Study on thermal characteristics of coal spontaneous combustion in gas atmosphere by TG-DSC coupling techniques

doi:10.16265/j.cnki.issn1003-3033.2019.11.013

Abstract

Abstract: To characterize the thermal characteristics of coal spontaneous combustion in gas atmosphere, the thermal gravimetric analysis and differential scanning calorimetry (TG-DSC) were used to study the process of coal spontaneous combustion under different gas volume fractions. The change of parameters such as characteristic temperature, weight loss and heat release of coal spontaneous combustion under the influence of gas were analyzed. The dynamic parameters of weight gain and combustion stages of coal in gas atmosphere were obtained. The results show that with the increase of gas volume fraction, the weight loss and heat release decrease and the coal-oxygen recombination rate slowes, that the process of coal spontaneous combustion is divided into three stages: evaporation desorption, weight gain and combustion, that activation energy and activation factor increase with the increase of gas volume fraction in the low temperature oxidation stage of coal, but the whole change is not obvious, and that activation energy and activation factor decrease with the increase of gas volume fraction in the combustion stage of coal.

Key words: coal spontaneous combustion, gas atmosphere, characteristic temperature, thermal properties, activation energy, activation factor

CLC Number:

X932

LOU Hezhuang, JIA Tinggui. Study on thermal characteristics of coal spontaneous combustion in gas atmosphere by TG-DSC coupling techniques[J]. China Safety Science Journal, 2019, 29(11): 77-82.

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