WO2021182495A1 - 排気構造 - Google Patents

排気構造 Download PDF

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Publication number
WO2021182495A1
WO2021182495A1 PCT/JP2021/009443 JP2021009443W WO2021182495A1 WO 2021182495 A1 WO2021182495 A1 WO 2021182495A1 JP 2021009443 W JP2021009443 W JP 2021009443W WO 2021182495 A1 WO2021182495 A1 WO 2021182495A1
Authority
WO
WIPO (PCT)
Prior art keywords
exhaust pipe
upstream
downstream
exhaust
side exhaust
Prior art date
Application number
PCT/JP2021/009443
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
達也 上川
智洋 藤原
建都 金田
悠治 葛西
憲仁 岩田
研二 加藤
翔 長谷川
亮二 甲斐
信隆 綾部
健 宮脇
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
Priority to CN202180018621.0A priority Critical patent/CN115210456A/zh
Publication of WO2021182495A1 publication Critical patent/WO2021182495A1/ja

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Classifications

    • 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
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • 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

  • This disclosure relates to the exhaust structure.
  • a urea SCR (Selective Catalytic Reduction) system is known as a system for purifying exhaust gas discharged from an internal combustion engine (see, for example, Patent Document 1). Further, in the urea SCR system, it is known that an upstream exhaust pipe provided with an injector for injecting urea water and a downstream exhaust pipe provided with an SCR catalyst are connected to each other.
  • An object of one aspect of the present disclosure is to provide an exhaust structure capable of suppressing the occurrence of corrosion.
  • the exhaust structure according to one aspect of the present disclosure is an exhaust structure in which an upstream exhaust pipe through which exhaust gas discharged from an internal combustion engine flows and a downstream exhaust pipe are connected in series, and is a downstream end of the upstream exhaust pipe. Is smaller than the inner diameter of the upstream end of the downstream exhaust pipe, the downstream end of the upstream exhaust pipe is inserted inside the upstream end of the downstream exhaust pipe, and the downstream end of the upstream exhaust pipe is inserted.
  • the outer peripheral surface of the exhaust pipe and the inner peripheral surface of the upstream end of the downstream exhaust pipe are fixed in contact with each other.
  • the occurrence of corrosion can be suppressed.
  • FIG. 1 is a schematic view showing an example of the configuration of the exhaust structure according to the embodiment of the present disclosure.
  • FIG. 2 is a schematic view showing an example of the configuration of the exhaust structure according to the comparative example of the embodiment of the present disclosure.
  • FIG. 1 is a schematic view showing an example of the configuration of the exhaust structure 100.
  • the exhaust structure 100 is mounted on, for example, a vehicle equipped with an internal combustion engine (for example, a commercial vehicle such as a bus or a truck).
  • the internal combustion engine may be a diesel engine or a gasoline engine.
  • the exhaust structure 100 includes an upstream exhaust pipe 1, a downstream exhaust pipe 2, a urea water injection device 3, a mixer 4, and an SCR (Selective Catalytic Reduction) catalyst 5.
  • the upstream exhaust pipe 1 and the downstream exhaust pipe 2 are tubular pipes through which the exhaust gas discharged from the internal combustion engine flows.
  • the upstream exhaust pipe 1 and the downstream exhaust pipe 2 are connected in series.
  • the arrow A shown in FIG. 1 indicates the flow direction of the exhaust gas in the upstream exhaust pipe 1 and the downstream exhaust pipe 2.
  • the upstream end of the upstream exhaust pipe 1 is connected to an exhaust manifold provided in the internal combustion engine. Further, although not shown, the downstream end of the downstream exhaust pipe 2 may face the atmosphere or may be connected to an exhaust diffuser or the like.
  • the inner diameter a at the downstream end of the upstream exhaust pipe 1 is shorter (smaller) than the inner diameter b at the upstream end of the downstream exhaust pipe 2.
  • the downstream end of the upstream exhaust pipe 1 is inserted inside the upstream end of the downstream exhaust pipe 2. Further, the outer peripheral surface of the downstream end of the upstream exhaust pipe 1 and the inner peripheral surface of the upstream end of the downstream exhaust pipe 2 are fixed (for example, welded) in contact with each other.
  • SUS Steel Use Stainless
  • SUS444 As the material of the upstream exhaust pipe 1, for example, SUS436, SUS444, or SUS447 can be used.
  • the downstream exhaust pipe 2 is superior in corrosion resistance to the upstream exhaust pipe 1. It can be configured as follows.
  • the upstream exhaust pipe 1 is provided with a urea water injection device 3.
  • a mixer 4 and an SCR catalyst 5 are provided in the downstream exhaust pipe 2.
  • the size, shape, positional relationship, and the like of each component shown in FIG. 1 are merely examples, and are not limited to those shown in FIG.
  • the urea water injection device 3 (an example of a reducing agent supply device) is a device that injects urea water (an example of a reducing agent) into the exhaust pipe 1.
  • the urea water injection device 3 is also called, for example, a dosing module or an injector.
  • the urea water injected by the urea water injection device 3 is hydrolyzed on the downstream side of the mixer 4, for example.
  • Ammonia generated thereby (an example of a substance generated from the reducing agent) is supplied to the SCR catalyst 5.
  • the injection amount and injection timing of urea water are controlled by a control device (not shown).
  • the mixer 4 is a device that stirs and mixes urea water and exhaust gas.
  • the exhaust gas that has passed through the mixer 4 becomes a swirling flow that entrains urea water.
  • the urea water contained in this swirling flow vaporizes before reaching the SCR catalyst 5 to become ammonia.
  • SCR catalyst 5 (an example of NOx purification catalyst) is a catalyst that reduces NOx in exhaust gas to nitrogen by ammonia generated from urea water.
  • the SCR catalyst 5 may be housed in a catalyst converter (also referred to as a catalyst casing) which is a housing that can be attached to and detached from the downstream exhaust pipe 2.
  • a catalyst converter also referred to as a catalyst casing
  • an ASC Ammonia Slip Catalyst
  • ASC is a catalyst that oxidizes and decomposes ammonia that cannot be completely consumed by the SCR catalyst 5. This makes it possible to prevent ammonia from being discharged into the atmosphere.
  • FIG. 2 is a schematic view showing an example of the configuration of the exhaust structure 200.
  • the components common to those in FIG. 1 in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted as appropriate.
  • the inner diameter a at the downstream end of the upstream exhaust pipe 1 is longer (larger) than the inner diameter b at the upstream end of the downstream exhaust pipe 2.
  • the upstream end of the downstream exhaust pipe 2 is inserted inside the downstream end of the upstream exhaust pipe 1. Further, the inner peripheral surface of the downstream end of the upstream exhaust pipe 1 and the outer peripheral surface of the upstream end of the downstream exhaust pipe 2 are fixed (for example, welded) in contact with each other.
  • the exhaust structure 100 of the present embodiment is characterized in that the inner diameter a of the downstream end of the upstream exhaust pipe 1 is smaller than the inner diameter b of the upstream end of the downstream exhaust pipe 2. Therefore, in the exhaust structure 100 of the present embodiment, the step as shown in FIG. 2 does not occur at the connecting portion between the upstream exhaust pipe 1 and the downstream exhaust pipe 2. Therefore, the occurrence of corrosion can be suppressed.
  • the exhaust structure 100 of the present embodiment is characterized in that the material constituting the downstream exhaust pipe 2 has higher corrosion resistance than the material constituting the upstream exhaust pipe 1. Therefore, the occurrence of corrosion is more effective at the connection portion between the upstream exhaust pipe 1 and the downstream exhaust pipe 2 where urea water may accumulate on the downstream side of the urea water injection device 3 and on the upstream side of the SCR catalyst 5. It can be suppressed.
  • the exhaust structure of the present disclosure is useful for a structure in which a plurality of exhaust pipes are connected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Silencers (AREA)
PCT/JP2021/009443 2020-03-10 2021-03-10 排気構造 WO2021182495A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202180018621.0A CN115210456A (zh) 2020-03-10 2021-03-10 排气构造

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020041004A JP7314840B2 (ja) 2020-03-10 2020-03-10 排気構造
JP2020-041004 2020-03-10

Publications (1)

Publication Number Publication Date
WO2021182495A1 true WO2021182495A1 (ja) 2021-09-16

Family

ID=77672395

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/009443 WO2021182495A1 (ja) 2020-03-10 2021-03-10 排気構造

Country Status (3)

Country Link
JP (1) JP7314840B2 (zh)
CN (1) CN115210456A (zh)
WO (1) WO2021182495A1 (zh)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009264290A (ja) * 2008-04-25 2009-11-12 Bosch Corp 内燃機関の排気浄化装置
JP2012092769A (ja) * 2010-10-28 2012-05-17 Mitsubishi Fuso Truck & Bus Corp 排気浄化装置の接続部構造
JP2018021514A (ja) * 2016-08-03 2018-02-08 いすゞ自動車株式会社 ミキサユニットおよび排気系
JP2018053751A (ja) * 2016-09-27 2018-04-05 いすゞ自動車株式会社 排気内噴射装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007048560A1 (de) * 2007-10-09 2009-04-23 Audi Ag Vorrichtung zum Nachbehandeln von Abgasen einer magerlauffähigen Brennkraftmaschine
WO2012127621A1 (ja) * 2011-03-22 2012-09-27 トヨタ自動車株式会社 内燃機関の排気浄化装置
JP6114244B2 (ja) * 2014-09-12 2017-04-12 本田技研工業株式会社 車両の排気装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009264290A (ja) * 2008-04-25 2009-11-12 Bosch Corp 内燃機関の排気浄化装置
JP2012092769A (ja) * 2010-10-28 2012-05-17 Mitsubishi Fuso Truck & Bus Corp 排気浄化装置の接続部構造
JP2018021514A (ja) * 2016-08-03 2018-02-08 いすゞ自動車株式会社 ミキサユニットおよび排気系
JP2018053751A (ja) * 2016-09-27 2018-04-05 いすゞ自動車株式会社 排気内噴射装置

Also Published As

Publication number Publication date
JP7314840B2 (ja) 2023-07-26
JP2021143601A (ja) 2021-09-24
CN115210456A (zh) 2022-10-18

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