基于活化能计算的煤低温氧化特征与临界点预测
发布时间：2019-02-27 16:19
【摘要】：为探究煤自燃过程的反应特征与预测煤自燃临界温度,对5种煤样进行了绝热氧化实验,采用煤样活化能指标在实验不同时间段的变化情况来表征煤低温氧化内在特征。然后运用线性回归性分析模型中线性显著性检验来确定临界温度点Tc。结果表明:实验初期煤样活化能波动范围极大,随着温度升高活化能趋于稳定,在实验后期,各煤样求得的活化能均处于55~70kJ/mol范围内,反映了煤低温氧化反应是由不稳定逐步过渡到相对稳定的过程;Tc与宏观升温速率突变范围相符合,验证了模型的准确性;同时Tc与实验中自热温度达到160℃所需时间t0自发呈线性关系,因此可以用绝热氧化装置测得t0来预测煤自燃临界点。研究成果可以对矿区防灭火和煤炭储运管理工作提供借鉴。
[Abstract]:In order to explore the reaction characteristics of coal spontaneous combustion process and predict the critical temperature of coal spontaneous combustion, adiabatic oxidation experiments were carried out on five kinds of coal samples. The intrinsic characteristics of low temperature oxidation of coal were characterized by the change of activation energy index of coal samples in different time periods of the experiment. Then the critical temperature point Tc. is determined by linear significance test in the linear regression analysis model. The results show that the activation energy of coal samples fluctuates greatly at the initial stage of the experiment, and the activation energy tends to be stable with the increase of temperature. At the later stage of the experiment, the activation energies obtained from each coal sample are in the range of 55~70kJ/mol. The results show that the low temperature oxidation of coal is a process of transition from instability to relative stability. The Tc is consistent with the abrupt range of macro-heating rate, and the accuracy of the model is verified. At the same time, there is a linear relationship between Tc and the time of self-heating temperature of 160 鈩，
本文编号：2431423
[Abstract]:In order to explore the reaction characteristics of coal spontaneous combustion process and predict the critical temperature of coal spontaneous combustion, adiabatic oxidation experiments were carried out on five kinds of coal samples. The intrinsic characteristics of low temperature oxidation of coal were characterized by the change of activation energy index of coal samples in different time periods of the experiment. Then the critical temperature point Tc. is determined by linear significance test in the linear regression analysis model. The results show that the activation energy of coal samples fluctuates greatly at the initial stage of the experiment, and the activation energy tends to be stable with the increase of temperature. At the later stage of the experiment, the activation energies obtained from each coal sample are in the range of 55~70kJ/mol. The results show that the low temperature oxidation of coal is a process of transition from instability to relative stability. The Tc is consistent with the abrupt range of macro-heating rate, and the accuracy of the model is verified. At the same time, there is a linear relationship between Tc and the time of self-heating temperature of 160 鈩，
本文编号：2431423
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