综掘面抽风口调控下的旋流风幕降尘优化

Optimization of cyclone air curtain dust control under control of exhaust outlet on fully mechanized excavation face

为提高煤矿综掘面粉尘防治技术水平,通过旋流风幕与抽风口的协同作用优化风流减少粉尘聚集,改善工作面通风环境。将附壁风筒和自主研制的风流调控装置相结合,设计混合式通风下的旋流风幕与抽风口风流调控系统。首先,利用数值模拟方法,分析附壁风筒条缝宽度、轴径风量比和抽风口口径、偏转角度单参数变化对粉尘运移分布的影响;其次,采用粒子群优化算法(PSO),求解得到司机及行人位置粉尘双目标优化的最优调控方案;最后,分别通过数值模拟和搭建的调控降尘试验平台测试验证最优方案优化效果。结果表明:调控后司机位置粉尘质量浓度降低41.5%;回风侧行人呼吸带平均粉尘质量浓度降低64.2%,物理试验与数值模拟的降尘优化效果基本一致,验证了旋流风幕与抽风口综合降尘方法的有效性。

In order to improve the dust control technology of the coal mine heaving face,the synergistic effect of swirling air curtain and air outlet was adopted to optimize the airflow to reduce dust accumulation and improve the ventilation environment of the working face.Combining the attached wall blower and the self-developed airflow control device,the cyclone air curtain and the airflow control system of the extract air outlet under the hybrid ventilation were designed.Firstly,numerical simulation was used to study the influence law of dust transport and distribution caused by the slit width of the wall duct,shaft diameter air volume ratio and suction port diameter,and single parameter variation of deflection angle.Secondly,the particle swarm optimization(PSO)algorithm was used to obtain the optimal control scheme of dual objective optimization of dust in driver and pedestrian positions.Finally,numerical simulation and dust control test platform were built to verify the optimization effect of the optimal solution.The results showed that the dust concentration in the driver's position was reduced by 41.5%,and the average dust concentration of the pedestrian breathing belt at the return air side was reduced by 64.2%.The optimized effect of dust reduction from physical experiments and numerical simulations was in general agreement.The effectiveness of the comprehensive dust removal method of swirling air curtains and air outlets is verified.