Study on dust distribution features of high cutting fully-mechanized coal mining face

In order to master the dust distribution features of the high cutting fully-mechanized coal mining face, the measuring point set in the coal mining face wer e applied to the measures of the dust quantity density and the dust dispersion and to analyze the distribution laws of the dust density and the characteristic particle siz e. The result showed that the coal mining operation and the powered support removing operation would cause the major dust sources in the coal mining face. The dust quantity density from the powered support removing would be higher and the percentage of the respirable dust would be higher. The dust dispersion with the particle siz e over 10 μm in the coal miming face was high and was taken the major percentage in the dust. The dust dispersion with the particle size less than 10 μm was ranging f rom 16.32% ~ 41.16%. From the coal shearer to the air inlet of the coal mining face, the particle size in the dust was reduced successively, the percentage of the respir able dust was increased successively, the major partical size distribution scope was more concentrated, the Sauter mean partical size was reduced successively and th e specific surface area was increased successively. The dust connected by the miners in the coal mining face was the dust with the partical size less than 10 μm mainl y. The dust with partical size less than 10 μm was taken 61.36%, the middle partical size was 7.68 μm and the distribution scope of the major dust partical size was 1.7 4 ~ 20.39 μm.