半封闭水雾降尘过程中粉尘运移规律的研究

Study on dust transport law in the process of dust reduction by semi closed water mist

针对井下皮带转载破碎点空间较小、粉尘浓度大的特点,提出了半封闭式水雾防降尘技术,利用Fluent数值模拟方法,分析半封闭空间内的粉尘运移规律,并在柴家沟42222工作面对井下皮带转载点进行了现场应用,结果表明:半封闭空间内的粉尘运移轨迹主要集中在中下部,粉尘在装置漏风口处形成涡流,受涡流效应影响大部分漂浮粉尘被捕捉在装置内部,有效的减少了转载机附近粉尘浓度;在下方皮带和装置的缝隙处,受重力作用和粉尘运移规律的影响会出现粉尘大量沉降现象。本文提出改进措施是:在装置的漏风口处加装向内水雾喷头,防止粉尘向外扩散,同时浸润装置内壁,使粉尘贴附在内壁,提高装置的降尘效率。

According to the characteristics of small space and large dust concentration of underground belt transfer breaking point,a semi closed water mist anti dust technology was proposed.The dust migration law in the semi closed space was analyzed by using Fluent numerical simulation method.The law has been verified at the belt transfer point of Chaijiagou 42222 face.The results show that the dust migration trajectory in the semi enclosed space is mainly concentrated in the middle and lower part,and the dust forms a vortex at the air leakage port of the device.Affected by the vortex effect,most of the floating dust is captured in the device,which effectively reduces the dust concentration near the transfer machine.At the gap between the lower belt and the device,a large amount of dust will settle under the influence of gravity and dust migration law.In order to improve this situation,it is proposed to install an inward water mist nozzle at the air leakage port of the device to prevent the outward diffusion of dust.At the same time,water infiltration is used on the inner wall of the device to make the dust adhere to the inner wall,so as to improve the dust reduction efficiency of the device.