Research On The Modeling And Simulation Of 8K90MC-C Diesel Engine Exhaust Gas Power Generation System With The Power Turbine Fed In Series Based On Simulink

With the decrease of global oil resources and environmental deterioration, Energy conservation and emission reduction has become a hot topic which human concerned. In the shipping fields, since 2007 when Marine Environment Protection Committee (MEPC) launched the Energy Efficiency Design Index (EEDI) for new ships, marine diesel engine exhaust heat recovery technology has been paid more and more attention by all parties, especially to the exhaust gas power generation technology which is the key research direction of the world's leading diesel engine companies.In this paper, the simulation models of 8K90MC-C diesel engine system and exhaust gas power generation system which is based on the 8K90MC-C diesel engine and with the power turbine fed in series are built using the Simulink software. And the diesel engine system model is simulated firstly so as to ensure this model is correct. And then, the exhaust gas power generation system model is simulated.The simulation results indicate that the power turbine generator should be bypassed when the diesel engine load is less than 55%, because of its low effective power. And only when the diesel engine load is more than 55%, this exhaust gas power generation device could put into operation, and its maximum effective power increases with the increase of diesel engine load. At the same time the total effective fuel oil consumption of this system will decrease, and its total thermal efficiency will increase.In a word, the ideas and methods described in this paper could provide a reference for the research on other kind of exhaust gas power generation system, and the simulation results we get from this paper also could provide a reference for the selection of exhaust gas power generation system on board.