Abstract: With the gradual introduction of fast mining equipment,the problem of dust pollution on fast mining surface is more and more serious. In order to effectively reduce dust pollution in the production process of fast excavation surface,a dynamic air flow control dust removal purification system is designed. By adjusting the state of air flow and designing air flow control schemes under different working conditions,the dust concentration and dust diffusion distance at the driver are reduced. A finite element model of wind-dust coupling field was established based on the fast excavation surface of a mine in Shaanxi Province,and the model was verified underground. The effects of four parameters,namely,outlet deviation angle,outlet scaling aperture,outlet distance from end and air volume pressure pumping ratio,on air flow and dust field in dynamic air flow control and dust removal system were analyzed. Orthogonal test was designed to analyze the correlation between the parameters and the dust concentration and dust diffusion distance,and the optimal control and purification scheme was determined. The results show that the effects of each parameter on the dust concentration and dust diffusion distance at the driver are as follows: air volume pressure extraction ratio,outlet deviation angle,outlet distance from the end,outlet scaling aperture. The optimal control and purification scheme was determined as 10 m from the end of the outlet,20° from the deviation angle of the outlet,1. 0 m zoom of the outlet and 1 air volume pressure pumping ratio. The test platform was designed and built to test the accuracy and purification effect. The average error between the simulated value and the test value was less than 8. 91%. After purification,the dust concentration at the driver's place was reduced from 327. 22 mg / m3 to 156. 47 mg / m3,a decrease of 52. 18%,and the dust diffusion distance was shortened from 39. 74 m to 25. 91 m. Shorten by 34. 80%,which effectively improves the air environment of the fast digging surface.

Key words: mine ventilation,fast excavation face,air purification,dynamic regulation of air flow,numerical simulation,gas-solid two-phase flow