摘要
为研究液氮在煤体内的传导机制,构建了基于玻璃棉的多孔介质体系,进行了液氮在多孔介质体系中的传热模拟实验。采用热电偶和数据采集器获取了多孔介质内温度场的动态分布,探讨了注液氮量对液氮传热特性的影响。结果表明,液氮在多孔介质体系中形成冷量集中区,呈现局部降温效果;冷量集中区以垂直向下移动为主,移动速度受注液氮量的影响较小。研究为液氮防灭煤火技术实践提供理论基础。
To study the conduction mechanism of liquid nitrogen in coal,a porous media system based on glass wool was constructed. Then the heat transfer simulation experiment of liquid nitrogen in porous media system was carried out. The dynamic distribution of the temperature field in porous media was obtained by a thermocouple and a data collector to discuss the effect of liquid nitrogen injection quantity on the heat transfer characteristics of liquid nitrogen. The results showed that liquid nitrogen formed a cold concentration zone,which reduced the temperature locally. The cooling concen- tration zone mainly moved vertically downward. Meanwhile,the impact of injection quantity on the vertical moving speed was relatively small. This study provides a theoretical basis for the practice of liquid nitrogen coal fire extinguishing tech- nology.
作者
康宁
苏贺涛
盛真可
KANG Ning;SU Hetao;SHENG Zhenke(School of Engineering and Technology,China University of Geosciences(Beijing),Beijing 100083,China;Shanghai Aerospace System Engineering Research Institute,Shanghai 201109,China)
出处
《真空与低温》
2020年第3期241-246,共6页
Vacuum and Cryogenics
基金
中央高校基本科研业务费专项资金(2652018098)。
关键词
液氮
冷量集中区
垂向传热
重力沉降
liquid nitrogen
cooling concentration zone
vertical heat transfer
gravity settling
