Filtering device of flue gas desulfurization tower

Abstract

The utility model relates to the technical field, in particular to a filtering device of a flue gas desulfurization tower, which is used for filtering sulfur-containing flue gas in the desulfurization tower and comprises a Y-shaped filter and a straight return type filter element, the Y-shaped filter consists of a pipe body and a sleeve joint, the pipe body is hollow and is of a Y-shaped structure, and the sleeve joint is sleeved on the pipe body. The interior of the pipe body is divided into a flow inlet section, a filtering section and a flow outlet section in the flue gas inlet and outlet direction, the flow inlet section and the flow outlet section are connected to a flue gas discharge pipeline of the desulfurization tower through sleeve joints respectively, and a gas flow guide assembly used for guiding the flow direction of flue gas is arranged at the joint of the flow inlet section and the filtering section; the straight return type filter element is inserted into the filter section, and a cleaning assembly used for cleaning sulfide particles attached to the inner wall after smoke is filtered is arranged at the bottom of the straight return type filter element. Smoke is filtered by arranging the straight return type filter element, so that sulfide particles in the smoke can be effectively captured and separated, generated waste water and solids are independently separated, recycling, transportation and treatment are facilitated, and secondary pollution is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to a filtering device of a flue gas desulfurization tower. Background Art

[0002] At present, the flue gas discharged in industrial production often contains pollutants such as sulfide, which has a serious impact on the environment and health. Therefore, desulfurization is usually carried out when the flue gas is discharged. The methods of flue gas desulfurization include dry flue gas desulfurization process, spray dry flue gas desulfurization process, fly ash dry flue gas desulfurization technology, wet flue gas desulfurization process, etc. The process, form and mechanism of wet flue gas desulfurization in various countries in the world are similar. It mainly uses limestone, quicklime or sodium carbonate slurry as a detergent to wash the flue gas in the reaction tower to remove sulfur dioxide in the flue gas. This process has a history of 50 years. After continuous improvement and perfection, the technology is relatively mature, with high desulfurization efficiency (90% to 98%), large unit capacity, strong adaptability to coal types, low operating costs and easy recovery of by-products.

[0003] During the desulfurization process of the traditional desulfurization tower, its Y-type filter can only be filtered through a simple filter net, the sulfides in the flue gas cannot be cleaned out, and the filtration efficiency is low; and after the sulfides in the flue gas are desulfurized, the impurities generated will remain inside the filter, requiring manual cleaning on a regular basis. During the cleaning process, the filter needs to be disassembled and installed, which is time-consuming and labor-intensive. Utility Model Content

[0004] In order to solve the technical defects raised in the above-mentioned background technology, the purpose of the utility model is to provide a filtering device for a flue gas desulfurization tower, aiming to solve the problems of low filtering efficiency and difficult maintenance of existing filters.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A filtering device for a flue gas desulfurization tower, used for filtering sulfur-containing flue gas in the desulfurization tower, comprising a Y-type filter and a straight-return filter element, wherein the Y-type filter is composed of a tube body with a hollow interior and a Y-shaped structure and a sleeve joint sleeved on the tube body, wherein the tube body is divided into an inlet section, a filter section and an outlet section along the direction of flue gas inlet and outlet, wherein the inlet section and the outlet section are respectively connected to the flue gas discharge pipe of the desulfurization tower through a sleeve joint, and an airflow guide component for guiding the direction of flue gas flow is provided at the junction of the inlet section and the filter section; The filter element is inserted into the filter section, and a cleaning component for cleaning sulfide particles attached to the inner wall after flue gas filtration is arranged at the bottom of the straight-back filter element; the flue gas is filtered by arranging the straight-back filter element in the Y-type filter, and the lime water sprayed by the water mist nozzle reacts with the sulfide-containing particles in the flue gas, so that the sulfide particles in the flue gas can be effectively captured and separated, and the wastewater and solids generated can be separated separately, which is convenient for recycling, transportation and treatment, does not generate secondary pollution, and has a good filtering effect and can meet environmental protection emission standards.

[0007] Preferably, the airflow guiding assembly includes a guide plate and a sealing plate, wherein the sealing plate is connected to the connection point between the inlet section and the filter section to form a closed structure, and the sealing plate is an arc-shaped structure; the guide plate is arranged on one side of the filter section extending to the inlet section; by arranging the airflow guiding assembly to guide the flue gas discharge, the flue gas is filtered and desulfurized according to a preset path, thereby avoiding the situation where the flue gas is directly discharged without filtration.

[0008] Preferably, a plurality of guide plates are provided, and the plurality of guide plates are inclined downward toward the straight-back filter element, and an air flow channel for smoke to pass through is formed between two adjacent guide plates; by providing a plurality of guide plates, the flow direction and speed of the air flow are adjusted, so that the smoke is evenly filtered through the straight-back filter element, thereby improving the filtration efficiency.

[0009] Preferably, the cleaning assembly includes a waterproof box, a water-blocking plate, an eccentric cam and a vibration motor, the water-blocking plate is arranged at the bottom of the straight-return filter element, and a center hole is opened in the middle of the water-blocking plate; the eccentric cam and the vibration motor are connected by a transmission shaft; the vibration motor is installed in the waterproof box; the eccentric cam is driven by the vibration motor to generate a shock effect when the smoke passes through, thereby promoting the shedding and separation of sulfide particles attached to the inner wall of the straight-return filter element; and it replaces the manual disassembly and cleaning method of the straight-return filter element, thereby effectively reducing labor costs and improving cleaning efficiency.

[0010] Preferably, one end of the transmission shaft passes through the center hole and is rotatably connected to the vibration motor, and the other end extends into the straight-return filter element and is connected to the eccentric cam, and a sealing gasket is provided at the connection between the transmission shaft and the center hole; by providing the sealing gasket, it is possible to effectively prevent water in the straight-return filter element from flowing into the waterproof box, causing damage to the vibration motor and affecting the cleaning work.

[0011] Preferably, the straight-back filter element is a hollow tubular structure, and a water inlet and a drain outlet are respectively provided on both sides of the straight-back filter element near the bottom, and the water inlet and the drain outlet extend to the outside of the pipe mouth of the filtration section; by setting the water inlet, it is convenient for lime water to enter the straight-back filter element to react with the flue gas for desulfurization, and by setting the drain outlet, it is convenient to discharge the impurities after filtration.

[0012] Preferably, a plurality of filter holes are evenly arranged on the outer wall of the straight-back filter element, and the plurality of filter holes are evenly arranged between the water inlet and the drain outlet; by providing a plurality of filter holes, it is convenient for smoke to pass through and quickly enter the straight-back filter element for filtration, and at the same time, it can prevent the filtered sulfur-containing compounds from flowing out of the straight-back filter element.

[0013] Preferably, a plurality of water mist nozzles are arranged at the top of the inner wall of the straight-return filter element, and the water mist nozzles are connected to the water inlet through a water pipe; by arranging the water mist nozzles in the straight-return filter element, the lime water sprayed by the water mist nozzles is reacted with the sulfide-containing particles in the flue gas, so that the particles sink to the bottom of the water and are drained through the drain outlet, and the filtered flue gas is then discharged through the outflow section, and the wastewater and solids generated are easy to be recycled, transported and treated, and no secondary pollution is generated.

[0014] Preferably, a sealing baffle is provided on the inner wall of the tube body at the junction of the filter section and the outflow section, the sealing baffle abuts against the top of the straight-return filter element, and a plurality of ventilation holes are opened near the middle position of the sealing baffle, and the ventilation holes are connected to the straight-return filter element; the sealing baffle is provided to block the smoke from flowing directly out of the gap between the straight-return filter element and the filter section, so that the smoke must be filtered through the straight-return filter element before it can be discharged from the ventilation holes.

[0015] Preferably, the sleeve joint includes a ring and a locking nut, the rings are respectively sleeved on the pipe openings of the inlet section, the filter section and the outlet section, and a locking groove is circumferentially opened on the ring, and the locking nut is threadedly connected to the outer side of the ring; by changing the flange connection mode to a sleeve joint connection mode, not only can the filter be installed quickly, but also, in an emergency, the Y-type filter can be quickly replaced, which greatly improves the work efficiency during installation and maintenance and reduces the corresponding cost.

[0016] In summary, the beneficial effects of the utility model are:

[0017] 1. The utility model changes the flange connection mode of the Y-type filter into a sleeve joint connection mode, which not only allows the Y-type filter to be quickly installed, but also allows the Y-type filter to be quickly replaced in an emergency, thereby greatly improving the work efficiency during installation and maintenance and reducing production costs.

[0018] 2. The utility model filters the flue gas by arranging a straight-return filter element in the Y-type filter, and uses the lime water sprayed by the water mist nozzle to react with the sulfide-containing particles in the flue gas, so as to effectively capture and separate the sulfide particles in the flue gas, and separate the wastewater and solids generated by it separately, which is convenient for recycling, transportation and treatment, does not generate secondary pollution, and has good filtering effect, which can meet environmental protection emission standards.

[0019] 3. The utility model provides an airflow guide component at the junction of the inlet section and the filter section, and uses the airflow guide component to adjust the flow direction and speed of the airflow, so that the smoke is evenly filtered through the straight-return filter element, thereby improving the filtering efficiency.

[0020] 4. The utility model sets a cleaning component at the bottom of the straight-return filter element; the cleaning component is used to make the smoke produce a shock effect when passing through the straight-return filter element, thereby promoting the shedding and separation of sulfide particles attached to the inner wall of the straight-return filter element; thereby replacing the manual disassembly and cleaning of the straight-return filter element, thereby reducing the workload of maintenance and cleaning, improving the filtering effect, and reducing operating energy consumption and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the filtering device of the flue gas desulfurization tower of the utility model;

[0022] Figure 2 It is an exploded view of the filter device of the flue gas desulfurization tower of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the straight return filter element in the utility model;

[0024] Figure 4 It is a partial cross-sectional view of the flue gas flow direction in the filter device of the flue gas desulfurization tower of the utility model;

[0025] Figure 5 It is a half-section view of the filter device of the flue gas desulfurization tower of the utility model;

[0026] Figure 6 yes Figure 5 An enlarged structural diagram of the airflow guide assembly at A in the middle;

[0027] Figure 7 yes Figure 5 Enlarged structural diagram of the cleaning component at B.

[0028] Description of reference numerals in the figures:

[0029] 1. Y-type filter; 11. Tube body; 111. Inlet section; 112. Filter section; 113. Outlet section; 12. Socket joint; 121. Ring; 122. Locking nut; 123. Locking groove; 2. Straight return filter element; 21. Filter hole; 22. Water inlet; 23. Water outlet; 24. Water mist nozzle; 3. Air flow guide assembly; 31. Guide plate; 32. Sealing plate; 33. Air flow channel; 4. Cleaning assembly; 41. Waterproof box; 42. Water baffle; 421. Center hole; 43. Eccentric cam; 44. Vibration motor; 45. Drive shaft; 5. Sealing gasket; 6. Sealing baffle; 61. Vent. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the utility model.

[0031] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0032] In the description of the utility model, if there is a word description such as "several", it means one or more, and the meaning of "more" is two or more. Greater than, less than, and more than are understood to exclude the number itself, and above, below, and within are understood to include the number itself. If there is a description of the first, second, and third, it is only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] The following is combined with Figure 1-7 , an embodiment of a filtering device for a flue gas desulfurization tower of the utility model is further described in detail.

[0034] A filtering device for a flue gas desulfurization tower, such as Figure 1 , 2As shown, it is used for filtering sulfur-containing flue gas in a desulfurization tower, and includes a Y-type filter 1 and a straight-return filter element 2. The Y-type filter 1 is composed of a tube body 11 with a hollow interior and a Y-shaped structure and a sleeve joint 12 sleeved on the tube body 11. The tube body 11 is divided into an inlet section 111, a filter section 112 and an outlet section 113 along the direction of flue gas inlet and outlet. The inlet section 111 and the outlet section 113 are respectively connected to the flue gas discharge pipe of the desulfurization tower through the sleeve joint 12, and an airflow guide component 3 for guiding the direction of flue gas flow is provided at the junction of the inlet section 111 and the filter section 112; the straight-return filter element 2 is inserted into the filter section 112, and the straight-return filter element 2 A cleaning component 4 for cleaning sulfide particles attached to the inner wall after flue gas filtration is provided at the bottom; wherein, the inlet section 111 of the Y-type filter 1 is connected to the air inlet end of the flue gas emission pipe, and the outlet section 113 is connected to the air outlet end of the flue gas emission pipe; when the desulfurization tower discharges flue gas, the flue gas flows into the Y-type filter 1 through the inlet section 111, and at the same time, under the action of the airflow guide component 3 between the inlet section 111 and the filter section 112, it flows into the filter section 112 according to a specified path, and the straight-return filter element 2 arranged in the filter section 112 will filter the flue gas, and the treated flue gas is discharged into the air from the outlet section 113.

[0035] It is worth mentioning that the straight-back filter element 2 can filter and react with the sulfide-containing particles in the flue gas, so that the sulfide particles in the flue gas can be effectively captured and separated, and the wastewater and solids generated by the flue gas can be separated separately, which is convenient for recycling, transportation and treatment, and does not produce secondary pollution. The filtering effect is good and can meet environmental emission standards. At the same time, the cleaning component 4 is used to make the flue gas produce a shock effect when passing through the straight-back filter element 2, thereby promoting the shedding and separation of sulfide particles attached to the inner wall of the straight-back filter element 2; thereby replacing the manual disassembly and cleaning of the straight-back filter element 2, thereby reducing the workload of maintenance and cleaning, and improving the filtering effect, reducing operating energy consumption and maintenance costs.

[0036] In this embodiment, if Figure 2 As shown, the sleeve joint 12 includes a ring 121 and a locking nut 122. The ring 121 is respectively sleeved on the pipe openings of the inlet section 111, the filter section 112 and the outlet section 113, and a locking groove 123 is circumferentially opened on the ring 121. The locking nut 122 is threadedly connected to the outer side of the ring 121.

[0037] Specifically, by changing the flange connection mode to the sleeve joint 12 connection mode, during installation, it is only necessary to respectively put the rings 121 at both ends of the pipe body 11 on the flue gas emission pipe of the desulfurization tower, and lock and fix it by rotating the locking nut 122. Not only can the Y-type filter 1 be installed quickly, but also the Y-type filter 1 can be quickly replaced in an emergency to prevent damage to other auxiliary equipment caused by damage to the Y-type filter 1, thereby greatly improving the work efficiency during installation and maintenance and reducing the corresponding cost.

[0038] In this embodiment, if Figure 3 As shown, the straight-return filter element 2 is a hollow tubular structure, and a water inlet 22 and a drain outlet 23 are respectively provided on both sides of the straight-return filter element 2 near the bottom end, and the water inlet 22 and the drain outlet 23 extend to the outside of the pipe mouth of the filter section 112; a plurality of filter holes 21 are evenly provided on the side wall of the straight-return filter element 2, and the plurality of filter holes 21 are evenly arranged between the water inlet 22 and the drain outlet 23; a plurality of water mist nozzles 24 are provided on the top of the inner wall of the straight-return filter element 2, and the water mist nozzles 24 are connected to the water inlet 22 through a water pipe.

[0039] Specifically, the filter hole 21 can facilitate the rapid passage of flue gas, and enter the straight-return filter element 2 along the filter hole 21 for filtration, and at the same time prevent the filtered sulfur-containing compounds from flowing out of the straight-return filter element 2; the water inlet is set to facilitate the lime water to enter the straight-return filter element through the water mist nozzle 24 to react with the flue gas for desulfurization, and the lime water sprayed by the water mist nozzle 24 reacts with the sulfide-containing particles in the flue gas, causing them to sink to the bottom of the water and be drained through the drain port 23; thereby, the waste water and solids generated by it can be easily recycled, transported and processed, without generating secondary pollution, and the filtering effect is good, which can meet environmental protection emission standards.

[0040] In this embodiment, if Figure 4 , 5 As shown, a sealing baffle 6 is provided on the inner wall of the tube body 11 at the junction of the filter section 112 and the outflow section 113. The sealing baffle 6 abuts against the top of the straight-return filter element 2, and a plurality of ventilation holes 61 are opened on the sealing baffle 6 near the middle position, and the ventilation holes 61 are connected to the straight-return filter element 2.

[0041] Specifically, after the flue gas flows into the filter section 112, in order to prevent the flue gas from directly flowing out from the gap between the straight-return filter element 2 and the tube body 11, a sealing baffle 6 is set to block it, so that the flue gas must be filtered by the straight-return filter element 2 before it can be discharged from the vent 61 on the sealing baffle 6; when the flue gas flows into the straight-return filter element 2, the lime water sprayed by the water mist nozzle 24 absorbs the sulfur-containing compounds in the flue gas and combines into particulate matter, which falls to the bottom of the straight-return filter element 2 and is discharged through the drain port 23, while the filtered flue gas flows to the sealing baffle 6, and flows out from the vent 61 on the sealing baffle 6 to the outlet section 113 of the Y-type filter 1, thereby completing the discharge.

[0042] In this embodiment, if Figure 6 As shown, the airflow guide assembly 3 includes a guide plate 31 and a sealing plate 32. The sealing plate 32 is connected to the connecting point between the inlet section 111 and the filter section 112 to form a closed structure, and the sealing plate 32 is an arc-shaped structure. The guide plate 31 is arranged on one side of the filter section 112 extending to the inlet section 111, and a plurality of guide plates 31 are arranged, and the plurality of guide plates 31 are inclined downward toward the straight-return filter element 2, and an airflow channel 33 for smoke to pass through is formed between two adjacent guide plates 31.

[0043] Specifically, when the smoke flows into the tube body 11 through the inlet section 111, since the sealing plate 32 completely seals the gap between the filter section 112 and the inlet section 111 in the tube body 11, the airflow will inevitably flow into the straight-return filter element 2 along the airflow channel 33 formed between the guide plates 31 after flowing into the inlet section 111. At the same time, under the action of the guide plate 31, the flow direction and speed of the airflow can be quickly adjusted, so that the smoke can be evenly filtered through the straight-return filter element 2, thereby improving the filtration efficiency.

[0044] In this embodiment, if Figure 7 As shown, the cleaning assembly 4 includes a waterproof box 41, a water-blocking plate 42, an eccentric cam 43 and a vibration motor 44. The water-blocking plate 42 is arranged at the bottom of the straight-return filter element 2, and a center hole 421 is opened in the middle of the water-blocking plate 42; the eccentric cam 43 and the vibration motor 44 are connected through a transmission shaft 45; the vibration motor 44 is installed in the waterproof box 41; one end of the transmission shaft 45 passes through the center hole 421 and is rotatably connected to the vibration motor 44, and the other end extends into the straight-return filter element 2 and is connected to the eccentric cam 43, and a sealing gasket 5 is provided at the connection between the transmission shaft 45 and the center hole 421.

[0045] Specifically, the waterproof box 41 is embedded in the filter section 112, and a cover plate is provided at the bottom thereof. The cover plate can be opened by rotating it to inspect the internal vibration motor 44 or replace parts. The water-blocking plate 42 is connected between the straight-return filter element 2 and the waterproof box 41 to prevent water from entering the waterproof box 41. At the same time, for the convenience of cleaning, the transmission shaft 45 connected to the output end of the vibration motor 44 passes through the water-blocking plate 42 and extends into the straight-return filter element 2. In order to avoid water leakage, a sealing gasket 5 is sleeved between the water-blocking plate 42 and the transmission shaft 45. The sealing gasket 5 can effectively prevent the water in the straight-return filter element 2 from flowing into the waterproof box 41. Avoid causing damage to the vibration motor 44 and affecting the cleaning work; the cleaning principle of the cleaning component 4 is to use the vibration motor 44 to drive the eccentric cam 43. During the rotation, the eccentric cam 43 intermittently hits the inner wall of the straight return filter element 2, so that it produces a vibration effect when the smoke passes through, thereby promoting the shedding and separation of sulfide particles attached to the inner wall of the straight return filter element 2; and replace the manual disassembly and cleaning of the straight return filter element 2, thereby effectively reducing labor costs and improving cleaning efficiency; at the same time, in addition to the vibration cleaning method, water spraying or other appropriate cleaning methods can also be used.

[0046] The working principle of this utility model:

[0047] The Y-type filter 1 of the utility model is installed on the flue gas discharge pipe of the desulfurization tower through the sleeve joint 12, wherein the inlet section 111 of the Y-type filter 1 is connected to the air inlet end of the flue gas discharge pipe, and the outlet section 113 is connected to the air outlet end of the flue gas discharge pipe; when the desulfurization tower discharges flue gas, the flue gas flows into the Y-type filter 1 through the inlet section 111, and is blocked by the blocking plate 32 between the inlet section 111 and the filter section 112, so that the flue gas can only flow into the filter section 112 through the guide channel between the guide plates 31, and the flue gas in the filter section 113 is blocked by the blocking plate 32 between the inlet section 111 and the filter section 112. The straight-return filter element 2 arranged in 12 will filter the smoke. First, the smoke enters the gap between the straight-return filter element 2 and the tube body 11, and under the action of the sealing baffle 6, the smoke cannot be discharged directly without passing through the straight-return filter element 2; then, the smoke enters the interior of the straight-return filter element 2 through the filter hole 21, and the water mist nozzle 24 arranged at the top of the straight-return filter element 2 evenly sprays lime water on the smoke through the water inlet 22, absorbs the sulfur-containing compounds in the smoke by chemical means, and generates particulate impurities that fall into the straight-return filter element 2. The bottom end of the filter element 2 is then discharged from the drain port 23; the smoke after filtration rises and floats to the through hole on the sealing baffle 6 and is discharged into the outflow section 113, and is discharged to the smoke exhaust pipe of the desulfurization tower through the outflow section 113; the lime water sprayed by the water mist nozzle 24 reacts with the sulfide particles in the smoke, so that the sulfide particles in the smoke can be effectively captured and separated, and the wastewater and solids generated by the smoke can be separated separately, which is convenient for recycling, transportation and treatment, and does not generate secondary pollution. The filtration effect is good and can meet the environmental protection emission standards. Accurate; at the same time, the airflow direction and speed are adjusted by using the airflow guide component 3, so that the smoke is evenly filtered through the straight-return filter element 2, thereby improving the filtering efficiency; in addition, the cleaning component 4 is set to make the smoke produce a shock effect when passing through the straight-return filter element 2, thereby promoting the shedding and separation of sulfide particles attached to the inner wall of the straight-return filter element 2; thereby replacing the manual disassembly and cleaning of the straight-return filter element 2, thereby reducing the workload of maintenance and cleaning, improving the filtering effect, and reducing the operating energy consumption and maintenance costs.

[0048] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A filtering device for a flue gas desulfurization tower, used for filtering sulfur-containing flue gas in a desulfurization tower, characterized in that: It includes a Y-type filter and a straight-back filter element. The Y-type filter consists of a tube body with a hollow interior and a Y-shaped structure and a sleeve joint sleeved on the tube body. The tube body is divided into an inlet section, a filter section and an outlet section along the direction of flue gas inlet and outlet. The inlet section and the outlet section are respectively connected to the flue gas emission pipe of the desulfurization tower through a sleeve joint, and an airflow guide component for guiding the direction of flue gas flow is provided at the junction of the inlet section and the filter section; the straight-back filter element is inserted into the filter section, and a cleaning component for cleaning sulfide particles attached to the inner wall after flue gas filtration is provided at the bottom of the straight-back filter element.

2. The filtering device of the flue gas desulfurization tower according to claim 1, characterized in that: The airflow guide assembly includes a guide plate and a sealing plate. The sealing plate is connected to the connection point between the inlet section and the filter section to form a closed structure, and the sealing plate is an arc-shaped structure. The guide plate is arranged on one side of the filter section extending to the inlet section.

3. The filtering device of the flue gas desulfurization tower according to claim 2, characterized in that: There are multiple guide plates, and the multiple guide plates are tilted downward toward the straight-return filter element, and an air flow channel for smoke to pass through is formed between two adjacent guide plates.

4. The filtering device of the flue gas desulfurization tower according to claim 1, characterized in that: The cleaning assembly includes a waterproof box, a water-blocking plate, an eccentric cam and a vibration motor. The water-blocking plate is arranged at the bottom of the straight-return filter element, and a center hole is opened in the middle of the water-blocking plate; the eccentric cam and the vibration motor are connected through a transmission shaft; and the vibration motor is installed in the waterproof box.

5. The filtering device of the flue gas desulfurization tower according to claim 4, characterized in that: One end of the transmission shaft passes through the center hole and is rotatably connected to the vibration motor, and the other end extends into the straight-return filter element and is connected to the eccentric cam, and a sealing gasket is provided at the connection between the transmission shaft and the center hole.

6. The filtering device of the flue gas desulfurization tower according to claim 1, characterized in that: The straight-return filter core is a hollow tubular structure, and a water inlet and a water outlet are respectively provided on both sides of the straight-return filter core near the bottom, and the water inlet and the water outlet extend outside the pipe mouth of the filter section.

7. The filtering device of the flue gas desulfurization tower according to claim 1, characterized in that: A plurality of filter holes are evenly arranged on the outer side wall of the straight-return filter element, and the plurality of filter holes are evenly arranged between the water inlet and the drain outlet.

8. The filtering device of the flue gas desulfurization tower according to claim 1, characterized in that: A plurality of water mist nozzles are arranged on the top of the inner wall of the straight-return filter element, and the water mist nozzles are connected to the water inlet through a water pipe.

9. The filtering device of the flue gas desulfurization tower according to claim 1, characterized in that: A sealing baffle is provided on the inner wall of the tube body at the junction of the filtering section and the outflow section, the sealing baffle abuts against the top of the straight-return filter element, and a plurality of ventilation holes are opened near the middle position of the sealing baffle, and the ventilation holes are connected to the straight-return filter element.

10. The filtering device of the flue gas desulfurization tower according to claim 1, characterized in that: The sleeve joint includes a collar and a locking nut. The collar is respectively sleeved on the pipe openings of the inlet section, the filter section and the outlet section, and a locking groove is circumferentially opened on the collar. The locking nut is threadedly connected to the outer side of the collar.

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