School of Safety and Emergency Management Engineering, Taiyuan University of Technology

针对煤矿综掘工作面粉尘浓度超限的问题，设计了一种新型内外双旋流风幕发生装置，通过数值模拟和相似试验分析了装置应用前后综掘工作面的风流流场特性和粉尘扩散规律。结果表明：司机位置粉尘质量浓度随风幕发生装置射流出口风速的增大呈先降低后增大的变化趋势，有效控尘临界风速为35 m/s；风幕发生装置可以形成阻挡粉尘向外扩散的漏斗状旋流风幕，并将综掘工作面分成粉尘控制区和工作区2部分；旋流风幕将粉尘颗粒的扩散速度降低了84%，且对5 μm以下呼吸性粉尘控尘效率更优；新型风幕发生装置应用后司机位置处的粉尘质量浓度由337 mg/m3降到38 mg/m3，控尘效率为88.7%。

In response to the problem of excessive dust concentration at the coal mine heading face, a new type of internal and external dual swirl air curtain generator was designed. Numerical simulations and similar tests were carried out to investigate the characteristics of the wind flow field and the dust dispersion pattern at the heading face before and after the application of the device. The results show that the dust concentration at the driver’s position decreases first and then increases with the increase of the jet outlet airflow velocity of air curtain generator, and the empirical relationship between the dust concentration at the driver’s position and the jet outlet airflow velocity is proposed, and a critical wind speed of 35 m/s was determined for effective dust control. The wind curtain generator can form a funnel-shaped swirling air curtain to prevent dust from spreading outwards, and divide the working face into two parts of dust control area and work area. The swirl air curtain reduces the diffusion speed of dust particles by 84% and has a better dust control effect for respirable dust below 5 μm; after the installation of the new swirl air curtain generator, the dust concentration at the driver’s position of the road header is reduced from 337 mg/m3 to 38 mg/m3.

国家自然科学基金资助项目（51774168）

马莲，李雨成，任建业，等. 综掘工作面内外双旋流风幕发生装置设计与控尘效果研究[J]. 煤矿安全，2023，54（11）：188−197.

MA Lian, LI Yucheng, REN Jianye, et al. Designing and dust control performance of internal and external dual swirl air curtain in fully mechanized excavation face[J]. Safety in Coal Mines, 2023, 54（11）: 188−197.