Research on Enhanced Dust Removal Using Air Curtain in Conjunction with Exhaust Hood Based on CFD-DPM
Taking a mechanical factory's grinding workshop as the research object,a model of the grinding workshop equipped with a air curtain in conjunction with an exhaust hood for dust removal was established using Solidworks software.Based on the gas-solid two-phase flow theory,the computational fluid dynamics-discrete particle model(CFD-DPM)was adopted to simulate and analyze the influence of air curtain supply air velocity,jet angle and jet width on dust removal efficiency,thereby selecting the optimal parameters for the air curtain.On this basis,the wind speed distribution,dust migration trajectory and dust mass concentration distribution were compared and analyzed under three working conditions of not opening the dust extraction hood,opening the dust extraction hood,opening the dust extraction hood and air curtain.The effectiveness of dust removal using the air curtain in conjunction with the exhaust hood was explored.The results show that the maximum dust concentration and respiratory zone dust concentration decrease with the increase of the air velocity and the jet width of the air curtain,but do not change with variations in the jet angle of the air curtain.The dust concentration first increases and then decreases with the increase of height from the ground,showing a consistent trend at different heights.When the air curtain jet width is 30 mm,the jet angle is 30°,and the air velocity is 3 m/s,the ventilation and dust removal effect is the optimal,achieving a dust removal efficiency of up to 94.2%.Compared to operating the exhaust hood alone,the dust removal efficiency increases by 38.8%when the dust extraction hood and the air curtain work together,demonstrating that the air curtain in conjunction with the exhaust hood significantly enhances dust removal in the workshop.
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