采煤机截割粉尘扩散运移规律的试验研究

采煤机割煤滚筒旋转形成涡旋风流是导致割煤截割粉尘扩散运移的直接原因.通过对成庄煤矿某综放工作面采煤机割煤滚筒受限空间截割粉尘现场实测,分析研究截割粉尘在不同条件下扩散运移的基本规律,得出无论是顺风割煤还是逆风割煤,涡旋风流场对截割粉尘的作用主要发生在割煤滚筒靠近采煤机机身侧的下1/4圆周区域,并使该区域顺风割煤时截割呼吸性粉尘质量浓度达到95 mg/m~3,逆风割煤时呼吸性粉尘质量浓度达到110mg/m~3,远远高于国家有关标准和要求.

Experimental Research on Diffusion and Mitigation Law of Dust Cut Generated by Coal Shearer

It is known that the vortex wind flow, which is formed from the rotation of rotary drum of coal shearer, is the direct factor to cause the diffusion and mitigation of dust. The experimental measurement of the dust diffusion from coal cut was implemented at Chengzhuang Coal Mine's No.5306 full mechanized face in confined space and the basic law of diffusion and mitigation of cut dust under different conditions was analyzed. It is concluded that, for either downwind or upwind coal cutting, the role of vortex wind flow field in cut dust mainly occurs in the lower one fourth circular zone of the rotary drum beside the coal shear. The concentration of respiratory dust in the zone could be 95 mg/m³ under downwind coal cutting and 110 mg/m³ under upwind coal cutting. Both of them are far higher than the requirements of national standard.