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我国煤炭自燃火灾十分严重,严重威胁煤炭的开采、运输、储存等。煤炭自燃是煤低温氧化能力的体现,研究低温氧化环境下的煤体放热特性对抑制煤炭自燃具有重要意义。本文建立了基于程序温控的煤样通风实验装置,对煤样进行了程序温控下通入空气和通入氮气的实验研究,得出了煤样在不同气体状态下的升温规律;考虑到CO作为煤中碳氢氧化反应比较敏感的产物能够很好地反应煤低温氧化过程中的化学特性,本文还建立CO产生速率计算模型,该模型的建立将为煤的自燃预测预报提供理论依据。
China’s spontaneous combustion of coal fire is very serious, a serious threat to coal mining, transportation, storage and so on. Spontaneous combustion of coal is a manifestation of low temperature oxidative capacity of coal. It is of great significance to study the exothermic behavior of coal under low temperature oxidative environment to suppress spontaneous combustion of coal. In this paper, an experimental device for coal-based ventilation based on programmed temperature control was established. The experimental study on the air-through and nitrogen-passing of coal samples under programmed temperature control was carried out, and the law of temperature rise of coal samples under different gas states was obtained. CO, as a relatively sensitive product of CO oxidation in coal, can well reflect the chemical characteristics of low temperature oxidation of coal. A calculation model of CO production rate is also established in this paper. The establishment of this model will provide a theoretical basis for predicting coal spontaneous combustion.