• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Internal combustion engine, in particular a gas engine (10), with a plurality of cylinders (11), wherein a mixture of charge air and a gaseous fuel can be burned in the cylinders (11), with a first turbocharger (12) in which only the charge air (14) can be compressed is, and with a second turbocharger (13), in which only the gaseous fuel (20) is compressible.
    公开号:CH714158A2
    申请号:CH00998/18
    申请日:2018-08-16
    公开日:2019-03-15
    发明作者:Klima Jiri；Drapela Cyril；Vacek Martin
    申请人:Man Energy Solutions Se；
    IPC主号:
    专利说明:

    Description: [0001] The invention relates to an internal combustion engine. Furthermore, the invention relates to a turbocharger for an internal combustion engine and method for operating the internal combustion engine.
    An engine designed as a gas engine or dual-fuel engine has a plurality of cylinders, wherein in the cylinders, a mixture of charge air and a gaseous fuel is burned. In known from practice gas engines or dual-fuel engines, the mixture of charge air and the gaseous fuel upstream of the cylinder of the internal combustion engine is mixed and compressed together via an exhaust gas turbocharger. For the compression of the charge air and the gaseous fuel therefore a common turbocharger is present.
    On this basis, the present invention seeks to provide a novel internal combustion engine, a turbocharger for such an internal combustion engine and method for operating such an internal combustion engine.
    This object is achieved by an internal combustion engine according to claim 1.
    The inventive internal combustion engine has a first turbocharger, in which exclusively the charge air is compressible.
    The inventive internal combustion engine further comprises a second turbocharger, in which exclusively the gaseous fuel is compressible.
    In the inventive internal combustion engine, the charge air is compressed in the first turbocharger and independently thereof, the gaseous fuel in the second turbocharger. This makes it possible to compress charge air and gaseous fuel to individual pressures and make the mixture of charge air and gaseous fuel in the region of a cylinder head of the internal combustion engine.
    According to an advantageous development, the first turbocharger comprises a single compressor stage, wherein the second turbocharger comprises at least two compressor stages. This makes it possible in a particularly advantageous manner to compress the gaseous fuel to a higher pressure than the charge air.
    The inventive turbocharger for such an internal combustion engine, which exclusively serves the compression of the gaseous fuel is defined in claim 4. Such a turbocharger has a particularly compact design. It serves to compress the gaseous fuel, regardless of the compression of the charge air.
    According to an advantageous development extends between the compressor stages of the compressor, a curved flow channel with a first, leading away from the first compressor stage in the radial direction channel section, a second, leading to the second compressor stage in the radial direction channel section and a third, extending between the same, curved channel section , wherein in the second, leading to the second compressor stage in the radial direction channel section guide vanes are arranged. As a result, the gaseous fuel which is precompressed in the first compressor stage can advantageously be supplied to the second compressor stage for further compression.
    According to an advantageous development, cooling channels are introduced into the housing of the compressor, can be cooled by the compressor stages of the compressor. Preferably, further cooling channels are introduced into a bearing housing. The cooling of the compressor and thus the cooling of the compacted by the compressor, gaseous fuel allows a particularly advantageous operation of the internal combustion engine.
    The inventive method for operating an internal combustion engine is defined in claim 9. Because the gaseous fuel is compressed to a higher pressure than the charge air, independently of the charge air, advantageous operation of the internal combustion engine is possible.
    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 is a block diagram of a trained as a gas engine internal combustion engine,
    Fig. 2 is an axial section through a turbocharger of the internal combustion engine.
    The present invention relates to a designed as a gas engine or dual-fuel engine internal combustion engine, a turbocharger for such an internal combustion engine and a method for operating such an internal combustion engine.
    Fig. 1 shows a highly schematic block diagram of an inventive gas engine 10. The gas engine 10 has a plurality of cylinders 11, in which a mixture of charge air and a gaseous fuel is burned. The gas engine 10 has a plurality of turbochargers 12, 13.
    A first turbocharger 12 is used exclusively for the compression of charge air 14. For this purpose, the first turbocharger 12 comprises a compressor 15 for compressing the charge air as well as a turbine 16 for the expansion of exhaust gas 17, which leaves the internal combustion engine. Exhaust 17 is taken from an exhaust manifold 18 and the turbine 16 of the first
    Turbocharger 12 is supplied to be expanded in the turbine 16 of the first turbocharger 12, wherein energy is used here used to compress the charge air 14 in the compressor 15 of the turbocharger 12 and supply a cylinder head 19.
    While the first turbocharger 12 exclusively serves for the compression of charge air, the second turbocharger 13 exclusively serves to compress gaseous fuel 20. For this purpose, the second turbocharger 13 comprises a compressor 21 with a plurality of compressor stages 22, 23. In the exemplary embodiment shown, the compressor comprises 21 of the second turbocharger 13, two compressor stages 22, 23 for compressing the gaseous fuel 20, which can be supplied as a compressed gaseous fuel 20 also the cylinder head 19 to mix the compressed charge air 14 and the compressed gaseous fuel 20 in the region of the cylinder head 19.
    The second turbocharger 13 has a turbine 24, in which also exhaust gas 17 of the cylinder 11 can be expanded to thereby gain energy and using the energy obtained in the relaxation of the exhaust gas 17 in the turbine 24 of the second turbocharger 13 energy To drive the two compressor stages 22,23 of the compressor 21 for compression of the gaseous fuel 20.
    The gas engine 10 according to the invention therefore has turbochargers 12, 13, in which, independently of one another, charge air 14 and, on the other hand, gaseous fuel 20 can be compressed.
    The compressed gaseous fuel 20 and the compressed charge air 14 are first mixed in the region of a cylinder head 19. Characterized in that the second turbocharger 13, which serves to compress the gaseous fuel 20, a higher number of compressor stages than the first turbocharger 12, which serves to compress the charge air 14, the gaseous fuel 20 is compressed to a higher pressure than the charge air 14. As a result, a particularly advantageous, in particular controlled, operation can be ensured for the gas engine 10.
    Fig. 2 shows a cross section through the second turbocharger 13, which serves the compression of the gaseous fuel. Thus, FIG. 2 shows the turbine 24, which comprises a turbine rotor 25 and a turbine housing 26.
    The turbine 24 is preferably designed as a radial turbine, it is preferably flows in the radial direction of the exhaust gas to be relaxed, with relaxed exhaust gas from the turbine rotor 25 preferably flows in the axial direction.
    The compressor 21 comprises a compressor housing 27 with compressor housing sections 27a, 27b and a compressor rotor, which provides the two compressor stages 22, 23. Thus, the first compressor stage 22 comprises a first compressor rotor 28 and the compressor stage 23 comprises a second compressor rotor 29, which are arranged on a common shaft 30. The turbine rotor 25 is coupled via this shaft 30 to the two compressor rotors 28, 29. The shaft 30 is mounted in a bearing housing 31, wherein the bearing housing 31 and is connected in a bearing 35 on the one hand to the turbine housing 26 and on the other hand to the compressor housing 27, in particular to the compressor housing section 27b.
    The two compressor stages 22,23 of the compressor 21 of the turbocharger 13, which exclusively serves for the compression of the gaseous fuel, are both designed as radial compressor stages, the same are accordingly flowed to be compressed, gaseous fuel in the axial direction, the compressed gaseous fuel flows in Radial direction.
    The compressed in the region of the first compressor stage 22 gaseous fuel is supplied via a flow channel 32 of the second compressor stage 29 for further compression.
    This flow channel 32 has a plurality of channel sections 32a, 32b and 32c. A first channel section 32a extends in the radial direction and leads the compressed in the region of the first compressor stage 22, gaseous fuel from the first compressor stage 22 away. The second channel section 32b also extends in the radial direction and guides the compressed in the region of the first compressor stage 22, gaseous fuel toward the second compressor stage 23. Between these two radially extending channel sections 32a, 32b, a third, curved channel section 32c is formed, which deflects the compressed, gaseous fuel by about 180 °.
    In the second channel section 32b after the flow deflection in the region of the third channel section 32c guide vanes 33 are arranged. The guide vanes 33 serve to optimally supply the precompressed, gaseous fuel in the direction of the second compressor stage 23.
    In the housing 27 of the compressor 21 and in the compressor housing sections 27a, 27b and in the bearing housing 31 cooling channels 34 are introduced. About these cooling channels 34, the compressor 21 and the bearing housing 31 can be cooled. Furthermore, cooling of the gaseous fuel is possible.
    The cooling channels in the region of the bearing housing 31 cause a thermal insulation of the hot turbine side. As a result, a particularly advantageous operation of the turbocharger and a gas engine comprising the turbocharger is possible.
    The gas engine 10 is operated so that the gaseous fuel 20 is compressed independently of the charge air 14. In this case, the gaseous fuel 20 is compressed to a higher pressure than the charge air 14.
    These compressed to different pressure levels media, namely the gaseous fuel 20 and the charge air 14 are preferably mixed in the region of the cylinder head 19 or in front of the cylinder head 19, then the mixture of charge air 14 and gaseous fuel 20 the cylinders 11 for combustion supply.
    Although the embodiment has been described for a gas engine, the invention can also be used on a dual-fuel engine.
    [0034] 10 gas engine 11 cylinder 12 turbocharger 13 turbocharger 14 charge air 15 compressor 16 turbine 17 exhaust gas 18 exhaust gas collector 19 cylinder head 20 gaseous fuel 21 compressor 22 compressor stage 23 compressor stage 24 turbine 25 turbine rotor 26 turbine housing 27 compressor housing 27a, 27b compressor housing section 28 compressor rotor 29 compressor rotor 30 Shaft 31 Bearing housing 32 Flow channel 32a Channel section 32b Channel section 32c Channel section 32d Channel section 33 Guide vane 34 Cooling channel
    权利要求:
    Claims (10)
    [1]
    claims
    1. internal combustion engine, in particular gas engine (10), with a plurality of cylinders (11), wherein in the cylinders (11) a mixture of charge air and a gaseous fuel is combustible; characterized by a first turbocharger (12), in which only the charge air (14) is compressible, a second turbocharger (13), in which exclusively the gaseous fuel (20) is compressible.
    [2]
    2. Internal combustion engine according to claim 1, characterized in that the first turbocharger (12) comprises a single Verdicherstufe, the second turbocharger (13) comprises at least two compressor stages (22, 23).
    [3]
    3. Internal combustion engine according to claim 1 or 2, characterized in that the second turbocharger (13) is designed according to one of claims 4 to 8.
    [4]
    4. A turbocharger (13) for an internal combustion engine according to any one of claims 1 to 3, which serves exclusively the compression of the gaseous fuel, characterized in that the same a compressor (21) having a first compressor stage (22) and a first compressor rotor (28) and a second compressor stage (23) and a second compressor rotor (29) having a turbine (24) with a turbine rotor (25), the turbine rotor (25), the first compressor rotor (28) and the second compressor rotor (29) all are coupled via a common shaft (30).
    [5]
    5. A turbocharger according to claim 4, characterized in that the compressor stages (22, 23) of the compressor (21) are radial compressor stages, the turbine (24) is a radial turbine.
    [6]
    6. Turbocharger according to claim 4 or 5, characterized in that between the compressor stages (22, 23) of the compressor (21) has a curved flow channel (32) with a first, of the first compressor stage (22) leading away in the radial direction channel portion (32 a) , a second channel section (32b) leading radially to the second compressor stage (23) and a third curved channel section (32c) extending therebetween, wherein in the second channel section (32b) leading radially to the second compressor stage (23) ) Guide vanes (33) are arranged.
    [7]
    7. Turbocharger according to one of claims 4 to 6, characterized in that in the housing (27) of the compressor (21) cooling channels (34) are introduced, via the compressor stages (22, 23) of the compressor can be cooled.
    [8]
    8. turbocharger according to one of claims 4 to 6, characterized in that in a bearing housing (31) further cooling channels (34) are introduced.
    [9]
    9. A method for operating an internal combustion engine (10) according to one of claims 1 to 3, characterized in that by the second turbocharger (13) of the gaseous fuel (20) is compressed to a higher pressure than the charge air (14) through the first Turbocharger (12).
    [10]
    10. The method according to claim 9, characterized in that the compressed charge air (14) and the independently compressed gaseous fuel (20) in a cylinder head (19) or in front of the cylinder head (19) are mixed.
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102017121322.8A|DE102017121322A1|2017-09-14|2017-09-14|Internal combustion engine, turbocharger for an internal combustion engine and method for operating the internal combustion engine|
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