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为实现煤矿井下采掘工作面煤与瓦斯突出的非接触式预测预报,对煤中所含瓦斯解吸过程温度场的变化过程进行初步研究。应用红外热像仪分别对不同吸附平衡压力条件下煤含瓦斯解吸过程的温度场变化过程进行试验测量。用希尔伯特-黄变换对测量得到的原始红外辐射温度信号进行经验模态分解去噪,得到准确、有效的温度变化曲线。试验结果表明:煤体瓦斯的解吸是吸热过程,致使煤体本身温度下降。煤体瓦斯吸附平衡压力不同,煤体温度下降幅度也不相同,吸附平衡压力越高,温度下降幅度越大。对不同压力条件下煤体瓦斯解吸过程温度变化曲线进行拟合,所得曲线符合指数函数。
In order to realize the non-contact forecasting of coal and gas outburst in coal mining face, the change process of temperature field in coal desorption process is preliminarily studied. The infrared thermography was used to measure the temperature field of coal gas desorption under different adsorption equilibrium pressures. The Hilbert-Huang transform is used to decompose the measured original infrared radiation temperature signal by empirical mode decomposition to get an accurate and effective temperature curve. The experimental results show that the desorption of coal gas is an endothermic process, resulting in a decrease of the temperature of the coal itself. Coal gas adsorption equilibrium pressure is different, coal temperature drop is not the same, the adsorption equilibrium pressure is higher, the greater the temperature drop. The temperature curve of the coal gas desorption process under different pressure conditions was fitted, and the curve was in line with the exponential function.