Method of utilizing waste heat in turbocharger unit of an internal combustion engine and internal combustion engine arrangement

A method of operating an internal combustion engine unit that comprises a turbocharger unit which feeds pressurized combustion air to the engine and receives exhaust gases from the engine, and a steam generator for generating steam by recovering heat from the combustion process, said method comprising:

• using the steam generator to generate steam by recovering waste heat from the engine, and
• injecting steam generated by the steam generator into the turbocharger unit at a high pressure region of a turbine of the turbocharger unit via a steam injection arrangement provided in the turbocharger unit so that mixing of steam with the exhaust gases is minimized and steam energy is recovered in the turbine.

A method of operating an internal combustion engine unit that comprises a turbocharger unit which feeds pressurized combustion air to the engine and receives exhaust gases from the engine, and a steam generator for generating steam by recovering heat from the combustion process, said method comprising:

• using the steam generator to generate steam by recovering waste heat from the engine,
• injecting steam generated by the steam generator into the turbocharger unit via a steam injection arrangement provided in the turbocharger unit, and
• controlling the rate of injection of steam by a closed loop control system that keeps the exhaust gases at a pre-set temperature level.

An internal combustion engine comprising:

• a steam generator for recovering heat from the combustion process,
• a turbocharger unit adapted to feed pressurised combustion air to the engine, the turbocharger unit including a turbine for receiving exhaust gases from the engine and having a high-pressure region, and
• a steam injection arrangement connected with the steam generator, wherein the steam injection arrangement is provided in the high-pressure region of the turbine of the turbocharger unit.

An internal combustion engine comprising:

• a steam generator for recovering heat from the combustion process,
• a turbocharger unit adapted to feed pressurised combustion air to the engine and to receive exhaust gases from the engine, the turbocharger unit including a compressor, and
• a steam injection arrangement connected with the steam generator, wherein the steam injection arrangement is provided in the compressor of the turbocharger unit.