CLEAN TECHNOLOGIES AND ENVIRONMENTAL POLICY, cilt.21, ss.1281-1291, 2019 (SCI İndekslerine Giren Dergi)
Thermochemical decomposition of waste tires was evaluated in order to produce solid and gaseous products within the aim of waste-to-energy concept. Pyrolysis and gasification occur in an oxygen-starved environment to thermally degrade organic wastes. Waste tires form a large volume of a landfill space that may lead to serious environmental issues and management complexities. Proximate and ultimate analyses reported that approximately 80% carbon in waste tire can be converted to different solid, liquid and gaseous forms for energy gain. Pyrolysis and gasification experiments were carried out in a circulating fixed-bed reactor with cyclone separator at varying temperatures between 600 and 800 degrees C. Dried air (0.05-0.5L/min) and pure oxygen (0.01-0.015L/min) were fed to gasification reactor as partially oxidizing agents. Pyrolysis gasification (PyroGasificationPG) was conducted to produce syngas which mainly contains carbon monoxide and hydrogen. One and 4h of cooking time for the first-step pyrolysis were applied in a nitrogen-rich medium before gasification to enrich carbon amount in fuel. A syngas rich in H-2, CH4 and CO with a high calorific value of almost 4900kcal/m(3) was obtained in gasification experiments performed with 0.05L/min of dried air. Volumetric percentages of hydrogen and methane in syngas were around 35% and 40%, respectively. More than 65% mass and 80% volume reductions which are very important for waste management hierarchy and minimization were achieved by gasification of waste tires.