Fluidization and drying of biomass particles in a vibrating fluidized bed with pulsed gas flow

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 0.33 to 6.67Hz. Intermittent fluidization at 0.33Hz and apparently ‘normal’ fluidization at 6.67Hz with regular bubble patterns...

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Bibliographic Details
Published in:Fuel processing technology 2015-10, Vol.138 (C), p.471-482
Main Authors: Jia, Dening, Cathary, Océane, Peng, Jianghong, Bi, Xiaotao, Lim, C. Jim, Sokhansanj, Shahab, Liu, Yuping, Wang, Ruixu, Tsutsumi, Atsushi
Format: Article
Language:English
Subjects:
09 BIOMASS FUELS
Biomass
Contact
DRYER
Drying
Fluidized bed
Fluidized beds
Fluidizing
Gas flow
Gas-solid flow
KINETICS
Pulsation
QUALITY
SAWDUST
SEEDS
Vibration
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Summary: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 0.33 to 6.67Hz. Intermittent fluidization at 0.33Hz and apparently ‘normal’ fluidization at 6.67Hz 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. Drying of biomass has been carried out 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. 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 0.75Hz and 1.5Hz where gas–solid contact is enhanced in both the constant rate drying and falling rate drying periods. •Gas flow rate, temperature and vibration all have positive effects on drying.•Regular bubble pattern was not found below 3Hz, gas channels were observed instead.•The optimum pulsation frequency for biomass drying was found to be 0.75–1.5Hz.•Damping factor of fluidized bed was found decreasing during drying.
ISSN:0378-3820
1873-7188
DOI:10.1016/j.fuproc.2015.06.023