高温高湿矿井湿热空气对通风风阻的影响

The Influence of Humid and Hot Air on Ventilation Resistancein High Temperature and High Humidity Mine

高温矿井中矿井通风阻力包括摩擦阻力和热阻力。在考虑湿、热源影响的情况下,井下风流密度应视为变量,通过对巷道平均密度的推导得出了以压力损失表示的巷道摩擦阻力的修正公式;引入热阻力的概念,以一维可压缩稳定流为基础,建立流体的连续性方程、动量方程、能量方程,推导得出流体在粘性阻力和重力同时存在的情况下热阻力的表达式,给出了热阻力系数的计算公式。通过对某矿山运输巷道的实测参数的分析,进一步证实了井下热源对巷道通风阻力的影响已不容忽视。

Ventilation resistance in high temperature mine includes friction resistance and thermal resistance. Considering the influences of humidification and heat sources, the density of underground mine air should be deemed to be a variable. Based on the average corrected density of roadway air, an improved calculation formula of friction resistance was given ,which is expressed with pressure loss. By introducing the concept of thermal resistance, based on one -dimensional compressible steady flow, the continuity equation, momentum equations, energy equation of flow were established, and the formulas for calculating the thermal resistance and thermal resistance coefficient of flow at the situation of viscous resistance and gravity all existing simultaneously were derived. The measured parameters of airflow in a real mine haulage roadway were analyzed, the results further proved that the influence of heat source on the ventilation resistance of roadway couldn＇t be ignored.