Research on CPU Waste Heat Utilization System of CAES Coupled Oxyfuel Coal-Fired Unit

Abstract

In order to reduce carbon emission and increase flexibility of thermal power units, a new power system of compressed air energy storage coupled with oxyfuel coal-fired units using CPU waste heat(CFPP+CAES+CPU) was proposed. Using Ebsilon Professial and Aspen Plus software to build a model, the thermodynamic characteristics and economic analysis of the system were carried out. The results show that: In fixed coal consumption mode, the exergic power of CFPP+CAES+CPU unit increased by 0.745% at the lowest and 1.216% at the highest. Exergic damage of exergic power of CFPP+CAES+CPU unit decreased compared with control unit, while exergic efficiency of heat exchanger in CPU increased. The maximum economic mode of CFPP+CAES+CPU unit is that when CO2 and carbon emission rights are sold, the minimum LCOE is 0.374¥/kWh when carbon tax is not considered