OPTIMIZATION OF KCS-DORC SYSTEM BASED ON LNG COLD ENERGY AND FUEL CELL WASTE HEAT

Chen Xuyang; Yang Fan; Li Pengfei; Hai Xiao; Gao Yue; Jiang Wenquan

doi:10.19912/j.0254-0096.tynxb.2024-1143

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (12) : 152-160. DOI: 10.19912/j.0254-0096.tynxb.2024-1143

OPTIMIZATION OF KCS-DORC SYSTEM BASED ON LNG COLD ENERGY AND FUEL CELL WASTE HEAT

Chen Xuyang¹, Yang Fan², Li Pengfei², Hai Xiao², Gao Yue², Jiang Wenquan¹

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Abstract

Aiming at the problems of waste heat recovery in solid fuel cells using natural gas as fuel and the utilization of cold energy in liquefied natural gas, a combined power cycle of ammonia-water power cycle and two-stage organic Rankine was proposed. The thermo-economic performance of hexane and its mixture was analyzed by the calculation method of numerical simulation. The effects of TUR4 inlet pressure p₁₈, R1270 mass flow rate q_m,11 and TUR1 inlet temperature t₂₆ on system was also analyzed, followed by system optimization. The results show that the overall performance of Case 2 is superior to Case 1 in the high-temperature grade organic Rankine cycle, and the net output power is maximum at hexane/R600 mass fraction of （0.2/0.8）. Increasing p₁₈, q_m,11 and t₂₆ enhances net power output and thermal efficiency, while elevating p₁₈ improves exergy efficiency but compromises economic performance. Matlab optimization results are 3731.72 kW, 41.95% and 2.751×10^-2 $/kWh. The system depreciation payback period and cold storage cooling factor are 4.94 years and 0.233 respectively.

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organic Rankine cycle / waste heat recovery / cold energy utilization / thermal economy / multi objective optimization / ammonia-water power cycle

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Chen Xuyang, Yang Fan, Li Pengfei, Hai Xiao, Gao Yue, Jiang Wenquan. OPTIMIZATION OF KCS-DORC SYSTEM BASED ON LNG COLD ENERGY AND FUEL CELL WASTE HEAT[J]. Acta Energiae Solaris Sinica. 2025, 46(12): 152-160 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1143

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