Energy Storage Science and Technology ›› 2023, Vol. 12 ›› Issue (6): 1854-1861.doi: 10.19799/j.cnki.2095-4239.2023.0031

• Energy Storage System and Engineering • Previous Articles     Next Articles

Experimental study on a micro-compressed air energy storage system based on a pneumatic motor

Yonghong XU(), Yuting WU, Hongguang ZHANG(), Fubin YANG, Yan WANG   

  1. Beijing University of Technology, Beijing 100124, China
  • Received:2023-01-17 Revised:2023-02-13 Online:2023-06-05 Published:2023-06-21
  • Contact: Hongguang ZHANG E-mail:xyhcomeonljx@126.com;zhanghongguang@bjut.edu.cn

Abstract:

A compressed air energy storage (CAES) system has gained attention due to its advantages of long life, low cost, and low environmental pollution. However, the CAES system is faced with low energy density and efficiency. Herein, the parallel operation mode of pneumatic motors is proposed to improve the power output of the CAES system. The output performance, economic performance, and energy conversion efficiency of CAES with the key parameters are compared and analyzed when the pneumatic motor works in parallel or alone mode. The purpose of studying the forward and reverse performance of the pneumatic motor is to integrate the expander and compressor of the micro CAES system. It was observed that the pneumatic motor could operate in two modes to improve energy utilization efficiency. In the application scenario, combined with renewable energy power generation, the off-design operation is another critical problem faced by the CAES system. The changes in air tank pressure and load demand fluctuation represent various off-design conditions. Herein, the influence of key parameters on the performance of the CAES system is investigated via experiments under off-design conditions and improved by adopting the parallel operation mode of pneumatic motors. When the intake pressure is 10.5 bar, the maximum power output of the pneumatic motor and generator is approximately 660 and 380 W, respectively.

Key words: compressed air energy storage, pneumatic motor, parallel mode, power output

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