可变角度新鲜风流下煤巷掘进长压短抽除尘效果数值模拟

Numerical simulation of dust removal effect of long pressure and short drainage in coal roadway tunneling with variable angle fresh air flow

传统的长压短抽除尘系统会在迎头处形成涡流,增加了粉尘的进一步积聚和循环。针对这一难题,提出了一种可改变压风筒出口风流角度的长压短抽除尘系统;结合王家岭12307掘进面实际,采用Fluent软件模拟压风筒出口风流角度和压抽比作用下巷道内粉尘的运移特征,得出压风筒出口风流角度及压抽比在不同耦合方式下的影响效果;研究采用非稳态DPM模拟,实现粉尘运移规律的可视化。结果表明:当压风筒出口风流角度不变时,除尘效率随压抽比增大而提高;当压抽比不变时,迎头处涡流随着压风筒出口风流角度的增加逐渐减弱;当压风筒出口风流角度为60°,压抽比为0.67时,除尘效果最佳。

Conventional long distance forced and short distance exhausted ventilation system create vortexes at the head, which increases the further dust accumulation and circulation. For this problem, this paper proposes a long pressure short drainage dust removal system that can change the angle of air flow at the outlet of the pressurized air cylinder. Combined with the actual situation of 12307 heading face of Wangjialing Coal Mine, the software Fluent was used to simulate the migration characteristics of dust in the roadway under the action of the air flow angle at the outlet of the pressure air duct and the pressure pumping ratio,and the effects of the air flow angle at the outlet of the pressure air duct and the pressure pumping ratio under different coupling modes were obtained. The study adopts non-stationary simulation to visualize the dust transport law. The results show that the dust removal efficiency increases with the increase of the pressure pumping ratio when the air flow angle at the outlet of the pressure duct is unchanged. When the pressure pumping ratio is constant, the vortex at the head gradually weakens with the increase of the air flow angle at the outlet of the pressure duct. Therefore, when the air flow angle at the outlet of the pressure duct is 60° and the pressure pumping ratio is 0.67, the dust removal effect is the best.