Experimental Study And Numerical Simulation Of Dustfall System In Fully Mechanized Coal Mining Face

The dust in the coal mine is very harmful to the human body.The number of deaths due to pneumoconiosis is far greater than the number of accidents in the whole country every year,and the fully mechanized coal face is the most place where the dust is produced.Therefore,the study of the dustfall system of fully mechanized coal mining face plays an important role in the underground personal safety.Based on the study of the dust reduction mechanism to working face dust dust production mechanism and spray on the numerical simulation and laboratory analysis,optimize the system of fully mechanized working face dust system,team spray and dust removal efficiency factors were analyzed and summarized the influence of dust.This paper analyzed and summarized through the numerical simulation of wind speed and dust transport of mine,wind and dust transport of coal mining and coal mining at the downwind upwind different mining methods are studied by numerical simulation,the coal roadway along style due to wind vortex,behind the coal mining machine produces a lot of dust,and near the coal one side wall of smaller wind in the coal mining machine behind the high concentration of dust,the wind coal mining,the eddy current velocity is small at the shearer in the coal mining machine,high concentration of dust.The dust atomization nozzle was tested and simulated,and the influence of different spray parameters on the spray effect was obtained.The two parameters of water supply pressure and nozzle diameter are analyzed.The best water supply pressure is 8MPa and the diameter of the best nozzle is 1.5mm.The spray system at the present stage of the underground is analyzed and optimized.It is concluded that a better dust reduction system can effectively reduce the dust concentration in the fully mechanized face.