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A Simulation Study on the Cascade Refrigeration Cycle for the Liquefaction of the Natural Gas [2]: An Application to the Multistage Cascade Refrigeration Cycle

천연가스 액화를 위한 캐스케이드 냉동사이클의 전산모사에 대한 연구 [2]: 다단 캐스케이드 냉동 사이클에 적용

  • Cho, Jung-Ho (Department of Chemical Engineering, Kongju National University) ;
  • Kim, Yu-Mi (Department of Chemical Engineering, Kongju National University)
  • Received : 2011.01.03
  • Accepted : 2011.02.10
  • Published : 2011.02.28

Abstract

In this paper, simulation works for a multi-stage cascade refrigeration cycle using propane, ethylene and methane as refrigerants 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 $-40^{\circ}C$, that for ethylene refrigerant as $-95^{\circ}C$, and that for methane refrigerant as $-155^{\circ}C$. For the multi-stage refrigeration cycle, three-stage refrigeration was assumed for propane refrigeration cycle, two-stage refrigeration for ethylene refrigeration cycle and three-stage refrigeration for methane refrigeration cycle. Natural gas was finally cooled and liquefied to $-162^{\circ}C$ by Joule-Thomson expansion. Conclusively, 91.71% by mole of the natural gas liquefaction ratio was obtained through a cascade refrigeration cycle and Joule-Thomson expansion and 0.433 kW of compression power was consumed for the liquefaction of 1.0 kg/hr of natural gas.

Keywords

Multi-stage refrigeration;Cascade refrigeration;Peng-Robinson equation of state;Refrigerant;liquefied natural gas

References

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