Membrane filtration and purification device for flue gas of corner tube boiler

Abstract

The invention relates to the technical field of flue gas treatment, and particularly discloses a corner tube boiler flue gas membrane filtration and purification device which comprises a main body structure, a plurality of filtration structures and a driving unit, the plurality of filtering structures are arranged in the main body structure at equal intervals, the filtering structures are detachably arranged, the filtering structures can rotate on the main body structure, the driving unit is fixedly arranged on the main body structure, and the driving unit is connected with the filtering structures. The comprehensiveness and thoroughness of flue gas purification are greatly improved through a layer-by-layer progressive filtering mode, dust, particulate matter and micro-suspended impurities in flue gas can be effectively removed, position changing and blocking prevention can be adjusted, the device is adaptive to the high-temperature flue gas working condition, automatic filtering and back flushing are achieved, the functions are diversified, and operation is convenient and fast.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment technology, specifically to a membrane filtration and purification device for flue gas from a corner tube boiler. Background Technology

[0002] As a commonly used thermal energy equipment in industrial production, heating and heat supply, corner tube boilers generate flue gas containing dust, particulate matter, sulfides and micro-suspended impurities during operation. Direct emission of such flue gas would cause air pollution and would not meet environmental emission standards. Currently, most flue gas purification devices for corner tube boilers on the market adopt a single filtration method, either using only liquid spray for coarse filtration or using a filter membrane for fine filtration. Single liquid filtration is difficult to remove fine particulate matter in flue gas, resulting in insufficient filtration accuracy. While single membrane filtration has a better filtration effect, the filter membrane is prone to clogging due to the adhesion of impurities in the flue gas, leading to a rapid decline in filtration efficiency, poor device operation stability, lack of automatic adjustment and anti-clogging design, and a cumbersome process for disassembling and assembling the filter membrane. It requires a large-scale disassembly of the device after shutdown to complete replacement and cleaning, which not only increases the workload and time cost of maintenance, but also reduces the overall operating efficiency of the boiler. Summary of the Invention

[0003] The purpose of this invention is to solve the aforementioned technical problems of poor filtration effect, easy clogging, and cumbersome disassembly and maintenance in existing filtration systems, so as to meet the requirements of efficient, stable, and environmentally friendly use of flue gas purification in corner tube boilers in industrial production. To achieve the purpose of this invention, the following technical solution is adopted.

[0004] To address the aforementioned problems, the present invention provides the following technical solution: a membrane filtration and purification device for flue gas from a corner tube boiler, comprising a main structure, several filter structures, and a drive unit; the filter structures are equidistantly arranged within the main structure, the filter structures are detachable and rotatable on the main structure, and the drive unit is fixedly mounted on the main structure and connected to the filter structures. The main structure is used for liquid filtration of flue gas and to support the filtration structure. The filtration structure is used for membrane filtration of flue gas. The drive unit is used to provide power to the filtration structure, thereby achieving automatic adjustment to prevent clogging. The entire device can also use liquid to backwash the filtration structure.

[0005] Preferably, the main structure includes a treatment tank, a water injection pipe, a drain pipe, a tray, an air inlet pipe, a tank cover, and an exhaust pipe; the lower inner wall of the treatment tank has a conical structure, and two pairs of arc-shaped filter ports are equidistantly spaced on the side wall near the top of the treatment tank; one end of the water injection pipe is fixedly inserted through the right side wall of the treatment tank and located below the filter ports; several spray holes are opened on the side wall of the water injection pipe located inside the treatment tank; one end of the drain pipe is fixedly inserted into the bottom of the left side wall of the treatment tank and located below the water injection pipe; the tray is fixedly fitted onto the treatment tank, and the upper wall of the tray fits into the bottom of the filter ports. The tray has two pairs of first shaft holes equidistantly arranged, and the first shaft holes are concentric with the filter port. One end of the air inlet pipe is fixedly inserted through the upper wall of the treatment tank, and the other end of the air inlet pipe is located below the water injection pipe. The tank cover is circular and has a hollow structure. The tank cover is detachably fastened to the upper wall of the treatment tank by bolts, and the tank cover is fitted onto the air inlet pipe. The lower wall of the tank cover has two pairs of second shaft holes that are the same as and correspond to the first shaft holes equidistantly arranged. The lower wall of the tank cover has air intake ports that correspond to the filter port equidistantly arranged. One end of the exhaust pipe is fixedly connected to the side wall of the tank cover, and the exhaust pipe is connected to the air intake ports respectively.

[0006] Preferably, the filter structure includes a filter frame, two pairs of top claws, several springs, a top plate, and two pairs of tubular filter membrane bodies. The filter frame is cylindrical, and the bottom side wall of the filter frame has a groove. The top side wall of the filter frame has two pairs of mounting grooves corresponding to the filter openings at equal intervals. The lower wall of each mounting groove has a flip groove in the middle. The lower wall of the filter frame has a shaft corresponding to the first shaft hole in the middle. The filter frame is detachably placed between the tray and the can lid, and the filter frame is movably embedded in the filter opening. One end of each of the two pairs of top claws is movably embedded in the flip groove, and the middle of the top claw can be located above the mounting groove. Several springs are fixedly set between the other end of the top claw and the mounting groove. The top plate is fixedly set at the top of the filter frame, and the lower wall of the top plate has two pairs of countersunk openings that fit with the mounting grooves at equal intervals. The upper wall of the top plate has a shaft corresponding to the second shaft hole in the middle. The two pairs of tubular filter membrane bodies are detachably embedded in the mounting grooves.

[0007] Preferably, the drive unit includes a frame, a motor, a pulley, and a belt; one end of the frame is fixedly disposed on the side wall of the processing tank and located between a pair of filter ports; the motor is fixedly disposed on the lower wall of the frame and the motor drive end is opposite to the tray; the pulley is fixedly disposed on the motor drive end; and the belt is movably fitted onto the groove of the filter frame and the pulley.

[0008] Preferably, in order for the filter structure to replace the tubular filter membrane body, the motor drives the filter structure to rotate on the body structure via a belt.

[0009] Preferably, the tubular filter membrane body is fixed in the countersunk opening of the top plate by a top claw.

[0010] Preferably, the filter port is fitted and sealed to the side walls of the mounting groove of the filter frame.

[0011] Preferably, the exhaust pipe is connected to the tubular filter membrane body and the filter port through the air intake of the canister cap.

[0012] Preferably, in order for the filter port to fit and seal with the filter frame and to be rotatable, the bottom of the filter port is provided with a protrusion that fits into the groove, for blocking and sealing the groove.

[0013] The present invention proposes a membrane filtration and purification device for flue gas from a corner tube boiler. The beneficial effects are as follows: through the coordinated design and precise coordination of the main structure, filtration structure, and drive unit, it effectively solves the technical problems of poor filtration effect, easy clogging, and inconvenient maintenance in traditional corner tube boiler flue gas purification devices, achieving efficient flue gas purification and stable and convenient operation of the device. Specific beneficial effects are as follows: 1. This invention relies on the exclusive structural design of the treatment tank and its precise fit with the filtration structure to construct a multi-stage flue gas purification process of liquid filtration, spray dust removal, and tubular membrane filtration. The boiler flue gas first completes coarse liquid filtration in the treatment tank, then achieves deep dust removal through water injection pipe spraying, and finally completes fine filtration through the tubular filter membrane before being discharged. The progressive filtration method greatly improves the comprehensiveness and thoroughness of flue gas purification, effectively removing dust, particulate matter and micro-suspended impurities from the flue gas, and meeting environmental emission requirements.

[0014] 2. The filter structure of the present invention can rotate flexibly on the treatment tank. With the help of the drive unit, the prefabricated tubular filter membrane body can be automatically repositioned and adjusted, avoiding blockage caused by impurities adhering to a single filter membrane area due to long-term use, and ensuring the continuous stability of filtration efficiency. At the same time, the tubular filter membrane body can be made of ceramic filter membrane, whose high temperature resistance is suitable for the treatment conditions of high-temperature flue gas in corner tube boilers, which broadens the application range of the device and improves its industrial applicability.

[0015] 3. The filter structure design of this invention has dual core functions. On the one hand, it can automatically switch multiple sets of tubular filter membrane bodies to achieve rotation filtration, ensuring continuous operation of the device. On the other hand, it can connect corresponding pipelines according to actual usage needs to perform backwashing and cleaning of the filter structure. This realizes an integrated design of automatic filter replacement and backwashing, which reduces the maintenance workload and time cost of the device, extends the service life of the filter membrane body, and further improves the operational stability, economy and versatility of the device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of the present invention broken down; Figure 2 This is a schematic diagram of the main structure assembly of the present invention; Figure 3 This is a schematic diagram of the breakdown structure of the filter structure of the present invention; Figure 4 This is a schematic diagram of the assembly structure of the filter structure of the present invention; Figure 5 This is a schematic diagram of the assembly structure of the filter structure and the main structure of the present invention; Figure 6 This is a schematic diagram of the split structure of the drive unit of the present invention; Figure 7 This is a partially enlarged structural diagram of point A in the present invention; Figure 8 This is a partially enlarged structural diagram of point B in the present invention; Figure 9 for Figure 7 Installation and display structure diagram; Figure 10 This is a schematic diagram illustrating the use of the present invention.

[0017] In the diagram: 1. Main structure, 11. Processing tank, 12. Water injection pipe, 13. Drain pipe, 14. Tray, 15. Air inlet pipe, 16. Tank cover, 17. Exhaust pipe, 2. Filter structure, 21. Filter frame, 22. Top claw, 23. Spring, 24. Top plate, 25. Tubular filter membrane body, 3. Drive unit, 31. Frame, 32. Motor, 33. Pulley, 34. Belt, 4. Filter port, 5. Air inlet, 6. First shaft hole, 7. Second shaft hole, 8. Groove, 91. Mounting groove, 92. Tilting groove, 10. Protrusion. Detailed Implementation

[0018] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0019] like Figures 1-10 As shown, the present invention provides a technical solution: a membrane filtration and purification device for flue gas from a corner tube boiler, comprising a main structure 1, a plurality of filter structures 2, and a drive unit 3; the plurality of filter structures 2 are equidistantly arranged within the main structure 1, the filter structures 2 are detachable and can rotate on the main structure 1, the drive unit 3 is fixedly arranged on the main structure 1, and the drive unit 3 is connected to the filter structures 2; wherein, the main structure 1 is used for liquid filtration of flue gas and to support the filter structures 2, the filter structures 2 are used for membrane filtration of flue gas, and the drive unit 3 is used to provide power to the filter structures 2, thereby achieving automatic adjustment to prevent clogging, and the entire device can also use liquid to backwash the filter structures 2.

[0020] As a further embodiment of the present invention, the main structure 1 includes a treatment tank 11, a water injection pipe 12, a drain pipe 13, a tray 14, an air inlet pipe 15, a tank cover 16, and an exhaust pipe 17. The lower inner wall of the treatment tank 11 has a conical structure. Two pairs of arc-shaped filter ports 4 are equidistantly provided on the side wall near the top of the treatment tank 11. One end of the water injection pipe 12 is fixedly inserted through the right side wall of the treatment tank 11 and located below the filter ports 4. Several spray holes are provided on the side wall of the water injection pipe 12 located inside the treatment tank 11. One end of the drain pipe 13 is fixedly inserted into the bottom of the left side wall of the treatment tank 11 and located below the water injection pipe 12. The tray 14 is fixedly fitted onto the treatment tank 11, and the upper wall of the tray 14 fits into the bottom of the filter ports 4. Two pairs of first shaft holes 6 are equidistantly provided on the tray 14, and the first shaft holes 6 are concentrically arranged with the filter ports 4. One end of the air inlet pipe 15 is fixedly inserted through the water injection pipe 16. The air inlet pipe 15 passes through the upper wall of the treatment tank 11, and one end of the air inlet pipe 15 is located below the water injection pipe 12. The tank cover 16 is circular and has a hollow structure. The tank cover 16 is detachably fastened to the upper wall of the treatment tank 11 by bolts, and the tank cover 16 is fitted onto the air inlet pipe 15. The lower wall of the tank cover 16 has two pairs of second shaft holes 7 that are the same as and correspond to the first shaft hole 6 at equal intervals. The lower wall of the tank cover 16 has air intake ports 5 that correspond to the filter port 4 at equal intervals. One end of the exhaust pipe 17 is fixedly connected to the side wall of the tank cover 16, and the exhaust pipe 17 is connected to the air intake port 5. The tank cover 16 and the treatment tank 11 cooperate to form a filter port 4 that can be embedded in the filter structure 2. Water is added through the water injection port and dust is removed by spraying. Wastewater is discharged through the drain pipe 13. Flue gas is discharged into the equipment through the air inlet pipe 15 and the treated gas is discharged through the exhaust pipe 17.

[0021] More specifically, the treatment tank 11, with its conical inner lower wall, serves as the core supporting cavity of the device. It provides a closed treatment space for the water washing and coarse filtration of flue gas, as well as for spray dust removal. Its conical bottom structure also enables efficient collection of dust-laden wastewater, preventing dust and liquid accumulation inside the tank. Two pairs of arc-shaped filter ports 4 are equidistantly spaced near the top side wall of the treatment tank 11. These are combined with a tray 14 fixedly fitted onto the treatment tank 11, with its upper wall fitting flush with the bottom of the filter ports 4. A cavity-structured tank cover 16, detachably fastened to the upper wall of the treatment tank 11 by bolts, utilizes a first shaft hole 6 concentrically positioned on the tray 14 with the filter ports 4, and a second shaft hole 6 corresponding to the first shaft hole 6 on the lower wall of the tank cover 16. The dual-axis hole 7 provides a stable, detachable mounting position and a precise rotational base for the filter structure 2, ensuring that the filter structure 2 can rotate stably within the filter port 4 to achieve automatic repositioning and anti-clogging functions. Through the air inlet pipe 15, which penetrates the upper wall of the treatment tank 11 and extends below the water injection pipe 12, the flue gas generated by the angle tube boiler can be directly introduced into the water at the bottom of the treatment tank 11, achieving the first step of water washing and coarse filtration of the flue gas. Combined with the water injection pipe 12, which penetrates the side wall of the treatment tank 11, is located below the filter port 4, and has several spray holes at its inner end, it can perform deep dust removal by spraying the rising flue gas after water washing, constructing a progressive two-stage flue gas pretreatment system that effectively removes large particles from the flue gas. The removal of particulate and medium-sized impurities significantly reduces the processing load of subsequent membrane filtration units, improving the overall effectiveness of flue gas purification. Through the air intake 5 corresponding to the filter port 4 on the lower wall of the tank cover 16, and the exhaust pipe 17 fixedly connected to the side wall of the tank cover 16 and communicating with the air intake 5, the clean flue gas finely filtered by the filter structure 2 can be uniformly collected and discharged from the device, ensuring the smoothness and sealing of the entire flue gas filtration process. Simultaneously, the drain pipe 13 inserted into the bottom of the left side wall of the treatment tank 11 enables rapid discharge of wastewater under normal filtration and backwashing conditions. The detachable tank cover 16 design also facilitates overall maintenance and disassembly / reassembly of the filter structure 2. Through the coordinated operation of its various components, the structure integrates multiple core functions, including flue gas introduction, two-stage pretreatment, filter structure support and positioning, clean flue gas diversion and discharge, and wastewater discharge. This creates a complete and smooth flue gas purification system, ensuring the cavity is sealed throughout the entire flue gas purification process to prevent unfiltered flue gas leakage. It also provides reliable structural support for the rotational anti-clogging, quick-installation and replacement, and backwashing functions of filter structure 2. This effectively solves the technical problems of poor pretreatment effect, cumbersome disassembly and maintenance of filter structure, and easy accumulation of liquid and dust in the treatment cavity of traditional corner tube boiler flue gas purification devices, significantly improving the flue gas purification effect, operational stability, and maintenance convenience of the device.

[0022] As a further embodiment of the present invention, the filter structure 2 includes a filter frame 21, two pairs of top claws 22, several springs 23, a top plate 24, and two pairs of tubular filter membrane bodies 25. The filter frame 21 is cylindrical, and the bottom side wall of the filter frame 21 is provided with a groove 8 around its circumference. The top side wall of the filter frame 21 is provided with two pairs of mounting grooves 91 at equal intervals corresponding to the filter port 4. Each mounting groove 91 has a turning groove 92 in the middle of its lower wall. The middle of the lower wall of the filter frame 21 is provided with a shaft column corresponding to the first shaft hole 6. The filter frame 21 is detachably placed between the tray 14 and the can lid 16, and the filter frame 21 is movably embedded in the filter port 4. One end of each of the two pairs of top claws 22 is movably embedded in the turning groove 92, and the top... The claw 22 is positioned above the mounting groove 91. Several springs 23 are fixedly installed between the other end of the top claw 22 and the mounting groove 91. The top plate 24 is fixedly installed on the top of the filter frame 21. Two pairs of countersunk openings 101 that fit into the mounting groove 91 are equidistantly opened on the lower wall of the top plate 24. A shaft column corresponding to the second shaft hole 7 is provided in the middle of the upper wall of the top plate 24. Two pairs of tubular filter membrane bodies 25 are detachably embedded in the mounting groove 91. The filter frame 21 carries multiple tubular filter membrane bodies 25. The force of the springs 23 causes the top claw 22 to push upward, inserting one end of the tubular filter membrane body 25 into the countersunk opening 101 of the top plate 24 for installation and positioning, thus facilitating disassembly.

[0023] More specifically, the shafts on the upper and lower walls of the columnar filter frame 21 correspond to the first shaft hole 6 of the tray 14 of the main structure 1 and the second shaft hole 7 of the tank cover 16, enabling the stable and rotatable installation of the filter structure 2 within the filter port 4 of the processing tank 11. Simultaneously, the groove 8 on the circumference of the bottom side wall of the filter frame 21 can form a transmission connection with the drive unit 3, providing a reliable structural foundation for the automatic repositioning and anti-clogging operation of the tubular filter membrane body 25. Through the elastic limiting structure formed by the mounting groove 91 and the flipping groove 92 at the top of the filter frame 21, the top claw 22, the spring 23, and the countersunk opening 101 of the top plate 24, the elastic force of the spring 23 pushes the top claw 22 upwards, stably limiting the tubular filter membrane body 25 between the mounting groove 91 and the countersunk opening 101 of the top plate 24. This design ensures both the accuracy of the filter membrane element installation and positioning and the structural stability during operation. It also enables quick and easy replacement of the tubular filter membrane body 25 without disassembly, allowing for filter membrane maintenance and replacement without stopping the machine and disassembling the main body of the device. This significantly reduces the workload and time cost of equipment maintenance. At the same time, the fitting and sealing design between the filter frame 21 and the filter port 4 effectively ensures the airtightness of the filter chamber, preventing unfiltered flue gas from leaking directly. This ensures that the flue gas to be treated can fully contact the tubular filter membrane body 25 to complete high-precision filtration. The overall structure integrates multiple functions such as rotational repositioning to prevent clogging, quick installation and replacement maintenance, and stable sealed filtration. It effectively solves the technical problems of easy clogging of filter membranes and cumbersome disassembly and maintenance in traditional filter devices, significantly improving the filtration efficiency, operational stability, and maintenance convenience of the device.

[0024] As a further embodiment of the present invention, the drive unit 3 includes a frame 31, a motor 32, a pulley 33, and a belt 34; one end of the frame 31 is fixedly disposed on the side wall of the processing tank 11 and located between a pair of filter ports 4; the motor 32 is fixedly disposed on the lower wall of the frame 31 and the drive end of the motor 32 is opposite to the tray 14; the pulley 33 is fixedly disposed on the drive end of the motor 32; and the belt 34 is movably fitted onto the groove 8 of the filter frame 21 and the pulley 33 respectively; the motor 32 drives the pulley 33 to rotate, and the friction of the rotating pulley 33 drives the belt 34, thereby synchronously driving multiple filter frames 21 to rotate under force.

[0025] More specifically, the frame 31, fixed to the side wall of the processing tank 11 and located between a pair of filter ports 4, provides stable mounting support for the motor 32. This ensures the operational stability of the overall transmission structure and avoids interference with the rotation and disassembly / maintenance of the filter structure 2. The pulley 33 fixed to the drive end of the motor 32 and the belt 34 fitted on the pulley 33 and the groove 8 of the filter frame 21 form a synchronous transmission cooperation. The power output of the motor 32 drives the pulley 33 to rotate, and the belt 34 synchronously drives multiple sets of filter frames 21 to rotate stably between the tray 14 and the tank cover 16. This facilitates the automatic repositioning and adjustment of the filter structure 2, the rapid replacement of the tubular filter membrane body 25, and the reverse rotation. It provides a stable and reliable power source for flushing and cleaning, and can realize the synchronous rotation and adjustment of multiple filter structures 2 without manual operation. This effectively avoids the clogging problem caused by impurities adhering to the tubular filter membrane body 25 due to long-term single-sided operation, and ensures the continuous and stable filtration efficiency of the device. At the same time, the tubular filter membrane body 25 to be replaced can be rotated to the outside of the treatment tank 11 for quick disassembly and assembly, which greatly simplifies the maintenance operation process of the device and reduces the maintenance difficulty and time cost. The overall transmission structure design is simple, the transmission efficiency is high, and the operation stability is strong, which significantly improves the automation level and continuous operation capability of the device, and is suitable for the long-term continuous operation of industrial corner tube boilers.

[0026] As a further embodiment of the present invention, in order to replace the tubular filter membrane body 25 with the filter structure 2, the motor 32 drives the filter structure 2 to rotate on the main body structure 1 via the belt 34; the tubular filter membrane body 25 is fixed in the countersunk opening 101 of the top plate 24 by the top claw 22, and the exhaust pipe 17 is connected to the tubular filter membrane body 25 and the filter port 4 through the air intake 5 of the can cover 16; in order to fit and seal the filter port 4 with the filter frame 21 and to allow it to rotate, the bottom of the filter port 4 is provided with a protrusion 10 that fits with the groove 8 for blocking and sealing the groove 8.

[0027] Its detailed connection method is a well-known technology in this field. The following mainly introduces the working principle and process, and the specific work is as follows.

[0028] Firstly, when the equipment is used for filtration, the water supply pipe 12 in the main structure 1 is connected to the water supply pipe, the drain pipe 13 is connected to the sewage pipe, the air inlet pipe 15 is connected to the boiler flue gas pipe, and the exhaust pipe 17 is connected to the exhaust pipe such as the fan. Then the flue gas enters the treatment tank 11 through the air inlet pipe 15 and enters the water collected at the bottom of the treatment tank 11. The flue gas will generate bubbles as it enters and filter the particulate matter in the water. After the flue gas is discharged from the water, it will be filtered again by spraying through the water injection pipe 12. Secondly, the flue gas flows upward from the bottom of the treatment tank 11. The flue gas passes through the filter port 4 and comes into contact with the tubular filter membrane body 25 in the installation groove 91. The flue gas enters the tubular filter membrane body 25 for fine filtration. The treated flue gas enters the tank cover 16 from the countersunk port 101 and the air intake port 5 of the top plate 24 and is then discharged through the exhaust pipe 17. By starting the motor 32 on the frame 31 of the drive unit 3, the motor 32 drives the pulley 33, which in turn drives the belt 34. The belt 34 contacts the groove 8 of the filter frame 21 and applies force, causing the filter frame 21 to rotate at the first shaft hole 6 and the second shaft hole 7 between the tray 14 and the can cover 16. This adjusts the position of the tubular filter membrane body 25, which is equidistantly set on the filter frame 21, to prevent long-term clogging. During the rotation of the groove 8, the protrusion 10 at the filter port 4 engages and blocks the groove 8, so that the filter frame 21 can fully engage and block the filter port 4. Since the used tubular filter membrane body 25 rotates to the outside of the treatment tank 11 after the filter frame 21 rotates, it can be directly removed from the sink installation groove 91 and replaced by pressing the top claw 22 to compress the spring 23 and lower it. When the equipment is used for cleaning, the exhaust pipe 17 is connected to the water supply line, and the water is diverted to multiple filter structures 2 through the tank cover 16, causing the water to flow back into the tubular filter membrane body 25 for rinsing. The rinsing wastewater also enters the treatment tank 11 through the installation groove 91 and the filter port 4 and is then discharged through the drain pipe 13. If the equipment is used specifically for cleaning, the filter structure 2 can also be rotated by the drive unit 3, thereby automatically cleaning multiple tubular filter membrane bodies 25.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A membrane filtration and purification device for flue gas from a corner tube boiler, characterized in that, It includes a main structure (1), several filter structures (2) and a drive unit (3); several filter structures (2) are equidistantly arranged in the main structure (1), the filter structures (2) are detachable and can rotate on the main structure (1), the drive unit (3) is fixedly arranged on the main structure (1) and connected to the filter structures (2); The main structure (1) is used for liquid filtration of flue gas and to support the filter structure (2). The filter structure (2) is used for membrane filtration of flue gas. The drive unit (3) is used to provide power to the filter structure (2), thereby achieving automatic adjustment to prevent clogging. The entire equipment can also use liquid to backwash the filter structure (2).

2. The flue gas membrane filtration and purification device for a corner tube boiler according to claim 1, characterized in that, The main structure (1) includes a processing tank (11), a water injection pipe (12), a drain pipe (13), a tray (14), an air inlet pipe (15), a tank cover (16), and an exhaust pipe (17). The lower inner wall of the treatment tank (11) is conical. Two pairs of arc-shaped filter ports (4) are equidistantly provided on the side wall near the top of the treatment tank (11). One end of the water injection pipe (12) is fixedly inserted through the right side wall of the treatment tank (11) and located below the filter ports (4). Several spray holes are provided on the side wall of the water injection pipe (12) located inside the treatment tank (11). One end of the drain pipe (13) is fixedly inserted into the bottom of the left side wall of the treatment tank (11) and located below the water injection pipe (12). The tray (14) is fixedly fitted onto the treatment tank (11), and the upper wall of the tray (14) fits into the bottom of the filter ports (4). Two pairs of first shaft holes (6) are equidistantly provided on the tray (14), and the first shaft holes (6) and the filter ports (4) are connected. The air inlet pipe (15) is fixedly inserted through the upper wall of the treatment tank (11) at one end, and the air inlet pipe (15) is located below the water injection pipe (12). The tank cover (16) is circular and has a hollow structure. The tank cover (16) is detachably fastened to the upper wall of the treatment tank (11) by bolts, and the tank cover (16) is fitted onto the air inlet pipe (15). The lower wall of the tank cover (16) is provided with two pairs of second shaft holes (7) that are the same as and correspond to the first shaft hole (6) at equal intervals. The lower wall of the tank cover (16) is provided with air intake ports (5) that correspond to the filter port (4) at equal intervals. One end of the exhaust pipe (17) is fixedly connected to the side wall of the tank cover (16), and the exhaust pipe (17) is connected to the air intake port (5) respectively.

3. The flue gas membrane filtration and purification device for a corner tube boiler according to claim 2, characterized in that, The filter structure (2) includes a filter frame (21), two pairs of top claws (22), several springs (23), a top plate (24), and two pairs of tubular filter membrane bodies (25). The filter frame (21) is cylindrical, and the bottom side wall of the filter frame (21) is provided with a groove (8) around its circumference. The top side wall of the filter frame (21) is provided with two pairs of mounting grooves (91) corresponding to the filter port (4) at equal intervals. The lower wall of each mounting groove (91) is provided with a flip groove (92). The lower wall of the filter frame (21) is provided with a shaft column corresponding to the first shaft hole (6). The filter frame (21) is detachably placed between the tray (14) and the can lid (16), and the filter frame (21) is movably embedded in the filter port (4). One end of each of the two pairs of top claws (22) is respectively The active fitting is installed in the flip groove (92), and the middle part of the top claw (22) can be located above the mounting groove (91). Several springs (23) are respectively fixedly installed between the other end of the top claw (22) and the mounting groove (91). The top plate (24) is fixedly installed on the top of the filter frame (21), and two pairs of countersunk mouths (101) that fit into the mounting groove (91) are equidistantly opened on the lower wall of the top plate (24). The middle part of the upper wall of the top plate (24) is provided with a shaft column corresponding to the second shaft hole (7). The two pairs of tubular filter membrane bodies (25) are respectively detachably installed in the mounting groove (91).

4. The flue gas membrane filtration and purification device for a corner tube boiler according to claim 3, characterized in that, The drive unit (3) includes a frame (31), a motor (32), a pulley (33), and a belt (34); One end of the frame (31) is fixedly installed on the side wall of the processing tank (11) and located between a pair of filter ports (4). The motor (32) is fixedly installed on the lower wall of the frame (31) and the driving end of the motor (32) is opposite to the tray (14). The pulley (33) is fixedly installed on the driving end of the motor (32). The belt (34) is movably fitted on the groove (8) of the filter frame (21) and the pulley (33).

5. The flue gas membrane filtration and purification device for a corner tube boiler according to claim 4, characterized in that, In order for the filter structure (2) to replace the tubular filter membrane body (25), the motor (32) drives the filter structure (2) to rotate on the body structure (1) via the belt (34).

6. The flue gas membrane filtration and purification device for a corner tube boiler according to claim 5, characterized in that, The tubular filter membrane body (25) is fixed in the countersunk opening (101) of the top plate (24) by the top claw (22).

7. The flue gas membrane filtration and purification device for a corner tube boiler according to claim 6, characterized in that, The filter port (4) is sealed to fit the side walls of the mounting groove (91) of the filter frame (21).

8. The flue gas membrane filtration and purification device for a corner tube boiler according to claim 7, characterized in that, The exhaust pipe (17) is connected to the tubular filter membrane body (25) and the filter port (4) through the air intake (5) of the can cover (16).

9. The flue gas membrane filtration and purification device for a corner tube boiler according to claim 8, characterized in that, In order for the filter port (4) to fit and seal with the filter frame (21) and to be able to rotate, the bottom of the filter port (4) is provided with a protrusion (10) that fits with the groove (8) to cover and seal the groove (8).

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