CN105765192A - 废气后处理装置 - Google Patents

废气后处理装置 Download PDF

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CN105765192A
CN105765192A CN201480063538.5A CN201480063538A CN105765192A CN 105765192 A CN105765192 A CN 105765192A CN 201480063538 A CN201480063538 A CN 201480063538A CN 105765192 A CN105765192 A CN 105765192A
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inducing
pipe
exhaust aftertreatment
aftertreatment device
mixing arrangement
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CN105765192B (zh
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S·克勒克纳
C·阿尔特
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Robert Bosch GmbH
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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
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
    • B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
    • 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
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141—Injector 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
    • 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
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4315—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being deformed flat pieces of material
    • 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
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/43197—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor characterised by the mounting of the baffles or obstructions
    • B01F25/431974—Support members, e.g. tubular collars, with projecting baffles fitted inside the mixing tube or adjacent to the inner wall
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • 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]
    • 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
    • F01N2240/00—Combination 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
    • F01N2240/20—Combination 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
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/102—Adding 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
    • 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

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  • Chemical & Material Sciences (AREA)
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  • Combustion & Propulsion (AREA)
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  • Exhaust Silencers (AREA)

Abstract

本发明涉及一种装置(1)、尤其是废气后处理装置(1)，该装置具有：管(2)、尤其是排气管，气体流、尤其是内燃机的废气通过该管被引导；配属给该管的喷射装置(7)，用于定量地将液态介质、尤其是废气后处理剂喷射到气体流中；以及至少一个混合装置(11)，所述混合装置在喷射装置(7)的下游布置在所述管(2)中并且具有布置在一个平面(E)中的多个导气元件(14)。设置，所述平面(E)至少基本上垂直于所述喷射装置(7)的喷射方向地取向。

Description

废气后处理装置
技术领域
本发明涉及一种装置，尤其是废气后处理装置，该装置具有：管、尤其是排气管，气体流、尤其是内燃机的废气被该管引导；配属给该管的喷射装置，用于定量地将液态介质、尤其是废气后处理剂喷射到所述气体流中；以及至少一个混合装置，所述混合装置在喷射装置的下游布置在所述管中并且具有布置在一个平面中的多个导气元件。
背景技术
开头提到的类型的装置已由现有技术已知。对于减少包含于内燃机废气中的氮氧化物，用于选择性催化还原(SCR)的方法已被证明为是有效的。在该方法中，氮氧化物与选择性催化器中的氨一起被转化为氮气和水。替代于氨，为催化转化氮氧化物所需的还原剂以尿素水溶液的形式被携带于车辆的储备箱中并且借助于喷射装置被喷射到内燃机的废气中，以在下游在催化器中与废气执行希望的反应。为了更好地混合废气与废气后处理剂还已知的是，在定量装置的下游设置具有导气元件的混合装置，所述混合装置作为静态混合器促进废气后处理剂与废气的混合。相应的装置例如由DE102006011890Al已知。DE10060808A1也示出一种相应的混合装置，但是该混合装置布置在定量装置的上游。
发明内容
根据本发明的具有权利要求1特征的装置具有的优点是，液态介质或废气后处理剂被进一步更好地与气体流混合，使得尤其确保较大的液滴裂开成小液滴，所述小液滴导致废气中的废气后处理剂更好地蒸发。此外，通过根据本发明的构造来避免：液滴残留在管或者说排气管的壳壁的与定量装置对置的侧面上并且导致结晶沉积。根据本发明的装置的特征在于，导气元件所在的平面至少基本上垂直于喷射装置的喷射方向地取向。喷射装置通常具有主喷射方向或具有喷射轴线，所喷射的废气后处理剂的喷射锥围绕该喷射轴线成形。通过使导气元件所在的平面垂直于所述喷射方向地取向来实现：与传统的混合装置相比，增大用于所喷射的介质的碰撞面。由此实现碰撞到导气元件上的大液滴更多地裂开成较小液滴。由此提高液态介质的蒸发率并从而使引入的介质与气体流更好地混匀。同时，不与混合装置形成接触地穿过该混合装置的液滴的量被减小。此外，更少的液滴碰撞到所述管的壳壁的与喷射装置对置的侧面上，其原因是导气元件通过所述平面在排气管中的倾斜取向而也延伸入该区域中。由此减小结晶化沉积的危险且提高所述装置或者说所述废气后处理装置的使用寿命。管的壳壁优选至少在与定量装置对置的侧面上具有提高的表面粗糙度，所述提高的表面粗糙度有助于减小结晶化沉积或避免结晶化沉积。
根据本发明的一种有利扩展方案设置，导气元件构造成翼状并且至少基本上径向取向地、分布在管的周边上地布置。因此在俯视图中或在沿流动方向看向混合装置时，混合装置具有螺旋桨状的结构。通过径向取向的导气元件产生废气后处理剂与废气的有利混合，所述有利混合导致废气后处理方面的相应优点。
此外优选设置，导气元件相对于混合装置上游的管中的气体流的流动方向至少基本上倾斜地取向。由此与径向布置相关联地实现将涡旋引入到废气中，由此混合被进一步优化。
优选地，沿着所述导气元件的分别至少基本上径向取向的纵向轴线，所述导气元件自身扭曲。由此在各个导气元件上提供不同的碰撞角度，其中，所述碰撞角度可根据在管中的径向位置通过扭曲来针对气体流做最佳调整。
根据本发明的一种有利扩展方案设置，导气元件相对于管的壳壁具有径向间距。由此形成导气元件与管的壳壁的热脱耦，其中，气体流流过残留的缝隙。由此实现，在运行中，导气元件持久地通过气体流被加热，而所引入的热量不会再经由管的壳壁被导出。优选地，一些、特别优选全部的导气元件与管的壳壁在径向上隔开间距地布置，使得在导气元件和壳壁之间产生环形缝隙。通过持久加热和小的热量导出进一步优化混合情况，尤其进一步优化液滴的裂开和蒸发。
此外，根据一种优选实施方式设置，导气元件布置支撑元件上，该支撑元件至少基本上居中地布置在所述管中。通过将导气元件布置并且尤其固定在所述居中地布置的支撑元件上，例如可简单地实现上述的相对于壳壁的径向间距。
所述支撑元件优选构造为管元件，导气元件朝内突出地布置在该管元件的管壁上。即根据该实施方式设置，导气元件在外部与该管元件连接，其中，导气元件的朝内指向的端部优选构造成自由伸出，或替代地构造成相互连接。特别优选地在此设置，管元件的直径与排气管的直径相比选择得小到这种程度，使得在它们两之间残留有环形缝隙，在运行时，废气持久地流过该缝隙，这导致上面提到的在混合装置持久加热方面的优点。管元件在此优选具有径向向外突出的间隔件，所述间隔件例如可与管元件一体地构造且确保管元件在管中的定位。
根据本发明的一种替代实施方式设置，支撑元件构造为管元件，导气元件向外指向排气管壳壁的方向地布置在该管元件的壳壁上。在此，该管元件具有与排气管的直径相比很小的直径。该管元件在此优选由支撑元件承载，所述支撑元件优选垂直地伸入到排气管中并且布置在导气元件的下游。
根据本发明的一种优选扩展方案设置，导气元件与管元件一体地构造。在优选地由面式冲压件制成管元件或混合装置时，导气元件可通过弯曲被引入到根据本发明所希望的位置和取向，由此产生低的制造成本和简单的装配。管元件自身在此可配合精确地***到管中、并且优选在形成过盈配合的情况下***，或通过单独的保持器件保持布置在管中。
此外优选设置，至少有两个混合装置在流动方向上前后相继地布置在喷射装置下游的排气管中。在此，至少位于上游的混合装置根据本发明构造。第二混合装置的导气元件根据第一实施方式地优选布置在一平面中，该平面平行于位于上游的混合装置的平面。替代地，优选设置，布置在下游的混合装置的导气元件布置为相对于所述管成一个不那么陡的并且更可以说轴线平行的角度。特别优选，布置在下游的混合装置的导气元件位于一个垂直于排气管中轴线地取向的平面中。通过设置两个混合装置或两级混合器进一步减小结晶化沉积的危险，因为通过至少两级的混合器阻止更多的液滴碰到管的壳壁的与定量装置对置的侧面。
附图说明
在下文中会根据实施例对本发明进行详细解释。附图示出：
图1以简化的剖视图示出废气后处理装置，
图2以立体图示出废气后处理装置的混合装置，
图3混合装置的侧视图，
图4以俯视图示出混合装置的第二实施例，
图5以俯视图示出混合装置的第三实施例，
图6图5的混合装置的细节图，
图7以简化的截面图示出具有两个混合装置的废气后处理装置。
具体实施方式
图1以简化的侧视图示出用于机动车内燃机的废气后处理装置1。该废气后处理装置1具有排气管2，内燃机的废气通过该排气管被引导到催化器3。排气管2在此切开地示出。在排气管2的壳壁4的在该附图中位于上部的一侧，该排气管2具有开口5，该开口通过在此未详细示出的喷射装置7的凸缘6遮盖。喷射装置7具有通过图1中的轴线8表明的喷射方向。该轴线相对于排气管2的纵向轴线9倾斜地取向，使得通过喷射装置7喷射的废气后处理剂、尤其是尿素水溶液在废气的流动方向(如通过箭头10表明)上倾斜地被喷射到排气管2中。
在排气管2中，在喷射装置7的下游还布置有混合装置11，该混合装置用于影响废气以及所喷射的废气后处理剂的流动，使得废气和废气后处理剂有利地且最佳地相互混合或者掺混，以能在位于更下游的催化器3中执行希望的反应。
图2和3以立体图(图2)和侧视图(图3)示出混合装置11的第一实施例。混合装置11具有管元件12，该管元件的外直径至少基本上相应于排气管2的内直径。特别优选的是，这些直径这样选择，使得在管元件12和排气管2之间形成过盈配合。管元件12由面式冲压件成型而成。管元件12在其面向喷射装置7的端侧上具有在周边上均匀分布地布置的多个舌片13，这些舌片分别径向向内弯曲并且当前分别具有相同的长度。在此，这些舌片的弯曲部位这样布置，使得这些舌片布置在一个平面E中，该平面倾斜于轴线9地并且尤其垂直于轴线8地、即垂直于喷射装置7喷射方向地取向。这些舌片13相互隔开间距地布置并且构造成翼状，从而它们形成导气元件14。其中，在排气管中在流动方向上位于较前面的舌片13以及在流动方向上位于略后面的舌片13与布置在一半高度上的舌片13相比优选构造得稍微长些，使得这些舌片13居中地基本上在它们的尖端上相互间具有相等的间距。
通过导气元件14全部布置在平面E中来实现：用于喷射的废气后处理剂的碰撞面与传统的混合装置相比变得更大并且由此实现大液滴更多地裂开为较小液滴。也由此提高蒸发率和改善废气后处理剂与废气流的混匀。通过平面E的倾斜取向还实现：只有更少的液滴能碰撞到壳壁4的与喷射装置7对置的侧面上、残留在那里和导致结晶化沉积。
图4以俯视图示出混合装置11的第二实施例。在此，导气元件14也构造成翼状并且与管元件12在径向外部连接。在此也可设置，导气元件14如之前描述的那样与管元件一体地构造。在第一实施例中将管元件12设置为与排气管2面式地贴靠，而根据图4中的实施例设置，管元件12具有分布在周边上地布置的多个间隔件15，这些间隔件径向向外突出，以在管元件12与排气管2或排气管2壳壁4之间设置限定的间距。符合目的的是，设置有至少三个间隔件15。特别优选的是，间隔件15同样与管元件12一体地构造并且例如构造为弯曲出的板件舌部。通过保持件15，在管元件12和排气管4之间在径向上设置环形缝隙16，在运行时，该环形缝隙持续地被内燃机的高温废气流过。因为管元件12基本上与排气管2的壳壁4热脱耦，所以热量一旦被引入到混合装置11中就不会被进一步导出到排气管2上。因此，混合装置11持久地被加热并且导致喷射的废气后处理剂的更好的蒸发。
图5示出混合装置11的第三实施例，该实施例与之前这些实施例的区别基本上仅在于，导气元件14并非在径向外部，而是在径向内部保持在支撑元件17上，该支撑元件当前构造为管元件。在此，导气元件14径向向外延伸这么远，使得导气元件14和排气管2的壳壁4之间残留有缝隙，以实现之前所述的热脱耦作用。
图6示出图5中的混合装置11的放大局部图，在该图中可看到壳壁4和导气元件14之间的缝隙。
图6还示出废气后处理装置1的如下可选扩展方案：两个混合装置11前后相继地布置在排气管2中。由此，如在图6中示出的那样，排气管2中的两个混合装置11的导气元件14位于相互隔开间距的两个平面中。在此，至少位于上游的混合装置的平面如之前描述的那样垂直于喷射装置7的喷射方向地取向。位于下游的混合装置的导气元件所在的平面可如在图7中示出的那样平行于布置在上游的混合装置的平面，或例如也可垂直于排气管2的纵向轴线9。当然也还可设置为相应地布置有其他混合装置。
图7基本上以另一纵剖图示出由图1已知的废气后处理装置。与图1的实施例有区别的是，现在设置为：如针对图6已提到过的那样，两个混合装置11前后相继地布置在管或者说排气管2中。由此产生已提到的优点。两个混合装置11在此布置在一个共同的管元件12中并且优选如在图7中示出的那样相互一体地构造。
有利的废气后处理装置1总体上提供以下优点，即避免废气后处理剂的液滴碰撞到位于喷射装置7对面的管壁上并且改进液滴的蒸发和裂开。在此，通过将导气元件14尤其取向为处于垂直于喷射方向的平面E中而在更好的混合特性的情况下减少混合器的压力损失。由此产生相对于传统混合装置的另一优点，在所述传统混合装置中，压力损失随混合而增大。通过将导气元件14垂直于喷射装置7喷射方向地定向，使通过将导气元件投影到垂直于排气管轴线9的平面中而形成的面与传统混合器相比减小。这导致在改善混合特性的同时减小由于混合器引起的反压力。

Claims (10)

1.装置(1)、尤其是废气后处理装置(1)，所述装置具有：管(2)、尤其是排气管，气体流、尤其是内燃机的废气流通过该管被引导；配属给该管的喷射装置(7)，该喷射装置用于定量地将液态介质、尤其是废气后处理剂喷射到所述气体流中；以及至少一个混合装置(11)，所述混合装置在所述喷射装置(7)的下游布置在所述管(2)中，并且所述混合装置具有布置在一个平面(E)中的多个导气元件(14)，其特征在于，所述平面(E)至少基本上垂直于所述喷射装置(7)的喷射方向地取向。
2.根据权利要求1所述的废气后处理装置，其特征在于，所述导气元件(14)构造成翼状并且至少基本上径向取向地、分布在所述管(2)的周边上地布置在所述管(2)中。
3.根据前述权利要求中任一项所述的废气后处理装置，其特征在于，所述导气元件(14)相对于所述混合装置(11)上游的管(2)中的气体流的流动方向至少基本上倾斜地取向。
4.根据前述权利要求中任一项所述的废气后处理装置，其特征在于，沿着所述导气元件的分别至少基本上径向取向的纵向轴线，所述导气元件(14)自身扭曲。
5.根据前述权利要求中任一项所述的废气后处理装置，其特征在于，所述导气元件(14)相对于所述管(2)的壳壁(4)具有径向间距。
6.根据前述权利要求中任一项所述的废气后处理装置，其特征在于，所述导气元件(14)布置在支撑元件(17)上，所述支撑元件居中地布置在所述管(2)中。
7.根据前述权利要求中任一项所述的废气后处理装置，其特征在于，支撑元件(17)构造为管元件(12)，所述导气元件(14)径向向内突出地布置在该管元件上。
8.根据前述权利要求中任一项所述的废气后处理装置，其特征在于，支撑元件构造为管元件(12)，所述导气元件(14)径向向外指向所述管(2)的壳壁(4)的方向地布置在该管元件上。
9.根据前述权利要求中任一项所述的废气后处理装置，其特征在于，支撑元件(14)与管元件(12)一体地构造。
10.根据前述权利要求中任一项所述的废气后处理装置，其特征在于，至少两个混合装置(11)在流动方向上前后相继地布置在所述管(2)中。
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