CN114247886A - Preparation method of high-strength and high-permeability metal filter bag cylinder - Google Patents
Preparation method of high-strength and high-permeability metal filter bag cylinder Download PDFInfo
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- CN114247886A CN114247886A CN202011010390.2A CN202011010390A CN114247886A CN 114247886 A CN114247886 A CN 114247886A CN 202011010390 A CN202011010390 A CN 202011010390A CN 114247886 A CN114247886 A CN 114247886A
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 246
- 239000002184 metal Substances 0.000 title claims abstract description 246
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 170
- 238000003466 welding Methods 0.000 claims abstract description 39
- 238000005245 sintering Methods 0.000 claims abstract description 30
- 238000005520 cutting process Methods 0.000 claims abstract description 29
- 239000010410 layer Substances 0.000 claims abstract description 25
- 239000000919 ceramic Substances 0.000 claims abstract description 19
- 239000004744 fabric Substances 0.000 claims abstract description 19
- 239000011229 interlayer Substances 0.000 claims abstract description 18
- 238000004140 cleaning Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 10
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 229910000838 Al alloy Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 238000009960 carding Methods 0.000 claims description 4
- -1 iron-chromium-aluminum Chemical compound 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 238000003892 spreading Methods 0.000 claims 5
- 238000004519 manufacturing process Methods 0.000 claims 4
- 230000004888 barrier function Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 13
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000428 dust Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
-
- 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
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2411—Filter cartridges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/002—Manufacture of articles essentially made from metallic fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
- B22F7/04—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal
Abstract
The invention discloses a preparation method of a high-strength and high-permeability metal filter bag cylinder, which comprises the steps of firstly selecting proper metal fiber wires, cutting or drawing the metal fiber wires, and then cleaning the metal fiber wires to obtain uniform metal fiber wires; paving metal fiber wires by adopting a felt paving machine to obtain a fiber net; selecting a proper metal wire mesh, and uniformly cutting; overlapping at least one layer of fiber mesh and a metal wire mesh, covering a ceramic cloth interlayer on the upper surface and the lower surface of the fiber mesh and the metal wire mesh, then sending the fiber mesh and the metal wire mesh into a high-temperature vacuum furnace for vacuum high-temperature sintering treatment, and taking out the fiber mesh and the metal wire mesh after cooling to obtain the fiber mesh-metal wire mesh; and processing the sintered fiber mesh-metal wire mesh into a filter bag cylinder in a welding mode, and cutting to obtain the high-strength high-permeability metal filter bag cylinder. The high-strength high-permeability metal filter bag cylinder prepared by the invention solves the problems of low strength of the filter bag cylinder, easy occurrence of filter material welding leakage and weak mechanical property area during welding in the prior art.
Description
Technical Field
The invention relates to the technical field of flue gas treatment, in particular to a preparation method of a high-strength and high-permeability metal filter bag cylinder.
Background
The metal filter bag has the advantages of high temperature resistance, corrosion resistance, capability of recycling, ultralow emission and the like, and is widely applied to bag type dust removal/filters in heavy chemical industries such as electric power, chemical industry, metallurgy, building materials and the like. According to different requirements of flue gas amount and emission, the bag-type dust removal/filter is provided with metal filter bags with different numbers. In the heavy chemical industry, because of the characteristic of large smoke volume, a long filter bag (generally requiring the length of the filter bag to be more than 5 meters) must be adopted, so that the bag-type dust removal/filtration equipment is huge and cannot be industrially applied.
The filter bag cylinder body of the metal filter bag is formed by butt joint of a plurality of cylindrical metal filter materials. Common metal filter materials include metal fiber felt and metal fiber felt with metal wire mesh covered on both sides. (1) The filter bag cylinder made of the metal fiber felt has the following defects: the strength is relatively low, the welding with the flange and the bottom cover is not easy, the welding between two sections of metal fiber felts is not easy, the welding leakage of the filter material and the weak area of the mechanical property are easy to occur. (2) The filter bag cylinder made of the metal fiber felt with the metal meshes coated on the two sides has relatively good air permeability and welding performance, but has high cost.
Disclosure of Invention
The invention aims to provide a preparation method of a high-strength and high-permeability metal filter bag cylinder, and solves the problems that the filter bag cylinder in the prior art is low in strength, easy to leak during welding and weak in mechanical property.
The technical scheme adopted by the invention is a preparation method of a high-strength and high-permeability metal filter bag cylinder body, which is implemented according to the following steps:
step 1, selecting a proper metal fiber wire, cutting or drawing the metal fiber wire, and then cleaning to obtain a uniform metal fiber wire for later use;
step 2, paving the metal fiber wires by adopting a felt paving machine to obtain a fiber net for later use;
step 3, selecting a proper metal wire mesh, and uniformly cutting;
and 5, processing the sintered fiber mesh-metal wire mesh into a filter bag cylinder in a welding mode, and cutting to obtain the high-strength and high-permeability metal filter bag cylinder.
The invention is also characterized in that:
in the step 1, the diameter of the metal fiber wire is 2-100 μm.
In the step 2, the basis weight of the fiber web is 100-1500 g/m2。
In step 3, the mesh number of the metal wire mesh is 8-325 meshes.
In the step 4, the temperature of the vacuum high-temperature sintering treatment is 850-1400 ℃, the sintering time is 10-48 h, and the vacuum degree is 1 multiplied by 10-3～9×10-1Pa。
In the step 5, the filtering precision of the high-strength and high-permeability metal filter bag cylinder is 0.5-100 mu m.
The metal fiber wires and the metal wire nets are made of stainless steel, iron-chromium-aluminum alloy or nickel-based alloy.
The felt paving machine is an airflow felt paving machine, a vibration felt paving machine, a self-spraying felt paving machine or a carding felt paving machine.
In step 4, one side of the fiber net is overlapped with the metal wire net, and the top and the bottom of the other side of the fiber net are respectively overlapped with the metal wire net.
In step 4, the size of the ceramic cloth interlayer far away from the fiber net is not smaller than that of the fiber net.
The invention has the beneficial effects that:
according to the preparation method of the high-strength and high-permeability metal filter bag cylinder, the prepared filter bag cylinder is high in strength and good in stability, the performance of a welding area between two sections of filter bag cylinders is good, and a mechanical property weak area is not easy to generate; according to the preparation method of the high-strength and high-permeability metal filter bag cylinder, the prepared filter bag cylinder is easy to weld with a compact part, the performance of a welding area is good, a mechanical property weak area is not easy to generate, and the service life is longer; according to the preparation method of the high-strength and high-permeability metal filter bag barrel, the prepared filter bag barrel is better in permeability than the existing filter bag barrel without being covered with the mesh and the filter bag barrel covered with the mesh, dust is easier to remove, nearly half of the cost of the metal wire mesh can be saved, and the preparation method has high practicability;
according to the preparation method of the high-strength and high-permeability metal filter bag cylinder, only the local double-coating metal wire mesh is adopted, so that the sintering temperature is lower, the pressurization is smaller, and the heat preservation time is shorter; the fiber layer in the local double-metal-wire-mesh-covered area and the metal wire mesh layer form a welding node, and the metal wire mesh layer is welded with the flange compact part to form a firm welding area; the two ceramic cloth interlayers ensure the flatness of the filter material, so that the filter material is integrally firm and reliable and is not easy to deform in the sintering process.
Drawings
FIG. 1 is an SEM image of the base filter material and its welded area of a high strength and high permeability metal filter bag cartridge prepared in example 5 of the present invention;
FIG. 2 is an SEM image of the base filter of the metal filter bag cylinder and its welded area prepared in comparative example 1;
FIG. 3 is a first embodiment of a high strength gas permeable metal filter bag cartridge of the present invention;
FIG. 4 shows a second and a fifth embodiments of the high strength air permeable metal filter bag cartridge of the present invention;
FIG. 5 shows a third embodiment of the high strength gas permeable metal filter bag cartridge of the present invention;
FIG. 6 shows a fourth embodiment of the high strength gas permeable metal filter bag cartridge of the present invention;
FIG. 7 is a cross-sectional view of a high strength gas permeable metal filter bag cartridge of the present invention;
FIG. 8 is a schematic view of a filter bag cartridge of metal of comparative example 1.
In the figure, 1, a filter bag cylinder, 2, metal wire meshes a and 3, a flange, 4, a bottom cover, 5, a connecting ring, 6, metal wire meshes b and 7, and metal wire meshes c are arranged.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a preparation method of a high-strength and high-permeability metal filter bag cylinder, which is implemented according to the following steps:
step 1, selecting a proper metal fiber wire, cutting or drawing the metal fiber wire, and then cleaning to obtain a uniform metal fiber wire for later use; wherein the diameter of the metal fiber wire is 2-100 μm;
step 2, paving the metal fiber wires by adopting a felt paving machine to obtain a fiber net for later use;
wherein the basis weight of the fiber web is 100-1500 g/m2(ii) a The felt paving machine is an airflow felt paving machine, a vibration felt paving machine, a self-spraying felt paving machine or a carding felt paving machine; the paving speed is 0.2-5 m/min;
step 3, selecting a proper metal wire mesh, and uniformly cutting;
wherein the mesh number of the metal wire mesh is 8-325 meshes;
wherein one side of the fiber net is overlapped with the metal wire net, and the top and the bottom of the other side are respectively overlapped with the metal wire net, as shown in fig. 7; the temperature of the vacuum high-temperature sintering treatment is 850-1400 ℃, the sintering time is 10-48 h, and the vacuum degree is 1 multiplied by 10-3～9×10-1Pa; the metal fiber wires and the metal wire nets are made of stainless steel, iron-chromium-aluminum alloy or nickel-based alloy; ceramic cloth interlayer ruler far away from fiber netThe dimensions are not less than the dimensions of the web;
step 5, processing the sintered fiber mesh-metal wire mesh into a filter bag cylinder in a welding mode, and cutting to obtain a high-strength high-permeability metal filter bag cylinder;
wherein the filtering precision of the high-strength and high-permeability metal filter bag cylinder is 0.5-100 mu m.
Example 1
The invention relates to a preparation method of a high-strength and high-permeability metal filter bag cylinder, which is implemented according to the following steps:
step 1, selecting a proper metal fiber wire, cutting or drawing the metal fiber wire, and then cleaning to obtain a uniform metal fiber wire for later use; wherein the diameter of the metal fiber wire is 2 μm and 12 μm;
step 2, paving the two metal fiber yarns in the step 1 by adopting an airflow felt paving machine to obtain two layers of fiber nets for later use;
wherein the single weights of the two fiber webs are both 100g/m2(ii) a The paving speed is 0.2-5 m/min;
step 3, selecting a proper metal wire mesh, and uniformly cutting;
wherein, the mesh number of the metal wire mesh is 325 meshes;
wherein, one side of the fiber net is overlapped with the metal wire net, and the top and the bottom of the other side are respectively overlapped with the metal wire net; the temperature of the vacuum high-temperature sintering treatment is 850 ℃, the sintering time is 10h, and the vacuum degree is 1 multiplied by 10-3Pa; the metal fiber wires and the metal wire nets are made of stainless steel; the size of the ceramic cloth interlayer far away from the fiber net is not smaller than that of the fiber net;
step 5, processing the sintered fiber mesh-metal wire mesh into a filter bag cylinder in a welding mode, and cutting to obtain a high-strength high-permeability metal filter bag cylinder;
wherein the filtering precision of the high-strength and high-permeability metal filter bag cylinder body is 0.5 mu m.
The structure is shown in fig. 3, a wire mesh a2 is arranged on the inner side of the filter bag cylinder 1, wire meshes b6 are arranged on the top and the bottom of the outer side of the filter bag cylinder 1, a flange 3 is arranged at one end of the filter bag cylinder 1, and a bottom cover 4 is arranged at the other end of the filter bag cylinder 1; two ends of the wire mesh a2 are respectively welded on the flange 3 and the bottom cover 4; one end of the wire mesh b6 positioned at the top of the filter bag cylinder 1 is welded on the flange 3; one end of the wire mesh b6 at the bottom of the filter bag cylinder 1 is welded on the bottom cover 4.
Sleeving the filter bag cylinder 1 on the bag cage framework, and then respectively welding two ends of the bag cage framework on the flange 3 and the bottom cover 4 to obtain the first metal filter bag.
Example 2
The invention relates to a preparation method of a high-strength and high-permeability metal filter bag cylinder, which is implemented according to the following steps:
step 1, selecting a proper metal fiber wire, cutting or drawing the metal fiber wire, and then cleaning to obtain a uniform metal fiber wire for later use; wherein the diameter of the metal fiber wire is 22 μm, 50 μm and 100 μm;
step 2, paving the three metal fiber wires in the step 1 by adopting a vibrating felt paving machine to obtain three layers of fiber nets for later use;
wherein the fiber net with the filament diameters of 22 μm, 50 μm and 100 μm has a single weight of 500g/m2、600g/m2And 400g/m2(ii) a The paving speed is 0.2-5 m/min;
step 3, selecting a proper metal wire mesh, and uniformly cutting;
wherein the mesh number of the metal wire mesh is 8 meshes;
wherein, one side of the fiber net is overlapped with the metal wire net, and the top and the bottom of the other side are respectively overlapped with the metal wire net; the temperature of the vacuum high-temperature sintering treatment is 1400 ℃, and the sintering time is48h, vacuum degree of 9X 10-1Pa; the metal fiber wires and the metal wire nets are made of iron-chromium-aluminum alloy; the size of the ceramic cloth interlayer far away from the fiber net is not smaller than that of the fiber net;
step 5, processing the sintered fiber mesh-metal wire mesh into a filter bag cylinder in a welding mode, and cutting to obtain a high-strength high-permeability metal filter bag cylinder;
wherein the filtering precision of the high-strength and high-permeability metal filter bag cylinder body is 100 mu m.
The structure is shown in fig. 4, a wire mesh a2 is arranged on the inner side of the filter bag cylinder 1, wire meshes b6 are arranged on the top and the bottom of the outer side of the filter bag cylinder 1, a flange 3 is arranged at one end of the filter bag cylinder 1, and a bottom cover 4 is arranged at the other end of the filter bag cylinder 1; two ends of the wire mesh a2 are respectively welded on the flange 3 and the bottom cover 4; one end of the wire mesh b6 positioned at the top of the filter bag cylinder 1 is welded on the flange 3; one end of the wire mesh b6 positioned at the bottom of the filter bag cylinder 1 is welded on the bottom cover 4; and a wire mesh c7 is arranged at the axial welding seam of the filter bag cylinder body 1, and two ends of the wire mesh c7 are respectively welded on the flange 3 and the bottom cover 4.
And sleeving the filter bag cylinder 1 on the bag cage framework, and then respectively welding two ends of the bag cage framework on the flange 3 and the bottom cover 4 to obtain a second metal filter bag.
Example 3
The invention relates to a preparation method of a high-strength and high-permeability metal filter bag cylinder, which is implemented according to the following steps:
step 1, selecting a proper metal fiber wire, cutting or drawing the metal fiber wire, and then cleaning to obtain a uniform metal fiber wire for later use; wherein the diameter of the metal fiber wire is 2 μm and 12 μm;
step 2, paving the two metal fiber yarns in the step 1 by adopting an airflow felt paving machine to obtain two layers of fiber nets for later use;
wherein the fiber webs with the filament diameters of 2 μm and 12 μm have the basis weights of 100g/m2(ii) a The paving speed is 0.2-5 m/min;
step 3, selecting a proper metal wire mesh, and uniformly cutting;
wherein, the mesh number of the metal wire mesh is 325 meshes;
wherein, one side of the fiber net is overlapped with the metal wire net, and the top and the bottom of the other side are respectively overlapped with the metal wire net; the temperature of the vacuum high-temperature sintering treatment is 850 ℃, the sintering time is 10h, and the vacuum degree is 1 multiplied by 10-3Pa; the metal fiber wires and the metal wire nets are made of stainless steel; the size of the ceramic cloth interlayer far away from the fiber net is not smaller than that of the fiber net;
step 5, processing the sintered fiber mesh-metal wire mesh into a filter bag cylinder in a welding mode, and cutting to obtain a high-strength high-permeability metal filter bag cylinder;
wherein the filtering precision of the high-strength and high-permeability metal filter bag cylinder body is 0.5 mu m.
The structure is shown in fig. 5, N filter bag cylinders 1 are selected, the inner sides of the N filter bag cylinders 1 are all provided with a wire mesh a2, two adjacent filter bag cylinders 1 are fixedly connected through a connecting ring 5, the connecting ring 5 is of a metal structure, and two ends of the outer sides of the N filter bag cylinders 1 are all provided with a wire mesh b 6; the end part of the filter bag cylinder body 1 at the top is provided with a flange 3, and the end part of the filter bag cylinder body 1 at the bottom is provided with a bottom cover 4; one end of the wire mesh a2 in the filter bag cylinder 1 at the top is welded on the flange 3, and one end of the wire mesh a2 in the filter bag cylinder 1 at the bottom is welded on the bottom cover 4; one end of the wire mesh b6 at the end part of the filter bag cylinder body 1 close to the top is welded on the flange 3; the wire mesh b6 at the end of the filter bag cylinder 1 near the bottom is welded at one end to the bottom cover 4.
And sleeving N filter bag cylinders 1 on the bag cage frameworks, and then respectively welding the end parts of the bag cage frameworks at the top and the bottom to a flange 3 and a bottom cover 4 to obtain a third metal filter bag.
Example 4
The invention relates to a preparation method of a high-strength and high-permeability metal filter bag cylinder, which is implemented according to the following steps:
step 1, selecting a proper metal fiber wire, cutting or drawing the metal fiber wire, and then cleaning to obtain a uniform metal fiber wire for later use; wherein the diameter of the metal fiber wire is 22 μm, 50 μm and 100 μm;
step 2, respectively paving the three metal fiber yarns in the step 1 by adopting a self-spraying or carding felt paving machine to obtain three layers of fiber nets for later use;
wherein the fiber net with the filament diameters of 22 μm, 50 μm and 100 μm has a single weight of 500g/m2、600g/m2And 400g/m2(ii) a The paving speed is 0.2-5 m/min;
step 3, selecting a proper metal wire mesh, and uniformly cutting;
wherein the mesh number of the metal wire mesh is 8 meshes;
wherein, one side of the fiber net is overlapped with the metal wire net, and the top and the bottom of the other side are respectively overlapped with the metal wire net; the temperature of the vacuum high-temperature sintering treatment is 1400 ℃, the sintering time is 48h, and the vacuum degree is 9 multiplied by 10-1Pa; the metal fiber wires and the metal wire nets are made of nickel-based alloy; the size of the ceramic cloth interlayer far away from the fiber net is not smaller than that of the fiber net;
step 5, processing the sintered fiber mesh-metal wire mesh into a filter bag cylinder in a welding mode, and cutting to obtain a high-strength high-permeability metal filter bag cylinder;
wherein the filtering precision of the high-strength and high-permeability metal filter bag cylinder body is 100 mu m.
The structure is shown in fig. 6, N filter bag cylinders 1 are selected, the inner sides of the N filter bag cylinders 1 are all provided with a wire mesh a2, two adjacent filter bag cylinders 1 are fixedly connected through a connecting ring 5, the connecting ring 5 is of a metal structure, and two ends of the outer sides of the N filter bag cylinders 1 are all provided with a wire mesh b 6; the N filter bag cylinders 1 comprise a filter bag cylinder 1 at the top and a filter bag cylinder 1 at the bottom, a flange 3 is arranged at the end part of the filter bag cylinder 1 at the top, and a bottom cover 4 is arranged at the end part of the filter bag cylinder 1 at the bottom; one end of the wire mesh a2 in the filter bag cylinder 1 at the top is welded on the flange 3, and one end of the wire mesh a2 in the filter bag cylinder 1 at the bottom is welded on the bottom cover 4; one end of the wire mesh b6 at the end part of the filter bag cylinder body 1 close to the top is welded on the flange 3; one end of the wire mesh b6 at the end part of the filter bag cylinder body 1 close to the bottom is welded on the bottom cover 4; the axial weld joints of the N filter bag cylinders 1 are all provided with a metal wire mesh c7, one end of the metal wire mesh c7 on the filter bag cylinder 1 at the top is welded on the flange 3, and one end of the metal wire mesh c7 on the filter bag cylinder 1 at the bottom is welded on the bottom cover 4.
Sleeving N filter bag cylinders 1 on the bag cage frameworks, and then respectively welding the end parts of the bag cage frameworks at the top and the bottom to a flange 3 and a bottom cover 4 to obtain a fourth metal filter bag.
Example 5
The invention relates to a preparation method of a high-strength and high-permeability metal filter bag cylinder, which is implemented according to the following steps:
step 1, selecting a proper metal fiber wire, cutting or drawing the metal fiber wire, and then cleaning to obtain a uniform metal fiber wire for later use; wherein the diameter of the metal fiber wire is 4 μm and 25 μm;
step 2, paving the two metal fiber yarns in the step 1 by adopting an airflow felt paving machine to obtain two layers of fiber nets for later use;
wherein the fiber net with 4 μm and 25 μm filament diameter has a single weight of 600g/m2And 400g/m2(ii) a The paving speed is 0.2-5 m/min;
step 3, selecting a proper metal wire mesh, and uniformly cutting;
wherein the mesh number of the metal wire mesh is 48 meshes;
wherein, one side of the fiber net is overlapped with the metal wire net, and the top and the bottom of the other side are respectively overlapped with the metal wire net; the temperature of the vacuum high-temperature sintering treatment is 1200 ℃, the sintering time is 24h, and the vacuum degree is5.6×10-1Pa; the metal fiber wires and the metal wire nets are made of stainless steel; the size of the ceramic cloth interlayer far away from the fiber net is not smaller than that of the fiber net;
step 5, processing the sintered fiber mesh-metal wire mesh into a filter bag cylinder in a welding mode, and cutting to obtain a high-strength high-permeability metal filter bag cylinder;
wherein the filtering precision of the high-strength and high-permeability metal filter bag cylinder body is 10 mu m.
The structure is shown in fig. 4, a wire mesh a2 is arranged on the inner side of the filter bag cylinder 1, wire meshes b6 are arranged on the top and the bottom of the outer side of the filter bag cylinder 1, a flange 3 is arranged at one end of the filter bag cylinder 1, and a bottom cover 4 is arranged at the other end of the filter bag cylinder 1; two ends of the wire mesh a2 are respectively welded on the flange 3 and the bottom cover 4; one end of the wire mesh b6 positioned at the top of the filter bag cylinder 1 is welded on the flange 3; one end of the wire mesh b6 positioned at the bottom of the filter bag cylinder 1 is welded on the bottom cover 4; and a wire mesh c7 is arranged at the axial welding seam of the filter bag cylinder body 1, and two ends of the wire mesh c7 are respectively welded on the flange 3 and the bottom cover 4.
Comparative example 1
The invention relates to a preparation method of a high-strength and high-permeability metal filter bag cylinder, which is implemented according to the following steps:
step 1, selecting a proper metal fiber wire, cutting or drawing the metal fiber wire, and then cleaning to obtain a uniform metal fiber wire for later use; wherein the diameter of the metal fiber wire is 4 μm and 25 μm;
step 2, paving the two metal fiber yarns in the step 1 by adopting an airflow felt paving machine to obtain two layers of fiber nets for later use;
wherein the fiber net with 4 μm and 25 μm filament diameter has a single weight of 600g/m2And 400g/m2(ii) a The paving speed is 0.2-5 m/min;
step 3, overlapping the two fiber nets, covering a ceramic cloth interlayer on the surfaces of the two fiber nets, then sending the two fiber nets into a high-temperature vacuum furnace for vacuum high-temperature sintering treatment, and taking out the two fiber nets after cooling to obtain sintered fiber nets for later use;
wherein the temperature of the vacuum high-temperature sintering treatment is 1200 ℃, the sintering time is 24h, and the vacuum degree is5.6×10-1Pa; the metal fiber wires are made of stainless steel;
and 4, processing the sintered fiber mesh into a filter bag cylinder in a welding mode, and cutting to obtain the metal filter bag cylinder. Wherein the filtering precision of the high-strength and high-permeability metal filter bag cylinder body is 10 mu m.
The structure is shown in fig. 8, one end of the filter bag cylinder body 1 is provided with a flange 3, and the other end is provided with a bottom cover 4.
And (3) experimental verification:
the scanning electron microscope of the substrate filter material of the high-strength and high-permeability metal filter bag cylinder prepared in example 5 and the welding area thereof is shown in fig. 1, and it can be seen from fig. 1 that the welding area is firm and has no surface defects.
The scanning electron microscope of the base filter material of the metal filter bag cylinder prepared in the comparative example 1 and the welding area thereof is shown in fig. 2, and it can be seen from fig. 2 that the welding leakage phenomenon occurs in the welding area.
When the filter material covered with the wire mesh is welded, the wire mesh is in lap joint with the wire mesh, and the millimeter-scale wire diameter of the filter material can ensure that the welding area can be fully diffused in the heat preservation process before excessive liquid phase quantity is generated, so that a firm welding seam is obtained.
When the filter material which is not covered with the wire mesh is welded, if the heat preservation time is too short, the welding is not sufficient, and the welding seam is not firm enough; if the heat preservation time is too long, the micron-sized wire diameter is easy to generate excessive liquid phase quantity, and the existence time of a molten pool is too long, the phenomenon of solder loss in a welding area can be caused, holes are generated in a welding line finally, and the strength of the welding position is greatly reduced.
The base filter materials of the metal filter bag cylinders prepared in the example 5 and the comparative example 1 were respectively subjected to a strength test, and the samples of the metal filter bag cylinders prepared in the example 5 and the comparative example 1 had a length of 10cm, a width of 2cm and a thickness of 0.5 mm. The test results are: the strength of the base filter of example 2 was 322N/(1 × 10cm), and the strength of the base filter of comparative example 1 was 132N/(1 × 10 cm).
It can be derived that: the strength of the high-strength and high-permeability metal filter bag cylinder prepared by the method is higher than that of the metal filter bag cylinder prepared by the traditional process; according to the invention, the fiber mesh and the metal wire mesh are overlapped and sintered, and the metal wire mesh plays a good supporting role, so that the overall strength of the metal filter bag substrate is ensured.
Claims (10)
1. The preparation method of the high-strength and high-permeability metal filter bag cylinder is characterized by comprising the following steps:
step 1, selecting a proper metal fiber wire, cutting or drawing the metal fiber wire, and then cleaning to obtain a uniform metal fiber wire for later use;
step 2, paving the metal fiber wires by adopting a felt paving machine to obtain a fiber net for later use;
step 3, selecting a proper metal wire mesh, and uniformly cutting;
step 4, overlapping at least one layer of fiber mesh and the metal wire mesh, covering a ceramic cloth interlayer on the upper surface and the lower surface of the fiber mesh and the metal wire mesh, then sending the fiber mesh and the metal wire mesh into a high-temperature vacuum furnace for vacuum high-temperature sintering treatment, and taking out the fiber mesh and the metal wire mesh after cooling to obtain the fiber mesh and the metal wire mesh for later use;
and 5, processing the sintered fiber mesh-metal wire mesh into a filter bag cylinder in a welding mode, and cutting to obtain the high-strength and high-permeability metal filter bag cylinder.
2. The method for preparing the high-strength and high-permeability metal filter bag cylinder according to claim 1, wherein in the step 1, the diameter of the metal fiber wires is 2-100 μm.
3. The method for preparing the high-strength and high-permeability metal filter bag cylinder according to claim 1, wherein in the step 2, the basis weight of the fiber web is 100-1500 g/m2。
4. The method for preparing the high-strength and high-permeability metal filter bag cylinder according to claim 1, wherein in the step 3, the mesh number of the metal wire mesh is 8-325 meshes.
5. The method of claim 1The preparation method of the high-strength and high-permeability metal filter bag cylinder is characterized in that in the step 4, the temperature of the vacuum high-temperature sintering treatment is 850-1400 ℃, the sintering time is 10-48 h, and the vacuum degree is 1 multiplied by 10-3～9×10-1Pa。
6. The method for manufacturing the high-strength high-permeability metal filter bag cylinder according to claim 1, wherein in the step 5, the filtration precision of the high-strength high-permeability metal filter bag cylinder is 0.5-100 μm.
7. The method for manufacturing the high-strength and high-permeability metal filter bag cylinder according to claim 1, wherein the metal fiber wires and the metal wire nets are made of stainless steel, iron-chromium-aluminum alloy or nickel-based alloy.
8. The method for preparing the high-strength and high-permeability metal filter bag cylinder according to claim 1, wherein the felt spreading machine is an air felt spreading machine, a vibration felt spreading machine, a self-spraying felt spreading machine or a carding felt spreading machine.
9. The method for manufacturing a high-strength and high-permeability metal filter bag cylinder according to claim 1, wherein in the step 4, one side of the fiber net is overlapped with the metal wire net, and the top and the bottom of the other side of the fiber net are respectively overlapped with the metal wire net.
10. The method for manufacturing the high-strength and high-permeability metal filter bag cylinder according to claim 9, wherein in the step 4, the size of the ceramic cloth barrier layer far away from the fiber web is not smaller than the size of the fiber web.
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