scholarly journals A NEW SCALING STRATEGY OF BUBBLING FLUIDIZED BED REACTORS BASED ON POPULATION-BALANCE MODEL

2021 ◽  
Author(s):  
Robert Macias ◽  
Juan Maya ◽  
Farid Chejne ◽  
Carlos Londoño ◽  
Javier De La Cruz
Keyword(s):  
Fluidized Bed ◽  
Chemical Reactivity ◽  
Operating Conditions ◽  
Balance Model ◽  
Fluidized Bed Reactors ◽  
Dimensionless Number ◽  
Computational Simulations ◽  
Fluidization Regime ◽  
New Strategy ◽  
Bubbling Fluidized Bed

This work proposes a new strategy for the scaling of bubbling fluidized bed reactors. This strategy is based on the bubble size distribution, bubble coalescence phenomenon, and the chemical reactivity, allowing to deduct the dimensionless number Chejne-Macias-Maya that must remain constant at different scales to guarantee the fluidization regime. The proposed strategy is validated from computational simulations carried out at different operating conditions. Additionally, limits for the validity of this scaling strategy were determined, which agrees with those reported in the literature.

CFD-DEM Modeling of CO2 Capture using Alkali Metal-Based Sorbents in a Bubbling Fluidized Bed

2014 ◽  
Vol 12 (1) ◽  
pp. 441-449 ◽  
Author(s):  
Zhonglin Zhang ◽  
Daoyin Liu ◽  
Yaming Zhuang ◽  
Qingmin Meng ◽  
Xiaoping Chen
Keyword(s):  
Fluidized Bed ◽  
Gas Flow ◽  
Fluidized Bed Reactors ◽  
Solid Sorbents ◽  
Bubbling Fluidized Bed ◽  
Shrinking Core ◽  
Simulation And Experiment ◽  
Kinetics Simulation ◽  
Reaction Processes ◽  
Back Mixing

Abstract This paper describes a CFD-DEM modeling of CO2 capture using K2CO3 solid sorbents in a bubbling fluidized bed, which takes into heat transfer, hydrodynamics, and chemical reactions. Shrinking core model is applied in reaction kinetics. Simulation and experiment results of bed pressure drop and CO2 concentration in the reactor exit agree well. Instantaneous dynamics as well as time-averaged profiles indicate detailed characteristics of gas flow, particle motion, and chemical reaction processes. The simulation results show an obvious core-annular flow and strong back-mixing flow pattern. CO2 concentration decreases gradually along the bed height, while regards on the lateral distribution CO2 concentration near the wall is lower than that in the middle zone where gas passes through faster. The effect of bubbles on CO2 reaction is two-sided: it can promote mixing which strengthens reaction, while it can be a short pass of gas which is not beneficial to reaction. The simulation is helpful for further understanding and optimal design of fluidized bed reactors of CO2 capture.

scholarly journals Development and assessment of speed-up algorithms for the reactive CFD–DEM simulation of fluidized bed reactors

2020 ◽  
Vol 5 (2) ◽  
pp. 278-288 ◽  
Author(s):  
Riccardo Uglietti ◽  
Mauro Bracconi ◽  
Matteo Maestri
Keyword(s):  
Fluidized Bed ◽  
Selection Procedure ◽  
Operating Conditions ◽  
Fluidized Bed Reactors ◽  
Effective Algorithm ◽  
Dem Simulation ◽  
Dem Simulations ◽  
Speed Up

PA and ISAT algorithms are developed to speed-up the CFD–DEM simulations of fluidized reactors. Also, a selection procedure of the most effective algorithm according to the operating conditions is developed, enabling the simulation of lab reactors.

Pollutant emissions in a bubbling fluidized bed combustor working in oxy-fuel operating conditions: Effect of flue gas recirculation

2013 ◽  
Vol 102 ◽  
pp. 860-867 ◽  
Author(s):  
L.F. de Diego ◽  
M. de las Obras-Loscertales ◽  
A. Rufas ◽  
F. García-Labiano ◽  
P. Gayán ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Flue Gas ◽  
Operating Conditions ◽  
Pollutant Emissions ◽  
Flue Gas Recirculation ◽  
Bubbling Fluidized Bed ◽  
Gas Recirculation ◽  
Fluidized Bed Combustor
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