Research On The Reaction Mechanism Function And The Thermal Characteristic Of Coal Oxidation

The oxidation and combustion of coal is a complex oxidative kinetics process, well known and master the regulation of oxidative kinetics is the key for understanding the mechanism of coals combustion. Therefore the Fourier transform infrared spectrometer and coal chemical knowledge were used in this article, through micro-structural testing and differential spectral analysis to detect the degree of oxidation of coal like the evolution of the internal structure of components, the process of coal spontaneous combustion which occurred in micro–process was learned by revealing the role of these active ingredients. In addition, the changes of TG, differential thermal (DTA), derivative thermogravimetry (DTG) were got by thermal analysis experiments of coal oxidation process, the TG curves of coal samples can be divided into different temperature ranges to carry on dynamics analysis to get its mechanism. Then the mechanism which has good linear was taken to the kinetic analysis of DSC curves to test, the same reaction mechanism function was applied to the process of TG and DSC curves, the mechanism function of gain weight belongs to one class chemical reaction. Decomposition's belongs to two class chemical reaction. This also explains the the mechanism function of coal oxidation process is correct. Through mechanism functions and other means, the activation energy which in the corresponding stage of coal oxidation process were discussed, there's different influence by several experimental conditions, such as heating rate, and sample volume. The interpretation of the different size of the spontaneous combustion of coal oxidation was derived by combination with the thermal effect results and the role of the active ingredient of infrared spectroscopy. In addition Coal's adiabatic oxidation simulative experiments were performed in large experimental apparatus to simulate the coal's oxidation process, the critical self-ignition temperature, airflow and heat transfer effects were particularly inspected. Based on the knowledge of previous chapters, the properties of coal's spontaneous combustion were discussed, and the laws of the coal's spontaneous combustion were explained.