Journal
ENERGY
Volume 140, Issue -, Pages 106-115Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2017.08.054
Keywords
Process design; Cryogenic energy storage; LNG regasification; Process integration; Exergy analysis
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Funding
- Technology Innovation Program - Ministry of Trade, Industry & Energy (MOTIE, Korea) [10067793]
- Korea Evaluation Institute of Industrial Technology (KEIT, Korea)
- Korea Evaluation Institute of Industrial Technology (KEIT) [10067793] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study aims to develop an efficient cryogenic energy storage (CES) process using the exergy from liquefied natural gas (LNG) regasification. While LNG has low internal energy, it has high exergy because of its cryogenic characteristics, and much of this exergy is wasted in the process of regasification. Thus, this work focuses on the recovery of LNG cold exergy to store cryogenic energy using air as a working fluid. The cold exergy of LNG is transferred in two forms: cold transfer by heat exchange to liquefy air, and shaft work transfer by direct expansion of LNG to compress the air. Thermodynamic analysis of the proposed process is carried out in three exergy flow steps: the LNG regasification step, the air liquefaction step, and the air expansion step. In addition, the proposed system has an advantage which system can store and release the energy simultaneously. Therefore, daily produced energy by CES system is more than double compare to the most recent contributions that have divided operation modes for energy storage and release. This study not only proposes an efficient energy storage process that can generate power flexibly but also highlights further possibilities for performance enhancement by thermodynamic analysis. (C) 2017 Elsevier Ltd. All rights reserved.
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