低位放顶煤采空区自燃区域划分与注氮口位置确定  

Division of spontaneous combustion dangerous region and determination of nitrogen injection position in goaf of low level top coal caving mining face

作　　者：曹镜清 邬剑明[1,2] 周春山[1,2] 唐一博[1,2] 

机构地区：[1]太原理工大学矿业工程学院,山西太原030024 [2]山西省安全工程技术研究中心,山西太原030024

出　　处：《煤炭科学技术》2017年第2期89-94,共6页Coal Science and Technology

基　　金：国家自然科学基金资助项目(51274146)

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。In order to improve the inerting effect of the mine nitrogen injection technology,based on No.8202 fully-mechanized top coal caving mining face in Tashan Mine as a background,the layout of the bean tube and temperature monitoring and measuring system was applied to continuously monitor and measure the CO、O_2concentration and temperature of each measuring point in the goaf.The O_2 concentration distribution contour map was drawn,the temperature rising rate was fitted and the spontaneous combustion danger area was determined and divided.The results showed that the area with a distance of 30 ~ 170 m between the air intake side of the goaf and the coal mining face and the area with a distance of 30 ~ 220 m between the air retuning side and the coal mining face were the spontaneous combustion danger areas.With the comparisons,when the nitrogen injection flow was 2 500 m^3/h,the location of the nitrogen injection hole（50 m,100 m,150 m and 200 m behind the coal mining face was affected to the inerting effect.In the low level top coal caving goaf,when the location of the nitrogen injection hole was 150 m behind the coal mining face,the spontaneous combustion danger area was reduced about 60 m.In the deep section of the goaf,the CO volume fraction was obviously reduced and was stabilized about 19×10-6.The inerting effect of the diluent oxygen was the best.

关 键 词：煤自燃 注氮防灭火 温度监测 自燃危险区域 

分 类 号：TD75[矿业工程—矿井通风与安全]