CN110052164B - Ceramic catalytic filter tube - Google Patents
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- CN110052164B CN110052164B CN201910435373.4A CN201910435373A CN110052164B CN 110052164 B CN110052164 B CN 110052164B CN 201910435373 A CN201910435373 A CN 201910435373A CN 110052164 B CN110052164 B CN 110052164B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
- B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
- B01D46/71—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with pressurised gas, e.g. pulsed air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/32—Manganese, technetium or rhenium
- B01J23/34—Manganese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
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Abstract
The invention provides a ceramic catalytic filter tube which is characterized by comprising a ceramic catalytic support body and a catalytic body ceramic membrane wrapped on the outer surface of the ceramic catalytic support body, wherein air holes with the aperture of 5-30 micrometers are distributed on the surface of the catalytic body ceramic membrane, tapered holes with the aperture of 0.5-1 mm are transversely and uniformly distributed in the ceramic catalytic filter tube, and the aperture of one end, close to the catalytic body ceramic membrane, of each tapered hole is smaller. The ceramic catalytic filter pipe provided by the invention has the advantages of stable denitration efficiency, wide denitration temperature range, high mechanical strength, strong wear resistance, good filtering effect, capability of simultaneously carrying out denitration and filtration and extremely high efficiency.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a ceramic catalytic filter tube.
Background
In industrial production, waste gas is inevitably generated, and the waste gas is discharged into the air without being treated, which will bring influence to the environment. Among them, the most harmful are gaseous waste gases which are the most various in industrial waste gases. At present, the gaseous waste gas mainly comprises nitrogen-containing organic waste gas, sulfur-containing waste gas and hydrocarbon organic waste gas.
(1) A nitrogen-containing waste gas. Such exhaust gas causes damage to the air components, changing the gas composition ratio. In particular, combustion of petroleum products is a huge amount of combustion of petroleum products in industrial production, and the content of nitrides in the petroleum products is large, so that exhaust gas contains a large amount of nitrogen oxides, and if the exhaust gas is discharged into the air, the content of nitrogen oxides in the air is increased, thereby affecting the atmospheric circulation.
(2) Sulfur containing waste gas. Sulfur-containing exhaust gases pose a direct hazard to the living environment of people, as they combine with water in the air to form acidic species that cause acid rain. Acid rain can cause damage to plants, buildings and human health, and particularly can affect the respiratory tract of people. In addition, the method can also affect soil and water sources and cause secondary pollution.
Therefore, China needs to continuously increase and adopt corresponding measures to solve the problem of air pollution, develop advanced air pollution treatment technology, issue a pollution discharge license system, and relieve the problem of air pollution by the support of financial funds. At present, most of desulfurization, denitration and dust removal technologies in flue gas are in research and industrial demonstration stages, and most of the existing denitration and dust removal devices are complex in structure, large in occupied area and low in denitration and dust removal efficiency.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a ceramic catalytic filter tube.
The technical scheme adopted by the invention is as follows: a ceramic catalytic filter tube comprises a ceramic catalytic support body and a catalyst ceramic membrane wrapped on the outer surface of the ceramic catalytic support body, wherein air holes are distributed in the catalyst ceramic membrane, conical denitration catalytic holes are uniformly distributed in the ceramic catalytic filter tube, one end of each conical denitration catalytic hole is positioned on the inner side of the ceramic catalytic support body, the other end of each conical denitration catalytic hole is tightly attached to the catalyst ceramic membrane, and the aperture of the end, close to the catalyst ceramic membrane, of each conical denitration catalytic hole is smaller;
the ceramic catalytic filter tube is obtained by the following production steps:
1) and (3) pug mixing, namely putting the attapulgite into 6-7 mol/L HCl solution, stirring for 8 hours at 80 ℃, washing with water, drying, and grinding to 400 meshes. 20-30 parts of modified attapulgite, 20-30 parts of anatase titanium dioxide, 2-3 parts of gamma-alumina, 3-5 parts of silicon dioxide and 1.0-1.5 parts of tungsten trioxide are uniformly dry-mixed, 2-3 parts of cerium nitrate, 2-3 parts of ammonium metavanadate and 3-6 parts of a 50% manganese nitrate solution in volume ratio are added, deionized water is prepared into slurry, the prepared ammonium metavanadate solution and the prepared cerium nitrate solution are added into the slurry and stirred uniformly, and the slurry is subjected to reduced pressure evaporation by using a rotary evaporator to remove water. Calcining the completely dried material at a high temperature of 500 ℃, activating the activity, and grinding the material to 400 meshes to obtain catalyst powder; mixing 50-80 parts of catalyst powder, 2-3 parts of calcium oxide, 2-3 parts of magnesium oxide, 0.2-0.3 part of polycarboxylic acid water reducing agent, 3-7 parts of carboxymethyl cellulose, 2-3 parts of stearic acid and 1-2 parts of polyoxyethylene, placing the mixture in a stirrer, adding water and a small amount of 5% ammonia water, and stirring for a period of time to prepare plastic pug;
2) and (3) staling: putting the pug after mixing and kneading into a vacuum pug mill for primary refining, controlling the primary refining vacuum degree to be within the range of 0.08-0.1 Mpa, preparing compact pug bricks, and aging for 24-36 hours at ambient temperature;
3) molding and extruding: extruding the aged pug into a sheet blank by using a hydraulic extruder, and controlling the extrusion pressure to be 5-7 MPa to obtain a molded wet catalyst;
4) preparing a ceramic catalytic support: placing the blank on a PVC flat plate, flattening to form a leather material, pressing a needle plate in the shape shown in figure 2 on the leather material, penetrating the leather material through a needle with the diameter of 0.5-1 mm on the needle plate to form a conical denitration catalytic hole, removing the needle plate, brushing polyurethane resin on the leather material, enabling the polyurethane resin to fill the conical denitration catalytic hole, drying, solidifying and protecting the polyurethane resin in the conical denitration catalytic hole, cutting the leather material, covering the cut leather material on a U-shaped die, finishing the leather material, continuously brushing the polyurethane resin, shaping the leather material into a U-shaped ceramic catalyst blank through ceramic manufacturing means such as kneading, patching, trimming and the like, drying the molded wet catalyst at 100-120 ℃, and cutting the dried catalyst by a cutting machine to obtain a semi-finished ceramic catalytic support body with the required length;
5) preparing a catalyst ceramic membrane: taking 40-50 parts of alumina with the average particle size of 10-20 micrometers, 40-50 parts of kaolin, 1-2 parts of polydimethylsiloxane, 1-2 parts of ammonium dihydrogen phosphate, 1-2 parts of fly ash, 1-2 parts of carboxymethyl cellulose, 1-2 parts of ammonium bicarbonate, 5-10 parts of silica sol and 3-10 parts of titanate coupling agent, uniformly mixing and stirring, then taking the mixture, mixing the mixture with an oxalic acid aqueous solution with the volume ratio of 1.5-2.5% at the temperature of 70-95 ℃, heating the slurry to 80 ℃, stirring for 1-2 hours by ultrasonic vibration to prepare a mixed slurry, brushing the catalytic ceramic membrane slurry on a ceramic catalytic support blank, putting the blank into a shuttle kiln for sintering, burning off polyurethane resin in conical catalytic pores during the sintering process, controlling the sintering temperature to 680-750 ℃, and sintering for about 5 hours, and finally obtaining the ceramic catalytic filter tube after cleaning.
Preferably, the pore diameter of the air holes is 5-30 microns.
Preferably, the aperture of the conical denitration catalytic hole is 0.5-1 mm.
Preferably, the cleaning process employs a high pressure air purge.
The invention has the beneficial effects that: the denitration device has the advantages of stable denitration efficiency, wide denitration temperature range, high mechanical strength, strong wear resistance, good filtering effect, capability of filtering while denitration, and extremely high efficiency.
Drawings
FIG. 1 is a schematic view of a ceramic catalyzed filter tube construction;
fig. 2 is a schematic view of the structure of the needle board.
Detailed Description
The following examples are provided to further illustrate the embodiments of the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the ceramic catalytic filter tube comprises a ceramic catalytic support body 3 and a catalyst ceramic membrane 1 wrapped on the outer surface of the ceramic catalytic support body 3, wherein air holes 4 with the aperture of 5-30 microns are distributed on the catalyst ceramic membrane 1, conical denitration catalytic holes 2 with the aperture of 0.5-1 mm are uniformly distributed in the ceramic catalytic filter tube, one end of each conical denitration catalytic hole 2 is positioned on the inner side of the ceramic catalytic support body 3, the other end of each conical denitration catalytic hole 2 is tightly attached to the catalyst ceramic membrane 1, and the aperture of one end of each conical denitration catalytic hole 2 tightly attached to the catalyst ceramic membrane 1 is smaller;
the ceramic catalytic filter tube was prepared by the following example:
example 1:
1) and (3) pug mixing, namely putting the attapulgite into 7mol/L HCl solution, stirring for 8 hours at 80 ℃, washing with water, drying, and grinding to 400 meshes. The modified attapulgite clay is prepared by dry-mixing 22 parts of modified attapulgite clay, 28 parts of anatase titanium dioxide, 2 parts of gamma-alumina, 4 parts of silicon dioxide and 1 part of tungsten trioxide uniformly, adding 2 parts of cerium nitrate, 2 parts of ammonium metavanadate, 3 parts of a 50% manganese nitrate solution by volume ratio and deionized water to prepare slurry, adding the prepared ammonium metavanadate solution and the prepared cerium nitrate solution into the slurry, stirring uniformly, and evaporating the slurry by using a rotary evaporator under reduced pressure to remove water. Calcining the completely dried material at a high temperature of 500 ℃, activating the activity, and grinding the material to 400 meshes to obtain catalyst powder; mixing 50 parts of catalyst powder, 2 parts of calcium oxide, 2 parts of magnesium oxide, 0.2 part of polycarboxylic acid water reducing agent, 3 parts of carboxymethyl cellulose, 2 parts of stearic acid and 1 part of polyoxyethylene, putting the mixture into a stirrer, adding water and a small amount of 5% ammonia water, and stirring for a period of time to prepare plastic pug;
2) and (3) staling: putting the pug after mixing and kneading into a vacuum pug mill for primary refining, controlling the primary refining vacuum degree within the range of 0.08-0.1 Mpa to prepare compact pug bricks, and aging for 24 hours at ambient temperature;
3) molding and extruding: extruding the aged pug into a sheet blank by using a hydraulic extruder, and controlling the extrusion pressure to be 5MPa to obtain a molded wet catalyst;
4) preparing a ceramic catalytic support: placing the blank on a PVC flat plate, flattening to form a leather material, pressing a needle plate in the shape shown in figure 2 on the leather material, penetrating the leather material through a needle with the diameter of 0.5-1 mm on the needle plate to form a conical denitration catalytic hole, removing the needle plate, brushing polyurethane resin on the leather material, enabling the polyurethane resin to fill the conical denitration catalytic hole, drying, solidifying and protecting the polyurethane resin in the conical denitration catalytic hole, cutting the leather material, covering the cut leather material on a U-shaped die, finishing the leather material, continuously brushing the polyurethane resin, shaping the leather material into an end-closed ceramic catalyst blank through ceramic manufacturing means such as kneading, patching, trimming and the like, drying the molded wet catalyst at 100-120 ℃, and cutting the dried catalyst by a cutting machine to obtain a semi-finished ceramic catalytic support body with the required length;
5) preparing a catalyst ceramic membrane: taking 40 parts of alumina with the average particle size of 10-20 micrometers, 40 parts of kaolin, 1 part of polydimethylsiloxane, 1 part of ammonium dihydrogen phosphate, 1 part of fly ash, 1 part of carboxymethyl cellulose, 1 part of ammonium bicarbonate, 5 parts of silica sol and 3 parts of titanate coupling agent, mixing and stirring uniformly, then taking the mixture to mix with oxalic acid aqueous solution with the volume ratio of 1.5% at the temperature of 70-95 ℃, heating the slurry to 80 ℃, stirring for 1-2 hours by ultrasonic vibration to prepare mixed slurry, brushing the ceramic membrane slurry of the catalyst on a blank of a ceramic catalytic support body, putting the blank into a shuttle kiln for sintering, burning off polyurethane resin in conical denitration catalytic holes in the process of sintering, controlling the sintering temperature to 680-750 ℃, sintering time to about 5 hours, detecting to form air vents with the aperture of 5-30 micrometers, and cleaning to finally obtain the ceramic catalytic filter tube.
Example 2:
1) and (3) pug mixing, namely putting the attapulgite into 6mol/L HCl solution, stirring for 8 hours at 80 ℃, washing with water, drying, and grinding to 400 meshes. Uniformly mixing 30 parts of modified attapulgite, 30 parts of anatase titanium dioxide, 3 parts of gamma-alumina, 5 parts of silicon dioxide and 1.5 parts of tungsten trioxide, adding 3 parts of cerium nitrate, 3 parts of ammonium metavanadate, 6 parts of a 50% manganese nitrate solution in volume ratio and deionized water to prepare slurry, adding the prepared ammonium metavanadate solution and the prepared cerium nitrate solution into the slurry, uniformly stirring, and performing reduced pressure evaporation on the slurry by using a rotary evaporator to remove water. Calcining the completely dried material at a high temperature of 500 ℃, activating the activity, and grinding the material to 400 meshes to obtain catalyst powder; mixing 80 parts of catalyst powder, 3 parts of calcium oxide, 3 parts of magnesium oxide, 0.3 part of polycarboxylic acid water reducing agent, 7 parts of carboxymethyl cellulose, 3 parts of stearic acid and 2 parts of polyoxyethylene, putting the mixture into a stirrer, adding water and a small amount of 5% ammonia water, and stirring for a period of time to prepare plastic pug;
2) and (3) staling: putting the pug after mixing and kneading into a vacuum pug mill for primary refining, controlling the primary refining vacuum degree within the range of 0.08-0.1 Mpa to prepare compact pug bricks, and aging for 36 hours at ambient temperature;
3) molding and extruding: extruding the aged pug into a sheet blank by using a hydraulic extruder, and controlling the extrusion pressure to be 7MPa to obtain a molded wet catalyst;
4) preparing a ceramic catalytic support: placing the blank on a PVC flat plate, flattening to form a leather material, pressing a needle plate in the shape shown in figure 2 on the leather material, penetrating the leather material through a needle with the diameter of 0.5-1 mm on the needle plate to form a conical denitration catalytic hole, removing the needle plate, brushing polyurethane resin on the leather material, enabling the polyurethane resin to fill the conical denitration catalytic hole, drying, solidifying and protecting the polyurethane resin in the conical denitration catalytic hole, cutting the leather material, covering the cut leather material on a U-shaped die, finishing the leather material, continuously brushing the polyurethane resin, shaping the leather material into an end-closed ceramic catalyst blank through ceramic manufacturing means such as kneading, patching, trimming and the like, drying the molded wet catalyst at 100-120 ℃, and cutting the dried catalyst by a cutting machine to obtain a semi-finished ceramic catalytic support body with the required length;
5) preparing a catalyst ceramic membrane: taking 50 parts of alumina with the average particle size of 10-20 micrometers, 50 parts of kaolin, 2 parts of polydimethylsiloxane, 2 parts of ammonium dihydrogen phosphate, 2 parts of fly ash, 2 parts of carboxymethyl cellulose, 2 parts of ammonium bicarbonate, 10 parts of silica sol and 10 parts of titanate coupling agent, mixing and stirring uniformly, then taking the mixture to mix with oxalic acid aqueous solution with the volume ratio of 2.5% at the temperature of 70-95 ℃, heating the slurry to 80 ℃, stirring for 1-2 hours by ultrasonic vibration to prepare mixed slurry, brushing the ceramic membrane slurry of the catalyst on a blank of a ceramic catalytic support body, putting the blank into a shuttle kiln for sintering, burning off polyurethane resin in conical denitration catalytic holes in the process of sintering, controlling the sintering temperature to 680-750 ℃, sintering time to about 5 hours, detecting to form air vents with the aperture of 5-30 micrometers, and cleaning to finally obtain the ceramic catalytic filter tube.
Example 3:
1) and (3) pug mixing, namely putting the attapulgite into 6mol/L HCl solution, stirring for 8 hours at 80 ℃, washing with water, drying, and grinding to 400 meshes. The preparation method comprises the following steps of dry-mixing 25 parts of modified attapulgite, 25 parts of anatase titanium dioxide, 2 parts of gamma-alumina, 4 parts of silicon dioxide and 1.5 parts of tungsten trioxide uniformly, adding 2 parts of cerium nitrate, 3 parts of ammonium metavanadate, 5 parts of a 50% manganese nitrate solution in volume ratio and deionized water to prepare slurry, adding the prepared ammonium metavanadate solution and the prepared cerium nitrate solution into the slurry, stirring uniformly, and evaporating the slurry under reduced pressure by using a rotary evaporator to remove water. Calcining the completely dried material at a high temperature of 500 ℃, activating the activity, and grinding the material to 400 meshes to obtain catalyst powder; mixing 65 parts of catalyst powder, 3 parts of calcium oxide, 2 parts of magnesium oxide, 0.2 part of polycarboxylic acid water reducing agent, 5 parts of carboxymethyl cellulose, 2 parts of stearic acid and 2 parts of polyoxyethylene, putting the mixture into a stirrer, adding water and a small amount of 5% ammonia water, and stirring for a period of time to prepare plastic pug;
2) and (3) staling: putting the pug after mixing and kneading into a vacuum pug mill for primary refining, controlling the primary refining vacuum degree to be within the range of 0.08-0.1 Mpa, preparing compact pug bricks, and aging for 30 hours at ambient temperature;
3) molding and extruding: extruding the aged pug into a sheet blank by using a hydraulic extruder, and controlling the extrusion pressure to be 6MPa to obtain a molded wet catalyst;
4) preparing a ceramic catalytic support: placing the blank on a PVC flat plate, flattening to form a leather material, pressing a needle plate in the shape shown in figure 2 on the leather material, penetrating the leather material through a needle with the diameter of 0.5-1 mm on the needle plate to form a conical denitration catalytic hole, removing the needle plate, brushing polyurethane resin on the leather material, enabling the polyurethane resin to fill the conical denitration catalytic hole, drying, solidifying and protecting the polyurethane resin in the conical denitration catalytic hole, cutting the leather material, covering the cut leather material on a U-shaped die, finishing the leather material, continuously brushing the polyurethane resin, shaping the leather material into an end-closed ceramic catalyst blank through ceramic manufacturing means such as kneading, patching, trimming and the like, drying the molded wet catalyst at 100-120 ℃, and cutting the dried catalyst by a cutting machine to obtain a semi-finished ceramic catalytic support body with the required length;
5) preparing a catalyst ceramic membrane: taking 45 parts of alumina with the average particle size of 15 microns, 45 parts of kaolin, 1 part of polydimethylsiloxane, 2 parts of ammonium dihydrogen phosphate, 2 parts of fly ash, 1 part of carboxymethyl cellulose, 1 part of ammonium bicarbonate, 8 parts of silica sol and 7 parts of titanate coupling agent, mixing and stirring uniformly, then taking the mixture to mix with oxalic acid aqueous solution with the volume ratio of 2% at the temperature of 70-95 ℃, the slurry ratio is 1:3, heating to 80 ℃, stirring for 1-2 hours by ultrasonic oscillation to prepare mixed slurry, brushing the ceramic membrane slurry of the catalyst on the blank of the ceramic catalytic support body, putting the blank into a shuttle kiln to be fired, during the calcination process, burning off polyurethane resin in the conical denitration catalytic pores, controlling the burning temperature at 680-750 ℃, keeping the burning time for about 5 hours, forming pores in ammonium dihydrogen phosphate and fly ash at high temperature, detecting to form air holes with the pore diameter of 5-30 microns, and cleaning to finally obtain the ceramic catalytic filter tube.
The detection indexes of the ceramic catalytic filter tube in each embodiment are as follows:
in specific implementation, the treated flue gas is filtered through the air holes 4 on the surface of the catalytic body ceramic membrane 1 and then enters the ceramic catalytic filter tube, and the nitrogen oxides are removed under the action of the ceramic catalytic support body 3. However, the concentration of the flue gas dust entering the denitration dust remover 3 is still high, and the dust deposition is preferably cleaned.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A ceramic catalytic filter tube is characterized by comprising a ceramic catalytic support body and a catalyst ceramic membrane wrapped on the outer surface of the ceramic catalytic support body, wherein air holes are distributed in the catalyst ceramic membrane, conical denitration catalytic holes are uniformly distributed in the ceramic catalytic filter tube, one end of each conical denitration catalytic hole is positioned on the inner side of the ceramic catalytic support body, the other end of each conical denitration catalytic hole is tightly attached to the catalyst ceramic membrane, and the aperture of one end, close to the catalyst ceramic membrane, of each conical denitration catalytic hole is smaller;
the ceramic catalytic filter tube is obtained by the following production steps:
1) pug mixing, namely putting attapulgite in 6-7 mol/L HCl solution, stirring for 8 hours at 80 ℃, washing with water, drying, and grinding to 400 meshes;
20-30 parts of modified attapulgite, 20-30 parts of anatase titanium dioxide, 2-3 parts of gamma-alumina, 3-5 parts of silicon dioxide and 1.0-1.5 parts of tungsten trioxide are uniformly dry-mixed, 2-3 parts of cerium nitrate, 2-3 parts of ammonium metavanadate and 3-6 parts of a 50% manganese nitrate solution in volume ratio are added, deionized water is prepared into slurry, the prepared ammonium metavanadate solution and the prepared cerium nitrate solution are added into the slurry and stirred uniformly, and the slurry is subjected to reduced pressure evaporation by using a rotary evaporator to remove water;
calcining the completely dried material at a high temperature of 500 ℃, activating the activity, and grinding the material to 400 meshes to obtain catalyst powder; mixing 50-80 parts of catalyst powder, 2-3 parts of calcium oxide, 2-3 parts of magnesium oxide, 0.2-0.3 part of polycarboxylic acid water reducing agent, 3-7 parts of carboxymethyl cellulose, 2-3 parts of stearic acid and 1-2 parts of polyoxyethylene, placing the mixture in a stirrer, adding water and a small amount of 5% ammonia water, and stirring for a period of time to prepare plastic pug;
2) and (3) staling: putting the pug after mixing and kneading into a vacuum pug mill for primary refining, controlling the primary refining vacuum degree to be within the range of 0.08-0.1 Mpa, preparing compact pug bricks, and aging for 24-36 hours at ambient temperature;
3) molding and extruding: extruding the aged pug into a sheet blank by using a hydraulic extruder, and controlling the extrusion pressure to be 5-7 MPa to obtain a molded wet catalyst;
4) preparing a ceramic catalytic support: placing the blank on a PVC flat plate, flattening to form a leather material, pressing a needle plate on the leather material, penetrating the leather material through a needle with the diameter of 0.5-1 mm on the needle plate to form a conical denitration catalytic hole, removing the needle plate, brushing polyurethane resin on the leather material, drying the polyurethane resin after the conical denitration catalytic hole is filled with the polyurethane resin, solidifying and shape-maintaining the polyurethane resin in the conical denitration catalytic hole, cutting the leather material, covering the leather material on a U-shaped die, finishing the leather material, continuously brushing the polyurethane resin, shaping the leather material into a U-shaped ceramic catalyst blank through ceramic manufacturing means including kneading, patching and trimming, drying the molded wet catalyst at 100-120 ℃, cutting the dried catalyst by using a cutting machine, and obtaining a semi-finished ceramic catalytic support body with the required length;
5) preparing a catalyst ceramic membrane: taking 40-50 parts of alumina with the average particle size of 10-20 micrometers, 40-50 parts of kaolin, 1-2 parts of polydimethylsiloxane, 1-2 parts of ammonium dihydrogen phosphate, 1-2 parts of fly ash, 1-2 parts of carboxymethyl cellulose, 1-2 parts of ammonium bicarbonate, 5-10 parts of silica sol and 3-10 parts of titanate coupling agent, uniformly mixing and stirring, then taking the mixture, mixing the mixture with an oxalic acid aqueous solution with the volume ratio of 1.5-2.5% at 70-95 ℃, heating the slurry to 80 ℃, stirring for 1-2 hours by ultrasonic vibration to prepare a mixed slurry, brushing the catalytic ceramic membrane slurry on a ceramic catalytic support blank, putting the blank into a shuttle kiln for sintering, burning off polyurethane resin in conical catalytic pores during the sintering process, controlling the sintering temperature at 680-750 ℃, and sintering for 5 hours, and finally obtaining the ceramic catalytic filter tube after cleaning.
2. The ceramic catalytic filter tube of claim 1, wherein the pores of the gas permeable pores have a diameter of 5 to 30 μm.
3. The ceramic catalytic filter tube of claim 1, wherein the diameter of the conical denitration catalytic hole is 0.5-1 mm.
4. The ceramic catalytic filter tube of claim 1, wherein the cleaning process uses a high pressure air purge.
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| CN112958127B (en) * | 2021-02-26 | 2023-03-31 | 上海大学材料基因组工程(萍乡)研究院 | Method for loading catalyst on ceramic fiber |
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| CN102475998A (en) * | 2010-11-29 | 2012-05-30 | 宁波杜康陶瓷有限公司 | Carbon crystal composite gradient ceramic cartridge for water filtration |
| CN103157328A (en) * | 2013-03-07 | 2013-06-19 | 湖南长重机器股份有限公司 | PM 2.5 micropore ceramic filtering element and preparation technology |
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