EP1438488B1 - Appareil de traitement des gaz - Google Patents

Appareil de traitement des gaz Download PDF

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Publication number
EP1438488B1
EP1438488B1 EP02801945A EP02801945A EP1438488B1 EP 1438488 B1 EP1438488 B1 EP 1438488B1 EP 02801945 A EP02801945 A EP 02801945A EP 02801945 A EP02801945 A EP 02801945A EP 1438488 B1 EP1438488 B1 EP 1438488B1
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EP
European Patent Office
Prior art keywords
gas
inlet
compartment
central compartment
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02801945A
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German (de)
English (en)
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EP1438488A1 (fr
Inventor
William Frederick Ball
John Anthony Gault
Charles Patrick Harrod
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Eminox Ltd
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Eminox Ltd
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Publication of EP1438488A1 publication Critical patent/EP1438488A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—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
    • 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
    • F01N13/009—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 having two or more separate purifying devices arranged in series
    • F01N13/0097—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 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • 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
    • F01N2470/18—Structure or shape of gas passages, pipes or tubes the axis of inlet or outlet tubes being other than the longitudinal axis of 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes
    • F01N2490/04—Two or more expansion chambers in series connected by means of tubes the gases flowing longitudinally from inlet to outlet only in one direction
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes
    • F01N2490/06—Two or more expansion chambers in series connected by means of tubes the gases flowing longitudinally from inlet to outlet in opposite directions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea

Definitions

  • the present invention relates to a gas treatment apparatus for treating an exhaust gas stream and is particularly intended for use in treating an exhaust gas stream from an internal combustion engine.
  • the invention is especially intended for use on a vehicle to treat the exhaust gas from the engine prior to release to the atmosphere and extends to a vehicle including such gas treatment apparatus.
  • Diesel engine exhaust gases contain a number of noxious gases, such a nitrogen oxides, sulphur oxides and carbon oxides, as well as un-burnt hydrocarbons, carbon and other particles.
  • the amount of sulphur oxides in the exhaust gases is dependent primarily upon the sulphur in the fuel and is controlled by the quality of the initial crude oil and the refining techniques used in the preparation of the fuel. However, the other materials can be treated so as to render them less obnoxious.
  • inlet and outlet ports from the apparatus are substantially radially directed rather than at least one of the inlet or outlet ports being axial.
  • An example of such apparatus is disclosed in GB 2 357 048. This occurs particularly with concentric treatment apparatus, in which gas flows one way through a central compartment, and through an annular compartment substantially surrounding the central compartment in an opposite direction.
  • the radial location of the inlet and outlet in such apparatus traditionally requires that the inlet and outlet be spaced apart axially and that a planar annular dividing wall separates the two gas streams. This may increase the overall axial dimension of the apparatus.
  • the invention provides a Gas treatment apparatus for treating an exhaust gas stream from an internal combustion engine, the apparatus comprising a housing, a plurality of compartments within said housing within which treatments are to be performed on a gas stream passing through said compartments, the apparatus including a central compartment having a central axis for gas flow in one direction and an annular compartment for gas flow in an opposite direction, the annular compartment substantially surrounding the central compartment in a generally concentric arrangement, the central compartment containing a first treatment element and the annular compartment containing an annular second treatment element, an inlet port and an outlet port both passing through the housing substantially radially and characterised in that the plan area of the inlet and outlet ports overlap axially, the inlet and outlet gas flows being separated, at least partially, by an annular wall substantially surrounding the central compartment and the annular wall being at an angle to the central axis of the central compartment such that the wall forms a substantially funnel shape.
  • the inlet and outlet ports will preferably be spaced circumferentially, which should not add significantly to the overall outer dimensions of the apparatus. It is possible that the inlet and outlet ports may be coincident and that the inlet and outlet may be substantially concentrically arranged, but for manufacturing ease it is currently preferred that the inlet and outlet ports are spaced circumferentially.
  • the overall axial length of the gas treatment apparatus can be reduced. This allows the apparatus to be located in smaller, more confined spaces than previously and therefore provides greater range of choices when locating the apparatus, particularly on a vehicle.
  • the amount of overlap between the ports may be anything between 0.1%-100%, 10%-90% and preferably at least 40% of the plan area of the inlet or outlet port is overlapping.
  • the apparatus has a radial inlet port 13 in a first terminal portion of a housing 3, referred to as a proximal terminal portion of the housing 3.
  • a central compartment 2 and an annular compartment 4 substantially surrounding the central compartment in a generally concentric arrangement are located within the housing 3.
  • the central compartment contains a filtration and an oxidation treatment element 6.
  • a distal end of the apparatus includes addition means 15 by which a reducing agent, for instance urea, may be added to the gas flow.
  • the annular compartment includes additional catalytic treatment elements 6, including a catalytic treatment element promoting the selective catalytic reduction of NO 2 by the reducing agent and a catalytic treatment element suitable for decomposing any remaining reducing agent to a less noxious compound.
  • the gas flow enters the apparatus through the inlet 10 at the proximal end and passes to the distal end of the central compartment. The gas flow is reversed as the gas is directed into the annular compartment 4 by an endcap 14 to flow toward the outlet 16 at the proximal end.
  • the inlet and outlet gas flows should not unintentionally come into contact with one another, and under normal circumstances the flows are preferably separated by a wall and/or one or more conduits for containing gas flow located within the annular compartment. Contact between the two gas streams may intentionally occur if a safety valve is included to allow inlet gas to pass directly from the inlet to the outlet in the event of a blockage within the apparatus.
  • the inlet and outlet gas flows are separated by a wall within the annular compartment that, possibly in combination with other components within the annular compartment, maintains separation between the inlet and outlet gas flows as this allows easier gas flow than, for instance a pipe.
  • the inlet and outlet gas flows are separated by a substantially annular wall located generally surrounding the central chamber.
  • This annular wall preferably extends from the wall of the central compartment to the housing forming an outer wall of the annular compartment. However, the annular wall may not extend fully across the annular compartment and may extend radially and/or axially. A portion of said wall may be substantially concentric with the central compartment.
  • This wall is preferably located such that gas flowing through the annular compartment may reach the outlet, but not pass through or around the wall to mix with the inlet gases. This allows the gas flow from the annular compartment to be easily kept separate from the inlet flow and directed to the outlet.
  • the annular wall is transverse to the axis of the central compartment and may be directed substantially radially and generally perpendicular to the axis of the central compartment, but will preferably then deviate in an axial direction as it passes round the central compartment. The deviation is to maintain separation of the inlet and outlet gas flows.
  • the wall preferably deviates across at least the axial distance of the overlap of the inlet and outlet ports to pass a distal side of the inlet port and the proximal side of the outlet port, or vice versa. This results in a non-planar annular wall.
  • Such an annular wall may be formed by stamping, pressing or other suitable process.
  • the annular wall may be angled to deflect the gas flow from the annular compartment radially outwards and towards the outlet.
  • the annular wall may therefore preferably form a cone or funnel shape narrowing towards the distal end of the annular compartment.
  • This funnel shaped annular wall may extend axially across the plan area of the inlet port and therefore prevent gas from the inlet from reaching the central compartment. If this is the case a conduit may carry gas from the inlet to an aperture through the annular wall such that the gas from the inlet may enter the central compartment.
  • the annular wall may be permanently attached within the apparatus.
  • the annular wall may be formed integrally with the wall of the central compartment or annular compartment by rolling or folding, but preferably the annular wall is attached within the apparatus by crimping, riveting, or welding, brazing, soldering or similar process involving molten material.
  • the heat required for such hot processes may be sufficient to warp or deform the wall of the central compartment or any adjacent treatment element located within the central compartment.
  • the central compartment therefore preferably has a radially outwardly directed deformation at and around the location at which the attachment of the annular wall is to be made. This deformation allows slight warping of the compartment wall and creates a space between the wall and a treatment element such that the treatment element will remain undamaged by the heat or deformation of the central compartment.
  • the annular wall may be locally deformed in regions at or adjacent to the inlet or outlet to form 'blisters' so as to aid gas flow.
  • the distance from the inlet port of the apparatus to the surface upon which the gas flow impinges should be greater than about 0.25 diameters of the apparatus and preferably about 0.5 diameters of the apparatus. Thus it can be understood that a blister helps to achieve this desirable distance.
  • a terminal portion of the central compartment may be permanently attached to an end of the apparatus.
  • the central compartment may then include apertures through which gas may enter or leave the central compartment.
  • the central compartment is attached to an endcap at the proximal end of the apparatus and the apertures are preferably formed by extensions from the central compartment that are attached to the endcap.
  • End portions of the extensions may be permanently attached to the endcap.
  • the extensions may take any appropriate form, for instance substantially rectangular, trapezoidal or may include a narrow waist to increase the area for gas flow. End portions of the extensions may be attached into slots in the endcap and may include a shoulder portion to aid the correct positioning of the extensions within the slots.
  • the extensions may also be attached to the endcap in other ways, for instance flanged or welded to the endcap.
  • the extensions may be flared in a radially outward direction to increase the area for flow through the slots. Attaching the central compartment to the endcap will also help to support the central compartment within the apparatus.
  • the apertures into the central compartment formed by the extensions may be of different sizes around the periphery of the central compartment to evenly distribute the gas flow entering the central compartment.
  • the edges of the apertures may be flanged inwards or the edges of the apertures bent or curved over to provide a smooth edge over which gas may flow. These measures may increase effective flow area through the apertures whilst increasing or maintaining the strength of the extensions from the central compartment.
  • Providing a baffle at the entry to the central compartment may cause the gas to flow within the annular compartment around the periphery of the central compartment before entering said central compartment. Since the gas flow is entering the apparatus through a single localised inlet it is possible that the gas entering the central compartment may be unevenly distributed. By causing some of the inlet gas to pass around the central compartment by including a baffle a more even distribution of the gas across the entry to an initial treatment element within the central compartment may be achieved.
  • the gas may first flow through the annular compartment and then the central compartment.
  • the gas may be caused to flow through each compartment in turn until an outlet port is reached.
  • the position of the treatment elements within the apparatus may vary, different treatment elements may be used or treatment elements not included or included several times.
  • Apparatus according to the invention may also be appropriate for treating gas streams not emitted from an internal combustion engine, for example a flue gas from a chemical process or other emitted gas stream.
  • Figure 1 shows a gas treatment apparatus 1 having a housing 3 within which there is located a central compartment 2 and an annular compartment 4 substantially surrounding the central compartment 2 in a generally concentric arrangement. Within the compartments 2,4 are located treatment elements 6 for treating a gas stream passing through said elements 6.
  • Arrows 8 indicate the flow path of the gas.
  • the gas enters the apparatus 1 through an inlet 10 near a first end 9 of the apparatus 1, the gas passing through the inlet port 13 to enter the apparatus 1.
  • the gas then passes into the central compartment 2 through a chamber 12.
  • the gas passes along the length of the apparatus 1 and reaches an endcap 14, which directs the gas flow into the annular compartment 4.
  • annular wall 18 extends substantially radially from the central compartment 2 to the outside of the annular compartment 4 formed by the housing 3 and prevents gas from passing. In this case the annular wall 18 extends radially substantially perpendicular to the central compartment 4.
  • the plan area of the inlet port 13 and the plan area of the outlet port 19 overlap 20 in the axial direction.
  • the annular wall 18 extends from one side of the overlap to the other to keep the gas flows separate. Since the inlet 10 and outlet 16 overlap the edge 11 of the inlet and the edge 17 of the outlet are the points of greatest overlap.
  • the inlet and outlet ports 13,19 are shown circumferentially spaced apart by about 180°. It should be understood that the ports 13,19 may be circumferentially spaced apart by any appropriate angle between about 1°-180°. Preferably the ports 13,19 are spaced apart between than about 10°-90° to facilitate the connection of conduits to the inlet and outlet ports.
  • the annular wall may therefore be formed from a planar ring shape, which is formed by pressing or stamping to create the desired shape.
  • the wall 18 extends in the axial direction at least from the edges 11,17 of the inlet 10 and outlet 17 to ensure separation of the flows.
  • Figure 2 shows a different annular wall 118.
  • the wall 118 is substantially planar and is mounted within the annular compartment 4 at an angle to the central compartment 2.
  • the wall 118 extends in the axial direction from the edge 11 of the inlet 10 to the edge 17 of the outlet 16.
  • Figure 3 shows a further annular wall 218.
  • the wall 218 is in the form of a funnel or cone narrowing across the annular compartment 4 with distance away from end 9.
  • the wall begins at the end 9 at the outside of the annular compartment and narrows as it extends axially to beyond the end 11 of the inlet 10.
  • a conduit 30 extends from the inlet 10 to the wall 218. Gas from the inlet passes through the conduit 30 and passes through an aperture 32 in the wall 218. This allows the gas from the inlet 10 to enter the central compartment 2.
  • the wall 218 is substantially rotationally symmetrical except for the conduit 30 and aperture 32 near the inlet 10 location. This allows for a greater degree of flexibility for this design enabling the same wall 218 to be used for different circumferential locations of the inlet port 13 and outlet port 19.
  • Figure 4 shows a further annular wall 318.
  • This embodiment 318 is very similar to the embodiment 218 except that the conduit 130 is flared rather than substantially linear and forms a blister on the wall 318.
  • This flared conduit 130 and blister facilitate gas flow as gas enters the apparatus 1. By facilitating gas flow the pressure drop across the apparatus, and hence the back pressure to the engine (not shown) can be reduced.
  • Figure 5 shows a further annular wall 418.
  • the wall 418 is curved and extends from the final treatment element in the annular compartment 4.
  • the wall 418 curves from the central compartment across the annular compartment 4.
  • the wall is not rotationally symmetrical, and near the inlet 10 the wall 418 only extends to the edge 11 of the inlet 10 and near the outlet the wall extends past the edge 17 of the outlet 16.
  • Figure 6 shows a radial outward deformation 40 on the wall of the central compartment 2 at the location where the annular wall 218 is joined to the central compartment 2.
  • the gap 42 can help to accommodate any warping of the central cylinder around the attachment location and still permit a treatment element to be located within the central compartment. If there is a treatment element 6 within the central compartment it is separated from the heat of the attachment process by a gap 42 and this helps to prevent warping of the element 6.
  • Figure 7 shows an end of the central compartment 2 and the endcap 9 of the apparatus 1. Within the central compartment an end portion of a treatment element 6 can be seen.
  • Extensions 50 from the end of the central compartment take the form of rectangular projections in a square tooth arrangement.
  • the extensions 50 are to fit within slots 52 in the endcap 9 and are to be welded in place.
  • the gaps 54 between the extensions 50 form the apertures through which gas flow may enter the central compartment 2.
  • the flow restriction caused by the extensions 50 may cause the inlet gas to pass around the central compartment prior to entering and therefore encourage better gas distribution over the treatment element 6.
  • Figure 8 shows different extensions 150 to the extensions 50 of Figure 7.
  • the extensions 150 and the apertures 154 are curved such that the extensions 150 have a waist 64.
  • the extensions also include a shoulder portion 60 and protrusion 62, which is for engagement with the slots 52 in the endcap.
  • the shoulder 60 aid in the correct location of the protrusion 62, and hence the extensions 154, with respect to the endcap 9.
  • the extensions 150 have a flanged edge 66 directed radially inwards which provides added strength to the extension and helps to reduce gas flow losses as gas passes through the aperture 154.
  • Figure 9 shows a further annular wall 518.
  • the annular wall 518 has only a short radial extent 70 and has a cylindrical portion 72 arranged in a generally concentric arrangement with the central compartment 2.
  • a conduit 74 provides access for the inlet gas to the central compartment 2 through an aperture in the annular wall 518.
  • Permitting the inlet and outlet to overlap in the axial direction allows the axial extent of the apparatus 1 to be reduced. This allows the apparatus to be fitted into smaller spaces and occupy less room than hitherto possible. This may be particularly important for applications in vehicles where the apparatus is required to treat the exhaust gases so that the vehicle emissions are within permitted ranges.

Claims (10)

  1. Dispositif de traitement des gaz (1) pour le traitement d'un flux de gaz d'échappement provenant d'un moteur à combustion interne, le dispositif comprenant un boítier (3), plusieurs compartiments (2, 4) à l'intérieur dudit boítier (3) à l'intérieur desquels des traitements doivent être effectués sur un flux gazeux passant par lesdits compartiments, le dispositif comprenant un compartiment central (2) ayant un axe central pour un écoulement de gaz dans un sens et un compartiment annulaire (4) pour un écoulement de gaz dans un sens opposé, le compartiment annulaire (4) entourant sensiblement le compartiment central (2) selon un agencement globalement concentrique, le compartiment central (2) contenant un premier élément (6) de traitement et le compartiment annulaire contenant un second élément annulaire de traitement (6), un orifice d'entrée (13) et un orifice de sortie (19) passant tous deux à travers le boítier (3) de manière sensiblement radiale, et caractérisé en ce que les sections en plan des orifices d'entrée et de sortie (13, 19) se chevauchent de manière axiale, les écoulements de gaz d'entrée et de sortie étant séparés, au moins en partie, par une paroi annulaire (18) entourant sensiblement le compartiment central, et la paroi annulaire étant orientée suivant un certain angle par rapport à l'axe central du compartiment central de sorte que la paroi ait sensiblement la forme d'un entonnoir.
  2. Dispositif de traitement des gaz selon la revendication 1, dans lequel la paroi annulaire (18) s'étend dans la direction axiale de sorte qu'au moins une partie de la paroi annulaire se trouve d'un côté de l'orifice d'entrée (13) et que l'autre partie de la paroi se trouve d'un côté opposé de l'orifice de sortie (19).
  3. Dispositif de traitement des gaz selon la revendication 1 ou la revendication 2, dans lequel la paroi annulaire (18) est fixée à la paroi du compartiment central (2) et la paroi du compartiment intérieur est déformée de manière radiale vers l'extérieur dans la zone se trouvant au niveau et au voisinage immédiat de la fixation.
  4. Dispositif de traitement des gaz selon l'une quelconque des revendications 1 à 3, dans lequel la paroi annulaire (18) est déformée localement dans la zone se trouvant à proximité de l'orifice d'entrée ou de l'orifice de sortie.
  5. Dispositif de traitement des gaz selon l'une quelconque des revendications 1 à 4, dans lequel une conduite (30) amène le gaz de l'orifice d'entrée jusqu'à une ouverture (32) pratiquée dans la paroi annulaire (218).
  6. Dispositif de traitement des gaz selon l'une quelconque des revendications précédentes, dans lequel la paroi du compartiment central (2) comprend des ouvertures (54) à travers lesquelles un flux de gaz d'entrée doit passer pour pénétrer dans le compartiment central (2).
  7. Dispositif de traitement des gaz selon la revendication 6, dans lequel le compartiment central (2) est fixé à un bouchon d'extrémité (9) à l'extrémité d'entrée/de sortie du dispositif.
  8. Dispositif de traitement des gaz selon la revendication 7, dans lequel les ouvertures (54) donnant sur le compartiment central sont formées par des prolongements (50) partant du compartiment central (2) qui sont fixés au bouchon d'extrémité (9).
  9. Dispositif de traitement des gaz selon la revendication 8, dans lequel les prolongements (50) comprennent une partie formant épaulement (60) située à proximité d'une extrémité.
  10. Véhicule comprenant le dispositif de traitement des gaz selon l'une quelconque des revendications précédentes.
EP02801945A 2001-10-25 2002-10-21 Appareil de traitement des gaz Expired - Lifetime EP1438488B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0125575A GB2381220B (en) 2001-10-25 2001-10-25 Gas treatment apparatus
GB0125575 2001-10-25
PCT/GB2002/004719 WO2003036052A1 (fr) 2001-10-25 2002-10-21 Appareil de traitement des gaz

Publications (2)

Publication Number Publication Date
EP1438488A1 EP1438488A1 (fr) 2004-07-21
EP1438488B1 true EP1438488B1 (fr) 2005-04-20

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ID=9924473

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EP02801945A Expired - Lifetime EP1438488B1 (fr) 2001-10-25 2002-10-21 Appareil de traitement des gaz

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Country Link
EP (1) EP1438488B1 (fr)
AT (1) ATE293748T1 (fr)
DE (1) DE60203817T2 (fr)
GB (1) GB2381220B (fr)
WO (1) WO2003036052A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008255858A (ja) 2007-04-03 2008-10-23 Yanmar Co Ltd ディーゼルエンジン用黒煙浄化装置
JP4963304B2 (ja) * 2008-09-19 2012-06-27 ヤンマー株式会社 排気ガス浄化装置
JP5288055B1 (ja) * 2011-11-09 2013-09-11 トヨタ自動車株式会社 内燃機関の排気浄化装置
GB2510888A (en) * 2013-02-18 2014-08-20 Ford Global Tech Llc A catalytic converter assembly
DE102016113396A1 (de) * 2016-07-20 2018-01-25 Man Diesel & Turbo Se Abgasnachbehandlungssystem und Brennkraftmaschine
DE102018215031A1 (de) * 2018-09-04 2020-03-05 Continental Automotive Gmbh Ringkatalysator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3722189A (en) * 1971-05-24 1973-03-27 Chemical Construction Corp Apparatus for removing hydrocarbons from a gas stream
DE2242856A1 (de) * 1971-08-31 1973-03-08 Alfa Romeo Spa Auspufftopf mit katalysator mit vertikaler durchflussrichtung
US3966419B2 (en) * 1974-11-18 1988-01-12 Catalytic converter having monolith with mica support means therefor
US5460789A (en) * 1991-12-20 1995-10-24 Eisenmann Maschinenbau Kg Apparatus for purifying pollutant-containing outgoing air from industrial installations by regenerative afterburning
GB2357048B (en) * 1999-12-09 2003-08-20 Eminox Ltd Apparatus

Also Published As

Publication number Publication date
ATE293748T1 (de) 2005-05-15
GB0125575D0 (en) 2001-12-19
EP1438488A1 (fr) 2004-07-21
DE60203817D1 (de) 2005-05-25
DE60203817T2 (de) 2006-03-02
WO2003036052A1 (fr) 2003-05-01
GB2381220A (en) 2003-04-30
GB2381220B (en) 2004-01-14

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