WO2010089924A1 - 排気浄化装置 - Google Patents
排気浄化装置 Download PDFInfo
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- WO2010089924A1 WO2010089924A1 PCT/JP2009/069050 JP2009069050W WO2010089924A1 WO 2010089924 A1 WO2010089924 A1 WO 2010089924A1 JP 2009069050 W JP2009069050 W JP 2009069050W WO 2010089924 A1 WO2010089924 A1 WO 2010089924A1
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- exhaust
- processing unit
- communication pipe
- reducing agent
- exhaust gas
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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
- F01N3/0821—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with particulate filters
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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
- F01N3/24—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9459—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts
- B01D53/9477—Removing one or more of nitrogen oxides, carbon monoxide, or hydrocarbons by multiple successive catalytic functions; systems with more than one different function, e.g. zone coated catalysts with catalysts positioned on separate bricks, e.g. exhaust systems
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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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
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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
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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]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/404—Nitrogen oxides other than dinitrogen oxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation 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
- 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
- F01N2240/18—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 an adsorber or absorber
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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
- 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
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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
- F01N2250/00—Combinations of different methods of purification
- F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
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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
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/30—Tubes with restrictions, i.e. venturi or the like, e.g. for sucking air or measuring mass flow
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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
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/08—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for heavy duty applications, e.g. trucks, buses, tractors, locomotives
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
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- 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 the technology of an exhaust emission control device for a diesel engine.
- Exhaust gas discharged from a diesel engine contains a lot of particulate matter represented by soot and nitrogen oxides represented by nitric oxide.
- a particulate matter filtration device that filters exhaust gas using a filter carrier, and as a means for removing nitrogen oxides, after supplying urea water to the exhaust gas, a reduction catalyst carrier is used.
- Nitrogen oxide reduction apparatuses that reduce nitrogen oxides are known.
- the present invention is compact and has a simple structure, but can uniformly mix an appropriate amount of urea water into the exhaust gas, and biases the exhaust gas containing urea water to the reduction catalyst carrier constituting the nitrogen oxide purification device.
- An object of the present invention is to provide an exhaust purification device that can be introduced without any problems.
- a first aspect of the present invention is a substantially cylindrical exhaust passage provided with a filter carrier in an exhaust purification device provided in an exhaust passage of a diesel engine, and mainly removes particulate matter from the exhaust of the diesel engine.
- a first treatment part, a substantially cylindrical exhaust passage provided with a reduction catalyst carrier, a second treatment part for mainly reducing nitrogen oxides from the exhaust gas that has passed through the first treatment part, and the first treatment A communication pipe that guides exhaust gas from an exhaust outlet provided on the peripheral surface of the unit to an exhaust inlet provided on the peripheral surface of the second processing unit, and a reducing agent that supplies the reducing agent to the exhaust gas to reduce nitrogen oxides
- the side is exhausted from the first processing section Is provided so as to be along the outer peripheral surface of the first processing unit and passes between the first processing unit and the second processing unit closest to each other, and the downstream side thereof is
- the communication pipe has a central axis at a connection portion with the first processing section on the upstream side thereof that does not intersect the central axis of the first processing section. It is provided as follows.
- the communication pipe has a central axis at a connection portion with the second processing section on the downstream side that does not intersect the central axis of the second processing section. It is provided as follows.
- a fourth aspect of the present invention is the engine according to the first aspect, wherein the communication pipe has a reduced diameter portion on the downstream side of the reducing agent supply portion.
- a fifth aspect of the present invention is the engine according to the fourth aspect, wherein the communication pipe has the reduced diameter portion disposed at a portion where the first processing portion and the second processing portion are closest to each other.
- the engine further includes an auxiliary reducing agent supply unit that supplies a reducing agent to the exhaust gas in order to reduce nitrogen oxides, and the reducing agent supply unit includes the communication device.
- the auxiliary reducing agent supply unit is provided on the downstream side of the communication pipe.
- the exhaust emission control device can be made small and simple, and the mixing of the exhaust gas and the urea water supplied thereto can be promoted.
- the exhaust purification device can be made small and simple, and it is possible to promote the mixing of the exhaust gas and the urea water supplied thereto even during the low output operation of the diesel engine. Become.
- the exhaust gas purification device small and have a simple structure and to promote the mixing of the exhaust gas and the urea water supplied thereto. Further, exhaust gas can be uniformly introduced into the reduction catalyst carrier by the swirl flow without any bias.
- the exhaust gas purification device small and simple, and further promote the mixing of the exhaust gas and the urea water supplied thereto. Further, exhaust gas can be uniformly introduced into the reduction catalyst carrier by the swirl flow without any bias.
- the fifth aspect of the present invention it is possible to further reduce the size of the exhaust gas purification device and further promote the mixing of the exhaust gas and the urea water supplied thereto. Further, exhaust gas can be uniformly introduced into the reduction catalyst carrier by the swirl flow without any bias.
- the exhaust gas purification device can be made small and simple, and the exhaust gas and the urea water supplied thereto can be mixed regardless of the operation state of the diesel engine. Further, an appropriate amount of urea water corresponding to the amount of nitrogen oxide discharged can be mixed with the exhaust gas and introduced into the reduction catalyst carrier.
- FIG. 1 is a side cross-sectional view of an exhaust emission control device according to a first embodiment of the present invention.
- A The top view of the exhaust gas purification apparatus which concerns on 2nd embodiment of this invention.
- B Side view. Side surface sectional drawing of the exhaust gas purification apparatus which concerns on 2nd embodiment of this invention.
- A The top view of the exhaust gas purification apparatus which concerns on 3rd embodiment of this invention.
- B Side view. The figure which shows supply of the urea water to exhaust_gas
- FIG. 1 (A) is a plan view of the exhaust purification device 1 according to the first embodiment of the present invention
- FIG. 1 (B) is a side view thereof
- FIG. 2 is a side sectional view in the first embodiment.
- the arrow in a figure has shown the flow of exhaust_gas
- an exhaust purification device 1 is provided in an exhaust passage of a diesel engine, and includes a first processing unit 10 that is mainly a particulate matter filtering device and a second processing unit that is a nitrogen oxide reduction device. 20, a communication pipe 30 that guides exhaust gas from the first processing unit 10 to the second processing unit 20, and a reducing agent supply unit 40 that is provided in the communication pipe 30 and supplies urea water S to the exhaust gas.
- the exhaust discharged from the diesel engine is first guided to the first processing unit 10 to remove particulate matter. Then, the exhaust gas from which the particulate matter has been removed is guided to the second processing unit 20 disposed in parallel with the first processing unit 10 through the communication pipe 30. At this time, when the appropriate amount of urea water S is supplied to the exhaust gas from the reducing agent supply unit 40 provided in the communication pipe 30, the nitrogen oxide reduction reaction is performed in the second processing unit 20. Thus, the exhaust gas from which the particulate matter is removed and the nitrogen oxides are reduced is discharged to the atmosphere through the tail pipe 50.
- the first processing unit 10 includes a cylindrical first case 15, an oxidation catalyst carrier (hereinafter referred to as “DOC”) 12 formed by supporting a catalyst such as platinum on a base material such as silicon carbide, and the like.
- a filter carrier (hereinafter referred to as “DPF”) 13 is formed of a base material such as silicon carbide and filters exhaust gas passing therethrough.
- the DOC 12 and the DPF 13 are provided in the middle of the exhaust passage formed inside the first case 15, and are arranged so that the DOC 12 is located on the upstream side and the DPF 13 is located on the downstream side.
- the first processing unit 10 is configured in a straight line with the direction in which the exhaust gas flows in the exhaust passage as a longitudinal direction.
- An exhaust inlet is formed on the upstream side of the first processing unit 10, and the exhaust discharged from the diesel engine can be introduced into the inlet chamber 11 of the first processing unit 10.
- An exhaust outlet is formed on the downstream side of the first processing unit 10, and the exhaust that has passed through the DOC 12 and the DPF 13 in this order from the inlet chamber 11 can be discharged to the communication pipe 30 from the exhaust outlet provided in the outlet chamber 14. .
- DOC12 oxidizes SOF (organic soluble component) that constitutes CO (carbon monoxide), HC (hydrocarbon), and particulate matter (hereinafter referred to as “PM”) in exhaust discharged from a diesel engine. To be removed. Further, NO (nitrogen monoxide) contained in the exhaust gas of the diesel engine is oxidized to be changed to NO 2 (nitrogen dioxide).
- SOF organic soluble component
- HC hydrocarbon
- PM particulate matter
- the DPF 13 filters exhaust gas by collecting soot that constitutes PM, and oxidizes and removes the collected soot.
- DPF 13 using silicon carbide as a base material is used, and soot contained in the exhaust is collected when the exhaust passes through fine holes formed in DPF 13.
- the soot collected in this manner is oxidized by oxygen contained in the exhaust gas and NO 2 generated in the DOC 12 on the condition that the exhaust gas temperature allows the oxidation reaction to proceed.
- the 1st process part 10 of this embodiment shall collect and oxidize PM contained in exhaust_gas
- the DPF 13 may be one using cordierite as a base material, one formed by stacking heat-resistant steel, or the like, and is not limited in terms of material or structure.
- the second processing unit 20 is mainly a cylindrical second case 25, and a reduction catalyst carrier (hereinafter referred to as "SCR carrier") 22 formed by supporting a catalyst such as zeolite on a base material such as cordierite.
- DOC23 formed by supporting a catalyst such as platinum on a substrate such as silicon carbide.
- the SCR carrier 22 and the DOC 23 are provided in the middle of the exhaust passage formed inside the second case 25, and are arranged so that the SCR carrier 22 is located on the upstream side and the DOC 23 is located on the downstream side.
- the 2nd process part 20 is comprised as a SCR system by the reducing agent supply part 40 mentioned later, the control apparatus, supply pump, etc. which are not shown in figure.
- the second processing unit 20 is configured in a straight line with the exhaust flow direction in the exhaust passage as a longitudinal direction.
- An exhaust inlet is formed on the upstream side of the second processing unit 20, and the exhaust guided by the communication pipe 30 can be introduced into the inlet chamber 21 of the second processing unit 20.
- An exhaust outlet is formed on the downstream side of the second processing unit 20, and the exhaust that has passed through the SCR carrier 22 and the DOC 23 in order from the inlet chamber 21 can be discharged to the tail pipe 50 from the exhaust outlet provided in the outlet chamber 24. Is done.
- the SCR carrier 22 is for reducing nitrogen oxides contained in the exhaust gas using ammonia as a reducing agent.
- Ammonia is generated by hydrolysis of urea water S supplied to the exhaust gas from a reducing agent supply unit 40 described later.
- the SCR carrier 22 uses this ammonia to convert nitrogen oxides into N 2 and H 2 by the following reduction reaction. Change to O. 6NO + 4NH 3 ⁇ 5N 2 + 6H 2 O 4NO + 4NH 3 + O 2 ⁇ 4N 2 + 6H 2 O 6NO 2 + 8NH 3 ⁇ 7N 2 + 12H 2 O 2NO 2 + 4NH 3 + O 2 ⁇ 3N 2 + 6H 2 O NO + NO 2 + 2NH 3 ⁇ 2N 2 + 3H 2 O
- DOC 23 arranged on the downstream side of the SCR carrier 22 oxidizes excess ammonia in the reduction reaction in the SCR carrier 22 to render it harmless, and prevents release of ammonia into the atmosphere.
- the second processing unit 20 of the present embodiment reduces nitrogen oxides using ammonia generated by hydrolysis of the urea water S as a reducing agent.
- ammonia generated by hydrolysis of the urea water S
- hydrocarbon fuel is used as exhaust gas.
- a so-called occlusion reduction catalyst that reduces nitrogen oxide supplied and adsorbed on the catalyst carrier may be used.
- the first processing unit 10 and the second processing unit 20 are provided side by side on the same plane, and are arranged in parallel at a predetermined interval.
- the lengths in the longitudinal direction of the first processing unit 10 and the second processing unit 20 are set to be substantially the same, and at least the exhaust outlet provided in the outlet chamber 14 of the first processing unit 10 and the inlet chamber 21 of the second processing unit 20.
- the exhaust inlet provided in is disposed on the same plane perpendicular to the central axis of the first processing unit 10 and the second processing unit 20.
- the exhaust outlet of the first processing unit 10 is disposed on the side of the first case 15 facing the second processing unit 20.
- the exhaust inlet of the second processing unit 20 is disposed on the side of the second case 25 facing the first processing unit 10. That is, the exhaust outlet of the first processing unit 10 and the exhaust inlet of the second processing unit 20 are arranged to face each other.
- the exhaust outlet of the first processing unit 10 and the exhaust inlet of the second processing unit 20 are in relation to the central axes of the first processing unit 10 and the second processing unit 20 in a side view, as shown in FIG. They are not positioned on a straight line that is orthogonal to each other, and are provided so that their vertical positions are shifted from each other.
- the communication pipe 30 is a circular pipe-shaped member that guides the exhaust gas that has passed through the DOC 12 and the DPF 13 constituting the first processing unit 10 to the second processing unit 20.
- the communication pipe 30 is provided so as to connect the exhaust outlet of the first processing unit 10 and the exhaust inlet of the second processing unit 20 while being bent between the first processing unit 10 and the second processing unit 20.
- the space is formed between the one processing unit 10 and the second processing unit 20.
- the inner diameter of the communication pipe 30 is set to a constant value that is smaller than the diameters of the first case 15 and the second case 25.
- the communication pipe 30 has an upstream side in a tangential direction of the first processing unit 10 from an exhaust outlet provided in the outlet chamber 14 of the first processing unit 10, and at a connection portion with the first processing unit 10.
- the central axis is shifted and extended so as not to intersect the central axis of the first processing unit 10.
- the communication pipe 30 is bent so as to follow the outer peripheral surface of the first processing unit 10, and the midway part thereof is formed so as to pass while the first processing unit 10 and the second processing unit 20 are closest to each other.
- the downstream side of the communication pipe 30 is bent along the outer peripheral surface of the second processing unit 20, is a tangential direction of the second processing unit 20, and its central axis is the central axis of the second processing unit 20. And is connected to an exhaust inlet provided in the inlet chamber 21 of the second processing unit 20. That is, as shown in FIG. 2, the communication pipe 30 forms an approximately S-shaped exhaust passage in a side view.
- the reducing agent supply unit 40 is provided in the communication pipe 30 and supplies urea water S to the exhaust gas.
- the reducing agent supply unit 40 includes a nozzle or the like, is provided on the upstream side of the communication pipe 30, and is disposed in the vicinity of the exhaust outlet of the first processing unit 10.
- the supply amount of urea water S from the reducing agent supply unit 40 is controlled by a control device (not shown) according to the discharge amount of nitrogen oxides discharged from the diesel engine.
- the reducing agent supply unit 40 includes one that supplies the urea water S together with air using compressed air, and one that supplies only the urea water S by a pump, but the present invention is not limited to the structure and the like. Further, the supply direction of the urea water S with respect to the flow of exhaust gas is not limited.
- the communication pipe 30 is a pipe that is bent into a substantially S shape, thereby extending the distance in which the exhaust gas flows in the limited space between the first processing unit 10 and the second processing unit 20.
- the exhaust gas guided from the communication pipe 30 to the inlet chamber 21 of the second processing unit 20 is guided from the tangential direction of the second processing unit 20 along the inner wall of the cylindrical inlet chamber 21.
- a swirl flow R is generated in the inlet chamber 21.
- the upstream side of the communication pipe 30 does not cross the central axis of the first processing unit 10 with the central axis at the connection portion with the first processing unit 10 Therefore, when the exhaust gas flows from the outlet chamber 14 to the upstream side of the communication pipe 30, the turbulence T due to the drift is generated inside the communication pipe 30 to promote the mixing of the urea water S. It becomes possible to make it.
- FIG. 3A is a plan view of the exhaust purification device 1 according to the second embodiment
- FIG. 3B is a side view thereof
- FIG. 4 is a side sectional view in the second embodiment.
- the same members as those of the configuration of the first embodiment are denoted by the same reference numerals, and description will be made focusing on portions different from the configuration of the first embodiment.
- the configurations of the first processing unit 10 and the second processing unit 20 are the same as those of the first embodiment of the present invention described above.
- the communication pipe 30 is on the upstream side in the tangential direction of the first processing unit 10, and the central axis at the connection portion with the first processing unit 10 is the first.
- the one processing unit 10 is shifted and extended so as not to intersect the central axis.
- the middle part is formed so that it may pass while the 1st process part 10 and the 2nd process part 20 adjoin most.
- the downstream side of the communication pipe 30 is the tangential direction of the second processing unit 20 and is shifted to a position where the central axis does not intersect the central axis of the second processing unit 20, so that the inlet chamber of the second processing unit 20 21 communicates.
- the first processing unit 10 and the second processing unit 20 are arranged so as to be close to each other compared to the first embodiment, and the first processing unit 10 and the second processing unit 20 of the communication pipe 30 are arranged.
- the portion that passes between the closest portions is formed so that the cross-section of the exhaust passage is reduced in diameter. That is, as shown in FIG. 4, the communication pipe 30 has a reduced diameter portion 30 a in which the exhaust passage cross section is reduced in diameter in the middle portion located between the first processing portion 10 and the second processing portion 20. It is supposed to be.
- the reducing agent supply unit 40 is provided at least upstream of the reduced diameter portion 30a provided in the communication pipe 30 and supplies urea water S to the exhaust gas. In the present embodiment, it is arranged on the upstream side of the communication pipe 30 and in the vicinity of the exhaust outlet of the first processing unit 10.
- the exhaust purification device 1 can be further downsized.
- the exhaust gas supplied with the urea water S by the reducing agent supply unit 40 is expanded again after being contracted by the reduced diameter portion 30a, it is possible to further promote the evaporation and mixing of the urea water S. It becomes. Further, the reduced diameter portion 30a located between the first processing unit 10 and the second processing unit 20 can maintain a relatively high temperature because of less dissipation of heat received from the exhaust, and the urea water S It becomes possible to promote evaporation.
- the communication pipe 30 is located at a position where the central axis in the connection portion with the first processing unit 10 does not intersect the central axis of the first processing unit 10. Since the turbulence T caused by the drift is generated inside the communication pipe 30 and the turbulence T can be maintained on the upstream side of the reduced diameter portion 30a. Water S can be mixed.
- FIG. 5 (A) is a plan view of the exhaust emission control device 1 according to the third embodiment
- FIG. 5 (B) is a side view thereof
- FIG. 6 is a side cross-sectional view of the third embodiment, showing supply of urea water S to the exhaust during high-power operation of the diesel engine.
- FIG. 7 shows the supply of urea water S to the exhaust during low power operation of the diesel engine.
- the same members as those of the configuration of the first embodiment are denoted by the same reference numerals, and description will be made focusing on portions different from the configuration of the first embodiment.
- the configurations of the first processing unit 10 and the second processing unit 20 are the same as those of the first embodiment of the present invention described above.
- the communication pipe 30 has an upstream side in the tangential direction of the first processing unit 10, and the central axis at the connection portion with the first processing unit 10 is the first.
- the one processing unit 10 is shifted and extended so as not to intersect the central axis.
- the middle part is formed so that it may pass while the 1st process part 10 and the 2nd process part 20 adjoin most.
- the downstream side of the communication pipe 30 is the tangential direction of the second processing unit 20 and is shifted to a position where the central axis does not intersect the central axis of the second processing unit 20, so that the inlet chamber of the second processing unit 20 21 communicates.
- a reduced diameter portion 30a that reduces the cross section of the exhaust flow path is provided in the middle of the communication pipe 30 positioned between the first processing portion 10 and the second processing portion 20. It is done.
- an auxiliary reducing agent supply unit 41 that supplies urea water S to the exhaust is provided in the same manner as the reducing agent supply unit 40.
- the reducing agent supply unit 40 is provided in the vicinity of the exhaust outlet of the first processing unit 10 and upstream of the communication pipe 30, and the auxiliary reducing agent supply unit 41 is in the vicinity of the exhaust inlet of the second processing unit 20. And provided downstream of the communication pipe 30. That is, the reducing agent supply unit 40 and the auxiliary reducing agent supply unit 41 are respectively provided on the upstream side and the downstream side of the reduced diameter portion 30 a of the communication pipe 30.
- the auxiliary reducing agent supply unit 41 is configured by a nozzle or the like and supplies urea water S to the exhaust gas.
- the supply amount of the urea water S from the auxiliary reducing agent supply unit 41 is controlled by a control device (not shown) according to the discharge amount of nitrogen oxides discharged from the diesel engine.
- the auxiliary reducing agent supply unit 41 uses compressed air to supply urea water S together with air, or supplies only urea water S by a pump, but the present invention does not limit the structure or the like. Further, the supply direction of the urea water S with respect to the exhaust flow is not limited.
- the reducing agent supply unit 40 provided on the upstream side of the communication pipe 30 is for supplying the urea water S to the exhaust when the exhaust gas flow rate from the diesel engine is large, that is, at the time of high output operation. Further, during the transient operation, the urea water S is supplied from the reducing agent supply unit 40 unless the low output operation is maintained for a certain time.
- the auxiliary reducing agent supply unit 41 provided on the downstream side of the communication pipe 30 is for supplying the urea water S to the exhaust when the exhaust flow rate from the diesel engine is small for a certain period of time, that is, during low-power operation. .
- ammonia as a reducing agent is insufficient with respect to the discharge amount of nitrogen oxides, and the reduction reaction by the SCR carrier 22 may be insufficient.
- the urea water S is supplied to the exhaust gas from the auxiliary reducing agent supply unit 41 provided on the downstream side of the communication pipe 30. Is guided to the inlet chamber 21 of the second processing unit 20 without adhering to the wall surface of the communication pipe 30.
- an appropriate amount of urea water S corresponding to the emission amount of nitrogen oxides can be mixed into the exhaust gas and introduced into the SCR carrier 22.
- the amount of urea oxide S supplied is small because the amount of nitrogen oxide discharged is small, and the auxiliary reducing agent supply unit 41 provided on the downstream side of the communication pipe 30 is used. Even if the urea water S is supplied, sufficient mixing can be performed.
- FIG. 9A to 9C show side views of the exhaust purification device 1.
- the same members as those of the configuration of the first embodiment are denoted by the same reference numerals, and description will be made focusing on portions different from the configuration of the first embodiment.
- the configurations of the first processing unit 10 and the second processing unit 20 are the same as those of the first embodiment of the present invention described above.
- the communication pipe 30 is a circular tube-shaped member having a straight central axis, and is orthogonal to the central axes of the first processing unit 10 and the second processing unit 20. Are arranged in parallel with a predetermined distance from the straight line.
- One end of the communication pipe 30 is in the tangential direction of the first processing unit 10 and communicates with the outlet chamber 14 of the first processing unit 10 so that the central axis does not intersect the central axis of the first processing unit 10.
- the other end of the communication pipe 30 is in the tangential direction of the second processing unit 20, and the inlet chamber 21 of the second processing unit 20 does not intersect the central axis of the second processing unit 20.
- the communication pipe 30 is a circular tube-shaped member having a central axis as a straight line, and is orthogonal to the central axes of the first processing unit 10 and the second processing unit 20.
- the straight line and the central axis of the communication pipe 30 are arranged so as to intersect at a certain angle.
- One end of the communication pipe 30 is in the tangential direction of the first processing unit 10 and communicates with the outlet chamber 14 of the first processing unit 10 so that the central axis does not intersect the central axis of the first processing unit 10.
- the other end of the communication pipe 30 is in the tangential direction of the second processing unit 20, and the inlet chamber 21 of the second processing unit 20 does not intersect the central axis of the second processing unit 20.
- the reducing agent supply unit 40 is provided in at least the communication pipe 30 and supplies urea water S to the exhaust gas. In the present embodiment, it is provided near the exhaust outlet of the first processing unit 10 and upstream of the communication pipe 30.
- the exhaust emission control device 1 can have a simpler structure, promote the mixing of the exhaust gas and the urea water S supplied thereto, and suppress the deviation of the exhaust gas introduced into the SCR carrier 22. It becomes possible.
- further promotion of evaporation and mixing of the urea water S is provided by providing a reduced diameter portion 30a that reduces the cross section of the exhaust passage in the middle portion of the communication pipe 30 in FIGS. 9A and 9B. You can also plan.
- the communication pipe 30 is a tapered pipe formed so that the diameter of the exhaust passage section is gradually reduced from one end to the other end.
- the large-diameter side end of the communication tube 30 is communicated with the outlet chamber 14 of the first processing unit 10 so that the central axis does not intersect the central axis of the first processing unit 10, and the small-diameter side end of the communication tube 30.
- the reducing agent supply unit 40 is provided in at least the communication pipe 30 and supplies urea water S to the exhaust gas. In the present embodiment, it is provided near the exhaust outlet of the first processing unit 10 and upstream of the communication pipe 30.
- the flow of the exhaust gas is not hindered by the rapid contraction of the flow path cross section when the exhaust gas is introduced into the communication pipe 30, and the exhaust gas flow rate is increased from the small diameter side end portion and introduced into the second processing unit 20. Therefore, the swirl flow R in the inlet chamber 21 of the second processing unit 20 can be strengthened to suppress the mixing of the urea water S and the bias of the exhaust gas introduced into the SCR carrier 22.
- the present invention can be used for an exhaust purification device of a diesel engine.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
Description
10 第一処理部
12 酸化触媒担体(DOC)
13 フィルタ担体(DPF)
20 第二処理部
22 還元触媒担体(SCR担体)
23 酸化触媒担体(DOC)
30 連通管
30a 縮径部
40 還元剤供給部
41 補助還元剤供給部
6NO+4NH3→5N2+6H2O
4NO+4NH3+O2→4N2+6H2O
6NO2+8NH3→7N2+12H2O
2NO2+4NH3+O2→3N2+6H2O
NO+NO2+2NH3→2N2+3H2O
Claims (6)
- ディーゼルエンジンの排気通路に設けられる排気浄化装置において、
フィルタ担体が設けられる略円筒形状の排気通路であって、ディーゼルエンジンの排気から主に粒子状物質を除去する第一処理部と、
還元触媒担体が設けられる略円筒形状の排気通路であって、前記第一処理部を通過した排気から主に窒素酸化物を還元する第二処理部と、
前記第一処理部の周面に設けられた排気出口から前記第二処理部の周面に設けられた排気入口へ排気を導く連通管と、
窒素酸化物を還元するために還元剤を排気に供給する還元剤供給部と、を備え、
前記第一処理部と前記第二処理部とは、それぞれの排気出口と排気入口とを互いに対向する側に有して平行に設けられ、
前記連通管は、その上流側が前記第一処理部の排気出口から該第一処理部の外周面に沿うように設けられて前記第一処理部と前記第二処理部との最も近接する間を通り、その下流側が前記第二処理部の外周面に沿うようにして該第二処理部の排気入口まで設けられ、
前記還元剤供給部は、前記連通管に設けられることを特徴とする排気浄化装置。 - 前記連通管は、その上流側の前記第一処理部との接続部分における中心軸が前記第一処理部の中心軸に交差しないように設けられることを特徴とする請求項1に記載の排気浄化装置。
- 前記連通管は、その下流側の前記第二処理部との接続部分における中心軸が前記第二処理部の中心軸に交差しないように設けられることを特徴とする請求項1に記載の排気浄化装置。
- 前記連通管は、前記還元剤供給部よりも下流側に縮径部を有することを特徴とする請求項1に記載の排気浄化装置。
- 前記連通管は、第一処理部と第二処理部とが最も近接する部分に前記縮径部を配置することを特徴とする請求項4に記載の排気浄化装置。
- 窒素酸化物を還元するために還元剤を排気に供給する補助還元剤供給部をさらに備え、
前記還元剤供給部は、前記連通管の上流側に設けられ、
前記補助還元剤供給部は、前記連通管の下流側に設けられることを特徴とする請求項1に記載の排気浄化装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN200980155910.4A CN102301102B (zh) | 2009-02-03 | 2009-11-09 | 排气净化装置 |
US13/147,053 US8627653B2 (en) | 2009-02-03 | 2009-11-09 | Exhaust purification apparatus |
EP09839698.9A EP2395211A4 (en) | 2009-02-03 | 2009-11-09 | EXHAUST PURIFICATION APPARATUS |
KR1020117017860A KR101292627B1 (ko) | 2009-02-03 | 2009-11-09 | 배기 정화 장치 |
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JP2009023015A JP5308176B2 (ja) | 2009-02-03 | 2009-02-03 | 排気浄化装置 |
JP2009-023015 | 2009-02-03 |
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WO2010089924A1 true WO2010089924A1 (ja) | 2010-08-12 |
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PCT/JP2009/069050 WO2010089924A1 (ja) | 2009-02-03 | 2009-11-09 | 排気浄化装置 |
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US (1) | US8627653B2 (ja) |
EP (1) | EP2395211A4 (ja) |
JP (1) | JP5308176B2 (ja) |
KR (1) | KR101292627B1 (ja) |
CN (1) | CN102301102B (ja) |
WO (1) | WO2010089924A1 (ja) |
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JP2019132177A (ja) * | 2018-01-31 | 2019-08-08 | 日野自動車株式会社 | 排気浄化装置 |
KR102158731B1 (ko) * | 2019-02-18 | 2020-09-22 | 대지오토모티브 주식회사 | 배기 가스 정화 장치 |
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Also Published As
Publication number | Publication date |
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JP5308176B2 (ja) | 2013-10-09 |
EP2395211A1 (en) | 2011-12-14 |
KR101292627B1 (ko) | 2013-08-01 |
JP2010180726A (ja) | 2010-08-19 |
EP2395211A4 (en) | 2015-02-18 |
US20120023914A1 (en) | 2012-02-02 |
CN102301102A (zh) | 2011-12-28 |
CN102301102B (zh) | 2014-10-29 |
US8627653B2 (en) | 2014-01-14 |
KR20110110282A (ko) | 2011-10-06 |
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