MnCl_2-CaCl_2-NH_3再吸附温度提升系统储能特性

Energy storage properties of MnCl_2-CaCl_2-NH_3 resorption temperature-lifting system

吸附储热因其储热密度高、储热周期长、工作模式灵活而备受关注。基于热化学变温再吸附原理,构建了低品位热能温度提升实验系统,并采用吸附工质对Mn Cl_2-Ca Cl_2-NH_3对其升温储能特性进行了理论分析和实验研究。结果表明在储热、释热温度分别为135℃和140℃的条件下,最大储热密度和最大潜热显热比分别为614k J·kg^(-1)、0.418。在储热、释热温度分别为125℃和130℃的条件下,最大储热效率为28.57%。实验验证了热化学温度提升系统的可行性。

The sorption thermal energy storage has drawn burgeoning attention due to the high energy storage density, long-term heat storage capability and flexible operating modes. A novel thermochemical temperature-lifting system is established for the integrated energy storage and energy upgrade of low-grade thermal energy based on thermochemical temperature-lifting resorption technology. The resorption working pair Mn Cl2-Ca Cl2-NH3 is selected to investigate the performance of the energy storage cycle theoretically and experimentally. Results indicate that the highest thermal storage density and latent/sensible heat ratio are 614 k J·kg^-1 and 0.418 when the heat charging and discharging temperature are 135℃ and 140℃,respectively. The highest heat storage efficiency is 28.57% when the heat charging and discharging temperature are 125℃ and 130℃. The experiments verify the feasibility of the system for utilizing the low-grade thermal energy.