大气扰动下封闭火区瓦斯波动特性分析  

Analysis of gas fluctuation characteristics in a closed fire zone under atmospheric disturbance

作　　者：段玉龙 王硕 杨燕铃 李元兵 王文和[1] 蒋新生 DUAN Yulong;WANG Shuo;YANG Yanling;LI Yuanbing;WANG Wenhe;JIANG Xinsheng(College of Safety Engineering,Chongqing University of Science&Technology,Chongqing 401331,China;Oil Department,Army Service College,Chongqing 401331,China)

机构地区：[1]重庆科技学院安全工程学院,重庆401331 [2]陆军勤务学院油料系,重庆401331

出　　处：《中国安全科学学报》2019年第12期59-65,共7页China Safety Science Journal

基　　金：国家自然科学基金面上项目资助(51874063);重庆市科委自然科学基金面上项目资助(cstc2019jCyjmsxmX0324);重庆市教育委员会科学技术研究计划资助项目(KJQN201801517);重庆科技学院校内科研基金资助(ck2017zkyb001)。

摘　　要：为预防火区封闭导致的瓦斯爆炸事故,以大型地下矿井为研究对象,根据矿井内瓦斯涌出量和矿井结构特点,建立气压波动、封闭火区漏风量、封闭火区瓦斯体积分数预测模型;研究火区内侧瓦斯体积分数因大气扰动在压差、火区体积、风阻、瓦斯涌出量和封闭时刻等多因素耦合影响的变化特征。结果表明:封闭火区内外压差因大气波动呈现周期变化,火区体积和瓦斯涌出量决定火区瓦斯体积分数;风阻是火区抗大气波动干扰关键因素,增加火区风阻,可缩短瓦斯体积分数通过爆炸极限时间;降低封闭火区体积,可缩短瓦斯爆炸时间。In order to prevent gas explosion induced by closed fire zones,with large underground mines as research object,a gas pressure fluctuation model,an air leakage model and a gas concentration prediction model were established according to gas emission amount and structural characteristics of mines.Then,variation law of gas concentration in inner areas due to atmospheric disturbance was studied under coupling influence of pressure difference,fire zone volume,wind resistance,gas emission amount and sealing timing.The results show that pressure difference between inside and outside of closed fire zones will change periodically due to atmospheric fluctuation,and gas concentration is determined by zone volume and gas emission amount.Among all factors,wind resistance is a vital one that affects fire zone’s ability to withstand disturbance of atmospheric fluctuation,and an increase of it will shorten time for gas concentration to pass explosion limit while an reduction of zone volume can shorten explosion period.

关 键 词：封闭火区 压差 瓦斯体积分数 大气波动 

分 类 号：X936[环境科学与工程—安全科学]