Abstract
The reuse of coal gangue for energy recovery is developing rapidly in China, due to its advantage in achieving both economic and environmental benefits. Low-quality coal is often added to elevate the calorific value of the fuel. In this paper, the combustion characteristics as well as pollutant emissions (SO2 and NO) of coal gangue, low-quality coal and their blends at different proportions were investigated by using both thermal analysis and fixed-bed reactor. Results showed that compared with pure coal gangue, co-combustion with low-quality coal lowered ignition and burnout temperature, but only slightly decreased the activation energy. In regard to pollution emissions, the coal addition contributed to the tailing peak of SO2 emission during co-combustion, which may influence the desulfurization process. The co-combustion elevated the NO yield due to high nitrogen content in the coal used. An increase in char content with increasing coal ratio in turn promoted a reduction in NO.
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