3D Numerical Study of Multiphase Counter-Current Flow within a Packed Bed for Post Combustion Carbon Dioxide Capture

The hydrodynamics within counter-current flow packed beds is of vital importance to provide insight into the design and operational parameters that may impact reactor and reaction efficiencies in processes used for post combustion CO2 capture. However, the multiphase counter-current flows in random packing used in these processes are complicated to visualize. Hence, this work aimed at developing a computational fluid dynamics (CFD) model to study more precisely the complex details of flow inside a packed bed. The simulation results clearly demonstrated the development of, and changes in, liquid distributions, wetted areas, and film thickness under various gas and liquid flow rates. An increase in values of the We number led to a more uniform liquid distribution, and the flow patterns changed from droplet flow to film flow and trickle flow as the We number was increased. In contrast, an increase in gas flow rate had no significant effect on the wetted areas and liquid holdup. It was also determined that the number of liquid inlets affected flow behavior, and the liquid surface tension had an insignificant influence on pressure drop or liquid holdup; however, lower surface tension provided a larger wetted area and a thinner film. An experimental study, performed to enable comparisons between experimentally measured pressure drops and simulation-determined pressure drops, showed close correspondence and similar trends between the experimental data and the simulation data; hence, it was concluded that the simulation model was validated and could reasonably predict flow dynamics within a counter-current flow packed bed.

[1]  R. V. Edwards,et al.  A New Look at Porous Media Fluid Mechanics — Darcy to Turbulent , 1984 .

[2]  H. Lasa,et al.  Effect of distributor designs on the flow development in downer reactor , 1999 .

[3]  A. Attou,et al.  A two-fluid model for flow regime transition in gas–liquid trickle-bed reactors , 1999 .

[4]  Phillip Colella,et al.  A numerical model for trickle bed reactors , 2000 .

[5]  Erik Damgaard Christensen,et al.  Large eddy simulation of breaking waves , 2001 .

[6]  M. A. Latifi,et al.  Analysis of two-phase flow distribution in trickle-bed reactors , 2001 .

[7]  Wuqiang Yang,et al.  Tomography for multi-phase flow measurement in the oil industry , 2005 .

[8]  Vivek V. Ranade,et al.  Hydrodynamics of Trickle-Bed Reactors: Experiments and CFD Modeling , 2005 .

[9]  Christopher J. Elkins,et al.  Magnetic resonance velocimetry: applications of magnetic resonance imaging in the measurement of fluid motion , 2007 .

[10]  B. Mahr,et al.  CFD Modelling and Calculation of Dynamic Two-Phase Flow in Columns Equipped with Structured Packing , 2007 .

[11]  Pierre Sagaut,et al.  Towards large eddy simulation of isothermal two-phase flows: Governing equations and a priori tests , 2007 .

[12]  Mathieu Weber,et al.  Wire mesh tomography applied to trickle beds: A new way to study liquid maldistribution , 2008 .

[13]  T. Nejat Veziroglu,et al.  “Green” path from fossil-based to hydrogen economy: An overview of carbon-neutral technologies , 2008 .

[14]  Pierre Sagaut,et al.  Numerical simulation of phase separation and a priori two-phase LES filtering , 2008 .

[15]  Vivek V. Ranade,et al.  Liquid Distribution and RTD in Trickle Bed Reactors: Experiments and CFD Simulations , 2008 .

[16]  Rodrigo J. G. Lopes,et al.  CFD modelling of multiphase flow distribution in trickle beds , 2009 .

[17]  Paul Feron,et al.  Exploring the potential for improvement of the energy performance of coal fired power plants with post-combustion capture of carbon dioxide , 2010 .

[18]  J. Repke,et al.  Experimental and Numerical Investigation on Gravity-Driven Film Flow over Triangular Corrugations , 2013 .

[19]  S. Liu,et al.  Experiment and model for the surface tension of carbonated MEA–MDEA aqueous solutions , 2013 .

[20]  S. Gu,et al.  3D modeling of hydrodynamics and physical mass transfer characteristics of liquid film flows in structured packing elements , 2013 .

[21]  F. Liu,et al.  Cerium Oxide Promoted Iron-based Oxygen Carrier for Chemical Looping Combustion , 2014 .

[22]  Kozo Saito,et al.  Scale Modeling in the Age of High-Speed Computation , 2015 .

[23]  F. Liu,et al.  Scale-Up of Chemical Looping Combustion , 2015 .

[24]  Bingtao Zhao,et al.  Post-combustion CO2 capture with ammonia by vortex flow-based multistage spraying: Process intensification and performance characteristics , 2016 .

[25]  Liangxing Li,et al.  Investigations on two-phase flow resistances and its model modifications in a packed bed , 2017 .

[26]  Andreas Jupke,et al.  Development of a CFD model for the simulation of a novel multiphase counter-current loop reactor , 2017 .

[27]  H. Albazzaz,et al.  Identification of Flow Regime in a Cocurrent Gas-Liquid Upflow Moving Packed Bed Reactor using Gamma Ray Densitometry , 2017 .