Abstract
The effects of bed temperature (700–900 °C), freeboard temperature (600–800 °C) and excess-air ratio (0–100%) on CO, NO x and SO 2 emissions, axial temperature profiles, and combustion efficiency of shredded waste tires have been determined in a 76.2 mm i.d. × 1.2m high fluidized-bed combustor. CO-emission levels are maintained below 400 ppm at freeboard temperatures above 750 °C with a 25% excess-air ratio. The freeboard temperature increases sharply at lower excess-air ratios or at bed temperatures below 750 °C. The overall combustion efficiency for waste tires is higher than for bituminous coal and increases with increasing excess-air ratio and bed temperature. The NO x concentration in the flue gas based on 6% O 2 has been correlated with the bed temperature, nitrogen fraction in the fuel and excess-air ratio.
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