DE19503989A1 - Exhaust gas cleaning device - Google Patents

Exhaust gas cleaning device

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Publication number
DE19503989A1
DE19503989A1 DE19503989A DE19503989A DE19503989A1 DE 19503989 A1 DE19503989 A1 DE 19503989A1 DE 19503989 A DE19503989 A DE 19503989A DE 19503989 A DE19503989 A DE 19503989A DE 19503989 A1 DE19503989 A1 DE 19503989A1
Authority
DE
Germany
Prior art keywords
exhaust gas
temperature
aftertreatment
heat exchanger
unit
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.)
Withdrawn
Application number
DE19503989A
Other languages
German (de)
Inventor
Axel Dr Koenig
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.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Priority to DE19503989A priority Critical patent/DE19503989A1/en
Publication of DE19503989A1 publication Critical patent/DE19503989A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/9454—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific device
    • 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
    • F01N3/0205—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using heat exchangers
    • 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
    • F01N3/08—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
    • F01N3/18—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 methods of operation; Control
    • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • 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
    • F01N3/18—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 methods of operation; Control
    • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • 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
    • F01N3/18—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 methods of operation; Control
    • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
    • 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
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • F01N3/2889—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices with heat exchangers 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
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

Unit to remove unwanted components in exhaust gas of a combustion engine contains an exhaust gas post treatment unit, which the exhaust gas passes through and which is first effective at elevated work temps., as well as a heating unit supplied with external energy connected to it. The unit is novel in that an exhaust gas/exhaust gas heat exchanger (3) is arranged in the exhaust gas flow before the post treatment and heating units (5,4). The heat exchanger is fed with the exhaust gas returned from the outlet of the post treatment unit (5).

Description

Die Erfindung betrifft eine Einrichtung gemäß dem Oberbegriff des Patentanspruchs 1. Wie auch aus den Unteransprüchen folgt, kann es sich bei der angesprochenen Abgasnachbehandlungsvor­ richtung um einen katalytischen Reaktor handeln, der erst ober­ halb seiner Anspringtemperatur voll wirksam ist, oder - insbe­ sondere bei einer Dieselmaschine - um einen Rußfilter, der zum Abbrennen des angesammelten Rußes auf eine Abbrenntemperatur erhitzt werden muß.The invention relates to a device according to the preamble of claim 1. As also follows from the subclaims, the exhaust gas aftertreatment mentioned can occur direction to act as a catalytic reactor, the top half its light-off temperature is fully effective, or - in particular especially in a diesel engine - around a soot filter that is used for Burning off the accumulated soot to a burning temperature must be heated.

Gemeinsam ist diesen beiden Nachbehandlungsvorrichtungen, daß zumindest zeitweise Maßnahmen getroffen werden müssen, damit die definierte Arbeitstemperatur erreicht wird. Im Falle eines katalytischen Reaktors, der der Umsetzung von Kohlenmonoxid, Stickoxid und Kohlenwasserstoffen dient, ist zu diesem Zweck bekannt, ihm eine Heizvorrichtung, beispielsweise eine elek­ trische Heizvorrichtung oder aber einen Brenner, zuzuordnen, wodurch ein Bereich des Reaktors und/oder das ihm zuströmende Abgas unmittelbar erhitzt wird. In entsprechender Weise ist be­ kannt, einen Rußfilter beispielsweise durch Einsatz von elektri­ scher Energie zeitweise auf die Abbrenntemperatur zu bringen. Ein anderer Vorschlag läuft darauf hinaus, durch zeitweilige Än­ derung der Betriebsweise der die Abgase erzeugenden Brennkraft­ maschine für eine Temperaturerhöhung am Rußfilter über die Ab­ brenntemperatur zu sorgen. Während bei einem katalytischen Reak­ tor der Betrieb der Heizvorrichtung nur nach einem Kaltstart bzw. im Teillastbereich der Maschine erforderlich ist, erfordert jeder Abbrennvorgang bei einem Rußfilter infolge der relativ niedrigen Temperatur der Abgase von Dieselmaschinen einen Heiz­ vorgang durch Fremdenergiezufuhr. Insbesondere bei gattungs­ gemäßen Einrichtungen, die in Fahrzeugen Einsatz finden, muß die hierfür erforderliche Fremdenergie aber möglichst klein gehalten werden.Common to these two aftertreatment devices is that Measures have to be taken at least temporarily so that the defined working temperature is reached. in case of an catalytic reactor, the implementation of carbon monoxide, Nitric oxide and hydrocarbons are used for this purpose Known him a heater, such as an elek trical heater or a burner to assign, whereby an area of the reactor and / or the area flowing to it Exhaust gas is heated immediately. Similarly, be knows a soot filter, for example, by using electri to temporarily bring the energy to the burn-off temperature. Another suggestion boils down to temporary changes Change in the mode of operation of the internal combustion engine generating the exhaust gases machine for a temperature increase on the soot filter via the Ab to ensure burning temperature. While with a catalytic react Operation of the heating device only after a cold start or in the partial load range of the machine is required  every burning process with a soot filter due to the relative low temperature of the exhaust gases from diesel engines a heater operation by external energy supply. Especially with genus According to facilities used in vehicles, the the external energy required for this is kept as small as possible become.

Außer dem Einsatz von Heizvorrichtungen ist zur Überbrückung der Aufwärmzeit von katalytischen Reaktoren der Einsatz von ins­ besondere Zeolithe enthaltenden Adsorbern bekannt geworden, die während dieser Zeitspanne insbesondere Kohlenwasserstoffe speichern und diese an den nachgeschalteten katalytischen Reaktor dann abgeben, wenn dieser seine Anspringtemperatur und sie selber ihre Desorptionstemperatur erreicht haben. Wie bei­ spielsweise das SAE-Paper 930 739 belegt, können sich hier aber dadurch Schwierigkeiten ergeben, daß die Desorptionstemperatur des Adsorbers niedriger ist als die Anspringtemperatur des kata­ lytischen Reaktors, so daß dann der Adsorber die gespeicherten Kohlenwasserstoffe bereits abgibt, bevor der Reaktor voll wirk­ sam ist. Daher wird in der angeführten Schrift der Einsatz eines Abgas/Abgas-Wärmetauschers in der Abgasströmung vor dem Adsorber vorgeschlagen, der mit Abgas betrieben wird, das am Ausgang des Adsorbers abgegriffen und rückgeführt wird. Derartige Einrich­ tungen mit Adsorber und katalytischem Reaktor sind also tempe­ raturmäßig schwer zu beherrschen.In addition to the use of heating devices, the Warm-up time of catalytic reactors using ins special zeolites containing adsorbers have become known during this period, especially hydrocarbons save and this to the downstream catalytic Deliver the reactor when it has started and they have reached their desorption temperature themselves. As with the SAE paper 930 739, for example, can be found here difficulties arise in that the desorption temperature of the adsorber is lower than the light-off temperature of the kata lytic reactor, so that the adsorber then the stored Already releases hydrocarbons before the reactor is fully effective is sam. Therefore, the use of a Exhaust gas / exhaust gas heat exchanger in the exhaust gas flow upstream of the adsorber proposed, which is operated with exhaust gas, which at the exit of the Adsorbers is tapped and recycled. Such a facility Treatments with adsorbers and catalytic reactors are therefore temp raturally difficult to master.

Bekannt ist auch die Anordnung eines mit Maschinenabwärme ge­ speisten, einen Wärmetauscher enthaltenden Wärmespeichers, der bei niedrigen Abgastemperaturen mittels Ventilen in die Abgas­ strömung zwischen Brennkraftmaschine und katalytischem Reaktor eingeschaltet wird (DE-OS 39 18 596, F01N 3/20). Durch die Not­ wendigkeit eines Wärmespeichers erfordert die bekannte Einrich­ tung einen relativ großen Aufwand; darüber hinaus ist die Anord­ nung von Ventilen mit ihren beweglichen Teilen im Abgasstrang hinsichtlich der Lebensdauer nicht unkritisch. The arrangement of a ge with machine waste heat is also known fed, a heat exchanger containing heat storage, the at low exhaust gas temperatures by means of valves in the exhaust gas flow between the internal combustion engine and the catalytic reactor is switched on (DE-OS 39 18 596, F01N 3/20). Because of the need Maneuverability of a heat accumulator requires the well-known device a relatively large effort; beyond that is the arrangement Valve with their moving parts in the exhaust system not uncritical in terms of service life.  

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Einrichtung zu schaffen, die bei minimalem Aufwand an Fremd­ energie unter Verzicht auf aufwendige Wärmespeicher und tempe­ raturkritische Adsorber das schnelle Erreichen bzw. das sichere Einhalten der Betriebstemperatur der Nachbehandlungsvorrichtung sicherstellt.The invention has for its object a generic To create facility that with minimal effort from outside energy without elaborate heat storage and tempe Ratur critically critical adsorber that can be reached quickly or safely Maintaining the operating temperature of the aftertreatment device ensures.

Die erfindungsgemäße Lösung besteht in den kennzeichnenden Merk­ malen des Hauptanspruchs, vorteilhafte Ausbildungen beschreiben die Unteransprüche.The solution according to the invention consists in the characteristic note paint the main claim, describe advantageous training the subclaims.

Bei der Erfindung wird also die Wärmeenergie der die Nach­ behandlungsvorrichtung verlassenden Abgase vor ihrem Austritt ins Freie in dem Abgas/Abgas-Wärmetauscher zur Wärmung des der Nachbehandlungsvorrichtung zuzuführenden Abgases ausgenutzt, so daß die Heizvorrichtung lediglich zur Überbrückung der verblei­ benden Temperaturdifferenz bzw. des verbleibenden Wärmeenergie­ defizits ausgelegt zu sein braucht. Unter "ausgelegt" ist vor­ teilhaft auch eine auf die Überwindung dieses Defizits begrenzte Arbeitsweise der Heizvorrichtung zu verstehen.In the invention, the thermal energy is the after Exhaust gases leaving the treatment device before they exit to the outside in the exhaust gas / exhaust gas heat exchanger for heating the After-treatment device exhaust gas used, so that the heater only to bypass the lead temperature difference or the remaining thermal energy deficits need to be designed. Under "laid out" is before also partially limited to overcoming this deficit Understand how the heater works.

Dabei kann es sich, wie bekannt, um eine elektrische Heizvor­ richtung, einen Brenner oder eine Kraftstoffeinspritzung in Ver­ bindung mit einem Oxidationskatalysator handeln, der seinerseits einen Bestandteil der Nachbehandlungsvorrichtung darstellen kann. Heizvorrichtungen dieser Art sind dem Fachmann bekannt.As is known, this can be an electric heating device direction, a burner or a fuel injection in ver deal with an oxidation catalyst, which in turn constitute part of the aftertreatment device can. Heaters of this type are known to those skilled in the art.

Ein Ausführungsbeispiel der Erfindung wird im folgenden anhand der Zeichnung erläutert.An embodiment of the invention is described below the drawing explained.

Die in der Brennkraftmaschine 1 erzeugten Abgase gelangen durch die Abgasleitung 2 nach Passieren des Abgas/Abgas-Wärmetauschers 3 und der Heizvorrichtung 4 bekannten Aufbaus in diesem Ausfüh­ rungsbeispiel in einen katalytischen Reaktor 5, der aber auch durch ein Rußfilter (wenn die Maschine 1 eine Dieselmaschine ist) gebildet sein kann. The exhaust gases generated in the internal combustion engine 1 pass through the exhaust pipe 2 after passing through the exhaust gas / exhaust gas heat exchanger 3 and the heating device 4 of known construction in this exemplary embodiment, into a catalytic reactor 5 , but also through a soot filter (if the machine 1 is a diesel engine is) can be formed.

Der Wärmetauscher 3 erhält gleichsam als Betriebsmittel über die Rückführungsleitung 6 Abgas, das den Reaktor 5 passiert hat. Demgemäß nimmt das die Abgasleitung 2 durchströmende Abgas im Wärmetauscher 3 Wärme von dem rückgeführten Abgas auf, das da­ nach ins Freie geleitet wird.The heat exchanger 3 , as it were, receives exhaust gas that has passed through the reactor 5 via the return line 6 . Accordingly, the exhaust gas flowing through the exhaust pipe 2 in the heat exchanger 3 absorbs heat from the recirculated exhaust gas, which is then conducted outside.

Da sowohl in der Rückführungsleitung 6 als auch im Wärmetauscher 3 Verluste auftreten, wird das durch die Abgasleitung 2 strömen­ de Abgas dort nicht auf die im Reaktor 5 herrschende Temperatur aufgeheizt, sondern auf eine niedrigere Temperatur, die aber höher ist als die Temperatur des die Maschine 1 verlassenden Abgases. Zur Überbrückung der Temperaturdifferenz dient die Heizvorrichtung 4, die demgemäß relativ klein ausgelegt bzw. mit relativ wenig Fremdenergie (Kraftstoff, elektrischer Strom) betrieben werden kann, damit das in den Reaktor 5 gelangende Abgas die Arbeitstemperatur desselben hat.Since losses occur both in the return line 6 and in the heat exchanger 3 , the exhaust gas flowing through the exhaust line 2 is not heated there to the temperature prevailing in the reactor 5 , but to a lower temperature, which is, however, higher than the temperature of the machine 1 leaving exhaust gas. To bridge the temperature difference, the heating device 4 is used , which is accordingly designed to be relatively small or can be operated with relatively little external energy (fuel, electric current) so that the exhaust gas entering the reactor 5 has the same working temperature.

Zweckmäßigerweise wird die Heizvorrichtung in Abhängigkeit von der Temperatur des ihr zuströmenden Abgases gesteuert bzw. gere­ gelt, so daß in allen Betriebszuständen der Brennkraftmaschine 1 (Kaltstart, Teillastbetrieb) die für den Betrieb des Reaktors 5 erforderliche Temperatur sichergestellt ist.The heating device is expediently controlled or regulated depending on the temperature of the exhaust gas flowing into it, so that the temperature required for the operation of the reactor 5 is ensured in all operating states of the internal combustion engine 1 (cold start, part-load operation).

Mit der Erfindung ist demgemäß mit minimalem Aufwand, insbeson­ dere unter Vermeidung temperaturkritischer oder bewegter Ein­ richtungen, eine Möglichkeit zur wirksamen Reinigung von Abgasen bei weitgehender Unabhängigkeit von den jeweils vorliegenden Temperaturverhältnissen geschaffen.The invention is accordingly with minimal effort, in particular avoiding temperature-critical or moving on directions, a way to effectively clean exhaust gases with extensive independence from the respective Temperature conditions created.

Claims (4)

1. Einrichtung zur Beseitigung störender Bestandteile im Abgas einer Brennkraftmaschine, enthaltend eine erst bei einer erhöhten Arbeitstemperatur wirksame, vom Abgas durchströmte Abgasnachbehandlungsvorrichtung sowie eine dieser zugeord­ nete, mit Fremdenergie betriebene Heizvorrichtung, dadurch gekennzeichnet, daß in der Abgasströmung vor Nachbehandlungs- und Heizvorrichtung (5, 4) ein Abgas/Abgas-Wärmetauscher (3) angeordnet ist, der mit vom Ausgang der Nachbehandlungsvor­ richtung (5) rückgeführtem Abgas gespeist ist.1.Device for removing disruptive constituents in the exhaust gas of an internal combustion engine, comprising an exhaust gas aftertreatment device which is only effective at an elevated working temperature and through which the exhaust gas flows, and an associated heating device operated with external energy, characterized in that in the exhaust gas flow before the aftertreatment and heating device ( 5 , 4 ) an exhaust gas / exhaust gas heat exchanger ( 3 ) is arranged, which is fed with exhaust gas recirculated from the outlet of the aftertreatment device ( 5 ). 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Nachbehandlungsvorrichtung einen katalytischen Reaktor (5) enthält und die Arbeitstemperatur eine Temperatur oberhalb seiner Anspringtemperatur ist.2. Device according to claim 1, characterized in that the aftertreatment device contains a catalytic reactor ( 5 ) and the working temperature is a temperature above its light-off temperature. 3. Einrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Nachbehandlungsvorrichtung einen Rußfilter enthält und die Arbeitstemperatur seine Abbrenntemperatur ist.3. Device according to claim 1 or 2, characterized in that the aftertreatment device contains a soot filter and the working temperature is its burn-off temperature. 4. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Heizvorrichtung (4) zur Beseitigung des verbleibenden Wärmeenergiedefizits zur Sicherstellung der Arbeitstemperatur ausgelegt ist.4. Device according to one of the preceding claims, characterized in that the heating device ( 4 ) is designed to eliminate the remaining thermal energy deficit to ensure the working temperature.
DE19503989A 1994-02-12 1995-02-07 Exhaust gas cleaning device Withdrawn DE19503989A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19503989A DE19503989A1 (en) 1994-02-12 1995-02-07 Exhaust gas cleaning device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4404573 1994-02-12
DE19503989A DE19503989A1 (en) 1994-02-12 1995-02-07 Exhaust gas cleaning device

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2820341A1 (en) * 2001-02-06 2002-08-09 Bosch Gmbh Robert DEVICE FOR TREATMENT OF EXHAUST GASES FROM AN INTERNAL COMBUSTION ENGINE INCLUDING AN ACCUMULATOR CATALYST
WO2009059679A1 (en) * 2007-11-08 2009-05-14 Daimler Ag Internal combustion engine with exhaust gas system
EP2557288A1 (en) 2011-08-09 2013-02-13 Universität Stuttgart Device and method for purifying waste gas for combustion engines
WO2013075771A1 (en) * 2011-11-24 2013-05-30 Volkswagen Aktiengesellschaft Method and arrangement for operating an internal combustion engine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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WO2009059679A1 (en) * 2007-11-08 2009-05-14 Daimler Ag Internal combustion engine with exhaust gas system
EP2557288A1 (en) 2011-08-09 2013-02-13 Universität Stuttgart Device and method for purifying waste gas for combustion engines
DE102011109761A1 (en) 2011-08-09 2013-02-14 Universität Stuttgart - Institut für Chemische Verfahrenstechnik Process and device for exhaust gas purification with optional heat recovery for internal combustion engines
US8475754B2 (en) 2011-08-09 2013-07-02 Universitaet Stuttgart Institut fuer Chemische Apparatus and method for purifying exhaust gases for combustion engines
WO2013075771A1 (en) * 2011-11-24 2013-05-30 Volkswagen Aktiengesellschaft Method and arrangement for operating an internal combustion engine

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