Cost Optimization of Tank-type Compressed Air Energy Storage Systems Based on Exergy Analysis

doi:10.3901/JME.2022.12.261

Journal of Mechanical Engineering ›› 2022, Vol. 58 ›› Issue (12): 261-269.doi: 10.3901/JME.2022.12.261

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Cost Optimization of Tank-type Compressed Air Energy Storage Systems Based on Exergy Analysis

HU Yu^1,2, SEAMUS D Garvey³, XU Weiqing^1,2, CAI Maolin^1,2, SHI Yan^1,2

1. School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191;
2. Beijing Key Laboratory of Pneumatic Thermal Energy Storage and Energy Supply, Beijing 100191;
3. Department of Mechanical, Materials and Manufacturing Engineering Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD United Kingdom

Received:2021-10-15 Revised:2022-03-01 Online:2022-06-20 Published:2022-09-14

Abstract

Abstract: Cost of compressed air energy storage (CAES) systems attracts much attention. Almost all CAES systems have been studied to store energy in the form of high-pressure air and heat. For CAES systems, the storage cost of the system is inexpensive for the containers formed by natural environment such as underground caves or deep underwater containment, but this has higher requirements on the geographical environment. As for the more universal tank-type CAES systems, limited by the expensive cost of high-pressure gas storage tank, and their economy needs to be improved. Based on exergy cost analysis, considers the optimization method of tank CAES system cost. And proposes two strategies to reduce the cost of tank-type CAES system. Storing more exergy in the form of thermal energy. Cool the high-pressure air and store it in a cryogenic tank. The results reveal that compared with the traditional CAES system, the energy storage cost of CAES system can be reduced by 52% by adopting high temperature compression and low temperature storage. Considers the real gas effects, the optimal storage pressure is about 21 MPa.

Key words: compressed air energy storage, exergy, cost analysis, real gas effect, low temperature storage

CLC Number:

HU Yu, SEAMUS D Garvey, XU Weiqing, CAI Maolin, SHI Yan. Cost Optimization of Tank-type Compressed Air Energy Storage Systems Based on Exergy Analysis[J]. Journal of Mechanical Engineering, 2022, 58(12): 261-269.

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Cost Optimization of Tank-type Compressed Air Energy Storage Systems Based on Exergy Analysis

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