Effect of a pulsating flow on hydrodynamics and fluid catalytic cracking chemical reaction in a circulating fluidized bed riser--颗粒学报PARTICUOLOGY

Chaiwang, P., Chitcharoenyoo, H., Piumsomboon, P., & Chalermsinsuwan, B. (2022). Effect of a pulsating flow on hydrodynamics and fluid catalytic cracking chemical reaction in a circulating fluidized bed riser. Particuology, 67, 47-56. https://doi.org/10.1016/j.partic.2021.10.002

Effect of a pulsating flow on hydrodynamics and fluid catalytic cracking chemical reaction in a circulating fluidized bed riser

Pilaiwan Chaiwang ^a, Hannarong Chitcharoenyoo ^b, Pornpote Piumsomboon ^{a c}, Benjapon Chalermsinsuwan ^{a c d *}

a Fuels Research Center, Department of Chemical Technology, Faculty of Science, Chulalongkorn University, 254 Phyathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand
b Program in Petrochemistry and Polymer Science, Faculty of Science, Chulalongkorn University, 254 Phyathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand
c Center of Excellence on Petrochemical and Materials Technology, Chulalongkorn University, 254 Phyathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand
d Advanced Computational Fluid Dynamics Research Unit, Chulalongkorn University, 254 Phyathai Road, Wangmai, Pathumwan, Bangkok 10330, Thailand

10.1016/j.partic.2021.10.002

Volume 67, August 2022, Pages 47-56

Received 21 July 2021, Revised 4 October 2021, Accepted 5 October 2021, Available online 28 October 2021, Version of Record 30 November 2021.

E-mail: benjapon.c@chula.ac.th

Highlights

• Three-dimensional fluidized bed with pulsating flow was modeled successfully.

• Pulsating flow provided higher conversion and yield than non-pulsating flow.

• Frequency and types of the waveform were important pulsating operating parameters.

• Sine-shaped waveform gave uniformly axial solid distribution than squared-shaped.

• Regression models to optimize reaction conversion and yield were established.

Abstract

The three-dimensional computational fluid dynamics (3D-CFD) of a pulsating flow applied to the fluid catalytic cracking (FCC) reaction was investigated in the riser of a circulating fluidized bed reactor. The kinetic parameters of the FCC and coke burning reactions for predicting the reactant conversion and product yield percentages were applied. To increase the reactant conversion level and product yield, the effect of the pulsating flow operating parameters was considered using a 2^k statistical experimental design with four factors (amplitude, frequency, types of the waveform, and amplitude ratio). The 3D-CFD simulation was successfully validated from the experimental literature data. The frequency and type of the waveform were found to be the significant operating parameters. The expression of the fitted regression model and response surface contour were derived and revealed that the pulsating flow provides a higher reactant conversion level and product yield percentages compared to a non-pulsating or steady flow.

Graphical abstract

Keywords

Fluid catalytic cracking; Circulating fluidized bed riser; Computational fluid dynamics; Pulsating; Statistical experimental design

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