Thi Minh Hao Dong, Xuan Phuong Nguyen


Nowadays, the use of exhaust gas energy seems to be a very promising key to increase the energy efficiency in maritime
field by converting the thermal losses of ship into useful energy sources such as exhaust boiler, exhaust turbo charging
or mini electrical generator, which ensure the best utilization of the fuel, reduce emission met IMO requirements and
reduce the operating costs. Diesel engine exhaust gas energy, certainly the most interesting among the waste heat
sources of a ship because of the heat flow and temperature, is always considered to utilize due to the exhaust gas energy
is approximately 25-30% of total energy of burned fuels in internal combustion engines. By installing the main
propulsion plant with a waste heat recovery system (WHRS), the fuel can be utilized more economically, because energy
lost in the exhaust gas flow is less. Moreover, the amount of CO2 emissions related to the mechanical power output of
engines may be dropped off. The paper presents the review of utilization of exhaust gas heat in ship and suggests a
heating up method for biodiesel or bio-oils which fuel in diesel engine in order to get dual benefit.

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