Evaluation of Carbon Dioxide Absorption Characteristics Lithium Ortho-Silicate in Chemical Heat Storage
- 1 Department of Chemical Engineering, Nagoya University, Nagoya, Japan
- 2 Department of Chemical Engineering, Nagoya University, Nagoya, Japan
- 3 Department of Chemical Engineering, Nagoya University, Nagoya, Japan
Abstract
We report the development of technology that may contribute to a reduction in greenhouse gas emissions and improve the energy efficiency of the CO 2 capture process. Lithium ortho-silicate is a suitable solid sorbent for capturing CO 2 . This reversible chemical reaction is also applicable to chemical heat storage. The absorption reaction characteristics of lithium ortho-silicate were studied by a thermogravimetric method and a volumetric method that demonstrated the influence of heat and mass transfer limitations in a packed bed designed to be as small as possible. We developed a method for measuring the absorption reaction characteristics in the experiments. In the experiments, a constant conversion fraction of 60% was observed. The reaction system was stable to repetition. The CO 2 absorption rate depends on the CO 2 pressure and reactor temperature. The absorption rate was determined at several reactor temperatures when the conversion fraction was 0.3. In this study, the maximum absorption rate was obtained at 670 o C. It was demonstrated that lithium ortho-silicate is suitable for use in a chemical heat storage system.
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