低位放顶煤采空区自燃区域划分与注氮口位置确定
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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.
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.
引文
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[12]余明高.基于Matlab采空区自燃“三带”的分析[J].煤炭学报,2010,35(4):600-604.Yu Minggao.Analysis of spontaneous combustion“three-zone”in goaf based on Matlab[J].Journal of China Coal Society,2010,35(4):600-604.
[13]张人伟,贺晓刚,孙勇,等.朱仙庄矿综放面采空区“三带”范围的确定及应用[J].采矿与安全工程学报,2008,25(3):332-336.Zhang Renwei,He Xiaogang,Sun Yong,et al.Determination of three-zone in goaf on fully-mechanized face in Zhuxianzhuang Coal Mine and its application[J].Journal of Mining&Safety Engineering,2008,25(3):332-336.
[14]叶正亮.双指标划分采空区自燃“三带”的数值模拟[J].煤矿安全,2012,43(3):1-5.Ye Zhengliang.Numerical simulation of dividing gob spontaneous combustion“Three-zones”by double index method[J].Safety in Coal Mines,2012,43(3):1-5.
[15]杨胜强.采空区自燃“三带”微循环理论及漏风流场数值模拟[J].中国矿业大学学报,2009,38(6):769-773.Yang Shengqiang.The“three zones”microcirculation theory of goaf spontaneous combustion and a numerical simulation of the air leakage flow field[J].Journal of China University of Mining&Technology,2009,38(6):769-773.
[2]蒋仲安.综采工作面采空区封闭与惰化防灭火技术的数值模拟[J].北京科技大学学报,2014,36(6):722-729.Jiang Zhongan.Numerical simulation of goaf sealing and inerting fire-fighting technology for fully mechanized coal faces[J].Journal of University of Science and Technology Beijing,2014,36(6):722-729.
[3]朱红青.顶煤自燃危险性分析及注氮防火的理论研究[J].煤炭学报,2012,37(6):1015-1020.Zhu Hongqing.Investigation into spontaneous combustion hazard and numerical simulation of nitrogen injection fire prevention effects in the roof coal[J].Journal of China Coal Society,2012,37(6):1015-1020.
[4]董军.综放工作面采空区连续注氮防灭火工艺参数仿真优化[J].煤矿安全,2016,47(7):186-189.Dong Jun.Simulation optimization of process parameters for fire prevention by continuous nitrogen injection in goaf of fully mechanized caving face[J].Safety in Coal Mines,2016,47(7):186-189.
[5]徐永亮.注氮对采空区松散煤体中气体分布的影响[J].煤矿安全,2013,44(5):22-25.Xu Yongliang.The effect of nitrogen injection on gas distribution in the loose coal of goaf[J].Safety in Coal Mines,2013,44(5):22-25.
[6]吴玉国.综放工作面连续注氮下采空区气体分布及“三带”变化规律[J].煤炭学报,2011,36(6):964-967.Wu Yuguo.Distribution law of gas and change rule of“three zones”in the goaf of fully mechanized top-coal caving working face under the continuous nitrogen injection[J].Journal of China Coal Society,2011,36(6):964-967.
[7]李宗翔.综放采空区防灭火注氮数值模拟与参数确定[J].中国安全科学学报,2003,13(5):53-57.Li Zongxiang.Numerical simulation and parameter determination of nitrogen injection process in fire prevention and extinguishing in fully mechanized longwall top-coal goaf[J].China Safety Science Journal,2003,13(5):53-57.
[8]何宗礼.U型通风采空区注氮参数优选[J].中国安全生产科学技术,2013,9(7):32-37.He Zongli.Optimization of nitrogen inject parameter for U-shaped ventilation goaf[J].Journal of Safety Science and Technology,2013,9(7):32-37.
[9]尹晓雷.综采面动态注氮作用下采空区“三带”分布及防灭火技术研究[J].中国安全生产科学技术,2014,10(10):137-142.Yin Xiaolei.Research on distribution law of“three zones”in goaf of full-mechanized mining face and fire prevention technology under the action of dynamic nitrogen injection[J].Journal of Safety Science and Technology,2014,10(10):137-142.
[10]马东.综放工作面采空区注氮量与氧化自燃带分布关系[J].煤炭科学技术,2016,44(4):78-82.Ma Dong.Relationship between oxidized spontaneous combustion zone and nitrogen injection quantity in goaf of fully-mechanized coal caving mining face[J].Coal Science and Technology,2016,44(4):78-82.
[11]刘星魁.采空区注氮参数设计及三维流场分析[J].太原理工大学学报,2015,46(3):312-317.Liu Xingkui.Nitrogen injection parameters design for goaf and its3D flow field analysis[J].Journal of Taiyuan University of Technology,2015,46(3):312-317.
[12]余明高.基于Matlab采空区自燃“三带”的分析[J].煤炭学报,2010,35(4):600-604.Yu Minggao.Analysis of spontaneous combustion“three-zone”in goaf based on Matlab[J].Journal of China Coal Society,2010,35(4):600-604.
[13]张人伟,贺晓刚,孙勇,等.朱仙庄矿综放面采空区“三带”范围的确定及应用[J].采矿与安全工程学报,2008,25(3):332-336.Zhang Renwei,He Xiaogang,Sun Yong,et al.Determination of three-zone in goaf on fully-mechanized face in Zhuxianzhuang Coal Mine and its application[J].Journal of Mining&Safety Engineering,2008,25(3):332-336.
[14]叶正亮.双指标划分采空区自燃“三带”的数值模拟[J].煤矿安全,2012,43(3):1-5.Ye Zhengliang.Numerical simulation of dividing gob spontaneous combustion“Three-zones”by double index method[J].Safety in Coal Mines,2012,43(3):1-5.
[15]杨胜强.采空区自燃“三带”微循环理论及漏风流场数值模拟[J].中国矿业大学学报,2009,38(6):769-773.Yang Shengqiang.The“three zones”microcirculation theory of goaf spontaneous combustion and a numerical simulation of the air leakage flow field[J].Journal of China University of Mining&Technology,2009,38(6):769-773.