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This paper made a comprehensive allocation of waste heat from W7X82DF model low-speed two-stroke marine Dual-Fuel engine regarded to its exhaust gas and jacket water waste heat and energy grade, and developed a combined organic Rankine cycle (ORC) system which can effectively utilize the cold energy of liquefied nature gas (LNG) and the waste heat of dual-fuel marine engine. Apart from that, we take the actual situation of heat transfer temperature difference into full consideration, and performance of twelve low-carbon green refrigerants with the situation that the value of ozone dissipation potential equal to 0 and global warming potential is less than 150. Through the closed circuit of the exhaust gas conversion device, the waste heat of the exhaust gas is driven to high-temperature cycle. Due to the advantages of large and stable flow of jacket water, and constant inlet and outlet temperature, it can be used as the heat source of low-temperature cycle to recover the waste heat of jacket water. The process simulation software Aspen Plus was used to build the cycle, and the P-R equation physical property method was selected. According to the simulation curve, the following conclusions are drawn: R600a is more suitable as working medium of High-temperature cycle, thermal efficiency and net output power are 10.43% and 399.061 kW; The R600 is more suitable as the working medium of Low-temperature cycle, with the thermal efficiency and net power output of 12.88% and 340.13 kW respectively. Through the research in this paper, it provides a reference for the waste heat recovery of marine engine and improves fuel utilization and economy.

Study on Working Medium Selection of High and Low Temperature Coupled ORC Scheme for Waste Heat Recovery of Dual-Fuel Ship Engine Huaiqiang Chen, Zhe Wang*, Yuemao Jiang, Shui Yu, Fenghui Han, Yulong Ji @Dalian Maritime University