栅-网耦合净化电焊烟尘的正交试验模拟

Orthogonal experimental simulation of grid-net coupling purification of welding fume

为了探究对电焊烟尘高效、低耗、低投入的处理方法,基于正交模拟方式对栅-网耦合过滤过程进行研究,得到影响除尘效率主要因素,以确定模拟条件下的最优工况组合。以振弦栅数量、栅-网间距、入口风速和金属丝网等效过滤孔径为耦合正交变量,选择CFD软件建立物理模型并进行网格划分,利用FLUENT计算软件对栅-网耦合正交试验的相关参数进行模拟计算。研究结论表明:4种正交参数对过滤效率的影响程度为:金属丝网等效过滤孔径>振弦栅数量>入口风速>栅-网间距;在考虑过滤压降的情况下,两块振弦栅,栅-网间距为20 mm,金属丝网等效孔径为1μm的栅-网耦合过滤系统在入口风速为3.0 m/s时对电焊烟尘的过滤效果最明显。

The grid-mesh coupling filtration process was studied based on orthogonal simulation methods in order to explore the efficient treatment methods with low-consumption and low-input for welding fume,and the main factors affecting the dust removal efficiency were obtained to determine the optimal combination of working conditions under simulated conditions.Taking the number of vibrating wire grids,grid-mesh spacing,inlet wind speed and wire mesh equivalent filter aperture as coupling orthogonal variables,CFD software is selected to establish the physical model and mesh,and FLUENT calculation software is adopted to orthogonally couple the grid-mesh.The relevant parameters of the experiment are simulated and calculated.The conclusion of the study shows that the order of the effects of the four orthogonal parameters on the filtration efficiency is:the equivalent filtration aperture of the wire mesh>the number of vibrating wire grids>the inlet wind speed>the grid-mesh spacing;considering the filter pressure drop,the grid coupling filter system with string-grid,grid-mesh spacing of 20 mm and wire mesh equivalent pore size of 1μm has the most obvious filtering effect on welding fume when the inlet wind speed is 3.0 m/s.