NO20170536A1

NO20170536A1 - Exhaust gas after-treatment system and internal combustion engine

Info

Publication number: NO20170536A1
Application number: NO20170536A
Authority: NO
Inventors: Andreas Döring; Plamen Toshev; Francis Nana
Original assignee: Man Diesel & Turbo Se
Priority date: 2016-03-31
Filing date: 2017-03-31
Publication date: 2017-10-02
Also published as: JP2017187035A; CN107269357A; DE102016205327A1; FI20175254A; CN107269357B; JP6966670B2; KR20170113337A

Description

Exhaust gas after-treatment system and internal combustion engine

The invention relates to an exhaust gas after-treatment system of an internal combustion engine. The invention, furthermore, relates to an internal combustion engine with an exhaust gas after-treatment system.

In combustion processes in stationary internal combustion engines, which are employed for example in power plants, and in combustion processes in non-stationary internal combustion engines, which are employed for example on ships, nitrogen oxides are created, wherein these nitrogen oxides are typically created during the combustion of sulphur-containing, fossil fuels such as coal, pit coal, crude oil, heavy fuel oil or diesel fuels. For this reason, such internal combustion engines are assigned exhaust gas after-treatment systems which serve for the cleaning, in particular denitrification of the exhaust gas leaving the internal combustion engine.

For reducing nitrogen oxides in the exhaust gas, so-called SCR catalytic converters are primarily employed in exhaust gas after-treatment systems known from practice. In an SCR catalytic converter, a selective catalytic reduction of nitrogen oxides takes place, wherein for the reduction of the nitrogen oxides ammonia (NH3) as reduction agent is required. The ammonia or an ammonia precursor substance, such as for example urea, is introduced for this purpose into the exhaust gas in liquid form upstream of the SCR catalytic converter, wherein the ammonia or the ammonia precursor substance is mixed with the exhaust gas upstream of the SCR catalytic converter. To this end, mixing sections between the introduction of the ammonia or of the ammonia precursor substance and the SCR catalytic converter are provided according to practice.

Although with exhaust gas after-treatment systems known from practice, which comprise an SCR catalytic converter, an exhaust gas after-treatment, in particular a nitrogen oxide reduction, can already successfully take place, there is a need for further improving the exhaust gas after-treatment systems. There is in particular a need for making possible an effective exhaust gas after-treatment with a compact design of such exhaust gas after-treatment systems.

Starting out from this, the object of the present invention is based on creating a new type of exhaust gas after-treatment system of an internal combustion engine and an internal combustion engine with such an exhaust gas after-treatment system.

This object is solved through an exhaust gas after-treatment system of an internal combustion engine according to Claim 1. The exhaust gas after-treatment system according to the invention, comprises a heat exchanger, with the help of which thermal energy of the exhaust gas can be transferred from the exhaust gas downstream of the SCR catalytic converter to the exhaust gas upstream of the SCR catalytic converter. By way of the heat exchanger, the exhaust gas temperature can be set to a level that is optimal for the SCR treatment. Thermal energy, which is liberated during the exothermic reaction of the SCR treatment and is present in the exhaust gas downstream of the SCR catalytic converter is transferred to the exhaust gas upstream of the SCR catalytic converter. Because of this, an effective exhaust gas after-treatment is possible by increasing the temperature upstream of the SCR catalytic converter.

According to an advantageous further development of the present invention, the exhaust gas feed line and the exhaust gas discharge line are connected on a common side of the reactor chamber, wherein one of these exhaust gas lines surrounds the other one of the exhaust gas lines surrounds the other one of these exhaust gas lines in sections forming the heat exchanger. This further development allows an effective exhaust gas after-treatment with a compact and simple design of an exhaust gas after-treatment system.

Preferentially, the exhaust gas discharge line surrounds the exhaust gas feed line adjacent to the side of the reactor chamber on which both exhaust gas lines are connected in sections on the outside, wherein a section of the exhaust gas feed line, about which, seen in flow direction of the exhaust gas feed line, exhaust gas is circulated upstream of the SCR catalytic converter, is surrounded on the one hand by the exhaust gas discharge line and on the other hand runs within the reactor chamber. This further development allows an effective exhaust gas after-treatment with a particularly compact and simple design of an exhaust gas after-treatment system. In particular, deposits on walls of the exhaust gas feed line can be avoided.

According to an advantageous further development of the present invention, a ratio between a length of the SCR catalytic converter and a length of a section of the exhaust gas feed line, about which exhaust gas circulates upstream of the SCR catalytic converter, amounts to at least 1:5, preferably at least 1:8, particularly preferably at least 1:10. This further development allows an effective exhaust gas after-treatment with a particularly simple and compact design of an exhaust gas after-treatment system.

A further improvement consists in increasing the heat transfer by increasing the pressure level of the exhaust gas. Advantageously, the absolute pressure is increased to at least 0.2 MPa, advantageously to at least 0.3 MPa, most advantageously to at least 0.4 MPa. In order to be able to omit separate compressors for increasing the exhaust gas pressure, it is appropriate to arrange the heat exchanger and thus also the SCR reactor upstream of at least one exhaust gas turbine.

The internal combustion engine according to the invention is defined in Claim 10.

Preferred further developments of the invention are obtained from the subclaims and the following description. Exemplary embodiments of the invention are explained in more detail by way of the following without being restricted to this. There it shows: Fig. 1: a schematic, perspective view of an internal combustion engine with an exhaust gas after-treatment system according to the invention;

Fig. 2: a detail of the exhaust gas after-treatment system of Fig. 1.

The present invention relates to an exhaust gas after-treatment system of an internal combustion engine, for example of a stationary internal combustion engine in a power plant or in a non-stationary internal combustion engine employed on a ship. In particular, the exhaust gas after-treatment system is employed on a diesel engine of a ship operated with heavy fuel oil.

Fig. 1 shows an arrangement of an exhaust gas supercharged internal combustion engine 1 with an exhaust gas turbocharger system 2 and an exhaust gas after-treatment system 3. The internal combustion engine 1 can be a non-stationary or stationary internal combustion engine, in particular a non-stationarily operated internal combustion engine of a ship. Exhaust gas, which leaves the cylinders of the internal combustion engine 1, is utilised in the exhaust gas supercharging system 2, in order to extract mechanical energy from the thermal energy of the exhaust gas for compressing charge air to be fed to the internal combustion engine 1.

Accordingly, Fig. 1 shows an internal combustion engine 1 with an exhaust gas turbocharger system 2, which comprises a plurality of exhaust gas turbochargers, namely a first exhaust gas turbocharger 4 on the high-pressure side and a second exhaust gas turbocharger 5 on the low-pressure side. Exhaust gas which leaves the cylinders of the internal combustion engine 1 initially flows via a high-pressure turbine 6 of the first exhaust gas turbocharger 1 and is expanded in the same, wherein energy extracted in the process is utilised in a high-pressure compressor of the first exhaust gas turbocharger 4 in order to compress charge air. Seen in flow direction of the exhaust gas downstream of the first turbocharger 4 the second exhaust gas turbocharger 5 is arranged, via which exhaust gas, which has already flowed through the high-pressure turbine 6 of the first exhaust gas turbocharger 4, is conducted, namely via a low-pressure turbine 7 of the second exhaust gas turbocharger 5. In the low-pressure turbine 7 of the second exhaust gas turbocharger 5 the exhaust gas is further expanded and energy extracted in the process utilised in a low-pressure compressor of the second exhaust gas turbocharger 5 in order to likewise compress the charge air to be fed to the cylinders of the internal combustion engine 1.

In addition to the exhaust gas supercharging system 2 comprising the exhaust gas turbochargers 4 and 5, the internal combustion engine 1 comprises the exhaust gas after-treatment system 3, which is an SCR exhaust gas after-treatment system. The SCR exhaust gas after-treatment system 3 is connected between the high-pressure turbine 6 of the first compressor 5 and the low-pressure turbine 7 , so that exhaust gas, which leaves the high-pressure turbine 6 of the first exhaust gas turbocharger 4, can be initially conducted via the SCR exhaust gas after-treatment system 3 before the same reaches the region of the low-pressure turbine 7 of the second exhaust gas turbocharger 5. Because of this, the heat exchanger is operated with an elevated pressure level, as a result of which the heat transfer is improved. Fig. 1 shows an exhaust gas feed line 8, via which exhaust gas, emanating from the high-pressure turbine 6 of the first exhaust gas turbocharger 4 can be conducted in the direction of an SCR catalytic converter 9,(see Fig. 2) which is arranged in a reactor chamber 10. Fig. 1, furthermore, shows an exhaust gas discharge line 11, which serves for discharging the exhaust gas from the SCR catalytic converter 9 in the direction of the low-pressure turbine 7 of the second exhaust gas turbocharger 5.

Emanating from the low-pressure turbine 7, the exhaust gas flows via a line 21 in particular into the open.

The exhaust gas feed line 8 leading to the reactor chamber 10 and thus to the SCR catalytic converter 9 positioned in the reactor chamber 10 and the exhaust gas discharge line 11 leading away from the reactor chamber 10 and thus from the SCR catalytic converter 9 are coupled via a bypass 12 in which a shut-off element 13 is integrated. With closed shut-off element 13, the bypass 12 is closed so that no exhaust gas can flow via the same. By contrast, in particular when the shut-off element 13 is opened, exhaust gas can flow via the bypass 12, namely past the reactor chamber 10 and accordingly past the SCR catalytic converter 9 positioned in the reactor chamber 10.

Fig. 2 illustrates with arrows 14 the flow of the exhaust gas through the exhaust gas after-treatment system 3 with the bypass 12 closed via the shut-off element 13, wherein it is evident from Fig. 2 that the exhaust gas feed line 8 opens into the reactor chamber 10 with a downstream end 15, wherein the exhaust gas in the region of this end 15 of the exhaust gas feed line 8 is subjected to a flow deflection about approximately 180°, wherein the exhaust gas after the flow deflection is conducted via the SCR catalytic converter 9.

The exhaust gas feed line 8 of the exhaust gas after-treatment system 3 is as-signed an introduction device 16, via which in the exhaust gas flow a reduction agent can be introduced, in particular ammonia or an ammonia precursor substance, which is required in order to convert nitrogen oxides of the exhaust gas in the region of the SCR catalytic converter 9 in a defined manner. This introduction device 16 of the exhaust gas after-treatment system 3 is preferentially an injection nozzle, via which the ammonia or the ammonia precursor substance is injected in to the exhaust gas flow within the exhaust gas feed line 8. Fig. 2 illustrates with a cone 17 the injection of the reduction agent into the exhaust gas in the region of the exhaust gas feed line 8. The section of the exhaust gas after-treatment system 3, which seen in flow direction of the exhaust gas is located downstream of the introduction device 16 and upstream of the SCR catalytic converter 9, is described as mixing section. In particular, the exhaust gas feed line 8 provides a mixing section 18 downstream of the introduction device 16, in which the exhaust gas can be mixed with the reduction agent upstream of the SCR catalytic converter 9.

The exhaust gas feed line 8 opens with the downstream end 15 into the reactor chamber 10. This downstream end 15 of the exhaust gas feed line 8 is assigned a baffle element 20, which can be displaced relative to the downstream end 15 of the exhaust gas feed line 8. In the shown exemplary embodiment, the baffle element 20 can be linearly displaced relative to the end 15 of the exhaust gas feed line 8, which opens into the reactor chamber 10.

The baffle element 20 can be displaced relative to the downstream end 15 of the exhaust gas feed line 8 in order to either shut off the exhaust gas feed line 8 at the downstream end 15 or open the same at the downstream end 15. In particular when the baffle element 20 shuts off the exhaust gas feed line 8 at the downstream end 15, the shut-off element 13 of the bypass 12 is preferentially opened in order to then conduct the exhaust gas completely past the SCR catalytic converter 9 or the reactor chamber 10 receiving the SCR catalytic converter 9.

In particular when the baffle element 20 opens the downstream end 15 of the exhaust gas feed line 8, the shut-off element 13 of the bypass 12 can either be completely closed or at least partially opened. In particular when the baffle element 20 opens the downstream end 15 of the exhaust gas feed line 8, the relative position of the baffle element 20 relative to the downstream end 15 of the exhaust gas feed line 8 is dependent in particular on the exhaust gas mass flow through the exhaust gas feed line 8 and/or on the exhaust gas temperature of the exhaust gas in the exhaust gas feed line 8 and/or on the quantity of the reduction agent introduced into the exhaust gas flow via the introduction device 16.

A further function of the baffle element 20 with opened downstream end 15 of the exhaust gas feed line 8 consists in that any droplets of liquid reduction agent present in the exhaust gas flow reach the baffle element where they are intercepted and atomised in order to avoid that such drops of liquid reduction agent reach the region of the SCR catalytic converter 9. By way of the relative position of the baffle element 20 relative to the downstream end 15 of the exhaust gas feed line 8 with opened downstream end 15 it can be determined in particular whether the exhaust gas, which is deflected in the region of the downstream end 15 of the exhaust gas feed line 8 in the region of the baffle element 20, is conducted or steered more in the direction of sections positioned radially inside or more in the direction of sections of the SCR catalytic converter 9 positioned radially outside.

According to a preferred embodiment, the exhaust gas feed line 8 is expanded funnel-like in the region of the downstream end 15 forming a diffuser. Because of this, the flow cross section of the exhaust gas feed line 8 increases in the region of the downstream end 15, wherein, as is evident in particular from Fig. 2, it can be provided that seen in flow direction of the exhaust gas upstream of the downstream end 15 of the exhaust gas feed line 8 the flow cross section of the same initially diminishes. Accordingly, Fig. 2 shows that the flow cross section of the exhaust gas feed line 8 seen in flow direction of the exhaust gas downstream of the introduction device 16 for the reduction agent is initially approximately constant, but then initially tapers gradually and finally expands in the region of the downstream end 15. This expansion of the flow cross section at the downstream end 15 of the exhaust gas feed line 8 in this case is preferentially effected via a shorter section of the exhaust gas feed line 8 than that section via which the exhaust gas feed line 8 initially tapers in front of the downstream end 15. In that axial position of the exhaust gas feed line 8, in which the flow direction of the same initially ta pers gradually, the SCR catalytic converter 9 is arranged radially outside of the exhaust gas feed line 8.

Preferentially, the baffle element 20 is curved, preferentially bell-like curved on a side 22 facing the exhaust gas feed line 8 forming a flow guide for the exhaust gas. The side of the baffle element 20, which faces the downstream end 15 of the exhaust gas feed line 8, has a smaller distance on a radially inner section of the baffle element 20 to the downstream end 15 of the exhaust gas feed line 8 than on a radially outer section of the same. Accordingly, the baffle element 20 is drawn in or curved in the centre in the direction of the downstream end 15 of the exhaust gas feed line 8 against the flow direction of the exhaust gas.

As is evident in particular from Fig. 2, the exhaust gas feed line 8 and the exhaust gas discharge line 11 are jointly connected on a first side 24 of the reactor chamber 10 or open or extend into the reactor chamber 10 originating from this common side 24.

Here, the exhaust gas feed line 8 extends into the reactor chamber 10 in such a manner that the downstream end 15 of the exhaust gas feed line 8 is positioned adjacent to a second side 23 of the reactor chamber 10 located opposite the first side 24 of the reactor chamber 10, whereas the exhaust gas discharge line 11 opens into the reactor chamber 10 on the first side 24. Accordingly, exhaust gas fed in via the exhaust gas feed line 8 is deflected by approximately 180° in the region of the second side 23 of the reactor chamber 10, which is located opposite the downstream end 15 of the exhaust gas feed line 8, then flows via the SCR catalytic converter 9 and subsequently via the second 24 into the region of the exhaust gas discharge line 11. Between the first side 24 of the reactor chamber 10 and the second side 23 of the reactor chamber 10 located opposite, a wall 19 of the reactor chamber 10 which is preferentially round in cross section extends According to the invention, the exhaust gas after-treatment system 3 comprises a heat exchanger 25 with the help of which thermal energy of the exhaust gas can be transferred from the exhaust gas downstream of the SCR catalytic converter 9 to the exhaust gas upstream of the SCR catalytic converter 9. Thermal energy, which is liberated during the exothermic reaction of the SCR treatment and is present in the exhaust gas downstream of the SCR catalytic converter 9 is transferred to the exhaust gas upstream of the SCR catalytic converter 9. Because of this, the exhaust gas temperature can be set to a level that is optimal for the SCR treatment and an effective exhaust gas after-treatment made possible.

The exhaust gas feed line 8 and the exhaust gas discharge line 11 are connected jointly on the first side 24 of the reactor chamber 10, wherein one of these exhaust gas lines 8, 11 surrounds the other one of these exhaust gas lines 8, 11 in sections forming the heat exchanger 25. In the shown preferred exemplary embodiment, the exhaust gas discharge line 11 surrounds the exhaust gas feed line 8 adjacent to the first side 24 of the reactor chamber 10, on which both exhaust gas lines 8, 11 are connected, in section on the outside, preferentially concentrically.

Because of this, the thermal energy, which is present in the exhaust gas downstream of the SCR catalytic converter, can be reliably transferred to the exhaust gas upstream of the SCR catalytic converter 9 with a compact and simple design of the exhaust gas after-treatment system 3. There is no danger that deposits form in the region of the exhaust gas feed line 8.

The exhaust gas discharge line 11 surrounds the exhaust gas feed line 8 in the region of the mixing section 18. A section of the exhaust gas feed line 8, which is surrounded by a section of the exhaust gas discharge line 11, is positioned seen in flow direction of the exhaust gas feed line 8 downstream of the introduction device 16 for introducing the reduction agent into the exhaust gas and accordingly in the region of the mixing section18.

A ratio between a length 11 of the SCR catalytic converter 9 seen in an exhaust gas flow direction and a length 12 of a section of the exhaust gas feed line 8, about which exhaust gas circulates upstream of the SCR catalytic converter 9, amounts to at least 1:5, preferably at least 1:8, particularly preferably at least 1:10. Because of this, the thermal energy, which is present in the exhaust gas downstream of the SCR catalytic converter 9, can be reliably transferred to the exhaust gas upstream of the SCR catalytic converter 9.

The section of the exhaust gas feed line 8, about which exhaust gas circulates upstream of the SCR catalytic converter 9, is surrounded on the one hand by the exhaust gas discharge line 11 and on the other hand runs within the reactor chamber 10. The length 12 of that section of the exhaust gas feed line 8, about which exhaust gas circulates upstream of the SCR catalytic converter, accordingly is composed of a part section length 121 surrounded by the exhaust gas discharge line 11 and a part section length I22 running with the reactor chamber 10.

The reactor chamber 10 and/or the exhaust gas discharge line 11 and/or the exhaust gas feed line 8 are contoured in such a manner that seen in flow direction of the exhaust gas a flow cross section for the exhaust gas tapers downstream of the SCR catalytic converter 9. This is ensured in the exemplary embodiment by a conical contouring of the first side 24 of the catalytic converter 10. Through this tapering of the flow cross section, a defined flow velocity is adjusted in the section of the exhaust gas discharge line 11, which surrounds the exhaust gas feed line 8 on the outside forming the heat exchanger 25, in order to transfer particularly effective transfer of the thermal energy, which is present in the exhaust gas downstream of the SCR catalytic converter, to the exhaust gas upstream of the SCR catalytic converter 9.

In the case of the internal combustion engine 1 of Fig. 1, the exhaust gas after-treatment system 3 is positioned upright upstream of the exhaust gas supercharging system 2. Access to the cylinders of the internal combustion engine 1 is free, accessibility of the exhaust gas turbochargers 4 and 5 however is restricted. When maintenance operations become necessary on the turbochargers 4, 6, the reactor chamber 10 however can be simply disassembled. In contrast with the upright arrangement of the exhaust gas after-treatment system 3 upstream of the exhaust gas supercharging system 2 shown in Fig. 1, a horizontal arrangement tilted by 90° of the exhaust gas after-treatment system 3 next to the exhaust gas supercharging system 2 is also possible, wherein however with such a horizontal arrangement the length of the arrangement grows. Internal combustion engine 1 and exhaust gas supercharging system 2 however are then available without restrictions for maintenance work without the need for disassembling the reactor chamber 10.

Particularly preferably, the invention is employed with two-stage supercharged four-stroke engines or with two-stroke engines, in the case of which the exhaust gas temperature upstream of the SCR catalytic converter is less than 300°C. In such engines, the exhaust gas temperature can be adjusted with the invention to a level that is optimal for the SCR treatment.

List of reference numbers 1 Internal combustion engine 2 Exhaust gas supercharging system 3 Exhaust gas after-treatment system

4 Exhaust gas turbocharger

5 Exhaust gas turbocharger

6 High-pressure turbine

7 Low-pressure turbine

8 Exhaust gas feed line

9 SCR catalytic converter

10 Reactor chamber

11 Exhaust gas discharge line

12 Bypass

13 Shut-off element

14 Exhaust gas guide

15 End

16 Introduction device

17 Injection cone

18 Mixing section

19 Wall

20 Baffle element

21 Line

22 Side

23 Side

24 Side

25 Heat exchanger

Claims

1. An exhaust gas after-treatment system (3) of an internal combustion engine, namely SCR exhaust gas after-treatment system of an internal combustion engine, with an SCR catalytic converter (9) received in a reactor chamber (10), with an exhaust gas feed line (8) leading to the reactor chamber (10) and thus to the SCR catalytic converter (9) and with an exhaust gas discharge line (11) leading away from the reactor chamber (10) and thus from the SCR catalytic converter (9) with an introduction device (16) assigned to the exhaust gas feed line (8) for introducing a reduction agent, in particular ammonia or an ammonia precursor substance, into the exhaust gas, and with a mixing section (8) provided by the exhaust gas feed line (8) downstream of the introduction device (16) for mixing the exhaust gas with the reduction agent upstream of the reactor chamber (10) or SCR catalytic converter (9),characterized in thatwithin the reactor chamber (10) at least one blow-down device (24) is positioned, which serves for purging the SCR catalytic converter (9).

2. The exhaust gas after-treatment system according to Claim 1,characterized inthat the pressure in the heat exchanger amounts to at least 0.2 MPa, advantageously at least 0.3 MPa, most advantageously 0.4 MPa absolute.

3. The exhaust gas after-treatment system according to Claim 1 or 2,characterized in thatthe heat exchanger is arranged upstream of at least one turbine of an exhaust gas supercharged combustion engine.

4. The exhaust gas after-treatment system according to Claim 1,characterized inthat the exhaust gas feed line (8) and the exhaust gas discharge line (11) are jointly connected on a side (24) of the reactor chamber (10), wherein one of these exhaust gas lines surrounds the other one of these exhaust gas lines in sections forming the heat exchanger (25).

5. The exhaust gas after-treatment system according to Claim 2,characterized inthat the exhaust gas discharge line (11) surrounds the exhaust gas feed line (8) adjacent to the side (24) of the reactor chamber (10), on which both exhaust gas lines (8, 11) are connected on the outside in sections.

6. The exhaust gas after-treatment system according to Claim 5,characterized inthat the exhaust gas discharge line (11) concentrically surrounds the exhaust gas feed line (8) in sections.

7. The exhaust gas after-treatment system according to Claim 5 or 6,characterized in thatthe exhaust gas discharge line (11) surrounds the exhaust gas feed line (8) in the region of the mixing section (18) on the outside.

8. The exhaust gas after-treatment system according to any one of the Claims 5 to 7,characterized in thata section of the exhaust gas feed line (8), which is surrounded by a section of the exhaust gas discharge line (11), is positioned, seen in flow direction of the exhaust gas feed line (8) downstream of the introduction device (16) for introducing the reduction agent into the exhaust gas.

9. The exhaust gas after-treatment system according to any one of the Claims 5 to 8,characterized in thata ratio between the length of the SCR catalytic converter (9) and a length of a section of the exhaust gas feed line (8), about which exhaust gas circulates upstream of the SCR catalytic converter (9), amounts to at least 1:5, preferably at least 1:8, most preferably at least 1:10.

10. The exhaust gas after-treatment system according to any one of the Claims 5 to 9,characterized in thata section of the exhaust gas feed line (8), about which exhaust gas circulates upstream of the SCR catalytic converter (9), is surrounded on the one hand by the exhaust gas discharge line (11) and on the other hand runs within the reactor chamber (10).

11. The exhaust gas after-treatment system according to any one of the Claims 5 to 10,characterized in thatthe reactor chamber (10) and/or the exhaust gas discharge line (11) and/or the exhaust gas feed line (8) are contoured in such a manner that seen in flow direction of the exhaust gas a flow cross section for the exhaust gas downstream of the SCR catalytic converter (9) tapers.

12. An internal combustion engine (1), in particular internal combustion engine operated with a diesel fuel or with a heavy fuel oil fuel, with an exhaust gas after-treatment system (3) according to any one of the Claims 1 to 11.

13. The internal combustion engine according to Claim 12,characterized in thatthe same comprises an exhaust gas supercharging system (2) with at least one exhaust gas turbocharger (4), wherein the exhaust gas after system (3) is connected between cylinders of the internal combustion engine and the exhaust gas supercharging system (2).

14. The internal combustion engine according to Claim 12,characterized in thatthe same comprises a multi-stage exhaust gas supercharging system (2) with a first exhaust gas turbocharger (4) comprising a high-pressure turbine (6) and a second exhaust gas turbocharger (5) comprising a low-pressure turbine (7), wherein the exhaust gas after-treatment system (3) connected between the high-pressure turbine (6) and the low-pressure turbine (7).