Study on Mechanism of Influence of Microstructure on Combustion Characteristics of Mine Conveyor Belt
Wei Wang, Yuntao Liang, Qiankun Zhao, Peng Li, Weidong Wang
Abstract
The disaster regularity of conveyor belt fire has always been the focus of mine fire prevention and control. In order to study the pyrolysis and combustion characteristics of different types of conveyor belts, the BET model was used to calculate the specific surface area and pore size distribution of conveyor belts. Various chemical bonds or functional groups contained in different types of conveyor belts were tested by infrared spectrum, and the structural parameters of infrared spectrum were calculated by split-peak fitting, so as to quantitatively analyze the change rule of the content of each active functional group. The microscopic morphology and element information of different types of conveyor belts were systematically studied by means of scanning electron microscope and energy spectrum analysis, which laid the foundation for the pyrolysis and combustion experiments of conveyor belts. The experimental results show that the order of specific surface area and average pore size is NFR>SC>PVC>PVG; The degree of hydroxyl oxidation of NFR and lignite samples is higher, and the degree of fat branching of NFR and PVG samples is higher, indicating that the samples have less soluble organic matter and loose structure; SC and NFR powder have similar internal space structure, but NFR conveyor belt has more hole structure than SC conveyor belt; The biggest difference between conveyor belt and lignite is the existence of Cl element. The derivative of Cl element can be considered as an early warning indicator of conveyor belt combustion.