Research on characteristics of dust distribution in breathing zone under multiple dust sources in fully-mechanized mining face
Dust pollution in the breathing zone of the fully-mechanized mining face is a direct threat to the life and health of miners,to reduce the harm of dust to the operators,a three-dimensional solid model of the fully-mechanized mining face of Xinqiao Coal Mine was established.Using Fluent numerical simulation to study the diffusion trajectory of dust in roadways under multiple dust source condi-tions,and the distribution characteristics of dust in the breathing zone area was investigated.Combined with on-site measured data,the dust dispersion in the main dust source points and along the respiratory zone was analyzed.The experimental results showed that during downwind coal cutting,the downwind side 20 m of the mining area was the main dust settling area,and the area within 60 m was a high dust pollution area;the respiratory zone was dominated by dust particles smaller than 30 μm,and the proportion of respirable dust parti-cles below 10 µm in the height of respiratory zone of the return airway was more than 54％,which was much higher than that of the coal mining surface;the dust production at the transfer point was an important factor that leads to the increase of the proportion of dust below 10 μm in the respiratory zone of the return airway.It is of great significance for the safe production of coal mines and the health of the workers to formulate dust prevention and control measures in the breathing zone on the basis of this theory.
万方数据
维普
