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CN-117160144-B - Denitration and dust removal integrated ceramic fiber filter tube subjected to pretreatment of composite nano hydrophobic agent and preparation method thereof

CN117160144BCN 117160144 BCN117160144 BCN 117160144BCN-117160144-B

Abstract

The invention provides application of a waterproof agent on a ceramic fiber filter tube, wherein the waterproof agent is compounded on the outer surface of the ceramic fiber filter tube. The invention particularly uses a waterproof agent on the outer surface of a ceramic fiber filter tube, adopts a composite nano hydrophobic agent to treat the ceramic fiber filter tube (white tube) and then coats catalyst medium for denitration to produce a denitration and dust removal integrated ceramic fiber filter tube (yellow tube), and obtains the denitration and dust removal integrated ceramic fiber filter tube (yellow tube) which is subjected to the pretreatment of the composite nano hydrophobic agent. The white pipe treated by the method has the advantages of high catalytic activity, uniform catalyst distribution, original pressure drop value, unchanged strength and other basic performances, and simultaneously, the method effectively improves the adverse factors of uneven appearance color, low catalyst liquid concentration, large water consumption, long drying time, difficult control of production, high energy consumption and the like in the production process of the yellow pipe after being coated and dried by the catalyst liquid, and has wide market prospect.

Inventors

  • HU JIANQIANG
  • LIU PENG
  • WANG YING
  • WANG YANFEI
  • LUO CHENG
  • SUN SHIDONG

Assignees

  • 淄博华源科技创新发展有限公司

Dates

Publication Date
20260512
Application Date
20230922

Claims (10)

  1. 1. The preparation method of the ceramic fiber filter tube containing the composite waterproof agent is characterized by comprising the following steps of: 1) Mixing water, a waterproof agent, an inorganic binder, a silane coupling agent, an organic solvent and a defoaming agent, heating and mixing again to obtain a composite waterproof agent emulsion; 2) Spraying the composite waterproof agent obtained in the steps on the surface of the ceramic fiber filter tube without the catalyst to obtain a ceramic fiber filter tube white tube with the composite waterproof agent on the surface; 3) And (3) coating catalyst slurry on the inner part of the ceramic fiber filter tube with the composite waterproof agent on the surface, thus obtaining the ceramic fiber filter tube yellow tube with the composite waterproof agent on the surface.
  2. 2. The preparation method according to claim 1, wherein the rotational speed of the mixing is 50-2000 r/min; The temperature of the heating is 25-60 ℃; the remixing time is 30-60 min; the speed of the remixing is 500-1500 r/min; And sintering the ceramic fiber filter tube yellow tube with the composite waterproof agent on the surface to obtain the ceramic fiber filter tube product.
  3. 3. The method according to claim 1, wherein the spray-coating further comprises a low-temperature drying step; The temperature of the low-temperature drying is 20-50 ℃; the catalyst slurry comprises a catalyst carrier liquid and water; The catalyst carrier liquid is vanadium-titanium catalyst liquid; The mass ratio of the catalyst carrier liquid to the water is 1 (3-5).
  4. 4. The method of claim 1, wherein the composite waterproof agent is compounded on the outer surface of the ceramic fiber filter tube; the ceramic fiber filter tube comprises a denitration ceramic fiber filter tube.
  5. 5. The method of claim 4, wherein the ceramic fiber filter tube comprises a column head, a column shaft and a flange; the outer surface includes one or more of a column head outer surface, a column shaft outer surface, and a flange outer surface.
  6. 6. The preparation method of claim 1, wherein the composite waterproof agent comprises the following raw materials in parts by mass: 70-99 parts of water; 1-30 parts by weight of a water repellent and/or a water repellent; 0.05-0.1 parts by weight of an inorganic binder; 0.02-0.05 parts by weight of a silane coupling agent; 0.01-0.02 parts by weight of a defoaming agent; 1-5 parts of organic solvent.
  7. 7. The method of claim 6, wherein the hydrophobic agent or agent comprises one or more of fatty acid metal soaps, waxes, polyolefins, silicone resins, and fluorocarbon polymers; the inorganic binder comprises an aluminum sol and/or a silica sol; the silane coupling agent comprises one or more of vinyl triethoxysilane, vinyl trimethoxysilane, vinyl tri (beta-methoxyethoxy) silane and gamma-methacryloxypropyl trimethoxysilane; the defoaming agent comprises one or more of polyether defoaming agents, polyester modified silicon defoaming agents and phosphate defoaming agents; the organic solvent comprises one or more of absolute ethyl alcohol, glycerol and n-butyl alcohol.
  8. 8. The preparation method of claim 1, wherein the dry basis mass of the composite waterproof agent accounts for 2% -4% of the mass content of the ceramic fiber filter tube; the coating thickness of the composite waterproof agent is 0.01-2 mm; the ceramic fiber filter tube comprises a denitration and dust removal integrated ceramic fiber filter tube.
  9. 9. The method according to claim 4, wherein the denitration ceramic fiber filter tube comprises a ceramic fiber filter tube in which a denitration catalyst is compounded; the denitration catalyst comprises a vanadium-titanium denitration catalyst; The mass of the denitration catalyst accounts for 0.01% -10% of the mass of the ceramic fiber filter tube.
  10. 10. The preparation method according to claim 1, wherein the fiber length of the ceramic fiber filter tube is 2-3 μm; the length of the ceramic fiber filter tube is 2.5-3.5 m; The pipe diameter of the ceramic fiber filter pipe is 10-25 cm; the porosity of the ceramic fiber filter tube is 65% -85%; The pressure drop of the ceramic fiber filter tube is 650-1100 Pa; The compressive strength of the C ring of the ceramic fiber filter tube is more than or equal to 0.35 megapascals.

Description

Denitration and dust removal integrated ceramic fiber filter tube subjected to pretreatment of composite nano hydrophobic agent and preparation method thereof Technical Field The invention belongs to the technical field of surface treatment of denitration and dust removal integrated ceramic fiber filter tubes, relates to application of a waterproof agent on a ceramic fiber filter tube and a preparation method of the ceramic fiber filter tube containing a composite waterproof agent, and in particular relates to a denitration and dust removal integrated ceramic fiber filter tube subjected to pretreatment of a composite nano hydrophobic agent and a preparation method of the ceramic fiber filter tube. Background In recent years, along with the increasingly strict national environmental protection requirements, the flue gas dust removal and denitration integrated process becomes a research and development hot spot for domestic flue gas treatment. The ceramic fiber has good high temperature resistance, saves the cooling cost and creates the benefit of heat energy recovery in the high temperature filtering process, has stable operation, saves a great amount of manpower maintenance and operation cost, has high denitration efficiency, can control the dust emission to be below 10mg/m 3, has the nitrogen oxide removal rate of more than 95 percent at 200-450 ℃, has firm ceramic fiber tube, resists the temperature and does not burn, avoids the danger of cloth bag damage and accidental burning, has corrosion resistance and wear resistance, is not easy to poison a catalyst, has the service life of more than eight years, and can be washed and regenerated in recycling. Meets the national ultra-clean emission requirements, and has important economic, environmental and social benefits for the field of flue gas treatment. However, at present, in the process that most domestic ceramic fiber filter tube (yellow tube) manufacturers adopt catalyst liquid to coat ceramic fiber filter tubes (white tubes), the catalyst liquid usually overflows or permeates to the surface, so that the produced ceramic fiber filter tube with integrated denitration and dust removal has serious pollution and affects the appearance. Therefore, how to find a more suitable way, solve the technical problems existing in the existing production process, not only can keep the denitration performance stable in the process of coating the white pipe with the catalyst liquid, but also can ensure attractive and clean appearance and regular coloring, and is a technical problem to be solved urgently in the current domestic denitration dust removal filter pipe processing field. Disclosure of Invention In view of the above, the technical problem to be solved by the invention is to provide an application of a waterproof agent on a ceramic fiber filter tube and a preparation method of the ceramic fiber filter tube containing a composite waterproof agent, in particular to a denitration and dust removal integrated ceramic fiber filter tube subjected to pretreatment of a composite nano hydrophobic agent. The invention adopts the composite nano hydrophobic agent to firstly carry out hydrophobic treatment on the outer surface of the white pipe or the flange and the column head, and then uses the catalyst liquid to coat, thus preparing the yellow pipe product, which has the advantages of stable denitration performance, clean and beautiful appearance, high concentration of the catalyst liquid, less water (deionized water), short yellow pipe drying time, simple preparation method, easy control of production, energy conservation, consumption reduction and the like, and is easier for industrialized popularization and application. The invention provides an application of a waterproof agent on a ceramic fiber filter tube; The waterproof agent is compounded on the outer surface of the ceramic fiber filter tube. Preferably, the ceramic fiber filter tube comprises a denitration ceramic fiber filter tube; the ceramic fiber filter tube comprises a column head, a column shaft and a flange; the outer surface comprises one or more of a column head outer surface, a column shaft outer surface and a flange outer surface; The waterproofing agent comprises a composite waterproofing agent. Preferably, the composite waterproof agent comprises the following raw materials in parts by weight: 70-99 parts of water; 1-30 parts by weight of a water repellent and/or a water repellent; 0.05-0.1 parts by weight of an inorganic binder; 0.02-0.05 parts by weight of a silane coupling agent; 0.01-0.02 parts by weight of a defoaming agent; 1-5 parts of organic solvent. Preferably, the composite waterproof agent comprises a composite hydrophobic agent and/or a composite hydrophobic agent; the hydrophobing agent or water repellent comprises one or more of fatty acid metal soap, paraffin, polyolefin, organic silicon resin and fluorocarbon polymer; the inorganic binder comprises an aluminum sol and/or a silica sol;