Environment-friendly dust removal filter bag for waste incineration flue gas

Abstract

The invention provides an environment-friendly dust removal filter bag for waste incineration flue gas, and belongs to the technical field of dust removal filter bags. Comprising a dedusting filter bag body, the dust removal filter bag body is formed by sequentially and fixedly connecting a gradient filter layer, a catalytic functional layer and an anti-corrosion surface layer, and is used for intercepting a large amount of dust and fly ash contained in waste incineration flue gas; the catalytic structure is arranged in the catalytic functional layer and is used for supporting the dust removal filter bag body and carrying out catalytic decomposition on passing harmful gas; the gas guide structure is arranged at the bottom of the gradient filter layer and is used for enabling the flue gas to generate rotational flow, and coarse particles in the flue gas settle in advance. Through the three-layer composite structure of the gradient filtering layer, the catalytic function layer and the anti-corrosion surface layer, the pore diameters of the three-layer composite structure are sequentially decreased, and meanwhile, the gradient filtering function and the catalytic function are integrated in the dustproof filter bag, so that ultralow emission of PM2.5 is achieved, physical interception and chemical purification of waste incineration flue gas are coordinated, and the problem of cooperative treatment of multiple pollutants is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of dust removal filter bags, and particularly to an environmental protection dust removal filter bag for waste incineration flue gas. Background Art

[0002] The dust removal filter bag is an efficient dust removal filter material, which has good ventilation performance, high dust removal efficiency, and certain acid resistance, alkali resistance and heat resistance. During the weaving process, multi-sided flocking is adopted to increase the fabric thickness, make it elastic, and the dust removal effect is very good. The dust removal filter bag is made of polyester staple fiber or long fiber as raw material, and its service life is generally 4-6 times that of glass fiber fabric.

[0003] The existing dust-proof filter bags cannot simultaneously achieve physical interception and chemical purification of waste incineration flue gas, and cannot solve the problem of co-treatment of multiple pollutants. At the same time, after the dust removal filter bag is installed, a skeleton support needs to be installed. Therefore, the present application provides an environmental protection dust removal filter bag for waste incineration flue gas to meet the requirements. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an environmental protection dust removal filter bag for waste incineration flue gas to solve the problems that the existing dust-proof filter bags cannot simultaneously achieve physical interception and chemical purification of waste incineration flue gas, cannot solve the problem of co-treatment of multiple pollutants, and a skeleton support needs to be installed after the dust removal filter bag is installed.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: An environmental protection dust removal filter bag for waste incineration flue gas, comprising a dust removal filter bag body; the dust removal filter bag body is fixedly connected in sequence by a gradient filtration layer, a catalytic function layer and an anti-corrosion surface layer, and is used for intercepting a large amount of dust and fly ash contained in waste incineration flue gas; a catalytic structure, which is arranged inside the catalytic function layer, is used for supporting the dust removal filter bag body and simultaneously catalytically decomposing the harmful gases passing through; a gas guiding structure, which is arranged at the bottom of the gradient filtration layer, is used for making the flue gas generate a swirl, so that the coarse particles in the flue gas settle in advance, and the dust load on the surface of the gradient filtration layer is reduced.

[0006] Optionally, the material of the catalytic function layer is a glass fiber substrate, its pore diameter is 5-10 microns, the outer shape of the catalytic function layer is adapted to the catalytic structure, a gap extending from the top to the bottom is opened at the top of the catalytic function layer for inserting the catalytic structure, and the top gap of the catalytic function layer is hermetically sewn with PTFE monofilament sutures made of the material.

[0007] Optionally, the catalytic structure includes a support unit for support and a catalytic unit for catalyzing harmful gases; the support unit includes a support tube located at the bottom of the catalytic functional layer, and a plurality of catalytic honeycomb holes linearly distributed are formed in the support tube. Every two adjacent catalytic honeycomb holes form a group, and a partition groove is formed between every two adjacent groups. A catalytic card slot is formed at the bottom of the support tube, the depth of the catalytic card slot is slightly less than the length of the support tube, and a limit card strip is fixedly connected to the top end of the support tube.

[0008] Optionally, the catalytic unit includes a guiding ring that fits against the bottom of the support tube. One side of the guiding ring is fixedly connected with an annular plate, and a plurality of catalytic plates annularly distributed are fixedly connected to one side of the annular plate. The plurality of catalytic plates correspond to the plurality of catalytic honeycomb holes one by one. The guiding ring is a semi-circular ring structure, and the support tube and the guiding ring are slidably connected through the catalytic card slot and the catalytic plate.

[0009] Optionally, the limit card strip is composed of a plurality of elastic cards annularly distributed; the elastic card is fixedly connected in sequence by a pressing section, a clamping section and a deformation section. The bottom of the deformation section is fixedly connected to the top of the support tube, the top of the deformation section is fixedly connected to the clamping section, the top of the clamping section is fixedly connected to the pressing section, the pressing section is arranged parallel to the support tube, the clamping section is an inwardly concave arc structure, and the deformation section is an arc structure.

[0010] Optionally, the material of the gradient filtration layer is PPS / P84 blended fiber, and it is woven into an interlaced fiber mesh structure through PPS / P84 blended fiber. Its pore diameter is 20-50 microns, and the outer wall of the gradient filtration layer is fixedly connected in a matching manner with the inner wall of the catalytic functional layer; a plurality of gradient ring holes are formed in the inner wall of the gradient filtration layer, the gradient ring holes are in the shape of a trapezoidal cross-section fold, and the depths of the plurality of gradient ring holes increase from the bag mouth to the bag bottom.

[0011] Optionally, the air guiding structure includes an air guiding disc connected to the bottom of the gradient filtration layer, and a plurality of spiral air guiding vanes annularly distributed are fixedly connected to the inner wall of the air guiding disc.

[0012] Optionally, the air guiding disc is connected by a first air guiding section, a second air guiding section and a third air guiding section. The first air guiding section is a bowl-shaped structure, the bottom of the first air guiding section is fixedly connected with an inwardly concave second air guiding section, one end of the second air guiding section is fixedly connected with an outwardly turned third air guiding section, the bottom of the second air guiding section is fixedly connected to the bottom of the gradient filtration layer, and the outer wall of the third air guiding section is fixedly connected to the inner wall of the gradient filtration layer.

[0013] Optionally, the material of the anti-corrosion surface layer is PTFE film material with a pore diameter of 0.1 - 0.5 microns. Hydrophobic layers are provided on both the inner and outer walls of the anti-corrosion surface layer.

[0014] Optionally, the surface wall of the hydrophobic layer is provided with micro-nano bumps with a symmetric gradient pore structure, which are used to imitate the micro-nano structure of the lotus leaf surface, so that its surface has superhydrophobic properties.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In the above solution, through the three-layer composite structure of the gradient filtration layer, the catalytic function layer and the anti-corrosion surface layer, the pore diameters on the three-layer composite structure decrease in sequence. At the same time, the gradient filtration and catalytic functions are integrated into the dust filter bag, realizing ultra-low emission of PM2.5, coordinating the physical interception and chemical purification of waste incineration flue gas, and solving the problem of coordinated treatment of multiple pollutants.

[0016] By setting the catalytic structure, the catalytic structure supports the dust removal filter bag body, and at the same time catalytically decomposes the harmful gases passing through. The support tube is used to support the entire catalytic function layer, and then provides physical support for the entire dust removal filter bag body, ensuring that the surface of the dust removal filter bag body is flatly unfolded, preventing dust accumulation or filtration blind spots caused by wrinkles, ensuring uniform distribution of the dust layer, maintaining an efficient filtration state. A number of attachment holes penetrating both sides are opened on the surface of the catalytic plate, and the nano-catalyst is loaded into the attachment holes, and the flue gas passing through the catalytic honeycomb holes reacts with the catalyst.

[0017] By setting the limit clamping strip, the entire dust removal filter bag body is limited and clamped at the edge position of the inlet of the flower plate hole through the limit clamping strip, ensuring the sealing of the bag mouth of the dust removal filter bag body. When the dust removal filter bag body needs to be replaced, it can be directly pulled out, simplifying the installation and disassembly steps.

[0018] By setting the spiral guide vane, the flue gas deflects to form a swirl through the spiral guide vane, increasing the tangential velocity of the flue gas. At the same time, the coarse particles slide to the bottom due to the centrifugal force hitting the surface wall of the gradient filtration layer, reducing the dust load on the surface layer of the gradient filtration layer.

[0019] By setting the hydrophobic layer, the hydrophobic layer is used to imitate the micro-nano structure of the lotus leaf surface, so that its surface has superhydrophobic properties, reducing water vapor adsorption, preventing dust from absorbing moisture and caking. At the same time, the hydrophobic barrier will prevent acidic droplets from penetrating and corroding the surface of the anti-corrosion surface layer, thereby increasing the service life of the anti-corrosion surface layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present invention and, together with the specification, are further used to explain the principles of the present invention and enable those skilled in the relevant art to implement and use the present invention.

[0021] Figure 1 Schematic diagram of the three-dimensional structure of the environmental protection dust removal filter bag for waste incineration flue gas; Figure 2 Schematic diagram of the three-dimensional structure of the cut-open environmental protection dust removal filter bag for waste incineration flue gas; Figure 3 Schematic diagram of the three-dimensional structure of the cut-open assembly of the gradient filtration layer and the air guiding structure; Figure 4 Schematic diagram of the three-dimensional structure of the cut-open air guiding structure; Figure 5 Schematic diagram of the three-dimensional structure of the decomposition of the catalytic function layer and the catalytic structure; Figure 6 Schematic diagram of the three-dimensional structure of the cut-open catalytic structure; Figure 7 For Figure 6 Schematic diagram of the three-dimensional structure at position A in Figure 8 Schematic diagram of the three-dimensional structure of the anti-corrosion surface layer; Figure 9 For Figure 8 Schematic diagram of the three-dimensional structure at position B in

[0022] Reference numerals: 1. Dust removal filter bag body; 11. Gradient filtration layer; 111. Gradient ring holes; 12. Catalytic function layer; 13. Anti-corrosion surface layer; 131. Hydrophobic layer; 1311. Micro-nano bumps; 14. Catalytic structure; 141. Limit clamping strip; 1411. Pressing section; 1412. Clamping section; 1413. Deformation section; 142. Support tube; 143. Catalytic plate; 144. Annular plate; 145. Guide ring; 146. Catalytic honeycomb holes; 147. Partition groove; 148. Catalytic clamping groove; 15. Air guiding structure; 151. Spiral guide vane; 152. Air guiding disc; 1521. First air guiding section; 1522. Second air guiding section; 1523. Third air guiding section.

[0023] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are marked in the figure, but this is only for schematic needs and is not intended to limit the present invention to this specific structure, device and environment. Those of ordinary skill in the art can adjust or modify these devices and environments according to specific needs. Detailed implementation manners

[0024] The following describes in detail a kind of environmental protection dust removal filter bag for waste incineration flue gas provided by the present invention in combination with the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specifically describing the embodiments and are not intended to specifically limit the present invention.

[0025] It should be noted that in the specification, references to "one embodiment", "an embodiment", "exemplary embodiments", "some embodiments", etc. indicate that the described embodiments may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Additionally, when a particular feature, structure, or characteristic is described in connection with an embodiment, implementing such feature, structure, or characteristic in connection with other embodiments (whether or not explicitly described) should be within the knowledge of those skilled in the relevant art.

[0026] Generally, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood to not necessarily be intended to convey a set of exclusive factors, but rather, depending at least in part on the context, can alternatively allow for the existence of other factors that are not necessarily explicitly described.

[0027] It can be understood that the meanings of "on", "above", and "over" in the present invention should be construed in the broadest manner such that "on" not only means "directly on" something, but also includes the meaning of being "on" something with intervening features or layers therebetween, and "above" or "over" not only means "above" or "over" something, but also can include the meaning of being "above" or "over" something with no intervening features or layers therebetween.

[0028] Furthermore, spatial relative terms such as "under", "below", "lower", "above", "upper", etc. are used herein for convenience of description to describe the relationship of one element or feature to another or other elements or features, as shown in the figures. The spatial relative terms are intended to cover different orientations in the use or operation of the device in addition to the orientation depicted in the figures. The device may be otherwise oriented, and the spatial relative descriptors used herein may be interpreted accordingly.

[0029] As Figures 1 to 9As shown in the figure, an embodiment of the present invention provides an environmental protection dust removal filter bag for waste incineration flue gas, which includes a dust removal filter bag body 1; the dust removal filter bag body 1 is fixedly connected in sequence by a gradient filtration layer 11, a catalytic function layer 12, and an anti-corrosion surface layer 13. Through the three-layer composite structure of the gradient filtration layer 11, the catalytic function layer 12, and the anti-corrosion surface layer 13, and the pore diameters on the three-layer composite structure decrease in sequence, the ultra-low emission of PM2.5 is achieved, and the physical interception and chemical purification of waste incineration flue gas are coordinated. The gradient filtration and catalytic function are integrated into the dust-proof filter bag 1 to solve the problem of co-treatment of multiple pollutants and intercept a large amount of dust and fly ash contained in the waste incineration flue gas; a catalytic structure 14 is arranged inside the catalytic function layer 12 to support the dust removal filter bag body 1 and catalytically decompose the harmful gases passing through at the same time; a gas guiding structure 15 is arranged at the bottom of the gradient filtration layer 11 to make the flue gas generate a swirl, so that the coarse particles in the flue gas settle in advance and reduce the dust load on the surface of the gradient filtration layer 11.

[0030] As Figure 1 and Figure 2 shown, the catalytic function layer 12 is made of a glass fiber substrate, its pore diameter is 5-10 microns, the outer shape of the catalytic function layer 12 is adapted to the catalytic structure 14, and a gap extending from the top to the bottom is opened at the top of the catalytic function layer 12 for inserting the catalytic structure 14. The top gap of the catalytic function layer 12 is sealed and sewn with PTFE monofilament sutures with a certain material, and the sewing density is ≥12 stitches / cm to avoid the situation that conventional sutures are easily melted at high temperatures and cause bag rupture.

[0031] As Figures 5 to 7As shown, the catalytic structure 14 includes a support unit for support and a catalytic unit for catalyzing harmful gases; the support unit includes a support tube 142 located at the bottom of the catalytic functional layer 12. The support tube 142 is used to support the entire catalytic functional layer 12, and thus provides physical support for the entire dust removal filter bag body 1, ensuring that the surface of the dust removal filter bag body 1 is smoothly unfolded, preventing dust accumulation or filtration blind spots caused by wrinkles, ensuring uniform distribution of the dust layer, and maintaining an efficient filtration state. A number of catalytic honeycomb holes 146 distributed in a straight line are formed on the support tube 142. The catalytic honeycomb holes 146 provide reaction channels for the flue gas for incineration and the catalytic plate 143. Every two adjacent catalytic honeycomb holes 146 form a group, and a partition groove 147 is formed between every two adjacent groups. A catalytic card slot 148 is formed at the bottom of the support tube 142. The catalytic card slot 148 and the catalytic plate 143 are connected by an insertion method. The depth of the catalytic card slot 148 is slightly less than the length of the support tube 142. A limit card strip 141 is fixedly connected to the top end of the support tube 142. When the dust removal filter bag body 1 is installed in the flower plate hole, the entire dust removal filter bag body 1 is limited and clamped at the entrance edge position of the flower plate hole through the limit card strip 141, ensuring the sealing of the bag mouth of the dust removal filter bag body 1. When the dust removal filter bag body 1 needs to be replaced, it can be directly pulled out, simplifying the installation and disassembly steps; the catalytic unit includes a guiding ring 145 that fits against the bottom of the support tube 142. One side of the guiding ring 145 is fixedly connected with an annular plate 144. A number of catalytic plates 143 distributed in a ring are fixedly connected to one side of the annular plate 144. A number of through holes are formed on the surface of the catalytic plate 143 on both sides thereof. The nano V2O5-WO3 / TiO2 catalyst is loaded into the attachment holes at a ratio of 5wt%. A number of catalytic plates 143 correspond to a number of catalytic honeycomb holes 146 one by one. The guiding ring 145 is in a semi-circular ring structure. The semi-circular ring structure of the guiding ring 145 is used to limit the bottom end of the support tube 142, avoiding the problem that it is inconvenient to take out the entire catalytic plate 143 after it is inserted into the catalytic card slot 148. The support tube 142 and the guiding ring 145 are slidably connected through the catalytic card slot 148 and the catalytic plate 143.

[0032] The limit clamping strip 141 is composed of a number of elastic cards distributed in a ring shape; the elastic cards are fixedly connected in sequence by a pressing section 1411, a clamping section 1412, and a deformation section 1413. The bottom of the deformation section 1413 is fixedly connected to the top of the support pipe 142. The top of the deformation section 1413 is fixedly connected to the clamping section 1412, and the top of the clamping section 1412 is fixedly connected to the pressing section 1411. The pressing section 1411 is arranged parallel to the support pipe 142. The clamping section 1412 is a concave arc structure, and the deformation section 1413 is an arc structure. When installing the dust removal filter bag body 1, first insert the bottom of the dust removal filter bag body 1 into the inside of the plate hole until the deformation section 1413 contacts the orifice of the plate hole, and then continuously press the pressing section 1411. After the deformation section 1413 is subjected to the extrusion force, it is compressed and deformed inward by the orifice until the clamping section 1412 is engaged with the edge position of the orifice, so as to limit and fix the dust removal filter bag body 1.

[0033] As Figure 1 and Figure 3 shown, the material of the gradient filter layer 11 is PPS / P84 blended fiber, which is woven into an interlaced fiber mesh structure. The PPS fiber and the P84 fiber are blended in a mass ratio of 7:3. The PPS / P84 blended fiber is laid by a double carding machine and adopts a stepped hot pressing process. Its pore diameter is 20-50 microns. The outer wall of the gradient filter layer 11 is fixedly connected to the inner wall of the catalytic function layer 12 in a matching manner; a number of gradient ring holes 111 are formed in the inner wall of the gradient filter layer 11. The gradient ring holes 111 are in the shape of a trapezoidal cross-section fold, and the depths of the number of gradient ring holes 111 increase from the bag mouth to the bag bottom. Through the number of gradient ring holes 111, the filtration area is increased by 40%, and at the same time, the backwashing dead angle is avoided.

[0034] As Figure 3 and Figure 4As shown in the figure, the air guiding structure 15 includes an air guiding disc 152 connected to the bottom of the gradient filtering layer 11. A number of spiral guiding vanes 151 distributed in a ring are fixedly connected to the inner wall of the air guiding disc 152. The air guiding disc 152 is formed by connecting a first air guiding section 1521, a second air guiding section 1522, and a third air guiding section 1523. The first air guiding section 1521 is a bowl-shaped structure. The bottom of the first air guiding section 1521 is fixedly connected to the second air guiding section 1522 in a concave shape. One end of the second air guiding section 1522 is fixedly connected to the third air guiding section 1523 in an outward-turning shape. The bottom of the second air guiding section 1522 is fixedly connected to the bottom of the gradient filtering layer 11. The outer surface wall of the third air guiding section 1523 is fixedly connected to the inner surface wall of the gradient filtering layer 11. The high-temperature resistant adhesive silicone glue is fixed on the inner wall of the filter bag. The flue gas is shunted by the first air guiding section 1521. The shunted flue gas moves towards the surface wall direction of the gradient filtering layer 11 under the guidance of the second air guiding section 1522 and the third air guiding section 1523. At the same time, when the flue gas enters the bottom of the gradient filtering layer 11, the spiral guiding vanes 151 cause the flue gas to deflect and form a swirling flow, increasing the tangential velocity of the flue gas. At the same time, the coarse particles hit the surface wall of the gradient filtering layer 11 due to centrifugal force and slide to the bottom, reducing the dust load on the surface layer of the gradient filtering layer 11.

[0035] As Figure 1 , Figure 8 and Figure 9 shown in the figure, the anti-corrosion surface layer 13 is made of PTFE coating material, and its pore diameter is 0.1 - 0.5 microns. Hydrophobic layers 131 are provided on both the inner surface wall and the outer surface wall of the anti-corrosion surface layer 13. Micro-nano bumps 1311 with a symmetric gradient pore structure are provided on the surface wall of the hydrophobic layer 131 to imitate the micro-nano structure of the lotus leaf surface, making its surface have super-hydrophobic performance, reducing water vapor adsorption, preventing dust from absorbing moisture and caking. At the same time, the hydrophobic barrier will prevent acidic droplets from penetrating and corroding the surface of the anti-corrosion surface layer 13, thereby increasing the extended life of the anti-corrosion surface layer 13.

[0036] The working principle of the technical solution provided by the present invention is as follows: First, install the catalytic structure 14. Insert the catalytic plate 143 attached with the V2O5-WO3 / TiO2 catalyst into the catalytic card slot 148. Then insert the catalytic card slot 148 with the installed catalytic plate 143 into the gap on the catalytic functional layer 12. Then use PTFE monofilament sutures as the material for sealing and sewing.

[0037] Install the dust removal filter bag body 1. First, insert the bottom of the dust removal filter bag body 1 into the inside of the flower plate hole until the deformation section 1413 contacts the orifice of the flower plate hole. Then continuously press the pressing section 1411. After the deformation section 1413 is subjected to the extrusion force, it is compressed and deformed inward by the extrusion with the orifice until the clamping section 1412 is engaged with the edge position of the orifice, thereby limiting and fixing the dust removal filter bag body 1. Then restore the water spray pipe to its original position, tighten the screws, and cover the cover door.

[0038] The present invention encompasses any alternatives, modifications, equivalent methods, and solutions made within the spirit and scope of the present invention. To enable the public to have a thorough understanding of the present invention, specific details are described in detail in the following preferred embodiments of the present invention. However, those skilled in the art can fully understand the present invention without such detailed descriptions. Additionally, well-known methods, processes, procedures, components, and circuits are not described in detail to avoid unnecessary confusion to the essence of the present invention.

[0039] The above description is only a preferred embodiment 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 refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A garbage incineration flue gas environmental protection dust removal filter bag, characterized in that: include: Dust filter bag body; The dust filter bag body is composed of a gradient filter layer, a catalytic functional layer and an anti-corrosion surface layer which are fixedly connected in sequence, and is used to intercept a large amount of dust and fly ash contained in the flue gas of garbage incineration; A catalytic structure, which is arranged inside the catalytic functional layer, is used to support the dust filter bag body and catalytically decompose the harmful gas passing therethrough; The air guide structure is arranged at the bottom of the gradient filter layer and is used to make the smoke produce a swirl flow, so that the coarse particles in the smoke settle in advance and reduce the dust load on the surface of the gradient filter layer.

2. The environmentally friendly dust removal filter bag for waste incineration flue gas according to claim 1 is characterized in that: The material of the catalytic functional layer is a glass fiber substrate with a pore size of 5-10 microns. The shape of the catalytic functional layer is adapted to the catalytic structure. A gap extending to the bottom is provided on the top of the catalytic functional layer for inserting the catalytic structure. The top gap of the catalytic functional layer is sealed and sewn with PTFE monofilament suture made of .

3. The environmentally friendly dust removal filter bag for waste incineration flue gas according to claim 1 is characterized in that: The catalytic structure includes a supporting unit for supporting and a catalytic unit for catalyzing harmful gases; The support unit includes a support tube located at the bottom of the catalytic functional layer, a plurality of catalytic honeycomb holes distributed in a straight line are provided on the support tube, every two adjacent catalytic honeycomb holes form a group, a partition groove is provided between every two adjacent groups, a catalytic card groove is provided at the bottom of the support tube, the depth of the catalytic card groove is slightly smaller than the length of the support tube, and a limiting card strip is fixedly connected to the top of the support tube.

4. The environmentally friendly dust removal filter bag for waste incineration flue gas according to claim 3 is characterized in that: The catalytic unit includes a guide ring that fits with the bottom of the support tube, one side of the guide ring is fixedly connected to a ring plate, one side of the ring plate is fixedly connected to a plurality of catalytic plates distributed in a ring shape, the plurality of catalytic plates correspond one to one with a plurality of catalytic honeycomb holes, the guide ring is a semicircular ring structure, and the support tube and the guide ring are slidably connected via a catalytic slot and a catalytic plate.

5. The environmentally friendly dust removal filter bag for waste incineration flue gas according to claim 3 is characterized in that: The limit card strip is composed of a plurality of elastic cards distributed in a ring shape; The elastic card is composed of a pressing section, a clamping section and a deformation section which are fixedly connected in sequence. The bottom of the deformation section is fixedly connected to the top of the support tube, the top of the deformation section is fixedly connected with the clamping section, the top of the clamping section is fixedly connected with the pressing section, the pressing section is arranged parallel to the support tube, the clamping section is an inwardly concave arc structure, and the deformation section is an arc structure.

6. The environmentally friendly dust removal filter bag for waste incineration flue gas according to claim 1 is characterized in that: The material of the gradient filter layer is PPS / P84 blended fiber, which is woven into an interlaced fiber mesh structure with a pore size of 20-50 microns. The outer surface wall of the gradient filter layer is adapted and fixedly connected to the inner surface wall of the catalytic functional layer; The inner wall of the gradient filter layer is provided with a plurality of gradient ring holes, the gradient ring holes are in a trapezoidal cross-section fold shape, and the depths of the plurality of gradient ring holes increase gradually from the bag opening to the bag bottom.

7. The environmentally friendly dust removal filter bag for waste incineration flue gas according to claim 1 is characterized in that: The air guide structure comprises an air guide plate connected to the bottom of the gradient filter layer, and the inner wall of the air guide plate is fixedly connected with a plurality of spiral guide plates distributed in an annular shape.

8. The environmentally friendly dust removal filter bag for waste incineration flue gas according to claim 7 is characterized in that: The air guide plate is formed by connecting a first air guide segment, a second air guide segment and a third air guide segment. The first air guide segment is a bowl-shaped structure. The bottom of the first air guide segment is fixedly connected to a second air guide segment with an inward concave shape. One end of the second air guide segment is fixedly connected to a third air guide segment with an outward-turned shape. The bottom of the second air guide segment is fixedly connected to the bottom of the gradient filter layer, and the outer wall of the third air guide segment is fixedly connected to the inner wall of the gradient filter layer.

9. The environmentally friendly dust removal filter bag for waste incineration flue gas according to claim 1, characterized in that: The material of the anti-corrosion surface layer is PTFE coated material, the pore size of which is 0.1-0.5 microns, and the inner surface wall and the outer surface wall of the anti-corrosion surface layer are both provided with a hydrophobic layer.

10. The environmentally friendly dust removal filter bag for waste incineration flue gas according to claim 9, characterized in that: The surface wall of the hydrophobic layer is provided with micro-nano protrusions with symmetrical gradient pore structures, which are used to imitate the micro-nano structure of the lotus leaf surface, so that the surface has super hydrophobic properties.

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