Research on control of high temperature oxidation in shallow buried old goaf by injecting liquid carbon dioxide
WU Jianguo
GUAN Lianhe
ZHANG Wujun
LI Chunyong
GUO Xikai
WANG Yuhuai
ZHANG Sijia
LI Jingyang
DOU Jingwen
GAO song
Abstract：To mitigate the fire hazard associated with the room-and-pillar old goaf in shallow-buried deep coal seams,a combination of underground mobile liquid CO2 pressure injection and long-distance liquid CO2direct injection is employed to achieve effective long-distance liquid CO2 mobile injection.Following the injection of 16 tons of liquid CO2 into the goaf,the concentrations of O2 and CO were reduced to normal levels prior to oxi-dation,while C2H4 was eliminated.Simultaneously,the concentration of CO2 increased,and the concentration of N2 decreased.During the injection process,the temperature in the old goaf area experienced a significant decrease in a short period,followed by a subsequent rise in temperature.The injection of liquid CO2 effectively controlled coal oxidation in the old goaf area.
Keywords：shallow deepold goafliquid CO2long distance perfusion
Publication Date：2025-10-30
Online Publishing Date：2025-11-06(First online date of this platform, not the publication date of the document)
Pages：8( 52-59 )