Abstract
Experiments were conducted in a pilot-scale test furnace to investigate the influence of CaO additive on the growth of ash deposits and the characteristics of fly ash. The amounts of CaO additive mixed with Datong coal were 0 and 3.5 wt %, and the operating temperature of the furnace was 1573 K. An oil-cooled probe was inserted in the furnace, and a charge-coupled device (CCD) monitoring system was equipped with a water-cooling system to obtain the variation of thickness of the deposits with time. This system was used to evaluate the buildup of the deposits. Online monitoring of flue gas was carried out for the emissions of NOx and SO2 using the flue gas analyzer. The fly ash was collected from the bottom of the cyclone separator, and its characteristics were determined using a range of analytical techniques, including polarization microscopy, physisorption analysis, X-ray diffraction (XRD), and X-ray fluorescence (XRF). Frequent shedding of ash deposits was observed for pure coal. Nevertheless, under the...
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