水分蒸发引起巷道局部壁温低于风温的理论分析  

Theoretical analysis of tunnel wall local temperature lower than airflow temperature caused by evaporation in mines

作　　者：何昌富[1] 刘何清[1,2] 殷维[1,2] 杨威[1] 

机构地区：[1]湖南科技大学能源与安全工程学院,湖南湘潭411201 [2]湖南科技大学煤矿安全开采技术湖南省重点实验室,湖南湘潭411201

出　　处：《矿业工程研究》2014年第1期35-38,共4页Mineral Engineering Research

基　　金：国家自然科学基金资助项目(51074072;51134005);湖南省科技计划资助项目(2012FJ2001)

摘　　要：现场实测发现高温矿井井下巷道壁面温度低于风流干球温度现象.通过对巷道围岩与风流间热湿交换分析,建立了巷道围岩内部温度场数学模型;将潜热交换量表示成巷道壁面温度、风流温度及对流换热系数的函数,得出了求解巷道壁面温度的计算式;对此巷道壁面温度计算式进行数学变换、整理,得出二次曲线.经理论和图解法分析得出了湿润巷道壁面温度低于风流干球温度的临界条件,从理论上解释了"高温矿井湿润巷道壁面局部温度低于风流干球温度"这一现象.Measured resuhs show that tunnel wall temperatures are lower than airflow temperature in some places of high temperature mines. This paper firstly set up the temperature distribution mathematical model inside the surrounding rocks by analysis of heat and moisture transfer between tunnel rock surface and airflow, and secondly deduces a formula that calculates tunnel wall temperature with function of water evaporation heat transfer considering airflow velocity, temperature and humidity, and thirdly quadratic curve is obtained by making mathematical transformation to this formula. Theoretical and graphical method reveal the critical condition of wet wall temperature which is lower than air temperature, the phenomenon that the tunnel wall local temperature covered with water is lower than airflow temperature is explained theoretically.

关 键 词：高温矿井 巷道壁面温度 对流换热 蒸发换热 

分 类 号：TD727[矿业工程—矿井通风与安全]