Integration of LNG regasification and Cryogenic Energy Storage systems towards addressing cold-loss during regasification, intermittent renewable energy and CCU

AbstractCryogenic Energy Storage (CES) systems are showing promising results as an alternative to pumped hydro, compressed air, etc. The advantages of such systems include being independent of location, having high lifetime, sustainable working fluid, being naturally available, abundant storage materials, and comparable efficiency. On the other hand, natural gas is one of the cleanest energy sources. Natural gas is transported as liquid and regasified at the terminals for distribution. During regasification, considerable refrigeration is lost due to the gasification processes, such as heating by seawater, etc. Thermal energy storage (TES) can recover lost refrigeration and later be used in CES systems. This paper attempts to integrate an LNG regasification plant with a typical CES system powered by renewable energy sources. It proposes heat integration to improve its overall efficiency by including oxy-combustion of natural gas. Optimum operating conditions for the oxy-combustion plant with nitrogen as a working fluid were obtained.