Theoretical analysis and experiment of thermochemical composite sorption heat storage cycle

doi:10.11949/j.issn.0438-1157.20161414

Abstract

Abstract:

A novel thermochemical composite sorption heat storage cycle was described using reversible solid-gas chemical reaction.The thermal energy storage and energy upgrade characteristics for the low-grade thermal energy was analyzed theoretically.Meanwhile,the experimental research was carried out by employing the MnCl₂/SrCl₂/NH₃ as the working pair.The theoretical analysis suggested the thermochemical composite sorption heat storage cycle not only reduces the driving temperature of external heat source,but also can enhance significantly energy upgrade capacity compared to the thermochemical adsorption heat storage cycle.Compared to the thermochemical resorption energy storage cycle,it can provide the stable heat output temperature and further improve the thermal energy grade.Under the operation condition of charging temperature of 135℃ for the desorption of MnCl₂ and temperature of 12℃ for the adsorption of SrCl₂,desorption temperature of 90℃ for the regeneration of SrCl₂,condensation/evaporation temperature of 12℃,discharging temperature of 40℃ for MnCl₂ and SrCl₂,the obtained thermal energy storage efficiency is 93.31%.The heat storage density of MnCl₂-based composite sorbents is 4393.36 kJ·kg^-1 MnCl₂ or 3734.36 kJ·kg^-1 composite sorbents.Meanwhile,the heat storage density of SrCl₂-based composite sorbents is 1947.28 kJ·kg^-1 SrCl₂ or 1655.19 kJ·kg^-1 composite sorbents.The heat storage density of materials is as 10 to 20 times as that of the sensible heat storage and phase change heat storage materials.Therefore,thermochemical composite sorption heat storage is feasible and a very potential way in storing heat.It can be used for recovering the low-grade thermal energy to promote the highly efficient utilization of thermal energy.

Key words: thermochemical composite sorption heat storage, energy upgrade, adsorption, resorption, desorption, heat storage density, recovery

摘要：

对一种基于固-气可逆化学反应的热化学复合吸附储热循环的储热特性以及能量品位提升性能进行了理论分析，并以MnCl₂/SrCl₂/NH₃作为工质对进行了实验研究。理论分析表明，热化学复合吸附储热循环不仅可以降低外界驱动热源的温度并保证输出热能温度稳定，而且能大幅度地提升输出热能的温度品位。在MnCl₂和SrCl₂都参与放热的实验工况下，获得的储热效率为93.31%。MnCl₂复合吸附剂的总储热密度按单位质量反应盐MnCl₂和单位质量的固化吸附剂计量分别为4393.36和3734.36 kJ·kg^-1；SrCl₂复合吸附剂的总储热密度按单位质量反应盐SrCl₂和单位质量的固化吸附剂计量分别为1947.28和1655.19 kJ·kg^-1。结果表明，热化学储热是一种相当有潜力的储热方式，可为低品位热能的高效回收利用提供强有力的技术支持。

关键词: 热化学复合吸附储热, 能量品位提升, 吸附, 再吸附, 解吸, 储热密度, 回收

CLC Number:

TK02

YAN Ting, WANG Ruzhu, LI Tingxian. Theoretical analysis and experiment of thermochemical composite sorption heat storage cycle[J]. CIESC Journal, 2016, 67(S2): 311-317.

闫霆, 王如竹, 李廷贤. 热化学复合吸附储热循环的理论及实验[J]. 化工学报, 2016, 67(S2): 311-317.

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