Journal
ENERGY
Volume 216, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2020.119308
Keywords
Process design; Cold energy utilization; Liquid air energy storage; LNG regasification; Exergy analysis
Categories
Funding
- National Research Foundation of Korea (NRF) - Korea Government (MSIT) [2020R1F1A1050617]
- National Research Foundation of Korea [2020R1F1A1050617] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A novel power-management-system design is proposed, coupling liquid air energy storage with LNG regasification, which shows high efficiency and capacity. The system utilizes LNG cold energy in two different mechanisms to enhance energy utilization efficiency and flexibility in responding to power demand.
A novel power-management-system design coupling liquid air energy storage (LAES) with liquefied natural gas (LNG) regasification is proposed that combines flexibility in responding to power demand, presented high energy efficiency and capacity. The proposed liquefied natural gas-thermal energy storage-liquid air energy storage (LNG-TES-LAES) process uses LNG cold energy via two different mechanisms. During on-peak times, when the proposed process requires no power consumption to meet the relatively higher electricity demand, LNG cold energy is recovered and stored via liquid propane. During off-peak times, the proposed process uses both cold energy from LNG and liquid propane, effectively doubling the cold energy available and enhancing the process flexibility. The liquid propane cold energy is used for air compression to reduce the power input requirement, while LNG cold energy is used mainly to liquefy air. These unique features afforded an electrical round-trip efficiency of 187.4% and an exergy efficiency of 75.1%, which are the highest among recently reported values. The energy capacity for the regasification of 1 MTPA LNG was 12.14 MW, which is adequate for bulk power management systems. By adopting flexibility, LNG cold energy has been distributed efficiently, and where LNG could be continuously regasified in the energy storage/release processes. (C) 2020 Elsevier Ltd. All rights reserved.
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