高温矿井湿润巷道表面与风流间热湿交换分析与简化计算

Analysis and a simplified calculation method of the thermo-moisture exchange between the hot mining roadway wall and the airflow

高温矿井巷道与风流间同时存在显热交换与潜热交换。相对于显热交换量,潜热交换量计算参数难以获得,致使巷道表面热湿交换量计算过程繁琐。为简化计算,对巷道热湿交换体系内显热、潜热交换与表面温度、空气状态温湿度的关系进行分析,通过饱和水蒸气分压力与温度的关系引入Lewis关系,将对流质交换系数用对流换热系数的函数关系表示,饱和水蒸气分压力用温度的函数关系表示,进而将潜热交换量表示成对流换热系数、壁面温度及风流状态露点温度的函数,将对流显热交换量与潜热交换量的计算有机结合;并针对高温矿井的客观条件,对潜热交换量计算式进行了适度的简化与误差修正,得出了精度满足工程计算要求的潜热及全热量简化计算式。同时分析了不同情况下全热简化计算式计算出的净热交换量的传递趋向,明确了不同矿井巷道表面温度及风流温度下,巷道表面水分蒸发需热量的取向。

The paper would like to present an analysis and a simplified calculation method of the ther mo-moisture exchange between the hot mining roadway wall and the airflow.As is known,when calculating the latent heat exchange related to that of the sensible heat exchange,it is not easy to acquire the calculation parameters.The field parameters,such as the air dry temperatures,air humid temperature,convective mass exchange coefficient,in addition to the moisture content of the airflow and water vapor pressure,are all needed to be indirectly concluded so as to make statistical analysis of the large quantities of measured data,because all these parameters may cause the roadway face hot and mass exchange process greatly different and complicated.However,since the working conditions and the mining environment safety contribute a great deal to the successful mining production,it is necessary to simplify the calculation of the heat and moisture exchange and regulate the error correction process into some sensible formulas through the analysis of the relationship between the sensible heat and roadway moisture.It is just for such essential needs that we feel urgent to introduce the relationship between the saturation water vapor and temperature by regulating the Lewis relationship and controlling the convection mass exchange coefficient with the convective heat exchange coefficient.Besides,it is also necessary to combine the convective latent heat exchange and the convective sensible heat exchange into a integrated system,which may represent the saturation water vapor pressure with its temperature function relevance.Therefore,according to the objective conditions of high temperature mining conditions,we have moderately simplified the calculation of the heat and moisture exchange and into some formulas through the analysis of the relationship between the sensible heat and roadway moisture.All of such simplification done as is necessary,the total heat exchange has been worked out by using the total heat exchange formulas under different conditions,and then the heat resources of the water evaporate on the roadway surface were cleared under different roadway surface temperatures and airflow temperatures.