Abstract
Oxygen-fuel combustion is an effective and promising method of steadily minimizing municipal sludge volume at the same time exploiting available heat and falling emissions. The effects of temperature, oxygen concentration, and CaO addition on SO2 and NOx emissions from municipal sludge combustion in CO2/O2 atmosphere were systematically explored via a lab-scale electrically heated tubular furnace in this work. The results show that the minimum average emissions of both SO2 and NOx were observed at 800 °C. Compared with air, all oxygen-fuel atmospheres reduced SO2 emission, and a salient effect was observed with 30% of oxygen concentration. In contrast, the inhibition of NOx emission was inconspicuous and exacerbated in some cases. With a lower oxygen concentration (21%), CaO evidently reduced SO2 emission and 8 wt% addition performed the best. The removal efficiency of NO by CaO addition was poor and only exhibited slight inhibition with 5 wt% addition.
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