Similar experimental study on non-linear oxidation heating up process of coal in dynamic gob areas

doi:10.16265/j.cnki.issn 1003-3033.2020.11.014

Abstract

Abstract: In order to explore deeper into oxidation heating characteristics of residual coal in gob areas, a similar experimental platform was built based on heat and mass transfer model which was established by volume average method. Nonlinear heating up process of such residual coal was studied and similar experiment results were verified by field test data. The results show that high temperature area mainly concentrates on air inlet side, and it will move forward along with advancing of working face while temperature in gob areas increase exponentially over time. Advancing speed of working face is a main factor that influences oxidation heating up process, the faster it is, the smaller heating rate of gob will be, and there is a negative exponential reduction relationship between it and maximum temperature in gob. Meanwhile, along with its increase, depth of maximum temperature point increase gradually. According to fitting curves of characteristic points' heating up in gob, it is also found that experimental results are basically consistent with that of field experiment, which proves rationality of similar experiment.

Key words: dynamic gob areas, oxidation heating up, similar experiment, spontaneous combustion of coal, working face advancing speed

ZHOU Peiling, YUAN Fei, ZHAO Pengxia. Similar experimental study on non-linear oxidation heating up process of coal in dynamic gob areas[J]. China Safety Science Journal, 2020, 30(11): 95-100.

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