CN104114824B - 内燃机 - Google Patents

内燃机 Download PDF

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CN104114824B
CN104114824B CN201280069587.0A CN201280069587A CN104114824B CN 104114824 B CN104114824 B CN 104114824B CN 201280069587 A CN201280069587 A CN 201280069587A CN 104114824 B CN104114824 B CN 104114824B
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internal combustion
combustion engine
catalytic converter
scr catalytic
pipe
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CN104114824A (zh
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T·奥伯诺斯
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AVL List GmbH
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AVL List 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
    • F01N3/18—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]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • 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
    • F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
    • 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
    • F01N13/14—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 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • F01N13/145—Double-walled exhaust pipes or housings with gas other than air filling the space between both walls
    • 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
    • F01N13/1811—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration
    • F01N13/1816—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body with means permitting relative movement, e.g. compensation of thermal expansion or vibration the pipe sections being joined together by flexible tubular elements only, e.g. using bellows or strip-wound pipes
    • 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
    • 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
    • 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
    • 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
    • F01N2240/36—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 an exhaust flap
    • 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/08—Gas passages being formed between the walls of an outer shell and an inner chamber
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/16—Plurality of inlet tubes, e.g. discharging into different chambers
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
    • 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
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/08—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for heavy duty applications, e.g. trucks, buses, tractors, locomotives
    • 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
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/10—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for stationary applications
    • 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
    • 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
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2875—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration by using elastic means, e.g. spring leaves, for retaining catalyst body in the housing
    • 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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  • 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)

Abstract

本发明涉及一种内燃机、特别是大型多种燃料柴油内燃机，该内燃机包括：可被绕过的SCR催化转化器(1)；至少一个控制元件(8,9)，该控制元件用于使流在排气管线(11)内于SCR催化转化器(1)工作的第一位置和SCR催化转化器(1)被绕过的第二位置之间切换；以及绕过SCR催化转化器(1)的至少一个流动路径(S2)。根据本发明，为了以简单又节约空间的方式在高负荷发动机操作模式下避免SCR催化转化器(1)的不可接受的污染或甚至损坏，绕过SCR催化转化器(1)的流动路径(S2)形成为两个较佳为同轴的同心管(3,4)之间的环状空间(5)，其中，SCR催化转化器(1)被内管(3)容纳，且第一供给管(6)引向内管(3)，而第二供给管(7)引向旁路流动路径(S2)。

Description

内燃机
技术领域
本发明涉及一种内燃机、特别是大型多种燃料柴油内燃机，该内燃机包括：可被绕过的SCR催化转化器；至少一个控制元件，该控制元件用于使在排气管线内的流动在SCR催化转化器起作用的第一位置和SCR催化转化器被绕过的第二位置之间切换；以及绕过SCR催化转化器的至少一个流动路径。
背景技术
由DE 10 2005 015479 A1已知借助旁路管线绕过SCR催化转化器(SCR＝选择性催化还原)以将流经催化转化器的废气温度保持在一定范围内。
FR 2 914 947 A1公开了具有废气管线的内燃机，该废气管线包含SCR催化转换器，在此，为了绕过SCR催化转换器而设有由控制元件控制的旁路管线。
DE 44 21 257 A1描述了一种具有两组气缸的内燃机，这些气缸能独立地切换，每组具有其自己的废气催化转化器。为了避免在切断对应的气缸时使催化转化器冷却到其操作温度以下，将整个废气管线设计成从切断的气缸组排出的气体被起作用的气缸组的废气加热。没有设置旁路管线来绕开催化转换器。
此外，由EP 0 580 931 A1已知一种具有可绕开的启动催化转化器的内燃机，其中，为了在启动催化转化器起作用的冷操作状态与启动催化转化器被绕过的热操作状态之间可靠且快速地切换，将控制元件构造为可滑动的环形排气套管，该排气套管能沿排气管线滑动并且与其同轴。
特别是在大型多种燃料船用发动机的情况下，排气质量明显取决于所用的燃料。为了符合沿海水域的严格排气规定，在船用发动机中使用SCR催化转化器等措施来减少亚硝气。为了避免SCR催化转化器的污染和损坏，当发动机以重燃料油运行时，SCR转化器能借助旁路管线被绕过。然而，外部的旁路管线具有大幅增加该发动机所需空间的缺点。作为另一缺点，不起作用的SCR转化器将冷却到最小操作温度以下。
发明内容
本发明的目的是避免这些缺点并且通过简单又节省空间的措施在困难的操作条件下防止SCR催化转化器的任何不可接受的污染或损坏。
根据本发明，此目的通过提供绕过SCR催化转化器的流动路径来实现，该流动路径构造成较佳为同轴的两个同心管之间的环状空间，而SCR催化转化器放置于内管内，而第一进入管引向内管，第二进入管引向旁路流动路径。
旁路流动路径相对于包含SCR催化转化器的内管的同心构造将允许非常紧凑的设计。
借助第一进入管内的第一控制元件，可打开或关闭至SCR催化转化器的流动路径。在第一控制元件的上游，附加的计量装置位于用于尿素水溶液的第一进入管内。
在第二进入管中，可设置有打开或关闭旁路流动路径的第二控制元件。在气体操作或低排放操作过程中，SCR催化转化器起作用，而在重油操作过程中它不起作用。
由于旁路流动路径包围SCR催化转化器，所以转化器即便在其不起作用状态下也由于被排气包围而被加热。由此，SCR催化转化器完全可在非常短的时间内运行。
为了削减振动并且补偿长度上的热变化，可在本发明的另一变型中规定至少一个补偿元件设置在内和/或外管的至少两个轴向间隔开的部段之间或者在内管或外管与第一或第二进入管之间。通过将补偿元件集成到SCR催化转化器的外壳内，进一步节省空间和减小振动，并且在SCR转化器的外壳内实现长度补偿。在特别紧凑和易于制造的变型中，可规定第一补偿元件和第二补偿元件构造成共同双补偿件单元，第一和第二补偿元件较佳地由径向腹板来连接。
附图说明
现在参照附图来更详细地阐释本发明。
各附图示意地示出根据本发明的内燃机的SCR催化转化器的各种变型的纵向部段。
具体实施方式在所有变型中，SCR催化转化器1设置在外壳2内，该外壳包括包围出环状空间5的两个同心的径向间隔开的管3、4。SCR催化转化器放置于内管3内。环状空间5形成用于绕过SCR转化器的流动路径S2。
内管3连接到第一进入管6，而外管4连接到第二进入管7。在第一进入管6内设置有第一控制元件8，例如是切换翼板，该第一控制元件允许废气流S1到达SCR催化转化器1或者防止其到达SCR催化转化器。另一控制元件9可位于第二进入管7内，该另一控制元件也可构造成简单的切换翼板(图3、4)。进入管6、7可构造成弯曲的或S形管，其中第一进入管6在第二进入管7内部分地延伸(参见图2到4)。如图4中所示，两个进入管6、7可从共同的废气管线11引出。
在第一控制元件8上游设有附加的计量装置10，用以将作为反应剂的尿素水溶液馈送到SCR催化转化器内。
除了已经提及的优点、即紧凑设计和保护转化器免于受到污染，该变型还提供附加的计量装置10与SCR催化转化器1之间的至少部分加热的混合路径，这是因为内管3被热废气围绕并且由此被热废气加热。这将确保还原剂的良好蒸发和混合并且将抑制还原剂沉积在内管的内表面上。
图5和6示出如下变型：至少一个第一或第二补偿元件12、13设置在内管3或外管4的轴向间隔开的部段之间和/或内管3和第一进入管6之间或者外管4与第二进入管7之间，以补偿振动和/或热量引发的长度变化。图5示出具有用于内管3和外管4的分离的补偿元件12、13。在图6中，补偿元件12、13借助径向腹板14来连接，从而形成双补偿件单元15。双补偿件单元15可安装成一个零件。

Claims (10)

1.一种内燃机，所述内燃机包括：能被绕过的SCR催化转化器(1)；至少一个控制元件(8,9)，用以使在废气管线(11)内的流动在所述SCR催化转化器(1)起作用的第一位置与所述SCR催化转化器(1)被绕过的第二位置之间切换；以及至少一个流动路径(S2)，所述流动路径绕过所述SCR催化转化器(1)，绕过所述SCR催化转化器(1)的所述流动路径(S2)构造成两个同轴的同心管(3,4)之间的环状空间(5)，其中，两个同心管包括内管(3)和外管(4)，所述SCR催化转化器(1)位于所述内管(3)内，其特征在于，第一进入管(6)连接到所述内管(3)，而第二进入管(7)连接到旁路流动路径(S2)，所述第一进入管部分地在所述第二进入管内延伸，第一控制元件(8)设置在所述第一进入管(6)内，其中，附加的计量装置(10)位于所述第一进入管(6)内。
2.如权利要求1所述的内燃机，其特征在于，第二控制元件(9)设置在所述第二进入管(7)内。
3.如权利要求1或2所述的内燃机，其特征在于，附加的计量装置(10)在所述第一控制元件(8)的上游。
4.如权利要求1或2所述的内燃机，其特征在于，附加的计量装置(10)定位在所述第一进入管(6)的弯部的上游。
5.如权利要求1或2所述的内燃机，其特征在于，所述第一进入管和第二进入管(6,7)从共同的废气管线(11)引出。
6.如权利要求1或2所述的内燃机，其特征在于，至少一个第一补偿元件(12)设置在所述内管(3)的至少两个轴向间隔开的部段之间或者所述内管(3)和所述第一进入管(6)之间。
7.如权利要求6所述的内燃机，其特征在于，至少一个第二补偿元件(13)设置在所述外管(4)的至少两个轴向间隔开的部段之间或者所述外管(4)和所述第二进入管(7)之间。
8.如权利要求7所述的内燃机，其特征在于，所述第一补偿元件(12)和所述第二补偿元件(13)构造成共同的双补偿件单元(15)。
9.如权利要求8所述的内燃机，其特征在于，所述第一补偿元件(12)和所述第二补偿元件(13)借助径向腹板(14)连接。
10.如权利要求1所述的内燃机，其特征在于，所述内燃机是大型多种燃料柴油内燃机。
CN201280069587.0A 2011-12-14 2012-12-13 内燃机 Active CN104114824B (zh)

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