Research And Application Of On-site Air Volume Test Method For Mine Local Ventilator

Mine local ventilator is responsible for conveying fresh air to the heading face and discharging harmful gases such as dust and gas in the heading roadway.Its performance directly determines the safety of coal mine production personnel in heading face.Therefore,it is very important to test the performance of mine local ventilator,especially the real-time measurement of field ventilation volume.This paper analyses the measuring principle and advantages and disadvantages of the traditional air measurement method.By comparison,it can be seen that only the equal ring area method can be used for the air measurement of mine local fans.Aiming at measuring the ventilation volume of local ventilator by equal ring area method,physical modeling and simulation analysis are carried out for the wind speed distribution of circular ventilation duct with and without brackets.The results show that the installation of test brackets has some influence on the wind velocity distribution of the wind measurement section.After studying the distribution of wind speed in the circular wind section,an experimental platform for studying the distribution of average wind speed points is built.The wind speed values at different measuring points are measured through the experimental platform.From the experimental data,it can be concluded that the wind speed at the measuring point 13 130 mm away from the axis of the air duct is equal to the average wind speed,and the maximum error is not more than 2.25%.Therefore,it can be inferred that there must be an average wind speed point for a certain diameter of the wind turbine,and its position does not change with the wind volume.This law can be used as an important basis for on-site measurement of ventilation volume of local ventilators.According to the distribution law of average air velocity points,the real-time air volume of local ventilators can be quickly and simply measured.According to the obtained law,a scheme of on-site measurement of local ventilator air volume is designed,and a complete real-time monitoring system of local ventilator air volume is established.Figure [45] table [7] reference [59]...