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Determination of Kinetic Parameters of Rice Husks in Oxygen Using Thermogravimetric Analysis by K.G. Mansaray; A.E. Ghaly is a Engineering article available to read on EtoBox.

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Rice husks, as a renewable source of energy, can provide a continuous supply of liquid and gaseous fuels through thermochemical conversion processes. However, a proper understanding of the thermal properties and reaction kinetics of rice husk plays an important role in the ecient design, operation and modeling of these systems. This paper describes the kinetics of the thermal degradation of four varieties of rice husk (Lemont LG, ROK 14, CP 4 and Pa Potho) in pure oxygen (99.5% oxygen, 50 ppm water, 40 ppm total hydrocarbons and 1 ppm solvents) atmosphere from ambient temperature to 7008C at the heating rate of 208C min À1 . Two distinct reaction zones were observed for all varieties of rice husk. The kinetic parameters (activation energy, pre-exponential factor and order of reaction) were determined for the two reaction zones by applying thermo-analytical techniques to the reaction kinetics. Thermal degradation rates in the ®rst reaction zone were signi®cantly higher than those in the second reaction zone. The activation energies were in the range of 142.7±188.5 kJ mol À1 and 11.0±16.6 kJ mol À1 for the ®rst and second reaction zones, respectively.

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Author

K.G. Mansaray; A.E. Ghaly

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0961-9534)

Published

1999

Language

EN

Field

Engineering (Physical Sciences)