Liquid air energy storage flexibly coupled with LNG regasification for improving air liquefaction

Xiaodong Peng, Xiaohui She, Chuan Li, Yimo Luo, Tongtong Zhang, Yongliang Li and Yulong Ding

Applied Energy, 2019, vol. 250, issue C, 1190-1201

Abstract: Liquid Air Energy Storage (LAES) stands out among other large-scale energy storage technologies in terms of high energy density, no geographical constraints, low maintenance costs, etc. However, the LAES has a relatively lower round trip efficiency, 50–60%, which is a big disadvantage. One of the main reasons is the lower liquid air yield, ∼70%, which is far from 100% due to the lack of cold energy during air liquefaction. Thus, in this paper, cold energy released during liquified natural gas (LNG) regasification is recovered and stored with pressurized propane, which is used to help air liquefaction in the LAES (denoted as LAES-LNG-CS). The LNG regasification process works independently of the LAES thanks to cold storage. Effects of various working conditions on the LAES-LNG-CS system are studied and three operation periods (off-peak, peak and full hours) of the LNG regasification process are considered. Comparisons are made between the LAES-LNG-CS and standalone LAES systems. The results show that the LAES-LNG-CS system could achieve a liquid air yield up to ∼89% and the power consumption per unit mass of liquid air is reduced by ∼32%, compared with the standalone LAES system. What’s more, the system exergy efficiency of the standalone LAES is improved by ∼28% as the air charging pressure is at 8 MPa under studied conditions. Year-round performance study indicates that the round trip efficiency of the LAES-LNG-CS is in the range of 78–89%. Therefore, the proposed LAES-LNG-CS offers a good option for the future development of the LAES system.

Keywords: Energy storage; Liquid air; Liquefied natural gas; Renewable energy (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (31)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0306261919308979
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:250:y:2019:i:c:p:1190-1201

Ordering information: This journal article can be ordered from
http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/bibliographic
http://www.elsevier. ... 405891/bibliographic

DOI: 10.1016/j.apenergy.2019.05.040

Access Statistics for this article

Applied Energy is currently edited by J. Yan

More articles in Applied Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().