In response to the technical difficulties such as large dust concentration and low visibility during the back mining of 206 working face in Dianping Coal Mine,Dianping Coal Mine decided to optimise and improve the ventilation and dust removal system of the original working face through technical research.According to the source of dust in the working face,fully enclosed dust prevention devices were installed at the unloading point of the header of the working face,and automatic spraying and rotating dust prevention devices were installed in the transport and return wind chute every 200 m.Foam dust suppression devices were installed in the machine road and the cutting part of the coal mining machine,which were improved through practical application.Foam dust-suppression device is installed in the machine road and the cutting part of the coal mining machine,through the actual application effect,the dust concentration at the unloading point is reduced to 32 mg/m3,the concentration of dust in the transport chute is reduced to 37 mg/m3,and the concentration of dust in the working face is reduced to 42 mg/m3 after the adoption of the comprehensive dust-suppression technology,which plays the expected effect of reducing the dust,and achieves the remarkable application effect.
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