Biochar composite smoke dust filter material device suitable for high-temperature resistance furnace

Abstract

The utility model provides a charcoal composite smoke dust filter material device suitable for a high temperature resistance furnace, which comprises a filter material main body, a high temperature stable layer, an anti-oxidation layer, a porous support layer and a filter screen layer, the filter material main body is cylindrical and has a hollow structure, the high temperature stable layer is arranged on the outer surface of the filter material main body, and the anti-oxidation layer is arranged on the outer surface of the filter material main body. The anti-oxidation layer is arranged on the outer surface of the high-temperature stable layer, the porous supporting layer is arranged on the outer surface of the anti-oxidation layer, and the filter screen layer is arranged on the outer surface of the porous supporting layer. Through material compounding (ceramic + biochar + nanoparticle) structure layering (high temperature resistance / oxidation resistance / supporting / filtering) and micropore gradient design, the four core problems of insufficient high temperature resistance, easy biochar oxidation, low filtering efficiency, easy blockage, easy structure damage and frequent maintenance of the traditional filter material in the application of the high-temperature resistance furnace are systematically solved. The material filtering device has remarkable technical advantages on smoke dust filtering in high-temperature industrial scenes (such as metal smelting and waste incineration).

Description

Technical Field

[0001] This invention relates to the field of environmental protection materials technology, and in particular to a biochar composite dust filter device suitable for high-temperature resistance furnaces. Background Technology

[0002] With the continuous development of high-temperature resistance furnaces and their supporting flue gas treatment technologies, existing high-temperature filter media, resistance furnace flue gas, and biochar composite materials have been applied to some extent. However, these products still have some problems in practical use. For example, the high-temperature filter media currently on the market usually use traditional metal or ceramic materials, which have limited high-temperature resistance and are prone to embrittlement or degradation of physical properties under high-temperature environments, resulting in short service life and high maintenance costs. In addition, traditional filter media have poor filtration effects when treating flue gas, making it difficult to effectively remove fine particulate matter, affecting the environment and equipment safety. To improve performance, some manufacturers have tried to improve the performance of filter media by using biochar composite materials. However, such improvements often face the problem that biochar composite materials are prone to oxidation and have poor stability under high-temperature conditions. This leads to a decrease in the efficiency of the filter media in long-term use and makes it difficult to meet the stringent environmental requirements of high-temperature resistance furnaces. A multi-group conductive porous ceramic filter tube with publication number CN105327578A and publication date February 17, 2016. This design employs conductive porous ceramic material, which carries a high-voltage charge with the same electrical charge as the dust particles. An insulating gasket ensures gas sealing and electrical insulation between the conductive porous ceramic tube and the perforated plate. Charged dust particles in the gas cannot enter the micropores of the conductive porous ceramic filter tube wall, facilitating dust removal. Furthermore, the significant repulsion between dust particles makes the dust cake layer formed on the surface of the conductive porous ceramic filter tube more porous, resulting in very low gas resistance and easy regeneration through compressed gas backflushing. Therefore, this design is insufficient to meet the requirements of high-temperature resistance furnaces for long-term stability and high-efficiency filtration. Summary of the Invention

[0003] To address the problem that current high-temperature filter media, electric resistance furnace flue gas, and biochar composite materials on the market are unable to effectively meet the demands of the harsh environment of high-temperature electric resistance furnaces, this utility model provides a biochar composite flue gas filter media suitable for high-temperature electric resistance furnaces to overcome these shortcomings and offer a new solution that is more intelligent, efficient, and adaptable to changing environments.

[0004] This invention provides a biochar composite flue gas filter material suitable for high-temperature resistance furnaces. Through the layered structure (high temperature resistance / oxidation resistance / support / filtration) of the composite material (ceramic + biochar + nanoparticles) and the microporous gradient design, it systematically solves the four core problems existing in the application of traditional filter materials in high-temperature resistance furnaces:

[0005] 1. Insufficient high temperature resistance: Ceramic fiber + nano titanium dioxide enhance high temperature stability;

[0006] 2. Biochar is easily oxidized: Nano-alumina / silicon + zinc oxide form an antioxidant barrier;

[0007] 3. Low filtration efficiency and easy clogging: graded filtration is achieved by gradient micropores + composite adsorption layer;

[0008] 4. The structure is prone to damage and requires frequent maintenance: multi-layer bonding + porous support layer improves mechanical strength.

[0009] These improvements give the filter media device significant technical advantages and economic benefits in high-temperature industrial scenarios (such as metal smelting and waste incineration).

[0010] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0011] A biochar composite dust filter media device suitable for high-temperature resistance furnaces includes a filter media body, a high-temperature stabilizing layer, an antioxidant layer, a porous support layer, and a filter screen layer;

[0012] The filter media body is cylindrical in shape and has a hollow internal structure;

[0013] The high-temperature stabilizing layer is disposed on the outer surface of the filter media body, the antioxidant layer is disposed on the outer surface of the high-temperature stabilizing layer, the porous support layer is disposed on the outer surface of the antioxidant layer, and the filter mesh layer is disposed on the outer surface of the porous support layer.

[0014] The high-temperature stabilizing layer is a multi-layer structure composed of multiple ceramic fiber materials. Each layer of ceramic fiber material is bonded and fixed with a high-temperature adhesive. The thickness of the high-temperature stabilizing layer is 2mm to 5mm, and a number of micropores I are evenly distributed on its outer surface. The diameter of the micropores I is 0.1mm to 0.5mm, and the depth is 0.5mm to 1.5mm.

[0015] The antioxidant layer is composed of a mixture of nano-alumina particles and nano-silica particles with a particle size of 50nm to 100nm. The thickness of the antioxidant layer is 0.5mm to 1.5mm, and a number of micropores II are uniformly distributed on its outer surface. The diameter of the micropores II is 0.05mm to 0.2mm, and the depth is 0.2mm to 0.8mm.

[0016] The porous support layer is composed of porous ceramic material with a pore size of 0.1 mm to 0.5 mm and a thickness of 3 mm to 8 mm. A number of micropores III are uniformly distributed on its outer surface. The diameter of the micropores III is 0.1 mm to 0.5 mm and the depth is 0.5 mm to 1.5 mm.

[0017] The filter layer consists of a metal fiber mesh and an outer biochar fiber mesh. The pore size of the metal fiber mesh is 0.05 mm to 0.1 mm, and the pore size of the biochar fiber mesh is 0.01 mm to 0.05 mm. The thickness of the filter layer is 1 mm to 3 mm, and its outer surface is uniformly distributed with a plurality of micropores IV. The diameter of the micropores IV is 0.01 mm to 0.1 mm, and the depth is 0.1 mm to 0.5 mm.

[0018] Preferably, the micropores I of the high-temperature stable layer are filled with nano-titanium dioxide particles, the particle size of which is 50nm to 100nm, and the filling amount is 30% to 50% of the volume of micropore I.

[0019] Preferably, the micropores II of the antioxidant layer are filled with nano zinc oxide particles, the particle size of which is 50 nm to 100 nm, and the filling amount is 20% to 40% of the volume of the micropores II.

[0020] Preferably, the micropores III of the porous support layer are filled with nano-alumina particles, the particle size of which is 50 nm to 100 nm, and the filling amount is 10% to 30% of the volume of the micropores III.

[0021] Preferably, the micropores IV of the filter layer are filled with nano-activated carbon particles, the particle size of which is 50 nm to 100 nm, and the filling amount is 10% to 30% of the volume of the micropores IV.

[0022] Preferably, the inner surface of the filter media body is provided with a plurality of protruding structures, the protruding structures being conical in shape, with a height of 1mm to 3mm, a diameter of 2mm to 5mm, and a spacing of 5mm to 10mm.

[0023] Preferably, the outer surface of the filter media body is provided with a plurality of groove structures, the groove structures being rectangular in shape, with a depth of 1mm to 3mm, a width of 2mm to 5mm, and a spacing of 5mm to 10mm.

[0024] Preferably, the high-temperature stabilizing layer, the antioxidant layer, the porous support layer, and the filter layer are bonded and fixed together by a high-temperature adhesive, wherein the high-temperature adhesive is a high-temperature resistant silicone with a thickness of 0.1 mm to 0.3 mm.

[0025] More preferably, the thickness of the high-temperature stabilizing layer is 3 mm, the thickness of the anti-oxidation layer is 1 mm, the thickness of the porous support layer is 5 mm, and the thickness of the filter layer is 2 mm.

[0026] More preferably, the micropores I of the high-temperature stabilizing layer have a diameter of 0.3 mm and a depth of 1 mm; the micropores II of the antioxidant layer have a diameter of 0.1 mm and a depth of 0.5 mm; the micropores III of the porous support layer have a diameter of 0.3 mm and a depth of 1 mm; and the micropores IV of the filter layer have a diameter of 0.05 mm and a depth of 0.3 mm.

[0027] The technical effect achieved by this utility model is:

[0028] 1. Significantly Improved High-Temperature Resistance. The high-temperature stabilizing layer design of this application employs multi-layered ceramic fibers bonded together with a high-temperature adhesive and filled with nano-titanium dioxide particles. Due to the low coefficient of thermal expansion and high melting point (>1600℃) of ceramic fibers, the multi-layered structure disperses thermal stress, preventing single-layer brittleness. The nano-titanium dioxide particles (50-100nm in diameter) fill the micropores; their high specific surface area and thermal stability enhance the high-temperature resistance of the ceramic fibers, while the physical support between the particles reduces micropore collapse. Compared to metal filter media, the ceramic fiber + nanoparticle composite structure of this application exhibits approximately 30% higher flexural strength at 1200℃ and more than doubles its service life.

[0029] 2. Optimized Antioxidant Performance. The antioxidant layer design of this application consists of a matrix composed of a mixture of nano-alumina and silica, with micropores filled with nano-zinc oxide particles. The nano-alumina / silicon mixture forms a dense protective layer, preventing direct contact between oxygen and the biochar fibers. Nano-zinc oxide has a catalytic oxidation-inhibiting effect, preferentially reacting with free oxygen to generate stable oxides (such as ZnO2), thus delaying biochar oxidation.

[0030] 3. Enhanced filtration efficiency and anti-clogging capability. In the gradient microporous structure of this application, the micropore size of each layer decreases progressively (filter mesh layer 18: 0.01-0.1mm → porous support layer 15: 0.1-0.5mm). In the composite filter layer, the metal fiber mesh intercepts large particles (>0.05mm), the biochar fiber mesh adsorbs small particles (<0.05mm), and the nano-activated carbon further captures ultrafine particles below PM0.1. Gradient filtration reduces the load on a single layer, and the outer layer intercepts large particles, reducing the risk of clogging in the inner layer. The composite adsorption mechanism of biochar fiber + nano-activated carbon, through the synergistic effect of physical interception and chemical adsorption, improves the capture efficiency of fine particles. Under the same dust concentration, the initial pressure drop of the filter media of this application is 20% lower than that of traditional metal filter media, and after 100 hours of continuous operation, the pressure drop growth rate is only 50% of the latter, with a filtration efficiency of 99.5%, higher than the 95% of traditional filter media.

[0031] 4. Reduced Structural Stability and Maintenance Costs. This application employs multi-layer bonding for fixation. The high-temperature stabilizing layer and anti-oxidation layer are bonded using high-temperature resistant silicone rubber, with a bonding thickness of 0.1-0.3 mm. A porous support layer is used for reinforcement; porous ceramic filled with nano-alumina particles enhances compressive strength (>50 MPa). The silicone rubber maintains viscoelasticity at high temperatures (<300℃), mitigating interlayer thermal stress differences and preventing delamination. The composite support structure of porous ceramic and nano-alumina increases compressive strength by 40% compared to pure ceramic, reducing damage caused by mechanical impact. In vibration tests, the interlayer peel force of this application's filter media is three times that of traditional designs, extending the maintenance cycle from 3 months to 6-12 months, and reducing overall maintenance costs by 60%.

[0032] 5. Increasing the contact area between smoke and dust to avoid laminar flow effects. This application employs a raised and recessed structure, with conical protrusions on the inner surface of the filter media body and rectangular recesses on the outer surface. The raised structure disrupts laminar flow, guiding the airflow to form turbulence and increasing the probability of contact between smoke and dust and the filter media. The recessed structure expands the effective filtration area by approximately 30%, while simultaneously guiding the smoke and dust along the recessed path, reducing localized clogging. At the same flow rate, the smoke and dust collection efficiency of the filter media in this application is increased by 15% compared to the planar structure filter media, while the pressure drop is reduced by 10%. Attached Figure Description

[0033] Figure 1 A schematic diagram of the structure of biochar composite dust filter media;

[0034] Figure 2 This is a schematic diagram of the high-temperature stabilization layer structure;

[0035] Figure 3 This is a schematic diagram of the antioxidant layer structure;

[0036] Figure 4 This is a magnified schematic diagram of the nano-alumina particles and nano-silicon oxide particles in the antioxidant layer structure.

[0037] Figure 5 This is a schematic diagram of a porous support layer structure;

[0038] Figure 6 This is a schematic diagram of the filter layer structure;

[0039] Figure 7 This is a schematic diagram of the main structure of the filter media;

[0040] In the diagram: 1. Filter media body; 2. High-temperature stabilizing layer; 3. Antioxidant layer; 4. Porous support layer; 5. Filter mesh layer; 6. Ceramic fiber material; 7. High-temperature binder; 8. Micropore I (diameter 0.1mm-0.5mm); 9. Titanium dioxide particles; 10. Nano alumina particles; 11. Nano silica particles; 12. Micropore II (diameter 0.05mm-0.2mm); 13. Nano zinc oxide particles; 15. Micropore III (diameter 0.1mm-0.5mm); 16. Metal fiber mesh; 17. Biochar fiber mesh; 18. Micropore IV (diameter 0.01mm-0.1mm); 19. Activated carbon particles; 20. Protruding structure; 21. Groove structure; Detailed Implementation

[0041] The technical solution of this utility model will be further described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] See Figure 1 This utility model provides a biochar composite flue gas filter material suitable for high-temperature resistance furnaces, comprising a filter material body 1, a high-temperature stabilizing layer 2, an antioxidant layer 3, a porous support layer 4, and a filter screen layer 5. The filter material body 1 is cylindrical in shape and has a hollow internal structure. The high-temperature stabilizing layer 2 is disposed on the outer surface of the filter material body 1, the antioxidant layer 3 is disposed on the outer surface of the high-temperature stabilizing layer 2, the porous support layer 4 is disposed on the outer surface of the antioxidant layer 3, and the filter screen layer 5 is disposed on the outer surface of the porous support layer 4.

[0043] See Figure 2 The high-temperature stabilizing layer 2 is a multilayer structure composed of multiple layers of ceramic fiber material 6, with each layer of ceramic fiber material 6 bonded and fixed together by a high-temperature adhesive 7. The thickness of the high-temperature stabilizing layer 2 is 2 mm to 5 mm, and its outer surface is uniformly distributed with several micropores I8. The diameter of the micropores I8 is 0.1 mm to 0.5 mm, and the depth is 0.5 mm to 1.5 mm. The micropores I8 are filled with nano-titanium dioxide particles 9, with a particle size of 50 nm to 100 nm, and the filling amount is 30% to 50% of the volume of the micropores I8.

[0044] The high-temperature stabilizing layer 2 of this invention is composed of multiple layers of ceramic fiber material 6, which are bonded and fixed together by a high-temperature adhesive 7 to form a high-temperature resistant protective layer. The micropores I 8 on the outer surface of the high-temperature stabilizing layer 2 are filled with nano-titanium dioxide particles 9, which improves the high-temperature resistance of the high-temperature stabilizing layer 2 and ensures the stability and service life of the filter media in high-temperature environments.

[0045] See Figure 3and Figure 4 The antioxidant layer 3 is a mixed layer composed of nano-alumina particles 10 and nano-silica particles 11, both with a particle size of 50 nm to 100 nm. The thickness of the antioxidant layer 3 is 0.5 mm to 1.5 mm, and its outer surface is uniformly distributed with several micropores II 12, each with a diameter of 0.05 mm to 0.2 mm and a depth of 0.2 mm to 0.8 mm. The micropores II 12 are filled with nano-zinc oxide particles 13, with a particle size of 50 nm to 100 nm, and the filling amount is 20% to 40% of the volume of the micropores II 12. By filling the micropores II 12 with nano-zinc oxide particles 13, the antioxidant performance of the antioxidant layer 3 is improved, ensuring the stability and service life of the filter media under high-temperature environments.

[0046] See Figure 5 The porous support layer 4 is composed of porous ceramic material with a pore size of 0.1 mm to 0.5 mm. The thickness of the porous support layer 4 is 3 mm to 8 mm, and its outer surface is uniformly distributed with several micropores III15, each with a diameter of 0.1 mm to 0.5 mm and a depth of 0.5 mm to 1.5 mm. The micropores III15 are filled with nano-alumina particles 10, with a particle size of 50 nm to 100 nm, and the filling amount is 10% to 30% of the volume of the micropores III15. By filling the micropores III15 with nano-alumina particles 10, the mechanical strength and high-temperature resistance of the porous support layer 4 are improved, ensuring the stability and service life of the filter media under high-temperature environments.

[0047] See Figure 6 The filter layer 5 is composed of a composite material of a metal fiber mesh 16 and an outer biochar fiber mesh 17. The pore size of the metal fiber mesh 16 is 0.05 mm to 0.1 mm, and the pore size of the biochar fiber mesh 17 is 0.01 mm to 0.05 mm. The thickness of the filter layer 5 is 1 mm to 3 mm, and its outer surface is uniformly distributed with a number of micropores IV 18. The diameter of the micropores IV 18 is 0.01 mm to 0.1 mm, and the depth is 0.1 mm to 0.5 mm. The micropores IV 18 are filled with nano-activated carbon particles 19, which improves the filtration effect and adsorption performance of the filter layer 5. The particle size of the nano-activated carbon particles 19 is 50 nm to 100 nm, and the filling amount is 10% to 30% of the volume of the micropores IV 18.

[0048] See Figure 7The inner surface of the filter media body 1 is provided with several protruding structures 20. The protruding structures 20 are conical in shape, with a height of 1mm to 3mm, a diameter of 2mm to 5mm, and a spacing of 5mm to 10mm. The outer surface of the filter media body 1 is provided with several groove structures 21. The groove structures 21 are rectangular in shape, with a depth of 1mm to 3mm, a width of 2mm to 5mm, and a spacing of 5mm to 10mm. By providing several protruding structures 20 on the inner surface of the filter media body 1 and several groove structures 21 on the outer surface of the filter media body 1, the surface area of ​​the filter media body 1 is increased, thereby improving the filtration effect.

[0049] The high-temperature stabilizing layer 2, the antioxidant layer 3, the porous support layer 4, and the filter layer 5 of this utility model are bonded and fixed together by a high-temperature adhesive 7, which is a high-temperature resistant organic silicone with a thickness of 0.1mm to 0.3mm.

[0050] In some embodiments of this utility model, the thickness of the high-temperature stabilizing layer 2 is selected to be 3 mm, the thickness of the antioxidant layer 3 is 1 mm, the thickness of the porous support layer 4 is 5 mm, and the thickness of the filter layer 5 is 2 mm.

[0051] In some embodiments of this utility model, the micropores I8 of the high-temperature stabilizing layer 2 have a diameter of 0.3 mm and a depth of 1 mm; the micropores II12 of the antioxidant layer 3 have a diameter of 0.1 mm and a depth of 0.5 mm; the micropores III15 of the porous support layer 4 have a diameter of 0.3 mm and a depth of 1 mm; and the micropores IV18 of the filter layer 5 have a diameter of 0.05 mm and a depth of 0.3 mm.

[0052] Based on the above embodiments, this utility model has the following key technical points:

[0053] 1. Multi-layer composite structure design: Through the synergistic effect of different functional layers, high temperature resistance, oxidation resistance and high-efficiency filtration are achieved.

[0054] 2. Nanoparticle filling technology: By precisely controlling the filling of nanoparticles, the performance of each functional layer is optimized.

[0055] 3. Special structural design: The surface area is increased and the filtration effect is improved by the inner surface protrusion and the outer surface groove structure.

[0056] 4. Application of high-temperature adhesives: to ensure the stability of multilayer structures in high-temperature environments.

[0057] By employing the above technical methods, the shortcomings of traditional high-temperature filter media in terms of performance are overcome, providing a highly efficient, stable, and long-lasting solution for flue gas filtration in high-temperature resistance furnaces. This biochar composite flue gas filter media device can effectively cope with the high temperature and flue gas environment in high-temperature resistance furnaces, exhibiting excellent high-temperature resistance, oxidation resistance, and filtration effect, making it suitable for flue gas filtration in high-temperature resistance furnaces.

[0058] The method of using this utility model is as follows:

[0059] 1. Equipment compatibility check

[0060] Confirm that the dimensions of the filter media device (cylindrical hollow structure) match the flue gas emission port of the high-temperature resistance furnace, ensuring that the filter media body 1 can be securely embedded in the furnace interface. Check that each functional layer (high-temperature stabilizing layer 2, anti-oxidation layer 3, etc.) is intact and undamaged to avoid leakage or failure due to structural defects after installation.

[0061] 2. Filter media installation

[0062] Insert the hollow cylindrical end of the filter media body 1 into the outlet of the electric resistance furnace flue, ensuring that the groove structure 21 on its outer surface fits tightly against the inner wall of the flue. The groove increases the contact area to enhance the sealing performance. Use high-temperature adhesive or a special clip fixing device to ensure that the layers of the filter media (high-temperature stable layer 2, anti-oxidation layer 3, etc.) are firmly bonded to prevent delamination at high temperatures.

[0063] 3. Connecting the auxiliary system

[0064] If a backflushing cleaning system is required (for removing accumulated dust), connect the backflushing pipe to the raised structure 20 of the filter media body 1, and use the conical protrusion to guide the airflow distribution to improve cleaning efficiency.

[0065] Before starting the operation, it is necessary to perform pre-start checks and set the running parameters, including:

[0066] 1. Pre-start checks

[0067] Confirm that the micropores I8 of the high-temperature stable layer 2 are not blocked and that the nano-titanium dioxide particles 9 are uniformly filled. Check whether the nano-zinc oxide particles 13 of the antioxidant layer 3 are intact to avoid failure of oxidation protection.

[0068] 2. Running parameter settings

[0069] Adjust the flue gas flow rate according to the operating temperature of the resistance furnace (e.g., 800℃~1200℃) to ensure that each layer of the filter media (e.g., porous support layer 4) can withstand the high-temperature impact. Monitor the pressure difference change of the filter layer 5 (via the front and rear pressure sensors). If the pressure difference increases significantly (>10% of the design value), it indicates that the filter media needs to be cleaned or replaced.

[0070] 3. Filtration process

[0071] The smoke and dust pass through the filter mesh layer 5, the porous support layer 4, the anti-oxidation layer 3, and the high-temperature stabilization layer 2 in sequence, and finally enter the hollow area of ​​the filter material body 1 before being discharged.

[0072] Fine particles (PM<0.1mm) are adsorbed by biochar fiber mesh 17 and nano activated carbon particles 19, while larger particles are intercepted by metal fiber mesh 16.

[0073] Maintenance and cleaning should include regular inspections and high-temperature cleaning, including:

[0074] 1. Regular inspections

[0075] Every 200-300 hours of operation, check for blockages in the micropores of each layer (especially micropores IV18 in filter layer 5). Surface dust can be removed using low-pressure backflushing gas. Monitor the filling amount of nanoparticles (such as zinc oxide and activated carbon). If more than 30% of the particles are lost, the corresponding layer needs to be replenished or replaced.

[0076] 2. High-temperature cleaning

[0077] For stubborn carbon deposits or sintered materials, a resistance furnace can be started to raise the temperature to over 600°C to decompose the pollutants through high-temperature pyrolysis, followed by backflushing to remove them.

[0078] 3. Replacement cycle

[0079] Under continuous high temperature (>1000℃) conditions, it is recommended to replace the filter media every 6 to 12 months to prevent the ceramic fiber material 6 and the porous ceramic material 14 from becoming embrittled due to long-term thermal stress.

[0080] Safety precautions must be taken during installation or maintenance, including:

[0081] 1. Safety Protection

[0082] During installation or maintenance, allow the equipment to cool to room temperature to avoid burns from high temperatures. When handling nanoparticles (such as titanium dioxide and zinc oxide), wear a protective mask to prevent inhalation.

[0083] 2. Environmental Adaptation

[0084] If the flue gas contains corrosive gases (such as SO2), it is necessary to additionally check whether the nano-alumina / silicon particles of the anti-oxidation layer 3 are corroded, and shorten the maintenance cycle if necessary. Adjust the thickness of the filter layer according to the actual flue gas concentration (for example, a porous support layer of 4 to 8 mm can be added for high-concentration flue gas) to balance filtration efficiency and pressure drop.

[0085] Through the above methods, the filter media device can achieve comprehensive performance of high-efficiency filtration, high temperature resistance, and long service life, meeting the dust treatment requirements of high-temperature resistance furnaces.

Claims

1. A biochar composite soot filter device suitable for high-temperature resistance furnaces, comprising a filter body (1), a high-temperature stable layer (2), an oxidation-resistant layer (3), a porous support layer (4), and a filter mesh layer (5), characterized in that: the filter body (1) is in a cylindrical shape and has a hollow structure inside; the high-temperature stable layer (2) is arranged on the outer surface of the filter body (1), the oxidation-resistant layer (3) is arranged on the outer surface of the high-temperature stable layer (2), the porous support layer (4) is arranged on the outer surface of the oxidation-resistant layer (3), and the filter mesh layer (5) is arranged on the outer surface of the porous support layer (4); the high-temperature stable layer (2) is a multi-layer structure composed of multiple layers of ceramic fiber material (6), each layer of ceramic fiber material (6) is fixed by high-temperature adhesive (7), the thickness of the high-temperature stable layer (2) is 2-5 mm, and the outer surface is uniformly distributed with a plurality of micro-holes I (8), the diameter of the micro-holes I (8) is 0.1-0.5 mm, and the depth is 0.5-1.5 mm; the oxidation-resistant layer (3) is composed of a mixture of nano-alumina particles and nano-silicon oxide particles with a particle size of 50-100 nm, the thickness of the oxidation-resistant layer (3) is 0.5-1.5 mm, and the outer surface is uniformly distributed with a plurality of micro-holes II (12), the diameter of the micro-holes II (12) is 0.05-0.2 mm, and the depth is 0.2-0.8 mm; the porous support layer (4) is composed of porous ceramic material (14) with a pore size of 0.1-0.5 mm, the thickness of the porous support layer (4) is 3-8 mm, and the outer surface is uniformly distributed with a plurality of micro-holes III (15), the diameter of the micro-holes III (15) is 0.1-0.5 mm, and the depth is 0.5-1.5 mm; the filter mesh layer (5) is composed of a metal fiber mesh (16) and a biochar fiber mesh (17) outside it, the pore size of the metal fiber mesh (16) is 0.05-0.1 mm, the pore size of the biochar fiber mesh (17) is 0.01-0.05 mm, the thickness of the filter mesh layer (5) is 1-3 mm, and the outer surface is uniformly distributed with a plurality of micro-holes IV (18), the diameter of the micro-holes IV (18) is 0.01-0.1 mm, and the depth is 0.1-0.5 mm. The micro-holes I (8) of the high-temperature stable layer (2) are filled with nano-titanium dioxide particles (9) with a particle size of 50-100 nm, and the filling amount is 30-50% of the volume of the micro-holes I (8). The micro-holes II (12) of the oxidation-resistant layer (3) are filled with nano-zinc oxide particles (13) with a particle size of 50-100 nm, and the filling amount is 20-40% of the volume of the micro-holes II (12). ​ ​ ​ ​ ​ ​ 2. The biochar composite soot filter device of claim 1, wherein: ​ 3. The biochar composite soot filter device of claim 1, wherein: ​ 4. The biochar composite soot filter device of claim 1, wherein: The micropore III (15) of the porous support layer (4) is filled with nano-aluminum oxide particles (10), the particle size of the nano-aluminum oxide particles (10) is 50-100 nm, and the filling amount is 10-30% of the volume of the micropore III (15).

5. The biochar composite soot filter device of claim 1, wherein: The micropore IV (18) of the filter screen layer (5) is filled with nano-activated carbon particles (19), the particle size of the nano-activated carbon particles (19) is 50-100 nm, and the filling amount is 10-30% of the volume of the micropore IV (18).

6. The biochar composite soot filter device of claim 1, wherein: The inner surface of the filter material body (1) is provided with a plurality of convex structures (20), the shape of the convex structure (20) is conical, the height is 1-3 mm, the diameter is 2-5 mm, and the interval is 5-10 mm.

7. The biochar composite soot filter device of claim 1, wherein: The outer surface of the filter material body (1) is provided with a plurality of groove structures (21), the shape of the groove structure (21) is rectangular, the depth is 1-3 mm, the width is 2-5 mm, and the interval is 5-10 mm.

8. The biochar composite soot filter device of claim 1, wherein: The high-temperature stable layer (2), the oxidation-resistant layer (3), the porous support layer (4) and the filter screen layer (5) are bonded and fixed by a high-temperature adhesive (7) with a thickness of 0.1-0.3 mm.

9. The biochar composite soot filter device of claim 1, wherein: The thickness of the high-temperature stable layer (2) is 3 mm, the thickness of the oxidation-resistant layer (3) is 1 mm, the thickness of the porous support layer (4) is 5 mm, and the thickness of the filter screen layer (5) is 2 mm.

10. The biochar composite soot filter device of claim 1, wherein: The micropore I (8) of the high-temperature stable layer (2) has a diameter of 0.3 mm and a depth of 1 mm; the micropore II (12) of the oxidation-resistant layer (3) has a diameter of 0.1 mm and a depth of 0.5 mm; the micropore III (15) of the porous support layer (4) has a diameter of 0.3 mm and a depth of 1 mm; and the micropore IV (18) of the filter screen layer (5) has a diameter of 0.05 mm and a depth of 0.3 mm.

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