陕西煤炭2026，Vol.45Issue(9)：1-6,6.DOI:10.20120/j.cnki.issn.1671-749x.2026.0901
采空区液态CO2降温规律模拟研究
Simulation study on cooling law of liquid CO2 in goaf
摘要
Abstract
Liquid CO2 is more and more used in mine fires in order to further improve the fire prevention and extinguishing efficiency of liquid CO2.In this paper,a three-dimensional numerical model of goaf is established based on the research background of a working face in Yangchangwan Coal Mine.By changing the injection flow rate,injection time and air speed of liquid CO2,the influence of CO2 injection parameters on the cooling range is studied.The results show that the range below 0℃increases with the increase of injection flow rate.When the injection flow rate increases from 2.5 kg/s to 7 kg/s,the range below 0℃increases by 45.7 times,and the range of CO2 concentration higher than 50%increases by 40 times.With the increase of air speed,the air speed increases from 0.3 m/s to 1 m/s,the range below 0℃decreases by 79.1%,and the range above 50%of CO2 concentration decreases by 78.9%.Prolonging the injection time can increase the range below 0℃.Combined with the air distribution and cooling inerting performance requirements of Yangchangwan working face,it is determined that when the air speed of the working face is 0.5～0.8 m/s,the optimal pressure injection flow of liquid CO2 is 5～7 kg/s,and the injection duration is 4～5 h.The research results provide a theoretical basis for the development of liquid CO2 fire prevention measures in the working face of Yangchangwan Coal Mine.关键词
煤自燃/采空区/液态CO2/降温规律/防灭火Key words
coal spontaneous combustion/goaf/liquid CO2/cooling law/fire prevention and extinguishing分类
矿业与冶金引用本文复制引用
景巨栋,段旭辉,李宁,魏伟,翟小伟,王凯..采空区液态CO2降温规律模拟研究[J].陕西煤炭,2026,45(9):1-6,6.基金项目
国家自然科学基金项目(52274229) （52274229）
陕西省创新能力支撑计划-科技创新团队项目(2025RS-CXTD-035) （2025RS-CXTD-035）
陕西省自然科学基础研究计划-实验室重点项目(2025SYS-SYSZD-052) （2025SYS-SYSZD-052）
