低位放顶煤采空区自燃区域划分与注氮口位置确定

发布时间：2018-03-19 21:50

本文选题：煤自燃　切入点：注氮防灭火　出处：《煤炭科学技术》2017年02期 　论文类型：期刊论文

【摘要】：为了提高煤矿注氮防灭火技术的惰化效果,以塔山矿8202综放工作面为背景,通过布置束管和温度监测系统,连续监测采空区内各测点CO、O_2浓度和温度数据,绘制O_2浓度分布等值线图,拟合升温速率,判定划分采空区自然发火危险区域。结果表明:采空区进风侧距工作面30~170 m,回风侧距工作面30~220 m的区域为自燃危险区域,通过对比注氮流量为2 500 m~3/h时,注氮口位置(工作面后方50、100、150、200 m)对惰化效果的影响,发现对于低位放顶煤采空区,延伸注氮口位置于工作面后方150 m处时,自然发火危险区域缩短约60 m,采空区深部CO体积分数显著降低,并稳定为19×10~(-6)左右,稀释氧气惰化效果最佳。
[Abstract]:In order to improve the inert effect of nitrogen injection fire extinguishing technology in coal mine, taking 8202 fully mechanized caving face in Tashan Mine as background, the COO _ 2 concentration and temperature data of each measuring point in goaf are continuously monitored by arranging beam pipe and temperature monitoring system. Drawing the contours of O _ 2 concentration distribution, fitting the heating rate, judging the danger area of spontaneous combustion in goaf, the result shows that the area from the side of the goaf to the coal face is 30170m, and the area from the backwind side to the workface is the danger area of spontaneous combustion. By comparing the effect of nitrogen injection port position (50,100,150,200 m behind the face) on the inerting effect when the nitrogen injection flow rate is 2 500mt / 3 h, it is found that for the low caving coal caving goaf, the extended nitrogen injection hole position is 150m behind the working face. The spontaneous combustion danger area is shortened about 60 m.The volume fraction of CO in the deep part of the goaf is decreased significantly, and the volume fraction is stable to about 19 脳 10 ~ (10) ~ (-6), and the best effect is to dilute oxygen inerting.
【作者单位】：太原理工大学矿业工程学院;山西省安全工程技术研究中心;
【基金】：国家自然科学基金资助项目(51274146)
【分类号】：TD752.2

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