Abstract
Abstract In this paper, simulation works for a cascade refrigeration cycle using propane, ethylene and methane as a refrigerant have been performed for the liquefaction of natural gas using Peng-Robinson equation of state built-in PRO/II with PROVISION release 8.3. The natural gas feed compositions were supplied from Korea Gas Corporation and the flow rate was assumed to be 5.0 million tons per annual. Supply temperature for propane refrigerant was fixed as -40 o C, that for ethylene refrigerant as -95 o C, and that for methane refrigerant as -155 o C. Natural gas was finally cooled and liquefied to -162 o C by Joule-Thomson expansion. Conclusively, 91.64% by mole of the natural gas liquefaction ratio was obtained through a cascade refrigeration cycle and Joule-Thomson expansion. Key Words : Cascade refrigeration, Peng-Robinson equation of state, Refrigerant, liquefied natural gas 본 연구는 국토해양부 LNG플랜트사업단의 연구비지원에 의해 수행되었습니다. * 교신저자 : 조정호(jhcho@kongju.ac.kr)접수일 10년 11월 30일 수정일 (1차 10년 12월 23일, 2차 10년 12월 30일) 게재확정일 11년 01월 13일
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