关键词: 掘进工作面, 压入式通风, 长压短抽, 数值模拟, 粉尘运移

Abstract: In order to solve the problem of serious dust pollution of tunneling face,COMSOL software was used to establish the geometric modeling of 1019 tunneling face in a mine,and based on the k-ε turbulence model and fluid flow particle tracking model were used to calculate the velocity profile,airflow streamline distribution,and dust particle transport trajectory under pressure and long pressure short extraction ventilation methods. The impact of the two ventilation methods on dust particle transport was analyzed,and the dust transport law of the excavation working face was determined under the two ventilation methods. The results show that under the pressure ventilation method,fresh air is compressed into the tunnel by the pressure air duct,forcing the dust on the excavation face to be discharged from the tunnel with the airflow,causing the airflow curve in the front area of the excavation machine to be very dense and forming multiple eddies,causing dust particles to gather at the eddies. At the same time,some dust particles settle at the bottom of the tunnel,and some dust particles move towards the rear along the right tunnel wall,resulting in poor dust control effect. Under the long pressure short exhaust ventilation method,the velocity in the area ahead of the two air ducts is relatively high,and the airflow streamline between the pressure air duct and the exhaust air duct is dense. The compressed air duct blows out the airflow and carries the dust particles,while utilizing the suction effect of the exhaust duct to suck the dust particles into and out of the tunnel. Compared with the compressed ventilation method,the long pressure short suction has a better dust reduction effect.

Key words: heading face,forced ventilation,long pressure short extraction,numerical simulation,dust transport