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Alkali interactions with a calcium manganite oxygen carrier used in chemical looping combustion
University of Gothenburg, Sweden.
Chalmers University of Technology, Sweden.ORCID iD: 0000-0003-2454-3870
University of Gothenburg, Sweden.
Chalmers University of Technology, Sweden.
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2022 (English)In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 227Article in journal (Refereed) Published
Abstract [en]

Chemical-Looping Combustion (CLC) of biofuels is a promising technology for cost-efficient CO2 separation and can lead to negative CO2 emissions when combined with carbon capture and storage. A potential challenge in developing CLC technology is the effects of alkali metal-containing compounds released during fuel conversion. This study investigates the interactions between alkali and an oxygen carrier (OC), CaMn0.775Ti0.125Mg0.1O3-δ, to better understand the fate of alkali in CLC. A laboratory-scale fluidized bed reactor is operated at 800–900 °C in oxidizing, reducing and inert atmospheres to mimic CLC conditions. Alkali is fed to the reactor as aerosol KCl particles, and alkali in the exhaust is measured online with a surface ionization detector. The alkali concentration changes with gas environment, temperature, and alkali loading, and the concentration profile has excellent reproducibility over repeated redox cycles. Alkali-OC interactions are dominated by alkali uptake under most conditions, except for a release during OC reduction. Uptake is significant during stable reducing conditions, and is limited under oxidizing conditions. The total uptake during a redox cycle is favored by a high alkali loading, while the influence of temperature is weak. The implications for the understanding of alkali behavior in CLC and further development are discussed. 

Place, publisher, year, edition, pages
Elsevier B.V. , 2022. Vol. 227
Keywords [en]
Biofuels; Calcium; Carbon capture; Carbon dioxide; Chemical reactors; Chlorine compounds; Fluidized bed combustion; Fluidized beds; Ionization of gases; Oxygen; Potassium compounds; Redox reactions; Alkali; Alkali interaction; Chemical looping combustion; CO 2 emission; Cost-efficient; Ionization detectors; Oxygen Carrier; REDOX cycles; Surface ionization detector; Surface-ionization; Manganites
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:ri:diva-68757DOI: 10.1016/j.fuproc.2021.107099Scopus ID: 2-s2.0-85119487595OAI: oai:DiVA.org:ri-68757DiVA, id: diva2:1824094
Available from: 2024-01-04 Created: 2024-01-04 Last updated: 2024-01-04Bibliographically approved

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Soleimanisalim, Amir H

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