US20110061374A1 - Exhaust gas treatment system - Google Patents
Exhaust gas treatment system Download PDFInfo
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- US20110061374A1 US20110061374A1 US12/879,280 US87928010A US2011061374A1 US 20110061374 A1 US20110061374 A1 US 20110061374A1 US 87928010 A US87928010 A US 87928010A US 2011061374 A1 US2011061374 A1 US 2011061374A1
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- injection valve
- exhaust gas
- urea water
- fuel
- treatment system
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
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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
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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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
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
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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
- F01N3/30—Arrangements for supply of additional air
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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
- F01N3/36—Arrangements for supply of additional fuel
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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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
- F01N2470/02—Tubes being perforated
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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
- F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
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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
- F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
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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
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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
- Y02T10/40—Engine management systems
Definitions
- the present invention relates to an exhaust gas treatment system, and more particularly to an exhaust gas treatment system including an injection valve for injecting urea water into exhaust gas and a selective catalytic reduction catalyst.
- a conventional exhaust gas treatment system is disclosed in Japanese Unexamined Patent Application Publication No. 2009-68424.
- the system includes an exhaust passage through which engine exhaust gas flows, a diesel particulate filter (DPF) provided in the exhaust passage, a urea SCR catalyst located downstream of the DPF in the exhaust passage as viewed in the direction of exhaust gas flow, and an ammonia oxidation catalyst located downstream of the urea SCR catalyst.
- the system further includes an injection nozzle for supplying urea water into the exhaust passage and a burner for accelerating activation of the SCR catalyst.
- the injection nozzle is provided between the DPF and the urea SCR catalyst, and the burner is provided upstream of the DPF in the exhaust passage.
- the combustion space of the burner needs to be provided in the exhaust passage separately from the mixing space for mixing urea water and exhaust gas.
- the combustion space needs to be provided with a structure or means for accelerating uniform mixing of fuel and exhaust gas
- the mixing space needs to be provided with a structure such as a mixer for uniform mixing of urea water and exhaust gas.
- the combustion space and the mixing space provided separately in the exhaust passage results in increased entire length of the exhaust passage. This leads not only to increased size of the system but also to increased heat loss by radiation in the exhaust passage.
- the present invention is directed to providing an exhaust gas treatment system that allows shortening of the entire length of an exhaust passage and also allows uniform mixing of urea water and combustion gas resulting from the combustion of fuel.
- an exhaust gas treatment system includes an exhaust passage through which exhaust gas from an internal combustion engine is allowed to flow, a selective catalytic reduction catalyst provided in the exhaust passage, a mixing chamber provided upstream of the selective catalytic reduction catalyst in the exhaust passage as viewed in the direction of exhaust gas flow, a fuel injection valve for injection of fuel, an air injection valve for injection of air, and a urea water injection valve for injection of urea water.
- the fuel injection valve, the air injection valve and the urea water injection valve each has an injection port directed to the mixing chamber.
- FIG. 1 is a schematic view of an engine equipped with an exhaust gas treatment system according to a first embodiment of the present invention
- FIG. 2 is an enlarged fragmentary sectional view of the exhaust gas treatment system of FIG. 1 ;
- FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2 ;
- FIG. 4 is a fragmentary sectional view of an exhaust gas treatment system according to a second embodiment of the present invention.
- FIG. 5 is a cross-sectional view taken along the line V-V of FIG. 4 .
- the exhaust gas treatment system is intended to be installed in a vehicle with a diesel engine as an internal combustion engine.
- the engine 11 which is equipped with an exhaust gas treatment system 10 , has plural cylinders 12 into which fuel is injected from respective fuel injectors 13 that are connected to a common rail 14 where fuel is stored at a high pressure.
- the engine 11 is operated under the control of an engine control unit (ECU) 15 .
- ECU 15 includes microprocessors for calculation, ROMs and RAMs for storing data and programs, and interfaces for connection to other devices.
- An intake passage 17 is connected to an intake manifold 16 of the engine 11 , and an exhaust passage 22 is connected to an exhaust manifold 21 of the engine 11 .
- the engine 11 is equipped with a turbocharger 18 that uses exhaust gas to increase intake pressure.
- the turbocharger 18 has a compressor 19 provided in the intake passage 17 and a turbine 20 provided in the exhaust passage 22 .
- Part of the exhaust passage 22 located downstream of the turbine 20 of the turbocharger 18 as viewed in the direction of exhaust gas flow has a bend where the direction of exhaust gas flow is bent at a right angle.
- the part of the exhaust passage 22 located upstream of the bend will be hereinafter referred to as the upstream exhaust passage 22 A
- the part of the exhaust passage 22 located downstream of the bend will be hereinafter referred to as the downstream exhaust passage 22 B.
- the SCR catalyst 23 includes a casing 24 accommodating therein a filter 25 (particulate filter) that serves as a DPF for capturing particulate matter (PM) in exhaust gas passing therethrough.
- the filter 25 supports thereon a catalytic component that accelerates selective catalytic reaction between NOx in exhaust gas and ammonia as a reducing agent, serving to remove NOx.
- the upstream exhaust passage 22 A and the downstream exhaust passage 22 B are of a cylindrical shape, and the upstream end of the downstream exhaust passage 22 B is closed by a planar end wall 22 C.
- the upstream exhaust passage 22 A is connected to the downstream exhaust passage 22 B at a position adjacent to the end wall 22 C so as to be perpendicular to the peripheral wall of the downstream exhaust passage 22 B.
- the downstream exhaust passage 22 B accommodates therein a cylindrical partition member 26 that is concentric with the downstream exhaust passage 22 B.
- the outer diameter of the partition member 26 is smaller than the inner diameter of the downstream exhaust passage 22 B.
- the partition member 26 is mounted at one end to the end wall 22 C of the downstream exhaust passage 22 B and opened at the other end to the interior of the downstream exhaust passage 22 B.
- the partition member 26 forms therein a mixing chamber 27 .
- the partition member 26 has plural circular openings 28 formed therein for allowing exhaust gas to flow into the mixing chamber 27 .
- the mixing chamber 27 is provided upstream of the SCR catalyst 23 in the downstream exhaust passage 22 B as viewed in the direction of exhaust gas flow.
- the downstream exhaust passage 22 B cooperates with the partition member 26 to form a space between the inner peripheral surface of the downstream exhaust passage 22 B and the outer peripheral surface of the partition member 26 . Exhaust gas introduced into the downstream exhaust passage 22 B flows through the space and further through the openings 28 of the partition member 26 into the mixing chamber 27 .
- a baffle plate 29 with plural holes 30 is provided downstream of the partition member 26 in the downstream exhaust passage 22 B.
- the baffle plate 29 is provided between the mixing chamber 27 and the SCR catalyst 23 .
- the baffle plate 29 serves to uniformly mix exhaust gas and combustion gas flowing therethrough.
- the exhaust gas treatment system 10 includes a fuel injection valve 31 , an air injection valve 32 and a urea water injection valve 33 which are mounted to the end wall 22 C of the downstream exhaust passage 22 B so as to be directed toward the mixing chamber 27 .
- the fuel injection valve 31 , the air injection valve 32 and the urea water injection valve 33 are arranged in parallel to one another so that the air injection valve 32 is located between the fuel injection valve 31 and the urea water injection valve 33 .
- the injection directions of the fuel injection valve 31 , the air injection valve 32 and the urea water injection valve 33 are substantially parallel to the direction of exhaust gas flow (horizontal direction in FIGS. 1 and 2 ) in the downstream exhaust passage 22 B.
- the injection ports 31 A, 32 A and 33 A of the respective injection valves 31 , 32 and 33 are aligned in vertical direction, as shown in FIG. 3 .
- the injection ports 31 A, 32 A and 33 A of the respective injection valves 31 , 32 and 33 are directed to the mixing chamber 27 , as shown in FIGS. 2 and 3 .
- the fuel injection valve 31 is connected through a fuel pipe 34 to a fuel tank 36 .
- the fuel pipe 34 is provided with a fuel pump 35 by which the amount of fuel to be injected is controlled. With the operation of the fuel pump 35 , fuel is supplied from the fuel tank 36 through the fuel pipe 34 to the fuel injection valve 31 and then injected in the form of a mist into the mixing chamber 27 .
- the fuel pump 35 is connected to the ECU 15 , and the fuel injection valve 31 is operated under the control of the ECU 15 .
- Fuel for injection from the fuel injection valve 31 is diesel fuel used for the engine 11 .
- the air injection valve 32 is connected through an air pipe 37 to an air pump 38 . With the operation of the air pump 38 , air is supplied from the air pump 38 to the air injection valve 32 and then injected into the mixing chamber 27 .
- the air pump 38 is connected to the ECU 15 , and the air injection valve 32 is operated under the control of the ECU 15 .
- the air injection valve 32 is operated simultaneously with the fuel injection valve 31 .
- the urea water injection valve 33 is connected through a urea water pipe 39 to a urea water tank 41 .
- the urea water pipe 39 is provided with a urea water pump 40 by which the amount of urea water to be injected is controlled.
- urea water is supplied from the urea water tank 41 through the urea water pipe 39 to the urea water injection valve 33 and then injected in the form of a mist into the mixing chamber 27 .
- the urea water pump 40 is connected to the ECU 15 , and the urea water injection valve 33 is operated under the control of the ECU 15 .
- the exhaust gas treatment system 10 further includes an igniter 42 for igniting fuel injected into the mixing chamber 27 .
- the igniter 42 is provided in the downstream region of the mixing chamber 27 .
- the igniter 42 is connected to and operated under the control of the ECU 15 . When fuel is ignited by the igniter 42 , flame is produced in the mixing chamber 27 . When the injection of fuel is continued, the flaming occurs continuously.
- the exhaust gas treatment system 10 mainly includes the exhaust passage 22 , the SCR catalyst 23 integrated with the filter 25 , the partition member 26 , the baffle plate 29 , the fuel injection valve 31 , the air injection valve 32 and the urea water injection valve 33 , and further includes the ECU 15 and the igniter 42 .
- Exhaust gas resulting from the combustion in the cylinders 12 of the engine 11 is delivered through the exhaust manifold 21 to the exhaust passage 22 and passes through the turbine 20 of the turbocharger 18 .
- the direction of exhaust gas flow is bent at a right angle toward the SCR catalyst 23 at the connection between the upstream and downstream exhaust passages 22 A and 22 B, and the exhaust gas flows through the SCR catalyst 23
- the fuel pump 35 , the air pump 38 , the urea water pump 40 and the igniter 42 are operated under the control of the ECU 15 so that fuel, air and urea water are injected simultaneously into the mixing chamber 27 from the respective injection valves 31 , 32 and 33 and the injected fuel is ignited by the igniter 42 .
- the injected fuel, air and urea water are mixed not only with one another but also with the exhaust gas flowing into the mixing chamber 27 through the openings 28 of the partition member 26 , so that the injected fuel, air and urea water are heated by the exhaust gas, which makes it easy for the igniter 42 to ignite the fuel so as to produce flame. Flaming in the mixing chamber 27 is continued when fuel injection is continued.
- the combustion gas resulting from the combustion of fuel in the mixing chamber 27 and containing urea water passes through the baffle plate 29 along with the exhaust gas having flowed through the space outside the mixing chamber 27 .
- the combustion gas and the exhaust gas are mixed uniformly by the baffle plate 29 , and then the mixture of gases passes through the SCR catalyst 23 .
- the SCR catalyst 23 receives heat from the mixture of gases to reach a temperature at which the SCR catalyst 23 , that is, the catalytic component supported on the filter 25 , becomes active, so that NOx and ammonia contained in the mixture are removed by selective catalytic reaction in the reaction region of the catalytic component.
- PM contained in the mixture is captured and collected by the filter 25 integrated with the SCR catalyst 23 .
- exhaust gas purification is achieved by the removal of NOx through the reducing reaction between ammonia and NOx and the capture of PM in the SCR catalyst 23 .
- urea water may be injected after the injection of fuel.
- the injected fuel and air are mixed with exhaust gas and heated by the exhaust gas, which makes it easier for the igniter 42 to ignite the fuel, so that flame is reliably produced by the combustion of fuel.
- the urea water is heated by the combustion gas flame and hydrolyzed by water vapor in the exhaust gas.
- the filer 25 integrated with the SCR catalyst 23 serves as a DPF. Since excessive accumulation of PM on the filter 25 may cause filter plugging, the filter 25 needs to be regenerated when a predetermined amount of PM is accumulated on the filter 25 .
- the amount of PM accumulation can be determined, for example, based on the difference of exhaust gas pressure between the upstream and downstream ends of the SCR catalyst 23 .
- fuel and air are injected into the mixing chamber 27 , and flame is produced in the mixing chamber 27 by the igniter 42 . Then high-temperature combustion gas resulting from the combustion in the mixing chamber 27 passes through the filter 25 in the SCR catalyst 23 , so that PM is burned off and the filter 25 is regenerated.
- urea water needs not to be injected immediately. This is because exhaust gas temperature just after a cold start of the engine is low and NOx is not produced in the exhaust gas. Since exhaust gas temperature is increased gradually after a cold start of the engine, urea water is injected, for example, when the exhaust gas reaches a temperature at which NOx starts to be produced. On the other hand, urea water may be injected since the time when the engine is started. In this case, the temperature of the SCR catalyst 23 is then low, and the ammonia produced by hydrolysis of urea water is adsorbed on the catalytic component of the SCR catalyst 23 .
- the exhaust gas treatment system 10 according to the first embodiment offers the following advantages.
- the mixing chamber 27 formed in the exhaust passage 22 is used not only for combustion of fuel but also for mixing of combustion gas and urea water, which allows shortening of the entire length of the exhaust passage 22 and also allows uniform mixing of combustion gas and urea water.
- the air injection valve 32 is located between the fuel injection valve 31 and the urea water injection valve 33 so that the urea water injection valve 33 is spaced apart from the fuel injection valve 31 and located adjacent to the air injection valve 32 . This allows cooling of the urea water injection valve 33 by injection of air, thereby preventing overheating of the urea water injection valve 33 .
- Exhaust gas is introduced into the mixing chamber 27 and mixed with the injected fuel and air, which allows the fuel and air to be heated by the exhaust gas and to combust easily.
- the SCR catalyst 23 integrated with the filter 25 allows further shortening of the entire length of the exhaust passage 22 .
- the heat resulting from the combustion in the mixing chamber 27 can be used for regeneration of the filter 25 .
- Simultaneous injection of fuel and urea water allows uniform mixing of fuel and urea water.
- the urea water receives the heat of the combustion gas simultaneously with the combustion of the fuel, hydrolysis of urea water is accelerated by the heat, and ammonia is produced easily.
- the fuel is combusted and then the urea water is mixed with the combustion gas, the fuel is adequately combusted, so that hydrolysis of urea water is further accelerated by the heat of the combustion gas.
- Flame is produced in the mixing chamber 27 by combustion of fuel, and the heat of the combustion gas can be used to regenerate the filter 25 .
- FIGS. 4 and 5 show the second embodiment of the present invention.
- same reference numerals are used for the common elements or components in the first and second embodiments, and the description of such elements or components for the second embodiment will be omitted.
- the exhaust gas treatment system 50 includes a multiple valve unit 51 having a fuel injection valve, an air injection valve and a urea water injection valve integrated as one unit.
- a fuel passage 52 is formed in the center of the multiple valve unit 51 , extending through the central axis of the multiple valve unit 51 .
- the fuel passage 52 is opened at one end to the mixing chamber 27 so as to form a fuel injection valve having an injection port 52 A directed to the mixing chamber 27 .
- the other end of the fuel passage 52 is connected through the fuel pipe 34 to the fuel pump 35 (see FIG. 1 ).
- an air passage 53 with annular cross section is located concentrically with and radially outward of the fuel passage 52 .
- the air passage 53 is opened at one end to the mixing chamber 27 so as to form an air injection valve having an injection port 53 A directed to the mixing chamber 27 .
- the other end of the air passage 53 is connected through the air pipe 37 to the air pump 38 (see FIG. 1 ).
- a urea water passage 54 with annular cross section is concentric with the fuel passage 52 and located radially outward of the air passage 53 .
- the urea water passage 54 is opened at one end to the mixing chamber 27 so as to form a urea water injection valve having an injection port 54 A directed to the mixing chamber 27 .
- the other end of the urea water passage 54 is connected to the urea water tank 41 through the urea water pipe 39 provided with the urea water pump 40 (see FIG. 1 ).
- the multiple valve unit 51 is provided in the end wall 22 C of the downstream exhaust passage 22 B so that fuel, air and urea water are injected into the mixing chamber 27 .
- the injection directions of fuel, air and urea water are substantially parallel to the direction of exhaust gas flow in the downstream exhaust passage 22 B.
- the number of parts of the system can be reduced, and such injection valves can be provided at a time so as to be directed toward the mixing chamber 27 .
- the air passage 53 is located between the fuel passage 52 and the urea water passage 54 so that the urea water passage 54 is spaced apart from and located radially outward of and the fuel passage 52 .
- the injected air prevents the urea water passage 54 from receiving heat directly from the fuel passage 52 , thereby preventing overheating of the urea water passage 54 .
- An oxidation catalyst may be provided downstream of the SCR catalyst 23 in the exhaust passage 22 so as to remove the excessive ammonia produced from urea water and the ammonia released from the SCR catalyst 23 .
- the filter 25 in the SCR catalyst 23 serves not only as a particulate filter for capturing PM but also as a selective catalytic reduction catalyst, the particulate filter may be provided separately from the selective catalytic reduction catalyst.
- the mixing chamber 27 is formed by the cylindrical partition member 26 with the circular openings 28
- the partition member may be of any shape or structure so as to form the mixing chamber in which fuel, air, urea water, and exhaust gas can be mixed.
- the openings 28 of the partition member 26 for introducing exhaust gas into the mixing chamber 27 may be replaced with slits or mesh structure.
- the partition member 26 is provided separately from the baffle plate 29 , the partition member and the baffle plate may be integrated.
- the baffle plate 29 may be omitted when exhaust gas can be mixed uniformly with combustion gas in a region downstream of the mixing chamber 27 without using the baffle plate 29 .
- the baffle plate 29 may be of any shape or structure so as to mix the gases uniformly.
- the simultaneous injection of fuel, air and urea water, the simultaneous injection of fuel and air, and the injection of urea water after the simultaneous injection of fuel and air are described.
- only the urea water may be injected depending on the engine operating conditions.
- the injection valves 31 , 32 , 33 are arranged in parallel to one another so that the injection ports 31 A, 32 A, 33 A of the respective injection valves 31 , 32 , 33 are aligned in vertical direction.
- the injection ports 31 A, 32 A, 33 A may be aligned in any direction, or the injection valves 31 , 32 , 33 may be arranged in any order.
- the fuel passage 52 , the air passage 53 and the urea water passage 54 are concentric with one another in the multiple valve unit 51 .
- the multiple valve unit 51 may have such a structure that the fuel passage, the air passage and the urea water passage are at the same distance from the central axis of the multiple valve unit 51 and the passages are angularly spaced at regular intervals.
- the multiple valve unit 51 may have such a structure that the fuel injection valve 31 , the air injection valve 32 and the urea water injection valve 33 in the first embodiment are simply integrated.
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Abstract
An exhaust gas treatment system includes an exhaust passage through which exhaust gas from an internal combustion engine is allowed to flow, a selective catalytic reduction catalyst provided in the exhaust passage, a mixing chamber provided upstream of the selective catalytic reduction catalyst in the exhaust passage as viewed in the direction of exhaust gas flow, a fuel injection valve for injection of fuel, an air injection valve for injection of air, and a urea water injection valve for injection of urea water. The fuel injection valve, the air injection valve and the urea water injection valve each has an injection port directed to the mixing chamber.
Description
- The present invention relates to an exhaust gas treatment system, and more particularly to an exhaust gas treatment system including an injection valve for injecting urea water into exhaust gas and a selective catalytic reduction catalyst.
- A conventional exhaust gas treatment system is disclosed in Japanese Unexamined Patent Application Publication No. 2009-68424. The system includes an exhaust passage through which engine exhaust gas flows, a diesel particulate filter (DPF) provided in the exhaust passage, a urea SCR catalyst located downstream of the DPF in the exhaust passage as viewed in the direction of exhaust gas flow, and an ammonia oxidation catalyst located downstream of the urea SCR catalyst. The system further includes an injection nozzle for supplying urea water into the exhaust passage and a burner for accelerating activation of the SCR catalyst. The injection nozzle is provided between the DPF and the urea SCR catalyst, and the burner is provided upstream of the DPF in the exhaust passage. In the system, use of combustion heat produced by the burner shortens the time it takes to activate the SCR catalyst after a cold start of the engine, resulting in shortening of the time it takes to start NOx reduction.
- In the system, however, since the burner is located apart from the injection nozzle, the combustion space of the burner needs to be provided in the exhaust passage separately from the mixing space for mixing urea water and exhaust gas. In this case, the combustion space needs to be provided with a structure or means for accelerating uniform mixing of fuel and exhaust gas, and the mixing space needs to be provided with a structure such as a mixer for uniform mixing of urea water and exhaust gas. Thus, the combustion space and the mixing space provided separately in the exhaust passage results in increased entire length of the exhaust passage. This leads not only to increased size of the system but also to increased heat loss by radiation in the exhaust passage.
- The present invention is directed to providing an exhaust gas treatment system that allows shortening of the entire length of an exhaust passage and also allows uniform mixing of urea water and combustion gas resulting from the combustion of fuel.
- In accordance with an aspect of the present invention, an exhaust gas treatment system includes an exhaust passage through which exhaust gas from an internal combustion engine is allowed to flow, a selective catalytic reduction catalyst provided in the exhaust passage, a mixing chamber provided upstream of the selective catalytic reduction catalyst in the exhaust passage as viewed in the direction of exhaust gas flow, a fuel injection valve for injection of fuel, an air injection valve for injection of air, and a urea water injection valve for injection of urea water. The fuel injection valve, the air injection valve and the urea water injection valve each has an injection port directed to the mixing chamber.
- Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
-
FIG. 1 is a schematic view of an engine equipped with an exhaust gas treatment system according to a first embodiment of the present invention; -
FIG. 2 is an enlarged fragmentary sectional view of the exhaust gas treatment system ofFIG. 1 ; -
FIG. 3 is a cross-sectional view taken along the line III-III ofFIG. 2 ; -
FIG. 4 is a fragmentary sectional view of an exhaust gas treatment system according to a second embodiment of the present invention; and -
FIG. 5 is a cross-sectional view taken along the line V-V ofFIG. 4 . - The following will describe the embodiments of the exhaust gas treatment system according to the present invention with reference to the accompanying drawings. In the embodiments, the exhaust gas treatment system is intended to be installed in a vehicle with a diesel engine as an internal combustion engine.
- Referring to
FIG. 1 , theengine 11, which is equipped with an exhaustgas treatment system 10, hasplural cylinders 12 into which fuel is injected fromrespective fuel injectors 13 that are connected to acommon rail 14 where fuel is stored at a high pressure. Theengine 11 is operated under the control of an engine control unit (ECU) 15. Although not shown in the drawings, theECU 15 includes microprocessors for calculation, ROMs and RAMs for storing data and programs, and interfaces for connection to other devices. - An
intake passage 17 is connected to anintake manifold 16 of theengine 11, and anexhaust passage 22 is connected to anexhaust manifold 21 of theengine 11. Theengine 11 is equipped with aturbocharger 18 that uses exhaust gas to increase intake pressure. Theturbocharger 18 has acompressor 19 provided in theintake passage 17 and aturbine 20 provided in theexhaust passage 22. - Part of the
exhaust passage 22 located downstream of theturbine 20 of theturbocharger 18 as viewed in the direction of exhaust gas flow has a bend where the direction of exhaust gas flow is bent at a right angle. In the following description, the part of theexhaust passage 22 located upstream of the bend will be hereinafter referred to as theupstream exhaust passage 22A, and the part of theexhaust passage 22 located downstream of the bend will be hereinafter referred to as thedownstream exhaust passage 22B. There is provided in thedownstream exhaust passage 22B a selective catalytic reduction (SCR)catalyst 23. TheSCR catalyst 23 includes acasing 24 accommodating therein a filter 25 (particulate filter) that serves as a DPF for capturing particulate matter (PM) in exhaust gas passing therethrough. Thefilter 25 supports thereon a catalytic component that accelerates selective catalytic reaction between NOx in exhaust gas and ammonia as a reducing agent, serving to remove NOx. - Referring to
FIG. 2 , theupstream exhaust passage 22A and thedownstream exhaust passage 22B are of a cylindrical shape, and the upstream end of thedownstream exhaust passage 22B is closed by aplanar end wall 22C. Theupstream exhaust passage 22A is connected to thedownstream exhaust passage 22B at a position adjacent to theend wall 22C so as to be perpendicular to the peripheral wall of thedownstream exhaust passage 22B. Thedownstream exhaust passage 22B accommodates therein acylindrical partition member 26 that is concentric with thedownstream exhaust passage 22B. The outer diameter of thepartition member 26 is smaller than the inner diameter of thedownstream exhaust passage 22B. Thepartition member 26 is mounted at one end to theend wall 22C of thedownstream exhaust passage 22B and opened at the other end to the interior of thedownstream exhaust passage 22B. That is, the upstream end of thepartition member 26 is closed by theend wall 22C, and the downstream end of thepartition member 26 is opened. Thepartition member 26 forms therein amixing chamber 27. Thepartition member 26 has pluralcircular openings 28 formed therein for allowing exhaust gas to flow into themixing chamber 27. Themixing chamber 27 is provided upstream of theSCR catalyst 23 in thedownstream exhaust passage 22B as viewed in the direction of exhaust gas flow. Thedownstream exhaust passage 22B cooperates with thepartition member 26 to form a space between the inner peripheral surface of thedownstream exhaust passage 22B and the outer peripheral surface of thepartition member 26. Exhaust gas introduced into thedownstream exhaust passage 22B flows through the space and further through theopenings 28 of thepartition member 26 into themixing chamber 27. Abaffle plate 29 withplural holes 30 is provided downstream of thepartition member 26 in thedownstream exhaust passage 22B. Thebaffle plate 29 is provided between themixing chamber 27 and theSCR catalyst 23. Thebaffle plate 29 serves to uniformly mix exhaust gas and combustion gas flowing therethrough. - The exhaust
gas treatment system 10 includes afuel injection valve 31, anair injection valve 32 and a ureawater injection valve 33 which are mounted to theend wall 22C of thedownstream exhaust passage 22B so as to be directed toward themixing chamber 27. Thefuel injection valve 31, theair injection valve 32 and the ureawater injection valve 33 are arranged in parallel to one another so that theair injection valve 32 is located between thefuel injection valve 31 and the ureawater injection valve 33. The injection directions of thefuel injection valve 31, theair injection valve 32 and the ureawater injection valve 33 are substantially parallel to the direction of exhaust gas flow (horizontal direction inFIGS. 1 and 2 ) in thedownstream exhaust passage 22B. Theinjection ports respective injection valves FIG. 3 . Theinjection ports respective injection valves mixing chamber 27, as shown inFIGS. 2 and 3 . - As shown in
FIG. 1 , thefuel injection valve 31 is connected through afuel pipe 34 to afuel tank 36. Thefuel pipe 34 is provided with afuel pump 35 by which the amount of fuel to be injected is controlled. With the operation of thefuel pump 35, fuel is supplied from thefuel tank 36 through thefuel pipe 34 to thefuel injection valve 31 and then injected in the form of a mist into themixing chamber 27. Thefuel pump 35 is connected to theECU 15, and thefuel injection valve 31 is operated under the control of theECU 15. Fuel for injection from thefuel injection valve 31 is diesel fuel used for theengine 11. - The
air injection valve 32 is connected through anair pipe 37 to anair pump 38. With the operation of theair pump 38, air is supplied from theair pump 38 to theair injection valve 32 and then injected into themixing chamber 27. Theair pump 38 is connected to theECU 15, and theair injection valve 32 is operated under the control of theECU 15. Theair injection valve 32 is operated simultaneously with thefuel injection valve 31. - The urea
water injection valve 33 is connected through aurea water pipe 39 to aurea water tank 41. Theurea water pipe 39 is provided with aurea water pump 40 by which the amount of urea water to be injected is controlled. With the operation of theurea water pump 40, urea water is supplied from theurea water tank 41 through theurea water pipe 39 to the ureawater injection valve 33 and then injected in the form of a mist into the mixingchamber 27. Theurea water pump 40 is connected to theECU 15, and the ureawater injection valve 33 is operated under the control of theECU 15. - The exhaust
gas treatment system 10 further includes anigniter 42 for igniting fuel injected into the mixingchamber 27. Theigniter 42 is provided in the downstream region of the mixingchamber 27. Theigniter 42 is connected to and operated under the control of theECU 15. When fuel is ignited by theigniter 42, flame is produced in the mixingchamber 27. When the injection of fuel is continued, the flaming occurs continuously. - The exhaust
gas treatment system 10 mainly includes theexhaust passage 22, theSCR catalyst 23 integrated with thefilter 25, thepartition member 26, thebaffle plate 29, thefuel injection valve 31, theair injection valve 32 and the ureawater injection valve 33, and further includes theECU 15 and theigniter 42. - The following will describe the operation of the exhaust
gas treatment system 10. - Exhaust gas resulting from the combustion in the
cylinders 12 of theengine 11 is delivered through theexhaust manifold 21 to theexhaust passage 22 and passes through theturbine 20 of theturbocharger 18. The direction of exhaust gas flow is bent at a right angle toward theSCR catalyst 23 at the connection between the upstream anddownstream exhaust passages SCR catalyst 23 - When flame is produced in the mixing
chamber 27, thefuel pump 35, theair pump 38, theurea water pump 40 and theigniter 42 are operated under the control of theECU 15 so that fuel, air and urea water are injected simultaneously into the mixingchamber 27 from therespective injection valves igniter 42. In the mixingchamber 27, the injected fuel, air and urea water are mixed not only with one another but also with the exhaust gas flowing into the mixingchamber 27 through theopenings 28 of thepartition member 26, so that the injected fuel, air and urea water are heated by the exhaust gas, which makes it easy for theigniter 42 to ignite the fuel so as to produce flame. Flaming in the mixingchamber 27 is continued when fuel injection is continued. - When fuel and urea water are injected simultaneously under the control of the
ECU 15, hydrolysis of urea water proceeds just after the fuel ignition by the heat of the combustion gas flame and water vapor in exhaust gas, so that ammonia is produced. When the combustion of fuel is continued, the injection of air by theair injection valve 32 is also continued. In the present embodiment wherein the ureawater injection valve 33 is located apart from thefuel injection valve 31 and adjacent to theair injection valve 32, the injected air prevents the ureawater injection valve 33 from receiving heat directly from the flame produced in a region downstream of thefuel injection valve 31. Thus, even when the injection of fuel is continued in the mixingchamber 27, overheating of the ureawater injection valve 33 is prevented. - In a region downstream of the mixing
chamber 27, the combustion gas resulting from the combustion of fuel in the mixingchamber 27 and containing urea water passes through thebaffle plate 29 along with the exhaust gas having flowed through the space outside the mixingchamber 27. The combustion gas and the exhaust gas are mixed uniformly by thebaffle plate 29, and then the mixture of gases passes through theSCR catalyst 23. - The
SCR catalyst 23 receives heat from the mixture of gases to reach a temperature at which theSCR catalyst 23, that is, the catalytic component supported on thefilter 25, becomes active, so that NOx and ammonia contained in the mixture are removed by selective catalytic reaction in the reaction region of the catalytic component. In addition, PM contained in the mixture is captured and collected by thefilter 25 integrated with theSCR catalyst 23. Thus, exhaust gas purification is achieved by the removal of NOx through the reducing reaction between ammonia and NOx and the capture of PM in theSCR catalyst 23. - Although in the present embodiment fuel and urea water are injected simultaneously into the mixing
chamber 27, urea water may be injected after the injection of fuel. In this case, the injected fuel and air are mixed with exhaust gas and heated by the exhaust gas, which makes it easier for theigniter 42 to ignite the fuel, so that flame is reliably produced by the combustion of fuel. When urea water is injected after the injected fuel is adequately combusted, the urea water is heated by the combustion gas flame and hydrolyzed by water vapor in the exhaust gas. Even when urea water is injected after an elapse of time subsequent to the production of flame, the reducing reaction between NOx and ammonia adsorbed on the catalytic component occurs in theSCR catalyst 23 that has been activated by high temperature gases, which prevents NOx from passing through theSCR catalyst 23 without being removed. - In the present embodiment, the
filer 25 integrated with theSCR catalyst 23 serves as a DPF. Since excessive accumulation of PM on thefilter 25 may cause filter plugging, thefilter 25 needs to be regenerated when a predetermined amount of PM is accumulated on thefilter 25. The amount of PM accumulation can be determined, for example, based on the difference of exhaust gas pressure between the upstream and downstream ends of theSCR catalyst 23. When it is determined by theECU 15 that thefilter 15 needs to be regenerated, fuel and air are injected into the mixingchamber 27, and flame is produced in the mixingchamber 27 by theigniter 42. Then high-temperature combustion gas resulting from the combustion in the mixingchamber 27 passes through thefilter 25 in theSCR catalyst 23, so that PM is burned off and thefilter 25 is regenerated. - During a cold start of the engine, fuel and air are injected into the mixing
chamber 27 so as to produce flame, but urea water needs not to be injected immediately. This is because exhaust gas temperature just after a cold start of the engine is low and NOx is not produced in the exhaust gas. Since exhaust gas temperature is increased gradually after a cold start of the engine, urea water is injected, for example, when the exhaust gas reaches a temperature at which NOx starts to be produced. On the other hand, urea water may be injected since the time when the engine is started. In this case, the temperature of theSCR catalyst 23 is then low, and the ammonia produced by hydrolysis of urea water is adsorbed on the catalytic component of theSCR catalyst 23. - The exhaust
gas treatment system 10 according to the first embodiment offers the following advantages. - (1) Since fuel, air and urea water are injected into the mixing
chamber 27, the injected fuel is combusted in the mixingchamber 27 to produce flame, and the combustion gas is mixed with the injected urea water. The heat of the combustion gas accelerates the hydrolysis of urea water into ammonia in theexhaust passage 22. The mixingchamber 27 formed in theexhaust passage 22 is used not only for combustion of fuel but also for mixing of combustion gas and urea water, which allows shortening of the entire length of theexhaust passage 22 and also allows uniform mixing of combustion gas and urea water. - (2) The
air injection valve 32 is located between thefuel injection valve 31 and the ureawater injection valve 33 so that the ureawater injection valve 33 is spaced apart from thefuel injection valve 31 and located adjacent to theair injection valve 32. This allows cooling of the ureawater injection valve 33 by injection of air, thereby preventing overheating of the ureawater injection valve 33. - (3) Exhaust gas is introduced into the mixing
chamber 27 and mixed with the injected fuel and air, which allows the fuel and air to be heated by the exhaust gas and to combust easily. - (4) The
SCR catalyst 23 integrated with the filter 25 (DPF) allows further shortening of the entire length of theexhaust passage 22. In addition, the heat resulting from the combustion in the mixingchamber 27 can be used for regeneration of thefilter 25. - (5) Simultaneous injection of fuel and urea water allows uniform mixing of fuel and urea water. In this case, since the urea water receives the heat of the combustion gas simultaneously with the combustion of the fuel, hydrolysis of urea water is accelerated by the heat, and ammonia is produced easily. On the other hand, when the fuel is combusted and then the urea water is mixed with the combustion gas, the fuel is adequately combusted, so that hydrolysis of urea water is further accelerated by the heat of the combustion gas.
- (6) Flame is produced in the mixing
chamber 27 by combustion of fuel, and the heat of the combustion gas can be used to regenerate thefilter 25. -
FIGS. 4 and 5 show the second embodiment of the present invention. In the drawings, same reference numerals are used for the common elements or components in the first and second embodiments, and the description of such elements or components for the second embodiment will be omitted. - As shown in
FIG. 4 , the exhaustgas treatment system 50 includes amultiple valve unit 51 having a fuel injection valve, an air injection valve and a urea water injection valve integrated as one unit. Afuel passage 52 is formed in the center of themultiple valve unit 51, extending through the central axis of themultiple valve unit 51. Thefuel passage 52 is opened at one end to the mixingchamber 27 so as to form a fuel injection valve having aninjection port 52A directed to the mixingchamber 27. The other end of thefuel passage 52 is connected through thefuel pipe 34 to the fuel pump 35 (seeFIG. 1 ). - As shown in
FIG. 5 , anair passage 53 with annular cross section is located concentrically with and radially outward of thefuel passage 52. Theair passage 53 is opened at one end to the mixingchamber 27 so as to form an air injection valve having aninjection port 53A directed to the mixingchamber 27. The other end of theair passage 53 is connected through theair pipe 37 to the air pump 38 (seeFIG. 1 ). - A
urea water passage 54 with annular cross section is concentric with thefuel passage 52 and located radially outward of theair passage 53. Theurea water passage 54 is opened at one end to the mixingchamber 27 so as to form a urea water injection valve having aninjection port 54A directed to the mixingchamber 27. The other end of theurea water passage 54 is connected to theurea water tank 41 through theurea water pipe 39 provided with the urea water pump 40 (seeFIG. 1 ). - The
multiple valve unit 51 is provided in theend wall 22C of thedownstream exhaust passage 22B so that fuel, air and urea water are injected into the mixingchamber 27. The injection directions of fuel, air and urea water are substantially parallel to the direction of exhaust gas flow in thedownstream exhaust passage 22B. - According to the second embodiment wherein the fuel injection valve, the air injection valve and the urea water injection valve are integrated in the
multiple valve unit 51, the number of parts of the system can be reduced, and such injection valves can be provided at a time so as to be directed toward the mixingchamber 27. Further, theair passage 53 is located between thefuel passage 52 and theurea water passage 54 so that theurea water passage 54 is spaced apart from and located radially outward of and thefuel passage 52. In this case, the injected air prevents theurea water passage 54 from receiving heat directly from thefuel passage 52, thereby preventing overheating of theurea water passage 54. - The above embodiments may be modified in various ways as exemplified below.
- An oxidation catalyst may be provided downstream of the
SCR catalyst 23 in theexhaust passage 22 so as to remove the excessive ammonia produced from urea water and the ammonia released from theSCR catalyst 23. - Although in the first and second embodiments the
filter 25 in theSCR catalyst 23 serves not only as a particulate filter for capturing PM but also as a selective catalytic reduction catalyst, the particulate filter may be provided separately from the selective catalytic reduction catalyst. - Although in the first and second embodiments the mixing
chamber 27 is formed by thecylindrical partition member 26 with thecircular openings 28, the partition member may be of any shape or structure so as to form the mixing chamber in which fuel, air, urea water, and exhaust gas can be mixed. In addition, theopenings 28 of thepartition member 26 for introducing exhaust gas into the mixingchamber 27 may be replaced with slits or mesh structure. - Although in the first and second embodiments the
partition member 26 is provided separately from thebaffle plate 29, the partition member and the baffle plate may be integrated. - The
baffle plate 29 may be omitted when exhaust gas can be mixed uniformly with combustion gas in a region downstream of the mixingchamber 27 without using thebaffle plate 29. - The
baffle plate 29 may be of any shape or structure so as to mix the gases uniformly. - In the first and second embodiments, the simultaneous injection of fuel, air and urea water, the simultaneous injection of fuel and air, and the injection of urea water after the simultaneous injection of fuel and air are described. Alternatively, only the urea water may be injected depending on the engine operating conditions.
- In the first embodiment, the
injection valves injection ports respective injection valves injection ports injection valves - In the second embodiment, the
fuel passage 52, theair passage 53 and theurea water passage 54 are concentric with one another in themultiple valve unit 51. Alternatively, themultiple valve unit 51 may have such a structure that the fuel passage, the air passage and the urea water passage are at the same distance from the central axis of themultiple valve unit 51 and the passages are angularly spaced at regular intervals. In addition, themultiple valve unit 51 may have such a structure that thefuel injection valve 31, theair injection valve 32 and the ureawater injection valve 33 in the first embodiment are simply integrated.
Claims (13)
1. An exhaust gas treatment system, comprising:
an exhaust passage through which exhaust gas from an internal combustion engine is allowed to flow;
a selective catalytic reduction catalyst provided in the exhaust passage,
a mixing chamber provided upstream of the selective catalytic reduction catalyst in the exhaust passage as viewed in the direction of exhaust gas flow;
a fuel injection valve for injection of fuel;
an air injection valve for injection of air; and
a urea water injection valve for injection of urea water,
wherein the fuel injection valve, the air injection valve and the urea water injection valve each has an injection port directed to the mixing chamber.
2. The exhaust gas treatment system according to claim 1 , wherein the fuel injection valve, the air injection valve and the urea water injection valve are arranged parallel to one another, and the air injection valve is located between the fuel injection valve and the urea water injection valve.
3. The exhaust gas treatment system according to claim 1 , wherein the fuel injection valve, the air injection valve and the urea water injection valve are integrated in one unit.
4. The exhaust gas treatment system according to claim 1 , wherein the injection directions of the fuel injection valve, the air injection valve and the urea water injection valve are substantially parallel to the direction of exhaust gas flow in the exhaust passage.
5. The exhaust gas treatment system according to claim 1 , further comprising a partition member provided in the exhaust passage, the partition member forming therein the mixing chamber and having openings for introducing exhaust gas from the outside to the inside of the mixing chamber.
6. The exhaust gas treatment system according to claim 5 , wherein the partition member is of a cylindrical shape and concentric with the exhaust passage.
7. The exhaust gas treatment system according to claim 5 , wherein the partition member is of a cylindrical shape, the upstream end of the partition member being closed by an end wall where the fuel injection valve, the air injection valve and the urea water injection valve are mounted, the downstream end of the partition member being opened.
8. The exhaust gas treatment system according to claim 1 , wherein the selective catalytic reduction catalyst is integrated with a particulate filter for capturing particulate matter.
9. The exhaust gas treatment system according to claim 8 , further comprising a controller by which the fuel injection valve is operated so that fuel is injected when the particulate filter needs to be regenerated.
10. The exhaust gas treatment system according to claim 1 , further comprising a controller by which the fuel injection valve and the urea water injection valve are operated so that fuel and urea water are injected simultaneously.
11. The exhaust gas treatment system according to claim 1 , further comprising a controller by which the fuel injection valve and the urea water injection valve are operated so that urea water is injected after injection of fuel.
12. The exhaust gas treatment system according to claim 1 , further comprising a baffle plate provided between the mixing chamber and the selective catalytic reduction catalyst for mixing of gases flowing therethrough.
13. The exhaust gas treatment system according to claim 1 , wherein at least two of the injection ports has annular cross section, and the injection ports are all concentric with each other.
Applications Claiming Priority (2)
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JPP2009-212667 | 2009-09-15 | ||
JP2009212667A JP2011064069A (en) | 2009-09-15 | 2009-09-15 | Exhaust gas treatment system |
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Publication Number | Publication Date |
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US20110061374A1 true US20110061374A1 (en) | 2011-03-17 |
Family
ID=43384184
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US12/879,280 Abandoned US20110061374A1 (en) | 2009-09-15 | 2010-09-10 | Exhaust gas treatment system |
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US (1) | US20110061374A1 (en) |
EP (1) | EP2295755A2 (en) |
JP (1) | JP2011064069A (en) |
KR (1) | KR20110030340A (en) |
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2009
- 2009-09-15 JP JP2009212667A patent/JP2011064069A/en active Pending
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2010
- 2010-08-31 EP EP10174596A patent/EP2295755A2/en not_active Withdrawn
- 2010-09-10 US US12/879,280 patent/US20110061374A1/en not_active Abandoned
- 2010-09-13 KR KR1020100089404A patent/KR20110030340A/en not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
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JP2011064069A (en) | 2011-03-31 |
KR20110030340A (en) | 2011-03-23 |
EP2295755A2 (en) | 2011-03-16 |
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