Electric Power ›› 2022, Vol. 55 ›› Issue (2): 28-34.DOI: 10.11930/j.issn.1004-9649.202011118

• Special Columns on Smart Grid Key Projects of the 13th Five-Year Plan:(11)Key Technologies of New Energy Storage and Energy Conversion • Previous Articles     Next Articles

Waste Heat Recovery and Utilization of Advanced Compressed Air Energy Storage System

WEN Xiankui1, LI Xiang1, DENG Tongtian1, ZHONG Jingliang1, WANG Suobin1, LIU Shi2   

  1. 1. Electric Power Research Institute of Guizhou Power Grid Co., Ltd., Guiyang 550002, China;
    2. China Southern Grid Power Technology Co., Ltd., Guangzhou 510080, China
  • Received:2020-11-25 Revised:2022-02-26 Online:2022-02-28 Published:2022-02-23
  • Supported by:
    This work is supported by National Key Research and Development of China(10 MW Advanced Compressed Air Energy Storage Technology, No.2017YFB0903600), Science and Technology Project of China Southern Power Grid Corporation(Compressed Air Energy Storage Power Station Regulation Characteristics Research and Economic Analysis, No.GZKJXM20172214)

Abstract: Compressed air energy storage is a kind of energy storage technology that has developed rapidly in recent years, which can realize energy storage and release. In order to avoid heat loss during the operation of the system, a method to recover and utilize the waste heat of the system exhaust gas and the heat exchange working fluid is proposed. On the basis of the original heat recovery system, a low expansion ratio expander is added. The converter absorbs the waste heat of the working fluid and enters the expander to do work to increase the output power of the expansion unit and improve the system efficiency. By using Aspen Plus software to establish a four-stage advanced compressed air energy storage system model under steady-state conditions for simulation. The influence of the these two factors on the system efficiency and output power is explored by changing the expander exhaust pressure and the regulator valve outlet pressure, The simulation results show that the method increases the total output power of the advanced compressed air system and improves the system efficiency.

Key words: advanced compressed air energy storage, waste heat recovery, expander, simulation, system efficiency