Cylindrical multifunctional filtering structure
By introducing the connection method of the catalytic membrane and the shrinkage segment into the metal filter bag, the problem of synchronous treatment of dust and harmful gases in high temperature environments is solved, efficient and low-cost flue gas purification and dust removal are achieved, and the connection process is simplified.
Patent Information
- Application Number
- CN202422093664.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-08-28
AI Technical Summary
It is difficult for existing metal filter bags to achieve efficient interception and purification of dust and harmful gases at the same time in high-temperature environments, and the connection parts are costly and difficult, and cannot maintain roundness, and require multiple equipment to be processed in segments.
The double-membrane filter cartridge structure of the pore tube and catalytic membrane is adopted from the inside to the outside. The catalytic membrane is attached to the solid catalyst, and the filter bag section is connected through the shrinking segment interpolation and circumferential welding. Combined with the circumferential laser and resistive roller welding process, high-efficiency filtration and catalytic purification are achieved.
It realizes synchronous dust removal and purification of flue gas in high temperature environments, reduces material and equipment costs, improves the stability and service life of the catalyst, simplifies the connection process, and prevents gas escape.
Smart Images
Figure CN223112631U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of metal filter bags, in particular to a cylindrical multi-functional filtering structure. Background Art
[0002] Metal filter bags are a kind of filtering materials used for high-temperature flue gas dust removal. They are mainly made of metal materials such as metal fibers or metal alloy powders, and are made into intermetallic compound porous filtering materials after pressing and sintering. They can replace non-metal high-temperature-resistant filter bags, have the characteristics of high temperature resistance, strong acid and alkali resistance, high mechanical strength, and certain flexibility, and can solve the problem of high-precision interception of dust particles in high-temperature industrial flue gas. They are usually used in industries such as metallurgy, coal combustion, alumina, steel, cement, glass, non-ferrous metallurgy, and waste incineration to achieve dust removal and gas-solid separation of flue gas in high-temperature environments.
[0003] A metal filter bag generally consists of a hole tube 1 located inside and a metal film 2 coated on the surface of the hole tube a. Since the metal filter bag has a certain flexibility, when the application scenario has certain requirements for the length of the filter bag, it is necessary to use connectors to splice multiple sections of metal filter bags into a complete filter bag product to avoid the problem of insufficient support strength. See Figure 1 , in the prior art, a filter bag section is composed of a hole tube 1 of a certain length and a metal film 2, and a first end pipe joint 3 and a second end pipe joint 4 made of metal are arranged between adjacent filter bag sections. The first end pipe joint 3 and the second end pipe joint 4 are respectively fixedly connected to the corresponding filter bag sections, and the first end pipe joint 3 is fixedly connected to the second end pipe joint 4. The fixed connection method is riveting or welding. Among them, the hole tube 1 on the left, the first end pipe joint 3 and the second end pipe joint 4, and the second end pipe joint 4 and the hole tube 1' on the right are all inserted and matched through a stepped structure. The disadvantages are as follows: (1) Both the first end pipe joint 3 and the second end pipe joint 4 are machined parts, and the cost is relatively high; (2) The cooperation between the first end pipe joint 3 and the second end pipe joint 4 and the hole tubes 1 and 1' is relatively difficult, and the insertion is troublesome. Moreover, since the thickness of the hole tubes 1 and 1' is only 0.65 - 0.70 mm, after spiral welding, the roundness of the metal filter bag deforms greatly and cannot maintain the original designed circular cross-section; (3) This metal filter bag can only intercept dust in the flue gas and cannot purify specific harmful gases in the flue gas. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a cylindrical multi-functional filtering structure, solve the problems existing in the prior art, be applicable to dust removal and purification of flue gas in high-temperature environments, and be able to simplify the connection process.
[0005] To achieve the above purpose, the solution of the utility model is:
[0006] A cylindrical multi-functional filtering structure includes two adjacent cylindrical filter bag sections and a connecting component for connecting the two filter bag sections; each filter bag section includes a pore tube, a catalytic membrane, and a metal membrane arranged layer by layer from the inside to the outside, and a solid catalyst is attached to the catalytic membrane; the connecting component includes a first end pipe joint and a second end pipe joint with their ends connected; one end of the first end pipe joint is provided with a first reduced-diameter section, and the two ends of the second end pipe joint are respectively provided with a second reduced-diameter section and a third reduced-diameter section; the first reduced-diameter section and the third reduced-diameter section are respectively inserted into the ends of the pore tubes of the two filter bag sections, and the second reduced-diameter section is inserted into the other end of the first end pipe joint; the inner walls of the ends of the metal membranes of the two filter bag sections are respectively welded to the circumferences of the first end pipe joint and the second end pipe joint, and the end faces of the pore tubes of the two filter bag sections are respectively welded to the reduced-diameter inclined surfaces of the first reduced-diameter section and the third reduced-diameter section.
[0007] High-temperature resistant sealant is provided between the end face of the catalytic membrane and the circumference of the pore tube.
[0008] The inner wall of the end of the metal membrane fits to the circumference of the first end pipe joint or the second end pipe joint, and welding is achieved by using the circumferential resistance roll welding process.
[0009] The end face of the pore tube abuts against the reduced-diameter inclined surface of the first reduced-diameter section or the reduced-diameter inclined surface of the third reduced-diameter section, and welding is achieved by using the circumferential laser welding process.
[0010] The end face of the other end of the first end pipe joint abuts against the reduced-diameter inclined surface of the second reduced-diameter section, and welding is achieved by using the circumferential laser welding process.
[0011] The thickness of the catalytic membrane is greater than the thickness of the metal membrane, and the pore diameter of the catalytic membrane is greater than the pore diameter of the metal membrane.
[0012] The catalytic membrane is selected from nickel foam, stainless steel foam or metal felt.
[0013] After adopting the above technical solution, the utility model has the following technical effects:
[0014] (1) The utility model adopts a double-membrane filter cartridge structure of a metal membrane plus a catalytic membrane, which can not only filter particulate dust in the flue gas, but also catalytically treat harmful gases in the flue gas. Especially, the solid catalyst attached to the catalytic membrane 5 in a high-temperature environment can generate a catalytic reaction with the harmful gas in a very short time and convert it into a gas with a lower harmful level or even harmless gas, realizing simultaneous dust removal and purification of the flue gas, with rich functions. Compared with the method of using multiple devices for segmented treatment in the prior art, it can save material costs and equipment costs;
[0015] (2) The catalytic membrane is located inside the metal membrane. The solid catalyst is not easily dropped under the wrapping of the two membranes, and the catalytic effect is stable and the effective time is long.
[0016] (3) In terms of the connection method of adjacent filter bag sections, the present utility model adopts a reduced-diameter insertion type. The reduced-diameter section of the end pipe joint can be formed by processes such as roll pressing. The production process is simple and the cost is low. Moreover, during assembly, the insertion difficulty is reduced, and a gapless fit between the hole pipe and the reduced-diameter section of the end pipe joint is ensured, which can prevent flue gas dust and harmful gases from escaping from the gap. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a schematic structural diagram of the prior art;
[0018] Figure 2 is a schematic structural diagram of a specific embodiment of the present utility model;
[0019] Figure 3 is a schematic diagram of the present invention for carrying out slurry coating treatment on the catalytic membrane;
[0020] Figure 4 is an enlarged partial structural diagram of the slurry coater used in the present invention;
[0021] Figure 5 is a schematic diagram of the present invention for assembling the catalytic membrane;
[0022] DESCRIPTION OF THE REFERENCE NUMERALS IN THE DRAWINGS:
[0023] 1 - hole pipe; 2 - metal membrane; 3 - first end pipe joint; 31 - first reduced-diameter section; 311 - reduced-diameter inclined surface; 4 - second end pipe joint; 41 - second reduced-diameter section; 411 - reduced-diameter inclined surface; 42 - third reduced-diameter section; 421 - reduced-diameter inclined surface; 5 - catalytic membrane; 6 - high-temperature sealant; 7 - stainless steel wire mesh; 71 - welding edge; 10 - slurry coater; 101 - grouting mold; 1011 - channel opening; 1012 - flared opening; 1013 - rubber sheet; 1014 - slurry inlet; 1015 - shunt cavity; 1016 - shunt opening; 102 - slurry tank; 103 - peristaltic pump; 104 - stirring roller; 20 - air inflation shaft; 30 - workbench; 40 - welding head. SPECIFIC EMBODIMENTS
[0024] In order to further explain the technical solution of the present utility model, the present utility model will be elaborated in detail below through specific embodiments.
[0025] Referring to Figure 2 As shown, the present utility model discloses a cylindrical multi-functional filtering structure, including two adjacent cylindrical filter bag sections, and a connection component for connecting the two filter bag sections;
[0026] The filter bag section includes a hole tube 1, a catalytic membrane 5, and a metal membrane 2 arranged layer by layer from the inside to the outside. The catalytic membrane 5 is attached with a solid catalyst.
[0027] The connecting component includes a first end pipe joint 3 and a second end pipe joint 4 whose ends are connected. One end of the first end pipe joint 3 is provided with a first reduced diameter section 31, and the two ends of the second end pipe joint 4 are respectively provided with a second reduced diameter section 41 and a third reduced diameter section 42. The first reduced diameter section 31 and the third reduced diameter section 42 are respectively inserted into the ends of the hole tubes 1 of two filter bag sections, and the second reduced diameter section 41 is inserted into the other end of the first end pipe joint 3.
[0028] The inner walls of the ends of the metal membranes 2 of the two filter bag sections are respectively welded to the circumferences of the first end pipe joint 3 and the second end pipe joint 4, and the end faces of the hole tubes 1 of the two filter bag sections are respectively welded to the reduced diameter inclined surfaces 311 and 421 of the first reduced diameter section 31 and the third reduced diameter section 42.
[0029] Through the above scheme, the utility model adopts a double - membrane filter cartridge structure of a metal membrane 2 plus a catalytic membrane 5, which can not only filter particulate dust in the flue gas but also catalytically treat harmful gases in the flue gas. Especially, the solid catalyst attached to the catalytic membrane 5 in a high - temperature environment can generate a catalytic reaction with harmful gases in a very short time and convert them into gases with a lower or even harmless harmful level, realizing simultaneous dust removal and purification of the flue gas, with rich functions. Compared with the way of using multiple devices for segmented treatment in the prior art, it can save material costs and equipment costs; the catalytic membrane 5 is located inside the metal membrane 2, and the solid catalyst is not easy to fall off under the wrapping of the two membranes, with stable catalytic effect and long effective time; in the connection method of adjacent filter bag sections, the utility model adopts a shrink - mouth insertion type. The reduced diameter sections of the end pipe joints can be formed by processes such as roll pressing, with simple production process and low cost, reducing the insertion difficulty during assembly, and ensuring a gap - free fit between the hole tube 1 and the reduced diameter section of the end pipe joint, which can prevent the escape of flue gas dust and harmful gases from the gap.
[0030] The following shows specific embodiments of the utility model.
[0031] The thickness of the above - mentioned catalytic membrane 5 is greater than the thickness of the metal membrane 2, and the pore diameter of the catalytic membrane 5 is greater than the pore diameter of the metal membrane 2, which can increase the catalytic time of the catalytic membrane 5 and improve the efficiency of purifying harmful gases.
[0032] High - temperature resistant sealant 6 is provided between the end face of the above - mentioned catalytic membrane 5 and the circumferential surface of the hole tube 1 to achieve end sealing of the catalytic membrane 5 and prevent the escape of harmful gases.
[0033] The inner wall of the end of the above - mentioned metal membrane 2 is attached to the circumferential surface of the first end pipe joint 3 or the second end pipe joint 4, and welding is achieved by circumferential resistance roll welding process.
[0034] The end face of the above-mentioned hole tube 1 abuts against the reduced-diameter inclined surface 311 of the first reduced-diameter section 31 or the reduced-diameter inclined surface 421 of the third reduced-diameter section 42, and the welding is realized by using the circumferential laser welding process.
[0035] The end face of the other end of the above-mentioned first end tube joint 3 abuts against the reduced-diameter inclined surface 411 of the second reduced-diameter section 41, and the welding is realized by using the circumferential laser welding process.
[0036] The above-mentioned catalytic membrane 5 is made of corrosion-resistant metal materials such as nickel foam, stainless steel foam, and metal felt, and has a three-dimensional honeycomb network structure to ensure sufficient air permeability and softness. The solid catalyst is more easily extruded into the network structure, combined with the network structure, and wrapped by the ribs of the network structure to increase the adhesion time of the solid catalyst, thereby ensuring the effective life of the product.
[0037] The solid catalyst attached to the above-mentioned catalytic membrane 5 is a type of catalyst existing in the solid phase and can be selected according to different application scenarios (for different flue gas components). The solid catalysts are classified according to the types of active substances, including:
[0038] ① Single-component metal oxides: This type of catalyst includes oxides of alkali metals, alkaline earth metals, and rare metals, such as ThO2, ZrO2, ZnO2, TiO2, etc.;
[0039] ② Metal catalysts: Composed of a single metal or metal alloy, such as platinum, palladium, and nickel, these catalysts are widely used in reactions such as hydrogenation, oxidation, and dehydrogenation;
[0040] ③ Metal oxide catalysts: Composed of metal oxides or mixtures of metal oxides, such as alumina, silica, and titanium dioxide, they are commonly used in oxidation, reduction, and decomposition reactions;
[0041] ④ Zeolite catalysts: Composed of microporous crystalline materials, such as ZSM-5 and Y-zeolite, and are widely used in cracking, isomerization, and alkylation reactions;
[0042] ⑤ Supported catalysts: Composed of metals or metal oxides deposited on a high-surface-area support material, such as platinum supported on alumina and palladium supported on carbon, these catalysts are used in various reactions such as hydrogenation, oxidation, and reforming;
[0043] ⑥ Bifunctional catalysts: Catalysts containing two or more active sites with different functions, such as metal acid catalysts and metal base catalysts, and are used in reactions such as hydrocracking, hydroisomerization, and hydrodesulfurization.
[0044] The present utility model also discloses a production method of a cylindrical multi-functional filtering structure, including the following steps:
[0045] Step 1, refer to Figure 3For the catalytic membrane 5, after the doctor blade coating treatment is performed on it using a doctor blade coater 10, a drying treatment is then carried out. Among them, the catalytic membrane 5 sequentially passes through the grouting die 101 and the slurry tank 102 of the doctor blade coater 10. The grouting die 101 is filled with a slurry containing a solid catalyst. A peristaltic pump 103 is arranged between the grouting die 101 and the slurry tank 102. The peristaltic pump 103 extracts the slurry from the slurry tank 102 and pumps it into the grouting die 101 under high pressure, so that the slurry in the grouting die 101 forms a certain pressure, which can squeeze out the air in the catalytic membrane 5 passing through the grouting die 101 and let the solid catalyst be squeezed into the three-dimensional honeycomb network structure of the catalytic membrane 5, improving the adhesion rate of the solid catalyst. It can be understood that the larger the inner cavity of the grouting die 101, the longer the time for pressing the pressurized slurry into the catalytic membrane 5, and the adhesion rate of the solid catalyst will also increase accordingly.
[0046] Step 2: According to the dimensional requirements of the product design, the dried catalytic membrane 5 with the solid catalyst attached is wound up and cut.
[0047] Step 3: Since the catalytic membrane 5 itself is relatively soft and has low strength, and there are solid catalysts attached to both its surface and interior, which has a great impact on its welding performance, it is impossible to use the processing method of traditional metal flexible membranes to assemble the hole tube 1 and the catalytic membrane 5. Therefore, the present invention adopts a new idea. Refer to Figure 5 , first, the hole tube 1 is sleeved on the air expansion shaft 20 of the seam welder; then, the catalytic membrane 5 and the stainless steel wire mesh 7 are sequentially stacked on the workbench 30 of the seam welder. Welding edges 71 that extend beyond the side edges of the catalytic membrane 5 are reserved on both sides of the stainless steel wire mesh 7. The seam welder is started, and the welding head 40 welds the welding edge 71 on one side of the stainless steel wire mesh 7 to the hole tube 1. Then, the air expansion shaft 20 rotates to make the catalytic membrane 5 wrap around the hole tube 1 for at least one circle, and the welding head 40 welds the other welding edge 71 to the surface of the stainless steel wire mesh 7.
[0048] Step 4: The first end pipe joint 3 or the second end pipe joint 4 is inserted into the end of the hole tube 1 and subjected to rolling welding.
[0049] Step 5: The metal membrane 2 is rolled into a cylindrical shape and longitudinally welded, and then sleeved on the circumferential surface of the hole tube 1 and subjected to rolling welding with the corresponding end pipe joint.
[0050] Step 6: The first end pipe joint 3 and the second end pipe joint 4 of the paired filter bag sections are inserted and then subjected to rolling welding.
[0051] In the above step 1, a plurality of stirring rollers 104 are installed in the slurry tank 102 of the doctor blade coater 10. The axial direction of the stirring rollers 104 is parallel to the width direction of the catalytic membrane 5. By arranging the stirring rollers 104, the solid catalyst in the slurry tank 102 can be more evenly distributed in the slurry.
[0052] Refer to Figure 4, in the above step 1, a flaring mouth 1012 is provided inside the channel opening 1011 for the catalytic film 5 to enter and exit the grouting mold 101, and rubber sheets 1013 are provided on both sides of the flaring mouth 1012. A dynamic seal is formed between the catalytic film 5 and the rubber sheets 1013 when the catalytic film 5 enters and exits the grouting mold 101. By providing the rubber sheets 1013, the following functions are achieved: ① enabling the effective passage of the catalytic film without damaging the product; ② effectively establishing a certain pressure of the slurry inside the grouting mold 101; ③ when the pressure of the slurry inside the mold is too high, the rubber sheets 1013 will bend outward under the action of the pressure through the space provided by the flaring mouth 1012, making the gap between the two rubber sheets 1013 larger and discharging the slurry faster to achieve pressure reduction; ④ acting like a squeegee to effectively control the thickness of the slurry at the outlet of the grouting mold 101.
[0053] Meanwhile, in the above step 1, slurry inlets 1014 are provided on both sides of the grouting mold 101, and both slurry inlets 1014 are communicated with the output end of the peristaltic pump 103; two flow dividing cavities 1015 communicated with the two slurry inlets 1014 respectively are provided inside the grouting mold 101. The two flow dividing cavities 1015 are symmetrically arranged on both inner sides of the grouting mold 101, and each flow dividing cavity 1015 is provided with a plurality of flow dividing openings 1016. The function of flow distribution is achieved by providing the flow dividing cavities 1015, so that the pumped slurry will not directly spray onto the catalytic film 5, and the slurry can flow evenly in different directions inside the grouting mold 101, ensuring that high pressure is distributed at each position inside the grouting mold 101.
[0054] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by those of ordinary skill in the art shall be regarded as not departing from the patent scope of the present invention.
Claims
1. A cylindrical multi-functional filtering structure, characterized in that: It includes two adjacent cylindrical filter bag sections, and a connecting component for connecting the two filter bag sections; The filter bag section includes a pore tube, a catalytic membrane, and a metal membrane arranged layer by layer from the inside to the outside, and the catalytic membrane is attached with a solid catalyst; The connecting component includes a first end pipe joint and a second end pipe joint connected at the ends; one end of the first end pipe joint is provided with a first reduced-diameter section, and the two ends of the second end pipe joint are respectively provided with a second reduced-diameter section and a third reduced-diameter section; the first reduced-diameter section and the third reduced-diameter section are respectively inserted into the ends of the pore tubes of the two filter bag sections, and the second reduced-diameter section is inserted into the other end of the first end pipe joint; The inner walls of the ends of the metal membranes of the two filter bag sections are respectively welded to the circumferential surfaces of the first end pipe joint and the second end pipe joint, and the end faces of the pore tubes of the two filter bag sections are respectively welded to the reduced-diameter inclined surfaces of the first reduced-diameter section and the third reduced-diameter section.
2. The cylindrical multi-functional filtering structure according to claim 1, characterized in that: A high-temperature resistant sealant is provided between the end face of the catalytic membrane and the circumferential surface of the pore tube.
3. The cylindrical multi-functional filtering structure according to claim 1, characterized in that: The inner wall of the end of the metal membrane fits to the circumferential surface of the first end pipe joint or the second end pipe joint, and the welding is realized by circumferential resistance roll welding process.
4. The cylindrical multi-functional filtering structure according to claim 1, characterized in that: The end face of the pore tube abuts against the reduced-diameter inclined surface of the first reduced-diameter section or the reduced-diameter inclined surface of the third reduced-diameter section, and the welding is realized by circumferential laser welding process.
5. The cylindrical multi-functional filtering structure according to claim 1, characterized in that: The end face of the other end of the first end pipe joint abuts against the reduced-diameter inclined surface of the second reduced-diameter section, and the welding is realized by circumferential laser welding process.
6. The cylindrical multi-functional filtering structure according to claim 1, characterized in that: The thickness of the catalytic membrane is greater than the thickness of the metal membrane, and the pore diameter of the catalytic membrane is greater than the pore diameter of the metal membrane.
7. The cylindrical multi-functional filtering structure according to claim 1, characterized in that: The catalytic membrane is selected from nickel foam, stainless steel foam or metal felt.