EP1527262B1 - Abgasfilter und verfahren zum reinigen eines abgases - Google Patents

Abgasfilter und verfahren zum reinigen eines abgases Download PDF

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Publication number
EP1527262B1
EP1527262B1 EP03784018A EP03784018A EP1527262B1 EP 1527262 B1 EP1527262 B1 EP 1527262B1 EP 03784018 A EP03784018 A EP 03784018A EP 03784018 A EP03784018 A EP 03784018A EP 1527262 B1 EP1527262 B1 EP 1527262B1
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EP
European Patent Office
Prior art keywords
exhaust gas
filter
region
gas filter
flow
Prior art date
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Expired - Fee Related
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EP03784018A
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German (de)
English (en)
French (fr)
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EP1527262A1 (de
Inventor
Rolf BRÜCK
Jan Hodgson
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Vitesco Technologies Lohmar Verwaltungs GmbH
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Emitec Gesellschaft fuer Emissionstechnologie mbH
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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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • 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
    • F01N3/0218—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 the filtering elements being made from spirally-wound filtering material
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • 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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/0231—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 using means for regenerating the filters, e.g. by burning trapped particles using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2330/10—Fibrous material, e.g. mineral or metallic wool
    • 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
    • F01N2330/14—Sintered material
    • 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
    • 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
    • F01N2330/38—Honeycomb supports characterised by their structural details flow channels with means to enhance flow mixing,(e.g. protrusions or projections)
    • 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
    • F01N2330/44—Honeycomb supports characterised by their structural details made of stacks of sheets, plates or foils that are folded in S-form
    • 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
    • F01N2350/00—Arrangements for fitting catalyst support or particle filter element in the housing
    • F01N2350/02—Fitting ceramic monoliths in a metallic housing
    • F01N2350/06—Fitting ceramic monoliths in a metallic housing with means preventing gas flow by-pass or leakage
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/24—Methods or apparatus for fitting, inserting or repairing different elements by bolts, screws, rivets or the like
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/065—Surface coverings for exhaust purification, e.g. catalytic reaction for reducing soot ignition temperature
    • 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
    • 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
    • F01N3/0226—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 fibrous
    • 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
    • F01N3/033—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 in combination with other devices
    • F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters

Definitions

  • the invention relates to an exhaust gas filter for cleaning an exhaust gas of an internal combustion engine from at least one strip-shaped filter layer, and a method for cleaning an exhaust gas of an internal combustion engine.
  • particulate traps are known for reducing particulate emissions in the exhaust gas, in particular of diesel engines, which are constructed from a ceramic substrate. These have channels, so that the exhaust gas to be purified can flow into the particulate trap. The adjacent channels are alternating closed so that the exhaust gas enters the inlet side into the channel, passes through the ceramic wall and escapes through the adjacent channel on the outlet side again.
  • Such particle traps are known as closed particle filters. They achieve an effectiveness of about 95% over the entire width of the occurring particle sizes.
  • a problem is the safe regeneration of the filter in the exhaust system of an automobile.
  • the regeneration of the particulate trap is required because the increasing accumulation of particulate matter in the channel wall to be flowed results in a steadily increasing pressure loss, which has a negative impact on engine performance.
  • the regeneration essentially comprises the brief heating of the particle trap or of the particles accumulated therein, so that the soot particles are converted into gaseous constituents.
  • this high thermal load of the particle trap has a negative impact on the lifetime.
  • a continuous regeneration trap system (CR1) has been developed.
  • the particles are reacted at temperatures already above 200 ° C by means of oxidation with NO 2 .
  • This temperature limit is significantly lower than with classical particle traps.
  • the required NO 2 is often generated by an oxidation catalyst, which is arranged upstream of the particulate trap.
  • NO nitrogen monoxide
  • a filter with real continuous regeneration must function essentially as a compensator or memory to ensure that the two reactants at a given time, in the u. a is the minimum reaction temperature is present in the required amounts in the filter.
  • the filter is to be arranged as close as possible to the internal combustion engine in order to be able to assume the highest possible temperatures immediately after the cold start.
  • the filter is preceded by an oxidation catalyst which converts carbon monoxide and hydrocarbons and in particular also converts nitrogen monoxide into nitrogen dioxide.
  • the required high thermal loadable filter material is from the unpublished German patent application DE 101 53 283 known.
  • a filter system is described, which can be essentially referred to as "open filter system".
  • the open system is dispensed with a constructive, mutual closing of the filter channels.
  • the channel walls consist at least partially of porous or highly porous material, the flow channels of the open filter have deflecting or guiding structures which direct the exhaust gas with the particles contained therein towards the areas of porous or highly porous material.
  • a particle filter is called open if it can be traversed completely by particles in principle, even of particles that are considerably larger than the actual particles to be filtered out. Thus, such a filter can not clog even during agglomeration of particles during operation.
  • a suitable method for measuring the openness of a particulate filter is, for example, testing up to which diameter spherical particles can still trickle through such a filter.
  • a filter is especially open when balls larger than or equal to 0.1 mm in diameter can still trickle through, preferably balls with a diameter above 0.2 mm.
  • the open particle filter described in this document has the problem that due to the absolutely necessary oxidation catalyst, which must be connected upstream in the flow direction of the particle trap, the cold start behavior of the particulate trap is relatively sluggish, d. H. through the first oxidation catalyst to be heated before the particle trap, the latter is heated only relatively slowly.
  • European Patent Application EP A1 0798452 discloses a particulate filter for use in a diesel engine, comprising a plurality of even flat filters and a plurality of even corrugated sheets, wherein the flat filters and corrugated sheets are alternately stacked and thus spirally rolled up.
  • the flat filters consist of a non-woven, heat-resistant, porous and catalytically coated fabric.
  • the channels thus formed are alternately closed by bending adjacent filters together and welding them together.
  • the particulate filter is problematic to manufacture and has a relatively high pressure loss.
  • an object of the invention to provide an exhaust gas filter for purifying an exhaust gas of an internal combustion engine, and a method for purifying an exhaust gas of an internal combustion engine, which / has a fast cold start behavior and meets the condition of continuous regeneration.
  • An inventive exhaust gas filter for cleaning an exhaust gas of an internal combustion engine is formed from at least one strip-shaped filter layer with at least one filter region made of at least partially fluid-flowable material and a metal foil.
  • the filter layer has at least one contact region with a catalytically active coating for reacting gaseous components of the exhaust gas and a filter region for filtering out particles from the exhaust gas.
  • the contact area of the filter layer allows an oxidative reaction of the gaseous constituents of the exhaust gas, wherein especially carbon monoxide and hydrocarbons and in particular also nitrogen monoxide are converted to nitrogen dioxide.
  • the contact area ensures that from reaching the operating temperature so much NO 2 is present in the exhaust gas flowing through the filter area, the exhaust gas filter can be operated in a continuous regeneration operation with respect to the filtered particles, so that the formation of an upstream oxidation catalyst to provide the necessary NO 2 can be dispensed with. Consequently, a close-coupled installation of the exhaust gas filter is possible. This requires a faster heating of the actual exhaust gas filter and thus a significantly improved cold start behavior in comparison to the known from the prior art open filter system with upstream oxidation catalyst.
  • the contact region can be formed in regions in which the filter layer is connected to any adjacent sheet metal layers or to a jacket tube enclosing the exhaust gas filter.
  • the formation of such a joining connection is often done by soldering, but welding or other joining techniques are possible.
  • the filter layer is constructed of a material which can be flowed through at least partially for a fluid, the formation of this connection with other sheet metal layers and / or the jacket tube normally results in that the filter layer can no longer be flowed through in this region or only to a very limited extent for a fluid because, for example, in the case of soldering, the material is soaked with solder, so that no more particles can be taken up here.
  • the contact region consists at least partially of a metal foil.
  • the formation of the contact region at least partially from a metal foil advantageously allows a simple coating of the contact region, since a metal foil can be coated in a known manner with catalytically active material, for example in the form of a so-called washcoat, into which the catalytically active substances, for example noble metals such as Platinum or rhodium can be introduced. According to the invention, it is also possible to use already coated films to form the contact area.
  • the exhaust gas filter has a main flow direction in which it is flowed through by the exhaust gas.
  • the contact region is formed in the main flow direction upstream of the filter region. This advantageously allows the formation of the contact region, especially in the gas inlet-side edge region of the regular to form a compound of the various. Filter layers and / or metal layers are used with each other and / or with the sheath body.
  • Embodiment of the exhaust gas filter according to the invention has the advantage that for the contributing to the effectiveness of the Partikeliteritervones, ie for the downstream filter area, a sufficiently large amount of nitrogen dioxide is available, so that the filter area operated very quickly even after a cold start in CRT mode can be.
  • Metal foil and filer region overlap in a connecting region
  • a joining connection between the metal foil that is to say the contact region and the filter region, is carried out.
  • This connection region can be produced, for example, by riveting, soldering or welding or by a combination of at least two of these methods, wherein the connection region in the axial direction is smaller than the contact region, see also Fig. 1 ,
  • the metal foil is microstructured.
  • a microstructured metal foil causes the flow in the flow channel to become more turbulent and no edge-side layers of laminar flow form. As a result, a greater proportion of the gas flow is directed in the direction of the material regions through which fluid can flow, at least partially. Overall, this advantageously improves the effectiveness of the filter.
  • a microstructure of the metal foil can be used to equalize the thickness between the contact area and the filter area.
  • the microwelling of the metal foil allows a significantly increased reaction area for the reaction of the at least one gaseous Component of the exhaust gas.
  • the contact region may consist at least partially of the material through which a fluid can flow. This advantageously allows the simple production of the exhaust gas filter, since, for example, the entire filter layer consists only of the material which can be flowed through by a fluid and this is coated or impregnated only in the contact region with the catalytically active material.
  • the contact region is formed in the gas inlet-side end region of the exhaust gas filter, preferably in a length range of less than 20% of the axial length of the exhaust gas filter, more preferably in a length range of less than 10% of the axial length of the exhaust gas filter.
  • the exhaust gas filter is formed by intertwined layers, which are at least partially filter layers.
  • Other layers may be, for example, sheet metal layers which may be structured or substantially smooth.
  • the exhaust gas filter is formed from substantially smooth sheet metal layers and structured filter layers or from substantially smooth filter layers and structured sheet metal layers.
  • Such a construction makes it possible, for example, to construct the exhaust gas filter as a honeycomb body made of smooth and structured layers. The decision as to whether structured filter layers and smooth sheet metal layers or structured sheet metal layers and smooth filter layers are to be selected depends on the requirements of the exhaust gas filter.
  • the metal foil and the material which can be flowed through at least partially for a fluid are connected to one another in terms of filling technology.
  • the metal foil and the material which can be flowed through at least partially for a fluid are welded, soldered and / or riveted, preferably welded and / or soldered, particularly preferably soldered.
  • the metal foil is formed as a contact region upstream of the filter region in the gas inlet side region of the exhaust gas filter.
  • the metal foil also serves as a blow-out protection in this subarea of the exhaust gas filter which is heavily loaded by the exhaust pulses of the internal combustion engine and thermal cyclic stresses.
  • the effect of these exhaust pulses is further enhanced if there is a particularly close to the engine installation.
  • the material, which can be flowed through at least partially for a fluid is made of metal fibers is advantageous because such, for a fluid flow-through material is very heat resistant and thus the thermal cycling in the exhaust system of a motor vehicle can be exposed to a relatively long life. It is particularly advantageous if the material through which a fluid can flow is made of sintered metal fibers.
  • a method for cleaning an exhaust gas of an internal combustion engine is proposed, which is carried out in particular in an exhaust gas filter according to the invention.
  • both a conversion of the gaseous constituents of the exhaust gas and a filtering out of particles from the exhaust gas take place in a honeycomb body.
  • the reaction of the gaseous constituents of the exhaust gas with respect to a main flow direction of the exhaust gas filter takes place upstream of the filtering of particles.
  • This advantageously allows the provision of nitrogen dioxide, which is needed for the GRT operation of the filter region of the exhaust gas filter.
  • the reaction of the gaseous particles is catalyzed by at least one catalyst, preferably a noble metal catalyst. This advantageously allows the lowering of the operating temperatures of the exhaust gas filter.
  • Fig. 1 shows a first embodiment of a Fiterlage 1, which serves to construct an exhaust gas filter according to the invention.
  • the filter layer 1 has a filter region 2 and a contact region 3.
  • the filter region 2 is formed from at least partially permeable material for a fluid.
  • the filter area 2 thus consists of a porous or highly porous material. Preferred here is the formation of metal fibers, more preferably sintered metal fibers.
  • the filter area 2 has a high thermal stability.
  • the contact region 3 is formed as a metal foil 4.
  • the contact region 3 is coated with a catalytically active material. Particularly preferred here is the coating in the form of a washcoat, are introduced into the noble metal catalysts.
  • the reaction of the gaseous component, which is caused by the Catalytically active coating are catalysed, it is in any case to the conversion of NO to NO 2 , further it is possible according to the invention, also hydrocarbons that unburned reach the exhaust gas filter, and convert carbon monoxide.
  • the filter region 2 can be flowed through at least partially for a fluid.
  • the particles located in the exhaust gas are filtered off. These are increasingly occurring in the exhaust gas of diesel engines.
  • the particles are affected by interception and / or impaction of the particles and / or in the porous filter region 2 adhesion of at least part of the particles located in the exhaust gas.
  • the pressure differences in the flow profile of the flowing exhaust gas are important.
  • Metal foil 4 and filter region 2 overlap in a connecting region 5.
  • This connection region 5 can be produced for example by riveting, soldering or welding or by a combination of at least two of these methods.
  • soldering various soldering methods are possible, in which the solder is applied as a powder or solder foil.
  • the metal foil 4 it is possible according to the invention for the metal foil 4 to have microstructures, preferably milk curvatures. These can on the one hand serve to prevent layer flows in the edge region, but on the other hand it is also possible to compensate for a height difference between the filter region 2 and the contact region 3 in an advantageous manner so to simplify the construction of the exhaust filter.
  • This area may consist of a particularly thin film, for example with a thickness of 15 to 30 microns, and / or holes to keep the heat capacity low, which improves the cold start behavior.
  • connection region 5 It is also advantageously possible to compress the connection region 5. This can be done by pressing, rolling or as part of a welding process, such. B. the Rollnahtsch biotech done.
  • Fig. 2 shows an embodiment of a filter layer 1 not belonging to the invention for constructing an exhaust gas filter.
  • This filter layer 1 also has a filter region 2 and a contact region 3.
  • the contact area 3 is different from in Fig. 1
  • the Ausfubrungsbeispiel shown also formed of porous material which has been coated or impregnated with a catalytically active material.
  • the impregnation of the contact area 3 with a washcoat containing the noble metal catalysts is particularly advantageous in this connection.
  • the contact region 2 can also be pretreated by compression, for example by pressing or rolling, in order to reduce the amount of washcoat taken up.
  • the filter layer 1 can also be structured, preferably corrugated. It is erfindungsgeläßäß possible to combine smooth filter layers 1 with corrugated, not shown, layers to an exhaust filter. This can be done for example by the construction of a known per se honeycomb body, for example in spiral, S, SM or any other form. Equally good, however, is the construction of an exhaust gas filter, For example, in the form of a honeycomb body, also possible by a structured filter layer 1 is combined with smooth other layers.
  • Fig. 3 1 shows an exemplary embodiment of a structured, namely corrugated, filter layer 1.
  • This filter layer 1 has a first contact region 6, a second contact region 7, a first filter region 8 and a second filter region 9.
  • the implementation of at least a portion of the gaseous constituents of the exhaust gas takes place.
  • the reaction of NO to NO 2 preferably takes place in these areas. With the resulting NO 2, it is possible to operate the exhaust filter according to the invention in the CRT mode.
  • Fig. 4 This is traversed by an exhaust gas flow 12 in the axial direction, the exhaust gas flow 12 flows through the gas inlet side 13 into the exhaust gas filter 11 and leaves it through the gas outlet side 14.
  • the exhaust gas filter 11 is constructed as a honeycomb body. As shown in the small detailed area, the exhaust filter 11 is made up of smooth layers 15 and structured layers 16 which alternate and are S-shaped. It would equally well be possible to combine smooth layers 15 and structured layers 16 in a different way , for example, these spiral or SM-shaped, or to wrap in any other forms.
  • the smooth layers 15 and the structured layers 16 form channels 19 which can be flowed through for a fluid, for example for the exhaust gas stream 12.
  • filter layers 1 and 16 are inventively possible to use as a smooth layers of filter layers 1 and 16 as structured layers of sheet metal layers, just as well it is also possible to use as a structured layers 16 filter layers 1 and as smooth layers 15 sheet layers.
  • the at least partial use of filter layers 1 both as smooth layers 15 and as structured layers 16 is possible according to the invention.
  • the exhaust gas filter 11 has a contact region 3 in which the conversion of at least one part of at least one gaseous component of the exhaust gas flow 12 takes place.
  • the contact region 3 the reaction of nitrogen oxide to nitrogen dioxide, ie from NO to NO 2 , so that generated by the reactions in the contact region of the necessary for the CRT operation proportion of NO 2 .
  • the length extension 18 of the contact region 3 is chosen to be significantly smaller.
  • the length extension 18 of the contact region 3 is less than 20%, particularly preferably less than 10% of the axial length 17 of the exhaust gas filter 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Catalysts (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filtering Materials (AREA)
EP03784018A 2002-08-02 2003-07-16 Abgasfilter und verfahren zum reinigen eines abgases Expired - Fee Related EP1527262B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10235766A DE10235766A1 (de) 2002-08-02 2002-08-02 Abgasfilter und Verfahren zum Reinigen eines Abgases
DE10235766 2002-08-02
PCT/EP2003/007723 WO2004015251A1 (de) 2002-08-02 2003-07-16 Abgasfilter und verfahren zum reinigen eines abgases

Publications (2)

Publication Number Publication Date
EP1527262A1 EP1527262A1 (de) 2005-05-04
EP1527262B1 true EP1527262B1 (de) 2010-09-08

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EP03784018A Expired - Fee Related EP1527262B1 (de) 2002-08-02 2003-07-16 Abgasfilter und verfahren zum reinigen eines abgases

Country Status (10)

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US (1) US7347042B2 (ja)
EP (1) EP1527262B1 (ja)
JP (1) JP4659455B2 (ja)
KR (1) KR101009197B1 (ja)
CN (1) CN1678820B (ja)
AU (1) AU2003258516A1 (ja)
DE (2) DE10235766A1 (ja)
ES (1) ES2352194T3 (ja)
RU (1) RU2316656C2 (ja)
WO (1) WO2004015251A1 (ja)

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KR100810748B1 (ko) * 2007-03-20 2008-03-10 화이버텍 (주) 저밀도부를 갖는 배가스 정화장치용 필터
KR100705707B1 (ko) * 2006-03-23 2007-04-09 화이버텍 (주) 금속섬유 메디아, 이를 필터 부재로한 배가스 정화장치용필터 및 필터 제조방법
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RU2490481C1 (ru) * 2012-02-28 2013-08-20 Закрытое акционерное общество "Саровские Лаборатории" Способ удаления токсичных веществ из выхлопных газов автомобиля и устройство для реализации способа
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Also Published As

Publication number Publication date
CN1678820A (zh) 2005-10-05
US20050217258A1 (en) 2005-10-06
RU2005105942A (ru) 2006-06-10
RU2316656C2 (ru) 2008-02-10
EP1527262A1 (de) 2005-05-04
KR101009197B1 (ko) 2011-01-19
CN1678820B (zh) 2012-02-29
JP4659455B2 (ja) 2011-03-30
JP2005534487A (ja) 2005-11-17
AU2003258516A1 (en) 2004-02-25
KR20050030222A (ko) 2005-03-29
DE50313071D1 (de) 2010-10-21
WO2004015251A1 (de) 2004-02-19
ES2352194T3 (es) 2011-02-16
US7347042B2 (en) 2008-03-25
DE10235766A1 (de) 2004-02-19

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