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煤自燃低温氧化过程分为缓慢氧化阶段和快速氧化阶段,为研究内在因素对煤自燃低温临界温度的影响,首先在理论分析的基础上确定了挥发分、灰分、固定碳和C、N、S、H、O元素含量8个基础内因参数以及TJR、TCO和TO23个煤自燃低温临界温度表征参数,然后对7个煤样纯氧气氛下40~180℃的自热升温特征和空气气氛下30~180℃的气体释放进行实验测试,得到基础内因参数及表征参数数值,比较了不同表征参数间及基础内因参数间的关系.在灰色关联度分析的基础上,筛选出5个关联度高的基础内因参数与表征参数进行数学公式拟合.结果表明:3个煤自燃低温临界温度表征参数从升温、CO释放以及耗氧角度表现临界状况,数值大小虽有差异,但趋向性一致、相互印证;煤自燃低温临界温度与煤中挥发分和H、O元素含量负相关,与S元素含量关系不确定,其它因素对其影响小.
In order to study the influence of inherent factors on the critical temperature of coal spontaneous combustion, the low temperature oxidation process of coal spontaneous combustion is divided into slow oxidation stage and rapid oxidation stage. Firstly, volatile, ash, fixed carbon and C, N and S are determined on the basis of theoretical analysis , H, O element content of 8 basic intrinsic parameters and TJR, TCO and TO23 coal spontaneous combustion critical temperature characterization parameters, and then seven coal-like pure oxygen atmosphere 40 ~ 180 ℃ self-heating characteristics and the air atmosphere 30 ~ 180 ℃ gas release experiments were conducted to obtain the basic internal and external parameters and characterization of the value of the parameters were compared between the different characterization of the parameters and the relationship between the basic internal parameters based on the gray correlation analysis of five high correlation The results show that the critical parameters of the low temperature critical temperature of three coal spontaneous combustion show the critical condition from the aspects of heating temperature, CO release and oxygen consumption angle, although the values are different, but the trend is the same, confirming each other The critical temperature of spontaneous combustion of coal is negatively correlated with the content of V, H and O in coal, but not with the content of S, while the other factors have little effect on it.