College of Safety Science and Engineering, Xi’an University of Science and Technology
Shaanxi Key Laboratory of Prevention and Control of Coal Fire, Xi’an University of Science and Technology
Guizhou Jinsha Longfeng Coal Industry Co., Ltd.

为研究贵州龙凤煤矿采空区遗煤自燃特性,首先采用同步热分析(TG-DSC)试验装置,测试该矿无烟煤在不同升温速率和氧气浓度条件下特征温度和放热量的变化规律,然后使用Coats-Redfern积分公式定量分析活化能。结果表明:相同氧气浓度条件下,煤样特征温度点均随升温速率增大呈升高趋势;相同升温速率的煤样其特征温度点T2随氧气浓度的增大出现波动性变化,T3先增加后降低,而T1、T4、T5和T6则逐渐降低;随着升温速率的增大,煤样放热峰值、峰值温度及放热量逐渐增加;煤样初始放热温度和峰值温度随氧气浓度的增大而减小,而放热峰值和放热量则先增加后降低,并在15%氧气浓度时达到最大;煤样受热分解/燃烧阶段的最概然机理函数符合n=4的A-E方程,在21%氧气浓度、不同升温速率下的活化能分别为141.18,129.84,118.03,102.05,84.38kJ/mol,随升温速率升高而降低,而在10K/min升温速率、不同氧气浓度下的活化能分别为85.24,97.79,114.51,125.18,129.84kJ/mol,随氧气浓度升高而增大。试验结果为该矿的煤自燃防治提供了理论依据。

In order to study the spontaneous combustion characteristics of residual coal in the goaf of Longfeng Coal Mine in Guizhou, the simultaneous thermal analysis( TG -DSC) experimental device was used to test the variation of the characteristic temperature and heat release of anthracite in the mine at different heating rates and oxygen concentrations, then Coats-Redfern integral formula was used to quantitatively analyze the activation energy. The results show that at the same oxygen concentration, the characteristic temperature points of coal samples increase with the increase of heating rate. The charac- teristic temperature point T2 of coal samples with the same heating rate fluctuates with the increase of oxygen concentration. T3 increases first and then decreases, but T1, T4, T5 and T6 decrease gradually. With the increase of heating rate, the peak value of heat release, peak temperature and heat release of coal samples gradually increase. The initial exothermic temperature and peak temperature of coal sam- ples decrease with the increase of oxygen concentration, but the exothermic peak and heat release first increase and then decrease, reaching the maximum at 15% oxygen concentration. The most probable mechanism function of the thermal decomposition / combustion stage of the coal sample conforms to the A - E equation of n = 4. The activation energies of the coal sample at 21% oxygen concentration and different heating rates are 141. 18, 129. 84, 118. 03, 102. 05 and 84. 38 kJ/ mol, respectively, which de- crease with the increase of heating rate. The activation energies of the coal sample at 10 K/ min heating rate and different oxygen concentrations are 85. 24, 97. 79, 114. 51, 125. 18 and 129. 84 kJ/ mol, re- spectively, which increase with the increase of oxygen concentration. The experimental results provide a thoretical basis for the prevention and control of coal spontaneous combustion in the mine.

国家自然科学基金项目(52074215);贵州省科技支撑项目(黔科合支撑〔2022〕一般011;黔科合支撑〔2023〕一般273)

邓军,周廷斌,游先中,等.贵州龙凤煤矿无烟煤自燃特性及动力学参数[J].西安科技大学学报,2024,44(3):409-417.

DENG Jun, ZHOU Tingbin, YOU Xianzhong, et al. Spontaneous combustion characteristics and kinetic parameters of anthracite inGuizhou Longfeng Coal Mine[ J] . Journal of Xi’an University of Science and Technology, 2024, 44( 3) : 409-417.