工作面推进下采空区煤自燃进程的动态模拟研究
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摘要
提出了一种改进的非稳态模拟方法,用于分析工作面推进对采空区遗煤所处渗流和氧化环境的动态影响.基于所建立的模拟方法,模拟了耿村矿13210工作面不同推进距离下采空区渗流参数、氧气浓度和温度场的动态分布,并通过现场实测与模拟结果比对,验证了模拟方法的可行性.结果表明:该模拟方法实现了采空区煤自燃过程与工作面动态推进间的反演,发现采空区自燃危险区域随推进距离的增加呈现阶段化分布特征;当工作面推进90～120 m后,采空区渗透参数、氧气浓度的分布在滞后工作面一定范围内相对稳定,但温度场具有明显的拖尾降温现象.采空区动态尺度下的模拟更能体现采空区煤自燃过程与自燃危险区域分布,为动态推进下的采空区煤自燃预测提供了指导.
An unsteady state simulation method was proposed to analyze the dynamic effects of the working face on the seepage and oxidation environment of the coal in goaf. Based on the established simulation method, the dynamic distribution of seepage parameters, oxygen concentration and temperature field were simulated with different advancing distances at 13210 workface in Gengcun coal mine. The simulation method was shown to be correct by the comparison between the field measurement and the simulation results. The results show that the simulation method realizes the inversion between the process of spontaneous combustion of coal, It is found that the hazard area of spontaneous combustion of coal presents a staged distribution characteristic with the increasing of advance distance in goaf. After advancing 90～120 m, the seepage parameters and oxygen concentration distribution in goaf are relatively stable within a certain range lagging the working face, but the temperature field has an obvious trailing and cooling phenomenon. The dynamic scales simulation can reflect the process of spontaneous combustion and the distribution of oxidation danger zone, which provides guidance for predicting spontaneous combustion of coal in goaf with the different advancing scope and speed.
An unsteady state simulation method was proposed to analyze the dynamic effects of the working face on the seepage and oxidation environment of the coal in goaf. Based on the established simulation method, the dynamic distribution of seepage parameters, oxygen concentration and temperature field were simulated with different advancing distances at 13210 workface in Gengcun coal mine. The simulation method was shown to be correct by the comparison between the field measurement and the simulation results. The results show that the simulation method realizes the inversion between the process of spontaneous combustion of coal, It is found that the hazard area of spontaneous combustion of coal presents a staged distribution characteristic with the increasing of advance distance in goaf. After advancing 90～120 m, the seepage parameters and oxygen concentration distribution in goaf are relatively stable within a certain range lagging the working face, but the temperature field has an obvious trailing and cooling phenomenon. The dynamic scales simulation can reflect the process of spontaneous combustion and the distribution of oxidation danger zone, which provides guidance for predicting spontaneous combustion of coal in goaf with the different advancing scope and speed.
引文
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[12] 周佩玲,张英华,黄志安,等.非均质孔隙率采空区氧化升温规律四维动态模拟[J].工程科学学报,2016,38(10):1350-1358.ZHOU Peiling,ZHANG Yinghua,HUANG Zhian,et al.4D dynamic simulation of coal oxidation heating law in gobs with heterogeneous porosity[J].Chinese Journal of Engineering,2016,38(10):1350-1358.
[13] 夏同强.瓦斯与煤自燃多场耦合致灾机理研究[D].徐州:中国矿业大学,2015:55-71.XIA Tongqiang.Multi-physics coupling mechanism of co-existence hazards for coal spontaneous combustion and gas[D].Xuzhou:China University of Mining and Technology,2015:55-71.
[14] XIA Tongqiang,ZHOU Fubao,WANG Xinxin,et al.Controlling factors of symbiotic disaster between coal gas and spontaneous combustion in longwall mining gobs[J].Fuel,2016,182:886-896.
[15] 李品,褚廷湘,陈兴.工作面动态推进下采空区煤自燃分布特征模拟[J].中国安全生产科学技术,2017,13(10):122-127.LI Pin,CHU Tingxiang,CHEN Xing.Simulation on distribution characteristics of coal spontaneous combustion in goaf during dynamic advancing of working face[J].Journal of Safety Science and Technology,2017,13(10):122-127.
[16] 张思斯,王德禹.MSC Patran中基于Matlab插值函数的多场创建[J].计算机辅助工程,2008,17(3):8-12.ZHANG Sisi,WANG Deyu.Establishment of multi fields in MSC Patran by interpolation functions of Matlab[J].Computer Aided Engineering,2008,17(3):8-12.
[2] LU Wei,CAO Yingjiazi,TIEN J C.Method for prevention and control of spontaneous combustion of coal seam and its application in mining field[J].International Journal of Mining Science and Technology 2017,27(5):839-846.
[3] 朱建芳.动坐标下采空区自燃无因次模型及判别准则研究[D].北京:中国矿业大学(北京),2006:68-89.ZHU Jianfang.Study on the dimensionless mathematical model and criterion for spontaneous combustion in gob on the moving coordinates[D].Beijing:China University of Mining and Technology (Beijing),2006:68-89.
[4] 刘伟.采空区多场耦合自然发火机理及三维数值模拟研究[D].北京:中国矿业大学(北京),2014:32-46.LIU Wei.Multi-physics coupling mechanism and three-dimensional numerical simulation of spontaneous combustion of goaf[D].Beijing:China University of Mining and Technology (Beijing),2014:32-46.
[5] 何启林,王德明.综放面采空区遗煤自然发火过程动态数值模拟[J].中国矿业大学学报,2004,33(1):11-14.HE Qilin,WANG Deming.Numerical simulation of spontaneous combustion process in goaf areas by fully-mechanized and caving roof coal[J].Journal of China University of Mining & Technology,2004,33(1):11-14.
[6] 朱建芳,蔡卫,秦跃平.基于移动坐标的采空区自然发火模型研究[J].煤炭学报,2009,34(8):1095-1099.ZHU Jianfang,CAI Wei,QIN Yueping.Mathematical model for spontaneous combustion in goaf in the moving coordinates[J].Journal of China Coal Society,2009,34(8):1095-1099.
[7] 王月红.移动坐标下采空区自然发火的有限体积法模拟研究[D].北京:中国矿业大学(北京),2009:8-20.WANG Yuehong.Study on simulation of spontaneous combustion in gob on the moving coordinates with finite volume method[D].Beijing:China University of Mining and Technology (Beijing),2009:8-20.
[8] 李宗翔,衣刚,武建国,等.基于“O”型冒落及耗氧非均匀采空区自燃分布特征[J].煤炭学报,2012,37(3):484-489.LI Zongxiang,YI Gang,WU Jianguo,et al.Study on spontaneous combustion distribution of goaf based on the “O” type risked falling and non-uniform oxygen[J].Journal of China Coal Society,2012,37(3):484-489.
[9] 李宗翔,王晓冬,王波.采空区场流数值模拟程序(G3)实现与应用[J].湖南科技大学学报(自然科学版),2005,20(4):16-20.LI Zongxiang,WANG Xiaodong,WANG Bo.Realization and application of numerical simulation program (G3) for field flow of goaf[J].Journal of Hunan University of Science & Technology(Natural Science Edition),2005,20(4):16-20.
[10] 李宗翔,贾进章,李庆刚.动态推进工作面采空区自燃规律的数值模拟[J].矿业研究与开发,2005,25 (5):84-87.LI Zongxiang,JIA Jinzhang,LI Qinggang.Numerical simulation of the spontaneous combustion laws in goaf of boost working face[J].Mining Research and Development,2005,25 (5):84-87.
[11] 时国庆,胡方坤,王德明,等.采空区自燃“三带”分布规律的四维动态模拟[J].中国矿业大学学报,2014,43 (2) :189-194.SHI Guoqing,HU Fangkun,WANG Deming,et al.Unsteady simulation on distribution of three zones for spontaneous combustion in goaf areas[J].Journal of China University of Mining & Technology,2014,43 (2):189-194.
[12] 周佩玲,张英华,黄志安,等.非均质孔隙率采空区氧化升温规律四维动态模拟[J].工程科学学报,2016,38(10):1350-1358.ZHOU Peiling,ZHANG Yinghua,HUANG Zhian,et al.4D dynamic simulation of coal oxidation heating law in gobs with heterogeneous porosity[J].Chinese Journal of Engineering,2016,38(10):1350-1358.
[13] 夏同强.瓦斯与煤自燃多场耦合致灾机理研究[D].徐州:中国矿业大学,2015:55-71.XIA Tongqiang.Multi-physics coupling mechanism of co-existence hazards for coal spontaneous combustion and gas[D].Xuzhou:China University of Mining and Technology,2015:55-71.
[14] XIA Tongqiang,ZHOU Fubao,WANG Xinxin,et al.Controlling factors of symbiotic disaster between coal gas and spontaneous combustion in longwall mining gobs[J].Fuel,2016,182:886-896.
[15] 李品,褚廷湘,陈兴.工作面动态推进下采空区煤自燃分布特征模拟[J].中国安全生产科学技术,2017,13(10):122-127.LI Pin,CHU Tingxiang,CHEN Xing.Simulation on distribution characteristics of coal spontaneous combustion in goaf during dynamic advancing of working face[J].Journal of Safety Science and Technology,2017,13(10):122-127.
[16] 张思斯,王德禹.MSC Patran中基于Matlab插值函数的多场创建[J].计算机辅助工程,2008,17(3):8-12.ZHANG Sisi,WANG Deyu.Establishment of multi fields in MSC Patran by interpolation functions of Matlab[J].Computer Aided Engineering,2008,17(3):8-12.
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