Optimization of mixed-refrigerant system in LNG liquefaction process

Kyungjae Tak, Wonsub Lim, Kwangho Choi, Daeho Ko, Il Moon

Research output: Contribution to journalArticle

14 Citations (Scopus)


LNG liquefaction is an energy intensive process. For this reason, various liquefaction processes for saving energy exist. Searching optimal process condition is very difficult because of its high nonlinearity. Pressure level, refrigerant flowrate, and refrigerant composition are key operation variables to reduce energy consumption. These variables play an important role in affecting the overall performance. Compressor is a major energy-consumption unit in LNG plant and it spends much energy depending on operating conditions. In this paper, searching optimal condition is carried out by using simultaneous optimizations. NLP model is applied for the SMR process. The optimization result shows that refrigerant composition is a major key variable and half of energy consumption can be reduced by changing operating conditions and refrigerant composition only.

Original languageEnglish
Pages (from-to)1824-1828
Number of pages5
JournalComputer Aided Chemical Engineering
Publication statusPublished - 2011

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Computer Science Applications

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