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WO2010055239A1 - Combustion engine exhaust line - Google Patents

Combustion engine exhaust line Download PDF

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Publication number
WO2010055239A1
WO2010055239A1 PCT/FR2009/051954 FR2009051954W WO2010055239A1 WO 2010055239 A1 WO2010055239 A1 WO 2010055239A1 FR 2009051954 W FR2009051954 W FR 2009051954W WO 2010055239 A1 WO2010055239 A1 WO 2010055239A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipe
injector
exhaust
line
curvature
Prior art date
Application number
PCT/FR2009/051954
Other languages
French (fr)
Inventor
Ludovic Francois
Original Assignee
Renault S.A.S.
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 Renault S.A.S. filed Critical Renault S.A.S.
Publication of WO2010055239A1 publication Critical patent/WO2010055239A1/en

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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/11—Adding substances to exhaust gases the substance or part of the dosing system being cooled
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors

Definitions

  • the invention relates to a combustion engine exhaust line.
  • Internal combustion engine exhaust lines are generally provided with means for the depollution and filtering of exhaust gases passed through the exhaust pipe, in particular with a view to reducing emissions of particles and oxides of nitrogen, as well as carbon monoxide and hydrocarbons.
  • These methods of depollution and filtering usually include a catalytic converter and a particulate filter.
  • the particulate filter perm and recover the pollutant particles emitted by the combustion of the fresh gas mixture in the combustion chamber of the engine.
  • Such a line comprises, in the form of a catalytic converter, a regeneration injector disposed in the pipe and which projects a jet of reductant, generally fuel, in the form of sprayed droplets or steam.
  • a regeneration phase consists of injecting fuel into the exhaust line, which results in an exothermic oxidation phase in the catalytic converter.
  • the exhaust gas then leaves the catalytic converter with a high temperature and enters the particulate filter by burning the pollutant particles that fill the particulate filter.
  • the invention relates in particular to the case where this injector is installed, following architectural requirements of the line, on a bend of the exhaust pipe, substantially in the plane of curvature of the pipe at this point, on the line of greater radius of curvature of the pipe in this plane.
  • the injection nozzle or injector is then fitted to the duct, generally made of cast iron, over thicknesses of the wall of the bearing pipe, via an injector support, with its head disposed opposite an orifice arranged in the pipe for the passage of a jet of fuel.
  • this orifice is relatively large and, taking into account more thicknesses of the wall, it is formed in front of the nozzle head a recirculation zone in which are circulated the gases of exhaust following their direction of arrival upstream of the elbow.
  • This recirculation causes too high a temperature at the nozzle head and is therefore harmful for this injection nozzle in terms of service life.
  • the invention solves this technical problem with a particularly simple manufacturing means.
  • the invention proposes a combustion engine exhaust line comprising an exhaust pipe, in which exhaust gases circulate, a gear injector disposed on a bend of the pipe, substantially on the line of combustion. greater radius of curvature of the pipe in the plane of curvature of this bend, and exhaust gas treatment means downstream of said injector, line characterized in that said exhaust pipe has a recirculation arrangement of the gas exhaust, near said injector, substantially aligned with the flow direction of the gas upstream of said bend.
  • said recirculation arrangement is downstream of said injector.
  • said recirculation arrangement is a cavity in the wall of the pipe.
  • said cavity is a groove of semi-circular section.
  • Said groove may have a length of about 15mm and its section a radius of about 12mm.
  • said recirculation arrangement is arranged in an excess thickness of the wall of the pipe.
  • FIG. 1 is a partial sectional view of an exhaust line according to the invention.
  • a combustion engine exhaust line com- monly comprises a cast iron exhaust pipe 1, in which exhaust gases circulate, a gear reducer injector 2 disposed on a bend of the pipe, substantially on the line of greater radius of curvature of the pipe in the plane of curvature of this bend, and treatment means of exhaust gas not shown downstream of the injector.
  • This injector or injection nozzle 2 is mounted on the pipe 1 by means of a nozzle support 3 fixed to an excess thickness 1A of the bearing pipe.
  • the exhaust pipe 1 has an exhaust gas recirculation arrangement proximate and downstream of the injector, substantially aligned with the flow direction F of the gas upstream of the bend.
  • This recirculation arrangement is a cavity in the wall of the pipe, and more precisely a substantially rectilinear groove 4 of semicircular section, with a length of about 15 m and whose section has a radius of about 1 2m m.
  • This groove is arranged in the excess thickness 1 A of the wall of the pipe.
  • the exhaust gases arriving in the bend of the exhaust pipe 1 in the indicated direction F penetrate close to the injector 2 directly into the groove 4, where they recirculate and are slowed down, before heading into the zone directly faces the head of the injector at a lower speed or almost zero.
  • the gases arriving in the zone of the injector head are therefore at a very low speed and at a relatively low temperature, which makes it possible to avoid damage to this injector head.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention relates to a combustion engine exhaust line comprising an exhaust pipe (1) in which exhaust gases flow, an injector (2) of reducing agent arranged on an elbow of the pipe, substantially on the line of greatest radius of curvature of the pipe in the plane of curvature of this elbow, and means for treating the exhaust gases downstream of said injector. According to the invention, said exhaust pipe (1) has an exhaust gas recirculation arrangement in the vicinity of said injector (2), substantially aligned with the direction of flow (F) of the gases upstream of said elbow.

Description

LI GN E D'ECHAPPEM ENT DE MOTEU R A COM BUSTI ON RUSH OF COM BUSTI ON MOTION
L'invention concerne une ligne d'échappem ent de moteur à com bustion. Les lignes d'échappem ent de moteur à com bustion interne sont pourvues généralem ent de m oyens de dépollution et de filtrage des gaz d'échappement traversés par la conduite d'échappement, dans le but en particulier de réduire les ém issions de particules et d'oxydes d'azote, ainsi que le m onoxyde de carbone et les hydrocarbures im brûlés. Ces m oyens de dépollution et de filtrage com portent usuellement un pot catalytique et un filtre à particules. Le filtre à particules perm et de récupérer les particules polluantes ém ises par la com bustion du m élange de gaz frais dans la cham bre de com bustion du m oteur. Une telle ligne com porte en am ont du pot catalyseur un injecteur de régénération disposé dans la conduite et qui projette un jet de réducteur, en général du carburant, sous form e de gouttelettes pulvérisées ou de vapeur. Une phase de régénération consiste à injecter du carburant dans la ligne d'échappem ent, ce qui entraîne une phase d'oxydation exotherm ique dans le pot catalytique. Les gaz d'échappement sortent alors du pot catalytique avec une tem pérature élevée et entrent dans le filtre à particules en brûlant les particules polluantes qui rem plissent le filtre à particules.The invention relates to a combustion engine exhaust line. Internal combustion engine exhaust lines are generally provided with means for the depollution and filtering of exhaust gases passed through the exhaust pipe, in particular with a view to reducing emissions of particles and oxides of nitrogen, as well as carbon monoxide and hydrocarbons. These methods of depollution and filtering usually include a catalytic converter and a particulate filter. The particulate filter perm and recover the pollutant particles emitted by the combustion of the fresh gas mixture in the combustion chamber of the engine. Such a line comprises, in the form of a catalytic converter, a regeneration injector disposed in the pipe and which projects a jet of reductant, generally fuel, in the form of sprayed droplets or steam. A regeneration phase consists of injecting fuel into the exhaust line, which results in an exothermic oxidation phase in the catalytic converter. The exhaust gas then leaves the catalytic converter with a high temperature and enters the particulate filter by burning the pollutant particles that fill the particulate filter.
L'invention concerne en particulier le cas où cet injecteur est installé, suite à des im pératifs d'architecture de la ligne, sur un coude de la conduite d'échappem ent, sensiblement dans le plan de courbure de la conduite à cet endroit, sur la ligne de plus grand rayon de courbure de la conduite dans ce plan.The invention relates in particular to the case where this injector is installed, following architectural requirements of the line, on a bend of the exhaust pipe, substantially in the plane of curvature of the pipe at this point, on the line of greater radius of curvature of the pipe in this plane.
La buse d'injection ou injecteur est alors m ontée sur la conduite, en général en fonte, sur des surépaisseurs de la paroi de la conduite formant palier, par l'interm édiaire d'un support d'injecteur, avec sa tête disposée en face d'un orifice agencé dans la conduite pour le passage d'un jet de carburant.The injection nozzle or injector is then fitted to the duct, generally made of cast iron, over thicknesses of the wall of the bearing pipe, via an injector support, with its head disposed opposite an orifice arranged in the pipe for the passage of a jet of fuel.
Compte tenu d'impératifs de fonderie, la dimension de cet orifice est relativement grande et, compte tenu de plus des surépaisseurs de la paroi, il est formé en face de la tête de buse une zone de recirculation dans laquelle viennent circuler les gaz d'échappement suite à leur sens d'arrivée en amont du coude. Cette recirculation entraîne une température trop élevée au niveau de la tête de buse et est donc dommageable pour cette buse d'injection en terme de durée de vie.Given the requirements of the foundry, the size of this orifice is relatively large and, taking into account more thicknesses of the wall, it is formed in front of the nozzle head a recirculation zone in which are circulated the gases of exhaust following their direction of arrival upstream of the elbow. This recirculation causes too high a temperature at the nozzle head and is therefore harmful for this injection nozzle in terms of service life.
L'invention résout ce problème technique grâce à un moyen de fabrication particulièrement simple.The invention solves this technical problem with a particularly simple manufacturing means.
Pour ce faire, l'invention propose une ligne d'échappement de moteur à combustion comportant une conduite d'échappement, dans laquelle circulent des gaz d'échappement, un injecteur de réducteur disposé sur un coude de la conduite, sensiblement sur la ligne de plus grand rayon de courbure de la conduite dans le plan de courbure de ce coude, et des moyens de traitement des gaz d'échappement en aval dudit injecteur, ligne caractérisée en ce que ladite conduite d'échappement présente un agencement de recirculation des gaz d'échappement, à proximité dudit injecteur, sensiblement aligné avec le sens d'écoulement des gaz en amont dudit coude.To do this, the invention proposes a combustion engine exhaust line comprising an exhaust pipe, in which exhaust gases circulate, a gear injector disposed on a bend of the pipe, substantially on the line of combustion. greater radius of curvature of the pipe in the plane of curvature of this bend, and exhaust gas treatment means downstream of said injector, line characterized in that said exhaust pipe has a recirculation arrangement of the gas exhaust, near said injector, substantially aligned with the flow direction of the gas upstream of said bend.
Selon un mode de réalisation préféré, ledit agencement de recirculation est en aval dudit injecteur. De préférence, ledit agencement de recirculation est une cavité dans la paroi de la conduite.According to a preferred embodiment, said recirculation arrangement is downstream of said injector. Preferably, said recirculation arrangement is a cavity in the wall of the pipe.
Avantageusement, ladite cavité est une rainure de section demi circulaire.Advantageously, said cavity is a groove of semi-circular section.
Ladite rainure peut présenter une longueur d'environ 15mm et sa section un rayon d'environ 12mm. Avantageusement, ledit agencement de recirculation est agencé dans une surépaisseur de la paroi de la conduite.Said groove may have a length of about 15mm and its section a radius of about 12mm. Advantageously, said recirculation arrangement is arranged in an excess thickness of the wall of the pipe.
L'invention est décrite ci-après plus en détail à l'aide de figures ne représentant qu'un mode de réalisation préféré de l'invention. La figure est une vue en coupe partielle d'une ligne d'échappement conforme à l'invention.The invention is described below in more detail with the aid of figures representing only a preferred embodiment of the invention. The figure is a partial sectional view of an exhaust line according to the invention.
Une ligne d'échappem ent de m oteur à com bustion com porte classiquem ent une conduite d'échappem ent 1 , en fonte, dans laquelle circulent des gaz d'échappem ent, un injecteur de réducteur 2 disposé sur un coude de la conduite, sensiblement sur la ligne de plus grand rayon de courbure de la conduite dans le plan de courbure de ce coude, et des moyens de traitem ent des gaz d'échappem ent non représentés en aval de l'injecteur.A combustion engine exhaust line com- monly comprises a cast iron exhaust pipe 1, in which exhaust gases circulate, a gear reducer injector 2 disposed on a bend of the pipe, substantially on the line of greater radius of curvature of the pipe in the plane of curvature of this bend, and treatment means of exhaust gas not shown downstream of the injector.
Cet injecteur ou buse d'injection 2 est monté sur la conduite 1 par l'interm édiaire d'un support de buse 3 fixé sur une surépaisseur 1 A de la conduite formant palier.This injector or injection nozzle 2 is mounted on the pipe 1 by means of a nozzle support 3 fixed to an excess thickness 1A of the bearing pipe.
La conduite d'échappem ent 1 présente un agencement de recirculation des gaz d'échappem ent, à proxim ité et en aval de l'injecteur, sensiblem ent aligné avec le sens d'écoulement F des gaz en amont du coude.The exhaust pipe 1 has an exhaust gas recirculation arrangement proximate and downstream of the injector, substantially aligned with the flow direction F of the gas upstream of the bend.
Cet agencement de recirculation est une cavité dans la paroi de la conduite, et plus précisém ent une rainure 4 sensiblem ent rectiligne, de section dem i- circulaire, d'une longueur d'environ 15m m et dont la section présente un rayon d'environ 1 2m m . Cette rainure est agencée dans la surépaisseur 1 A de la paroi de la conduite.This recirculation arrangement is a cavity in the wall of the pipe, and more precisely a substantially rectilinear groove 4 of semicircular section, with a length of about 15 m and whose section has a radius of about 1 2m m. This groove is arranged in the excess thickness 1 A of the wall of the pipe.
Les gaz d'échappem ent arrivant dans le coude de la conduite d'échappement 1 selon la direction indiquée F, pénètrent à proxim ité de l'injecteur 2 directement dans la rainure 4, où ils recirculent et sont ralentis, avant de se diriger dans la zone directem ent face à la tête de l'injecteur à une vitesse plus faible voire quasi nulle. Lors de leur rotation dans la rainure 4, il y a échange therm ique des gaz avec la paroi en fonte de la rainure et donc diminution de leur température. Les gaz arrivant dans la zone de la tête d'injecteur sont donc à une vitesse très faible et à une température relativement basse, ce qui permet d'éviter un endommagement de cette tête d'injecteur. The exhaust gases arriving in the bend of the exhaust pipe 1 in the indicated direction F, penetrate close to the injector 2 directly into the groove 4, where they recirculate and are slowed down, before heading into the zone directly faces the head of the injector at a lower speed or almost zero. During their rotation in the groove 4, there is thermal exchange of gases with the cast iron wall of the groove and therefore decrease their temperature. The gases arriving in the zone of the injector head are therefore at a very low speed and at a relatively low temperature, which makes it possible to avoid damage to this injector head.

Claims

REVENDICATIONS
1. Ligne d'échappement de moteur à combustion comportant une conduite d'échappement (1), dans laquelle circulent des gaz d'échappement, un injecteur de réducteur (2) disposé sur un coude de la conduite, sensiblement sur la ligne de plus grand rayon de courbure de la conduite dans le plan de courbure de ce coude, et des moyens de traitement des gaz d'échappement en aval dudit injecteur, ligne caractérisée en ce que ladite conduite d'échappement (1) présente un agencement de recirculation des gaz d'échappement, à proximité dudit injecteur (2), sensiblement aligné avec le sens d'écoulement (F) des gaz en amont dudit coude.A combustion engine exhaust line having an exhaust pipe (1) in which exhaust gas flows, a gear reducer injector (2) disposed on a bend of the pipe, substantially on the line further a large radius of curvature of the pipe in the plane of curvature of this bend, and exhaust gas treatment means downstream of said injector, line characterized in that said exhaust pipe (1) has a recirculation arrangement of exhaust gas, close to said injector (2), substantially aligned with the direction of flow (F) of the gas upstream of said bend.
2. Ligne selon la revendication précédente, caractérisé en ce que ledit agencement de recirculation est en aval dudit injecteur (2).2. Line according to the preceding claim, characterized in that said recirculation arrangement is downstream of said injector (2).
3. Ligne selon l'une des revendications précédentes, caractérisé en ce que ledit agencement de recirculation est une cavité (4) dans la paroi de la conduite.3. Line according to one of the preceding claims, characterized in that said recirculation arrangement is a cavity (4) in the wall of the pipe.
4. Ligne selon la revendication précédente, caractérisé en ce que ladite cavité est une rainure (4) de section demi-circulaire.4. Line according to the preceding claim, characterized in that said cavity is a groove (4) of semicircular section.
5. Ligne selon la revendication précédente, caractérisé en ce que ladite rainure (4) présente une longueur d'environ 15mm et sa section un rayon d'environ 12mm.5. Line according to the preceding claim, characterized in that said groove (4) has a length of about 15mm and its section a radius of about 12mm.
6. Ligne selon l'une des revendications précédentes, caractérisé en ce que ledit agencement de recirculation est agencé dans une surépaisseur (1A) de la paroi de la conduite. 6. Line according to one of the preceding claims, characterized in that said recirculation arrangement is arranged in an extra thickness (1A) of the wall of the pipe.
PCT/FR2009/051954 2008-11-13 2009-10-14 Combustion engine exhaust line WO2010055239A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0857669A FR2938294B1 (en) 2008-11-13 2008-11-13 EXHAUST LINE OF COMBUSTION ENGINE
FR0857669 2008-11-13

Publications (1)

Publication Number Publication Date
WO2010055239A1 true WO2010055239A1 (en) 2010-05-20

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WO (1) WO2010055239A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9664081B2 (en) 2007-07-24 2017-05-30 Faurecia Emissions Control Technologies, Germany Gmbh Assembly and method for introducing a reducing agent into the exhaust pipe of an exhaust system of an internal combustion engine
US9726064B2 (en) 2015-04-30 2017-08-08 Faurecia Emissions Control Technologies, Usa, Llc Mixer for use in a vehicle exhaust system
US10787946B2 (en) 2018-09-19 2020-09-29 Faurecia Emissions Control Technologies, Usa, Llc Heated dosing mixer
US10933387B2 (en) 2016-10-21 2021-03-02 Faurecia Emissions Control Technologies, Usa, Llc Reducing agent mixer

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19919426C1 (en) * 1999-04-28 2000-03-30 Siemens Ag Valve mounting for dosing valve of IC engine exhaust gas catalyser
EP1138891A2 (en) * 2000-03-31 2001-10-04 Toyota Jidosha Kabushiki Kaisha Exhaust emission control system of internal combustion engine
DE102005061145A1 (en) * 2005-12-21 2007-06-28 Robert Bosch Gmbh Automotive exhaust pipe is shaped to maximize or minimize release of heat to adjacent reduction agent dosing valve upstream from catalytic converter
FR2897646A3 (en) * 2006-02-20 2007-08-24 Renault Sas Exhaust line component for internal combustion engine of motor vehicle, has deflector placed upstream of cavity and projecting from inner surface of component to deflect exhaust gas flow from end of fuel injector
DE202008001547U1 (en) * 2007-07-24 2008-04-10 Emcon Technologies Germany (Augsburg) Gmbh Assembly for introducing a reducing agent into the exhaust pipe of an exhaust system of an internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19919426C1 (en) * 1999-04-28 2000-03-30 Siemens Ag Valve mounting for dosing valve of IC engine exhaust gas catalyser
EP1138891A2 (en) * 2000-03-31 2001-10-04 Toyota Jidosha Kabushiki Kaisha Exhaust emission control system of internal combustion engine
DE102005061145A1 (en) * 2005-12-21 2007-06-28 Robert Bosch Gmbh Automotive exhaust pipe is shaped to maximize or minimize release of heat to adjacent reduction agent dosing valve upstream from catalytic converter
FR2897646A3 (en) * 2006-02-20 2007-08-24 Renault Sas Exhaust line component for internal combustion engine of motor vehicle, has deflector placed upstream of cavity and projecting from inner surface of component to deflect exhaust gas flow from end of fuel injector
DE202008001547U1 (en) * 2007-07-24 2008-04-10 Emcon Technologies Germany (Augsburg) Gmbh Assembly for introducing a reducing agent into the exhaust pipe of an exhaust system of an internal combustion engine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9664081B2 (en) 2007-07-24 2017-05-30 Faurecia Emissions Control Technologies, Germany Gmbh Assembly and method for introducing a reducing agent into the exhaust pipe of an exhaust system of an internal combustion engine
US9726064B2 (en) 2015-04-30 2017-08-08 Faurecia Emissions Control Technologies, Usa, Llc Mixer for use in a vehicle exhaust system
US10933387B2 (en) 2016-10-21 2021-03-02 Faurecia Emissions Control Technologies, Usa, Llc Reducing agent mixer
US10787946B2 (en) 2018-09-19 2020-09-29 Faurecia Emissions Control Technologies, Usa, Llc Heated dosing mixer

Also Published As

Publication number Publication date
FR2938294B1 (en) 2015-06-05
FR2938294A1 (en) 2010-05-14

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