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Enhanced single mixed refrigerant process for stranded gas liquefaction.

Author(s) : BARCLAY M., SHUKRI T.

Summary

This paper introduces an enhanced single mixed refrigerant process suitable for medium-scale (0.5-1.5 mtpa) and offshore natural gas liquefaction. The cycle fully utilizes two-phase expansion to achieve reasonable process efficiency with a single-cycle process. Two-phase expanders have been developed for commercial application and operated since 2004 to produce LNG at a nitrogen rejection unit site in Poland. Integration of two-phase expanders into mixed refrigerant processes offers the potential to decrease equipment footprint, installed compressor capacity, weight, complexity and flammable liquid inventory. However, these expanders are still new and have yet to be proven in a large capacity plant. This paper includes potential results and discussion of mixed refrigerant processes using two-phase expanders. Taking full advantage of two-phase expanders can enable the use of single-cycle mixed refrigerant liquefaction process. Single-cycle processes use one working fluid as the refrigerant and have lower equipment, valve, line, instrument counts and complexity. The design can also be highly modular, allow the full utilisation of installed driver capacity, and shorten the time to market. These are advantages that are highly relevant to offshore and select onshore liquefaction facilities.

Details

  • Original title: Enhanced single mixed refrigerant process for stranded gas liquefaction.
  • Record ID : 2008-1113
  • Languages: English
  • Source: LNG 15. Proceedings of the 15th International Conference and Exhibition of Liquefied Natural Gas.
  • Publication date: 2007/04/24

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