DE3824954A1 - Exhaust emission control system of an internal combustion engine - Google Patents

Exhaust emission control system of an internal combustion engine

Info

Publication number
DE3824954A1
DE3824954A1 DE19883824954 DE3824954A DE3824954A1 DE 3824954 A1 DE3824954 A1 DE 3824954A1 DE 19883824954 DE19883824954 DE 19883824954 DE 3824954 A DE3824954 A DE 3824954A DE 3824954 A1 DE3824954 A1 DE 3824954A1
Authority
DE
Germany
Prior art keywords
internal combustion
combustion engine
heat
catalytic converter
catalyst
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Withdrawn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
DE19883824954
Other languages
German (de)
Inventor
Frank-Dietrich Fabian
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.)
Daimler Benz AG
Original Assignee
Daimler Benz 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 Daimler Benz AG filed Critical Daimler Benz AG
Priority to DE19883824954 priority Critical patent/DE3824954A1/en
Publication of DE3824954A1 publication Critical patent/DE3824954A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—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
    • 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
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

In an exhaust emission control system of an internal combustion engine with a catalytic converter, heat is extracted from the exhaust gases by means of a heat exchanger tube. In order to protect the catalytic converter against overheating, the vaporising zone of the uncontrolled heat exchanger tube in the exhaust gas flow is situated upstream of the catalytic converter and the catalytic converter housing.

Description

Die Erfindung bezieht sich auf eine Reinigungsanlage für die Abgase einer Brennkraftmaschine mit den im Oberbegriff des Patentanspruchs 1 angegebenen Merkmalen.The invention relates to a cleaning system for the exhaust gases of an internal combustion engine with the The preamble of claim 1 features specified.

Eine derartige Reinigungsanlage ist aus der DE-OS 22 43 428 bekannt. Bei dieser bekannten Reinigungsanlage durch­ strömen die heißen Abgase das Innere des Katalysators und seines Gehäuses, bevor ihnen durch das Wärmerohr Wärme entzogen wird. Damit besteht die Gefahr, daß die Abgase über das innere Gehäuse den Katalysator zu stark aufheizen und dadurch schädigen oder zerstören. Auch bedeutet die Verwendung eines geregelten Wärmerohres einen erheb­ lichen Aufwand an Platz und Gewicht sowie im Preis.Such a cleaning system is from DE-OS 22 43 428 known. In this known cleaning system the hot exhaust gases flow inside the catalytic converter and its casing before they heat through the heat pipe is withdrawn. So there is a risk that the exhaust gases overheat the catalytic converter via the inner housing and thereby damage or destroy. It also means Use of a regulated heat pipe increases space, weight and price.

Der Erfindung liegt die Aufgabe zugrunde, bei einer Reinigungsanlage der eingangs genannten Art den Katalysator mit höherer Sicherheit und geringerem Aufwand vor einer Überhitzung zu schützen. The invention has for its object in a Cleaning system of the type mentioned Catalyst with higher safety and less effort to protect against overheating.  

Die Aufgabe ist bei einer Reinigungsanlage der gattungs­ bildenden Art erfindungsgemäß durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.The task is in a cleaning system of the genus type according to the invention by the characterizing Features of claim 1 solved.

Bei der erfindungsgemäß ausgebildeten Reinigungsanlage ist sichergestellt, daß bei zu heißen Abgasen diese über das Wärmerohr gekühlt werden, bevor sie den Kata­ lysator unmittelbar oder über das Gehäuse auf eine unzu­ lässig hohe Temperatur aufheizen und damit schädigen oder zerstören können. Für die Wärmeabfuhr ist ein platz- und gewichtsparendes ungeregeltes Wärmerohr ausreichend.In the cleaning system designed according to the invention ensures that the exhaust gases are too hot to be cooled via the heat pipe before entering the kata lysator directly or through the housing to an unzu heat up casually high temperature and damage or can destroy. For heat dissipation there is a space and weight-saving unregulated heat pipe sufficient.

Bei der Ausbildung des Erfindungsgegenstandes nach dem Patentanspruch 2 ist durch die Verwendung mehrerer Wärme­ rohre, die jedes für sich kleiner gestaltet werden können, eine gleichmäßige Kühlung der Abgase möglich.In the formation of the subject matter of the Claim 2 is through the use of multiple heat tubes, each of which can be made smaller, even cooling of the exhaust gases possible.

Im Patentanspruch 3 ist ein günstiger Ort für die Kühlung der Kondensationszone des Wärmerohres angegeben, außerdem unterstützt die normalerweise gegenüber der Abgasleitung höhere Lage dieses Ortes den Kondensatrückfluß von der Kondensationszone zur Verdampfungszone und damit die Wärmeleitung im Wärmerohr.In claim 3 is a convenient place for cooling the condensation zone of the heat pipe, in addition usually supports the exhaust pipe higher location of this place the condensate reflux from the Condensation zone to the evaporation zone and thus the Heat conduction in the heat pipe.

Der Patentanspruch 4 zeigt eine erfindungsgemäße Anwendung bei einem nahe der Brennkraftmaschine gelegenen, damit schnell anspringenden, aber auch besonders durch heiße Abgase gefährdeten Vorkatalysator, während der ent­ fernter liegende Hauptkatalysator keines besonderen Überhitzungsschutzes bedarf.Claim 4 shows an application according to the invention at a near the engine, so quickly starting, but also particularly hot Exhaust gas-endangered pre-catalyst, during the ent main catalyst further away is not a special one Protection against overheating is required.

Im folgenden wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert.In the following the invention is based on one in the Drawing shown embodiment closer explained.

Die Abgase einer in Seitenansicht dargestellten Brenn­ kraftmaschine 1 werden in einem Abgaskrümmer 2 gesammelt und über eine kurze Abgasleitung 3 einem Vorkatalysator 4 zugeführt, von dem aus sie über eine weitere Abgasleitung 5 zu einem Hauptkatalysator 6 und von diesem aus über einen nicht dargestellten Schalldämpfer ins Freie strömen.The exhaust gases of an internal combustion engine 1 shown in a side view are collected in an exhaust manifold 2 and fed via a short exhaust pipe 3 to a pre-catalyst 4 , from which they pass through a further exhaust pipe 5 to a main catalytic converter 6 and from there via a silencer (not shown) into the open stream.

Die Abgasleitung 3 ist unmittelbar vor dem Vorkatalysator 4 aufgeweitet, so daß sich ein Wärmetauschergehäuse 7 bildet, das in das Gehäuse des Vorkatalysators 4 mit gleichem Durchmesser übergeht. Im Wärmetauschergehäuse 7 befinden sich die Verdampfungszonen 8 mehrerer in einem Bündel zusammengefaßter Wärmerohre 9, deren Kondensations­ zonen 10 in einem luftgekühlten Wärmetauscher 11 unter­ gebracht sind. Der Wärmetauscher 11 ist seitlich der Brennkraftmaschine 1 mit den Kühlluftdurchlässen etwa in dessen Längsrichtung befestigt, so daß von einem vor der Brennkraftmaschine 1 befindlichen Lüfter 12 geförderte, seitlich an der Brennkraftmaschine vorbeistreifende Kühlluft die Kühlluftdurchlässe gut durchströmen und eine große Wärmemenge von den Kondensationszonen 10 der Wärmerohre 9 aufnehmen kann, wobei Kühlrippen 13 an den Kondensationszonen 10 diese Wärmeaufnahme noch unter­ stützen. Der Wärmetransport innerhalb der Wärmerohre 9 wird dabei dadurch unterstützt, daß seine Kondensationszonen 10 innerhalb des Wärmetauschers 11 höher liegen als seine Verdampfungszonen 8 innerhalb des Wärmetauschergehäuses 7. Damit ist es möglich, oberhalb einer bestimmten Grenz­ temperatur, die von der Siedetemperatur des Wärmeträgers innerhalb der Wärmerohre abhängt, den Abgasen eine große Wärmemenge zu entziehen, bevor sie den Katalysator 4 oder dessen Gehäuse erreichen, so daß er wirkungsvoll vor einer Überhitzung geschützt ist.The exhaust pipe 3 is widened immediately upstream of the pre-catalyst 4 , so that a heat exchanger housing 7 is formed, which merges into the housing of the pre-catalyst 4 with the same diameter. In the heat exchanger housing 7 there are the evaporation zones 8 of several heat pipes 9 combined in a bundle, the condensation zones 10 of which are placed in an air-cooled heat exchanger 11 . The heat exchanger 11 is attached to the side of the internal combustion engine 1 with the cooling air passages approximately in the longitudinal direction thereof, so that cooling air conveyed by a fan 12 located in front of the internal combustion engine 1 and flowing past the internal combustion engine flows well through the cooling air passages and a large amount of heat from the condensation zones 10 of the heat pipes 9 can accommodate, cooling fins 13 at the condensation zones 10 still support this heat absorption. The heat transport within the heat pipes 9 is supported in that its condensation zones 10 within the heat exchanger 11 are higher than its evaporation zones 8 within the heat exchanger housing 7 . This makes it possible, above a certain limit temperature, which depends on the boiling point of the heat carrier within the heat pipes, to withdraw a large amount of heat from the exhaust gases before they reach the catalytic converter 4 or its housing, so that it is effectively protected against overheating.

Claims (4)

1. Reinigungsanlage für die Abgase einer Brennkraft­ maschine mit in einem Gehäuse angeordnetem Katalysator, mit einer Abgasleitung zwischen der Brennkraftmaschine und dem Katalysator und mit einem Wärmerohr, dessen Ver­ dampfungszone den dem Katalysator zugeführten Abgasen Wärme entzieht und diese über eine in einer Umgebung mit niedriger Temperatur liegende Kondensationszone ab­ gibt, dadurch gekennzeichnet, daß die Verdampfungszone (8) des Wärmerohres (9) in der Abgasleitung (Wärmetauschergehäuse (7 ) stromauf des Katalysatorgehäuses angeordnet ist und daß das Wärmerohr (9) ein ungeregeltes Wärmerohr ist.1. Cleaning system for the exhaust gases of an internal combustion engine with a catalyst arranged in a housing, with an exhaust gas line between the internal combustion engine and the catalyst and with a heat pipe, the evaporation zone of which removes heat from the exhaust gases supplied to the catalyst and via a low temperature environment horizontal condensation zone from, characterized in that the evaporation zone ( 8 ) of the heat pipe ( 9 ) in the exhaust pipe (heat exchanger housing ( 7 ) is arranged upstream of the catalyst housing and that the heat pipe ( 9 ) is an uncontrolled heat pipe. 2. Reinigungsanlage nach Anspruch 1 , dadurch gekennzeichnet, daß mehrere Wärmerohre (9) zu einem Bündel zusammengefaßt etwa parallel zueinander angeordnet sind. 2. Cleaning system according to claim 1, characterized in that a plurality of heat pipes ( 9 ) combined to form a bundle are arranged approximately parallel to one another. 3. Reinigungsanlage nach Anspruch 1 oder 2 , dadurch gekennzeichnet, daß die mit Kühlrippen (13) versehene Kondensationszone (10) des Wärmerohres seitlich der Brennkraftmaschine (1) ange­ ordnet und dem dortigen Luftstrom ausgesetzt ist.3. Cleaning system according to claim 1 or 2, characterized in that the condensation zone ( 10 ) provided with cooling fins ( 13 ) of the heat pipe to the side of the internal combustion engine ( 1 ) is arranged and is exposed to the air flow there. 4. Reinigungsanlage nach einem der Ansprüche 1 bis 3 , dadurch gekennzeichnet, daß der Katalysator (4) ein nahe der Brennkraftmaschine angeordneter Vorkatalysator ist, dem stromab ein Haupt­ katalysator (6) nachgeschaltet ist.4. Cleaning system according to one of claims 1 to 3, characterized in that the catalytic converter ( 4 ) is a pre-catalytic converter arranged near the internal combustion engine, downstream of which a main catalytic converter ( 6 ) is connected.
DE19883824954 1988-07-22 1988-07-22 Exhaust emission control system of an internal combustion engine Withdrawn DE3824954A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19883824954 DE3824954A1 (en) 1988-07-22 1988-07-22 Exhaust emission control system of an internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19883824954 DE3824954A1 (en) 1988-07-22 1988-07-22 Exhaust emission control system of an internal combustion engine

Publications (1)

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DE3824954A1 true DE3824954A1 (en) 1989-07-20

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DE19883824954 Withdrawn DE3824954A1 (en) 1988-07-22 1988-07-22 Exhaust emission control system of an internal combustion engine

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4132440A1 (en) * 1991-09-28 1993-05-27 Emitec Emissionstechnologie Exhaust catalyst heating system - has containers contg. solids for high and low temp. reaction with gas, esp. hydrogen@
DE19645550A1 (en) * 1996-11-05 1998-05-07 Degussa Emission control converter
DE19919426C1 (en) * 1999-04-28 2000-03-30 Siemens Ag Valve mounting for dosing valve of IC engine exhaust gas catalyser
AT3888U3 (en) * 1999-11-03 2002-06-25 Avl List Gmbh Internal combustion engine
DE10232763B4 (en) * 2001-07-23 2005-07-14 Avl List Gmbh Exhaust gas recirculation cooler
CN109083722A (en) * 2017-06-14 2018-12-25 天纳克（苏州）排放系统有限公司 Engine exhaust post-processes mixing arrangement and its after-treatment device and application

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1451881A1 (en) * 1963-09-07 1969-01-23 Daimler Benz Ag Device for the catalytic post-combustion of exhaust gases from an internal combustion engine, in particular in motor vehicles
JPS5460612A (en) * 1977-10-24 1979-05-16 Toyota Motor Corp Exhaust gas temperature controller
DE2946947A1 (en) * 1979-11-21 1981-06-04 Degussa Ag, 6000 Frankfurt OVERHEATING PROTECTED CATALYST

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1451881A1 (en) * 1963-09-07 1969-01-23 Daimler Benz Ag Device for the catalytic post-combustion of exhaust gases from an internal combustion engine, in particular in motor vehicles
JPS5460612A (en) * 1977-10-24 1979-05-16 Toyota Motor Corp Exhaust gas temperature controller
DE2946947A1 (en) * 1979-11-21 1981-06-04 Degussa Ag, 6000 Frankfurt OVERHEATING PROTECTED CATALYST

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4132440A1 (en) * 1991-09-28 1993-05-27 Emitec Emissionstechnologie Exhaust catalyst heating system - has containers contg. solids for high and low temp. reaction with gas, esp. hydrogen@
DE19645550A1 (en) * 1996-11-05 1998-05-07 Degussa Emission control converter
DE19919426C1 (en) * 1999-04-28 2000-03-30 Siemens Ag Valve mounting for dosing valve of IC engine exhaust gas catalyser
US6513323B1 (en) 1999-04-28 2003-02-04 Siemens Aktiengesellschaft Valve seat device for a metering valve of an exhaust treatment station
AT3888U3 (en) * 1999-11-03 2002-06-25 Avl List Gmbh Internal combustion engine
DE10053591C2 (en) * 1999-11-03 2003-09-18 Avl List Gmbh Internal combustion engine
DE10232763B4 (en) * 2001-07-23 2005-07-14 Avl List Gmbh Exhaust gas recirculation cooler
CN109083722A (en) * 2017-06-14 2018-12-25 天纳克（苏州）排放系统有限公司 Engine exhaust post-processes mixing arrangement and its after-treatment device and application

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OAV Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1
OP8 Request for examination as to paragraph 44 patent law
8130 Withdrawal