Study of Decarbonation of CaCO3 for High Temperature Thermal Energy Storage

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Mitsuhiro Kubota¹  Fujio Watanabe¹  Hitoki Matsuda²  Masanobu Hasatani¹  Kyaw Kyaw² 

[1] Department of Energy Engineering & Science, Nagoya University;Research Center for Advanced Waste and Emission Management, Nagoya University

关键词: High Temperature;    Thermal Energy Storage;    Chemical Heat Pump;    Calcium Carbonate;    Decarbonation Reaction;   

DOI  :  10.1252/jcej.33.797

来源: Maruzen Company Ltd

【 摘 要 】

References(5)Cited-By(14)In order to develop a high temperature heat storage and temperature upgrading system using the CaO/CaCO3 reaction, decarbonation of CaCO3 has been carried out with thermogravimetry in the ranges of 1073–1193 K and 3–55 kPa.Calcium carbonate virtually did not decompose under the condition where the partial pressure of CO2, P, is higher than half of the equilibrium decomposition pressure of CaCO3, Pe. It implies that the present heat storage system has to be operated in pressure regions lower than half of Pe. Most decarbonation occurred during the chemical reaction-controlling period. A rate expression, employing a fractional pressure term, (Pe – P)/Pe, is proposed for the reaction-controlling period by assuming the presence of a reaction intermediate. It is found that the dependency of pressure on reaction rate is non-linear, and the reaction is strongly influenced by the change in P.

【 授权许可】

Unknown