煤矿风井排风口除尘装置除尘效率的数值模拟

在某矿风井排风口安装了惯性重力除尘装置,安装该装置后,周围的环境得到大大的改善.运用数值模拟的方法计算该除尘装置的除尘效率.结果表明:该惯性重力除尘器的导风口处,从上至下气流速度逐渐减小,增加最下部导风口的面积,可以增大对小粒径颗粒的捕集量;在该惯性重力除尘器中,颗粒浓度最大的地方是在扩散塔外圆弧面附近,在紧连外圆弧面一侧的导流叶片中,最低的导流叶片出口处,颗粒的浓度很大;随着颗粒粒径的增加,惯性重力除尘器的除尘效率显著增加,对于120μm以下的颗粒,该除尘装置的除尘效率低于50%.

Numerical simulation on collection efficiency of dust collector in mine airshaft outlet

Inertia -gravity dust collector is installed in a mine airshaft outlet. The surrounding environment much improves after installing the device. The way of numerical simulation is used to calculate the collection efficiency of dust collector. The results show： the flow velocity decreases gradually from top to bottom at the guide outlet of inertia - gravity dust collector, increasing the area of lower guide outlet can increase the amount of small size particles captured ; maximum particle concentration region is near the outer arc surface of diffusion tower in the inertia - gravity dust collector. At the lowest guide outlet of vanes abutting the outer arc surface, particle concentration is very large; the collection efficiency of inertia - gravity dust collector increases significantly with the increase of particle size, but collection efficiency of inertia - gravity dust collector is less than 50% for particles below 120μm.