rope (411) so that the blocking ball (412) blocks the lower end of the second smoke inlet pipe (32); and when the piston rod (41) is extended, the isolation plate (42) releases the pull rope (411) so that the blocking ball (412) is away from the lower end of the second smoke inlet pipe (32).

9. The exhaust gas dust removal and purification device according to claim 8, characterized in that: The outer wall of the first smoke inlet pipe (11) is connected to a hydraulic rod (5), a conduction pipe (45) is connected between the hydraulic rod (5) and the piston cylinder (4), an output end of the hydraulic rod (5) is connected to a rack (51), and the top of the round rod (53) is connected to a transmission tooth (52) meshing with the rack (51); When the piston rod (41) extends out of the piston cylinder (4), the piston plate (43) pushes the medium in the piston cylinder (4) into the hydraulic rod (5), so that the rack (51) extends to drive the transmission tooth (52) to rotate ninety degrees.

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