LNG FPSO에 적용가능한 신액화 사이클의 효율 및 엑서지 분석

Abstract

Abstract: This paper presents the new cascade liquefaction cycles using CO 2 -C 2 H 6 -N 2 and CO 2 -N 2 . The performance and exergy of cascade liquefaction cycles are analyzed using HYSYS software and then confirmed the possibility of these cycles for LNG-FPSO ship. From the comparison of performance and exergy loss of these cycles, the cascade liquefaction cycles using CO 2 -C 2 H 6 -N 2 showed higher performanceand the cycle using CO 2 -N 2 presented higher exergy loss. The cascade liquefaction cycle using CO 2 -N 2 is lower efficiency and higher compressor work compared to the optimized cascade liquefaction cycle using C 3 H 8 -C 2 H 4 -C 1 H 4 . But, if the efficiency of N 2 cycle in these liquefaction cycles is improved, it is possible toapply the cascade liquefaction cycle using CO 2 -C 2 H 6 -N 2 and CO 2 -N 2 to LNG-FPSO ship due to the simplecomposition device of these cycles. Key words: LNG-FPSO ship, Exergy, Compressor work, Liquefaction process of natural gas, Cascade refrigeration cycle