Research on the influence of wind speeds and multi-dust source factors on dust migration in respiratory zone of working face
In order to study the dust migration of the respiratory zone of the 6 m large mining height comprehensive mining face under different wind speeds and multi-dust source factors,the effects of different inlet wind speeds(1.0 m/s,1.5 m/s,2.0 m/s and 2.5 m/s)on the height of the respiratory zone and the dust concentration distribution at the sidewalk were explored based on the Fluent numerical simulation method.The dust concentration distribution on the lower side of the respiratory zone,at the height of the respiratory zone,on the upper side of the respiratory zone and the side near the sidewalk under the condition of multi-dust source factors was analyzed.The results showed that the dust concentration increased when the inlet wind speed decreased.When the mining height of the fully-mechanized mining face was 6 m,the wind speed of ventilation and dust removal should be greater than or equal to 2.0 m/s.Under the influence of multiple dust source factors,the dust concentration on the upper side of the respiratory zone changed greatly when the shearer was cutting coal,which showed that the closer to the coal seam wall,the greater the dust concentration.
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