EP1188907A2 - Method and apparatus for regeneration of loaded soot filters - Google Patents

Method and apparatus for regeneration of loaded soot filters Download PDF

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Publication number
EP1188907A2
EP1188907A2 EP01120085A EP01120085A EP1188907A2 EP 1188907 A2 EP1188907 A2 EP 1188907A2 EP 01120085 A EP01120085 A EP 01120085A EP 01120085 A EP01120085 A EP 01120085A EP 1188907 A2 EP1188907 A2 EP 1188907A2
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EP
European Patent Office
Prior art keywords
filter
exhaust gas
exhaust
partial
heating
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EP01120085A
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German (de)
French (fr)
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EP1188907A3 (en
Inventor
Willi Müller
Henning Von Watzdorf
Hans Houben
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BorgWarner Ludwigsburg GmbH
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Beru AG
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Publication of EP1188907A2 publication Critical patent/EP1188907A2/en
Publication of EP1188907A3 publication Critical patent/EP1188907A3/en
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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
    • F01N3/027—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 electric or magnetic heating means

Definitions

  • gases and in particular exhaust gases here in particular exhaust gases from diesel engines with soot filters cleaned.
  • the filter loaded with particles can be regenerated that the gas or exhaust gas temperature before Entry into the filter is raised to a temperature that ignition of the particles collected in the filter and a glow combustion spreading in the soot filter Load maintains.
  • the required increase in exhaust gas temperature is here, for example, by electrical auxiliary heaters achieved.
  • the ignition temperature of the particles with which the filter is loaded depends on the composition of the exhaust gases, the oxygen concentration, the use of fuel additives, of the filter material, the filter temperature and possibly other parameters, for example with diesel engines not in all operating conditions, the regeneration of the loaded filters To achieve or generate exhaust gas temperature.
  • the object of the invention is a method and Device for the regeneration of loaded soot filters, in particular of soot filters from diesel engines make the less energy consuming and easier than are known to be realized.
  • the exhaust pipe 1 in which the soot filter 2 is arranged, and through which the soot filter 2 Exhaust gas 6 is supplied by heating means in the form of a partial flow heater 3 divided into an area where a Partial flow of the exhaust gas 6 is additionally heated during the other partial flow unimpeded and without additional heating enters filter 2.
  • a heating tape 4 is provided, for example approximately Fills half of the pipe cross section and in the direction of flow extending column-shaped channels through which the exhaust gas partial flow passes under heating. The remaining area of the exhaust pipe 1 remains from the partial flow heater free so that through this area of the tube the exhaust gas 6 without additional heating in the filter 2 can occur.
  • the partial flow heater 3 in the form of the heating tape 4 is so close to the entrance surface of the soot filter 2, that the heated partial flow and the unheated Partial stream can not mix practically. dimensioning and heating power of the partial flow heater 3 in the form of the heating tape 4 are chosen such that the additionally heated Exhaust gas partial flow with such a temperature in the Filter 2 occurs, which is suitable for igniting the particles, or a self-supporting glow combustion of the load to initiate filter 2.
  • the partial flow heater 3, here designed as a heating tape 4 can advantageously be made from conductive ceramic his; but also other heating elements, for example Semiconductor-based or metal-based can be used.
  • the embodiment according to FIG. 2 essentially corresponds 1, wherein the reference numerals the predetermined Have meaning; the present embodiment differs from that of FIG. 1 in that as Partial flow heater 3 uses a honeycomb heating element 5 that is ring-shaped in the exhaust pipe inside and in immediate Is adjacent to the inlet surface of the filter 2; In this way, a multitude of themselves in the direction of flow extending channels for the passage of a annular exhaust gas partial flow is formed, which additionally heats is, while a tubular channel in the middle of the tube for unhindered passage of the other partial exhaust gas flow remains.
  • FIG. 3 Another preferred embodiment of the invention is shown in Figure 3.
  • a tubular Filter housing 1 with a diameter of about 15 cm the particle filter 2 arranged.
  • a honeycomb Partial flow heater 4 arranged centrally in the housing 1; this Partial flow heater 4 has an approximately square in the present case Cross-section and an edge length of approximately 6 cm.
  • the electrical contact 3 is, for example, plug-shaped on the entry surface of the engine exhaust 6 in the honeycomb partial flow heater 4 arranged.
  • a temperature the engine exhaust 6 is assumed to be about 100 degrees C; this Engine exhaust 6 is shaped by the arrangement of the honeycomb Partial flow heater 4 in an approximately annular partial flow unchanged temperature, the side of the partial flow heater 4 in the direction of the particle filter 2 without additional Heating flows around, and a second partial flow, of the honeycomb-shaped partial flow heater 4 with heating For example, about 650 degrees C passes through and with this Temperature enters the particle filter 2.
  • a major advantage of the preferred according to the invention Use of a honeycomb partial flow heater, in particular according to the embodiment according to FIG. 3 described here exists in its compact form, which is the transfer of the electrical power to the exhaust gas in a small volume enables which in turn is relatively small sizes of the particle filter system allowed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

Before passing through the filter the exhaust gas is heated up by heating means (3) and at least one partial stream of exhaust gas inside the exhaust pipe (1) is additionally heated so that the partial stream enters the filter at a higher temperature than the other exhaust gas stream. Independent claim describes regenerating device with heating means (3) in exhaust pipe which divides gas stream into at least two partial streams so that one is additionally heated to higher temperature. The heating means can be made from conductive ceramic. It can be a heating strip (4) set in the region of the exhaust pipe to form split channels.

Description

Bekannterweise werden Gase und insbesondere Abgase, hier insbesondere Abgase von Dieselmotoren, mit Rußfiltern gereinigt. Die mit Partikel beladenen Filter können dadurch regeneriert werden, daß die Gas- bzw. Abgastemperatur vor Eintritt in den Filter auf eine Temperatur erhöht wird, die eine Entzündung der im Filter gesammelten Partikel bewirkt und eine im Rußfilter sich ausbreitende Glimmverbrennung der Beladung unterhält. Die erforderliche Erhöhung der Abgastemperatur wird hierbei beispielsweise durch elektrische Zuheizer erzielt.As is known, gases and in particular exhaust gases, here in particular exhaust gases from diesel engines with soot filters cleaned. The filter loaded with particles can be regenerated that the gas or exhaust gas temperature before Entry into the filter is raised to a temperature that ignition of the particles collected in the filter and a glow combustion spreading in the soot filter Load maintains. The required increase in exhaust gas temperature is here, for example, by electrical auxiliary heaters achieved.

Da die Zündtemperatur der Partikel, mit dem der Filter beladen ist, abhängig ist von der Zusammensetzung der Abgase, der Sauerstoffkonzentration, der Verwendung von Kraftstoffadditiven, von dem Filtermaterial, der Filtertemperatur und gegebenenfalls weiteren Parametern, gelingt es beispielsweise bei Dieselmotoren nicht in allen Betriebszuständen, die zur Regeneration der beladenen Filter erforderliche Abgastemperatur zu erzielen bzw. zu erzeugen.Because the ignition temperature of the particles with which the filter is loaded, depends on the composition of the exhaust gases, the oxygen concentration, the use of fuel additives, of the filter material, the filter temperature and possibly other parameters, for example with diesel engines not in all operating conditions, the regeneration of the loaded filters To achieve or generate exhaust gas temperature.

Bei der bekannten Zusatzheizung mittels elektrischem Zuheizer wird der Abgasstrom aufgeheizt; hierbei hat sich als nachteilig herausgestellt, daß insbesondere der energetische Aufwand zur ausreichenden Aufheizung beispielsweise bei niedrigen Betriebszuständen eines Dieselmotors, sehr hoch ist; die notwendige elektrische Leistung ist oftmals nicht von den zur Verfügung stehenden Leistungsquellen zu erbringen.In the known additional heating by means of electrical The exhaust gas stream is heated up in the auxiliary heater; here has found to be disadvantageous that in particular the energetic Effort for sufficient heating, for example at low operating conditions of a diesel engine, very much is high; the necessary electrical power is often not from the available power sources provide.

Aufgabe der Erfindung ist es, ein Verfahren und eine Vorrichtung zur Regeneration von beladenen Rußfiltern, insbesondere von Rußfiltern von Dieselmotoren, zur Verfügung zu stellen, die weniger energieverbrauchend und einfacher als vorbekannt zu realisieren sind.The object of the invention is a method and Device for the regeneration of loaded soot filters, in particular of soot filters from diesel engines make the less energy consuming and easier than are known to be realized.

Die erfindungsgemäße Aufgabe wird durch das Verfahren nach den Ansprüchen 1 bis 3 und der Vorrichtung nach den Ansprüchen 4 bis 7 gelöst.The object of the invention is achieved by the method according to claims 1 to 3 and the device according to the Claims 4 to 7 solved.

Die Erfindung wird am Beispiel einer üblichen Abgasanlage eines Dieselmotors in einem Kraftfahrzeug anhand der Figuren 1,2 und 3 näher erläutert. Hierbei zeigt

  • Fig. 1 eine schematische Darstellung einer Abgasanlage mit Rußfilter und der erfindungsgemäßen Teilstromaufheizung mit einem Heizband; und
  • Fig. 2 eine schematische Darstellung einer gleichen Abgasanlage mit erfindungsgemäßer Teilstromaufheizung durch einen wabenförmigen Zuheizer.
  • Fig. 3 ist eine schematische Darstellung einer weiteren bevorzugten Ausführungsform einer Abgasanlage mit erfindungsgemäßer Teilstromaufheizung durch eine weitere Ausführungsform eines wabenförmigen Zuheizers.
    • The invention is explained in more detail using the example of a conventional exhaust system of a diesel engine in a motor vehicle with reference to FIGS. 1, 2 and 3. Here shows
  • Figure 1 is a schematic representation of an exhaust system with a soot filter and the partial flow heating according to the invention with a heating tape. and
  • Fig. 2 is a schematic representation of the same exhaust system with partial flow heating according to the invention by a honeycomb heater.
  • FIG. 3 is a schematic illustration of a further preferred embodiment of an exhaust gas system with partial flow heating according to the invention through a further embodiment of a honeycomb-type auxiliary heater.

    • Erfindungsgemäß wird das Abgasrohr 1, in dem der Rußfilter 2 angeordnet ist, und durch das dem Rußfilter 2 das Abgas 6 zugeführt wird, durch Heizmittel in Form eines Teilstromzuheizers 3 in einen Bereich unterteilt, in dem ein Teilstrom des Abgases 6 zusätzlich erhitzt wird, während der andere Teilstrom ungehindert und ohne zusätzliche Erhitzung in den Filter 2 eintritt. Bei der Ausführungsform gemäß Fig. 1 ist ein Heizband 4 vorgesehen, das beispielsweise etwa die Hälfte des Rohrquerschnitts ausfüllt und sich in Strömungsrichtung erstreckende spaltenförmige Kanäle bildet, durch die der Abgasteilstrom unter Aufheizung hindurchtritt. Der verbleibende Bereich des Abgasrohres 1 bleibt von dem Teilstromzuheizer frei, so daß durch diesen Bereich des Rohres das Abgas 6 ohne zusätzliche Aufheizung in den Filter 2 eintreten kann.According to the exhaust pipe 1, in which the soot filter 2 is arranged, and through which the soot filter 2 Exhaust gas 6 is supplied by heating means in the form of a partial flow heater 3 divided into an area where a Partial flow of the exhaust gas 6 is additionally heated during the other partial flow unimpeded and without additional heating enters filter 2. In the embodiment according to FIG. 1, a heating tape 4 is provided, for example approximately Fills half of the pipe cross section and in the direction of flow extending column-shaped channels through which the exhaust gas partial flow passes under heating. The remaining area of the exhaust pipe 1 remains from the partial flow heater free so that through this area of the tube the exhaust gas 6 without additional heating in the filter 2 can occur.

    Der Teilstromzuheizer 3 in Form des Heizbandes 4 wird so dicht an die Eintrittsfläche des Rußfilters 2 gesetzt, daß sich der aufgeheizte Teilstrom und der nicht aufgeheizte Teilstrom praktisch nicht vermischen können. Dimensionierung und Heizleistung des Teilstromzuheizers 3 in Form des Heizbandes 4 werden derart gewählt, daß der zusätzlich aufgeheizte Abgasteilstrom mit einer solchen Temperatur in den Filter 2 eintritt, die geeignet ist, die Partikel zu entzünden, bzw. eine selbsttragende Glimmverbrennung der Beladung des Filters 2 zu initiieren.The partial flow heater 3 in the form of the heating tape 4 is so close to the entrance surface of the soot filter 2, that the heated partial flow and the unheated Partial stream can not mix practically. dimensioning and heating power of the partial flow heater 3 in the form of the heating tape 4 are chosen such that the additionally heated Exhaust gas partial flow with such a temperature in the Filter 2 occurs, which is suitable for igniting the particles, or a self-supporting glow combustion of the load to initiate filter 2.

    Der Teilstromzuheizer 3, hier als Heizband 4 ausgebildet, kann vorteilhaft aus leitfähiger Keramik hergestellt sein; aber auch andere Heizelemente, beispielsweise auf Halbleiterbasis oder auf Metallbasis können Verwendung finden.The partial flow heater 3, here designed as a heating tape 4, can advantageously be made from conductive ceramic his; but also other heating elements, for example Semiconductor-based or metal-based can be used.

    Die Ausführungsform gemäß Fig. 2 entspricht im wesentlichen der gemäß Fig. 1, wobei die Bezugszeichen die vorgegebene Bedeutung besitzen; die vorliegende Ausführungsform unterscheidet sich von der gemäß Fig. 1 dadurch, daß als Teilstromzuheizer 3 ein wabenförmiges Heizelement 5 verwendet wird, das ringförmig dem Abgasrohr innen und in unmittelbarer Nachbarschaft zur Eintrittsfläche des Filters 2 anliegt; auf diese Weise wird eine Vielzahl von sich in Strömungsrichtung erstreckenden Kanälen zum Durchtritt eines ringförmigen Abgasteilstromes gebildet, der zusätzlich erhitzt wird, während ein rohrförmiger Kanal mittig im Rohr zum ungehinderten Durchtritt des anderen Abgasteilstromes verbleibt.The embodiment according to FIG. 2 essentially corresponds 1, wherein the reference numerals the predetermined Have meaning; the present embodiment differs from that of FIG. 1 in that as Partial flow heater 3 uses a honeycomb heating element 5 that is ring-shaped in the exhaust pipe inside and in immediate Is adjacent to the inlet surface of the filter 2; In this way, a multitude of themselves in the direction of flow extending channels for the passage of a annular exhaust gas partial flow is formed, which additionally heats is, while a tubular channel in the middle of the tube for unhindered passage of the other partial exhaust gas flow remains.

    Eine weitere bevorzugte Ausführungsform der Erfindung wird in Figur 3 wiedergegeben. Hierbei ist in einem rohrförmigen Filtergehäuse 1 mit einem Durchmesser von etwa 15 cm der Partikelfilter 2 angeordnet. Vor diesem (bezogen auf die Strömungsrichtung des Motorabgases) ist ein wabenförmiger Teilstromheizer 4 zentrisch im Gehäuse 1 angeordnet; dieser Teilstromheizer 4 hat im vorliegenden Fall einen etwa quadratischen Querschnitt und einer Kantenlänge von ungefähr 6 cm. Die elektrische Kontaktierung 3 ist beispielsweise stekkerförmig auf der Eintrittsfläche des Motorabgases 6 in den wabenförmigen Teilstromheizer 4 angeordnet.Another preferred embodiment of the invention is shown in Figure 3. Here is in a tubular Filter housing 1 with a diameter of about 15 cm the particle filter 2 arranged. Before this (related to the Direction of flow of the engine exhaust) is a honeycomb Partial flow heater 4 arranged centrally in the housing 1; this Partial flow heater 4 has an approximately square in the present case Cross-section and an edge length of approximately 6 cm. The electrical contact 3 is, for example, plug-shaped on the entry surface of the engine exhaust 6 in the honeycomb partial flow heater 4 arranged.

    Bei dieser Ausführungsform wird von einer Temperatur des Motorabgases 6 von etwa 100 Grad C ausgegangen; dieses Motorabgas 6 wird durch die Anordnung des wabenförmigen Teilstromheizers 4 in einen etwa ringförmigen Teilstrom unveränderter Temperatur geteilt, der seitwärts den Teilstromheizer 4 in Richtung auf den Partikelfilter 2 ohne zusätzliche Erhitzung umfließt, sowie einen zweiten Teilstrom, der den wabenförmigen Teilstromheizer 4 unter Erhitzung auf beispielsweise etwa 650 Grad C durchtritt und mit dieser Temperatur in den Partikelfilter 2 eintritt.In this embodiment, a temperature the engine exhaust 6 is assumed to be about 100 degrees C; this Engine exhaust 6 is shaped by the arrangement of the honeycomb Partial flow heater 4 in an approximately annular partial flow unchanged temperature, the side of the partial flow heater 4 in the direction of the particle filter 2 without additional Heating flows around, and a second partial flow, of the honeycomb-shaped partial flow heater 4 with heating For example, about 650 degrees C passes through and with this Temperature enters the particle filter 2.

    Ein wesentlicher Vorteil der erfindungsgemäß bevorzugten Nutzung eines wabenförmigen Teilstromheizers, insbesondere gemäß hier beschriebende Ausführungsform nach Figur 3 besteht in seiner kompakten Form, die die Übertragung der elektrischen Leistung auf das Abgas in kleinem Volumen ermöglicht, was wiederum relativ kleine Baugrößen des Partikelfiltersystems erlaubt. A major advantage of the preferred according to the invention Use of a honeycomb partial flow heater, in particular according to the embodiment according to FIG. 3 described here exists in its compact form, which is the transfer of the electrical power to the exhaust gas in a small volume enables which in turn is relatively small sizes of the particle filter system allowed.

    In Kenntnis dieses Lösungsprinzips ist es jedem Durchschnittsfachmann möglich, durch entsprechende Versuche die Dimension des Teilstromzuheizers 3 und dessen Heizleitung in Abhängigkeit von dem Querschnitt des Abgasrohres bzw. Filtergehäuses 1, Menge, Eintrittstemperatur, Art und Belastung des Abgasstromes 6 zu bestimmen, ohne hierbei erfinderisch werden zu müssen.Knowing this principle of solution, it is every average specialist possible through appropriate experiments Dimension of the partial flow heater 3 and its heating line in Dependence on the cross section of the exhaust pipe or filter housing 1, quantity, inlet temperature, type and load to determine the exhaust gas flow 6 without being inventive to have to.

    Besonders vorteilhaft an dem erfindungsgemäßen Verfahren bzw. an der erfindungsgemäßen Vorrichtung ist der Umstand, daß die Aufteilung des Abgasstromes in einen zusätzlich aufzuheizenden Teilstrom und einen nicht zusätzlich aufzuheizenden Teilstrom durch konstruktive Ausbildung des Teilstromzuheizers 3 und dessen Anordnung im Abgasrohr ohne weitere Notwendigkeit einer Steuerung, Umleitung o.ä. des Abgasstromes ermöglicht wird. Ein weiterer erfindungsgemäßer Vorteil ist der erkenntlich geringere Energiebedarf der erfindungsgemäßen Vorrichtung, weil nur ein Teilstrom aufgeheizt werden muß. Die Erfindung ermöglicht die gezielte Entzündung der Partikel an einem bestimmten Bereich der Eintrittsfläche des aufgeheizten Abgases in den Filter und, hiervon ausgehend, das Freibrennen des gesamten Filters durch selbsttragende Verglimmung. Einfache Versuche ermöglichen zudem, in Abhängigkeit der vorgenannten Abgas- und Anlageparameter die Dimensionierung des Teilstromzuheizers 3 mit dem Ziel zu optimieren, den Energieverbrauch zur Initiierung des Abbrandes des Filters zu minimieren.Particularly advantageous in the method according to the invention or on the device according to the invention is the fact that the division of the exhaust gas flow into an additional partial flow to be heated and not an additional one partial flow to be heated by constructive training of the Partial flow heater 3 and its arrangement in the exhaust pipe without further need for control, rerouting, etc. of Exhaust gas flow is made possible. Another according to the invention The advantage is the noticeably lower energy requirement Device according to the invention, because only a partial flow is heated must become. The invention enables targeted Inflammation of the particles in a certain area of the Entry area of the heated exhaust gas into the filter and, starting from this, the burning of the entire filter through self-supporting annealing. Allow simple experiments in addition, depending on the aforementioned exhaust and System parameters the dimensioning of the partial flow heater 3 with the goal of optimizing energy consumption for initiation to minimize the burn-up of the filter.

    Claims (8)

    Verfahren zur Regeneration von beladenen Rußfiltern zur Filterung von Gasen und Abgasen, bei dem das (Ab)gas vor Durchtritt durch den Filter mit Heizmitteln aufgeheizt wird, dadurch gekennzeichnet, daß man mittels des Heizmittels (3) mindestens einen Abgasteilstrom innerhalb des Abgasrohres (1), das dem Filter (2) das zu filternde Abgas (6) zuführt, ausbildet und zusätzlich derart erhitzt, daß der Teilstrom des Abgases (6) in den Filter (2) mit höherer Temperatur als der des anderen Teilstroms eintritt.Process for the regeneration of loaded soot filters for filtering gases and exhaust gases, in which the (exhaust) gas is heated with heating means before it passes through the filter, characterized in that at least one partial exhaust gas flow within the exhaust pipe (1) is heated by means of the heating means (3). which supplies the filter (2) with the exhaust gas (6) to be filtered, forms it and additionally heats it in such a way that the partial flow of the exhaust gas (6) enters the filter (2) at a higher temperature than that of the other partial flow. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man den Abgasteilstrom höherer Temperatur auf eine solche Temperatur erhitzt, die eine sich im Rußfilter (2) ausbreitende Glimmverbrennung der Beladung des Rußfilters (2) initiiert.A method according to claim 1, characterized in that the exhaust gas partial flow of higher temperature is heated to a temperature which initiates a glow combustion of the loading of the soot filter (2) which spreads out in the soot filter (2). Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß man innerhalb des Abgasrohres (1) Kanäle zum freien Druchtritt des Abgases (6) und Kanäle zum Durchtritt unter zusätzlichem Erhitzen des Abgases ausbildet.A method according to claim 2, characterized in that channels for free passage of the exhaust gas (6) and channels for passage with additional heating of the exhaust gas are formed within the exhaust pipe (1). Vorrichtung zur Regeneration von beladenen Rußfiltern mit Heizmitteln zum Aufheizen des Abgases vor Durchtritt durch den Filter, dadurch gekennzeichnet, daß in dem Abgasrohr (1), das dem Filter (2) das zu filternde Abgas (6) zuführt, Heizmittel (3) vorgesehen sind, die zum einen den Abgasstrom (6) in mindestens zwei Teilströme unterteilen, und zum anderen mindestens einen der Teilströme des Abgases (6) vor Eintritt in den Filter (2) zusätzlich erhitzen, während der andere Teilstrom das Abgasrohr (1) zum Filter (2) ohne zusätzliche Erhitzung durchströmt. Device for the regeneration of loaded soot filters with heating means for heating the exhaust gas before it passes through the filter, characterized in that heating means (3) are provided in the exhaust pipe (1) which supplies the exhaust gas (6) to be filtered to the filter (2) , which on the one hand divide the exhaust gas flow (6) into at least two partial flows, and on the other hand additionally heat at least one of the partial flows of the exhaust gas (6) before entering the filter (2), while the other partial flow heats the exhaust pipe (1) to the filter ( 2) flows through without additional heating. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß das Heizmittel (3) aus leitfähiger Keramik, insbesondere aus leitfähiger Keramik mit PCT-Charakteristika hergestellt ist.Device according to claim 4, characterized in that the heating means (3) is made of conductive ceramic, in particular of conductive ceramic with PCT characteristics. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß das Heizmittel (3) ein Heizband (4) ist, durch das das Abgasrohr (1) unterteilt wird, wobei das Heizband (4) in einem Bereich des Abgasrohres (1) unter Ausbildung von sich in Strömungsrichtung erstreckenden spaltenförmigen Kanäle angeordnet ist, während der andere Bereich des Abgasrohres (1) für ungehinderten Durchtritt des Abgases (6) verbleibt.Apparatus according to claim 5, characterized in that the heating means (3) is a heating tape (4) through which the exhaust pipe (1) is divided, the heating tape (4) in a region of the exhaust pipe (1) forming itself in Column-shaped channels extending in the flow direction are arranged, while the other area of the exhaust pipe (1) remains for unhindered passage of the exhaust gas (6). Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß anstatt des Heizbandes (4) ein wabenförmiges Heizelement (5) vorgesehen ist, das ringförmig dem Abgasrohr innen und in unmittelbarer Nachbarschaft zur Eintrittsfläche des Filters (2) anliegt, und wobei eine Vielzahl von sich in Strömungsrichtung erstreckenden Kanäle zum Durchtritt eines ringförmigen Abgasteilstromes gebildet wird.Apparatus according to claim 6, characterized in that instead of the heating tape (4) there is provided a honeycomb-shaped heating element (5) which rests in a ring shape on the inside of the exhaust pipe and in the immediate vicinity of the inlet surface of the filter (2), and a large number of them in the flow direction extending channels for passage of an annular partial exhaust gas stream is formed. Vorrichtung nach Anspruch 4 und/oder 5, dadurch gekennzeichnet, daß als Heizmittel ein wabenförmiger Teilstromheizer (4) im Filtergehäuse (1) in Abgasströmungsrichtung vor dem Partikelfilter (2) zentrisch angeordnet wird, der im wesentlichen quadratischen Querschnitt aufweist und den den Teilstromheizer (4) durchtretenden Abgasteilstrom auf etwa 650 Grad C erhitzt, wobei die Querschnittsfläche des Teilstromheizers (4) etwa ein Fünftel der Querschnittsfläche des rohrförmigen Filtergehäuses (1) ausmacht.Apparatus according to claim 4 and / or 5, characterized in that a honeycomb-shaped partial flow heater (4) is arranged centrally in the filter housing (1) in the exhaust gas flow direction in front of the particle filter (2), which has a substantially square cross-section and which the partial flow heater (4 ) passing partial exhaust flow heated to about 650 degrees C, the cross-sectional area of the partial flow heater (4) making up about a fifth of the cross-sectional area of the tubular filter housing (1).
    EP01120085A 2000-09-18 2001-08-21 Method and apparatus for regeneration of loaded soot filters Withdrawn EP1188907A3 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE10046452 2000-09-18
    DE2000146452 DE10046452A1 (en) 2000-09-18 2000-09-18 Method and device for the regeneration of loaded soot filters

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    EP1188907A2 true EP1188907A2 (en) 2002-03-20
    EP1188907A3 EP1188907A3 (en) 2004-01-21

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    Citations (10)

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