Experimental Study On Mine Ventilation Pressure Change Wind Resistance And Fan Performance

Mine ventilation is the most important technical means to ensure safe mining of mines.However,with the expansion of mining scale,the mining trend is developing in two directions of high altitude and deep underground wells,which leads to changes in the mining environment,that is,in high-altitude mines.The atmospheric pressure drops,and the atmospheric pressure increases in deep well mining,which leads to the corresponding increase and decrease of the friction coefficient of the roadway,and also the change of the frictional wind resistance,which makes the ventilation system and the shallow well mining different.Therefore,studying the influence of atmospheric pressure on the change of frictional resistance coefficient is of great significance for improving high altitude mining and deep well mining.In this paper,the combination of theoretical analysis and experimental research is used to study the variation of atmospheric pressure on frictional resistance coefficient.In order to make the working environment of the wind turbine in the high altitude and underground deep well area,in order to make the working environment of the wind turbine the same as that in the high altitude area,a sealed pressure-adjustable fan embedded experimental device was designed and developed.The connection of the control system can quantitatively adjust the pressure inside the pipe.The pressure regulation range is 0.07MPa~0.13 MPa,which is consistent with the operating pressure environment of the fan from 3000 m deep to 4000 m above sea level.At high altitudes,due to the decrease of atmospheric pressure,the air density is reduced,resulting in a decrease in the frictional resistance coefficient of the pipeline.On the contrary,the coefficient of frictional resistance of the pipeline increases in the deep well area,and the atmospheric pressure is found when fitting the data.The frictional resistance coefficient is positively correlated with a quadratic function.Experiments show that the friction coefficient of the same support method with the same section of the low-altitude shallow well cannot be directly copied during the design of the high-altitude mine.Through real-time monitoring of the input power and output power of the fan,it is found that the higher the atmospheric pressure,the greater the efficiency of the fan at the same speed,indicating that the efficiency of the fan will decrease in high altitude areas,and the efficiency of the fan will increase in the deep well area.The paper has 34 pictures,13 tables,and 73 references.