Influence of rotary wind from drums on lateral dissipation law of coal dust from cutting at fully-mechanized mining face

To explore the law that rotary wind from drums influences on lateral dissipation of coal dust from cutting,this paper simulated the flowing and dissipation law of wind-coal dust before and after rotary wind from drums into the face,and took the breathing zone as a height range to analyze the coal dust concentration distribution. According to the results of the study and research,a shear scrubber was developed,meanwhile,the application effect was investigated and the results of numerical simulation were verified by the measurement of coal dust concentration. Research indicates that the rotary wind from drums has a strong stability and it has very obvious entrainment to coal dust from cutting,the coal dust from TG drum enter into sidewalk by floor at the leeward 14. 2 m of center of shear,the coal dust from MG drum enter into sidewalk by floor at the center of shear,soon afterwards,swarming with wide range at the leeward 2． 9 m. At the breathing zone of sidewalk,the peak concentration distribution area is located in the leeward 18. 3-21. 8 m of center of shear,the coal dust concentration is about 300-400 mg / m3 . The relative error of initial measured coal dust concentration compared with the results of numerical simulation is less than 15% . The dust-laying rate of shear scrubber is maintained at 50-80% and its average dust-laying rate is 66. 9% .