Basic characteristics of fast-reaction thermogravimetric analysis for kinetic studies of Ca( OH) 2/CaO fluidized thermochemical heat storage
FENG Yupeng
DENG Boyu
ZHANG Shuangming
DING Yi
YANG Xinhua
ZHANG Man
YANG Hairui
Abstract：Thermal energy storage is necessary for improving energy utilization efficiency. Using Ca( OH) 2/CaO in fluidized bed reactors can realize rapid storage and release large-scale thermal energy, and hence, research on the reaction kinetics of Ca(OH)2/CaO under fluidization is important. However, the thermogravimetric analysis ( TGA) technique cannot provide the constant temperature reaction con?ditions required for Ca( OH) 2 , and its mass transfer inhibition phenomenon is significant. Hence, a fast-reaction TGA technique was pro?posed that can provide reaction conditions closer to those of fluidization for Ca(OH)2/CaO, when compared with the conventional TGA technique. The fast-reaction TGA technique could provide a higher heating rate and better mass transfer conditions for heat storage materi?al by rapidly moving the high-temperature reactor and introducing a high-speed purge gas. The influence of the reactor temperature, mov?ing speed and airflow on the fast-reaction TGA performance was clarified by decoupling experiment. When tested with Ca( OH) 2 , the de?viation in the material conversion obtained with the fast-reaction TGA technique from that obtained with the conventional TGA technique is only 0.81％, which demonstrates the accuracy of the fast-reaction TGA.
Keywords：thermochemical heat storagefluidizationfast-reaction thermogravimetric analysiscalcium hydroxidecalcium oxide
Publication Date：2022-12-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1-10 )