Tail gas purification device and method for thermal power plant

Abstract

The invention relates to the technical field of tail gas purification devices, and discloses a tail gas purification device and method for a thermal power plant, the tail gas purification device comprises a purification box, the left side of the purification box fixedly communicates with a fixed pipe, the left side of the fixed pipe is provided with a connecting pipe, and the inner wall of the purification box is slidably connected with an electrostatic filter plate; the front side of the electrostatic filter plate is fixedly connected with a fixing plate, the two sides of the fixing plate are fixedly connected with trapezoidal plates, and the front side of the purification box is fixedly connected with a connecting plate. When the device is used for treating tail gas, the electrostatic filter plate is started to work to adsorb dust particles in the tail gas, so that the tail gas purification efficiency of the device is improved; meanwhile, when the equipment is maintained and replaced, the two mounting shells can be pressed at the same time to relieve limiting of the fixing plate, rapid dismounting and mounting of the equipment during maintenance are achieved, the electrostatic filter plate is more convenient to replace and maintain, the downtime of the equipment is shortened, and the overall operation efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas purification devices, specifically to an exhaust gas purification device and method for thermal power plants. Background Technology

[0002] With the acceleration of industrialization and the continuous growth of electricity demand, thermal power plants, as important energy supply bases, generate a large amount of exhaust gas during the power generation process. The exhaust gas contains pollutants that threaten human health and the quality of the ecological environment. Therefore, it is necessary to purify the exhaust gas to meet environmental protection requirements.

[0003] Patent CN218573930U discloses a flue gas purification device for a thermal power plant. The device includes a main body, an air inlet for drawing in flue gas, an air outlet for discharging purified gas, an ionizer for applying a charge to the flue gas, a dust collector for adsorbing the flue gas, a rotating device for centrifugal action on the flue ash, and a nozzle device to mitigate dust escape during manual cleaning. The main body of the purification device has an air inlet and an air outlet at both ends. The ionizer is located near the air inlet and inside the main body of the purification device. The dust collector is located on the side of the ionizer furthest from the air inlet. The bottom is connected to a second ash hopper. The nozzle device includes a downward nozzle a inside the air inlet, a downward nozzle b between the dust collector and the air outlet, and an annular inward nozzle at the top of the second ash hopper. This device alleviates the problem of secondary dispersion during dust cleaning and improves the efficiency and practicality of the purification device. Although the device can quickly filter and clean the exhaust gas, it is difficult to guarantee the temperature of the gas during operation, which can easily lead to low efficiency in exhaust gas treatment. Therefore, a tail gas purification device and method for thermal power plants is proposed to solve the above-mentioned problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a tail gas purification device and method for thermal power plants, which addresses the shortcomings of the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a flue gas purification device for thermal power plants, comprising a purification box, a fixed pipe fixedly connected to the left side of the purification box, a connecting pipe installed on the left side of the fixed pipe, a recovery shell fixedly connected to the bottom of the purification box, an exhaust fan fixedly connected to the inner wall of the purification box, an electrostatic filter plate slidably connected to the inner wall of the purification box, a fixed plate fixedly connected to the front side of the electrostatic filter plate, trapezoidal plates fixedly connected to both sides of the fixed plate, a connecting plate fixedly connected to the front side of the purification box, and an elastic telescopic rod fixedly connected to the side of the connecting plate near the fixed plate. Simultaneously, a mounting shell is fixedly connected to the telescopic end, and a pressure cylinder is rotatably connected to the inner wall of the mounting shell. When treating exhaust gas from a thermal power plant, the electrostatic filter plate is activated, causing charged bodies to pass through an electric field to polarize neutral dust, thereby adsorbing dust particles in the exhaust gas and improving the equipment's purification efficiency. Furthermore, when the equipment is being repaired or replaced, pressing down on both mounting shells simultaneously releases the limiting position on the fixed plate, enabling rapid disassembly and assembly for equipment maintenance. This makes the replacement and maintenance of the electrostatic filter plate more convenient, reduces equipment downtime, and improves overall operating efficiency. In addition, it not only improves maintenance efficiency and safety but also reduces maintenance costs and extends the lifespan of the equipment. This extends the equipment's lifespan. A vacuum pump is fixedly connected to the top of the purification chamber, and its output is also fixedly connected to the vacuum pump. The inner wall of the purification chamber is equipped with an ultrasonic vibration mechanism for ultrasonic cleaning, and the circumferential surface of the fixed pipe is equipped with a leak-proof mechanism to prevent leakage. When filtering exhaust gas, the vacuum pump is activated to drive the residual heat recovery pipe to circulate the hot air inside the purification chamber, ensuring the chamber remains in a high-temperature, dry state. The electrostatic filter plate, when energized, charges impurities in the air, effectively adsorbing pollutants. The hot air circulation keeps the electrostatic plate dry, preventing moisture-induced corrosion. The adsorption efficiency is reduced, thereby improving the overall purification efficiency and further reducing the maintenance cost of the equipment; the exhaust fan is used to discharge the purified exhaust gas, the recovery shell is used to recover the filtered dust, the electrostatic filter plate is used to use electrostatic adsorption to filter dust, the rear side of the fixed plate is in contact with the front side of the purification box, the circumferential surface of the pressure cylinder is in contact with the front side of the fixed plate, and the fixed plate moves on the movement trajectory of the pressure cylinder, the suction pump is used to extract the hot air inside the purification box, and the side of the residual heat recovery pipe away from the suction pump is fixedly connected to the inner wall of the purification box, and the residual heat recovery pipe is used to recycle the residual heat.

[0006] Preferably, the ultrasonic vibration mechanism includes a threaded rod, a gear fixedly connected to the bottom of the threaded rod, a scraper threadedly connected to the circumferential surface of the threaded rod, a limit rod fixedly connected to the inner wall of the purification box, and a rack fixedly connected to the inner wall of the electrostatic filter plate. While the electrostatic filter plate is being pulled away for cleaning, the scraper moves upwards, removing dust adsorbed on the outer surface of the electrostatic filter plate. This further saves maintenance time and costs for staff, and can more effectively remove accumulated pollutants, reducing the decrease in filtration efficiency caused by dust blockage. A rotating rod is rotatably connected to the inner wall of the purification box, a connecting frame is fixedly connected to the circumferential surface of the rotating rod, and ultrasonic devices are fixedly connected to both sides of the connecting frame. During filtration, starting the motor will drive the rotating rod to rotate through the output end, causing the ultrasonic devices to rotate and emit ultrasonic waves, thus activating the ultrasonic vibration mechanism. The electrostatic filter plate begins to vibrate, shaking dust particles from its outer surface into the interior of the recovery shell. Ultrasonic vibration removes dust from the surface of the electrostatic filter plate, maintaining its efficient operation and filtration effect. Simultaneously, the ultrasound can cause particulate matter in the exhaust gas to agglomerate and settle, improving the purification effect and further enhancing the stability of the equipment during purification. The circumferential surface of the threaded rod is rotatably connected to the inner wall of the purification chamber. The side of the rack away from the electrostatic filter plate meshes with the circumferential surface of the gear. The inner wall of the scraper contacts the circumferential surface of the limiting rod, which limits the scraper's position. The scraper contacts both sides of the electrostatic filter plate and removes dust from its outer surface. A motor is fixedly connected to the front of the purification chamber, and the motor's output end is fixedly connected to the front end of the rotating rod. The ultrasonic device emits ultrasound to cause the electrostatic filter plate to vibrate.

[0007] Preferably, the leak-proof mechanism includes a telescopic slide rod, with a flipping plate hinged to the bottom of the telescopic slide rod. A limit post is fixedly connected to the inner wall of the recovery shell. When the equipment is being cleaned, the scraper drives the flipping plate to rotate, opening the ash outlet of the recovery shell, thereby allowing the dust to be discharged and recovered. Automatically opening the ash outlet can reduce the time and effort of manual operation, improve maintenance efficiency, increase purification efficiency, reduce worker workload, and improve indoor environmental hygiene. A long rod is fixedly connected to the circumferential surface of the fixed pipe, and a sealing ring is slidably connected to the circumferential surface of the long rod via a tension spring. An L-shaped rod is fixedly connected to the circumferential surface of the limit post, and the inner wall of the L-shaped rod... The wall is equipped with pulleys. During exhaust gas treatment, leakage of exhaust gas may occur at the connection point. The L-shaped rod moves through the connecting pipe, and the L-shaped rod drives the sealing ring to seal the junction of the fixed pipe and the connecting pipe, preventing the leakage of harmful gases and dust, reducing the threat to the health of operators, and lowering the risk of safety accidents such as fires. It can improve the corrosion resistance and sealing performance of the exhaust hood, thereby eliminating potential safety hazards. The bottom of the scraper is hinged to the top of the telescopic slide rod, the flipping plate is rotatably connected to the inner wall of the recovery shell, the limiting post is used to limit the flipping plate, and the circumferential surface of the pulley contacts the circumferential surface of the sealing ring.

[0008] A method for using a flue gas purification device for a thermal power plant includes the following steps: Step 1: When a thermal power plant is in operation, it will produce a large amount of exhaust gas. At this time, the staff needs to fix the connecting pipe to the fixed pipe, and then open the exhaust valve to discharge the exhaust gas into the fixed pipe. The fixed pipe will then transport the exhaust gas into the interior of the purification box. Step 2: When the exhaust gas enters the purification chamber, the exhaust fan will be activated to work. The exhaust fan will discharge the treated exhaust gas. When it is discharged, the electrostatic filter plate will be activated. The electrostatic filter plate will use charged bodies to polarize neutral dust through an electric field and capture it by the attraction of opposite charges. Thus, the electrostatic filter plate will generate static electricity to adsorb dust particles in the exhaust gas. Step 3: When the equipment is being repaired or replaced, press down on both mounting shells at the same time. The mounting shells will cause the telescopic ends of the elastic telescopic rods to retract, thereby causing the mounting shells to retract. The mounting shells will then cause the pressure cylinder to retract, thus releasing the limit on the fixed plate. At this time, pull the handle to remove the electrostatic filter plate from the purification box for repair or replacement. Step 4: After replacement, insert the electrostatic filter plate into the cleanroom. At this time, the electrostatic filter plate moves the fixing plate, which in turn moves the trapezoidal plate. The trapezoidal plate contacts the pressure cylinder through its rear inclined surface, thereby moving the pressure cylinder. When the fixing plate enters the pressure cylinder, it will drive the pressure cylinder to reset through the telescopic end of the elastic telescopic rod, thus limiting the fixing plate and enabling quick disassembly and assembly for equipment maintenance.

[0009] The present invention, by adopting the above technical solution, can bring the following beneficial effects: 1. This exhaust gas purification device and method for thermal power plants, through the coordinated operation of a purification box, fixed pipe, connecting pipe, exhaust fan, recovery shell, fixed plate, electrostatic filter plate, trapezoidal plate, connecting plate, elastic telescopic rod, mounting shell, pressure cylinder, air pump, and residual heat recovery pipe, allows the electrostatic filter plate to operate when treating exhaust gas from thermal power plants. This allows charged bodies to pass through an electric field to polarize neutral dust particles, thereby adsorbing dust particles in the exhaust gas and improving the purification efficiency of the equipment. Simultaneously, when the equipment is being repaired or replaced, pressing down on two separate mounting shells releases the restriction on the fixed plate, enabling rapid disassembly and assembly for equipment maintenance. The replacement and maintenance of filter plates are more convenient, reducing equipment downtime and improving overall operating efficiency. Furthermore, it not only improves maintenance efficiency and safety but also reduces maintenance costs and extends equipment lifespan. When filtering exhaust gas, the exhaust pump drives the residual heat recovery pipe to circulate the hot air inside the purification chamber, ensuring the chamber remains in a high-temperature, dry state. The electrostatic filter plates, when energized, charge impurities in the air, effectively adsorbing pollutants. The hot air circulation keeps the electrostatic plates dry, preventing a decrease in adsorption efficiency due to moisture, thus improving overall purification efficiency and further reducing equipment maintenance costs.

[0010] 2. The exhaust gas purification device and method for thermal power plants utilizes the coordinated operation of racks, threaded rods, gears, and scrapers to simultaneously remove and clean the electrostatic filter plates. The electrostatic filter plates also drive the scrapers upwards to remove dust adsorbed on their outer surface, further saving maintenance time and costs for staff. This method can more effectively remove accumulated pollutants and reduce filtration efficiency loss due to dust blockage.

[0011] 3. This exhaust gas purification device and method for thermal power plants, through the coordinated operation of a limiting rod, a rotating rod, a connecting frame, and an ultrasonic device, allows the motor to rotate simultaneously with filtration. The rotating rod drives the ultrasonic device to rotate, emitting ultrasonic waves that cause the electrostatic filter plate to vibrate. This vibrates the dust particles on the outer surface of the filter plate, causing them to fall into the recovery shell. The ultrasonic vibration removes dust from the surface of the electrostatic filter plate, thus maintaining its efficient operation and filtration effect. At the same time, the ultrasonic waves can cause particulate matter in the exhaust gas to agglomerate and settle, improving the purification effect and further enhancing the stability of the equipment during purification.

[0012] 4. The exhaust gas purification device and method for thermal power plants, through the coordinated operation of the telescopic slide bar, the flipping plate, and the limiting column, when the equipment is cleaning, the scraper drives the flipping plate to rotate and open the ash outlet of the recovery shell, thereby allowing the dust to be discharged and recovered. The automatic opening of the ash outlet can reduce the time and effort of manual operation, improve maintenance efficiency, improve purification efficiency, reduce the workload of workers, and improve indoor environmental hygiene.

[0013] 5. This exhaust gas purification device and method for thermal power plants, through the coordinated operation of a long rod, a sealing ring, an L-shaped rod, and a pulley, addresses the potential exhaust gas leakage at the connection point during exhaust gas treatment. The L-shaped rod moves along the connecting pipe, and the sealing ring seals the junction of the fixed pipe and the connecting pipe, preventing the leakage of harmful gases and dust, reducing threats to operator health, and lowering the risk of fires and other safety accidents. It also improves the corrosion resistance and sealing performance of the exhaust hood, thereby eliminating potential safety hazards. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the electrostatic filter plate structure of the present invention; Figure 3 This is a schematic diagram of the pressure cylinder structure of the present invention; Figure 4 This is a schematic diagram of the ultrasonic device structure of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of the structure at point A in the middle; Figure 6 This is a schematic diagram of the flipping plate structure of the present invention; Figure 7 This is a schematic diagram of the sealing ring structure of the present invention.

[0015] In the diagram: 1. Purification box; 2. Fixed pipe; 3. Connecting pipe; 4. Exhaust fan; 5. Recovery shell; 6. Ultrasonic vibration mechanism; 61. Rack; 62. Threaded rod; 63. Gear; 64. Scraper; 65. Limiting rod; 66. Rotating rod; 67. Connecting frame; 68. Ultrasonic device; 7. Leakage prevention mechanism; 71. Telescopic slide bar; 72. Flipping plate; 73. Limiting post; 74. Long rod; 75. Sealing ring; 76. L-shaped rod; 77. Pulley; 8. Fixed plate; 9. Electrostatic filter plate; 10. Trapezoidal plate; 11. Connecting plate; 12. Elastic telescopic rod; 13. Mounting shell; 14. Pressure cylinder; 15. Air pump; 16. Residual heat recovery pipe. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1-7 One embodiment of the present invention is: a tail gas purification device for thermal power plants, including a purification box 1, a fixed pipe 2 fixedly connected to the left side of the purification box 1, a connecting pipe 3 installed on the left side of the fixed pipe 2, a recovery shell 5 fixedly connected to the bottom of the purification box 1, an exhaust fan 4 fixedly connected to the inner wall of the purification box 1, an electrostatic filter plate 9 slidably connected to the inner wall of the purification box 1, a fixed plate 8 fixedly connected to the front side of the electrostatic filter plate 9, trapezoidal plates 10 fixedly connected to both sides of the fixed plate 8, a connecting plate 11 fixedly connected to the front side of the purification box 1, an elastic telescopic rod 12 fixedly connected to the side of the connecting plate 11 near the fixed plate 8, an installation shell 13 fixedly connected to the telescopic end of the elastic telescopic rod 12, and a pressure cylinder 14 rotatably connected to the inner wall of the installation shell 13. When a thermal power plant is operating, it generates a large amount of exhaust gas. At this time, workers need to fix the connecting pipe 3 to the fixed pipe 2, and then open the exhaust valve to discharge the exhaust gas into the fixed pipe 2. The fixed pipe 2 then transports the exhaust gas into the purification chamber 1. Once the exhaust gas enters the purification chamber 1, the exhaust fan 4 will start working, discharging the treated exhaust gas. During discharge, the electrostatic filter plate 9 will start working. The electrostatic filter plate 9 works by using an electric field to polarize neutral dust particles through charged bodies, capturing them using the attraction between opposite charges. This generates static electricity in the electrostatic filter plate 9, adsorbing dust particles in the exhaust gas and improving the equipment's purification efficiency. Simultaneously, when the equipment is being repaired or replaced, both mounting shells 13 can be pressed down. The mounting shells 13 will cause the telescopic ends of the elastic telescopic rod 12 to retract, thereby causing the mounting shells 13 to contract. The mounting shell 13 drives the pressure cylinder 14 to retract, thereby releasing the restriction on the fixed plate 8. At this time, the handle is pulled to remove the electrostatic filter plate 9 from the inside of the purification box 1 for maintenance and replacement. After replacement, the electrostatic filter plate 9 is inserted into the inside of the purification box 1. At this time, the electrostatic filter plate 9 drives the fixed plate 8 to move, and the fixed plate 8 drives the trapezoidal plate 10 to move. The trapezoidal plate 10 contacts the pressure cylinder 14 through the rear inclined surface, thereby driving the pressure cylinder 14 to move. When the fixed plate 8 enters the inside of the pressure cylinder 14, the extension end of the elastic telescopic rod 12 will drive the pressure cylinder 14 to reset, thereby limiting the fixed plate 8. This realizes quick disassembly and assembly for equipment maintenance, making the replacement and maintenance of the electrostatic filter plate 9 more convenient, reducing equipment downtime, improving overall operating efficiency, and not only improving maintenance efficiency and safety, but also reducing maintenance costs and extending equipment life. A vacuum pump 15 is fixedly connected to the top of the purification box 1, and the output end of the vacuum pump 15 is fixedly connected to the vacuum pump 15. The inner wall of the purification box 1 is provided with an ultrasonic vibration mechanism 6 for ultrasonic vibration cleaning. The circumferential surface of the fixed pipe 2 is provided with a leak-proof mechanism 7 for preventing leakage. The exhaust fan 4 is used to discharge the purified exhaust gas. The recovery shell 5 is used to recover the filtered dust. The electrostatic filter plate 9 is used to use electrostatic adsorption to filter the dust. The rear side of the fixed plate 8 is in contact with the front side of the purification box 1. The circumferential surface of the pressure cylinder 14 is in contact with the front side of the fixed plate 8, and the fixed plate 8 moves on the movement trajectory of the pressure cylinder 14. The vacuum pump 15 is used to extract the hot air inside the purification box 1. The side of the residual heat recovery pipe 16 away from the vacuum pump 15 is fixedly connected to the inner wall of the purification box 1, and the residual heat recovery pipe 16 is used to recycle the residual heat. When filtering exhaust gas, a dry environment is required for electrostatic adsorption. The exhaust gas emits heat at approximately 140 degrees Celsius. To maintain a dry internal environment, the vacuum pump 15 can be activated. The vacuum pump 15 drives the residual heat recovery pipe 16 through its output end to process the hot air inside the purification chamber 1. The extracted hot air returns to the purification chamber 1 through the residual heat recovery pipe 16, thus ensuring that the purification chamber 1 remains in a high-temperature and dry state. The electrostatic filter plate 9, when energized, can charge impurities in the air, thereby effectively adsorbing pollutants. The hot air circulation keeps the electrostatic plate dry, preventing a decrease in adsorption efficiency due to moisture, thereby improving the overall purification efficiency and further reducing the equipment maintenance cost.

[0018] Working principle: When treating exhaust gas from thermal power plants, the electrostatic filter plate 9 is activated, causing charged particles to pass through an electric field and polarize neutral dust, thereby adsorbing dust particles in the exhaust gas and improving the equipment's purification efficiency. Simultaneously, when the equipment is being repaired or replaced, pressing down on the two mounting shells 13 releases the restriction on the fixing plate 8, enabling rapid disassembly and assembly for maintenance. This not only improves maintenance efficiency and safety but also reduces maintenance costs and extends equipment lifespan. When filtering exhaust gas, the suction pump 15 drives the residual heat recovery pipe 16 to circulate the hot air inside the purification chamber 1, ensuring the chamber remains in a high-temperature, dry state. The electrostatic filter plate 9, when energized, charges impurities in the air, effectively adsorbing pollutants. The hot air circulation keeps the electrostatic plate dry, further reducing equipment maintenance costs.

[0019] Please see Figures 1-7Based on the above embodiments, in another embodiment of the present invention, the ultrasonic vibration mechanism 6 includes a threaded rod 62, a gear 63 is fixedly connected to the bottom of the threaded rod 62, a scraper 64 is threadedly connected to the circumferential surface of the threaded rod 62, a limit rod 65 is fixedly connected to the inner wall of the purification box 1, and a rack 61 is fixedly connected to the inner wall of the electrostatic filter plate 9. While the electrostatic filter plate 9 is being removed and cleaned, the movement of the electrostatic filter plate 9 drives the rack 61 to move. The rack 61 meshes with the circumferential surface of the gear 63, thereby driving the gear 63 to rotate. The gear 63 drives the threaded rod 62 to rotate. The rotation of the threaded rod 62 will contact the inner wall of the scraper 64 through the threaded groove on the circumferential surface, thereby causing the scraper 64 to move upward and scrape off the dust adsorbed on the outer surface of the electrostatic filter plate 9. After maintenance is completed, the electrostatic filter plate 9 is inserted back into the purification box 1. At this time, the rack 61 drives the gear 63 to rotate in the opposite direction, thereby driving the scraper 64 to move downward and reset. This further saves the maintenance time and cost for the staff, and can more effectively remove accumulated pollutants and reduce the decrease in filtration efficiency caused by dust blockage. The limit rod 65 limits the scraper 64 to prevent the scraper 64 from deviating during operation. A rotating rod 66 is rotatably connected to the inner wall of the purification box 1. A connecting frame 67 is fixedly connected to the circumferential surface of the rotating rod 66. An ultrasonic device 68 is fixedly connected to both sides of the connecting frame 67. The circumferential surface of the threaded rod 62 is rotatably connected to the inner wall of the purification box 1. The side of the rack 61 away from the electrostatic filter plate 9 meshes with the circumferential surface of the gear 63. The inner wall of the scraper 64 contacts the circumferential surface of the limiting rod 65, and the limiting rod 65 is used to limit the scraper 64. The scraper 64 contacts both sides of the electrostatic filter plate 9, and the scraper 64 is used to scrape off the dust on the outer surface of the electrostatic filter plate 9. A motor is fixedly connected to the front side of the purification box 1, and the output end of the motor is fixedly connected to the front end of the rotating rod 66. The ultrasonic device 68 is used to emit ultrasonic waves to make the electrostatic filter plate 9 vibrate. While filtration is in progress, the motor on the front of the purification chamber 1 is started. The motor drives the rotating rod 66 to rotate via its output end. The rotating rod 66 drives the connecting frame 67 to rotate, and the connecting frame 67 drives the ultrasonic device 68 to rotate. At the same time, the ultrasonic device 68 is activated and emits ultrasonic waves, causing the interior of the purification chamber 1 to rotate slightly. Simultaneously, the electrostatic filter plate 9 also begins to vibrate, shaking the dust particles on its outer surface into the inside of the recovery shell 5. The ultrasonic vibration can remove dust from the surface of the electrostatic filter plate 9, thereby maintaining the efficient operation and filtration effect of the electrostatic filter plate 9. At the same time, the ultrasonic waves can cause particulate matter in the exhaust gas to agglomerate and settle, improving the purification effect and further enhancing the stability of the equipment during purification.

[0020] Working principle: While the electrostatic filter plate 9 is being removed and cleaned, the scraper 64 moves upward to remove dust adsorbed on the outer surface of the electrostatic filter plate 9, which can more effectively remove accumulated pollutants and reduce the decrease in filtration efficiency caused by dust blockage. During filtration, the motor is started and drives the rotating rod 66 to rotate through the output end. The rotating rod 66 drives the ultrasonic device 68 to rotate and emit ultrasonic waves, which makes the electrostatic filter plate 9 vibrate. This shakes the dust particles on the outer surface into the inside of the recovery shell 5. The ultrasonic vibration can remove the dust on the surface of the electrostatic filter plate 9. At the same time, the ultrasonic waves can cause the particulate matter in the exhaust gas to agglomerate and settle, improving the purification effect.

[0021] The leak prevention mechanism 7 includes a telescopic slide rod 71, with a flip plate 72 hinged to the bottom of the telescopic slide rod 71, and a limit post 73 fixedly connected to the inner wall of the recovery shell 5. While the equipment is being cleaned, the electrostatic filter plate 9 is pulled out for cleaning. At this time, the scraper 64 moves upward. The upward movement of the scraper 64 will drive the telescopic slide rod 71 to move upward through the hinge point. The upward movement of the telescopic slide rod 71 will drive the flipping plate 72 to rotate through the hinge point. The rotation of the flipping plate 72 will open the ash outlet of the recovery shell 5, thereby allowing the dust to be discharged and recovered. The automatic opening of the ash outlet can reduce the time and effort of manual operation, improve maintenance efficiency, improve purification efficiency, reduce the workload of workers, and improve the hygiene of the indoor environment. The limiting column 73 will limit the flipping plate 72 to prevent the flipping plate 72 from rotating excessively. A long rod 74 is fixedly connected to the circumferential surface of the fixed tube 2. A sealing ring 75 is slidably connected to the circumferential surface of the long rod 74 via a tension spring. An L-shaped rod 76 is fixedly connected to the circumferential surface of the limiting post 73. A pulley 77 is installed on the inner wall of the L-shaped rod 76. The bottom of the scraper 64 is hinged to the top of the telescopic slide rod 71. The flipping plate 72 is rotatably connected to the inner wall of the recovery shell 5. The limiting post 73 is used to limit the flipping plate 72. The circumferential surface of the pulley 77 is in contact with the circumferential surface of the sealing ring 75.

[0022] A method for using a flue gas purification device for a thermal power plant includes the following steps: Step 1: When the thermal power plant is working, it will produce a large amount of exhaust gas. At this time, the staff needs to fix the connecting pipe 3 to the fixed pipe 2, and then open the exhaust valve to discharge the exhaust gas into the fixed pipe 2. The fixed pipe 2 will transport the exhaust gas into the interior of the purification box 1. Step 2: When the exhaust gas enters the purification box 1, the exhaust fan 4 will be started to work. The exhaust fan 4 will discharge the treated exhaust gas. When it is discharged, the electrostatic filter plate 9 will be started to work. The electrostatic filter plate 9 will use the electric field to polarize neutral dust through charged bodies and capture it by the attraction of opposite charges. Thus, the electrostatic filter plate 9 will generate static electricity to adsorb dust particles in the exhaust gas. Step 3: At the same time, when the equipment is being repaired or replaced, you can press the two other mounting shells 13 simultaneously. The mounting shells 13 will cause the telescopic ends of the elastic telescopic rods 12 to retract, thereby causing the mounting shells 13 to retract. The mounting shells 13 will cause the pressure cylinder 14 to retract, thereby releasing the limit on the fixed plate 8. At this time, pull the handle to pull the electrostatic filter plate 9 out of the purification box 1 for repair or replacement. Step 4: After replacement, insert the electrostatic filter plate 9 into the purification box 1. At this time, the electrostatic filter plate 9 drives the fixed plate 8 to move, and the fixed plate 8 drives the trapezoidal plate 10 to move. The trapezoidal plate 10 contacts the pressure cylinder 14 through the rear inclined surface, thereby driving the pressure cylinder 14 to move. When the fixed plate 8 enters the pressure cylinder 14, it will drive the pressure cylinder 14 to reset through the telescopic end of the elastic telescopic rod 12, thereby limiting the fixed plate 8 and realizing the quick disassembly and assembly of equipment maintenance. During exhaust gas treatment, leakage may occur at the connection point. When the connecting pipe 3 moves to connect to the fixed pipe 2, the L-shaped rod 76 can be moved by the connecting pipe 3. The movement of the L-shaped rod 76 moves the pulley 77. The pulley 77 will contact the circumferential surface of the sealing ring 75 through its circumferential surface, thereby causing the sealing ring 75 to move downward. This seals the junction of the fixed pipe 2 and the connecting pipe 3 through the sealing point of the sealing ring 75. When the connecting pipe 3 moves away, the pulley 77 will move away and release the sealing effect at the junction of the fixed pipe 2 and the connecting pipe 3 through the tension spring between it and the long rod 74. This prevents the leakage of harmful gases and dust, reduces the threat to the health of operators, and lowers the risk of safety accidents such as fires. It can also improve the corrosion resistance and sealing performance of the exhaust hood, thereby eliminating potential safety hazards.

[0023] Working principle: While the equipment is cleaning, the scraper 64 drives the tilting plate 72 to rotate, which opens the ash outlet of the recycling shell 5, allowing the dust to be discharged and recycled. The automatic opening of the ash outlet can reduce the time and effort of manual operation and improve maintenance efficiency. When treating exhaust gas, exhaust gas leakage may occur at the connection. The L-shaped rod 76 is moved by the connecting pipe 3. The L-shaped rod 76 drives the sealing ring 75 to seal the junction of the fixed pipe 2 and the connecting pipe 3, preventing the leakage of harmful gases and dust, reducing the threat to the health of operators, and reducing the risk of safety accidents such as fire.

[0024] This invention provides a waste gas purification device and method for thermal power plants. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention. All components not explicitly stated in this embodiment can be implemented using existing technologies.

Claims

1. A tail gas purification device for thermal power plants, comprising a purification box (1), characterized in that: A fixed pipe (2) is fixedly connected to the left side of the purification box (1), and a connecting pipe (3) is installed on the left side of the fixed pipe (2). A recycling shell (5) is fixedly connected to the bottom of the purification box (1). An exhaust fan (4) is fixedly connected to the inner wall of the purification box (1). An electrostatic filter plate (9) is slidably connected to the inner wall of the purification box (1). A fixed plate (8) is fixedly connected to the front side of the electrostatic filter plate (9). Trapezoidal plates (10) are fixedly connected to both sides of the fixed plate (8). A connecting plate (11) is fixedly connected to the front side of the purification box (1). An elastic telescopic rod (12) is fixedly connected to the side of the connecting plate (11) near the fixed plate (8). An installation shell (13) is fixedly connected to the telescopic end of the elastic telescopic rod (12). A pressure cylinder (14) is rotatably connected to the inner wall of the installation shell (13). An air pump (15) is fixedly connected to the top of the purification box (1). An air pump (15) is fixedly connected to the output end of the air pump (15).

2. The exhaust gas purification device for thermal power plants according to claim 1, characterized in that: The inner wall of the purification box (1) is provided with an ultrasonic vibration mechanism (6) for vibrating cleaning using ultrasonic waves, and the circumferential surface of the fixed tube (2) is provided with a leak-proof mechanism (7) for preventing leakage.

3. The exhaust gas purification device for thermal power plants according to claim 2, characterized in that: The exhaust fan (4) is used to discharge the purified exhaust gas, the recovery shell (5) is used to recover the filtered dust, the electrostatic filter plate (9) is used to use electrostatic adsorption to filter the dust, the rear side of the fixed plate (8) is in contact with the front side of the purification box (1), the circumferential surface of the pressure cylinder (14) is in contact with the front side of the fixed plate (8), and the fixed plate (8) moves on the movement trajectory of the pressure cylinder (14), the air pump (15) is used to extract the hot air inside the purification box (1), the side of the residual heat recovery pipe (16) away from the air pump (15) is fixedly connected to the inner wall of the purification box (1), and the residual heat recovery pipe (16) is used to recycle the residual heat.

4. The exhaust gas purification device for thermal power plants according to claim 3, characterized in that: The ultrasonic vibration mechanism (6) includes a threaded rod (62), a gear (63) is fixedly connected to the bottom of the threaded rod (62), a scraper (64) is threadedly connected to the circumferential surface of the threaded rod (62), a limit rod (65) is fixedly connected to the inner wall of the purification box (1), and a rack (61) is fixedly connected to the inner wall of the electrostatic filter plate (9).

5. The exhaust gas purification device for thermal power plants according to claim 4, characterized in that: The inner wall of the purification box (1) is rotatably connected to a rotating rod (66), and a connecting frame (67) is fixedly connected to the circumferential surface of the rotating rod (66). Ultrasonic devices (68) are fixedly connected to both sides of the connecting frame (67).

6. The exhaust gas purification device for thermal power plants according to claim 5, characterized in that: The circumferential surface of the threaded rod (62) is rotatably connected to the inner wall of the purification box (1). The side of the rack (61) away from the electrostatic filter plate (9) meshes with the circumferential surface of the gear (63). The inner wall of the scraper (64) contacts the circumferential surface of the limiting rod (65), and the limiting rod (65) is used to limit the scraper (64). The scraper (64) contacts both sides of the electrostatic filter plate (9), and the scraper (64) is used to scrape off the dust on the outer surface of the electrostatic filter plate (9). A motor is fixedly connected to the front side of the purification box (1), and the output end of the motor is fixedly connected to the front end of the rotating rod (66). The ultrasonic device (68) is used to emit ultrasonic waves to make the electrostatic filter plate (9) vibrate.

7. The exhaust gas purification device for thermal power plants according to claim 6, characterized in that: The leak prevention mechanism (7) includes a telescopic slide rod (71), the bottom of which is hinged to a flip plate (72), and the inner wall of the recovery shell (5) is fixedly connected to a limit post (73).

8. The exhaust gas purification device for thermal power plants according to claim 7, characterized in that: The circumferential surface of the fixed tube (2) is fixedly connected to a long rod (74), and the circumferential surface of the long rod (74) is slidably connected to a sealing ring (75) by a tension spring. The circumferential surface of the limiting post (73) is fixedly connected to an L-shaped rod (76), and a pulley (77) is installed on the inner wall of the L-shaped rod (76).

9. A tail gas purification device for thermal power plants according to claim 8, characterized in that: The bottom of the scraper (64) is hinged to the top of the telescopic slide bar (71), the flipping plate (72) is rotatably connected to the inner wall of the recycling shell (5), the limiting post (73) is used to limit the flipping plate (72), and the circumferential surface of the pulley (77) is in contact with the circumferential surface of the sealing ring (75).

10. A method of using a tail gas purification device for a thermal power plant, comprising the tail gas purification device for a thermal power plant as described in claim 9, characterized in that: Includes the following steps: Step 1: When the thermal power plant is working, a large amount of exhaust gas will be generated. At this time, the staff needs to fix the connecting pipe (3) to the fixed pipe (2), and then open the exhaust valve to discharge the exhaust gas into the fixed pipe (2). The fixed pipe (2) will transport the exhaust gas into the interior of the purification box (1). Step 2: When the exhaust gas enters the purification box (1), the exhaust fan (4) will be started to work. The exhaust fan (4) will discharge the treated exhaust gas. When it is discharged, the electrostatic filter plate (9) will be started to work. The electrostatic filter plate (9) will polarize neutral dust through the electric field by the charged body and capture it by the attraction of opposite charges. Thus, the electrostatic filter plate (9) will generate static electricity to adsorb the dust particles in the exhaust gas. Step 3: At the same time, when the equipment is being repaired or replaced, you can press the two other mounting shells (13) at the same time. The mounting shells (13) will cause the telescopic end of the elastic telescopic rod (12) to retract, thereby causing the mounting shells (13) to retract. The mounting shells (13) will cause the pressure cylinder (14) to retract, thereby releasing the limit on the fixed plate (8). At this time, pull the handle to pull the electrostatic filter plate (9) out of the purification box (1) for repair or replacement. Step 4: After replacement, insert the electrostatic filter plate (9) into the purification box (1). At this time, the electrostatic filter plate (9) drives the fixed plate (8) to move, and the fixed plate (8) drives the trapezoidal plate (10) to move. The trapezoidal plate (10) contacts the pressure cylinder (14) through the rear inclined surface, thereby driving the pressure cylinder (14) to move. When the fixed plate (8) enters the interior of the pressure cylinder (14), it will drive the pressure cylinder (14) to reset through the extension end of the elastic telescopic rod (12), thereby limiting the fixed plate (8) and realizing the quick disassembly and assembly of equipment maintenance.

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