绝热-近等温复合压缩储能过程热-湿-压耦合动态特性研究

To further clarify the energy-mass conversion mechanisms in hybrid compressed air energy storage (CAES) processes and enhance energy conversion efficiency? a thermal-moisture transfer model for adiabatic-near-isothermal hybrid compression energy storage coupled with evaporation and condensation is established. This model is based on the macroscopic mass and energy equations for compressed dry air. incorporating a non-equilibrium phase-change heal and mass transfer model. The dynamic evolution and competition patterns of the working fluid's temperature, pressure, and moisture during the energy storage process were investigated to elucidate the influence mechanism of thermal-moisture coupling on system performance. The research results indicate that liquid evaporation during the near-isothermal compression stage of the liquid piston is regulated by the mechanism of competition between temperature rise and pressure rise? exhibiting non-monotonic changes. In contrast? during the expansion stage? condensation and evaporation alternate within extremely short time intervals. demonstrating strong transient characteristics. The stale of the air at the outlet of the buffer tank determines the initial coin, li i ions ol the suction phasr in tin.- liquid piston, while tin- discbarge state ol the liquid piston influences the condensation intensity in the gas storage tank. This series-parallel coupling structure allows condensation effects within the gas storage lank to propagate and amplify through the system? resulting in a daily net condensation capacity of 11 586. 75 g. The latenl heat exchange involved in the evaporation and condensation of the working fluid during the energy storage process significantly alters the system's thermal inertia and temperature response. The evaporative heal absorption effect delays the rise in gas temperature to some extent? enhancing the near-isothermal characteristics of the process? while the condensation heal release effect slows the temperature decline rate and prolongs the duration of medium to high temperatures.