Deep recycling heat from exhaust gases and compressed air of modern low speed engine

Abstract

The energy flows in the propulsion plant with low-speed engine MAN 14S90ME–C9.2–TII are considered. It is noted that only one quarter of the energy released by combustion of fuel in the engine cylinder is transformed in propeller thrust. The amount of heat from the charge air slightly exceeds the amount of heat from exhaust gases when the engine’s load is 90% and under ISO conditions. The thermal scheme of exhaust heat recovery and air charging system at reasonable for marine conditions cooling depth has been presented and analyzed. Operating parameters of the system are shown in the diagram «Temperature — Heat». In the diagram «enthalpy — entropy» there has been considered a steam expansion process occurring in the turbine with two transitional supplies of superheated steam. It is indicated that all primary superheat pressure is needed to avoid excessive humidity of steam at the end of the expansion process.