Gasification And Combustion Of Waste Tires For Process Heat And Power Generation

ABSTRACT Numerical modeling technique based on computational fluid dynamics CFD has been used to study the gasification and combustion of chipped scrape tire in a two-stage system for recycling scrape tire for heat recovery. Effect of equivalence ratio on the syngas composition and combustion behavior was investigated. Results indicated that it is possible to recover energy from recycled waste tire through this two-stage system. Optimal gasification of chipped tires was achieved in the primary chamber at equivalence ratio around 0.3 in which the average syngas composition constituted of 0.22 and 0.17 for of CO and H2 respectively. Further the high velocity staged air injection to the secondary chamber created turbulent jet mixing effect thereby uniform temperature distribution is achieved and is contained in the upper half of the secondary chamber. The uniform temperature distribution and the increased wall heat flux at optimal equivalence ratio clearly indicates better heating rate of the water tubes located in the secondary chamber for steam generation. This study contributes additional understanding of the complex phenomena occurring in a two-stage gasification and combustion system of scrape tires in addressing the environmental challenge of recycling scrap tires.