Fluidization and drying of biomass particles in a vibrating fluidized bed with pulsed gas flow
- Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Chemical and Biological Engineering
- ENSTA ParisTech, Palaiseau (France)
- Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Chemical and Biological Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Environmetnal Sciences Division
- Univ. of Tokyo (Japan). Collaborative Research Center for Energy Engineering
Fluidization of biomass particles in the absence of inert bed materials has been tested in a pulsed fluidized bed with vibration, with the pulsation frequency ranging from 033 to 6.67 Hz. Intermittent fluidization at 033 Hz and apparently 'normal' fluidization at 6.67 Hz with regular bubble patterns were observed. Pulsation has proven to be effective in overcoming the bridging of irregular biomass particles induced by strong inter-particle forces. The vibration is only effective when the pulsation is inadequate, either at too low a frequency or too low in amplitude. We dried biomass in order to quantify the effectiveness of gas pulsation for fluidized bed dryers and torrefiers in terms of gas-solid contact efficiency and heat and mass transfer rates. Furthermore, the effects of gas flow rate, bed temperature, pulsation frequency and vibration intensity on drying performance have been systematically investigated. While higher temperature and gas flow rate are favored in drying, there exists an optimal range of pulsation frequency between 0.75 Hz and 1.5 Hz where gas-solid contact is enhanced in both the constant rate drying and falling rate drying periods.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1334451
- Journal Information:
- Fuel Processing Technology, Vol. 138, Issue C; ISSN 0378-3820
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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