Experimental study on pyrolysis of waste tyre

Abstract

The paper introduces a set of laboratory apparatus with feature of fast pyrolysis and experimental results in pyrolysis of waste tire. The composition and productivity of derived gases are determined in relation to pyrolysis temperature from 500-1000°C and different gas phase residence time. It concludes that the time of complete pyrolysis decreases linearly with increasing temperature, while yield of char decreases slowly and yield of gas increases quickly. The gas yield at 1000°C is almost 3 times higher than that at 500°C. The gases are identified as H 2, CO, CO 2, CH 4, C 2H 4, C 2H 6 and C 3H 6 in addition to lower concentrations of H 2S and other hydrocarbon gases. The gas heating value is about 20-37MJ/ Nm 3 with the critical point of gas heating value between 700 to 800°C. The gas yield increases with increasing gas phase residence time in high temperature zone, while too longer residence time can make the gas heating value decreased.