微型绝热压缩空气储能与氢能耦合系统建模与性能分析OA

In response to the demand for renewable energy consumption,a micro isolated compressed air energy storage and hydrogen coupling system is proposed.By establishing thermodynamic mathematical models for the compressor,storage tank,electrolyzer and fuel cell,and combining the first and second laws of thermodynamics to evaluate the system's energy efficiency,the effects of multi-stage compression,expander efficiency and hydrogen fuel cell waste heat recovery on system performance are studied using energy balance and exergy analysis methods.The results show that when the efficiency of the expander increases from 60%to 90%,the system cycle efficiency rises from 40.82%to 61.23%.By recovering 1 980 kJ of heat from the fuel cell,the system cycle efficiency can be increased from 57.83%to 60.55%,an increase of 2.72 percentage points,and the relative efficiency improvement reaches 4.70%.The multi-stage compression optimization indicates that when the total compression ratio is 25,increasing the number of compression stages can reduce the outlet temperature and isentropic power consumption.The output power of the hydrogen fuel cell increases significantly with the increase in current density.When the working current is 25 A,the power reaches 2 kW,and the hydrogen molar consumption is 0.010 364 mol/s.The coupling system provides a new path for the development of renewable energy consumption and hybrid energy storage technology through energy cascade utilization and waste heat recovery.