Effect of SiC particle size on performance of a directlyirradiated fluidized bed gas heater

Author(s): Sae Han Park, Min Ji Lee, Chae Eun Yeo, Sung Won Kim
School of Chemical and Material Engineering, Korea National University of Transportation, Chungju-si, Chungbuk, Republic of Korea
International Journal of Smart Grid and Clean Energy, vol. 9, no. 2, March 2020: pp. 298-303
ISSN: 2315-4462 (Print)
ISSN: 2373-3594 (Online)
Digital Object Identifier: 10.12720/sgce.9.2.298-303

Abstract: Performance of solar fluidized bed gas heater is strongly influenced by the physical properties of the particles. Effect of SiC particle size on performance of the directly-irradiated fluidized bed gas heater (50 mm-ID X 100 mm high) has been determined. The outlet gas temperatures showed a maximum value with increasing gas velocity due to the particles motion by bubble behaviour in bed, and the maximum values were found at 3.6 Umf for fine SiC and less than 2.0 Umf for coarse SiC. Energy production from the receiver increased with increasing gas velocity, showing with maximum 18 W for the fine SiC and 23 W for the coarse SiC. The thermal efficiency of the receiver increased with increasing gas velocity, but was affected by the content of finer particles. The maximum thermal efficiency of the receiver was 14% for fine SiC and 20% for coarse SiC, but showing higher for the fine SiC at the same gas velocity.

Keywords: solar thermal energy, fluidized bed, gas heater, silicon carbide, particle size
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