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Effect of the Mass Conversion Degree of an Oxygen Carrier on Char Conversion and Its Implication for Chemical Looping Gasification
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden.
Chalmers University of Technology, Sweden.ORCID-id: 0000-0003-2454-3870
Chalmers University of Technology, Sweden.
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2022 (Engelska)Ingår i: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 36, nr 17, s. 9768-9779Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Chemical looping gasification (CLG) is an emerging process that aims to produce valuable chemical feedstocks. The key operational requirement of CLG is to limit the oxygen transfer from the air reactor (AR) to the fuel reactor (FR). This can be accomplished by partially oxidizing the oxygen carrier in the AR, which may lead to a higher reduction degree of the oxygen carrier under the fuel conversion. A highly reduced oxygen carrier may experience multiple issues, such as agglomeration and defluidization. Given such an interest, this study examined how the variation of the mass conversion degree of ilmenite may affect the conversion of pine forest residue char in a fluidized bed batch reactor. Ilmenite was pre-reduced using diluted CO and then underwent the char conversion at 850, 900, 950, and 975 °C. Our investigations showed that the activation energy of the char conversion was between 194 and 256 kJ/mol, depending upon the mass conversion degree of ilmenite. Furthermore, the hydrogen partial pressure in the particle bed increased as the oxygen carrier mass conversion degree decreased, which was accompanied by a lower reaction rate and a higher reduction potential. Such a hydrogen inhibition effect was confirmed in the experiments; therefore, the change in the mass conversion degree indirectly affected the char conversion. Langmuir-Hinshelwood mechanism models used to evaluate the char conversion were validated. On the basis of the physical observation and characterizations, the use of ilmenite in CLG with biomass char as fuel will likely not suffer from major agglomeration or fluidization issues.

Ort, förlag, år, upplaga, sidor
American Chemical Society , 2022. Vol. 36, nr 17, s. 9768-9779
Nyckelord [en]
Activation energy; Agglomeration; Batch reactors; Fluidization; Fluidized beds; Fuels; Hydrogen; Ilmenite; Oxygen; Air reactors; Chemical feedstocks; Chemical looping; Fuel conversion; Fuel reactors; Operational requirements; Oxygen Carrier; Oxygen transfer; Reduction degree; Valuable chemicals; Gasification
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URN: urn:nbn:se:ri:diva-68758DOI: 10.1021/acs.energyfuels.2c00944Scopus ID: 2-s2.0-85133696554OAI: oai:DiVA.org:ri-68758DiVA, id: diva2:1824118
Tillgänglig från: 2024-01-04 Skapad: 2024-01-04 Senast uppdaterad: 2024-01-04Bibliografiskt granskad

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Soleimanisalim, Amir H

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