CN110201541B - Method and device for loading catalyst on ceramic fiber filter element - Google Patents
Method and device for loading catalyst on ceramic fiber filter element Download PDFInfo
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- CN110201541B CN110201541B CN201910623412.3A CN201910623412A CN110201541B CN 110201541 B CN110201541 B CN 110201541B CN 201910623412 A CN201910623412 A CN 201910623412A CN 110201541 B CN110201541 B CN 110201541B
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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
- B01D53/8628—Processes characterised by a specific catalyst
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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
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
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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
- B01D53/88—Handling or mounting catalysts
- B01D53/885—Devices in general for catalytic purification of waste gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
Abstract
The invention provides a method and a device for loading a catalyst on a ceramic fiber filter element, belonging to the technical field of catalyst loading. The method comprises the following steps: inserting a catalyst spray rod into the ceramic fiber filter element; a liquid outlet hole is formed in the catalyst spray rod; and under the negative pressure condition, spraying the dispersion liquid of the catalyst to the inner wall of the ceramic fiber filter element by using the catalyst spray rod, and diffusing the catalyst along the wall thickness direction of the ceramic fiber filter element to load the catalyst on the ceramic fiber filter element. The method and the device provided by the invention can ensure that the catalyst is uniformly loaded, the air permeability of the filter element is good, the dosage of the catalyst can be accurately controlled, and unnecessary waste is avoided.
Description
Technical Field
The invention relates to the technical field of catalyst loading, in particular to a method and a device for loading a catalyst on a ceramic fiber filter element.
Background
Along with the society development is faster and faster, air pollution has become a great harm which puzzles people's life, and the waste gas that produces in the industrial production contains a plurality of components harmful to the human body, and the catalyst decomposes harmful gas and usually needs higher temperature (220 ~ 450 ℃), and conventional technique is to load the catalyst on honeycomb rigid ceramic, and this kind of mode has more defects: the contact time of the waste gas and the catalyst is short, the reaction efficiency is low, the dust is easy to cover the contact surface, and the honeycomb holes of the catalyst are easy to block. The catalyst is loaded on the high-temperature ceramic fiber filter element, so that the defects can be completely avoided. The main body is as follows: 1. the high-temperature ceramic fiber filter element has high temperature resistance (less than or equal to 1000 ℃) and can load catalysts at various temperature points; 2. the high-temperature ceramic fiber filter core has high porosity (more than 80 percent) and can treat a large amount of flue gas; 3. the high-temperature ceramic fiber filter element has a compact structure, dust can be blocked on the outer surface of the filter element, and waste gas can enter the filter element to perform high-efficiency reaction.
The existing catalyst loading technology is generally impregnation, namely, the catalyst is loaded on a filter element by using a soaking method, and the method has many defects, such as uneven catalyst loading, more catalyst accumulated at the part of a downward gravity section of the filter element, reduced air permeability of the filter element, more catalyst needed to be used under the same efficacy and the like.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for loading a catalyst on a ceramic fiber filter element, wherein the method provided by the present invention can ensure uniform catalyst loading and good filter element air permeability, and can accurately control the amount of the catalyst, thereby avoiding unnecessary waste.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for loading a catalyst on a ceramic fiber filter element, which comprises the following steps:
inserting a catalyst spray rod into the ceramic fiber filter element; a liquid outlet hole is formed in the catalyst spray rod;
and under the negative pressure condition, spraying the dispersion liquid of the catalyst to the inner wall of the ceramic fiber filter element by using the catalyst spray rod, and diffusing the catalyst along the wall thickness direction of the ceramic fiber filter element to load the catalyst on the ceramic fiber filter element.
Preferably, after the spraying is finished, the negative pressure condition is kept for 4-6 min.
Preferably, after the catalyst is loaded on the ceramic fiber filter element, the method further comprises drying the loaded material.
Preferably, the liquid outlet hole is formed by laser drilling of high-resilience rubber.
Preferably, the dispersion of the catalyst is obtained by mixing the catalyst with water.
Preferably, the negative pressure is-500 Pa to-1000 Pa.
The invention provides a device for loading a catalyst on a ceramic fiber filter element, which comprises an injection device 1, a negative pressure bin 2 and a vacuum pump 3; the spraying device comprises a liquid storage tank 4, a catalyst spray rod 5 and a high-pressure pump 6; the liquid storage tank 4 is communicated with a catalyst spray rod 5, the high-pressure pump 6 is connected with the catalyst spray rod 5, and the vacuum pump 3 is connected with the negative pressure bin 2; and a liquid outlet hole is formed in the catalyst spray rod 5.
Preferably, a stirring device 7 is further arranged in the liquid storage tank 4.
Preferably, a slide rail 8 is provided at the bottom of the spraying device 1.
Preferably, an electrical control system is arranged on the high-pressure pump 6.
The invention provides a method for loading a catalyst on a ceramic fiber filter element, which comprises the following steps: inserting a catalyst spray rod into the ceramic fiber filter element; a liquid outlet hole is formed in the catalyst spray rod; and under the negative pressure condition, spraying the dispersion liquid of the catalyst to the inner wall of the ceramic fiber filter element by using the catalyst spray rod, and diffusing the catalyst along the wall thickness direction of the ceramic fiber filter element to load the catalyst on the ceramic fiber filter element. The catalyst spray rod is provided with the liquid outlet holes, so that liquid outlet is stable, spraying uniformity is good, a catalyst solution is adsorbed into the wall thickness of the filter element under the negative pressure condition and is uniformly distributed, and meanwhile, the negative pressure can absorb excessive water so that the catalyst is not transferred, and the air permeability is not influenced by the position where a large amount of catalyst is locally accumulated among fibers; moreover, the catalyst spray rod can accurately control the using amount of the catalyst, so that unnecessary waste is avoided; in addition, the catalyst is uniformly distributed in the filter element, but no catalyst is arranged on the surface of the filter element, so that the catalyst poisoning and the use amount of the catalyst are reduced.
The invention provides a device for loading a catalyst on a ceramic fiber filter element, which is simple in structure and easy to operate.
Drawings
FIG. 1 is a schematic structural diagram of a device for loading a catalyst on a ceramic fiber filter element provided by the invention,
the device comprises a spraying device 1, a negative pressure cabin 2, a vacuum pump 3, a liquid storage tank 4, a catalyst spray rod 5, a high-pressure pump 6, a stirring device 7, a slide rail 8, a negative pressure cabin upper cover 9, a negative pressure cabin base 10, a plug 11, a hydraulic lifting rod 12 and a fixed support 13.
Detailed Description
The invention provides a method for loading a catalyst on a ceramic fiber filter element, which comprises the following steps:
inserting a catalyst spray rod into the ceramic fiber filter element; a liquid outlet hole is formed in the catalyst spray rod;
and under the negative pressure condition, spraying the dispersion liquid of the catalyst to the inner wall of the ceramic fiber filter element by using the catalyst spray rod, and diffusing the catalyst along the wall thickness direction of the ceramic fiber filter element to load the catalyst on the ceramic fiber filter element.
The invention inserts the catalyst spray rod into the ceramic fiber filter element.
The invention has no special requirements on the specification of the ceramic fiber filter element, and the ceramic fiber filter element with the specification known by the technicians in the field can be adopted. The invention has no special requirements on the specification of the catalyst spray rod, can be selected and adjusted according to actual requirements, and can be designed by self such as the length and the diameter of the spray rod. In the invention, the catalyst spray rod is provided with a liquid outlet hole for spraying the dispersion liquid of the catalyst. In the invention, the liquid outlet hole is preferably formed by laser drilling of high-resilience rubber, and the requirement of the ejection quantity required by the process can be met by increasing the pressure or flow rate of a high-pressure pump; the invention has no special requirement on the specific type of the high-resilience rubber, and the high-resilience rubber well known in the field can be used, such as ethylene propylene diene monomer rubber, chloroprene rubber and the like. In the invention, the liquid outlet hole is preferably in a closed state under the condition of no pressure, and becomes a circular nozzle with the diameter of 0.7-1.3 mm after being pressed. In the invention, the distance between the adjacent liquid outlet holes is preferably 5-10 mm, and the number, the distance and the specification of the liquid outlet holes can be adjusted by a person skilled in the art according to the actual situation. According to the invention, the catalyst spray rod is provided with the liquid outlet hole, so that stable liquid outlet is facilitated, and the spraying uniformity is good. The invention has no special requirement on the way of inserting the catalyst spray rod into the ceramic fiber filter element, and can realize any way of entering the filter element. The specific position of insertion can be adjusted by the skilled person according to the actual need. When inserted at the very center of the interior of the filter element, the catalyst is distributed most evenly over the ceramic fiber filter element.
After the catalyst spray rod is inserted into the ceramic fiber filter element, the catalyst spray rod is adopted to spray the dispersion liquid of the catalyst to the inner wall of the ceramic fiber filter element under the condition of negative pressure, and the catalyst is diffused along the wall thickness direction of the ceramic fiber filter element and is loaded on the ceramic fiber filter element.
The catalyst of the present invention has no special requirement on the kind of the catalyst, and any powdery catalyst can be used, and specifically, the catalyst can be a noble metal catalyst commonly used for treating VOCS (organic waste gas), a heavy metal catalyst commonly used for denitration, and the like, but is not limited to these catalysts. In the invention, the particle size of the catalyst is preferably 250-350 meshes, and more preferably 300 meshes.
In the present invention, the dispersion of the catalyst is preferably obtained by uniformly mixing the catalyst with water. The invention has no special requirement on the concentration of the catalyst dispersion liquid, as long as the catalyst can be uniformly dispersed.
In the present invention, the negative pressure is preferably-500 Pa to-1000 Pa. Under the negative pressure condition, the dispersion liquid of the catalyst is adsorbed to the side wall of the ceramic fiber filter element and is uniformly distributed, but no catalyst is arranged on the outer surface of the filter element, (because the catalyst is granular, the catalyst is adsorbed to the fibers in the filter element in the loading process, the inner gap and the outer gap of the wall thickness of the filter element have step degrees, the outer gap is small, the inner gap is large, the catalyst particles are blocked by the smaller gap layer of the outer layer in the negative pressure, only water and partial organic binder can permeate through the outermost layer of the filter element and be absorbed by the negative pressure), the catalyst poisoning can be reduced, the using amount of the catalyst can be reduced, meanwhile, the negative pressure can absorb excessive water, the catalyst is prevented from migrating, and a place where more catalyst is locally accumulated among the fibers to influence the air permeability. In the invention, when the outer diameter of the ceramic fiber filter element is 150mm and the wall thickness is 15mm, the migration distance of catalyst particles along the wall thickness direction is 10-12 mm. In addition, the catalyst spray lance is adopted for spraying, so that the spraying amount of the catalyst can be accurately controlled, and unnecessary waste is avoided. The invention has no special requirement on the injection time and can control according to the injection amount. The spraying process of the invention realizes the loading of the catalyst on the ceramic fiber filter element.
After the spraying is stopped, the negative pressure condition is preferably kept for 4-6 min continuously so that the catalyst is fully diffused on the ceramic fiber filter element.
After the catalyst is loaded on the ceramic fiber filter element, the invention preferably further comprises drying the material obtained after the loading.
In the invention, the drying temperature is preferably 120-150 ℃, the drying time has no special requirement, and the ceramic fiber filter element can be dried.
The invention provides a device for loading a catalyst on a ceramic fiber filter element, which comprises an injection device 1, a negative pressure bin 2 and a vacuum pump 3, wherein the injection device 1 is shown in figure 1; the spraying device 1 comprises a liquid storage tank 4, a catalyst spray rod 5 and a high-pressure pump 6; the liquid storage tank 4 is communicated with a catalyst spray rod 5, the high-pressure pump 6 is connected with the catalyst spray rod 5, and the vacuum pump 3 is connected with the negative pressure bin 2; and a liquid outlet hole is formed in the catalyst spray rod 5.
As shown in fig. 1, the device for loading a catalyst on a ceramic fiber filter element provided by the invention comprises a spraying device 1, wherein the spraying device comprises a liquid storage tank 4. In the present invention, the liquid storage tank 4 is used for storing a dispersion of the catalyst.
In one embodiment of the present invention, a stirring device 7 is further disposed in the liquid storage tank 4 for stirring the liquid in the liquid storage tank to uniformly disperse the catalyst.
In the present invention, the injection device 1 comprises a catalyst spray bar 5, and the catalyst spray bar 5 is communicated with a liquid storage tank 4. In the present invention, the catalyst lance 5 is used to spray a dispersion of catalyst.
In the invention, the catalyst spray rod is provided with a liquid outlet hole, and the dispersion liquid of the catalyst is sprayed out through the liquid outlet hole. As an embodiment of the invention, the catalyst spray rod comprises a tubular base material and a rubber ring fixed on the outer surface of the tubular base material, the liquid outlet holes are uniformly distributed on the rubber ring, the tubular base material is provided with large holes with the diameter of 8-15 mm, and the large holes in the tubular base material are communicated with the liquid outlet holes.
In the present invention, the injection device 1 further comprises a high-pressure pump 6, and the high-pressure pump 6 is connected with a catalyst spray bar 5. In the invention, the high-pressure pump 6 is used for applying high pressure to the catalyst spray rod, when the high-pressure pump is started, the liquid outlet hole on the catalyst spray rod is opened to spray the dispersion liquid of the catalyst, and when the high-pressure pump is closed, the liquid outlet hole on the catalyst spray rod is closed to stop spraying.
As an embodiment of the present invention, an electrical control system is provided on the high-pressure pump 6, and the electrical control system is used for controlling the operating time of the high-pressure pump, and thus controlling the injection amount of the catalyst dispersion.
As an embodiment of the present invention, a slide rail 8 is provided at the bottom of the spraying device 1. In the invention, the slide rail 8 is used for realizing the movement of the catalyst spray rod, so that the catalyst spray rod is inserted into a specified position inside the ceramic filter element.
The device for loading the catalyst on the ceramic fiber filter element comprises a negative pressure bin 2, wherein the negative pressure bin 2 is used for containing the ceramic fiber filter element and providing a negative pressure environment for spraying of a catalyst spray rod.
As an embodiment of the present invention, the negative pressure chamber 2 includes a negative pressure chamber base 10, a negative pressure chamber upper cover 9 and a plug 11; and the negative pressure cabin base 10, the negative pressure cabin upper cover 9 and the plug 11 are closed to enable the negative pressure cabin to be in a closed state.
As an embodiment of the invention, a hydraulic lifting rod 12 and a fixed bracket 13 are arranged at the top of the negative pressure cabin, and the fixed bracket 13, the hydraulic lifting rod 12 and the negative pressure cabin upper cover 9 are connected in sequence; the hydraulic lifting rod is used for separating the negative pressure bin base from the negative pressure bin upper cover.
In the invention, the negative pressure cabin 2 is connected with a vacuum pump 3. The vacuum pump 3 is used for vacuumizing the negative pressure cabin 2 to a specified negative pressure. The invention has no special requirements on the specific structure of the negative pressure cabin.
The method and apparatus for loading catalyst on ceramic fiber filter cartridge provided by the present invention will be described in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1
The apparatus used is shown in fig. 1.
Loading a noble metal catalyst on a ceramic fiber filter element with the length of 2000mm, the outer diameter of 150mm and the inner diameter of 120mm, and removing VOCS (volatile organic compounds) organic waste gas;
as the device shown in figure 1, 500 g of metal palladium powder is poured into a liquid storage tank 4, 500 kg of ionized water is added, a stirring device 7 is opened, the stirring is uniform, a catalyst spray rod is of a 2-meter-specification spray rod, liquid outlet holes are distributed on the catalyst spray rod, the liquid outlet holes are pressed to form a circular nozzle with the diameter of about 1mm, and the distance between every two adjacent liquid outlet holes is 5 mm. Opening a negative pressure chamber with the pressure of-500 pa, installing a filter element with the length of 2 meters, closing the negative pressure chamber 2, starting a vacuum pump 3, inserting a catalyst spray rod 5 into the filter element for positioning, finally opening a high-pressure pump 6, stopping after setting the working time for 3 minutes, namely spraying 25 kilograms of catalyst (the 500 kilograms of medicament in a catalyst solution box can load 20 ceramic fiber filter elements with the length of 2 meters), continuously starting the negative pressure vacuum pump 3 for 3 minutes, opening a negative pressure chamber upper cover 9 after absorbing most of moisture in the filter element, taking out the filter element, and putting the filter element into an oven for drying. The catalyst filter element loaded by the scheme hardly reduces the air permeability through testing, and keeps the original strength of the filter element.
According to the embodiment, the method and the device for loading the catalyst on the ceramic fiber filter element can ensure that the catalyst is uniformly loaded, the filter element has high air permeability, the using amount of the catalyst can be accurately controlled, and unnecessary waste is avoided.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A method for loading a catalyst on a ceramic fiber filter element, which is characterized by comprising the following steps:
inserting a catalyst spray rod into the ceramic fiber filter element; a liquid outlet hole is formed in the catalyst spray rod; the liquid outlet holes are distributed over the catalyst spray rod;
under the negative pressure condition, spraying the dispersion liquid of the catalyst to the inner wall of the ceramic fiber filter element by using the catalyst spray rod, and diffusing the catalyst along the wall thickness direction of the ceramic fiber filter element to load the catalyst on the ceramic fiber filter element;
the negative pressure is-500 pa to-1000 pa;
under the negative pressure condition, the dispersion liquid of the catalyst is adsorbed to the side wall of the ceramic fiber filter element and is uniformly distributed, but the catalyst is not arranged on the outer surface of the filter element.
2. The method according to claim 1, wherein the negative pressure condition is maintained for 4-6 min after the completion of the spraying.
3. The method of claim 1, wherein after loading the catalyst on the ceramic fiber filter element, drying the loaded material.
4. The method of claim 1, wherein the exit holes are laser drilled in high resilience rubber.
5. The process according to claim 1, wherein the dispersion of the catalyst is obtained by mixing the catalyst with water.
6. The device for loading the catalyst on the ceramic fiber filter element is characterized by comprising an injection device (1), a negative pressure bin (2) and a vacuum pump (3); the spraying device comprises a liquid storage tank (4), a catalyst spray rod (5) and a high-pressure pump (6); the liquid storage tank (4) is communicated with the catalyst spray rod (5), the high-pressure pump (6) is connected with the catalyst spray rod (5), and the vacuum pump (3) is connected with the negative pressure bin (2); a liquid outlet hole is formed in the catalyst spray rod (5); the negative pressure bin 2 is used for containing a ceramic fiber filter element and providing a negative pressure environment for the spraying of a catalyst spray rod; the catalyst spray lance comprises a tubular base material and a rubber ring fixed on the outer surface of the tubular base material, the liquid outlet holes are uniformly distributed on the rubber ring, a large hole with the diameter of 8-15 mm is formed in the tubular base material, and the large hole in the tubular base material is communicated with the liquid outlet holes.
7. Device according to claim 6, characterized in that a stirring device (7) is also provided in the tank (4).
8. Device according to claim 6, characterized in that a slide rail (8) is provided at the bottom of the spraying device (1).
9. The device according to claim 6, characterized in that said high-pressure pump (6) is provided with an electrical control system.
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