Characteristics of high temperature environment on coal pore structure and oxidation dynamics of Barapukuria coal mine in Bangladesh
In order to prevent coal spontaneous combustion disasters under high-temperature environment and clarify the spontaneous combustion characteristics,coal samples from the 1306 working face of the Ⅵ coal seam in Barapukuria coal mine were selected.The coal samples were subjected to constant temperature treatment at 40,50,and 60℃for 30 days,and pore structure analysis and thermogravimetry(TG)were performed on the raw coal samples and high-temperature pretreated coal samples to test the oxidation kinetic parameters.The results show that after high-temperature treatment,the proportion of small pores decreases while the proportion of medium pores and large pores increases.After treatment at 60℃,the specific surface area of the coal sample increases from 2.351 m2/g of raw coal to 3.285 m2/g,and the total pore volume increases from 0.007 88 mL/g of raw coal to 0.010 01 mL/g.In addition,compared with raw coal,the ignition temperature and burnout temperature of the coal sample significantly decreased after high-temperature treatment,and the maximum weight loss and the maximum weight loss rate increased by 6.1％and 23.3％,respectively.The calculation results of oxidation kinetics show that the activation energy and pre-exponential factor of the coal sample after high-temperature treatment are lower than those of the raw coal,indicating that the high-temperature environment significantly improves the oxidation reaction activity and increases the risk of spontaneous combustion of coal.
high ground temperaturepore structureoxidation dynamic characteristicsthermogravimetric(TG)coal spontaneous combustion
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