煤矿安全2025，Vol.56Issue(11)：59-63,5.DOI:10.13347/j.cnki.mkaq.20241051
煤仓自燃液态CO2降温规律实验研究
Experimental study on cooling law of spontaneous combustion by liquid CO2 injection in coal bunker
摘要
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.关键词
煤仓/煤自燃/液态CO2/防灭火技术/惰性气体/降温规律/温度场Key words
coal bunker/spontaneous combustion of coal/liquid CO2/fire prevention and extinguish technology/inert gas/cooling law/temperature field分类
矿山工程引用本文复制引用
翟小伟,安琪,侯钦元,刘喜亮,段旭辉..煤仓自燃液态CO2降温规律实验研究[J].煤矿安全,2025,56(11):59-63,5.基金项目
国家自然科学基金资助项目(52274229) （52274229）
陕西省教育厅青年创新团队建设科研计划资助项目(21JP078) （21JP078）
