基于耗氧量的煤低温氧化反应活化能研究

煤的低温氧化是一个非常复杂的过程,在不同的温度阶段存在不同的反应过程。活化能是研究煤低温氧化的一个重要的动力学参数。利用煤氧化过程中耗氧量求解煤低温氧化的表观活化能。通过程序升温实验测定了2种不同煤样的耗氧量随温度的变化关系,然后根据阿伦尼乌斯方程经线形处理发现煤在不同氧化阶段的活化能存在差异。煤氧刚接触时,主要发生物理吸附且吸附过程迅速导致活化能较小;随着温度升高,化学过程占据主导,活化能变大。

The Research on Activation energy of Coal Oxidation at Low Temperature Based on Oxygen Consumption

The low-temperature oxidation of coal is a very complicated process. There are different reactions at different temperature. Activation energy is an important kinetic parameter to study the low-temperature oxidation of coal. In this paper,the apparent activation energy was calculated based on oxygen consumption during the process of coal oxidation at low temperature. The relationships between oxygen consumption and temperature of two different kinds of coal were obtained by temperature-programmed experiments. And then according to Arrhenius equation activation energy is different at different stages of coal oxidation by the linear handling. Oxygen new to coal,the dominant physical absorption and quick adsorption process lead to smaller activation energy. As the temperature increases,the chemical adsorption enhances and the activation energy rises.