School of Mine Safety Engineering, North China Institute of Science and Technology
School of Resources & Civil Engineering, Northeastern University

为了研究不同粒径煤在氧化自燃过程中的特性，利用差示扫描量热技术（DSC）对内蒙古察哈素煤矿褐煤，研究了不同升温速率下，煤的颗粒度大小对DSC曲线峰值和临界特征温度的影响规律，并对活化能定量分析。结果表明：相同升温速率条件下，煤峰值温度与临界温度随煤样粒径减小呈降低趋势；相同粒径的煤样其峰值温度、临界温度及峰值面积随升温速率的升高呈现上升趋势；在小于0.50 mm粒状煤样范围内，粒径越大、升温速率大所对应的临界温度越高；采用Arrhenius公式法对煤样活化能进行求解得到，0.15～0.25 mm粒径煤样所对应的吸热量变化率最大，活化能最小，该粒径范围内的煤到达活化状态所需的能量最少，煤自燃倾向最大。

To study the characteristics of coal with different particle sizes in the process of oxidation and spontaneous combustion, differential scanning calorimetry (DSC) was used to study the lignite from Chahasu Coal Mine, Inner Mongolia. The influence of coal particle size on the peak and critical characteristic temperature under different heating rates was studied, and the activation energy was quantitatively analyzed. The results show that the peak temperature and critical temperature of coal decrease with the decrease of particle size under the same heating rate. The peak temperature, critical temperature, and peak area of coal with the same particle size increase with the increase in heating rate. In the range of less than 0.50 mm granular coal sample, the larger the particle size, the higher the critical temperature corresponding to the larger heating rate; the Arrhenius formula method is used to solve the activation energy of coal samples. The change rate of heat absorption of coal samples with 0.15-0.25 mm particle size is the largest and the activation energy is the smallest. The coal in this particle size range needs the least energy to reach the activation state, and the possibility of spontaneous combustion of coal samples is the largest.

国家自然科学基金资助项目（52274200）；河北省自然科学基金资助项目（E2018508089）；河北省教育厅资助项目（2018GJJG474）；

1 实验部分
2 实验结果
2.1 实验结果分析
2.2 DSC曲线特征温度分析
3 活化能的氧化热动力求解
4 结语

LIU Boxiong, MA Shangquan, ZHANG Chao, et al. Study on the influence of particle size and heating rate on characteristic temperature and activation energy of coal oxidation[J]. Safety in Coal Mines, 2023, 54（11）: 77−83.