WO2005039738A1 - ハニカム構造体 - Google Patents
ハニカム構造体 Download PDFInfo
- Publication number
- WO2005039738A1 WO2005039738A1 PCT/JP2004/015808 JP2004015808W WO2005039738A1 WO 2005039738 A1 WO2005039738 A1 WO 2005039738A1 JP 2004015808 W JP2004015808 W JP 2004015808W WO 2005039738 A1 WO2005039738 A1 WO 2005039738A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sealing material
- hole group
- holes
- inlet
- cam structure
- Prior art date
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- 239000003566 sealing material Substances 0.000 claims abstract description 122
- 239000000919 ceramic Substances 0.000 claims abstract description 47
- 238000005192 partition Methods 0.000 claims abstract description 38
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 15
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 229910021426 porous silicon Inorganic materials 0.000 claims description 4
- 238000007789 sealing Methods 0.000 abstract description 30
- 230000008646 thermal stress Effects 0.000 abstract description 11
- 238000012545 processing Methods 0.000 abstract description 2
- 230000014509 gene expression Effects 0.000 abstract 1
- 238000011084 recovery Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 52
- 238000000034 method Methods 0.000 description 27
- 239000003054 catalyst Substances 0.000 description 21
- 239000000463 material Substances 0.000 description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 16
- 230000008929 regeneration Effects 0.000 description 15
- 238000011069 regeneration method Methods 0.000 description 15
- 239000011230 binding agent Substances 0.000 description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 12
- 239000002245 particle Substances 0.000 description 12
- 238000002485 combustion reaction Methods 0.000 description 11
- 239000000843 powder Substances 0.000 description 11
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 10
- 239000002956 ash Substances 0.000 description 9
- 238000000746 purification Methods 0.000 description 9
- 239000000835 fiber Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 229910010271 silicon carbide Inorganic materials 0.000 description 8
- 239000000203 mixture Substances 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 239000002994 raw material Substances 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 6
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical group OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 description 4
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 4
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 4
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 4
- 239000002612 dispersion medium Substances 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
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- 239000010954 inorganic particle Substances 0.000 description 4
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- 229910052863 mullite Inorganic materials 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
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- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 3
- -1 alumina Chemical compound 0.000 description 3
- 229910052878 cordierite Inorganic materials 0.000 description 3
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
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- 229910052574 oxide ceramic Inorganic materials 0.000 description 3
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- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 3
- 229910052582 BN Inorganic materials 0.000 description 2
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 229910003460 diamond Inorganic materials 0.000 description 2
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- 238000002347 injection Methods 0.000 description 2
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- 238000004898 kneading Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 150000002736 metal compounds Chemical class 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 229910052703 rhodium Inorganic materials 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- VPSXHKGJZJCWLV-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-3-(1-ethylpiperidin-4-yl)oxypyrazol-1-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C=1C(=NN(C=1)CC(=O)N1CC2=C(CC1)NN=N2)OC1CCN(CC1)CC VPSXHKGJZJCWLV-UHFFFAOYSA-N 0.000 description 1
- 229910000505 Al2TiO5 Inorganic materials 0.000 description 1
- 238000007088 Archimedes method Methods 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 239000001856 Ethyl cellulose Substances 0.000 description 1
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 1
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
- JAWMENYCRQKKJY-UHFFFAOYSA-N [3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-ylmethyl)-1-oxa-2,8-diazaspiro[4.5]dec-2-en-8-yl]-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]methanone Chemical compound N1N=NC=2CN(CCC=21)CC1=NOC2(C1)CCN(CC2)C(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F JAWMENYCRQKKJY-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003377 acid catalyst Substances 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
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- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- IXSUHTFXKKBBJP-UHFFFAOYSA-L azanide;platinum(2+);dinitrite Chemical compound [NH2-].[NH2-].[Pt+2].[O-]N=O.[O-]N=O IXSUHTFXKKBBJP-UHFFFAOYSA-L 0.000 description 1
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- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
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- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- AABBHSMFGKYLKE-SNAWJCMRSA-N propan-2-yl (e)-but-2-enoate Chemical compound C\C=C\C(=O)OC(C)C AABBHSMFGKYLKE-SNAWJCMRSA-N 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
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- 230000000630 rising effect Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 229910003468 tantalcarbide Inorganic materials 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- 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
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/247—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the cells
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
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- B01D46/2418—Honeycomb filters
- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
- B01D46/244—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material of the plugs
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- B01D46/2418—Honeycomb filters
- B01D46/2425—Honeycomb filters characterized by parameters related to the physical properties of the honeycomb structure material
- B01D46/24494—Thermal expansion coefficient, heat capacity or thermal conductivity
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- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2476—Monolithic structures
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- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
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- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2478—Structures comprising honeycomb segments
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2484—Cell density, area or aspect ratio
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- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/80—Chemical processes for the removal of the retained particles, e.g. by burning
- B01D46/84—Chemical processes for the removal of the retained particles, e.g. by burning by heating only
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- 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
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/20—Carbon compounds
- B01J27/22—Carbides
- B01J27/224—Silicon carbide
-
- B01J35/56—
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
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- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2459—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the plugs
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B01D46/2418—Honeycomb filters
- B01D46/2451—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure
- B01D46/2486—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure characterised by the shapes or configurations
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00793—Uses not provided for elsewhere in C04B2111/00 as filters or diaphragms
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0081—Uses not provided for elsewhere in C04B2111/00 as catalysts or catalyst carriers
Definitions
- the present invention relates to a filter for removing particulates and the like in exhaust gas discharged from an internal combustion engine such as a diesel engine, and a honeycomb structure used as a catalyst carrier.
- Two types of through-holes are provided, and the end of the large-volume through-hole group on the exhaust gas outlet side is sealed with a sealing material, and the end of the small-volume through-hole group on the exhaust gas inlet side Is sealed with a sealing material, and the surface area of the through hole (hereinafter also referred to as the inlet side through hole) whose inlet side is opened is compared with the surface area of the through hole (hereinafter also referred to as the outlet side through hole) whose outlet side is open.
- a filter that suppresses an increase in pressure loss during particulate collection by increasing the relative size is known (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).
- a filter in which the shape of the inlet side through hole and the outlet side through hole is an octagon and a square, respectively, is also known (see, for example, Patent Document 4 and Patent Document 5).
- a filter or the like in which the surface area of the inlet side through hole group is relatively larger than the surface area of the outlet side through hole group by increasing the number of inlet side through holes than the number of outlet side through holes. are also known (for example, see FIG. 3 of Patent Document 6 and Patent Document 7).
- the total surface area of the inlet side through hole group and the total surface area of the outlet side through hole group Compared with the two-cam structure, the total surface area of the inlet-side through hole group is set to be relatively large, so that the thickness of the deposited layer of collected particulates is reduced.
- the engine control is performed to increase the temperature of the exhaust gas, or the temperature of the heater installed upstream of the honeycomb structure is increased.
- a regeneration process is performed in which the particulate is brought into contact with a high-temperature gas and burned, but by reducing the thickness of the deposited layer of the particulate, the burning rate of the particulate can be increased. it can.
- the hard cam has a large aperture ratio.
- the density of the through-holes occupying the large cam structure is increased, resulting in a low density and low heat capacity. Therefore, the responsiveness when the temperature is raised is also improved.
- Patent Document 8 describes that 2-5 mm is preferable! /.
- Patent Document 1 Japanese Patent Laid-Open No. 56-124417
- Patent Document 2 Japanese Patent Laid-Open No. 62-96717
- Patent Document 3 US Patent No. 4364761
- Patent Document 4 International Publication No. 02Z10562A1 Pamphlet
- Patent Document 5 French Patent Invention No. 2789327 Specification
- Patent Document 6 Japanese Patent Laid-Open No. 58-196820
- Patent Document 7 U.S. Pat.No. 4,417,908
- Patent Document 8 US Patent Application Publication No. 2003Z0041730A1
- the inventors of the present invention have intensively studied in view of the above problems, and as a result, cracks are generated in the outlet side sealing portion during the regeneration process.
- the heat capacity of the her cam structure is reduced, and the temperature of the outlet-side sealing part rises rapidly during the regeneration process, resulting in a locally high temperature. I found out.
- the inventor of the present invention prevents the outlet-side sealing portion from locally becoming hot during the regeneration process by increasing the heat capacity of the outlet-side sealing portion to some extent. It has been found that cracks can be prevented from occurring in the sealing portion, and the present invention has been completed.
- the first hard-cam structure of the present invention is a columnar her-cam structure mainly composed of a porous ceramic force in which a plurality of through holes are arranged in parallel in the longitudinal direction with a partition wall therebetween.
- the plurality of through-holes include an inlet-side through-hole group in which an end portion on the outlet side is sealed with a sealing material so that a total area of cross sections perpendicular to the longitudinal direction is relatively large,
- the end portion on the inlet side is composed of a group of outlet-side through holes sealed with the sealing material so that the total area of the cross section is relatively small, and the opening ratio on the inlet side is X (% )
- the her cam structure of the first aspect of the present invention further seals the inlet side through hole group per 11.8 cm 2 of the outlet side end face configured to include the outlet side through hole group.
- the first structure of the present invention further satisfies the relationship of the following formula (4).
- the first structure of the present invention further satisfies the relationship of the following formula (5).
- the porous ceramic is preferably porous silicon carbide.
- the her cam structure of the second aspect of the present invention is a sealing material on the outer peripheral surface of a her cam block in which a plurality of the her cam structures of the first aspect of the present invention are combined via a sealing material layer. A layer is formed.
- first hard-cam structure of the present invention may be used as a filter when only one is used as a constituent member of the second hard-cam structure of the present invention! / ,.
- a herm cam structure having a structure formed as a whole such as the her cam structure of the first aspect of the present invention
- an integrated her cam structure A honeycomb structure having a structure in which a plurality of ceramic members are combined through a sealing material layer, such as the inventive Hercam structure, is also referred to as an aggregate-type honeycomb structure.
- an integral type hard cam structure and an aggregate type hard cam structure it is called a her cam structure.
- the inlet-side opening ratio X and the outlet-side end face per 11.8 cm 2 are configured to include the outlet-side through hole group.
- the sum of the heat capacities at 500 ° C of the sealing material that seals the hole group satisfies the relationship of the above formulas (1) and (2).
- the side sealing part can be prevented from becoming locally hot, and the thermal stress at the outlet side sealing part can be relieved to suppress the generation of cracks. Can do.
- the opening ratio X on the inlet side and the outlet side end surface composed of the outlet side through hole group 11.8 cm 2 of the sealing material sealing the inlet side through hole group per 16.8 cm 2 The relationship between the sum Y of the heat capacities of Y and the sum of heat capacities Z at 25 ° C of the sealant sealing the inlet or through-hole group is expressed by the above formula (3)-( Since 5) is satisfied, the generation of thermal stress at the outlet side sealing portion can be more effectively mitigated, and the generation of cracks can be suppressed.
- porous silicon carbide when porous silicon carbide is used as the porous ceramic, it is excellent in thermal conductivity, heat resistance, mechanical properties, chemical resistance, and the like. It will be.
- the second hard-cam structure of the present invention a plurality of the hard-cam structures of the first present invention are combined through the seal material layer, so that the seal material layer It is possible to improve the heat resistance by reducing the thermal stress and to adjust the size freely by increasing or decreasing the number of the hard cam structures of the first present invention.
- the same effect as the first hard-cam structure of the present invention described above can be obtained.
- a honeycomb structure according to a first aspect of the present invention is a columnar hard cam structure mainly composed of a porous ceramic force in which a plurality of through holes are arranged in parallel in a longitudinal direction with a partition wall therebetween.
- the through-hole includes an inlet-side through-hole group in which the end on the outlet side is sealed with a sealing material so that the sum of the areas of the cross-sections perpendicular to the longitudinal direction is relatively large, and the area of the cross-section.
- the end portion on the inlet side is made up of the outlet side through-hole group sealed with the sealing material so that the total sum of these is relatively small, and the opening ratio on the inlet side is X (%),
- the opening ratio X on the inlet side refers to the inlet at the end surface on the inlet side of the her cam structure. This is the ratio of the total area of the side through hole group.
- the total area of the end face on the inlet side of the her cam structure is the sum of the areas of the parts composed of the through holes and the partition walls, and the total area of the end face on the inlet side does not include the part occupied by the sealing material layer. Suppose there is nothing.
- Fig. 1 (a) is a perspective view schematically showing an example of an integrated her-cam structure of the present invention.
- (b) is a cross-sectional view taken along line AA of the integrated her-cam structure of the present invention shown in (a).
- the integral type hard cam structure 20 has a substantially quadrangular prism shape, and a large number of through holes 21 are arranged in parallel with a partition wall 23 in the longitudinal direction.
- the through-hole 21 includes an inlet-side through-hole group 21a that is sealed by a sealing material 22 at an end portion on the outlet side of the integrated hermetic structure 20, and an inlet-side through hole group 21a. It consists of two types of through-holes, the outlet through-hole group 21b sealed by the sealing material 22 at the end, and the inlet-side through-hole group 21a has a total cross-sectional area perpendicular to the longitudinal direction.
- the partition wall 23 is relatively large with respect to the hole group 21b, and the partition wall 23 that separates the through holes 21 functions as a filter. That is, the exhaust gas flowing into the inlet side through hole group 21a always passes through the partition wall 23 and then flows out from the outlet side through hole group 21b.
- the integrated her cam structure of the present invention has an opening ratio of X (%) on the inlet side, and includes the outlet side through hole group described above per 11.8 cm 2 of the outlet side end face.
- the inlet-side through-hole group per 11.8 cm 2 of the outlet-side end face configured to include the outlet-side through-hole group is sealed at 500 ° C of the sealing material.
- the sum Y of heat capacities is an integrated her cam structure comprising a partition wall 23, a plurality of sealing materials 22 sealing the inlet side through hole group 21a, and an outlet side through hole group 21b. This is the sum of heat capacities when the heat capacity of one or more sealing materials 22 including the end portion per area of 11.8 cm 2 is measured at 500 ° C. .
- the integrated her-cam structure of the present invention includes the outlet-side through hole group. On the exit side End face 11. Total heat capacity at 500 ° C of the sealing material 22 that seals the inlet side through hole group 21a per 8cm 2 Y force Relationship between the above formula (1) and the opening ratio X on the inlet side Meet.
- End face on the outlet side configured to include the outlet side through-hole group 11.
- the lower limit of total Y is 0.0157X-0.0678, and the upper limit is 1.15X-5.
- 0.0157X— 0.0678 ⁇ Y the total heat capacity Y of the sealing material 22 sealing the inlet-side through hole group 21a is too small in relation to the opening ratio X on the inlet side.
- the outlet side sealing part rapidly rises due to the heat generated by the combustion of the particulates accumulated in the deep part of the inlet side through hole 21a, and cracks are generated due to thermal stress.
- the total heat capacity of the sealing material 22 that seals the inlet-side through hole group 21a is too large in relation to the opening ratio X on the inlet side.
- the partition wall 23 in contact with the sealing material 22 that seals the inlet-side through-hole group 21a rapidly rises due to the heat generated by the combustion of the particulate accumulated in the deep part of the inlet-side through-hole 21a, while the inlet-side through-hole Cracks are generated near the interface between the sealing material 22 and the partition wall 23 where the temperature rise of the sealing material 22 that seals the group 21a is small.
- Outlet-side end face configured to include the outlet-side through hole group 11.
- the desirable lower limit of sum Y is 0.05X-0.55, and the desirable upper limit is 0.574X-2. That is, it is desirable that the integral type hard cam structure of the present invention further satisfies the relationship of the following formula (4). 0. 05X-0. 55 ⁇ Y ⁇ 0. 574 ⁇ -2--(4)
- the lower limit of the opening ratio X on the inlet side is 35%, and the upper limit is 60%. If the opening ratio X on the inlet side is less than 35% or the opening ratio X on the inlet side exceeds 60%, there is no tendency for particulates to be easily collected in the deep part of the inlet-side through hole 21a. Therefore, it is not necessary to particularly adjust the relationship between the opening ratio X on the inlet side and the sum Y of the heat capacities of the sealing materials 22 sealing the inlet side through-hole 2 la group. Desirably, the lower limit of the opening ratio X on the inlet side is 40%, and the upper limit is 55%.
- the integrated her-cam structure of the present invention has an opening ratio X on the inlet side and an inlet side through hole group per 11.8 cm 2 of an outlet side end surface including the outlet side through hole group.
- the total heat capacity Y at 500 ° C of the sealing material is satisfied, so that the relationship of the above formulas (1) and (2) is satisfied.
- the generation of thermal stress can be alleviated and the generation of cracks can be suppressed.
- the aperture ratio X on the inlet side seals the inlet-side through-hole group of the end face 11. per 8 cm 2 of configured outlet comprising said exit side through-hole group by!
- the total heat capacity Y of the sealing material 22 sealing the inlet side through-hole group 21a and the total heat capacity of the sealing material sealing the inlet-side through hole group at 500 ° C C For example, the material of the sealing material 22 and the thickness of the sealing material 22 (filling amount into the inlet side through-hole group 21a) are appropriately set so as to satisfy the relationship of the above formulas (1) and (5). Choose it!
- the integrated Hercam structure 20 mainly has a porous ceramic force, and examples of the material include nitride ceramics such as aluminum nitride, silicon nitride, boron nitride, and titanium nitride, silicon carbide, and carbonized carbide. Examples thereof include carbide ceramics such as zirconium, titanium carbide, tantalum carbide, and tungsten carbide, and oxide ceramics such as alumina, zirconium, cordierite, mullite, and silica.
- the integral type hard cam structure 20 may be formed of a composite of silicon and silicon carbide, aluminum titanate, and two or more kinds of material forces.
- the particle size of the ceramic used in the manufacture of the integrated her cam structure 20 is not particularly limited, but it is desirable that the ceramics have less shrinkage in the subsequent firing step, for example, 0.3-50.
- the sealing material 22 and the partition wall 23 constituting the integrated her cam structure 20 are made of the same porous ceramic.
- the adhesive strength between the two can be increased, and the thermal expansion coefficient of the partition wall 23 and the thermal expansion coefficient of the sealing material 22 can be adjusted by adjusting the porosity of the sealing material 22 in the same manner as the partition wall 23.
- the gap between the sealing material 22 and the partition wall 23 due to thermal stress during manufacturing or use, or the partition wall of the part that contacts the sealing material 22 or the sealing material 22 23 can be prevented from cracking.
- the sealing material 22 may contain a metal or the like in addition to the ceramic described above in order to adjust its heat capacity.
- the metal is not particularly limited, and examples thereof include iron, aluminum, metal silicon (Si) and the like. These may be used alone or in combination of two or more.
- the thickness of the sealing material 22 is not particularly limited.
- the specific heat capacity of silicon carbide at 25 ° C is 690 jZK'kg, Since the specific heat capacity at 500 ° C is 1120 JZK 'kg, in order to satisfy the relationship of the above formulas (1) and (2), it is desirable that the above formulas (3) and (4 ) 3 ⁇ 2 Omm is more desirable to satisfy the relationship
- the thickness of the partition wall 23 is not particularly limited, but a desirable lower limit is 0.1 mm, and a desirable upper limit is 1.2 mm. If it is less than 1 mm, the strength of the integrated her-cam structure 20 may not be sufficient. 1. If the thickness exceeds 2 mm, the temperature of the partition wall 23 in contact with the sealing material 22 that seals the inlet-side through hole group 21a becomes difficult to rise, so thermal stress is applied near the interface between the sealing material 22 and the partition wall 23. Cracks may occur.
- the porosity of the integral type hard cam structure 20 is not particularly limited, but a desirable lower limit is 20% and a desirable upper limit is 80%. If it is less than 20%, the integrated hermetic structure 20 may be clogged immediately. On the other hand, if it exceeds 80%, the strength of the integrated honeycomb structure 20 is reduced and easily broken. May be.
- the porosity can be measured by a conventionally known method such as a mercury intrusion method, an Archimedes method, or a measurement using a scanning electron microscope (SEM).
- the desirable lower limit of the average pore diameter of the integrated her-cam structure 20 is 1 ⁇ m, and the desirable upper limit is 100 m. : If it is less than L m, the particulates can easily become clogged. On the other hand, if it exceeds 100 m, the particulates pass through the pores, and the particulates cannot be collected and may not function as a filter.
- the integrated her-cam structure 20 shown in FIG. 1 has a substantially quadrangular prism shape
- the shape of the integrated her-cam structure of the present invention is not particularly limited as long as it is a columnar body.
- a columnar body whose cross-sectional shape perpendicular to the longitudinal direction is polygonal, circular, elliptical, fan-shaped, etc. can be mentioned.
- the end portion on the outlet side is made of a sealing material so that the sum of the areas of the cross sections perpendicular to the longitudinal direction is relatively large.
- the through-holes constituting the inlet-side through-hole group and the through-holes constituting the Z- or outlet-side through-hole group are each one kind of through-hole having the same shape and the cross-sectional area perpendicular to the longitudinal direction. It may be composed of two or more types of through holes with different shapes and cross-sectional areas perpendicular to the longitudinal direction.
- the shape as a basic unit is repeated.
- the area ratio of the cross section differs between the inlet side through hole group and the outlet side through hole group.
- there is a part lacking in the basic unit in the part near the outer periphery and that part deviates from the above principle. Therefore, if even the outer cell is measured strictly, if it is included in the hard structure of the present invention, it is calculated by excluding that cell or by repeating the basic unit. Then, calculate by dividing 1 part. Specifically, for example, as shown in FIG.
- the shape of the cross-section perpendicular to the longitudinal direction of the through-hole is the same in all portions other than the vicinity of the outer periphery, and the cross-sectional shape is the same.
- the two-cam structure having a configuration in which either one end of the hole is sealed and the sealing portion and the open portion of each end face are arranged in a checkered pattern as a whole. It is not included in the her cam structure of the present invention.
- the exhaust gas purifying filter when regenerating the exhaust gas purifying filter that has collected particulates and the pressure loss has increased, the combustion power of the particulates during combustion In addition to carbon that disappears, it contains metals that burn and become oxides, and these remain as ash in the exhaust gas filter. Ashes usually remain near the outlet of the exhaust gas purification filter, the through holes that make up the exhaust gas purification filter are filled with ash near the outlet, and the ash The volume of the portion filled with the gas gradually increases, and the volume (area) of the portion functioning as the exhaust gas purifying filter gradually decreases. If the accumulated amount of ash becomes too large, it will no longer function as a filter, and the exhaust pipe power is removed and backwashed to remove the ash from the exhaust gas purification filter, or the exhaust gas purification filter is discarded. Will be.
- the integrated her-cam structure of the present invention has a filter for exhaust gas purification even if ash accumulates, compared with the case where the volume of the inlet side through hole group and the volume of the outlet side through hole group are the same.
- the volume (area) of the portion that functions as the pressure loss due to ash with a small reduction ratio is also reduced. Therefore, the period until the reverse cleaning or the like is required becomes longer, and the life of the exhaust gas purifying filter can be extended. As a result, maintenance costs required for backwashing and replacement can be greatly reduced.
- the through-holes constituting adjacent inlet-side through-hole groups and Particulates accumulate evenly in the partition walls shared by the through-holes constituting the adjacent inlet-side through-hole groups, not only by the partition walls shared by the through-holes constituting the outlet-side through-hole group. This is because immediately after the start of particulate collection, the gas flows through the through-hole force constituting the inlet-side through-hole group and also toward the through-hole constituting the outlet-side through-hole group.
- the through holes that make up the group and the through holes that make up the outlet side through hole group are deposited on the partition walls, but the force of collecting the particulates and forming a cake layer ⁇ , inlet Gas that does not flow easily through the partition walls shared by the through-holes constituting the side through-hole group and the through-holes constituting the outlet-side through-hole group, and is gradually shared by the through-holes constituting the inlet-side through-hole group In addition, the generation of gas flow also contributed. Therefore, after collecting the particulates for a certain period, the particulates are uniformly deposited on the partition walls of the through holes constituting the inlet side through hole group.
- the integrated her cam structure of the present invention performs filtration. Therefore, when the same amount of particulates is accumulated, the thickness of the particulates accumulated in the partition walls can be reduced. For this reason, in the integrated her cam structure of the present invention, the rate of increase in pressure loss that increases as time elapses from the start of use decreases, and the pressure loss when considering the entire use period as a filter is reduced. Loss can be reduced.
- the desirable lower limit of the aperture ratio (the entrance-side aperture ratio XZ-exit-side aperture ratio) is 1.5, and the desirable upper limit is 8.0. 1. If it is less than 5, the accumulation amount of the ash becomes large immediately, the pressure loss becomes high, and in order to make the pressure loss low, the partition wall must be thinned. The cam structure 20 may not have sufficient strength. On the other hand, if it exceeds 8.0, the opening ratio on the outlet side is too small, so that the pressure loss due to friction when passing through the outlet side through hole group 21b can be increased more than necessary.
- the number of through-holes constituting the inlet-side through-hole group 21a and the number of through-holes constituting the outlet-side through-hole group 21b are not particularly limited. The same number is desirable. With such a configuration, it is difficult to participate in exhaust gas filtration. Walls can be minimized and pressure loss due to friction when passing through the through hole inlet side and friction when passing through the Z or through hole outlet side can be prevented from rising more than necessary. Is possible.
- the number of through-holes as shown in FIG. 2 is substantially equal to the number of through-hole groups 101 in the inlet-side through-hole group 101 and the outlet-side through-hole group 102. When the number is substantially the same, the pressure loss due to friction when passing through the through-hole outlet side is low, so the pressure loss of the entire honeycomb structure is low.
- FIG. 3 (a) one (d) and FIG. 4 (a) one (f) are cross-sectional views schematically showing a cross section perpendicular to the longitudinal direction in the integrated heart structure of the present invention.
- FIG. 3 (e) is a cross-sectional view schematically showing a cross section perpendicular to the longitudinal direction in a conventional integrated honeycomb structure.
- the integrated her-cam structure 110 shown in FIG. 3 (a) has an aperture ratio of approximately 1.55, and the integrated her-cam structure 120 shown in FIG. 2.54, Fig. 3 (c) shows an integrated hammer structure 130, which is approximately 4.45, and Fig. 3 (d) shows an integrated harcom structure 140, which is approximately 9.86. It is. Figures 4 (a), (c), and (e) all have an aperture ratio of approximately 4.45, and Figures 4 (b), (d), and (f) all have approximately 6.00. It is.
- FIGS. 3 (a) to 3 (d) are all large-volume through-holes 11 la, 121a, 1 31a, and 141a constituting the inlet-side through-hole group, and the above-described cross-sectional shape is an octagonal shape, and the outlet-side through-holes
- the above-mentioned cross-sectional shapes of the small-volume through-holes ll lb, 121b, 131b, and 141b that form the group are quadrangular (square), each of which is arranged alternately, changing the cross-sectional area of the small-volume through-holes
- the aperture ratio can be easily changed arbitrarily by slightly changing the cross-sectional shape of the large-volume through hole.
- the aperture ratio of the integrated her-cam structure shown in FIG. 4 can be arbitrarily changed.
- the integrated her-cam structure 150 shown in FIG. 3 (e) has an inlet-side through hole 152a and an outlet.
- the cross-sectional shapes of the side through-holes 152b are both quadrangular and are arranged alternately.
- the cross-sectional shapes of the large-volume through-holes 161a and 261a constituting the inlet-side through-hole group are pentagons. There are three corners, and the small-diameter through-holes 161b and 261b constituting the outlet-side through-hole group are quadrangular in cross section, and each occupies a diagonally opposite portion of a large square. It is configured as follows. 4 (c) One (d) of the integrated her-cam structure 170, 270 is a modified version of the cross section shown in FIG.
- the bulkhead through holes 171a and 271a that make up the group and the small volume through holes 17 lb and 271b that make up the outlet side through hole group have a shape that expands with a curvature on the small volume through hole side.
- the This curvature may be arbitrary, for example, the curve constituting the partition may correspond to 1Z4 circle. In this case, the aperture ratio is 3.66. Therefore, in the integrated hermetic structures 170, 270 shown in FIGS. 4 (c)-(d), the small volume through-holes 171b, 271b have a larger volume than that in which the curve constituting the partition corresponds to 1 Z4 circle. The area of the cross section is getting smaller.
- the large-volume through-holes 181a and 281a that constitute the quadrilateral (rectangular) inlet-side through-hole group are output.
- the small through-holes 281b and 281b constituting the mouth-side through hole group are provided adjacent to each other in the vertical direction to form a rectangular structural unit.
- the above structural units are continuous in the vertical direction and are alternately in the horizontal direction. It ’s made up of differences.
- FIG. 5 shows a configuration in which a large-volume through-hole 19 la constituting the inlet-side through-hole group and a small-volume through-hole 19 lb constituting the outlet-side through-hole group are provided in the integrated her cam structure 190 shown in FIG.
- the integrated her cam structure 20 purifies CO, HC, NOx, etc. in the exhaust gas.
- a catalyst that can be supported is good!
- the integrated her cam structure 20 functions as a filter that collects particulates in the exhaust gas, and also contains C 0, HC, and NOx contained in the exhaust gas. It functions as a catalytic converter for purifying etc.
- the catalyst to be supported on the integral type hard cam structure 20 is not particularly limited as long as it is a catalyst capable of purifying CO, HC, NOx, etc. in the exhaust gas.
- a catalyst capable of purifying CO, HC, NOx, etc. in the exhaust gas For example, platinum, palladium And noble metals such as rhodium. Of these, a so-called three-way catalyst that has platinum, noradium, and rhodium power is desirable.
- it also supports Al metal (group 1 of periodic table), alkaline earth metals (group 2 of periodic table), rare earth elements (group 3 of periodic table), transition metal elements, etc. as promoters You may let them.
- the catalyst may be supported on the surface of the pores of the integral type hard cam structure 20, or may be supported with a certain thickness on the partition wall 23. Further, the catalyst may be uniformly supported on the surface of the partition wall 23 and the surface of Z or pores, or may be supported unevenly at a certain place. In particular, it is desirable that both of these are carried on the surface of the partition wall 23 in the through-hole 21 constituting the inlet-side through-hole group or on the surface of the pores near the surface. More desirable. This is because the catalyst can easily come into contact with the particulates, so that the particulates can be burned efficiently.
- the catalyst when the catalyst is applied to the integral type hard cam structure 20, it is desirable to apply the catalyst after the surface is previously coated with a support material such as alumina. As a result, the specific surface area can be increased, the degree of dispersion of the catalyst can be increased, and the number of reaction sites of the catalyst can be increased. In addition, since the support metal can prevent sintering of the catalyst metal, the heat resistance of the catalyst is also improved. It makes it possible to reduce pressure loss.
- the integrated Hercam structure of the present invention on which the catalyst is supported is a conventionally known DPF with catalyst.
- Only one integrated hermetic structure of the present invention may be used as an integrated filter, but a plurality of V may be bundled through a sealing material layer and used as an aggregate filter. Is desirable.
- the thermal stress is reduced by the sealing material layer to improve the heat resistance of the filter, and the number of integral type hard cam structures of the present invention can be increased or decreased freely. It is a force that can adjust the size of the filter.
- the integrated filter and the aggregate filter have the same function.
- an oxide ceramic such as cordierite is usually used as the material. This is because the filter can be manufactured at low cost and has a relatively small coefficient of thermal expansion, so that there is less risk of damage to the filter due to thermal stress during manufacture and use!
- a surface be provided with a sealing material layer having a material strength that makes it difficult for gas to pass through compared to the integrated her cam structure of the present invention.
- the sealing material layer By forming the sealing material layer on the outer peripheral surface, the integrated hearth structure of the present invention can be compressed by the sealing material layer, the strength is improved, and the ceramic particles accompanying the generation of cracks are improved. Shattering can be prevented.
- the aggregated hard cam structure of the present invention has a sealing material layer on the outer peripheral surface of a her cam block in which a plurality of the integrated her cam structures of the present invention are combined via a sealing material layer. It is formed and functions as an aggregate filter.
- FIG. 7 is a perspective view schematically showing an example of an aggregate type hard cam structure of the present invention.
- the end of the outlet side is sealed with a sealing material so that the sum of the cross-sectional areas perpendicular to the longitudinal direction is relatively large.
- the aggregate type hard cam structure 10 is used as a filter for exhaust gas purification, and the integrated type hard cam structure 20 is interposed via the seal material layer 14.
- the seal material layer 14 is interposed via the seal material layer 14.
- a plurality of hard cam blocks 15 are formed, and a seal material layer 13 for preventing leakage of exhaust gas is formed around the hard cam block 15.
- silicon carbide having excellent thermal conductivity, heat resistance, mechanical characteristics, chemical resistance, and the like is used as a material constituting the integral type hard cam structure 20. Desirable.
- the sealing material layer 14 is formed between the integrated ceramic structures 20 and functions as an adhesive that binds the plurality of integrated ceramic structures 20 together.
- the sealing material layer 13 is formed on the outer peripheral surface of the honeycomb block 15, and when the aggregate type hard cam structure 10 is installed in the exhaust passage of the internal combustion engine, the sealing material layer 13 extends from the outer peripheral surface of the her cam block 15. It functions as a sealing material to prevent the exhaust gas passing through the through hole from leaking.
- the sealing material layer 13 and the sealing material layer 14 may have the same material force or may be made of different materials. Furthermore, when the sealing material layer 13 and the sealing material layer 14 are made of the same material, the mixing ratio of the materials may be the same or different.
- the sealing material layer 14 may also have a dense physical strength, or may have a porous physical strength so that exhaust gas can flow into the inside thereof. It is desirable that the sealing material layer 13 has a dense body strength.
- the sealing material layer 13 is formed for the purpose of preventing the exhaust gas from leaking out of the outer peripheral surface of the her cam block 15 when the aggregate type hard cam structure 10 is installed in the exhaust passage of the internal combustion engine. Because.
- the material constituting the sealing material layer 13 and the sealing material layer 14 is not particularly limited, for example,
- an inorganic binder an organic binder, inorganic fibers and Z or inorganic particles.
- Examples of the inorganic binder include silica sol and alumina sol. These may be used alone or in combination of two or more. Among the inorganic binders, silica zonole is desirable.
- Examples of the organic binder include polybulal alcohol, methyl cellulose, ethyl cellulose, carboxymethyl cellulose, and the like. These may be used alone or in combination of two or more. Among the above organic binders, carboxylmethylcellulose is desired.
- Examples of the inorganic fiber include ceramic fibers such as silica-alumina, mullite, alumina, and silica. These may be used alone or in combination of two or more. Among the inorganic fibers, silica alumina fibers are desirable.
- examples of the inorganic particles include carbides, nitrides, and the like, and specific examples include inorganic powders or whiskers such as silicon carbide, silicon nitride, and boron nitride. These may be used alone or in combination of two or more. Of the inorganic particles, silicon carbide having excellent thermal conductivity is desirable.
- the integrated her cam structure of the present invention when used as it is as a filter for an exhaust gas purifier, the same seal as that of the aggregated her cam structure of the present invention is used.
- a material layer may be provided on the outer peripheral surface of the integrated her-cam structure of the present invention.
- the aggregate-type hard cam structure 10 shown in FIG. 7 has a cylindrical force.
- the shape of the aggregate-type honeycomb structure of the present invention is not particularly limited as long as it is a columnar body.
- a columnar body whose cross-sectional shape perpendicular to the longitudinal direction is polygonal or elliptical can be mentioned.
- the cross-sectional shape perpendicular to the longitudinal direction becomes a polygon, a circle, an ellipse, or the like.
- the outer peripheral portion may be covered as described above, or after the above-described cross-sectional shape of the integrated her-cam structure of the present invention is preliminarily formed, the cross-section perpendicular to the longitudinal direction can be obtained by binding them with a sealing material.
- the shape of the cross-section perpendicular to the longitudinal direction may be a fan-like shape in which the circle is divided into four parts.
- the cylindrical aggregated hard cam structure of the present invention can be manufactured.
- Hercam structure strength S of the present invention which is an integral filter composed entirely of a sintered strength
- extrusion molding is performed using the above-described raw material paste mainly composed of ceramic.
- a ceramic molded body having substantially the same shape as the integrated honeycomb structure of the present invention is manufactured.
- a die used for extrusion molding in which the through hole is composed of two types of through holes, a large volume through hole and a small volume through hole, is selected according to the density of the through holes.
- the raw material paste is not particularly limited, but it is desirable that the integrated her-cum structure of the present invention after manufacture has a porosity of 20 to 80%.
- the ceramic as described above The powder which added the binder, the dispersion medium liquid, etc. to the powder which consists of can be mentioned.
- the binder is not particularly limited, and examples thereof include methyl cellulose, carboxymethyl cellulose, hydroxyethyl cellulose, polyethylene glycol, phenol resin, and epoxy resin.
- the blending amount of the binder is desirably about 1 to 10 parts by weight per 100 parts by weight of the ceramic powder.
- the dispersion medium liquid is not particularly limited, and examples thereof include organic solvents such as benzene, alcohols such as methanol, and water.
- the dispersion medium liquid is blended in an appropriate amount so that the viscosity of the raw material paste is within a certain range.
- a molding aid may be added to the raw material paste as necessary.
- the molding aid is not particularly limited, and examples thereof include ethylene glycol, dextrin, fatty acid sarcophagus, and polyalcohol.
- the raw material paste may be added with a pore-forming agent such as balloons, spherical acrylic particles, and graphite, which are fine hollow spheres containing an acid oxide ceramic as necessary. Good.
- the balloon is not particularly limited, and examples thereof include an alumina balloon, a glass micro balloon, a shirasu balloon, a fly ash balloon (FA balloon), and a mullite balloon. Among these, a fly ash balloon is desirable.
- the ceramic molded body is dried using a microwave dryer, a hot air dryer, a dielectric dryer, a vacuum dryer, a vacuum dryer, a freeze dryer, or the like to obtain a ceramic dried body.
- a microwave dryer a hot air dryer, a dielectric dryer, a vacuum dryer, a vacuum dryer, a freeze dryer, or the like.
- the end of the inlet side through hole group and the end of the outlet side through hole group at the inlet side satisfy the above formula (1) with a sealing material paste as a sealing material A predetermined amount is filled in and the through hole is sealed.
- the above-mentioned sealing material paste is not particularly limited, but it is desirable that the sealing material produced through a subsequent process has a porosity of 20 to 80%.
- the same material paste as above The ceramic powder used in the above raw material paste should be added with ceramic fiber, powder with metal power as described above, lubricant, solvent, dispersant, solder, etc. Is more desirable. This is because it is possible to adjust the heat capacity of the sealing material manufactured through the post-process and to prevent the ceramic particles and the like in the sealing material paste from settling during the sealing process. .
- the ceramic fiber is not particularly limited, and examples thereof include silica alumina, mullite, alumina, silica and the like. These may be used alone
- Two or more kinds may be used in combination.
- the dried ceramic body filled with the sealing material paste is degreased and fired under predetermined conditions to be made of porous ceramic, and the whole is made of a single sintered body.
- An integrated hermetic structure according to the present invention can be manufactured.
- the conditions for degreasing and firing the ceramic dried body the conditions conventionally used for producing a filter made of a porous ceramic can be applied.
- an alumina film having a high specific surface area is formed on the surface of the ceramic fired body obtained by firing. It is desirable to provide a promoter and a catalyst such as platinum on the surface of the membrane.
- the ceramic fired body is impregnated with a solution of a metal compound containing aluminum such as
- Examples thereof include a heating method, a method in which a ceramic fired body is impregnated with a solution containing alumina powder, and a heating method.
- Examples of a method for imparting a cocatalyst to the alumina film include rare earth such as Ce (NO)
- Examples thereof include a method in which a ceramic fired body is impregnated with a solution of a metal compound containing an element and heated.
- a dinitrodiammine platinum nitrate solution [Pt (NH) (NO)] HNO, platinum concentration 4.53 wt%) is used as a ceramic fired body.
- Examples of the method include impregnation and heating.
- the assembly of a plurality of integral-type hard cam structures 20 of the present invention that are bundled via a sealing material layer 14 as shown in FIG. Body type hard cam structure In the case of the structure 10, the sealing material paste layer 81 is formed on the side surface of the integrated hermetic structure 20 by applying a sealing material paste to be the sealing material layer 14 with a uniform thickness, On the seal material paste layer 81, the process of sequentially laminating the other integral type hard structure 20 is repeated to produce a laminate of the prismatic monolithic honeycomb structure 20 having a predetermined size. .
- the description is abbreviate
- the laminated body of the integrated her-cam structure 20 is heated to dry and solidify the sealing material paste layer 81 to form the sealing material layer 14, and then the outer periphery thereof using a diamond cutter or the like.
- the hard cam block 15 is manufactured by cutting the portion into a shape as shown in FIG.
- the sealing material layer 13 is formed on the outer periphery of the her cam block 15 to form the sealing material layer 13, so that a plurality of integrated her cam structures 20 are bound together via the sealing material layer 14.
- the assembled aggregate filter 10 of the present invention can be manufactured.
- the application of the honeycomb structure of the present invention is not particularly limited, but it is desirable to use it for an exhaust gas purification device of a vehicle.
- FIG. 8 is a cross-sectional view schematically showing an example of an exhaust gas purification device for a vehicle in which the her cam structure of the present invention is installed.
- the exhaust gas purifying device 600 mainly includes a her cam structure 60, a casing 630 that covers the outer side of the her cam structure 60, the her cam structure 60 and the casing. 630 and the heating means 610 provided on the exhaust gas inflow side of the her cam structure 60, and the side where the exhaust gas of the casing 630 is introduced
- An inlet pipe 640 connected to an internal combustion engine such as an engine is connected to the end of the casing, and a discharge pipe 650 connected to the outside is connected to the other end of the casing 630.
- the arrows indicate the flow of exhaust gas.
- the her cam structure 60 may be the integrated her cam structure 20 shown in FIG. 1 or the aggregated her cam structure 10 shown in FIG. Good.
- exhaust gas discharged from an internal combustion engine such as an engine is introduced into the casing 630 through the introduction pipe 640, and the inlet side through-hole group 21a Flows into the hard cam structure 60, passes through the partition wall 23, and puts the putty on the partition wall 23. After the particulates are collected and purified, they are discharged out of the hard cam structure 60 from the outlet side through-hole group 21b, and discharged to the outside through the discharge pipe 650.
- the regeneration process of the hard cam structure 60 is performed.
- the gas heated by the heating means 610 is caused to flow into the through-hole of the no-cam structure 60, whereby the her cam structure 60 is heated and the particulates deposited on the partition walls.
- the patty chelate may be removed by combustion using a post-injection method.
- the thickness after drying the sealing material paste having the same composition as that of the formed form was 1. Omm A predetermined through-hole was filled so that
- the porosity is 42%
- the average pore size 9 m is 34.3 mm X 34.3 mm X 150 mm
- the number of through holes 21 is 28 Zcm 2 (large capacity through holes 21a: 14 Zcm 2 , small volume through holes 21b: 14 Zcm 2 )
- the thickness of substantially all of the partition walls 23 is 0.40 mm, and an integral type hard cam structure 20 made of a silicon carbide sintered body is manufactured.
- the large-capacity through hole 21a is formed on the end face on the outlet side. Only the small-volume through hole 21b was sealed with the sealing material at the inlet side end face.
- the total heat capacity measured at 25 ° C of the outlet side sealing material 22 per 11.8 cm 2 of the outlet side end face composed of the outlet side through-hole group is 0.56 J / K.
- the total heat capacity measured at 500 ° C. of the outlet side sealing material 22 per 11.8 cm 2 of the outlet side end face including the outlet side through hole group was 0.91 JZK.
- alumina fiber having a fiber length of 0.2 mm 30% by weight of alumina fiber having a fiber length of 0.2 mm, 21% by weight of silicon carbide particles having an average particle diameter of 0.6 m, 15% by weight of silica sol, 5.6% by weight of carboxymethylcellulose, and 28.4% of water
- a heat-resistant sealing material paste containing% by weight a number of integrated hermetic structures 20 are bundled by the method described with reference to FIG. 8, and then cut using a diamond cutter to obtain a circle.
- a columnar ceramic block 15 was produced.
- the thickness of the sealing material layer 14 for bundling the integrated her-cam structure 20 was adjusted to 1.0 mm.
- an alumina silicate as an inorganic fiber ceramic fiber (shot content: 3%, fiber length: 0. 01- 100mm) 23. 3 weight 0/0, the average particle diameter of 0. 3 m as inorganic particles Silicon carbide powder 30. 2% by weight, silica sol as inorganic binder (contains SiO in sol
- a sealing material paste layer having a thickness of 0.2 mm was formed on the outer periphery of the ceramic block 15 using the sealing material paste. Then, this sealing material paste layer was dried at 120 ° C. to produce a cylindrical aggregated hard structure 10 having a diameter of 143.8 mm and a length of 150 mm.
- the cross-sectional shape perpendicular to the longitudinal direction of the integral type hard cam structure 20 was adjusted by changing the shape of the die when the mixed composition was extruded. Further, the thickness of the sealing material 22 was adjusted by changing the filling amount of the sealing material paste into the through holes 21. [0098] (Evaluation)
- aggregate type c according to each of Examples and Comparative Examples - the cam structure and disposed in an exhaust passage of Enji down the exhaust gas Kiyoshii spoon device, rotational speed 3000 min _1 for the engine, Whether or not cracks occur in the aggregated hard cam structure when an operation is performed for a predetermined time at a torque of 50 Nm, followed by regeneration treatment while increasing the operating time and changing the collection amount.
- a filter composed of an aggregate type hard cam structure according to the example and the comparative example is arranged in an exhaust passage of a direct injection 2L engine, and a cordierite acid catalyst ( ⁇ ) is placed in front of the filter.
- ⁇ cordierite acid catalyst
- 5.66 X 3inch, cell number 400cpsi, wall thickness 8mil, Pt amount 90g / ft 3 ) are used as exhaust gas incubators, and the above engine is operated at a speed of 3000min-torque 50Nm for a predetermined time. A fixed amount of particulate was collected.
- the engine speed was set to 4000 torque 200Nm, and when the filter temperature became constant at around 700 ° C, the engine was forced to burn 1050min—torque 30Nm, and the particulates were forcibly burned.
- An experiment was conducted to perform this regeneration process while changing the amount of particulates collected to investigate whether or not the filter could generate cracks.
- Example 4 10.0 to 38.6 F to 19.79 9. 42 5.
- 80 8. 6 Example 5 20. 0 18. 86 11. 62 8. 5
- Example 6 40. 0 37. 69 23. 22 7.
- 8 Comparative Example 2 60. 0 56. 52 6.4 Comparative Example 3 0. 5 0. 56 0. 34 6.
- 9 Example 7 1.0 1. 11 0. 68 8
- 09 8- 9 Example 9 6. 0 0.64 2.24 6. 75 4. 18 9.5
- Example 10 10 0 -46.51 to 23.71 11.30 6. 96 9.4 Example 11 20. 0 13. 92 9.2 Example 12 40. 0 45. 18 F. 9 Comparative Example 4 60. 0 67. 76 41 .4 4 6 6 Comparative Example 5 0. 5 0.69 0.42 6. 7
- Example 22 10. 0 to 62.90 -31.89 15. 40 04 9. 51 8. 4
- Example 23 20. 0 30. 9 ⁇ 5 ⁇ 19. 07 8. 2
- Example 24 40. 0 61. 86 38. 11 7 8 Comparative Example 8 60. ⁇ 92. 87 57. 22 6. 9
- the aggregate type honeycomb structure according to each example satisfying the relations of the above formulas (1) and (2) had a high regeneration limit value.
- the aggregated hard structure according to each comparative example that does not satisfy the relationship of the above formulas (1) and (2) has a regeneration limit value as soon as a crack is generated at the outlet side sealing portion by the regeneration process. was weak.
- FIG. 1 (a) is a perspective view schematically showing an example of an integrated her-cam structure of the present invention, and (b) is a diagram of the present invention shown in (a).
- FIG. 3 is a cross-sectional view of the body-shaped her cam structure taken along line AA.
- FIG. 2 A cross section perpendicular to the longitudinal direction of the honeycomb structure of the present invention configured such that the number of through holes is substantially 1: 2 between the inlet side through hole group 101 and the outlet side through hole group 102 FIG.
- FIG. 3 (a) and (d) are cross-sectional views schematically showing a cross section perpendicular to the longitudinal direction in the integrated heart structure of the present invention, and (e) is a conventional one.
- FIG. 2 is a cross-sectional view schematically showing a cross section perpendicular to the longitudinal direction in a body-type honeycomb structure.
- FIG. 4 (a) and (f) are cross-sectional views schematically showing a part of a cross section perpendicular to the longitudinal direction in an integrated her-cam structure of the present invention.
- FIG. 5 is a cross-sectional view schematically showing an example of a cross section perpendicular to the longitudinal direction in the integral honeycomb structure of the present invention.
- FIG. 6 (a) and (d) are cross-sectional views schematically showing an example of a cross section perpendicular to the longitudinal direction in an integrated her-cam structure of the present invention.
- FIG. 7 is a perspective view schematically showing an example of an aggregate type hard cam structure of the present invention.
- FIG. 8 is a cross-sectional view schematically showing an example of an exhaust gas purifying device for a vehicle in which the her cam structure of the present invention is installed.
- FIG. 9 is a cross-sectional view schematically showing an example of a conventional honeycomb structure.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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DE602004011378.6T DE602004011378T3 (de) | 2003-10-23 | 2004-10-25 | Wabenstrukturkörper |
EP04792936.9A EP1676622B2 (en) | 2003-10-23 | 2004-10-25 | Honeycomb structure body |
US10/521,592 US7517502B2 (en) | 2003-10-23 | 2004-10-25 | Honeycomb structural body |
PL04792936T PL1676622T3 (pl) | 2003-10-23 | 2004-10-25 | Kształtka o strukturze plastra miodu |
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JP2003363783A JP4439236B2 (ja) | 2003-10-23 | 2003-10-23 | ハニカム構造体 |
JP2003-363783 | 2003-10-23 |
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WO2005039738A1 true WO2005039738A1 (ja) | 2005-05-06 |
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PCT/JP2004/015808 WO2005039738A1 (ja) | 2003-10-23 | 2004-10-25 | ハニカム構造体 |
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US (1) | US7517502B2 (ja) |
EP (1) | EP1676622B2 (ja) |
JP (1) | JP4439236B2 (ja) |
KR (1) | KR100680078B1 (ja) |
CN (1) | CN100346862C (ja) |
AT (1) | ATE383902T1 (ja) |
DE (2) | DE202004021341U1 (ja) |
ES (1) | ES2300840T3 (ja) |
PL (1) | PL1676622T3 (ja) |
WO (1) | WO2005039738A1 (ja) |
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- 2004-10-25 EP EP04792936.9A patent/EP1676622B2/en active Active
- 2004-10-25 US US10/521,592 patent/US7517502B2/en active Active
- 2004-10-25 PL PL04792936T patent/PL1676622T3/pl unknown
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Also Published As
Publication number | Publication date |
---|---|
CN100346862C (zh) | 2007-11-07 |
EP1676622A4 (en) | 2006-09-27 |
DE602004011378T2 (de) | 2008-08-07 |
DE202004021341U1 (de) | 2007-11-15 |
US20060159602A1 (en) | 2006-07-20 |
KR100680078B1 (ko) | 2007-02-09 |
DE602004011378D1 (de) | 2008-03-06 |
JP4439236B2 (ja) | 2010-03-24 |
CN1723070A (zh) | 2006-01-18 |
PL1676622T3 (pl) | 2008-06-30 |
US7517502B2 (en) | 2009-04-14 |
EP1676622B2 (en) | 2020-04-22 |
DE602004011378T3 (de) | 2021-04-22 |
JP2005125237A (ja) | 2005-05-19 |
EP1676622B1 (en) | 2008-01-16 |
ATE383902T1 (de) | 2008-02-15 |
ES2300840T3 (es) | 2008-06-16 |
KR20060008276A (ko) | 2006-01-26 |
EP1676622A1 (en) | 2006-07-05 |
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