Gasification kinetics of waste tire-char with CO 2 in a thermobalance reactor

Abstract

The effects of gasification temperature (850–1000°C) and partial pressure of CO 2 (0.3–1.0 atm) on gasification rate of tire-char/CO 2 have been determined in a thermobalance reactor. The gasification rate was found to be independent of char size for sizes less than 0.65 mm and initial sample mass less than 1.0 g. Among the tested models, the modified volume reaction model is best for predicting our conversion data. The kinetic parameters (activation energy, pre-exponential factor and reaction order) are determined on the basis of a modified volume-reaction model. From the Arrhenius plot ( k m vs 1/ T), the activation energy and the pre-exponential factor are found to be 57.06 kcal/mol and 1.49 × 10 8/min, respectively. The reaction order is found to be 0.68 with respect to CO 2 partial pressures of 0.3–1.0 atm at 950°C. The gasification reaction rate of tire-char/CO 2 may be expressed as dX/ dt = (1.49 × 10 8) exp(−57,060/RT)(P CO 2 ) 0.68(1-X) .