EP0549851A1 - Soot filter for diesel engines - Google Patents

Soot filter for diesel engines Download PDF

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Publication number
EP0549851A1
EP0549851A1 EP92108822A EP92108822A EP0549851A1 EP 0549851 A1 EP0549851 A1 EP 0549851A1 EP 92108822 A EP92108822 A EP 92108822A EP 92108822 A EP92108822 A EP 92108822A EP 0549851 A1 EP0549851 A1 EP 0549851A1
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EP
European Patent Office
Prior art keywords
filter
candles
area
filter according
particulate filter
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
EP92108822A
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German (de)
French (fr)
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EP0549851B1 (en
Inventor
Friedrich Wilhelm Brinkmann
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ERNST-Apparatebau GmbH and Co
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ERNST-Apparatebau GmbH and Co
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Publication of EP0549851A1 publication Critical patent/EP0549851A1/en
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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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/0335—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with exhaust silencers in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/0212—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 with one or more perforated tubes surrounded by filtering material, e.g. filter candles
    • 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
    • F01N3/025—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 fuel burner or by adding fuel to exhaust
    • 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
    • F01N2240/20—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 flow director or deflector
    • 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
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/10—Residue burned
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/30—Exhaust treatment

Definitions

  • the invention relates to a soot filter for diesel engines with tubular filter cartridges, through the wall of which the exhaust gas passes from the inside to the outside and the soot is deposited on the outer tube wall, in order to be burned there by a burner after a layer has been formed.
  • soot filters With such soot filters, it has been shown that the soot layer deposited on the outside of the soot filter is not burned off uniformly by the burner. In particular, the soot layers deposited on the filter candles located further out are insufficiently burned off in the areas which are further away from the burner.
  • the object of the invention is to improve a soot filter of the type mentioned in such a way that the soot layers on the filter candles are burned off evenly and as completely as possible.
  • this object is achieved in that, at least in some, in particular the filter cartridges located further out, the flow resistance through the filter candle is greater in a first region closer to the burner or the flame entry than in a second region further away from the burner.
  • This change in the flow resistance of the filter cartridges causes the soot layers on the filter cartridges to burn off evenly, so that the soot filter is used optimally and the loading times can be extended, i.e. the time intervals between two burns can be chosen larger. It also significantly increases the life of the soot filter.
  • a particularly simple construction exists if a part narrowing the inner cavity is arranged between the two regions in the inner cavity of the filter candles.
  • the part can be a coaxial ring disk or a coaxial socket.
  • the bushing or the tube in the inner cavity of the filter candles or on the outside in the first area there is a bushing or a tube which extends over the length of the first area and has openings in the wall which increase the flow resistance.
  • the bushing or the tube can have a wall made of a mesh or of a sieve material.
  • Another alternative can be that the through-flow openings or the through-flow opening channels of the first area have a greater flow resistance than that of the second area.
  • the flow opening or the flow opening channels of the first area can have a smaller cross section than that of the second area.
  • the filter candles that lie further outside have a first region that is shorter in the longitudinal direction of the filter candles than the ones that lie further inside.
  • the first region extends over the entire length of the filter candles.
  • the part narrowing the inner cavity can be arranged at the end of the filter candle.
  • the soot filter has a housing 1 with a lateral tangentially arranged inlet 2 and a coaxially arranged outlet 3.
  • the inlet leads into an annular space 4 which surrounds a burner 5.
  • the flame gases emanating from the burner 5 are deflected by a guide plate 6 and guided into the filter space 7, in which a larger number of filter candles 8 extend parallel to one another and axially parallel to the housing 1.
  • the filter candles 8 are depth filters with ceramic windings 9 on perforated metal tubes 10.
  • the tubes 10 are closed on the end facing the burner and open with the opposite ends in a collecting space 11, which can be surrounded by a silencer 12 the outlet 3 leads.
  • the exhaust gases of the diesel engine pass through the inlet 2 into the annular space 4 and from there via the combustion chamber 4a into the filter space 7. They flow through the filter space 7 and penetrate the cylindrical walls 8a of the filter candles 8, in order to then flow through the interior of the filter candles 8 into the collecting space 11 and to the outlet 3.
  • the soot present in the exhaust gases settles in the ceramic windings 9 and on the outside as a layer, which is not shown in the drawing.
  • annular disk 14 or a bushing is coaxially fastened, which forms a flow resistance.
  • This ring disk 14 divides the filter candle 8 into a first area 15 and a second area 16, the flow resistance of the filter candle 8 being greater in the area 15 closer to the burner 5 than in the second area 16 facing away from the burner 5.
  • a tube can also be located in the inner cavity 8b of the area 15, which extends over the length of the first area and has openings in the wall in order to increase the flow resistance.
  • the tube can consist of a mesh or a screen surface.
  • such a tube can be arranged on the outside of tube 10 in the first region 15 between tube 10 and winding 9.
  • the throughflow openings or the throughflow channels of the first region 15 can have a smaller cross section than that of the second region 16.
  • the metal tubes 10 forming the filter interior cavity can be drawn in in particular in an annular manner at the location for forming the increased flow resistance.
  • the length of the first area 15 can be chosen very differently for the filter candles 8. It is particularly advantageous if the first area 15 in the filter candles 8 lying further outside is shorter than that in the candles lying further inside.
  • the first region 15 extends over its entire length, so that the annular disk 14 is fastened at the outlet of the filter cartridge 8. This also ensures that the flow resistance of all filter cartridges is approximately the same. It can be advantageous here that the annular disks 14 have openings of different sizes in order to achieve the desired flow resistance in the different filter cartridges 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Filtering Materials (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention relates to a soot filter for diesel engines having tubular filter cartridges (8), through the wall of which the exhaust gas passes from outside to inside and the soot deposits on the tube outer wall, in order there, after formation of a layer, to be burnt off by a burner (5), the resistance to flow through the filter cartridge, at least in some filter cartridges (8) situated further towards the outside, being greater in a first region (15) situated closer to the burner (5) or the flame inlet, than in a more remote second region (16). <IMAGE>

Description

Die Erfindung betrifft einen Rußfilter für Dieselmotoren mit rohrförmigen Filterkerzen, durch deren Wandung von außen nach innen das Abgas hindurchtritt und der Ruß sich an der Rohraußenwand ablagert, um dort nach Bildung einer Schicht durch einen Brenner abgebrannt zu werden.The invention relates to a soot filter for diesel engines with tubular filter cartridges, through the wall of which the exhaust gas passes from the inside to the outside and the soot is deposited on the outer tube wall, in order to be burned there by a burner after a layer has been formed.

Bei solchen Rußfiltern hat es sich gezeigt, daß die auf die Rußfilteraußenseite abgesetzte Rußschicht nicht gleichmäßig durch den Brenner abgebrannt wird. Insbesondere die auf den weiter außen liegenden Filterkerzen abgesetzten Rußschichten werden in den Bereichen, die vom Brenner weiter entfernt liegen ungenügend abgebrannt.With such soot filters, it has been shown that the soot layer deposited on the outside of the soot filter is not burned off uniformly by the burner. In particular, the soot layers deposited on the filter candles located further out are insufficiently burned off in the areas which are further away from the burner.

Aufgabe der Erfindung ist es, einen Rußfilter der eingangs genannten Art so zu verbessern, daß die auf den Filterkerzen befindlichen Rußschichten gleichmäßig und möglichst vollständig abgebrannt werden.The object of the invention is to improve a soot filter of the type mentioned in such a way that the soot layers on the filter candles are burned off evenly and as completely as possible.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß zumindest bei einigen, insbesondere den weiter außen liegenden Filterkerzen der Durchströmwiderstand durch die Filterkerze in einem, dem Brenner oder dem Flammeneintritt näher gelegenen ersten Bereich größer ist als in einem vom Brenner entfernter liegenden zweiten Bereich.According to the invention, this object is achieved in that, at least in some, in particular the filter cartridges located further out, the flow resistance through the filter candle is greater in a first region closer to the burner or the flame entry than in a second region further away from the burner.

Durch diese Veränderung der Durchströmwiderstände der Filterkerzen gelingt ein gleichmäßiger Abbrand der auf den Filterkerzen befindlichen Rußschichten, so daß der Rußfilter optimal genutzt wird und die Beladezeiten verlängert werden können, d.h. die zeitlichen Abstände zwischen zwei Abbränden können größer gewählt werden. Es erhöht sich damit auch die Lebensdauer des Rußfilters wesentlich.This change in the flow resistance of the filter cartridges causes the soot layers on the filter cartridges to burn off evenly, so that the soot filter is used optimally and the loading times can be extended, i.e. the time intervals between two burns can be chosen larger. It also significantly increases the life of the soot filter.

Eine konstruktiv besonders einfache Ausführung besteht dann, wenn in dem Innenhohlraum der Filterkerzen ein den Innenhohlraum verengendes Teil zwischen beiden Bereichen angeordnet ist. Hierbei kann das Teil eine koaxiale Ringscheibe oder eine koaxiale Buchse sein.A particularly simple construction exists if a part narrowing the inner cavity is arranged between the two regions in the inner cavity of the filter candles. The part can be a coaxial ring disk or a coaxial socket.

Alternativ wird vorgeschlagen, daß in dem Innenhohlraum der Filterkerzen oder an der Außenseite im ersten Bereich eine Buchse oder ein Rohr liegt, die bzw. das sich über die Länge des ersten Bereiches erstreckt und Öffnungen in der Wandung aufweist, die den Durchströmwiderstand erhöhen. Hierbei kann die Buchse oder das Rohr eine Wandung aus einem Geflecht oder aus einem Siebmaterial besitzen.Alternatively, it is proposed that in the inner cavity of the filter candles or on the outside in the first area there is a bushing or a tube which extends over the length of the first area and has openings in the wall which increase the flow resistance. Here, the bushing or the tube can have a wall made of a mesh or of a sieve material.

Eine weitere Alternative kann darin bestehen, daß die Durchströmöffnungen, bzw. die Durchströmöffnungskanäle des ersten Bereiches einen größeren Durchströmwiderstand aufweisen als die des zweiten Bereiches. Hierbei können die Durchströmöffnung, bzw. die Durchströmöffnungskanäle des ersten Bereiches einen kleineren Querschnitt aufweisen als die des zweiten Bereiches.Another alternative can be that the through-flow openings or the through-flow opening channels of the first area have a greater flow resistance than that of the second area. The flow opening or the flow opening channels of the first area can have a smaller cross section than that of the second area.

Bei allen Ausführungsbeispielen ist es besonders vorteilhaft, wenn die Filterkerzen, die weiter außen liegen, einen in Längsrichtung der Filterkerzen kürzeren ersten Bereich besitzen, als die weiter innen liegenden. Darüberhinaus wird bei allen Ausführungsbeispielen vorteilhafterweise vorgeschlagen, daß bei weiter innen, insbesondere im Zentrum angeordneten Filterkerzen der erste Bereich sich über die gesamte Länge der Filterkerzen erstreckt. Hierbei kann bei weiter innen, insbesondere im Zentrum liegenden Filterkerzen das den Innenhohlraum verengende Teil am Ende der Filterkerze angeordnet sein.In all of the exemplary embodiments, it is particularly advantageous if the filter candles that lie further outside have a first region that is shorter in the longitudinal direction of the filter candles than the ones that lie further inside. In addition, it is advantageously proposed in all exemplary embodiments that, in the case of filter candles arranged further inwards, in particular in the center, the first region extends over the entire length of the filter candles. In the case of filter candles located further inside, in particular in the center, the part narrowing the inner cavity can be arranged at the end of the filter candle.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung in einem koaxialen Längsschnitt dargestellt und wird im folgenden näher beschrieben:An embodiment of the invention is shown in the drawing in a coaxial longitudinal section and is described in more detail below:

Der Rußfilter weist ein Gehäuse 1 auf, mit einem seitlichen tangential angeordneten Einlaß 2 und einem koaxial angeordnetem Auslaß 3. Der Einlaß führt in einen Ringraum 4, der einen Brenner 5 umgibt. Die vom Brenner 5 ausgehenden Flammgase werden durch eine Leitplatte 6 umgelenkt und in den Filterraum 7 geführt, in dem sich eine größere Anzahl von Filterkerzen 8 parallel zueinander und Achsparallel zum Gehäuse 1 erstrecken.The soot filter has a housing 1 with a lateral tangentially arranged inlet 2 and a coaxially arranged outlet 3. The inlet leads into an annular space 4 which surrounds a burner 5. The flame gases emanating from the burner 5 are deflected by a guide plate 6 and guided into the filter space 7, in which a larger number of filter candles 8 extend parallel to one another and axially parallel to the housing 1.

Die Filterkerzen 8 sind im dargestellten Ausführungsbeispiel Tiefenfilter mit keramischen Wicklungen 9 auf gelochten Metallrohren 10. Die Rohre 10 sind auf dem, dem Brenner zugekehrtem Ende verschlossen und münden mit den gegenüberliegenden Enden in einem Sammelraum 11, der von einem Schalldämpfer 12 umgeben sein kann und zu dem Auslaß 3 führt.In the exemplary embodiment shown, the filter candles 8 are depth filters with ceramic windings 9 on perforated metal tubes 10. The tubes 10 are closed on the end facing the burner and open with the opposite ends in a collecting space 11, which can be surrounded by a silencer 12 the outlet 3 leads.

Die Abgase des Dieselmotors gelangen durch den Einlaß 2 in den Ringraum 4 und von dort über die Brennkammer 4a in den Filterraum 7. Sie durchströmen den Filterraum 7 und durchdringen die zylindrischen Wände 8a der Filterkerzen 8, um danach durch das Innere der Filterkerzen 8 hindurch in den Sammelraum 11 und zum Auslaß 3 zu strömen. Hierbei setzt sich der in den Abgasen befindliche Ruß in den keramischen Wicklungen 9 und an der Außenseite als eine Schicht ab, die in der Zeichnung nicht dargestellt ist.The exhaust gases of the diesel engine pass through the inlet 2 into the annular space 4 and from there via the combustion chamber 4a into the filter space 7. They flow through the filter space 7 and penetrate the cylindrical walls 8a of the filter candles 8, in order to then flow through the interior of the filter candles 8 into the collecting space 11 and to the outlet 3. Here, the soot present in the exhaust gases settles in the ceramic windings 9 and on the outside as a layer, which is not shown in the drawing.

Im Innenhohlraum 8b, zumindest bei weiter außen liegenden Filterkerzen 8, ist eine Ringscheibe 14 oder eine Buchse koaxial befestigt, die einen Durchströmwiderstand bildet. Diese Ringscheibe 14 teilt die Filterkerze 8 in einen ersten Bereich 15 und einen zweiten Bereich 16 auf, wobei in dem, dem Brenner 5 nähergelegenen Bereich 15 der Durchströmwiderstand der Filterkerze 8 größer ist als in dem zweiten, dem Brenner 5 abgewandten Bereich 16.In the inner cavity 8b, at least in the case of filter candles 8 lying further out, an annular disk 14 or a bushing is coaxially fastened, which forms a flow resistance. This ring disk 14 divides the filter candle 8 into a first area 15 and a second area 16, the flow resistance of the filter candle 8 being greater in the area 15 closer to the burner 5 than in the second area 16 facing away from the burner 5.

Hierdurch wird erreicht, daß die Flammgase weiter in den Filterraum 7 hineinreichen und damit auch die weiter hinten liegenden Rußschichten erreichen und abbrennen. Dieser vorteilhafte Effekt wird auf konstruktiv besonders einfache und die Filterkerzenwände optimal nutzende Weise durch Ringscheiben 14 erreicht. Im folgenden werden hierzu alternative Ausführungen beschrieben, die in der Zeichnung nicht dargestellt sind:This ensures that the flame gases reach further into the filter chamber 7 and thus also reach and burn off the soot layers lying further back. This advantageous effect is achieved in a structurally particularly simple manner and optimally using the filter candle walls by means of ring disks 14. Alternative designs are described below, which are not shown in the drawing:

Statt der Ringscheibe 14 kann auch ein Rohr im Innenhohlraum 8b des Bereiches 15 einliegen, das sich über die Länge des ersten Bereiches erstreckt und Öffnungen in der Wandung aufweist, um den Durchströmwiderstand zu erhöhen. Hierbei kann das Rohr aus einem Geflecht oder einer Siebfläche bestehen. In einer weiteren Alternative kann ein solches Rohr auf der Außenseite des Rohres 10 im ersten Bereich 15 zwischen Rohr 10 und Wicklung 9 angeordnet sein. Ferner ist es aber auch möglich, daß die Durchströmöffnungen, bzw. die Durchströmkanäle des ersten Bereiches 15 einen kleineren Querschnitt aufweisen als die des zweiten Bereiches 16.Instead of the washer 14, a tube can also be located in the inner cavity 8b of the area 15, which extends over the length of the first area and has openings in the wall in order to increase the flow resistance. The tube can consist of a mesh or a screen surface. In a further alternative, such a tube can be arranged on the outside of tube 10 in the first region 15 between tube 10 and winding 9. Furthermore, it is also possible for the throughflow openings or the throughflow channels of the first region 15 to have a smaller cross section than that of the second region 16.

In einer weiteren alternativen Ausführung können die den Filterinnenhohlraum bildenden Metallrohre 10 an der Stelle zum Bilden des erhöhten Durchströmwiderstandes nach innen insbesondere ringförmig eingezogen sein.In a further alternative embodiment, the metal tubes 10 forming the filter interior cavity can be drawn in in particular in an annular manner at the location for forming the increased flow resistance.

Die Länge des ersten Bereiches 15 kann sehr unterschiedlich bei den Filterkerzen 8 gewählt werden. Besonders vorteilhaft ist es, wenn bei den weiter außen liegenden Filterkerzen 8 der erste Bereich 15 kürzer ist als der bei den weiter innen liegenden Kerzen. Im Ausführungsbeispiel erstreckt sich bei der ersten koaxialen Filterkerze der erste Bereich 15 über ihre gesamte Länge, so daß die Ringscheibe 14 am Austritt der Filterkerze 8 befestigt ist. Hierdurch wird auch erreicht, daß der Durchströmwiderstand aller Filterkerzen etwa gleich ist. Von Vorteil kann hierbei sein, daß die Ringscheiben 14 unterschiedlich große Öffnungen besitzen, um den jeweils gewünschten Durchströmwiderstand bei den verschiedenen Filterkerzen 8 zu erreichen.The length of the first area 15 can be chosen very differently for the filter candles 8. It is particularly advantageous if the first area 15 in the filter candles 8 lying further outside is shorter than that in the candles lying further inside. In the exemplary embodiment, in the first coaxial filter cartridge, the first region 15 extends over its entire length, so that the annular disk 14 is fastened at the outlet of the filter cartridge 8. This also ensures that the flow resistance of all filter cartridges is approximately the same. It can be advantageous here that the annular disks 14 have openings of different sizes in order to achieve the desired flow resistance in the different filter cartridges 8.

Claims (11)

Rußfilter für Dieselmotoren mit rohrförmigen Filterkerzen (8), durch deren Wandung von außen nach innen das Abgas hindurchtritt und der Ruß sich an der Rohraußenwand ablagert, um dort nach Bildung einer Schicht durch einen Brenner (5) abgebrannt zu werden, dadurch gekennzeichnet, daß zumindest bei einigen, insbesondere den weiter außen liegenden Filterkerzen (8) der Durchströmwiderstand durch die Filterkerze in einem, dem Brenner (5) oder dem Flammeneintritt näher gelegenen ersten Bereich (15) größer ist als in einem entfernter liegenden zweiten Bereich (16).Soot filter for diesel engines with tubular filter cartridges (8), through the wall of which the exhaust gas passes from the inside to the outside and the soot is deposited on the pipe outer wall, in order to be burned there by a burner (5) after formation of a layer , characterized in that at least in the case of some filter candles (8) located further out, the flow resistance through the filter candle is greater in a first area (15) closer to the burner (5) or to the flame entry than in a second area (16) located further away. Rußfilter nach Anspruch 1, dadurch gekennzeichnet, daß in dem Innenhohlraum (8b) der Filterkerzen (8) ein den Innenhohlraum verengendes Teil (14) zwischen beiden Bereichen angeordnet ist.Particulate filter according to claim 1, characterized in that in the inner cavity (8b) of the filter candles (8) a part (14) narrowing the inner cavity is arranged between the two areas. Rußfilter nach Anspruch 2, dadurch gekennzeichnet, daß das Teil eine koaxiale Ringscheibe (14) oder eine koaxiale Buchse ist.Particulate filter according to claim 2, characterized in that the part is a coaxial ring disc (14) or a coaxial socket. Rußfilter nach Anspruch 1, dadurch gekennzeichnet, daß in dem Innenhohlraum (8b) der Filterkerzen (8) oder an der Außenseite im ersten Bereich eine Buchse oder ein Rohr liegt, die bzw. das sich über die Länge des ersten Bereiches erstreckt und Öffnungen in der Wandung aufweist, die den Durchströmwiderstand erhöhen.Particulate filter according to claim 1, characterized in that in the inner cavity (8b) of the filter candles (8) or on the outside in the first area there is a bushing or a tube which extends over the length of the first area and has openings in the Has wall that increase the flow resistance. Rußfilter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die den Filterinnenhohlraum bildenden Metallrohre (10) an der Stelle zum Bilden des erhöhten Durchströmwiderstandes nach innen insbesondere ringförmig eingezogen sind.Soot filter according to claim 1 or 2, characterized characterized in that the metal tubes (10) forming the filter interior cavity are retracted in particular in a ring shape at the point to form the increased flow resistance. Rußfilter nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Buchse oder das Rohr eine Wandung aus einem Geflecht oder aus einem Siebmaterial besitzen.Particulate filter according to claim 4 or 5, characterized in that the bushing or the tube has a wall made of a mesh or of a sieve material. Rußfilter nach Anspruch 1, dadurch gekennzeichnet, daß die Durchströmöffnungen, bzw. die Durchströmöffnungskanäle des ersten Bereiches (15) einen größeren Durchströmwiderstand aufweisen als die des zweiten Bereiches (16).Particulate filter according to claim 1, characterized in that the flow openings or the flow opening channels of the first region (15) have a greater flow resistance than that of the second region (16). Rußfilter nach Anspruch 7, dadurch gekennzeichnet, daß die Durchströmöffnung, bzw. die Durchströmöffnungskanäle des ersten Bereiches (15) einen kleineren Querschnitt aufweisen als die des zweiten Bereiches (16).Particulate filter according to claim 7, characterized in that the flow opening or the flow opening channels of the first area (15) have a smaller cross section than that of the second area (16). Rußfilter nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Filterkerzen (8), die weiter außen liegen, einen in Längsrichtung der Filterkerzen kürzeren ersten Bereich (15) besitzen, als die weiter innen liegenden.Particulate filter according to one of the preceding claims, characterized in that the filter candles (8) which lie further outside have a first region (15) which is shorter in the longitudinal direction of the filter candles than the ones lying further inside. Rußfilter nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß bei weiter innen, insbesondere im Zentrum angeordneten Filterkerzen (8) der erste Bereich (15) sich über die gesamte Länge der Filterkerzen erstreckt.Particulate filter according to one of the preceding claims, characterized in that in the case of filter candles (8) arranged further inwards, in particular in the center, the first region (15) extends over the entire length of the filter candles. Rußfilter nach Anspruch 9, dadurch gekennzeichnet, daß bei weiter innen, insbesondere im Zentrum liegenden Filterkerzen (8) das den Innenhohlraum (8b) verengende Teil am Ende der Filterkerze (8) angeordnet ist.Particulate filter according to claim 9, characterized in that when further inside, in particular in the center of the filter candles (8) the part narrowing the inner cavity (8b) is arranged at the end of the filter candle (8).
EP92108822A 1992-01-03 1992-05-26 Soot filter for diesel engines Expired - Lifetime EP0549851B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4200100A DE4200100A1 (en) 1992-01-03 1992-01-03 SOOT FILTER FOR DIESEL ENGINES
DE4200100 1992-01-03

Publications (2)

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EP0549851A1 true EP0549851A1 (en) 1993-07-07
EP0549851B1 EP0549851B1 (en) 1995-09-13

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EP92108822A Expired - Lifetime EP0549851B1 (en) 1992-01-03 1992-05-26 Soot filter for diesel engines

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US (1) US5279630A (en)
EP (1) EP0549851B1 (en)
JP (1) JP2513969B2 (en)
KR (1) KR930016639A (en)
AT (1) ATE127882T1 (en)
BR (1) BR9203807A (en)
CZ (1) CZ283739B6 (en)
DE (2) DE4200100A1 (en)
DK (1) DK0549851T3 (en)
ES (1) ES2077292T3 (en)
GR (1) GR3017443T3 (en)
HU (1) HUT66551A (en)
SK (1) SK360292A3 (en)

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US6003305A (en) 1997-09-02 1999-12-21 Thermatrix, Inc. Method of reducing internal combustion engine emissions, and system for same
US5989010A (en) 1997-09-02 1999-11-23 Thermatrix, Inc. Matrix bed for generating non-planar reaction wave fronts, and method thereof
SE0201566D0 (en) * 2002-05-27 2002-05-27 Karlshamns Ab New composition
DE10226108A1 (en) * 2002-06-12 2004-01-08 J. Eberspächer GmbH & Co. KG Exhaust system with particle filter for diesel engines
CN109322726A (en) * 2018-10-31 2019-02-12 扬州工业职业技术学院 Exhaust gas purification and noise elimination set composite

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Also Published As

Publication number Publication date
JPH0650129A (en) 1994-02-22
JP2513969B2 (en) 1996-07-10
BR9203807A (en) 1993-07-06
HUT66551A (en) 1994-12-28
CZ283739B6 (en) 1998-06-17
KR930016639A (en) 1993-08-26
ATE127882T1 (en) 1995-09-15
US5279630A (en) 1994-01-18
ES2077292T3 (en) 1995-11-16
DE4200100A1 (en) 1993-07-08
SK360292A3 (en) 1995-01-05
DE59203682D1 (en) 1995-10-19
EP0549851B1 (en) 1995-09-13
DK0549851T3 (en) 1996-02-05
HU9203046D0 (en) 1992-12-28
GR3017443T3 (en) 1995-12-31
CZ360292A3 (en) 1993-07-14

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