Further analysis of the near-plug gas flow conditions in micro gas-solid fluidized beds

This work presents a theoretical analysis of the near-plug gas flow conditions in micro gas-solid fluidized beds based on the simple one-dimensional dispersion model. The analysis is validated by comparison with the experimental results reported in the literature. It concludes that gas flows can be considered near-plug flow only when: 1) the gas RTD curve is symmetrically shaped; 2) the product of RTD peak height E(t)(h) and variance sigma(t) (i.e., E(t)(h)sigma(t)) approximates 0.4; and 3) E(t)h is greater than 1.0 s(-1) (dimensionless E-theta,E-max > 2.82) or sigma(2)(t) < 0.25 s(2) (and (dimensionless sigma(2)(theta) > 0.02). This work further improves the criterion for the near-plug flow of gas in micro fluidized beds originally proposed by Geng et al. (CEJ, 351 (2018) 110-118).(C) 2022 Elsevier B.V. All rights reserved.

Automated summary

This work presents a theoretical analysis of the near-plug gas flow conditions in micro gas-solid fluidized beds using a simple one-dimensional dispersion model. The analysis is validated by comparing it with experimental results. The study improves the criterion for near-plug gas flow in micro fluidized beds and has important implications for further research and design of micro fluidized beds.