Improved rate-based modeling of carbon dioxide absorption with aqueous monoethanolamine solution

doi:10.1007/s11705-014-1415-0

Front. Chem. Sci. Eng.

2014, Vol. 8

Issue (1) : 123-131 https://doi.org/10.1007/s11705-014-1415-0

RESEARCH ARTICLE

Improved rate-based modeling of carbon dioxide absorption with aqueous monoethanolamine solution

Stefania MOIOLI¹, Laura A. PELLEGRINI¹(

), Simone GAMBA¹, Ben LI²

¹. Department of Chemistry, Materials and Chemical Engineering “G. Natta”, I-20133 Milano, Italy
². School of Chemical Engineering, University of Science and Technology, Anshan 114051, China

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Abstract

This paper focuses on modeling and simulation of a post-combustion carbon dioxide capture in a coal-fired power plant by chemical absorption using monoethanolamine. The aim is to obtain a reliable tool for process simulation: a customized rate-based model has been developed and implemented in the ASPEN Plus^® software, along with regressed parameters for the Electrolyte-NRTL model worked out in a previous research. The model is validated by comparison with experimental data of a pilot plant and can provide simulation results very close to experimental data.

Keywords Absorption carbon dioxide capture rate-based model monoethanolamine scrubbing

Corresponding Author(s): Laura A. PELLEGRINI

Issue Date: 05 March 2014

Cite this article:

Stefania MOIOLI,Laura A. PELLEGRINI,Simone GAMBA, et al. Improved rate-based modeling of carbon dioxide absorption with aqueous monoethanolamine solution[J]. Front. Chem. Sci. Eng., 2014, 8(1): 123-131.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-014-1415-0
https://academic.hep.com.cn/fcse/EN/Y2014/V8/I1/123

Test (Dugas, 2006)	Experimental data	ASPEN Plus^® default		Eq. (19)		Our model
Test (Dugas, 2006)	$y C O 2$ OUT	$y C O 2$ OUT	% Absolute error	$y C O 2$ OUT	% Absolute error	$y C O 2$ OUT	% Absolute error
29	0.0532	0.04619	13.18	0.01704	67.97	0.05156	3.08
30	0.0591	0.05022	15.03	0.02381	59.71	0.05558	5.96
43	0.0558	0.04698	15.81	0.03328	40.36	0.05238	6.13
44	0.054	0.04655	13.80	0.03252	39.78	0.05203	3.65
47	0.0638	0.06682	4.73	0.06312	1.07	0.06753	5.85
48	0.0619	0.06339	2.41	0.05893	4.80	0.06374	2.97
		AAD /%		AAD /%		AAD /%
		10.82		35.61		4.61

Tab.1 CO₂ mole fraction in the purified gas

Tab.2 Experimental data of the streams entering the absorption column for different cases

Fig.1 Experimental data [39] and temperature profile along the absorption column for the case # 44 reported in Table 2

Fig.2 Experimental data [39] and temperature profile along the absorption column for the case # 47 reported in Table 2

Fig.3 Molar flow profile of carbon dioxide in the vapor phase along the absorption column for the case # 44 reported in Table 2

Fig.4 Molar flow profile of carbon dioxide in the vapor phase along the absorption column for the case # 47 reported in Table 2

[ ]	Concentration, kmol/m³
a	Activity
$D CO 2$	Diffusivity of carbon dioxide in the solvent, m²/s
E	Eddy diffusivity, m²/s
F	Molar flow, kmol/h
$k$	Kinetic constant, m³/(kmol·s)
$k l °$	Mass transfer coefficient of liquid film, m/s
$K a, CO 2$	Equilibrium constant for the hydrolysis of dissolved carbon dioxide
$K a, HCO 3 −$	Equilibrium constant for the dissociation of bicarbonate ion
$K a, MEAH +$	Equilibrium constant for the dissociation of protonated MEA
$K carb$	Equilibrium constant for the dissociation of carbammate
$K H 2 O$	Equilibrium constant for the dissociation of water
$N CO 2$	Flux of carbon dioxide, kmol/(m²·s)
P	Pressure, bar
R	Rate of reaction, kmol/(m³·s), or universal gas constant in Eq. (13) and in Eq. (14)
T	Temperature, K
x	Distance from the interface

Nomenclature

ε	ε coefficient for Eddy diffusivity
$γ CO 2$	Activity coefficient of carbon dioxide
δ	δ film thickness, m

Greek letters

Superscripts

Subscripts

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