Classifications

• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J35/00—Catalysts, in general, characterised by their form or physical properties
  • B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
  • B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
  • B01J35/57—Honeycombs
• • 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
  • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
  • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
  • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
  • F01N3/28—Construction of catalytic reactors
  • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
  • F01N3/2807—Metal other than sintered metal
  • F01N3/281—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
• • 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
  • F01N2330/02—Metallic plates or honeycombs, e.g. superposed or rolled-up corrugated or otherwise deformed sheet metal
• • 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
  • F01N2330/32—Honeycomb supports characterised by their structural details characterised by the shape, form or number of corrugations of plates, sheets or foils
• • 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
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S55/00—Gas separation
  • Y10S55/30—Exhaust treatment
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/12—All metal or with adjacent metals
  • Y10T428/1234—Honeycomb, or with grain orientation or elongated elements in defined angular relationship in respective components [e.g., parallel, inter- secting, etc.]
• • 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
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24149—Honeycomb-like

Definitions

• the present invention relates to a metallic honeycomb body, in particular for the purification of exhaust gas of an internal combustion engine.
• a special field of application is the purification of an exhaust gas from particles.
• An early design for which the DE 29 02 779 Al shows typical examples, is the spiral design, in which essentially a smooth and a corrugated sheet are superimposed and wound spirally.
• the honeycomb body is constructed of a plurality of alternately arranged smooth and corrugated or differently corrugated sheets, wherein the sheets first form one or more stacks, which are entwined with each other.
• the ends of all sheets come to lie outside and can be connected to a housing or casing tube, whereby numerous connections arise, which increase the durability of the honeycomb body.
• Typical examples of these types are described in EP 0 245 737 B1 or WO 90/03220. It has also long been known to provide the sheets with additional structures in order to influence the flow and / or to achieve a cross-mixing between the individual flow channels. Typical examples of such embodiments are WO 91/01178, WO 91/01807 and WO 90/08249.
• honeycomb bodies in a conical design possibly also with additional additional structures for flow control. Such a honeycomb body is described, for example, in WO 97/49905.
• honeycomb bodies have a multiplicity of at least partially structured sheet-metal layers whose structuring forms channels which are separated from an entry surface lead to an exit surface of the honeycomb body.
• sheet metal layers the successive layers of the honeycomb body are meant, regardless of whether these sheet metal layers consist of one or more separate sheets. It should be noted that it is in principle possible to build a honeycomb body from only a single sheet by z. B. a part of the metal strip corrugated and the remaining smooth part of the metal strip is folded by bending it. The resulting structure can be spirally wound from the bending line to a honeycomb body. The next possibility is to use a smooth and a corrugated sheet for producing a spirally wound honeycomb body. Also multi-start spirals of three or more sheets are possible.
• honeycomb bodies contain a plurality of sheets, but the number of sheets and the number of superimposed sheet metal layers also need not necessarily be the same. For this reason, a distinction in principle between a sheet and a sheet-metal layer, even if this is often not possible, for example, in drawings showing only a section of a honeycomb body.
• honeycomb bodies in an exhaust gas stream which contains soot particles, can become clogged completely or partially by deposited soot particles. This impairs the regular function, in particular as a soot filter, and / or makes regeneration more difficult.
• Object of the present invention is therefore to provide a honeycomb body, in which there is a reduced probability for the deposition of soot particles on the end faces.
• a honeycomb body according to claim 1.
• One reason for the deposition of soot particles on the front side of a honeycomb body is the fact that the end faces of the honeycomb body structure are perpendicular to the flow direction. Soot particles bounce almost exactly perpendicular to the end faces of the honeycomb body. By creating a rugged structure at the entrance end, two things are achieved simultaneously.
• considerable parts of the end face of the honeycomb body are now no longer exactly perpendicular to the flow direction, on the other hand, the course of the flow upon entry into the individual channels is so influenced that only a few particles can strike the face frontally.
• any resulting soot deposits are already partially in the interior of the channels, so that a catalytic reaction can be easily initiated by contact with catalytically coated channel walls in motion. Any resulting deposits can therefore be easily removed again.
• An inventive honeycomb body is therefore wound from sheets, looped and / or layered with a plurality of at least partially structured Sheet metal layers whose Strulcturierang channels forms, which run from an inlet end face to an exit end face of the honeycomb body.
• at least a part of the sheet metal layers at the inlet end side and / or the outlet end side have recesses at their edges, so that a ragged structure of the inlet end side or outlet front side results.
• honeycomb bodies are constructed of alternating layers of essentially smooth and corrugated glass, it being possible according to the invention for only the smooth sheets to have only the corrugated sheets or both recesses.
• honeycomb bodies which are designed as particle filters, in particular for removing soot particles, often a part of the sheet metal layers of porous material, in particular of compacted metal fibers.
• sheets it is therefore also possible for sheets to consist of porous material, in particular fiber material.
• the invention is applicable to virtually all known metallic honeycomb bodies, which are constructed from one or more sheets, regardless of which additional openings, structures or other special features such honeycomb body.
• Sheet metal layers for example, 5%, preferably more than 10% of the theoretically possible through the structured sheet metal layers contact points between the
• Sheet metal layers are soldered and soldered with conventional methods, since these contact points are not those of honeycomb bodies with smooth end faces
• the compound is applied to honeycomb bodies formed of one or more stacks of sheets, the sheets of each stack having a predetermined length and width, the length being greater than the width, and the sheets of each stack being respectively many Have recesses over the length.
• the recesses are thus located on the longitudinal sides of the sheets, while the broadsides are preferably, but not necessarily, formed without recesses. Since the broadsides typically have to be connected to the jacket tube during the completion of a honeycomb body, recesses are not necessarily advantageous here.
• the recesses have rounded boundary lines, whereby notch effects, ie the tearing of the sheet metal edges in the region of the recesses, are largely avoided.
• Recesses in the form of circular sections are particularly preferred. Since particle filter z. B. also be made of perforated sheet metal layers, where appropriate, even the machines with which holes are produced in the sheet metal layers anyway, can also be used to produce the recesses at the edges of the sheet metal layers. It is even possible to evenly provide wide metal strips with holes and then to snow the metal strips to the desired width, wherein preferably the cutting lines should run through the middle of rows of holes. In order to achieve the desired effect of preventing soot deposits on the end faces, it is advantageous if more than 80% of the channels terminate on at least one end face of a honeycomb body according to the invention in the region of at least one recess. Even more preferably, it should be more than 90% of the channels. In this way it can be ensured that local accumulations of soot on the front side are avoided.
• a honeycomb body which has at least one cavity at the inlet end face.
• This cavity is preferably arranged centrically and in particular has a conically tapering section.
• honeycomb body in which a part of the channels is closed near the exit end face.
• closure of the channels can be accomplished by compressing the channel walls and / or by providing a blockage.
• at least part of the channels arranged on the outer edge of the honeycomb body are closed, so that a forced flow within the honeycomb body through the recesses passes into internal partial volumes.
• this has a plurality of sub-volumes which have a mutually different number of channels per unit cross-sectional area.
• a coaxial arrangement (for example for cylindrical configurations of the honeycomb body) of two partial volumes is preferred.
• honeycomb bodies according to the invention is primarily the cleaning of the exhaust gas of internal combustion engines, in particular diesel engines, in particular, the elimination of soot particles from the exhaust gas is in the foreground here.
• FIG. 1 is a schematic view of a honeycomb body according to the invention during the manufacturing process
• FIG. 3 is a perspective schematic view of a small frontal section of a honeycomb body according to the invention.
• FIG. 5 schematically shows the use of a honeycomb body according to the invention in the exhaust system of an internal combustion engine
• Fig. 6 shows a further embodiment variant of a honeycomb body according to the invention.
• Fig. 7 shows yet another embodiment variant of a honeycomb ⁇ body according to the invention.
• Fig. 1 shows a honeycomb body 1 schematically during the manufacturing process.
• the honeycomb body 1 is constructed from a structured sheet 2 and a smooth sheet 3, wherein the structured sheet 2 has recesses 9 at both longitudinal edges. Even the smooth sheet 3 with the width B and the length L has at its front edges 8 over the length L many Aussparun-
• the boundary lines 12 of these recesses 10 are rounded, so that the recesses 10 have approximately the shape of circular segments.
• the channels 4 of the honeycomb body 1 form, in spite of the recesses 9, 10 still enough frontal Kunststoffsstel- len 11 between the smooth and corrugated sheet metal layers 2, 3 arise.
• the finished honeycomb body later has a fissured inlet end face 5 and a jagged exit end face 6, however, still sufficient solder joints 11 can still be soldered together by conventional methods if required.
• FIG. 2 shows a corrugated sheet 2 having the width B suitable for constructing a honeycomb body according to the invention.
• the inlet end face 5 has recesses 9, while the exit end face 6 has an edge strip 15 without recesses.
• the front edge 7 of the corrugated sheet 2 has recesses 9 with circular section boundary lines 12.
• the exact shape of the openings 13 and recesses 9 is not important, but it may be advantageous to choose the shapes so that the projection of these openings or recesses on the center plane of the structured sheet 2 circular or circular section - is shaped.
• FIG. 3 shows, in a schematic perspective illustration, the typical conditions in a particle filter in which the exhaust gas is directed through deflection structures 14 through a porous smooth layer 3 of metal fibers 16.
• the flow paths 19 are indicated by arrows.
• soot particles 17 are directed to the porous sheet-metal layer 3, held there and implemented.
• the attachment of soot particles 17 on the front-side sheet edge 7 of the structured sheet 2 or the frontal sheet edge 8 of the smooth sheet 3 by means of outsourcing rangen 10 in the smooth sheet 3 can be reduced.
• the line of reference 12 of the recess 10 has approximately the shape of a circular section. you recognizes that the recess 10 influences the flow conditions when entering the flow in the adjacent channels 4 and thus accumulation of particles is less probable.
• Fig. 4 shows schematically various ways of designing the edges of a sheet with recesses.
• an end-side sheet edge 8 of the smooth sheet 3 is provided with individual recesses 10, while the opposite sheet edge has the shape of a wavy line 18.
• a wavy line 18 should be considered in the context of the present invention as a sheet edge with recesses.
• FIG. 1 A typical installation situation of a honeycomb body 1 according to the invention is shown in FIG. From an internal combustion engine 20, exhaust gases pass into an exhaust system 21, which has the honeycomb body 1 according to the invention and, if appropriate, further components, in particular a downstream oxidation catalyst 22.
• Fig. 6 shows a, placed in a housing 23, honeycomb body 1, which has a centrally disposed cavity 25 at the inlet end face 5.
• This cavity 25 has a conically tapered portion.
• the ducts 4 of different lengths due to the cavity 25 cause pressure differences, so that the exhaust gas arriving with the illustrated flow direction 24 is deflected in the interior of the honeycomb body, as shown diagrammatically by the arrows.
• a part of the channels 4 close to the exit end face 6 is closed by means of an annular blockage 26.
• honeycomb bodies 1 are shown in a housing 23, each having two concentric partial volumes 27, 28, which have a different number of channels 4 per unit cross-sectional area.
• the honeycomb bodies 1 are separated from one another by a gap 29, for example smaller than 10 mm. the spaced and have an inverse arrangement of the Teüvolumen 27, 28, so that the partial volume 27 with a high channel density of the first honeycomb body with the partial volume 28 with lower channel density of the second honeycomb body are opposite (as seen in the flow direction 24).
• the illustrated variant is preferred, in which the first honeycomb body has a first part volume 27 with a high channel density on the outside.
• the first partial volume 27 has a channel density which is at least a factor of 1.5 greater than that of the second partial volume 28.
• the first partial volume has a channel density in the range of at least 800 cpsi (cells per square inch; 6.4516 cells per square centimeter).
• At least one support element 30 is provided at least partially between the partial volumes 27, 28.
• this support member 30 may be, for example, a pipe section.
• the present invention serves to further improve metallic honeycomb bodies when used as exhaust gas purification components, in particular for the removal of pollutant particles from an exhaust gas.
• the invention prevents or reduces the deposition of particles, in particular soot, on the end faces of a honeycomb body.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Combustion & Propulsion (AREA)
• Toxicology (AREA)
• Health & Medical Sciences (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Exhaust Gas After Treatment (AREA)
• Filtering Of Dispersed Particles In Gases (AREA)
• Filtering Materials (AREA)
• Processes For Solid Components From Exhaust (AREA)

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Citations (4)

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• 2005
  • 2005-02-28 DE DE102005009585A patent/DE102005009585A1/de not_active Withdrawn
• 2006
  • 2006-02-23 EP EP08022397A patent/EP2058482A1/de not_active Withdrawn
  • 2006-02-23 EP EP06707217A patent/EP1853800B1/de not_active Not-in-force
  • 2006-02-23 KR KR1020077022088A patent/KR20070108262A/ko not_active Ceased
  • 2006-02-23 CN CN2006800063269A patent/CN101128655B/zh not_active Expired - Fee Related
  • 2006-02-23 DE DE502006004511T patent/DE502006004511D1/de active Active
  • 2006-02-23 RU RU2007135793/06A patent/RU2407898C2/ru not_active IP Right Cessation
  • 2006-02-23 WO PCT/EP2006/001670 patent/WO2006092238A1/de not_active Ceased
  • 2006-02-23 JP JP2007557384A patent/JP2008531264A/ja active Pending
  • 2006-02-23 PL PL06707217T patent/PL1853800T3/pl unknown
• 2007
  • 2007-08-28 US US11/845,799 patent/US7527666B2/en not_active Expired - Fee Related

Patent Citations (4)

Non-Patent Citations (3)

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