Abstract:The port dust pollution originates from both the static dust generation and the dynamic dust generation.While the significant progress has been made in using computational fluid dynamics（CFD）numerical simulations to study the static dust generation at ports,research on the dynamic dust generation is still in a development phase,with limited consideration of factors such as the stacker-reclaimer rotational speed and wind conditions.Therefore,combining the discrete element method（DEM）with CFD holds great potential for studying the dust generation at ports.We focus on coal stockpiles at a dry bulk cargo terminal in Jiangsu and the WUD 400/700 coal bucket wheel reclaimer,and use CFD-DEM coupled simulations to study the impact of reclaimer operations on the dynamic dust generation.The results show that the dust generation increases exponentially with both the reclaimer speed and the wind speed.It is recommended to operate at 8-9 r/min rotational speed to balance economic and environmental benefits.The dust generation first increases and then decreases with changes in wind direction.It is suggested that the effect of wind direction on dust generation is added as a consideration when applying traditional empirical formulas for dynamic dust emission,and to appropriately revise the formula on the basis of measured and experimental data.
