Effect of periodic wide atmospheric pressure change on CO emission in closed goaf
作者机构：School of Emergency Management and Safety EngineeringChina University of Mining and Technology(Beijing)Beijing 100083China Security DepartmentUniversity of International Business and EconomicsBeijing 100029China School of Civil and Resources EngineeringUniversity of Science and Technology BeijingBeijing 100083China
出 版 物：《International Journal of Coal Science & Technology》 (国际煤炭科学技术学报（英文）)
年 卷 期：2023年第10卷第4期
页 面：139-150页
核心收录：
学科分类：0820[工学-石油与天然气工程] 081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学]
基 金：This work was financially sponsored by the National Natural Science Foundation of China(51864045,51804161,52074156 and 51804355) And Central University Basic Scientifc Research Business Expenses Special Funds(2023ZKPYAQ03).
主 题：Atmospheric pressure Periodic variation Closed goaf CO emission Coal mine
摘 要：Atmospheric pressure fuctuation is one of the most important factors afecting the climate environment and gas emission in the fre area.To obtain the infuence rule of the surface atmospheric pressure change on the gas sampling and abnormal emission in the mine closed goaf,the No.1 coal mine in Dananhu was taken as the research object.Using Fourier transform and Fisher harmonic analysis and other statistical methods,the infuence of the periodic variation of atmospheric pressure on the gas leakage and outfow in the closed goaf was studied.The results showed that there were three atmospheric pressure periods of 15.2 d,1 d and 182.2 d,and the probability was greater than 95%.The time period with the highest number of atmospheric pressure peaks was 7:00–8:00,which accounted for 20.2%of total occurrence number in a day.And the time periods with the highest number of atmospheric pressure trough were 2:00,15:00 and 16:00,accounting for 27.4%.The peak-to-trough transition time was mainly concentrated around 6 h,and the diurnal variation curve of atmospheric pressure was mainly bimodal.The atmospheric pressure change rate was mostly concentrated in 10–50 Pa/h.It was determined that the distance that the gas sampling pipe was pre-laid into the inner side of the closed wall should be greater than 44.4 m,and the CO concentration and atmospheric pressure in the closed goaf were both periodic and negative with atmospheric pressure.The research results have important guiding signifcance for the monitoring,early warning and environmental protection of the goaf.
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