轴向压及径向旋流风幕的形成与隔尘仿真

Simulation on formation and dust separation of axial pressure and radial whirl air curtain

为了提高掘进面的风幕隔尘效果并降低粉尘体积质量,设计轴向压风幕及径向旋流风幕形成与隔尘仿真实验,确定2种风幕的形成规律与隔尘规律.1)形成规律:压风量越大,越不利于2种风幕的形成,但对轴向压风幕的影响更大;压抽比越大,越利于形成轴向压风幕,对径向旋流风幕的影响相反.2)隔尘规律:压风量越大,2种风幕的隔尘效果越优;当压风量增至300m3/min后,轴向压风幕消失,该条件下,压风量越大,迎头粉尘向外运移能力越强;压抽比越小,2种风幕的隔尘效果越优,且径向旋流风幕的效果提高更大;当压抽比为0.75时,2种风幕的隔尘效果均已接近最优值.径向旋流风幕的形成受通风条件影响较小,隔尘效果也更优,更适用于掘进面现场隔尘.

The simulation experiment was designed to improve the dust separation effect of air curtain and reduce the dust concentration in heading face. The law of formation and dust separation effect of the two kind of air curtain is determined, （i） The law of formation： the increase of pressure air volume is not con-ducive to the formation of two kinds of air curtain, which has more effect on axial pressure air curtain; the increase of pressing and pumping air volume ratio is beneficial to the formation of axial pressure air cur-tain, but has opposite effect on the formation of radial whirling air curtain, （ii） The law of dust separa-tion： the more the pressure air volume is, the better the dust separation effect of the two kinds of air cur-tain is ; but axial pressure wind curtain disappears when the pressure air volume increases to 300 m3/niin, the outward migration ability of dust in heading face becomes stronger with the increase of pressure air vol-ume under this condition; the lower the pressing and pumping air volume ratio is , the better the dust sepa-ration effect of the two kinds of air curtain is, and the effect of radial whirl air curtain improves greater; the dust separation effect of the two kinds of air curtain is close to the optimal value when the pressing and pumping air volume ratio is 0.75. The formation of radial whirl air curtain is less affected by ventilation condition, and its dust separation effect is generally better, which is more suitable for dust separation in the field of heading face.