机掘工作面旋转射流屏蔽通风吹吸流量比研究

Study on Flow Ratio of Blowing to Drawing of Rotational Jet Shield Ventilation at Tunneling Working Face

为改善机掘工作面作业环境,提高通风控尘效果,采用旋转射流屏蔽通风技术实现对机掘工作面粉尘的有效控制。利用Fluent计算流体力学(CFD)软件,对该通风方式下不同吹吸流量比情况开展数值模拟,并进行相关试验验证。研究结果表明:就所研究的机掘工作面旋转射流屏蔽通风系统而言,合适的吹吸流量比范围是0.8～1.4,当吹吸流量比为1.0时控尘效果最佳。在工作面实际应用中,通常将吹吸流量比设定在1.2～1.4范围,既能保证掘进巷道有足够的新风量,防止瓦斯超限,又能获得较好的控尘效果。

For the sake of improving the working environment at tunneling working face and enhancing the ventilation effect,the rotational jet shield ventilation was introduced.Using CFD software Fluent,the rotational jet shield ventilation under different flow ratios of blowing to drawing was investigated by numerical simulation,and related experiment was carried out to verify the simulation.The results show that the relatively suitable range of the flow ratio is from 0.8 to 1.4 for the system of rotational jet shield vetilation of this study,and the best dust control effect can be obtained with the flow ratio of 1.0.In the actual application,the flow ratio is usually in the range of 1.2 to 1.4,which not only ensures sufficient fresh air to prevent gas overrunning but also can obtain a good dust control effect.