Carbon felt with easy dust removal and folding resistance

Abstract

The application relates to the technical field of high-temperature filtering materials, and particularly discloses an easy-to-clean and fold-resistant carbon felt. The carbon felt layer and the stainless steel base cloth layer are formed through a special non-woven fabric processing technology, the stainless steel base cloth layer is woven into a net-shaped structure by a plurality of stainless steel wires, and is uniformly distributed in the carbon felt layer. The application also discloses the use of the carbon felt, which comprises the following steps: S1, combining the carbon felt layer and the stainless steel base cloth layer through the special non-woven fabric processing technology to form a composite carbon felt; S2, cutting the composite carbon felt into a required size and installing the composite carbon felt in a filtering device; S3, regularly introducing a pulse airflow to clean dust during a filtering process; and S4, controlling the pressure and frequency of the pulse airflow during dust cleaning. The carbon felt can be used for high-temperature flue gas filtering, pulse bag-type dust collectors and various industrial dust recycling scenes, has excellent fold-resistant performance and persistent easy-to-clean characteristics, and has the advantage of avoiding dust hardening and paste.

Description

Technical Field

[0001] This application relates to the field of high-temperature filter materials technology, and more specifically, it relates to a carbon felt that is easy to clean and resistant to bending. Background Technology

[0002] In industrial settings such as metallurgy, chemical engineering, and power generation, where ultra-high temperature gas filtration is required, high-temperature filter materials typically exist in the form of ceramic fibers, intermetallic compounds, or porous ceramics. In the metallurgical field, they are used for the purification of flue gas from smelting furnaces and the recovery of high-temperature waste gas in direct contact with molten metal. In the chemical field, they are responsible for intercepting catalyst particles in high-temperature reaction gases and purifying hazardous gases. In the power industry, these materials can achieve high-temperature flue gas dust removal without cooling, avoiding the energy loss and thermal efficiency reduction caused by cooling in traditional processes, and effectively protecting expensive downstream equipment such as high-temperature gas turbines.

[0003] High-temperature filter materials achieve their filtration function through the inherent microporous structure of materials such as ceramic fibers and porous ceramics. However, when faced with intense dust removal operations such as pulse backflushing, these materials generally suffer from insufficient toughness and high brittleness. As a result, they are prone to fiber breakage or microcrack propagation under frequent mechanical impacts. This not only shortens the service life of the filter media, but also causes the intercepted fine dust to become embedded and clump inside or on the surface of the filter media, forming a dense dust layer that is difficult to peel off. Ultimately, this leads to a sharp increase in filtration resistance and dust removal failure. Summary of the Invention

[0004] To address the problem of dust removal failure caused by the use of ceramic fibers, porous ceramics, and other materials in existing high-temperature filter materials, this application provides an easy-to-clean and durable carbon felt.

[0005] This application provides an easy-to-clean and durable carbon felt, using the following technical solution:

[0006] A carbon felt that is easy to clean and durable includes a carbon felt layer and a stainless steel base fabric layer, wherein the carbon felt layer and the stainless steel base fabric layer are composited by a special non-woven fabric processing technology, and the stainless steel base fabric layer is woven from multiple stainless steel wires into a mesh structure and evenly distributed in the carbon felt layer.

[0007] It also includes the use of carbon felt, including the following steps:

[0008] S1. The carbon felt layer and the stainless steel base fabric layer are combined using a special non-woven fabric processing technology to form a composite carbon felt.

[0009] S2. Cut the composite carbon felt to the required size and install it in the filter device;

[0010] S3. During the filtration process, pulsed airflow is periodically introduced for dust removal;

[0011] S4. During dust removal, control the pressure and frequency of the pulse airflow.

[0012] By adopting the above technical solution, due to the composite structure of carbon felt layer and stainless steel base cloth layer, the stainless steel base cloth layer provides continuous mesh skeleton support for carbon felt, enhancing the overall mechanical strength and toughness of the material, enabling carbon felt layer to undergo elastic deformation when impacted by pulsed airflow; at the same time, this expansion and contraction deformation directly acts on the dust layer attached to the surface of carbon felt, which can destroy the dust adhesion structure and cause it to peel off. Therefore, the effect of improving the folding resistance of carbon felt to achieve pulse cleaning and solving the problem of dust caking on the filter surface is achieved.

[0013] Preferably, the stainless steel base fabric layer is made of high-temperature resistant and high-strength stainless steel wire with a diameter of 0.1-0.2 mm and a weaving density of 10-20 mesh.

[0014] By adopting the above technical solution, the use of high-temperature resistant and high-strength stainless steel wire provides high-temperature oxidation resistance and corrosion resistance, making it suitable for environments such as metallurgical and chemical flue gas environments. The selected wire diameter reduces the weight of the base fabric while ensuring strength, and makes it flexible to coordinate with the deformation of the carbon felt layer. The weaving density forms a porous support structure with appropriate mesh size, which can effectively capture and anchor carbon fibers to enhance interlayer bonding without excessively obstructing airflow channels. Therefore, it achieves the effect of maintaining structural integrity in high-temperature corrosive environments and providing uniform and flexible support for the carbon felt layer.

[0015] Preferably, the carbon felt layer is made of polyacrylonitrile-based carbon fiber felt with a density of 0.2 to 0.4 g / cm³, the thickness of the carbon felt layer is 5 to 10 mm, and the mesh size of the stainless steel base fabric layer is 2 to 5 mm.

[0016] By adopting the above technical solution, the polyacrylonitrile-based carbon fiber felt possesses high-temperature resistance and chemical stability; controlling the density within the specified range ensures the felt body has porosity for low-resistance filtration while maintaining fiber packing density to guarantee filtration accuracy; the specified thickness provides space for dust interception and filter cake formation; and the stainless steel base fabric mesh size matches the carbon felt layer thickness and fiber density, ensuring that the stainless steel wire mesh can be fully embedded and support the three-dimensional structure of the carbon felt, resulting in more uniform force transmission during dust removal deformation. Therefore, while ensuring filtration performance, the composite structure achieves a reasonable stress distribution during dust removal deformation, avoiding damage caused by localized stress concentration.

[0017] Preferably, the stainless steel base fabric layer can be replaced with a base fabric woven from nickel-based alloy wires, wherein the nickel-based alloy wires have a diameter of 0.1 to 0.2 mm and a weaving density of 10 to 20 meshes.

[0018] By adopting the above technical solution, and using nickel-based alloy wire as a replacement, nickel-based alloys generally have better high-temperature strength, creep resistance, and oxidation resistance than stainless steel in ultra-high temperature and more corrosive media environments. The range of wire diameter and weaving density remains unchanged, which can ensure that its physical support characteristics are consistent with the original design. Therefore, the effect of expanding the upper limit of the material's applicable temperature and adapting to more severe corrosive environments is achieved.

[0019] Preferably, step S1 further includes a step of pretreating the carbon felt layer: heat-treating the polyacrylonitrile-based carbon fiber felt at a temperature of 200-300°C for 30-60 minutes.

[0020] By adopting the above technical solution, the preheating treatment of carbon fiber felt before lamination can remove moisture and low-molecular-weight volatiles adsorbed by the carbon felt during storage and transportation, reducing the delamination or defects caused by the generation of gas during subsequent high-temperature lamination or use. Heat treatment can make the surface structure of carbon fiber more stable, which is conducive to forming a strong interfacial bond through special nonwoven fabric processing technology. Therefore, the effect of improving the dimensional stability of carbon felt layer, improving interfacial compatibility with adhesive, and thus improving the reliability of the final composite product is achieved.

[0021] Preferably, in step S2, when the composite carbon felt is installed in the filter device, the preload is controlled to be 10-50 N.

[0022] By adopting the above technical solution, the pre-tensioning force applied to the composite carbon felt during installation ensures that the carbon felt remains flat in the filter device, preventing it from shaking or wrinkling under airflow impact, thus guaranteeing uniform airflow distribution on the filter surface. At the same time, this pre-tensioning force range ensures that the carbon felt is in a slightly taut elastic state, which not only reserves deformation space for expansion and contraction during dust removal, but also prevents excessive amplitude during dust removal or collision and wear with the device due to excessive looseness. Therefore, the working state of the filter bag in the device is optimized, balancing the static sealing performance and dynamic dust removal deformation requirements.

[0023] Preferably, in step S4, the pressure of the pulsed airflow is controlled to be 0.4 to 0.8 MPa, the frequency is once every 10 to 30 minutes, and the duration of each pulse is 0.1 to 0.5 seconds.

[0024] By adopting the above technical solution, the parameters of pulse cleaning are controlled within the range of pressure, frequency, and pulse width. This pressure range can provide kinetic energy to drive the carbon felt layer to deform and shake off dust, while remaining below the threshold for damaging the carbon fiber or adhesive layer. The frequency matches the accumulation rate of dust on the filter bag surface under industrial conditions. The short pulse ensures that the cleaning action is clean and efficient, avoiding energy consumption and filter bag fatigue caused by continuous airflow. Therefore, the effect of achieving cleaning operation and maintaining stable low-pressure operation of the system is achieved.

[0025] In summary, this application has the following beneficial effects:

[0026] 1. Because this application uses a structure composed of a carbon felt layer and a stainless steel base fabric layer through a special non-woven fabric processing technology, the stainless steel base fabric layer provides a continuous mesh skeleton support for the carbon felt, enhancing the mechanical strength and toughness of the carbon felt. This allows the carbon felt layer to undergo effective elastic deformation when impacted by pulsed airflow. This expansion and contraction makes the dust layer attached to the surface of the carbon felt easy to peel off. Therefore, the folding resistance of the carbon felt is improved to adapt to frequent pulse cleaning operations, while avoiding the effect of dust caking and sticking on the filter surface and being difficult to remove.

[0027] 2. In this application, a base fabric woven from stainless steel wire is preferred. Because this material has high-temperature oxidation resistance and corrosion resistance, and the selected wire diameter and weaving density provide sufficient support strength while maintaining the flexibility of the base fabric, it can deform in synergy with the carbon felt layer. Therefore, the composite carbon felt can be used in high-temperature corrosive flue gas environments for a long time and provide uniform and reliable support.

[0028] 3. In this application, polyacrylonitrile-based carbon fiber felt with a specific density and thickness is preferred, and it is used in combination with stainless steel base cloth with a specified mesh size. Since the carbon felt material itself is resistant to high temperature and has stable chemical properties, the selected density and thickness balance the filtration accuracy, resistance and dust holding capacity. The matching base cloth mesh ensures that the support structure can be fully embedded in the carbon felt body, and the force is transmitted evenly during dust removal. Therefore, under the premise of ensuring high-efficiency filtration performance, the stress distribution of the composite structure is reasonable during the dust removal deformation process, avoiding material damage caused by local stress concentration.

[0029] 4. This application preheats the carbon felt to stabilize the fiber structure and remove volatile substances, laying the foundation for subsequent composite processing. Then, a special nonwoven fabric processing technique is used to ensure a strong and high-temperature resistant interface bond between the carbon felt layer and the stainless steel base fabric layer. Antioxidant additives are then added to the adhesive to delay the aging of the interface material. Furthermore, a replacement solution using nickel-based alloy wire is provided. Nickel-based alloys possess superior ultra-high temperature mechanical properties and corrosion resistance, enabling this composite material to adapt to harsher working environments, thereby expanding the applicable temperature range and environmental adaptability of the carbon felt. Attached Figure Description

[0030] Figure 1 A flowchart illustrating the use of an easy-to-clean, durable carbon felt as proposed in this application. Detailed Implementation

[0031] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0032] Technical concept:

[0033] High-temperature filter materials achieve their filtration function through the inherent microporous structure of materials such as ceramic fibers and porous ceramics. However, when faced with intense dust removal operations such as pulse backflushing, these materials generally suffer from insufficient toughness and high brittleness. As a result, they are prone to fiber breakage or microcrack propagation under frequent mechanical impacts. This not only shortens the service life of the filter media, but also causes the intercepted fine dust to become embedded and clump inside or on the surface of the filter media, forming a dense dust layer that is difficult to peel off. Ultimately, this leads to a sharp increase in filtration resistance and dust removal failure.

[0034] This application discloses an easy-to-clean and durable carbon felt. It includes a carbon felt layer and a stainless steel base fabric layer, wherein the carbon felt layer and the stainless steel base fabric layer are composited using a special non-woven fabric processing technology. The stainless steel base fabric layer is composed of multiple stainless steel wires woven into a mesh structure, evenly distributed within the carbon felt layer. The application also includes the use of the carbon felt, comprising the following steps: S1, composite the carbon felt layer and the stainless steel base fabric layer using a special non-woven fabric processing technology to form a composite carbon felt; S2, cut the composite carbon felt to the required size and install it in a filter device; S3, during filtration, periodically introduce pulsed airflow for cleaning; S4, during cleaning, control the pressure and frequency of the pulsed airflow.

[0035] This application employs a structure composed of a carbon felt layer and a stainless steel base fabric layer through a special non-woven fabric processing technology. The stainless steel base fabric layer provides continuous mesh skeleton support for the carbon felt, enhancing the mechanical strength and toughness of the carbon felt. This allows the carbon felt layer to undergo effective elastic deformation when impacted by pulsed airflow. This expansion and contraction makes the dust layer adhering to the surface of the carbon felt easy to peel off, thus improving the folding resistance of the carbon felt to adapt to frequent pulse cleaning operations, while avoiding the effect of dust caking and sticking on the filter surface, making it difficult to remove.

[0036] Example 1: This example provides an easy-to-clean and durable carbon felt, comprising a carbon felt layer and a stainless steel base fabric layer. The carbon felt layer and the stainless steel base fabric layer are composited using a special non-woven fabric processing technology. The stainless steel base fabric layer is composed of multiple stainless steel wires woven into a mesh structure, evenly distributed within the carbon felt layer. The use of the carbon felt includes the following steps: S1, composite the carbon felt layer and the stainless steel base fabric layer using a special non-woven fabric processing technology. Specifically, the special non-woven fabric processing technology mainly involves needle punching and hydroentangling to form a composite carbon felt; S2, cut the composite carbon felt to the required size and install it in a filter device; S3, during the filtration process, periodically introduce pulsed airflow for cleaning; S4, during cleaning, control the pressure and frequency of the pulsed airflow.

[0037] The stainless steel base fabric layer uses high-temperature resistant and high-strength stainless steel wire with a diameter of 0.1 mm and a weaving density of 10 mesh.

[0038] The carbon felt layer is made of polyacrylonitrile-based carbon fiber felt with a density of 0.2 g / cm³ and a thickness of 5 mm. The stainless steel base fabric layer has a mesh size of 2 mm.

[0039] In step S1, a pretreatment step for the carbon felt layer is also included: the polyacrylonitrile-based carbon fiber felt is heat-treated at 200°C for 30 minutes.

[0040] In step S2, when the composite carbon felt is installed in the filter device, the preload is controlled to be 10N.

[0041] In step S4, the pressure of the pulsed airflow is controlled at 0.4 MPa, the frequency is once every 10 minutes, and the duration of each pulse is 0.1 seconds.

[0042] Example 2: This example provides an easy-to-clean and durable carbon felt, comprising a carbon felt layer and a stainless steel base fabric layer. The carbon felt layer and the stainless steel base fabric layer are composited using a special non-woven fabric processing technology. The stainless steel base fabric layer is composed of multiple stainless steel wires woven into a mesh structure, which is evenly distributed in the carbon felt layer. The use of the carbon felt includes the following steps: S1, composite the carbon felt layer and the stainless steel base fabric layer using a special non-woven fabric processing technology to form a composite carbon felt; S2, cut the composite carbon felt to the required size and install it in the filter device; S3, during the filtration process, periodically introduce pulsed airflow for cleaning; S4, during cleaning, control the pressure and frequency of the pulsed airflow.

[0043] The stainless steel base fabric layer uses high-temperature resistant and high-strength stainless steel wire with a diameter of 0.15mm and a weaving density of 15 mesh.

[0044] The carbon felt layer is made of polyacrylonitrile-based carbon fiber felt with a density of 0.3 g / cm³ and a thickness of 7.5 mm. The stainless steel base fabric layer has a mesh size of 3.5 mm.

[0045] In step S1, a pretreatment step for the carbon felt layer is also included: the polyacrylonitrile-based carbon fiber felt is heat-treated at 250°C for 45 minutes.

[0046] In step S2, when the composite carbon felt is installed in the filter device, the preload is controlled to be 30N.

[0047] In step S4, the pressure of the pulsed airflow is controlled at 0.6 MPa, the frequency is once every 20 minutes, and the duration of each pulse is 0.3 seconds.

[0048] Example 3: This example provides an easy-to-clean and durable carbon felt, comprising a carbon felt layer and a base fabric layer. The carbon felt layer and the base fabric layer are composited using a special non-woven fabric processing technology. The base fabric layer is woven from multiple alloy wires into a mesh structure, which is evenly distributed within the carbon felt layer. The use of the carbon felt includes the following steps: S1, composite the carbon felt layer and the base fabric layer using a special non-woven fabric processing technology to form a composite carbon felt; S2, cut the composite carbon felt to the required size and install it in a filter device; S3, during the filtration process, periodically introduce pulsed airflow for cleaning; S4, during cleaning, control the pressure and frequency of the pulsed airflow.

[0049] The base fabric layer is woven with nickel-based alloy wires, with a wire diameter of 0.2 mm and a weaving density of 20 mesh.

[0050] The carbon felt layer is made of polyacrylonitrile-based carbon fiber felt with a density of 0.4 g / cm³, a thickness of 10 mm, and a mesh size of 5 mm for the base fabric layer.

[0051] In step S1, a pretreatment step for the carbon felt layer is also included: the polyacrylonitrile-based carbon fiber felt is heat-treated at 300°C for 60 minutes.

[0052] In step S2, when the composite carbon felt is installed in the filter device, the preload is controlled to be 50N.

[0053] In step S4, the pressure of the pulsed airflow is controlled at 0.8 MPa, the frequency is once every 30 minutes, and the duration of each pulse is 0.5 seconds.

[0054] Comparative Example 1: This comparative example refers to the content of Example 1, except that the diameter of the stainless steel wire used in the stainless steel base fabric layer is 0.05 mm, and the rest is the same as Example 1.

[0055] Comparative Example 2: This comparative example refers to the content of Example 1, except that the weaving density of the stainless steel base fabric layer is 5 mesh, and the rest is the same as Example 1.

[0056] Comparative Example 3: This comparative example refers to the content of Example 1, except that the density of the polyacrylonitrile-based carbon fiber felt used in the carbon felt layer is 0.1 g / cm³, and the rest is the same as Example 1.

[0057] Comparative Example 4: This comparative example refers to the content of Example 1, except that the heat treatment temperature is 350°C when the carbon felt layer is pretreated in step S1. The rest of the content is the same as that of Example 1.

[0058] Comparative Example 5: This comparative example refers to the content of Example 1, except that the pressure of the pulse airflow is controlled to be 0.2 MPa during the dust removal in step S4. The rest of the content is the same as that of Example 1.

[0059] Performance testing

[0060] Sample preparation: Based on the technical solutions described in Examples 1 to 3 and Comparative Examples 1 to 6 above, corresponding composite carbon felt samples were prepared and cut into standard sizes for subsequent performance testing.

[0061] Pulse cleaning flexural strength and cleaning effect testing: The prepared composite carbon felt samples are installed on a dedicated pulse cleaning test bench, ensuring that the installation preload meets the specified values ​​for each sample. Standard test dust is continuously introduced into one side of the sample to simulate the filtration process. After a stable dust layer forms on the surface, pulse airflow is applied from the clean side of the sample for back-blowing cleaning according to the pulse airflow pressure, frequency, and duration parameters set for each sample. This cleaning cycle is repeated 10,000 times to simulate long-term and frequent cleaning operations. During the test, the deformation recovery of the sample under pulse impact is recorded by high-speed camera, and the peeled dust is collected and weighed after a set period to calculate the cleaning efficiency. The performance parameters of this test are whether the sample exhibits delamination, cracking, or permanent deformation after undergoing a specified number of pulse cycles, and the maintenance of the cleaning efficiency, to evaluate its flexural strength and anti-dust caking ability. The standards used in this test include the industry-standard testing method for the cleaning performance of filter media for bag filters, and relevant material fatigue testing standards are also referenced.

[0062] Table 1: Summary Table of Pulse Cleaning Performance and Cleaning Effect Results

[0063] Group Dust removal efficiency (%) after 10,000 pulses Has delamination / cracking failure occurred? Example 1 95.2 no Example 2 97.8 no Example 3 96.5 no Comparative Example 1 88.4 Yes (the base fabric broke). Comparative Example 2 82.7 Yes (carbon felt breakage). Comparative Example 3 92.1 no Comparative Example 4 85.6 Yes (carbon felt aging and cracking) Comparative Example 5 78.9 no

[0064] Mechanical property retention rate test under high temperature and corrosion environment: The sample is placed in a high temperature corrosion test chamber, and simulated corrosive flue gas containing sulfur dioxide, nitrogen oxides and water vapor is introduced under a set high temperature environment; the sample is continuously exposed to this environment for a specified time, such as 500h or 1000h; after the exposure test, the sample is removed and cooled to room temperature; then, using a universal testing machine, the exposed sample is cut according to the standard specimen size, and the tensile strength and elongation at break are tested; by comparing the mechanical property data of the sample before and after exposure, its strength retention rate and toughness change are calculated; the performance parameter of this test is the percentage of mechanical properties retained after high temperature corrosion aging, which is used to verify the high temperature oxidation resistance and corrosion resistance of the base fabric material and its continuous and reliable support capacity for carbon felt; this test mainly refers to the test method for corrosion resistance of high temperature filter materials and the national standard for tensile testing of metallic materials.

[0065] Table 2: Summary of Mechanical Property Retention Rate under High Temperature and Corrosion Resistance Environment

[0066] Group Tensile strength retention rate (%) after 500 hours of high-temperature corrosion exposure Example 1 91.5 Example 2 94.2 Example 3 96.8 Comparative Example 1 72.3 Comparative Example 2 85.1 Comparative Example 3 88.6 Comparative Example 4 68.4 Comparative Example 5 90.7

[0067] Filtration accuracy, resistance characteristics, and dust removal resistance testing: Using an automated filter media performance testing bench, dust is generated upstream of a clean sample at a specified filtration velocity. The particle concentration and airflow pressure difference upstream and downstream of the sample are continuously monitored and recorded. The test continues until the sample resistance reaches the specified final resistance value, thereby calculating the initial staged filtration efficiency, dynamic dust adsorption capacity, and final resistance. After the initial filtration performance test, the sample undergoes a standardized laboratory pulse cleaning operation. After cleaning, the above filtration performance test procedure is repeated to obtain the filtration efficiency and initial resistance value after cleaning. By comparing the changes in filtration efficiency and resistance recovery before and after cleaning, the degree of damage to the sample's microstructure during the cleaning process is evaluated. The performance parameters of this test include initial filtration efficiency, dynamic dust adsorption capacity, cleaning resistance, efficiency retention rate after cleaning, and resistance recovery rate, which are used to verify the influence of carbon felt density, thickness, and base fabric mesh matching on filtration performance and stress distribution rationality. This test follows the relevant national standards for bag filter media performance testing.

[0068] Table 3: Summary Table of Filtration Accuracy, Resistance Characteristics and Dust Removal Damage Resistance Results

[0069] Group Initial filtration efficiency (for 0.5μm particles, %) Cleaning resistance (Pa) Filtration efficiency retention rate after pulse cleaning (%) Example 1 99.65 120 99.60 Example 2 99.82 185 99.78 Example 3 99.91 250 99.88 Comparative Example 1 99.58 105 99.20 Comparative Example 2 99.20 95 98.85 Comparative Example 3 99.10 85 98.95 Comparative Example 4 99.70 135 99.15 Comparative Example 5 99.60 118 99.55

[0070] Extended testing for adaptability to ultra-high temperature environments: Samples are placed in a high-temperature muffle furnace and subjected to a high-temperature oxidation test in an air atmosphere. The temperature setting can be higher than that of conventional tests, and the temperature is maintained at a constant level for a certain period of time. During the test, samples are periodically removed, cooled, and weighed, and the change in mass per unit area, i.e., oxidation weight gain, is recorded. After the test, macroscopic and microscopic observations are performed on the samples to check for the presence of oxidative embrittlement of the base fabric, powdering of the coating, or delamination. The aforementioned mechanical property tests can also be used as supplementary tests. The performance parameters of this test are the oxidation weight gain rate at a specific temperature and time and the macroscopic integrity after high-temperature exposure, which are used to evaluate the upper limit of the temperature range and environmental adaptability of the material. This test refers to the high-temperature alloy oxidation resistance test standard and the high-temperature material heat exposure test method.

[0071] Table 4: Summary of Ultra-High Temperature Environment Adaptability Results

[0072] Group <![CDATA[Oxidation weight gain (g / m 2 ) after exposure to air atmosphere at 600 °C for 100 h Is the macroscopic integrity intact after exposure to 600℃ for 100 hours? Example 1 3.2 yes Example 2 2.8 yes Example 3 2.5 yes Comparative Example 1 5.1 No (the base fabric is severely hydrogenated) Comparative Example 2 3.8 yes Comparative Example 3 4.5 yes Comparative Example 4 6.7 No (carbon felt pulverized) Comparative Example 5 3.3 yes

[0073] Example Conclusion:

[0074] As can be seen from Examples 1-3 and Comparative Example 1, and from Tables 1 and 2, using metal wire of appropriate diameter as the base fabric layer can effectively enhance the structural support and fatigue resistance of the composite carbon felt, prevent matrix fracture during frequent pulse cleaning, and ensure its long-term mechanical performance stability in high-temperature corrosive environments.

[0075] As can be seen from Examples 1-3 and Comparative Example 2, and Table 1, using a base fabric layer with an appropriate weaving density can provide uniform mechanical support for the carbon felt layer, preventing the carbon felt from breaking at the stress concentration point during dust removal, thereby maintaining the integrity of the overall structure and the stability of the dust removal effect.

[0076] As can be seen from Examples 1-3 and Comparative Example 3, and Table 3, using an appropriate carbon felt layer density can ensure high filtration accuracy while keeping the cleaning resistance within a reasonable range, and better maintain filtration efficiency after dust removal, thus achieving a balance between filtration performance and operating resistance.

[0077] As can be seen from Examples 1-3 and Comparative Example 4, and from Tables 1 and 4, moderate preheating of the carbon felt layer helps stabilize its fiber structure and avoids embrittlement, pulverization or cracking of the carbon felt due to excessive heat treatment, thereby ensuring its overall integrity under pulse cleaning and ultra-high temperature environments.

[0078] As can be seen from Examples 1-3 and Comparative Example 5, and Table 1, using sufficient pulse cleaning pressure is a factor in ensuring effective removal of the dust layer and maintaining high-efficiency dust removal. Insufficient pressure will lead to incomplete cleaning and affect the continuous and stable operation of the filtration system.

[0079] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A carbon felt that is easy to clean and durable, characterized in that, It includes a carbon felt layer and a stainless steel base fabric layer, wherein the carbon felt layer and the stainless steel base fabric layer are composited by a special non-woven fabric processing technology, and the stainless steel base fabric layer is woven into a mesh structure by multiple stainless steel wires and evenly distributed in the carbon felt layer. It also includes the use of carbon felt, including the following steps: S1. The carbon felt layer and the stainless steel base fabric layer are combined using a special non-woven fabric processing technology to form a composite carbon felt. S2. Cut the composite carbon felt to the required size and install it in the filter device; S3. During the filtration process, pulsed airflow is periodically introduced for dust removal; S4. During dust removal, control the pressure and frequency of the pulse airflow.

2. The easy-to-clean, fold-resistant carbon felt according to claim 1, characterized in that, The stainless steel base fabric layer is made of high-temperature resistant and high-strength stainless steel wire with a diameter of 0.1-0.2 mm and a weaving density of 10-20 mesh.

3. The easy-to-clean, fold-resistant carbon felt according to claim 1, characterized in that, The carbon felt layer is made of polyacrylonitrile-based carbon fiber felt with a density of 0.2 to 0.4 g / cm³, the thickness of the carbon felt layer is 5 to 10 mm, and the mesh size of the stainless steel base fabric layer is 2 to 5 mm.

4. The easy-to-clean, fold-resistant carbon felt according to claim 1, characterized in that, The stainless steel base fabric layer can be replaced with a base fabric woven from nickel-based alloy wires, wherein the diameter of the nickel-based alloy wires is 0.1-0.2 mm and the weaving density is 10-20 mesh.

5. The easy-to-clean, fold-resistant carbon felt according to claim 1, characterized in that, Step S1 also includes a pretreatment step for the carbon felt layer: heat-treating the polyacrylonitrile-based carbon fiber felt at a temperature of 200-300°C for 30-60 minutes.

6. The easy-to-clean, fold-resistant carbon felt according to claim 1, characterized in that, In step S2, when the composite carbon felt is installed in the filter device, the preload is controlled to be 10-50 N.

7. The easy-to-clean, fold-resistant carbon felt according to claim 1, characterized in that, In step S4, the pressure of the pulsed airflow is controlled to be 0.4–0.8 MPa, the frequency is once every 10–30 minutes, and the duration of each pulse is 0.1–0.5 seconds.

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