Flue gas purification device for solid waste incinerator

Abstract

The invention relates to the technical field of waste incineration, and discloses a solid waste incinerator flue gas purification device which comprises a treatment bin and a plurality of purification pipes arranged in the treatment bin. The purification pipe comprises a filter pipe and a catalysis pipe; the catalytic pipe is arranged in the filter pipe and is detachably connected with the filter pipe, a mixing area is formed between the inner wall of the filter pipe and the outer wall of the catalytic pipe, and the bottom of the mixing area is communicated with the catalytic pipe; a filter cake scraping mechanism is arranged outside the filter pipe, the catalytic pipe can be independently disassembled and assembled when the filter cake scraping mechanism is in a closed state, and the thickness of a filter cake outside the filter pipe can be controlled through rotation of the filter cake scraping mechanism when the filter cake scraping mechanism is in an open state. And meanwhile, a good catalytic environment can be provided.

Description

Technical Field

[0001] The present invention relates to the technical field of waste incineration, and particularly to a flue gas purification device for a solid waste incinerator. Background Art

[0002] In a high-temperature incinerator, the combustible components in the waste undergo a violent chemical reaction with oxygen in the air, converting into high-temperature flue gas and stable fixed residues. The flue gas contains a large amount of particulate matter, fly ash, nitrogen oxides, sulfides and other substances, and direct emission will cause air pollution.

[0003] In the prior art, an SCR denitration system is usually used to denitrate the flue gas. Specifically, after the flue gas enters the semi-dry reaction tower and the bag filter, it then enters the SCR reactor. At this time, although the particulate matter in the flue gas is removed by the bag filter, which can prevent the clogging of the catalytic channels of the SCR reactor, the gas will dissipate heat during the flow through the previous treatment, and the working temperature of the bag filter is low and not resistant to high temperature. As a result, in this process, the temperature of the flue gas entering the SCR is about 160 degrees Celsius. At this temperature, the residual sulfur oxides in the flue gas will react with the catalyst to form ammonium bisulfate, resulting in catalyst poisoning and inactivation. To ensure the normal service life of the catalyst, an additional heating / heat exchange device is required to heat and regenerate the catalyst, or to increase the temperature of the flue gas before entering the SCR.

[0004] Therefore, in order to solve the problem of the reduced service life caused by the direct entry of the original flue gas into the SCR reactor, a denitration and dust removal integrated device and process are provided in the prior art. After the high-temperature flue gas passes through the acid removal tower, it directly enters the denitration and dust removal integrated device. The device is internally provided with ceramic fiber filter tubes. The dust is blocked and adsorbed on the surface of the ceramic fiber filter tubes, while the nitrogen oxides and ammonia enter the interior of the ceramic fiber tubes. A catalyst is impregnated in the interior of the ceramic fiber tubes. When the flue gas enters the interior of the ceramic fiber filter tubes, N0 X reacts chemically with ammonia under the action of the catalyst to be reduced to nitrogen and water. The dust blocked on the outer surface of the filter tubes is blown to the lower ash hopper by compressed air, and a part of the waste residue is recycled through the conveying device, and a part is sent to the waste residue bin for collection. The clean flue gas that meets the discharge standards after treatment is transported to the chimney and discharged into the atmosphere through a fan.

[0005] However, in a conventional SCR denitration structure, in order to ensure the denitration quality, a rectifier and three layers of catalysts are arranged in sequence in the reaction chamber. The size of a single-layer catalyst is generally 960mm×1900mm×1220mm. In a ceramic fiber tube, the catalyst is infiltrated in the tube wall. To achieve the original catalytic specifications, a wall thickness of 2 - 3m is required. Moreover, the fiber tube wall needs to filter the flue gas, and its filtration pore size is extremely small, measured in nanometers. Obviously, compared with the honeycomb catalytic module of the original SCR reactor, it will cause the mixed gas to not enter stably at the same time, and fly ash and particulate matter will form filter cakes on the surface of the fiber tube. Although the filter cakes can further provide a filtering effect, too thick filter cakes will also further affect the gas inlet rate, and too thin filter cakes cannot provide effective pre-filtration.

[0006] On the other hand, the service life of the ceramic fiber filter tube can usually reach 7 or 8 years, while the normal replacement period of the catalyst is as long as 3 or 4 years at most and as short as 1 or 2 years at least. In order to ensure the catalytic efficiency, it is necessary to replace the ceramic fiber filter tube when it can still work, resulting in low material utilization rate and increased use cost.

[0007] In summary, there is an urgent need for a flue gas purification device for a solid waste incinerator that can make full use of the filtering function of the ceramic fiber tube and at the same time provide a good catalytic environment. Summary of the Invention

[0008] In view of the aseptic protection problems existing in the prior art, a flue gas purification device for a solid waste incinerator is proposed, which can make full use of the filtering function of the ceramic fiber tube and at the same time provide a good catalytic environment.

[0009] To solve the above problems, the technical solution of the present invention is as follows:

[0010] A flue gas purification device for a solid waste incinerator, comprising a treatment chamber and purification tubes. A plurality of the purification tubes are arranged in the treatment chamber; the purification tubes include filter tubes and catalytic tubes; the catalytic tubes are arranged inside the filter tubes and are detachably connected to the filter tubes. A mixing area is formed between the inner wall of the filter tube and the outer wall of the catalytic tube, and the bottom of the mixing area is communicated with the catalytic tube; a mixing impeller is arranged in the mixing area at the bottom of the catalytic tube, and the mixing impeller is movably connected to the inner wall of the filter tube; the purification tubes include a filter cake scraping mechanism, and the filter cake scraping mechanism includes fan blades and a rotating table. The fan blades are arranged on the rotating table, the rotating table is connected to the mixing impeller, the fan blades are arranged outside the filter tube, and a scraping part is arranged on the fan blades, and there is a distance between the scraping part and the outer wall of the filter tube.

[0011] As a preferred technical solution, the rotating table is detachably connected to the mixing impeller.

[0012] As a preferred technical solution, the filter tube includes a fiber filter tube wall and a gas mixing hood. The gas mixing hood is arranged at the bottom of the fiber filter tube and its tube wall is airtight.

[0013] As a preferred technical solution, the fan blade is movably connected to the rotating table.

[0014] As a preferred technical solution, a slag guiding hood is further provided. The slag guiding hood is connected to the inner wall of the waste residue area, and an installation plane is provided thereon. The filter tube is connected to the installation plane.

[0015] As a preferred technical solution, the fan blades can rotate to form an annular wall.

[0016] As a preferred technical solution, the gas mixing hood is detachably connected to the fiber filter tube wall. Among them, the gas mixing hood is arranged outside the treatment chamber, and the fiber filter tube wall is arranged inside the treatment chamber.

[0017] Advantages of the present invention:

[0018] 1. The flue gas purification device of the solid waste incinerator of the present invention includes a treatment chamber and a purification tube. A plurality of purification tubes are arranged in the treatment chamber, which can increase the contact area of the flue gas and improve the intake efficiency. The purification tube includes a filter tube and a catalytic tube. The catalytic tube is arranged inside the filter tube and is detachably connected to the filter tube, so that the catalytic tube can be replaced independently of the filter tube to avoid waste of material replacement caused by inconsistent service lives of the filter tube and the catalytic tube. A mixing area is formed between the inner wall of the filter tube and the outer wall of the catalytic tube. The bottom of the mixing area is communicated with the catalytic tube. After the filtered flue gas enters the mixing area, it gathers and moves downward to the inlet of the catalytic tube, so that the mixed gas can pass through the catalytic tube at the same time and fully contact the catalyst to complete the reaction. A mixing impeller is arranged on the mixing area. The mixing impeller can rotate by using the flow of the gas to provide stirring and mixing for the gas about to enter the catalytic tube. And a filter cake scraping mechanism is arranged outside the filter tube. The filter cake scraping mechanism includes a fan blade and a rotating table. The fan blade is movably connected to the rotating table. A plurality of fan blades are arranged on the rotating table. A scraping part is arranged on the fan blade. There is a distance between the scraping part and the outer wall of the fiber filter tube wall. When the rotating table drives the fan blade to rotate, the scraping part can scrape the filter cake outside the filter tube and can retain a certain thickness of the filter cake, so that the pre-filtration of the filter cake can be controlled. The rotating table is detachably connected to the mixing impeller, so that the rotating table can be driven by the mixing impeller, realizing the utilization of resources. And the rotating table is connected to the mixing impeller, so that by rotating the mixing impeller, the cleaning of the filter cake can be realized.

[0019] 2. In the flue gas purification device of the solid waste incinerator of the present invention, the gas mixing hood is detachably connected to the wall of the fiber filter tube. Among them, the gas mixing hood is arranged outside the treatment chamber, and the wall of the fiber filter tube is inside the treatment chamber, so that the gas mixing hood can be directly disassembled from the outside to replace the catalytic tube therein. Moreover, the purification tube further includes a filter cake scraping mechanism, which is arranged on the outer side of the wall of the fiber filter tube and can be opened or closed. When closed, it can isolate the contact between the flue gas and the filter tube, enabling the catalytic tube to be replaced separately, that is, the catalytic tube can be replaced without shutting down the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of a flue gas purification device of a solid waste incinerator of the present invention;

[0021] Figure 2 is Figure 1 sectional view taken along line A in

[0022] Figure 3 Partial sectional view of a purification tube of a flue gas purification device of a solid waste incinerator of the present invention;

[0023] Figure 4 Partial sectional view of the bottom of the purification tube of a flue gas purification device of a solid waste incinerator of the present invention;

[0024] Figure 5 Partial sectional view of the bottom of the purification tube with a filter cake scraping mechanism of a flue gas purification device of a solid waste incinerator of the present invention;

[0025] Figure 6 Partial sectional view of the purification tube and the waste residue area of another flue gas purification device of a solid waste incinerator of the present invention;

[0026] Figure 7 Schematic diagram of the cooperation between the mixing impeller and the filter cake scraping mechanism of another flue gas purification device of a solid waste incinerator of the present invention;

[0027] Figure 8 Schematic diagram of the connection at the top of the catalytic tube of another flue gas purification device of a solid waste incinerator of the present invention;

[0028] Figure 9 Schematic diagram of the closed state of the filter cake scraping mechanism of another flue gas purification device of a solid waste incinerator of the present invention.

[0029] The reference numerals and components involved in the drawings are as follows:

[0030] 1. Processing bin 2. Purification pipe 3. Mixing area 4. Mixing impeller 11. Clean gas area 12. Flue gas area 13. Waste residue area 21. Filter pipe 22. Catalytic pipe 23. Filter cake scraping mechanism 41. Through hole 111. Clean gas outlet 121. Flue gas inlet 131. Waste residue outlet 211. Fiber filter pipe 212. Gas mixing hood 231. Fan blade 232. Rotating table 2311. Scraping part 24. Guide slag hood DETAILED DESCRIPTION OF THE INVENTION

[0031] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following provides a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings of the specification.

[0032] Please refer to the attached Figure 1 , the attached Figure 1 is a schematic diagram of a flue gas purification device for a solid waste incinerator of the present invention; a flue gas purification device for a solid waste incinerator includes a treatment chamber 1 and a purification pipe 2. The treatment chamber 1 includes a clean gas area 11, a flue gas area 12, and a waste residue area 13. The clean gas area 11 is located above the flue gas area 12 and is provided with a clean gas outlet 111. A negative pressure device such as an exhaust fan is provided in the corresponding channel of the clean gas outlet 111. The clean gas area 11 is communicated with the flue gas area 12 through the purification pipe 2. Specifically, a partition for separating the space is provided between the flue gas area 12 and the clean gas area 11. The tops of several purification pipes 2 are connected to the partition, and the clean gas area 11 is communicated with the inside of the purification pipe 2 through the pipe orifice of the purification pipe 2. The waste residue area 13 is connected below the flue gas area 12 and is a trough structure surrounded by inclined plates. Filtered waste residue particles, fly ash, etc. can slide along the inclined plates to the waste residue conveying device, and the waste residue conveying device is a screw drive device, etc., which is a prior art. Please refer to the attached Figure 2 , Figure 2 is Figure 1 a sectional view taken along line A in Figure 3 ; The purification pipe 2 has its pipe body disposed in the flue gas area 12 and includes a filter pipe 21 and a catalytic pipe 22. The filter pipe 21 is a fiberglass pipe, and its outer wall can filter the flue gas. The catalytic pipe 22 is disposed inside it. Specifically, the catalytic pipe 22 is a pipe body structure with a honeycomb catalyst carrier inside. The top of the catalytic pipe 22 is connected to the top of the filter pipe 21 and is communicated with the clean gas area 11. A gap is left between the bottom of the catalytic pipe 22 and the bottom of the filter pipe 21 for gas to pass through. That is, a mixing area 3 is formed between the outer wall of the catalytic pipe 22 and the inner wall of the filter pipe 21. The flue gas passes through the filter and gathers in the mixing area 3 and flows downward and is only communicated with the inside of the catalytic pipe 22 through the bottom. Please refer to the attached Figure 3 ; Figure 3 is a partial sectional view of a flue gas purification device for a solid waste incinerator of the present invention. The attached Figure 3 shows different connection methods between the purification pipe 2 and the flue gas area 12. Figure 3 does not show the honeycomb structure inside it; In some embodiments, the catalytic pipe 22 and the filter pipe 21 are detachably connected, that is, a sealed snap connection is made between the top of the filter pipe 21 and the catalytic pipe 22. That is, a sealing structure such as a sealing ring is provided at the connection between the filter pipe 21 and the catalytic pipe 22. The catalytic pipe 22 and the partition of the flue gas area 12 can also adopt a detachable sealed snap connection. Correspondingly, the clean gas area 11 and the flue gas area 12 are detachably connected, and the cover of the clean gas area 11 can be opened to expose the partition of the flue gas area 12, facilitating the replacement of the above components.

[0033] Working principle: The flue gas area 12 of the treatment chamber 1 accesses high-temperature flue gas through the flue gas inlet 121. It should be understood that in the channel connected to the flue gas inlet, there is at least a device that can introduce ammonia into the flue gas, such as an ammonia water atomization spraying device, a liquid ammonia evaporation spraying device, etc. These are all prior arts. The flue gas mixed with ammonia enters the flue gas area 12 and passes through the tube wall of the filter tube 21 into the mixing area 3. The filtered waste residue is collected in the waste residue area 13 and is conveyed out of the treatment chamber 1 through the conveying device at the waste residue outlet 131; the mixed gas entering the mixing area 3 moves downward along the tube wall under the negative pressure attraction of the clean gas area 11 to the inlet end at the bottom of the catalytic tube 22, and passes through the catalyst inside the catalytic tube 22. The generated clean gas enters the clean gas area 11 from the top and is discharged from the clean gas outlet 111 into the next treatment process; when the service life of the catalyst is reached, only need to turn off the treatment equipment, open the clean gas area 11, take out the catalytic tube 22 in the filter tube 21 and insert a new catalytic tube 22.

[0034] It should be noted that: in the flue gas purification device of the solid waste incinerator of the present invention, the filter tube 21 is a ceramic fiber tube, which can withstand high temperatures and directly filter high-temperature flue gas, so that the catalytic reaction can be maintained at an appropriate temperature and avoid the generation of substances that are likely to cause catalyst poisoning and failure; in the present invention, the catalyst is arranged in the catalytic tube 22, and the inside of the catalytic tube 22 is a honeycomb structure. The flue gas enters from the bottom of the catalytic tube 22 and is conveyed upward along the catalytic tube 22 under the attraction of negative pressure, which greatly guarantees the contact time between the mixed gas and the catalyst, so that the flue gas can react sufficiently. There is a gap in the mixing area 3 between the catalytic tube 22 and the filter tube 21. The flue gas enters the mixing area 3 and is sucked into the inlet of the catalytic tube 22 at the bottom. Since air gathers towards narrow places, the mixing degree of the flue gas is improved.

[0035] Please refer to the attached Figure 4 , Figure 4This is a schematic diagram of a partial cross-section of the bottom of the purification pipe of a flue gas purification device for a solid waste incinerator according to the present invention; in some preferred embodiments, in order to increase the mixing degree of the gas entering the catalytic pipe 22, a mixing impeller 4 is provided in the mixing zone 3, and the mixing impeller 4 is arranged at the bottom of the catalytic pipe 22. The mixing impeller 4 is a bearing rotation structure provided with a number of blades, and the blades drive the bearing to rotate under the impact of the flue gas, so as to stir the downward-accumulated flue gas. Preferably, the filter pipe 21 includes a fiber filter pipe 211 and a gas mixing cover 212. The gas mixing cover 212 is arranged at the bottom of the fiber filter pipe 211 and its pipe wall is airtight, so that the gas completely passes through the mixing impeller 4, ensuring the driving force of the flue gas on the mixing impeller 4; it should be understood that for the convenience of disassembling the catalytic pipe 22, the catalytic pipe 22 and the mixing impeller 4 are detachably movably connected. Specifically, the mixing impeller 4 is sleeved on the outer wall of the catalytic pipe 22 through a bearing, reducing the rotation resistance of the mixing impeller 4. When replacing the catalytic pipe 22, the catalytic pipe 22 sleeved on the bearing of the mixing impeller 4 can be taken out or placed from above, as shown in the appendix Figure 5 The groove mechanism for sleeving the catalytic pipe 22 on the mixing impeller 4 is further shown in the figure. When ball bearings are provided on the groove wall, the rotation of the mixing impeller 4 relative to the catalytic pipe 22 can be facilitated.

[0036] It should be noted that when the filter pipe 21 filters the flue gas, the filtered filter residue, that is, particulate fly ash in the flue gas, forms a filter cake structure on the outer wall of the filter pipe 21. The filter cake structure itself can provide a certain pre-filtration effect on the incoming flue gas. When the filter cake reaches a certain thickness, in order to avoid the influence of the too thick filter cake on the filtration efficiency, usually a gas backwashing mechanism is required to clean the filter cake so that it detaches from the outer wall of the filter pipe 21, such as setting a backwashing air port at the top of the filter pipe 21 to provide high-pressure clean gas, etc., but this will cause the filter cake to completely fall off and lose the pre-filtration efficiency; in some embodiments, in order to be able to reasonably clean the filter cake formed outside the filter pipe 21, the backwashing cleaning structure is cancelled, and the filter cake is cleaned by arranging a rotatable scraping blade around the filter pipe 21. Specifically, please refer to the appendix Figure 5 , Figure 5 This is a schematic diagram of a partial cross-section of the bottom of the purification pipe of a flue gas purification device for a solid waste incinerator according to the present invention with a filter cake scraping mechanism ( Figure 5 The mixing impeller 4 shown in the figure is the same as that in Figure 4Different connection structures can drive the cake scraping mechanism 23 outside it to rotate). The purification pipe 2 includes a cake scraping mechanism 23. The cake scraping mechanism 23 includes fan blades 231 and a rotating table 232. In this embodiment, the rotating table 232 and the mixing impeller 4 are an inseparable integral structure. The fan blades 231 arranged on the rotating table 232 can be multiple and at least one. In order to improve the stability of the fan blades, bearings are arranged around the axis of the filter pipe 21 on the partition plate. The other end of the fan blade 231 is connected to the bearing on the partition plate. Through the rotating table 232 and the bearing, it can rotate around the wall of the filter pipe 21 driven by the mixing impeller 4. A scraping part 2311 is arranged on the fan blade 231. The scraping part 2311 has a distance from the outer wall of the fiber filter pipe 211. The size of this distance is the reserved thickness of the filter cake, which can be designed according to actual needs. When the mixing impeller 4 drives the fan blade 231 to rotate, the scraping part 2311 contacts the outer wall of the filter cake, scrapes off the filter cake exceeding the predetermined thickness, can retain an appropriate thickness of the filter cake, maintain a stable filtering efficiency, and prevent the backwashing cleaning from completely removing the filter cake, resulting in the inability to utilize the filtering efficiency of the filter cake.

[0037] It should be understood that when the catalytic pipe 22 needs to be replaced, the work of the equipment needs to be paused and the clean gas area 11 needs to be opened to achieve this, which affects the solid waste treatment efficiency; please refer to the attached Figure 6 , Figure 6 Figure 7 is a partial sectional view of the purification pipe and the waste residue area of another solid waste incinerator flue gas purification device of the present invention, showing different cake scraping mechanisms 23; in this embodiment, the gas mixing cover 212 and the fiber filter pipe 211 of the solid waste incinerator flue gas purification device of the present invention are detachably connected, and the fiber filter pipe 211 is arranged in the treatment chamber 1, and the gas mixing cover 212 is arranged outside the treatment chamber 1. Preferably, in order to cope with the inclined surface of the waste residue area 13, a slag guiding cover 24 is arranged at the lower part of the purification pipe 2, that is, an inverted frustum structure. The slag guiding cover 24 is connected to the side of the waste residue area 13. The slag guiding cover 24 provides an installation plane for the cake scraping mechanism 23; the fiber filter pipe 211 is connected to the wall surface in the waste residue area 13 of the slag guiding cover 24. The mixing impeller 4 and the gas mixing cover 212 complete the enclosure of the mixing area 3. The cake scraping mechanism 23 is several fan blades 231 arranged on the rotating table 232. Please refer to the attached Figure 7 , Figure 7Another schematic diagram of the flue gas purification device of the solid waste incinerator of the present invention shows the cooperation between the mixing impeller and the filter cake scraping mechanism. Only one set of fan blades is shown in the figure to display the connecting parts. Chamfered inclined surfaces are provided on both the control link and the mixing impeller to facilitate changing the direction of the force and realizing the expansion and contraction of the control link. Specifically, the fan blade 231 is movably connected to the rotating table 232. A control link connected to a spring is provided at the bottom end of each fan blade 231. One end of the link passes through the inner wall of the rotating table 232. In the initial state, under the thrust of the spring, the sides of the fan blades 231 are in contact with each other to form an annular baffle and cooperate with the installation plane of the slag guide cover 24 to isolate the flue gas from the filter pipe 21. Also, at the top of the fan blade 231, a closed structure is formed with the partition plate. See the appendix Figure 9 , the control link protrudes from the inner wall of the rotating table 232. When installing the mixing impeller 4, under the action of the outer wall of the mixing impeller 4, the control link contracts back into the rotating table 232, driving the fan blade 231 to rotate and open it. After the fan blade 231 is opened, there is a certain distance between its scraping part 2311 and the outer surface of the filter pipe 21. See the appendix Figure 6 ; Moreover, the fan blade 231 rotating around the filter pipe 21 can stir the surrounding flue gas to make it fully mixed. Preferably, the rotated fan blade 231 forms a certain angle with the diameter of the filter pipe 21 and rotates in the acute angle direction, which has the effect of conveying the flue gas into the filter pipe 21. The outer wall of the mixing impeller 4 is frictionally connected to the inner wall of the rotating table 232. At the same time, the elastic force provided by the spring can increase the frictional force between the outer wall of the mixing impeller 4 and the rotating table 232, enabling them to rotate together.

[0038] It should be noted that: Please see the appendix Figure 8 , Figure 8 Another schematic diagram showing the connection at the top of the catalytic tube of the flue gas purification device of the solid waste incinerator of the present invention; in the figure, a card slot is provided at the top of the purification tube 2 for clamping the top end of the catalytic tube 22. The partition plate of the fan blade 231 is connected by a bearing; a through hole 41 is provided on the mixing impeller 4. During the flue gas filtration and purification, the through hole 41 fits with the inner wall of the rotating table 232 to prevent air leakage. When the catalytic tube 22 needs to be replaced, the gas mixing cover 212 is pulled downward. The mixing impeller 4 is fixedly connected to the gas mixing cover 212, driving the mixing impeller 4 to move downward until the through hole 41 communicates with the outside. At this time, the filter cake scraping mechanism 23 is closed, as shown in the appendix Figure 9 shown, Figure 9Schematic diagram of the closed state of the filter cake scraping mechanism of another flue gas purification device for a solid waste incinerator of the present invention; and under the action of negative pressure, the residual flue gas in the mixing zone 3 is treated. The through hole 41 can balance the internal and external air pressures, and the negative pressure can prevent the flue gas from overflowing from the through hole 41. It should be understood that a sealing gasket can also be provided on the outer wall of the mixing impeller 4 to improve the sealing performance; the inverted conical bottom space of the slag guiding cover 24 can also facilitate the disassembly of the gas mixing cover 212, and the individual replacement of each catalytic tube can be realized under the working state. The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and supplements can still be made, and these improvements and supplements should also be regarded as the protection scope of the present invention.

Claims

1. A flue gas purification device for a solid waste incinerator, characterized in that, It includes a treatment chamber and purification pipes, and several of the purification pipes are arranged in the treatment chamber; the purification pipes include filter pipes and catalytic pipes; the catalytic pipe is arranged inside the filter pipe and is detachably connected to the filter pipe, and a mixing zone is formed between the inner wall of the filter pipe and the outer wall of the catalytic pipe, and the bottom of the mixing zone is communicated with the catalytic pipe; a mixing impeller is arranged in the mixing zone at the bottom of the catalytic pipe, and the mixing impeller is movably connected to the inner wall of the filter pipe; the purification pipe includes a filter cake scraping mechanism, and the filter cake scraping mechanism includes fan blades and a rotating table, the fan blades are arranged on the rotating table, the rotating table is connected to the mixing impeller, the fan blades are arranged outside the filter pipe, and a scraping part is arranged on the fan blades, and the scraping part has a distance from the outer wall of the filter pipe.

2. The flue gas purification device for a solid waste incinerator according to claim 1, characterized in that, The rotating table is detachably connected to the mixing impeller.

3. The flue gas purification device for solid waste incinerator according to claim 2, characterized in that, The filter pipe includes a fiber filter pipe wall and a gas mixing cover, and the gas mixing cover is arranged at the bottom of the fiber filter pipe and its pipe wall is airtight.

4. The flue gas purification device for a solid waste incinerator according to claim 3, characterized in that The fan blades are movably connected to the rotating table.

5. The flue gas purification device for solid waste incinerator according to claim 4, characterized in that, A slag guiding cover is also provided, the slag guiding cover is connected to the inner wall of the waste residue area, and an installation plane is arranged on the slag guiding cover, and the filter pipe is connected to the installation plane.

6. The flue gas purification device for a solid waste incinerator according to claim 5, characterized in that, The fan blades can rotate to form an annular wall.

7. The flue gas purification device for solid waste incinerator according to claim 6, characterized in that, The gas mixing cover is detachably connected to the fiber filter pipe wall, wherein the gas mixing cover is arranged outside the treatment chamber, and the fiber filter pipe wall is arranged inside the treatment chamber.

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