WO2013072982A1 - Exhaust gas purification device for internal combustion engine - Google Patents

Exhaust gas purification device for internal combustion engine Download PDF

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Publication number
WO2013072982A1
WO2013072982A1 PCT/JP2011/076167 JP2011076167W WO2013072982A1 WO 2013072982 A1 WO2013072982 A1 WO 2013072982A1 JP 2011076167 W JP2011076167 W JP 2011076167W WO 2013072982 A1 WO2013072982 A1 WO 2013072982A1
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Prior art keywords
reducing agent
exhaust
passage
exhaust gas
check valve
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PCT/JP2011/076167
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French (fr)
Japanese (ja)
Inventor
寛真 西岡
中山　茂樹
寛 大月
佳久 塚本
潤一 松尾
大地 今井
伊藤　和浩
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トヨタ自動車株式会社
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Priority to PCT/JP2011/076167 priority Critical patent/WO2013072982A1/en
Publication of WO2013072982A1 publication Critical patent/WO2013072982A1/en

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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]
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes characterised by a specific device
    • 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
    • B01D2251/2062—Ammonia
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/06—Adding substances to exhaust gases the substance being in the gaseous form
    • 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
    • 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
    • F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
    • 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 apparatus for an internal combustion engine including a selective reduction type NOx catalyst provided in an exhaust passage.
  • Patent Document 1 discloses a technique in which a solid or liquid reducing agent stored in a storage unit is heated, and a gaseous reducing agent generated thereby is supplied upstream of a NOx catalyst in an exhaust passage.
  • Patent Document 2 an injector is fixed in a state in which a tip portion is exposed in a communication passage that is communicated with an exhaust passage between a turbocharger and an exhaust purification catalyst, and the injector is passed through the communication passage from the injector.
  • a configuration for injecting an additive into an exhaust passage is disclosed.
  • Patent Document 2 further discloses a technique for supplying air from the intake passage to the communication passage through a supply passage having one end connected to the communication passage and the other end connected to the intake passage.
  • Patent Document 2 also discloses a technique in which a control valve for controlling the flow of air is provided in the communication passage, and a check valve for preventing a backflow of exhaust gas is provided on the communication passage side of the control valve.
  • Patent Document 3 discloses that urea water in the urea water injection nozzle is collected when the precipitate is clogged in the urea water injection nozzle provided in the exhaust passage, and then the urea water injection nozzle is moved by the heat of the exhaust gas.
  • a technique for decomposing the precipitate in the urea water injection nozzle into a gas by heating is disclosed.
  • the present invention has been made in view of the above-described problems, and adds a gaseous reducing agent into the exhaust gas from the adding device so as to supply the reducing agent to the NOx catalyst provided in the exhaust passage of the internal combustion engine.
  • An object of the present invention is to prevent the flow path of the reducing agent in the addition apparatus from being blocked by the compound of the component contained in the exhaust gas and the reducing agent.
  • An internal combustion engine exhaust gas purification apparatus is A selective reduction NOx catalyst provided in an exhaust passage of the internal combustion engine; A reducing agent supply passage connected to an exhaust passage upstream of the selective reduction NOx catalyst; An addition device that is provided in the reducing agent supply passage and adds the reducing agent to the exhaust gas flowing through the exhaust passage by supplying a gaseous reducing agent to the reducing agent supply passage; A check that is provided at a predetermined position between the connecting portion with the exhaust passage and the addition device in the reducing agent supply passage and prevents a gas flow in a direction opposite to the direction from the addition device to the exhaust passage. A valve, and Position at which the temperature of the check valve can be increased by receiving heat from the exhaust gas until the predetermined position is adhered to the check valve and the compound of the component contained in the exhaust gas and the reducing agent is removed. It is.
  • An exhaust emission control device for an internal combustion engine A selective reduction NOx catalyst provided in an exhaust passage of the internal combustion engine; A reducing agent supply passage connected to an exhaust passage upstream of the selective reduction NOx catalyst; An addition device that is provided in the reducing agent supply passage and adds the reducing agent to the exhaust gas flowing through the exhaust passage by supplying a gaseous reducing agent to the reducing agent supply passage; A check valve that is provided between the connecting portion of the reducing agent supply passage with the exhaust passage and the addition device, and prevents a gas flow in a direction opposite to the direction from the addition device side toward the exhaust passage; And a temperature raising device capable of raising the temperature of the check valve up to a temperature at which the compound of the component contained in the exhaust gas and the reducing agent attached to the check valve is removed.
  • the check valve can prevent the exhaust from reaching the addition device by flowing back through the reducing agent supply passage. Therefore, it is possible to prevent the flow path of the reducing agent in the adding device from being blocked by the compound of the component and the reducing agent contained in the exhaust gas.
  • the reducing agent is supplied from the adding device, it is less likely to be affected by exhaust pulsation. Therefore, the amount of reducing agent added to the exhaust can be controlled with high accuracy.
  • a compound of a component contained in exhaust gas and a reducing agent may be generated around the check valve.
  • this compound can be removed. For this reason, it is possible to suppress the occurrence of a malfunction of the check valve due to the adhesion of the compound.
  • the present invention it is possible to prevent the flow path of the reducing agent in the addition apparatus from being blocked by the compound of the component contained in the exhaust gas and the reducing agent.
  • FIG. 1 is a diagram illustrating a schematic configuration of an intake / exhaust system of an internal combustion engine according to Embodiment 1.
  • FIG. 3 is a diagram illustrating a schematic configuration of an intake / exhaust system of an internal combustion engine according to a second embodiment.
  • Example 1 a case where the present invention is applied to an exhaust gas purification system for a diesel engine for driving a vehicle will be described as an example.
  • the internal combustion engine according to the present invention is not limited to a diesel engine, and may be a gasoline engine or the like.
  • FIG. 1 is a diagram showing a schematic configuration of an intake / exhaust system of an internal combustion engine according to the present embodiment.
  • the internal combustion engine 1 is a diesel engine for driving a vehicle.
  • An intake passage 2 and an exhaust passage 3 are connected to the internal combustion engine 1.
  • an air flow meter 4 and a throttle valve 5 are provided in the intake passage 2.
  • the air flow meter 4 detects the intake air amount of the internal combustion engine 1.
  • the throttle valve 5 adjusts the flow rate of the intake air flowing through the intake passage 2 by changing the cross-sectional area of the intake passage 2.
  • a NOx catalyst 7 is provided in the exhaust passage 3.
  • the NOx catalyst 7 is a selective reduction type NOx catalyst that reduces NOx in exhaust gas using ammonia as a reducing agent.
  • An oxidation catalyst 6 is provided in the exhaust passage 3 upstream of the NOx catalyst 7 as a pre-stage catalyst.
  • the pre-stage catalyst is not limited to the oxidation catalyst, and may be a catalyst having an oxidation function (for example, an occlusion reduction type NOx catalyst).
  • a pressure sensor 12 and a NOx sensor 13 are provided in the exhaust passage 3 downstream from the oxidation catalyst 6 and upstream from the NOx catalyst 7.
  • the pressure sensor 12 detects the pressure of the exhaust flowing through the exhaust passage 3.
  • the NOx sensor 13 detects the NOx concentration of the exhaust flowing through the exhaust passage 3.
  • a reducing agent supply passage 9 is connected to the exhaust passage 3 downstream from the oxidation catalyst 6 and upstream from the NOx catalyst 7.
  • An addition valve 8 for adding a reducing agent is provided at the other end of the reducing agent supply passage 9. The addition valve 8 injects gaseous ammonia as a reducing agent.
  • the addition valve 8 is connected to one end of an ammonia passage 21.
  • the other end of the ammonia passage 21 is connected to the tank 20.
  • the tank 20 stores gaseous ammonia. Gaseous ammonia is supplied from the tank 20 to the addition valve 8 through the ammonia passage 21.
  • a pressure regulating valve 22 is provided in the ammonia passage 21. The pressure of ammonia supplied to the addition valve 8 is adjusted by the pressure regulating valve 22.
  • a storage unit for storing solid or liquid ammonia compounds may be provided separately from the tank 20.
  • the ammonia compound stored in the storage unit is heated to generate gaseous ammonia, and the generated gaseous ammonia is stored in the tank 20.
  • a solid or liquid ammonia compound may be stored in the tank 20, and gaseous ammonia may be generated by forming a solid or liquid ammonia compound in the tank 20.
  • a check valve 14 is provided at a predetermined position in the middle of the reducing agent supply passage 9 (that is, between the connection portion with the exhaust passage 3 and the addition valve 8).
  • the check valve 14 is a valve that prevents the gas flow in the direction opposite to the direction from the addition valve side to the exhaust passage side. The installation position of the check valve 14 in the reducing agent supply passage 9 will be described later.
  • gaseous ammonia is injected from the addition valve 8 into the reducing agent supply passage 9 when ammonia as the reducing agent is to be supplied to the NOx catalyst 7.
  • the injected ammonia passes through the reducing agent supply passage 9, passes through the check valve 14, and is added to the exhaust gas flowing through the exhaust passage 3.
  • the internal combustion engine 1 is provided with an electronic control unit (ECU) 10 for controlling the internal combustion engine 1.
  • ECU electronice control unit
  • An air flow meter 4, a pressure sensor 12, and a NOx sensor 13 are electrically connected to the ECU 10.
  • a crank position sensor 11 of the internal combustion engine 1 is electrically connected to the ECU 10. And the output signal of each sensor is input into ECU10.
  • the ECU 10 derives the engine speed of the internal combustion engine 1 based on the output value of the crank position sensor 11.
  • the throttle valve 5, the addition valve 8, and the pressure regulating valve 22 are electrically connected to the ECU 10. The operation of these devices is controlled by the ECU 10.
  • a compound for example, (NH 4 ) 2 SO 4 , NH 4 NO 3 , (NH 4 ) 2 ) of ammonia remaining in the addition valve 8 and components contained in the exhaust. CO 3 ) may be generated. If such a compound is generated in the addition valve 8, the ammonia flow path in the addition valve 8 may be blocked by the compound.
  • a check valve 14 is provided at a predetermined position in the middle of the reducing agent supply passage 9. Thereby, it is possible to suppress the exhaust from reaching the addition valve 8 by flowing backward through the reducing agent supply passage 9. As a result, it is possible to suppress the exhaust from entering the addition valve 8. Therefore, in the addition valve 8, it can suppress that the compound of the component contained in exhaust_gas
  • the check valve 14 can also suppress the particulate matter (PM) in the exhaust from reaching the addition valve 8. Therefore, it is possible to suppress PM from accumulating on the addition valve 8.
  • PM particulate matter
  • the check valve 14 can suppress the pulsation of the exhaust gas from being transmitted through the reducing agent supply passage 9 to the addition valve 8. Therefore, when ammonia is injected from the addition valve 8, it is less likely to be affected by exhaust pulsation. Accordingly, it is possible to control the amount of ammonia added to the exhaust gas with high accuracy.
  • the check valve 14 has a temperature not lower than the melting point of the compound of ammonia and the component contained in the exhaust gas in the reducing agent supply passage 9, and the temperature of the check valve 14 is received by heat from the exhaust gas. It is provided at a position where it can rise.
  • the temperature of the check valve 14 is raised to a higher temperature by receiving heat from the exhaust.
  • (NH 4 ) 2 SO 4 has a melting point of 235 ° C.
  • NH 4 NO 3 has a melting point of 170 ° C.
  • (NH 4 ) 2 CO 3 has a melting point of 58 ° C. Therefore, the check valve 14 may be installed at a position where the temperature of the check valve 14 can be raised to 235 ° C. or higher by receiving heat from the exhaust.
  • the configuration according to the present embodiment can also be applied when a gas other than ammonia is used as the reducing agent.
  • FIG. 2 is a diagram showing a schematic configuration of an intake / exhaust system of the internal combustion engine according to the present embodiment. Only differences from the first embodiment will be described below.
  • a check valve 14 is provided between the connecting portion of the reducing agent supply passage 9 and the exhaust passage 3 and the addition valve 8.
  • the check valve 14 is provided with an electric heater 15 for heating the check valve 14.
  • the electric heater 15 can raise the temperature of the check valve 14 to a temperature equal to or higher than the melting point of the compound of ammonia and the component contained in the exhaust gas.
  • the electric heater 15 is electrically connected to the ECU 10 and its operation is controlled by the ECU 10.
  • the check valve 14 can be provided at an arbitrary position as long as it is between the connecting portion of the reducing agent supply passage 9 and the exhaust passage 3 and the addition valve 8.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Combustion & Propulsion (AREA)
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Abstract

The purpose of the present invention is to prevent a flow path for a gaseous reducing agent in an addition unit from being blocked by a compound of a component contained in an exhaust gas and the reducing agent in a configuration in which the reducing agent is added into the exhaust gas from the addition unit in order to supply the reducing agent to a selective reduction type NOx catalyst. In the present invention, an addition unit is provided in a reducing agent supply passage connected to an exhaust passage on the upstream side from a selective reduction type NOx catalyst. Further, a check valve for blocking the flow of gas in a direction opposite to a direction from the addition unit side to the exhaust passage side is provided at a predetermined position between a connection portion with the exhaust passage and the addition unit in the reducing agent supply passage. The predetermined position is a position at which the temperature of the check valve can be increased by heat received from an exhaust gas to a temperature at which a compound of a component contained in the exhaust gas and the reducing agent and adhering to the check valve is removed.

Description

内燃機関の排気浄化装置Exhaust gas purification device for internal combustion engine
　本発明は、排気通路に設けられた選択還元型ＮＯｘ触媒を備える内燃機関の排気浄化装置に関する。 The present invention relates to an exhaust gas purification apparatus for an internal combustion engine including a selective reduction type NOx catalyst provided in an exhaust passage.
　内燃機関の排気浄化システムとして、排気通路に設けられた選択還元型ＮＯｘ触媒（以下、単にＮＯｘ触媒と称する場合もある）を備えたシステムが知られている。また、このような排気浄化システムにおいて、気体の還元剤をＮＯｘ触媒に供給する技術が開発されている。 2. Description of the Related Art As an exhaust gas purification system for an internal combustion engine, a system including a selective reduction type NOx catalyst (hereinafter sometimes simply referred to as a NOx catalyst) provided in an exhaust passage is known. In such an exhaust purification system, a technique for supplying a gaseous reducing agent to the NOx catalyst has been developed.
　特許文献１には、貯蔵部に貯蔵された固体又は液体の還元剤を加熱し、それによって発生した気体の還元剤を、排気通路におけるＮＯｘ触媒より上流側に供給する技術が開示されている。 Patent Document 1 discloses a technique in which a solid or liquid reducing agent stored in a storage unit is heated, and a gaseous reducing agent generated thereby is supplied upstream of a NOx catalyst in an exhaust passage.
　また、特許文献２には、ターボチャージャと排気浄化触媒との間の排気通路に連通された連通路内に先端部が露出した状態でインジェクタが固定されており、該インジェクタから連通路を介して排気通路に添加剤を噴射する構成が開示されている。特許文献２には、さらに、一端が連通路に接続され他端が吸気通路に接続された供給路を介して吸気通路から連通路に空気を供給する技術が開示されている。また、特許文献２には、連通路において、空気の流れを制御する制御弁を設けると共に、該制御弁の連通路側に排気の逆流を防止する逆止弁を設ける技術も開示されている。 Further, in Patent Document 2, an injector is fixed in a state in which a tip portion is exposed in a communication passage that is communicated with an exhaust passage between a turbocharger and an exhaust purification catalyst, and the injector is passed through the communication passage from the injector. A configuration for injecting an additive into an exhaust passage is disclosed. Patent Document 2 further discloses a technique for supplying air from the intake passage to the communication passage through a supply passage having one end connected to the communication passage and the other end connected to the intake passage. Patent Document 2 also discloses a technique in which a control valve for controlling the flow of air is provided in the communication passage, and a check valve for preventing a backflow of exhaust gas is provided on the communication passage side of the control valve.
　また、特許文献３には、排気通路に設けられた尿素水噴射ノズルに析出物が詰まった場合に、尿素水噴射ノズル内の尿素水を回収し、その後、尿素水噴射ノズルを排気の熱によって加熱することで尿素水噴射ノズル内の析出物を気体に分解する技術が開示されている。 Patent Document 3 discloses that urea water in the urea water injection nozzle is collected when the precipitate is clogged in the urea water injection nozzle provided in the exhaust passage, and then the urea water injection nozzle is moved by the heat of the exhaust gas. A technique for decomposing the precipitate in the urea water injection nozzle into a gas by heating is disclosed.
特開２０１０－１３８８８３号公報JP 2010-138883 A 特開２０１０－０５９８０４号公報JP 2010-059804 A 特開２００７－０００７８２号公報JP 2007-000782 A
 　内燃機関の排気通路に設けられたＮＯｘ触媒に還元剤を供給すべく、添加装置から排気中に気体の還元剤を添加する構成においては、添加装置内に排気が侵入すると、該添加装置の内部において排気に含まれる成分と還元剤との化合物が生成される場合がある。このような化合物が生成されると、添加装置内における還元剤の流路が該化合物によって閉塞される虞がある。 In the configuration in which a gaseous reducing agent is added into the exhaust gas from the adding device to supply the reducing agent to the NOx catalyst provided in the exhaust passage of the internal combustion engine, if the exhaust enters the adding device, the inside of the adding device In some cases, a compound of a component contained in exhaust gas and a reducing agent may be generated. When such a compound is produced, there is a possibility that the flow path of the reducing agent in the addition apparatus is blocked by the compound.
　添加装置内における還元剤の流路が該化合物によって閉塞されると、排気中への還元剤の添加量を目標値に制御することが困難となる。その結果、ＮＯｘ触媒におけるＮＯｘの還元が不十分となり、排気特性の悪化を招く虞がある。 If the flow path of the reducing agent in the adding device is blocked by the compound, it becomes difficult to control the amount of reducing agent added to the exhaust gas to the target value. As a result, NOx reduction in the NOx catalyst becomes insufficient, and exhaust characteristics may be deteriorated.
　本発明は、上記のような問題を鑑みてなされたものであって、内燃機関の排気通路に設けられたＮＯｘ触媒に還元剤を供給すべく、添加装置から排気中に気体の還元剤を添加する構成において、添加装置内における還元剤の流路が、排気に含まれる成分と還元剤との化合物によって閉塞されることを抑制することを目的とする。 The present invention has been made in view of the above-described problems, and adds a gaseous reducing agent into the exhaust gas from the adding device so as to supply the reducing agent to the NOx catalyst provided in the exhaust passage of the internal combustion engine. An object of the present invention is to prevent the flow path of the reducing agent in the addition apparatus from being blocked by the compound of the component contained in the exhaust gas and the reducing agent.
　第一の発明に係る内燃機関の排気浄化装置は、
　内燃機関の排気通路に設けられた選択還元型ＮＯｘ触媒と、
　前記選択還元型ＮＯｘ触媒よりも上流側の排気通路に接続された還元剤供給通路と、
　前記還元剤供給通路に設けられ、該還元剤供給通路に気体の還元剤を供給することで、排気通路を流れる排気中に該還元剤を添加する添加装置と、
　前記還元剤供給通路における、排気通路との接続部と前記添加装置との間の所定位置に設けられ、前記添加装置側から排気通路側へ向かう方向とは逆方向のガスの流れを妨げる逆止弁と、を備え、
　前記所定位置が、前記逆止弁に付着した、排気に含まれる成分と還元剤との化合物が除去される温度まで、前記逆止弁の温度が排気からの受熱により上昇することが可能な位置である。 An internal combustion engine exhaust gas purification apparatus according to a first invention is
A selective reduction NOx catalyst provided in an exhaust passage of the internal combustion engine;
A reducing agent supply passage connected to an exhaust passage upstream of the selective reduction NOx catalyst;
An addition device that is provided in the reducing agent supply passage and adds the reducing agent to the exhaust gas flowing through the exhaust passage by supplying a gaseous reducing agent to the reducing agent supply passage;
A check that is provided at a predetermined position between the connecting portion with the exhaust passage and the addition device in the reducing agent supply passage and prevents a gas flow in a direction opposite to the direction from the addition device to the exhaust passage. A valve, and
Position at which the temperature of the check valve can be increased by receiving heat from the exhaust gas until the predetermined position is adhered to the check valve and the compound of the component contained in the exhaust gas and the reducing agent is removed. It is.
　第二の発明に係る内燃機関の排気浄化装置は、
　内燃機関の排気通路に設けられた選択還元型ＮＯｘ触媒と、
　前記選択還元型ＮＯｘ触媒よりも上流側の排気通路に接続された還元剤供給通路と、
　前記還元剤供給通路に設けられ、該還元剤供給通路に気体の還元剤を供給することで、排気通路を流れる排気中に該還元剤を添加する添加装置と、
　前記還元剤供給通路における、排気通路との接続部と前記添加装置との間に設けられ、前記添加装置側から排気通路側へ向かう方向とは逆方向のガスの流れを妨げる逆止弁と、
　前記逆止弁に付着した、排気に含まれる成分と還元剤との化合物が除去される温度まで、前記逆止弁の温度を上昇させることが可能な昇温装置と、と備えている。 An exhaust emission control device for an internal combustion engine according to a second invention
A selective reduction NOx catalyst provided in an exhaust passage of the internal combustion engine;
A reducing agent supply passage connected to an exhaust passage upstream of the selective reduction NOx catalyst;
An addition device that is provided in the reducing agent supply passage and adds the reducing agent to the exhaust gas flowing through the exhaust passage by supplying a gaseous reducing agent to the reducing agent supply passage;
A check valve that is provided between the connecting portion of the reducing agent supply passage with the exhaust passage and the addition device, and prevents a gas flow in a direction opposite to the direction from the addition device side toward the exhaust passage;
And a temperature raising device capable of raising the temperature of the check valve up to a temperature at which the compound of the component contained in the exhaust gas and the reducing agent attached to the check valve is removed.
　これらの発明によれば、逆止弁によって、還元剤供給通路を逆流して排気が添加装置に到達することを抑制することができる。従って、排気に含まれる成分と還元剤との化合物によって、添加装置内における還元剤の流路が閉塞されることを抑制することができる。 According to these inventions, the check valve can prevent the exhaust from reaching the addition device by flowing back through the reducing agent supply passage. Therefore, it is possible to prevent the flow path of the reducing agent in the adding device from being blocked by the compound of the component and the reducing agent contained in the exhaust gas.
　さらに、排気中の粒子状物質が添加装置に堆積することも抑制することができる。また、添加装置から還元剤を供給する際に、排気の脈動の影響を受けにくくなる。そのため、排気中への還元剤の添加量を高精度で制御することが可能となる。 Furthermore, it is possible to suppress the particulate matter in the exhaust from accumulating in the adding device. Further, when the reducing agent is supplied from the adding device, it is less likely to be affected by exhaust pulsation. Therefore, the amount of reducing agent added to the exhaust can be controlled with high accuracy.
　また、逆止弁の周囲においても、排気に含まれる成分と還元剤との化合物が生成される場合がある。しかしながら、上記発明によれば、逆止弁に該化合物が付着したとしても、該化合物を除去することができる。そのため、該化合物の付着に起因する逆止弁の不具合の発生も抑制することができる。 Also, a compound of a component contained in exhaust gas and a reducing agent may be generated around the check valve. However, according to the said invention, even if this compound adheres to a non-return valve, this compound can be removed. For this reason, it is possible to suppress the occurrence of a malfunction of the check valve due to the adhesion of the compound.
　本発明によれば、添加装置内における還元剤の流路が、排気に含まれる成分と還元剤との化合物によって閉塞されることを抑制することができる。 According to the present invention, it is possible to prevent the flow path of the reducing agent in the addition apparatus from being blocked by the compound of the component contained in the exhaust gas and the reducing agent.
実施例１に係る内燃機関の吸排気系の概略構成を示す図である。1 is a diagram illustrating a schematic configuration of an intake / exhaust system of an internal combustion engine according to Embodiment 1. FIG. 実施例２に係る内燃機関の吸排気系の概略構成を示す図である。FIG. 3 is a diagram illustrating a schematic configuration of an intake / exhaust system of an internal combustion engine according to a second embodiment.
　以下、本発明の具体的な実施形態について図面に基づいて説明する。本実施例に記載されている構成部品の寸法、材質、形状、その相対配置等は、特に記載がない限りは発明の技術的範囲をそれらのみに限定する趣旨のものではない。 Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The dimensions, materials, shapes, relative arrangements, and the like of the components described in the present embodiment are not intended to limit the technical scope of the invention to those unless otherwise specified.
　　＜実施例１＞
　ここでは、本発明を、車両駆動用のディーゼルエンジンの排気浄化システムに適用した場合を例に挙げて説明する。尚、本発明に係る内燃機関はディーゼルエンジンに限られるものではなく、ガソリンエンジン等であってもよい。 <Example 1>
Here, a case where the present invention is applied to an exhaust gas purification system for a diesel engine for driving a vehicle will be described as an example. The internal combustion engine according to the present invention is not limited to a diesel engine, and may be a gasoline engine or the like.
　図１は、本実施例に係る内燃機関の吸排気系の概略構成を示す図である。内燃機関１は車両駆動用のディーゼルエンジンである。内燃機関１には、吸気通路２及び排気通路３が接続されている。 FIG. 1 is a diagram showing a schematic configuration of an intake / exhaust system of an internal combustion engine according to the present embodiment. The internal combustion engine 1 is a diesel engine for driving a vehicle. An intake passage 2 and an exhaust passage 3 are connected to the internal combustion engine 1.
　吸気通路２には、エアフローメータ４、及びスロットル弁５が設けられている。エアフローメータ４は内燃機関１の吸入空気量を検出する。スロットル弁５は、吸気通路２の流路断面積を変更することで、該吸気通路２を流通する吸気の流量を調節する。 In the intake passage 2, an air flow meter 4 and a throttle valve 5 are provided. The air flow meter 4 detects the intake air amount of the internal combustion engine 1. The throttle valve 5 adjusts the flow rate of the intake air flowing through the intake passage 2 by changing the cross-sectional area of the intake passage 2.
　排気通路３には、ＮＯｘ触媒７が設けられている。ＮＯｘ触媒７は、アンモニアを還元剤として排気中のＮＯｘを還元する選択還元型ＮＯｘ触媒である。ＮＯｘ触媒７より上流側の排気通路３には、前段触媒として酸化触媒６が設けられている。尚、前段触媒は、酸化触媒に限られるものではなく、酸化機能を有する触媒（例えば、吸蔵還元型ＮＯｘ触媒）であればよい。 In the exhaust passage 3, a NOx catalyst 7 is provided. The NOx catalyst 7 is a selective reduction type NOx catalyst that reduces NOx in exhaust gas using ammonia as a reducing agent. An oxidation catalyst 6 is provided in the exhaust passage 3 upstream of the NOx catalyst 7 as a pre-stage catalyst. The pre-stage catalyst is not limited to the oxidation catalyst, and may be a catalyst having an oxidation function (for example, an occlusion reduction type NOx catalyst).
　酸化触媒６より下流側且つＮＯｘ触媒７より上流側の排気通路３には、圧力センサ１２及びＮＯｘセンサ１３が設けられている。圧力センサ１２は、排気通路３を流れる排気の圧力を検出する。ＮＯｘセンサ１３は、排気通路３を流れる排気のＮＯｘ濃度を検出する。 A pressure sensor 12 and a NOx sensor 13 are provided in the exhaust passage 3 downstream from the oxidation catalyst 6 and upstream from the NOx catalyst 7. The pressure sensor 12 detects the pressure of the exhaust flowing through the exhaust passage 3. The NOx sensor 13 detects the NOx concentration of the exhaust flowing through the exhaust passage 3.
　また、酸化触媒６より下流側且つＮＯｘ触媒７より上流側の排気通路３には、還元剤供給通路９の一端が接続されている。還元剤供給通路９の他端には還元剤を添加する添加弁８が設けられている。添加弁８は、還元剤たる気体のアンモニアを噴射する。 Further, one end of a reducing agent supply passage 9 is connected to the exhaust passage 3 downstream from the oxidation catalyst 6 and upstream from the NOx catalyst 7. An addition valve 8 for adding a reducing agent is provided at the other end of the reducing agent supply passage 9. The addition valve 8 injects gaseous ammonia as a reducing agent.
　添加弁８には、アンモニア通路２１の一端が接続されている。アンモニア通路２１の他端はタンク２０に接続されている。タンク２０には、気体のアンモニアが貯蔵されている。タンク２０からアンモニア通路２１を通して添加弁８に気体のアンモニアが供給される。アンモニア通路２１には、調圧弁２２が設けられている。この調圧弁２２によって、添加弁８に供給されるアンモニアの圧力が調整される。 The addition valve 8 is connected to one end of an ammonia passage 21. The other end of the ammonia passage 21 is connected to the tank 20. The tank 20 stores gaseous ammonia. Gaseous ammonia is supplied from the tank 20 to the addition valve 8 through the ammonia passage 21. A pressure regulating valve 22 is provided in the ammonia passage 21. The pressure of ammonia supplied to the addition valve 8 is adjusted by the pressure regulating valve 22.
　尚、本実施例においては、タンク２０とは別に、固体又は液体のアンモニア化合物を貯蔵する貯蔵部が設けられていてもよい。この場合、該貯蔵部に貯蔵されたアンモニア化合物が加熱されることで気体のアンモニアが生成され、生成された気体のアンモニアがタンク２０に貯蔵される。また、タンク２０に、固体又は液体のアンモニア化合物を貯蔵し、該タンク２０において固体又は液体のアンモニア化合物することで気体のアンモニアを生成してもよい。 In the present embodiment, a storage unit for storing solid or liquid ammonia compounds may be provided separately from the tank 20. In this case, the ammonia compound stored in the storage unit is heated to generate gaseous ammonia, and the generated gaseous ammonia is stored in the tank 20. Alternatively, a solid or liquid ammonia compound may be stored in the tank 20, and gaseous ammonia may be generated by forming a solid or liquid ammonia compound in the tank 20.
　還元剤供給通路９の途中（即ち、排気通路３との接続部と添加弁８との間）の所定の位置には、逆止弁１４が設けられている。逆止弁１４は、添加弁側から排気通路側へ向かう方向とは逆方向のガスの流れを妨げる弁である。尚、還元剤供給通路９における逆止弁１４の設置位置については後述する。 A check valve 14 is provided at a predetermined position in the middle of the reducing agent supply passage 9 (that is, between the connection portion with the exhaust passage 3 and the addition valve 8). The check valve 14 is a valve that prevents the gas flow in the direction opposite to the direction from the addition valve side to the exhaust passage side. The installation position of the check valve 14 in the reducing agent supply passage 9 will be described later.
　本実施例では、ＮＯｘ触媒７に還元剤たるアンモニアを供給すべきときに、添加弁８から還元剤供給通路９内に気体のアンモニアが噴射される。噴射されたアンモニアは、還元剤供給通路９を通り、逆止弁１４を通過して、排気通路３を流れる排気中に添加される。 In this embodiment, gaseous ammonia is injected from the addition valve 8 into the reducing agent supply passage 9 when ammonia as the reducing agent is to be supplied to the NOx catalyst 7. The injected ammonia passes through the reducing agent supply passage 9, passes through the check valve 14, and is added to the exhaust gas flowing through the exhaust passage 3.
　内燃機関１には、該内燃機関１を制御するための電子制御ユニット（ＥＣＵ）１０が併設されている。ＥＣＵ１０には、エアフローメータ４、圧力センサ１２、及びＮＯｘセンサ１３が電気的に接続されている。さらに、ＥＣＵ１０には、内燃機関１のクランクポジションセンサ１１が電気的に接続されている。そして、各センサの出力信号がＥＣＵ１０に入力される。ＥＣＵ１０は、クランクポジションセンサ１１の出力値に基づいて内燃機関１の機関回転速度を導出する。 The internal combustion engine 1 is provided with an electronic control unit (ECU) 10 for controlling the internal combustion engine 1. An air flow meter 4, a pressure sensor 12, and a NOx sensor 13 are electrically connected to the ECU 10. Further, a crank position sensor 11 of the internal combustion engine 1 is electrically connected to the ECU 10. And the output signal of each sensor is input into ECU10. The ECU 10 derives the engine speed of the internal combustion engine 1 based on the output value of the crank position sensor 11.
　さらに、ＥＣＵ１０には、スロットル弁５、添加弁８、及び調圧弁２２が電気的に接続されている。ＥＣＵ１０によって、これらの装置の動作が制御される。 Furthermore, the throttle valve 5, the addition valve 8, and the pressure regulating valve 22 are electrically connected to the ECU 10. The operation of these devices is controlled by the ECU 10.
　排気が添加弁８内に侵入すると、添加弁８内に残留しているアンモニアと排気に含まれる成分との化合物（例えば、（ＮＨ４）２ＳＯ４、ＮＨ４ＮＯ３，（ＮＨ４）２ＣＯ３）が生成される場合がある。添加弁８内において、このような化合物が生成されると、添加弁８内におけるアンモニアの流路が該化合物によって閉塞される虞がある。 When the exhaust enters the addition valve 8, a compound (for example, (NH 4 ) 2 SO 4 , NH 4 NO 3 , (NH 4 ) 2 ) of ammonia remaining in the addition valve 8 and components contained in the exhaust. CO 3 ) may be generated. If such a compound is generated in the addition valve 8, the ammonia flow path in the addition valve 8 may be blocked by the compound.
　添加弁８内におけるアンモニアの流路が該化合物によって閉塞されると、排気中へのアンモニアの添加量を目標値に制御することが困難となる。その結果、ＮＯｘ触媒７におけるＮＯｘの還元が不十分となり、排気特性の悪化を招く虞がある。 If the ammonia flow path in the addition valve 8 is blocked by the compound, it becomes difficult to control the amount of ammonia added to the exhaust gas to the target value. As a result, the reduction of NOx in the NOx catalyst 7 becomes insufficient, and the exhaust characteristics may be deteriorated.
　そのため、本実施例においては、還元剤供給通路９の途中の所定の位置に、逆止弁１４が設けられている。これにより、還元剤供給通路９を逆流して排気が添加弁８に到達することを抑制することができる。その結果、添加弁８内に排気が侵入することを抑制することができる。そのため、添加弁８内において、排気に含まれる成分とアンモニアとの化合物が生成されることを抑制することができる。 Therefore, in this embodiment, a check valve 14 is provided at a predetermined position in the middle of the reducing agent supply passage 9. Thereby, it is possible to suppress the exhaust from reaching the addition valve 8 by flowing backward through the reducing agent supply passage 9. As a result, it is possible to suppress the exhaust from entering the addition valve 8. Therefore, in the addition valve 8, it can suppress that the compound of the component contained in exhaust_gas | exhaustion and ammonia is produced | generated.
　従って、本実施例によれば、排気に含まれる成分とアンモニアとの化合物によって、添加弁８内におけるアンモニアの流路が閉塞されることを抑制することができる。 Therefore, according to the present embodiment, it is possible to prevent the ammonia flow path in the addition valve 8 from being blocked by the compound of the component contained in the exhaust gas and ammonia.
　また、本実施例によれば、逆止弁１４によって、排気中の粒子状物質（ＰＭ）が添加弁８に到達することも抑制することできる。そのため、添加弁８にＰＭが堆積することも抑制することができる。 Further, according to this embodiment, the check valve 14 can also suppress the particulate matter (PM) in the exhaust from reaching the addition valve 8. Therefore, it is possible to suppress PM from accumulating on the addition valve 8.
　また、逆止弁１４によって、排気の脈動が還元剤供給通路９内を伝わって添加弁８まで伝播することも抑制することができる。そのため、添加弁８からアンモニアを噴射する際に、排気の脈動の影響を受けにくくなる。従って、排気中へのアンモニアの添加量を高精度で制御することが可能となる。 Also, the check valve 14 can suppress the pulsation of the exhaust gas from being transmitted through the reducing agent supply passage 9 to the addition valve 8. Therefore, when ammonia is injected from the addition valve 8, it is less likely to be affected by exhaust pulsation. Accordingly, it is possible to control the amount of ammonia added to the exhaust gas with high accuracy.
　ここで、還元剤供給通路９における逆止弁１４の設置位置について説明する。逆止弁１４の周囲に気体のアンモニアが滞留していると、該逆止弁１４の周囲においても、排気に含まれる成分とアンモニアとの化合物が生成される場合がある。ここで生成された化合物が逆止弁１４に付着すると、該逆止弁１４の動作に不具合が生じる虞がある。 Here, the installation position of the check valve 14 in the reducing agent supply passage 9 will be described. If gaseous ammonia stays around the check valve 14, a compound of the component contained in the exhaust gas and ammonia may also be generated around the check valve 14. When the compound produced | generated here adheres to the non-return valve 14, a malfunction may arise in operation | movement of this non-return valve 14. FIG.
　そのため、本実施例では、逆止弁１４が、還元剤供給通路９において、排気に含まれる成分とアンモニアとの化合物の融点以上の温度まで、該逆止弁１４の温度が排気からの受熱により上昇することが可能な位置に設けられている。 For this reason, in this embodiment, the check valve 14 has a temperature not lower than the melting point of the compound of ammonia and the component contained in the exhaust gas in the reducing agent supply passage 9, and the temperature of the check valve 14 is received by heat from the exhaust gas. It is provided at a position where it can rise.
　逆止弁１４の設置位置が排気通路３との接続部に近いほど、該逆止弁１４は排気からの受熱によってより高い温度まで昇温する。また、例えば、（ＮＨ４）２ＳＯ４の融点は２３５℃であり、ＮＨ４ＮＯ３の融点は１７０℃であり、（ＮＨ４）２ＣＯ３の５８℃である。そこで、排気からの受熱により逆止弁１４の温度が２３５℃以上に上昇することが可能な位置に逆止弁１４を設置してもよい。 The closer the installation position of the check valve 14 is to the connection portion with the exhaust passage 3, the temperature of the check valve 14 is raised to a higher temperature by receiving heat from the exhaust. For example, (NH 4 ) 2 SO 4 has a melting point of 235 ° C., NH 4 NO 3 has a melting point of 170 ° C., and (NH 4 ) 2 CO 3 has a melting point of 58 ° C. Therefore, the check valve 14 may be installed at a position where the temperature of the check valve 14 can be raised to 235 ° C. or higher by receiving heat from the exhaust.
　還元剤供給通路９における逆止弁１４の設置位置を上記のような位置とすることで、排気に含まれる成分とアンモニアとの化合物が逆止弁１４に付着したとしても、該化合物を除去することができる。そのため、該化合物の付着に起因する逆止弁１４の不具合の発生を抑制することができる。 By setting the check valve 14 in the reducing agent supply passage 9 to the position as described above, even if a compound of ammonia and components contained in the exhaust adheres to the check valve 14, the compound is removed. be able to. Therefore, it is possible to suppress the occurrence of the malfunction of the check valve 14 due to the adhesion of the compound.
　尚、本実施例においては、逆止弁１４の断熱性を高くすることで、排気の熱が添加弁８に伝わるのをより抑制することができる。そのため、添加弁８の熱劣化を抑制することができる。また、添加弁８を、排気の熱が伝わり難い位置に設置することによっても、添加弁８の熱劣化を抑制することができる。 In this embodiment, it is possible to further suppress the heat of the exhaust from being transmitted to the addition valve 8 by increasing the heat insulation of the check valve 14. Therefore, thermal deterioration of the addition valve 8 can be suppressed. Moreover, thermal deterioration of the addition valve 8 can also be suppressed by installing the addition valve 8 at a position where the heat of the exhaust gas is difficult to be transmitted.
　また、本実施例に係る構成は、アンモニア以外の気体を還元剤として用いる場合にも適用することができる。 The configuration according to the present embodiment can also be applied when a gas other than ammonia is used as the reducing agent.
　＜実施例２＞
　図２は、本実施例に係る内燃機関の吸排気系の概略構成を示す図である。以下、実施例１とは異なる点についてのみ説明する。 <Example 2>
FIG. 2 is a diagram showing a schematic configuration of an intake / exhaust system of the internal combustion engine according to the present embodiment. Only differences from the first embodiment will be described below.
　本実施例においても、還元剤供給通路９における、排気通路３との接続部と添加弁８との間には、逆止弁１４が設けられている。そして、逆止弁１４に、該逆止弁１４を加熱するための電気ヒータ１５が設けられている。電気ヒータ１５は、排気に含まれる成分とアンモニアとの化合物の融点以上の温度まで逆止弁１４を昇温させることができる。電気ヒータ１５は、ＥＣＵ１０に電気的に接続されており、ＥＣＵ１０によってその動作が制御される。 Also in this embodiment, a check valve 14 is provided between the connecting portion of the reducing agent supply passage 9 and the exhaust passage 3 and the addition valve 8. The check valve 14 is provided with an electric heater 15 for heating the check valve 14. The electric heater 15 can raise the temperature of the check valve 14 to a temperature equal to or higher than the melting point of the compound of ammonia and the component contained in the exhaust gas. The electric heater 15 is electrically connected to the ECU 10 and its operation is controlled by the ECU 10.
　本実施例によれば、排気に含まれる成分とアンモニアとの化合物が逆止弁１４に付着したとしても、電気ヒータ１５によって逆止弁１４を加熱することで、該化合物を除去することができる。従って、実施例１と同様の効果を得ることができる。 According to this embodiment, even if a compound of ammonia and a component contained in exhaust gas adheres to the check valve 14, the compound can be removed by heating the check valve 14 with the electric heater 15. . Therefore, the same effect as in the first embodiment can be obtained.
　また、本実施例によれば、還元剤供給通路９における、排気通路３との接続部と添加弁８との間であれば、逆止弁１４を任意の位置に設けることが可能となる。 Further, according to the present embodiment, the check valve 14 can be provided at an arbitrary position as long as it is between the connecting portion of the reducing agent supply passage 9 and the exhaust passage 3 and the addition valve 8.
１・・・内燃機関
２・・・吸気通路
３・・・排気通路
７・・・選択還元型ＮＯｘ触媒
８・・・添加弁
９・・・還元剤供給通路
１０・・ＥＣＵ
１４・・逆止弁
１５・・電気ヒータ
２０・・タンク
２１・・アンモニア通路
２２・・調圧弁 DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine 2 ... Intake passage 3 ... Exhaust passage 7 ... Selective reduction type NOx catalyst 8 ... Addition valve 9 ... Reductant supply passage 10 ... ECU
14. Check valve 15 Electric heater 20 Tank 21 Ammonia passage 22 Pressure regulating valve

Claims (2)

  1. 　内燃機関の排気通路に設けられた選択還元型ＮＯｘ触媒と、
    　前記選択還元型ＮＯｘ触媒よりも上流側の排気通路に接続された還元剤供給通路と、
    　前記還元剤供給通路に設けられ、該還元剤供給通路に気体の還元剤を供給することで、排気通路を流れる排気中に該還元剤を添加する添加装置と、
    　前記還元剤供給通路における、排気通路との接続部と前記添加装置との間の所定位置に設けられ、前記添加装置側から排気通路側へ向かう方向とは逆方向のガスの流れを妨げる逆止弁と、を備え、
    　前記所定位置が、前記逆止弁に付着した、排気に含まれる成分と還元剤との化合物が除去される温度まで、前記逆止弁の温度が排気からの受熱により上昇することが可能な位置である内燃機関の排気浄化装置。     A selective reduction NOx catalyst provided in an exhaust passage of the internal combustion engine;
    A reducing agent supply passage connected to an exhaust passage upstream of the selective reduction type NOx catalyst;
    An addition device that is provided in the reducing agent supply passage and adds the reducing agent to the exhaust gas flowing through the exhaust passage by supplying a gaseous reducing agent to the reducing agent supply passage;
    A check that is provided at a predetermined position between the connecting portion of the reducing agent supply passage and the exhaust passage and the addition device, and prevents a gas flow in a direction opposite to the direction from the addition device to the exhaust passage. A valve, and
    Position at which the temperature of the check valve can be increased by receiving heat from the exhaust gas until the predetermined position is adhered to the check valve and the compound of the component contained in the exhaust gas and the reducing agent is removed. An exhaust purification device for an internal combustion engine.
  2. 　内燃機関の排気通路に設けられた選択還元型ＮＯｘ触媒と、
    　前記選択還元型ＮＯｘ触媒よりも上流側の排気通路に接続された還元剤供給通路と、
    　前記還元剤供給通路に設けられ、該還元剤供給通路に気体の還元剤を供給することで、排気通路を流れる排気中に該還元剤を添加する添加装置と、
    　前記還元剤供給通路における、排気通路との接続部と前記添加装置との間に設けられ、前記添加装置側から排気通路側へ向かう方向とは逆方向のガスの流れを妨げる逆止弁と、
    　前記逆止弁に付着した、排気に含まれる成分と還元剤との化合物が除去される温度まで、前記逆止弁の温度を上昇させることが可能な昇温装置と、と備えた内燃機関の排気浄化装置。     A selective reduction NOx catalyst provided in an exhaust passage of the internal combustion engine;
    A reducing agent supply passage connected to an exhaust passage upstream of the selective reduction NOx catalyst;
    An addition device that is provided in the reducing agent supply passage and adds the reducing agent to the exhaust gas flowing through the exhaust passage by supplying a gaseous reducing agent to the reducing agent supply passage;
    A check valve that is provided between the connecting portion of the reducing agent supply passage with the exhaust passage and the addition device, and prevents a gas flow in a direction opposite to the direction from the addition device side toward the exhaust passage;
    A temperature raising device capable of raising the temperature of the check valve to a temperature at which a compound of a component and a reducing agent contained in exhaust gas attached to the check valve is removed, and an internal combustion engine comprising: Exhaust purification device.
PCT/JP2011/076167 2011-11-14 2011-11-14 Exhaust gas purification device for internal combustion engine WO2013072982A1 (en)

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JP2011106412A (en) * 2009-11-20 2011-06-02 Denso Corp Exhaust emission control device for internal combustion engine

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JP2005127318A (en) * 2003-09-19 2005-05-19 Nissan Diesel Motor Co Ltd Engine exhaust emission control device
JP2008546968A (en) * 2005-06-29 2008-12-25 アムミネクス・アー／エス Method and apparatus for the safe and controlled delivery of ammonia from a solid ammonia storage medium
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Publication number Priority date Publication date Assignee Title
FR3087836A1 (en) * 2018-10-26 2020-05-01 Faurecia Systemes D'echappement INJECTOR FOR INJECTING A GASEOUS REDUCING AGENT INTO AN EXHAUST GAS STREAM, COMPRISING AT LEAST ONE ANTI-REFLUX DEVICE
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