WO2008034981A1 - Arrangement for the pollution control of a motor vehicle internal combustion engine - Google Patents

Arrangement for the pollution control of a motor vehicle internal combustion engine Download PDF

Info

Publication number
WO2008034981A1
WO2008034981A1 PCT/FR2007/051741 FR2007051741W WO2008034981A1 WO 2008034981 A1 WO2008034981 A1 WO 2008034981A1 FR 2007051741 W FR2007051741 W FR 2007051741W WO 2008034981 A1 WO2008034981 A1 WO 2008034981A1
Authority
WO
WIPO (PCT)
Prior art keywords
plate
exhaust
liquid component
upstream
flow
Prior art date
Application number
PCT/FR2007/051741
Other languages
French (fr)
Inventor
Franck Alizon
Julien-Ange Maestroni
Waldemar Zawisza
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
Priority claimed from FR0653858A external-priority patent/FR2906303B1/en
Priority claimed from FR0653859A external-priority patent/FR2906304B1/en
Priority claimed from FR0653860A external-priority patent/FR2906305B1/en
Application filed by Renault S.A.S filed Critical Renault S.A.S
Publication of WO2008034981A1 publication Critical patent/WO2008034981A1/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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/10—Mixing gases with gases
    • B01F23/12—Mixing gases with gases with vaporisation of a liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/25—Mixing by jets impinging against collision plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/43197—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor characterised by the mounting of the baffles or obstructions
    • B01F25/431973—Mounted on a support member extending transversally through the mixing tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F35/93—Heating or cooling systems arranged inside the receptacle
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F2035/99—Heating
    • 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
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

  • the invention relates to an arrangement for the depollution of a motor vehicle engine.
  • the invention relates more particularly to an arrangement for the depollution of a motor vehicle engine, of the type which comprises at least one exhaust line, arranged downstream of a heat engine of the vehicle, which comprises at least one engine member. depollution which is intended to be traversed by the exhaust gas to ensure the depollution, and of the type in which the exhaust line comprises upstream of the depollution member, an upstream device for releasing a liquid component for to improve the efficiency of the pollution control member, and a downstream evaporation device which is intended to allow the vaporization of the released liquid component and its mixing with the exhaust gas prior to its introduction into the pollution control device.
  • the liquid component released upstream of the pollution control member by the injection device of a liquid component generally fails to be properly vaporized when it enters the pollution control device, and traces of component in liquid form remain in the exhaust gas entering the pollution control device.
  • the effectiveness and the reliability of the depollution device are di rectly related to the nature of the mixture that arrives in this organ. It is absolutely necessary that the depollution device be crossed only by a mixture in the gaseous state.
  • the invention provides an arrangement of the type previously described in which the downstream evaporation device does not oppose the flow of gases, while permitting optimum vaporization of the liquid component.
  • the downstream evaporation device comprises at least one duct at least one of which is arranged at the end of a plate which is oriented substantially axially in the direction of flow of the flow of water.
  • exhaust gas which is distant from the walls of the duct, of which at least an upstream portion is arranged in a diffusion zone the upstream device for releasing the liquid component and is intended to promote the evaporation of said liquid component and its mixture with the exhaust gas.
  • the downstream part of the plate is bent so as to cause a total flow of the mixture of exhaust gas and vaporized component.
  • the plate comprises a plurality of substantially transverse bores, which are inclined at a first angle determined in the direction of flow of the exhaust gas flow, and which are desti ned from It does not serve to promote the heating of the plate by the exhaust gas, and secondly to cause tearing of the liquid component stag on the plate by the exhaust gas and the evacuation of the component thus vaporized.
  • the plate deli mits in the conduit two flow streams of the exhaust gas flow, and which is fixed to a plate holder, in particular by welding or by stamping said plate holder, the plate holder being held by a junction flange arranged between the downstream end of a duct having the upstream device for releasing a liquid component and the upstream end of the duct.
  • FIG. 1 is a schematic view of an arrangement according to a first embodiment of the invention in which the downstream part of the plate occupies a recessed configuration
  • FIG. 2 is a diagrammatic view. of the arrangement of Figure 1 in which the downstream part of the plate occupies u does configu ration flattened
  • FIG. 3 is a variant of FIG. 1.
  • FIG. 4 is a schematic view of an arrangement according to the second embodiment of the invention.
  • FIG. 5 is a variant of FIG. 4,
  • FIG. 6 is a schematic view of an arrangement according to the third embodiment of the invention wherein the conduit comprises a plate attached to a plate holder held in the conduit by a flange.
  • FIG. 7 is a schematic view of a variant of Figure 6 wherein the conduit comprises a plurality of plates attached to a plate holder held in the conduit by a flange.
  • FIG. 8 is a schematic view of another variant of Figure 6 wherein the upstream portion of the plate has a boss on one of its faces
  • - Figure 9 is a schematic view of another variant of Figure 6 in which the upstream portion of the plate has a boss on each of its faces;
  • FIG. 10 is a schematic view of another variant of FIG. 6 in which the duct has a projecting appendage arranged axially upstream of the boss of the plate;
  • FIG. 11 is a schematic view of another variant of Figure 6 wherein the conduit comprises a plurality of offset plates and wherein the upstream release device comprises an injector;
  • - Figure 12 is a schematic view of another variant of Figure 6 wherein the conduit comprises a plurality of offset plates and wherein the upstream release device comprises a drip device.
  • the exhaust line of FIG. 1 comprises, upstream of the depollution device, an upstream device 10 for releasing a liquid component intended to improve the efficiency of the depollution device, and a device 12 downstream of evaporation which is intended to allow the vaporization of the liquid component "CL" and its mixture with the "G" exhaust gases prior to its introduction into the depollution device.
  • the upstream device 12 for releasing the liquid component "CL" is thus connected by its upstream end 14 to the exhaust line on the side of the heat engine (not shown), and delivers the exhaust gases in which the liquid component is mixed, its downstream end 16 in the upstream end 1 8 of the downstream evaporation member 12 which is connected by its downstream end 20 to the exhaust line on the side of the outlet (not shown) of the gases.
  • the downstream evaporation device comprises at least one duct 22 within which is arranged at least one plate which is oriented substantially axially in the direction of flow of the gas flow "G".
  • exhaust which is remote from the walls 26 of the duct 22, at least one upstream portion 28 is arranged in a zone 30 of diffusion of the upstream device 10 for releasing the liquid component and is intended to promote the evaporation of said liquid component "CL” and mixing with the exhaust gas "G", and a downstream curved portion 32 thereof is intended to cause a vortex flow "T" of the exhaust gas mixture and vaporized component.
  • the downstream curved portion 32 may progressively bend downstream of the plate 32, so that it determines in the duct 22 a restricted passage section 34 of the "G" gases which ensures mixing of the exhaust gases. G "and vaporized component.
  • the liquid component "CL” which is diffused on the plate 24 progresses from upstream to downstream on the plate 24 while evaporating, and the downstream part 32 of the plate 24 creates in a downstream zone 36, arranged immediately downstream of the restricted passage section 34, a swirling flow "T” of the exhaust gas mixture and vaporized component which further improves the mixing.
  • the flat plate 24 is of reduced thickness. This configuration makes it possible to cause its rapid heating up in the exhaust gas flow "G", a configuration which notably makes it possible, during the starting phases of the engine, to rapidly heat up the flat plate 24 so that it rapidly vaporizes the liquid component. CL ".
  • the reduced thickness of the plane plate 24 also makes it possible, unlike the known devices of the state of the art, not to oppose resistance to the flow of exhaust gas "G".
  • the plane plate 24 is arranged substantially in a median zone of the duct 22, so as to be quickly heated on both sides by the gas flow "G" exhaust.
  • this configuration also makes it possible to prevent the cooling of the flat plate 24, or at least the slowing down of the elevation of temperature of said flat plate 24, by the interaction of the walls 26 of the duct 22 with the external medium.
  • the upstream device 10 for releasing a liquid component “CL” comprises at least one liquid component injector 38 which is intended to spray said component liquid "CL” in the form of droplets in a spray cone 30 forming the diffusion zone in which is arranged the upstream portion 28 of the plate 24.
  • the upstream device 10 for releasing the liquid component "CL” comprises at least one device 40 of liquid component drip which is intended to deliver the liquid component in the form of drops to the right of a diffusion zone in which is arranged the upstream portion 28 of the plate.
  • This configuration allows to release in the exhaust gas "G” higher amounts of liquid component.
  • the downstream portion 32 of the plate can be selectively bent or not. Indeed, the downstream portion 32 curved of the plate 24 is likely to be flattened in the extension of the upstream portion 28 and the gas flow "G" exhaust when the temperature of the gas "G” exhaust is greater at a determined temperature.
  • the operating points of the engine most sensitive to pressure drop are also the operating points of the engine where the "G" exhaust gases are the hottest, and for which the downstream portion 32 bent is not necessary for a good vaporization of the liquid component "CL" in the "G” exhaust gas. It is therefore important to be able to flatten the downstream portion 32 curved, for any temperature above a predetermined temperature corresponding to the operating point of the engine described above.
  • At least the downstream portion 32 curved with the plate 24 may be made of a thermally deformable material from a predetermined temperature, so that said curved downstream portion 32 is flattened in the extension of the upstream portion 28 and the exhaust gas flow when the plate is subjected to exhaust gas temperature greater than the determined temperature, as shown in Figure 2.
  • the curved downstream portion of the plate could be flattened in the extension of the upstream portion 28 and the exhaust gas stream "G" by a mechanical external actuating device that would be controlled in response to detecting an exhaust gas temperature above a predetermined temperature.
  • the exhaust line comprises, upstream of the depollution device, a device 1 1 0 upstream of injection of a liquid component intended to improve the efficiency of the depollution, and a device 112 downstream evaporation which is intended to allow the vaporization of the liquid component "CL" and its mixture with the gas "G" exhaust prior to its introduction into the pollution control member.
  • the upstream injection device 110 of a liquid component is thus connected by its upstream end 114 to the exhaust line on the side of the engine (not shown), and delivers the exhaust gases in which the liquid component is mixed by its downstream end 116 in the upstream end 118 of the downstream evaporation member 112 which is connected by its downstream end 120 to the exhaust line on the outlet side (not shown) of the gases.
  • the downstream evaporation device 112 comprises at least one duct 122 in which is arranged a flat plate 124, which is oriented substantially axially in the direction of flow of the gas flow "G" of exhaust, which is remote from the walls 126 of the duct 122, at least one upstream portion 128 arranged in a zone 130 for spraying the injection device 110 upstream, which is intended to promote the evaporation of the liquid component "CL" and its mixture with the "G" exhaust gases, and a downstream portion 132 is intended to cause a swirling flow
  • the flat plate 124 is of reduced thickness.
  • This configuration makes it possible to cause its rapid heating up in the exhaust gas flow "G", a configuration which makes it possible, in particular during the starting phases of the engine, to rapidly heat up the flat plate 124 so that it rapidly vaporises the liquid component. CL ".
  • the plane plate 124 is arranged substantially in a median zone of the duct 122, so as to be rapidly heated on both sides by the exhaust gas stream "G". Compared to other known devices of the state of the art which are connected to the walls 126 of the duct 122, this configuration also makes it possible to prevent the cooling of the flat plate 124, or at least the slowing down of the rise of temperature of said flat plate 124, by the thermal interaction of the walls 126 of the duct 122 with the external medium.
  • the plane plate 124 comprises a plurality of substantially transverse bores 134 which are inclined at a first angle " ⁇ " determined in the direction of flow of the gas flow "G” of exhaust.
  • These holes 134 are intended to promote the heating of the flat plate 124 by the exhaust gas “G” passing through the holes 124. Furthermore, they are intended to cause tearing of the liquid component "CL” stagnant on the flat plate by exhaust gases "G” and the evacuation of the component thus vaporized.
  • the flat plate is arranged in the direction of the gas "G" exhaust, that is to say with a zero angle.
  • the plane plate 124 may be inclined by a second angle " ⁇ " determined in the duct 122.
  • This configuration makes it possible to divide the gas flow into an accelerated partial flow “G A " and a flow partial idle “GR", the flow "G A” occurring naturally in the divergence zone 136 created by the flat plate 124 in the conduit 122 and the flow "G R " being created in the zone 138 of restriction created by the plate plane 124.
  • the exhaust line comprises, upstream of the depollution device, an upstream device 20 for releasing a liquid component intended to improve the efficiency of the depollution device, and a device 21 evaporation downstream which is intended to allow the vaporization of the liquid component "CL" released and its mixing with the exhaust gas "G", prior to its introduction into the pollution control device.
  • the upstream device 21 0 for the release of a liquid component is thus connected by its upstream end 214 to the exhaust manifold on the thermal engine side (not shown), and delivers the exhaust gases in which the fuel is mixed.
  • liquid component through its downstream end 21 6 in the upstream end 21 8 of the evaporation downstream member 21 2 which is connected by its downstream end 220 to the exhaust line on the outlet side (not shown) of the gases .
  • the downstream evaporation device 21 comprises at least one duct 222, to which is arranged at least one plate 224 which is oriented substantially axially in the direction of flow of the gas flow.
  • "G" exhaust which is remote from the walls 226 of the duct 222, which deli mits in the conduit 222 two vei nes flow of gas flow G exhaust, and which is fixed, particularly by welding, to a plate holder 248 which may be held by a junction flange 250 interposed between the downstream end 21 6 of a duct comprising the upstream device 20 for the release of a liquid component "CL" and the end 21 upstream of the duct 222 comprising the device 21 2 downstream evaporation.
  • the plate 224 which may be retained in the conduit 222, allows the vaporization of the liquid component "CL" released in the conduit 222.
  • This general configuration has been shown in FIG.
  • the conduit 222 comprises a plurality of plates 224, which are fixed to the plate holder 248, which are offset vertically relative to each other and which overlap at least in part two by two axially, for allow the liquid component "CL" to evaporate by falling successively from one plate 224 to the other.
  • This configuration advantageously makes it possible to multiply the evaporation capacity in liquid component "CL", of the downstream evaporation member 212, by multiplying the number of plates 224.
  • each plate 224 is of reduced thickness. This configuration makes it possible to cause its rapid heating up in the exhaust gas flow "G", a configuration which makes it possible in particular during the starting phases of the engine to quickly heat the plate 24 so that it rapidly vaporizes the liquid component "CL".
  • the reduced thickness of the plate 224 also makes it possible, unlike the known devices of the state of the art, not to oppose resistance to the flow of exhaust gas "G".
  • the plate 224 is arranged substantially in a median zone of the duct 222, so as to be quickly heated on both sides by the gas flow "G" exhaust. Compared with other known devices of the state of the art which are connected to the walls 226 of the duct 222, this configuration also makes it possible to prevent the cooling of the plate 224, or at least the slowing down of the temperature rise. of said plate 224, by the interaction of the walls 226 of the conduit 222 with the external medium.
  • At least one upstream portion 228 of the plate 224 which is arranged in a diffusion zone 230 of the upstream device 210 for releasing the component Liquid "CL” includes at the nsa su ru of its faces 232, a boss 234 intended to create in the vei ne ne associated with a flow "G a " exhaust gas accelerated by ventu ri favoring the evaporation of said liquid component "CL", and its mixture with the "G” exhaust gas.
  • the plate 224 may comprise a single boss 234.
  • this side will be turned preferably on the side of the area 230 of release of the liquid component "CL" so that the maximum of this component is diffused on the boss 234 and then vaporized.
  • the plate 224 may comprise a boss 234 on each of its opposite faces 232. This configuration is particularly advantageous because it allows vaporization of the liquid component CL which would reach the plate on its face 232 situated on the opposite side to the zone 230 of release.
  • the plate 224 has a downstream portion
  • the duct 222 comprises on its wall 226, upstream of the boss 234 of the upstream portion 228 of the plate 224 and on the side of the face 232 of the plate 224. which carries the boss 234, a protruding appendage 238, which is intended to deflect the exhaust gas stream "G" to the boss 234 to accelerate heating of the plate.
  • this appendix 238 is more particularly intended to accelerate the heating of the plate 224 when the conduit 222 is flown by exhaust gas "G" reduced flow, which is the case for reduced speeds of rotation of the engine which correspond to su rcroit to a production of exhaust gas temperature reduced.
  • Appendix 238, in effect, compensates for relatively low temperatures. exhaust gases by orienting them on the boss 234, so as to accelerate its warming.
  • FIG. 10 there is shown a plate 224 having only one boss 234, but it will be understood that this appendix 238 can be associated with a plate 224 with two bosses 234 or any other form of plate 224 which will be described later in this description.
  • the arrangement may comprise additional means 240 for heating the boss 234 of the upstream portion 228 of the plate 224.
  • These means may consist of means reported inside the boss, for example an electrical resistance included in the boss or any other heating means.
  • each boss 224 may comprise a downstream face 242 whose slope decreases progressively to the downstream portion 236, so that the plate 224 has substantially a profile. 'fin.
  • FIGS. 11 and 12 This configuration has been shown in particular in FIGS. 11 and 12.
  • a plurality of plates 224 connected to the plate holder 248 for each duct are shown.
  • conduit 222 may comprise only one plate
  • the upstream device 210 for the release of the liquid component "CL" can comprise at least one injector 244 of liquid component which is intended to spray the liquid component in the form of droplets according to a spray cone 230 forming the diffusion 230 in which is arranged the upstream portion 228 of the plate 224.
  • the upstream device 21 0 for releasing the liquid component "CL" may comprise at least one drip device 246 which is intended to deliver liquid component in the form of drops to the right of a diffusion zone 230 in which is arranged the upstream portion 228 of the plate 224.
  • the invention therefore makes it possible to substantially improve the performance of a depollution device.

Landscapes

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

Abstract

The invention provides an arrangement for the pollution control of a motor vehicle internal combustion engine, of the type which comprises an exhaust line provided with an upstream device (10) for releasing a liquid component (CL) and a downstream device (12) for evaporating said component, these devices being intended to improve the efficiency of a downstream pollution-control member, characterized in that the downstream evaporation device (10) comprises at least one plate (24), of which at least one upstream part (28) is arranged in a diffusion region (30) of the component-releasing device (10) and of which a curved downstream part (32) is intended to bring about a swirling flow (T) of the mixture consisting of exhaust gas and vaporized component.

Description

« Agencement pour la dépollution d'un moteur thermique de véhicule automobile » "Arrangement for the depollution of a motor vehicle engine"
L'invention concerne un agencement pour la dépollution d'un moteur thermique de véhicule automobile. L'invention concerne plus particulièrement un agencement pour la dépollution d'un moteur thermique de véhicule automobile, du type qui comporte au moins une ligne d'échappement, agencée en aval d'un moteur thermique du véhicule, qui comporte au moins un organe de dépollution qui est destiné à être traversé par les gaz d'échappement pour en assurer la dépollution, et du type dans lequel la ligne d'échappement comporte en amont de l'organe de dépollution, un dispositif amont de libération d'un composant liquide destiné à améliorer l'efficacité de l'organe de dépollution, et un dispositif aval d'évaporation qui est destiné à permettre la vaporisation du composant liquide libéré et son mélange avec les gaz d'échappement préalablement à son introduction dans l'organe de dépollution.The invention relates to an arrangement for the depollution of a motor vehicle engine. The invention relates more particularly to an arrangement for the depollution of a motor vehicle engine, of the type which comprises at least one exhaust line, arranged downstream of a heat engine of the vehicle, which comprises at least one engine member. depollution which is intended to be traversed by the exhaust gas to ensure the depollution, and of the type in which the exhaust line comprises upstream of the depollution member, an upstream device for releasing a liquid component for to improve the efficiency of the pollution control member, and a downstream evaporation device which is intended to allow the vaporization of the released liquid component and its mixing with the exhaust gas prior to its introduction into the pollution control device.
On connaît de nombreux exemples d'agencements de ce type pour la dépollution d'un moteur thermique de véhicule automobile.Numerous examples of arrangements of this type are known for the depollution of a motor vehicle engine.
Les récents développements en matière de dépollution des moteurs thermiques conduisent de plus en plus les constructeurs automobiles à intégrer dans la ligne d'échappement des véhicules actuels des dispositifs de libération d'un composant liquide qui est destiné à être vaporisé en phase gazeuse pour être introduit dans l'organe de dépollution afin d'en améliorer l'efficacité.Recent developments in the field of pollution control of thermal engines increasingly lead car manufacturers to integrate in the exhaust line of current vehicles devices for releasing a liquid component that is intended to be vaporized in the gas phase to be introduced in the pollution control device in order to improve its efficiency.
Or, dans la plupart des véhicules actuels, la multiplication des organes inclus dans la ligne d'échappement a tendance à réduire la longueur de tubulures disponible en amont de l'organe de dépollution.However, in most current vehicles, the multiplication of the members included in the exhaust line tends to reduce the length of tubing available upstream of the pollution control member.
De ce fait, le composant liquide libéré en amont de l'organe de dépollution par le dispositif d'injection d'un composant liquide, ne parvient généralement à être vaporisé correctement lorsqu'il pénètre dans l'organe de dépollution, et des traces de composant sous forme liquide subsistent dans les gaz d'échappement qui pénètrent dans l'organe de dépollution.Therefore, the liquid component released upstream of the pollution control member by the injection device of a liquid component, generally fails to be properly vaporized when it enters the pollution control device, and traces of component in liquid form remain in the exhaust gas entering the pollution control device.
Or, l'efficacité et la du rabilité de l'organe de dépollution sont di rectement liées à la nature du mélange qui arrive dans cet organe. I l est absolument nécessai re que l'organe de dépollution ne soit traversé que par un mélange à l'état gazeux.However, the effectiveness and the reliability of the depollution device are di rectly related to the nature of the mixture that arrives in this organ. It is absolutely necessary that the depollution device be crossed only by a mixture in the gaseous state.
Pou r remédier à cet i nconvénient, il est con nu de proposer des dispositifs favorisant l'évaporation du composant liquide dans la lig ne d'échappement. I I peut s'agir en premier lieu de dispositifs externes à la lig ne d'échappement, tels que des résistances électriques ou des bougies, qui modifient considérablement l'encombrement de la lig ne d'échappement. Cette solution n'est pas acceptable car elle modifie l'implantation de la ligne d'échappement sur le véhicu le. I I peut s'agi r en second lieu de dispositifs i nternes à la lig ne d'échappement, tels que des grilles, plaques trouées ou éléments poreux, ou dispositifs desti nés à provoquer un mouvement aérodynamique tou rbi llon naire, mais qui sont disposés de manière perpendiculai re à l'écoulement des gaz. De ce fait, i ls imposent d'u ne part u ne contre-pression notoire à l'écou lement des gaz, et i ls pénalisent le rendement g lobal du moteur. D'autre part, bon nombre de ces dispositifs i nternes, sont sujets à l'encrassement et aux bouchages.In order to remedy this disadvantage, it is conceivable to propose devices that favor the evaporation of the liquid component in the exhaust system. It may be primarily devices external to the exhaust line, such as electrical resistors or candles, which significantly change the size of the exhaust lig. This solution is not acceptable because it modifies the implementation of the exhaust line on the vehicle. Secondly, there may be devices that are external to the exhaust system, such as grids, perforated plates or porous elements, or devices intended to cause aerodynamic motions, but which are arranged perpendicularly to the flow of gases. As a result, they impose a high level of back-pressure on the flow of gases, and they penalize the overall efficiency of the engine. On the other hand, many of these external devices are subject to fouling and clogging.
Pou r remédier à cet i nconvénient, l'i nvention propose un agencement du type décrit précédemment dans lequel le dispositif aval d'évaporation ne s'oppose pas à l'écoulement des gaz, tout en permettant une vaporisation opti male du composant liquide.In order to overcome this disadvantage, the invention provides an arrangement of the type previously described in which the downstream evaporation device does not oppose the flow of gases, while permitting optimum vaporization of the liquid component.
Dans ce but, l'i nvention propose que le dispositif aval d'évaporation comporte au moi ns un conduit au sei n duquel est agencée au moi ns u ne plaque qui est orientée sensiblement axialement dans le sens de l'écou lement du flux de gaz d'échappement, qui est distante des parois du conduit, dont au moi ns une partie amont est agencée dans une zone de diffusion du dispositif amont de libération du composant liquide et est desti née à favoriser l'évaporation dudit composant liquide et son mélange avec les gaz d'échappement.For this purpose, the invention proposes that the downstream evaporation device comprises at least one duct at least one of which is arranged at the end of a plate which is oriented substantially axially in the direction of flow of the flow of water. exhaust gas, which is distant from the walls of the duct, of which at least an upstream portion is arranged in a diffusion zone the upstream device for releasing the liquid component and is intended to promote the evaporation of said liquid component and its mixture with the exhaust gas.
Selon un premier mode de réalisation de l'invention , la partie aval de la plaque est recourbée de manière à provoquer u n écou lement tou rbi llonnai re du mélange de gaz d'échappement et de composant vaporisé.According to a first embodiment of the invention, the downstream part of the plate is bent so as to cause a total flow of the mixture of exhaust gas and vaporized component.
Selon un second mode de réalisation , la plaque comporte une pluralité de perçages sensiblement transversaux, qui sont incli nés d'un premier angle déterminé dans le sens de l'écou lement du flux de gaz d'échappement, et qui sont desti nés d'u ne part à favoriser le réchauffement de la plaque par les gaz d'échappement, et d'autre part à provoquer u n arrachement du composant liquide stag nant su r la plaque par les gaz d'échappement et l'évacuation du composant ainsi vaporisé.According to a second embodiment, the plate comprises a plurality of substantially transverse bores, which are inclined at a first angle determined in the direction of flow of the exhaust gas flow, and which are desti ned from It does not serve to promote the heating of the plate by the exhaust gas, and secondly to cause tearing of the liquid component stag on the plate by the exhaust gas and the evacuation of the component thus vaporized.
Selon un troisième mode de réalisation, la plaque déli mite dans le conduit deux veines d'écou lement du flux de gaz d'échappement, et qui est fixée à un porte-plaque, notam ment par soudage ou par emboutissage dudit porte-plaque, le porte-plaque étant maintenu par u ne bride de jonction i nterposée entre l'extrémité aval d'un conduit comportant le dispositif amont de libération d'un composant liquide et l'extrémité amont du conduit.According to a third embodiment, the plate deli mits in the conduit two flow streams of the exhaust gas flow, and which is fixed to a plate holder, in particular by welding or by stamping said plate holder, the plate holder being held by a junction flange arranged between the downstream end of a duct having the upstream device for releasing a liquid component and the upstream end of the duct.
D'autres caractéristiques et avantages de l'i nvention apparaîtront à la lecture de la description détaillée qui suit, pou r la compréhension de laquelle on se reportera aux dessi ns an nexés dans lesquels :Other characteristics and advantages of the invention will become apparent on reading the detailed description which follows, for the understanding of which reference will be made to the appended drawings in which:
- la figure 1 est u ne vue schématique d'u n agencement selon un premier mode de réalisation de l'i nvention dans lequel la partie aval de la plaque occupe u ne configuration recou rbée, - la figu re 2 est u ne vue schématique de l'agencement de la figure 1 dans laquelle la partie aval de la plaque occupe u ne configu ration aplanieFIG. 1 is a schematic view of an arrangement according to a first embodiment of the invention in which the downstream part of the plate occupies a recessed configuration, FIG. 2 is a diagrammatic view. of the arrangement of Figure 1 in which the downstream part of the plate occupies u does configu ration flattened
- la figu re 3 est u ne variante de la figure 1 . - la figure 4 est une vue schématique d'un agencement selon le deuxième mode de réalisation de l'invention,FIG. 3 is a variant of FIG. 1. FIG. 4 is a schematic view of an arrangement according to the second embodiment of the invention,
- la figure 5 est une variante de la figure 4,FIG. 5 is a variant of FIG. 4,
- la figure 6 est une vue schématique d'un agencement selon le troisième mode de réalisation de l'invention dans lequel le conduit comporte une plaque fixée à un porte-plaque maintenu dans le conduit par une bride.- Figure 6 is a schematic view of an arrangement according to the third embodiment of the invention wherein the conduit comprises a plate attached to a plate holder held in the conduit by a flange.
- la figure 7 est une vue schématique d'une variante de la figure 6 dans laquelle le conduit comporte une pluralité de plaques fixées à un porte-plaque maintenu dans le conduit par une bride.- Figure 7 is a schematic view of a variant of Figure 6 wherein the conduit comprises a plurality of plates attached to a plate holder held in the conduit by a flange.
- la figure 8 est une vue schématique d'une autre variante de la figure 6 dans laquelle la partie amont de la plaque comporte un bossage sur une des ses faces ; - la figure 9 est une vue schématique d'une autre variante de la figure 6 dans laquelle la partie amont de la plaque comporte un bossage sur chacune des ses faces ;- Figure 8 is a schematic view of another variant of Figure 6 wherein the upstream portion of the plate has a boss on one of its faces; - Figure 9 is a schematic view of another variant of Figure 6 in which the upstream portion of the plate has a boss on each of its faces;
- la figure 10 est une vue schématique d'une autre variante de la figure 6 dans laquelle le conduit comporte un appendice en saillie agencé axialement en amont du bossage de la plaque ;FIG. 10 is a schematic view of another variant of FIG. 6 in which the duct has a projecting appendage arranged axially upstream of the boss of the plate;
- la figure 11 est une vue schématique d'une autre variante de la figure 6 dans laquelle le conduit comporte une pluralité de plaques décalées et dans lequel le dispositif amont de libération comporte un injecteur ; - la figure 12 est une vue schématique d'une autre variante de la figure 6 dans laquelle le conduit comporte une pluralité de plaques décalées et dans lequel le dispositif amont de libération comporte un dispositif de goutte à goutte.- Figure 11 is a schematic view of another variant of Figure 6 wherein the conduit comprises a plurality of offset plates and wherein the upstream release device comprises an injector; - Figure 12 is a schematic view of another variant of Figure 6 wherein the conduit comprises a plurality of offset plates and wherein the upstream release device comprises a drip device.
La ligne d'échappement de la figure 1 comporte, en amont de l'organe de dépollution, un dispositif 10 amont de libération d'un composant liquide destiné à améliorer l'efficacité de l'organe de dépollution, et un dispositif 12 aval d'évaporation qui est destiné à permettre la vaporisation du composant liquide "CL" et son mélange avec les gaz "G" d'échappement préalablement à son introduction dans l'organe de dépollution.The exhaust line of FIG. 1 comprises, upstream of the depollution device, an upstream device 10 for releasing a liquid component intended to improve the efficiency of the depollution device, and a device 12 downstream of evaporation which is intended to allow the vaporization of the liquid component "CL" and its mixture with the "G" exhaust gases prior to its introduction into the depollution device.
Le dispositif 12 amont de libération du composant liquide "CL" est donc relié par son extrémité amont 14 à la ligne d'échappement du côté du moteur thermique (non représenté), et débite les gaz d'échappement auxquels sont mêlés le composant liquide, par son extrémité aval 16 dans l'extrémité amont 1 8 de l'organe 12 aval d'évaporation qui est relié par son extrémité aval 20 à la ligne d'échappement du côté de la sortie (non représentée) des gaz.The upstream device 12 for releasing the liquid component "CL" is thus connected by its upstream end 14 to the exhaust line on the side of the heat engine (not shown), and delivers the exhaust gases in which the liquid component is mixed, its downstream end 16 in the upstream end 1 8 of the downstream evaporation member 12 which is connected by its downstream end 20 to the exhaust line on the side of the outlet (not shown) of the gases.
Conformément à l'invention, le dispositif 10 aval d'évaporation comporte au moins un conduit 22 au sein duquel est agencée au moins une plaque 24 qui est orientée sensiblement axialement dans le sens de l'écoulement du flux de gaz "G" d'échappement, qui est distante des parois 26 du conduit 22, dont au moins une partie amont 28 est agencée dans une zone 30 de diffusion du dispositif 10 amont de libération du composant liquide et est destinée à favoriser l'évaporation dudit composant liquide "CL" et son mélange avec les gaz "G" d'échappement, et dont une partie aval 32 recourbée est destinée à provoquer un écoulement tourbillonnaire "T" du mélange de gaz d'échappement et de composant vaporisé.According to the invention, the downstream evaporation device comprises at least one duct 22 within which is arranged at least one plate which is oriented substantially axially in the direction of flow of the gas flow "G". exhaust, which is remote from the walls 26 of the duct 22, at least one upstream portion 28 is arranged in a zone 30 of diffusion of the upstream device 10 for releasing the liquid component and is intended to promote the evaporation of said liquid component "CL" and mixing with the exhaust gas "G", and a downstream curved portion 32 thereof is intended to cause a vortex flow "T" of the exhaust gas mixture and vaporized component.
La partie aval 32 recourbée peut se courber progressivement vers l'aval de la plaque 32, de telle sorte qu'elle détermine dans le conduit 22 une section de passage restreinte 34 des gaz "G" qui assure un brassage des gaz d'échappement "G" et du composant vaporisé.The downstream curved portion 32 may progressively bend downstream of the plate 32, so that it determines in the duct 22 a restricted passage section 34 of the "G" gases which ensures mixing of the exhaust gases. G "and vaporized component.
Le composant liquide "CL" qui est diffusé sur la plaque 24 progresse d'amont en aval sur la plaque 24 tout en s'évaporant, et la partie aval 32 de la plaque 24 crée dans une zone aval 36, agencée immédiatement en aval de la section de passage restreinte 34, un écoulement tourbillonnaire "T" du mélange de gaz d'échappement et de composant vaporisé qui améliore encore le mélange. Par ailleurs, la plaque plane 24 est d'épaisseur réduite. Cette configuration permet de provoquer son échauffement rapide dans le flux de gaz d'échappement "G", configuration qui permet notamment, lors des phases de démarrage du moteur, de chauffer rapidement la plaque plane 24 pour qu'elle vaporise rapidement le composant liquide "CL".The liquid component "CL" which is diffused on the plate 24 progresses from upstream to downstream on the plate 24 while evaporating, and the downstream part 32 of the plate 24 creates in a downstream zone 36, arranged immediately downstream of the restricted passage section 34, a swirling flow "T" of the exhaust gas mixture and vaporized component which further improves the mixing. In addition, the flat plate 24 is of reduced thickness. This configuration makes it possible to cause its rapid heating up in the exhaust gas flow "G", a configuration which notably makes it possible, during the starting phases of the engine, to rapidly heat up the flat plate 24 so that it rapidly vaporizes the liquid component. CL ".
Avantageusement, l'épaisseur réduite de la plaque plane 24 permet aussi, à la différence des dispositifs connus de l'état de la technique, de ne pas opposer de résistance au flux de gaz d'échappement "G".Advantageously, the reduced thickness of the plane plate 24 also makes it possible, unlike the known devices of the state of the art, not to oppose resistance to the flow of exhaust gas "G".
La plaque plane 24 est agencée sensiblement dans une zone médiane du conduit 22, de manière à être chauffée rapidement de part et d'autre par le flux de gaz "G" d'échappement. Par rapport à d'autres dispositifs connus de l'état de la technique qui sont liés aux parois 26 du conduit 22, cette configuration permet aussi d'éviter le refroidissement de la plaque plane 24, ou du moins le ralentissement de l'élévation de température de ladite plaque plane 24, par l'interaction des parois 26 du conduit 22 avec le milieu extérieur. Selon le mode de réalisation de l'i nvention qui a été représenté aux figures 1 et 2, le dispositif 10 amont de libération d'un composant liquide "CL" comporte au moins un injecteur 38 de composant liquide qui est destiné à pulvériser ledit composant liquide "CL" sous forme de gouttelettes selon un cône 30 de pulvérisation formant la zone de diffusion dans laquelle est agencée la partie amont 28 de la plaque 24.The plane plate 24 is arranged substantially in a median zone of the duct 22, so as to be quickly heated on both sides by the gas flow "G" exhaust. Compared with other known devices of the state of the art which are connected to the walls 26 of the duct 22, this configuration also makes it possible to prevent the cooling of the flat plate 24, or at least the slowing down of the elevation of temperature of said flat plate 24, by the interaction of the walls 26 of the duct 22 with the external medium. According to the embodiment of the invention which has been represented in FIGS. 1 and 2, the upstream device 10 for releasing a liquid component "CL" comprises at least one liquid component injector 38 which is intended to spray said component liquid "CL" in the form of droplets in a spray cone 30 forming the diffusion zone in which is arranged the upstream portion 28 of the plate 24.
Selon la variante de la figure 3, le dispositif 10 amont de libération du composant liquide "CL" comporte au moins un dispositif 40 de goutte à goutte de composant liquide qui est destiné à délivrer du composant liquide sous forme de gouttes au droit d'une zone 30 de diffusion dans laquelle est agencée la partie amont 28 de la plaque. Cette configuration permet de libérer dans les gaz d'échappement "G" des quantités supérieures de composant liquide. Une autre caractéristique essentielle de l'invention est que la partie aval 32 de la plaque peut être sélectivement recourbée ou non. En effet, la partie aval 32 recourbée de la plaque 24 est susceptible d'être aplanie dans le prolongement de la partie amont 28 et du flux de gaz "G" d'échappement lorsque la température des gaz "G" d'échappement est supérieure à une température déterminée.According to the variant of Figure 3, the upstream device 10 for releasing the liquid component "CL" comprises at least one device 40 of liquid component drip which is intended to deliver the liquid component in the form of drops to the right of a diffusion zone in which is arranged the upstream portion 28 of the plate. This configuration allows to release in the exhaust gas "G" higher amounts of liquid component. Another essential feature of the invention is that the downstream portion 32 of the plate can be selectively bent or not. Indeed, the downstream portion 32 curved of the plate 24 is likely to be flattened in the extension of the upstream portion 28 and the gas flow "G" exhaust when the temperature of the gas "G" exhaust is greater at a determined temperature.
En effet, les points de fonctionnement du moteur les plus sensibles aux pertes de charge sont aussi les points de fonctionnement du moteur où les gaz "G" d'échappement sont les plus chauds, et pour lesquels la partie aval 32 recourbée n'est pas nécessaire à une bonne vaporisation du composant liquide "CL" dans les gaz "G" d'échappement. I l importe donc de pouvoir aplanir la partie aval 32 recourbée, pour toute température supérieure à une température déterminée correspondant au point de fonctionnement du moteur précédemment décrit.Indeed, the operating points of the engine most sensitive to pressure drop are also the operating points of the engine where the "G" exhaust gases are the hottest, and for which the downstream portion 32 bent is not necessary for a good vaporization of the liquid component "CL" in the "G" exhaust gas. It is therefore important to be able to flatten the downstream portion 32 curved, for any temperature above a predetermined temperature corresponding to the operating point of the engine described above.
Ainsi, selon une configuration qui a été représentée à titre d'exemple aux figures 1 et 2, au moins la partie aval 32 recourbée de la plaque 24 peut être réalisée dans un matériau thermiquement déformable à partir d'une température déterminée, pour que ladite partie 32 aval recourbée s'aplanisse dans le prolongement de la partie amont 28 et du flux de gaz d'échappement lorsque la plaque est soumise à des gaz d'échappement de température supérieure à la température déterminée, comme représenté à la figure 2.Thus, according to a configuration that has been shown by way of example in FIGS. 1 and 2, at least the downstream portion 32 curved with the plate 24 may be made of a thermally deformable material from a predetermined temperature, so that said curved downstream portion 32 is flattened in the extension of the upstream portion 28 and the exhaust gas flow when the plate is subjected to exhaust gas temperature greater than the determined temperature, as shown in Figure 2.
En variante (non représentée), la partie aval recourbée de la plaque pourrait être aplanie dans le prolongement de la partie amont 28 et du flux de gaz "G" d'échappement par un dispositif mécanique d'actionnement extérieur qui serait commandé en réponse à la détection d'une température de gaz d'échappement supérieure à une température déterminée.Alternatively (not shown), the curved downstream portion of the plate could be flattened in the extension of the upstream portion 28 and the exhaust gas stream "G" by a mechanical external actuating device that would be controlled in response to detecting an exhaust gas temperature above a predetermined temperature.
Sur la figure 4, la ligne d'échappement comporte, en amont de l'organe de dépollution, un dispositif 1 1 0 amont d'injection d'un composant liquide destiné à améliorer l'efficacité de l'organe de dépollution, et un dispositif 112 aval d'évaporation qui est destiné à permettre la vaporisation du composant liquide "CL" et son mélange avec les gaz "G" d'échappement préalablement à son introduction dans l'organe de dépollution. Le dispositif 110 amont d'injection d'un composant liquide est donc relié par son extrémité amont 114 à la ligne d'échappement du côté du moteur thermique (non représenté), et débite les gaz d'échappement auxquels est mêlé le composant liquide par son extrémité aval 116 dans l'extrémité amont 118 de l'organe 112 aval d'évaporation qui est relié par son extrémité aval 120 à la ligne d'échappement du côté de la sortie (non représentée) des gaz.In FIG. 4, the exhaust line comprises, upstream of the depollution device, a device 1 1 0 upstream of injection of a liquid component intended to improve the efficiency of the depollution, and a device 112 downstream evaporation which is intended to allow the vaporization of the liquid component "CL" and its mixture with the gas "G" exhaust prior to its introduction into the pollution control member. The upstream injection device 110 of a liquid component is thus connected by its upstream end 114 to the exhaust line on the side of the engine (not shown), and delivers the exhaust gases in which the liquid component is mixed by its downstream end 116 in the upstream end 118 of the downstream evaporation member 112 which is connected by its downstream end 120 to the exhaust line on the outlet side (not shown) of the gases.
Conformément à l'invention, le dispositif 112 aval d'évaporation comporte au moins un conduit 122 au sein duquel est agencée une plaque plane 124, qui est orientée sensiblement axialement dans le sens de l'écoulement du flux de gaz "G" d'échappement, qui est distante des parois 126 du conduit 122, dont au moins une partie amont 128 agencée dans une zone 130 de pulvérisation du dispositif 110 amont d'injection, qui est destinée à favoriser l'évaporation du composant liquide "CL" et son mélange avec les "G" gaz d'échappement, et dont une partie aval 132 est destinée à provoquer un écoulement tourbillonnaireAccording to the invention, the downstream evaporation device 112 comprises at least one duct 122 in which is arranged a flat plate 124, which is oriented substantially axially in the direction of flow of the gas flow "G" of exhaust, which is remote from the walls 126 of the duct 122, at least one upstream portion 128 arranged in a zone 130 for spraying the injection device 110 upstream, which is intended to promote the evaporation of the liquid component "CL" and its mixture with the "G" exhaust gases, and a downstream portion 132 is intended to cause a swirling flow
"T" du mélange de gaz d'échappement et de composant vaporisé."T" of the exhaust gas mixture and vaporized component.
Plus particulièrement, la plaque plane 124 est d'épaisseur réduite. Cette configuration permet de provoquer son échauffe- ment rapide dans le flux de gaz d'échappement "G", configuration qui permet notamment lors des phases de démarrage du moteur de chauffer rapidement la plaque plane 124 pour qu'elle vaporise rapidement le composant liquide "CL". Avantageusement, l'épaisseur réduite de la plaque planeMore particularly, the flat plate 124 is of reduced thickness. This configuration makes it possible to cause its rapid heating up in the exhaust gas flow "G", a configuration which makes it possible, in particular during the starting phases of the engine, to rapidly heat up the flat plate 124 so that it rapidly vaporises the liquid component. CL ". Advantageously, the reduced thickness of the flat plate
24 permet aussi, à la différence des dispositifs connus de l'état de la technique, de ne pas opposer de résistance au flux de gaz d'échappement "G". La plaque plane 124 est agencée sensiblement dans une zone médiane du conduit 122, de manière à être chauffée rapidement de part et d'autre par le flux de gaz "G" d'échappement. Par rapport à d'autres dispositifs connus de l'état de la technique qui sont liés aux parois 126 du conduit 122, cette configuration permet aussi d'éviter le refroidissement de la plaque plane 124, ou du moins le ralentissement de l'élévation de température de ladite plaque plane 124, par l'interaction thermique des parois 126 du conduit 122 avec le milieu extérieur. Une autre caractéristique essentielle de l'invention est que la plaque plane 124 comporte une pluralité de perçages 134 sensiblement transversaux qui sont inclinés d'un premier angle "α" déterminé dans le sens de l'écoulement du flux de gaz "G" d'échappement. Ces perçages 134 sont destinés à favoriser le réchauffement de la plaque plane 124 par les gaz "G" d'échappement qui traversent les perçages 124. Par ailleurs, ils sont destinés à provoquer un arrachement du composant liquide "CL" stagnant sur la plaque plane par les gaz "G" d'échappement et l'évacuation du composant ainsi vaporisé.24 also makes it possible, unlike the known devices of the state of the art, not to oppose resistance to the flow of exhaust gas "G". The plane plate 124 is arranged substantially in a median zone of the duct 122, so as to be rapidly heated on both sides by the exhaust gas stream "G". Compared to other known devices of the state of the art which are connected to the walls 126 of the duct 122, this configuration also makes it possible to prevent the cooling of the flat plate 124, or at least the slowing down of the rise of temperature of said flat plate 124, by the thermal interaction of the walls 126 of the duct 122 with the external medium. Another essential feature of the invention is that the plane plate 124 comprises a plurality of substantially transverse bores 134 which are inclined at a first angle "α" determined in the direction of flow of the gas flow "G" of exhaust. These holes 134 are intended to promote the heating of the flat plate 124 by the exhaust gas "G" passing through the holes 124. Furthermore, they are intended to cause tearing of the liquid component "CL" stagnant on the flat plate by exhaust gases "G" and the evacuation of the component thus vaporized.
Sur la figure 4, la plaque plane est agencée suivant la direction des gaz "G" d'échappement, c'est à dire avec un angle nul.In Figure 4, the flat plate is arranged in the direction of the gas "G" exhaust, that is to say with a zero angle.
Selon la variante de la figure 5, la plaque plane 124 peut être est inclinée d'un second angle "β" déterminé dans le conduit 122. Cette configuration permet de diviser le flux gazeux en un flux partiel accéléré "GA" et un flux partiel ralenti "GR", le flux "GA" se créant naturellement dans la zone 136 de divergence créée par la plaque plane 124 dans le conduit 122 et le flux "GR" se créant dans la zone 138 de restriction créée par la plaque plane 124.According to the variant of FIG. 5, the plane plate 124 may be inclined by a second angle "β" determined in the duct 122. This configuration makes it possible to divide the gas flow into an accelerated partial flow "G A " and a flow partial idle "GR", the flow "G A " occurring naturally in the divergence zone 136 created by the flat plate 124 in the conduit 122 and the flow "G R " being created in the zone 138 of restriction created by the plate plane 124.
Ceci permet une accélération des gaz d'échappement issus de la zone 138 du flux accéléré vers la zone 136 de flux ralenti, au travers des perçages 134 sensiblement transversaux, et produit donc une amélioration de l'évaporation du composant liquide "CL".This allows an acceleration of the exhaust gases from the zone 138 of the accelerated flow to the zone 136 of slow flow, through the bores 134 substantially transverse, and thus produces an improvement in the evaporation of the liquid component "CL".
Sur la figu re 6 la ligne d'échappement comporte, en amont de l'organe de dépollution , un dispositif 21 0 amont de libération d'u n composant liquide destiné à améliorer l'efficacité de l'organe de dépollution , et u n dispositif 21 2 aval d'évaporation qui est desti né à permettre la vaporisation du composant liquide "CL" libéré et son mélange avec les gaz "G" d'échappement, préalablement à son i ntroduction dans l'organe de dépollution. Le dispositif 21 0 amont de libération d'un composant liquide, est donc relié par son extrémité amont 214 à la lig ne d'échappement du côté du moteu r thermique (non représenté), et débite les gaz d'échappement auxquels est mêlé le composant liquide par son extrémité aval 21 6 dans l'extrémité amont 21 8 de l'organe 21 2 aval d'évaporation qui est relié par son extrémité aval 220 à la ligne d'échappement du côté de la sortie (non représentée) des gaz.In FIG. 6, the exhaust line comprises, upstream of the depollution device, an upstream device 20 for releasing a liquid component intended to improve the efficiency of the depollution device, and a device 21 evaporation downstream which is intended to allow the vaporization of the liquid component "CL" released and its mixing with the exhaust gas "G", prior to its introduction into the pollution control device. The upstream device 21 0 for the release of a liquid component is thus connected by its upstream end 214 to the exhaust manifold on the thermal engine side (not shown), and delivers the exhaust gases in which the fuel is mixed. liquid component through its downstream end 21 6 in the upstream end 21 8 of the evaporation downstream member 21 2 which is connected by its downstream end 220 to the exhaust line on the outlet side (not shown) of the gases .
Conformément à l'invention, le dispositif 21 2 aval d'évaporation comporte au moins un conduit 222 au sei n duquel est agencée au moi ns u ne plaque 224 qui est orientée sensiblement axialement dans le sens de l'écou lement du flux de gaz "G" d'échappement, qui est distante des parois 226 du conduit 222, qui déli mite dans le conduit 222 deux vei nes d'écou lement du flux de gaz G d'échappement, et qui est fixée, notamment par soudage, à u n porte-plaque 248 qui est mai ntenu par une bride 250 de jonction interposée entre l'extrémité aval 21 6 d'un conduit comportant le dispositif 21 0 amont de libération d'u n composant liquide "CL" et l'extrémité 21 8 amont du conduit 222 comportant le dispositif 21 2 aval d'évaporation .In accordance with the invention, the downstream evaporation device 21 comprises at least one duct 222, to which is arranged at least one plate 224 which is oriented substantially axially in the direction of flow of the gas flow. "G" exhaust, which is remote from the walls 226 of the duct 222, which deli mits in the conduit 222 two vei nes flow of gas flow G exhaust, and which is fixed, particularly by welding, to a plate holder 248 which may be held by a junction flange 250 interposed between the downstream end 21 6 of a duct comprising the upstream device 20 for the release of a liquid component "CL" and the end 21 upstream of the duct 222 comprising the device 21 2 downstream evaporation.
Avantageusement, la plaque 224, ai nsi mai ntenue dans le conduit 222, permet la vaporisation du composant liquide "CL" libéré dans le conduit 222. Cette configuration générale a été représentée à la figure 6.Advantageously, the plate 224, which may be retained in the conduit 222, allows the vaporization of the liquid component "CL" released in the conduit 222. This general configuration has been shown in FIG.
Selon la variante de la figure 7, le conduit 222 comporte une pluralité de plaques 224, qui sont fixées au porte-plaque 248, qui sont décalées verticalement unes par rapport aux autres et qui se chevauchent au moins en partie deux à deux axialement, pour permettre au composant liquide "CL" de s'évaporer en tombant successivement d'une plaque 224 sur l'autre.According to the variant of Figure 7, the conduit 222 comprises a plurality of plates 224, which are fixed to the plate holder 248, which are offset vertically relative to each other and which overlap at least in part two by two axially, for allow the liquid component "CL" to evaporate by falling successively from one plate 224 to the other.
Cette configuration permet avantageusement de multiplier la capacité d'évaporation en composant liquide "CL", de l'organe 21 2 aval d'évaporation, en multipliant le nombre de plaques 224.This configuration advantageously makes it possible to multiply the evaporation capacity in liquid component "CL", of the downstream evaporation member 212, by multiplying the number of plates 224.
Quel que soit le nombre de plaques 224 employées, chaque plaque 224 est d'épaisseur réduite. Cette configuration permet de provoquer son échauffement rapide dans le flux de gaz d'échappement "G", configuration qui permet notamment lors des phases de démarrage du moteur de chauffer rapidement la plaque 24 pour qu'elle vaporise rapidement le composant liquide "CL".Regardless of the number of plates 224 employed, each plate 224 is of reduced thickness. This configuration makes it possible to cause its rapid heating up in the exhaust gas flow "G", a configuration which makes it possible in particular during the starting phases of the engine to quickly heat the plate 24 so that it rapidly vaporizes the liquid component "CL".
Avantageusement, l'épaisseur réduite de la plaque 224 permet aussi, à la différence des dispositifs connus de l'état de la technique, de ne pas opposer de résistance au flux de gaz d'échappement "G".Advantageously, the reduced thickness of the plate 224 also makes it possible, unlike the known devices of the state of the art, not to oppose resistance to the flow of exhaust gas "G".
La plaque 224 est agencée sensiblement dans une zone médiane du conduit 222, de manière à être chauffée rapidement de part et d'autre par le flux de gaz "G" d'échappement. Par rapport à d'autres dispositifs connus de l'état de la technique qui sont liés aux parois 226 du conduit 222, cette configuration permet aussi d'éviter le refroidissement de la plaque 224, ou du moins le ralentissement de l'élévation de température de ladite plaque 224, par l'interaction des parois 226 du conduit 222 avec le milieu extérieur.The plate 224 is arranged substantially in a median zone of the duct 222, so as to be quickly heated on both sides by the gas flow "G" exhaust. Compared with other known devices of the state of the art which are connected to the walls 226 of the duct 222, this configuration also makes it possible to prevent the cooling of the plate 224, or at least the slowing down of the temperature rise. of said plate 224, by the interaction of the walls 226 of the conduit 222 with the external medium.
Selon des modes de réalisation en variante qui ont été représentés aux figures 8 et suivantes, au moins une partie amont 228 de la plaque 224, qui est agencée dans une zone 230 de diffusion du dispositif 210 amont de libération du composant liquide "CL" comporte au moi ns su r u ne de ses faces 232, un bossage 234 destiné à créer dans la vei ne d'écou lement associée un flux "Ga" de gaz d'échappement accéléré par effet ventu ri favorisant l'évaporation dudit composant liquide "CL", et son mélange avec les gaz "G" d'échappement.According to alternative embodiments which have been represented in FIG. 8 and following, at least one upstream portion 228 of the plate 224, which is arranged in a diffusion zone 230 of the upstream device 210 for releasing the component Liquid "CL" includes at the nsa su ru of its faces 232, a boss 234 intended to create in the vei ne ne associated with a flow "G a " exhaust gas accelerated by ventu ri favoring the evaporation of said liquid component "CL", and its mixture with the "G" exhaust gas.
Ai nsi , selon la figu re 8, la plaque 224 peut comporter un unique bossage 234. Dans ce cas, le flux accéléré étant créé du côté de la plaque 224 qui comporte le bossage, ce côté sera tourné de préférence du côté de la zone 230 de libération du composant liquide "CL" afi n que le maximum de ce composant soit diffusé su r le bossage 234 et ensuite vaporisé.Ai nsi, according to Figure 8, the plate 224 may comprise a single boss 234. In this case, the accelerated flow being created on the side of the plate 224 which has the boss, this side will be turned preferably on the side of the area 230 of release of the liquid component "CL" so that the maximum of this component is diffused on the boss 234 and then vaporized.
Sur la figu re 9, la plaque 224 peut comporter un bossage 234 su r chacune de ses faces 232 opposées. Cette configu ration est particu lièrement avantageuse, car elle permet la vaporisation par effet ventu ri du composant liquide CL qui atteindrait la plaque su r sa face 232 située du côté opposé à la zone 230 de libération.In FIG 9, the plate 224 may comprise a boss 234 on each of its opposite faces 232. This configuration is particularly advantageous because it allows vaporization of the liquid component CL which would reach the plate on its face 232 situated on the opposite side to the zone 230 of release.
Dans tous les cas, la plaque 224 comporte une partie avalIn all cases, the plate 224 has a downstream portion
236 qui est desti née à provoquer un écoulement tou rbi llonnai re236 which is destined to provoke a total flow of
"T" du mélange de gaz d'échappement et de composant vaporisé. Selon u n cinquième mode de réalisation qui a été représenté à la figure 1 0, le conduit 222 comporte sur sa paroi 226, en amont du bossage 234 de la partie amont 228 de la plaque 224 et du côté de la face 232 de la plaque 224 qui porte le bossage 234, un appendice 238 en saillie, qui est desti né à dévier le flux de gaz "G" d'échappement vers le bossage 234 pour accélérer le chauffage de la plaque."T" of the exhaust gas mixture and vaporized component. According to a fifth embodiment which has been shown in FIG. 10, the duct 222 comprises on its wall 226, upstream of the boss 234 of the upstream portion 228 of the plate 224 and on the side of the face 232 of the plate 224. which carries the boss 234, a protruding appendage 238, which is intended to deflect the exhaust gas stream "G" to the boss 234 to accelerate heating of the plate.
En effet, cet appendice 238 est plus particulièrement desti né à accélérer le chauffage de la plaque 224 lorsque le conduit 222 est parcou ru par des gaz "G" d'échappement de débit réduit, ce qui est le cas pour des vitesses réduites de rotation du moteur qui correspondent de su rcroît à une production de gaz d'échappement de températu re réduite. L'appendice 238, en sai llie, permet de compenser la températu re relativement réduite des gaz d'échappement en les orientant sur le bossage 234, de manière à accélérer son réchauffement.Indeed, this appendix 238 is more particularly intended to accelerate the heating of the plate 224 when the conduit 222 is flown by exhaust gas "G" reduced flow, which is the case for reduced speeds of rotation of the engine which correspond to su rcroit to a production of exhaust gas temperature reduced. Appendix 238, in effect, compensates for relatively low temperatures. exhaust gases by orienting them on the boss 234, so as to accelerate its warming.
Sur la figure 1 0, il a été représenté une plaque 224 ne comportant qu'un seul bossage 234, mais il sera compris que cette appendice 238 peut être associé à une plaque 224 à deux bossages 234 ou à tout autre forme de plaque 224 qui sera décrite dans la suite de la présente description.In FIG. 10, there is shown a plate 224 having only one boss 234, but it will be understood that this appendix 238 can be associated with a plate 224 with two bosses 234 or any other form of plate 224 which will be described later in this description.
Il existe aussi d'autres possibilités de pallier à un débit de gaz "G" ne permettant qu'insuffisamment de réchauffer la plaque 224.There are also other possibilities to overcome a gas flow "G" not allowing enough to warm the plate 224.
Ainsi, en variante, comme l'illustre la figure 9, l'agencement peut comporter des moyens 240 supplémentaires de chauffage du bossage 234 de la partie amont 228 de la plaque 224. Ces moyens peuvent consister en des moyens rapportés à l'intérieur du bossage, par exemple une résistance électrique incluse dans le bossage ou tout autre moyen de chauffage.Thus, alternatively, as illustrated in FIG. 9, the arrangement may comprise additional means 240 for heating the boss 234 of the upstream portion 228 of the plate 224. These means may consist of means reported inside the boss, for example an electrical resistance included in the boss or any other heating means.
Il est aussi possible, en variante (non représentée) d'utiliser dans l'agencement des moyens de diffusion sur la plaque 224 d'un composé chimique supplémentaire permettant d'abaisser la température d'évaporation du composant liquide, de sorte qu'un réchauffement élevé de la plaque 224 ne soit plus nécessaire.It is also possible alternatively (not shown) to use in the arrangement diffusion means on the plate 224 an additional chemical compound for lowering the evaporation temperature of the liquid component, so that High warming of plate 224 is no longer necessary.
Une autre caractéristique avantageuse des modes de réalisation de l'invention comportant des bossages 224 est que chaque bossage 224 peut comporter une face aval 242 dont la pente décroît progressivement jusqu'à la partie aval 236, pour que la plaque 224 présente sensiblement un profil d'ailette.Another advantageous characteristic of the embodiments of the invention comprising bosses 224 is that each boss 224 may comprise a downstream face 242 whose slope decreases progressively to the downstream portion 236, so that the plate 224 has substantially a profile. 'fin.
Cette configuration a été représentée en particulier aux figures 1 1 et 12. Sur ces figures on a représenté une pluralité de plaques 224 reliées au porte-plaque 248 pour chaque conduitThis configuration has been shown in particular in FIGS. 11 and 12. In these figures, a plurality of plates 224 connected to the plate holder 248 for each duct are shown.
222, mais le conduit 222 peut ne comporter qu'une seule plaque222, but the conduit 222 may comprise only one plate
224, du type précédemment décrit. Selon la figure 1 1 , le dispositif 210 amont de libération du composant liquide "CL" peut comporter au moins un injecteur 244 de composant liquide qui est destiné à pulvériser le composant liquide sous forme de gouttelettes selon un cône 230 de pulvérisation formant la zone de diffusion 230 dans laquelle est agencée la partie amont 228 de la plaque 224.224, of the type previously described. According to FIG. 11, the upstream device 210 for the release of the liquid component "CL" can comprise at least one injector 244 of liquid component which is intended to spray the liquid component in the form of droplets according to a spray cone 230 forming the diffusion 230 in which is arranged the upstream portion 228 of the plate 224.
En variante, selon la figure 1 2, le dispositif 21 0 amont de libération du composant liquide "CL" peut comporter au moins un dispositif 246 de goutte à goutte qui est destiné à délivrer du composant liquide sous forme de gouttes au droit d'une zone 230 de diffusion dans laquelle est agencée la partie amont 228 de la plaque 224.As a variant, according to FIG. 12, the upstream device 21 0 for releasing the liquid component "CL" may comprise at least one drip device 246 which is intended to deliver liquid component in the form of drops to the right of a diffusion zone 230 in which is arranged the upstream portion 228 of the plate 224.
L'invention permet donc d'améliorer sensiblement les performances d'un organe de dépollution. The invention therefore makes it possible to substantially improve the performance of a depollution device.

Claims

REVEN DICATIONS REVEN DICATIONS
1 . Agencement pour la dépollution d'un moteur thermique de véhicule automobile, du type qui comporte au moins une ligne d'échappement, agencée en aval d'un moteur thermique du véhicule, qui comporte au moins un organe de dépollution qui est destiné à être traversé par les gaz d'échappement pour en assurer la dépollution, et du type dans lequel la ligne d'échappement comporte en amont de l'organe de dépollution, un dispositif (10) amont de libération d'un composant liquide (CL) destiné à améliorer l'efficacité de l'organe de dépollution, et un dispositif (1 2) aval d'évaporation qui est destiné à permettre la vaporisation du composant liquide (CL) libéré et son mélange avec les gaz (G) d'échappement préalablement à son introduction dans l'organe de dépollution, caractérisé en ce que le dispositif (10) aval d'évaporation comporte au moins un conduit (22) au sein duquel est agencée au moins une plaque (24) qui est orientée sensiblement axialement dans le sens de l'écoulement du flux de gaz (G) d'échappement, qui est distante des parois (26) du conduit (22), dont au moins une partie amont (28) est agencée dans une zone (30) de diffusion du dispositif (10) amont de libération du composant liquide et est destinée à favoriser l'évaporation dudit composant liquide (CL) et son mélange avec les gaz (G) d'échappement, et dont une partie aval (32) recourbée est destinée à provoquer un écoulement tourbillonnaire (T) du mélange de gaz d'échappement et de composant vaporisé.1. Arrangement for the depollution of a motor vehicle engine, of the type which comprises at least one exhaust line, arranged downstream of a heat engine of the vehicle, which comprises at least one depollution device which is intended to be crossed by the exhaust gases to ensure the depollution thereof, and of the type in which the exhaust line comprises upstream of the depollution device, an upstream device (10) for releasing a liquid component (CL) for improve the efficiency of the depollution device, and a device (1 2) downstream of evaporation which is intended to allow the vaporization of the liquid component (CL) released and its mixture with the exhaust gas (G) prior to its introduction into the depollution device, characterized in that the device (10) downstream evaporation comprises at least one conduit (22) in which is arranged at least one plate (24) which is oriented substantially axially in the ns the flow of the exhaust gas stream (G), which is remote from the walls (26) of the conduit (22), at least one upstream portion (28) is arranged in a zone (30) of diffusion of device (10) upstream of liquid component release and is intended to promote the evaporation of said liquid component (CL) and its mixture with the exhaust gas (G), and a curved downstream portion (32) is intended to cause a vortex flow (T) of the exhaust gas mixture and vaporized component.
2. Agencement selon la revendication 1 , caractérisé en ce que la plaque (24) est d'épaisseur réduite pour d'une part provoquer son échauffement rapide dans le flux de gaz (G) d'échappement et d'autre part pour ne pas opposer de résistance au flux de gaz (G) d'échappement.2. Arrangement according to claim 1, characterized in that the plate (24) is of reduced thickness to firstly cause its rapid heating in the exhaust gas stream (G) and secondly not to opposing resistance to the gas flow (G) exhaust.
3. Agencement selon la revendication 2, caractérisé en ce que la plaque (24) est agencée sensiblement dans une zone médiane du conduit (22), de manière à être chauffée rapidement de part et d'autre par le flux de gaz (G) d'échappement.3. Arrangement according to claim 2, characterized in that the plate (24) is arranged substantially in a zone median duct (22), so as to be rapidly heated on both sides by the gas flow (G) exhaust.
4. Agencement selon la revendication 1 , 2 ou 3, caractérisé en ce que le dispositif ( 1 0) amont de libération d'un composant liquide (CL) comporte au moi ns un injecteu r de composant liquide qui est destiné à pu lvériser ledit composant liquide sous forme de gouttelettes selon un cône de pu lvérisation formant la zone de diffusion dans laquelle est agencée la partie amont de la plaque. 4. Arrangement according to claim 1, 2 or 3, characterized in that the device (1 0) upstream release of a liquid component (CL) comprises at least ns a liquid component injector that is intended to lveriser said liquid component in the form of droplets in a spray cone forming the diffusion zone in which is arranged the upstream portion of the plate.
5. Agencement selon l'u ne des revendications 1 à 3, caractérisé en ce que le dispositif ( 1 0) amont de libération d'un composant liquide (CL) comporte au moi ns un dispositif de goutte à goutte de composant liquide qui est desti né à délivrer du composant liquide sous forme de gouttes au droit d'u ne zone de diffusion dans laquelle est agencée la partie amont de la plaque.5. Arrangement according to one of claims 1 to 3, characterized in that the device (1 0) upstream release of a liquid component (CL) comprises at least ns a liquid component drip device which is Desti ned to deliver the liquid component in the form of drops in the right of a diffusion zone in which is arranged the upstream part of the plate.
6. Agencement selon l'une des revendications précédentes, caractérisé en ce que la partie aval (32) recourbée de la plaque (24) est susceptible d'être aplanie dans le prolongement de la partie amont (28) et du flux de gaz (G) d'échappement lorsque la température des gaz (G) d'échappement est supérieu re à u ne température détermi née.6. Arrangement according to one of the preceding claims, characterized in that the downstream portion (32) bent of the plate (24) is capable of being flattened in the extension of the upstream portion (28) and the flow of gas ( G) exhaust when the temperature of the exhaust gas (G) is higher than a determined temperature.
7. Agencement selon la revendication 6, caractérisé en ce que au moins la partie aval recou rbée (32) de la plaque (24) est réalisée dans un matériau thermiquement déformable à parti r d'u ne température détermi née, pou r que ladite partie aval (32) recourbée s'aplanisse dans le prolongement de la partie amont (28) et du flux de gaz (G) d'échappement lorsque la plaque (24) est soumise à des gaz (G) d'échappement de températu re supérieure à la température déterminée. 7. Arrangement according to claim 6, characterized in that at least the bent downstream portion (32) of the plate (24) is made of a thermally deformable material from a determined temperature, for r that said downstream portion (32) curved flattened in the extension of the upstream portion (28) and the exhaust gas stream (G) when the plate (24) is subjected to gas (G) exhaust temperature higher than the determined temperature.
8. Agencement selon la revendication 6, caractérisé en ce qu'au moins la partie aval (32) recou rbée de la plaque (24) est susceptible d'être aplanie dans le prolongement de la partie amont (28) et du flux de gaz (G) d'échappement par u n dispositif mécanique d'actionnement extérieu r qui est commandé en réponse à la détection d'une température de gaz (G) d'échappement supérieure à une température déterminée.8. Arrangement according to claim 6, characterized in that at least the downstream portion (32) recou rbée of the plate (24) is capable of being flattened in the extension of the upstream portion (28) and the flow of gas (G) exhaust by a mechanical external actuating device which is controlled by response to detecting an exhaust gas temperature (G) greater than a predetermined temperature.
9. Agencement pour la dépollution d'un moteur thermique de véhicule automobile, du type qui comporte au moins une ligne d'échappement, agencée en aval d'un moteur thermique du véhicule, qui comporte au moins un organe de dépollution qui est destiné à être traversé par les gaz d'échappement pour en assurer la dépollution, et du type dans lequel la ligne d'échappement comporte en amont de l'organe de dépollution, un dispositif (110) amont d'injection d'un composant liquide (CL) destiné à améliorer l'efficacité de l'organe de dépollution, et un dispositif (112) aval d'évaporation qui est destiné à permettre la vaporisation du composant liquide (CL) et son mélange avec les gaz (G) d'échappement préalablement à son introduction dans l'organe de dépollution, caractérisé en ce que le dispositif (112) aval d'évaporation comporte au moins un conduit (122) au sein duquel est agencée au moins une plaque (124) plane qui est orientée sensiblement axialement dans le sens de l'écoulement du flux de gaz (G) d'échappement, qui est distante des parois (126) du conduit (122), dont au moins une partie amont (128), qui est agencée dans une zone (130) de pulvérisation du dispositif (110) amont d'injection, est destinée à favoriser l'évaporation du composant liquide (CL) et son mélange avec les gaz (G) d'échappement, et dont une partie aval (132) est destinée à provoquer un écoulement tourbillonnaire (T) du mélange de gaz d'échappement et de composant vaporisé, comporte une pluralité de perçages (134) sensiblement transversaux qui sont inclinés d'un premier angle (α) déterminé dans le sens de l'écoulement du flux de gaz (G) d'échappement, et qui sont destinés d'un part à favoriser le réchauffement de la plaque (124) par les gaz (G) d'échappement et d'autre part à provoquer un arrachement du composant liquide (CL) stagnant sur la plaque par les gaz (G) d'échappement et l'évacuation du composant ainsi vaporisé. 9. Arrangement for the depollution of a motor vehicle engine, of the type which comprises at least one exhaust line, arranged downstream of a heat engine of the vehicle, which comprises at least one depollution device which is intended for to be crossed by the exhaust gases to ensure the depollution, and the type in which the exhaust line comprises upstream of the pollution control member, a device (110) upstream injection of a liquid component (CL ) for improving the efficiency of the depollution device, and a device (112) downstream evaporation which is intended to allow the vaporization of the liquid component (CL) and its mixture with the gas (G) previously exhaust its introduction into the pollution control device, characterized in that the device (112) downstream evaporation comprises at least one conduit (122) in which is arranged at least one plate (124) which is oriented substantially axially in the ens of the flow of the exhaust gas stream (G), which is remote from the walls (126) of the duct (122), of which at least one upstream portion (128), which is arranged in a zone (130) of spraying the device (110) upstream injection, is intended to promote the evaporation of the liquid component (CL) and its mixture with the exhaust gas (G), and a downstream portion (132) is intended to cause a vortex flow (T) of the exhaust gas and vapor component mixture, comprises a plurality of substantially transverse bores (134) which are inclined at a first angle (α) determined in the flow direction of the gas stream (G) exhaust, and which are intended on the one hand to promote heating of the plate (124) by the exhaust gases (G) and secondly to cause tearing of the liquid component (CL) stagnant on the plate by the exhaust gases (G) and the evacuation of the component thus vaporized.
10. Agencement selon la revendication 9, caractérisé en ce que la plaque plane (124) est inclinée d'un second angle (β) déterminé dans le conduit (122) pour diviser le flux gazeux (G) en un flux partiel accéléré (GA) et un flux partiel ralenti (GR) qui permettent une accélération des gaz d'échappement issus de la zone (38) du flux (GA) accéléré vers la zone (136) de flux ralenti (GR), au travers des perçages (34) sensiblement transversaux.10. Arrangement according to claim 9, characterized in that the plane plate (124) is inclined by a second angle (β) determined in the conduit (122) to divide the gas flow (G) into an accelerated partial flow (G A ) and an idle partial flow (G R ) which allow an acceleration of the exhaust gases from the zone (38) of the flow (G A ) accelerated to the zone (136) of idle flow (G R ), through holes (34) substantially transverse.
11. Agencement selon la revendication 9 ou 10 caractérisé en ce que la plaque plane (124) est d'épaisseur réduite pour d'une part provoquer son échauffement rapide dans le flux de gaz (G) d'échappement et d'autre part pour ne pas opposer de résistance au flux de gaz (G) d'échappement.11. An arrangement according to claim 9 or 10 characterized in that the flat plate (124) is of reduced thickness to firstly cause its rapid heating in the exhaust gas stream (G) and secondly for do not resist the exhaust gas flow (G).
12. Agencement selon la revendication 9, 10 ou 11 caractérisé en ce que la plaque plane (124) est agencée sensiblement dans une zone médiane du conduit (122), de manière à être chauffée rapidement de part et d'autre par le flux de gaz (G)d'échappement.12. Arrangement according to claim 9, 10 or 11 characterized in that the flat plate (124) is arranged substantially in a central zone of the duct (122), so as to be rapidly heated on either side by the flow of gas (G) exhaust.
13. Agencement pour la dépollution d'un moteur thermique de véhicule automobile, du type qui comporte au moins une ligne d'échappement, agencée en aval d'un moteur thermique du véhicule, qui comporte au moins un organe de dépollution qui est destiné à être traversé par les gaz d'échappement pour en assurer la dépollution, et du type dans lequel la ligne d'échappement comporte en amont de l'organe de dépollution, un dispositif (210) amont de libération d'un composant liquide (CL) destiné à améliorer l'efficacité de l'organe de dépollution, et un dispositif (212) aval d'évaporation qui est destiné à permettre la vaporisation du composant liquide (CL) libéré et son mélange avec les gaz (G) d'échappement préalablement à son introduction dans l'organe de dépollution, caractérisé en ce que le dispositif (210) aval d'évaporation comporte au moins un conduit (222) au sein duquel est agencée au moins une plaque (224) qui est orientée sensiblement axialement dans le sens de l'écoulement du flux de gaz (G) d'échappement, qui est distante des parois (226) du conduit (222), qui délimite dans le conduit (222) deux veines d'écoulement du flux de gaz (G) d'échappement, et qui est fixée à un porte-plaque (248), notamment par soudage ou par emboutissage dudit porte-plaque (248), le porte-plaque (248) étant maintenu par une bride (250) de jonction interposée entre l'extrémité aval (21 6) d'un conduit comportant le dispositif (210) amont de libération d'un composant liquide (CL) et l'extrémité (21 8) amont du conduit (222) comportant le dispositif (212) aval d'évaporation.13. Arrangement for the depollution of a motor vehicle engine, of the type which comprises at least one exhaust line, arranged downstream of a heat engine of the vehicle, which comprises at least one depollution device which is intended for to be crossed by the exhaust gas to ensure the depollution, and of the type in which the exhaust line comprises upstream of the pollution control member, an upstream device (210) for releasing a liquid component (CL) intended to improve the efficiency of the depollution device, and a device (212) downstream evaporation which is intended to allow the vaporization of the liquid component (CL) released and its mixture with the gas (G) exhaust beforehand at its introduction in the depollution device, characterized in that the device (210) downstream of evaporation comprises at least one conduit (222) in which is arranged at least one plate (224) which is oriented substantially axially da ns the flow direction of the gas flow (G) exhaust pipe, which is remote from the walls (226) of the duct (222), which delimits in the duct (222) two flow veins of the exhaust gas stream (G), and which is fixed to a carrier plate (248), in particular by welding or stamping said plate holder (248), the plate holder (248) being held by a junction flange (250) interposed between the downstream end (21 6) of a conduit comprising the upstream device (210) for releasing a liquid component (CL) and the upstream end (218) of the duct (222) comprising the downstream evaporation device (212).
14. Agencement selon la revendication 1 3, caractérisé en ce qu'au moins une partie amont (228) de la plaque (224), qui est agencée dans une zone (230) de diffusion du dispositif (210) amont de libération du composant liquide comporte au moins sur une de ses faces (232) un bossage (234) destiné à créer dans la veine d'écoulement associée un flux (G3) de gaz d'échappement accéléré par effet venturi favorisant l'évaporation dudit composant liquide (CL) et son mélange avec les gaz (G) d'échappement.14. Arrangement according to claim 1 3, characterized in that at least one upstream portion (228) of the plate (224), which is arranged in a zone (230) of diffusion of the device (210) upstream of the release of the component liquid comprises at least on one of its faces (232) a boss (234) intended to create in the associated flow channel a flow (G 3 ) of exhaust gas accelerated by venturi effect promoting the evaporation of said liquid component ( CL) and its mixture with the exhaust gases (G).
15. Agencement selon la revendication 14, caractérisé en ce que la plaque (224) comporte un bossage (234) sur chacune de ses faces (232) opposées.15. Arrangement according to claim 14, characterized in that the plate (224) has a boss (234) on each of its faces (232) opposite.
16. Agencement selon la revendication 1 3, 14 ou 1 5, caractérisé en ce que la plaque (224) comporte une partie aval (236) qui est destinée à provoquer un écoulement tourbillonnaire (T) du mélange de gaz d'échappement et de composant vaporisé.16. Arrangement according to claim 1 3, 14 or 1 5, characterized in that the plate (224) comprises a downstream portion (236) which is intended to cause a vortex flow (T) of the exhaust gas mixture and vaporized component.
17. Agencement selon la revendication précédente, caractérisé en ce que chaque bossage (234) comporte une face aval (242) dont la pente décroît progressivement jusqu'à la partie aval (236), pour que la plaque (224) présente sensiblement un profil d'ailette.17. Arrangement according to the preceding claim, characterized in that each boss (234) comprises a downstream face (242) whose slope decreases progressively to the downstream portion (236), so that the plate (224) substantially has a profile. fin.
18. Agencement selon l'une des revendications 13 à 1 7, caractérisé en ce que la plaque (224) est d'épaisseur réduite pour d'une part provoquer son échauffement rapide dans le flux de gaz (G) d'échappement et d'autre part pour ne pas opposer de résistance au flux de gaz (G) d'échappement.18. Arrangement according to one of claims 13 to 17, characterized in that the plate (224) is of reduced thickness to firstly cause its rapid heating in the gas flow (G) exhaust and secondly not to resist resistance to the gas flow (G) exhaust.
19. Agencement selon l'une des revendications 13 à 1 8, caractérisé en ce que la plaque (224) est agencée sensiblement dans une zone médiane du conduit (222), de manière à être chauffée rapidement de part et d'autre par le flux de gaz (G) d'échappement.19. Arrangement according to one of claims 13 to 18, characterized in that the plate (224) is arranged substantially in a central zone of the duct (222), so as to be rapidly heated on both sides by the gas flow (G) exhaust.
20. Agencement selon l'une des revendications 13 à 1 9, caractérisé en ce que le conduit (222) comporte sur sa paroi (226), en amont du bossage (234) de la partie amont (228) de la plaque (224) et du côté de la face (232) de la plaque (224) qui porte le bossage (234), un appendice (238) en saillie qui est destiné, notamment pour des débits de gaz (G) d'échappement réduits, à dévier le flux (G) de gaz d'échappement vers le bossage (234) pour accélérer le chauffage de la plaque (224).20. Arrangement according to one of claims 13 to 1 9, characterized in that the conduit (222) has on its wall (226), upstream of the boss (234) of the upstream portion (228) of the plate (224). ) and on the side (232) of the plate (224) which carries the boss (234), an appendage (238) projecting which is intended, in particular for reduced exhaust gas flow rates (G), to diverting the flow (G) of exhaust gas to the boss (234) to accelerate heating of the plate (224).
21 . Agencement selon l'une des revendications 13 à 20, caractérisé en ce qu'il comporte des moyens (240) supplémentaires de chauffage du bossage (234) de la partie amont (228) de la plaque (224). 21. Arrangement according to one of claims 13 to 20, characterized in that it comprises means (240) for heating the boss (234) of the upstream portion (228) of the plate (224).
22. Agencement selon l'u ne des revendications 1 3 à 21 , caractérisé en ce qu'il comporte des moyens de diffusion su r la plaque (224) d'un composé chimique permettant d'abaisser la température d'évaporation du composant liquide.22. Arrangement according to one of claims 1 3 to 21, characterized in that it comprises means for diffusion sur r the plate (224) of a chemical compound for lowering the evaporation temperature of the liquid component .
23. Agencement selon l'une des revendications 13 à 22 précédentes, caractérisé en ce que le dispositif (21 0) amont de libération d'un composant liquide (CL) comporte au moins un injecteur (244) de composant liquide (CL) qui est destiné à pulvériser ledit composant liquide sous forme de gouttelettes selon un cône (230) de pulvérisation formant la zone de diffusion dans laquelle est agencée la partie amont (228) de la plaque (224).23. Arrangement according to one of claims 13 to 22 above, characterized in that the device (21 0) upstream release of a liquid component (CL) comprises at least one injector (244) of liquid component (CL) which is intended to spray said liquid component in the form of droplets according to a spraying cone (230) forming the diffusion zone in which is arranged the upstream portion (228) of the plate (224).
24. Agencement selon l'une des revendications 13 à 23, caractérisé en ce que le dispositif (21 0) amont de libération d'un composant liquide (CL) comporte au moins un dispositif (246) de goutte à goutte de composant liquide qui est destiné à délivrer du composant liquide (CL) sous forme de gouttes au droit d'une zone (230) de diffusion dans laquelle est agencée la partie amont (228) de la plaque (224). 24. Arrangement according to one of claims 13 to 23, characterized in that the device (21 0) upstream release of a liquid component (CL) comprises at least one device (246) of drip of liquid component which is intended to deliver the liquid component (CL) in the form of drops to the right of a zone (230) of diffusion in which is arranged the upstream portion (228) of the plate (224).
25. Agencement selon l'une des revendications 13 à 24 , caractérisé en ce que le conduit (222) comporte une pluralité de plaques (224) qui sont fixées au porte plaque (248), qui sont décalées verticalement unes par rapport aux autres et qui se chevauchent au moins en partie deux à deux axialement, pour permettre au composant liquide (CL) de s'évaporer en tombant successivement d'une plaque (224) sur l'autre. 25. Arrangement according to one of claims 13 to 24, characterized in that the conduit (222) comprises a plurality of plates (224) which are fixed to the plate holder (248), which are offset vertically with respect to each other and which overlap at least in part two by two axially, to allow the liquid component (CL) to evaporate by falling successively from one plate (224) to the other.
PCT/FR2007/051741 2006-09-21 2007-07-27 Arrangement for the pollution control of a motor vehicle internal combustion engine WO2008034981A1 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
FR0653858A FR2906303B1 (en) 2006-09-21 2006-09-21 ARRANGEMENT FOR THE DEPOLLUTION OF A THERMAL MOTOR OF A MOTOR VEHICLE PROVIDED WITH A RECOVERED PLATE OF EVAPORATION
FR0653859A FR2906304B1 (en) 2006-09-21 2006-09-21 ARRANGEMENT FOR THE DEPOLLUTION OF A THERMAL MOTOR OF A MOTOR VEHICLE HAVING AN EVAPORATING PLATE PLATE
FR0653860A FR2906305B1 (en) 2006-09-21 2006-09-21 ARRANGEMENT FOR THE DEPOLLUTION OF A THERMAL MOTOR OF A MOTOR VEHICLE HAVING A PLATE HOLDER
FR0653860 2006-09-21
FR0653858 2006-09-21
FR0653859 2006-09-21

Publications (1)

Publication Number Publication Date
WO2008034981A1 true WO2008034981A1 (en) 2008-03-27

Family

ID=38819966

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR2007/051741 WO2008034981A1 (en) 2006-09-21 2007-07-27 Arrangement for the pollution control of a motor vehicle internal combustion engine

Country Status (1)

Country Link
WO (1) WO2008034981A1 (en)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008028627A1 (en) * 2008-04-21 2009-10-22 Heinrich Gillet Gmbh mixing element
WO2011045347A1 (en) * 2009-10-16 2011-04-21 Swenox Ab Mixing apparatus for mixing an exhaust gas with a liquid
FR2953558A1 (en) * 2009-12-04 2011-06-10 Bosch Gmbh Robert DEVICE FOR PREPARING A MIXTURE IN THE EXHAUST GAS PIPES OF A THERMAL ENGINE
DE102011018569A1 (en) * 2011-04-26 2012-10-31 Audi Ag Exhaust system for use in combustion engine of motor car, has metering valve injecting reducing agent in passage portion arranged in baffle unit, where baffle unit comprises impact surfaces that are bent in main flow direction of gas stream
WO2013010700A1 (en) * 2011-07-21 2013-01-24 Friedrich Boysen Gmbh & Co. Kg Arrangement for introducing an additive into a gas flow
DE102008042536B4 (en) * 2007-10-02 2013-07-04 Toyota Jidosha Kabushiki Kaisha Additive agent diffusion plate assembly in an exhaust passage
WO2014025538A1 (en) * 2012-08-10 2014-02-13 Tenneco Automotive Operating Company Inc. Method for mixing an exhaust gas flow
FR3004755A1 (en) * 2013-04-23 2014-10-24 Peugeot Citroen Automobiles Sa MIXER DEVICE, SYSTEM AND METHOD FOR DECOMPOSING A UREA SOLUTION IN SUCH A MIXER DEVICE
US8939638B2 (en) 2008-04-21 2015-01-27 Tenneco Automotive Operating Company Inc. Method for mixing an exhaust gas flow
WO2015053683A1 (en) * 2013-10-07 2015-04-16 Scania Cv Ab Arrangement for introducing a liquid medium in exhaust gases from an internal combustion engine
US9095827B2 (en) 2008-04-21 2015-08-04 Tenneco Automotive Operating Company Inc. Exhaust gas flow mixer
US9341097B2 (en) 2013-03-15 2016-05-17 Cummins Inc. Reductant material deposit reduction in exhaust aftertreatment systems
EP2980379B1 (en) 2014-07-31 2016-10-05 Eberspächer Exhaust Technology GmbH & Co. KG Injection device and method of manufacturing the same
US9534525B2 (en) 2015-05-27 2017-01-03 Tenneco Automotive Operating Company Inc. Mixer assembly for exhaust aftertreatment system
US9657624B2 (en) 2007-07-24 2017-05-23 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
US20170175061A1 (en) * 2014-03-04 2017-06-22 Reliance Industries Limited An apparatus for mixing multiphase flowing particles, and a method thereof
US9714598B2 (en) 2015-04-30 2017-07-25 Faurecia Emissions Control Technologies, Usa, Llc Mixer with integrated doser cone
US9719397B2 (en) 2015-04-30 2017-08-01 Faurecia Emissions Control Technologies Usa, Llc Mixer with integrated doser cone
US9726064B2 (en) 2015-04-30 2017-08-08 Faurecia Emissions Control Technologies, Usa, Llc Mixer for use in a vehicle exhaust system
US9828897B2 (en) 2015-04-30 2017-11-28 Faurecia Emissions Control Technologies Usa, Llc Mixer for a vehicle exhaust system
US10227907B2 (en) 2014-06-03 2019-03-12 Faurecia Emissions Control Technologies, Usa, Llc Mixer and doser cone assembly
JP2019157826A (en) * 2018-03-16 2019-09-19 いすゞ自動車株式会社 Exhaust emission control device of internal combustion engine and pipe member applied to the device
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 (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0615726U (en) * 1992-07-28 1994-03-01 株式会社タクマ Reductant supply device for catalytic denitration equipment
JPH11166410A (en) * 1997-12-04 1999-06-22 Hino Motors Ltd Exhaust emission control device
DE19806265C1 (en) * 1998-02-16 1999-07-22 Siemens Ag Low-maintenance system dosing urea solution into exhaust or effluent gases, for selective catalytic reduction
US6074619A (en) * 1997-03-13 2000-06-13 Haldor Topsoe A/S Process for selective reduction of NOx in exhaust gas
EP1022048A1 (en) * 1999-01-21 2000-07-26 Man Nutzfahrzeuge Ag Process and device for metering a reducing agent
EP1054139A1 (en) * 1999-05-19 2000-11-22 DaimlerChrysler AG Exhaust gas purification arrangement with NOx reduction and addition of reduction agent
WO2003004839A1 (en) * 2001-06-30 2003-01-16 Robert Bosch Gmbh Mixing device for an exhaust gas purification system
WO2005073524A1 (en) * 2004-01-30 2005-08-11 Robert Bosch Gmbh Method and device for post treating waste gas of an internal combustion engine
US20060016176A1 (en) * 2004-07-23 2006-01-26 Hilden David L Diesel exhaust aftertreatment device regeneration system
EP1748162A1 (en) * 2005-07-28 2007-01-31 Hitachi, Ltd. Exhaust aftertreatment system using urea water

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0615726U (en) * 1992-07-28 1994-03-01 株式会社タクマ Reductant supply device for catalytic denitration equipment
US6074619A (en) * 1997-03-13 2000-06-13 Haldor Topsoe A/S Process for selective reduction of NOx in exhaust gas
JPH11166410A (en) * 1997-12-04 1999-06-22 Hino Motors Ltd Exhaust emission control device
DE19806265C1 (en) * 1998-02-16 1999-07-22 Siemens Ag Low-maintenance system dosing urea solution into exhaust or effluent gases, for selective catalytic reduction
EP1022048A1 (en) * 1999-01-21 2000-07-26 Man Nutzfahrzeuge Ag Process and device for metering a reducing agent
EP1054139A1 (en) * 1999-05-19 2000-11-22 DaimlerChrysler AG Exhaust gas purification arrangement with NOx reduction and addition of reduction agent
WO2003004839A1 (en) * 2001-06-30 2003-01-16 Robert Bosch Gmbh Mixing device for an exhaust gas purification system
WO2005073524A1 (en) * 2004-01-30 2005-08-11 Robert Bosch Gmbh Method and device for post treating waste gas of an internal combustion engine
US20060016176A1 (en) * 2004-07-23 2006-01-26 Hilden David L Diesel exhaust aftertreatment device regeneration system
EP1748162A1 (en) * 2005-07-28 2007-01-31 Hitachi, Ltd. Exhaust aftertreatment system using urea water

Cited By (33)

* 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
US9657624B2 (en) 2007-07-24 2017-05-23 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
DE102008042536B4 (en) * 2007-10-02 2013-07-04 Toyota Jidosha Kabushiki Kaisha Additive agent diffusion plate assembly in an exhaust passage
US9975093B2 (en) 2008-04-21 2018-05-22 Tenneco Automotive Operation Company Inc. Exhaust gas flow mixer
DE102008028627A1 (en) * 2008-04-21 2009-10-22 Heinrich Gillet Gmbh mixing element
US8939638B2 (en) 2008-04-21 2015-01-27 Tenneco Automotive Operating Company Inc. Method for mixing an exhaust gas flow
US9095827B2 (en) 2008-04-21 2015-08-04 Tenneco Automotive Operating Company Inc. Exhaust gas flow mixer
US9440204B2 (en) 2008-04-21 2016-09-13 Tenneco Automotive Operating Company Inc. Method for mixing an exhaust gas flow
EP2314837A1 (en) * 2009-10-16 2011-04-27 Swenox AB Mixing apparatus for mixing an exhaust gas with a liquid
WO2011045347A1 (en) * 2009-10-16 2011-04-21 Swenox Ab Mixing apparatus for mixing an exhaust gas with a liquid
FR2953558A1 (en) * 2009-12-04 2011-06-10 Bosch Gmbh Robert DEVICE FOR PREPARING A MIXTURE IN THE EXHAUST GAS PIPES OF A THERMAL ENGINE
DE102011018569A1 (en) * 2011-04-26 2012-10-31 Audi Ag Exhaust system for use in combustion engine of motor car, has metering valve injecting reducing agent in passage portion arranged in baffle unit, where baffle unit comprises impact surfaces that are bent in main flow direction of gas stream
WO2013010700A1 (en) * 2011-07-21 2013-01-24 Friedrich Boysen Gmbh & Co. Kg Arrangement for introducing an additive into a gas flow
WO2014025538A1 (en) * 2012-08-10 2014-02-13 Tenneco Automotive Operating Company Inc. Method for mixing an exhaust gas flow
US9341097B2 (en) 2013-03-15 2016-05-17 Cummins Inc. Reductant material deposit reduction in exhaust aftertreatment systems
FR3004755A1 (en) * 2013-04-23 2014-10-24 Peugeot Citroen Automobiles Sa MIXER DEVICE, SYSTEM AND METHOD FOR DECOMPOSING A UREA SOLUTION IN SUCH A MIXER DEVICE
EP2796684A1 (en) * 2013-04-23 2014-10-29 Peugeot Citroën Automobiles Sa Mixing device, system and method for decomposing an urea solution in such a mixing device
WO2015053683A1 (en) * 2013-10-07 2015-04-16 Scania Cv Ab Arrangement for introducing a liquid medium in exhaust gases from an internal combustion engine
US20170175061A1 (en) * 2014-03-04 2017-06-22 Reliance Industries Limited An apparatus for mixing multiphase flowing particles, and a method thereof
US10570358B2 (en) * 2014-03-04 2020-02-25 Reliance Industries Limited Apparatus with a flow diverter and flow elements for mixing multiphase flowing particles, and a method thereof
US10294843B2 (en) 2014-06-03 2019-05-21 Faurecia Emissions Control Technologies, Usa, Llc Mixer and doser cone assembly
US10227907B2 (en) 2014-06-03 2019-03-12 Faurecia Emissions Control Technologies, Usa, Llc Mixer and doser cone assembly
US10167761B2 (en) 2014-07-31 2019-01-01 Eberspächer Exhaust Technology Gmbh & Co.Kg Injection device and corresponding method for manufacturing same
EP2980379B1 (en) 2014-07-31 2016-10-05 Eberspächer Exhaust Technology GmbH & Co. KG Injection device and method of manufacturing the same
DE102014215084C5 (en) 2014-07-31 2023-10-05 Purem GmbH Injection device and associated manufacturing process
US9714598B2 (en) 2015-04-30 2017-07-25 Faurecia Emissions Control Technologies, Usa, Llc Mixer with integrated doser cone
US9828897B2 (en) 2015-04-30 2017-11-28 Faurecia Emissions Control Technologies Usa, Llc Mixer for a vehicle exhaust system
US9726064B2 (en) 2015-04-30 2017-08-08 Faurecia Emissions Control Technologies, Usa, Llc Mixer for use in a vehicle exhaust system
US9719397B2 (en) 2015-04-30 2017-08-01 Faurecia Emissions Control Technologies Usa, Llc Mixer with integrated doser cone
US9534525B2 (en) 2015-05-27 2017-01-03 Tenneco Automotive Operating Company Inc. Mixer assembly for exhaust aftertreatment system
US10933387B2 (en) 2016-10-21 2021-03-02 Faurecia Emissions Control Technologies, Usa, Llc Reducing agent mixer
JP2019157826A (en) * 2018-03-16 2019-09-19 いすゞ自動車株式会社 Exhaust emission control device of internal combustion engine and pipe member applied to the device
US10787946B2 (en) 2018-09-19 2020-09-29 Faurecia Emissions Control Technologies, Usa, Llc Heated dosing mixer

Similar Documents

Publication Publication Date Title
WO2008034981A1 (en) Arrangement for the pollution control of a motor vehicle internal combustion engine
WO2002090831A1 (en) Device and method for injecting a liquid fuel in an air flow for a combustion chamber
FR2921463A1 (en) COMBUSTION CHAMBER OF A TURBOMACHINE
FR2634005A1 (en) PILOTAGE FUEL INJECTOR ASSEMBLY FOR A SUPERSONIC STATOREACTOR
FR2935465A1 (en) Combustion chamber for gas turbine engine, has casing that is in support on upstream face of chamber bottom wall, where casing carries deflector support constituting stop arranged in manner to maintain deflector in contact with wall
FR2971039A1 (en) GAS TURBINE FUEL COMBUSTION CHAMBER INJECTOR WITH DOUBLE FUEL CIRCUIT AND COMBUSTION CHAMBER EQUIPPED WITH AT LEAST ONE SUCH INJECTOR
CA2638793A1 (en) Turbine engine with diffuser
FR2833035A1 (en) Gas turbine engine distributor blade platform has inner surface with thermal barrier coating adjacent to blade's trailing edge
EP1881180B1 (en) System for ventilating a wall of a combustion chamber
FR2921415A1 (en) Liquid i.e. fuel, and exhaust gas mixer for heat engine of motor vehicle, has blades distributed around full central zone, and extended from central zone, where each blade is integrated with cylindrical peripheral rim
EP3430316B1 (en) Combustion chamber of a turbine, particularly a turbine with a thermodynamic cycle comprising a recuperator, for producing energy, particularly electrical energy
WO2011117543A1 (en) Turbomachine combustion chamber having a centrifugal compressor with no deflector
FR2906305A1 (en) Heat engine depollution arrangement for motor vehicle, has lower evaporation device with pipe in which plate is arranged, and plate holder maintained by junction ring placed between lower end of another pipe and upper end of former pipe
EP3504481B1 (en) Combustion chamber with a hot compressed air deflector, in particular for a turbine intended for producing energy, in particular electrical energy
EP2076659A1 (en) Exhaust line fitted with a fuel injector and means for homogenizing burnt gases
FR2958373A1 (en) Combustion chamber for turbine engine e.g. turbo propeller, of airplane, has air passage openings inclined with respect to axis of chimney in axial direction and circumferential direction so as to form local stream of air on specific level
EP3447271B1 (en) Heating system for convergent-divergent secondary nozzle
EP1751477A1 (en) Heat exchange and heat transfer device, in particular for a motor vehicle
WO2007125230A1 (en) Device for injecting a reducing agent into an exhaust pipe
FR2996287A1 (en) Multipoint fuel injection device for annular combustion chamber of e.g. turbojet, of airplane, has venturi including internal cavity supplied with air and communicating with air passage orifices leading to radial inner wall of venturi
FR3119865A1 (en) Heating component and exhaust line comprising such a component
FR2906303A1 (en) Heat engine pollution controlling arrangement for motor vehicle, has reduced thickness plate with upstream part mixing liquid component with exhaust gas, and with downstream part provoking rotational flow of mixing of gas and component
WO2008034982A1 (en) Arrangement for the pollution control of an internal combustion engine comprising a conduit provided with a projecting element
EP3830486A1 (en) Combustion chamber comprising a passage section of a flame tube, which is modified, particularly for a turbine designed to generate power, particularly electrical power
FR2880824A1 (en) Liquid e.g. water, collecting device for separating liquid and gaseous phases of diphasic fluid, has inner partition contacting inner cooling installation that provokes heat exchange with fluid across inner or outer sides of partition

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07823656

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 07823656

Country of ref document: EP

Kind code of ref document: A1