Abstract: The dust extraction system is an important component of controlling dust pollution in the long-pressure shortsuction ventilation method of the rock roadway fully mechanized excavation face,and the determination of appropriate dust extraction parameters is the key to achieving effective dust removal. The soft of Solidworks was used to establish physically model the 632 fully mechanized excavation face of a rock roadway in a certain mine,and ICEM-CFD mesh division was carried out. The subsequent mesh model was confirmed through grid independence testing. The computational fluid dynamics software FLUENT was used to numerically simulate the influence of different dust extraction positions Dn (n = 0,1/4,1/2,3/4,1) and exhaust air rate (300~350 m3 / min) on the dust pollution diffusion. The accuracy of the numerical simulation results were verified through simulation experiments. The results show that when the dust extraction positions are D0,D1/ 4,D1/ 2,and D3/ 4,respectively, the overall airflow in the roadway is in a relatively chaotic state. The dust pollution transported by the airflow eventually diffuses to the entire roadway. When the dust extraction position is D1,with the combined action of exhaust and compressed air,an effective dust control wind curtain with wind direction pointing towards the roadway head,uniform flow,and covering the entire cross-section of the roadway is formed within a range of 4. 6~6 m from the roadway head. Dust pollution is controlled by the air curtain in the enclosed space between the excavation machine driver and the roadway head. When the exhaust air rate are 330 m3 / min or above,an effective dust control air curtain is formed at the driver′s location. However,in order to minimize energy consumption while effectively controlling dust pollution,the optimal exhaust air rate is selected with the minimum value of 330 m3 / min.

Key words: rock roadway,fully mechanized excavation face,dust pollution,dust extraction position,exhaust air rate