Wet desulphurization device with automatic filter screen flushing function

Abstract

The utility model discloses a wet desulphurization device with an automatic filter screen flushing function, and belongs to the technical field of wet desulphurization devices. Comprising a tower body, a filtering device, a smoke inlet pipe, a spraying device, a reaction auxiliary device, an annular sweeping device, a demister and an oxygen conveying pipe, gas on the surface of a reaction tank is absorbed and injected into the reaction tank through the reaction auxiliary device, and a gas phase and a liquid phase in the reaction tank are stirred to be mixed more uniformly; gypsum at the bottom of the reaction tank is disturbed by the reaction auxiliary device, so that the gypsum is prevented from being attached to the bottom of the tower body, and gypsum slurry is uniformly discharged and is not easy to block; the drum rotates to sweep the inner wall of the tower body through the annular sweeping device, and gypsum is prevented from being attached to the inner wall of the tower body; by utilizing the rotary filter screen in the filter device, solid particles are not easy to attach to the surface of the rotary filter screen, the cleaning frequency of the filter screen is reduced, the filter screen is automatically flushed under the condition that the slurry circulating pump is not closed, and the filtered solid particles are recycled into the tower body.

Description

Technical Field

[0001] The utility model relates to the technical field of wet desulfurization devices, in particular to a wet desulfurization device with an automatic filter screen flushing function. Background Art

[0002] Limestone wet flue gas desulfurization technology uses a slurry circulation pump to pump the slurry in the absorption tower into the spray layer, so that the slurry is in uniform contact with the flue gas, SO2 in the flue gas is removed, and flue gas desulfurization is achieved. Among them, the slurry pool at the bottom of the absorption tower needs to be continuously replenished with water and slurry when the absorption tower is working, and the replenished water and slurry are often mixed with impurities. The inner wall of the reaction tower will also adhere to some reactants due to long-term operation. These reactants will fall off and be involved in the slurry circulation pump together with impurities, and then be pumped into the spray layer through the slurry circulation pump, blocking the nozzle. For this reason, technicians usually add a filter before the slurry enters the circulation pump.

[0003] While the technicians in this field are committed to developing filter screens, they often ignore the cleaning of filter screens after they are clogged. The conventional design is to set a filter screen at the pipe mouth inside the absorption tower. When one of the pumps is clogged, the entire unit needs to be shut down to clean the filter screen, resulting in a decrease in desulfurization efficiency. Utility Model Content

[0004] The utility model aims to provide a wet desulfurization device with an automatic filter screen flushing function to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a wet flue gas desulfurization device with automatic filter screen flushing function, including a demister, an oxygen supply pipe, a smoke inlet pipe, a spray device and a tower body, a filter device is installed on the side wall of the tower body, a ring sweep device is installed inside the tower body, a reaction auxiliary device is installed on the ring sweep device, the demister and the spray device are both installed inside the tower body, the oxygen supply pipe and the smoke inlet pipe are connected to the inside of the tower body, the filter device is used to filter and clean the reactants and return the reactants to the tower body, the ring sweep device is used to prevent the reactants from adhering to the tower wall, and the reaction auxiliary device is used to disturb the airflow in the tower, stir the reactants and mix the gas phase and the liquid phase evenly. A control system is installed in the wet flue gas desulfurization device, and the control system is used to control the entire wet flue gas desulfurization device, and a reaction pool is provided at the bottom of the tower body.

[0006] The flue gas enters the tower body through the smoke inlet pipe, and comes into contact with the lime slurry sprayed by the spray device. The sulfur dioxide in the flue gas reacts with the lime slurry and falls into the reaction pool at the bottom of the tower body. At the same time, oxygen enters the reaction pool through the oxygen supply pipe and further reacts with the reactants falling into the reaction pool, and finally crystallizes to form gypsum, which will be deposited at the bottom of the reaction pool due to its own weight.

[0007] The filtering device includes a filtering pipe and a circulating pipe. One end of the filtering pipe is internally connected to the tower body through the circulating pipe. The other end of the filtering pipe is connected to a slurry circulating pump through the circulating pipe. A first bearing is installed inside the filtering pipe, and a rotating filter screen is rotatably installed on the first bearing. A flushing nozzle is installed at the top of the filtering pipe. Pressure gauges are installed at the top of the circulating pipes at both ends of the filtering pipe. The bottom end of the filtering pipe is internally connected to the tower body through a return pipe.

[0008] The flushing nozzle is located on one side of the central axis of the filtering pipe. The connection between the return pipe and the tower body is located below the jet slurry. The connection between the circulating pipe and the tower body is located between the circumferential sweeping device and the jet slurry.

[0009] The rotating filter screen includes a main filter screen. A number of filter screen rotating vanes are installed on the side of the main filter screen. A flange is installed on the outer edge of the larger diameter side of the main filter screen, and the flange is rotatably connected to the first bearing. A bottom rotating vane and a filter screen bottom sheet are installed on the inner edge of the smaller diameter side of the main filter screen. An electric valve is installed inside the return pipe.

[0010] The slurry inside the tower body enters the filtering pipe through the circulating pipe. The slurry is accelerated by the action of the slurry circulating pump and flows through the filtering pipe. When flowing through the filtering pipe, it impacts the filter screen rotating vanes and the bottom rotating vanes. The filter screen rotating vanes and the bottom rotating vanes drive the main filter screen to rotate on the first bearing. At the same time, the gypsum and other solid particles mixed in the slurry are blocked by the main filter screen, the filter screen rotating vanes and the filter screen bottom sheet. The blocked gypsum and other solid particles are continuously dispersed and suspended in the chamber formed by the filtering pipe by the filter screen rotating vanes, so that the surfaces of the main filter screen and the filter screen bottom sheet are not attached by the gypsum and other solid particles, which affects the slurry discharge. When the gypsum and other solid particles in the chamber of the filtering pipe accumulate too much and affect the slurry discharge, the control system receives the pressure difference feedback by the pressure gauges on both sides of the filtering pipe. When the pressure difference is too large, the control system opens the electric valve on the return pipe and turns on the flushing nozzle on the filtering pipe. The flushing nozzle flushes the main filter screen, the filter screen rotating vanes and the filter screen bottom sheet. The water of the flushing nozzle washes on the filter screen rotating vanes and drives the filter screen rotating vanes to continue rotating. The slurry mixed with the gypsum and other solid particles flows into the tower body from the return pipe. Under the action of the slurry circulating pump, a part of the slurry impacts on the rotating filter screen and flows into the slurry circulating pump, thereby further driving the rotating filter screen to rotate. Another part of the slurry washes the rotating filter screen under the action of gravity and then flows into the tower body from the return pipe. When the rotating filter screen is washed by the slurry, the control system closes the electric valve and the flushing nozzle, so as to realize the flushing of the filter screen without shutting down the slurry circulating pump, and recycle the filtered gypsum and other solid particles into the tower body.

[0011] The circumferential sweeping device includes a circumferential moving device and a motor. The circumferential moving device is installed inside the tower body. A reaction assisting device is installed on the circumferential moving device. A cleaning roller is rotatably installed on the circumferential moving device. The motor is installed on the tower body. The output shaft of the motor penetrates the tower body and is installed with a bevel gear. The bevel gear is meshed with the circumferential moving device for transmission.

[0012] The control system starts the motor. The output shaft of the motor drives the bevel gear to rotate. The bevel gear drives the bevel gear ring to rotate. The bevel gear ring drives the reaction auxiliary device to rotate through the fixed ring, causing the reaction auxiliary device to rotate along the inner wall of the tower, so that the entire inner wall of the tower can be affected by the reaction auxiliary device. When the fixed ring rotates, it drives the cleaning roller to rotate through the fixed frame at the bottom. The transmission gear on the cleaning roller meshes with the internal gear ring for transmission, so that the roller rotates to clean the inner wall of the tower and prevent gypsum from adhering to the inner wall of the tower.

[0013] The ring drive device includes a fourth bearing and an internal gear ring. Both the fourth bearing and the internal gear ring are installed inside the tower. A bevel gear ring is rotatably installed inside the fourth bearing. A fixed ring is installed inside the bevel gear ring. A fixed frame is installed at the top of the fixed ring. A reaction auxiliary device is installed on the internal gear ring. A cleaning roller is rotatably installed on the fixed frame. The bevel gear ring meshes with the bevel gear for transmission.

[0014] The cleaning roller includes a roller and a rotating rod. The roller is rotatably connected to the fixed ring through the rotating rod. A transmission gear is concentrically installed on the rotating rod. The transmission gear meshes with the internal gear ring for transmission.

[0015] The reaction auxiliary device includes an air pump seat. The air pump seat is installed on the fixed ring. An air extraction pump is installed inside the air pump seat. An air intake turbulence fan is movably installed at the top of the air pump seat through a third bearing. A hollow connecting rod is installed at the bottom of the air pump seat. One end of the air extraction pump is connected to an air intake funnel pipe, and the other end of the air extraction pump is movably connected to an air outlet funnel pipe. The air intake funnel pipe is located inside the air intake turbulence fan, and the air outlet funnel pipe is located inside the hollow connecting rod. The bottom end of the hollow connecting rod is rotatably installed with a jet slurry through a second bearing. The bottom end of the jet slurry is installed with a bottom scraping slurry through a connecting rod.

[0016] The air intake turbulence fan includes a hollow fan shaft. An air suction hood is installed at the top of the hollow fan shaft. A number of air suction fan blades are installed between the hollow fan shaft and the air suction hood. A number of turbulence fan blades are installed at the top of the air suction hood. The hollow fan shaft is rotatably connected to the air pump seat through a third bearing. The air intake funnel pipe is located inside the hollow fan shaft.

[0017] The control system turns on the air extraction pump. The air extraction pump sucks air through the air intake funnel pipe, creating a negative pressure inside the hollow fan shaft and the air suction hood, so that the gas below the air suction hood is sucked in. Since some unreacted oxygen in the reaction tank will float out of the reaction tank, and some unabsorbed sulfur dioxide in the flue gas will also move to the bottom of the absorption hood along with the airflow in the tower, most of the sucked gas is oxygen, and a small part is flue gas and air. When the gas is sucked into the air suction hood, the airflow drives the air suction fan blades to rotate. The air suction fan blades rotate and drive the hollow fan shaft and the air suction hood to rotate. The air suction hood drives the turbulence blades to rotate. The rotation of the turbulence blades generates an upward airflow. Since the flue gas enters from one side of the tower, the flue gas will be scattered after being disturbed by the airflow, so that the flue gas can react more evenly with the lime slurry aerosol.

[0018] The jet slurry includes a jet shaft. The top end of the jet shaft is rotatably connected to the bottom end of a hollow connecting rod through a second bearing. A number of hollow blades are installed on the outer side of the jet shaft. The hollow blades are communicated with the inside of the jet shaft. A number of jet nozzles are installed on the hollow blades. The jet nozzles are communicated with the inside of the hollow blades. The bottom end of the jet shaft is installed with a bottom scraping slurry through a connecting rod.

[0019] The inhaled gas enters the intake funnel pipe from the hollow part of the hollow fan shaft, then enters the outlet funnel pipe through an air extraction pump. The high-pressure gas flowing out of the outlet funnel pipe enters the hollow chamber inside the jet shaft, then enters the hollow blades from the hollow chamber, and finally sprays out from the jet nozzles on the hollow blades. The sprayed high-pressure gas pushes the hollow blades in the opposite direction, causing the hollow blades to rotate.

[0020] The sprayed gas passes through the jet nozzles on the hollow fan blades and is evenly discharged. After the gas enters the reaction tank, uniform bubbles will be formed for reaction. The oxygen delivery pipe is located at the bottom of the jet slurry. While the hollow blades rotate to stir the lime slurry, the oxygen input by the oxygen delivery pipe is also evenly stirred, making the oxygen disperse more evenly for reaction.

[0021] The bottom scraping fan includes a bottom scraping shaft. The bottom scraping shaft is connected to the bottom end of the jet shaft through a connecting rod. A number of bottom scraping blades are installed on the bottom scraping shaft. A bottom scraping plate is installed on the bottom scraping blades.

[0022] The bottom scraping plate is vertically installed on the bottom scraping blades. The rotation of the hollow blades drives the rotation of the jet shaft. The jet shaft drives the rotation of the bottom scraping blades on the bottom scraping shaft through a connecting rod. The bottom scraping plate on the bottom scraping blades rotates and scrapes the gypsum deposited at the bottom of the tower body, preventing the gypsum from adhering to the bottom of the tower body, and making the gypsum mix with the slurry so that the gypsum is evenly discharged.

[0023] Compared with the prior art, the beneficial effects achieved by the present utility model are as follows: The present utility model uses a reaction auxiliary device to absorb and inject the unreacted oxygen and sulfur dioxide-containing flue gas on the surface of the reaction tank into the reaction tank, accelerating the desulfurization reaction, and stirring the gas phase and liquid phase in the reaction tank through the reaction auxiliary device to make them mix more evenly, improving the desulfurization efficiency. At the same time, using the reaction auxiliary device to disturb the gypsum at the bottom of the reaction tank not only prevents the gypsum from adhering to the bottom of the tower body, but also makes the gypsum slurry more evenly discharged when it is discharged, and is not easy to block; using the circumferential sweeping device to make the reaction auxiliary device rotate along the inner wall of the tower body, so that the entire inner wall of the tower body can be affected by the reaction auxiliary device, and making the roller rotate to clean the inner wall of the tower body to prevent the gypsum from adhering to the inner wall of the tower body; using the rotating filter screen in the filtering device to make it difficult for gypsum and other solid particles to adhere to the surface of the rotating filter screen, reducing the number of times of filter screen cleaning, realizing automatic flushing of the filter screen without shutting down the slurry circulation pump, and recycling the filtered gypsum and other solid particles back into the tower body. Description of the Drawings

[0024] The accompanying drawings are used to provide a further understanding of the present utility model and form a part of the description. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the accompanying drawings:

[0025] Figure 1 is the overall elevation view of the wet desulfurization device of the present utility model;

[0026] Figure 2 is the sectional view of the wet desulfurization device of the present utility model;

[0027] Figure 3 is the sectional elevation view of the wet desulfurization device of the present utility model;

[0028] Figure 4 is the sectional view of the filtration device of the present utility model;

[0029] Figure 5 is the elevation view of the rotary filter screen of the present utility model;

[0030] Figure 6 is the elevation view of the reaction auxiliary device of the present utility model;

[0031] Figure 7 is the developed view of the main filter screen of the present utility model;

[0032] Figure 8 is the sectional view of the reaction auxiliary device of the present utility model;

[0033] Figure 9 is the elevation view of the intake air turbulence fan of the present utility model;

[0034] Figure 10 is the elevation view of the hollow blade and the scraping bottom blade of the present utility model;

[0035] Figure 11 is the elevation view of the ring sweeping device of the present utility model;

[0036] Figure 12 is the exploded view of the ring driving device of the present utility model;

[0037] Figure 13 is the elevation view of the cleaning roller of the present utility model;

[0038] In the figure: 1. Tower body; 2. Filter device; 3. Smoke inlet pipe; 4. Spraying device; 5. Reaction assisting device; 6. Ring sweeping device; 7. Demister; 8. Oxygen delivery pipe; 21. Return pipe; 22. Filter pipe; 23. Rotating filter screen; 24. First bearing; 25. Pressure measuring instrument; 26. Flushing nozzle; 27. Circulation pipe; 231. Main filter screen; 232. Filter screen rotating piece; 233. Flanging; 234. Filter screen bottom sheet; 235. Bottom rotating piece; 51. Air pump seat; 52. Hollow connecting rod; 53. Jet slurry; 54. Bottom scraping slurry; 55. Inlet air spoiler fan; 56. Air extraction pump; 57. Inlet air funnel pipe; 58. Outlet air funnel pipe; 59. Second bearing; 510. Third bearing; 551. Spoiler fan blade; 552. Suction hood; 553. Suction fan; 554. Hollow fan shaft; 531. Hollow blade; 532. Jet head; 533. Jet shaft; 541. Bottom scraping blade; 542. Bottom scraping plate; 543. Bottom scraping shaft; 61. Cleaning roller; 62. Motor; 63. Ring driving device; 64. Bevel gear; 631. Fixed ring; 632. Bevel gear ring; 633. Fourth bearing; 634. Internal gear ring; 635. Fixed frame; 611. Driving gear; 612. Drum; 613. Rotating rod. Detailed implementation mode

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] Please refer to Figures 1-13 , the present invention provides a technical solution: a wet desulfurization device with an automatic filter screen flushing function, including a demister 7, an oxygen delivery pipe 8, a smoke inlet pipe 3, a spraying device 4 and a tower body 1. A filter device 2 is installed on the side wall of the tower body 1, a ring sweeping device 6 is installed inside the tower body 1, a reaction assisting device 5 is installed on the ring sweeping device 6, the demister 7 and the spraying device 4 are both installed inside the tower body 1, the oxygen delivery pipe 8 and the smoke inlet pipe 3 are communicated with the inside of the tower body 1, the filter device 2 is used for filtering and cleaning reactants and returning the reactants to the tower body 1, the ring sweeping device 6 is used to prevent reactants from adhering to the tower wall, and the reaction assisting device 5 is used to disturb the airflow in the tower, stir the reactants and make the gas phase and liquid phase mix evenly. A control system is installed inside the wet desulfurization device, and the control system is used to control the entire wet desulfurization device. A reaction pool is provided at the bottom of the tower body 1.

[0041] The flue gas enters the tower body 1 through the flue gas inlet pipe 3. The flue gas moves upward and contacts the lime slurry sprayed by the spraying device 4. Sulfur dioxide in the flue gas reacts with the lime slurry and falls into the reaction pool at the bottom of the tower body 1. At the same time, oxygen enters the reaction pool through the oxygen delivery pipe 8 and further reacts with the reactants falling into the reaction pool, and finally gypsum is crystallized. The gypsum will deposit at the bottom of the reaction pool due to its own weight.

[0042] The circulating device 63 includes a fourth bearing 633 and an internal gear ring 634. Both the fourth bearing 633 and the internal gear ring 634 are installed in the tower body 1. A bevel gear ring 632 is rotatably installed inside the fourth bearing 633. A fixing ring 631 is installed inside the bevel gear ring 632. A fixing frame 635 is installed at the top of the fixing ring 631. A reaction assisting device 5 is installed on the internal gear ring 634. A cleaning roller 61 is rotatably installed on the fixing frame 635. The bevel gear ring 632 is in meshing transmission with the bevel gear 64.

[0043] The cleaning roller 61 includes a roller 612 and a rotating rod 613. The roller 612 is rotatably connected to the fixing ring 631 through the rotating rod 613. A transmission gear 611 is concentrically installed on the rotating rod 613. The transmission gear 611 is in meshing transmission with the internal gear ring 634.

[0044] The reaction assisting device 5 includes an air pump seat 51. The air pump seat 51 is installed on the fixing ring 631. An air extraction pump 56 is installed inside the air pump seat 51. An air intake turbulence fan 55 is rotatably installed at the top of the air pump seat 51 through a third bearing 510. A hollow connecting rod 52 is installed at the bottom of the air pump seat 51. One end of the air extraction pump 56 is connected to an air intake funnel pipe 57. The other end of the air extraction pump 56 is movably connected to an air outlet funnel pipe 58. The air intake funnel pipe 57 is located inside the air intake turbulence fan 55. The air outlet funnel pipe 58 is located inside the hollow connecting rod 52. A jet slurry 53 is rotatably installed at the bottom of the hollow connecting rod 52 through a second bearing 59. A bottom scraping slurry 54 is installed at the bottom of the jet slurry 53 through a connecting rod.

[0045] The air intake turbulence fan 55 includes a hollow fan shaft 554. An air suction hood 552 is installed at the top of the hollow fan shaft 554. A number of air suction fan blades 553 are installed between the hollow fan shaft 554 and the air suction hood 552. A number of turbulence fan blades 551 are installed at the top of the air suction hood 552. The hollow fan shaft 554 is rotatably connected to the air pump seat 51 through a third bearing 510. The air intake funnel pipe 57 is located inside the hollow fan shaft 554.

[0046] The control system activates the air extraction pump 56. The air extraction pump 56 inhales air through the intake funnel pipe 57, creating a negative pressure inside the hollow fan shaft 554 and the suction hood 552, thereby sucking in the gas below the suction hood 552. Since some unreacted oxygen in the reaction tank will float to the surface of the reaction tank, and some unabsorbed sulfur dioxide in the flue gas will also move with the airflow in the tower to the bottom of the absorption hood, most of the gas inhaled is oxygen, and a small part is flue gas and air. When the gas is inhaled into the suction hood 552, the airflow drives the suction fan 553 blades to rotate. The suction fan 553 blades rotate and drive the hollow fan shaft 554 and the suction hood 552 to rotate. The suction hood 552 drives the spoiler blades to rotate, and the rotating spoiler blades generate an upward airflow. Since the flue gas enters from one side of the tower body 1, the flue gas will be dispersed after being disturbed by the airflow, so that the flue gas can react more evenly with the lime slurry aerosol.

[0047] The jet slurry 53 includes a jet shaft 533. The top of the jet shaft 533 is rotatably connected to the bottom end of the hollow connecting rod 52 through a second bearing 59. A number of hollow blades 531 are installed on the outside of the jet shaft 533. The hollow blades 531 communicate with the inside of the jet shaft 533. A number of jet nozzles 532 are installed on the hollow blades 531. The jet nozzles 532 communicate with the inside of the hollow blades 531. The bottom end of the jet shaft 533 is installed with a bottom scraping slurry 54 through a connecting rod.

[0048] The inhaled gas enters the intake funnel pipe 57 from the hollow part of the hollow fan shaft 554, then enters the outlet funnel pipe 58 through the air extraction pump 56. The high-pressure gas flowing out of the outlet funnel pipe 58 enters the hollow chamber inside the jet shaft 533, then enters the hollow blades 531 from the hollow chamber, and finally sprays out from the jet nozzles 532 on the hollow blades 531. The sprayed high-pressure gas pushes the hollow blades 531 in the opposite direction, causing the hollow blades 531 to rotate.

[0049] The sprayed gas is evenly distributed and discharged through the jet nozzles 532 on the hollow fan blades. After the gas enters the reaction tank, it will form uniform bubbles for reaction. The oxygen delivery pipe 8 is located at the bottom of the jet slurry 53. While the hollow blades 531 rotate and stir the lime slurry, the oxygen input by the oxygen delivery pipe 8 is also stirred evenly, making the oxygen disperse more evenly for reaction.

[0050] The bottom scraping fan includes a bottom scraping shaft 543. The bottom scraping shaft 543 is connected to the bottom end of the jet shaft 533 through a connecting rod. A number of bottom scraping blades 541 are installed on the bottom scraping shaft 543. A bottom scraping plate 542 is installed on the bottom scraping blades 541.

[0051] The scraping bottom plate 542 is vertically installed on the scraping bottom blade 541. The hollow blade 531 rotates to drive the jet shaft 533 to rotate. The jet shaft 533 drives the scraping bottom blade 541 on the scraping bottom shaft 543 to rotate through a connecting rod. The scraping bottom plate 542 on the scraping bottom blade 541 rotates and scrapes the gypsum deposited at the bottom of the tower body 1, preventing the gypsum from adhering to the bottom of the tower body 1, mixing the gypsum with the slurry, and discharging the gypsum evenly.

[0052] The circumferential sweeping device 6 includes a circumferential moving device 63 and a motor 62. The circumferential moving device 63 is installed inside the tower body 1. A reaction assisting device 5 is installed on the circumferential moving device 63. A cleaning roller 61 is rotatably installed on the circumferential moving device 63. The motor 62 is installed on the tower body 1. The output shaft of the motor 62 penetrates the tower body 1 and is installed with a bevel gear 64. The bevel gear 64 is in meshing transmission with the circumferential moving device 63.

[0053] The control system starts the motor 62. The output shaft of the motor 62 drives the bevel gear 64 to rotate. The bevel gear 64 drives the bevel gear ring 632 to rotate. The bevel gear ring 632 drives the reaction assisting device 5 to rotate through the fixed ring 631, so that the reaction assisting device 5 rotates along the inner wall of the tower body 1, so that the entire inner wall of the tower body 1 can be acted on by the reaction assisting device 5. When the fixed ring 631 rotates, it drives the cleaning roller 61 to rotate through the fixed bracket 635 at the bottom. The transmission gear 611 on the cleaning roller 61 is in meshing transmission with the internal gear ring 634, so that the roller 612 rotates to clean the inner wall of the tower body 1, preventing the gypsum from adhering to the inner wall of the tower body 1.

[0054] The filtering device 2 includes a filtering pipe 22 and a circulating pipe 27. One end of the filtering pipe 22 is communicated with the inside of the tower body 1 through the circulating pipe 27. The other end of the filtering pipe 22 is connected with a slurry circulating pump through the circulating pipe 27. A first bearing 24 is installed inside the filtering pipe 22. A rotating filter screen 23 is rotatably installed on the first bearing 24. A flushing nozzle 26 is installed at the top of the filtering pipe 22. Pressure gauges 25 are installed at the tops of the circulating pipes 27 at both ends of the filtering pipe 22. The bottom end of the filtering pipe 22 is communicated with the inside of the tower body 1 through a return pipe 21.

[0055] The flushing nozzle 26 is located on one side of the central axis of the filtering pipe 22. The connection part of the return pipe 21 and the tower body 1 is located below the jet slurry 53. The connection part of the circulating pipe 27 and the tower body 1 is located between the circumferential sweeping device 6 and the jet slurry 53.

[0056] The rotating filter screen 23 includes a main filter screen 231. A number of filter screen rotating vanes 232 are installed on the side of the main filter screen 231. A flanging 233 is installed on the outer edge of the large diameter side of the main filter screen 231. The flanging 233 is rotatably connected with the first bearing 24. A bottom rotating vane 235 and a filter screen bottom sheet 234 are installed on the inner edge of the small diameter side of the main filter screen 231. An electric valve is installed inside the return pipe 21.

[0057] Working principle of the utility model: The flue gas enters the tower body 1 through the flue gas inlet pipe 3. The flue gas moves upward and contacts the lime slurry sprayed by the spraying device 4. Sulfur dioxide in the flue gas reacts with the lime slurry and falls into the reaction pool at the bottom of the tower body 1. At the same time, oxygen enters the reaction pool through the oxygen delivery pipe 8 and further reacts with the reactants falling into the reaction pool. Finally, gypsum is crystallized. The gypsum will deposit at the bottom of the reaction pool due to its own weight.

[0058] The control system turns on the air extraction pump 56. The air extraction pump 56 sucks air through the air inlet funnel pipe 57, creating a negative pressure inside the hollow fan shaft 554 and the air suction hood 552, so that the gas below the air suction hood 552 is sucked in. Since some unreacted oxygen in the reaction pool will float out of the reaction pool, and some unabsorbed sulfur dioxide in the flue gas will also move with the airflow in the tower to the bottom of the absorption hood, most of the sucked gas is oxygen, and a small part is flue gas and air. When the gas is sucked into the air suction hood 552, the airflow drives the suction fan 553 blades to rotate. The suction fan 553 blades rotate and drive the hollow fan shaft 554 and the air suction hood 552 to rotate. The air suction hood 552 drives the spoiler blades to rotate, and the spoiler blades rotate to generate an upward airflow. Since the flue gas enters from one side of the tower body 1, the flue gas will be scattered after being disturbed by the airflow, so that the flue gas can more evenly contact and react with the lime slurry mist.

[0059] The sucked gas enters the air inlet funnel pipe 57 from the hollow part of the hollow fan shaft 554, then enters the air outlet funnel pipe 58 through the air extraction pump 56. The high-pressure gas flowing out of the air outlet funnel pipe 58 enters the hollow chamber inside the jet shaft 533, then enters the hollow blade 531 from the hollow chamber, and finally sprays out from the jet head 532 on the hollow blade 531. The sprayed high-pressure gas pushes the hollow blade 531 in the opposite direction, causing the hollow blade 531 to rotate.

[0060] The scraping bottom plate 542 is vertically installed on the scraping bottom blade 541. The rotation of the hollow blade 531 drives the jet shaft 533 to rotate. The jet shaft 533 drives the scraping bottom blade 541 on the scraping bottom shaft 543 to rotate through the connecting rod. The scraping bottom plate 542 on the scraping bottom blade 541 rotates and scrapes the gypsum deposited at the bottom of the tower body 1, preventing the gypsum from adhering to the bottom of the tower body 1 and mixing the gypsum with the slurry so that the gypsum can be evenly discharged.

[0061] The control system starts the motor 62. The output shaft of the motor 62 drives the bevel gear 64 to rotate. The bevel gear 64 drives the bevel gear ring 632 to rotate. The bevel gear ring 632 drives the reaction auxiliary device 5 to rotate through the fixed ring 631, so that the reaction auxiliary device 5 rotates along the inner wall of the tower body 1, so that the entire inner wall of the tower body 1 can be affected by the reaction auxiliary device 5. When the fixed ring 631 rotates, it drives the cleaning roller 61 to rotate through the fixed frame 635 at the bottom. The transmission gear 611 on the cleaning roller 61 meshes with the internal gear ring 634 to drive the roller 612 to rotate and clean the inner wall of the tower body 1, preventing the gypsum from adhering to the inner wall of the tower body 1.

[0062] The slurry inside the tower body 1 enters the filter tube 22 through the circulation pipe 27. The slurry is accelerated by the action of the slurry circulation pump and flows through the filter tube 22. When flowing through the filter tube 22, it impacts the filter screen rotating vane 232 and the bottom rotating vane 235. The filter screen rotating vane 232 and the bottom rotating vane 235 drive the main filter screen 231 to rotate on the first bearing 24. At the same time, the gypsum and other solid particles mixed in the slurry are blocked by the main filter screen 231, the filter screen rotating vane 232 and the filter screen bottom plate 234. The blocked gypsum and other solid particles are continuously dispersed and suspended in the chamber formed by the filter tube 22 by the filter screen rotating vane 232, so that the surfaces of the main filter screen 231 and the filter screen bottom plate 234 are not attached by gypsum and other solid particles, which affects the slurry discharge. When the gypsum and other solid particles in the chamber of the filter tube 22 accumulate too much and affect the slurry discharge, the control system receives the pressure difference feedback from the pressure gauges 25 on both sides of the filter tube 22. When the pressure difference is too large, the control system opens the electric valve on the return pipe 21 and turns on the flushing nozzle 26 on the filter tube 22. The flushing nozzle 26 flushes the main filter screen 231, the filter screen rotating vane 232 and the filter screen bottom plate 234. The water from the flushing nozzle 26 flushes on the filter screen rotating vane 232 and drives the filter screen rotating vane 232 to continue rotating. The slurry mixed with gypsum and other solid particles flows into the tower body 1 from the return pipe 21. Under the action of the slurry circulation pump, a part of the slurry impacts on the rotating filter screen 23 and flows into the slurry circulation pump, thereby further driving the rotating filter screen 23 to rotate. Another part of the slurry scours the rotating filter screen 23 under the action of gravity and then flows into the tower body 1 from the return pipe 21. When the rotating filter screen 23 is scoured by the slurry, the control system closes the electric valve and the flushing nozzle 26, so as to realize the flushing of the filter screen without shutting down the slurry circulation pump, and recycle the filtered gypsum and other solid particles into the tower body 1.

[0063] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0064] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A wet desulfurization device with automatic filter screen flushing function, comprising a demister (7), an oxygen supply pipe (8), a smoke inlet pipe (3) and a spray device (4), characterized in that: The wet desulfurization device comprises a tower body (1), a filtering device (2) is installed on the side wall of the tower body (1), a circular sweeping device (6) is installed inside the tower body (1), a reaction auxiliary device (5) is installed on the circular sweeping device (6), the demister (7) and the spraying device (4) are both installed inside the tower body (1), the oxygen supply pipe (8) and the smoke inlet pipe (3) are connected to the inside of the tower body (1), the filtering device (2) is used to filter and clean the reactants and make the reactants flow back to the tower body (1), the circular sweeping device (6) is used to prevent the reactants from adhering to the tower wall, and the reaction auxiliary device (5) is used to disturb the airflow in the tower, stir the reactants, and mix the gas phase and the liquid phase evenly.

2. A wet desulfurization device with automatic filter screen flushing function according to claim 1, characterized in that: The filtering device (2) comprises a filtering tube (22) and a circulation tube (27); one end of the filtering tube (22) is connected to the interior of the tower body (1) through the circulation tube (27); the other end of the filtering tube (22) is connected to a slurry circulation pump through the circulation tube (27); a first bearing (24) is installed inside the filtering tube (22); a rotating filter screen (23) is rotatably installed on the first bearing (24); a flushing nozzle (26) is installed at the top end of the filtering tube (22); pressure measuring instruments (25) are installed at the top ends of the circulation tubes (27) at both ends of the filtering tube (22); and the bottom end of the filtering tube (22) is connected to the interior of the tower body (1) through a reflux tube (21).

3. A wet desulfurization device with automatic filter screen flushing function according to claim 2, characterized in that: The rotary filter screen (23) comprises a main filter screen (231), a plurality of filter screen rotors (232) are mounted on the side of the main filter screen (231), a flange (233) is mounted on the outer edge of the large diameter side of the main filter screen (231), the flange (233) is rotatably connected to the first bearing (24), and a bottom rotor (235) and a filter screen bottom plate (234) are mounted on the inner edge of the small diameter side of the main filter screen (231).

4. A wet desulfurization device with automatic filter screen flushing function according to claim 1, characterized in that: The circular sweeping device (6) comprises a circular moving device (63) and a motor (62); the circular moving device (63) is installed in the tower body (1); a reaction auxiliary device (5) is installed on the circular moving device (63); a cleaning roller (61) is rotatably installed on the circular moving device (63); the motor (62) is installed on the tower body (1); an output shaft of the motor (62) passes through the tower body (1) and is installed with a bevel gear (64); the bevel gear (64) is meshed with the circular moving device (63) for transmission.

5. A wet desulfurization device with automatic filter screen flushing function according to claim 4, characterized in that: The annular motion device (63) comprises a fourth bearing (633) and an inner gear ring (634). The fourth bearing (633) and the inner gear ring (634) are both installed in the tower body (1). A bevel gear ring (632) is rotatably installed inside the fourth bearing (633). A fixed ring (631) is installed inside the bevel gear ring (632). A fixed frame (635) is installed at the top of the fixed ring (631). A reaction auxiliary device (5) is installed on the inner gear ring (634). A cleaning roller (61) is rotatably installed on the fixed frame (635). The bevel gear ring (632) is meshed with the bevel gear (64) for transmission.

6. A wet flue gas desulfurization device with automatic filter screen flushing function according to claim 5, characterized in that: The cleaning roller (61) comprises a roller (612) and a rotating rod (613); the roller (612) is rotatably connected to a fixed ring (631) via the rotating rod (613); a transmission gear (611) is coaxially mounted on the rotating rod (613); and the transmission gear (611) is meshed with an internal gear ring (634) for transmission.

7. A wet flue gas desulfurization device with automatic filter screen flushing function according to claim 5, characterized in that: The reaction auxiliary device (5) comprises an air pump seat (51), wherein the air pump seat (51) is mounted on a fixing ring (631), an air pump (56) is mounted inside the air pump seat (51), an air intake spoiler fan (55) is movably mounted on the top of the air pump seat (51) via a third bearing (510), a hollow connecting rod (52) is mounted on the bottom of the air pump seat (51), one end of the air pump (56) is connected to an air intake funnel tube (57), and the other end of the air pump (56) is movably connected to an air outlet funnel tube (58), the air intake funnel tube (57) is located inside the air intake spoiler fan (55), the air outlet funnel tube (58) is located inside the hollow connecting rod (52), a jet slurry (53) is rotatably mounted on the bottom of the hollow connecting rod (52) via a second bearing (59), and a bottom scraping slurry (54) is mounted on the bottom of the jet slurry (53) via a connecting rod.

8. A wet flue gas desulfurization device with automatic filter screen flushing function according to claim 7, characterized in that: The air intake turbulence fan (55) comprises a hollow fan shaft (554), an air suction cover (552) is installed at the top of the hollow fan shaft (554), a plurality of air suction fan (553) pieces are installed between the hollow fan shaft (554) and the air suction cover (552), a plurality of turbulence fan blades (551) are installed at the top of the air suction cover (552), the hollow fan shaft (554) is rotatably connected to the air pump seat (51) via a third bearing (510), and the air intake funnel (57) is located inside the hollow fan shaft (554).

9. A wet flue gas desulfurization device with automatic filter screen flushing function according to claim 7, characterized in that: The jet slurry (53) comprises a jet shaft (533), the top end of the jet shaft (533) is rotatably connected to the bottom end of the hollow connecting rod (52) via a second bearing (59), a plurality of hollow blades (531) are mounted on the outside of the jet shaft (533), the hollow blades (531) are connected to the inside of the jet shaft (533), a plurality of jet heads (532) are mounted on the hollow blades (531), the jet heads (532) are connected to the inside of the hollow blades (531), and a scraping slurry (54) is mounted on the bottom end of the jet shaft (533) via a connecting rod.

10. A wet flue gas desulfurization device with automatic filter screen flushing function according to claim 9, characterized in that: The bottom scraping slurry comprises a bottom scraping shaft (543), wherein the bottom scraping shaft (543) is connected to the bottom end of the jet shaft (533) via a connecting rod, a plurality of bottom scraping blades (541) are mounted on the bottom scraping shaft (543), and a bottom scraping plate (542) is mounted on the bottom scraping blades (541).

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