一种压缩空气与热化学耦合储能的冷热电联产系统

To solve the severe electricity consumption problem caused by renewable energy sources, the combined cooling, heating and power system based on compressed air and thermochemical energy storage technology is proposed. During the charging process, the compression heat energy is transformed to chemical energy in the form of syngas fuel through methanol decomposition reaction; during the discharging process, the syngas fuel is burned with the high-pressure air in the combustion chamber to drive the gas turbine for electricity generation. In addition, the steam Rankine cycle, absorption refrigeration cycle and heating sub-system are employed to output cooling and heating energy based on the different energy grades to achieve high-efficiency cascade utilization of waste heat and further improve power generation. The thermodynamic model of the system is established to investigate the performance of the proposed system by developing computer code. The results indicate that higher reaction temperature and lower reaction pressure could enhance the efficiency of methanol decomposition. The electricity production could be increased by increasing the pressure ratio of both air compressor and gas turbine, and decreasing the isentropic efficiency of air compressor and the air fuel ratio. The present work could provide theoretical foundation for further engineering application of the proposed system.