深冷惰气浆液防灭火实验研究  

Experimental study on fire prevention and extinguishing of cryogenic inert gas slurry

作　　者：张辛亥[1,2] 窦凯 张国伟 程望收[1,2] 李勋广 朱辉 赵斌 陈飞 杨少雄 ZHANG Xinhai;DOU Kai;ZHANG Guowei;CHENG Wangshou;LI Xunguang;ZHU Hui;ZHAO Bin;CHEN Fei;YANG Shaoxiong(Key Laboratory of Western Mine and Hazard Prevention of the Ministryf of Education,Xi'an 710054,Chirui;School of Safety Science and Engineering,Xi'an University of Science and Technology,Xi an 710054,China;Kaida Coal Mine of Inner Mongolia Yitai Coal Co.,Ltd.,Ordos 017000,China)

机构地区：[1]西部矿井开采及灾害防治教育部重点实验室,陕西西安710054 [2]西安科技大学安全科学与工程学院,陕西西安710054 [3]内蒙古伊泰煤炭股份有限公司凯达煤矿,内蒙古鄂尔多斯017000

出　　处：《煤矿安全》2021年第10期51-56,共6页Safety in Coal Mines

基　　金：国家自然科学基金煤炭联合基金资助项目(U1361129)。

摘　　要：为有效防治煤矿自燃火灾隐患,针对现有惰气防灭火技术降温效果差、输送工艺复杂等不足,开展深冷惰气浆液防灭火技术研究,自主设计了深冷惰气浆液制备及升温松散煤体降温实验系统,得到不同压注流量下实验箱中不同测点温度变化情况和CO和O_(2)体积分数变化情况。结果表明:在LN2提供低温冷源的作用下,LCO_(2)(液态CO_(2))在管道传输过程中与LN_(2)(液氮)混合,以固液气三相形式注入实验箱,迅速发生相变,有序结构受得破坏,吸收大量热量,箱体中空气和煤体温度迅速下降,大流量注入时防灭火性能更佳。通过对比单独注入LN_(2)和LCO_(2)时防灭火效果,得出惰气浆液防灭火技术兼具LN_(2)和LCO_(2)防灭火优点,降温降氧效果显著,防灭火效果优于LN_(2)和LCO_(2)。In order to effectively prevent and control the coal mine spontaneous combustion fire hazard, the research on the technology of cryogenic inert gas slurry was carried out aiming at the shortcomings of the existing inert gas fire-fighting technology, such as poor cooling effect and complicated conveying process. The experimental system for the preparation of cryogenic inert gas slurry and the cooling of heated loose coal was independently designed, and the temperature changes at different measuring points and the concentrations of CO and O_(2) in the experimental chamber were obtained under different injection flow rates. Results show that LCO_(2)(liquid CO_(2))is mixed with LN_(2)(liquid nitrogen)in the pipeline transmission process,and injected into the experimental chamber in the form of solid, liquid and gas three-phase. The phase change occurs rapidly, the ordered structure is damaged, and a large amount of heat is absorbed. The temperature of air and coal in the box drops rapidly,and the fire prevention performance is better when large flow rate is injected. By comparing the fire-extinguishing effect of injecting liquid nitrogen and liquid carbon dioxide separately, it is concluded that the anti-fire-extinguishing technology of inert gas slurry has the advantages of both liquid nitrogen and liquid carbon dioxide, and the cooling and oxygen reduction effect is significant, and the anti-fire-extinguishing effect is better than that of liquid nitrogen and liquid carbon dioxide.

关 键 词：防灭火 深冷惰气浆液 高温松散煤体 降温性能 相变 

分 类 号：TD752.2[矿业工程—矿井通风与安全]