The natural ignition of shallow burial,very close coal seam groups is typical characteristics of most of the coal seams in Yushupo coal mine in China.It is difficult to manage the fire zone in the coal field and the safety is threatened.Through thermal analysis experiments,the influence of the use of liquid CO2 on the cooling law and spontaneous combustion characteristics of high temperature coal body is studied,and it is observed that the porosity of loose coal body has a signifi-cant effect on the cooling effect of CO2;it is emphasized that the increase of CO2 concentration can affect the apparent acti-vation energy of coal oxidation,which provides a theoretical basis for explaining the role of CO2 in inhibiting coal spontane-ous combustion.Fluent numerical simulation is adopted to calculate the diffusion radius of liquid CO2 injected into the min-ing area,and to obtain the effective inerting radius of liquid CO2 on the coal left in the mining area.
关键词
液态二氧化碳/防灭火机理/热分析试验/高温煤体/扩散半径
Key words
liquid CO2/fire prevention and extinguish mechanism/thermal analysis experiment/high temperature coal body/diffusion radius
维普
万方数据