In order to avoid the bag filter in the use of the process of dust removal efficiency is too low or the equipment is high power with low use caused by waste,a three-dimensional modeling software was used to model the entire dust control system of the coal mine fly ash unloading bin transfer point equipped with a bag filter and a closed cover.The internal flow field was numerically simulated using CFD fluid dynamics software Fluent.By adjusting the wind speed at the exhaust port of the bag filter,the dust removal effect,required air volume,and total resistance of the entire system were obtained at different wind speeds.The optimal wind speed was selected to de-termine the suitable filter bag,fan,pipeline and other equipment for the system.The optimized equipment was applied in the field,and the dust concentration at the openings of the two ends of the closed cover was reduced from 607.4,54.7 mg/m3 to 3.7,0.3 mg/m3,re-spectively;the dust reduction efficiency reached 99.4％,99.5％,respectively;the dust removal effect meet the demand without waste.
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