NON-ISOTHERMAL KINETICS REACTION OF PYROLYSIS OF CASSAVA RHIZOME UTILIZING FLUE GAS
Keywords:
Pyrolysis, biomass, cassava rhizome, flue gas, kinetics reactionAbstract
The pyrolysis of a cylindrical cassava rhizome was studied to determine the kinetics parameters. The pyrolysis of the cassava rhizome under non-isothermal conditions at the heating rate of 17oC/min using flue gas in a metal kiln was investigated experimentally. In the present study, the dried cassava rhizome was examined. The temperatures inside the material and the kiln were measured. Moreover, the mass was weighed continuously during the pyrolysis process. Finally, the predicted fraction conversion was also considered and the kinetic parameters of the process were calculated using the method of Coats–Redfern. The results indicated that the mass loss started when the pyrolysis temperature was higher than 250oC and the pyrolysis process was completed at a temperature about 500oC. The obtained charcoal yield was 25.49% by weight at the pyrolysis temperature about 500oC. The result obtained from the simulation of the kinetics reaction equation, with the reaction order n = 1.8, and the predicted mass fraction conversion agreed well with the experiment only when the temperature was up to 420oC. However, in the case of the reaction order n = 1.5, the predicted fractional conversion agreed well with the experiment for a temperature higher than 420oC until the end of the process. At the end of the pyrolysis process the inside temperature of the examined material quickly increased due to the exothermic phenomena of the chemical reaction caused when the reaction order was decreased. The root mean square error of the mass fraction throughout the process was 2.4%.
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