基于采空区流场的遗煤自燃危险区域判定及复合惰化技术研究  

Research on dangerous area determination of spontaneous combustion of residual coal and compound inerting technology based on flow field in goaf

作　　者：牛阔 杜文州[1,2] 王厚旺 张延松 NIU Kuo;DU Wenzhou;WANG Houwang;ZHANG Yansong(College of Safety and Environmental Engineering,Shandong University of Science and Technology,Qingdao 266590,China;State Key Laboratory of Mine Disaster Prevention and Control of the Ministry of Education,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]山东科技大学安全与环境工程学院,山东青岛266590 [2]山东科技大学矿山灾害预防控制省部共建国家重点实验室培育基地,山东青岛266590

出　　处：《矿业安全与环保》2021年第1期23-27,共5页Mining Safety & Environmental Protection

基　　金：山东省自然科学基金项目(ZR2020QE131);国家自然科学基金面上项目(51974179)。

摘　　要：采空区遗煤自燃火灾是影响煤炭生产安全的主要灾害之一。基于Fluent数值模拟技术,构建采空区三维物理模型,模拟研究了采空区流场立体分布规律,并以O2体积分数为判别指标划分了采空区遗煤自燃危险区域;通过分析采空区遗煤空间分布规律及不同惰性气体的惰化特性,提出了综放工作面采空区复合惰化技术,即高位压注CO2和低位压注N2,并与单一气体惰化技术进行了对比研究。结果表明:复合惰化技术相较于单一气体惰化技术有着更好的防灭火效果;在工程应用中,各监测点CO体积分数在短时间内均降低到2.4×10^-5以下,压注惰气期间防灭火效果良好。Spontaneous combustion of residual coal in goaf is one of the main accidents affecting coal production safety.Based on Fluent numerical simulation technology,a three-dimensional physical model of goaf was built,the three-dimensional distribution law of the flow field in goaf was simulated and studied,and the dangerous areas of the spontaneous combustion of residual coal in goaf were divided by the O2 volume fraction as the discriminant index;by analyzing the spatial distribution of residual coal in goaf and inert gas characteristics of different inert gases,the compound inerting technology in fully mechanized working face in goaf was put forward,namely high pressure injection of CO2 and low pressure injection of N2,and it was compared with the single gas inerting technology.The results show that the compound inerting technology has better fire prevention and extinguishing effect than the single gas inerting technology;in engineering application,the CO volume fraction at each monitoring point is reduced to less than2.4×10^-5 in a short time,and the fire prevention and extinguishing effect is good during injection of inert gas.

关 键 词：综放工作面 采空区 遗煤自燃 危险区域判定 复合惰化技术 数值模拟 

分 类 号：TD752.2[矿业工程—矿井通风与安全]