煤屑瓦斯全程扩散规律的实验研究

Experimental study on gas diffusion law from drill cuttings during the whole desorption process

为深入探讨煤屑瓦斯全程扩散规律,基于传感器及计算机数据采集技术,运用瓦斯流量测定装置,完整测定了煤屑瓦斯在整个解吸期间的扩散过程;利用Matlab曲线拟合工具,对实验数据进行分析,得出了煤屑瓦斯全程扩散规律曲线。研究表明:煤屑瓦斯流量在扩散瞬间达到峰值,此后随时间的延长逐渐衰减,最终无限趋近于0;煤样罐内"死空间"的存在导致峰值出现,其出现时刻与喷口面积有关;在区间(0,t)内,扩散曲线存在一条水平渐近线Qv=0,但少数学者提出的铅直渐近线并不存在。

Based on sensor and computer data acquisition technology,gas diffusion law during the whole desorption process was measured by using measuring device of gas flow from drill cuttings;then test data was analyzed by using curve fitting toolbox of Matlab,curves of gas diffusion law were acquired.Research results show that gas flow from drill cuttings achieves maximum value as soon as diffusion process begins,flow crest appears at the same time,and then attenuates to zero gradually.Dead space results in the appearance of flow crest,whose appearance time has relation to spout area of coal sample container.At interval between zero to t,curves of gas diffusion law occur a horizontal asymptote（viz.Qv=0）,but the vertical asymptote which proved by few researchers doesn＇t occur.