含瓦斯煤解吸过程煤体温度场变化红外测量研究

Infrared Measurement of Coal Temperature Field Variation in Coal Gas Desorption Process

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 non-contact prediction of coal and gas outburst in working face, the change of coal temperature field in coal gas desorption process was studied. The temperature field variation in process of coal gas desorption under different pressure was analyzed by using of an infrared thermal imager. Coal accurate and effective temperature change curves were obtained after Empirical Mode Decomposition was used to denoising original infrared radiation temperature signals with Hilbert-Huang Transform. The results show that desorption process of gas from coal is an endothermic process, that coal body temperature drop range is different when coal gas adsorption equilibrium pressure is different, that higher adsorption equilibrium pressure, the greater of temperature drop is, and that temperature variation curves in process of coal gas desorption under different pressure were fitted, it meets exponential function.