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
  • B01F23/20—Mixing gases with liquids
  • B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
  • B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
  • B01F23/2132—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
• • 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
  • B01F25/40—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
• • 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
  • B01F25/4317—Profiled elements, e.g. profiled blades, bars, pillars, columns or chevrons
• • 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
  • B01F25/431971—Mounted on the wall
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
  • F01N13/08—Other arrangements or adaptations of exhaust conduits
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
  • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
  • F01N13/1861—Construction facilitating manufacture, assembly, or disassembly the assembly using parts formed by casting or moulding
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
  • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
  • F02B67/10—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of charging or scavenging apparatus
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
  • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
  • 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
  • F01N2470/00—Structure or shape of gas passages, pipes or tubes
  • F01N2470/28—Tubes being formed by moulding or casting x
• • 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
  • F01N2510/00—Surface coverings
• • 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
  • F01N3/033—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 in combination with other devices
  • F01N3/035—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 in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters

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 catalyst and a particle filtering element contained in the exhaust gas of said engine, of the type which comprises at least one fuel injection device, arranged in a determined duct of the exhaust line upstream of the filter element of the particles, comprising an injector which is intended to produce a mixture of fuel and exhaust gas in the duct intended to be ignited in the particle filtering element in order to cause in said filtering element a rise in temperature which makes it possible to suppress the particles contained in said filter element.
• the fuel injected by the fuel injection device is injected into a determined conduit whose inner walls are generally smooth. This results in poor vaporization of the fuel, which tends to accumulate in liquid form on the internal walls of the duct without evaporating completely. Therefore, it is necessary to inject large amounts of fuel to achieve a mixture containing sufficient fuel to be able to raise sufficiently the temperature within the particulate filter element.
• This design is particularly penalizing, both in terms of fuel consumption and pollution from the environment, the non-vaporized liquid fuel is then rejected by the vehicle exhaust without being ignited.
• the invention overcomes this disadvantage by proposing an arrangement comprising means for improving the vaporization of the injected fuel.
• the invention proposes an arrangement of the type described above, characterized in that the conduit has on its inner wall a protruding element arranged substantially facing the injector, which is intended to promote the vaporization of the fuel in the mixture by increasing the exchange surface between the exhaust gas and fuel on the inner wall of the duct and creating turbulence in the flow of the mixture.
• the projecting element is arranged in a zone of the internal wall of the duct delimited by a spray cone of the injector
• the projecting element consists of at least one rib
• the projecting element comprises a plurality of ribs; the ribs are arranged according to a propeller profile whose diameter corresponds to the internal diameter of the duct;
• the duct is made by a foundry process and the protruding element is molded with the duct, - the duct is made of cast iron.
• the duct is an angled outlet duct of a radiocompressor equipping the vehicle.
• FIG. 1 is a diagrammatic view of an arrangement according to the invention
• - Figure 2 is a perspective view of an arrangement according to the invention adapted to a curved outlet duct of a turbocharger.
• FIG. 1 a portion of an arrangement 10 for the pollution of a motor vehicle engine.
• the arrangement 10 comprises at least one exhaust line, arranged downstream of a vehicle engine (not shown), which comprises at least one catalyst and a filter element of the particles contained in the exhaust gases. exhaust of said engine (not shown).
• the arrangement 10 which comprises at least one fuel injection device 12, in particular an injector 12, a nose 14 of which opens into a duct 16 determined from the exhaust line upstream of the particle filtering element.
• the duct 16 comprises an upstream end 18 which is connected for example to an exhaust manifold of the engine, and a downstream end 20 which is connected to a particle filter element inlet (not shown).
• the injector 12 is intended to produce in the conduit 16 determined a mixture of fuel and exhaust gas which is intended to be ignited in the particle filtering element to cause in said filter element a temperature rise allowing remove the particles contained in said filter element.
• the conduit 16 determined has on its inner wall 22 a projecting element 24, arranged substantially facing the injector 12, which is intended to promote the vaporization of the fuel in the mixture. increasing the exchange surface between the liquid fuel and the exhaust gas on the inner wall 22 of the duct.
• the protruding element 24 also makes it possible to create turbulence in the flow of the mixture, which promotes mixing of the liquid fuel in the exhaust gas, and consequently promotes the vaporization of the fuel in the exhaust gas. .
• the projecting element 24 is arranged in an area 26 of the inner wall of the duct which is delimited by a cone 28 of " ⁇ " angle of spray of the injector 12.
• This configuration makes it possible to limit the zone 26 to the strict zone necessary for the mixing of the fuel coming from the injector 12 and the exhaust gases, without unduly disturbing the gas flow at any other point in the determined duct. .
• the projecting element 24 consists of at least one rib 26.
• Each rib 26 makes it possible to increase the exchange surfaces between the internal wall 22 of the pipe 16 determined and the liquid fuel, which is then vaporized because of the high temperature to which the pipe 16 is subjected.
• the efficiency of the arrangement 10 will be increased as the element 24 projecting comprises a plurality of ribs 26.
• the ribs 26 are arranged in a helix profile whose diameter corresponds to to the internal diameter of the duct 16. This configuration is designed to promote a vaporization as complete as possible of the liquid fuel droplets that are received on the ribs 26 of the duct 1 6.
• the ribs 26 in a helix make it possible to encourage a drive of the liquid fuel by the exhaust gases along the spiral profile of the grooves, preventing it from stagnating, which inevitably leads to its vaporization as it progresses. extends along the helix profile of the ribs 26.
• the protruding element 24 is integral with the conduit 1 6. This configuration ensures optimum heat transfer from the conduit 1 6 to the ribs 26.
• the conduit 1 6 is made by a casting process and the element 24 projecting is molded with the conduit 16. This configuration provides a conduit 1 6 of a reduced manufacturing cost.
• the duct 16 is made of cast iron, which has a high heat capacity, this allowing the conduit 1 6 to maintain a high temperature long after stopping the engine of the vehicle, to allow a new vaporization of the fuel from the injector 1 2 upon resumption of engine operation.
• Figure 2 illustrates an application of the arrangement 1 0 to a duct 28 bent output of a turbocharger fitted to the vehicle.
• the upstream end 1 8 of the duct is constituted by a first fastening flange of the duct of the turbocharger 28 and the downstream end 20 of the duct is constituted by a second flange for fastening the duct of the turbocompressor 28.
• the projecting element 24 comprises a plurality of ribs 26 which are arranged in a bend 30 of the conduit 28 of the turbocharger, to the right of a bore 32 for receiving an injector (not shown).
• the ribs 26 are arranged partially in a theoretical helix profile, that is to say that they follow the helix profile and do not extend over the entire periphery of the inner wall of the bend 30 of the duct.
• the invention thus makes it possible to substantially improve the regeneration performance of a particulate filter element by means of reduced fuel injection.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=38038916

Family Applications (1)

Country Status (3)

Families Citing this family (3)

Family Cites Families (2)

• 2006
  • 2006-09-21 FR FR0653861A patent/FR2906306B1/fr active Active
• 2007
  • 2007-07-31 WO PCT/FR2007/051758 patent/WO2008034982A1/fr active Application Filing
  • 2007-07-31 EP EP07823670A patent/EP2064421A1/de not_active Withdrawn

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events