Lu X, Tan JZY, Maroto-Valer MM. Investigation of CO2 Photoreduction in an Annular Fluidized Bed Photoreactor by MP-PIC Simulation.
Ind Eng Chem Res 2022;
61:3123-3136. [PMID:
35431432 PMCID:
PMC9007463 DOI:
10.1021/acs.iecr.1c04035]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Revised: 01/23/2022] [Accepted: 01/25/2022] [Indexed: 11/29/2022]
Abstract
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Carbon dioxide (CO2) photoreduction is a promising process
for both mitigating CO2 emissions and providing chemicals
and fuels. A gas–solid two-phase annular fluidized bed photoreactor
(FBPR) would be preferred for this process due to its high mass-transfer
rate and easy operation. However, CO2 photoreduction using
the FBPR has not been widely researched to date. The Lagrangian multiphase
particle-in-cell (MP-PIC) simulation with computational fluid dynamic
models is a new and robust approach to explore the multiphase reaction
system in the gas–solid fluidized bed. Therefore, the purpose
of this paper is to investigate CO2 photoreduction in the
FBPR by MP-PIC modeling to understand the intrinsic mechanism of solid
flow, species mass transfer, and CO2 photoreaction. The
MP-PIC models for solid flow in the FBPR were validated by the bed
expansion height and bubble size. The results showed the particle
stress of the Lun model, the drag of the Ergun-WenYu (Gidaspow) model,
and the coefficient of restitution e = 0.95 with
the wall parameters ew = 0.9 and μw = 0.6 are the best fit to the experimental empirical correlations.
The MP-PIC models developed in this work proved to be better than
the Eulerian two-fluid modeling in the prediction of the bed expansion
height and bubble size. It was also found from the simulation results
that the maximum radiation intensity is in the half reactor height
area, and the photocatalytic reaction mainly occurred around the inner
wall. It showed that the gas velocity and catalyst loading were two
crucial operating parameters to control the process. The results reported
here can provide guidance for the operation and reactor design of
the CO2 photoreduction process.
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