氡在侏罗纪煤中运移规律的实验研究

发布时间：2018-08-05 14:15

【摘要】：为了掌握氡探测煤矿隐蔽火源的机理,运用自主设计的可控角度实验装置,以铀矿石为氡源,研究分析了氡在侏罗纪煤体中不同煤温条件下和不同方向上(β倾角)的运移规律。实验结果表明,氡在侏罗纪煤体中的运移具有方向性:同一煤温时,距氡源相同距离位置处的氡浓度值随β倾角的增加而增大;同一方向上,氡浓度值随距氡源距离的增加而减小,温度越高减小速率越快;同一位置处温度越高氡浓度值越大。计算出了不同煤温下和不同方向上氡在侏罗纪煤体中的运移系数、运移速度和运移总量,结果表明运移系数、运移速度和运移总量均随方向和温度的变化呈一定的变化规律,发现氡-氦团簇作用是氡在侏罗纪煤体中竖直运移的主导因素;运移系数、运移速度和运移量随β倾角的变化规律解释了氡在侏罗纪煤体中运移具有方向性的原因,对测氡法探测隐蔽火源位置具有一定的指导意义。
[Abstract]:In order to understand the mechanism of radon detecting hidden fire source in coal mine, using self-designed controlled angle experimental device and using uranium ore as radon source, the migration law of radon in different coal temperature and direction (尾 inclination angle) in Jurassic coal body is studied and analyzed. The experimental results show that the migration of radon in the Jurassic coal body is directional: at the same coal temperature, the radon concentration at the same distance from the radon source increases with the increase of 尾 inclination angle, and in the same direction, The radon concentration decreases with the increase of the distance from the radon source, the higher the temperature, the faster the rate of reduction, and the higher the radon concentration at the same location. The migration coefficient, velocity and total amount of radon in Jurassic coal body are calculated at different coal temperatures and in different directions. The results show that the migration coefficient, velocity and total amount of radon change with the direction and temperature. It is found that radon-helium cluster action is the dominant factor of vertical migration of radon in Jurassic coal bodies, and that the variation of migration coefficient, velocity and volume with 尾-inclination explains the directionality of radon migration in Jurassic coal bodies. It has certain guiding significance for radon detection to detect the location of hidden fire source.
【作者单位】：西安科技大学安全科学与工程学院;教育部西部矿井开采及灾害防治重点实验室;陕西煤矿安全监察局安全技术中心;
【基金】：国家自然科学基金(u1361129) 中国博士后基金(2016-M-592820)
【分类号】：TD752.2

【相似文献】