摘要
CaO-based heat carriers have shown great prospects for thermochemical energy storage in concentrated solar power systems due to the features such as rich reserves,environmental safety,high energy storage densities and high operation temperatures.However,the density decay because of sintering and poor direct solar absorption of white CaO based heat carriers are the two main obstacles lying on the way to the realistic applications.This work introduced dark Mn-based inert support into calcium heat carriers,attempting to solve the above problems simultaneously.As an inert support,the finely dispersed Ca_(2)MnO_(4) functioned as the metal framework to resist CaCO_(3)/CaO sintering.Consequently,the cyclic stability of CaO-based heat carriers,resulting in the high energy storage densities of~2000 kJ/kg even over 20 cycles.As a dark material,Ca_(2)MnO_(4) successfully darkened CaO-based heat carriers,thereby greatly enhanced the direct solar absorption.In addition,the granulation of CaO-based heat carriers was also studied.The pellets showed satisfactory attrition resistance with only 9.85 wt% mass loss over 3200 cycles.In general,good physicochemical performance of Mn-doped CaO-based heat carrier endows it with great prospects for solar energy storage.
CaO基载热体凭借其储量丰富、安全无害、能量密度高等应用优势在聚光太阳能发电耦合热化学储能系统中展现出良好的应用前景。然而,白色CaO基载热体因高温烧结而导致的密度衰减和较低的太阳光直接吸收能力是阻碍其应用的两大障碍。本研究将深色锰基惰性支撑引入钙热载体,试图同时解决上述问题。作为一种惰性支持物,分散均匀的Ca_(2)MnO_(4)起到了金属骨架的作用,以抵抗CaCO_(3)/CaO的烧结,使其在20次循环中也能维持~2000 kJ/kg的高能量密度。另一方面,作为一种深色物质,Ca_(2)MnO_(4)成功地使CaO基载热体的颜色明显变深,从而大大提升了其对太阳光的直接吸收性能。此外,还对深色CaO基载热体进行了造粒成型处理,成型后的球形颗粒具备良好的抗磨损性能,在3200次旋转中质量损失率仅达9.85 wt%。总之,掺锰CaO基热载体具备良好的物理化学性能,在未来太阳能储存方面具有良好前景。
基金
Project(2024BAB094)supported by the Key Research and Development Program of Hubei Province,China
Project(2024040801020296)supported by the Natural Science Foundation of Wuhan City,China
Project(52276113)supported by the National Natural Science Foundation of China。
作者简介
Corresponding author:HU Ying-chao,PhD,Associate Professor,E-mail:ychu@mail.hzau.edu.cn,ORCID:https://orcid.org/0000-0001-9118-1895。
