LNG Cold Heat Energy Utilization System : Part 1 : System Concept and Performance

Abstract

An energy storage system using liquid air is studied. Liquid air is produced by off-peak power and LNG cold heat, and can be stored at atmosphere pressure. When on-peak power is needed, the stored liquid air is pumped to high pressure and fed to the combustor of a gas turbine. Cold heat energy of liquid air at day time is stored and reused to generate liquid air at night. When the system is applied to LNG base on the condition of 50 ton/h LNG flow rate, the power storage efficiency is found to exceed 70%.