Abstract
ABSTRACT There were contradictory results about the effect of particle size on coal combustion during thermogravimetric (TG) experiments in previous reported papers. For the ascertainment of the actual role of particle size, three samples of group A coal from Huainan Mining area with a range of 60–100 mesh, 100–200 mesh, and less than 200 mesh, respectively, were prepared. They were characterized by proximate analysis, ultimate analysis, and TG experiments with different heating rates (5, 10, 20, and 40°C/min). The proximate and ultimate analyses indicated that group A coal has a characteristic with ultra-low content of moisture, extremely low content of ash, medium-high content of volatiles, and special low content of total sulfur. TG results showed that the whole combustion process of group A coal can be divided into four typical stages and includes seven characteristic temperatures. Based on TG results, the kinetic parameter of the combustion reaction was analyzed using Coast-Rdefern and Flynn-Wall-Ozawa methods. It showed that the group A coal is belonged to the easy spontaneous combustion coal seam, and the tendency of spontaneous combustion increases with a decrease in particle size in the whole range.
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