DE2428964A1 - Reactor insert for exhaust gas detoxification - with conically tapering inlet end - Google Patents

Reactor insert for exhaust gas detoxification - with conically tapering inlet end

Info

Publication number
DE2428964A1
DE2428964A1 DE2428964A DE2428964A DE2428964A1 DE 2428964 A1 DE2428964 A1 DE 2428964A1 DE 2428964 A DE2428964 A DE 2428964A DE 2428964 A DE2428964 A DE 2428964A DE 2428964 A1 DE2428964 A1 DE 2428964A1
Authority
DE
Germany
Prior art keywords
insert
exhaust gas
flow
reactor
section
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.)
Pending
Application number
DE2428964A
Other languages
German (de)
Inventor
Ernst Dipl Ing Linder
Helmut Maurer
Guenter Dipl Ing Dr Woessner
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE2428964A priority Critical patent/DE2428964A1/en
Publication of DE2428964A1 publication Critical patent/DE2428964A1/en
Pending 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
    • 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
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (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 gas reactor esp. for i.c. engines; having a tubular housing for the reception of at least one pref. monolithic reactor insert through which the gases flow longitudinally and having a connecting pipe leading to the smaller cross section exhaust gas feed pipe., the reactor insert is longer in the axial zone than at the edge zones, so that in the region of greater flow energy a greater flw resistance is attained as a result of the corresp. increase of the length of insert flow path in the centre of the flow, and therefore a more uniform flow over the whole cross section of the reactor is obtainable. The arrangement gives a more efficient and uniform detoxification of the exhaust gases as well as a longer life of the reactor insert, since the centre zone is not burnt out prematurely.

Description

Anlage zur Patent- und Gebrauchsmusterhilfsanmeldung Abgasreaktor, insbesondere für Brennkraftmaschinen Die Erfindung betrifft einen Abgasreaktor, insbesondere für Brennkraftmashinen, mit einem rohrförmigen, mindestens einen ldngsdurchströmbaren, insbesondere monolithartigen,Reaktoreinsatz aufnehmenden Gehäuse und einem zu der im Querschnitt kleineren Abgaszuleitung führenden Verbindungsstutzen.Annex to the patent and utility model auxiliary application for exhaust gas reactor, in particular for internal combustion engines The invention relates to an exhaust gas reactor, especially for internal combustion engines, with a tubular, at least one longitudinally throughflow, in particular monolith-like, reactor insert receiving housing and one to the The cross-section of the connecting piece leading to the exhaust gas feed line is smaller.

Bei den meisten bekannten Abgasreaktoren erfolgt der Abgasschadstoffabbau infolge der ungleichen Anströmung des Reaktoreinsatzes ungleichmäRi. Einerseits wird dadurch der Katalysator in dem Abschnitt,der voll von der Abgasströmung getroffen wird, stärker abgenutzt als die anderen Abschnitte, andererseits wird das Abgas in diesen voll getroffenen Abschnitten weniger gut behandelt als in den anderen. Dies wirkt sich besonders bei dynamischem Motorbetrieb, z.B bei raschen Gaswechseln, nachteilig aus, insbesondere wenn der Abgasstrom in einem scharfen engen Strahl in etwa des Querschnitts der Abgas zu leitung auf den Einsatz trifft. Wegen der ungleichmäßigen Beanspruchung muß, obwohl große Abschnitte nahezu unverbraucht sind, der gesamte Einsatz ausgetausht werden. Eine optimale Nutzung des Kontaktmaterials liegt immer erst dann vor, werni die thermische Bedingungen Uber den gesamten Einsatz und bei jedem Betriebszustand konstant sind Bei einem bekannten Abgasreaktor ist der Reaktoreinsatz trennwandartig im Gehäuse entweder diagonal, trichterförmig oder zylindrisch mit gesperrter Stirnseite angeordnet. Die Gasaufteilung auf den Reaktorquersctlnitt ist zwar hierbei wesentlich verbessert, ist jedoch mt einem Energieverlust verbunden, weil die Gase mehrfach stark umgeleitet werden müssen. Dieser Energieverlust wirkt sich in erhöhtem Kraftstoffverbrauch aus, einem Nachteil, der in Zukunft an Bedeutung zunehmen wird.In most known exhaust gas reactors, the exhaust gas pollutants are broken down due to the uneven flow to the reactor insert unevenly. On the one hand thereby the catalytic converter is in the section that is fully hit by the exhaust gas flow is worn out more than the other sections, on the other hand, the exhaust gas treated less well in these fully hit sections than in the others. This is particularly important in dynamic engine operation, e.g. with rapid gas changes, detrimental, especially when the exhaust gas flow is in a sharp narrow jet approximately the cross section of the exhaust gas line meets the insert. Because of the uneven load, although large sections are almost unused, the entire stake will be exchanged. Optimal use of the contact material is always only available when the thermal conditions over the entire period of use and are constant in every operating state. In a known exhaust gas reactor, is The reactor insert is like a partition in the housing, either diagonal, funnel-shaped or arranged cylindrically with a blocked end face. The gas distribution on the reactor cross-section is significantly improved in this regard, but is associated with a loss of energy, because the gases have to be diverted strongly several times. This loss of energy works results in increased fuel consumption, a disadvantage that will become more important in the future will increase.

Der Erfindung liegt die Aufgabe zugrunde, einen Abgasreaktor der eingangs genannten Art zu entwickeln, bei dem ohne nachteilige Strömungsverluste eine gleichmäßige Durchströmung des ganzen Einsatzquerschnittes erreichbar ist.The invention is based on the object of providing an exhaust gas reactor of the initially introduced to develop mentioned type, in which without disadvantageous flow losses a uniform Flow through the entire cross-section of the insert is achievable.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Einsatz zur Längsachse hin länger ist als in den Randbereichen, so daß im Bereich der größeren Strömungsenergie durch entsprechende Vergrößerung der Einsatzdurchströmlänge in der Strömungsmitte ein größerer Strömungswiderstand und damit eine gleichmäßigere Durchströmung Uber dem ganzen Einsatzquerschnitt erreichbar ist.According to the invention, this object is achieved in that the insert towards the longitudinal axis is longer than in the edge areas, so that in the area of the larger Flow energy by correspondingly increasing the insert flow length in the flow center a greater flow resistance and thus a more uniform Through-flow can be achieved over the entire cross-section of the insert.

Drei Ausführungsbeispiele des Gegenstandes der Erfindung sind in der Zeichnung dargestellt und werden im folgenden näher beschrieben. Es zeigen: Fig. 1 einen Einsatz mit kegeliger Stirnseite, Fig. 2 und 3 Haupteinsätze mit vorgeordneten kleinen Nebeneinsätzen.Three embodiments of the subject invention are shown in FIG Drawing shown and are described in more detail below. They show: Fig. 1 an insert with a conical face, Fig. 2 and 3 main inserts with upstream small side jobs.

In einer Abgasleitung 1 einer nicht dargestellten Brennkraftmaschine ist in einem achsgleichen Reaktorgehäuse 2 ein Feaktoreinsatz 3 angeordnet. Dieser monolithartige in Längsrichtung durchströnte Reaktoreinsatz 3 ist auf der der Strömung entgegengeriehteten Stirnseite 4 kegelig ausgebildet. Aufgrund der kegeligen Ausbildung nimmt die Länge der vom Gas durchströmten Kapillare zur Mittelachse hin zu. Da der Querschnitt der Einzelkapillare im gesamten Reaktoreinsatz etwa gleich groß ist, ist entsprechend der Stromungswiderstand bei längeren Kapillaren größer als bei kleineren. Es nimmt also der Strömungswiderstand des Reaktoreinsatzes zur Mittelachse hin zu. Da jedoch die Strömungsgeschwindigkeit bzw. Strömungsenergie zur Mittelachse des-Auspuffrohres 1 hin größer wird, wird aufgrund der kegelförmigen Stirnfläche 4 bewirkt, daß eine gleichmäßige Durchströmung über dem ganzen Reaktoreinsatzquerschnitt 3 erreicht wird.In an exhaust pipe 1 of an internal combustion engine, not shown a reactor insert 3 is arranged in a reactor housing 2 on the same axis. This monolith-like reactor insert 3 through which flow passes in the longitudinal direction is on top of the flow opposite end face 4 is conical. Because of the tapered training the length of the capillary through which the gas flows increases towards the central axis. Since the The cross-section of the individual capillary is approximately the same in the entire reactor insert, accordingly, the flow resistance is greater for longer capillaries than for smaller. So it increases the flow resistance of the reactor insert to the central axis towards. Since, however, the flow velocity or flow energy to the central axis des exhaust pipe 1 becomes larger due to the conical face 4 causes a uniform flow over the entire reactor insert cross-section 3 is reached.

Dies hat den entscheidenden Vorteil, daß der Reaktor nicht zuerst in der Mitte durchbrennt, wo die höchste Strömungsenergie und damit der größte Gasdurchsatz vor Katalysatoreintritt ist, sondern in etwa gleichmäßig abgenutzt wird.This has the decisive advantage that the reactor does not come first blows in the middle, where the highest flow energy and thus is the largest gas throughput before the catalyst inlet, but roughly uniform is worn out.

Die Folge sind längere Lebensdauer und gleichmäßigere sowie bessere Abgasentgiftung.The result is a longer service life and more even and better ones Exhaust gas decontamination.

Während bei dem in Fig. 1 dargestellten Ausführungsbeispiel die Kapillare nicht unterbrochen sind, wird bei den in Figur 2 und 3 dargestellten Beispielen der zur Mittelachse hin zunehmende Widerstand durch vorgesetzte Einsatzteile (Nebeneinsätze) bewirkt, die in etwa eine Kegelform bilden.While in the embodiment shown in Fig. 1, the capillary are not interrupted in the examples shown in FIGS the increasing resistance towards the central axis due to insert parts placed in front (secondary inserts) causes that form approximately a cone shape.

Bei dem in Fig. 2 dargestellten Beispiel sind dem Haupt- q reaktorensatz 3 zwei Nebeneinsätze 5 vorgeordnet, die durch Distanzstücke 6 zwischen dem jeweils nachfolgenden Einsatz einen Spalt bilden. Durch den Spalt wird bewirkt, daß sich die Abgasmengen verwirbeln und gleichmäßiger auf der nachfolgenden mit den Kapillaröffnungen versehenen Fläche verteilen. Bei dem in Figur 3 dargestellten Ausführungsbeispiel ist lediglich der eine Einsatz 7 kegelig ausgebildet, um eine noch bessere Annäherung an eine Gesamtkegelform zu erreichen.In the example shown in FIG. 2, the main q reactor set 3 upstream of two side inserts 5, which are separated by spacers 6 between each subsequent use form a gap. The gap causes that the exhaust gas swirls and more evenly on the subsequent with the capillary openings distribute the provided area. In the embodiment shown in FIG only one insert 7 is conical in order to provide an even better approximation to achieve a total cone shape.

Claims (4)

Ansprüche Expectations Abgasreaktor, insbesondere für Brennkraftmaschinen, mit einem rohrförmigen, mindestens einen längsdurchströmbaren, insbesondere monolithartigen, Reaktoreinsatz aufnehmenden Gehäuse uiid einem zu der im Querschnitt kleineren Abgaszuleitung führenden Verbindungsstutzen, dadurch gekennzeichnet, daß der Reaktoreinsatz (3) zur Längsachse hin länger ist als in den Randbereichen, so daß im Bereich der größeren Strömungsenergie durch entsprecDende Vergrößerung der Ei:?sat zdurchstrbmlänge in der Strömungsmitte ein größerer Stömungswiderstand und damit eine gleichmäßigere Durchströmüng über dem ganzen Einsatzquerschnitt erreichbar ist.Exhaust gas reactor, especially for internal combustion engines, with a tubular, at least one through-flow, in particular monolith-like, reactor insert receiving housing uiid one leading to the exhaust gas feed line with a smaller cross section Connection piece, characterized in that the reactor insert (3) to the longitudinal axis is longer than in the edge areas, so that in the area of greater flow energy by correspondingly enlarging the egg: saturation flow length in the middle of the flow a greater flow resistance and thus a more even flow over can be reached across the entire cross-section of use. 2. Abgasreaktor nach Anspruch 1, dadurch gekennzeichnet, daß die der Strömung entgegengerichtete Einsatzstirnseite (4) kegelig ausgebildet ist.2. Exhaust gas reactor according to claim 1, characterized in that the Flow oppositely directed insert face (4) is conical. 3. Abgasreaktor nach Anspruch 1, dadurch gekennzeichnet, daß der Einsatz geradflächige Stirnseiten aufweist und daß mindestens einer Stirnseite kegelige und/oder im Querschnitt kleinere zylindrische Einsatzteile vor- und/oder nachgeordnet sind.3. exhaust gas reactor according to claim 1, characterized in that the insert has straight end faces and that at least one end face is conical and / or cylindrical insert parts with a smaller cross section upstream and / or downstream are. 4. Abgasreaktor nach Aspruch 3, dadurch gekennzeichnet, daß zwischen den Einsatzteilen (5) Distanzstücke (6) angeordnet sind, um eine bessere Druckaufteilung zu ermöglichen.4. exhaust gas reactor according to claim 3, characterized in that between the insert parts (5) spacers (6) are arranged in order to better distribute the pressure to enable.
DE2428964A 1974-06-15 1974-06-15 Reactor insert for exhaust gas detoxification - with conically tapering inlet end Pending DE2428964A1 (en)

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DE2428964A DE2428964A1 (en) 1974-06-15 1974-06-15 Reactor insert for exhaust gas detoxification - with conically tapering inlet end

Applications Claiming Priority (1)

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DE2428964A1 true DE2428964A1 (en) 1976-01-02

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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695431A1 (en) * 1992-09-04 1994-03-11 Renault Exhaust device for internal combustion engine.
WO1996036796A1 (en) * 1995-05-19 1996-11-21 Silentor A/S A silencer with incorporated catalyst
EP0818613A1 (en) * 1996-07-08 1998-01-14 Corning Incorporated Exhaust gas purifying system
EP1092846A2 (en) 1999-10-14 2001-04-18 Basf Aktiengesellschaft Hydrodynamically optimized catalytic body
US6332510B1 (en) 1996-09-30 2001-12-25 Silentor Holding A/S Gas flow silencer
EP1215374A1 (en) * 2000-12-14 2002-06-19 Detroit Diesel Corporation Emission control catalyst assembly for an engine of a motor vehicle
US6520286B1 (en) 1996-09-30 2003-02-18 Silentor Holding A/S Silencer and a method of operating a vehicle
WO2003031053A1 (en) * 2001-10-04 2003-04-17 Forschungszentrum Jülich GmbH Distribution structure for operating materials, method for the production thereof and its use
US6776689B2 (en) 2000-12-29 2004-08-17 Corning Incorporated Method and apparatus for forming a ceramic catalyst support
US6938339B2 (en) 2000-12-19 2005-09-06 Corning Incorporated Method and apparatus for forming an inlet and outlet face of a catalyst support
FR2867508A1 (en) * 2004-03-12 2005-09-16 Peugeot Citroen Automobiles Sa Particle filter for use in an internal combustion engine exhaust system comprises an assemblage of superposed bars within a metallic casing
FR2876145A1 (en) * 2004-10-05 2006-04-07 Renault Sas Exhaust gas pollution control device for internal combustion engine of motor vehicle, has porous monolith on which gas, discharged by engine, arrives, and having inlet side equipped with protrusion presenting hemi-spherical dome shape
EP1647682A1 (en) * 2004-10-16 2006-04-19 Robert Bosch Gmbh Exhaust treatment device and method to operate an exhaust treatment device
WO2006107206A2 (en) * 2005-04-06 2006-10-12 Stichting Voor De Technische Wetenschappen Inlet section for micro-reactor
WO2006110458A1 (en) 2005-04-08 2006-10-19 Velocys, Inc. Flow control through plural, parallel connecting channels to/from a manifold
WO2007028697A1 (en) * 2005-09-05 2007-03-15 Robert Bosch Gmbh Filter element having improved soot distribution
EP1829595A1 (en) * 2002-03-29 2007-09-05 Ibiden Co., Ltd. Ceramic filter and exhaust gas decontamination unit
US7422910B2 (en) 2003-10-27 2008-09-09 Velocys Manifold designs, and flow control in multichannel microchannel devices

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695431A1 (en) * 1992-09-04 1994-03-11 Renault Exhaust device for internal combustion engine.
EP0592258A1 (en) * 1992-09-04 1994-04-13 Société Anonyme dite: REGIE NATIONALE DES USINES RENAULT Exhaust device for internal combustion engines
WO1996036796A1 (en) * 1995-05-19 1996-11-21 Silentor A/S A silencer with incorporated catalyst
US5758497A (en) * 1995-05-19 1998-06-02 Silentor A/S Silencer
US6220021B1 (en) 1995-05-19 2001-04-24 Silentor Notox A/S Silencer with incorporated catalyst
EP0818613A1 (en) * 1996-07-08 1998-01-14 Corning Incorporated Exhaust gas purifying system
US6332510B1 (en) 1996-09-30 2001-12-25 Silentor Holding A/S Gas flow silencer
US6520286B1 (en) 1996-09-30 2003-02-18 Silentor Holding A/S Silencer and a method of operating a vehicle
EP1092846A2 (en) 1999-10-14 2001-04-18 Basf Aktiengesellschaft Hydrodynamically optimized catalytic body
EP1215374A1 (en) * 2000-12-14 2002-06-19 Detroit Diesel Corporation Emission control catalyst assembly for an engine of a motor vehicle
US6938339B2 (en) 2000-12-19 2005-09-06 Corning Incorporated Method and apparatus for forming an inlet and outlet face of a catalyst support
US6776689B2 (en) 2000-12-29 2004-08-17 Corning Incorporated Method and apparatus for forming a ceramic catalyst support
WO2003031053A1 (en) * 2001-10-04 2003-04-17 Forschungszentrum Jülich GmbH Distribution structure for operating materials, method for the production thereof and its use
EP1829595A1 (en) * 2002-03-29 2007-09-05 Ibiden Co., Ltd. Ceramic filter and exhaust gas decontamination unit
US7510588B2 (en) 2002-03-29 2009-03-31 Ibiden Co., Ltd. Ceramic filter and exhaust gas decontamination unit
EP1829596A1 (en) * 2002-03-29 2007-09-05 Ibiden Co., Ltd. Ceramic filter and exhaust gas decontamination unit
US7422910B2 (en) 2003-10-27 2008-09-09 Velocys Manifold designs, and flow control in multichannel microchannel devices
FR2867508A1 (en) * 2004-03-12 2005-09-16 Peugeot Citroen Automobiles Sa Particle filter for use in an internal combustion engine exhaust system comprises an assemblage of superposed bars within a metallic casing
FR2876145A1 (en) * 2004-10-05 2006-04-07 Renault Sas Exhaust gas pollution control device for internal combustion engine of motor vehicle, has porous monolith on which gas, discharged by engine, arrives, and having inlet side equipped with protrusion presenting hemi-spherical dome shape
EP1647682A1 (en) * 2004-10-16 2006-04-19 Robert Bosch Gmbh Exhaust treatment device and method to operate an exhaust treatment device
WO2006107206A3 (en) * 2005-04-06 2007-05-03 Stichting Tech Wetenschapp Inlet section for micro-reactor
WO2006107206A2 (en) * 2005-04-06 2006-10-12 Stichting Voor De Technische Wetenschappen Inlet section for micro-reactor
WO2006110458A1 (en) 2005-04-08 2006-10-19 Velocys, Inc. Flow control through plural, parallel connecting channels to/from a manifold
US7641865B2 (en) 2005-04-08 2010-01-05 Velocys Flow control through plural, parallel connecting channels to/from a manifold
CN101218019B (en) * 2005-04-08 2011-11-09 维罗西股份有限公司 Flow control through plural, parallel connecting channels to/from a manifold
EP2543433A1 (en) * 2005-04-08 2013-01-09 Velocys Inc. Flow control through plural, parallel connecting channels to/from a manifold
WO2007028697A1 (en) * 2005-09-05 2007-03-15 Robert Bosch Gmbh Filter element having improved soot distribution

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