太阳能热发电固-气两相化学储热技术研究进展

化学储热作为一种储热密度高、存储时间长、运输距离远的储热方式,近些年来得到广泛研究。首先针对现存的几类固–气两相化学储热反应体系的基本原理和研究进展进行了综述,主要涉及金属氢氧化物反应体系、金属氧化物反应体系、碳酸盐反应体系以及水合盐反应体系。然后依据固相反应物在反应器内的运动状态,将反应器分为固定床反应器、流化床反应器和移动床反应器3类,并分别对其研究进展进行了总结。最后基于目前在化学储热研究中存在的一些不足,分析了化学储热未来的发展趋势。目前,化学储热充/放热过程的有效控制仍需进一步研究,化学反应速率与传热的强化与匹配也还存在技术困难。长期运行状况下,化学储热的循环稳定性仍有待进一步探究。

Research Progress of Solid-Gas Two-Phase Chemical Heat Storage Technology for Solar Thermal Power Generation

As a heat storage method with high heat storage density,long storage time and long transportation distance,the chemical heat storage has been widely studied in recent years.This article firstly summarized the basic principles and research progress of several existing solid-gas two-phase chemical heat storage reaction systems,mainly involving the metal hydroxide reaction,metal oxide reaction,carbonate reaction,and hydration salt reaction.Then,according to the moving state of solid phase reactant in the reactor,the reactor was divided into three types:the fixed bed reactor,fluidized bed reactor and moving bed reactor.Moreover,their research progress was summarized respectively.Finally,based on the current deficiencies in the research of chemical heat storage,the future development trend of chemical heat storage was analyzed.At present,the storage still needs further research,and there are still technical difficulties in strengthening and matching the chemical reaction rate and heat transfer.The cyclic stability of chemical heat storage under long-term operation condition still needs to be further explored.