Several systems for cold energy saving in LNG regasification terminals through electric energy production have been studied and developed up to now based on closed cycles.

This paper schematically compares the main features of a nitrogen high temperature closed cycle with those of a Rankine cycle.

The actual technical possibility of achieving modular plants for 2×109 Nm3/y gasified LNG and for 61 MWh/h electric production with a 993 K max. temperature nitrogen closed cycle is examined.

The Authors illustrate the efficiency trend versus temperature and report the future development of the above cycle with temperatures up to 1093 K.

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