Experimental study on cooling law of spontaneous combustion by liquid CO2 injection in coal bunker
ZHAI Xiaowei
AN Qi
HOU Qinyuan
LIU Xiliang
DUAN Xuhui
Abstract：As a large coal storage yard,coal bunker is prone to spontaneous combustion due to air leakage and chimney effect.In or-der to study the disposal effect of liquid CO2 on spontaneous combustion of coal bunker,a liquid CO2 cooling test bench was built to simulate the structure of coal bunker.The temperature variation laws of the coal bunker during the injection of liquid CO2 and after the injection was stopped were tested,and the variation of the temperature field in the high-temperature area was analyzed.The res-ults show that during the injection of liquid CO2 into the coal bunker,the main cooling areas are concentrated at the liquid CO2 re-lease port and the seepage passage area;the average temperatures of the a,b,and d planes decreased by 22.7℃,33.0℃,and 10.2℃respectively.The cooling areas are the phase change cooling area,seepage cooling area,and convection cooling area respectively.After the injection was stopped,compared with the temperature before the injection,the temperatures in the upper and lower high-temperature areas decreased by 22.3℃and 16.8℃respectively.The temperature change of the coal body in the coal bunker mainly relied on the heat transfer through the temperature difference conduction of the coal body and the heat absorption by the sublimation of low-temperature dry ice.At the same time,it indicates that during the fire extinguishing process in the coal bunker.
Keywords：coal bunkerspontaneous combustion of coalliquid CO2fire prevention and extinguish technologyinert gascooling lawtemperature field
Publication Date：2025-11-20
Online Publishing Date：2025-11-25(First online date of this platform, not the publication date of the document)
Pages：5( 59-63 )