CFD Modelling of CO2 Capture in a Packed Bed by Chemical Absorption

Asendrych, Dariusz; Niegodajew, Paweł; Drobniak, S.

doi:10.2478/cpe-2013-0022

Cited by 41 publications

(26 citation statements)

References 19 publications

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“…1). The process is reversed in a stripper, allowing to release captured CO 2 which is then compressed and transported to the storage location [7]. Monoethanolamine (MEA) is the most widely used solvent in PCC, generally due to its high reactivity and commonly available comprehensive database of its physical properties [3].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of CO2 capture efficiency in post combustion CCS technology in terms of varying flow conditions

Niegodajew¹,

Asendrych²,

Drobniak³

2013

Archives of Thermodynamics

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The paper deals with the computational fluid dynamics modelling of carbon dioxide capture from flue gases in the post combustioncapture method, one of the available carbon capture and storage technologies. 30% aqueous monoethanolamine solution was used as a solvent in absorption process. The complex flow system including multiphase countercurrent streams with chemical reaction and heat transfer was considered to resolve the CO2 absorption. The simulation results have shown the realistic behaviour and good consistency with experimental data. The model was employed to analyse the influence of liquid to gas ratio on CO2 capture efficiency. Nomenclature a -surface area, m 2 /m 3 A -cross sectional area of absorber column, m 2 C -molar concentration, kmol/m 3 Cs -constant in Eq. (5) Er -enthalpy source term, W/m 3 F -phase interaction force, N/m 3 P. Niegodajew, D. Asendrych and S. Drobniak g -gravitational acceleration, m/s 2 G -mass flux of gas phase, kg/s h -specific enthalpy, J/kg h l -liquid holdup, m 3 /m 3 J -flux of species diffused, kg/(m 3 s) k f -forward reaction rate constant, m 3 /(kmol s) L -mass flux of liquid phase, kg/s M -molecular weight, kg/kmol MB -momentum sink term in porous zone, N/m 3 p -static pressure, Pa Q -heat flux exchanged between phases, W/m 3 Q -CO2 mass flux, kg/s R -heterogeneous reaction rate, kg/(m 3 s) R -mass source term, kg/(m 3 s) t -time, s T -temperature, K u -velocity, m/s V -volume flux, m 3 /s y -axial coordinate, m Y -mass fraction, kg/kgGreek symbols α -volume fraction, m 3 /m 3 α -CO2 loading, mol CO2/mol MEA λ -thermal conductivity, W/(m K) ε -porosity, m 3 /m 3 η -CO2 capture efficiency, % µ -dynamic viscosity, Pa s ξ -drag coefficient ρ -density, kg/m 3

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Section: Introductionmentioning

confidence: 99%

Numerical analysis of CO2 capture efficiency in post combustion CCS technology in terms of varying flow conditions

Niegodajew¹,

Asendrych²,

Drobniak³

2013

Archives of Thermodynamics

Self Cite

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“…There are a few studies on Euler-Euler multiphase model of CO 2 capture reactors, where chemical reaction and heat transfer are considered. Using Euler-Euler multiphase model [7], simulate CO 2 capture by amine solvent from flue gases, showing that CO 2 capture efficiency is mostly influenced by the ratio of aqueous amine solution to flue gases mass fluxes. Gabrielsen et al [8] use a rate-based formulation to model a CO 2 absorption in to a 2-amino-2-methyl-1-propanol (AMP) and the model has been successfully validated against pilot-plant data from the literature.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang¹,

Liu

Zhuang

et al. 2014

International Journal of Chemical Reactor Engineering

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This paper describes a CFD-DEM modeling of CO 2 capture using K 2 CO 3 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 CO 2 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 coreannular flow and strong back-mixing flow pattern. CO 2 concentration decreases gradually along the bed height, while regards on the lateral distribution CO 2 concentration near the wall is lower than that in the middle zone where gas passes through faster. The effect of bubbles on CO 2 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 CO 2 capture.

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“…The method was presented in detail using numerical modelling in (Asendrych et al, 2013). It is a highly energy-intensive process because a large heat flux is required to regenerate the CO 2 -amine solution.…”

Section: Co 2 Reductionmentioning

confidence: 99%

Investigation of a combined gas-steam system with flue gas recirculation

Chmielniak

Mońka

Pilarz

2016

Chemical and Process Engineering

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This article presents changes in the operating parameters of a combined gas-steam cycle with a CO 2 capture installation and flue gas recirculation. Parametric equations are solved in a purpose-built mathematical model of the system using the Ebsilon Professional code. Recirculated flue gases from the heat recovery boiler outlet, after being cooled and dried, are fed together with primary air into the mixer and then into the gas turbine compressor. This leads to an increase in carbon dioxide concentration in the flue gases fed into the CO 2 capture installation from 7.12 to 15.7%. As a consequence, there is a reduction in the demand for heat in the form of steam extracted from the turbine for the amine solution regeneration in the CO 2 capture reactor. In addition, the flue gas recirculation involves a rise in the flue gas temperature (by 18 K) at the heat recovery boiler inlet and makes it possible to produce more steam. These changes contribute to an increase in net electricity generation efficiency by 1%. The proposed model and the obtained results of numerical simulations are useful in the analysis of combined gas-steam cycles integrated with carbon dioxide separation from flue gases.

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CFD Modelling of CO2 Capture in a Packed Bed by Chemical Absorption

Cited by 41 publications

References 19 publications

Numerical analysis of CO2 capture efficiency in post combustion CCS technology in terms of varying flow conditions

Numerical analysis of CO2 capture efficiency in post combustion CCS technology in terms of varying flow conditions

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

Investigation of a combined gas-steam system with flue gas recirculation

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