Effect of successive sprays on liquid distribution in fluidized beds--颗粒学报PARTICUOLOGY

Briens, C., Reyes, L. P., Berruti, F., & McMillan, J. (2021). Effect of successive sprays on liquid distribution in fluidized beds. Particuology, 54, 17-24. https://doi.org/10.1016/j.partic.2020.10.010

Effect of successive sprays on liquid distribution in fluidized beds

Cedric Briens ^a *, Liliana Pardo Reyes ^a, Franco Berruti ^a, Jennifer McMillan ^b

a Institute for Chemicals and Fuels from Alternative Resources, Western University, 22312 Wonderland Rd., Ilderton, ON, N0M 2A0, Canada
b Edmonton Research Centre, Syncrude Canada Ltd, 9421 17th Ave, Edmonton, AB, T6N 1H4 Canada

10.1016/j.partic.2020.10.010

Volume 54, February 2021, Pages 17-24

Received 9 July 2018, Revised 28 September 2020, Accepted 9 October 2020, Available online 23 November 2020, Version of Record 28 January 2021.

E-mail: cbriens@uwo.ca

Highlights

• A gum arabic aqueous solution simulates agglomerate formation in Fluid Coking.

• Wet particles number increases by 50% through transfer from wet to dry particles.

• More of the injected liquid is trapped in agglomerates with successive injections.

Abstract

In processes such as Fluid Coking™, agglomerate formation should be minimized since it reduces the yield of valuable products, and degrades operability because of the fouling of internals. An experimental model, consisting of an aqueous solution of gum arabic with a dye, has been successfully developed to simulate the formation of agglomerates in the Fluid Coking™ process, where bitumen is sprayed into a fluidized bed of coke particles The particles wetted by a spray could be predicted by assuming that all the particles in the wake of bubbles formed from the tip of the spray jet have been wetted by the injected liquid. The transfer of liquid from particles wetted with the spray to dry bed particles was relatively ineffective, as the number of wet particles increased by only 50%. With successive liquid injections, the proportion of the liquid trapped in agglomerates increases in latter injections: large agglomerates from earlier injections accumulate above the grid and are carried by gas bubbles into the spray jet cavity, where they seed fresh agglomerates.

Graphical abstract

Keywords

Fluidized bed; Liquid injection; Agglomerate formation; Fluid Coker

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