FR2925583A3 - Exhaust gas depolluting device for internal combustion engine, has heating unit with metallic element accumulating heat from exhaust gas and metallic conducting bar connected to element and reducing agent pulverization target - Google Patents

Exhaust gas depolluting device for internal combustion engine, has heating unit with metallic element accumulating heat from exhaust gas and metallic conducting bar connected to element and reducing agent pulverization target Download PDF

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Publication number
FR2925583A3
FR2925583A3 FR0760212A FR0760212A FR2925583A3 FR 2925583 A3 FR2925583 A3 FR 2925583A3 FR 0760212 A FR0760212 A FR 0760212A FR 0760212 A FR0760212 A FR 0760212A FR 2925583 A3 FR2925583 A3 FR 2925583A3
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France
Prior art keywords
exhaust gas
target
reducing agent
metallic
heat
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FR0760212A
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French (fr)
Inventor
Jean Marc Duclos
Christophe Piard
Xavier Descamps
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Renault SAS
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Renault SAS
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Priority to FR0760212A priority Critical patent/FR2925583A3/en
Publication of FR2925583A3 publication Critical patent/FR2925583A3/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
    • F01N3/08—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
    • F01N3/18—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 methods of operation; Control
    • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
    • 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
    • F01N3/36—Arrangements for supply of additional fuel
    • 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
    • F01N2240/02—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 heat exchanger
    • 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
    • F01N2240/10—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 heat accumulator
    • 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
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/10—Carbon or carbon oxides
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/12—Hydrocarbons
    • 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
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/102—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance after addition to exhaust gases, e.g. by a passively or actively heated surface in the exhaust conduit
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • 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

The device has an injection unit (3) injecting a reducing agent i.e. fuel, in the form of liquid in a duct (1) traversed by exhaust gas, and an oxidation unit (2) oxidizing hydrocarbon and carbon monoxide content in the exhaust gas. The unit (2) is arranged in downstream of the injection unit. A heating unit heats a reducing agent pulverization target (4), where the heating unit has a metallic element (10) accumulating heat from the exhaust gas and a metallic conducting bar (20) connected to the element (10) and the target. An independent claim is also included for a method for depolluting exhaust gas of an internal combustion engine.

Description

DISPOSITIF DE DEPOLLUTION DES GAZ D'ECHAPPEMENT D'UN MOTEUR A COMBUSTION INTERNE La présente invention concerne la dépollution des gaz d'échappement d'un moteur à combustion interne, et plus particulièrement les dispositifs de dépollution qui comportent : - un moyen d'injection d'un agent réducteur sous forme liquide dans un conduit traversé par les gaz d'échappement ; - un moyen d'oxydation des HC et CO contenu dans les gaz d'échappement, disposé en aval du moyen d'injection. The present invention relates to the depollution of the exhaust gases of an internal combustion engine, and more particularly to the depollution devices which comprise: an injection means a reducing agent in liquid form in a conduit traversed by the exhaust gas; a means of oxidation of HC and CO contained in the exhaust gas, disposed downstream of the injection means.

Dans certains modes de fonctionnement du moteur, les gaz d'échappement ne possèdent pas une température suffisante pour que la vaporisation de l'agent réducteur injecté à l'échappement s'effectue correctement. L'agent réducteur ainsi projeté, qui est préférentiellement du carburant, ne se vaporise pas toujours, peut ruisseler sur les parois de la ligne d'échappement et ne participe pas au réchauffement et/ou à l'augmentation de richesse des gaz d'échappement. Il est alors nécessaire d'injecter plus de carburant, ce qui augmente la consommation du moteur et provoque plus de carburant imbrûlé rejeté dans l'atmosphère. Pour pallier à cet inconvénient, les dispositifs comportent en plus - une cible de pulvérisation de l'agent réducteur ; - et des moyens de chauffage de la cible. Les moyens de chauffage connus comportent de manière générale une résistance permettant de chauffer électriquement la cible de pulvérisation. Un inconvénient de ce moyens de chauffage et qu'il faut un apport énergie électrique extérieur. L'invention vise à pallier les inconvénients ci-dessus, en fournissant un dispositif dans lequel les moyens de chauffage de la cible comportent : un premier élément accumulant la chaleur des gaz d'échappement qui sortent du moyen d'oxydation ; et un deuxième élément conducteur de chaleur et relié d'une part au premier élément et d'autre part à la cible. 2 L'invention fournit également un procédé de dépollution des gaz d'échappement consistant à traiter les HC CO des gaz d'échappement par oxydation, puis à prélever une partie de la chaleur des gaz d'échappement traité pour chauffer un agent réducteur introduit en amont du traitement des HC et CO des gaz d'échappement. Mais l'invention sera encore détaillée à l'aide de la description suivante et des dessins annexés, donnés à titre illustratif, et dans lesquels : la figure 1 montre de façon schématique un premier mode de réalisation d'un dispositif de dépollution selon l'invention ; la figure 2 montre de façon schématique un deuxième mode de réalisation d'un dispositif de dépollution selon l'invention ; la figure 3 montre de façon schématique un exemple du premier élément accumulant la chaleur des gaz d'échappement. Sur les figures et dans la description qui va suivre, les éléments identiques ou ayant la même fonction sont indiqués avec la même référence numérique. Le moteur à combustion interne comporte une ligne d'échappement traversée par les gaz d'échappement et qui comporte notamment le dispositif de dépollution. Le dispositif comporte, conformément aux figures 1 et 2, un conduit 1 traversé par les gaz d'échappement. Il comporte également un moyen d'oxydation 2 des HC et CO contenu dans les gaz d'échappement. II peut s'agir d'un catalyseur d'oxydation bien connu de l'homme du métier. Le catalyseur peut se trouver dans un boîtier prévu à cet effet et relié au conduit 1. In certain operating modes of the engine, the exhaust gases do not have a sufficient temperature for the vaporization of the reducing agent injected into the exhaust is carried out correctly. The reducing agent thus projected, which is preferably fuel, does not always vaporize, can run off the walls of the exhaust line and does not participate in the heating and / or increase of the exhaust gas richness . It is then necessary to inject more fuel, which increases the consumption of the engine and causes more unburned fuel released into the atmosphere. To overcome this drawback, the devices additionally comprise a target for spraying the reducing agent; and means for heating the target. The known heating means generally comprise a resistor for electrically heating the sputtering target. A disadvantage of this heating means and it requires a contribution external electrical energy. The invention aims to overcome the above drawbacks, by providing a device in which the means for heating the target comprise: a first element accumulating the heat of the exhaust gases leaving the oxidation means; and a second heat conductive element and connected firstly to the first element and secondly to the target. The invention also provides an exhaust gas depollution method of treating HC CO of the oxidation exhaust gas, and then removing a portion of the heat of the treated exhaust gas to heat a reducing agent introduced into the exhaust gas. upstream treatment of HC and CO exhaust. But the invention will be further detailed using the following description and accompanying drawings, given for illustrative purposes, and in which: Figure 1 shows schematically a first embodiment of a pollution control device according to the invention; FIG. 2 schematically shows a second embodiment of a depollution device according to the invention; Figure 3 shows schematically an example of the first element accumulating the heat of the exhaust gas. In the figures and in the description which follows, elements identical or having the same function are indicated with the same reference numeral. The internal combustion engine comprises an exhaust line traversed by the exhaust gas and which comprises in particular the depollution device. The device comprises, according to Figures 1 and 2, a conduit 1 through which the exhaust gas. It also comprises an oxidation means 2 of HC and CO contained in the exhaust gas. It may be an oxidation catalyst well known to those skilled in the art. The catalyst can be in a housing provided for this purpose and connected to the duct 1.

Le dispositif comporte un moyen d'injection 3 d'un agent réducteur sous forme liquide. Ce moyen, pouvant correspondre à un injecteur de carburant 3, injecte du carburant sous forme liquide dans le conduit 1 traversé par les gaz d'échappement. Le catalyseur d'oxydation 2 est disposé en aval de l'injecteur de carburant 3, pris par rapport au sens de circulation du flux de gaz d'échappement. L'injecteur 3 est placé pour injecter le carburant vers une cible de pulvérisation 4. Cette cible 4 peut être de formes diverses, elle peut par exemple consister en une plaque rapportée dans le conduit 1. La cible 4 possède des dimensions qui sont définies pour vaporiser un débit de carburant prédéfini à une température de cible prédéfinie. La cible 4 est également conçue de sorte que les pertes thermiques par conduction avec la ligne d'échappement, notamment le conduit 1, soit les plus petites possibles. La cible 4 est disposée entre le moyen d'injection 3 et le moyen d'oxydation 2. Le dispositif comporte des moyens de chauffage de la cible. Conformément à l'invention, ces moyens de chauffage comportent un premier 3 élément 10 accumulant la chaleur des gaz d'échappement qui sortent du moyen d'oxydation 2 et un deuxième élément 20 qui est conducteur de chaleur et qui est relié d'une part au premier élément 10 et d'autre part à la cible 4. Les matériaux utilisés pour les deux éléments sont par exemple des matériaux métalliques, tels que le l'aluminium ou encore le cuivre, car ils sont de bons conducteurs de chaleur. Le premier élément 10 est de préférence disposé dans le flux de gaz d'échappement sortant du catalyseur d'oxydation 2, et il est conçu de sorte à minimiser les perturbations du flux de gaz d'échappement. Le dispositif selon l'invention fait appel au procédé inventif qui consiste à traiter les HC CO des gaz d'échappement par une réaction d'oxydation, puis à prélever une partie de la chaleur des gaz d'échappement traité pour chauffer un agent réducteur introduit en amont du traitement des HC et CO des gaz d'échappement. Les HC et CO qui sont traités peuvent provenir du moteur ou encore de l'injecteur de carburant 3 dans le conduit 1. La particularité du catalyseur d'oxydation 2 est que la réaction d'oxydation des HC et CO qui s'y déroule est exothermique, ce qui rend les gaz d'échappement plus chaud en aval du catalyseur 2 qu'en amont. On peut ainsi utiliser cette chaleur pour réchauffer la cible de pulvérisation 4 et favoriser la vaporisation du carburant lorsque les conditions ne le permettent pas. La partie de chaleur des gaz d'échappement peut de préférence se faire par une perturbation du flux, la plus petite possible. Conformément à la figure 3, le premier élément 10 peut être constitué d'ailettes 11 disposées autour d'une pièce centrale 12. Les ailettes 11 augmentent la surface d'échange avec le flux de gaz d'échappement qui sortent du catalyseur d'oxydation 2, pour chauffer le premier élément 10 le plus rapidement possible à la température des gaz d'échappement. Le deuxième élément 20 peut être réalisé sous la forme d'une barre conductrice, de préférence métallique, et qui peut être recouvert d'une couche en matériau isolant thermiquement, afin de renvoyer la chaleur prélevée aux gaz d'échappement sans déperdition de chaleur vers la cible 4. La barre conductrice peut comporter la pièce centrale 12 autour de laquelle sont disposées les ailettes 11, cette partie n'étant alors pas recouverte de la couche en matériau isolant. L'extrémité opposée peut être reliée à la cible, ou encore constituer elle-même la cible. L'inertie thermique du deuxième élément 20 est de préférence inférieure à celle du conduit 1. Selon le mode de réalisation de la figure 1, le deuxième élément 20 des moyens de chauffage traverse le catalyseur d'oxydation 2. Le catalyseur d'oxydation 2 est réalisé de sorte qu'il définisse un orifice traversant pour le passage du deuxième élément 20. L'avantage est que le deuxième élément 20 peut ainsi avoir une inertie thermique la plus petite possible car il relie le premier élément 10 à la cible 4 par le chemin le plus court. The device comprises a means 3 for injecting a reducing agent in liquid form. This means, which may correspond to a fuel injector 3, injects fuel in liquid form into the conduit 1 through which the exhaust gas flows. The oxidation catalyst 2 is disposed downstream of the fuel injector 3, taken with respect to the direction of flow of the exhaust gas stream. The injector 3 is placed to inject the fuel towards a sputtering target 4. This target 4 may be of various shapes, it may for example consist of a plate attached in the conduit 1. The target 4 has dimensions which are defined for Spray a predefined fuel flow at a predefined target temperature. The target 4 is also designed so that the thermal losses by conduction with the exhaust line, including the duct 1, are the smallest possible. The target 4 is disposed between the injection means 3 and the oxidation means 2. The device comprises means for heating the target. According to the invention, these heating means comprise a first 3 element 10 accumulating the heat of the exhaust gases leaving the oxidation means 2 and a second element 20 which is heat conducting and which is connected on the one hand to the first element 10 and secondly to the target 4. The materials used for the two elements are for example metallic materials, such as aluminum or copper, because they are good conductors of heat. The first element 10 is preferably disposed in the exhaust gas stream leaving the oxidation catalyst 2, and is designed to minimize disturbances of the exhaust gas flow. The device according to the invention uses the inventive method which consists of treating the HC CO of the exhaust gas by an oxidation reaction, then taking a part of the heat of the treated exhaust gas to heat a reducing agent introduced. upstream of HC and CO treatment of the exhaust gases. The HC and CO that are treated can come from the engine or the fuel injector 3 in the pipe 1. The particularity of the oxidation catalyst 2 is that the oxidation reaction of HC and CO that takes place there is exothermic, which makes the exhaust gases hotter downstream of the catalyst 2 than upstream. It is thus possible to use this heat to heat the sputtering target 4 and to promote the vaporization of the fuel when the conditions do not allow it. The heat part of the exhaust gas can preferably be done by a disturbance of the flow, the smallest possible. According to FIG. 3, the first element 10 may consist of fins 11 arranged around a central part 12. The fins 11 increase the exchange surface with the flow of exhaust gases leaving the oxidation catalyst 2, to heat the first element 10 as quickly as possible to the temperature of the exhaust gas. The second element 20 can be made in the form of a conductive bar, preferably a metal rod, which can be covered with a layer of thermally insulating material, in order to return the heat withdrawn to the exhaust gases without loss of heat towards the target 4. The conductive bar may comprise the central piece 12 around which are disposed the fins 11, this part not being covered with the layer of insulating material. The opposite end may be connected to the target, or may itself be the target. The thermal inertia of the second element 20 is preferably lower than that of the pipe 1. According to the embodiment of FIG. 1, the second element 20 of the heating means passes through the oxidation catalyst 2. The oxidation catalyst 2 is realized so that it defines a through hole for the passage of the second element 20. The advantage is that the second element 20 can thus have the smallest thermal inertia possible because it connects the first element 10 to the target 4 by the shortest way.

Selon le mode de réalisation de la figure 2, le deuxième élément 20 des moyens de chauffage traverse la paroi du conduit 1 et relie le premier élément 10 à la cible 4 par l'extérieur du conduit 1. Pour y parvenir, le deuxième élément 20 traverse la paroi du conduit 1 en amont et en aval du catalyseur 2. According to the embodiment of FIG. 2, the second element 20 of the heating means passes through the wall of the duct 1 and connects the first element 10 to the target 4 via the outside of the duct 1. In order to achieve this, the second element 20 crosses the wall of the duct 1 upstream and downstream of the catalyst 2.

L'avantage de ce mode de réalisation est que le catalyseur 2 est plus simple, car le deuxième élément 20 en fait le tour sans le traverser, et donc que cette solution est plus économique. The advantage of this embodiment is that the catalyst 2 is simpler, because the second element 20 goes around without crossing it, and therefore this solution is more economical.

Claims (9)

Revendicationsclaims 1) Dispositif de dépollution des gaz d'échappement d'un moteur à combustion interne comportant un moyen d'injection (3) d'un agent réducteur sous forme liquide dans un conduit (1) traversé par les gaz d'échappement ; un moyen d'oxydation (2) des HC et CO contenu dans les gaz d'échappement, disposé en aval du moyen d'injection (3) ; une cible (4) de pulvérisation de l'agent réducteur ; des moyens de chauffage de la cible ; caractérisé en ce que les moyens de chauffage de la cible comportent : un premier élément (10) accumulant la chaleur des gaz d'échappement qui sortent du moyen d'oxydation (2) ; et un deuxième élément (20) conducteur de chaleur, relié d'une part au premier élément (10) et d'autre part à la cible (4). 1) Exhaust gas depollution device of an internal combustion engine comprising means for injecting (3) a reducing agent in liquid form into a conduit (1) through which the exhaust gas flows; an oxidation means (2) for HC and CO contained in the exhaust gas, disposed downstream of the injection means (3); a target (4) for spraying the reducing agent; means for heating the target; characterized in that the means for heating the target comprises: a first element (10) accumulating the heat of the exhaust gases exiting the oxidation means (2); and a second heat conducting element (20) connected on the one hand to the first element (10) and on the other hand to the target (4). 2) Dispositif selon la revendication précédente, caractérisé en ce que le premier élément (10) est métallique. 2) Device according to the preceding claim, characterized in that the first element (10) is metallic. 3) Dispositif selon la revendication précédente, caractérisé en ce que le deuxième élément (20) est une barre conductrice, de préférence métallique, et est recouvert d'une couche en matériau isolant thermiquement. 3) Device according to the preceding claim, characterized in that the second element (20) is a conductive bar, preferably metal, and is covered with a layer of thermally insulating material. 4) Dispositif selon la revendication précédente, caractérisé en ce que le premier élément (10) est constitué d'ailettes (11) disposées autour d'une pièce centrale (12). 4) Device according to the preceding claim, characterized in that the first element (10) consists of fins (11) arranged around a central piece (12). 5) Dispositif selon la revendication précédente, caractérisé en ce que le deuxième élément (20) traverse le moyen d'oxydation (2). 5) Device according to the preceding claim, characterized in that the second element (20) passes through the oxidation means (2). 6) Dispositif selon la revendication 4, caractérisé en ce que le deuxième élément (20) traverse la paroi du conduit (1) et relie le premier élément (10) à la cible (4) par l'extérieur du conduit (1). 5 5 6) Device according to claim 4, characterized in that the second element (20) through the wall of the duct (1) and connects the first element (10) to the target (4) from outside the duct (1). 5 5 7) Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que l'agent réducteur est du carburant. 7) Device according to any one of the preceding claims, characterized in that the reducing agent is fuel. 8) Moteur à combustion interne caractérisé en ce qu'il comporte un dispositif de dépollution des gaz d'échappement selon l'une quelconque des revendications précédentes. 8) Internal combustion engine characterized in that it comprises an exhaust gas depollution device according to any one of the preceding claims. 9) Procédé de dépollution des gaz d'échappement consistant à traiter les HC CO des gaz d'échappement par oxydation, puis à prélever une partie de la chaleur des gaz d'échappement traité pour chauffer un agent réducteur introduit en amont du traitement des HC et CO des gaz d'échappement. 9) Exhaust gas depollution process of treating the HC CO of the exhaust gases by oxidation and then taking part of the heat of the treated exhaust gas to heat a reducing agent introduced upstream of the treatment of HC and CO of the exhaust gas.
FR0760212A 2007-12-21 2007-12-21 Exhaust gas depolluting device for internal combustion engine, has heating unit with metallic element accumulating heat from exhaust gas and metallic conducting bar connected to element and reducing agent pulverization target Withdrawn FR2925583A3 (en)

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FR0760212A FR2925583A3 (en) 2007-12-21 2007-12-21 Exhaust gas depolluting device for internal combustion engine, has heating unit with metallic element accumulating heat from exhaust gas and metallic conducting bar connected to element and reducing agent pulverization target

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FR0760212A FR2925583A3 (en) 2007-12-21 2007-12-21 Exhaust gas depolluting device for internal combustion engine, has heating unit with metallic element accumulating heat from exhaust gas and metallic conducting bar connected to element and reducing agent pulverization target

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FR2925583A3 true FR2925583A3 (en) 2009-06-26

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012064253A1 (en) * 2010-11-08 2012-05-18 Scania Cv Ab Exhaust post-treatment device and method for a vehicle, with a reductant vaporising surface being warmed by a peltier element.
WO2013048309A1 (en) * 2011-09-26 2013-04-04 Scania Cv Ab Arrangement for introducing a liquid medium into exhaust gases from a combustion engine

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Publication number Priority date Publication date Assignee Title
US3854288A (en) * 1971-06-11 1974-12-17 Volkswagenwerk Ag Arrangement for exhaust gas cleaning
EP0325111A2 (en) * 1988-01-21 1989-07-26 Leistritz Aktiengesellschaft Filter and afterburning device for exhaust gases, especially for internal combustion engines
JPH09317440A (en) * 1996-05-24 1997-12-09 Nippon Soken Inc Exhaust particulate purifier for internal combustion engine
WO2004051059A1 (en) * 2002-12-05 2004-06-17 Zeuna-Stärker GmbH & Co. KG Motor vehicle provided with a diesel propulsion engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3854288A (en) * 1971-06-11 1974-12-17 Volkswagenwerk Ag Arrangement for exhaust gas cleaning
EP0325111A2 (en) * 1988-01-21 1989-07-26 Leistritz Aktiengesellschaft Filter and afterburning device for exhaust gases, especially for internal combustion engines
JPH09317440A (en) * 1996-05-24 1997-12-09 Nippon Soken Inc Exhaust particulate purifier for internal combustion engine
WO2004051059A1 (en) * 2002-12-05 2004-06-17 Zeuna-Stärker GmbH & Co. KG Motor vehicle provided with a diesel propulsion engine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012064253A1 (en) * 2010-11-08 2012-05-18 Scania Cv Ab Exhaust post-treatment device and method for a vehicle, with a reductant vaporising surface being warmed by a peltier element.
CN103189609A (en) * 2010-11-08 2013-07-03 斯堪尼亚商用车有限公司 Exhaust post-treatment device and method for a vehicle, with a reductant vaporising surface being warmed by a peltier element
RU2541361C2 (en) * 2010-11-08 2015-02-10 Сканиа Св Аб Device and method vehicle exhaust gases aftertreatment with recovery evaporating surface heated by peltier element
US9062582B2 (en) 2010-11-08 2015-06-23 Scania Cv Ab Exhaust post-treatment device and method for a vehicle, with a reductant vaporising surface being warmed by a Peltier element
CN103189609B (en) * 2010-11-08 2015-07-15 斯堪尼亚商用车有限公司 Exhaust post-treatment device and method for a vehicle, with a reductant vaporising surface being warmed by a peltier element
WO2013048309A1 (en) * 2011-09-26 2013-04-04 Scania Cv Ab Arrangement for introducing a liquid medium into exhaust gases from a combustion engine
US9103258B2 (en) 2011-09-26 2015-08-11 Scania Cv Ab Arrangement for introducing a liquid medium into exhaust combustion engine
RU2563440C1 (en) * 2011-09-26 2015-09-20 Сканиа Св Аб Device for introduction of liquid medium to exhaust gases leaving internal combustion engine

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