WO2016006655A1 - Système de purification d'air - Google Patents

Système de purification d'air Download PDF

Info

Publication number
WO2016006655A1
WO2016006655A1 PCT/JP2015/069766 JP2015069766W WO2016006655A1 WO 2016006655 A1 WO2016006655 A1 WO 2016006655A1 JP 2015069766 W JP2015069766 W JP 2015069766W WO 2016006655 A1 WO2016006655 A1 WO 2016006655A1
Authority
WO
WIPO (PCT)
Prior art keywords
oxidation catalyst
exhaust
catalyst
exhaust system
downstream
Prior art date
Application number
PCT/JP2015/069766
Other languages
English (en)
Japanese (ja)
Inventor
朗義 工藤
英二 矢幡
幸広 池本
久仁男 野田
信貴 石井
真治 原
尊史 長谷山
哲也 村田
信一 井上
Original Assignee
いすゞ自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by いすゞ自動車株式会社 filed Critical いすゞ自動車株式会社
Publication of WO2016006655A1 publication Critical patent/WO2016006655A1/fr

Links

Images

Classifications

    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • 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 purification system.
  • Patent Document 1 discloses, in order from the exhaust upstream side, a pre-stage oxidation catalyst, a diesel particulate filter (hereinafter referred to as DPF), a middle-stage oxidation catalyst, a selective reduction catalyst (hereinafter referred to as SCR catalyst), The structure which has arrange
  • DPF diesel particulate filter
  • SCR catalyst selective reduction catalyst
  • particulate matter (hereinafter referred to as PM) and nitrogen compound (hereinafter referred to as NOx) in exhaust gas are simultaneously purified, and high-temperature exhaust gas is introduced into a bypass passage at high exhaust temperature to form a middle-stage oxidation catalyst.
  • high-temperature exhaust gas is introduced into a bypass passage at high exhaust temperature to form a middle-stage oxidation catalyst.
  • An object of the present invention is to effectively suppress an increase in size and cost of the apparatus by omitting the DPF and simplifying the entire structure.
  • an exhaust purification system of the present invention includes a first oxidation catalyst provided in an exhaust system of an internal combustion engine and capable of generating nitrogen dioxide (NO2) from nitrogen monoxide (NO), and the first oxidation catalyst.
  • a second oxidation catalyst provided in the exhaust system downstream of the oxidation catalyst and capable of oxidizing soluble organic components (SOF); and provided in an exhaust system downstream of the second oxidation catalyst and produced from urea water.
  • SOF oxidizing soluble organic components
  • combustion control means for controlling the fuel injection of the internal combustion engine by multistage injection to reduce the soot component in the exhaust discharged from the internal combustion engine.
  • a third oxidation catalyst that is provided in an exhaust system downstream of the selective reduction catalyst and can oxidize ammonia (NH 3) desorbed from the selective reduction catalyst may be further provided.
  • each cylinder of a diesel engine (hereinafter simply referred to as an engine) 10 is provided with an injector 11 that directly injects high-pressure fuel pressured by a common rail (not shown) into each cylinder.
  • the fuel injection amount and fuel injection timing of each injector 11 are controlled according to an instruction signal input from an electronic control unit (hereinafter referred to as ECU) 60.
  • ECU electronice control unit
  • An intake passage 12 for introducing fresh air is connected to the intake manifold 10A of the engine 10.
  • An exhaust passage 16 for leading the exhaust is connected to the exhaust manifold 10B.
  • the exhaust passage 16 is provided with a pre-stage post-treatment device 30, a post-stage post-treatment device 40, and the like in order from the exhaust upstream side.
  • the pre-stage post-processing apparatus 30 is configured by arranging a first oxidation catalyst 31 and a second oxidation catalyst 32 in order from the upstream side in a case 30A.
  • a case 30 ⁇ / b> A upstream of the first oxidation catalyst 31 is provided with a first exhaust temperature sensor 50 that detects an inlet exhaust temperature of the first oxidation catalyst 31.
  • the case 30A between the first oxidation catalyst 31 and the second oxidation catalyst 32 is provided with a second exhaust temperature sensor 51 that detects the inlet exhaust temperature of the second oxidation catalyst. The sensor values of these sensors 50 and 51 are transmitted to the electrically connected ECU 60.
  • the first oxidation catalyst 31 is formed, for example, by supporting a NO2 generating catalyst or the like on a porous ceramic carrier, and functions to generate NO2 from NO contained in the exhaust, and unburned hydrocarbons supplied by post injection. It has a function of oxidizing (HC).
  • the second oxidation catalyst 32 is formed by, for example, supporting a SOF oxidation catalyst on a porous ceramic carrier, and has a function of oxidizing and purifying mainly SOF components in PM contained in the exhaust gas.
  • the post-stage post-treatment device 40 is configured by arranging a SCR catalyst 41 and a third oxidation catalyst 42 in order from the upstream side in the case 40A.
  • the exhaust passage 16 upstream of the SCR catalyst 41 is provided with a urea addition valve 44 of the urea water injector 43 and a NOx sensor 52 that detects the NOx value in the exhaust gas flowing into the SCR catalyst 41.
  • a third exhaust temperature sensor 53 that detects the inlet exhaust temperature of the SCR catalyst 41 is provided in the exhaust passage 16 upstream of the SCR catalyst 41. The sensor values of these sensors 52 and 53 are transmitted to the electrically connected ECU 60.
  • the urea water injection device 43 opens and closes the urea addition valve 44 in response to an instruction signal input from the ECU 60, so that the urea water is supplied from the urea water tank 45 into the exhaust passage 16 upstream of the SCR catalyst 41.
  • the urea water pumped by the pump 46 is injected.
  • the injected urea water is hydrolyzed by exhaust heat to be generated as NH3, and supplied to the SCR catalyst 41 on the downstream side as a reducing agent.
  • the SCR catalyst 41 is formed, for example, by supporting zeolite or the like on a porous ceramic carrier.
  • the SCR catalyst 41 adsorbs NH3 supplied as a reducing agent from the urea water injection device 43, and selectively reduces and purifies NOx from the exhaust gas passing through the adsorbed NH3.
  • the third oxidation catalyst 42 is formed, for example, by supporting an oxidation catalyst on a porous ceramic carrier, and has a function of oxidizing NH 3 slipped downstream from the SCR catalyst 41.
  • the ECU 60 performs various controls of the engine 10 and the like, and includes a known CPU, ROM, RAM, input port, output port, and the like. Further, as shown in FIG. 2, the ECU 60 includes a PM reduction combustion control unit 61 as a part of functional elements.
  • the PM reduction combustion control unit 61 executes PM reduction injection control for mainly reducing soot components in PM contained in exhaust gas by controlling the fuel injection of each injector 11 by multi-injection.
  • the soot component in the PM is reduced by the combustion control of the engine 10, and the SOF component in the PM is oxidized and purified by the second oxidation catalyst 32, so that the DPM is omitted even if the DPF is omitted. It is configured to effectively suppress the release to the atmosphere.
  • control for increasing the supercharging pressure by adjusting the opening of a variable capacity supercharger or EGR device may be executed.
  • the exhaust purification system of this embodiment includes a first oxidation catalyst 31 that generates NO2 in order from the exhaust upstream side, and a second oxidation catalyst 32 that oxidizes and purifies SOF components in PM mainly composed of unburned fuel, lubricating oil, and the like.
  • a SCR catalyst 41 for reducing and purifying NOx and a third oxidation catalyst 42 for preventing NH3 slip are arranged.
  • fuel injection of the engine 10 is controlled by PM reduction injection that mainly reduces soot components in PM by multi-injection. That is, the exhaust emission performance can be effectively maintained without using the DPF by reducing the soot component in the PM by the combustion control of the engine 10 and purifying the SOF component by the second oxidation catalyst 32. ing. Therefore, it is possible to omit the DPF, and it is possible to effectively suppress an increase in size and cost of the apparatus.
  • the DPF eliminates the need for periodic cleaning of the DPF for removing ash, and the maintenance performance can be effectively improved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Toxicology (AREA)
  • Analytical Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

L'invention vise à améliorer les résultats d'émission tout en évitant que les dimensions ou le prix d'un dispositif ne soient augmentés, le présent système de purification d'air étant doté d'un premier catalyseur d'oxydation (31) qui est disposé dans un système d'échappement (16) d'un moteur à combustion interne (10) et qui peut générer du NO2 à partir de NO, d'un second catalyseur d'oxydation (32) qui est disposé dans le système d'échappement (16) en aval du premier catalyseur d'oxydation (31) et qui peut oxyder du SOF et d'un catalyseur de réduction sélective (41) qui est disposé dans le système d'échappement (16) en aval du second catalyseur d'oxydation (32) et qui réduit et purifie le NOx dans les gaz d'échappement avec le NH3 généré à partir d'eau d'urée comme agent réducteur.
PCT/JP2015/069766 2014-07-11 2015-07-09 Système de purification d'air WO2016006655A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-143486 2014-07-11
JP2014143486A JP2016020636A (ja) 2014-07-11 2014-07-11 排気浄化システム

Publications (1)

Publication Number Publication Date
WO2016006655A1 true WO2016006655A1 (fr) 2016-01-14

Family

ID=55064283

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/069766 WO2016006655A1 (fr) 2014-07-11 2015-07-09 Système de purification d'air

Country Status (2)

Country Link
JP (1) JP2016020636A (fr)
WO (1) WO2016006655A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09122489A (ja) * 1995-11-07 1997-05-13 Nissan Motor Co Ltd ディーゼルエンジン用酸化触媒
JP2005288362A (ja) * 2004-04-01 2005-10-20 Ne Chemcat Corp ディーゼルエンジン排気ガス浄化装置
US20060233679A1 (en) * 2005-04-14 2006-10-19 Benteler Automobiletechnik Gmbh Device for exhaust emission purification for vehicles and production method thereof
JP2009041430A (ja) * 2007-08-08 2009-02-26 Isuzu Motors Ltd ＮＯｘ浄化方法及びＮＯｘ浄化システム
JP2010516948A (ja) * 2007-01-31 2010-05-20 ユミコア・アクチエンゲゼルシャフト・ウント・コムパニー・コマンディットゲゼルシャフト リーンエンジンの排ガス装置内のすすフィルタを再生する方法及びこのための排ガス装置
WO2012002052A1 (fr) * 2010-06-30 2012-01-05 エヌ・イー ケムキャット株式会社 Dispositif d'épuration des gaz de combustion et procédé d'épuration des gaz de combustion utilisant un catalyseur sélectif de réduction catalytique
JP2012092675A (ja) * 2010-10-25 2012-05-17 Isuzu Motors Ltd 内燃機関の制御装置
WO2012147376A1 (fr) * 2011-04-28 2012-11-01 エヌ・イー ケムキャット株式会社 Dispositif de purification de gaz de dégagement
WO2012150468A1 (fr) * 2011-05-04 2012-11-08 T Baden Hardstaff Limited Contrôle de la température de l'échappement
JP2013002283A (ja) * 2011-06-10 2013-01-07 Hitachi Constr Mach Co Ltd 排気浄化装置

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09122489A (ja) * 1995-11-07 1997-05-13 Nissan Motor Co Ltd ディーゼルエンジン用酸化触媒
JP2005288362A (ja) * 2004-04-01 2005-10-20 Ne Chemcat Corp ディーゼルエンジン排気ガス浄化装置
US20060233679A1 (en) * 2005-04-14 2006-10-19 Benteler Automobiletechnik Gmbh Device for exhaust emission purification for vehicles and production method thereof
JP2010516948A (ja) * 2007-01-31 2010-05-20 ユミコア・アクチエンゲゼルシャフト・ウント・コムパニー・コマンディットゲゼルシャフト リーンエンジンの排ガス装置内のすすフィルタを再生する方法及びこのための排ガス装置
JP2009041430A (ja) * 2007-08-08 2009-02-26 Isuzu Motors Ltd ＮＯｘ浄化方法及びＮＯｘ浄化システム
WO2012002052A1 (fr) * 2010-06-30 2012-01-05 エヌ・イー ケムキャット株式会社 Dispositif d'épuration des gaz de combustion et procédé d'épuration des gaz de combustion utilisant un catalyseur sélectif de réduction catalytique
JP2012092675A (ja) * 2010-10-25 2012-05-17 Isuzu Motors Ltd 内燃機関の制御装置
WO2012147376A1 (fr) * 2011-04-28 2012-11-01 エヌ・イー ケムキャット株式会社 Dispositif de purification de gaz de dégagement
WO2012150468A1 (fr) * 2011-05-04 2012-11-08 T Baden Hardstaff Limited Contrôle de la température de l'échappement
JP2013002283A (ja) * 2011-06-10 2013-01-07 Hitachi Constr Mach Co Ltd 排気浄化装置

Also Published As

Publication number Publication date
JP2016020636A (ja) 2016-02-04

Similar Documents

Publication Publication Date Title
JP4274270B2 (ja) ＮＯｘ浄化システム及びＮＯｘ浄化システムの制御方法
JP4947036B2 (ja) エンジンの排気浄化方法
JP5630024B2 (ja) ディーゼルエンジンの排気浄化装置及び排気浄化方法
JP5118331B2 (ja) 排気浄化装置
JP5763294B2 (ja) 排気浄化装置
JP5630025B2 (ja) ディーゼルエンジンの排気浄化装置及び排気浄化方法
WO2014136832A1 (fr) Procédé de commande pour dispositif de post-traitement de gaz d'échappement
JP3788501B2 (ja) 内燃機関の排気浄化装置
JP2013142363A (ja) ディーゼルエンジンの排気ガス浄化装置
US8327624B2 (en) System for purifying exhaust gas
US11346266B2 (en) Engine exhaust aftertreatment device and method
US20130031892A1 (en) Exhaust gas purification device and control method for exhaust gas purification device
US10174702B2 (en) Regeneration device for exhaust-gas purifying device
JP5251711B2 (ja) 内燃機関の排気浄化装置
JP2012102684A (ja) エンジンの排気浄化装置
JP2013079638A (ja) エンジンの排気浄化装置
JP2016211486A (ja) 排出ガス浄化システム
JP4375311B2 (ja) 内燃機関の排気浄化システム
JP2010196551A (ja) 内燃機関の排気浄化装置
WO2014125870A1 (fr) Dispositif de purification de gaz d'échappement de moteur
JP2016079861A (ja) 内燃機関のＮＯｘ浄化システム
JP2010185369A (ja) エンジンの燃料供給装置
JP2008128066A (ja) 排気浄化装置
JP6398402B2 (ja) 排気浄化システム
WO2016006655A1 (fr) Système de purification d'air

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15819106

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15819106

Country of ref document: EP

Kind code of ref document: A1