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Multiscale CFD Simulation for DTFB Scale-Up

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Diameter-Transformed Fluidized Bed

Part of the book series: Particle Technology Series ((POTS,volume 27))

Abstract

This chapter introduces an energy-minimization multiscale-based computational fluid dynamics approach and its application to the simulation of industrial-scale diameter-transformed fluidized bed (DTFB) reactors. The effects of geometrical and operating factors are numerically investigated to search for the optimal design of DTFB reactors for the maximizing iso-paraffins (MIP) process. The simulation results indicate that the geometrical factors including the configurations of the exit tube, feeding tube, and distributor do not strongly affect the macroscopic flow state in the expanded second section, but are important to maintain a steady transition between the two neighboring sections. The simulation accurately predicts the flow regime transition, in particular, the choking phenomenon, in a series of curves relating the solids flux and solids inventory at specified operating gas velocities. The simulation results can be used to determine the optimal operating conditions and diameter ratio of the expanded second reaction zone to the first reaction zone. A reactive simulation of a 120-Mt/a DTFB reactor for the MIP process further reveals the variation of velocities, temperature, and product species with the reactor height. Results and challenges to the scale-up of this reactor are then discussed.

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Authors and Affiliations

  1. Institute of Process Engineering, Chinese Academy of Sciences, Beijing, China

    Bona Lu & Wei Wang

  2. University of Chinese Academy of Sciences, Beijing, China

    Bona Lu & Wei Wang

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  1. Bona Lu
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  2. Wei Wang
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Correspondence to Bona Lu .

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Lu, B., Wang, W. (2020). Multiscale CFD Simulation for DTFB Scale-Up. In: Diameter-Transformed Fluidized Bed. Particle Technology Series, vol 27. Springer, Cham. https://doi.org/10.1007/978-3-030-47583-3_4

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