Numerical simulation Study of Dust Concentration Distribution Regularity in Cavern Stope

摘要

Based on the theory of gas-solid two-phrase flow and the characteristics of cavern stope a model of dust migration was established. The dust concentration changing of cavern stope by ventilation in 20 minutes after blasting and the dust trajectory in different wind speed were simulated by Fluent Software. The results show that distribution of dust concentration is significantly affected by flow field of airway in cavern, and the dust concentration of inlet is higher than that of outlet and the highest one on the corner of inlet's side. In the stope, the smaller the wind speed of inlet is, the shorter of dust can be captured, settled and discharged, the more obviously affected by the trajectory of gas flow field. It goes into the stage of clean cycle emissions after 60s, the speed of dust concentration dropped is the biggest between 0s and 70s, the main dust in stope is respirable dust after 70s, it needs much time to settlement.