Structural optimization of a radial microchannel separator applied to the filtration of PM2.5

Fine particulate matter (PM_2.5) is difficult to separate due to its small particle size, the microchannel separator demonstrates excellent separation performance, while structural design and bed regeneration are the difficulties. In this study, the velocity and pressure drop in the axial and radial microchannel separator were compared by computational fluid dynamics—discrete element method coupling model (CFD-EDEM), and the effects of different structural parameters on the separation performance were explored in depth experimentally to enhance the separation of PM_2.5. The results show that the radial microchannel separator wins by having a lower pressure drop, giving it a significant advantage in energy consumption. The average PM_2.5 removal efficiency of the radial microchannel separator is as high as 97.17 % and a pressure drop of only 1.76 kPa. Moreover, the in-situ regeneration efficiency of granular bed medium can reach 63.48 %. This study provides an essential reference for the purification of PM_2.5 in high temperature smoke and the optimization of the structural parameters of the microchannel separator.