ABSTRACT

Among various thermo chemical conversion methods, pyrolysis has been considered as the most efficient way of producing liquid fuel from organic solid wastes. To look for a definite source of renewable energy as a fuel from organic solid wastes, a project work on the study of pyrolytic behavior of solid wastes including scrap tire has been carried out. Pyrolysis kinetics of scrap tires of bicycle, motor and truck have been investigated thermo gravimetrically under nitrogen atmosphere at heating rates of 10 and 60°C/min and temperature range of 100-800°C. The results show that the initial reaction temperature regions are 130~140°C for bicycle, 140~160°C for motor cycle, 130~150°C for truck tire. The tires exhibit similar behaviors that the initial reaction temperature decreases, but reaction range and reaction rate increase when heating rate is increased. The DTG peaks shifted to higher temperature regions for higher heating rates. Among the three samples the value of total weight loss is higher for truck tire and lower for bicycle tire. The faster degradation occurs for truck tire and slower for motor cycle tire. The overall rate equation for all tire wastes can be modeled satisfactorily by a simple equation from which the kinetic parameters such as the activation energy (E), the frequency factor (A) and the reaction rate (K) can be determined. For different heating rates the average activation energy, E = 70.68kJ/mol for bicycle tire, 76.12kJ/mol for motor cycle tire and 67.00kJ/mol for truck tire and the average frequency factor  A = 7.32×10⁶ min^-1 for bicycle, 32.38×10⁶ min^-1 for motor cycle and 11.82×10⁷ min^-1 for truck tire. Generally the value of activation energy increases with increasing conversion factor up to its certain value and then decreases adversely. Finally an internally heated, fixed-bed pyrolysis system was used to produce fuel based liquids from scrap tire.The product yields were liquid 55%, char 30%. The heat value of liquid was 39.456kJ/kg and char was 25.45kJ/kg. DTA curves shows that the degradation reaction is endothermic reaction.    

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