EP0471186A1 - Exhaust gas purifying device for a diesel engine - Google Patents

Exhaust gas purifying device for a diesel engine Download PDF

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Publication number
EP0471186A1
EP0471186A1 EP91111539A EP91111539A EP0471186A1 EP 0471186 A1 EP0471186 A1 EP 0471186A1 EP 91111539 A EP91111539 A EP 91111539A EP 91111539 A EP91111539 A EP 91111539A EP 0471186 A1 EP0471186 A1 EP 0471186A1
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EP
European Patent Office
Prior art keywords
exhaust gas
channels
buffer body
purification device
gas purification
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.)
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Application number
EP91111539A
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German (de)
French (fr)
Inventor
Horst Dr. Kalfa
Wilfried Dr. Schütz
Christian Dr. Streuber
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Didier Werke AG
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Didier Werke AG
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Publication of EP0471186A1 publication Critical patent/EP0471186A1/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
    • F01N3/08—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention relates to an exhaust gas cleaning device for a diesel engine, in which a soot particle filter is followed by a further unit for exhaust gas treatment, in particular a catalyst for NO x removal, and a heating device is provided for burning off deposits of the soot particle filter.
  • the further unit is a second filter that removes components contained in the exhaust gas that develop an unpleasant smell.
  • the soot particle filter burns, the other unit flows through against the flow device in normal operation.
  • the object of the invention is to propose an exhaust gas purification device of the type mentioned in the introduction, in which the further unit is protected from temperature peaks which occur when the soot of the particle filter burns off.
  • the above object is achieved in the exhaust gas purification device of the type mentioned at the outset in that a buffer body, in particular made of ceramic material, is arranged in the exhaust gas path between the soot particle filter and the aggregate and has a plurality of channels connecting the soot particle filter and the aggregate, which passages in the buffer body run in a grid, and that the free cross section of the channels based on the total cross section of the buffer body and the free surface of the channels are dimensioned as a heat exchanger surface so that part of the thermal energy occurring during the burning process is stored in the buffer body and after the burning process with the exhaust gas is dissipated.
  • a temperature of 700 C occurs in the soot particle filter.
  • the downstream, further unit could not withstand this temperature.
  • the buffer body absorbs part of the thermal energy from this temperature peak.
  • the temperature in the further unit only increases by an amount compared to the temperature in normal operation, which does not yet damage the unit.
  • the heat stored in the buffer is then also removed in normal operation. This also does not lead to damage to the further aggregate.
  • the end result is that the temperature peaks in the soot particle filter are smoothed by the buffer body in relation to the other aggregate. This smoothing is possible because the duration of the burning process is limited.
  • the hydraulic diameter of the channels is preferably between 5 mm and 20 mm, in particular 10 mm.
  • An exhaust gas cleaning device has a soot particle filter (1), which is followed by a buffer body (2) in the exhaust gas path (A).
  • the buffer body (2) is connected to a NO x catalyst (4) via a manifold (3). This is followed by an exhaust outlet (5).
  • a burner (6) for regenerating the soot particle filter (1) is connected upstream of the soot particle filter (1) in the exhaust gas path.
  • the buffer body (2) consists of a refractory, ceramic material.
  • the buffer body (2) can also consist of metal or a latent heat storage material. It has a large number of continuous channels (9) for the exhaust gas routing.
  • the channels (9) are arranged in a hexagon or triangle grid (cf. FIG. 2).
  • the channels (9) can also be arranged in a rectangular grid.
  • the hydraulic diameter (d) of the channels (9) is approximately 10 mm. It can be between 5 mm and 20 mm.
  • the grid spacing (e) is 2 d, but at least 1.5 d.
  • the length (L) of the buffer body (2) is, for example, 500 mm.
  • the free cross section of the buffer body (2) that is to say the total cross section of the channels (9), in the example is approximately 22% to 23% of the total cross section of the buffer body (2).
  • the total cross section of the buffer body (2) is 0.125 m 2.
  • the specific surface area that is to say the area of all the walls of the channels (9), is 90.7 m 2 per m 3 of the volume of the buffer body (2).
  • This heat transfer surface of the channels (9) can also be between 50 m 2 and 200 m 2 per m 3 of the buffer body (2).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

An additional unit (4) connected downstream of a particulate filter (1) in an exhaust gas purifying device for a diesel engine is to be protected from temperature peaks which occur during the burning off of the particulates in the particulate filter (1). For this purpose, a buffer element (2) consisting of a ceramic material with channels (9) is arranged between the particulate filter (1) and the unit (4). The free cross-section of the channels (9) in relation to the total cross-section of the buffer element (1) and the free surface area of the channels (9) are dimensioned so that part of the heat energy arising during the burn-off process is stored in the buffer element (2) and is carried away with the exhaust gas after the burn-off process. <IMAGE>

Description

Die Erfindung betrifft eine Abgasreinigungseinrichtung für einen Dieselmotor, bei der einem Rußpartikelfilter ein weiteres Aggregat zur Abgasbehandlung, insbesondere ein Katalysator zur NOx-Entfernung, nachgeschaltet ist und eine Heizeinrichtung zum Abbrennen von Ablagerungen des Rußpartikelfilters vorgesehen ist.The invention relates to an exhaust gas cleaning device for a diesel engine, in which a soot particle filter is followed by a further unit for exhaust gas treatment, in particular a catalyst for NO x removal, and a heating device is provided for burning off deposits of the soot particle filter.

Eine derartige Abgasreinigungseinrichtung ist in der DE 38 42 282 A1 beschrieben. Bei dieser ist das weitere Aggregat ein zweites Filter, das im Abgas enthaltene Komponenten, die einen unangenehmen Geruch entwickeln, entfernt. Beim Abbrennen des Rußpartikelfilters wird das weitere Aggregat entgegen der Strömungseinrichtung im Normalbetrieb durchströmt.Such an exhaust gas purification device is described in DE 38 42 282 A1. In this case, the further unit is a second filter that removes components contained in the exhaust gas that develop an unpleasant smell. When the soot particle filter burns, the other unit flows through against the flow device in normal operation.

Beim Abbrennen des in dem Rußpartikelfilter abgelagerten Rußes treten Temperaturspitzen auf. Diese können das weitere Aggregat schädigen, insbesondere wenn es sich um einen Katalysator zur NOx-Entfernung handelt.When the soot deposited in the soot particle filter burns off, temperature peaks occur. These can damage the other aggregate, especially if it is a catalyst for NO x removal.

In der DE 37 16 446 A1 ist ein Rußpartikelfilter beschrieben, das so beschichtet ist, daß die Zündtemperatur des Rußes herabgesetzt wird.DE 37 16 446 A1 describes a soot particle filter which is coated in such a way that the ignition temperature of the soot is reduced.

Aufgabe der Erfindung ist es, eine Abgasreinigungseinrichtung der eingangs genannten Art vorzuschlagen, bei der das weitere Aggregat vor Temperaturspitzen geschützt ist, die beim Abbrennen des Rußes des Partikelfilters auftreten.The object of the invention is to propose an exhaust gas purification device of the type mentioned in the introduction, in which the further unit is protected from temperature peaks which occur when the soot of the particle filter burns off.

Erfindungsgemäß ist obige Aufgabe bei der Abgasreinigungseinrichtung der eingangs genannten Art dadurch gelöst, daß im Abgasweg zwischen dem Rußpartikelfilter und dem Aggregat ein Pufferkörper, insbesondere aus keramischem Material, angeordnet ist, der eine Mehrzahl von das Rußpartikelfilter und das Aggregat verbindenden Kanälen aufweist, die im Pufferkörper in einem Raster verlaufen, und daß der freie Querschnitt der Kanäle bezogen auf den Gesamtquerschnitt des Pufferkörpers und die freie Oberfläche der Kanäle als Wärmetauscherfläche so bemessen sind, daß ein Teil der während des Abbrennens auftretenden Wärmeenergie im Pufferkörper gespeichert wird und nach dem Abbrennen mit dem Abgas abgeführt wird.According to the invention, the above object is achieved in the exhaust gas purification device of the type mentioned at the outset in that a buffer body, in particular made of ceramic material, is arranged in the exhaust gas path between the soot particle filter and the aggregate and has a plurality of channels connecting the soot particle filter and the aggregate, which passages in the buffer body run in a grid, and that the free cross section of the channels based on the total cross section of the buffer body and the free surface of the channels are dimensioned as a heat exchanger surface so that part of the thermal energy occurring during the burning process is stored in the buffer body and after the burning process with the exhaust gas is dissipated.

Während des vergleichsweise kurzen Abbrennens des Rußes des Rußpartikelfilters tritt im Rußpartikelfilter beispielsweise eine Temperatur vom 700 C auf. Dieser Temperatur hielte das nachgeschaltete, weitere Aggregat nicht stand. Der Pufferkörper nimmt jedoch einen Teil der Wärmeenergie dieser Temperaturspitze auf. Die Temperatur im weiteren Aggregat erhöht sich dadurch gegenüber der Temperatur im Normalbetrieb nur um einen Betrag, der noch zu keiner Schädigung des Aggregats führt. Anschließend wird im Normalbetrieb die im Puffer gespeicherte Wärme mitabgeführt. Dies führt ebenfalls nicht zu einer Schädigung des weiteren Aggregats. Im Endergebnis sind die im Rußpartikelfilter auftretenden Temperaturspitzen bezogen auf das weitere Aggregat durch den Pufferkörper geglättet. Diese Glättung ist möglich, da die Dauer des Abbrennvorganges begrenzt ist.During the comparatively short burning of the soot of the soot particle filter, for example, a temperature of 700 C occurs in the soot particle filter. The downstream, further unit could not withstand this temperature. However, the buffer body absorbs part of the thermal energy from this temperature peak. As a result, the temperature in the further unit only increases by an amount compared to the temperature in normal operation, which does not yet damage the unit. The heat stored in the buffer is then also removed in normal operation. This also does not lead to damage to the further aggregate. The end result is that the temperature peaks in the soot particle filter are smoothed by the buffer body in relation to the other aggregate. This smoothing is possible because the duration of the burning process is limited.

Es hat sich gezeigt, daß dann, wenn der Durchmesser der Kanäle sehr klein ist, die gewünschte Glättung der Temperaturspitze nicht zu erreichen ist, da in diesem Fall die Temperaturspitze lediglich zeitlich verschoben im weiteren Aggregat auftritt. Es hat sich auch gezeigt, daß Kanäle sehr großen Durchmessers ungeeignet sind, da in diesem Fall die Temperaturspitze zeitgleich im weiteren Aggregat auftritt. Vorzugsweise liegt der hydraulische Durchmesser der Kanäle zwischen 5 mm und 20 mm, insbesondere bei 10 mm.It has been shown that if the diameter of the channels is very small, the desired smoothing of the temperature peak cannot be achieved, since in this case the temperature peak only occurs in the further unit with a time shift. It has also been shown that channels of very large diameters are unsuitable, since in this case the temperature peak occurs simultaneously in the further unit. The hydraulic diameter of the channels is preferably between 5 mm and 20 mm, in particular 10 mm.

Weitere vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen und der folgenden Beschreibung. In der Zeichnung zeigen:

  • Figur 1 eine Abgasreinigungseinrichtung und
  • Figur 2 einen Teilschnitt längs der Linie 11-11 nach
  • Figur 1, dieser gegenüber vergrößert.
Further advantageous embodiments of the invention result from the subclaims and the following description. The drawing shows:
  • 1 shows an exhaust gas purification device and
  • Figure 2 shows a partial section along the line 11-11
  • Figure 1, enlarged compared to this.

Eine Abgasreinigungseinrichtung weist einen Rußpartikelfilter (1) auf, dem im Abgasweg (A) ein Pufferkörper (2) nachgeschaltet ist. Über einen Krümmer (3) ist der Pufferkörper (2) an einen NOx-Katalysator (4) angeschlossen. Diesem folgt ein Abgasauslaß (5).An exhaust gas cleaning device has a soot particle filter (1), which is followed by a buffer body (2) in the exhaust gas path (A). The buffer body (2) is connected to a NO x catalyst (4) via a manifold (3). This is followed by an exhaust outlet (5).

Dem Rußpartikelfilter (1) ist im Abgasweg ein Brenner (6) zur Regenerierung des Rußpartikelfilters (1) vorgeschaltet. In dessen Brennerkammer (7) mündet eine vom nicht näher dargestellten Dieselmotor kommende Abgasleitung (8).A burner (6) for regenerating the soot particle filter (1) is connected upstream of the soot particle filter (1) in the exhaust gas path. An exhaust pipe (8) coming from the diesel engine, not shown, opens into the burner chamber (7).

Der Pufferkörper (2) besteht aus einem feuerfesten, keramischen Material. Der Pufferkörper (2) kann auch aus Metall oder einem Latentwärme-Speichermaterial bestehen. Er weist eine Vielzahl von durchgehenden Kanälen (9) für die Abgasführung auf. Die Kanäle (9) sind im Ausführungsbeispiel in einem Sechseck- bzw. Dreieck-Raster angeordnet (vgl. Figur 2). Die Kanäle (9) können auch in einem Rechteckraster angeordnet sein. Der hydraulische Durchmesser (d) der Kanäle (9) beträgt etwa 10 mm. Er kann zwischen 5 mm und 20 mm liegen. Der Rasterabstand (e) beträgt 2 d, mindestens jedoch 1,5 d. Die Länge (L) des Pufferkörpers (2) beträgt beispielsweise 500 mm. Der freie Querschnitt des Pufferkörpers (2), also der Gesamtquerschnitt der Kanäle (9), beträgt im Beispielsfalle etwa 22% bis 23% des Gesamtquerschnitts des Pufferkörpers (2). Im Ausführungsbeispiel beträgt der Gesamtquerschnitt des Pufferkörpers (2) 0,125 m2. Die spezifische Oberfläche, also die Fläche aller Wandungen der Kanäle (9) beträgt 90,7 m2 je m3 des Volumens des Pufferkörpers (2). Diese wärmeübertragende Oberfläche der Kanäle (9) kann auch zwischen 50 m2 und 200 m2 je m3 des Pufferkörpers (2) liegen.The buffer body (2) consists of a refractory, ceramic material. The buffer body (2) can also consist of metal or a latent heat storage material. It has a large number of continuous channels (9) for the exhaust gas routing. In the exemplary embodiment, the channels (9) are arranged in a hexagon or triangle grid (cf. FIG. 2). The channels (9) can also be arranged in a rectangular grid. The hydraulic diameter (d) of the channels (9) is approximately 10 mm. It can be between 5 mm and 20 mm. The grid spacing (e) is 2 d, but at least 1.5 d. The length (L) of the buffer body (2) is, for example, 500 mm. The free cross section of the buffer body (2), that is to say the total cross section of the channels (9), in the example is approximately 22% to 23% of the total cross section of the buffer body (2). In the exemplary embodiment, the total cross section of the buffer body (2) is 0.125 m 2. The specific surface area, that is to say the area of all the walls of the channels (9), is 90.7 m 2 per m 3 of the volume of the buffer body (2). This heat transfer surface of the channels (9) can also be between 50 m 2 and 200 m 2 per m 3 of the buffer body (2).

Versuche haben ergeben, daß es besonders günstig ist, wenn die Strömungsgeschwindigkeit (W) des Abgases in den Kanälen (9) zur Länge (L) des Pufferkörpers (2) bzw. die Kanäle (9) in einem Verhältnis kleiner 10 (1/s) stehen, wobei diese Bedingung im Betriebszustand im jeweiligen Kanal vorliegen soll.Experiments have shown that it is particularly favorable if the flow velocity (W) of the exhaust gas in the channels (9) to the length (L) of the buffer body (2) or the channels (9) in a ratio less than 10 (1 / s ), whereby this condition should exist in the operating state in the respective channel.

Es wurde mit der beschriebenen Einrichtung ein Abgasstrom von 170 Nm3/h behandelt. Die Temperaturspitze während des Abbrennvorganges lag bei 700 C und dauerte 15 min. Die Temperatur im Normalbetrieb betrug 450 C. Der Normalbetrieb zwischen zwei Abbrennvorgängen dauerte 120 min. Es hat sich dabei gezeigt, daß am Katalysator (4) niemals eine Temperatur von 700 C auftritt, sondern die Temperatur am Katalysator (4) während des Abbrennvorganges und für eine gewisse Zeit danach nur wenig über 450 C liegt, so daß der Katalysator (4) nicht geschädigt wurde. Dies ist darauf zurückzuführen, daß der Pufferkörper (2) während des Abbrennvorganges einen Teil der dabei entwickelten Wärme aufnimmt und diese erst später wieder an das Abgas abgibt.An exhaust gas flow of 170 Nm 3 / h was treated with the device described. The temperature peak during the burning process was 700 C and lasted 15 minutes. The temperature in normal operation was 450 C. Normal operation between two burn-off processes took 120 minutes. It has been shown that a temperature of 700 C never occurs on the catalyst (4), but the temperature on the catalyst (4) during the burning process and for a certain time thereafter is only slightly above 450 C, so that the catalyst (4 ) was not damaged. This is due to the fact that the buffer body (2) absorbs part of the heat developed during the burning process and only releases it to the exhaust gas later.

Claims (10)

1. Abgasreinigungseinrichtung für einen Dieselmotor, bei der einem Rußpartikelfilter ein weiteres Aggregat zur Abgasbehandlung, insbeondere ein Katalysator zur NOx-Entfernung, nachgeschaltet ist und eine Heizeinrichtung zum Abbrennen von Ablagerungen des Rußpartikelfilters vorgesehen ist,
dadurch gekennzeichnet,
daß im Abgasweg (A) zwischen dem Rußpartikelfilter (1) und dem Aggregat (4) ein Pufferkörper (2), insbesondere aus keramischem Material, angeordnet ist, der eine Mehrzahl von das Rußpartikelfilter (1) und das Aggregat (4) verbindenden Kanälen (9) aufweist, die im Pufferkörper (2) in einem Raster verlaufen, und daß der freie Querschnitt der Kanäle (9) bezogen auf den Gesamtquerschnitt des Pufferkörpers (2) und die freie Oberfläche der Kanäle (9) als Wärmetauscherfläche so bemessen sind, daß ein Teil der während des Abbrennens auftretenden Wärmeenergie im Pufferkörper (2) gespeichert wird und nach dem Abbrennen mit dem Abgas abgeführt wird.1. exhaust gas cleaning device for a diesel engine, in which a soot particle filter is followed by a further unit for exhaust gas treatment, in particular a catalyst for NO x removal, and a heating device is provided for burning off deposits of the soot particle filter,
characterized,
that a buffer body (2), in particular made of ceramic material, is arranged in the exhaust gas path (A) between the soot particle filter (1) and the unit (4), which has a plurality of channels (1) connecting the soot particle filter (1) and the unit (4) 9) which run in a grid in the buffer body (2) and that the free cross section of the channels (9) based on the total cross section of the buffer body (2) and the free surface of the channels (9) are dimensioned as a heat exchanger surface so that a part of the thermal energy occurring during the burning is stored in the buffer body (2) and is discharged with the exhaust gas after the burning. 2. Abgasreinigungseinrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß der freie Querschnitt der Kanäle (9) etwa 10% bis 35%, insbesondere 22% bis 23% des Gesamtquerschnittes des Pufferkörpers (2) beträgt.2. Exhaust gas purification device according to claim 1,
characterized,
that the free cross section of the channels (9) is about 10% to 35%, in particular 22% to 23% of the total cross section of the buffer body (2). 3. Abgasreinigungseinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die freie, wärmeübertragende Oberfläche der Kanäle (9) etwa 50 bis 200 m2 je m3 des Pufferkörpers (2) beträgt.3. Exhaust gas purification device according to one of the preceding claims,
characterized,
that the free, heat-transferring surface of the channels (9) is approximately 50 to 200 m 2 per m 3 of the buffer body (2). 4. Abgasreinigungseinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß das Verhältnis der Strömungsgeschwindigkeit (W) zur Länge (L) der Kanäle (9) kleiner als 10 (1/s) ist.4. Exhaust gas purification device according to one of the preceding claims,
characterized,
that the ratio of the flow velocity (W) to the length (L) of the channels (9) is less than 10 (1 / s). 5. Abgasreinigungseinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Kanäle (9) einen hydraulischen Durchmesser d aufweisen und der Rasterabstand der Kanäle (9) mindestens 1.5 d beträgt.5. Exhaust gas purification device according to one of the preceding claims,
characterized,
that the channels (9) have a hydraulic diameter d and the grid spacing of the channels (9) is at least 1.5 d. 6. Abgasreinigungseinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Kanäle (9) einen hydraulischen Durchmesser von etwa 5 mm bis 20 mm aufweisen.6. Exhaust gas purification device according to one of the preceding claims,
characterized,
that the channels (9) have a hydraulic diameter of about 5 mm to 20 mm. 7. Abgasreinigungseinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß die Kanäle (9) auf einem Secheck- bzw. gleichseitigen Dreieck- oder Rechteckraster angeordnet sind.7. Exhaust gas purification device according to one of the preceding claims,
characterized,
that the channels (9) are arranged on a hexagonal or equilateral triangular or rectangular grid. 8. Abgasreinigungseinrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet,
daß der Pufferkörper (2) aus einer Aluminiumoxid-Keramik oder einer Keramik auf Magnesiumoxid-Basis besteht.8. Exhaust gas purification device according to one of the preceding claims,
characterized,
that the buffer body (2) consists of an aluminum oxide ceramic or a ceramic based on magnesium oxide. 9. Abgasreinigungseinrichtung nach einem der vorhergehenden Ansprüche 1 bis 7,
dadurch gekennzeichnet,
daß der Pufferkörper (2) aus einem Metall besteht.9. Exhaust gas purification device according to one of the preceding claims 1 to 7,
characterized,
that the buffer body (2) consists of a metal. 10. Abgasreinigungseinrichtung nach einem der vorhergehenden Ansprüche 1 bis 7,
dadurch gekennzeichnet,
daß der Pufferkörper (2) aus einem Latentwärme-Speichermaterial besteht.10. Exhaust gas purification device according to one of the preceding claims 1 to 7,
characterized,
that the buffer body (2) consists of a latent heat storage material.
EP91111539A 1990-08-16 1991-07-11 Exhaust gas purifying device for a diesel engine Withdrawn EP0471186A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904025933 DE4025933A1 (en) 1990-08-16 1990-08-16 EXHAUST GAS PURIFICATION DEVICE FOR A DIESEL ENGINE
DE4025933 1990-08-16

Publications (1)

Publication Number Publication Date
EP0471186A1 true EP0471186A1 (en) 1992-02-19

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EP91111539A Withdrawn EP0471186A1 (en) 1990-08-16 1991-07-11 Exhaust gas purifying device for a diesel engine

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DE (1) DE4025933A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7716922B2 (en) 2006-10-20 2010-05-18 International Truck Intellectual Property Company, Llc Diesel particulate filter (DPF) in-chassis cleaning method
US10808589B2 (en) 2018-04-26 2020-10-20 Hyundai Motor Company Exhaust treatment system and method for treating engine exhaust

Citations (5)

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US3672160A (en) * 1971-05-20 1972-06-27 Dae Sik Kim System for producing substantially pollution-free hot gas under pressure for use in a prime mover
GB2063092A (en) * 1979-11-21 1981-06-03 Degussa Catalyst protected against overheating
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US7716922B2 (en) 2006-10-20 2010-05-18 International Truck Intellectual Property Company, Llc Diesel particulate filter (DPF) in-chassis cleaning method
US10808589B2 (en) 2018-04-26 2020-10-20 Hyundai Motor Company Exhaust treatment system and method for treating engine exhaust

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DE4025933C2 (en) 1992-05-27

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