US20140216015A1 - Exhaust gas purification apparatus for internal combustion engine - Google Patents
Exhaust gas purification apparatus for internal combustion engine Download PDFInfo
- Publication number
- US20140216015A1 US20140216015A1 US14/240,527 US201114240527A US2014216015A1 US 20140216015 A1 US20140216015 A1 US 20140216015A1 US 201114240527 A US201114240527 A US 201114240527A US 2014216015 A1 US2014216015 A1 US 2014216015A1
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- United States
- Prior art keywords
- reducing agent
- exhaust gas
- addition valve
- dispersion member
- gas purification
- 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.)
- Abandoned
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- 238000000746 purification Methods 0.000 title claims abstract description 35
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 31
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 251
- 239000006185 dispersion Substances 0.000 claims abstract description 111
- 239000003054 catalyst Substances 0.000 claims abstract description 39
- 239000002245 particle Substances 0.000 claims abstract description 12
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 12
- 239000007921 spray Substances 0.000 claims description 23
- 238000002347 injection Methods 0.000 claims description 20
- 239000007924 injection Substances 0.000 claims description 20
- 239000010419 fine particle Substances 0.000 abstract description 39
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 25
- 238000010276 construction Methods 0.000 description 19
- 229910021529 ammonia Inorganic materials 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 9
- 238000002156 mixing Methods 0.000 description 6
- 230000000149 penetrating effect Effects 0.000 description 6
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 5
- 239000007864 aqueous solution Substances 0.000 description 5
- 239000004202 carbamide Substances 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- 230000007062 hydrolysis Effects 0.000 description 4
- 238000006460 hydrolysis reaction Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- BVCZEBOGSOYJJT-UHFFFAOYSA-N ammonium carbamate Chemical compound [NH4+].NC([O-])=O BVCZEBOGSOYJJT-UHFFFAOYSA-N 0.000 description 2
- KXDHJXZQYSOELW-UHFFFAOYSA-N carbonic acid monoamide Natural products NC(O)=O KXDHJXZQYSOELW-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Images
Classifications
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- 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
-
- 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
- F01N3/2066—Selective catalytic reduction [SCR]
-
- 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
- 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
- B01F25/431974—Support members, e.g. tubular collars, with projecting baffles fitted inside the mixing tube or adjacent to the inner wall
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- 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
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
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- 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
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- 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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to a technique for performing purification of an exhaust gas by supplying a reducing agent to an exhaust gas purification catalyst provided in an exhaust gas passage of an internal combustion engine.
- An exhaust gas purification apparatus for an internal combustion engine which is provided with an exhaust gas purification catalyst arranged in an exhaust gas passage of an internal combustion engine, a reducing agent injection valve arranged in the exhaust gas passage upstream from the exhaust gas purification catalyst, and a collision diffusion member arranged in the exhaust gas passage downstream from the reducing agent injection valve and upstream from the exhaust gas purification catalyst (see, for example, Patent Document 1).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2009-41370A.
- the present invention has been made taking the foregoing actual circumstances into consideration, an object of which is to enable the fine particle formation and the improvement in the dispersibility of a reducing agent while suppressing the increase in the exhaust resistance to be small, in an exhaust gas purification apparatus for an internal combustion engine comprising an exhaust gas purification catalyst which is arranged in an exhaust gas passage of the internal combustion engine, a reducing agent addition valve which adds the reducing agent into an exhaust gas allowed to flow through the upstream of the exhaust gas purification catalyst, and a dispersion member which is provided to disperse, in the exhaust gas passage, the reducing agent added from the reducing agent addition valve.
- an exhaust gas purification apparatus for an internal combustion engine is provided with an exhaust gas purification catalyst which is arranged in an exhaust gas passage of the internal combustion engine, for a reducing agent added from a reducing agent addition valve, the reducing agent addition valve which adds the reducing agent to an exhaust gas allowed to flow through the upstream of the exhaust gas purification catalyst, and a dispersion member which disperses the reducing agent added from the reducing agent addition valve, wherein the dispersion member is arranged only on a flight route of a coarse reducing agent which is included in the reducing agent added from the reducing agent addition valve and which has relatively large particle diameters.
- an exhaust gas purification apparatus for an internal combustion engine comprises:
- an exhaust gas purification catalyst which is arranged in an exhaust gas passage of the internal combustion engine
- a reducing agent addition valve which adds a reducing agent to an exhaust gas allowed to flow upstream from the exhaust gas purification catalyst
- a dispersion member which is a member for allowing the reducing agent added from the reducing agent addition valve to collide therewith and which is arranged on a flight route of a coarse reducing agent, the coarse reducing agent being included in the reducing agent added from the reducing agent addition valve and the coarse reducing agent being the reducing agent having relatively large particle diameters.
- the coarse reducing agent which is included in the reducing agent added from the reducing agent addition valve, collides with the dispersion member.
- the coarse reducing agent collides with the dispersion member, then the coarse reducing agent is formed or converted into fine particles thereby, and the coarse reducing agent is dispersed in the exhaust gas.
- the uniform or homogeneous mixing is facilitated between the coarse reducing agent and the exhaust gas.
- the reducing agent (hereinafter referred to as “fine particle reducing agent”), which is included in the reducing agent added from the reducing agent addition valve and which has particle diameters smaller than those of the coarse reducing agent, does not collides with the dispersion member.
- the fine particle reducing agent has the small particle diameters and the small weight. Therefore, even when the fine particle reducing agent does not collide with the dispersion member, the fine particle reducing agent is mixed with the exhaust gas uniformly or homogeneously.
- the dispersion member of the present invention substantially all of the reducing agent added from the reducing agent addition valve is mixed with the exhaust gas uniformly. Further, the size of the dispersion member of the present invention is smaller than the size to be provided when substantially the whole quantity of the reducing agent added from the reducing agent addition valve is allowed to collide with the dispersion member. As a result, the increase in the exhaust resistance resulting from the dispersion member can be suppressed to be small.
- the exhaust gas purification apparatus for the internal combustion engine of the present invention it is possible to effect the fine particle formation of the reducing agent and the improvement in the dispersibility while the increase in the exhaust resistance resulting from the dispersion member is suppressed to the minimum. As a result, it is possible to effect the uniform or homogeneous mixing between the reducing agent and the exhaust gas while suppressing the increase in the back pressure and the decrease in the engine output to be small.
- the “coarse reducing agent” referred to herein expresses, for example, the reducing agent having a size capable of possessing the inertial force for slipping through (passing through) the exhaust gas purification catalyst, the reducing agent having a size (weight or mass) capable of penetrating through the exhaust gas without being mixed with the exhaust gas uniformly, or the reducing agent having a size incapable of being vaporized until arrival at the exhaust gas purification catalyst from the reducing agent addition valve.
- a reducing agent originating from ammonia for example, aqueous solution of urea, ammonium carbamate or the like
- the reducing agent having a size not hydrolyzed in the exhaust gas is defined as the coarse reducing agent. It is assumed that the flight route of the coarse reducing agent as described above is previously determined experimentally.
- the dispersion member may be arranged so that the dispersion member interferes with the circumferential edge portion of the spray, and the dispersion member does not interfere with the central portion of the spray.
- the dispersion member may be arranged on a route along which the circumferential edge portion of the cone-shaped spray flies.
- the dispersion member may be a member having a protruding portion which is formed on one end surface of a cylindrical member and which extends outwardly in a radial direction or inwardly in the radial direction.
- the fine particle reducing agent which gathers at the central portion of the cone-shaped spray, flows to the downstream through the inside of the cylindrical member
- the coarse reducing agent which gathers at the circumferential edge portion of the cone-shaped spray, collides with the protruding portion so that the coarse reducing agent is formed or converted into fine particles.
- the flow of the exhaust gas is disturbed by causing the collision of the exhaust gas with the protruding portion or by making a detour to avoid the protruding portion. Therefore, the mixing is facilitated between the exhaust gas and the reducing agent converted into the fine particles.
- a plate member which is formed to have an annular form, can be also used as the dispersion member.
- the fine particle reducing agent which gathers at the central portion of the cone-shaped spray, passes through the inner side of the annular plate member, and the coarse reducing agent, which gathers at the circumferential edge portion of the cone-shaped spray, collides with the plate member so that the coarse reducing agent is converted into fine particles.
- the flow of the exhaust gas is disturbed by causing the collision of the exhaust gas with the plate member or by making a detour to avoid the plate member. Therefore, the mixing is facilitated between the exhaust gas and the reducing agent converted into the fine particles.
- protrusions and recesses may be provided on a surface of the plate member (surface opposed to the flow of the exhaust gas and the reducing agent).
- the diffusion of the coarse reducing agent allowed to collide with the surface of the plate member is facilitated, and the vaporization (evaporation) of the coarse reducing agent adhered to the surface of the plate member is facilitated.
- the annular plate member When the annular plate member is used as the dispersion member, a plurality of through-holes, which penetrate through the plate member, may be provided for the plate member.
- the diameter of the through-hole is smaller than the diameter of the coarse reducing agent.
- the dispersion member may be constructed by arranging a plurality of plate members in an annular form. According to the construction as described above, the increase in the exhaust resistance, which results from the dispersion member, can be suppressed to be smaller. Further, the respective plate members may be arranged perpendicularly with respect to the traveling direction of the spray, or the respective plate members may be arranged obliquely with respect to the traveling direction of the spray.
- the dispersion member according to the present invention may be provided at a plurality of positions on the flight route of the coarse reducing agent.
- the coarse reducing agent easily collides with at least one of the plurality of dispersion members. Therefore, the coarse reducing agent is formed or converted into fine particles more reliably. Further, when the coarse reducing agent collides with the plurality of dispersion members, the coarse reducing agent can be formed or converted into smaller fine particle reducing agent.
- the exhaust gas purification apparatus for the internal combustion engine comprising the exhaust gas purification catalyst which is arranged in the exhaust gas passage of the internal combustion engine, the reducing agent addition valve which adds the reducing agent into the exhaust gas allowed to flow through the upstream from the exhaust gas purification catalyst, and the dispersion member which disperses, in the exhaust gas passage, the reducing agent added from the reducing agent addition valve.
- FIG. 1 shows a schematic construction of an exhaust system of an internal combustion engine to which the present invention is applied.
- FIG. 2 shows a spray shape of the reducing agent injected from a reducing agent addition valve.
- FIG. 3 shows a construction of a dispersion member in a first embodiment.
- FIG. 4 shows relative positions of the reducing agent injected from the reducing agent addition valve and the dispersion member.
- FIG. 5 shows a modified embodiment of the dispersion member in the first embodiment.
- FIG. 6 shows a modified embodiment of the dispersion member in the first embodiment.
- FIG. 7 shows a modified embodiment of the dispersion member in the first embodiment.
- FIG. 8 shows a modified embodiment of the dispersion member in the first embodiment.
- FIG. 9 shows a modified embodiment of the dispersion member in the first embodiment.
- FIG. 10 shows a spray shape of the reducing agent injected from a multi-hole type reducing agent addition valve.
- FIG. 11 shows a construction of a dispersion member adapted to the multi-hole type reducing agent addition valve.
- FIG. 12 shows a spray shape of the reducing agent injected from a slit type reducing agent addition valve.
- FIG. 13 shows a construction of a dispersion member adapted to the slit type reducing agent addition valve.
- FIG. 14 shows another exemplary arrangement of a reducing agent addition valve and a dispersion member in the first embodiment.
- FIG. 15 shows still another exemplary arrangement of a reducing agent addition valve and a dispersion member in the first embodiment.
- FIG. 16 shows a construction of a dispersion member in a second embodiment.
- FIG. 17 shows a modified embodiment of the dispersion member in the second embodiment.
- FIG. 18 shows another exemplary arrangement of a reducing agent addition valve and a dispersion member in the second embodiment.
- FIG. 19 shows a plan view illustrating a construction of the dispersion member shown in FIG. 18 .
- FIG. 20 shows a modified embodiment of the dispersion member shown in FIG. 18 .
- FIG. 21 shows a plan view illustrating a construction of a dispersion member provided when the reducing agent addition valve shown in FIG. 18 is a slit type reducing agent addition valve.
- FIG. 1 shows a schematic construction of an exhaust system of an internal combustion engine to which the present invention is applied.
- the internal combustion engine 1 shown in FIG. 1 is a compression ignition type internal combustion engine (diesel engine) which uses light oil as fuel.
- An exhaust gas passage 2 is connected to the internal combustion engine 1 .
- a catalyst casing 3 which accommodates a selective reduction catalyst 30 , is arranged at an intermediate position of the exhaust gas passage 2 .
- a reducing agent addition valve 4 is attached to the exhaust gas passage 2 upstream from the catalyst casing 3 .
- the reducing agent addition valve 4 is attached to the exhaust gas passage 2 so that the axial direction of the reducing agent addition valve 4 is parallel to the axial direction of the catalyst casing 3 (selective reduction catalyst 30 ).
- the reducing agent addition valve 4 is arranged so that the axial direction of the reducing agent addition valve 4 is parallel to the flow direction of the exhaust gas allowed to flow into the selective reduction catalyst 30 .
- the reducing agent addition valve 4 is communicated with a reducing agent tank 41 via a pump 40 .
- a reducing agent originating from ammonia is stored in the reducing agent tank 41 .
- the pump 40 pumps up the reducing agent from the reducing agent tank 41 , and the pump 40 discharges the pumped up reducing agent to the reducing agent addition valve 4 .
- the reducing agent addition valve 4 injects the reducing agent discharged from the pump 40 into the exhaust gas passage 2 .
- the opening/closing operation of the reducing agent addition valve 4 is electrically controlled by an electronically controlled unit (ECU) 6 .
- ECU electronically controlled unit
- an aqueous solution of urea, ammonium carbamate or the like can be used as the reducing agent originating from ammonia.
- the aqueous solution of urea is used as the reducing agent originating from ammonia.
- a part of ammonia (NH 3 ) which is produced by the hydrolysis of the aqueous solution of urea, sometimes passes through (slips through) the selective reduction catalyst. Therefore, the catalyst casing 3 may accommodate an ammonia oxidation catalyst 31 downstream from the selective reduction catalyst 30 .
- ammonia (NH 3 ) which passes through (slips through) the selective reduction catalyst 30 , is oxidized by the ammonia oxidation catalyst 31 .
- ammonia (NH 3 ) is discharged to the atmospheric air.
- a dispersion member 5 is arranged in the exhaust gas passage 2 positioned between the reducing agent addition valve 4 and the catalyst casing 3 .
- the dispersion member 5 is the member which does not collide with the fine particle reducing agent having relatively small particle diameters and which collides with the coarse reducing agent having relatively large particle diameters, the fine particle reducing agent and the coarse reducing agent being included in the reducing agent injected from the reducing agent addition valve 4 .
- the “coarse reducing agent” referred to herein is the reducing agent having a size (particle diameter) capable of possessing the inertial force for slipping through (passing through) the selective reduction catalyst 30 , the reducing agent having a size capable of penetrating through the exhaust gas without being mixed with the exhaust gas uniformly, or the reducing agent having a size incapable of being vaporized (not subjected to hydrolysis) until arrival at the selective reduction catalyst 30 from the reducing agent addition valve 4 .
- the “fine particle reducing agent” is the reducing agent having small particle diameters as compared with the coarse reducing agent, which is the reducing agent having a size capable of being hydrolyzed until arrival at the selective reduction catalyst 30 from the reducing agent addition valve 4 .
- the dispersion member 5 is arranged on the flight route of the coarse reducing agent injected from the reducing agent addition valve 4 .
- the reducing agent addition valve 4 is an injection valve which forms a full cone-shaped (cone-shaped) or hollow cone-shaped (shape of hollow cone) spray
- the coarse reducing agent tends to gather at the circumferential edge portion (A shown in FIG. 2 ) of the cone-shaped spray (S shown in FIG. 2 ).
- the dispersion member 5 of this embodiment is constructed by an annular plate member having an open central portion. In this arrangement, the dispersion member 5 is fixed in the exhaust gas passage 2 by a plurality of support shafts 50 .
- the dispersion member 5 is arranged at a position separated from the reducing agent addition valve 4 , the outer diameter of the cone-shaped spray is increased. Therefore, it is necessary to increase the outer diameter of the dispersion member 5 . If the outer diameter of the dispersion member 5 is increased, the exhaust resistance is increased. Therefore, it is preferable that the dispersion member 5 is arranged at a position which is close to the reducing agent addition valve 4 as much as possible. When the dispersion member 5 is arranged in the vicinity of the reducing agent addition valve 4 , the outer diameter of the dispersion member 5 can be suppressed to be small. As a result, the increase in the exhaust resistance, which would be otherwise caused by the dispersion member 5 , can be suppressed to be small.
- the coarse reducing agent of the reducing agent injected from the reducing agent addition valve 4 collides with the dispersion member 5 .
- the coarse reducing agent collides with the dispersion member 5
- the coarse reducing agent is converted into fine particles.
- the coarse reducing agent which has been converted into fine particles, is dispersed in the exhaust gas.
- the fine particle reducing agent is uniformly mixed with the exhaust gas, even when the fine particle reducing agent does not collide with the dispersion member 5 , because the particle diameter is small and the weight (mass) is small.
- substantially all of the reducing agent injected from the reducing agent addition valve 4 is mixed with the exhaust gas uniformly or homogeneously.
- the size of the dispersion member 5 (front surface projected area in the flow direction of the exhaust gas) is decreased as compared with when all of the reducing agent injected from the reducing agent addition valve 4 is allowed to collide therewith. Therefore, it is possible to realize the fine particle formation of the reducing agent and the improvement in the dispersibility, while suppressing and decreasing the increase in the exhaust resistance which would be otherwise caused by the arrangement of the dispersion member 5 .
- annular plate member is used as the dispersion member 5 , is described in this embodiment.
- FIG. 5 it is also allowable to use an annular plate member provided with a plurality of through-holes 51 .
- the diameters of the through-holes 51 are formed to be smaller than the particle diameter of the coarse reducing agent, a part of the exhaust gas and the reducing agent converted into fine particle as a result of the collision with the dispersion member 5 pass through the through-holes 51 . Therefore, it is possible to further decrease the exhaust resistance resulting from the dispersion member 5 .
- the dispersion member 5 When an annular plate member is used as the dispersion member 5 , it is also allowable that protrusions and recesses are provided on the surface disposed on the upstream side. In this case, the reducing agent in the liquid phase, which is adhered to the dispersion member 5 , is easily vaporized.
- the method for providing the protrusions and recesses on the surface of the dispersion member 5 as shown in FIG. 6 , it is possible to use a method in which a plate member having a wavy cross section is formed to have an annular shape.
- the dispersion member 5 it is also possible to use a member in which a plurality of plate members (blades or vanes) 53 are arranged in a spiral form on the inner circumferential surface of a cylindrical member 52 .
- the plurality of blades 53 are arranged so that they are not brought in contact with each other.
- the coarse reducing agent and the exhaust gas which collide with the blades of the dispersion member 5 , swirl in a spiral form.
- the mixing is facilitated between the exhaust gas and the reducing agent converted into fine particles by making collision with the blades.
- the plurality of blades 53 are arranged while providing gaps therebetween. Therefore, the increase in the exhaust resistance caused by the dispersion member 5 can be suppressed to be smaller as well.
- the dispersion member 5 As shown in FIG. 8 , it is also possible to use a member in which an annular plate member is formed to have a tapered form. In this arrangement, the portion of the plate member, which is disposed inwardly in the radial direction, is positioned on the downstream side in the exhaust gas flow direction as compared with the portion which is disposed outwardly in the radial direction. According to the construction as described above, the angle of collision between the dispersion member 5 and the exhaust gas is smaller than the right angle. Therefore, the increase in the exhaust resistance caused by the dispersion member 5 can be further suppressed to be small.
- the dispersion member 5 As shown in FIG. 9 , it is also possible to use a member in which an upstream side end portion of a cylindrical member protrudes outwardly in the radial direction.
- the exhaust gas which makes a detour to avoid the dispersion member 5 , generates the back step flow as shown by the arrow in FIG. 9 . Therefore, the agitation is facilitated between the exhaust gas and the reducing agent. As a result, the exhaust gas and the reducing agent are mixed with each other uniformly.
- the reducing agent addition valve 4 When a multi-hole type injection valve, in which a plurality of injection holes are arranged in an annular form, is used as the reducing agent addition valve 4 , as shown in FIG. 10 , the reducing agent, which is injected from the respective injection holes, forms a full cone-shaped (cone-shaped) or hollow cone-shaped (shape of hollow cone) spray. Accordingly, when the multi-hole type injection valve is used as the reducing agent addition valve 4 , it is also appropriate to adopt a construction as shown in FIG. 11 as a dispersion member 5 .
- the dispersion member 5 shown in FIG. 11 is the member in which a plurality of plate members 55 are provided on the inner circumferential surface of an annular member 54 .
- the respective plate members 55 are arranged on the flight routes of the reducing agent injected from the respective injection holes 22 . Further, through-holes 56 are formed at portions overlapped with the flight routes of the fine particle reducing agent in the respective plate members 55 . According to the dispersion member 5 as described above, only the coarse reducing agent, which is included in the reducing agent injected from the respective injection holes 22 , can be allowed to collide with the plate members 55 . As a result, it is possible to realize the fine particle formation of the coarse reducing agent and the improvement in the dispersibility thereof, while suppressing and decreasing the increase in the exhaust resistance caused by the dispersion member 5 . In the example shown in FIG. 11 , the dispersion member 5 is provided with the four plate members 55 . However, the number of the plate members 55 may be either not more than three or not less than five. In short, it is appropriate that the same number of the plate members as the number of the injection holes of the reducing agent addition valve 4 are provided.
- the reducing agent addition valve 4 When a slit type injection valve, which has an injection hole having a rectangular cross section, is used as the reducing agent addition valve 4 , as shown in FIG. 12 , the reducing agent, which is injected from the reducing agent addition valve 4 , forms a sectoral spray. In this arrangement, the coarse reducing agent tends to gather at the both ends of the sectoral spray (A shown in FIG. 12 ). Accordingly, when the slit type injection valve is used as the reducing agent addition valve 4 , it is also allowable to adopt a construction as shown in FIG. 13 as the dispersion member 5 .
- the dispersion member 5 shown in FIG. 13 is the member in which plate members 57 are provided at opposing two positions on the inner circumferential surface of an annular member 54 .
- the dispersion member 5 as described above, only the coarse reducing agent, which is included in the reducing agent injected from the reducing agent addition valve 4 , can be allowed to collide with the plate member 57 . As a result, it is possible to realize the fine particle formation of the coarse reducing agent and the improvement in the dispersibility thereof, while suppressing and decreasing the increase in the exhaust resistance caused by the dispersion member 5 .
- the example has been described, in which the reducing agent addition valve 4 is arranged so that the axial direction of the reducing agent addition valve 4 is parallel to the flow direction of the exhaust gas.
- the reducing agent addition valve 4 may be arranged so that the axial direction of the reducing agent addition valve 4 obliquely intersects the flow direction of the exhaust gas.
- the dispersion member 5 may be arranged perpendicularly to the flow direction of the exhaust gas on the flight route of the coarse reducing agent (A shown in FIG. 14 ). Further, as shown in FIG.
- the dispersion member 5 may be arranged obliquely with respect to the flow direction of the exhaust gas on the flight route of the coarse reducing agent (A shown in FIG. 15 ). In short, the dispersion member 5 may be arranged in any manner provided that the dispersion member 5 is disposed on the flight route of the coarse reducing agent.
- FIGS. 16 to 21 a second embodiment of the exhaust gas purification apparatus for the internal combustion engine according to the present invention.
- the construction different from that of the first embodiment described above will be explained, and the same or equivalent construction will be omitted from the explanation.
- the difference between the first embodiment described above and this embodiment resides in that the coarse reducing agent, which is injected from the reducing agent addition valve 4 , is allowed to collide with the dispersion member 5 a plurality of times.
- FIG. 16 shows a construction of a dispersion member 5 in this embodiment.
- the dispersion member 5 is provided with a cylindrical member 58 , and an annular protruding portion 59 which protrudes inwardly in the radial direction from the end portion on the downstream side of the cylindrical member 58 .
- the cylindrical member 58 and the protruding portion 59 are arranged on the flight route of the coarse reducing agent injected from the reducing agent addition valve 4 .
- the coarse reducing agent collides with the inner wall surface of the protruding portion 59 after colliding with the inner wall surface of the cylindrical member 58 in some cases, and the coarse reducing agent collides with the inner wall surface of the cylindrical member 58 after colliding with the inner wall surface of the protruding portion 59 in other cases.
- the conversion into fine particles (fine particle formation) of the coarse reducing agent is further facilitated.
- the coarse reducing agent stays in the space surrounded by the cylindrical member 58 and the protruding portion 59 . Therefore, it is possible to facilitate the vaporization and the hydrolysis of the coarse reducing agent, and it is also possible to facilitate the mixing with the exhaust gas.
- the protruding portion 59 protrudes perpendicularly to the cylindrical member 58 (in parallel to the radial direction of the exhaust gas passage 2 ).
- the protruding portion 59 may protrude while being inclined to the upstream side in the flow direction of the exhaust gas. According to the construction as described above, the coarse reducing agent more reliably collides with both of the inner wall surface of the cylindrical member 58 and the inner wall surface of the protruding portion 59 , and the coarse reducing agent easily stays in the space surrounded by the cylindrical member 58 and the protruding portion 59 .
- the protruding portion 59 may protrude outwardly in the radial direction from the end portion on the downstream side of the cylindrical member 58 .
- the example has been described, in which the reducing agent addition valve 4 is arranged so that the axial direction of the reducing agent addition valve 4 is parallel to the flow direction of the exhaust gas.
- the reducing agent addition valve 4 may be arranged so that the axial direction of the reducing agent addition valve 4 is perpendicular to the flow direction of the exhaust gas.
- a dispersion member 5 may be provided with a plurality of collision members 500 arranged in the radial direction of the exhaust gas passage 2 .
- each of the collision members 500 is constructed by a plate member provided with a plurality of through-holes 501 .
- any through-hole 501 is not provided at a portion 502 overlapped with the flight route of the coarse reducing agent (the portion 502 is hereinafter referred to as “non-penetrating portion 502 ”).
- the fine particle reducing agent passes through the through-holes of the collision members 500 , and the coarse reducing agent collides with the non-penetrating portions 502 of the plurality of collision members 500 a plurality of times, the fine particle reducing agent and the coarse reducing agent being included in the reducing agent injected from the reducing agent addition valve 4 .
- the fine particle reducing agent and the coarse reducing agent being included in the reducing agent injected from the reducing agent addition valve 4 .
- the plurality of collision members 500 may be arranged on only the flight route of the coarse reducing agent.
- each of the collision members 500 it is possible to use a flat plate, a cylindrical member, or a member obtained by forming a semicylindrical member to have an annular form.
- the coarse reducing agent can be allowed to collide with the plurality of collision members 500 .
- the dispersion member 5 may be a plate-shaped collision member 500 provided with a plurality of through-holes 501 as shown in FIG. 21 , wherein the dispersion member 5 is the member in which non-penetrating portions 502 are formed at positions corresponding to the both ends of the sectoral spray.
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Abstract
The present invention resides in an exhaust gas purification apparatus for an internal combustion engine, comprising an exhaust gas purification catalyst which is arranged in an exhaust gas passage of the internal combustion engine for a reducing agent added from a reducing agent addition valve, the reducing agent addition valve which adds the reducing agent to an exhaust gas allowed to flow upstream from the exhaust gas purification catalyst, and a dispersion member which disperses the reducing agent added from the reducing agent addition valve, wherein a task or object thereof is to form fine particles of the reducing agent and improve the dispersibility while suppressing the increase in the exhaust resistance caused by the dispersion member to be small. In order to solve the task or achieve the object, in the present invention, the dispersion member is arranged only on a flight route of a coarse reducing agent which is included in the reducing agent added from the reducing agent addition valve and which has relatively large particle diameters.
Description
- The present invention relates to a technique for performing purification of an exhaust gas by supplying a reducing agent to an exhaust gas purification catalyst provided in an exhaust gas passage of an internal combustion engine.
- An exhaust gas purification apparatus for an internal combustion engine is known, which is provided with an exhaust gas purification catalyst arranged in an exhaust gas passage of an internal combustion engine, a reducing agent injection valve arranged in the exhaust gas passage upstream from the exhaust gas purification catalyst, and a collision diffusion member arranged in the exhaust gas passage downstream from the reducing agent injection valve and upstream from the exhaust gas purification catalyst (see, for example, Patent Document 1).
- Patent Document 1: Japanese Patent Application Laid-Open No. 2009-41370A.
- When the reducing agent, which is injected from the reducing agent injection valve, collides with the collision diffusion member, then the reducing agent is dispersed in the exhaust gas passage, and the reducing agent is easily mixed with the exhaust gas uniformly or homogeneously. However, the exhaust resistance (exhaust back pressure) is increased by the collision diffusion member. Therefore, a possibility also arises such that the increase in the back pressure may be caused and/or the decrease in the engine output may be caused, for example, during the high load operation of the internal combustion engine.
- The present invention has been made taking the foregoing actual circumstances into consideration, an object of which is to enable the fine particle formation and the improvement in the dispersibility of a reducing agent while suppressing the increase in the exhaust resistance to be small, in an exhaust gas purification apparatus for an internal combustion engine comprising an exhaust gas purification catalyst which is arranged in an exhaust gas passage of the internal combustion engine, a reducing agent addition valve which adds the reducing agent into an exhaust gas allowed to flow through the upstream of the exhaust gas purification catalyst, and a dispersion member which is provided to disperse, in the exhaust gas passage, the reducing agent added from the reducing agent addition valve.
- In the present invention, in order to achieve the object described above, an exhaust gas purification apparatus for an internal combustion engine is provided with an exhaust gas purification catalyst which is arranged in an exhaust gas passage of the internal combustion engine, for a reducing agent added from a reducing agent addition valve, the reducing agent addition valve which adds the reducing agent to an exhaust gas allowed to flow through the upstream of the exhaust gas purification catalyst, and a dispersion member which disperses the reducing agent added from the reducing agent addition valve, wherein the dispersion member is arranged only on a flight route of a coarse reducing agent which is included in the reducing agent added from the reducing agent addition valve and which has relatively large particle diameters.
- In particular, an exhaust gas purification apparatus for an internal combustion engine according to the present invention comprises:
- an exhaust gas purification catalyst which is arranged in an exhaust gas passage of the internal combustion engine;
- a reducing agent addition valve which adds a reducing agent to an exhaust gas allowed to flow upstream from the exhaust gas purification catalyst; and
- a dispersion member which is a member for allowing the reducing agent added from the reducing agent addition valve to collide therewith and which is arranged on a flight route of a coarse reducing agent, the coarse reducing agent being included in the reducing agent added from the reducing agent addition valve and the coarse reducing agent being the reducing agent having relatively large particle diameters.
- According to the construction as described above, only the coarse reducing agent, which is included in the reducing agent added from the reducing agent addition valve, collides with the dispersion member. When the coarse reducing agent collides with the dispersion member, then the coarse reducing agent is formed or converted into fine particles thereby, and the coarse reducing agent is dispersed in the exhaust gas. As a result, the uniform or homogeneous mixing is facilitated between the coarse reducing agent and the exhaust gas.
- On the other hand, the reducing agent (hereinafter referred to as “fine particle reducing agent”), which is included in the reducing agent added from the reducing agent addition valve and which has particle diameters smaller than those of the coarse reducing agent, does not collides with the dispersion member. However, the fine particle reducing agent has the small particle diameters and the small weight. Therefore, even when the fine particle reducing agent does not collide with the dispersion member, the fine particle reducing agent is mixed with the exhaust gas uniformly or homogeneously.
- Therefore, according to the dispersion member of the present invention, substantially all of the reducing agent added from the reducing agent addition valve is mixed with the exhaust gas uniformly. Further, the size of the dispersion member of the present invention is smaller than the size to be provided when substantially the whole quantity of the reducing agent added from the reducing agent addition valve is allowed to collide with the dispersion member. As a result, the increase in the exhaust resistance resulting from the dispersion member can be suppressed to be small.
- Therefore, according to the exhaust gas purification apparatus for the internal combustion engine of the present invention, it is possible to effect the fine particle formation of the reducing agent and the improvement in the dispersibility while the increase in the exhaust resistance resulting from the dispersion member is suppressed to the minimum. As a result, it is possible to effect the uniform or homogeneous mixing between the reducing agent and the exhaust gas while suppressing the increase in the back pressure and the decrease in the engine output to be small.
- The “coarse reducing agent” referred to herein expresses, for example, the reducing agent having a size capable of possessing the inertial force for slipping through (passing through) the exhaust gas purification catalyst, the reducing agent having a size (weight or mass) capable of penetrating through the exhaust gas without being mixed with the exhaust gas uniformly, or the reducing agent having a size incapable of being vaporized until arrival at the exhaust gas purification catalyst from the reducing agent addition valve. When a reducing agent originating from ammonia (for example, aqueous solution of urea, ammonium carbamate or the like) is used as the reducing agent, it is also allowable that the reducing agent having a size not hydrolyzed in the exhaust gas is defined as the coarse reducing agent. It is assumed that the flight route of the coarse reducing agent as described above is previously determined experimentally.
- In the present invention, when the reducing agent addition valve is an injection valve having a cone-shaped (full cone-shaped) spray pattern, the coarse reducing agent tends to gather at the circumferential edge portion of the spray. Therefore, the dispersion member may be arranged so that the dispersion member interferes with the circumferential edge portion of the spray, and the dispersion member does not interfere with the central portion of the spray. In other words, the dispersion member may be arranged on a route along which the circumferential edge portion of the cone-shaped spray flies.
- In this arrangement, the dispersion member may be a member having a protruding portion which is formed on one end surface of a cylindrical member and which extends outwardly in a radial direction or inwardly in the radial direction. In this arrangement, the fine particle reducing agent, which gathers at the central portion of the cone-shaped spray, flows to the downstream through the inside of the cylindrical member, and the coarse reducing agent, which gathers at the circumferential edge portion of the cone-shaped spray, collides with the protruding portion so that the coarse reducing agent is formed or converted into fine particles. Further, the flow of the exhaust gas is disturbed by causing the collision of the exhaust gas with the protruding portion or by making a detour to avoid the protruding portion. Therefore, the mixing is facilitated between the exhaust gas and the reducing agent converted into the fine particles.
- In another viewpoint, a plate member, which is formed to have an annular form, can be also used as the dispersion member. In this arrangement, the fine particle reducing agent, which gathers at the central portion of the cone-shaped spray, passes through the inner side of the annular plate member, and the coarse reducing agent, which gathers at the circumferential edge portion of the cone-shaped spray, collides with the plate member so that the coarse reducing agent is converted into fine particles. Further, the flow of the exhaust gas is disturbed by causing the collision of the exhaust gas with the plate member or by making a detour to avoid the plate member. Therefore, the mixing is facilitated between the exhaust gas and the reducing agent converted into the fine particles.
- When the annular plate member is used as the dispersion member, protrusions and recesses may be provided on a surface of the plate member (surface opposed to the flow of the exhaust gas and the reducing agent). In this arrangement, the diffusion of the coarse reducing agent allowed to collide with the surface of the plate member is facilitated, and the vaporization (evaporation) of the coarse reducing agent adhered to the surface of the plate member is facilitated.
- When the annular plate member is used as the dispersion member, a plurality of through-holes, which penetrate through the plate member, may be provided for the plate member. In this arrangement, it is desirable that the diameter of the through-hole is smaller than the diameter of the coarse reducing agent. According to the plate member constructed as described above, the exhaust gas and the reducing agent converted into fine particles by the collision with the plate member can be allowed to pass through the through-holes. As a result, the exhaust resistance, which is caused by or results from the dispersion member, can be further decreased.
- When a multi-hole type injection valve, in which a plurality of injection holes are arranged in an annular form, is used as the reducing agent addition valve, the dispersion member may be constructed by arranging a plurality of plate members in an annular form. According to the construction as described above, the increase in the exhaust resistance, which results from the dispersion member, can be suppressed to be smaller. Further, the respective plate members may be arranged perpendicularly with respect to the traveling direction of the spray, or the respective plate members may be arranged obliquely with respect to the traveling direction of the spray.
- The dispersion member according to the present invention may be provided at a plurality of positions on the flight route of the coarse reducing agent. In this arrangement, the coarse reducing agent easily collides with at least one of the plurality of dispersion members. Therefore, the coarse reducing agent is formed or converted into fine particles more reliably. Further, when the coarse reducing agent collides with the plurality of dispersion members, the coarse reducing agent can be formed or converted into smaller fine particle reducing agent.
- According to the present invention, it is possible to enable the fine particle formation and the improvement in the dispersibility of the reducing agent while suppressing the increase in the exhaust resistance to be small, in the exhaust gas purification apparatus for the internal combustion engine, comprising the exhaust gas purification catalyst which is arranged in the exhaust gas passage of the internal combustion engine, the reducing agent addition valve which adds the reducing agent into the exhaust gas allowed to flow through the upstream from the exhaust gas purification catalyst, and the dispersion member which disperses, in the exhaust gas passage, the reducing agent added from the reducing agent addition valve.
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FIG. 1 shows a schematic construction of an exhaust system of an internal combustion engine to which the present invention is applied. -
FIG. 2 shows a spray shape of the reducing agent injected from a reducing agent addition valve. -
FIG. 3 shows a construction of a dispersion member in a first embodiment. -
FIG. 4 shows relative positions of the reducing agent injected from the reducing agent addition valve and the dispersion member. -
FIG. 5 shows a modified embodiment of the dispersion member in the first embodiment. -
FIG. 6 shows a modified embodiment of the dispersion member in the first embodiment. -
FIG. 7 shows a modified embodiment of the dispersion member in the first embodiment. -
FIG. 8 shows a modified embodiment of the dispersion member in the first embodiment. -
FIG. 9 shows a modified embodiment of the dispersion member in the first embodiment. -
FIG. 10 shows a spray shape of the reducing agent injected from a multi-hole type reducing agent addition valve. -
FIG. 11 shows a construction of a dispersion member adapted to the multi-hole type reducing agent addition valve. -
FIG. 12 shows a spray shape of the reducing agent injected from a slit type reducing agent addition valve. -
FIG. 13 shows a construction of a dispersion member adapted to the slit type reducing agent addition valve. -
FIG. 14 shows another exemplary arrangement of a reducing agent addition valve and a dispersion member in the first embodiment. -
FIG. 15 shows still another exemplary arrangement of a reducing agent addition valve and a dispersion member in the first embodiment. -
FIG. 16 shows a construction of a dispersion member in a second embodiment. -
FIG. 17 shows a modified embodiment of the dispersion member in the second embodiment. -
FIG. 18 shows another exemplary arrangement of a reducing agent addition valve and a dispersion member in the second embodiment. -
FIG. 19 shows a plan view illustrating a construction of the dispersion member shown inFIG. 18 . -
FIG. 20 shows a modified embodiment of the dispersion member shown inFIG. 18 . -
FIG. 21 shows a plan view illustrating a construction of a dispersion member provided when the reducing agent addition valve shown inFIG. 18 is a slit type reducing agent addition valve. - A specified embodiment of the present invention will be explained below on the basis of the drawings. For example, the dimension, the material, the shape, and the relative arrangement of constitutive parts or components described in the embodiment of the present invention are not intended to limit the technical scope of the invention only thereto, unless otherwise noted.
- At first, a first embodiment of the present invention will be explained on the basis of
FIGS. 1 to 15 .FIG. 1 shows a schematic construction of an exhaust system of an internal combustion engine to which the present invention is applied. - The
internal combustion engine 1 shown inFIG. 1 is a compression ignition type internal combustion engine (diesel engine) which uses light oil as fuel. Anexhaust gas passage 2 is connected to theinternal combustion engine 1. Acatalyst casing 3, which accommodates aselective reduction catalyst 30, is arranged at an intermediate position of theexhaust gas passage 2. - A reducing
agent addition valve 4 is attached to theexhaust gas passage 2 upstream from thecatalyst casing 3. In the example shown inFIG. 1 , the reducingagent addition valve 4 is attached to theexhaust gas passage 2 so that the axial direction of the reducingagent addition valve 4 is parallel to the axial direction of the catalyst casing 3 (selective reduction catalyst 30). In other words, the reducingagent addition valve 4 is arranged so that the axial direction of the reducingagent addition valve 4 is parallel to the flow direction of the exhaust gas allowed to flow into theselective reduction catalyst 30. - The reducing
agent addition valve 4 is communicated with a reducingagent tank 41 via apump 40. A reducing agent originating from ammonia is stored in the reducingagent tank 41. Thepump 40 pumps up the reducing agent from the reducingagent tank 41, and thepump 40 discharges the pumped up reducing agent to the reducingagent addition valve 4. The reducingagent addition valve 4 injects the reducing agent discharged from thepump 40 into theexhaust gas passage 2. The opening/closing operation of the reducingagent addition valve 4 is electrically controlled by an electronically controlled unit (ECU) 6. - In this case, an aqueous solution of urea, ammonium carbamate or the like can be used as the reducing agent originating from ammonia. In this embodiment, the aqueous solution of urea is used as the reducing agent originating from ammonia. When the aqueous solution of urea is used as the reducing agent, a part of ammonia (NH3), which is produced by the hydrolysis of the aqueous solution of urea, sometimes passes through (slips through) the selective reduction catalyst. Therefore, the
catalyst casing 3 may accommodate anammonia oxidation catalyst 31 downstream from theselective reduction catalyst 30. When theammonia oxidation catalyst 31 is arranged downstream from theselective reduction catalyst 30, ammonia (NH3), which passes through (slips through) theselective reduction catalyst 30, is oxidized by theammonia oxidation catalyst 31. As a result, it is possible to avoid such a situation that ammonia (NH3) is discharged to the atmospheric air. - A
dispersion member 5 is arranged in theexhaust gas passage 2 positioned between the reducingagent addition valve 4 and thecatalyst casing 3. Thedispersion member 5 is the member which does not collide with the fine particle reducing agent having relatively small particle diameters and which collides with the coarse reducing agent having relatively large particle diameters, the fine particle reducing agent and the coarse reducing agent being included in the reducing agent injected from the reducingagent addition valve 4. - The “coarse reducing agent” referred to herein is the reducing agent having a size (particle diameter) capable of possessing the inertial force for slipping through (passing through) the
selective reduction catalyst 30, the reducing agent having a size capable of penetrating through the exhaust gas without being mixed with the exhaust gas uniformly, or the reducing agent having a size incapable of being vaporized (not subjected to hydrolysis) until arrival at theselective reduction catalyst 30 from the reducingagent addition valve 4. On the other hand, the “fine particle reducing agent” is the reducing agent having small particle diameters as compared with the coarse reducing agent, which is the reducing agent having a size capable of being hydrolyzed until arrival at theselective reduction catalyst 30 from the reducingagent addition valve 4. - The
dispersion member 5 is arranged on the flight route of the coarse reducing agent injected from the reducingagent addition valve 4. For example, when the reducingagent addition valve 4 is an injection valve which forms a full cone-shaped (cone-shaped) or hollow cone-shaped (shape of hollow cone) spray, as shown inFIG. 2 , the coarse reducing agent tends to gather at the circumferential edge portion (A shown inFIG. 2 ) of the cone-shaped spray (S shown inFIG. 2 ). Accordingly, as shown inFIG. 3 , thedispersion member 5 of this embodiment is constructed by an annular plate member having an open central portion. In this arrangement, thedispersion member 5 is fixed in theexhaust gas passage 2 by a plurality ofsupport shafts 50. - In this case, if the
dispersion member 5 is arranged at a position separated from the reducingagent addition valve 4, the outer diameter of the cone-shaped spray is increased. Therefore, it is necessary to increase the outer diameter of thedispersion member 5. If the outer diameter of thedispersion member 5 is increased, the exhaust resistance is increased. Therefore, it is preferable that thedispersion member 5 is arranged at a position which is close to the reducingagent addition valve 4 as much as possible. When thedispersion member 5 is arranged in the vicinity of the reducingagent addition valve 4, the outer diameter of thedispersion member 5 can be suppressed to be small. As a result, the increase in the exhaust resistance, which would be otherwise caused by thedispersion member 5, can be suppressed to be small. - According to the
dispersion member 5 constructed as described above, as shown inFIG. 4 , the coarse reducing agent (A shown inFIG. 4 ), which is included in the reducing agent injected from the reducingagent addition valve 4, collides with thedispersion member 5, and the fine particle reducing agent (B shown inFIG. 4 ) passes through the hollow portion of thedispersion member 5. In other words, only the coarse reducing agent of the reducing agent injected from the reducingagent addition valve 4 collides with thedispersion member 5. - When the coarse reducing agent collides with the
dispersion member 5, the coarse reducing agent is converted into fine particles. The coarse reducing agent, which has been converted into fine particles, is dispersed in the exhaust gas. On the other hand, the fine particle reducing agent is uniformly mixed with the exhaust gas, even when the fine particle reducing agent does not collide with thedispersion member 5, because the particle diameter is small and the weight (mass) is small. As a result, substantially all of the reducing agent injected from the reducingagent addition valve 4 is mixed with the exhaust gas uniformly or homogeneously. - Further, the size of the dispersion member 5 (front surface projected area in the flow direction of the exhaust gas) is decreased as compared with when all of the reducing agent injected from the reducing
agent addition valve 4 is allowed to collide therewith. Therefore, it is possible to realize the fine particle formation of the reducing agent and the improvement in the dispersibility, while suppressing and decreasing the increase in the exhaust resistance which would be otherwise caused by the arrangement of thedispersion member 5. - An example, in which the annular plate member is used as the
dispersion member 5, is described in this embodiment. However, as shown inFIG. 5 , it is also allowable to use an annular plate member provided with a plurality of through-holes 51. In this arrangement, when the diameters of the through-holes 51 are formed to be smaller than the particle diameter of the coarse reducing agent, a part of the exhaust gas and the reducing agent converted into fine particle as a result of the collision with thedispersion member 5 pass through the through-holes 51. Therefore, it is possible to further decrease the exhaust resistance resulting from thedispersion member 5. - When an annular plate member is used as the
dispersion member 5, it is also allowable that protrusions and recesses are provided on the surface disposed on the upstream side. In this case, the reducing agent in the liquid phase, which is adhered to thedispersion member 5, is easily vaporized. As for the method for providing the protrusions and recesses on the surface of thedispersion member 5, as shown inFIG. 6 , it is possible to use a method in which a plate member having a wavy cross section is formed to have an annular shape. When a swirl injector, which injects the reducing agent while swirling the reducing agent in a spiral form, is used as the reducingagent addition valve 4, if the protrusions and recesses are provided on the surface of thedispersion member 5, then the fine particle formation is facilitated when the coarse reducing agent collides with thedispersion member 5. - As shown in
FIG. 7 , as for thedispersion member 5, it is also possible to use a member in which a plurality of plate members (blades or vanes) 53 are arranged in a spiral form on the inner circumferential surface of acylindrical member 52. In this arrangement, the plurality ofblades 53 are arranged so that they are not brought in contact with each other. According to thedispersion member 5 as described above, the coarse reducing agent and the exhaust gas, which collide with the blades of thedispersion member 5, swirl in a spiral form. As a result, the mixing is facilitated between the exhaust gas and the reducing agent converted into fine particles by making collision with the blades. Further, the plurality ofblades 53 are arranged while providing gaps therebetween. Therefore, the increase in the exhaust resistance caused by thedispersion member 5 can be suppressed to be smaller as well. - As for the
dispersion member 5, as shown inFIG. 8 , it is also possible to use a member in which an annular plate member is formed to have a tapered form. In this arrangement, the portion of the plate member, which is disposed inwardly in the radial direction, is positioned on the downstream side in the exhaust gas flow direction as compared with the portion which is disposed outwardly in the radial direction. According to the construction as described above, the angle of collision between thedispersion member 5 and the exhaust gas is smaller than the right angle. Therefore, the increase in the exhaust resistance caused by thedispersion member 5 can be further suppressed to be small. - As for the
dispersion member 5, as shown inFIG. 9 , it is also possible to use a member in which an upstream side end portion of a cylindrical member protrudes outwardly in the radial direction. In this case, the exhaust gas, which makes a detour to avoid thedispersion member 5, generates the back step flow as shown by the arrow inFIG. 9 . Therefore, the agitation is facilitated between the exhaust gas and the reducing agent. As a result, the exhaust gas and the reducing agent are mixed with each other uniformly. - When a multi-hole type injection valve, in which a plurality of injection holes are arranged in an annular form, is used as the reducing
agent addition valve 4, as shown inFIG. 10 , the reducing agent, which is injected from the respective injection holes, forms a full cone-shaped (cone-shaped) or hollow cone-shaped (shape of hollow cone) spray. Accordingly, when the multi-hole type injection valve is used as the reducingagent addition valve 4, it is also appropriate to adopt a construction as shown inFIG. 11 as adispersion member 5. Thedispersion member 5 shown inFIG. 11 is the member in which a plurality ofplate members 55 are provided on the inner circumferential surface of anannular member 54. Therespective plate members 55 are arranged on the flight routes of the reducing agent injected from the respective injection holes 22. Further, through-holes 56 are formed at portions overlapped with the flight routes of the fine particle reducing agent in therespective plate members 55. According to thedispersion member 5 as described above, only the coarse reducing agent, which is included in the reducing agent injected from the respective injection holes 22, can be allowed to collide with theplate members 55. As a result, it is possible to realize the fine particle formation of the coarse reducing agent and the improvement in the dispersibility thereof, while suppressing and decreasing the increase in the exhaust resistance caused by thedispersion member 5. In the example shown inFIG. 11 , thedispersion member 5 is provided with the fourplate members 55. However, the number of theplate members 55 may be either not more than three or not less than five. In short, it is appropriate that the same number of the plate members as the number of the injection holes of the reducingagent addition valve 4 are provided. - When a slit type injection valve, which has an injection hole having a rectangular cross section, is used as the reducing
agent addition valve 4, as shown inFIG. 12 , the reducing agent, which is injected from the reducingagent addition valve 4, forms a sectoral spray. In this arrangement, the coarse reducing agent tends to gather at the both ends of the sectoral spray (A shown inFIG. 12 ). Accordingly, when the slit type injection valve is used as the reducingagent addition valve 4, it is also allowable to adopt a construction as shown inFIG. 13 as thedispersion member 5. Thedispersion member 5 shown inFIG. 13 is the member in whichplate members 57 are provided at opposing two positions on the inner circumferential surface of anannular member 54. According to thedispersion member 5 as described above, only the coarse reducing agent, which is included in the reducing agent injected from the reducingagent addition valve 4, can be allowed to collide with theplate member 57. As a result, it is possible to realize the fine particle formation of the coarse reducing agent and the improvement in the dispersibility thereof, while suppressing and decreasing the increase in the exhaust resistance caused by thedispersion member 5. - In the embodiment of the present invention, the example has been described, in which the reducing
agent addition valve 4 is arranged so that the axial direction of the reducingagent addition valve 4 is parallel to the flow direction of the exhaust gas. However, as shown inFIG. 14 , the reducingagent addition valve 4 may be arranged so that the axial direction of the reducingagent addition valve 4 obliquely intersects the flow direction of the exhaust gas. In this case, as shown inFIG. 14 , thedispersion member 5 may be arranged perpendicularly to the flow direction of the exhaust gas on the flight route of the coarse reducing agent (A shown inFIG. 14 ). Further, as shown inFIG. 15 , thedispersion member 5 may be arranged obliquely with respect to the flow direction of the exhaust gas on the flight route of the coarse reducing agent (A shown inFIG. 15 ). In short, thedispersion member 5 may be arranged in any manner provided that thedispersion member 5 is disposed on the flight route of the coarse reducing agent. - Next, an explanation will be made on the basis of
FIGS. 16 to 21 about a second embodiment of the exhaust gas purification apparatus for the internal combustion engine according to the present invention. In this section, the construction different from that of the first embodiment described above will be explained, and the same or equivalent construction will be omitted from the explanation. - The difference between the first embodiment described above and this embodiment resides in that the coarse reducing agent, which is injected from the reducing
agent addition valve 4, is allowed to collide with the dispersion member 5 a plurality of times. -
FIG. 16 shows a construction of adispersion member 5 in this embodiment. With reference toFIG. 16 , thedispersion member 5 is provided with acylindrical member 58, and an annular protrudingportion 59 which protrudes inwardly in the radial direction from the end portion on the downstream side of thecylindrical member 58. Thecylindrical member 58 and the protrudingportion 59 are arranged on the flight route of the coarse reducing agent injected from the reducingagent addition valve 4. - According to the
dispersion member 5 constructed as described above, the coarse reducing agent collides with the inner wall surface of the protrudingportion 59 after colliding with the inner wall surface of thecylindrical member 58 in some cases, and the coarse reducing agent collides with the inner wall surface of thecylindrical member 58 after colliding with the inner wall surface of the protrudingportion 59 in other cases. As a result, the conversion into fine particles (fine particle formation) of the coarse reducing agent is further facilitated. Further, the coarse reducing agent stays in the space surrounded by thecylindrical member 58 and the protrudingportion 59. Therefore, it is possible to facilitate the vaporization and the hydrolysis of the coarse reducing agent, and it is also possible to facilitate the mixing with the exhaust gas. - In the example shown in
FIG. 16 , the protrudingportion 59 protrudes perpendicularly to the cylindrical member 58 (in parallel to the radial direction of the exhaust gas passage 2). However, as shown inFIG. 17 , the protrudingportion 59 may protrude while being inclined to the upstream side in the flow direction of the exhaust gas. According to the construction as described above, the coarse reducing agent more reliably collides with both of the inner wall surface of thecylindrical member 58 and the inner wall surface of the protrudingportion 59, and the coarse reducing agent easily stays in the space surrounded by thecylindrical member 58 and the protrudingportion 59. Therefore, the conversion of the coarse reducing agent into the fine particles is further facilitated, and the vaporization and the hydrolysis are further facilitated. In another arrangement, the protrudingportion 59 may protrude outwardly in the radial direction from the end portion on the downstream side of thecylindrical member 58. - In this embodiment, the example has been described, in which the reducing
agent addition valve 4 is arranged so that the axial direction of the reducingagent addition valve 4 is parallel to the flow direction of the exhaust gas. However, as shown inFIG. 18 , the reducingagent addition valve 4 may be arranged so that the axial direction of the reducingagent addition valve 4 is perpendicular to the flow direction of the exhaust gas. - In this arrangement, a
dispersion member 5 may be provided with a plurality ofcollision members 500 arranged in the radial direction of theexhaust gas passage 2. As shown inFIG. 19 , each of thecollision members 500 is constructed by a plate member provided with a plurality of through-holes 501. In each of thecollision members 500, any through-hole 501 is not provided at aportion 502 overlapped with the flight route of the coarse reducing agent (theportion 502 is hereinafter referred to as “non-penetrating portion 502”). - According to the construction shown in
FIG. 19 , the fine particle reducing agent passes through the through-holes of thecollision members 500, and the coarse reducing agent collides with thenon-penetrating portions 502 of the plurality of collision members 500 a plurality of times, the fine particle reducing agent and the coarse reducing agent being included in the reducing agent injected from the reducingagent addition valve 4. As a result, it is possible to realize the improvement in the dispersibility and the fine particle formation of the coarse reducing agent, and it is also possible to obtain a uniform concentration distribution of the reducing agent in the radial direction of theexhaust gas passage 2. - As shown in
FIG. 20 , the plurality ofcollision members 500 may be arranged on only the flight route of the coarse reducing agent. In this arrangement, as for each of thecollision members 500, it is possible to use a flat plate, a cylindrical member, or a member obtained by forming a semicylindrical member to have an annular form. According to the construction as described above, the coarse reducing agent can be allowed to collide with the plurality ofcollision members 500. - In the exemplary arrangement shown in
FIG. 18 , when the reducingagent addition valve 4 is a slit-shaped injection valve, thedispersion member 5 may be a plate-shapedcollision member 500 provided with a plurality of through-holes 501 as shown inFIG. 21 , wherein thedispersion member 5 is the member in whichnon-penetrating portions 502 are formed at positions corresponding to the both ends of the sectoral spray. -
-
- 1: internal combustion engine
- 2: exhaust gas passage
- 3: catalyst casing
- 4: reducing agent addition valve
- 5: dispersion member
- 22: respective injection holes
- 30: selective reduction catalyst
- 31: ammonia oxidation catalyst
- 40: pump,
- 41: reducing agent tank
- 50: support shaft
- 51: through-hole
- 52: cylindrical member
- 53: blade
- 54: annular member
- 55: plate member
- 56: through-hole
- 57: plate member
- 58: cylindrical member
- 59: protruding portion
- 500: collision member
- 501: through-hole
- 502: non-penetrating portion
Claims (7)
1. An exhaust gas purification apparatus for an internal combustion engine, comprising:
an exhaust gas purification catalyst which is arranged in an exhaust gas passage of the internal combustion engine;
a reducing agent addition valve which adds a reducing agent to an exhaust gas allowed to flow upstream from the exhaust gas purification catalyst; and
a dispersion member which is a member for allowing the reducing agent added from the reducing agent addition valve to collide therewith and which is arranged on a flight route of a coarse reducing agent, the coarse reducing agent being included in the reducing agent added from the reducing agent addition valve and the coarse reducing agent being the reducing agent having relatively large particle diameters.
2. The exhaust gas purification apparatus for the internal combustion engine according to claim 1 , wherein:
the reducing agent addition valve is an injection valve for forming a cone-shaped spray; and
the dispersion member is arranged on a route along which a circumferential edge portion of the cone-shaped spray flies.
3. The exhaust gas purification apparatus for the internal combustion engine according to claim 2 , wherein the dispersion member is a member having a protruding portion which is formed on one end surface of a cylindrical member and which extends in a radial direction.
4. The exhaust gas purification apparatus for the internal combustion engine according to claim 2 , wherein the dispersion member is a plate member which is formed to have an annular form.
5. The exhaust gas purification apparatus for the internal combustion engine according to claim 4 , wherein protrusions and recesses are formed on a surface of the plate member.
6. The exhaust gas purification apparatus for the internal combustion engine according to claim 4 , wherein a plurality of through-holes are provided through the plate member.
7. The exhaust gas purification apparatus for the internal combustion engine according to claim 2 , wherein the dispersion member is a member in which a plurality of plate members are arranged in an annular form.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2011/069189 WO2013027295A1 (en) | 2011-08-25 | 2011-08-25 | Exhaust gas purification device for internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
US20140216015A1 true US20140216015A1 (en) | 2014-08-07 |
Family
ID=47746075
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/240,527 Abandoned US20140216015A1 (en) | 2011-08-25 | 2011-08-25 | Exhaust gas purification apparatus for internal combustion engine |
Country Status (5)
Country | Link |
---|---|
US (1) | US20140216015A1 (en) |
EP (1) | EP2749748A4 (en) |
JP (1) | JP5835330B2 (en) |
CN (1) | CN103748330A (en) |
WO (1) | WO2013027295A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150198073A1 (en) * | 2014-01-13 | 2015-07-16 | Caterpillar, Inc. | Exhaust aftertreatment system with in-elbow reductant injection |
US20160201593A1 (en) * | 2015-01-14 | 2016-07-14 | Ford Global Technologies, Llc | Method and system for fuel injection |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9334781B2 (en) | 2013-05-07 | 2016-05-10 | Tenneco Automotive Operating Company Inc. | Vertical ultrasonic decomposition pipe |
US9352276B2 (en) | 2013-05-07 | 2016-05-31 | Tenneco Automotive Operating Company Inc. | Exhaust mixing device |
US9364790B2 (en) | 2013-05-07 | 2016-06-14 | Tenneco Automotive Operating Company Inc. | Exhaust mixing assembly |
JP6167031B2 (en) * | 2013-12-06 | 2017-07-19 | 株式会社Soken | Exhaust gas purification device |
JP2017172332A (en) * | 2016-03-18 | 2017-09-28 | いすゞ自動車株式会社 | engine |
JP6680621B2 (en) * | 2016-06-02 | 2020-04-15 | 株式会社Soken | Exhaust gas purification device for internal combustion engine |
JP2018150851A (en) * | 2017-03-10 | 2018-09-27 | いすゞ自動車株式会社 | Urea scr system of engine |
JP2019127880A (en) * | 2018-01-24 | 2019-08-01 | フタバ産業株式会社 | Agitator |
JP2020112072A (en) * | 2019-01-10 | 2020-07-27 | いすゞ自動車株式会社 | Mixing member, exhaust emission control device, and vehicle |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6539708B1 (en) * | 1998-02-16 | 2003-04-01 | Siemens Aktiengesellscahft | Metering system |
US20070144158A1 (en) * | 2005-12-22 | 2007-06-28 | Girard James W | Exhaust dispersion device |
US20070245718A1 (en) * | 2006-04-24 | 2007-10-25 | Cheng C R | Exhaust aftertreatment mixer with stamped muffler flange |
US20080267780A1 (en) * | 2007-04-25 | 2008-10-30 | J. Eberspaecher Gmbh & Co. Kg | Mixing and/or evaporation device and respective manufacturing method |
US20090019843A1 (en) * | 2007-07-17 | 2009-01-22 | Ford Global Technologies, Llc | Approach for Delivering a Liquid Reductant into an Exhaust Flow of a Fuel Burning Engine |
US20090266064A1 (en) * | 2008-04-25 | 2009-10-29 | Tenneco Automotive Operating Company Inc. | Exhaust gas additive/treatment system and mixer for use therein |
US20100083643A1 (en) * | 2007-03-12 | 2010-04-08 | Miwa Hayashi | Exhaust gas purification apparatus for internal combustion engine |
US20100132344A1 (en) * | 2007-05-04 | 2010-06-03 | Axel Peters | Device and Method for Metering Liquid Pollutant-Reducing Media into an Exhaust Gas Duct of an Internal Combustion Engine |
US20110167810A1 (en) * | 2010-01-12 | 2011-07-14 | Lebas Jerome | Flow device for exhaust treatment system |
US20110239631A1 (en) * | 2010-04-05 | 2011-10-06 | Caterpillar Inc. | Ring Reductant Mixer |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000038975A (en) * | 1999-08-02 | 2000-02-08 | Hitachi Ltd | Fuel injection valve |
JP2006207395A (en) * | 2005-01-25 | 2006-08-10 | Denso Corp | Exhaust emission control device |
JP4708320B2 (en) * | 2006-12-01 | 2011-06-22 | ボッシュ株式会社 | NOX purification device |
JP2009041370A (en) * | 2007-08-06 | 2009-02-26 | Bosch Corp | Exhaust emission control device of internal combustion engine |
JP4375465B2 (en) * | 2007-09-14 | 2009-12-02 | トヨタ自動車株式会社 | Additive dispersion plate structure in exhaust passage |
JP2011058478A (en) * | 2009-09-14 | 2011-03-24 | Toyota Central R&D Labs Inc | Reducing agent supply device, exhaust emission system equipped with the same, and method for supplying reducing agent |
-
2011
- 2011-08-25 WO PCT/JP2011/069189 patent/WO2013027295A1/en active Application Filing
- 2011-08-25 CN CN201180072980.0A patent/CN103748330A/en active Pending
- 2011-08-25 EP EP11871105.0A patent/EP2749748A4/en not_active Withdrawn
- 2011-08-25 JP JP2013529827A patent/JP5835330B2/en not_active Expired - Fee Related
- 2011-08-25 US US14/240,527 patent/US20140216015A1/en not_active Abandoned
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6539708B1 (en) * | 1998-02-16 | 2003-04-01 | Siemens Aktiengesellscahft | Metering system |
US20070144158A1 (en) * | 2005-12-22 | 2007-06-28 | Girard James W | Exhaust dispersion device |
US20070245718A1 (en) * | 2006-04-24 | 2007-10-25 | Cheng C R | Exhaust aftertreatment mixer with stamped muffler flange |
US20100083643A1 (en) * | 2007-03-12 | 2010-04-08 | Miwa Hayashi | Exhaust gas purification apparatus for internal combustion engine |
US20080267780A1 (en) * | 2007-04-25 | 2008-10-30 | J. Eberspaecher Gmbh & Co. Kg | Mixing and/or evaporation device and respective manufacturing method |
US20100132344A1 (en) * | 2007-05-04 | 2010-06-03 | Axel Peters | Device and Method for Metering Liquid Pollutant-Reducing Media into an Exhaust Gas Duct of an Internal Combustion Engine |
US20090019843A1 (en) * | 2007-07-17 | 2009-01-22 | Ford Global Technologies, Llc | Approach for Delivering a Liquid Reductant into an Exhaust Flow of a Fuel Burning Engine |
US20090266064A1 (en) * | 2008-04-25 | 2009-10-29 | Tenneco Automotive Operating Company Inc. | Exhaust gas additive/treatment system and mixer for use therein |
US20110167810A1 (en) * | 2010-01-12 | 2011-07-14 | Lebas Jerome | Flow device for exhaust treatment system |
US20110239631A1 (en) * | 2010-04-05 | 2011-10-06 | Caterpillar Inc. | Ring Reductant Mixer |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150198073A1 (en) * | 2014-01-13 | 2015-07-16 | Caterpillar, Inc. | Exhaust aftertreatment system with in-elbow reductant injection |
US20160201593A1 (en) * | 2015-01-14 | 2016-07-14 | Ford Global Technologies, Llc | Method and system for fuel injection |
US9915219B2 (en) * | 2015-01-14 | 2018-03-13 | Ford Global Technologies, Llc | Method and system for fuel injection |
Also Published As
Publication number | Publication date |
---|---|
JPWO2013027295A1 (en) | 2015-03-05 |
WO2013027295A1 (en) | 2013-02-28 |
EP2749748A4 (en) | 2015-01-21 |
CN103748330A (en) | 2014-04-23 |
JP5835330B2 (en) | 2015-12-24 |
EP2749748A1 (en) | 2014-07-02 |
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