论文部分内容阅读
为研究煤自燃过程的煤氧反应特征,采用自行研制的绝热氧化试验系统对3种不同煤样进行绝热氧化试验。试验得出煤绝热氧化过程中煤氧反应并不都满足Arrhenius方程,温度的倒数(1/T)与升温速率的对数(1n(dT/dt))不完全是线性关系,存在位于低温(<70℃)与高温(>115℃或160℃)时期的非Arrhenius阶段。分析结果表明,煤绝热氧化低温时期出现非Arrhenius阶段是煤对氧气的物理与化学吸附造成的;高温时期出现的非Arrhenius阶段则是由于固定的氧气供给量与不断增加的需氧量的矛盾,以及煤氧有效接触面积受限导致的。
In order to study the characteristics of coal-oxygen reaction in spontaneous combustion of coal, three kinds of different coal samples were tested for adiabatic oxidation using a self-developed adiabatic oxidation test system. It is concluded that the coal-oxygen reaction does not all satisfy the Arrhenius equation during the adiabatic oxidation of coal. The reciprocal of the temperature (1 / T) is not completely linear with the logarithm of the heating rate (1n (dT / dt) <70 ℃) and high temperature (> 115 ℃ or 160 ℃) period of non-Arrhenius stage. The results show that the non-Arrhenius stage during the adiabatic oxidation of coal is caused by the physical and chemical adsorption of oxygen on the coal. The non-Arrhenius stage at high temperature is due to the conflict between the fixed oxygen supply and the increasing oxygen demand. As well as limited effective contact area of coal oxygen caused.