Study On Dust Migration Laws In Fully Mechanized Heading Face Based On Optimization Of Ram Diameter And Location

Dust damage is one of the five major coal mine disasters in China, which reflected in explosion and occupational disease, thus coal miner’s life safety and body health was surrounded by threats. The tunneling working face produced a large proportion of the dust under coal mine, due to its large amount of dust, ventilation conditions and other factors such as poor working conditions, dust control has been the emphases and difficulties of safety management in our country. Higher pressure ventilation was the most common way in tunneling faces, the ram of different diameter and suspension position influenced the migration regularity of roadway dust greatly.Measuring point of the dust in Xiqu coal mine 8103 tunneling faces of Xishan coal electricity group was decorated and the dust was collected by CCZ-20 dust sampler, the dust concentration of related sites was measured through weighing the samples. by using origin software to analyze test data, the migration regularity of dust distribution of roadway was concluded At the same time we used FLUENT software to simulated the dust migration law of different diameter(0.6 m, 0.7 m, 0.8 m) ram. The Comparison between measured data with simulated data verified the validity of the simulated data, which optimized the tunneling face ventilation parameters.The actual data showed that when away from the ram, position near bottom always with high dust concentration, when close to the ram dust concentration near the roof was higher. Wind had a great impact on the dust concentration near the tunneling face, among full dust the larger particle settled faster, and the settlement of large dust through affecting the settlement of respiratory dust to reduce its concentration, in the roadway dust concentration started to be uniform from 300 m away of the tunneling faces, transfer point of belt conveyor near the tunnel entrance had a higher respirable dust concentrationNumerical simulation results showed that when used same diameter ram dust concentration in the upper left corner was smaller than in the middle of the roadway left side. When ram was suspended on the left sides of the roadway, dust concentration was smaller under a 0.7 m diameter ram than using 0.6 m or 0.8 m diameter ram.By comparing numerical simulation and field measurement data, the results of numerical simulation and field measurement had certain differences, but the dust concentration reduction trend was the same, the results of numerical simulation can analyzed dust transport law of roadway qualitatively, but can’t analyzed dust concentration quantitatively in fixed position. The results provided a certain theoretical and experimental basis on parameter optimization of diameter and position of the ram in tunneling faces.