Minimum spouting velocity of flat-base spouted fluid bed--颗粒学报PARTICUOLOGY

Monazam, E. R., Breault, R. W., Weber, J., & Layfield, K. (2018). Minimum spouting velocity of flat-base spouted fluid bed. Particuology, 36, 27-36. https://doi.org/10.1016/j.partic.2017.02.008

Minimum spouting velocity of flat-base spouted fluid bed

Esmail R. Monazam ^b, Ronald W. Breault ^a *, Justin Weber ^a, Ky Layfield ^b

a National Energy Technology Laboratory, U. S. Department of Energy, 3610 Collins Ferry Rd., Morgantown, WV 26507-0880, USA
b REM Engineering Services, PLLC, 3537 Collins Ferry Rd., Morgantown, WV 26505, USA

10.1016/j.partic.2017.02.008

Volume 36, February 2018, Pages 27-36

Received 5 October 2016, Revised 16 February 2017, Accepted 23 February 2017, Available online 3 July 2017, Version of Record 22 December 2017.

E-mail: ronald.breault@netl.doe.gov

Highlights

• Experiments were performed on the hydrodynamic characteristics of a spouted bed.

• The effects of bed height, particles type, gas velocity on U_ms and ΔP were investigated.

• A new correlation based on the present studies was proposed to predict U_ms.

• The results showed that the U_ms decreased with increasing fluidizing gas velocity.

Abstract

Experiments were performed on spout characteristics of a cylindrical spout-fluidized bed (I.D. = 10 cm) with different static heights and two materials (Al₂O₃and high density polyethylene). Results of minimum spouting velocity obtained in this study were compared with reported correlations for both spouted and spout-fluidized beds. Considerable discrepancies were found between the values obtained using different model equations as well as with respect to experimental results. Based on the Mathur–Gishler correlation, a new correlation is proposed for calculating the minimum spouting velocity that introduces the ratio U/U_mf. It was found that the minimum spouting velocity decreases with increasing fluidizing gas velocity (U/U_mf). The pressure drop at the point of minimum spouting velocity is also correlated using this dimensionless group and is presented in this work. This investigation demonstrates that the use of correlations reported in the literature that focus primarily on conical bottom spouted beds are not applicable to flat-bottom spouted and spout-fluidized beds.

Graphical abstract

Keywords

Spouted bedSpout-fluidized bedMinimum spouting velocityFlat-bottom spouted bed

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