易自燃工作面“U+L”形通风系统氧化带宽度影响因素分析  

Analysis of the influential factors of the oxidation width for“U+L”type ventilation system in the spontaneous combustion working face

作　　者：张春[1] 栾铮 闻天翔 ZHANG Chun;LUAN Zheng;WEN Tian-xiang(Safety Science and Engineering College,Liaoning Technical University,Fuxin 123000,Liaoning,China)

机构地区：[1]辽宁工程技术大学安全科学与工程学院,辽宁阜新123000

出　　处：《安全与环境学报》2020年第6期2154-2159,共6页Journal of Safety and Environment

基　　金：国家自然科学基金项目(51074086,51174109);辽宁省教育厅项目(LJ2017QL003);辽宁省自然科学基金项目(2019-ZD-0043)。

摘　　要：为了使工作面"U+L"形通风系统能够高效应用,采用理论分析与数值模拟相结合的方法,对工作面"U+L"形通风系统高效应用的衡量原则及不同供风量条件下联络巷距工作面距离与采空区氧化带宽度的关系进行了研究。结果表明:随联络巷距工作面距离增加,采空区氧化带宽度先减小后增大,这一现象与传统观点恰好相反,通过理论分析给出了二者的完整关系曲线及形成原因;工作面供风量与采空区氧化带宽度近似满足指数函数关系,且风量越大这种关系越明显;当联络巷距工作面距离大于30 m时,距离越大,工作面供风量的变化对采空区氧化带宽度的影响越明显;当联络巷距工作面20 m时,风量增加对氧化带宽度变化的影响最弱。假设采空区允许的最高氧化带宽度为50 m,工作面供风量为3000 m^(3)/min及4000 m^(3)/min时,在不采取措施的条件下采空区遗煤容易发生自燃;当工作面供风量为1000m^(3)/min及2000 m^(3)/min时,联络巷的间距不能大于43 m和30 m。In order to make the"U+L"type ventilation system of the working face efficient enough,the paper has made a theoretical analysis from the following 4 aspects,that is,the evaluation method of"U+L"ventilation system via the gas concentration rate in return air lane,coal spontaneous combustion in the goaf,the ventilation system management and economic rationality.In so doing,we have established a simulation model of"U+L"ventilation system by analyzing the relationship between the position of the connecting roadway and the width of oxidation zone in the goaf under the conditions of the air supply of 1000 m^(3)/min,2000 m^(3)/min,3000 m^(3)/min and 4000 m^(3)/min respectively through the numerical simulation.The results of our study show that,with the increase of the distance between the connecting roadway and the working face,the width of the oxidation zone in the goaf tends to decrease first and then increase.Such a phenomenon we have found tends to be contrary to the traditional idea,with the entire relation curve between them and the reasons for their formation given through the theoretical analysis.On the other hand,the relation between the supply air volume of the working face and the width of oxidation zone in the goaf turns to be in approximately exponential function,the fact here is:The greater the air volume,the more obvious the relationship is.And,when the distance between the connecting roadway and the working face gets to over 30 m,the situation would be:the greater the distance is,the more obvious the influence of the change of the air supply volume on the width of the oxidation zone would be.And,then,when the distance between the connecting roadway and the working face becomes less than30 m,the change of the curve of the width of the oxidation zone would be so small as to be get intersected.And,later,when the connecting roadway is 20 m away from the working face,the influence of the air volume increase on the width of oxidation zone would become weakest.Thus,it can be predicted that the maximum width of

关 键 词：安全工程 “U+L”形通风系统 氧化带宽度 联络巷 数值模拟 

分 类 号：X936[环境科学与工程—安全科学]