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Heat release performance and evolution of CaO particles under fluidization for CaO/Ca(OH)2 thermochemical heat storage
Process Safety and Environmental Protection ( IF 6.9 ) Pub Date : 2021-09-17 , DOI: 10.1016/j.psep.2021.09.019
Zhiguo Bian 1 , Yingjie Li 1 , Chunxiao Zhang 1 , Jianli Zhao 1 , Tao Wang 2 , Wentao Lei 2
Affiliation  

The fluidized bed reactor has been recognized for large-scale CaO/Ca(OH)2 heat storage system. In this work, the effects of critical factors such as particle size, fluidization number, steam concentration in hydration, initial temperature, cycle number and type of carrier gas on heat release performance of CaO in the fluidized bed reactor were experimentally investigated. CaO under fluidization state exhibits excellent cyclic stability on the heat release performance. The decay in heat release temperature of CaO under fluidization state is less 10% of that under static state. With increasing the cycle number, the heat release temperature of CaO using N2 as carrier gas decreases because of the rapid expansion of particles. After 20 cycles with N2 as carrier gas, the average particle size of CaO increases by 46.2% and the hydration conversion of CaO reaches above 95%. The hydration conversion of CaO experienced 20 cycles using air as carrier gas is 20% lower than that using N2 as carrier gas due to the presence of CO2 in air. The experimental investigation of CaO/Ca(OH)2 heat storage provides an important reference for the development of CaO/Ca(OH)2 system using the fluidized bed reactor.



中文翻译:

CaO/Ca(OH)2热化学蓄热流态化CaO颗粒的放热性能及演化

流化床反应器已被公认为大型CaO/Ca(OH) 2蓄热系统。在这项工作中,通过实验研究了粒径、流化数、水合蒸汽浓度、初始温度、循环次数和载气类型等关键因素对流化床反应器中 CaO 放热性能的影响。CaO在流化状态下的放热性能表现出优异的循环稳定性。CaO在流化状态下的放热温度衰减小于静态下的10%。随着循环次数的增加,由于颗粒的快速膨胀,以N 2为载气的CaO的放热温度降低。用 N 2循环 20 次后作为载气,CaO的平均粒径增加了46.2%,CaO的水合转化率达到95%以上。由于空气中存在CO 2,使用空气作为载气进行20次循环后CaO的水合转化率比使用N 2作为载气的低20% 。CaO/Ca(OH) 2蓄热实验研究为利用流化床反应器开发CaO/Ca(OH) 2体系提供了重要参考。

更新日期:2021-09-24
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