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CN101784772B - 内燃机的排气净化装置 - Google Patents

内燃机的排气净化装置 Download PDF

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CN101784772B
CN101784772B CN2008801044067A CN200880104406A CN101784772B CN 101784772 B CN101784772 B CN 101784772B CN 2008801044067 A CN2008801044067 A CN 2008801044067A CN 200880104406 A CN200880104406 A CN 200880104406A CN 101784772 B CN101784772 B CN 101784772B
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reducing agent
exhaust
valve
combustion engine
adds
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CN101784772A (zh
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美才治悠树
福田光一朗
井上三树男
新田悟
长江清彦
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30Injector mixers
    • B01F25/31Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
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    • F01N3/18Exhaust 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
    • F01N3/20Exhaust 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
    • F01N3/2066Selective catalytic reduction [SCR]
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20Mixing gases with liquids
    • B01F23/21Mixing gases with liquids by introducing liquids into gaseous media
    • B01F23/213Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
    • B01F23/2132Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/25Mixing by jets impinging against collision plates
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/02Adding substances to exhaust gases the substance being ammonia or urea
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/03Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00Adding substances to exhaust gases
    • F01N2610/10Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/102Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance after addition to exhaust gases, e.g. by a passively or actively heated surface in the exhaust conduit
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • F01N3/0253Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust adding fuel to exhaust gases
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/0807Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract

本发明提供一种内燃机的排气净化装置,在使还原剂扩散的同时减小排气的阻力。其具备:喷射还原剂的还原剂添加阀(5);还原剂添加阀安装部(4),其在流动于内燃机(1)的排气通路(2)中的排气的气流的外侧具有用于还原剂添加阀(5)喷射还原剂的空间,并且设有还原剂添加阀(5);和碰撞部(41),其存在于还原剂添加阀安装部(4)中,从还原剂添加阀(5)喷射的还原剂与其碰撞,其中,使来自还原剂添加阀(5)的还原剂的喷射方向朝向碰撞部(41),并且朝向比该还原剂添加阀(5)靠下游的排气的下游侧。

Description

内燃机的排气净化装置
技术领域
本发明涉及一种内燃机的排气净化装置。
背景技术
已知有如下的技术,即,通过向内燃机的排气通路中所设的催化剂中添加还原剂,而净化NOx、提高催化剂的温度或进行过滤器的再生。此外,还已知有如下的技术,即,在与还原剂添加阀的喷孔最近的距离,设置用于使还原剂碰撞的碰撞壁(例如参照专利文献1。)。根据该技术,由于在还原剂被排气的气流冲向下游之前就与碰撞壁碰撞,因此该还原剂的微粒化得到促进。另外,由于喷孔并未直接暴露于排气的气流中,因此可以抑制该喷孔的堵塞。
专利文献1:日本特开2002-89255号公报
专利文献2:日本特开2006-9608号公报
专利文献3:日本特开2007-32472号公报
专利文献4:日本特表2004-532954号公报
但是,如果碰撞壁处于排气的气流之中,则由于排气的阻力变大,因此压力损耗增加。这样,就有可能导致内燃机的功能降低。
发明内容
本发明是鉴于如上所述的问题而完成的,其目的在于,提供一种可以在内燃机的排气净化装置中在使还原剂扩散的同时减小排气的阻力的技术。
为了实现上述目的,本发明的内燃机的排气净化装置采用了以下的单元。即,本发明的内燃机的排气净化装置具备:
喷射还原剂的还原剂添加阀;
还原剂添加阀安装部,其在流动于内燃机的排气通路中的排气的气流的外侧具有用于上述还原剂添加阀喷射还原剂的空间,并且设置有上述还原剂添加阀;和
碰撞部,其存在于上述还原剂添加阀安装部中,从上述还原剂添加阀喷射的还原剂与其碰撞,
其中,使来自上述还原剂添加阀的还原剂的喷射方向朝向上述碰撞部并且朝向比该还原剂添加阀靠下游的排气的下游侧。
即,通过在排气的气流的外侧具备还原剂添加阀安装部,使还原剂的喷射方向朝向比还原剂添加阀靠下游的下游侧,就可以抑制还原剂添加阀的喷孔直接暴露于排气的气流中,因此可以抑制该喷孔堵塞。另外,由于在排气的气流之外具有碰撞部,因此可以抑制压力损耗的增加。此外,通过使还原剂与碰撞部碰撞,就可以促进还原剂的微粒化。而且,由于碰撞部存在于还原剂添加阀安装部内,因此可以抑制从还原剂添加阀喷射的还原剂被排气的气流带走,从而可以使更多的还原剂与碰撞部猛烈地碰撞。这样,就可以促进还原剂的微粒化。
本发明中,可以将该碰撞部设置为,从上述还原剂添加阀喷射的还原剂的全部都与上述碰撞部碰撞,被该碰撞部弹回的还原剂到达流动于排气通路中的排气的气流。
即,在使还原剂的全部与碰撞部碰撞后,使其朝向排气的气流。这样的话,就可以促进还原剂的微粒化,并且可以促进排气与还原剂的混合。
本发明中,上述碰撞部可以构成为具备具有多个孔的板,将该碰撞部设置为,通过该孔的还原剂及由该板弹回的还原剂到达流动于排气通路中的排气的气流。
也就是说,通过在碰撞部中开设孔,就可以使还原剂的一部分通过。而且,按照即使是通过碰撞部的孔,也使还原剂的微粒化得以促进的方式来调节好孔的大小或位置。另外,通过调节该通过的还原剂的比例,就可以调节排气中的还原剂浓度。而且,如果使得通过孔的还原剂及由板弹回的还原剂都到达排气的气流,就可以促进排气与还原剂的混合。
根据本发明的内燃机的排气净化装置,可以在使还原剂扩散的同时减小排气的阻力。
附图说明
图1是表示应用实施例1的内燃机的排气净化装置的内燃机及其排气系统的概略构成。
图2是表示具备实施例1的还原剂喷射室及还原剂添加阀的情况下的还原剂添加时的催化剂的温度分布的图。图2中A表示装置的概要图,图2中B表示温度分布。
图3是表示在不具备实施例1的还原剂喷射室的情况下,且从还原剂添加阀向排气中直接喷射还原剂的情况下的还原剂添加时的催化剂的温度分布的图。图3中A表示装置的概要图,图3中B表示温度分布。
图4是表示在不具备实施例1的还原剂喷射室的情况下,且在排气的气流中具备用于使还原剂碰撞的分散板的情况下的还原剂添加时的催化剂的温度分布的图。图4中A表示装置的概要图,图4中B表示温度分布。
图5是表示应用实施例2的内燃机的排气净化装置的内燃机及其排气系统的概略构成的图。
符号说明:1-内燃机,2-排气通路,3-催化剂,4-还原剂喷射室,5-还原剂添加阀,41-碰撞壁,42-碰撞板,500-分散板。
具体实施方式
下面,基于附图对本发明的内燃机的排气净化装置的具体的实施方式进行说明。
实施例1
图1是表示应用本发明的内燃机的排气净化装置的内燃机1及其排气系统的概略构成的图。图1所示的内燃机1是具有4个气缸的水冷式的4冲程柴油发动机。
排气通路2与内燃机1连接。在排气通路2的途中,具备需要还原剂的催化剂3。对于催化剂3,例如可以举出吸留还原型NOx催化剂、选择还原型NOx催化剂、氧化催化剂等。另外,也可以是担载了催化剂的颗粒过滤器、或在上游侧具有催化剂的颗粒过滤器。
另外,在催化剂3的上游的排气通路2中,安装有还原剂喷射室4。该还原剂喷射室4存在于在假定没有该还原剂喷射室4时比排气通路2靠外的外侧的位置。也就是说,还原剂喷射室4安装于离开排气的气流的位置。此外,还原剂喷射室4在排气通路2侧开口。在该还原剂喷射室4内安装有还原剂添加阀5。而且,还原剂添加阀5朝向形成于还原剂喷射室4内的碰撞壁41喷射还原剂。对于还原剂,例如可以使用燃料或尿素。而且,本实施例中,还原剂喷射室4相当于本发明的还原剂添加阀安装部。另外,本实施例中,碰撞壁41相当于本发明的碰撞部。
而且,按照从还原剂添加阀5喷射还原剂的方向为朝向排气的气流的下游侧的方式,来安装该还原剂添加阀5。对于此,只要向比与排气通路2的中心轴正交的面且包含还原剂添加阀5的喷孔的面靠下游的下游侧喷射还原剂即可,不需要与排气的气流方向平行地喷射还原剂。
另外,按照使碰撞壁41的垂直方向朝向排气的气流的上游侧的方式,形成该碰撞壁41。对于此,只要使碰撞壁41朝向比与排气通路2的中心轴正交的面且包含碰撞壁41的规定的位置的面靠上游的上游侧即可,不需要使排气的气流方向与碰撞壁41的垂直方向平行。另外,碰撞壁41也可以不是平面。
此外,按照使从还原剂添加阀5中喷射的、其后与碰撞壁41碰撞而弹回的还原剂搭乘上流过排气通路2的排气的气流的方式,来决定还原剂添加阀5的安装位置及喷射角度、以及碰撞壁41的位置及角度。此时,尽可能地缩短还原剂添加阀5与碰撞壁41的距离。此外,按照使从还原剂添加阀5喷射的还原剂的全部与碰撞壁41碰撞的方式设置还原剂添加阀5及碰撞壁41。而且,图1中的箭头表示还原剂的行进方向。
通过像这样配置还原剂喷射室4及还原剂添加阀5,在流动于排气通路2中的排气的行进方向上就不会存在还原剂喷射室4及还原剂添加阀5。也就是说,由于可以抑制排气的阻力变大的情况,因此可以抑制压力损耗的增加。
另外,由于还原剂添加阀5的喷孔朝向排气的气流的下游侧,因此可以抑制还原剂的冲势降低,从而可以抑制还原剂的贯穿力的降低。另外,由于排气不直接碰到喷孔,因此可以抑制由在该喷孔上附着沉积物造成的堵塞的发生。
此外,通过缩短还原剂添加阀5与碰撞壁41的距离,可以抑制还原剂被排气的气流带走的情况。也就是说,可以使更多的还原剂与碰撞壁41碰撞。并且,可以使还原剂的冲势仍然强烈地与碰撞壁41碰撞。根据这些,可以抑制还原剂向碰撞壁41附着的情况,另外,可以促进还原剂的微粒化。
此外,通过调节来自还原剂添加阀5的还原剂的喷射方向、碰撞壁41的角度,就可以使还原剂搭乘于排气的气流,因此可以促进还原剂与排气的混合。
而且,为了抑制压力损耗的增加,也可以将碰撞壁41的高度(即从排气通路2的外壁向外侧突出的距离)设为20到50mm之间。
这里,图2是表示具备本实施例的还原剂喷射室4及还原剂添加阀5的情况下的还原剂添加时的催化剂3的温度分布的图。图2中A表示装置的概要图,图2中B表示温度分布。图2中B是用与该催化剂3的中心轴正交的切割线X切割后的X-X剖面图。催化剂3的温度分布是通过实验得到的。根据图2中B,催化剂3的中心部与周边部的最大温差为56℃。另外,催化剂3的中心部的温度达到最高。
图3表示在不具备本实施例的还原剂喷射室4的情况下且从还原剂添加阀向排气中直接喷射还原剂的情况下的还原剂添加时的催化剂3的温度分布的图。图3中A表示装置的概要图,图3中B表示温度分布。图3中B是用与该催化剂3的中心轴正交的切割线Y切割后的Y-Y剖面图。催化剂3的温度分布是通过实验得到的。
在不具备本实施例的碰撞壁41的情况下,从还原剂添加阀喷射的还原剂与相面对的壁面碰撞。此时,由于还原剂的冲势因排气的气流而减弱,因此还原剂的大部分附着于排气通路2的壁面上,从此处扩散。由此,在催化剂3内与还原剂添加阀相面对的壁面侧的温度变得特别高。另外,催化剂3的中心部的温度上升变得不够充分。而且,根据图3中B,催化剂3的中心部与周边部的最大温差为256℃。
图4是表示在不具备本实施例的还原剂喷射室4的情况下且在排气的气流中具备用于使还原剂碰撞的分散板500的情况下的还原剂添加时的催化剂3的温度分布的图。图4中A表示装置的概要图,图4中B表示温度分布。图4中B是用与该催化剂3的中心轴正交的切割线Z切割后的Z-Z剖面图。催化剂3的温度分布是通过实验得到的。
通过将还原剂与分散板500碰撞,与图3所示的情况相比,还原剂的微粒化得到促进。但是,催化剂3的中心部的温度上升不够充分。也就是说,在从还原剂添加阀喷射的还原剂到达分散板500之前,还原剂的贯穿力就因排气的气流而降低。因此,可以认为,还原剂不与分散板500碰撞,或即使碰撞了也由于冲势弱而使微粒化变得不充分。而且,根据图4中B,催化剂3的中心部与周边部的最大温差为126℃。
这样,根据本实施例,可以减小催化剂3内的温差。另外,可以使催化剂3的中心部的温度充分地上升。
而且,如果全部满足以下的(1)到(4)的条件,则也可以采用本实施例的结构以外的结构。(1)在与还原剂添加阀最近的距离并且在排气通路2的外侧,设置用于还原剂碰撞的壁。(2)按照沿不直接面对排气的气流的方向喷射还原剂的方式设置还原剂添加阀。(3)由壁弹回的还原剂与流动于排气通路中的排气的气流汇流。(4)还原剂的全部与壁碰撞。
实施例2
本实施例在如下的方面与实施例1不同,即,在还原剂喷射室4内具备用于使还原剂碰撞的碰撞板42,且不具备碰撞壁41。
图5是表示应用本实施例的内燃机的排气净化装置的内燃机及其排气系统的概略构成的图。
还原剂添加阀5朝向碰撞板42喷射还原剂。而且,碰撞板42设于从还原剂添加阀5喷射的还原剂的全部进行碰撞的位置。
另外,按照使从还原剂添加阀5喷射还原剂的方向朝向排气的气流的下游侧的方式,来安装该还原剂添加阀5。对于此,只要向比与排气通路2的中心轴正交的面且包含还原剂添加阀5的喷孔的面靠下游的下游侧喷射还原剂即可,不需要与排气的气流方向平行地喷射。
而且,在碰撞板42中,开设有用于使还原剂的一部分通过的多个孔。对于此,也可以在一片板上开设多个孔,还可以是将棒状或纤维状的金属或树脂以格子状配置。进而,还可以是将金属或树脂编织成网状后的部件。而且,本实施例中,碰撞板42相当于本发明的“碰撞部”及“具有多个孔的板”。
也就是说,从还原剂添加阀5喷射的还原剂的一部分通过碰撞板42的孔。此时,如果还原剂在与碰撞板42碰撞的同时通过孔,则还原剂就被微粒化。另外,在还原剂通过碰撞板42时,由于在孔的周围气体的涡流变大,因此微粒化得到促进。
另外,与碰撞板42碰撞而弹回的还原剂因该碰撞而促进了微粒化。
此外,按照使从还原剂添加阀5喷射的、其后通过孔的还原剂及与该碰撞板42碰撞而弹回的还原剂搭乘上流过排气通路2的排气的气流的方式,来决定还原剂添加阀5的安装位置及喷射角度、以及碰撞板42的形状及设置位置。也以同样方式决定碰撞板42的孔的位置和数目。这些也可以通过实验等得到。而且,图5中的箭头表示还原剂的行进方向。
这样,根据本实施例,可以促进还原剂的微粒化。另外,由于排气的气流不直接面对还原剂添加阀5,因此可以抑制该还原剂添加阀5的喷孔堵塞的情况。进而,由于在排气的气流中不存在还原剂添加阀5及碰撞板42,因此可以抑制排气损耗的增加。

Claims (3)

1.一种内燃机的排气净化装置,具备喷射还原剂的还原剂添加阀、还原剂添加阀安装部和碰撞部,其中,使来自所述还原剂添加阀的还原剂的喷射方向朝向所述碰撞部,并且朝向比该还原剂添加阀靠下游的排气的下游侧,其特征在于,
所述还原剂添加阀安装部,其在流动于内燃机的排气通路中的排气气流的外侧具有用于所述还原剂添加阀喷射还原剂的空间,并且设置有所述还原剂添加阀;和
所述碰撞部,其存在于所述还原剂添加阀安装部,从所述还原剂添加阀喷射的还原剂与其碰撞。
2.根据权利要求1所述的内燃机的排气净化装置,其特征在于,所述碰撞部设置为,从所述还原剂添加阀喷射的还原剂的全部都与所述碰撞部碰撞,由该碰撞部弹回的还原剂到达流动于排气通路中的排气气流。
3.根据权利要求1所述的内燃机的排气净化装置,其特征在于,所述碰撞部构成为具备具有多个孔的板,且该碰撞部设置为,通过该孔的还原剂及由该板弹回的还原剂到达流动于排气通路中的排气气流。
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