Research into fine powder and large particle tyre pyrolysis

This paper investigates the kinetics of the pyrolysis of scrap tyre using thermogravimetry and a small batch laboratory-scale externally heated fixed-bed. Five particle sizes (20—40, 40—60, 60—80, 80—100, 100—200 mesh) and five heating rates (5, 10, 15, 20, 40 K min —1 ) were investigated. The results show that there is no obvious distinction on weight loss for different sizes. With increasing heating rate the weight loss regions shift to a higher temperature range and the weight loss rate increases. The activation energy ( E) and pre-exponential factor constant ( A) were calculated using the Arrhenius type kinetic model. The heat value of pyrolysis gases is in the range of 12 to 22 MJ Nm —3 . The yields of solid, liquid and gas of pyrolysis scrap tyre and tyre cube at 800 °C were investigated, the ratio of pyrolysis production composition of scrap tyre and tyre cube for gas, oil and char is found to be 35 : 23 : 42 and 10 : 31 : 59, respectively.