Evaluation of vortex sheet on agglomerating and blocking fine dust in turbulence area

Abstract

ABSTRACTFine dust contributes to many physical diseases in coal miners, and it is hard to remove effectively. In this paper, the gas-solid two-phase flow theory and the discrete phase model are used to numerically simulate and analyze that the effects of velocity and the separation distance of vortex sheet to turbulence intensity, yield of vorticity, and particles trajectory. It can enhance the turbulent intensity and vorticity yield by setting up vortex sheets, so that the collision probability of particles increases. Entrance airflow velocity were 6, 9, 12 m·s−1, separation distance of vortex sheets were no sheets, 20 cm and 30 cm in conditions of simulation and experiment. By experiments, it was initially verified that the fine dust in the turbulent flow was agglomerated or blocked, and the efficiency of agglomeration and blocking was obtained. The efficiency of agglomeration and blocking was from 17.51% to 73.13%, and when the entrance airflow velocity was 12 m·s−1, separation distance was 20 cm, 73.13% was the highest efficiency. This will provide an idea for designing effective dust collector in mine, and help to solute fine dust pollution problems.