WO2021193735A1 - Mélangeur - Google Patents

Mélangeur Download PDF

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Publication number
WO2021193735A1
WO2021193735A1 PCT/JP2021/012289 JP2021012289W WO2021193735A1 WO 2021193735 A1 WO2021193735 A1 WO 2021193735A1 JP 2021012289 W JP2021012289 W JP 2021012289W WO 2021193735 A1 WO2021193735 A1 WO 2021193735A1
Authority
WO
WIPO (PCT)
Prior art keywords
mixer
reducing agent
blades
exhaust gas
fin members
Prior art date
Application number
PCT/JP2021/012289
Other languages
English (en)
Japanese (ja)
Inventor
達也 上川
建都 金田
悠治 葛西
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 CN202180023457.2A priority Critical patent/CN115315572B/zh
Publication of WO2021193735A1 publication Critical patent/WO2021193735A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • 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
    • 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

  • the present disclosure relates to a mixer that agitates exhaust gas and a reducing agent.
  • a urea SCR (Selective Catalytic Reduction) system is known as a system for purifying exhaust gas discharged from an internal combustion engine. Further, in this system, it is known that a mixer is provided between an injector for injecting urea water and an SCR catalyst in order to promote mixing and diffusion of exhaust gas and urea water (see, for example, Patent Document 1). ..
  • the conventional mixer has room for improvement in terms of stirring performance.
  • An object of one aspect of the present disclosure is to provide a mixer capable of further improving the stirring performance.
  • the mixer according to one aspect of the present disclosure is provided between the reducing agent supply device that supplies the reducing agent into the exhaust pipe and the NOx purification catalyst in the exhaust pipe through which the exhaust gas discharged from the internal combustion engine flows, and swirls the exhaust gas.
  • the blades are arranged so as to be densely packed.
  • the stirring performance can be further improved.
  • 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 perspective view of the mixer according to the embodiment of the present disclosure.
  • FIG. 3 is a front view of the mixer according to the embodiment of the present disclosure.
  • FIG. 1 is a schematic view showing an example of the configuration of the exhaust structure of the present embodiment.
  • the exhaust structure shown in FIG. 1 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 pipe 1 is a cylindrical pipe through which the exhaust gas discharged from the internal combustion engine flows. Although not shown, the upstream end of the exhaust pipe 1 is connected to an exhaust manifold provided in the internal combustion engine.
  • the arrow a shown in FIG. 1 indicates the flow direction of the exhaust gas in the exhaust pipe 1 (which may be referred to as the axial direction of the exhaust pipe 1).
  • the exhaust pipe 1 is provided with a urea water injection device 2, a mixer 3, and an SCR (Selective Catalytic Reduction) catalyst 4 in this order from the upstream side.
  • a urea water injection device 2 a mixer 3
  • an SCR (Selective Catalytic Reduction) catalyst 4 in this order from the upstream side.
  • 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 2 (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 2 is also called, for example, a dosing module or an injector.
  • the urea water injection device 2 has a plurality of injection ports independent of each other. Urea water is injected from these injection ports.
  • the urea water injected by the urea water injection device 2 is hydrolyzed on the downstream side of the mixer 3, for example.
  • Ammonia generated thereby (an example of a substance generated from the reducing agent) is supplied to the SCR catalyst 4.
  • the injection amount and injection timing of urea water are controlled by a control device (not shown).
  • the mixer 3 is a device that stirs and mixes urea water and exhaust gas.
  • the exhaust gas that has passed through the mixer 3 becomes a swirling flow that entrains urea water.
  • the urea water contained in this swirling flow vaporizes before reaching the SCR catalyst 4 to become ammonia.
  • SCR catalyst 4 (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 4 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 exhaust pipe 1.
  • 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 4. This makes it possible to prevent ammonia from being discharged into the atmosphere.
  • FIG. 2 is a perspective view of the mixer 3.
  • FIG. 3 is a front view of the mixer 3. Both FIGS. 2 and 3 show a state in which the mixer 3 is viewed from the upstream side in the flow direction of the exhaust gas.
  • the mixer 3 has fin members 3a, 3b, and 3c in this order from the upstream side in the flow direction of the exhaust gas.
  • the fin members 3a, 3b, and 3c are separate from each other and are arranged at predetermined intervals in the flow direction of the exhaust gas.
  • the fin members 3a to 3c have the same shape and the same size.
  • Each of the fin members 3a to 3c has three blade portions (reference numerals omitted) extending radially from the central portion.
  • the three blades are integrally formed. Further, the three blades are fixed (for example, welded) to the inner peripheral surface of the exhaust pipe 1.
  • the number of blades provided for each fin member is the same as the number of injection ports of the urea water injection device 2. Further, the total number of blades provided on all fin members is larger than the number of injection ports of the urea water injection device 2. In the present embodiment, assuming that the number of injection ports of the urea water injection device 2 is three, three blades are provided on one fin member, and the total number of blades provided on the three fin members is nine. The case of one is given as an example.
  • the fin members 3a to 3c are provided so as to be offset in the circumferential direction of the exhaust pipe 1 so that a region A in which the blades are dense (hereinafter referred to as a blade dense region A) is formed.
  • a blade dense region A a region A in which the blades are dense
  • the distance between the blades in the blade dense region A is such that the blade at the end of one blade dense region A and another blade adjacent to the blade. It is closer than the distance from the blade portion at the end of the densely packed region A.
  • the number of blade dense regions A is the same as the number of injection ports of the urea water injection device 2.
  • FIG. 3 shows a case where the number of injection ports of the urea water injection device 2 is three and three blade dense regions A are formed as an example.
  • the blade dense region A is formed corresponding to the position of the injection port of the urea water injection device 2 (more specifically, the region where the urea water injected from the injection port can directly hit).
  • the mixer 3 has a plurality of fin members 3a to 3c provided with the same number of blades as the number of injection ports of the urea water injection device 2, and the plurality of fin members 3a to 3c. Is characterized in that the blade portions of each of the plurality of fin members 3a to 3c are arranged so as to be densely arranged in the region A where the reducing agent injected from the injection port can directly hit.
  • the stirring performance of the exhaust gas and the urea water can be further improved.
  • the stirring performance is low, a white product due to urea water may be deposited in the exhaust pipe 1, but in the present embodiment, this can be prevented.
  • the mixer 3 is characterized by being composed of fin members 3a to 3c having the same shape and the same size.
  • the degree of density of the blades in the blade density area A can be easily adjusted. Further, the number of fin members can be easily increased or decreased according to the number of injection ports. Further, the manufacturing cost can be reduced as compared with the case where a plurality of fin members are integrally formed.
  • the SCR catalyst 4 has been described as an example of the NOx purification catalyst, but the present invention is not limited to this. Instead of the SCR catalyst 4, another selective reduction catalyst, a NOx adsorption catalyst, or a three-way catalyst may be used. In that case, a reducing agent other than urea water (for example, a hydrocarbon or the like) may be used.
  • the mixer of the present disclosure is useful for a mixer that mixes a gas (for example, exhaust gas) and a liquid (for example, a reducing agent).
  • a gas for example, exhaust gas
  • a liquid for example, a reducing agent

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

L'invention concerne un mélangeur qui améliore en outre les performances de mélange. Ce mélangeur est disposé à l'intérieur d'un tuyau d'échappement à travers lequel le gaz d'échappement émis par un moteur à combustion interne est évacué, entre un dispositif d'alimentation en agent réducteur, qui fournit un agent réducteur à l'intérieur du tuyau d'échappement, et un catalyseur d'épuration de NOx. Le mélangeur génère un flux tourbillonnant qui mélange le gaz d'échappement et l'agent réducteur. Le mélangeur est pourvu d'un grand nombre de lames que le nombre d'orifices d'injection du dispositif d'alimentation en agent réducteur, et est positionné de telle sorte que les lames sont concentrées dans une région correspondant à la position des orifices d'injection.
PCT/JP2021/012289 2020-03-27 2021-03-24 Mélangeur WO2021193735A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202180023457.2A CN115315572B (zh) 2020-03-27 2021-03-24 混合器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020-057411 2020-03-27
JP2020057411A JP7310676B2 (ja) 2020-03-27 2020-03-27 ミキサー

Publications (1)

Publication Number Publication Date
WO2021193735A1 true WO2021193735A1 (fr) 2021-09-30

Family

ID=77892221

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/012289 WO2021193735A1 (fr) 2020-03-27 2021-03-24 Mélangeur

Country Status (3)

Country Link
JP (1) JP7310676B2 (fr)
CN (1) CN115315572B (fr)
WO (1) WO2021193735A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015031156A (ja) * 2013-07-31 2015-02-16 カルソニックカンセイ株式会社 排気浄化装置
DE102015217357A1 (de) * 2015-09-10 2017-03-16 Volkswagen Aktiengesellschaft Mischvorrichtung und Mischersystem für eine Abgasanlage eines Verbrennungsmotors
JP2017214884A (ja) * 2016-06-01 2017-12-07 いすゞ自動車株式会社 排気浄化システム
JP2019143532A (ja) * 2018-02-20 2019-08-29 いすゞ自動車株式会社 還元剤噴射装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101900018A (zh) * 2010-07-06 2010-12-01 清华大学 一种尿素混合装置
CN109414662B (zh) * 2016-07-07 2021-09-17 卡特彼勒公司 用于废气后处理系统的双混合器
US10138789B1 (en) * 2017-07-18 2018-11-27 GM Global Technology Operations LLC Exhaust gas treatment systems utilizing a plurality of reduced-resistance mixers

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015031156A (ja) * 2013-07-31 2015-02-16 カルソニックカンセイ株式会社 排気浄化装置
DE102015217357A1 (de) * 2015-09-10 2017-03-16 Volkswagen Aktiengesellschaft Mischvorrichtung und Mischersystem für eine Abgasanlage eines Verbrennungsmotors
JP2017214884A (ja) * 2016-06-01 2017-12-07 いすゞ自動車株式会社 排気浄化システム
JP2019143532A (ja) * 2018-02-20 2019-08-29 いすゞ自動車株式会社 還元剤噴射装置

Also Published As

Publication number Publication date
CN115315572A (zh) 2022-11-08
JP2021156217A (ja) 2021-10-07
CN115315572B (zh) 2024-04-02
JP7310676B2 (ja) 2023-07-19

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