CN112807857A - Waste gas treatment purifier and preparation method of filter element thereof - Google Patents
Waste gas treatment purifier and preparation method of filter element thereof Download PDFInfo
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- CN112807857A CN112807857A CN202110160085.XA CN202110160085A CN112807857A CN 112807857 A CN112807857 A CN 112807857A CN 202110160085 A CN202110160085 A CN 202110160085A CN 112807857 A CN112807857 A CN 112807857A
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- 239000002912 waste gas Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 239000000956 alloy Substances 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 36
- 239000007789 gas Substances 0.000 claims abstract description 21
- 238000002844 melting Methods 0.000 claims abstract description 15
- 230000008018 melting Effects 0.000 claims abstract description 15
- 230000003647 oxidation Effects 0.000 claims abstract description 13
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 13
- 230000001174 ascending effect Effects 0.000 claims abstract description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 38
- 239000002245 particle Substances 0.000 claims description 38
- 229910052782 aluminium Inorganic materials 0.000 claims description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 15
- 239000011651 chromium Substances 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000010146 3D printing Methods 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 230000003197 catalytic effect Effects 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 230000007704 transition Effects 0.000 claims description 4
- 229910000599 Cr alloy Inorganic materials 0.000 claims description 3
- 239000000788 chromium alloy Substances 0.000 claims description 3
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims description 2
- 239000002440 industrial waste Substances 0.000 abstract description 4
- 239000010791 domestic waste Substances 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 22
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 10
- 229910052804 chromium Inorganic materials 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 7
- 238000007639 printing Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000003892 spreading Methods 0.000 description 3
- 230000007480 spreading Effects 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 229910001325 element alloy Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N chromium trioxide Inorganic materials O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 125000001997 phenyl group Chemical class [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- -1 printing Substances 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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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
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
-
- 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
- B01D46/0001—Making filtering elements
-
- 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
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y10/00—Processes of additive manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Filtering Materials (AREA)
- Catalysts (AREA)
Abstract
A waste gas treatment purifier and a preparation method of a filter element thereof comprise a shell and a filter element arranged in the shell; the filter element is internally provided with a honeycomb type through hole which is a spiral ascending type through hole. The filter element is manufactured by adopting a selective laser melting method. The filter element with the spiral polygonal through hole honeycomb structure can greatly improve the specific surface area, remarkably reduce the volume of the filter and improve the waste gas treatment efficiency. In addition, compared with the traditional filter element, the Al element content of the alloy material is obviously improved, so that the high-temperature resistance, the oxidation resistance and other properties of the filter are effectively improved, and the service life of the filter is prolonged; the method can prepare a complex microstructure, thereby improving the waste gas filtering effect; the waste gas covers various aspects of automobile tail gas, industrial waste gas, domestic waste gas and the like, and the application range of the waste gas is greatly expanded.
Description
Technical Field
The invention relates to the technical field of waste gas purification equipment, in particular to a waste gas treatment purifier with a spiral-type rising through hole honeycomb structure wall of a filter element and a preparation method of the filter element.
Technical Field
Along with the progress of industrialization in China, the industries such as electronics, plastics, printing, building materials, chemical engineering, automobiles and the like are rapidly developed, and organic pollutants discharged into the atmospheric environment in the production process of enterprises in the industries comprise aromatic compounds such as benzene series, aldehydes and ketones, halogenated hydrocarbons, alcohols and the like. Meanwhile, the rapid increase of the automobile holding capacity in China causes a large amount of harmful tail gas (hydrocarbon, carbon monoxide, nitrogen oxide and the like) to enter the atmosphere, so that the pollution to the atmosphere is serious, and the health of people is greatly harmed. Therefore, the treatment of industrial waste gas and automobile exhaust gas is an urgent task at present.
The waste gas purifier can effectively treat various industrial and domestic waste gases and automobile exhaust, and the filter element is an important component of the purifier. The material required for preparing the catalyst carrier has high thermal stability and mechanical strength, high specific surface area, small expansion coefficient and the like. The traditional process for preparing the metal carrier is complex and high in cost, only the straight-through hole honeycomb filter element can be prepared, and the specific surface area is small, so that the catalytic efficiency of the coating is low.
Disclosure of Invention
In view of the above, the present invention provides an exhaust gas treatment purifier with a spiral type polygonal through hole honeycomb filter element, an alloy material system for preparing the spiral type through hole honeycomb filter element, and a preparation method for 3D printing.
The technical scheme of the invention is as follows:
the waste gas treatment purifier is characterized by comprising a shell and a filter element arranged in the shell; the filter element is internally provided with a honeycomb type through hole which is a spiral ascending type through hole.
Further, the horizontal cross section of the honeycomb through hole includes at least one of the following shapes: triangle, square and N-edge, wherein N is more than or equal to 5.
Further, the horizontal cross section of the honeycomb through hole includes at least one of the following shapes: triangle, square, pentagon, hexagon.
Furthermore, the spiral angle of the honeycomb through hole is 0-n 360 degrees, wherein n is more than or equal to 1.
Furthermore, the spiral angle of the honeycomb through hole is 5-n 360 degrees, wherein n is more than or equal to 1.
Further, the shell is including connecting gradually portion of admitting air, portion of holding, the portion of giving vent to anger, the filter core sets up in the portion of holding.
Furthermore, the containing part bilateral symmetry is equipped with first buffer, second buffer, first buffer is connected with the portion of admitting air, the second buffer is connected with the portion of giving vent to anger.
Furthermore, the horizontal section of the first buffer area is trapezoidal, and the horizontal section of the second buffer area is trapezoidal.
Further, the gradient of the first buffer area is larger than that of the second buffer area.
Furthermore, the filter element is an iron-chromium alloy filter element with high aluminum content. Wherein, the content of Al element is 5-40 wt.%, the content of Cr is 10-40 wt.%, and the rest is Fe.
The invention also provides a preparation method of the waste gas treatment purifier filter element, which is characterized by comprising the following steps:
s1, creating a three-dimensional model of a filter element by using three-dimensional modeling software;
s2, slicing the three-dimensional model of the filter element by adopting slicing software so as to control the scanning track of the laser beam; adopting Ar, N2 or mixed gas of Ar + N2 as protective atmosphere;
s3, paving alloy particles, and then obtaining a current layer by adopting a laser melting 3D printing method;
and S4, repeating the step S3 on the current layer for multiple times until a preset filter element entity with an optimized structure is obtained.
In the invention, the filter element is manufactured by adopting a Selective Laser Melting (SLM) method.
Further, the thickness of the powder spread in the step S3 is 20-300 microns.
Further, the power of the laser beam in the step S3 is 100-.
Further, the laser beam spot size in step S3 is 30-70 μm.
Further, the pitch of laser scanning in the step S3 is 0.005-0.07 mm; the scanning speed is 50-5000 mm/s.
After the filter element is printed and prepared by the SLM, the printed filter element is subjected to post-printing heat treatment, and the heat treatment process comprises annealing treatment in a protective atmosphere of 200-1200 ℃, so that the residual stress of the filter element printing piece is reduced, and the structural stability of the filter element printing piece is improved.
After the filter element is prepared by SLM printing, before or after heat treatment, a pre-oxidation transition layer is prepared on the surface of the filter element; the catalytic coating process is carried out on the basis of the pre-oxidation transition layer, and mainly comprises a noble metal coating such as platinum (Pt), rhodium (Rh), palladium (Pd)) and the like, and Ni/NiO, Cu/CuO-CrO3And the like.
According to the invention, the SLM3D printing process is adopted, so that the rolling process required in the traditional filter element alloy preparation is successfully bypassed, and the formed spiral polygonal through hole can be directly prepared, so that the Al content in the filter element alloy material can be increased to 40 wt.%, and the high temperature resistance, the oxidation resistance and the specific surface area of the filter are obviously improved.
The alloy material of the structure-optimized filter element breaks through the limitation of the content of Al element (less than or equal to 5 wt.%) in the traditional filter element material, improves the content of Al element to 40 wt.%, and obviously improves the high-temperature oxidation resistance of a filter device; the invention breaks through the defect that the honeycomb structure of the current exhaust gas purification or the exhaust gas purifier of the automobile and the diesel engine only has straight through holes without spiral design, and provides the spiral design for the honeycomb structure, thereby effectively improving the performances of the filter, such as specific surface area, filtering efficiency and the like; the invention provides a method for preparing a waste gas purification device with spiral through holes by adopting 3D printing modes such as SLM and the like, and breaks through the limitation that a complex through hole filter device cannot be prepared by the traditional preparation method.
Compared with the prior art, the filter element with the spiral polygonal through hole honeycomb structure can greatly improve the specific surface area, remarkably reduce the volume of the filter and improve the waste gas treatment efficiency. In addition, compared with the traditional filter element, the Al element content of the alloy material is obviously improved, so that the high-temperature resistance, the oxidation resistance and other performances of the filter are effectively improved, and the service life of the filter is prolonged.
The invention provides a selective laser melting additive manufacturing method for preparing a filter element with a spiral polygonal through hole honeycomb structure wall, which can prepare a complex microstructure so as to improve the waste gas filtering effect; the waste gas covers various aspects of automobile tail gas, industrial waste gas, domestic waste gas and the like, and the application range of the waste gas is greatly expanded.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a filter element according to the present invention;
FIG. 3 is a partial cross-sectional view of a filter cartridge according to the present invention;
fig. 4 is a partial cross-sectional view of a cartridge of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
The waste gas treatment purifier is characterized by comprising a shell 1 and a filter element 2 arranged in the shell; be equipped with honeycomb formula through-hole 21 in the filter core, the honeycomb formula through-hole is spiral formula through-hole that rises.
Further, the horizontal cross section of the honeycomb through hole includes at least one of the following shapes: triangle, square and N-edge, wherein N is more than or equal to 5.
Further, the horizontal cross section of the honeycomb through hole includes at least one of the following shapes: triangle, square, pentagon, hexagon.
Furthermore, the spiral angle of the honeycomb through hole is 0-n 360 degrees, wherein n is more than or equal to 1.
Furthermore, the spiral angle of the honeycomb through hole is 5-n 360 degrees, wherein n is more than or equal to 1.
Further, the shell includes that connect gradually portion 11, the portion of holding 12, the portion of giving vent to anger 13 of admitting air, the filter core sets up in the portion of holding.
Further, a first buffer area 121 and a second buffer area 122 are symmetrically arranged on two sides of the accommodating portion, the first buffer area is connected with the air inlet portion, and the second buffer area is connected with the air outlet portion.
Furthermore, the horizontal section of the first buffer area is trapezoidal, and the horizontal section of the second buffer area is trapezoidal.
Further, the gradient of the first buffer area is larger than that of the second buffer area.
Furthermore, the filter element is an iron-chromium alloy filter element with high aluminum content. Wherein, the content of Al element is 5-40 wt.%, the content of Cr is 10-40 wt.%, and the rest is Fe.
Example 2
A preparation method of a waste gas treatment purifier filter element comprises the steps of mixing and melting iron, chromium and aluminum in a mass ratio of 60:20:20, atomizing and granulating to obtain spherical or nearly spherical Fe-20Cr-20Al alloy particles of 20-50 microns. The method comprises the following steps:
a) utilizing three-dimensional modeling software to establish a three-dimensional model of a spiral through hole honeycomb structure filter element with a triangular section, wherein the spiral angle of a hole is 5 degrees;
b) adopting 'slicing' software to carry out 'slicing' treatment on the three-dimensional model of the filter element, thereby controlling the scanning track of the laser beam;
c) flatly paving Fe-20Cr-10Al alloy particles to form a current layer, wherein the powder paving thickness is 50 microns;
d) scanning the current layer by using a 100W laser beam, wherein the scanning interval is 0.06mm, and the scanning speed is 900mm/s, so that the alloy particles are sintered to obtain the current layer;
e) and c) paving spherical or nearly spherical alloy particles on the current layer again, and repeating the operation process of the step c) d) until a preset structure-optimized filter element entity is obtained.
Example 3
A preparation method of a waste gas treatment purifier filter element comprises the steps of mixing and melting iron, chromium and aluminum in a mass ratio of 60:20:20, atomizing and granulating to obtain spherical or nearly spherical Fe-20Cr-20Al alloy particles of 20-50 microns. The method comprises the following steps:
a) utilizing three-dimensional modeling software to establish a three-dimensional model of a spiral through hole honeycomb structure filter element with a triangular section, wherein the spiral angle of a hole is 60 degrees;
b) adopting 'slicing' software to carry out 'slicing' treatment on the three-dimensional model of the filter element, thereby controlling the scanning track of the laser beam;
c) flatly paving Fe-20Cr-20Al alloy particles to form a current layer, wherein the powder paving thickness is 50 microns;
d) scanning the current layer by using a 100W laser beam, wherein the scanning interval is 0.06mm, and the scanning speed is 900mm/s, so that the alloy particles are melted and sintered to obtain the current layer;
e) and c) paving spherical or nearly spherical alloy particles on the current layer again, and repeating the operation process of the step c) d) until a preset structure-optimized filter element entity is obtained.
Example 4
A preparation method of a waste gas treatment purifier filter element comprises the steps of mixing and melting iron, chromium and aluminum in a mass ratio of 60:20:20, atomizing and granulating to obtain spherical or nearly spherical Fe-20Cr-20Al alloy particles of 20-50 microns. The method comprises the following steps:
a) utilizing three-dimensional modeling software to establish a three-dimensional model of a spiral through hole honeycomb structure filter element with a triangular section, wherein the spiral angle of a hole is 360 degrees;
b) adopting 'slicing' software to carry out 'slicing' treatment on the three-dimensional model of the filter element, thereby controlling the scanning track of the laser beam;
c) flatly paving Fe-20Cr-20Al alloy particles to form a current layer, wherein the powder paving thickness is 50 microns;
d) scanning the current layer by using a 100W laser beam, wherein the scanning interval is 0.06mm, and the scanning speed is 900mm/s, so that the alloy particles are melted and sintered to obtain the current layer;
e) and c) paving spherical or nearly spherical alloy particles on the current layer again, and repeating the operation process of the step c) d) until a preset structure-optimized filter element entity is obtained.
Example 5
A preparation method of a waste gas treatment purifier filter element comprises the steps of mixing and melting iron, chromium and aluminum in a mass ratio of 60:20:20, atomizing and granulating to obtain spherical or nearly spherical Fe-20Cr-20Al alloy particles of 20-50 microns. The method comprises the following steps:
a) utilizing three-dimensional modeling software to establish a three-dimensional model of a spiral through hole honeycomb structure filter element with a triangular section, wherein the spiral angle of a hole is 720 degrees;
b) adopting 'slicing' software to carry out 'slicing' treatment on the three-dimensional model of the filter element, thereby controlling the scanning track of the laser beam;
c) flatly paving Fe-20Cr-20Al alloy particles to form a current layer, wherein the powder paving thickness is 50 microns;
d) scanning the current layer by using a 100W laser beam, wherein the scanning interval is 0.06mm, and the scanning speed is 900mm/s, so that the alloy particles are melted and sintered to obtain the current layer;
e) and c) paving spherical or nearly spherical alloy particles on the current layer again, and repeating the operation process of the step c) d) until a preset structure-optimized filter element entity is obtained. As shown in fig. 2, fig. 2 is a schematic view of a filter element having a hexagonal spiral type through-hole honeycomb structure prepared in example 1 of the present invention.
Example 6
A preparation method of a waste gas treatment purifier filter element comprises the steps of mixing and melting iron, chromium and aluminum in a mass ratio of 75:20:5, atomizing and granulating to obtain spherical or nearly spherical Fe-20Cr-5Al alloy particles of 20-50 microns. The method comprises the following steps:
a) utilizing three-dimensional modeling software to establish a three-dimensional model of a spiral through hole honeycomb structure filter element with a triangular section, wherein the spiral angle of a hole is 360 degrees;
b) adopting 'slicing' software to carry out 'slicing' treatment on the three-dimensional model of the filter element, thereby controlling the scanning track of the laser beam;
c) flatly paving Fe-20Cr-5Al alloy particles to form a current layer, wherein the powder paving thickness is 50 microns;
d) scanning the current layer by using a 100W laser beam, wherein the scanning interval is 0.06mm, and the scanning speed is 900mm/s, so that the alloy particles are melted and sintered to obtain the current layer;
e) and c) paving spherical or nearly spherical alloy particles on the current layer again, and repeating the operation process of the step c) d) until a preset structure-optimized filter element entity is obtained. As shown in fig. 2, fig. 2 is a schematic view of a filter element having a hexagonal spiral type through-hole honeycomb structure prepared in example 1 of the present invention.
Example 7
A preparation method of a waste gas treatment purifier filter element comprises the steps of mixing and melting iron, chromium and aluminum in a mass ratio of 50:20:30, atomizing and granulating to obtain spherical or nearly spherical Fe-20Cr-30Al alloy particles of 20-50 microns. The method comprises the following steps:
a) utilizing three-dimensional modeling software to establish a three-dimensional model of a spiral through hole honeycomb structure filter element with a triangular section, wherein the spiral angle of a hole is 360 degrees;
b) adopting 'slicing' software to carry out 'slicing' treatment on the three-dimensional model of the filter element, thereby controlling the scanning track of the laser beam;
c) flatly paving Fe-20Cr-30Al alloy particles to form a current layer, wherein the powder paving thickness is 50 microns;
d) scanning the current layer by using a 100W laser beam, wherein the scanning interval is 0.06mm, and the scanning speed is 900mm/s, so that the alloy particles are melted and sintered to obtain the current layer;
e) and c) paving spherical or nearly spherical alloy particles on the current layer again, and repeating the operation process of the step c) d) until a preset structure-optimized filter element entity is obtained.
Comparative example 1
A preparation method of a waste gas treatment purifier filter element comprises the steps of mixing and melting iron, chromium and aluminum in a mass ratio of 75:20:5, atomizing and granulating to obtain spherical or nearly spherical Fe-20Cr-5Al alloy particles of 20-50 microns. The method comprises the following steps:
a) creating a three-dimensional model of the straight-through hole honeycomb structure filter element with a triangular section by using three-dimensional modeling software;
b) adopting 'slicing' software to carry out 'slicing' treatment on the three-dimensional model of the filter element, thereby controlling the scanning track of the laser beam;
c) flatly paving Fe-20Cr-5Al alloy particles to form a current layer, wherein the powder paving thickness is 50 microns;
d) scanning the current layer by adopting 100W laser beams, wherein the scanning interval is 0.06mm, and the scanning speed is 900mm/s, so that the alloy particles are sintered to obtain the printed current layer;
e) and c) spreading spherical or nearly spherical alloy particles on the printed current layer again, and repeating the operation process of the step c) d) until a hexagonal straight-through hole honeycomb filter element entity is obtained.
Comparative example 2
A preparation method of a waste gas treatment purifier filter element comprises the steps of mixing and melting iron, chromium and aluminum in a mass ratio of 60:20:20, atomizing and granulating to obtain spherical or nearly spherical Fe-20Cr-20Al alloy particles of 20-50 microns. The method comprises the following steps:
a) creating a three-dimensional model of the straight-through hole honeycomb structure filter element with a triangular section by using three-dimensional modeling software;
b) adopting 'slicing' software to carry out 'slicing' treatment on the three-dimensional model of the filter element, thereby controlling the scanning track of the laser beam;
c) flatly paving Fe-20Cr-5Al alloy particles to form a current layer, wherein the powder paving thickness is 50 microns;
d) scanning the current layer by using a 100W laser beam, wherein the scanning interval is 0.06mm, and the scanning speed is 900mm/s, so that the alloy particles are melted and sintered to obtain the current layer;
e) and c) spreading spherical or nearly spherical alloy particles on the current layer again, and repeating the operation process of the step c) d) until a hexagonal straight-through hole honeycomb filter element entity is obtained.
Comparative example 3
A preparation method of a waste gas treatment purifier filter element comprises the steps of mixing and melting iron, chromium and aluminum in a mass ratio of 50:20:30, atomizing and granulating to obtain spherical or nearly spherical Fe-20Cr-30Al alloy particles of 20-50 microns. The method comprises the following steps:
a) creating a three-dimensional model of the straight-through hole honeycomb structure filter element with a triangular section by using three-dimensional modeling software;
b) adopting 'slicing' software to carry out 'slicing' treatment on the three-dimensional model of the filter element, thereby controlling the scanning track of the laser beam;
c) flatly paving Fe-20Cr-30Al alloy particles to form a current layer, wherein the powder paving thickness is 50 microns;
d) scanning the current layer by using a 100W laser beam, wherein the scanning interval is 0.06mm, and the scanning speed is 900mm/s, so that the alloy particles are melted and sintered to obtain the current layer;
e) and c) spreading spherical or nearly spherical alloy particles on the current layer again, and repeating the operation process of the step c) d) until a hexagonal straight-through hole honeycomb filter element entity is obtained.
Comparative example 4
This example provides a method for preparing a filter element by a conventional method, which includes mixing and melting iron, chromium, and aluminum at a mass ratio of 75:20:5, casting, rolling into a corrugated sheet with a thickness of 0.08mm, rolling and welding the corrugated sheet, and preparing a straight-through hole honeycomb filter element with a triangular cross section.
Oxidation resistance test
The filter elements of examples 2 to 7 and comparative examples 1 to 3 were subjected to an oxidation resistance test using the GB/T13303 high temperature oxidation resistance test standard, the filter elements prepared in examples 2 and 3, and the Fe-20Cr-5Al filter element prepared by the conventional cast-rolling method, at a test temperature of 700 ℃, in an atmosphere of air, and in a specific surface area, and the test results are shown in Table 1:
table 1: results of the oxidation resistance and specific surface test of the filter cartridges of examples 2 to 7 and comparative examples 1 to 3
The test results in table 1 show that the filter element of example 2 has higher oxidation resistance than the filter elements prepared in example 3 and the conventional method due to the increase of the aluminum content, while the filter element material of example 2 has high aluminum content and high brittleness, so that the filter element cannot be prepared by the conventional method; on the other hand, the BET area of the comparative example is increased by two to three times compared with the BET areas of the examples and the traditional preparation method, so that the catalytic efficiency of the filter element after coating is greatly improved, and meanwhile, the traditional preparation method cannot complete the preparation of spiral through holes, so that the filter element can be prepared only by an SLM3D printing method, and the unique process advantage of the 3D printing method is embodied.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The waste gas treatment purifier is characterized by comprising a shell and a filter element arranged in the shell; the filter element is internally provided with a honeycomb type through hole which is a spiral ascending type through hole.
2. The exhaust gas treatment purifier of claim 1, wherein a horizontal cross-section of the honeycomb through-holes comprises at least one of the following shapes: triangle, square, pentagon, hexagon.
3. The exhaust treatment purifier of claim 2, wherein the honeycomb through-holes have a helix angle of 0 ° to n x 360 °, wherein n ≧ 1.
4. The exhaust gas treatment purifier of claim 1, wherein the filter element is a high aluminum content iron-chromium alloy filter element; wherein, the content of Al element is 5-40 wt.%, the content of Cr is 10-40 wt.%, and the rest is Fe.
5. A preparation method of a filter element of a waste gas treatment purifier is characterized by comprising the following steps:
s1, creating a three-dimensional model of a filter element by using three-dimensional modeling software;
s2, slicing the three-dimensional model of the filter element by adopting slicing software so as to control the scanning track of the laser beam; adopting Ar, N2 or mixed gas of Ar + N2 as protective atmosphere;
s3, paving alloy particles, and then obtaining a current layer by adopting a laser melting 3D printing method;
and S4, repeating the step S3 on the current layer for multiple times until a preset filter element entity with an optimized structure is obtained.
6. The method for preparing a filter element of an exhaust gas treatment purifier as recited in claim 5, wherein the powder is spread in step S3 to a thickness of 20-300 μm.
7. The method as claimed in claim 5, wherein the power of the laser beam in step S3 is 100-1500W.
8. The method of manufacturing a filter element for an exhaust gas purifying device according to claim 5, wherein the laser beam spot size in the step S3 is 30 to 70 μm.
9. The method for preparing a filter element of an exhaust gas purifying device as recited in claim 5, wherein the pitch of the laser scanning in the step S3 is 0.005-0.07 mm; the scanning speed is 50-5000 mm/s.
10. The method for preparing the exhaust-gas treatment purifier filter element according to claim 5, further comprising performing heat treatment on the printed filter element, wherein the heat treatment process comprises annealing treatment in a protective atmosphere of 200-1200 ℃; before or after the heat treatment, the preparation of a pre-oxidation transition layer is carried out on the surface of the filter element, and a catalytic coating process is carried out on the basis of the pre-oxidation transition layer.
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