长压短抽式通风掘进面粉尘浓度分布规律数值模拟研究

Numerical Simulation Research on Distribution Rules of Dust Concentration in Excavation Working Face with Far-pressing-nearing-absorption Ventilation

为了有效降低掘进工作面粉尘浓度,根据掘进工作面压入式通风流场的分布特点,基于气固两相流和射流理论,利用Fluent自带的Gambit前处理软件建立了与现场实际相符的长压短抽式通风掘进工作面数值仿真模型,采用离散相模型(DPM),对压风口位置、压抽风量一定而吸风口位置不同处的工作面粉尘浓度分布规律进行了数值模拟研究。结果表明:在压风口位置、压抽风量一定的情况下,吸风口位于掘进工作面1m处,即在形成涡流区前的粉尘能够在抽放负压的作用下最大限度地被吸风风流排出,减少了涡流区受压风口风流卷吸作用而被重新压入工作面的粉尘量,保证了掘进工作面的风流质量。

To reduce the dust concentration of excavation face effectively, according to the distribution characteristics of the air current from forced ventilation on excavation face, based on the theory of two-phase flow of gas solid and jet, the Gambit of Fluent software was applied to establish true numerical simulation model of the excavation face with far-pressing-nearing-absorption ventilation, the dust con- centration distribution rules on excavation face with the same pressure air position and pressure pumping air blowing rate but different exhaust air position were simulated by using the Discrete Phase Models. The simulation results show that, under the conditions of certain pressure air position and pressure pumping air blowing rate, exhaust air position at the excavation face 1 m before the eddy zone was formed, the dust can be sucked ultimately under the action of negative pressure drainage in excavation face, the excavation face dust concentration was reduced due to the sucked air in the eddy zone, the air quality of the excavation face was ensured, too.