Optimization of CO2 inerting technical parameters for 7436 working face in Kongzhuang coal mine
CAI Chuncheng
ZHANG Xilong
LUO Songtao
CHENG Genyin
Abstract：In order to optimize the technical parameters of carbon dioxide inerting in the 7436 working face of Kongzhuang coal mine,the coal mine carbon dioxide injection process is introduced,a carbon dioxide inerting goaf index system is established,and the inerting parameters of the 7436 working face are confirmed.The physical model of goaf is established by Fluent numerical simulation method.The inerting effect of goaf and the volume fraction of carbon dioxide in the upper corner are studied under different gas injection depths and volumes.By comparing their inerting effects,the optimal inerting technical parameters are obtained.The re-search results indicate that when the gas injection rate increases to a certain extent,the effect of inerting the goaf will weaken,while the depth of the gas injection port has no significant effect on the width of the oxidation zone.Therefore,it can be concluded that the gas injection rate is the main factor affecting the inerting effect.By comparing the width of the oxidation zone in the goaf under different working conditions and considering safety factors,the optimal inert gas injection parameter for 7436 working face is determined when the gas injec-tion depth is 30 meters and the gas injection volume is 750 m3/h.
Keywords：goaffire prevention and extinguishingnumerical simulationcarbon dioxide
Publication Date：2024-08-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 43-48 )