EP0929739A1 - Honeycomb body with reduced heat conductivity in inflow and outflow areas - Google Patents

Honeycomb body with reduced heat conductivity in inflow and outflow areas

Info

Publication number
EP0929739A1
EP0929739A1 EP97944887A EP97944887A EP0929739A1 EP 0929739 A1 EP0929739 A1 EP 0929739A1 EP 97944887 A EP97944887 A EP 97944887A EP 97944887 A EP97944887 A EP 97944887A EP 0929739 A1 EP0929739 A1 EP 0929739A1
Authority
EP
European Patent Office
Prior art keywords
section
honeycomb body
thermal conductivity
channels
recesses
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.)
Granted
Application number
EP97944887A
Other languages
German (de)
French (fr)
Other versions
EP0929739B1 (en
Inventor
Rolf BRÜCK
Robert Diewald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vitesco Technologies Lohmar Verwaltungs GmbH
Original Assignee
Emitec Gesellschaft fuer Emissionstechnologie mbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Emitec Gesellschaft fuer Emissionstechnologie mbH filed Critical Emitec Gesellschaft fuer Emissionstechnologie mbH
Publication of EP0929739A1 publication Critical patent/EP0929739A1/en
Application granted granted Critical
Publication of EP0929739B1 publication Critical patent/EP0929739B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • F01N3/08—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
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and 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
    • F01N3/08—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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
    • F28F13/14—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by endowing the walls of conduits with zones of different degrees of conduction of heat
    • 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
    • F01N13/14—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 thermal insulation
    • 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
    • F01N2330/06—Ceramic, e.g. monoliths

Definitions

  • the subject matter of the invention relates to a structure through which a fluid can flow and which has an inlet region and an outlet region.
  • the entry area and the exit area are connected to one another by channels through which a fluid can flow.
  • WO 90/03220 discloses structures through which a fluid can flow and which can have a wide variety of cross sections. To reduce the pollutant components in the exhaust gas stream of an exhaust system, it is necessary that the structure is at a temperature which is sufficiently high for the catalytic conversion of the pollutants. In order to achieve the fastest possible light-off behavior of the catalyst, WO 89/10471 has already suggested that the structure be electrically heated. The electrical heating of such a structure reduces the emission of the pollutants of the exhaust gas which arise in the cold start phase of an internal combustion engine.
  • WO 90/04087 discloses a honeycomb body with thermal insulation, which is designed in the form of a double jacket system.
  • the double jacket system comprises an inner jacket tube which is arranged at a distance from an outer jacket tube in the latter.
  • the space created between the inner and outer casing tubes acts as thermal insulation. As a result, a reduction in the heat dissipation by the surface area of the structure is reduced.
  • the present invention has for its object to develop the structure through which a fluid flows so that the heat losses of the structure are further reduced.
  • this object is achieved by a structure through which a fluid can flow, with the features of claim 1.
  • Advantageous further developments and refinements of the structure are the subject of the subclaims.
  • the structure according to the invention is characterized in that it has a section of reduced thermal conductivity at least in the vicinity of the entry and exit areas.
  • a structure which serves as a honeycomb body for an exhaust gas catalytic converter the end-face heat losses due to heat conduction to the components of an exhaust system connected to the structure, as well as by convection of the exhaust gas located in the exhaust system, make a considerable contribution the total heat loss.
  • the structure according to the invention is proposed in order to avoid this, in particular end-face heat loss.
  • the section which has a reduced thermal conductivity extends at least partially into the structure.
  • the structure has a section of reduced thermal conductivity in the vicinity of the entry and exit areas, the heat losses of the middle section are reduced, as a result of which the section of the structure lying between the entry and exit areas is on a longer period of time is higher temperature than is the case with the known structures. In this way, an improved cleaning effect of an exhaust gas after a restart is achieved, since the structure between the entry and the exit area is at a higher temperature level.
  • the section between the inlet and the outlet area consequently heats up much faster, as a result of which the temperature required for the catalytic conversion is also reached more quickly.
  • An embodiment of the structure is preferred in which the section of reduced thermal conductivity extends over the entire cross section of the structure.
  • a reduction in the thermal conductivity of the structure can be achieved in that the wall is at least partially designed with a reduced wall thickness at least one of its channels. As a result, the cross section in the heat transport direction is reduced.
  • the section of reduced thermal conductivity be formed by the wall of at least one of the channels having at least one recess.
  • the cross section of the structure made available for heat transport is used. wrestles.
  • the formation of the recesses in the wall of the channels can impair the strength of the structure. Such an impairment of the strength of the structure does not occur if the section, without recesses, is made of a heat-insulating material.
  • the formation of recesses in a structure can take place before, during or after the manufacturing process of the structure. If the structure is formed by wound and / or layered layers of at least partially structured sheets, the recesses must be formed before the layers of the sheets are wound or layered.
  • a structure through which a fluid can flow and which in the vicinity of the inlet and outlet areas each have a section of reduced thermal conductivity is particularly suitable as a honeycomb body for an exhaust gas catalytic converter.
  • a honeycomb body is preferably arranged in a jacket tube, the jacket tube having a section of reduced thermal conductivity in the vicinity of the inlet and outlet regions.
  • the section be formed by recesses in the casing tube.
  • the recesses in the casing tube or in the structure, in particular in the honeycomb body, can be perforations.
  • the section of the reduced thermal conductivity is preferably arranged in alignment.
  • Figure 1 shows schematically a first embodiment of a honeycomb body
  • Figure 2 schematically shows a second embodiment of a honeycomb body in an exhaust system.
  • FIG. 1 shows a honeycomb body 1 through which a fluid can flow.
  • the honeycomb body 1 has an entry area 2 and an exit area 3.
  • the entry area 2 and the exit area 3 are connected to one another by channels 4 through which a fluid can flow.
  • the structure 1 is arranged in a jacket tube 5.
  • a section 6 with reduced thermal conductivity is formed in the structure 1 near the entry region 2.
  • Section 6 is formed by recesses 7.
  • the recesses 7 are formed in the wall 8 of the channels 4 and extend at least partially transversely to the direction of flow of the fluid F.
  • recesses 10 are formed, which form a section 10 of reduced thermal conductivity.
  • the recesses 9 are made in the wall 8 of the channels 4.
  • the jacket 5 also has a section 11 and a section 12 of reduced thermal conductivity in the entry or exit area 2, 3 of the structure 1.
  • the sections 11, 12 are formed by recesses 13 and 14, respectively.
  • the recesses 7, 9, 13 and 14 of the sections 6, 10, 11 and 12 are configured in the form of an elongated hole. They are of identical design both in the casing tube 5 and in the structure 1. - o -
  • FIG. 2 shows the arrangement of a structure 1 in an exhaust system of an internal combustion engine.
  • the structure 1 has a tubular casing 5 which has recesses 13 in the vicinity of the inlet region 2 and recesses 14 in the vicinity of the outlet region 3.
  • the jacket 5 of the structure 1 is surrounded by an insulating material 15.
  • This insulating material 15 is surrounded by an outer jacket tube 16.
  • a diffuser 17 is formed in front of the entry area 2 and is connected to the outer casing tube 16.
  • a confuser 18 is formed, which is connected to the outer jacket tube 16.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Silencers (AREA)

Abstract

The invention concerns a structure (1), that can be cross flown by a fluid, specially a honeycomb body for an exhaust gas catalyst. Said structure has an inflow area (2) and an outflow area (3) having channels to be cross flown by a fluid. The disclosed structure has near the inflow and the outflow areas (2, 3) respectively a section (6, 10) with reduced heat conductivity, which has recesses (7, 9) formed in the wall of at least some channels (4).

Description

Wabenkörper mit verringerter Wärmeleitfähigkeit im Eintritts- und Austrittsbereich Honeycomb body with reduced thermal conductivity in the entry and exit area
Der Gegenstand der Erfindung bezieht sich auf eine von einem Fluid durchströmbare Struktur, die einen Eintrittsbereich und einen Austrittsbereich aufweist. Der Eintrittsbereich und der Austrittsbereich sind durch für ein Fluid durchströmbare Kanäle miteinander verbunden.The subject matter of the invention relates to a structure through which a fluid can flow and which has an inlet region and an outlet region. The entry area and the exit area are connected to one another by channels through which a fluid can flow.
Solche Strukturen werden insbesondere als sogenannte Wabenkörper für einen Abgaskatalysator verwendet. Durch die WO 90/03220 sind von einen Fluid durchströmbare Strukturen bekannt, die unterschiedlichster Querschnitts formen sein können. Zur Reduktion der Schadstoffkomponenten im Abgasstrom eines Abgassystems ist es notwendig, daß die Struktur sich auf einer zur katalyti- sehen Umsetzung der Schadstoffe genügend hohen Temperatur befindet. Um ein möglichst rasches Anspringverhalten des Katalysators zu erreichen, ist bereits durch die WO 89/10471 vorgeschlagen worden, die Struktur elektrisch zu beheizen. Durch die elektrische Beheizung einer solchen Struktur wird der Ausstoß der in der Kaltstartphase einer Verbrennungskraftmaschine entstehenden Schadstoffe des Abgases verringert. Bei einem Kurzstreckenbetrieb eines Kraftfahrzeuges mit mehr oder weniger langen Pausen zwischen den einzelnen Fahrzyklen kühlt sich die Verbrennungskraftmaschine sowie das gesamte Abgassystem ab. Eine solche Abkühlung des Abgassystems, insbesondere des Wabenkörpers, f hrt dazu, daß der Wabenkörper Immer wieder elektrisch beheizt werden muß. Dies führt unter Umständen dazu, daß die Energiequelle, eine Batterie eines Kraftfahrzeuges, stark belastet wird. Bei einem Kurzstreckenbetrieb kann daher nicht sichergestellt werden, daß die Batterie immer wieder ausreichend aufgeladen wird. Um den zum Beheizen des Wabenkörpers notwendigen Energiebedarf zu verringern, ist daher bereits vorgeschlagen worden, den Wabenkörper mit einer thermischen Isolierung zu versehen. So ist beispielsweise durch die WO 90/04087 ein Wabenkörper mit einer thermischen Isolierung bekannt, die in Form eines Doppelmantelsystems ausgebildet ist. Das Doppelmantelsystem umfaßt ein inneres Mantelrohr, das im Abstand zu einem äußeren Mantelrohr in diesem angeordnet ist. Der zwischen dem inneren und dem äußeren Mantelrohr entstehende Zwischenraum wirkt als eine thermische Isolierung. Hierdurch wird eine Verringerung der Wärmeabgabe durch die Mantelfläche der Struktur verringert.Such structures are used in particular as so-called honeycomb bodies for an exhaust gas catalytic converter. WO 90/03220 discloses structures through which a fluid can flow and which can have a wide variety of cross sections. To reduce the pollutant components in the exhaust gas stream of an exhaust system, it is necessary that the structure is at a temperature which is sufficiently high for the catalytic conversion of the pollutants. In order to achieve the fastest possible light-off behavior of the catalyst, WO 89/10471 has already suggested that the structure be electrically heated. The electrical heating of such a structure reduces the emission of the pollutants of the exhaust gas which arise in the cold start phase of an internal combustion engine. In the case of a short-distance operation of a motor vehicle with more or less long breaks between the individual driving cycles, the internal combustion engine and the entire exhaust system cool down. Such cooling of the exhaust system, in particular of the honeycomb body, means that the honeycomb body must always be electrically heated. This may result in the energy source, a battery of a motor vehicle, being heavily loaded. In short-distance operation, it can therefore not be guaranteed that the battery will always be sufficiently recharged. In order to reduce the energy required for heating the honeycomb body, it has therefore already been proposed to provide the honeycomb body with thermal insulation. For example, WO 90/04087 discloses a honeycomb body with thermal insulation, which is designed in the form of a double jacket system. The double jacket system comprises an inner jacket tube which is arranged at a distance from an outer jacket tube in the latter. The space created between the inner and outer casing tubes acts as thermal insulation. As a result, a reduction in the heat dissipation by the surface area of the structure is reduced.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, die von einem Fluid durchströmbare Struktur so weiterzubilden, daß die Wärmeverluste der Struktur weiter verringert werden.The present invention has for its object to develop the structure through which a fluid flows so that the heat losses of the structure are further reduced.
Diese Aufgabe wird erfindungsgemäß durch von einem Fluid durchströmbare Struktur mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen und Ausgestaltungen der Struktur sind Gegenstand der Unteransprüche.According to the invention, this object is achieved by a structure through which a fluid can flow, with the features of claim 1. Advantageous further developments and refinements of the structure are the subject of the subclaims.
Die erfindungsgemäße Struktur zeichnet sich dadurch aus, daß diese wenigstens in der Nähe des Eintritts- und des Austrittsbereichs einen Abschnitt verringerter Wärmeleitfähigkeit aufweist. Überraschenderweise hat es sich gezeigt, daß bei einer Struktur, die als Wabenkörper für einen Abgaskataly- sator dient, die stirnseitigen Wärmeverluste durch Wärmeleitung an die mit der Struktur verbundenen Komponenten eines Abgassystems, sowie durch Konvektion des sich im Abgassystem befindenden Abgases, einen erheblichen Beitrag zu den gesamten Wärmeverlusten leistet. Zur Vermeidung dieser, insbesondere stirnseitigen Wärmeverluste, wird die erfindungsgemäße Struktur vorgeschlagen. Dadurch, daß in der Nähe des Eintritts- und des Austritts- bereichs ein Abschnitt verringerter Wärmeleitfähigkeit ausgebildet sind, wird eine weitgehend thermische Entkopplung der Struktur von benachbarten Bauteilen eines Abgassystems erzielt. Der Abschnitt, welcher eine verringerte Wärmeleitfähigkeit aufweist, erstreckt sich wenigstens teilweise in die Struk- tur hinein.The structure according to the invention is characterized in that it has a section of reduced thermal conductivity at least in the vicinity of the entry and exit areas. Surprisingly, it has been shown that in a structure which serves as a honeycomb body for an exhaust gas catalytic converter, the end-face heat losses due to heat conduction to the components of an exhaust system connected to the structure, as well as by convection of the exhaust gas located in the exhaust system, make a considerable contribution the total heat loss. The structure according to the invention is proposed in order to avoid this, in particular end-face heat loss. The fact that in the vicinity of the entry and exit area a section of reduced thermal conductivity are formed, a largely thermal decoupling of the structure of adjacent components of an exhaust system is achieved. The section which has a reduced thermal conductivity extends at least partially into the structure.
Dadurch, daß die Struktur in der Nähe des Eintritts- und des Austritts- bereichs jeweils einen Abschnitt verringerter Wärmeleitfähigkeit aufweist, werden die Wärme Verluste des mittleren Abschnitts verringert, wodurch der zwischen dem Eintritts- und Austrittsbereich liegende Abschnitt der Struktur über einen längeren Zeitraum auf einer höheren Temperatur liegt als dies bei den bekannten Strukturen der Fall ist. Hierdurch wird eine verbesserte Reinigungswirkung eines Abgases nach einem Wiederstart erreicht, da die Struktur zwischen dem Eintritts- und dem Austrittsbereich auf einem höheren Temperaturniveau liegt. Der Abschnitt zwischen dem Eintritts- und dem Austrittsbereich erwärmt sich folglich wesentlich schneller, wodurch auch die zur katalytischen Umsetzung notwendige Temperatur rascher erreicht wird.Because the structure has a section of reduced thermal conductivity in the vicinity of the entry and exit areas, the heat losses of the middle section are reduced, as a result of which the section of the structure lying between the entry and exit areas is on a longer period of time is higher temperature than is the case with the known structures. In this way, an improved cleaning effect of an exhaust gas after a restart is achieved, since the structure between the entry and the exit area is at a higher temperature level. The section between the inlet and the outlet area consequently heats up much faster, as a result of which the temperature required for the catalytic conversion is also reached more quickly.
Bevorzugt ist eine Ausgestaltung der Struktur, bei der sich der Abschnitt der verringerten Wärmeleitfähigkeit über den gesamten Querschnitt der Struktur erstreckt. Eine Verringerung der Wärmeleitfähigkeit der Struktur kann dadurch erzielt werden, daß die Wandung wenigstens eine ihrer Kanäle mindestens teilweise mit verringerter Wanddicke ausgebildet ist. Hierdurch wird der Querschnitt in Wärmetransportrichtung verringert.An embodiment of the structure is preferred in which the section of reduced thermal conductivity extends over the entire cross section of the structure. A reduction in the thermal conductivity of the structure can be achieved in that the wall is at least partially designed with a reduced wall thickness at least one of its channels. As a result, the cross section in the heat transport direction is reduced.
Nach einer weiteren vorteilhaften Ausgestaltung der Struktur wird vorgeschlagen, daß der Abschnitt der verringerten Wärmeleitfähigkeit dadurch gebildet wird, daß die Wandung wenigstens einer der Kanäle mindestens eine Ausnehmung aufweist. Bei einer solchen Ausgestaltung der Struktur wird der zum Wärmetransport zur Verfügung gestellte Querschnitt der Struktur ver- ringert. Es ist jedoch zu beachten, daß durch Ausbildung der Ausnehmungen in der Wandung der Kanäle die Festigkeit der Struktur beeinträchtigen kann. Eine solche Beeinträchtigung der Festigkeit der Struktur tritt nicht ein, wenn der Abschnitt, ohne Ausnehmungen, jedoch aus einem wärmeisolierendem Werkstoff besteht.According to a further advantageous embodiment of the structure, it is proposed that the section of reduced thermal conductivity be formed by the wall of at least one of the channels having at least one recess. With such a configuration of the structure, the cross section of the structure made available for heat transport is used. wrestles. However, it should be noted that the formation of the recesses in the wall of the channels can impair the strength of the structure. Such an impairment of the strength of the structure does not occur if the section, without recesses, is made of a heat-insulating material.
Die Ausbildung von Ausnehmungen in einer Struktur kann vor, während oder nach dem Herstellungsvorgang der Struktur, erfolgen. Wird die Struktur durch gewickelte und/oder geschichtete Lagen wenigstens teilweise struktu- rierter Bleche gebildet, so ist die Ausbildung der Ausnehmungen vor dem Wickeln oder Schichten der Lagen der Bleche vorzunehmen.The formation of recesses in a structure can take place before, during or after the manufacturing process of the structure. If the structure is formed by wound and / or layered layers of at least partially structured sheets, the recesses must be formed before the layers of the sheets are wound or layered.
Eine von einem Fluid durchströmbare Struktur, die in der Nähe des Eintritts- und des Austrittsbereiches jeweils einen Abschnitt verringerter Wärme- leitfähigkeit aufweist, ist besonderes als Wabenkörper für einen Abgaskatalysator geeignet. Bevorzugt ist ein solcher Wabenkörper in einem Mantelrohr angeordnet, wobei das Mantelrohr in der Nähe des Eintritts- und des Austrittsbereichs einen Abschnitt verringerter Wärmeleitfähigkeit aufweist. Hierzu wird vorgeschlagen, daß der Abschnitt durch Ausnehmungen im Mantelrohr gebildet ist. Bei den Ausnehmungen im Mantelrohr bzw. in der Struktur, insbesondere in dem Wabenkörper, kann es sich um Perforationen handeln. Der Abschnitt der verringerten Wärmeleitfähigkeit ist vorzugsweise fluchtend angeordnet. Der bereits vorstehend dargelegte Zusammenhang zwischen der körperlichen Ausgestaltung der Struktur und dem Erreichen einer zur kataly- tischen Umsetzung eines Abgases notwendigen Temperatur nach einem Wiederstart einer Verbrennungskraftmaschine wird noch weiter verstärkt, wenn das Mantelrohr, in dem sich die Struktur als ein Wabenkörper angeordnet ist, im Eintritts- und Austrittsbereich jeweils einen Abschnitt verringerter Wärmeleitfähigkeit aufweist. Hierdurch wird erreicht, daß die Wärmeleitung vom Mantelrohr zu benachbarten Bauteilen eines Abgassystems signifikant verringert wird.A structure through which a fluid can flow and which in the vicinity of the inlet and outlet areas each have a section of reduced thermal conductivity is particularly suitable as a honeycomb body for an exhaust gas catalytic converter. Such a honeycomb body is preferably arranged in a jacket tube, the jacket tube having a section of reduced thermal conductivity in the vicinity of the inlet and outlet regions. For this purpose, it is proposed that the section be formed by recesses in the casing tube. The recesses in the casing tube or in the structure, in particular in the honeycomb body, can be perforations. The section of the reduced thermal conductivity is preferably arranged in alignment. The relationship already explained above between the physical configuration of the structure and the reaching of a temperature necessary for the catalytic conversion of an exhaust gas after a restart of an internal combustion engine is further strengthened if the casing tube, in which the structure is arranged as a honeycomb body, in the Entry and exit areas each have a section of reduced thermal conductivity. This ensures that the Heat conduction from the casing pipe to neighboring components of an exhaust system is significantly reduced.
Weitere Vorteile und Merkmale der Erfindung werden anhand der in der Zeichnung dargestellten Ausführungsbeispiele erläutert. Es zeigen:Further advantages and features of the invention are explained on the basis of the exemplary embodiments shown in the drawing. Show it:
Figur 1 schematisch ein erstes Ausführungsbeispiel eines Wabenkörpers undFigure 1 shows schematically a first embodiment of a honeycomb body and
Figur 2 schematisch ein zweites Ausführungsbeispiel eines Wabenkörpers in einem Abgassystem.Figure 2 schematically shows a second embodiment of a honeycomb body in an exhaust system.
Figur 1 zeigt einen von einem Fluid durchströmbaren Wabenkörper 1. Der Wabenkörper 1 hat einen Eintrittsbereich 2 und einen Austrittsbereich 3. Der Eintrittsbereich 2 und der Austrittsbereich 3 sind durch für ein Fluid durchströmbare Kanäle 4 miteinander verbunden. Die Struktur 1 ist in einem Mantelrohr 5 angeordnet. In der Nähe des Eintrittsbereichs 2 ist in der Struktur 1 ein Abschnitt 6 mit verringerter Wärmeleitfähigkeit ausgebildet. Der Abschnitt 6 ist durch Ausnehmungen 7 gebildet. Die Ausnehmungen 7 sind in der Wandung 8 der Kanäle 4 ausgebildet und erstrecken sich wenigstens teilweise quer zur Strömungsrichtung des Fluids F. In der Nähe des Austrittsbereichs 3 sind Ausnehmungen 10 ausgebildet, die einen Abschnitt 10 einer verringerten Wärmeleitfähigkeit bilden. Die Ausnehmungen 9 sind in der Wandung 8 der Kanäle 4 eingebracht. Auch der Mantel 5 weist einen Abschnitt 11 und einen Abschnitt 12 verringerter Wärmeleitfähigkeit im Eintritts- bzw. Austrittsbereich 2, 3 der Struktur 1 auf. Die Abschnitte 11 , 12 sind durch Ausnehmungen 13 bzw. 14 gebildet. In dem in der Figur 1 dargestellten Ausführungsbeispiel sind die Ausnehmungen 7, 9, 13 bzw. 14 der Abschnitte 6, 10, 11 bzw. 12 langlochförmig ausgestaltet. Sie sind sowohl im Mantelrohr 5 als auch in der Struktur 1 gleich ausgebildet. - o -FIG. 1 shows a honeycomb body 1 through which a fluid can flow. The honeycomb body 1 has an entry area 2 and an exit area 3. The entry area 2 and the exit area 3 are connected to one another by channels 4 through which a fluid can flow. The structure 1 is arranged in a jacket tube 5. A section 6 with reduced thermal conductivity is formed in the structure 1 near the entry region 2. Section 6 is formed by recesses 7. The recesses 7 are formed in the wall 8 of the channels 4 and extend at least partially transversely to the direction of flow of the fluid F. In the vicinity of the outlet region 3, recesses 10 are formed, which form a section 10 of reduced thermal conductivity. The recesses 9 are made in the wall 8 of the channels 4. The jacket 5 also has a section 11 and a section 12 of reduced thermal conductivity in the entry or exit area 2, 3 of the structure 1. The sections 11, 12 are formed by recesses 13 and 14, respectively. In the exemplary embodiment shown in FIG. 1, the recesses 7, 9, 13 and 14 of the sections 6, 10, 11 and 12 are configured in the form of an elongated hole. They are of identical design both in the casing tube 5 and in the structure 1. - o -
Alternativ können die Ausnehmungen 13 einen kreisförmigen Querschnitt aufweisen, wie dies die Figur 2 zeigt. Die Ausnehmungen sind vorzugsweise 5 bis 15 mm hinter der jeweiligen Stirnfläche der Struktur in einer Ebene ausgebildet. Die Figur 2 zeigt die Anordnung einer Struktur 1 in einem Abgassystem einer Verbrennungskraftmaschine. Die Struktur 1 weist ein Mantelrohr 5 auf, welches in der Nähe des Eintrittsbereichs 2 Ausnehmungen 13 und in der Nähe des Austrittsbereichs 3 Ausnehmungen 14 auf. Der Mantel 5 der Struktur 1 ist von einem Isoliermaterial 15 umgeben. Dieses Isoliermaterial 15 ist von einem äußeren Mantelrohr 16 umgeben. Vor dem Eintrittsbereich 2 ist ein Diffusor 17 ausgebildet, der mit dem äußeren Mantelrohr 16 verbunden ist. Am Austrittsbereich 3 ist ein Konfusor 18 ausgebildet, der mit dem äußeren Mantelrohr 16 verbunden ist. Durch die Abschnitte 11 bzw. 12 des äußeren Mantelrohrs 5 und ebenfalls die Abschnitte 6 bzw. 9 der Struktur 1, die vorzugsweise aus geschichteten oder gewickelten Blechen besteht, wird die Wärmeabgabe aus dem Zentrum der Struktur 1 zum Konfusor bzw. Diffusor bzw. in die davor bestehenden Gasräume verringert. Hierdurch erzielt man eine im wesentlichen heiße "Zelle", die von der thermischen Isolierung 15 sowie die Abschnitte verringerter Wärmeleitfähigkeit begrenzt ist. Hierdurch wird eine energetisch günstigere Ausgestaltung eines Abgasreinigungssystems erzielt. Alternatively, the recesses 13 can have a circular cross section, as shown in FIG. 2. The recesses are preferably formed 5 to 15 mm behind the respective end face of the structure in one plane. FIG. 2 shows the arrangement of a structure 1 in an exhaust system of an internal combustion engine. The structure 1 has a tubular casing 5 which has recesses 13 in the vicinity of the inlet region 2 and recesses 14 in the vicinity of the outlet region 3. The jacket 5 of the structure 1 is surrounded by an insulating material 15. This insulating material 15 is surrounded by an outer jacket tube 16. A diffuser 17 is formed in front of the entry area 2 and is connected to the outer casing tube 16. At the outlet area 3, a confuser 18 is formed, which is connected to the outer jacket tube 16. Through the sections 11 and 12 of the outer casing tube 5 and also the sections 6 and 9 of the structure 1, which preferably consists of layered or wound metal sheets, the heat emission from the center of the structure 1 to the confuser or diffuser or into the existing gas spaces reduced. This results in an essentially hot "cell", which is limited by the thermal insulation 15 and the sections of reduced thermal conductivity. As a result, an energetically more favorable configuration of an exhaust gas cleaning system is achieved.
- 1 -- 1 -
BezugszeichenlisteReference list
1 Struktur1 structure
2 Eintrittsbereich2 entrance area
3 Austrittsbereich3 exit area
4 Kanal4 channel
5 Mantelrohr5 jacket tube
6 Abschnitt6 section
7 Ausnehmung7 recess
8 Wandung8 wall
9 Ausnehmung9 recess
10 Abschnitt10 section
11, 12 Abschnitt11, 12 section
13,14 Ausnehmung13.14 recess
15 Isolierung15 insulation
16 äußeres Mantelrohr16 outer jacket tube
17 Diffusor17 diffuser
18 Konfusor 18 confuser

Claims

PATENTANSPRÜCHE PATENT CLAIMS
1. Von einem Fluid durchströmbare Struktur (1), insbesondere Wabenkörper für einen Abgaskatalysator, mit einem Eintrittsbereich (2), der durch für ein Fluid durchströmbare Kanäle (4) mit einem Austrittsbereich (3) verbunden ist, dadurch gekennzeichnet, daß die Struktur (1) in der Nähe des Eintritts- und des Austrittsbereichts (2, 3) jeweils einen Abschnitt (6, 10) verringerter Wärmeleitfähigkeit aufweist.1. Structure (1) through which fluid can flow, in particular honeycomb body for an exhaust gas catalytic converter, with an inlet region (2) which is connected to an outlet region (3) through channels (4) through which fluid can flow, characterized in that the structure ( 1) in the vicinity of the entry and exit areas (2, 3) each have a section (6, 10) of reduced thermal conductivity.
2. Struktur nach Anspruch 1, dadurch gekennzeichnet, daß der Abschnitt (6, 10) der verringerter Wärmeleitfähigkeit sich über den gesamten Querschnitt der Struktur (1) erstreckt.2. Structure according to claim 1, characterized in that the section (6, 10) of reduced thermal conductivity extends over the entire cross section of the structure (1).
3. Struktur nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß in dem Abschnitt (6, 10) die Wandung (8) wenigstens einiger Kanäle (4) mindestens teilweise mit verringerter Wanddicke ausgebildet ist.3. Structure according to claim 1 or 2, characterized in that in the section (6, 10) the wall (8) of at least some channels (4) is at least partially formed with a reduced wall thickness.
4. Struktur nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß in dem Abschnitt (6, 10) die Wandung (8) wenigstens einiger der Kanäle (4) mindestens eine Ausnehmung (7, 9) aufweist.4. Structure according to claim 1, 2 or 3, characterized in that in the section (6, 10) the wall (8) of at least some of the channels (4) has at least one recess (7, 9).
5. Struktur nach einem der Ansprüche 1 bis 4, daß der Abschnitt (6, 10) aus einem wärmeisolierendem Werkstoff besteht.5. Structure according to one of claims 1 to 4, that the section (6, 10) consists of a heat insulating material.
6. Struktur nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Struktur durch gewickelte und/oder geschichtete Lagen wenigstens teilweise strukturierter Bleche gebildet ist.6. Structure according to one of claims 1 to 5, characterized in that the structure is formed by wound and / or layered layers of at least partially structured sheets.
7. Wabenkörper für einen Abgaskatalysator, gekennzeichnet durch eine Struktur nach einem der Ansprüche 1 bis 6. 7. honeycomb body for an exhaust gas catalytic converter, characterized by a structure according to one of claims 1 to 6.
8. Wabenkörper nach Anspruch 7, dadurch gekennzeichnet, daß dieser in einem Mantelrohr (5) angeordnet ist, wobei das Mantelrohr (5) in der Nähe des Eintritts- und des Austrittsbereichts (2, 3) einen Abschnitt (11, 12) verringerter Wärmeleitfähigkeit aufweist.8. honeycomb body according to claim 7, characterized in that it is arranged in a jacket tube (5), the jacket tube (5) in the vicinity of the inlet and outlet region (2, 3) a portion (11, 12) of reduced thermal conductivity having.
9. Wabenkörper nach Anspruch 8, dadurch gekennzeichnet, daß der Abschnitt (11, 12) im Mantelrohr (5) mit dem Abschnitt (6, 10) der Strukmr (1) fluchtet.9. honeycomb body according to claim 8, characterized in that the section (11, 12) in the casing tube (5) with the section (6, 10) of the structure (1) is aligned.
10. Wabenkörper nach Anspruch 8 oder 9, dadurch gekennzeichnet, daß der Abschmtt (11 , 12) durch Ausnehmungen (13, 14) im Mantelrohr (5) gebildet ist. 10. honeycomb body according to claim 8 or 9, characterized in that the Abmtt (11, 12) through recesses (13, 14) is formed in the tubular casing (5).
EP97944887A 1996-09-26 1997-09-17 Honeycomb body with reduced heat conductivity in inflow and outflow areas Expired - Lifetime EP0929739B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19639633 1996-09-26
DE19639633A DE19639633A1 (en) 1996-09-26 1996-09-26 Honeycomb body with reduced thermal conductivity in the entry and exit area
PCT/EP1997/005096 WO1998013590A1 (en) 1996-09-26 1997-09-17 Honeycomb body with reduced heat conductivity in inflow and outflow areas

Publications (2)

Publication Number Publication Date
EP0929739A1 true EP0929739A1 (en) 1999-07-21
EP0929739B1 EP0929739B1 (en) 2001-12-05

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EP (1) EP0929739B1 (en)
JP (1) JP4098363B2 (en)
KR (1) KR100307076B1 (en)
AU (1) AU4623697A (en)
DE (2) DE19639633A1 (en)
WO (1) WO1998013590A1 (en)

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Publication number Priority date Publication date Assignee Title
JP2011194382A (en) * 2010-03-24 2011-10-06 Ngk Insulators Ltd Honeycomb structure
DE102011081493B4 (en) 2011-08-24 2023-05-11 Bayerische Motoren Werke Aktiengesellschaft Catalyst support for a catalyst, catalyst and method of making a catalyst

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Publication number Priority date Publication date Assignee Title
DE2549255A1 (en) * 1975-11-04 1977-05-05 Volkswagenwerk Ag CATALYTIC CLEANING SYSTEM FOR COMBUSTION ENGINE EXHAUST GASES
DE8816514U1 (en) 1988-04-25 1989-10-26 Emitec Emissionstechnologie
DE3822944A1 (en) * 1988-07-07 1990-01-11 Leistritz Ag Exhaust gas catalyst
BR8907458A (en) 1988-09-22 1991-04-02 Emitec Emissionstechnologie ALVEOLAR BODY, ESPECIALLY CATALYST SUPPORT BODY, CONSTITUTED OF A MULTIPLICITY OF INTERLACED PLATE STACKS
DE8812762U1 (en) 1988-10-11 1989-06-29 Emitec Emissionstechnologie
JPH0634927B2 (en) * 1989-11-16 1994-05-11 トヨタ自動車株式会社 Metal carrier for exhaust gas purification catalyst
JPH08103664A (en) * 1994-10-04 1996-04-23 Nippondenso Co Ltd Honeycomb body and catalytic converter having catalyst carrier consisting of the honeycomb body
US5549873A (en) * 1994-02-18 1996-08-27 Volkswagen Ag Exhaust gas converter arrangement
BR9509031A (en) * 1994-09-26 1998-06-23 Emitec Emissionstechnologie Microstructures in cross arrangement
DE4437718A1 (en) * 1994-10-21 1996-04-25 Emitec Emissionstechnologie Catalyst carrier body with an inner insulation

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Title
See references of WO9813590A1 *

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AU4623697A (en) 1998-04-17
JP4098363B2 (en) 2008-06-11
KR100307076B1 (en) 2001-09-24
JP2001500785A (en) 2001-01-23
KR20000048657A (en) 2000-07-25
DE59705700D1 (en) 2002-01-17
EP0929739B1 (en) 2001-12-05
DE19639633A1 (en) 1998-04-02
WO1998013590A1 (en) 1998-04-02

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