DE102016205299A1 - Internal combustion engine with exhaust aftertreatment system - Google Patents

Abstract

Internal combustion engine (1) with an exhaust aftertreatment system (3), namely with an SCR exhaust aftertreatment system, wherein the internal combustion engine (1) comprises a plurality of cylinders (7), wherein the exhaust aftertreatment system (3) at least one in at least one reactor chamber (10) arranged SCR catalyst (9), an exhaust gas supply line (8) leading to the respective reactor space (10) and respective SCR catalytic converter (9), an exhaust gas discharge line (11) leading away from the respective reactor space (10) and respective SCR catalytic converter (9), one of the respective exhaust gas supply lines (8) associated with introduction means (16) for introducing a reducing agent, in particular of ammonia or an ammonia precursor substance, in the exhaust gas, and a downstream of the respective introduction means (16) arranged mixing section (18) for mixing the exhaust gas with the reducing agent upstream of the respective SCR catalyst (9), wherein the internal combustion engine according to at least one of a group of cylinders (7) lone exhaust gas collector (4), and wherein the exhaust gas from the respective exhaust manifold (4) via the exhaust aftertreatment system (3), namely the respective reactor space (10) and the respective SCR catalyst (9), and downstream of the exhaust aftertreatment system (3) via at least one exhaust gas turbocharger (5) of an exhaust gas charging system (2) can be guided.

Description

The invention relates to an internal combustion engine with an exhaust aftertreatment system.

In combustion processes in stationary internal combustion engines, which are used for example in power plants, as well as combustion processes in non-stationary internal combustion engines, which are used for example on ships, resulting in nitrogen oxides, these nitrogen oxides typically in the combustion of sulfur-containing fossil fuels, such as coal, hard coal , Brown coal, petroleum, heavy fuel oil or diesel fuels. Therefore, such internal combustion engines are assigned exhaust aftertreatment systems that serve the cleaning, in particular the denitrification, of the exhaust gas leaving the internal combustion engine.

To reduce nitrogen oxides in the exhaust gas, so-called SCR catalysts are used in practice in exhaust gas aftertreatment systems known from practice. In a SCR catalyst, a selective catalytic reduction of nitrogen oxides takes place, whereby ammonia (NH ₃ ) is required as reducing agent for the reduction of the nitrogen oxides. The ammonia or an ammonia precursor substance, such as urea, for this purpose, is introduced into the exhaust gas upstream of the SCR catalyst in liquid form, with the ammonia or the ammonia precursor substance being mixed with the exhaust gas upstream of the SCR catalytic converter. For this purpose, mixing paths between the introduction of the ammonia or of the ammonia precursor substance and the SCR catalyst are provided according to the practice.

Although exhaust gas aftertreatment, in particular nitrogen oxide reduction, can already be successfully carried out using exhaust gas aftertreatment systems which comprise an SCR catalytic converter known from practice, there is a need to further improve the exhaust aftertreatment systems. In particular, there is a need to allow for a compact design, effective exhaust aftertreatment and effective operation of the exhaust aftertreatment system having internal combustion engine.

On this basis, the present invention seeks to provide a novel internal combustion engine, in particular a two-stroke internal combustion engine, with an exhaust aftertreatment system that can be effectively operated in a compact design and ensuring effective exhaust aftertreatment.

This object is achieved by an internal combustion engine according to claim 1. According to the invention, the internal combustion engine has at least one exhaust gas collector common to a group of cylinders, wherein the exhaust gas from the respective exhaust gas collector via the exhaust aftertreatment system, namely the respective reactor space and the respective SCR catalyst, and downstream of the exhaust aftertreatment system via at least one exhaust gas turbocharger of an exhaust gas charging system can be performed. The invention enables a compact design effective exhaust aftertreatment and effective operation of the internal combustion engine, in particular a two-stroke internal combustion engine.

According to an advantageous development, the respective mixing section and the respective exhaust gas collector and preferably also the respective exhaust gas supply line are combined to form a common assembly. This allows for a particularly compact design of the internal combustion engine, an effective exhaust aftertreatment and effective operation of the internal combustion engine, in particular a two-stroke internal combustion engine.

Preferably, the respective common assembly is designed such that the exhaust gas, starting from the respective exhaust manifold of the respective mixing section with a maximum of three deflections, preferably with a maximum of twice deflection, more preferably with a maximum simple deflection, most preferably without deflection fed. This allows for a compact design of the internal combustion engine, an effective exhaust aftertreatment and effective operation of the engine preferably designed as a two-stroke internal combustion engine.

According to an advantageous development, the respective exhaust gas inlet and the respective exhaust gas discharge from the same side of the respective reactor chamber open into the same or attack on the same side of the respective reactor space the same. This allows for a particularly compact design of the internal combustion engine, an effective exhaust aftertreatment and effective operation of the engine preferably designed as a two-stroke internal combustion engine.

According to a further advantageous embodiment, the respective common assembly is formed such that a distance between one of the respective catalyst or respective reactor chamber farthest cylinder-side exhaust port into the respective exhaust manifold and the respective catalyst or reactor space at most four times, preferably the maximum three times, more preferably the maximum two times, the distance between the respective catalyst or respective reactor space farthest lying cylinder-side exhaust gas discharge point in the respective exhaust manifold and one of the respective catalyst or respective reactor chamber closest cylinder-side exhaust port corresponds to the respective exhaust manifold. This allows for a particularly compact design of the internal combustion engine, an effective exhaust aftertreatment and effective operation of the engine preferably designed as a two-stroke internal combustion engine.

Preferably, the internal combustion engine comprises a bypass via which exhaust gas can be supplied to the respective reactor chamber, starting from the respective exhaust collector or the respective mixing section or the respective exhaust gas inlet of the respective exhaust gas outlet and starting from the respective exhaust gas outlet of a turbine of the exhaust gas charging system positioned downstream of the exhaust gas aftertreatment system. This allows for a compact design of the internal combustion engine, an effective exhaust aftertreatment and effective operation of the engine preferably designed as a two-stroke internal combustion engine.

The internal combustion engine is preferably a two-stroke internal combustion engine.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:

1 a schematic perspective view of an internal combustion engine according to the invention with an exhaust aftertreatment system;

2 a detail of the exhaust aftertreatment system of 1 ;

3 a detail of 2 ;

4 a schematic perspective view of a second internal combustion engine according to the invention with an exhaust aftertreatment system; and

5 a schematic perspective view of a third internal combustion engine according to the invention with an exhaust aftertreatment system.

The present invention relates to an internal combustion engine with an exhaust aftertreatment system, such as a stationary internal combustion engine in a power plant or on a ship used, non-stationary internal combustion engine. In particular, the invention relates to a heavy duty two-stroke marine diesel engine.

1 shows an arrangement of an internal combustion engine 1 with an exhaust gas turbocharging system 2 and an exhaust aftertreatment system 3 , In the internal combustion engine 1 it may be unsteady or stationary internal combustion engine, in particular a transiently operated marine engine. Exhaust gas, which cylinder 7 the internal combustion engine 1 leaves is in the exhaust charging system 2 used to extract from the thermal energy of the exhaust gas mechanical energy for compression of the internal combustion engine 1 to gain supplied charge air.

So shows 1 an internal combustion engine 1 with an exhaust gas turbocharging system 2 , which has at least one exhaust gas turbocharger 5 includes. Exhaust gas, which is the cylinder 7 the internal combustion engine 1 leaves, flows over a turbine 6 the exhaust gas turbocharger 5 and is relaxed in the same, wherein this energy recovered in a compressor of the exhaust gas turbocharger 5 is used to compress charge air. Preferably, the internal combustion engine comprises 1 a two-stage turbocharging system 2 with a high-pressure turbocharger and a low-pressure turbocharger.

In addition to the exhaust charging system 2 includes the internal combustion engine 1 the exhaust aftertreatment system 3 , which is an SCR exhaust aftertreatment system. The SCR exhaust aftertreatment system 3 is between the cylinders 7 the internal combustion engine 1 and the exhaust charging system 2 switched, so therefore exhaust, which is the cylinder 7 the internal combustion engine 1 leaves, first via the SCR exhaust aftertreatment system 3 and only then via the exhaust gas charging system 2 to be led.

1 shows an exhaust gas supply line 8th , about the exhaust, starting from the cylinders 7 the internal combustion engine 1 towards an SCR catalyst 9 can be performed in a reactor room 10 is arranged. Further shows 1 an exhaust gas discharge 11 , the discharge of the exhaust gas from the SCR catalyst 9 towards the turbine 6 the exhaust gas turbocharger 5 serves.

The internal combustion engine 1 of the 1 has one for all cylinders 7 common exhaust collector 4 on. Exhaust gas, which is the cylinders 7 the internal combustion engine 1 leaves, is starting from the exhaust collector 4 via the exhaust gas supply line 8th towards the exhaust aftertreatment system 3 namely, the respective reactor space 10 and the respective SCR catalyst 9 , and downstream of the exhaust aftertreatment system 3 over the exhaust gas turbocharger 5 the exhaust charging system 2 feasible.

The to the reactor room 10 and thus to the reactor room 10 positioned SCR catalyst 9 leading exhaust gas supply 8th as well as from the reactor room 10 and thus from the SCR catalyst 9 leading exhaust gas discharge 11 or the exhaust collector 4 and the exhaust gas discharge 11 are over a bypass 12 (please refer 2 ), in which a shut-off device 13 is integrated. When the shut-off device is closed 13 is the bypass 12 closed so that no exhaust gas can flow over the same. Then, however, when the obturator 13 opened, can over the bypass 12 Exhaust gas flow, past the reactor room 10 and therefore past the reactor room 10 positioned SCR catalyst 9 , 2 illustrated with arrows 14 the flow of exhaust gas through the exhaust aftertreatment system 3 at over the obturator 13 closed bypass 12 , in which 2 it can be seen that the exhaust gas supply line 8th in the reactor room 10 with a downstream end 15 opens, with the exhaust gas in the region of this end 15 the exhaust gas supply line 8th a flow deflection around about 180 ° or approximately 180 ° experiences, the exhaust after the flow deflection over the SCR catalyst 9 to be led.

The exhaust gas supply line 8th the exhaust aftertreatment system 3 is a loading device 16 assigned (see 2 ), via which a reducing agent can be introduced into the exhaust gas flow, in particular ammonia or an ammonia precursor substance, which is required in the region of the SCR catalyst 9 Defined to implement nitrogen oxides of the exhaust gas. In this introduction device 16 the exhaust aftertreatment system 3 it is preferably an injection nozzle, via which the ammonia or the ammonia precursor substance, such as urea, in the exhaust gas flow within the Abgaszuführleitung 8th is injected. 2 illustrated with a cone 17 the injection of the reducing agent into the exhaust gas flow in the region of the exhaust gas supply line 8th ,

The route of the exhaust aftertreatment system 3 , seen in the flow direction of the exhaust gas downstream of the introduction device 16 and upstream of the SCR catalyst 9 lies, is called a mixed route 18 designated. In particular, the exhaust gas supply line 8th downstream of the introduction device 16 a mixed route 18 in which the exhaust gas with the reducing agent upstream of the SCR catalyst 9 can be mixed.

The exhaust collector 4 and the mixing section 18 the internal combustion engine 1 are preferably together with the exhaust gas supply line 8th combined into a common assembly. In this case, according to the preferred embodiment of the 2 the exhaust gas supply line 8th which the mixing section 18 at least partially formed, seen in the flow direction of the exhaust gas coaxially behind the exhaust manifold 4 positioned, with the dosing then at the position 16c in 1 he follows. In order to extend the mixing section, additions are also possible in the exhaust collector before or between the supply of the exhaust gas feeds discharged from the individual cylinders into the exhaust collector ( 16a . 16b ). Here it makes sense, the mixing tube 18a in the exhaust collector 4 to expand and dose there.

According to 2 is the respective assembly of the internal combustion engine 1 which the exhaust collector 4 , the mixed route 18 and the exhaust gas supply line 8th designed, designed such that the exhaust gas, starting from the respective exhaust manifold 4 the respective mixing section 18 can be fed without deflection.

In 1 Accordingly, the exhaust gas experiences only when entering the exhaust manifold 4 in the area of cylinder-side exhaust gas discharge points 21 and entering the reactor room 10 in the area of the downstream end 15 the exhaust gas supply line 8th upstream of the SCR catalyst 9 a diversion. This is advantageous in order to ensure effective operation of the internal combustion engine with a compact design and effective exhaust aftertreatment.

The common assembly, which is the exhaust collector 4 , the mixed route 18 and the exhaust gas supply line 8th formed, is preferably formed such that a distance between a catalyst 9 or reactor space 10 most distant cylinder-side exhaust port 21 in the respective exhaust collector 4 and the catalyst 9 or reactor space 10 not more than four times, preferably not more than three times, more preferably not more than twice, the distance between the catalyst and the catalyst 9 or reactor space 10 most distant cylinder-side exhaust port 21 in the exhaust collector 4 and one from the catalyst 9 or reactor space 10 nearest cylinder-side exhaust port into the exhaust manifold 4 equivalent. This is also advantageous in order to ensure effective operation of the internal combustion engine with a compact design and effective exhaust aftertreatment.

The exhaust gas supply line 8th flows with the downstream end 15 in the reactor room 10 , This downstream end 15 the exhaust gas supply line 8th is a baffle element 19 (please refer 2 . 3 ), which is relative to the downstream end 15 the exhaust gas supply line 8th is relocatable. In the embodiment shown, the baffle element 19 relative to the end 15 the exhaust gas supply line 8th which is in the reactor room 10 flows, linearly displaceable. That in the reactor room 10 positioned and the downstream end 15 the exhaust gas supply line 8th opposite impact element 19 is relative to the downstream end 15 the exhaust gas supply line 8th relocatable to either the exhaust gas supply line 8th at the downstream end 15 shut off or the same at the downstream end 15 release.

Then, if the baffle element 19 the exhaust gas supply line 8th at the downstream end 15 shut off, is preferably the obturator 13 of the bypass 12 then open the exhaust completely on the SCR catalyst 9 or on which the SCR catalyst 9 receiving reactor space 10 passing out. Then, if the baffle element 19 the downstream end 15 the exhaust gas supply line 8th releases, the obturator can 13 of the bypass 12 either completely closed or at least partially open. Then, if the baffle element 19 the downstream end 15 the exhaust gas supply line 8th releases, is the relative position of the impact element 19 relative to the downstream end 15 the exhaust gas supply line 8th in particular of the exhaust gas mass flow through the exhaust gas supply line 8th and / or the exhaust gas temperature of the exhaust gas in the exhaust gas supply line 8th and / or the amount of the via the introduction device 16 in the exhaust gas flow introduced reducing agent dependent. Another function of the impact element 19 with released, downstream end 15 the exhaust gas supply line 8th is that possibly present in the exhaust stream drops of liquid reducing agent on the impact element 19 get trapped and atomized there to avoid such drops of liquid reducing agent in the area of the SCR catalyst 9 reach. About the relative position of the impact element 19 to the downstream end 15 the exhaust gas supply line 8th with the downstream end enabled 15 In particular, it can be determined whether the exhaust gas which is in the region of the downstream end 15 the exhaust gas supply line 8th in the area of the impact element 19 is deflected, more toward radially inwardly positioned sections or more towards radially outwardly positioned sections of the SCR catalyst 9 is directed or directed.

According to a preferred embodiment, the exhaust gas supply line 8th in the region of its downstream end 15 widened funnel-shaped formation of a diffuser. As a result, the flow cross section of the exhaust gas supply line increases 8th in the area of the downstream end 15 , where, in particular 2 can be taken, it can be provided that seen in the flow direction of the exhaust gas upstream of the downstream end 15 the exhaust gas supply line 8th the flow cross section of the same initially reduced.

So shows 2 in that the flow cross section of the exhaust gas supply line 8th seen in the flow direction of the exhaust gas downstream of the introduction device 16 is initially approximately constant for the reducing agent, then initially gradually tapers and finally in the region of the downstream end 15 extended. This extension of the flow cross-section at the downstream end 15 the exhaust gas supply line 8th takes place vorzugwseise over a shorter section of the exhaust gas supply line 8th , as the section over which the exhaust gas supply line 8th in front of the downstream end 15 initially rejuvenated. The impact element 19 is preferably at one of the exhaust gas supply line 8th facing side 20 is arched to form a flow guide for the exhaust, preferably curved like a bell. The page 20 of the baffle element 19 that is the downstream end 15 the exhaust gas supply line 8th facing, has at a radially inner portion of the impact element 19 a smaller distance to the downstream end 15 the exhaust gas supply line 8th on than at a radially outer portion thereof. The impact element 19 is in the center of the page 20 towards the downstream end 15 the exhaust gas supply line 8th arched against the flow direction of the exhaust gas.

The exhaust gas supply line 8th and the exhaust gas discharge 11 grab a common first page 22 of the reactor space 10 on or open or extend from this common side 22 in the reactor room 10 into it. In this case, the exhaust gas supply line extends 8th such in the reactor room 10 into that, the downstream end 15 the exhaust gas supply line 8th adjacent to one of the first page 22 of the reactor space 10 opposite second side 23 of the reactor space 10 is positioned, whereas the exhaust gas discharge 11 on the first page 22 in the reactor room 10 empties. About the exhaust gas supply line 8th supplied exhaust gas is in the range of the second side 23 of the reactor space 10 that is the downstream end 15 the exhaust gas supply line 8th is opposite, deflected by about 180 °, then flows over the SCR catalyst 9 and then on the first page 22 in the field of exhaust gas discharge 11 , The exhaust gas discharge 11 surrounds the exhaust gas supply line 8th adjacent to the first page 22 of the reactor space 10 partially outside, preferably concentric.

In the embodiment of 1 is the common assembly, which is the exhaust collector 4 , the mixed route 18 and the exhaust gas supply line 8th provides, carried out such that the exhaust gas, starting from the exhaust manifold 4 the respective mixing section 18 can be fed without deflection. This is, as already stated above, preferred.

In contrast show 4 and 5 Embodiments of internal combustion engines 1 in which the exhaust gas in its flow, starting from the exhaust manifold 4 in the area of the mixing section 18 and thus in the area of the exhaust gas supply line 8th undergoes a simple deflection, that is, once deflected, in each case by 90 °, namely the passage from the exhaust manifold 4 into the exhaust gas supply line 8th and therefore in the area of the mixing section 18 , Should be due to space reasons at the Internal combustion engine a multiple deflection of the exhaust gas may be required, it is provided in the sense of the invention that the assembly, which the exhaust manifold 4 , the exhaust gas supply line 8th and the mixing section 18 is prepared, is formed such that the exhaust gas from the exhaust manifold 4 the mixing section 18 with a maximum of three deflections, preferably with a maximum of twice deflection, the mixing section 18 is supplied.

While in the embodiment of 1 the exhaust gas from the exhaust manifold 4 deflection-free of the respective mixing section 18 can be supplied, experiences the exhaust gas in the embodiments of the 4 and 5 a deflection of approximately 90 °. With multiple deflection points, the deflection of the exhaust gas between the exhaust manifold 4 and mixed route 18 a maximum of 270 °, preferably a maximum of 180 °. A deflection of the exhaust gas between the exhaust manifold 4 and mixed route 18 a maximum of 90 ° is preferred, most preferred is the deflection-free supply of the exhaust gas, starting from the exhaust manifold 4 towards the mixing section 18 ,

In the embodiment of 1 and 4 is a horizontal arrangement of the exhaust aftertreatment system 3 selected. The exhaust collector 4 and the mixing section 18 as well as the exhaust gas supply line 8th thus extend in the horizontal direction. The reactor room 10 is together with the in the reactor room 10 absorbed SCR catalyst 9 on one side of the internal combustion engine 1 positioned horizontally. In this case, then all cylinders 7 the internal combustion engine 1 freely accessible for maintenance. Disassembly of the exhaust aftertreatment system 3 is to perform maintenance on the internal combustion engine 1 not mandatory.

In contrast, shows 5 An embodiment of an internal combustion engine according to the invention 1 in which the exhaust aftertreatment system 3 is positioned standing, wherein the reactor space 10 together with the one in the reactor room 10 absorbed SCR catalyst 9 therefore above the cylinder 7 the internal combustion engine 1 is arranged. Thus, while in the embodiments of the 1 and 4 the SCR catalyst 9 who is in the reactor room 10 is received, is traversed by the exhaust gas in the horizontal direction, takes place in the embodiment of 5 the flow through the SCR catalyst 9 in the vertical direction.

In the in 1 . 4 and 5 shown embodiments is all cylinders 7 the internal combustion engine 1 a common exhaust collector 4 assigned. All exhaust gas flows into this exhaust collector 4 and starting from the exhaust collector 4 in the area of the mixing section 18 , the exhaust gas supply line 8th and subsequently into the area of the reactor room 10 recorded SCR catalyst 9 ,

In contrast, it is also possible that the cylinder 7 the internal combustion engine 1 for example, are divided into two groups of cylinders, in which case each cylinder group each have a cylinder group individual exhaust manifold 4 assigned. In this case, then preferably each cylinder group is also a cylinder group-individual reactor space 10 with one in the reactor room 10 absorbed SCR catalyst 9 assigned.

In this case, then the in 1 shown assemblies, so exhaust manifold 4 , Mixed route 18 , Exhaust gas supply 8th , Reactor room 10 , SCR catalyst 9 and exhaust gas discharge 11 double existing, with a horizontal orientation of the exhaust aftertreatment system 3 a first reactor space 10 on a first side of the internal combustion engine 1 and a second reactor space 10 on an opposite second side of the internal combustion engine 1 is positioned so as to make optimum use of an available space.

The above details are particularly suitable for use in two-stroke internal combustion engines, which are operated with residual oil or with heavy oil or natural gas. However, the invention can also be used in four-stroke internal combustion engines.

The reactor room 10 is preferably designed in terms of its wall thickness so that it can withstand pressures of at least 3 bar, preferably of at least 4 bar, more preferably of at least 6 bar.

The invention extends not only to SCR exhaust aftertreatment systems but also to CH4 and HCHO oxidation catalysts.

LIST OF REFERENCE NUMBERS

1

Internal combustion engine

2

Turbocharging System

3

aftertreatment system

4

collector

5

turbocharger

6

turbine

7

cylinder

8th

exhaust lead

9

SCR catalyst

10

reactor chamber

11

Flue gas discharge

12

bypass

13

shutoff

14

exhaust system

15

The End

16

introducing device

17

Injection cone

18

mixing section

19

baffle

20

page

21

Exhaust opening point

22

page

23

page

Claims (16)

Internal combustion engine ( 1 ) with an exhaust aftertreatment system ( 3 ), wherein the internal combustion engine ( 1 ) several cylinders ( 7 ), and wherein the exhaust aftertreatment system ( 3 ) at least one in at least one reactor space ( 10 ) arranged catalyst ( 9 ), one to the respective reactor space ( 10 ) and respective catalyst ( 9 ) leading exhaust gas supply ( 8th ), one from the respective reactor space ( 10 ) and respective catalyst ( 9 ) leading exhaust gas discharge ( 11 ), characterized in that the internal combustion engine has at least one for a group of cylinders ( 7 ) common exhaust collector ( 4 ), wherein the exhaust gas from the respective exhaust manifold ( 4 ) via the exhaust aftertreatment system ( 3 ), namely the respective reactor space ( 10 ) and the respective SCR catalyst ( 9 ), and downstream of the exhaust aftertreatment system ( 3 ) via at least one exhaust gas turbocharger ( 5 ) of an exhaust gas charging system ( 2 ) of the internal combustion engine is feasible. Internal combustion engine according to claim 1, characterized in that the exhaust aftertreatment system ( 3 ) is an SCR exhaust aftertreatment systems, wherein one of the respective exhaust gas supply line ( 8th ) assigned to the introduction device ( 16 ) for introducing a reducing agent, in particular ammonia or an ammonia precursor substance, into the exhaust gas, and a downstream of the respective introduction device ( 16 ) arranged mixing section ( 18 ) for mixing the exhaust gas with the reducing agent upstream of the respective SCR catalyst ( 9 ) having. Internal combustion engine according to claim 2, characterized in that the respective exhaust gas collector ( 4 ) and the respective mixing section ( 18 ) of an SCR catalyst are combined into a common assembly. Internal combustion engine according to claim 3, characterized in that the respective exhaust gas supply line ( 8th ) is provided by the common assembly. Internal combustion engine according to claim 3 or 4, characterized in that the respective common assembly is designed such that the exhaust gas starting from the respective exhaust manifold ( 4 ) of the respective mixing section ( 18 ) with a maximum of three deflections, preferably with a maximum of twice deflection, more preferably with a maximum simple deflection, can be fed. Internal combustion engine according to one of claims 3 to 5, characterized in that the respective common assembly is designed such that the exhaust gas from the respective exhaust manifold ( 4 ) of the respective mixing section ( 18 ) with a deflection of a maximum of 270 °, preferably with a deflection of a maximum of 180 °, particularly preferably with a deflection of a maximum of 90 °, can be fed. Internal combustion engine according to claim 3 or 4, characterized in that the respective common assembly is designed such that the exhaust gas starting from the respective exhaust manifold ( 4 ) of the respective mixing section ( 18 ) can be fed without deflection. Internal combustion engine according to one of claims 1 to 7, characterized by a bypass ( 12 ), via the exhaust gas at the respective reactor space ( 10 ) passing by the respective exhaust collector ( 4 ) or the respective mixing section ( 18 ) or the respective exhaust gas supply line ( 8th ) of the respective exhaust gas discharge ( 11 ) can be fed. Internal combustion engine according to claim 8, characterized in that the exhaust gas, starting from the respective exhaust gas discharge ( 11 ) one downstream of the exhaust aftertreatment system ( 3 ) positioned turbine ( 6 ) of an exhaust gas turbocharger ( 5 ) of the exhaust gas charging system ( 2 ) can be fed. Internal combustion engine according to one of claims 1 to 9, characterized in that the respective exhaust gas supply line ( 8th ) and the respective exhaust gas discharge ( 11 ) from the same page ( 22 ) of the respective reactor space ( 10 ) out into the respective reactor space ( 10 ) or at the respective reactor space ( 10 attack). Internal combustion engine according to one of claims 1 to 10, characterized in that the respective common assembly is designed such that a distance between one of the respective catalyst ( 9 ) or respective reactor space ( 10 ) furthest away cylinder-side exhaust gas discharge point into the respective exhaust gas collector ( 4 ) and the respective catalyst ( 9 ) or respective reactor space ( 10 ) a maximum of four times, preferably a maximum of three times, more preferably a maximum of two times, the distance between the catalyst ( 9 ) or respective reactor space ( 10 ) farthest cylinder-side exhaust port into the respective exhaust manifold ( 4 ) and one of the respective catalyst ( 9 ) or respective reactor space ( 10 ) closest to the cylinder exhaust port in the respective exhaust manifold ( 4 ) corresponds. Internal combustion engine according to one of claims 1 to 11, characterized in that for all cylinders ( 7 ) a single exhaust collector ( 4 ) and a single mixing section ( 18 ) and a single reactor space ( 4 ) is available. Internal combustion engine according to one of claims 1 to 12, characterized in that for a first group of cylinders a first common exhaust manifold and a first common mixing section and a first common reactor space and for a second group of cylinders, a second common exhaust manifold and a second common mixing section and a second common reactor space are present, which are offset by 180 ° to each other such that on both sides of the internal combustion engine in each case a reactor space is present. Internal combustion engine according to one of claims 1 to 13, characterized in that the internal combustion engine is a two-stroke internal combustion engine. Internal combustion engine according to one of claims 1 to 14, characterized in that the supply of the reducing agent locally before the supply of exhaust gas of a cylinder in the exhaust manifold ( 4 ) he follows ( 16a . 16b ). Internal combustion engine according to one of claims 1 to 15, characterized in that the mixing tube ( 18 ) in the exhaust collector ( 4 ) is integrated.

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