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Thermal transport and chemical conversion in single reacting sorbent particles |
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| Authors: | Lindsey Yue Alicia Bayon Wojciech Lipiński |
| Affiliation: | 1. College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601 Australia
Contribution: Conceptualization, Data curation, Formal analysis, ?Investigation, Methodology, Validation, Visualization, Writing - original draft, Writing - review & editing;2. CSIRO Energy, Newcastle, NSW 2300 Australia;3. College of Engineering and Computer Science, The Australian National University, Canberra, ACT 2601 Australia |
| Abstract: | The effects of particle size and carbon dioxide concentration on chemical conversion in engineered spherical particles undergoing calcium oxide looping are investigated. Particles are thermochemically cycled in a furnace under different carbon dioxide concentrations. Changes in composition due to chemical reactions are measured using thermogravimetric analysis. Gas composition at the furnace exit is evaluated with mass spectroscopy. A numerical model of thermal transport phenomena developed previously is adapted to match the physical system investigated in the present study. The model is used to elucidate effects of reacting medium characteristics on particle temperature and reaction extent. Experimental and numerical results show that (1) an increase in particle size results in a decrease in carbonation extent, and (2) the carbonation step consists of fast and slow reaction regimes. The reaction rates in the fast and slow carbonation regimes increase with increasing carbon dioxide concentration. The effect of carbon dioxide concentration and the distinction between the fast and slow regimes become more pronounced with increasing particle size. |
| Keywords: | calcium carbonate carbon dioxide capture concentrated solar thermal thermal transport thermochemical looping |