Abstract: Aiming at the current status of the production process of the coal conveying underpass,a combination of ventilation and closeddust extraction and purification technologies,combined with closed dry fog dust reduction and other technical measures,was implemented to achieve comprehensive management of dust in the coal conveying underpass,and online monitoring of dust concentration.The system is intelligently controlled to achieve remote continuous monitoring and monitoring of the ventilation and dust removal system of the coal conveying dark tunnel.The total dust concentration at the location of the 5 m operator on the downwind side of the coal conveying dark tunnel transfer point has been reduced from 380.8 mg/m3 to 198 mg/m3.Reached 94.8%,the concentration of respirable dust decreased from 96.7 mg/m3 to 8.4 mg/m3,the dust reduction efficiency reached 91.3%,and the dust reduction effect was good.It effectively solved the problem of dust pollution in the dark tunnel of coal transportation and the reloading and dropping point.The dust prevention and control in the coal conveying underpass provides a reference basis.

Key words: Coal transport underpass,Dust,Ventilation and dust removal,Dry fog,Dust reduction efficiency