摘要
以上湾煤矿22104采空区为研究对象,在地表释放SF6示踪气体验证漏风通道的存在,计算漏风流速;使用Fluent流体模拟软件进行浅埋煤层开采采空区气体运移规律分析,以工作面实际生产参数及采空区漏风实测数据作为建模边界条件,构建采空区数值模拟分析物理模型;模拟有无地表漏风2种情况下采空区内部漏风流场及气体运移规律。模拟结果表明,在地表漏风的情况下,采空区内部低氧气体异常涌出,导致工作面上隅角低氧问题愈发严重。针对低氧问题,采用局部均压通风措施进行治理,实践表明采空区漏风量和压差减小,回风隅角氧气体积分数升高,低氧现象得到了改善。
Taking 22104 goaf of Shangwan Coal Mine as the research object,SF6tracer gas was released on the surface to verify the existence of air leakage channel and calculate the air leakage velocity.The Fluent fluid simulation software was used to analyze the gas migration law of goaf.The physical models of numerical simulation analysis of goaf were established with the actual production parameters of working face and measured data of air leakage in goaf as modeling boundary conditions.Simulation of leakage airflow field and gas migration rule in goaf with or without surface air leakage shows that under the condition of surface air leakage,hypoxic gas in goaf abnormally flows out,resulting in more serious hypoxic problem in corner of the working face.In view of the problem of hypoxia,local equalized pressure ventilation measures are put forward to treat it.The practice shows that the air leakage volume and pressure difference in goaf are reduced,the oxygen volume fraction in the return air corner is increased,and the hypoxia phenomenon is improved.
作者
张岱岳
艾子博
李鹏
ZHANG Daiyue;AI Zibo;LI Peng(CHN Energy,Beijing 100011,China;School of Emergency Management and Safety Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;China Energy Shendong Coal Group Co.,Ltd.,Yulin 719315,China)
出处
《矿业安全与环保》
北大核心
2022年第6期1-6,33,共7页
Mining Safety & Environmental Protection
基金
国家自然科学基金创新研究群体项目(52121003)
国家自然科学基金重点项目(52130409)。
关键词
地表漏风
SF6
低氧
FLUENT
气体运移
均压通风
surface air leakage
SF6
low oxygen
Fluent
gas migration
equal pressure ventilation
