Title : Dual Expander Methane Cycle Liquefaction Technology Applied to FLNG

This manuscript was selected for presentation by the ADIPEC 2013 Technical Committee Review and Voting Panel upon online submission of an abstract by the named author(s). Abstract: The Gasconsult ZR-LNG TM LNG liquefaction technology, deploying a patented dual methane expander refrigeration configuration, provides an improvement in project returns and safety for single train natural gas liquefaction capacities in the range 0.2 - 2.0 million tonnes/y of LNG. The ZR-LNG TM process is characterised by a simple flowscheme, low equipment count, low energy requirement, and absence of liquid hydrocarbon refrigerants. It has special relevance for FLNG applications. Capital cost savings and enhanced production capacity are expected against the dual expander nitrogen and single mixed refrigerant systems. The process has a power requirement of typically 270 - 330 kWh/tonne of LNG - significantly lower than alternative mid-scale processes, and only marginally inferior to large-scale base load plants. The technology achieves this without enhancements such as feed pre-cooling and other process nuances often used with alternative technologies as a means of improving energy performance.