期刊
POWDER TECHNOLOGY
卷 404, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.powtec.2022.117508
关键词
Micro gas-solid fluidized bed; Plug flow; Residence time distribution; Axial gas dispersion model; Gas backmixing
资金
- Ministry of Science and Technology of the People's Republic of China [2018YFE0103400]
- National Nat-ural Science Foundation of China [U1908201]
- abroad Joint Training Program for University of Liaoning [LNGXGYWPY-ZD002]
- Hirosaki University
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.
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.
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