Effect of structure parameters on forces acting on baffles used in gas–solids fluidized beds--颗粒学报PARTICUOLOGY

Liu, D., Zhang, Y., Zhang, S., & Oloruntoba, A. (2022). Effect of structure parameters on forces acting on baffles used in gas–solids fluidized beds. Particuology, 61, 111-119. https://doi.org/10.1016/j.partic.2021.01.020

Effect of structure parameters on forces acting on baffles used in gas–solids fluidized beds

Duiping Liu ^{a b}, Yongmin Zhang ^b *, Shuhao Zhang ^b, Adefarati Oloruntoba ^b

a Dalian National Laboratory for Clean Energy, National Engineering Laboratory for MTO, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
b State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

10.1016/j.partic.2021.01.020

Volume 61, February 2022, Pages 111-119

Received 19 March 2020, Revised 18 October 2020, Accepted 26 January 2021, Available online 31 March 2021, Version of Record 27 October 2021.

E-mail: zhym@cup.edu.cn

Highlights

• The slat pitch is an key parameter to determine the forces acting on the baffles.

• The gas cushion plays an important role in reducing forces on the baffles.

• The forces on the slats are quite different due to the guiding role of the baffles.

Abstract

Effects of some important structural parameters, i.e. slat pitch, and layout position, on dynamic forces acting on the baffles were examined in the fluidized bed of FCC particles operating under different superficial gas velocities. The experimental baffles were made of multiple inclined slats. We found that the forces acting on the baffles decreased significantly with reducing pitch between the slats. For the baffles with a small slat pitch, the forces acting on the baffles increased slightly and then decreased with increasing superficial gas velocity, which is very different from the measured results of a single slat or tube immersed in fluidized beds. The different results are greatly related to the appearance of the “gas cushion” beneath the baffles, whose height increases with increasing superficial gas velocity. On the other hand, a region with stronger particle circulation induced by the inclined slat array was observed in the experiments. The slat near the wall and located below the region of downward-flowing particles was found to be subjected to the severest forces. Therefore, the slats located in similar locations of industrial baffles are suggested to be reinforced to increase their structural strength.

Graphical abstract

Keywords

Baffle; Experiment; Fluidized bed; ForceSlat

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