Research and Application of New Equipment of Foam Dust Removal at Mechanized Excavation Face

Aiming at the problem that the efficiency is low for conventional coal dust removal technology in coal mine, the advantages of foam dust removal are analyzed in coal mine. A new foam dust removal device is developed, the work principle has been introduced, and the structural parameters have been calculated and analyzed. It is obtained that the optimal volume of liquid supply is 30 L/h, the optimal pressure of gas supply is 0.6 MPa, the optimal volume of gas supply 100 to 110 m³/h, the expansion ratio is up to 100 to 200 times, the stable foam time is 30 h. The field application results show that the structure of new foam dust removal device is simple, safe and reliable, the dust removal efficiency for all dust is 92.5%, the dust removal efficiency for respirable dust is 87%, which can effectively reduce the dust concentration in mechanized excavation face.