Research on recovery and utilization of waste heat in advanced compressed air energy storage system
Xiankui Wen, Da-Hui Yang, Jingliang Zhong, Tingyong Feng, Xiang Li
Abstract
In order to improve the efficiency of the advanced compressed air energy storage system, a method for recycling the system exhaust gas and waste heat of heat exchange working medium is proposed. A low expansion ratio expander is added to the original system. Residual heat enters the expander to work to increase the total output of the system. The Aspen Plus software is used to establish a four-stage advanced compressed air energy storage system model under steady-state operating conditions and perform simulation. The simulation results show the maximum increment of system output power is 4713.72 kW and its corresponding increment of system efficiency is 7.34% in comparison with no waste heat recovery, and verifies the effects of different expander exhaust pressures and pressure regulator valve outlet pressures on system efficiency and output power.