基于COMSOL动态模型的采空区连续注氮模拟研究
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摘要
为明确煤矿采空区动态连续注氮的可行性及优点,以瑞安公司014N1-1综放工作面为例,使用COMSOL模拟软件建立采空区动态连续注氮模型,开展数值模拟研究,分析了采空区N2动态分布、最高温度变化规律,以及采空区氧化带宽度、工作面和采空区瓦斯及CO体积分数动态变化规律等。在动态注氮口距切顶线20 m、注氮量为360 m~3/h条件下,可以提高高浓度N2的连续分布效果,能显著降低采空区温度增长率、温度、氧化带宽度,还可有效降低采空区及工作面的瓦斯、CO体积分数。动态连续注氮不但能在小注氮量条件下有效防治煤炭自燃,还能治理工作面瓦斯及CO体积分数超限。
In order to clarify the feasibility and advantages of dynamic continuous nitrogen injection in goaf,taking 014 N1-1 fully mechanized working face of Rui'an Company as an example,a COMSOL simulation software was used to establish a dynamic continuous nitrogen injection model in goaf,numerical simulation studies were carried out to analyze the dynamic distribution of N2 in goaf,the change law of maximum temperature,the width of oxidation zone in goaf,the dynamic change law of volume fraction of gas and CO in the working face and goaf. The continuous distribution effect of high concentration N2 can be improved under the condition that the dynamic nitrogen injection port is 20 m away from the cutting top line and the nitrogen injection amount is 360 m~3/h,the growth rate of goaf temperature,temperature and width of oxidation zone were significantly reduced,and fraction of gas and CO volume in goaf and working face can be effectively reduced. Dynamic continuous nitrogen injection can not only effectively prevent coal spontaneous combustion under the condition of small amount of nitrogen injection,but also control the overlimit of gas and CO volume fraction in working face.
In order to clarify the feasibility and advantages of dynamic continuous nitrogen injection in goaf,taking 014 N1-1 fully mechanized working face of Rui'an Company as an example,a COMSOL simulation software was used to establish a dynamic continuous nitrogen injection model in goaf,numerical simulation studies were carried out to analyze the dynamic distribution of N2 in goaf,the change law of maximum temperature,the width of oxidation zone in goaf,the dynamic change law of volume fraction of gas and CO in the working face and goaf. The continuous distribution effect of high concentration N2 can be improved under the condition that the dynamic nitrogen injection port is 20 m away from the cutting top line and the nitrogen injection amount is 360 m~3/h,the growth rate of goaf temperature,temperature and width of oxidation zone were significantly reduced,and fraction of gas and CO volume in goaf and working face can be effectively reduced. Dynamic continuous nitrogen injection can not only effectively prevent coal spontaneous combustion under the condition of small amount of nitrogen injection,but also control the overlimit of gas and CO volume fraction in working face.
引文
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[17]董子文,刘爱群,齐庆杰,等.采场气体涌出与煤自燃的动态数值模拟研究[J].中国安全科学学报,2017,27(7):112-117.
[2]樊克松,申宝宏,王东攀,等.分层开采注氮置换上分层采空区瓦斯技术研究[J].煤炭科学技术,2017,45(1):106-111.
[3]石建丽,张人伟,毕言峰,等.注氮对综放工作面采空区瓦斯分布的影响分析[J].煤矿安全,2011,42(11):101-102.
[4]汪文革,袁奎.注氮条件下瓦斯抽采对采空区自燃“三带”的影响[J].煤炭科学技术,2014,42(12):75-78.
[5]马东,秦波涛.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.
[6]张春,题正义,李宗翔,等.注氮防治综放遗煤自燃的三维模拟及应用研究[J].安全与环境学报,2014,14(2):31-35.
[7]吴玉国,邬剑明,张东坡,等.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.
[8]尹晓雷,戴广龙,吴彬,等.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.
[9]秦跃平,刘伟,郝永江,等.采空区内埋“花管”注氮及效果研究[J].矿业安全与环保,2012,39(4):27-30.
[10]俞学平,高正强,汤晓东,等.提高注氮防灭火效果的技术应用研究[J].矿业安全与环保,2007,34(2):31-32.
[11]朱红青,刘星魁.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.
[12]朱红青,李峰,张振羽,等.连续式注氮防灭火装置动力参数[J].煤炭学报2012,37(7):1184-1189.
[13]朱红青,李峰,潘凤龙,等.连续式注氮防灭火工艺管路压力载荷研究[J].煤炭学报,2012,37(增刊2):351-356.
[14]朱红青,李峰,张悦,等.连续式注氮防灭火工艺的设计与惰化效果分析[J].煤矿安全,2013,44(2):175-178.
[15]李峰.连续式注氮防灭火理论及技术研究[D].北京:中国矿业大学(北京),2013.
[16]董子文.基于变形几何的动态采空区气体涌出及自燃烟花规律研究[D].阜新:辽宁工程技术大学,2016.
[17]董子文,刘爱群,齐庆杰,等.采场气体涌出与煤自燃的动态数值模拟研究[J].中国安全科学学报,2017,27(7):112-117.