EP2352572A1 - Vlies zur abgasbehandlung und abgasreinigungsvorrichtung - Google Patents
Vlies zur abgasbehandlung und abgasreinigungsvorrichtungInfo
- Publication number
- EP2352572A1 EP2352572A1 EP09744125A EP09744125A EP2352572A1 EP 2352572 A1 EP2352572 A1 EP 2352572A1 EP 09744125 A EP09744125 A EP 09744125A EP 09744125 A EP09744125 A EP 09744125A EP 2352572 A1 EP2352572 A1 EP 2352572A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filaments
- exhaust gas
- filament
- different
- metallic filaments
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- 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
- B01D39/2027—Metallic material
- B01D39/2041—Metallic material the material being filamentary or fibrous
- B01D39/2044—Metallic material the material being filamentary or fibrous sintered or bonded by inorganic agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/0604—Arrangement of the fibres in the filtering material
- B01D2239/064—The fibres being mixed
Definitions
- the present invention relates to a nonwoven fabric for exhaust treatment comprising a plurality of metallic filaments.
- an exhaust gas purification device with a channel structure is also specified.
- the invention finds particular application in the purification of exhaust gases of mobile internal combustion engines.
- Such exhaust gas purification devices may have different functions in exhaust systems of internal combustion engines. Thus, they are used for example as a catalyst carrier body, as a so-called adsorber, as a filter, as a flow mixer and / or as a muffler.
- the channel structure is usually characterized by a favorable ratio of surface area to volume, thus forming a relatively large surface area and thus ensuring intensive contact with an exhaust gas flow past or through it.
- Such exhaust gas purification devices include, for example, honeycomb bodies, which may be composed of a plurality of different components (sheets, mats, pipes, etc.), in some cases also with different materials (steel materials, ceramic substances, mixed materials, etc.). In view of the high thermal and dynamic loads in exhaust systems of mobile internal combustion engines, these individual components must be permanently connected. For this purpose, different connection techniques are known, such as brazing and / or welding.
- a non-woven is to be specified, which is particularly suitable for the restraint or implementation of particularly small solids contained in the exhaust gas.
- the fleece should also be inexpensive to produce and can be easily integrated into an exhaust gas purification device.
- the nonwoven fabric for exhaust gas treatment comprises a multiplicity of metallic filaments, wherein the nonwoven has at least two types of different contours of the metallic filaments.
- “fleece” is meant in particular a two-dimensional, continuous arrangement of the metallic filaments, wherein the metallic filaments are basically positioned in a regular but preferably in a chaotic arrangement with respect to one another , Wires, shavings and the like understood.
- the filaments are preferably made of a material which is resistant to high temperatures and corrosion.
- a steel is considered as the base material, with preferably high proportions of chromium (eg in a range from 18 to 21% by weight) and / or aluminum (for example at least 4.5% by weight) being used.
- the filaments can be unambiguously assigned to the species,
- one type of filaments may have a cross section and / or diameter varying over the length, while another type of filaments may have a substantially constant cross section
- the different types of filaments may be spatially distributed in the web, but it is also possible that concrete zones are formed with separated areas of the filaments of only one type of contours.
- the at least two types of metallic filaments have been produced by different production methods.
- the manufacturing process has a considerable influence on the formed contour of the filaments, which also results in particular from the manufacturing process conclusions on the respective contour.
- the manufacturing process and the ultimately provided contour of the metallic filament are closely related.
- the choice of different contours of the filaments for a fleece for the exhaust gas treatment has, for example, effects on the further processing steps.
- a nonwoven is additionally coated.
- a washcoat is applied which further enlarges the catalytically active surface of the nonwoven material.
- whiskers by oxide formation from the nonwoven material itself is possible. With suitable oxidation, three-dimensional oxide structures grow out of the individual filaments, which lead to a considerable enlargement of the surface and thus also to an improvement in the catalytic properties of the nonwoven.
- the deposition of coatings and / or the formation of oxide structures and whiskers on the material can be greatly influenced by the mixture of differently produced filaments of different contour.
- Differently made filaments have e.g. different microstructure and surface structures.
- subregions of the filaments are optionally electrochemically or galvanically activated and / or passivated.
- a suitable mixture of differently produced filament types in a nonwoven these properties can be adjusted so that a particularly advantageous behavior in the coating and / or in a further processing of the nonwoven is present and thus better properties of the web for the exhaust treatment arise.
- a desired formation or concentration of sintered compounds and / or a desired formation or concentration of an oxide layer with a (uniform, common) Heat treatment can be achieved.
- the different production methods are selected from the following group: a) separation from a metal block; b) continuous filament production from a molten metal;
- the "cutting off of a metal block” also includes milling, drilling, turning, planing, rasping, cutting or similar, in particular chip-producing, production methods.
- the chip represents the filament.
- milling, planing and rasping a regular (short If a broken chip is produced, very long chips can be produced during turning or boring.
- a block of metal is meant above all a solid body which is made of metal, whereby the explicit form of the body is taken into account in view of that used for chip or fi lament production Accordingly, the metal block can be present as a cylinder, cuboid, wire or in similar form.
- a wire-like, very long or so-called “endless” fiber is produced from the molten metal, whereby the filaments can be extruded or pulled together in bundles individually or in a bundle
- a continuous filament is withdrawn from a rotating cylindrical metal block where the metal block is locally melted by means of a laser and a filament is formed from this melt uniform high quality wires are produced.
- the discontinuous removal of the filaments from a molten metal is, as it were, a mixing method between the two aforementioned methods.
- an impeller with a structured peripheral surface is moved relative to the molten metal, whereby parts of the molten metal are removed from the bath by the temporary contact, which later Cool to the metallic filaments.
- discontinuous filaments are repeatedly produced at high speed.
- wire drawing a filament is worked out by plastic deformation of a solid wire blank out.
- at least one wire blank with the help of drawing discs pulled through conically tapered dies. This reduces the diameter in each case. To achieve large diameter reductions, wire drawing can be done in multiple stages.
- the wire drawing can be drawn as a single wire, with only one wire is pulled by a die. Alternatively, each wire bundles can be pulled through the dies. One then speaks of bundle-drawn wires. As a result, the wire drawing is considerably cheaper.
- Filaments extracted from a melt usually have predominantly a bread-shaped or kidney-shaped contour.
- the contours of filaments separated from a metal block are usually characterized by flat sides and / or sharp-edged transitions between these sides.
- the contours of individually drawn wires are usually round and those of the bundle drawn wires have a round basic shape, which has indentations. These indentations arise during the drawing process by the application of adjacent wires.
- this description is (only) trend-setting, the manufacturing processes allow so far remarkable tolerances, so that the above-mentioned features are more or less pronounced - an evaluation of the total filaments of a nonwoven but will clearly show a corresponding diversity of various contours.
- the filaments produced by the different methods also differ in their length distribution.
- Filament extracted from the melt and filaments produced by wire drawing typically have very uniform length distributions with a low variance in the filament lengths. These filaments are usually first made in long lengths and then cut into lengths suitable for tile making. The lengths of filaments separated from a metal block usually have a higher variance. Typically, such filaments are made by machining. In this case, the procedure is such that a desired average filament length is formed, but due to the process also arise longer and shorter filaments. The filament lengths are regularly distributed normally around a mean filament length. Thus, it is clear that, if necessary, secondary evidence of the use of such different filaments can be used.
- the at least two types are arranged at least partially mixed with one another.
- the nonwoven has, in particular in its main extension plane, several layers or zones, wherein the various types are mixed with one another and / or arranged separately from one another.
- the different filaments are (partially) mixed with each other, so that a fleece having substantially the same properties is provided across the thickness and the main extension plane.
- exactly two types of different contours are realized in the nonwoven, wherein a type of metallic filaments wire-shaped and a kind of metallic filaments is formed span-shaped.
- filamentary filaments in particular allows the formation of a flexible basic structure, which gives the nonwoven the required support.
- the chip-shaped filaments which are characterized in particular by a relatively thin or thin final deformation, can form needle-like structures, so that overall the surface roughness or the pore size is influenced so that here for coatings and / or the deposition of solids particularly suitable areas generate a stable bond to the fleece.
- Such particularly suitable regions can also be produced, for example, by an uneven distribution of the different types of filaments.
- an exhaust gas purification device which has an exhaust gas for at least partially through-flow channel structure, wherein the channel structure is at least partially executed with a non-woven of the present invention described here.
- the channel structure is in particular a kind of honeycomb structure, which is constructed with layered and / or tortuous layers.
- the layers can be constructed with fleece and / or metal foils.
- the channels through which the exhaust gas can flow can be open and / or mutually closed.
- deflections, flow restrictions and the like may be formed in the channels in order to guide or deflect the exhaust gas entering the channel structure toward the fleece or through the fleece.
- FIGS. The invention and the technical environment will be explained in more detail with reference to FIGS. It should be noted that the figures are particularly show preferred embodiments of the invention, but this is not limited thereto. They show schematically:
- Fig. 5 the structure of a mobile emission control system
- Fig. 6-9 different contours of filaments.
- FIG. 1 shows schematically a first type of metallic filament 2 with a substantially wire-like contour 3.
- This wire-like contour 3 can be described by forming a substantially uniform filament cross section 14 perpendicular to the longitudinal direction 17 in the longitudinal direction 17. It is clear that such a filamentary filament 2 need not be incorporated in the nonwoven fabric in the stretched embodiment illustrated here, but may optionally also be bent.
- Fig. 2 shows another type of filament 2, which is formed substantially span-shaped, so over the longitudinal direction 17 does not have a constant filament cross-section 14. Rather, the filament cross section 14 varies over the longitudinal direction 17 of the filament 2 in shape and / or size. It is preferred that the filament 2 is formed by end portions in the longitudinal direction 17, which are made different thickness.
- the metallic filaments having a filament length in the range of 0.1 to 50 mm (in particular in the range of 1 to 10 mm) and a filament diameter in the range of 0.01 to 0.1 mm (in particular a range of 0.02 to 0.05 mm).
- a first type of filaments 2 of a first contour is arranged centrally, while the upper and lower outer surfaces 15 are configured with filaments 2 of a second contour.
- wire-shaped filaments 2 are used in central regions, while filaments 2 in chip form are provided close to the respective outer surface 15.
- a transition region is provided in each case in that the filaments 2 of the different regions are connected to one another by joining technology, for example by welding and / or sintering.
- the channel structure 5 is formed here with metal foils 6 and a web 1.
- the metal foils 6 have a wavy structure 8, so that with the metal foils 6 and the web 1, a plurality of channels 7 are formed, through which the exhaust gas can flow.
- the channels 7 projecting bottlenecks 9, z. B. by forming suitable projections or vanes, which cause a deflection of the exhaust gas flow to the web 1.
- the particles contained in the exhaust gas flowing in the flow direction 13 exhaust gas are fed into or to the web 1.
- the particles depositing there can be reacted continuously (CRT process) or discontinuously, wherein the nonwoven 1 and / or the metal foil 6 can be designed with a corresponding coating 16.
- FIG. 5 illustrates one possible embodiment of systems for treating mobile combustion residues. Shown is an internal combustion engine 10, in which the exhaust gas is produced, the exhaust gas then through a corresponding exhaust system 11 is passed. Part of this exhaust system 11 is an exhaust gas purification device 4 with a channel structure 5, through which the exhaust gas is passed. In this exhaust gas purification device 4, a purification of the exhaust gas, in particular a conversion of pollutants in the exhaust gas, so that it can be discharged purified to the environment.
- the internal combustion engine and the exhaust system are regularly part of a motor vehicle 12.
- Fig. 5 illustrates only a schematic, exemplary embodiment, regularly a larger number of exhaust gas cleaning devices 4 are used.
- the design of an exhaust gas purification device 4 in the manner of an open particle separator is proposed schematically.
- FIGS. 6, 7, 8 and 9 show diagrammatically and categorically different contours 3 of the filament cross sections 12 of different filaments 2.
- the respective contour shapes in the figures can typically be assigned to specific production methods.
- Fig. 6 shows the filament cross-section 14 of a filament 3, which is formed in the manner of a single drawn wire. This is typically characterized by a round shape, as dies for wires are regularly round. Individually drawn wires are rarely used because the manufacturing process is very costly and expensive.
- Fig. 7 shows a filament 3 pulled in the bundle.
- a plurality of wires in parallel as a bundle through a
- Filament cross-section 14 of a round filament shape
- Fig. 8 shows a filament cross-section 14 of a filament 2, which consists of a
- Melt was extracted.
- the shape is similar to bread or kidney.
- a rotating disk or rotating impeller is immersed in a melt and ejects a "jet.” This jet is solidified due to the shape of the immersed disk and the forces acting during the solidification process bread or kidney-like shape.
- FIG. 9 shows a characteristic filament cross-section 14 of a filament 2 which has been produced by separation from a metal block. Separation from the billet may be done by "scraping" methods, such as turning, milling, planing, rasping, cutting and / or boring processes.
- the contour 3 of such filaments 2 is regularly characterized by flat sides which The shape of the machining tool corresponds to the shape between these sides, which typically have sharp-edged transitions.
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008056054A DE102008056054A1 (de) | 2008-11-05 | 2008-11-05 | Vlies zur Abgasbehandlung und Abgasreinigungsvorrichtung |
PCT/EP2009/064025 WO2010052141A1 (de) | 2008-11-05 | 2009-10-24 | Vlies zur abgasbehandlung und abgasreinigungsvorrichtung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2352572A1 true EP2352572A1 (de) | 2011-08-10 |
Family
ID=41665284
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09744125A Ceased EP2352572A1 (de) | 2008-11-05 | 2009-10-24 | Vlies zur abgasbehandlung und abgasreinigungsvorrichtung |
Country Status (5)
Country | Link |
---|---|
US (1) | US8444740B2 (de) |
EP (1) | EP2352572A1 (de) |
JP (1) | JP5616350B2 (de) |
DE (1) | DE102008056054A1 (de) |
WO (1) | WO2010052141A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117379879B (zh) * | 2023-09-04 | 2024-05-14 | 鸿翔环境科技股份有限公司 | 一种环保再生骨料生产用废气净化装置 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB464727A (en) * | 1936-01-11 | 1937-04-23 | Hevaloid Ag | Improvements in or relating to porous metallic products |
US3329047A (en) * | 1965-08-19 | 1967-07-04 | Edward J Mctamany | Chipbreaking method |
US4020891A (en) * | 1974-11-11 | 1977-05-03 | Brunswick Corporation | Melt spinning process and machine |
JPH084720B2 (ja) * | 1986-06-30 | 1996-01-24 | 株式会社キッツ | 平板状多孔性薄膜積層型フイルタ−及びその製造方法 |
US5204067A (en) * | 1991-07-11 | 1993-04-20 | Schwaebische Huettenwerke Gmbh | Filter |
DE4201559A1 (de) * | 1992-01-22 | 1993-07-29 | Schwaebische Huettenwerke Gmbh | Material fuer filter, insbesondere oel-, benzin- oder dieselfilter von kraftfahrzeugen |
US6169045B1 (en) * | 1993-11-16 | 2001-01-02 | Kimberly-Clark Worldwide, Inc. | Nonwoven filter media |
EP0891218B1 (de) * | 1996-02-02 | 2005-04-13 | Pall Corporation | Motoranordnung mit russfilter |
US5972814A (en) * | 1997-06-25 | 1999-10-26 | Global Material Technologies, Inc. | Reinforced nonwoven metal fabric |
DE10257113A1 (de) * | 2002-12-05 | 2004-06-24 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Partikelfalle mit beschichteter Faserlage |
US20040159549A1 (en) * | 2003-02-14 | 2004-08-19 | Park Yong Bum | Apparatus and method for fabricating metal fibers using electroforming |
DE102005028031A1 (de) * | 2005-06-17 | 2006-12-21 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Wabenkörper-Herstellung mit einem metallischen Vlies |
DE102005032348A1 (de) * | 2005-07-08 | 2007-01-11 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Filterlage für einen, insbesondere konischen, Wabenkörper zur Abgasbehandlung und Verfahren zur Herstellung der Filterlage |
-
2008
- 2008-11-05 DE DE102008056054A patent/DE102008056054A1/de not_active Withdrawn
-
2009
- 2009-10-24 WO PCT/EP2009/064025 patent/WO2010052141A1/de active Application Filing
- 2009-10-24 EP EP09744125A patent/EP2352572A1/de not_active Ceased
- 2009-10-24 JP JP2011533692A patent/JP5616350B2/ja not_active Expired - Fee Related
-
2011
- 2011-05-05 US US13/101,512 patent/US8444740B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO2010052141A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2010052141A1 (de) | 2010-05-14 |
US20110209451A1 (en) | 2011-09-01 |
JP2012507653A (ja) | 2012-03-29 |
DE102008056054A1 (de) | 2010-05-06 |
JP5616350B2 (ja) | 2014-10-29 |
US8444740B2 (en) | 2013-05-21 |
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