WO2011090190A1 - ディーゼルエンジンの排気浄化装置及び排気浄化方法 - Google Patents

ディーゼルエンジンの排気浄化装置及び排気浄化方法 Download PDF

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Publication number
WO2011090190A1
WO2011090190A1 PCT/JP2011/051204 JP2011051204W WO2011090190A1 WO 2011090190 A1 WO2011090190 A1 WO 2011090190A1 JP 2011051204 W JP2011051204 W JP 2011051204W WO 2011090190 A1 WO2011090190 A1 WO 2011090190A1
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Prior art keywords
exhaust
diesel engine
oxidation catalyst
exhaust gas
turbine
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Ceased
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PCT/JP2011/051204
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English (en)
French (fr)
Japanese (ja)
Inventor
和生 大角
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Isuzu Motors Ltd
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Isuzu Motors Ltd
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Publication date
Application filed by Isuzu Motors Ltd filed Critical Isuzu Motors Ltd
Priority to US13/574,431 priority Critical patent/US20120315204A1/en
Priority to EP11734796.3A priority patent/EP2530265B1/en
Priority to CN201180007039.0A priority patent/CN102725486B/zh
Publication of WO2011090190A1 publication Critical patent/WO2011090190A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • 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
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
    • 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
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
    • F01N13/0093—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series the purifying devices are of the same type
    • 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
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—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
    • 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
    • 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
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0864—Oxygen
    • 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
    • F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
    • F01N3/106—Auxiliary oxidation catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/004—Engines characterised by provision of pumps driven at least for part of the time by exhaust with exhaust drives arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/02—Gas passages between engine outlet and pump drive, e.g. reservoirs
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/10—Noble metals or compounds thereof
    • B01D2255/102—Platinum group metals
    • B01D2255/1021—Platinum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/206—Rare earth metals
    • B01D2255/2061—Yttrium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20707—Titanium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/20—Metals or compounds thereof
    • B01D2255/207—Transition metals
    • B01D2255/20792—Zinc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/908—O2-storage component incorporated in the catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2255/00—Catalysts
    • B01D2255/90—Physical characteristics of catalysts
    • B01D2255/912—HC-storage component incorporated in the catalyst
    • 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
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the exhaust apparatus; Spatial arrangements of exhaust apparatuses
    • F01N2340/02—Distance of the exhaust apparatus to the engine or between two exhaust apparatuses
    • 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
    • F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the exhaust apparatus; Spatial arrangements of exhaust apparatuses
    • F01N2340/06—Arrangement of the exhaust apparatus relative to the turbine of a turbocharger
    • 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
    • F01N2370/00—Selection of materials for exhaust purification
    • F01N2370/02—Selection of materials for exhaust purification used in catalytic reactors
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • 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 an exhaust gas purification device and an exhaust gas purification method for a diesel engine.
  • the temperature of the exhaust gas flowing out from the exhaust port of the engine is lowered by 30 to 50 ° C. or more compared to the conventional (before improvement).
  • the exhaust gas purification apparatus constituted by these aftertreatment units becomes large and its heat capacity increases. It is difficult for the exhaust gas purification apparatus having an increased heat capacity to secure the catalyst activation temperature depending on the operating condition of the engine.
  • the exhaust purification device that has been enlarged will be disposed far from the exhaust port of the engine due to the problem of installation space, and it becomes increasingly difficult to ensure the catalyst activation temperature. As a result, the reduction effect of harmful substances in each aftertreatment unit of the exhaust gas purification device is reduced.
  • An object of the present invention which was created in view of the above circumstances, is to exhaust a diesel engine that can effectively use the heat of exhaust gas and can be miniaturized by devising the arrangement of each aftertreatment unit. It is an object of the present invention to provide a purification device and an exhaust purification method using the same.
  • an exhaust emission control device for a diesel engine is disposed in an exhaust passage of a diesel engine, and an oxidation catalyst for purifying CO and HC in exhaust gas, and the downstream of the oxidation catalyst.
  • a urea injection nozzle that is disposed in the exhaust passage and generates ammonia by spraying urea water in the exhaust gas, and is disposed in the exhaust passage downstream of the urea injection nozzle and agitates the sprayed urea water
  • a turbocharger turbine that promotes the decomposition of urea, a selective reduction catalyst that is disposed in the exhaust passage downstream of the turbine and detoxifies by reducing NOx in the exhaust gas with ammonia; and Diesel particulate filter that is disposed in the exhaust passage downstream of the selective reduction catalyst and collects particulate matter in the exhaust gas It is those with a.
  • the diesel particulate filter may be coated with an oxidation catalyst for oxidizing the collected particulate matter.
  • a post-stage oxidation catalyst for oxidizing and detoxifying ammonia flowing out of the diesel particulate filter may be further disposed in the exhaust passage downstream of the diesel particulate filter.
  • the oxidation catalyst has a manifold oxidation catalyst disposed in each cylinder portion of the exhaust manifold of the diesel engine, and a pre-turbine oxidation catalyst disposed in a collective portion of the exhaust manifold, and the manifold oxidation catalyst includes the
  • the pre-turbine oxidation catalyst may be more excellent in CO purification, and the pre-turbine oxidation catalyst may be better in HC purification than the manifold oxidation catalyst.
  • the manifold oxidation catalyst may be a catalyst including an oxide having an oxygen storage material and an oxide semiconductor, and the pre-turbine oxidation catalyst may be a metal catalyst.
  • the oxide having the oxygen storage material may be an oxide containing Ce, and the oxide semiconductor may be TiO 2 , ZnO, or Y 2 O 3 .
  • a noble metal may be supported on the oxide having the oxygen storage material.
  • ammonia (NH 3 ) generated from urea water sprayed from the urea injection nozzle reacts with sulfur oxide (SOx) in the exhaust gas.
  • SOx sulfur oxide
  • 2NH 3 + SO 4 ⁇ (NH 4 ) 2SO 4 is generated, and this (NH 4 ) 2SO 4 is trapped by the selective catalytic reduction catalyst to produce ammonia (NH 3 ) by thermal decomposition, and this ammonia (NH 3 ) Is used in the reduction reaction of NOx.
  • the heat of exhaust gas can be used effectively and the device can be miniaturized by devising the arrangement of each aftertreatment unit. .
  • FIG. 1 is an explanatory view showing a relationship between the SCR and DOC temperatures and the purification rate, as well as showing an exhaust emission control device for a diesel engine according to a comparative example (not an embodiment of the present invention).
  • FIG. 2 is an explanatory diagram showing a relationship between the temperature of the SCR and the DOC and the purification rate while showing the exhaust gas purification apparatus for a diesel engine according to one embodiment of the present invention.
  • an intake pipe 3 is connected to the intake manifold 2 of the diesel engine 1 and an exhaust pipe 5 is connected to the exhaust manifold 4.
  • the intake manifold 2 and the intake pipe 3 constitute an intake passage 6, and the exhaust manifold 4 and the exhaust pipe 5 constitute an exhaust passage 7.
  • a high-pressure stage turbocharger (high-pressure stage turbo) 8 and a low-pressure stage turbocharger (low-pressure stage turbo) 9 are connected in series to the intake pipe 3 and the exhaust pipe 5.
  • the exhaust pipe 5 is provided with a high-pressure turbine 12 of the high-pressure stage turbo 8 and a low-pressure stage turbine 13 of the low-pressure stage turbo 9, and the high-pressure stage compressor 10 of the high-pressure stage turbo 8 is connected to the low-pressure stage turbine 9.
  • a low-pressure stage compressor 11 of the stage turbo 9 is provided.
  • An intercooler 14 is disposed in the intake pipe 3 downstream of the high-pressure compressor 10.
  • the exhaust manifold 4 and the intake pipe 3 are connected by an EGR pipe 15, and an EGR valve 16 is disposed in the EGR pipe 15.
  • an EGR cooler (not shown) may be provided in the EGR pipe 15.
  • the exhaust pipe 5 downstream of the low-pressure turbine 13 is provided with an exhaust purification device 17a that purifies harmful substances (PM, NOx, CO, HC, etc.) in the exhaust gas.
  • the exhaust purification device 17a will be described later.
  • a part of the exhaust gas directed to the muffler (not shown) is supplied to the intake pipe 3 (upstream of the low pressure compressor 11, between the low pressure compressor 11 and the high pressure compressor 10, between the high pressure stage and the exhaust pipe 5).
  • a low pressure EGR pipe 18 that leads to any one upstream of the compressor 10 is connected.
  • the low pressure EGR pipe 18 is provided with a low pressure EGR valve (not shown), and an EGR cooler may be provided.
  • the exhaust purification device 17a includes a first casing 21a in which an oxidation catalyst (DOC) 19a is housed, a urea injection nozzle 22a that is disposed in the exhaust pipe 5 downstream thereof and sprays urea water into the exhaust pipe 5, and its A urea selective catalyst (urea SCR) 23a, a diesel particulate filter (DPF) 20a, and a rear oxidation catalyst (R-DOC: Rear : Diesel Oxidation Catalyst) 24a disposed in the downstream exhaust pipe 5 are accommodated. 2 casing 25a.
  • DOC oxidation catalyst
  • the DOC 19a has a function of oxidizing and purifying CO and HC in exhaust gas and oxidizing NO.
  • the urea injection nozzle 22a has a function of generating ammonia (NH 3 ) by hydrolysis or thermal decomposition of urea water sprayed in the exhaust pipe 5.
  • the urea SCR 23a has a function of detoxifying water and nitrogen by reducing the NOx in the exhaust gas with ammonia
  • the DPF 20a has a function of collecting PM in the exhaust gas
  • the R-DOC 24a In addition, it has a function of oxidizing and detoxifying ammonia flowing out from the urea SCR 23a.
  • all of the post-processing units (DOC 19a, urea injection nozzle 22a, SCR 23a, DPF 20a, R-DOC 24a) constituting the exhaust purification device 17a are disposed on the downstream side of the low-pressure turbine 13.
  • the distance from the exhaust port of the diesel engine 1 to the exhaust purification device 17a is long. Therefore, the exhaust gas flowing out from the exhaust port of the diesel engine 1 is dissipated when passing through the exhaust pipe 5, expands in the low-pressure turbine 13, and then reaches the exhaust purification device 17 a.
  • the temperatures of the DOC 19a, the SCR 23a, the DPF 20a, and the R-DOC 24a may not rise to the catalyst activation temperature.
  • the average inlet temperature of the DOC 19a, SCR 23a, and DPF 20a is about 150 ° C. for the DOC 19a, about 140 ° C. for the SCR 23a, and about 140 ° C. for the DPF 20a. It became about 125 ° C.
  • the HC purification rate of the DOC 19a is about 10% (the CO purification rate is the same)
  • the NOx purification rate of the SCR 23a is about 40%.
  • the average purification rate in the JE05 mode was 50% or less for all of HC, CO, and NOx.
  • the urea injection position of the SCR 23a is changed from the urea injection position of the urea injection nozzle 22a.
  • the distance to the entrance is required to be a predetermined distance (in the experiment, it was found that 25 cm or more is necessary). This leads to a decrease in the temperature of the SCR 23a and an increase in the size of the exhaust purification device 17a.
  • the exhaust gas purification device 17 of the diesel engine 1 is disposed in the exhaust passage 7 of the diesel engine 1 and is a preceding stage that purifies CO and HC in exhaust gas and oxidizes NO.
  • An oxidation catalyst (DOC) 19 a urea injection nozzle 22 that is disposed in the exhaust passage 7 downstream of the DOC 19 and generates ammonia by spraying urea water into the exhaust gas, and downstream of the urea injection nozzle 22 are disposed in the exhaust passage 7 and are disposed in the exhaust passage 7 downstream of the low-pressure turbine 13 and a turbine (low-pressure turbine) 13 for stirring the sprayed urea water to promote decomposition of urea.
  • the selective reduction catalyst (urea SCR) 23 detoxified by reducing the NOx with ammonia is disposed in the exhaust passage 7 downstream of the urea SCR 23.
  • the selective reduction catalyst (urea SCR) 23 detoxified by reducing the NOx with ammonia is disposed in the exhaust passage 7 downstream of the urea SCR 23.
  • a downstream oxidation catalyst (R-DOC) 24 for oxidizing and detoxifying the ammonia flowing out from the DPF 20 is disposed in the exhaust passage 7 downstream of the DPF 20.
  • Each post-processing unit (DOC19, urea injection nozzle 22, SCR23, DPF20, R-DOC24) will be described in detail later.
  • a two-stage turbocharger in which a high-pressure stage turbo 8 and a low-pressure stage turbo 9 are connected in series, and a urea injection nozzle 22 is disposed between the low-pressure stage turbine 13 and the high-pressure stage turbine 12,
  • the DOC 19 is arranged upstream of the high-pressure turbine 12, the high-pressure turbo 8 may be omitted and a single-stage turbocharger may be used.
  • a urea injection nozzle 22 is arranged upstream of the turbine (low pressure stage turbine 13 in FIG. 2) of the only turbocharger (low pressure stage turbo 9 in FIG. 2), and upstream of the urea injection nozzle 22.
  • the DOC 19 is arranged.
  • the urea injection nozzle 22 and the DOC 19 are arranged upstream of the low pressure turbine 13, so that all aftertreatment units including the urea injection nozzle 22 and DOC 19 are connected to the low pressure turbine 13.
  • the installation position of each post-processing unit DOC19, SCR23, DPF20, R-DOC24
  • the heat of the exhaust gas can be used effectively, and the temperature of each aftertreatment unit can be easily secured at the catalyst activation temperature.
  • the average inlet temperatures of the DOC19, SCR23, and DPF20 are about 200 ° C for DOC19, about 175 ° C for SCR23, and about 170 ° C for DPF20.
  • the HC purification rate of DOC 19 is approximately 100% at 200 ° C. (the CO purification rate is the same), and the NOx purification rate of SCR 23 is approximately 80% at 175 ° C.
  • the purification rates of HC, CO, and NOx are significantly improved as compared with the comparative example.
  • the DPF 20 is disposed directly below the low-pressure stage turbine 13 via the SCR 23, and the DOC 19a, the urea injection nozzle 22a, and the SCR 23a are disposed downstream of the low-pressure stage turbine 13 as in the comparative example shown in FIG.
  • the installation position of the DPF 20 is further upstream. Therefore, the temperature of the DPF 20 is higher than that of the comparative example, and the PM collected in the DPF 20 can be burned even if the post injection is reduced or the post injection is not performed depending on the operation state. Therefore, it is possible to avoid deterioration of fuel consumption due to post injection and to suppress generation of HC due to post injection.
  • the urea injection nozzle 22 is disposed on the upstream side of the low-pressure stage turbine 13, the urea water sprayed from the urea injection nozzle 22 is stirred by the low-pressure stage turbine 13, and the low-pressure stage turbine 13. Is diffused substantially uniformly on the downstream side. For this reason, hydrolysis and thermal decomposition of urea are promoted, and even when the distance from the urea injection position of the urea injection nozzle 22 to the inlet of the SCR 23 is closer than that of the comparative example, ammonia can be generated appropriately.
  • the installation position of the SCR 23 can be brought closer to the low-pressure turbine 13 than in the comparative example, the temperature of the SCR 23 can be made higher than that in the comparative example, and downsizing of the exhaust purification device 17 can be promoted.
  • the DOC 19 includes a manifold oxidation catalyst (M / F-DOC) 19x disposed in each cylinder portion of the exhaust manifold 4 of the diesel engine 1 and a pre-turbine oxidation catalyst (P / T-) disposed in a collective portion of the exhaust manifold 4.
  • DOC manifold oxidation catalyst
  • the upstream side M / F-DOC19x is more excellent in CO purification than the downstream side P / T-DOC19y, and the downstream side P / T-DOC19y is higher than the upstream side M / F-DOC19x.
  • Those excellent in HC purification are used.
  • DOC generally has better HC adsorption / purification when there is no CO in the exhaust gas, and CO adsorption / purification does not deteriorate even if HC is present in the exhaust gas. This is because it has properties.
  • the M / F-DOC 19x is composed of a catalyst containing an oxide and an oxide semiconductor having an oxygen storage material (OSC: Oxygen Storage Capacity) excellent in CO purification (CO adsorption), and the P / T-DOC 19y is an HC purification ( It consists of a metal catalyst (Pt catalyst etc.) excellent in HC adsorption).
  • the M / F-DOC 19x may be a catalyst layer including a catalyst in which an OSC-containing oxide and an oxide semiconductor are mixed, and the P / T-DOC 19y includes a noble metal catalyst (such as a Pt catalyst) and an HC adsorbent.
  • a catalyst in which is mixed may be used.
  • an oxide containing cerium (Ce) (cerium oxide or the like) is used as the oxide having OSC, and a noble metal (Pt or the like) may be supported on the oxide.
  • the oxide semiconductor TiO 2 , ZnO, or Y 2 O 3 is used.
  • the EGR pipe 15 is connected to the exhaust manifold 4 between the M / F-DOC 19x and the P / T-DOC 19y.
  • the exhaust gas that has passed through the M / F-DOC 19x and has been purified of CO is recirculated to the intake pipe 3 through the EGR pipe 15. Therefore, unburned substances (SOF component: Soluble Organic Fraction Element) in the recirculated exhaust gas are reduced, and adverse effects such as contamination and clogging of the EGR valve 16 and the EGR cooler (not shown) due to SOF can be suppressed.
  • SOF component Soluble Organic Fraction Element
  • the urea injection nozzle 22 is disposed in the exhaust pipe 5 upstream of the low pressure turbine 13. For this reason, the urea water sprayed from the urea injection nozzle 22 is stirred by the low-pressure stage turbine 13 and diffused substantially uniformly on the downstream side of the low-pressure stage turbine 13, and urea hydrolysis and thermal decomposition are promoted. Therefore, the distance from the urea injection position of the urea injection nozzle 22 to the inlet of the SCR 23 can be made closer than that of the comparative example, and as described above, the temperature of the SCR 23 can be increased more than that of the comparative example, and the exhaust purification device 17 downsizing can be promoted.
  • ammonia (NH 3 ) produced by hydrolysis and thermal decomposition of urea water sprayed from the urea injection nozzle 22 reacts with SO 4 in the exhaust gas, and 2NH 3 + SO 4 ⁇ (NH 4 ) 2SO 4 is produced. Since the produced (NH 4 ) 2 SO 4 is a neutralized product, the problem of corrosion of the exhaust pipe 5 and the low-pressure stage turbine 13 does not occur.
  • the (NH 4) 2SO 4 is trapped SCR23 just below the low pressure turbine 13, and the thermal decomposition becomes more than a predetermined temperature (e.g. 120 ° C.) ammonia (NH 3) is produced, the ammonia (NH 3 ) Is used for the reduction reaction of NOx in SCR23.
  • a predetermined temperature e.g. 120 ° C.
  • the SCR 23 is disposed downstream of the low-pressure turbine 13 and has a function of detoxifying water and nitrogen by reducing the NOx in the exhaust gas with ammonia (NH 3 ).
  • a small-sized SCR having a volume per unit volume increased by 50% or more compared to the conventional volume is used by using a catalyst carrier (monolith catalyst) or the like.
  • the SCR 23, DPF 20 and R-DOC 24 are accommodated in a casing 26 formed integrally with the turbine housing of the low-pressure turbine 13, but the casing 26 is separated from the turbine housing. These may be connected by a short exhaust pipe.
  • the DPF 20 is disposed in the casing 26 at a position downstream of the SCR 23, and an oxidation catalyst (noble metal catalyst) for burning (oxidizing) the collected PM is applied to the filter body (with catalyst) DPF) is used.
  • an oxidation catalyst noble metal catalyst
  • the DPF 20 not coated with an oxidation catalyst may be used.
  • the filter body of the DPF 20 has a structure in which the purification characteristics (PM collection characteristics) are the same as those of conventional products and the pressure loss is small by optimizing the porosity, pore diameter, and wall thickness. Due to this improvement, a small DPF whose volume was 50% or more smaller than the conventional product was used.
  • the R-DOC 24 is disposed downstream of the DPF 20 in the casing 26 and has a function of oxidizing and detoxifying excess ammonia (NH 3 ) that has not been consumed by the reduction reaction in the SCR 23 and has passed through the DPF 20. Have.
  • the spray amount of urea water may be controlled in accordance with the operation state of the diesel engine 1 so that all ammonia (NH 3 ) generated by the urea water sprayed from the urea injection nozzle 22 is consumed by the SCR 23. , R-DOC24 can be omitted.

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