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Comparison of Mass Transfer Models on Rate-Based Simulations of CO2 Absorption and Desorption Processes
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0001-7328-1024
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-8034-4043
Royal Institute of Technology, Sweden.
Mälardalen University, School of Business, Society and Engineering, Future Energy Center.ORCID iD: 0000-0002-6279-4446
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2017 (English)In: Energy Procedia, ISSN 1876-6102, Vol. 142, p. 3747-3752Article in journal (Refereed) Published
Abstract [en]

One of the keys available options for the large scale carbon capture and storage is the solvent-based post-combustion capture. Due to the high reactivity between CO2 and aqueous amine solutions, chemical absorption is suitable for capturing the CO2 at low concentration such as from the flue gas. From techno-economic analyses of the CO2 chemical absorption plant, absorber and desorber columns are the main cost of the purchased equipment. Since the process involves complex reactive separations, the accurate calculation of hydrodynamic properties, mass and energy transfer are of importance for the design of the columns. Several studies have been done on the impact of different process and property models on the equilibrium and rate-based simulation of the absorption site. However, the impact study of process and property models on the desorption site are still lacking. This paper performs rate-based simulations of CO2 absorption by Monoethanolamine. The software Aspen Plus was used for the simulations. Different mass transfer models were implemented for the mass transfer calculation in gas and liquid phases. The temperature and concentration profiles along the columns are reported and discussed.

Place, publisher, year, edition, pages
2017. Vol. 142, p. 3747-3752
National Category
Engineering and Technology Chemical Process Engineering
Research subject
Biotechnology/Chemical Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-36234DOI: 10.1016/j.egypro.2017.12.271ISI: 000452901603140Scopus ID: 2-s2.0-85041529278OAI: oai:DiVA.org:mdh-36234DiVA, id: diva2:1131664
Conference
9th International Conference on Applied Energy, ICAE 2017; Cardiff; United Kingdom; 21 August 2017 through 24 August 2017
Available from: 2017-08-15 Created: 2017-08-15 Last updated: 2023-08-28Bibliographically approved
In thesis
1. Impacts of Thermo–Physical Properties on the Design, Operation, and Cost of Monoethanolamine–Based Chemical Absorption
Open this publication in new window or tab >>Impacts of Thermo–Physical Properties on the Design, Operation, and Cost of Monoethanolamine–Based Chemical Absorption
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The thermodynamic and transport properties of CO2 mixtures are essential to the design, operation, and optimization of all carbon capture and storage processes. To retrieve accurate property values, accurate property models are required. However, there are many properties, which are in turn affected by many factors. Moreover, property model development is behind the requirement of accurate properties. Therefore, it is important to quantify the property impacts on the process design for CCS to prioritize the development of models of the properties that are the most important ones.

According to the identified knowledge gaps, the impacts of the following thermo-physical properties were selected for quantitative analysis: density, viscosity, diffusivity, and surface tension on the column designs for the chemical absorption using aqueous monoethanolamine. The in–house rate–based absorption and desorption models were developed in MATLAB to simulate the processes, and sensitivity studies were done for each property. For the diameter design, developing more accurate gas phase density models should be prioritized. However, developing a more accurate liquid phase density model is also important, due to its significant impact and larger model uncertainty range. For the absorber packing height design, development of the liquid phase density and viscosity models should be prioritized. In addition, for the desorber packing height design, development of the gas phase diffusivity and density model should be prioritized. Regarding the impacts on the cost of the absorber and the overall equipment, development of the density and viscosity models of the aqueous amine solution with CO2 loading should be prioritized. However, as far as desorber cost is concerned, development of the gas phase density and diffusivity model of the CO2/H2O mixture should be prioritized.

The rate-based chemical absorption and desorption models were developed in Aspen Plus to evaluate the impacts of mass transfer coefficient models and desorber pressure. The liquid mass transfer coefficient has more significant impacts on the simulation of the absorber than it does to the simulation of the desorber. Moreover, the impacts on the concentration profiles are more significant compared to those on the temperature profiles. In addition, regenerating CO2 at elevated pressures shows the potential to reduce the energy penalty of CO2 capture and compression.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2020
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 317
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-49473 (URN)978-91-7485-474-9 (ISBN)
Public defence
2020-09-09, R2-205 (Online), Mälardalen University, Västerås, 10:00 (English)
Opponent
Supervisors
Available from: 2020-08-03 Created: 2020-07-24 Last updated: 2023-04-03Bibliographically approved

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Nookuea, WorradaZambrano, JesúsLi, HailongThorin, EvaYan, Jinyue

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