摘要
为研究采空区在回风侧埋管压注液态CO_(2)的位置与流量参数,基于采空区多孔介质模型与气体组分输运模型,建立了小庄矿40207综放工作面回风侧埋管压注液态CO_(2)模型,模拟研究采空区回风侧压注液态CO_(2)的埋管深度为50 m时,在不同压注位置及不同压注流量下,压注液态CO_(2)24 h后引起的采空区O_(2)体积分数变化情况。模拟结果表明:在压注位置距工作面20~80 m范围内,采空区O_(2)体积分数随着压注位置距工作面的距离增加呈现不断减小的趋势,随压注流量增大逐渐降低;在压注位置距工作面60~80 m、压注流量为500~800 m^(3)/h时,CO_(2)对采空区惰化的效果较好,且不会引起工作面上隅角CO_(2)浓度超限。在回风侧埋管注液态CO_(2)可有效降低采空区O_(2)体积分数,从而防止采空区遗煤自燃。
In order to study the location and flow parameters of liquid CO_(2) injected by buried pipe at the return air side of goaf,based on the porous media model and gas component transport model,the model of injecting liquid CO_(2) into the buried pipe at the return air side of 40207 fully mechanized caving face in Xiaozhuang Mine was established.When the depth of the buried pipe at the return air side of the goaf was 50 m,the changes of O_(2) volume fraction in the goaf caused by liquid CO_(2) injection for 24 h were simulated under different injection locations and different injection flow rates.The simulated results are concluded as follows.In the range of 20-80 m from the injection location to the working surface,the O_(2) volume fraction in goaf shows a decreasing trend with the increase of the distance between the injection location and the working face,and decreases gradually with the increase of the injection flow rate.When the injection location is 60-80 m away from the working face and the injection flow rate is 500-800 m^(3)/h,the effect of CO_(2) inerting the goaf is good and the concentration of CO_(2) in the upper corner of the working face will not exceed the limit.Injecting liquid CO_(2) into the buried pipe at the return air side can effectively reduce the O_(2) volume fraction in the goaf,thus preventing the spontaneous combustion of residual coal in the goaf.
作者
王建国
许娟娟
张超鹏
WANG Jianguo;XU Juanjuan;ZHANG Chaopeng(College of Safety Science and Engineering,Xi'an University of Science and Technology,Xi'an,Shaanxi 710054,China)
出处
《矿业研究与开发》
CAS
北大核心
2023年第11期68-71,共4页
Mining Research and Development
基金
国家自然科学基金项目(52174198)
陕西省自然科学基金项目(2017JM5066)。
关键词
采空区
煤自燃
回风侧
液态CO_(2)
参数优化
Goaf
Coal spontaneous combustion
Return air side
Liquid CO_(2)
Parameter optimization
