Study on optimization of ventilation and dust removal parameters in heading face based on air curtain shielding

Abstract

In order to solve the problem of large dust production in the heading face and the pollution of other roadways by ventilation and dust discharge, based on the existing long pressure and short extraction ventilation, the combined dedusting scheme of air curtain dust prevention combined with long pressure and short extraction ventilation is proposed. The results show that when the pressure air volume is 330 m3/min and the pressure extraction ratio is 0.75, the dust control effect is better when the distance between the extraction dust removal fan and the working face is 3-4 m; however, the tunnel boring machine control area is close to the dust source. In order to better reduce the total amount of dust flowing through the tunnel boring machine control area, an air curtain is set 0.5 m in front of the tunnel boring machine control area. When the outlet wind speed of air curtain generator is 15 m/s, the dust control effect is the best, and the dust reduction rate can reach more than 90%.

Keywords

• coal mine safety
• dust pollution
• air curtain dust isolation
• fully mechanized excavation face
• long pressure short ventilation
• numerical simulation