Abstract
ABSTRACTThe ignition characteristics and combustion processes of coal gangue pellets in O2/CO2 atmosphere were studied in a drop tube furnace with oxygen concentration range from 21% to 100%, the experimental gas flow temperature was set to 923, 1023, and 1123 K, and the flow rate was considered to be 5 L/min, 10 L/min, 20 L/min. High-performance camera which can film video at the speed of 60 frames per second was used to seize the ignition phenomena and volatile combustion process. The transformation of ignition mechanism between heterogeneous and homogeneous was found at 21% and 100% oxygen concentrations when the temperature was 923 K at a flow rate of 10 L/min, while the turning point changed to 30% and no more than 30% when the temperature was 1023 and 1123 K, respectively. Both the ignition delay and internal ignition temperature decreased with increasing temperature and oxygen concentration. The volatile combustion burnout time was decreased with increasing oxygen concentration, while the flame was observed only on the upper section of the pellet. Both increasing flow temperature and flow rate could increase the length of volatile flame, but increasing gas flow oxygen concentration shortened that.
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