Reciprocating piston engine, esp. 2-stroke heavy Diesel engines has exhaust gas re-circulation device with turbine charged by drive air branched-off charging air compressed by exhaust turbocharger

摘要

The engine has an exhaust gas re-circulation device (16) with compressor (20), which is driven by a turbine (19). The turbine is charged with drive air, which is a part volume branched off the charging air compressed by the exhaust turbocharger (7), and is heated by the re-circulated part exhaust volume, while cooling it at the same time. The re-circulation device has a low-pressure turbo compressor (18), which contains the turbine and the compressor. It also has a rotary heat exchanger (22) connected to the turbo compressor, which in turn has an electrical auxiliary motor.