Study On Modulation And Waste Heat Recover Of Marine Two-stroke Diesel Engine

Currently,the thermal efficiency of marine low-speed two-stroke diesel engine up to 50%,But there’s still nearly half of the energy is not transformed to useful power. If recycle it possible to further improve the thermal efficiency, And relative to the reduction of pollutant emissions. In this paper,we take MAN 6S50ME diesel engine as the research object. studied on the use of power turbines, conventional Rankine cycle and organic Rankine cycle United device for recycling waste heat of diesel engine and host modulation and other issues. The main works include:First, use the design parameters to calculate thermal balance of the diesel engine,Analysis the size and whereabouts of every parts of the energy, Comparative and analysis the necessity to improve the engine exhaust gas temperature by modulating the host in order to improve the entire waste heat whicth can be recovered of power system;Secondly,use the internal combustion engine process simulation software, combining experimental data,take MAN 6S50MEC8.2 as the object of this paper, Comparative and analysis the thermal performance of both standard host and WHR host, discussed the key issues of the host modulation; On this basis , calculate and analysis the design of the project,for the purpose of improve the overall efficiency of the recovery system, Presents an optimization program, calculation and analysis its thermodynamic;Finally, designed and calculated the two heat exchangers of the optimization scheme,Determine its main structure parameters.This paper has laid a foundation to deepen the study of the subject, and provide reference to improve the entire system.