CN113813697B - Metal fiber filter material with functions of dust removal and catalytic purification of VOCs and preparation method thereof - Google Patents
Metal fiber filter material with functions of dust removal and catalytic purification of VOCs and preparation method thereof Download PDFInfo
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- CN113813697B CN113813697B CN202110905459.6A CN202110905459A CN113813697B CN 113813697 B CN113813697 B CN 113813697B CN 202110905459 A CN202110905459 A CN 202110905459A CN 113813697 B CN113813697 B CN 113813697B
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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
- B01D39/02—Loose filtering material, e.g. loose fibres
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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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- 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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- B01J23/16—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
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/26—Chromium
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- B01J23/32—Manganese, technetium or rhenium
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- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/83—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with rare earths or actinides
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Abstract
The invention discloses a preparation method of a metal fiber filter material with functions of dust removal and catalytic purification of VOCs, which comprises the following steps: providing a metal fiber felt substrate; preparing a catalyst precursor solution, wherein the catalyst precursor solution comprises a precursor and a flammable solvent; feeding the catalyst precursor solution into a burner by adopting atomization sample feeding, and mixing the atomized catalyst precursor solution with an oxidant in the burner; adding fuel and bath gas into a combustor to enable the atomized catalyst precursor solution, oxidant, fuel and bath gas to burn together; the atomized catalyst precursor solution is pyrolyzed to form a catalyst core; the catalyst nuclei gather and grow up and deposit on the metal fiber felt substrate to form the metal fiber filter material with the functions of dust removal and catalytic purification of VOCs. The invention also provides a metal fiber filter material with the functions of dust removal and catalytic purification of VOCs, which is obtained by the method, and application of the metal fiber filter material in purifying mixed waste gas containing dust and VOCs.
Description
Technical Field
The invention relates to the field of flue gas purification, in particular to a metal fiber filter material with functions of dust removal and catalytic purification of VOCs and a preparation method thereof.
Background
Volatile organic compounds (Volatile Organic Compounds, VOCs for short) are organic compounds having a saturated vapor pressure of about 70Pa or more at ordinary temperature and a boiling point of less than 260 ℃ at ordinary pressure.
In industrial production and fuel combustion processes, dust and various volatile organic compounds are inevitably generated, and particularly in the processes of high-temperature heating and organic solvent cooling, the volatilization of the high-temperature dust and the organic compounds is greatly generated, and the purification treatment is needed. In order to reduce the cost and realize the low-carbon and high-efficiency short-flow treatment effect, the metal fiber high-temperature filter material is more and more paid attention to.
At present, the metal fiber filter material mainly plays a role of filtering dust, but the dust and organic matters are mostly generated simultaneously in the industrial production process, and are simultaneously mixed and discharged to the waste gas purifying treatment equipment. Therefore, the dust-removing filter materials made of metal fibers, natural fiber filter materials, chemical fibers or glass fibers with single functions are often blocked or aged due to cooling and aggregation of organic matters, and the purification performance is lost; and meanwhile, other VOCs treatment equipment is required to be arranged for recycling or purifying the discharged organic waste gas, so that the investment cost of enterprises is increased.
In the related art, a preparation method of a filter material for simultaneously removing dust and catalyzing and removing harmful gases is mentioned in Chinese patent literature with publication number of CN104226020B, and the filter material prepared by the method comprises a dust facing layer, a buffer layer, a catalytic filter layer and a supporting layer which are sequentially laminated; wherein, the SiO is prepared by electrostatic spinning through the catalytic filter layer 2 -TiO 2 After the nanofibers, the catalytically active component is supported on the nanofibers by solvothermal synthesis. However, since the preparation method adopts SiO 2 -TiO 2 The composite nano fiber of the material has complex manufacturing process and high cost, is not suitable for large-scale production and manufacturing, needs auxiliary matching of structures such as a windward layer, a buffer layer, a supporting layer and the like, has long manufacturing flow,is not efficient and is expensive. And 10.27.2017, the cancer list published by the world health organization international cancer research institute preliminarily sets reference, special purpose fibers such as E glass and "475" glass fibers in the class 2B cancer list, continuous glass fibers in the class 3 cancer list, and glass fiber filter materials have been phased into the phase of elimination.
Based on the above conditions, the development of a novel metal fiber filter material with functions of dust removal and catalytic purification of VOCs has important significance.
Disclosure of Invention
In view of this, in order to simultaneously purify the mixed exhaust gas containing dust and VOCs, the present invention provides a metal fiber filter material having functions of dust removal and catalytic purification of VOCs and a method for preparing the same.
The invention provides a preparation method of a metal fiber filter material with functions of dust removal and catalytic purification of VOCs, which comprises the following steps: providing a metal fiber felt substrate; depositing a catalyst on a metal fiber felt substrate by adopting a flame spraying catalyst loading method to form a metal fiber filter material with functions of dust removal and catalytic purification of VOCs; wherein, the method for depositing the catalyst on the metal fiber mat substrate by adopting the flame spraying catalyst loading method comprises the following steps: preparing a catalyst precursor solution, wherein the catalyst precursor solution comprises a precursor and a flammable solvent; feeding the catalyst precursor solution into a burner by adopting atomization sample feeding, and mixing the atomized catalyst precursor solution with an oxidant in the burner; adding fuel and bath gas into a combustor to enable the atomized catalyst precursor solution, oxidant, fuel and bath gas to burn together; the atomized catalyst precursor solution is pyrolyzed to form a catalyst core; the catalyst nuclei aggregate, grow up and deposit onto the metal fiber mat substrate.
In some embodiments, the burner is one or more; the burner includes a plurality of flame distributors uniformly distributed in the burner.
In some embodiments, the metal fiber felt substrate comprises a stainless steel fiber felt, an iron-chromium-aluminum fiber felt, or a hastelloy fiber felt.
In some embodiments, providing a metal fiber felt substrate includes: and (3) carrying out composite assembly on the metal wires by utilizing a cluster drawing process, carrying out multi-time multi-strand drawing to manufacture micron-sized fiber wires, and carrying out felt laying, vacuum sintering and welding assembly on the micron-sized fiber wires to obtain the metal fiber felt substrate.
In some embodiments, the catalyst comprises at least one of: iridium oxide, palladium oxide, ruthenium oxide, rhodium oxide, iron oxide, cerium oxide, aluminum oxide, chromium oxide, barium oxide, zinc oxide, lanthanum cobalt oxide, lanthanum manganese oxide, and perovskite.
In some embodiments, the nebulization is pulsed nebulization, and the radiofrequency of the pulsed nebulization and the pulse width control the growth rate of the catalyst core, wherein the radiofrequency is less than 100Hz and the pulse width is on the order of milliseconds.
In some embodiments, the oxidizing agent comprises one of: air, oxygen, a mixture of air and oxygen.
In some embodiments, the fuel comprises a gaseous fuel or a liquid fuel.
In some embodiments, the bath gas comprises nitrogen or an inert gas.
In some embodiments, the amount of oxidant entering the burner is regulated using a first flow controller; regulating the amount of fuel entering the burner by using a second flow controller; the amount of the bath gas entering the burner is regulated and controlled by a third flow controller.
In some embodiments, the precursor comprises at least one of: iridium acetylacetonate, palladium acetate, ruthenium acetate, rhodium acetylacetonate, iron acetylacetonate, cerium acetylacetonate, aluminum acetylacetonate, chromium acetylacetonate, barium acetylacetonate, zinc acetylacetonate hydrate, lanthanum acetylacetonate hydrate, cobalt acetylacetonate, manganese acetylacetonate, and lanthanum acetate hydrate.
In some embodiments, the flammability aid comprises ethanol.
In some embodiments, the concentration of the precursor is on the order of millimoles per liter.
The invention also provides a metal fiber filter material with the functions of dust removal and catalytic purification of VOCs, which is obtained by the preparation method.
The invention also provides application of the metal fiber filter material in purifying mixed waste gas containing dust and VOCs.
The metal fiber filter material with the functions of dust removal and catalytic purification of VOCs and the preparation method thereof have the following beneficial effects:
(1) Can purify dust and VOCs gas simultaneously, is applicable to the purification treatment and contains the mixed waste gas of VOCs gas and dust.
(2) The preparation method has the advantages of simple process, safety, high efficiency and no secondary pollution, and the dust facing layer, the buffer layer, the catalytic filter layer and the supporting layer of the laminated layers do not need to be prepared.
(3) The structure of the catalyst can be regulated and controlled by controlling the amounts of the atomized catalyst precursor solution, the oxidant, the fuel and the bath gas, and the preparation process is stable and reliable.
Drawings
FIG. 1 is a flow chart of the preparation of a metal fiber filter material provided by an embodiment of the invention;
fig. 2 is a schematic diagram of a preparation process of a metal fiber filter material according to an embodiment of the present invention;
FIG. 3 is a flow chart of the preparation of a metal fiber mat substrate provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a metal fiber filter material according to an embodiment of the present invention.
[ reference numerals description ]
1-a metal fiber blanket substrate; a 2-burner; 3-a catalyst precursor solution inlet; 4-pulse nozzle; 5-oxidant inlet; 6-fuel and bath gas inlets; 7-atomized catalyst precursor solution; 8-flame distributor; 9-catalyst particle layer
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
The invention provides a metal fiber filter material with functions of dust removal and catalytic purification of VOCs and a preparation method thereof. And depositing a catalyst on the metal fiber felt substrate by adopting a flame spraying catalyst loading method to form the metal fiber filter material with the functions of dust removal and catalytic purification of VOCs. The flame spraying catalyst loading method is characterized in that a catalyst precursor solution is atomized and injected, and sprayed into flame to react to form a pre-preparation material core, and the pre-preparation material core is sprayed on a metal fiber felt substrate to synthesize a film or nano particles with strong stability and high activity.
Fig. 1 is a flowchart of a preparation process of a metal fiber filter material according to an embodiment of the present invention. Fig. 2 is a schematic diagram of a preparation process of a metal fiber filter material according to an embodiment of the present invention. As shown in fig. 1 and 2, the preparation method includes operations S101 to S107.
In operation S101, a metal fiber felt substrate 1 is provided, including selection and pretreatment of the metal fiber felt substrate 1.
According to an embodiment of the present invention, the metal fiber felt substrate 1 may be a stainless steel fiber felt, an iron-chromium-aluminum fiber felt, or a hastelloy fiber felt.
According to the embodiment of the invention, the metal fiber felt substrate 1 has the function of filtering dust, and can intercept particles with the size of about 0.5 μm. The metal fiber felt substrate 1 has the characteristics of high porosity (up to 90 percent) and good air permeability.
According to an embodiment of the invention, a suitable metal fiber mat is selected as a substrate according to the actual process requirements. According to the difference of the temperature of the waste gas to be treated, the metal fiber felt substrate 1 used under different temperature conditions is selected. Wherein the stainless steel metal fiber felt can be used for a long time below 450 ℃, and the iron-chromium-aluminum fiber felt can be used for a long time below 600 ℃. Fig. 3 is a flowchart of a preparation process of the metal fiber mat substrate 1 according to the embodiment of the present invention.
Referring to fig. 3, providing a metal fiber mat substrate 1 includes: and (3) carrying out composite assembly and multi-strand drawing on the metal wires by utilizing a cluster drawing process to manufacture micron-sized fiber wires, and carrying out felt laying, vacuum sintering and welding assembly on the micron-sized fiber wires to obtain the metal fiber felt. The technology can be used for producing the metal fiber felt on a large scale, and has the advantages of high efficiency, low price and no secondary pollution.
According to an embodiment of the invention, the category of wire may be 316L, 310S or FeCrAl.
According to embodiments of the present invention, different types and sizes of wires may be selected depending on the density of the supported catalyst.
The metal fiber felt substrate has the characteristic of easy ash removal, is easy to recycle and treat after being used, and cannot cause secondary pollution to the environment.
In operation S102, a catalyst precursor solution is configured, the catalyst precursor solution including a precursor and a flammable solvent.
According to an embodiment of the present invention, the precursor may include at least one of: iridium acetylacetonate, palladium acetate and ruthenium acetate.
According to the embodiment of the invention, the concentration of the precursor is configured according to the characteristics of the catalyst and the temperature requirement; wherein the concentration of the precursor is in the order of millimoles per liter.
According to the embodiment of the invention, the combustibility auxiliary agent can be ethanol or other alcohol solvents.
According to the embodiment of the invention, the selection of the catalyst is related to the preparation requirement of the metal fiber filter material, and the selection of the catalyst, the configuration of the precursor of the catalyst, the frequency of atomization sampling and the like are designed to be considered in combination with the preparation requirement of the metal fiber filter material.
In operation S103, the catalyst precursor solution is fed into the plurality of burners 2 using the atomized sample feeding, and the atomized catalyst precursor solution 7 and the oxidizing agent are mixed in the burners 2.
According to the embodiment of the invention, the mode of atomizing sample feeding comprises pulse atomizing sample feeding and gas impact.
According to the embodiment of the invention, pulse atomization sample feeding is adopted, and the precursor solution is atomized by using a pulse nozzle 4 and then fed into the burner 2, wherein the number of the pulse nozzles 4 can be multiple. The amount of atomized catalyst precursor solution 7 entering the burner can be controlled by controlling the on-off time of the pulse nozzle 4.
According to the embodiment of the invention, the stability of the catalyst concentration can be ensured by adopting atomization sample injection, so that the finally formed product has uniform morphology and stable performance.
According to an embodiment of the invention, the oxidant enters the burner 2 through the oxidant inlet 5 and is mixed with the atomized catalyst precursor solution 7 in the burner 2.
According to an embodiment of the invention, the oxidizing agent comprises one of: air, oxygen, a mixture of air and oxygen.
In operation S104, fuel and bath gas are added to the burner 2, and the atomized catalyst precursor solution 7, the oxidizing agent, the fuel and the bath gas are co-combusted.
According to an embodiment of the invention, the fuel comprises a gaseous fuel or a liquid fuel.
According to an embodiment of the invention, the bath gas comprises nitrogen or an inert gas.
According to an embodiment of the present invention, the amount of oxidant entering the burner 2 is regulated by a first flow controller (not shown); regulating the amount of fuel entering the burner 2 with a second flow controller (not shown); the amount of bath gas entering the burner 2 is regulated by a third flow controller (not shown). The structure of the catalyst can be regulated and controlled by controlling the amounts of the atomized catalyst precursor solution, the oxidant, the fuel and the bath gas.
According to an embodiment of the invention, each burner 2 comprises a plurality of flame distributors 8, the plurality of flame distributors 8 being evenly distributed in the burner 2.
It should be noted that, by adopting the system integration concept, the flame distributor and the single burner are organically combined, and the number and distribution modes of the flame distributor in the burner and the single burner can be adjusted according to the production requirements.
In operation S105, the atomized catalyst precursor solution 7 is pyrolyzed to form a catalyst core.
In operation S106, the catalyst nuclei are aggregated, grown, and deposited on the metal fiber mat substrate 1.
According to the embodiment of the invention, catalyst cores are gathered and grown to form a catalyst particle layer 9, and the metal fiber felt substrate 1 moves at a certain speed, so that the catalyst particle layer 9 is uniformly deposited on the metal fiber felt substrate 1 to form a metal fiber filter material.
According to the embodiment of the invention, the density of the catalyst load can be regulated and controlled by controlling the integration density of the flame distributor, so that different metal fiber filter materials can be prepared.
According to the embodiment of the invention, the burners can be positioned at two sides of the metal fiber felt substrate, the on-off of the burners at two sides of the metal fiber felt substrate is regulated, and the single-side load of the metal fiber felt substrate or the simultaneous loading of the catalysts at two sides of the metal fiber felt substrate can be realized. According to an embodiment of the present invention, the catalyst is a noble metal, a transition metal or a rare earth metal having catalytic properties, and oxides thereof.
According to an embodiment of the invention, the catalyst comprises at least one of: iridium oxide, palladium oxide, ruthenium oxide, rhodium oxide, iron oxide, cerium oxide, aluminum oxide, chromium oxide, barium oxide, zinc oxide, lanthanum cobalt oxide, lanthanum manganese oxide, and perovskite.
According to the embodiment of the invention, pulse atomization sampling can be adopted, and the radio frequency and pulse width of the pulse atomization sampling control the growth rate, thickness and stoichiometry of the catalyst, wherein the radio frequency is less than 100Hz, and the pulse width is in the millisecond order.
According to embodiments of the present invention, the structure of the catalyst may be controlled by controlling the average deposition rate as well as the deposition time.
Fig. 4 is a schematic structural diagram of a metal fiber filter material according to an embodiment of the present invention.
As shown in fig. 4, the catalyst generated by pyrolysis of the plurality of flame distributors 8 is uniformly deposited on the metal fiber mat substrate 1 in the form of a dense lattice of nano particles.
In operation S107, performance detection and processing treatment are performed on the prepared metal fiber filter material.
According to the embodiment of the invention, the metal fiber filter material deposited with the catalyst particles is further subjected to stacking, forming, ventilation, catalysis and filtering performance detection to form the qualified metal fiber filter material.
According to the embodiment of the invention, the catalyst can be prepared by selective adhesion according to the VOCs component and the exhaust gas temperature, and different catalyst components are combined and paired to form the catalytic purification metal fiber filter material with corresponding functions.
The invention also provides a metal fiber filter material with the functions of dust removal and catalytic purification of VOCs, which is obtained by the preparation method.
The invention also provides application of the metal fiber filter material in purifying mixed waste gas containing dust and VOCs.
According to the embodiment of the invention, the dust removing mechanism of the metal fiber filter material is that dust-containing gas passes through the metal fiber filter material at the initial stage, and then passes through the sieve filtration on the surface of the metal fiber filter material, so that the surface dust layer is rapidly formed under the actions of interception, collision and static electricity, and then the dust in the mixed waste gas containing dust and VOCs is filtered through the surface dust layer.
The metal fiber filter material provided by the embodiment of the invention can simultaneously purify dust and VOCs gas, and is suitable for treating mixed waste gas containing the VOCs gas and the dust. The mixed waste gas is not required to be dedusted by utilizing a metal fiber felt in advance, and then the catalytic purification is performed by utilizing a catalytic purification reactor. The metal fiber filter material provided by the embodiment of the invention improves the efficiency of catalytic purification of mixed waste gas.
The preparation method of the metal fiber filter material for catalytic purification of VOCs provided by the embodiment of the invention does not need to prepare a dust facing layer, a buffer layer, a catalytic filter layer and a supporting layer which are laminated, and the preparation method is simple in process, safe, efficient and free of secondary pollution.
The preparation method of the metal fiber filter material for catalytic purification of VOCs provided by the embodiment of the invention can regulate and control the structure of the catalyst by controlling the amounts of the atomized catalyst precursor solution, the oxidizer, the fuel and the bath gas, and the preparation process is stable and reliable.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the invention thereto, but to limit the invention thereto, and any modifications, equivalents, improvements and equivalents thereof may be made without departing from the spirit and principles of the invention.
Claims (8)
1. The preparation method of the metal fiber filter material with the functions of dust removal and catalytic purification of VOCs is characterized by comprising the following steps:
providing a metal fiber felt substrate with easy ash removal property, wherein the metal fiber felt substrate comprises a stainless steel fiber felt, an iron-chromium-aluminum fiber felt or a hastelloy fiber felt, and the preparation method of the metal fiber felt substrate comprises the following steps: utilizing a cluster drawing process to carry out composite assembly on metal wires, carrying out multi-time multi-strand drawing to manufacture micron-sized fiber wires, and carrying out felt laying, vacuum sintering and welding assembly on the fiber wires to obtain the metal fiber felt substrate; wherein the category of the metal wires of the metal fiber mat substrate comprises 316L and 310S, the stainless steel fiber mat is used below 450 ℃, and the iron-chromium-aluminum fiber mat is used below 600 ℃;
depositing a catalyst on the metal fiber felt substrate by adopting a flame spraying catalyst loading method to form a metal fiber filter material with functions of dust removal and catalytic purification of VOCs;
wherein, the method for depositing the catalyst on the metal fiber mat substrate by adopting the flame spraying catalyst loading method comprises the following steps:
preparing a catalyst precursor solution, wherein the catalyst precursor solution comprises a precursor and a flammable solvent;
feeding the catalyst precursor solution into a burner by adopting atomization sample injection, and mixing the atomized catalyst precursor solution with an oxidant in the burner;
adding fuel and bath gas into the burner to enable the atomized catalyst precursor solution, the oxidant, the fuel and the bath gas to be combusted together;
the atomized catalyst precursor solution is pyrolyzed to form a catalyst core;
the catalyst cores gather, grow up and deposit on the metal fiber felt substrate;
wherein the number of the burners is one or more; the burner comprises a plurality of flame distributors, and the flame distributors are uniformly distributed in the burner; the catalyst generated by pyrolysis of a plurality of flame distributors is uniformly deposited on the metal fiber substrate in the form of a nanoparticle dense lattice; the burners are positioned at two sides of the metal fiber felt substrate, and the on-off of the burners at two sides of the metal fiber felt substrate is regulated to realize the single-side load of the metal fiber felt substrate or the simultaneous load of the catalysts at two sides of the metal fiber felt substrate;
the dust removing method comprises the steps that dust-containing gas is filtered on the surface of the metal fiber filter material in the initial stage when passing through the metal fiber filter material, a surface dust layer is formed through interception, collision and electrostatic action, and then dust in mixed waste gas containing dust and VOCs is filtered through the surface dust layer.
2. The method of preparation of claim 1, wherein the catalyst comprises at least one of: iridium oxide, palladium oxide, ruthenium oxide, rhodium oxide, iron oxide, cerium oxide, aluminum oxide, chromium oxide, barium oxide, zinc oxide, lanthanum cobalt oxide, lanthanum manganese oxide, and perovskite.
3. The method of claim 1, wherein the nebulization sample is a pulsed nebulization sample, and wherein a radio frequency and a pulse width of the pulsed nebulization sample control a growth rate of the catalyst core, wherein the radio frequency is less than 100Hz and the pulse width is on the order of milliseconds.
4. The method of preparation of claim 1, wherein the oxidizing agent comprises one of: air, oxygen, a mixture of air and oxygen;
the fuel comprises a gaseous fuel or a liquid fuel;
the bath gas comprises nitrogen or an inert gas.
5. The method of claim 1, wherein the amount of oxidant entering the burner is regulated using a first flow controller; regulating the amount of fuel entering the burner with a second flow controller; the amount of the bath gas entering the burner is regulated by a third flow controller.
6. The method of preparing according to claim 1, wherein the precursor comprises at least one of: iridium acetylacetonate, palladium acetate, ruthenium acetate, rhodium acetylacetonate, iron acetylacetonate, cerium acetylacetonate, aluminum acetylacetonate, chromium acetylacetonate, barium acetylacetonate, zinc acetylacetonate hydrate, lanthanum acetylacetonate hydrate, cobalt acetylacetonate, manganese acetylacetonate, and lanthanum acetate hydrate;
the combustibility aids include ethanol;
the concentration of the precursor is in the order of millimoles per liter.
7. A metal fiber filter material with functions of dust removal and catalytic purification of VOCs, which is obtained by the preparation method of any one of claims 1 to 6.
8. Use of the metal fiber filter material of claim 7, for purifying mixed exhaust gas containing dust and VOCs.
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