Dynamic segregation behavior and its impact on dry beneficiation of fine coal in a gas-solid fluidized bed

Abstract

This study investigates the dynamic segregation behavior of fine raw coal in a gas-solid fluidized bed and its impact on dry beneficiation performance. While stratification by density and size is well known in fluidized systems, little attention has been paid to the temporal instability of segregation boundaries and how it affects product quality in practical separation processes. Building on previous work that identified an optimal fluidization velocity (u0/umf = 2.0) for separation efficiency, this study focuses on how the bed structure evolves over varying fluidization durations. Bulk density, particle size distribution, calorific value, and ash content were measured across 10 vertical la..