A denitration and dust removal integrated ceramic fiber filter pipe treated by composite nano hydrophobic agent and a preparation method thereof

Abstract

The application provides application of a waterproof agent on a ceramic fiber filter pipe; the waterproof agent is compounded on the outer surface of the ceramic fiber filter pipe. The waterproof agent is particularly used on the outer surface of the ceramic fiber filter pipe, the ceramic fiber filter pipe (white pipe) is first treated by using a composite nano water-repellent agent, then a catalyst liquid for denitration is coated, a denitration and dust removal integrated ceramic fiber filter pipe (yellow pipe) is produced, and the denitration and dust removal integrated ceramic fiber filter pipe (yellow pipe) treated by the composite nano water-repellent agent in the early stage is obtained. The white pipe treated by the application has the basic performances of keeping high catalytic activity, keeping uniform catalyst distribution, keeping original pressure drop value, keeping strength unchanged, etc. after coating of the catalyst liquid and drying, meanwhile, the white pipe effectively improves the following unfavorable factors in the production process of the yellow pipe, such as uneven appearance color, low catalyst liquid concentration, large water consumption, long drying time of the yellow pipe, difficult production control, high energy consumption, etc., and has a wide market prospect.

Description

Technical Field

[0001] This invention belongs to the field of surface treatment technology for integrated denitrification and dust removal ceramic fiber filter tubes, and relates to the application of waterproofing agents on ceramic fiber filter tubes and a method for preparing a ceramic fiber filter tube containing a composite waterproofing agent. In particular, it relates to an integrated denitrification and dust removal ceramic fiber filter tube and its preparation method after pretreatment with a composite nano hydrophobic agent. Background Technology

[0002] In recent years, with increasingly stringent national environmental protection requirements, integrated flue gas dust removal and denitrification technology has become a research hotspot in domestic flue gas treatment. Economically, due to the excellent high-temperature resistance of ceramic fibers, cooling costs are eliminated during high-temperature filtration, and heat recovery generates profits; operation is stable, saving significant manpower and operating costs; in terms of filtration, dust emissions can be controlled to 10mg / m³. 3 The advantages are as follows: high denitrification efficiency, with nitrogen oxide removal rate reaching over 95% at 200℃-450℃; safety, the ceramic fiber tube is sturdy, temperature-resistant, and non-combustible, avoiding the danger of bag breakage and accidental burning; long-lasting performance, it is corrosion-resistant and wear-resistant, the catalyst is not easily poisoned, and its service life is over eight years; and recyclability, it can be washed and regenerated. It meets national ultra-clean emission requirements and has significant economic, environmental, and social benefits in the field of flue gas treatment.

[0003] However, at present, most domestic manufacturers of integrated denitrification and dust removal ceramic fiber filter tubes (yellow tubes) use catalyst liquid to coat ceramic fiber filter tubes (white tubes). During this process, the catalyst liquid usually overflows or seeps into the surface, resulting in the catalyst coloring on the outer surface, flange, and column head of the produced integrated denitrification and dust removal ceramic fiber filter tubes being fancy and heavily contaminated, affecting their appearance.

[0004] Therefore, finding a more suitable way to solve the above-mentioned technical problems in the existing production process, so as to maintain the stability of denitrification performance during the process of coating white tubes with catalyst liquid, and to ensure that the appearance is beautiful, clean and the color is regular, is a technical problem that needs to be solved in the current domestic denitrification and dust removal filter tube processing field. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide the application of waterproofing agents on ceramic fiber filter tubes and a method for preparing ceramic fiber filter tubes containing composite waterproofing agents, particularly a denitrification and dust removal integrated ceramic fiber filter tube pretreated with composite nano hydrophobic agents. The present invention uses composite nano hydrophobic agents to first treat the outer surface of the white tube or the flange and column head with hydrophobic properties, and then coats it with a catalyst solution to prepare a yellow tube product. This product has advantages such as stable denitrification performance, a neat and beautiful appearance, high catalyst solution concentration, low water (deionized water) consumption, short yellow tube drying time, simple preparation method, easy production control, energy saving and consumption reduction, and is more easily promoted and applied in industrial applications.

[0006] This invention provides the application of waterproofing agents on ceramic fiber filter tubes;

[0007] The waterproofing agent is applied to the outer surface of the ceramic fiber filter tube.

[0008] Preferably, the ceramic fiber filter tube includes a denitrification ceramic fiber filter tube;

[0009] The ceramic fiber filter tube includes a column head, a column body, and a flange.

[0010] The outer surface includes one or more of the outer surface of the column head, the outer surface of the column body, and the outer surface of the flange;

[0011] The waterproofing agent includes a composite waterproofing agent.

[0012] Preferably, the composite waterproofing agent comprises, by weight parts of raw materials:

[0013] 70-99 parts by weight of water;

[0014] 1 to 30 parts by weight of hydrophobic agent and / or water-repellent agent;

[0015] Inorganic binder, 0.05–0.1 parts by weight;

[0016] 0.02 to 0.05 parts by weight of silane coupling agent;

[0017] Defoamer 0.01-0.02 parts by weight;

[0018] 1 to 5 parts by weight of organic solvent.

[0019] Preferably, the composite waterproofing agent includes a composite hydrophobic agent and / or a composite water-repellent agent;

[0020] The hydrophobic agent or water-repellent agent includes one or more of fatty acid metal soaps, paraffin wax, polyolefins, organosilicon resins and fluorocarbon polymers;

[0021] The inorganic binder includes aluminum sol and / or silica sol;

[0022] The silane coupling agent includes one or more of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltri(β-methoxyethoxy)silane, and γ-methacryloxypropyltrimethoxysilane;

[0023] The defoamer includes one or more of polyether defoamers, polyester-modified silicone defoamers, and phosphate ester defoamers;

[0024] The organic solvent includes one or more of anhydrous ethanol, glycerol, and n-butanol.

[0025] Preferably, the dry basis weight of the waterproofing agent accounts for 2% to 4% of the mass of the ceramic fiber filter tube;

[0026] The coating thickness of the waterproofing agent is 0.01–2 mm;

[0027] The ceramic fiber filter tube includes an integrated ceramic fiber filter tube for denitrification and dust removal.

[0028] Preferably, the ceramic fiber filter tube includes a ceramic fiber filter tube in which a denitrification catalyst is incorporated or a ceramic fiber filter tube that does not contain a denitrification catalyst.

[0029] The denitrification catalyst includes vanadium-titanium denitrification catalysts;

[0030] The denitrification catalyst accounts for 0.01% to 10% of the mass of the ceramic fiber filter tube.

[0031] Preferably, the fiber length of the ceramic fiber filter tube is 2-3 μm;

[0032] The ceramic fiber filter tube has a length of 2.5–3.5 m;

[0033] The diameter of the ceramic fiber filter tube is 10-25 cm;

[0034] The porosity of the ceramic fiber filter tube is 65% to 85%;

[0035] The pressure drop of the ceramic fiber filter tube is 650-1100 Pa;

[0036] The C-ring compressive strength of the ceramic fiber filter tube is greater than or equal to 0.35 MPa.

[0037] This invention provides a method for preparing a ceramic fiber filter tube containing a composite waterproofing agent, comprising the following steps:

[0038] 1) After mixing water, waterproofing agent, inorganic binder, silane coupling agent, organic solvent and defoamer, the mixture is heated and mixed again to obtain a composite waterproofing emulsion;

[0039] 2) The composite waterproofing agent obtained in the above steps is sprayed onto the surface of the ceramic fiber filter tube without a catalyst to obtain a white ceramic fiber filter tube with the composite waterproofing agent on the surface.

[0040] 3) After coating the inside of the white ceramic fiber filter tube with a composite waterproofing agent obtained in the above steps with a catalyst slurry, a yellow ceramic fiber filter tube with a composite waterproofing agent is obtained.

[0041] Preferably, the mixing speed is 50–2000 r / min;

[0042] The temperature for the heating is 25–60°C;

[0043] The remixing time is 30–60 minutes;

[0044] The remixing speed is 500–1500 r / min;

[0045] The ceramic fiber filter tube yellow tube with a composite waterproofing agent on its surface is sintered to obtain the ceramic fiber filter tube product.

[0046] Preferably, the process after spraying further includes a low-temperature drying step;

[0047] The temperature for the low-temperature drying is 20–50°C;

[0048] The catalyst slurry comprises a catalyst solution and water;

[0049] The catalyst solution is a vanadium-titanium-based catalyst solution;

[0050] The mass ratio of the catalyst liquid to water is 1:(3-5).

[0051] This invention provides the application of a waterproofing agent on ceramic fiber filter tubes; the waterproofing agent is coated on the outer surface of the ceramic fiber filter tube. Compared with the prior art, this invention specifically applies the waterproofing agent to the outer surface of the ceramic fiber filter tube. First, a composite nano-hydrophobic agent is used to treat the ceramic fiber filter tube (white tube), then a denitrification catalyst liquid is coated on it to produce an integrated denitrification and dust removal ceramic fiber filter tube (yellow tube), resulting in an integrated denitrification and dust removal ceramic fiber filter tube (yellow tube) pretreated with a composite nano-hydrophobic agent.

[0052] This invention employs a composite nano-hydrophobic agent to first treat the outer surface of white tubes, or the flange and column head, with hydrophobicity, followed by coating with a catalyst solution to prepare yellow tube products. The white tubes treated with this method, after being coated with the catalyst solution and dried, retain their original high catalytic activity, uniform catalyst distribution, original pressure drop, and unchanged strength. Simultaneously, it effectively improves the unfavorable factors encountered during the yellow tube production process, such as uneven appearance and color, low catalyst solution concentration and high water consumption, long drying time, difficulty in production control, and high energy consumption. Applied to the field of denitrification and dust removal ceramic fiber filter tube (yellow tube) production technology, it has broad market prospects. The yellow tube products prepared by this invention have advantages such as stable denitrification performance, clean and beautiful appearance, high catalyst solution concentration, low water consumption, short yellow tube drying time, simple preparation method, easy production control, and energy saving and consumption reduction, making them easier to promote and apply industrially.

[0053] This invention also provides a method for preparing the integrated denitrification and dust removal ceramic fiber filter tube (yellow tube). A composite nano-hydrophobic agent solution of a certain concentration is prepared by high-speed stirring and shearing. The prepared hydrophobic agent solution exhibits good hydrophobic effect, high dispersion uniformity, and the emulsion does not coagulate, settle, or precipitate over a long period (30 days), demonstrating good solution stability. Furthermore, coating the white tube surface with the composite nano-hydrophobic agent solution provides good waterproofing without affecting the white tube's porosity, pressure drop, or strength. After the hydrophobically treated white tube is coated with a catalyst solution and dried, the yellow tube surface is clean, uniform in color, and aesthetically pleasing. Simultaneously, during the subsequent high-temperature sintering process, the composite hydrophobic components of the hydrophobically treated yellow tube transform into silica, water, carbon dioxide, etc., which adhere to the fiber surface or volatilize, without affecting the yellow tube's porosity, pressure drop, strength, or denitrification rate. Attached Figure Description

[0054] Figure 1 This is an overall effect diagram of the uncoated white tube in this invention;

[0055] Figure 2 This is a cross-sectional view of the uncoated white tube in this invention;

[0056] Figure 3 This is an overall coating effect diagram of Comparative Example 1 in this invention;

[0057] Figure 4 This is an overall coating effect diagram of Comparative Example 2 in this invention;

[0058] Figure 5 This is a diagram showing the overall coating effect of Comparative Example B in this invention;

[0059] Figure 6 This is a diagram showing the overall coating effect of Comparative Example B in this invention;

[0060] Figure 7The images shown are of the coating effect in Examples 1-5 of this invention.

[0061] Figure 8 The images show the overall coating effect and cross-sectional view of Examples 1-5 of this invention. Detailed Implementation

[0062] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the scope of the claims.

[0063] There are no particular restrictions on the source of any raw materials used in this invention; they can be purchased from the market or prepared using conventional methods known to those skilled in the art.

[0064] There are no particular restrictions on the purity of any of the raw materials used in this invention. Preferably, the raw materials used in this invention are of industrial purity or the conventional purity required in the field of denitrification ceramic fiber filter tube preparation.

[0065] All raw materials of this invention are conventional in the field, and each brand name and abbreviation is clear and distinct in its relevant application. Those skilled in the art can purchase them from the market or prepare them by conventional methods based on the brand name, abbreviation and corresponding application.

[0066] All processes in this invention are referred to by abbreviations that are common abbreviations in the field. Each abbreviation is clear and specific in its relevant application area, and those skilled in the art can understand its conventional process steps based on the abbreviation.

[0067] This invention provides the application of waterproofing agents on ceramic fiber filter tubes;

[0068] The waterproofing agent is applied to the outer surface of the ceramic fiber filter tube.

[0069] The present invention provides a ceramic fiber filter tube, comprising a ceramic fiber filter tube and a waterproofing agent compounded on the outer surface of the ceramic fiber filter tube.

[0070] In this invention, the ceramic fiber filter tube preferably includes a denitrification ceramic fiber filter tube.

[0071] In this invention, the ceramic fiber filter tube preferably includes a column head, a column body, and a flange.

[0072] In this invention, the outer surface preferably includes one or more of the outer surface of the column head, the outer surface of the column body, and the outer surface of the flange, more preferably the outer surface of the column head, the outer surface of the column body, and the outer surface of the flange (appearance A), or the outer surface of the column head and the outer surface of the flange (appearance B).

[0073] In this invention, the waterproofing agent preferably comprises a composite waterproofing agent.

[0074] In this invention, the composite waterproofing agent preferably comprises, by weight parts of raw materials:

[0075]

[0076]

[0077] In this invention, the amount of water added is preferably 70 to 99 parts by weight, more preferably 75 to 94 parts by weight, and even more preferably 80 to 89 parts by weight.

[0078] In this invention, the amount of the hydrophobic agent and / or hydrophobic agent added is preferably 1 to 30 parts by weight, more preferably 6 to 25 parts by weight, and even more preferably 11 to 20 parts by weight. Specifically, the hydrophobic agent / hydrophobic agent is a nano-sized particle, that is, the hydrophobic agent is specifically a nano-hydrophobic agent, and the hydrophobic agent is specifically a nano-hydrophobic agent.

[0079] In this invention, the amount of inorganic binder added is preferably 0.05 to 0.1 parts by weight, more preferably 0.06 to 0.09 parts by weight, and even more preferably 0.07 to 0.08 parts by weight.

[0080] In this invention, the amount of the silane coupling agent added is preferably 0.02 to 0.05 parts by weight, more preferably 0.025 to 0.045 parts by weight, and even more preferably 0.03 to 0.04 parts by weight.

[0081] In this invention, the amount of defoamer added is preferably 0.01 to 0.02 parts by weight, more preferably 0.012 to 0.018 parts by weight, and even more preferably 0.014 to 0.016 parts by weight.

[0082] In this invention, the amount of organic solvent added is preferably 1 to 5 parts by weight, more preferably 1.8 to 4.2 parts by weight, and even more preferably 2.6 to 3.4 parts by weight.

[0083] In this invention, the composite waterproofing agent preferably includes a composite hydrophobic agent and / or a composite water-repellent agent, more preferably a composite hydrophobic agent or a composite water-repellent agent.

[0084] In this invention, the hydrophobic agent or water-repellent agent preferably includes one or more of fatty acid metal soaps, paraffin wax, polyolefins, silicone resins and fluorocarbon polymers, and more preferably fatty acid metal soaps, paraffin wax, polyolefins, silicone resins or fluorocarbon polymers.

[0085] In this invention, the inorganic binder preferably includes aluminum sol and / or silica sol, more preferably sol or silica sol.

[0086] In this invention, the silane coupling agent preferably includes one or more of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltri(β-methoxyethoxy)silane and γ-methacryloxypropyltrimethoxysilane, more preferably vinyltriethoxysilane, vinyltrimethoxysilane, vinyltri(β-methoxyethoxy)silane or γ-methacryloxypropyltrimethoxysilane.

[0087] In this invention, the defoamer preferably includes one or more of polyether defoamers, polyester-modified silicone defoamers, and phosphate ester defoamers, and more preferably polyether defoamers, polyester-modified silicone defoamers, or phosphate ester defoamers.

[0088] In this invention, the organic solvent preferably includes one or more of anhydrous ethanol, glycerol and n-butanol, more preferably anhydrous ethanol, glycerol or n-butanol.

[0089] In this invention, the dry basis mass of the waterproofing agent is preferably 2% to 4% of the mass content of the ceramic fiber filter tube, more preferably 2.4% to 3.6%, and even more preferably 2.8% to 3.2%.

[0090] In this invention, the coating thickness of the waterproofing agent is preferably 0.01-2 mm, more preferably 0.1-1.5 mm, and even more preferably 0.5-1.0 mm.

[0091] In this invention, the ceramic fiber filter tube preferably includes an integrated denitrification and dust removal ceramic fiber filter tube.

[0092] In this invention, the ceramic fiber filter tube preferably includes a ceramic fiber filter tube (yellow tube) in which a denitrification catalyst is incorporated, or a ceramic fiber filter tube (white tube) that does not contain a denitrification catalyst.

[0093] In this invention, the denitrification catalyst preferably includes a vanadium-titanium denitrification catalyst.

[0094] In this invention, the mass content of the denitrification catalyst in the ceramic fiber filter tube is preferably 0.01% to 10%, more preferably 0.1% to 6%, and even more preferably 1% to 2%.

[0095] In this invention, the fiber length of the ceramic fiber filter tube is preferably 2-3 μm, more preferably 2.2-2.8 μm, and even more preferably 2.4-2.6 μm.

[0096] In this invention, the length of the ceramic fiber filter tube is preferably 2.5 to 3.5 m, more preferably 2.7 to 3.3 m, and even more preferably 2.9 to 3.1 m.

[0097] In this invention, the diameter of the ceramic fiber filter tube is preferably 10-25 cm, more preferably 13-22 cm, and even more preferably 16-19 cm.

[0098] In this invention, the porosity of the ceramic fiber filter tube is preferably 65% ​​to 85%, more preferably 69% to 81%, and even more preferably 73% to 77%.

[0099] In this invention, the pressure drop of the ceramic fiber filter tube is preferably 650-1100 Pa, more preferably 750-1000 Pa, and even more preferably 850-900 Pa.

[0100] In this invention, the C-ring compressive strength of the ceramic fiber filter tube is preferably greater than or equal to 0.35 MPa, more preferably greater than or equal to 0.4 MPa, and more preferably greater than or equal to 0.45 MPa.

[0101] This invention provides a method for preparing a ceramic fiber filter tube containing a composite waterproofing agent, comprising the following steps:

[0102] 1) After mixing water, waterproofing agent, inorganic binder, silane coupling agent, organic solvent and defoamer, the mixture is heated and mixed again to obtain a composite waterproofing emulsion;

[0103] 2) The composite waterproofing agent obtained in the above steps is sprayed onto the surface of the ceramic fiber filter tube without a catalyst to obtain a white ceramic fiber filter tube with the composite waterproofing agent on the surface.

[0104] 3) After coating the inside of the white ceramic fiber filter tube with a composite waterproofing agent obtained in the above steps with a catalyst slurry, a yellow ceramic fiber filter tube with a composite waterproofing agent is obtained.

[0105] The present invention first mixes water, waterproofing agent, inorganic binder, silane coupling agent, organic solvent and defoamer, then heats up and mixes again to obtain a composite waterproofing agent emulsion.

[0106] In this invention, the mixing speed is preferably 50-2000 r / min, more preferably 450-1500 r / min, and even more preferably 950-1000 r / min.

[0107] In this invention, the heating temperature is preferably 25-60°C, more preferably 30-55°C, more preferably 35-50°C, and even more preferably 40-45°C.

[0108] In this invention, the remixing time is preferably 30-60 min, more preferably 35-55 min, and even more preferably 40-50 min.

[0109] In this invention, the remixing speed is preferably 500-1500 r / min, more preferably 700-1300 r / min, and even more preferably 900-1100 r / min.

[0110] The present invention further sprays the composite waterproofing agent obtained in the above steps onto the surface of the ceramic fiber filter tube without a catalyst to obtain a white ceramic fiber filter tube with the composite waterproofing agent on the surface.

[0111] In this invention, the spraying process preferably includes a low-temperature drying step.

[0112] In this invention, the temperature of the low-temperature drying is preferably 20-50°C, more preferably 25-45°C, and even more preferably 30-40°C.

[0113] Finally, the white ceramic fiber filter tube with a composite waterproofing agent on its surface, obtained by the above steps, is coated with a catalyst slurry to obtain a yellow ceramic fiber filter tube with a composite waterproofing agent on its surface.

[0114] In this invention, the catalyst slurry preferably comprises a catalyst liquid and water.

[0115] In this invention, the catalyst liquid is preferably a vanadium-titanium catalyst liquid.

[0116] In this invention, the mass ratio of the catalyst liquid to water is preferably 1:(3-5), more preferably 1:(3.4-4.6), and even more preferably 1:(3.8-4.2).

[0117] In this invention, the ceramic fiber filter tube yellow tube with a composite waterproofing agent on its surface is sintered to obtain the ceramic fiber filter tube product.

[0118] In this invention, the sintering temperature is preferably 300-400°C, more preferably 320-380°C, and even more preferably 340-360°C.

[0119] In this invention, the sintering time is preferably 2 to 10 hours, more preferably 3 to 9 hours, more preferably 4 to 8 hours, and even more preferably 5 to 7 hours.

[0120] This invention aims to complete and refine the overall technical solution, better ensuring the performance and appearance of the integrated denitrification and dust removal ceramic fiber filter tube. Specifically, the aforementioned integrated denitrification and dust removal ceramic fiber filter tube pretreated with a composite nano-hydrophobic agent and its preparation method may include the following:

[0121] This invention can provide integrated ceramic fiber filter tubes for denitrification and dust removal in various appearances, specifically:

[0122] Product A preparation method: First, deionized water, hydrophobic agent, inorganic binder, silane coupling agent, organic solvent, etc. are mixed evenly in a certain proportion; then, the mixture is applied quantitatively and evenly to the flange and column head of the white pipe using a spraying device (the specific dimensions of the flange and column head are customized according to customer requirements). After drying at a low temperature of 20-50℃, the catalyst solution is coated and dried.

[0123] Product B preparation method: First, deionized water, hydrophobic agent, inorganic binder, silane coupling agent, organic solvent, etc. are mixed evenly in a certain proportion; then, the mixture is quantitatively and evenly coated on the outer surface of the white tube (including the flange and column head) using a spraying device. After drying at a low temperature of 20-50℃, the catalyst solution is coated and dried.

[0124] This invention discloses a method for preparing integrated denitrification and dust removal ceramic fiber filter tubes (yellow tubes) by treating ceramic fiber filter tubes (white tubes) with a composite hydrophobic agent and then coating them with a denitrification catalyst solution. The method includes the following steps:

[0125] (1) Add 70-90 parts by weight of deionized water, 1-30 parts by weight of hydrophobic agent, 0.05-0.1 parts by weight of inorganic binder, 0.02-0.05 parts by weight of silane coupling agent, 1-5 parts by weight of organic solvent, and 0.01-0.02 parts by weight of defoamer to a high-speed mixing vessel, start stirring, control the speed at 50-2000 r / min, raise the temperature to 25-60℃, and stir for 30-60 min to prepare a composite nano hydrophobic agent emulsion of a certain concentration;

[0126] (2) The dry weight of the composite nano hydrophobic agent / the weight of the white tube is about 1% to 10%. The composite hydrophobic agent emulsion is added to the quantitative spraying device and coated on the white tube according to the appearance A and appearance B requirements. Then it is dried at a low temperature of 20 to 50°C.

[0127] (3) Prepare a coating slurry by diluting the catalyst solution and deionized water at a ratio of 1:3 to 5. Apply a quantitative amount of the catalyst solution to the white tube according to the appearance requirements A and B to prepare a yellow tube.

[0128] The composite hydrophobic emulsion is composed of the following components by weight percentage:

[0129] Deionized water: 70-99 parts, hydrophobic agent: 1-30 parts, inorganic binder: 0.05-0.1 parts, organic solvent: 1-5 parts, silane coupling agent: 0.02-0.05 parts, defoamer: 0.01-0.02 parts.

[0130] Specifically, the hydrophobic agent is one or more of fatty acid metal soaps, paraffin wax, polyolefins, organosilicon resins, and fluorocarbon polymers.

[0131] Specifically, the hydrophobic agent is one or a mixture of two of the following: organosilicon resin, fatty acid metal soap, and paraffin wax, with a preferred dosage of 10-25%.

[0132] Specifically, the inorganic binder is one or more of aluminum sol and silica sol used in combination.

[0133] Specifically, the silane coupling agent is one or a mixture of two of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltri(β-methoxyethoxy)silane, and γ-methacryloyloxypropyltrimethoxysilane, and its dosage is preferably 0.02-0.04%.

[0134] Specifically, the organic solvent is one or more of anhydrous ethanol, glycerol, and n-butanol.

[0135] Specifically, the defoamer is one or more of polyethers, polyester-modified silicones, and phosphate esters used in combination.

[0136] Specifically, the catalyst liquid is a vanadium-titanium catalyst liquid (purchased externally), with the main component of the catalyst accounting for 30%, and the remainder being deionized water.

[0137] Specifically, the dry weight ratio of the composite nano hydrophobic agent to the weight of the white tube is approximately 2% to 4%.

[0138] Specifically, in this invention, the stirring speed is 500–1500 r / min. The mixing temperature is controlled within the range of 40–50°C using hot water in the jacket of the mixing vessel.

[0139] The present invention provides the application of waterproofing agents on ceramic fiber filter tubes, a denitrification and dust removal integrated ceramic fiber filter tube pretreated with a composite nano hydrophobic agent, and its preparation method. Specifically, the present invention applies a waterproofing agent to the outer surface of the ceramic fiber filter tube. First, the ceramic fiber filter tube (white tube) is treated with a composite nano hydrophobic agent, then coated with a denitrification catalyst liquid to produce a denitrification and dust removal integrated ceramic fiber filter tube (yellow tube), thus obtaining a denitrification and dust removal integrated ceramic fiber filter tube (yellow tube) pretreated with a composite nano hydrophobic agent.

[0140] This invention employs a composite nano-hydrophobic agent to first treat the outer surface of white tubes, or the flange and column head, with hydrophobicity, followed by coating with a catalyst solution to prepare yellow tube products. The white tubes treated with this method, after being coated with the catalyst solution and dried, retain their original high catalytic activity, uniform catalyst distribution, original pressure drop, and unchanged strength. Simultaneously, it effectively improves the unfavorable factors encountered during the yellow tube production process, such as uneven appearance and color, low catalyst solution concentration and high water consumption, long drying time, difficulty in production control, and high energy consumption. Applied to the field of denitrification and dust removal ceramic fiber filter tube (yellow tube) production technology, it has broad market prospects. The yellow tube products prepared by this invention have advantages such as stable denitrification performance, clean and beautiful appearance, high catalyst solution concentration, low water consumption, short yellow tube drying time, simple preparation method, easy production control, and energy saving and consumption reduction, making them easier to promote and apply industrially.

[0141] This invention also provides a method for preparing the integrated denitrification and dust removal ceramic fiber filter tube (yellow tube). A composite nano-hydrophobic agent solution of a certain concentration is prepared by high-speed stirring and shearing. The prepared hydrophobic agent solution exhibits good hydrophobic effect, high dispersion uniformity, and the emulsion does not coagulate, settle, or precipitate over a long period (30 days), demonstrating good solution stability. Furthermore, coating the white tube surface with the composite nano-hydrophobic agent solution provides good waterproofing without affecting the white tube's porosity, pressure drop, or strength. After the hydrophobically treated white tube is coated with a catalyst solution and dried, the yellow tube surface is clean, uniform in color, and aesthetically pleasing. Simultaneously, during the subsequent high-temperature sintering process, the composite hydrophobic components of the hydrophobically treated yellow tube transform into silica, water, carbon dioxide, etc., which adhere to the fiber surface or volatilize, without affecting the yellow tube's porosity, pressure drop, strength, or denitrification rate.

[0142] To further illustrate the present invention, the following detailed description, in conjunction with embodiments, describes the application of the waterproofing agent provided by the present invention on ceramic fiber filter tubes and a method for preparing a ceramic fiber filter tube containing a composite waterproofing agent. However, it should be understood that these embodiments are implemented under the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operating procedures. They are only for further illustrating the features and advantages of the present invention, and are not intended to limit the scope of the claims of the present invention. The scope of protection of the present invention is not limited to the following embodiments.

[0143] Example 1

[0144] A method for preparing integrated denitrification and dust removal ceramic fiber filter tubes by treating ceramic fiber filter tubes (white tubes) with a composite hydrophobic agent and then coating them with a denitrification catalyst solution consists of the following steps:

[0145] (1) Add 70 parts by weight of deionized water, 25 parts by weight of hydrophobic agent, 0.1 parts by weight of inorganic binder, 0.02 parts by weight of silane coupling agent, 4.87 parts by weight of organic solvent and 0.01 parts by weight of defoamer to a high-speed mixing vessel, start stirring, control the speed at 1500 r / min, raise the temperature to 50℃, stir for 60 min, and prepare a 25% concentration composite nano hydrophobic agent solution.

[0146] (2) Appearance A: Add the composite nano hydrophobic agent solution to the spraying device (commercially available spray bottle); spray the white tube to the required size according to the appearance A scheme. Stop spraying when the weight gain reaches 2.5% of the weight of the white tube, and put it into the oven for drying treatment. The drying temperature is set to 50℃.

[0147] Appearance B: Add the composite nano hydrophobic agent solution to the spraying device (commercially available spray bottle); spray the white tube evenly according to the required dimensions according to Appearance B. Stop spraying when the weight gain reaches 25% of the weight of the white tube, and put it into the oven for drying treatment. Set the drying temperature to 50℃.

[0148] (3) Appearance A: Mix the catalyst liquid and deionized water at a weight ratio of 1:3 and add them evenly to the spraying device (self-made quantitative spraying). Stop spraying when the weight gain reaches 100% of the weight of the white tube after hydrophobic treatment. Place it in an oven for drying treatment and set the drying temperature to 100℃.

[0149] Appearance B: Mix the catalyst liquid and deionized water in a weight ratio of 1:1 and add them evenly to the spraying device (self-made quantitative spraying). Stop spraying when the weight gain reaches 50% of the weight of the white tube after hydrophobic treatment. Place it in an oven for drying treatment and set the drying temperature to 100℃.

[0150] Example 2

[0151] A method for preparing integrated denitrification and dust removal ceramic fiber filter tubes by treating ceramic fiber filter tubes (white tubes) with a composite hydrophobic agent and then coating them with a denitrification catalyst solution consists of the following steps:

[0152] (1) Add 90 parts by weight of deionized water, 5 parts by weight of hydrophobic agent, 0.05 parts by weight of inorganic binder, 0.05 parts by weight of silane coupling agent, 4.89 parts by weight of organic solvent and 0.01 parts by weight of defoamer to a high-speed mixing vessel, start stirring, control the speed at 500 r / min, raise the temperature to 40℃, stir for 30 min, and prepare a 5% concentration composite nano hydrophobic agent solution.

[0153] (2) Appearance A: Add the composite nano hydrophobic agent solution to the spraying device (commercially available spray bottle); spray the white tube to the required size according to the appearance A scheme. Stop spraying when the weight gain reaches 2.5% of the weight of the white tube, and put it into the oven for drying treatment. The drying temperature is set to 50℃.

[0154] Appearance B: Add the composite nano hydrophobic agent solution to the spraying device (commercially available spray bottle); spray the white tube evenly according to the required dimensions according to Appearance B. Stop spraying when the weight gain reaches 25% of the weight of the white tube, and put it into the oven for drying treatment. Set the drying temperature to 50℃.

[0155] (3) Appearance A: Mix the catalyst liquid and deionized water at a weight ratio of 1:3 and add them evenly to the spraying device (self-made quantitative spraying). Stop spraying when the weight gain reaches 100% of the weight of the white tube after hydrophobic treatment. Place it in an oven for drying treatment and set the drying temperature to 100℃.

[0156] Appearance B: Mix the catalyst liquid and deionized water in a weight ratio of 1:1 and add them evenly to the spraying device (self-made quantitative spraying). Stop spraying when the weight gain reaches 50% of the weight of the white tube after hydrophobic treatment. Place it in an oven for drying treatment and set the drying temperature to 100℃.

[0157] Example 3

[0158] A method for preparing integrated denitrification and dust removal ceramic fiber filter tubes by treating ceramic fiber filter tubes (white tubes) with a composite hydrophobic agent and then coating them with a denitrification catalyst solution consists of the following steps:

[0159] (1) Add 80 parts by weight of deionized water, 15 parts by weight of hydrophobic agent, 0.08 parts by weight of inorganic binder, 0.03 parts by weight of silane coupling agent, 4.875 parts by weight of organic solvent and 0.015 parts by weight of defoamer to a high-speed mixing vessel, start stirring, control the speed at 1000 r / min, raise the temperature to 45℃, stir for 45 min, and prepare a 15% concentration composite nano hydrophobic agent solution.

[0160] (2) Appearance A: Add the composite nano hydrophobic agent solution to the spraying device (commercially available spray bottle); spray the white tube to the required size according to the appearance A scheme. Stop spraying when the weight gain reaches 2.5% of the weight of the white tube, and put it into the oven for drying treatment. The drying temperature is set to 50℃.

[0161] Appearance B: Add the composite nano hydrophobic agent solution to the spraying device (commercially available spray bottle); spray the white tube evenly according to the required dimensions according to Appearance B. Stop spraying when the weight gain reaches 25% of the weight of the white tube, and put it into the oven for drying treatment. Set the drying temperature to 50℃.

[0162] (3) Appearance A: Mix the catalyst liquid and deionized water at a weight ratio of 1:3 and add them evenly to the spraying device (self-made quantitative spraying). Stop spraying when the weight gain reaches 100% of the weight of the white tube after hydrophobic treatment. Place it in an oven for drying treatment and set the drying temperature to 100℃.

[0163] Appearance B: Mix the catalyst liquid and deionized water in a weight ratio of 1:1 and add them evenly to the spraying device (self-made quantitative spraying). Stop spraying when the weight gain reaches 50% of the weight of the white tube after hydrophobic treatment. Place it in an oven for drying treatment and set the drying temperature to 100℃.

[0164] Example 4

[0165] The method for preparing integrated denitrification and dust removal ceramic fiber filter tubes by treating ceramic fiber filter tubes (white tubes) with a composite hydrophobic agent and then coating them with a denitrification catalyst solution consists of the following steps:

[0166] (1) Add 75 parts by weight of deionized water, 20 parts by weight of hydrophobic agent, 0.08 parts by weight of inorganic binder, 0.03 parts by weight of silane coupling agent, 4.875 parts by weight of organic solvent and 0.015 parts by weight of defoamer to a high-speed mixing vessel, start stirring, control the speed at 1000 r / min, raise the temperature to 45℃, stir for 45 min, and prepare a 20% concentration composite nano hydrophobic agent solution.

[0167] (2) Appearance A: Add the composite nano hydrophobic agent solution to the spraying device (commercially available spray bottle); spray the white tube to the required size according to the appearance A scheme. Stop spraying when the weight gain reaches 2.5% of the weight of the white tube, and put it into the oven for drying treatment. The drying temperature is set to 50℃.

[0168] Appearance B: Add the composite nano hydrophobic agent solution to the spraying device (commercially available spray bottle); spray the white tube evenly according to the required dimensions according to Appearance B. Stop spraying when the weight gain reaches 25% of the weight of the white tube, and put it into the oven for drying treatment. Set the drying temperature to 50℃.

[0169] (3) Appearance A: Mix the catalyst liquid and deionized water at a weight ratio of 1:3 and add them evenly to the spraying device (self-made quantitative spraying). Stop spraying when the weight gain reaches 100% of the weight of the white tube after hydrophobic treatment. Place it in an oven for drying treatment and set the drying temperature to 100℃.

[0170] Appearance B: Mix the catalyst liquid and deionized water in a weight ratio of 1:1 and add them evenly to the spraying device (self-made quantitative spraying). Stop spraying when the weight gain reaches 50% of the weight of the white tube after hydrophobic treatment. Place it in an oven for drying treatment and set the drying temperature to 100℃.

[0171] Example 5

[0172] The method for preparing integrated denitrification and dust removal ceramic fiber filter tubes by treating ceramic fiber filter tubes (white tubes) with a composite hydrophobic agent and then coating them with a denitrification catalyst solution consists of the following steps:

[0173] (1) Add 85 parts by weight of deionized water, 10 parts by weight of hydrophobic agent, 0.08 parts by weight of inorganic binder, 0.03 parts by weight of silane coupling agent, 4.875 parts by weight of organic solvent and 0.015 parts by weight of defoamer to a high-speed mixing vessel, start stirring, control the speed at 1000 r / min, raise the temperature to 45℃, stir for 45 min, and prepare a 10% concentration composite nano hydrophobic agent solution.

[0174] (2) Appearance A: Add the composite nano hydrophobic agent solution to the spraying device (commercially available spray bottle); spray the white tube to the required size according to the appearance A scheme. Stop spraying when the weight gain reaches 2.5% of the weight of the white tube, and put it into the oven for drying treatment. The drying temperature is set to 50℃.

[0175] Appearance B: Add the composite nano hydrophobic agent solution to the spraying device (commercially available spray bottle); spray the white tube evenly according to the required dimensions according to Appearance B. Stop spraying when the weight gain reaches 25% of the weight of the white tube, and put it into the oven for drying treatment. Set the drying temperature to 50℃.

[0176] (3) Appearance A: Mix the catalyst liquid and deionized water at a weight ratio of 1:3 and add them evenly to the spraying device (self-made quantitative spraying). Stop spraying when the weight gain reaches 100% of the weight of the white tube after hydrophobic treatment. Place it in an oven for drying treatment and set the drying temperature to 100℃.

[0177] Appearance B: Mix the catalyst liquid and deionized water in a weight ratio of 1:1 and add them evenly to the spraying device (self-made quantitative spraying). Stop spraying when the weight gain reaches 50% of the weight of the white tube after hydrophobic treatment. Place it in an oven for drying treatment and set the drying temperature to 100℃.

[0178] Comparative Example 1

[0179] The production of integrated denitrification and dust removal ceramic fiber filter tubes (white tubes) involves directly coating them with a denitrification catalyst solution without treatment with a composite hydrophobic agent. This process consists of the following steps:

[0180] Appearance A: Mix the catalyst liquid and deionized water at a weight ratio of 1:3 and add them evenly to the spraying device (self-made quantitative spraying). Stop spraying when the weight gain reaches 100% of the weight of the white tube, and put it into the oven for drying treatment. The drying temperature is set to 100℃.

[0181] Appearance B: Mix the catalyst liquid and deionized water in a weight ratio of 1:1 and add them evenly to the spraying device (self-made quantitative spraying). Stop spraying when the weight gain reaches 50% of the weight of the white tube, and put it into the oven for drying treatment. The drying temperature is set to 100℃.

[0182] Comparative Example 2

[0183] The production of integrated denitrification and dust removal ceramic fiber filter tubes (white tubes) involves directly coating them with a denitrification catalyst solution (comparative example 1, twice the amount) without treatment with a composite hydrophobic agent. This process comprises the following steps:

[0184] Appearance A: Mix the catalyst liquid and deionized water at a weight ratio of 1:3 and add them evenly to the spraying device (self-made quantitative spraying). Stop spraying when the weight gain reaches 200% of the weight of the white tube, and put it into the oven for drying treatment. The drying temperature is set to 100℃.

[0185] Appearance B: Mix the catalyst liquid and deionized water in a weight ratio of 1:1 and add them evenly to the spraying device (self-made quantitative spraying). Stop spraying when the weight gain reaches 100% of the weight of the white tube, and put it into the oven for drying treatment. The drying temperature is set to 100℃.

[0186] The yellow tubes prepared in the embodiments and comparative examples of the present invention were subjected to high-temperature sintering. The yellow tube samples were placed in a muffle furnace and dried for 2 to 10 hours at a temperature set between 300 and 400°C.

[0187] The yellow tubes prepared in the embodiments and comparative examples of the present invention were subjected to routine denitrification performance tests.

[0188] See Table 1, which compares the conventional and denitrification performance test data of the yellow tubes prepared in the embodiments and comparative examples of the present invention. (The white tube weighs 10 kg and has dimensions of 150 mm * 3000 mm).

[0189] Table 1

[0190]

[0191]

[0192] As can be seen from the comparative data in Table 1, compared with the production of integrated denitrification and dust removal ceramic fiber filter tubes by directly coating with denitrification catalyst solution without treatment with composite hydrophobic agent, the white tubes pre-treated in Examples 1-5, after coating with catalyst solution and drying, maintain the original high catalytic activity, original pressure drop value, and no change in strength, while also having a high catalyst solution concentration, low water (deionized water) consumption, short drying time for yellow tubes, easy production control, and low energy consumption. This technology can be applied to the production technology of denitrification and dust removal ceramic fiber filter tubes (yellow tubes), achieving energy saving and consumption reduction.

[0193] Coating effect experimental evaluation

[0194] The appearance of the white tubes and the yellow tubes prepared in Examples 1-5 and Comparative Examples 1-2 are shown in the attached figures.

[0195] See Figure 1 , Figure 1 This is an overall effect diagram of the uncoated white tube in this invention.

[0196] See Figure 2 , Figure 2 This is a cross-sectional view of the uncoated white tube in this invention.

[0197] Depend on Figure 1 and Figure 2 As can be seen, the inner and outer surfaces of the white pipe are white, and it is divided into three parts: the head, the body, and the flange.

[0198] See Figure 3 , Figure 3 This is an overall coating effect diagram of Comparative Example 1 in this invention.

[0199] Depend on Figure 3 It can be seen that without hydrophobic treatment and with low dilution water consumption, the outer surface is severely contaminated at the column head and flange due to catalyst migration, and the column body has uneven and gaudy color; therefore, the denitrification efficiency is low and does not meet the standard requirements (denitrification rate requirement ≥95%).

[0200] See Figure 4 , Figure 4 This is an overall coating effect diagram of Comparative Example 2 in this invention.

[0201] Depend on Figure 4 It can be seen that, without hydrophobic treatment and with a large amount of dilution water, although the column color meets the standard and the denitrification efficiency is qualified, catalyst migration on the outer surface is more serious, resulting in severe contamination and no clear boundary at the column head and flange.

[0202] See Figure 5 , Figure 5 This is a diagram showing the overall coating effect of Comparative Example B in this invention.

[0203] Depend on Figure 5 It can be seen that without hydrophobic treatment and with even lower dilution water consumption: the outer surface has uneven color, gaudy appearance, and white spots due to poor catalyst permeability, resulting in low denitrification efficiency and failing to meet the standard requirements (denitrification rate requirement ≥95%).

[0204] See Figure 6 , Figure 6 This is a diagram showing the overall coating effect of Comparative Example B in this invention.

[0205] Depend on Figure 6It can be seen that, without hydrophobic treatment and with a large amount of dilution water, although the column color meets the standard and the denitrification efficiency is qualified, catalyst migration on the outer surface is more serious, resulting in severe contamination and no clear boundary at the column head and flange.

[0206] See Figure 7 , Figure 7 The images shown are of the coating effect in Examples 1-5 of this invention.

[0207] Depend on Figure 7 It can be seen that after the flange and column head are treated with hydrophobic material, the surface hydrophobic effect is good, and the color of the flange and column head is uniform and there is a clear dividing line at the connection between the flange and column body.

[0208] See Figure 8 , Figure 8 The images show the overall coating effect and cross-sectional view of Examples 1-5 of this invention.

[0209] Depend on Figure 8 It can be seen that after the hydrophobic treatment, the flange, column head, and column body have good surface hydrophobic effect. The flange, column head, and column body maintain the original smooth outer surface of the white tube. The catalyst is evenly dispersed inside, forming an egg yolk shape with obvious dividing lines.

[0210] As can be seen from the actual appearance drawings and cross-sections, flanges, and column heads of the above embodiments and comparative examples, compared with the production of integrated denitrification and dust removal ceramic fiber filter tubes by directly coating with denitrification catalyst solution without composite hydrophobic agent treatment, the white tubes pre-treated in Examples 1-5, after being coated with catalyst solution and dried, exhibit uniform catalyst distribution and effectively improve the uneven appearance color, low catalyst solution concentration, large water (deionized water) consumption, long drying time, difficult production control, and high energy consumption of yellow tubes during the production process. Therefore, their application in the field of denitrification and dust removal ceramic fiber filter tube (yellow tube) production technology has broad market prospects.

[0211] The foregoing provides a detailed description of the integrated denitrification and dust removal ceramic fiber filter tube pretreated with a composite nano-hydrophobic agent and its preparation method. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that for those skilled in the art, several improvements and modifications can be made to the invention without departing from the principles, and these improvements and modifications also fall within the scope of protection of the claims. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements that are not different from the wording of the claims, or if they include equivalent structural elements that are not substantially different from the wording of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. A method for preparing a ceramic fiber filter tube containing a composite waterproofing agent, characterized in that, Includes the following steps: 1) After mixing water, waterproofing agent, inorganic binder, silane coupling agent, organic solvent and defoamer, the mixture is heated and mixed again to obtain a composite waterproofing emulsion; 2) The composite waterproofing agent obtained in the above steps is sprayed onto the surface of the ceramic fiber filter tube without a catalyst to obtain a white ceramic fiber filter tube with the composite waterproofing agent on the surface. 3) After coating the inside of the white ceramic fiber filter tube with a composite waterproofing agent obtained in the above steps with catalyst slurry, a yellow ceramic fiber filter tube with a composite waterproofing agent is obtained.

2. The preparation method according to claim 1, characterized in that, The mixing speed is 50~2000 r / min; The temperature for the heating is 25~60℃; The remixing time is 30-60 minutes; The remixing speed is 500~1500 r / min; The ceramic fiber filter tube yellow tube with a composite waterproofing agent on its surface is sintered to obtain the ceramic fiber filter tube product.

3. The preparation method according to claim 1, characterized in that, The process after spraying also includes a low-temperature drying step; The temperature for the low-temperature drying is 20~50℃; The catalyst slurry comprises a catalyst solution and water; The catalyst solution is a vanadium-titanium-based catalyst solution; The mass ratio of the catalyst liquid to water is 1:(3~5).

4. The preparation method according to claim 1, characterized in that, The composite waterproofing agent is applied to the outer surface of the ceramic fiber filter tube; The ceramic fiber filter tube includes a denitrification ceramic fiber filter tube.

5. The preparation method according to claim 4, characterized in that, The ceramic fiber filter tube includes a column head, a column body, and a flange. The outer surface includes one or more of the column head outer surface, column body outer surface, and flange outer surface.

6. The preparation method according to claim 1, characterized in that, The composite waterproofing agent, by weight of raw materials, comprises: 70-99 parts by weight of water; 1-30 parts by weight of hydrophobic agent and / or water-repellent agent; Inorganic binder, 0.05~0.1 parts by weight; 0.02~0.05 parts by weight of silane coupling agent; Defoamer 0.01~0.02 parts by weight; 1 to 5 parts by weight of organic solvent.

7. The preparation method according to claim 6, characterized in that, The hydrophobic agent or water-repellent agent includes one or more of fatty acid metal soaps, paraffin wax, polyolefins, organosilicon resins and fluorocarbon polymers; The inorganic binder includes aluminum sol and / or silica sol; The silane coupling agent includes one or more of vinyltriethoxysilane, vinyltrimethoxysilane, vinyltri(β-methoxyethoxy)silane and γ-methacryloxypropyltrimethoxysilane; The defoamer includes one or more of polyether defoamers, polyester-modified silicone defoamers, and phosphate ester defoamers; The organic solvent includes one or more of anhydrous ethanol, glycerol, and n-butanol.

8. The preparation method according to claim 1, characterized in that, The dry basis weight of the composite waterproofing agent accounts for 2% to 4% of the mass of the ceramic fiber filter tube; The coating thickness of the composite waterproofing agent is 0.01~2mm; The ceramic fiber filter tube includes an integrated ceramic fiber filter tube for denitrification and dust removal.

9. The preparation method according to claim 4, characterized in that, The denitrification ceramic fiber filter tube includes a ceramic fiber filter tube in which a denitrification catalyst is incorporated. The denitrification catalyst includes vanadium-titanium denitrification catalysts; The mass content of the denitrification catalyst in the ceramic fiber filter tube is 0.01% to 10%.

10. The preparation method according to claim 1, characterized in that, The ceramic fiber filter tube has a fiber length of 2~3μm; The length of the ceramic fiber filter tube is 2.5~3.5m; The diameter of the ceramic fiber filter tube is 10~25cm; The porosity of the ceramic fiber filter tube is 65%~85%; The pressure drop of the ceramic fiber filter tube is 650~1100Pa; The C-ring compressive strength of the ceramic fiber filter tube is greater than or equal to 0.35 MPa.

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