一种基于喷射器和吸收式制冷的燃煤发电机组耦合新型多能联供液化空气储能系统的能、㶲及经济性分析

Abstract The liquefied air energy storage system coupled with coal-fired power unit (CFP-LAES) enhances the peak regulation capability of the unit, facilitating supply–demand balance of the grid. In order to maximize the energy utilization of CFP-LAES system and broaden the application scenarios, a novel CFP-LAES system for the supply of electricity, heat energy and cold energy is proposed in this paper. The output power of CFP-LAES system is improved by introducing an ejector , and the cooling is realized by absorption refrigeration . The thermodynamic model of the multi-generation CFP-LAES system is established and its energy, exergy and economic analyses are carried out. At the same time, the influence of different air liquefaction technologies on system performance is studied. The results show that from the perspective of system efficiency and flexible operation, scheme Ⅵ has the best performance, with an energy efficiency of 88.79 % and an exergy efficiency of 66.92 %. The energy density of auxiliary peak regulation of the system is 238.64 kWh/m 3 , energy density of auxiliary heating is 51.39 kWh/m 3 and energy density of auxiliary cooling is 28.14 kWh/m 3 . From the perspective of economy, scheme Ⅴ has the best performance, with a return on investment of 29.52 % and a dynamic payback period of 3.00 years. In addition, the air liquefaction effect of Heyland cycle is the best, and the liquefaction efficiency can reach 88.22 %. The good performance shows that the proposed system has the potential to become a competitive new direction for LAES applications.