高低温环境下松散煤导热系数研究  

Thermal diffusivity research of loose coal under high/low temperature environment

作　　者：岳高伟[1] 雷留鹏 王兆丰[2] 谢策[2] 康博[2] 

机构地区：[1]河南理工大学土木工程学院,河南焦作454000 [2]河南理工大学安全科学与工程学院,河南焦作454000

出　　处：《河南理工大学学报（自然科学版）》2017年第2期1-6,共6页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(51274090);河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地开放课题(WS2012B01);河南省科技攻关计划项目(142102310268)

摘　　要：为研究冷冻取心过程中煤的温度变化规律,通过在高低温环境下煤体热传导过程中温度变化规律的测试,采用多维非稳态导热的乘积解法,对高低温环境下不同粒径松散煤体导热系数进行理论计算。结果表明,环境温度和松散煤粒度均对煤的温度变化率产生重要影响,不同温度和粒度下煤的导热性能差别较大;煤的比热容和松散煤的导热系数随温度升高而增大,其变化规律可用Polynomial函数表示,而且在同一温度下,松散煤的粒径越大,导热系数也越大。Based on frozen core technology in coal seam,thermal diffusivity of loose coal in low temperature environment is an important parameter for studying the temperature variation law of coal during core drilling.The temperature variations of loose coal heat conduction are tested under high/low temperature environment,and unsteady-state heat conduction multiplication method is adopted to theoretically calculate and analyze thermal conductivity of loose coal with different particle size under high/low temperature environment.The results show that the environmental temperature and coal particle size both have important influence for temperature variation of coal,and thermal conduction properties have larger difference under different temperature and particle size.The specific heat capacity of coal increases with the temperature rising,and thermal conductivity of loose coal also increases with temperature rising,which change law can be expressed by Polynomial function.At the same temperature,thermal conductivity of loose coal is greater with the larger particle size.These results would provide theoretical basis for studying the coal temperature variation during the frozen core drilling.

关 键 词：松散煤体 导热系数 非稳态导热乘积解法 高低温环境 

分 类 号：TD752[矿业工程—矿井通风与安全]