CN111617555A - High-temperature catalytic purification metal fiber filter material and preparation method thereof - Google Patents
High-temperature catalytic purification metal fiber filter material and preparation method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/10—Filter screens essentially made of metal
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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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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/02—Layer formed of wires, e.g. mesh
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/14—Layered products comprising a layer of metal next to a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/18—Layered products comprising a layer of metal comprising iron or steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0407—Additives and treatments of the filtering material comprising particulate additives, e.g. adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/20—All layers being fibrous or filamentary
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/103—Metal fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
Abstract
The invention provides a high-temperature catalytic purification metal fiber filter material and a preparation method thereof. The high-temperature catalytic purification metal fiber filter material consists of three layers of metal fiber felts, the pore diameter and the porosity of each layer of metal fiber felt are different, the filtering precision is in gradient distribution, and the filtering efficiency is higher; the third layer of metal fiber felt directly intercepts large particles outside the filter material, and has longer service life compared with the filter material with the same dirt holding capacity; the second layer of metal fiber felt contains a catalyst and can be used for carrying out catalytic denitration treatment on nitrogen oxides in gas; the high-temperature catalytic purification metal filter material has high porosity and low smoke resistance; the high-temperature catalytic purification metal fiber material is made of stainless steel, hastelloy and other materials, and has high corrosion resistance, high strength and long service life.
Description
Technical Field
The invention relates to the technical field of high-temperature flue gas purification, in particular to a high-temperature catalytic purification metal fiber filter material and a preparation method thereof.
Background
The high-temperature dust removal technology is characterized in that a high-temperature filter medium is used for directly realizing dust removal and purification of gas under a high-temperature condition, and the high-temperature dust removal technology mainly has the technical characteristics that (1) the dust removal temperature is high, and the high-temperature gas can reach 600-1000 ℃; (2) the dust removal and purification standard is high, the concentration of the outlet smoke dust is required to be lower than 20mg/m3, and (3) the corrosion resistance is strong.
At present, high-temperature flue gas is usually cooled by spraying, then a filter bag is subjected to dust removal and catalytic treatment to remove oxynitride in the high-temperature flue gas so as to achieve the aim of denitration, but the traditional process method has many defects: the resource waste, the dust removal purification cost is too high, the occupied area of the equipment is large, the maintenance is difficult, and the like. The metal fiber felt filtering material is a novel high-efficiency air filtering material and has the characteristics of strong corrosion resistance, high temperature resistance, high strength, high filtering precision and the like. The method has wide application in the industries of chemical industry, textile industry, thermal power generation, metallurgy and the like.
The sintered metal fiber filter material disclosed in the Chinese patent publication No. CN103170186A is made of multiple layers of sintered metal fiber felts, and achieves the function of intercepting particulate matters through the pore diameter change of each layer of metal fiber felt, thereby achieving the purpose of purification and filtration. However, harmful gases in the flue gas cannot be removed from the high-temperature flue gas containing pollutants. Chinese patent publication No. CN102145241 discloses a method for preparing a denitration catalyst loaded on a polyphenylene sulfide filter material, which realizes an integrated function of filtration and purification by loading the denitration catalyst on the polyphenylene sulfide filter material, but the polyphenylene sulfide filter material is degraded at a high temperature for a long time, which affects the filtration efficiency of the filter material, reduces the service life thereof, and cannot realize an expected effect.
In view of the above, there is a need for an improved high temperature flue gas filtering material in the prior art to solve the above problems.
Disclosure of Invention
The invention aims to disclose a high-temperature flue gas catalytic purification metal filter material, which contains a catalyst to purify harmful gas and realize catalytic purification integrated treatment of high-temperature flue gas.
In order to achieve the purpose, the invention provides a high-temperature catalytic purification metal fiber filter material, which comprises a first layer of metal fiber felt, a second layer of metal fiber felt and a third layer of metal fiber felt which are sequentially arranged from bottom to top; the second layer of metal fiber felt contains a catalyst, and the catalyst is V2O5/TiO2。
In some embodiments, the first layer of metal fiber felt is composed of one or a combination of 316L stainless steel, 304L stainless steel, 310S stainless steel, FeCrAl alloy and Hastelloy, the porosity of the first layer of metal fiber felt is 40-70%, and the pore diameter of the first layer of metal fiber felt is 10-30 μm.
In some embodiments, the second layer of metal fiber felt is composed of one or a combination of 316L stainless steel, 304L stainless steel and 310S stainless steel, the porosity of the second layer of metal fiber felt is 50-80%, and the pore diameter of the second layer of metal fiber felt is 1-10 μm.
In some embodiments, the third layer of metal fiber felt is made of ultra-fine metal fibers, the diameter of the ultra-fine metal fibers is 10nm to 1 μm, the porosity of the third layer of metal fiber felt is 70 to 80%, and the pore diameter of the third layer of metal fiber felt is 0.2 to 3 μm.
In some embodiments, the ultra-fine metallic fibers are composed of one or a combination of 316L stainless steel, FeCrAl alloy, hastelloy.
In order to realize the high-temperature catalytic purification metal fiber filter material, the invention also provides a preparation method of the high-temperature catalytic purification metal fiber filter material, which comprises the following steps:
(1) placing the second layer of metal fiber felt in a sulfuric acid solution with the concentration of 0.1-0.5 mol/L, soaking for 5-8 min, taking out, cleaning with ultrapure water, and drying for later use;
(2) preparation of the second layer of catalyst-loaded metal fiber felt: weighing TiO2 particles, adding the TiO2 particles into deionized water, performing ultrasonic dispersion to form a suspension with the mass fraction of 8%, then dipping a second layer of metal fiber felt into the suspension for 2-5 min, taking out the dipped metal fiber felt, drying the dipped metal fiber felt at 80-100 ℃ for 3-5 h to obtain a TiO 2-loaded second layer of metal fiber felt, dipping the TiO 2-loaded second layer of metal fiber felt into NH with the mass fraction of 8-12%4VO3Soaking in the aqueous solution for 3-5 min, taking out, drying at 80-100 ℃ for 3-5 h, calcining in a vacuum furnace at 500 ℃ for 4-6 h, taking out, and cooling to room temperature to obtain a second layer of metal fiber felt loaded with the catalyst;
(3) rolling the second layer of metal fiber felt and the first layer of metal fiber felt in the step (2) in a flattening machine, feeding the rolled metal fiber felt into a vacuum sintering furnace for primary sintering and heat preservation, obtaining a metal sintered felt after sintering, and cooling the metal sintered felt to room temperature for later use;
(4) and (4) rolling the metal sintered felt obtained in the step (3) and the third layer of metal fiber felt in a flattening machine again, sending the rolled metal sintered felt and the third layer of metal fiber felt into a vacuum sintering furnace for secondary sintering and heat preservation, and finally cooling the metal sintered felt and the third layer of metal fiber felt to room temperature to obtain the high-temperature catalytic purification metal fiber filter material.
In some embodiments, the first sintering temperature in the step (3) is 1100-1300 ℃, and the holding time is 2-5 h.
In some embodiments, the temperature of the second sintering in the step (4) is 900-1100 ℃, and the holding time is 3-5 h.
Compared with the prior art, the invention has the beneficial effects that: 1. the high-temperature catalytic purification metal fiber filter material consists of three layers of metal fiber felts, the pore diameter and the porosity of each layer of metal fiber felt are different, the filtering precision is in gradient distribution, and the filtering efficiency is higher; 2. the third layer of metal fiber felt directly intercepts large particles outside the filter material, and has longer service life compared with the filter material with the same dirt holding capacity; 3. the second layer of metal fiber felt contains a catalyst and can be used for carrying out catalytic denitration treatment on nitrogen oxides in gas; 4. the high-temperature catalytic purification metal filter material has high porosity and low smoke resistance; 5. the high-temperature catalytic purification metal fiber material is made of stainless steel, hastelloy and other materials, and has high corrosion resistance, high strength and long service life.
Drawings
FIG. 1 is a schematic view of a high-temperature catalytic purification metal fiber filter material;
description of reference numerals: 1. a first layer of metal fiber mat; 2. a second layer of metal fiber mat; 21. a catalyst; 3. and a third layer of metal fiber felt.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
Example 1
As shown in fig. 1, a high-temperature catalytic purification metal fiber filter material comprises a first layer of metal fiber felt 1, a second layer of metal fiber felt 2 and a third layer of metal fiber felt 3 which are sequentially arranged from bottom to top; the second layer of metal fiber mat 2 contains a catalyst 21.
The first layer of metal fiber felt 1 is made of one or a combination of 316L stainless steel, 304L stainless steel, 310S stainless steel, FeCrAl alloy and Hastelloy, and the 316L stainless steel is preferred in the embodiment. The porosity of the first layer of metal fiber felt 1 is 40%, the aperture of the first layer of metal fiber felt 1 is 10 microns, and the thickness of the first layer of metal fiber felt 1 is 1-6 mm.
The second layer of metal fiber felt 2 is composed of one or a combination of 316L stainless steel, 304L stainless steel and 310S stainless steel, and the embodiment prefers 304L stainless steelAnd (3) stainless steel. The porosity of the second layer of metal fiber felt 2 is 50%, and the pore diameter of the second layer of metal fiber felt 2 is 1 μm. The thickness of the second layer of metal fiber felt 2 is 0.1-5 mm. The second layer of metal fiber felt 2 contains a catalyst 21, and the type of the catalyst 21 is V2O5、V2O3Mn-Ti-Al ternary catalyst, V2O5-WO3/TiO2、V2O5/TiO2In this embodiment, the catalyst 21 is preferably V2O5/TiO2。
The third layer of metal fiber felt 3 is made of superfine metal fibers, the diameter of the superfine metal fibers is 1 mu m, the porosity of the third layer of metal fiber felt 3 is 70%, and the pore diameter of the third layer of metal fiber felt 3 is 0.2 mu m. The thickness of the third layer of metal fiber felt 3 is 0.1-0.5 mm. The superfine metal fiber is composed of one or a combination of 316L stainless steel, FeCrAl alloy and Hastelloy, and Hastelloy is preferred in the embodiment.
In order to realize the above high-temperature catalytic purification metal fiber filter material, this embodiment further provides a preparation method of the high-temperature catalytic purification metal fiber filter material, including the following steps:
(1) placing the second layer of metal fiber felt 2 in a sulfuric acid solution with the concentration of 0.1mol/L, soaking for 5min, taking out, cleaning with ultrapure water, and drying for later use;
(2) preparation of the catalyst-supporting second layer of metal fiber mat 2: weighing TiO2 particles, adding the TiO2 particles into deionized water, forming a suspension with the mass fraction of 8% after ultrasonic dispersion, then dipping a second layer of metal fiber felt 2 into the suspension for 2min, taking out the second layer of metal fiber felt and drying the second layer of metal fiber felt at 80 ℃ for 3h to obtain a TiO 2-loaded second layer of metal fiber felt 2, and dipping the TiO 2-loaded second layer of metal fiber felt 2 into NH with the mass fraction of 8%4VO3Soaking in the aqueous solution for 3min, taking out, drying at 80 ℃ for 3h, calcining in a vacuum furnace at 500 ℃ for 4h, taking out, cooling to room temperature, and obtaining a second layer of metal fiber felt 2 loaded with the catalyst;
(3) rolling the second layer of metal fiber felt 2 and the first layer of metal fiber felt 1 in the step (2) in a flattening machine, feeding the rolled metal fiber felt into a vacuum sintering furnace for primary sintering and heat preservation, obtaining a metal sintered felt after sintering, and cooling the metal sintered felt to room temperature for later use;
(4) and (4) rolling the metal sintered felt obtained in the step (3) and the third layer of metal fiber felt 3 in a flattening machine again, sending the rolled metal sintered felt and the third layer of metal fiber felt into a vacuum sintering furnace for secondary sintering and heat preservation, and finally cooling the metal sintered felt and the third layer of metal fiber felt to room temperature to obtain the high-temperature catalytic purification metal fiber filter material.
Wherein, the first sintering temperature in the step (3) is 1100 ℃, and the heat preservation time is 2 hours. In the step (4), the second sintering temperature is 900 ℃, and the heat preservation time is 3 hours.
Example 2
As shown in fig. 1, a high-temperature catalytic purification metal fiber filter material comprises a first layer of metal fiber felt 1, a second layer of metal fiber felt 2 and a third layer of metal fiber felt 3 which are sequentially arranged from bottom to top; the second layer of metal fiber mat 2 contains a catalyst 21.
The first layer of metal fiber felt 1 is made of one or a combination of 316L stainless steel, 304L stainless steel, 310S stainless steel, FeCrAl alloy and Hastelloy, and 310S stainless steel is preferred in the embodiment. The porosity of the first layer of metal fiber felt 1 is 60%, and the pore diameter of the first layer of metal fiber felt 1 is 20 μm. The thickness of the first layer of metal fiber felt 1 is 2-10 mm.
The second layer of metal fiber felt 2 is made of one or a combination of 316L stainless steel, 304L stainless steel and 310S stainless steel, and 310S stainless steel is preferred in the embodiment. The porosity of the second layer of metal fiber felt 2 is 70%, and the pore diameter of the second layer of metal fiber felt 2 is 6 μm. The thickness of the second layer of metal fiber felt 2 is 0.1-2 mm. The second layer of metal fiber felt 2 contains a catalyst 21, and the type of the catalyst 21 is V2O5、V2O3Mn-Ti-Al ternary catalyst, V2O5-WO3/TiO2、V2O5/TiO2In this embodiment, the catalyst 21 is preferably V2O5/TiO2。
The third layer of metal fiber felt 3 is made of superfine metal fibers, the diameter of the superfine metal fibers is 500nm, the porosity of the third layer of metal fiber felt 3 is 75%, and the pore diameter of the third layer of metal fiber felt 3 is 1 mu m. The thickness of the third layer of metal fiber felt 3 is 0.1-0.4 mm. The superfine metal fiber is composed of one or a combination of 316L stainless steel, FeCrAl alloy and Hastelloy, and FeCrAl alloy is preferred in the embodiment.
In order to realize the high-temperature catalytic purification metal fiber filter material, the invention also provides a preparation method of the high-temperature catalytic purification metal fiber filter material, which comprises the following steps:
(1) placing the second layer of metal fiber felt 2 in a sulfuric acid solution with the concentration of 0.3mol/L, soaking for 6min, taking out, cleaning with ultrapure water, and drying for later use;
(2) preparation of the catalyst-supporting second layer of metal fiber mat 2: weighing TiO2 particles, adding the TiO2 particles into deionized water, forming a suspension with the mass fraction of 8% after ultrasonic dispersion, then dipping a second layer of metal fiber felt 2 into the suspension for 4min, taking out the second layer of metal fiber felt and drying the second layer of metal fiber felt at 90 ℃ for 4h to obtain a TiO 2-loaded second layer of metal fiber felt 2, and dipping the TiO 2-loaded second layer of metal fiber felt 2 into NH with the mass fraction of 10%4VO3Soaking in the aqueous solution for 4min, taking out, drying at 90 ℃ for 4h, calcining in a vacuum furnace at 500 ℃ for 5h, taking out, and cooling to room temperature to obtain a second layer of metal fiber felt 2 loaded with the catalyst;
(3) rolling the second layer of metal fiber felt 2 and the first layer of metal fiber felt 1 in the step (2) in a flattening machine, feeding the rolled metal fiber felt into a vacuum sintering furnace for primary sintering and heat preservation, obtaining a metal sintered felt after sintering, and cooling the metal sintered felt to room temperature for later use;
(4) and (4) rolling the metal sintered felt obtained in the step (3) and the third layer of metal fiber felt 3 in a flattening machine again, sending the rolled metal sintered felt and the third layer of metal fiber felt into a vacuum sintering furnace for secondary sintering and heat preservation, and finally cooling the metal sintered felt and the third layer of metal fiber felt to room temperature to obtain the high-temperature catalytic purification metal fiber filter material.
Wherein, the first sintering temperature in the step (3) is 1200 ℃, and the heat preservation time is 3 h. In the step (4), the second sintering temperature is 1000 ℃, and the heat preservation time is 4 hours.
Example 3
As shown in fig. 1, a high-temperature catalytic purification metal fiber filter material comprises a first layer of metal fiber felt 1, a second layer of metal fiber felt 2 and a third layer of metal fiber felt 3 which are sequentially arranged from bottom to top; the second layer of metal fiber mat 2 contains a catalyst 21.
The first layer of metal fiber felt 1 is made of one or a combination of 316L stainless steel, 304L stainless steel, 310S stainless steel, FeCrAl alloy and Hastelloy, and the 316L stainless steel is preferred in the embodiment. The porosity of the first layer of metal fiber felt 1 is 70%, and the pore diameter of the first layer of metal fiber felt 1 is 30 μm. The thickness of the first layer of metal fiber felt 1 is 3-8 mm.
The second layer of metal fiber felt 2 is made of one or a combination of 316L stainless steel, 304L stainless steel and 310S stainless steel, and the 316L stainless steel is preferred in the embodiment. The porosity of the second layer of metal fiber felt 2 is 80%, and the pore diameter of the second layer of metal fiber felt 2 is 10 μm. The thickness of the second layer of metal fiber felt 2 is 0.2-5 mm. The second layer of metal fiber felt 2 contains a catalyst 21, and the type of the catalyst 21 is V2O5、V2O3Mn-Ti-Al ternary catalyst, V2O5-WO3/TiO2、V2O5/TiO2In this embodiment, the catalyst 21 is preferably V2O5/TiO2。
The third layer of metal fiber felt 3 is made of superfine metal fibers, the diameter of the superfine metal fibers is 1 mu m, the porosity of the third layer of metal fiber felt 3 is 80%, and the pore diameter of the third layer of metal fiber felt 3 is 3 mu m. The thickness of the third layer of metal fiber felt 3 is 0.2-0.3 mm. The superfine metal fiber is composed of one or a combination of 316L stainless steel, FeCrAl alloy and Hastelloy, and 316L stainless steel is preferred in the embodiment.
In order to realize the high-temperature catalytic purification metal fiber filter material, the invention also provides a preparation method of the high-temperature catalytic purification metal fiber filter material, which comprises the following steps:
(1) placing the second layer of metal fiber felt 2 in a sulfuric acid solution with the concentration of 0.5mol/L, soaking for 8min, taking out, cleaning with ultrapure water, and drying for later use;
(2) second layer of metal supporting catalystPreparation of fiber mat 2: weighing TiO2 particles, adding the TiO2 particles into deionized water, forming suspension with the mass fraction of 8% after ultrasonic dispersion, then dipping a second layer of metal fiber felt 2 into the suspension for 5min, taking out the second layer of metal fiber felt after dipping, drying the second layer of metal fiber felt at 100 ℃ for 5h to obtain a TiO 2-loaded second layer of metal fiber felt 2, dipping the TiO 2-loaded second layer of metal fiber felt 2 into NH with the mass fraction of 12%4VO3Soaking in the aqueous solution for 5min, taking out, drying at 100 ℃ for 5h, calcining in a vacuum furnace at 500 ℃ for 6h, taking out, and cooling to room temperature to obtain a second layer of metal fiber felt 2 loaded with the catalyst;
(3) rolling the second layer of metal fiber felt 2 and the first layer of metal fiber felt 1 in the step (2) in a flattening machine, feeding the rolled metal fiber felt into a vacuum sintering furnace for primary sintering and heat preservation, obtaining a metal sintered felt after sintering, and cooling the metal sintered felt to room temperature for later use;
(4) and (4) rolling the metal sintered felt obtained in the step (3) and the third layer of metal fiber felt 3 in a flattening machine again, sending the rolled metal sintered felt and the third layer of metal fiber felt into a vacuum sintering furnace for secondary sintering and heat preservation, and finally cooling the metal sintered felt and the third layer of metal fiber felt to room temperature to obtain the high-temperature catalytic purification metal fiber filter material.
Wherein, the first sintering temperature in the step (3) is 1300 ℃, and the heat preservation time is 5 h. In the step (4), the second sintering temperature is 1100 ℃, and the heat preservation time is 5 hours.
The metal filter materials prepared in examples 1 to 3 were subjected to an air permeability test, a filtration efficiency test, and a denitration efficiency test, and experimental data in the following table were obtained.
TABLE 1 test of the Performance of the metallic filter of each example
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A high-temperature catalytic purification metal fiber filter material is characterized by comprising a first layer of metal fiber felt, a second layer of metal fiber felt and a third layer of metal fiber felt which are sequentially arranged from bottom to top; the second layer of metal fiber felt contains a catalyst, and the catalyst is V2O5/TiO2。
2. The high-temperature catalytic purification metal fiber filter material as claimed in claim 1, wherein the first layer of metal fiber felt is composed of one or a combination of 316L stainless steel, 304L stainless steel, 310S stainless steel, FeCrAl alloy and Hastelloy, the porosity of the first layer of metal fiber felt is 40-70%, and the pore diameter of the first layer of metal fiber felt is 10-30 μm.
3. The high-temperature catalytic purification metal fiber filter material as claimed in claim 1, wherein the second layer of metal fiber felt is composed of one or a combination of 316L stainless steel, 304L stainless steel and 310S stainless steel, the porosity of the second layer of metal fiber felt is 50-80%, and the pore diameter of the second layer of metal fiber felt is 1-10 μm.
4. The high-temperature catalytic purification metal fiber filter material as claimed in claim 1, wherein the third layer of metal fiber felt is made of ultra-fine metal fibers, the diameter of the ultra-fine metal fibers is 10nm to 1 μm, the porosity of the third layer of metal fiber felt is 70 to 80%, and the pore diameter of the third layer of metal fiber felt is 0.2 to 3 μm.
5. The filter material of claim 4, wherein the ultra fine metal fibers are made of one or a combination of 316L stainless steel, FeCrAl alloy and Hastelloy.
6. The preparation method of the high-temperature catalytic purification metal fiber filter material as claimed in any one of claims 1 to 5, which comprises the following steps:
(1) placing the second layer of metal fiber felt in a sulfuric acid solution with the concentration of 0.1-0.5 mol/L, soaking for 5-8 min, taking out, cleaning with ultrapure water, and drying for later use;
(2) preparation of the second layer of catalyst-loaded metal fiber felt: weighing TiO2 particles, adding the TiO2 particles into deionized water, performing ultrasonic dispersion to form a suspension with the mass fraction of 8%, then dipping a second layer of metal fiber felt into the suspension for 2-5 min, taking out the dipped metal fiber felt, drying the dipped metal fiber felt at 80-100 ℃ for 3-5 h to obtain a TiO 2-loaded second layer of metal fiber felt, dipping the TiO 2-loaded second layer of metal fiber felt into NH with the mass fraction of 8-12%4VO3Soaking in the aqueous solution for 3-5 min, taking out, drying at 80-100 ℃ for 3-5 h, calcining in a vacuum furnace at 500 ℃ for 4-6 h, taking out, and cooling to room temperature to obtain a second layer of metal fiber felt loaded with the catalyst;
(3) rolling the second layer of metal fiber felt and the first layer of metal fiber felt in the step (2) in a flattening machine, feeding the rolled metal fiber felt into a vacuum sintering furnace for primary sintering and heat preservation, obtaining a metal sintered felt after sintering, and cooling the metal sintered felt to room temperature for later use;
(4) and (4) rolling the metal sintered felt obtained in the step (3) and the third layer of metal fiber felt in a flattening machine again, sending the rolled metal sintered felt and the third layer of metal fiber felt into a vacuum sintering furnace for secondary sintering and heat preservation, and finally cooling the metal sintered felt and the third layer of metal fiber felt to room temperature to obtain the high-temperature catalytic purification metal fiber filter material.
7. The preparation method of the high-temperature catalytic purification metal fiber filter material as claimed in claim 6, wherein the first sintering temperature in the step (3) is 1100-1300 ℃, and the heat preservation time is 2-5 h.
8. The preparation method of the high-temperature catalytic purification metal fiber filter material as claimed in claim 6, wherein the second sintering temperature in the step (4) is 900-1100 ℃, and the heat preservation time is 3-5 h.
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