WO2013150971A1 - ハニカム構造体 - Google Patents
ハニカム構造体 Download PDFInfo
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- WO2013150971A1 WO2013150971A1 PCT/JP2013/059514 JP2013059514W WO2013150971A1 WO 2013150971 A1 WO2013150971 A1 WO 2013150971A1 JP 2013059514 W JP2013059514 W JP 2013059514W WO 2013150971 A1 WO2013150971 A1 WO 2013150971A1
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- flow path
- honeycomb structure
- wall
- flow paths
- face
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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
- B01D39/2068—Other inorganic materials, e.g. ceramics
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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
- B01D46/2484—Cell density, area or aspect ratio
-
- 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
-
- 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
- B01D46/2459—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the plugs
-
- 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
- B01D46/2474—Honeycomb filters characterized by the geometrical structure, shape, pattern or configuration or parameters related to the geometry of the structure of the walls along the length of the honeycomb
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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
- B01D46/2482—Thickness, height, width, length or diameter
-
- 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
- B01D46/2486—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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/62—Honeycomb-like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/06—Ceramic, e.g. monoliths
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/30—Honeycomb supports characterised by their structural details
- F01N2330/34—Honeycomb supports characterised by their structural details with flow channels of polygonal cross section
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/60—Discontinuous, uneven properties of filter material, e.g. different material thickness along the longitudinal direction; Higher filter capacity upstream than downstream in same housing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a honeycomb structure used as a filter for purifying gas.
- Honeycomb structures are widely used as filters for purifying exhaust gas from internal combustion engines, such as diesel particulate filters (see, for example, Patent Document 1). Since the soot removed from the exhaust gas accumulates on the honeycomb structure, it is necessary to regenerate the filter by burning the soot at regular intervals. In order to burn the soot, it is only necessary to supply a large amount of combustion exhaust gas at a high temperature to ignite the soot and burn out the soot.
- honeycomb structure is heated beyond an allowable amount due to burning of soot during filter regeneration, excessive thermal stress may occur and the honeycomb structure may be damaged. In order to avoid such breakage, there is a need for a technique that moderates soot combustion during filter regeneration.
- the present invention has been made in view of the above problems, and an object thereof is to provide a honeycomb structure capable of mildly burning soot during filter regeneration.
- the present invention provides a first end surface and a second end surface facing each other, a plurality of first flow paths and a plurality of first flow paths extending in a facing direction of the first end surface and the second end surface.
- the first end face side is sealed and the second end face side is opened.
- On the first end face a plurality of first flow paths are provided surrounding the second flow paths, and each first flow path is provided.
- the partition wall is a common wall that separates the first wall that is adjacent on the first end surface and the standard wall that separates the first flow path and the second flow path.
- the standard wall thickness is greater than the common wall thickness.
- the honeycomb structure since the thickness of the standard wall is larger than the thickness of the common wall, compared to the case where the thickness of the standard wall is equal to the thickness of the common wall, It becomes difficult for the gas flowing into the first flow path to pass through the standard wall. Therefore, according to the honeycomb structure, even when the high-temperature gas flows into the first flow path during filter regeneration and combustion of soot occurs, the combustion gas (carbon dioxide gas or the like) generated by the combustion passes through the standard wall and passes through the standard wall. Since it is difficult to be discharged into the two flow paths and the further oxygen supply is suppressed by the influence of the combustion gas staying in the first flow path, combustion of soot can be suppressed to make it mild. As a result, since the honeycomb structure is heated beyond the allowable amount, damage due to excessive thermal stress can be avoided, so that the reliability of the honeycomb structure can be improved.
- the honeycomb structure according to the present invention, five or more first flow paths are provided on the first end surface so as to surround the second flow path, and each of the five or more first flow paths is provided in the first end surface. You may arrange
- the thickness of all standard walls between one second flow path and each first flow path surrounding the second flow path is equal to each second flow path surrounding the second flow path. It may be larger than the thickness of all the common walls between one flow path. According to the above honeycomb structure, all the standard walls around the second flow path are formed thicker than all the common walls between the first flow paths surrounding the second flow path. Combustion gas is less likely to be discharged from the flow path to the second flow path, and soot combustion can be made milder.
- the area in the first flow path formed by the common wall is smaller than the area in the first flow path formed by the standard wall. Also good.
- the soot layer is deposited thicker on the common wall than the standard wall. Therefore, in the above honeycomb structure, even if soot is burnt in the first flow path during filter regeneration, the soot layer thickly deposited on the common wall does not easily burn, and soot is burnt all at once in a short time. Can be avoided, so that the burning of soot can be made milder.
- honeycomb structure according to the present invention can mildly burn soot during filter regeneration.
- FIG. 2 is a cross-sectional view taken along line II-II in FIG. It is an enlarged view for demonstrating arrangement
- the honeycomb structure 100 As shown in FIGS. 1 and 2, the honeycomb structure 100 according to the first embodiment is a cylindrical structure used as a filter for purifying exhaust gas from an internal combustion engine such as a diesel engine or a gasoline engine. It is.
- the columnar honeycomb structure 100 includes a first end surface 100 a and a second end surface 100 b facing each other, and partition walls 112 that form a plurality of flow paths 110.
- the plurality of flow paths 110 include a first flow path 110a that is open on the first end face 100a side and sealed on the second end face 100b side, and a second end that is sealed on the first end face 100a side. And the second flow path 110b having an open end face 100b side.
- the plurality of first flow paths 110a and the plurality of second flow paths 110b are flow paths extending in the opposing direction of the first end face 100a and the second end face 100b, and have a regular hexagonal cross-sectional shape (flow paths 110a, 110b (cross-sectional shape perpendicular to the extending direction of 110b).
- the first flow path 110a and the second flow path 110b are arranged on the first end face 100a so that the first flow path 110a surrounds the second flow path 110b. Specifically, on the first end face 100a, six adjacent first flow paths 110a are disposed so as to surround one second flow path 110b. The six first channels 110a are arranged adjacent to one second channel 110b.
- the honeycomb structure 100 configured as described above has, for example, the exhaust gas flow of the internal combustion engine with the first end face 100a as the gas upstream side (internal combustion engine side) and the second end face 100b as the gas downstream side (exhaust side). Located on the road.
- the main flow of exhaust gas passing through the honeycomb structure 100 functioning as a filter is indicated by an arrow G.
- the exhaust gas of the internal combustion engine first flows into the first flow path 110a from the opening on the first end face 100a side.
- the gas that has flowed into the flow path 110a passes through the partition wall 112 and flows into the second flow path 110b because the second end face 100b side of the flow path 110a is sealed.
- soot in the exhaust gas is captured by the partition 112.
- the gas from which the soot has been removed flows through the second flow path 110b and flows out from the opening on the second end face 100b side.
- the honeycomb structure 100 functioning as a filter is composed of a porous (for example, an average pore diameter of 20 ⁇ m or less) ceramic material or the like.
- a porous ceramic material or the like examples include alumina, silica, mullite, cordierite, glass, oxides such as aluminum titanate, silicon carbide, silicon nitride, and metal.
- the aluminum titanate can further contain magnesium and / or silicon.
- Such a honeycomb structure 100 can be obtained by extruding the green molded body (unfired molded body) to be the ceramic material described above after firing and then performing a predetermined sealing process.
- a green molded object contains the inorganic compound source powder which is a ceramic raw material, organic binders, such as methylcellulose, and the additive added as needed.
- the inorganic compound source powder includes an aluminum source powder such as ⁇ -alumina powder, and a titanium source powder such as anatase-type or rutile-type titania powder. Further, magnesium source powder such as magnesia powder and magnesia spinel powder, and / or silicon source powder such as silicon oxide powder and glass frit can be included.
- organic binder examples include celluloses such as methylcellulose, carboxymethylcellulose, hydroxyalkylmethylcellulose, and sodium carboxymethylcellulose; alcohols such as polyvinyl alcohol; and lignin sulfonate.
- additives include a pore-forming agent, a lubricant, a plasticizer, a dispersant, and a solvent.
- Examples of the pore-forming agent include carbon materials such as graphite; resins such as polyethylene, polypropylene and polymethyl methacrylate; plant materials such as starch, nut shells, walnut shells and corn; ice; and dry ice.
- Lubricants and plasticizers include alcohols such as glycerin; higher fatty acids such as caprylic acid, lauric acid, palmitic acid, arachidic acid, oleic acid and stearic acid; stearic acid metal salts such as Al stearate, polyoxyalkylene alkyl And ether (POAAE).
- alcohols such as glycerin
- higher fatty acids such as caprylic acid, lauric acid, palmitic acid, arachidic acid, oleic acid and stearic acid
- stearic acid metal salts such as Al stearate, polyoxyalkylene alkyl And ether (POAAE).
- dispersant examples include inorganic acids such as nitric acid, hydrochloric acid and sulfuric acid; organic acids such as oxalic acid, citric acid, acetic acid, malic acid and lactic acid; alcohols such as methanol, ethanol and propanol; ammonium polycarboxylate Surfactant etc. are mentioned.
- solvent for example, alcohols such as methanol, ethanol, butanol and propanol; glycols such as propylene glycol, polypropylene glycol and ethylene glycol; and water can be used.
- the same material as that of the green molded body described above may be used, or a different material may be used.
- a material through which exhaust gas from the internal combustion engine cannot pass can also be used.
- FIG. 3 is a view for explaining the arrangement of the flow path 110 on the first end face 100a.
- FIG. 3 shows the flow paths 121 and 122 of the plurality of first flow paths 110a and the flow path 123 of the plurality of second flow paths 110b as examples.
- the partition 112 separates the standard wall 112 a that separates the adjacent first flow paths 121 and 122 and the second flow path 123 from the two adjacent first flow paths 121 and 122. And a common wall 112b.
- the first flow paths 121 and 122 are formed of the standard wall 112a and the common wall 112b, and the second flow path 123 is formed of only the standard wall 112a.
- the thickness t s of the standard wall 112a is formed to be larger than the thickness t c of the common wall 112b. That is, the distance between the first flow paths 121 and 122 and the second flow path 123 is formed to be larger than the distance between the first flow paths 121 and 122. Therefore, as compared with the case where the thickness t s of the standard wall 112a is equal to the thickness t c of the common wall 112b, hard gas in the first flow path 121 and 122 flows into the second flow path 123.
- all the standard walls 112a between the plurality of first flow paths 110a and the second flow paths 123 surrounding the second flow path 123 are provided.
- the thickness is formed larger than the thickness of all the common walls 112b between the first flow paths 110a adjacent on the first end face 100a. It is preferable that the thickness t s of the standard wall 112a and the thickness t c of the common wall 112b satisfy the relationship of 0.1 ⁇ t c /ts ⁇ 0.9.
- the exhaust gas flowing into the first flow paths 121 and 122 from the opening of the first end face 100a passes through the standard wall 112a and enters the second flow path 123, thereby opening the second end face 100b. Is discharged to the outside.
- soot contained in the exhaust gas is supplemented by the standard wall 112a, so that the soot layer Sa shown in FIG. 3 is formed.
- the soot layer Sa is formed on the standard wall surfaces 121 a and 122 a of the first flow paths 121 and 122.
- the standard wall surface 121a is a surface formed by the standard wall 112a in the first flow path 121
- the standard wall surface 122a is a surface formed by the standard wall 112a in the first flow path 122.
- the second flow path 123 has standard wall surfaces 123a and 123b formed by the standard wall 112a.
- the standard wall surface 123a of the second flow path 123 is a surface facing the standard wall surface 121a of the first flow path 121 with the standard wall 112a interposed therebetween.
- the standard wall surface 123b of the second flow path 123 is a surface facing the standard wall surface 122a of the first flow path 122 with the standard wall 112a interposed therebetween.
- a portion of the partition wall 112 sandwiched between the standard wall surfaces 121a and 122a of the first flow paths 121 and 122 and the standard wall surfaces 123a and 123b of the second flow path 123 constitutes the standard wall 112a.
- the thickness t s of the standard wall 112a is a standard wall 121a of the first flow path 121 and 122, 122a and the standard wall 123a of the second flow path 123, which corresponds to the distance between 123b.
- the soot layer Sb is formed on the common wall surfaces 121b, 122b of the first flow paths 121, 122.
- the common wall surface 121b is a surface formed by the common wall 112b in the first flow path 121
- the common wall surface 122b is a surface formed by the common wall 112b in the first flow path 122.
- the common wall surface 121b and the common wall surface 122b are opposed to each other with the common wall 112b interposed therebetween.
- a portion of the partition wall 112 sandwiched between the common wall surface 121b and the common wall surface 122b constitutes the common wall 112b.
- the thickness t c of the common wall 112b corresponds to the interval between the common wall surface 121b and the common wall surface 122b.
- illustration is abbreviate
- filter regeneration for recovering the filter function is performed by burning the soot layers Sa, Sb and the like with a high-temperature gas.
- An example of hot gas flow during filter regeneration is shown as arrows A and B.
- the thickness ts of the standard wall 112a is formed larger than the thickness t c of the common wall 112b, the thickness ts of the standard wall 112a Compared with the case where the thickness t c of the common wall 112b is equal, the gas flowing into the first flow path 110a from the opening of the first end face 100a is less likely to pass through the standard wall 112a, and is opened at the second end face 100b. It becomes difficult to enter the second flow path 110b.
- honeycomb structure 100 even when high-temperature gas flows into the first flow path 110a during filter regeneration and combustion of soot occurs, combustion gas (carbon dioxide gas or the like) generated by combustion passes through the standard wall 112a.
- combustion gas carbon dioxide gas or the like
- the honeycomb structure 100 is heated beyond an allowable amount, damage due to excessive thermal stress can be avoided, so that the reliability of the honeycomb structure 100 can be improved.
- the six first flow paths 110a are arranged so as to surround the one second flow path 110b and adjacent to the second flow path 110b, so that The flow path 110 having a cross-sectional shape can be efficiently arranged with a high aperture ratio.
- the honeycomb structure 101 according to the second embodiment is different from the honeycomb structure 100 according to the first embodiment in the cross-sectional shape of the first flow path.
- FIG. 4 is a view showing a part of the first end face 101a of the honeycomb structure 101 according to the second embodiment.
- the plurality of flow paths 130 of the honeycomb structure 101 according to the second embodiment are opened on the first end face 101 a side and sealed on the second end face side (not shown).
- the first flow path 130a and the second flow path 130b in which the first end face 101a side is sealed and the second end face side is opened are divided.
- the second flow path 130 b is sealed with a sealing material 134.
- the first flow path 130a and the second flow path 130b are arranged on the first end surface 101a so that the first flow path 130a surrounds the second flow path 130b. Specifically, on the first end face 101a, six adjacent first flow paths 130a are arranged so as to surround one second flow path 130b. The six first flow paths 130a are arranged so as to be adjacent to one second flow path 130b.
- the second channel 130b is a channel having the same regular hexagonal cross-sectional shape as the first embodiment.
- the first flow path 130a has a regular hexagonal shape (for example, a short side facing one side of the regular hexagonal cross section of the adjacent second flow path 130b, and a long side longer than the short side. Hexagonal shape in which the side and the short side are arranged to face each other.
- the long sides of the regular hexagonal cross section of the six first flow paths 130a are opposed to the sides of the regular hexagonal cross section of the second flow path 130b. Is arranged.
- FIG. 5 is a diagram for explaining the arrangement of the flow path 130 in the first end face 101a.
- FIG. 5 shows the flow paths 131 and 132 of the plurality of first flow paths 130a and the flow path 133 of the plurality of second flow paths 130b as examples.
- the partition wall 135 separates the standard wall 135 a that separates the adjacent first flow paths 131 and 132 and the second flow path 133 from the two adjacent first flow paths 131 and 132. And a common wall 135b.
- the first flow paths 131 and 132 are flow paths formed from the standard wall 135a and the common wall 135b, and the second flow path 133 is a flow path formed only from the standard wall 135a.
- the honeycomb structure 101 according to the second embodiment is formed such that the thickness t s of the standard wall 135a is larger than the thickness t c of the common wall 135b. That is, the distance between the first flow paths 131 and 132 and the second flow path 133 is formed to be larger than the distance between the first flow paths 131 and 132.
- the area of the common wall surface 131b of the first flow path 131 is formed smaller than the area of the standard wall surface 131a. That is, of the standard wall 135a and the common wall 135b that form the first flow path 131, the area formed by the common wall 135b is smaller than the area formed by the standard wall surface 131a. This means that the area of the standard wall surface 131a serving as the outlet for the soot combustion gas is larger than the common wall surface 131b on which soot accumulates.
- the thickness t s of the standard wall 135a between the standard wall 133a of the standard wall 131a and the second flow path 133 of the first passage 131 is uniform Yes, and formed larger than the thickness t c of the common wall 135b.
- the thickness t s of the standard wall 135a is formed larger than the thickness t c of the common wall 135b, and thus the thickness t of the standard wall 135a.
- the combustion gas in the first flow paths 131 and 132 is less likely to pass through the standard wall 135a as indicated by the arrow B during filter regeneration. Therefore, according to the honeycomb structure 101 according to the second embodiment, further oxygen supply into the first flow paths 131 and 132 is suppressed for the same reason as the honeycomb structure 100 according to the first embodiment. Therefore, it can be made mild by suppressing burning of soot.
- the area of the common wall surface 131b forming the first flow path 131 is smaller than the area of the standard wall surface 131a. Thickly deposited on the common wall 131b. For this reason, even if the hot gas flows into the first flow path 131 during filter regeneration and the soot is burned from the surface side of the soot layer Sb as shown by the arrow A, the soot layer Sb that has accumulated thickly does not easily burn. Can be prevented from burning all at once in a short time, and soot burning can be made milder.
- the honeycomb structure 101 according to the second embodiment employs an asymmetric cell structure (asymmetric lattice structure) having flow passages having different cross-sectional shapes, the per-filter unit volume per unit volume is compared with the symmetric cell structure.
- the filter area can be increased. This reduces the pressure loss of the exhaust gas, which is advantageous for improving the fuel consumption of the internal combustion engine.
- the honeycomb structure 102 according to the third embodiment is different from the honeycomb structure 101 according to the second embodiment in the cross-sectional shape of the first flow path 140a.
- FIG. 6 is a view showing a part of the first end face 102a of the honeycomb structure 102 according to the third embodiment.
- the first flow path 140a of the honeycomb structure 102 has a flat hexagonal shape (for example, a regular hexagonal cross section of the adjacent second flow path 140b). It has a long side that faces one side and a short side that is shorter than the long side, and two long sides and four short sides are arranged opposite each other. is doing.
- the first flow path 140a and the second flow path 140b are arranged so that the long sides of the flat hexagonal cross section of the six first flow paths 140a face each side of the regular hexagonal cross section of the second flow path 140b. Has been placed.
- the thickness of the standard wall 145a is formed to be larger than the thickness of the common wall 145b as in the first embodiment.
- the standard wall 145a is a partition corresponding to the short side of the flat hexagonal cross section
- the common wall 145b is a partition corresponding to the short side of the flat hexagonal cross section.
- the standard wall 145a and the common wall 145b that form the first flow path 140a are standard.
- the area formed by the common wall 145b is smaller than the area formed by the wall surface 141a.
- honeycomb structure 102 according to the third embodiment described above the same effect as that of the honeycomb structure 101 according to the second embodiment can be obtained.
- the shape of the honeycomb structure is not limited to a cylindrical shape, and the cross section may be a columnar shape such as an ellipse or a polygon.
- the cross-sectional shape of the flow path is not limited to a hexagonal shape, and may be other polygonal shapes, circular shapes, elliptical shapes, or the like.
- the cross-sectional shape of the plurality of first flow paths may be different from the cross-sectional shape of the plurality of second flow paths, and the cross-sectional shapes of the plurality of first flow paths (or the plurality of second flow paths) are different.
- a flow path may be included.
- first flow paths may be provided on the first end surface so as to surround one second flow path, and may be disposed adjacent to the second flow path.
- the area of the common wall surface forming the first flow path is smaller than the area of the standard wall surface.
- the area of the common wall surface forming the first flow path is the area of the standard wall surface. May be larger.
- the thickness of the standard wall may be different depending on the location, and the thickness of the common wall may be different depending on the location.
- the minimum thickness of all the standard walls forming one second flow path only needs to be larger than the maximum thickness of all the common walls between the first flow paths surrounding the second flow path.
- the present invention can be used for a honeycomb structure that can mildly burn soot during filter regeneration.
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- Physics & Mathematics (AREA)
- Geometry (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Filtering Materials (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
Description
上記ハニカム構造体によれば、開口率の高い効率的な流路の配置が可能になる。
上記ハニカム構造体によれば、第2流路の周りの全ての標準壁が当該第2流路を囲む各第1流路の間の全ての共通壁より厚く形成されているので、各第1流路から第2流路に燃焼ガスが排出されにくくなり、煤の燃焼をより一層マイルドにすることができる。
上記ハニカム構造体によれば、第1流路を形成する共通壁の面積が標準壁の面積よりも小さいので、煤の層は標準壁と比べて共通壁に厚く堆積する。従って、上記ハニカム構造体では、フィルタ再生時に第1流路内で煤の燃焼が生じても、共通壁に厚く堆積した煤の層の燃焼は進みにくく、煤が短時間で一斉に燃焼することが避けられるので、煤の燃焼をより一層マイルドにすることができる。
図1及び図2に示されるように、第1の実施形態に係るハニカム構造体100は、例えばディーゼルエンジン、ガソリンエンジン等の内燃機関の排出ガスを浄化するフィルタとして利用される円柱状の構造体である。円柱状のハニカム構造体100は、互いに対向する第1の端面100a及び第2の端面100bと、複数の流路110を形成する隔壁112と、を有している。
第2の実施形態に係るハニカム構造体101は、第1の実施形態に係るハニカム構造体100と比べて、第1流路の断面形状が異なっている。図4は、第2の実施形態に係るハニカム構造体101の第1の端面101aの一部を示す図である。
第3の実施形態に係るハニカム構造体102は、第2の実施形態に係るハニカム構造体101と比べて、第1流路140aの断面形状が異なっている。図6は、第3の実施形態に係るハニカム構造体102の第1の端面102aの一部を示す図である。
Claims (4)
- 互いに対向する第1の端面及び第2の端面と、前記第1の端面及び前記第2の端面の対向方向で延在する複数の第1流路及び複数の第2流路を形成する隔壁と、を有するハニカム構造体であって、
前記複数の第1流路は、前記第1の端面側が開口され、前記第2の端面側が封口されており、
前記第2流路は、前記第1の端面側が封口され、前記第2の端面側が開口されており、
前記第1の端面上で、前記複数の第1流路は、前記第2流路を囲んで設けられると共に、各前記第1流路が前記第2流路と隣り合って配置されており、
前記隔壁は、前記第1流路及び前記第2流路を隔てる標準壁と、前記第1の端面上で隣り合う二個の前記第1流路を隔てる共通壁と、を含み、
前記標準壁の厚さが前記共通壁の厚さより大きいハニカム構造体。 - 前記第1の端面上で、五個以上の前記第1流路が、前記第2流路を囲んで設けられると共に、当該五個以上の第1流路の各々が前記第2流路と隣り合って配置されている、請求項1に記載のハニカム構造体。
- 一つの前記第2流路と当該第2流路を囲む各前記第1流路との間の全ての前記標準壁の厚さが、当該第2流路を囲む各前記第1流路の間の全ての前記共通壁の厚さより大きい、請求項1又は2に記載のハニカム構造体。
- 前記第1流路を形成する前記隔壁のうち、前記標準壁によって形成される前記第1流路内の面積より前記共通壁によって形成される前記第1流路内の面積が小さい、請求項1~3のうち何れか一項に記載のハニカム構造体。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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KR1020147030431A KR20140141702A (ko) | 2012-04-05 | 2013-03-29 | 허니컴 구조체 |
US14/390,159 US20150059306A1 (en) | 2012-04-05 | 2013-03-29 | Honeycomb structure |
CN201380018338.3A CN104271216A (zh) | 2012-04-05 | 2013-03-29 | 蜂窝结构体 |
EP13773123.8A EP2835166A4 (en) | 2012-04-05 | 2013-03-29 | hONEYCOMB STRUCTURE |
MX2014011907A MX2014011907A (es) | 2012-04-05 | 2013-03-29 | Estructura de panal de miel. |
ZA2014/07429A ZA201407429B (en) | 2012-04-05 | 2014-10-14 | Honeycomb structure |
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JP2012086473 | 2012-04-05 | ||
JP2012-086473 | 2012-04-05 |
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WO2013150971A1 true WO2013150971A1 (ja) | 2013-10-10 |
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PCT/JP2013/059514 WO2013150971A1 (ja) | 2012-04-05 | 2013-03-29 | ハニカム構造体 |
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US (1) | US20150059306A1 (ja) |
EP (1) | EP2835166A4 (ja) |
JP (1) | JP2013230461A (ja) |
KR (1) | KR20140141702A (ja) |
CN (1) | CN104271216A (ja) |
MX (1) | MX2014011907A (ja) |
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WO2014054159A1 (ja) | 2012-10-04 | 2014-04-10 | イビデン株式会社 | ハニカムフィルタ |
CN108883376A (zh) * | 2016-03-31 | 2018-11-23 | 日本碍子株式会社 | 整体型分离膜结构体 |
JP2018167200A (ja) * | 2017-03-30 | 2018-11-01 | 日本碍子株式会社 | ハニカムフィルタ |
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- 2013-03-29 MX MX2014011907A patent/MX2014011907A/es unknown
- 2013-03-29 WO PCT/JP2013/059514 patent/WO2013150971A1/ja active Application Filing
- 2013-03-29 CN CN201380018338.3A patent/CN104271216A/zh active Pending
- 2013-03-29 KR KR1020147030431A patent/KR20140141702A/ko not_active Application Discontinuation
- 2013-03-29 US US14/390,159 patent/US20150059306A1/en not_active Abandoned
- 2013-03-29 EP EP13773123.8A patent/EP2835166A4/en not_active Withdrawn
- 2013-04-05 JP JP2013079837A patent/JP2013230461A/ja active Pending
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KR20140141702A (ko) | 2014-12-10 |
ZA201407429B (en) | 2016-08-31 |
US20150059306A1 (en) | 2015-03-05 |
EP2835166A4 (en) | 2016-02-17 |
CN104271216A (zh) | 2015-01-07 |
JP2013230461A (ja) | 2013-11-14 |
MX2014011907A (es) | 2014-11-12 |
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