高瓦斯易自燃煤层高抽巷瓦斯抽采与浮煤自燃耦合研究  

Study on Coupling of Gas Drainage and Floating Coal Spontaneous Combustion in High Gas Drainage Roadway of Coal Seam with High Gassy and Spontaneous Combustion

作　　者：杜瀚林 于贵生 DU Hanlin;YU Guisheng(China Coal Technology and Engineering Group Shenyang Research Institute,Shenyang 110016,China;State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China)

机构地区：[1]煤科集团沈阳研究院有限公司,辽宁沈阳110016 [2]煤矿安全技术国家重点实验室,辽宁抚顺113122

出　　处：《煤矿安全》2019年第12期163-169,共7页Safety in Coal Mines

摘　　要：运用FLUENT数值模拟方法对采空区三维耦合场进行研究,简要概括FLUENT流体数值模拟软件基本理论,通过对FLUENT进行自行编程,利用开发模型对杉木树煤矿N3062工作面采空区三位耦合场进行模拟分析,得到漏风流场分布规律。通过理论分析,确定散热带与自燃带分界线处氧浓度降低值,进而准确判定高瓦斯易自燃煤层采空区“自燃带”范围,并通过预先铺设在采空区中的光纤测温系统进一步判定采空区“自燃带”范围。利用实测采空区“自燃带”范围验证数值模拟采空区流场分布准确性,进一步对不同高抽负压条件下采空区自燃带宽度进行模拟,并结合现场实测不同高抽负压条件下回风巷瓦斯浓度及瓦斯抽采率的变化,确定最佳高抽负压范围。最后,采空区三维耦合场数值模拟结果也表明自燃“三带”呈现立体分布,在紧邻支架后部上方位置存在一个自燃发火危险区域。FLUENT numerical simulation method is used to study the three-dimensional coupled field of goaf.The basic theory of FLUENT fluid numerical simulation software is briefly summarized.Through the self-programming of FLUENT,the development model is used to couple the three-position of the goaf of N3062 working face in Sanmu Coal Mine.The field is simulated and analyzed to obtain the distribution laws of the leakage flow field.Through theoretical analysis,we determine the oxygen concentration reduction value at the boundary between the heat dissipation zone and the spontaneous combustion zone,and then accurately determine the“self-ignition zone”range of the high gassy spontaneous combustion coal seam goaf,further determine range of“spontaneous combustion zone”in goaf by optical fiber temperature measurement system laid in goaf.The accuracy of the flow field distribution in the goaf is verified by the“self-ignition zone”of the measured goaf,and the width of the spontaneous combustion zone in the goaf under different high suction and negative pressure conditions is further simulated,combined with the field measurement of different high suction negative pressure conditions.The change of gas concentration and gas drainage rate in the lower return air passage determines the optimal high suction negative pressure range.Finally,the numerical simulation results of the three-dimensional coupled field in the goaf also show that the“three belts”of the spontaneous combustion show a threedimensional distribution,and there is a spontaneous combustion danger zone near the rear of the support.

关 键 词：采空区三维耦合场 自燃三带 高抽负压 瓦斯抽放 FLUENT数值模拟 

分 类 号：TD713[矿业工程—矿井通风与安全]