Meikuang Anquan (Jan 2023)
Analysis and optimization of coal spontaneous combustion index system
Abstract
In order to more accurately predict the development process of coal spontaneous combustion and take effective preventive measures in time, we used a self-developed temperature-programming experimental device, took fresh coal samples from Qingshuiying in Ningxia and Dafosi Coal Mines as the research objects, and obtained the gas volume fraction and gas components produced by two experimental coal samples at different oxidation temperatures, and analyzed the gas variation law of experimental coal samples at low temperature oxidation stage, and determined the characteristic temperatures of the two experimental coal samples. At the same time, three methods of multi-parameter index method, gas growth rate analysis method and Graham coefficient are used to comprehensively analyze and predict the oxidation process of experimental coal samples. The results show that the CO, CO2, CH4, C2H6, C2H4 gases are all positively correlated with temperature during the experiment; CO gas, CO2 gas, and the second fire coefficient R2 can be used as the main gas indicators for predicting the spontaneous combustion of the two experimental coal samples; CH4, C2H6, C2H4 gases, the first fire coefficient R1 and the third fire coefficient R3 are used as auxiliary gas indicators; the critical temperature of Qingshuiying coal sample is 60-80 ℃; dry cracking temperature is 110-125 ℃. The critical temperature of Dafosi coal sample is 60-75 ℃; the dry cracking temperature is 80-100 ℃.
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