淮南矿区典型煤样自燃特性热重-红外联用实验研究

TG-FTIR Study on the Spontaneous Combustion Characteristics of Typical Coal Samples from Huainan Mining Area

为降低煤矿安全事故发生风险,针对煤自燃氧化出现紧急危险性等问题,研究淮南矿区典型煤样的自燃特性。以淮南张集煤矿6、8、11-2和13-1煤样为例,通过热重-红外(TG-FTIR)联用技术分析煤样在升温氧化过程中的质量变化和气相产物析出特性。实验结果表明:四种煤样的升温氧化过程均可分为5个阶段,包含6个特征温度点;燃烧阶段各煤样反应活化能按由大到小排序为6煤、8煤、11-2煤、13-1煤;主要气相产物吸收峰强度按由高到低排序为13-1煤、11-2煤、8煤、6煤;根据活化能大小和主要气相产物吸收峰强度判断各煤样自燃风险按由高到低排序为13-1煤、11-2煤、8煤、6煤。本文结果可为类似矿区矿井火灾防治提供基础理论支撑。

In order to reduce the risk of coal mine accidents,the spontaneous combustion character-istics of typical coal samples in Huainan mining area are studied.With four coal samples of 6,8,11-2 and 13-1 from Huainan Zhangji Coal Mine as examples,the mass changes and the characteristics of gas-phase product precipitation of the coal samples are analyzed by thermogravimetric-infrared(TG-FTIR)coupling technology in the process of heating and oxidation.The experimental results show that the four coal samples can be divided into five stages,including six characteristic temperature points;and the activation energies of the coal samples during the combustion stage are 6,8,11-2 and 13-1 coal in descending order,and the intensities of absorption peaks of the main gas-phase products are 13-1,11-2,8 and 6 coal in descending order;and according to the activation energy and the intensity of the absorption peaks of the main gas phase products,the risk of spontaneous combustion of each coal sample was ranked from high to low as 13-1,11-2,8 and 6 coal.This paper can provide basic theoretical support for the prevention and control of mine fires in similar mining areas.