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Layer Formation on Feldspar Bed Particles during Indirect Gasification of Wood. 2. Na-Feldspar
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. Energy Engineering, Division of Energy Science, Luleå University of Technology, SE-97187 Lulea, Sweden; Bioenergy2020+ GmbH, Wiener Straße 49, A-7540 Güssing, Austria; Institute of Chemical, Environmental & Bioscience Engineering, TU Vienna, A-1060 Vienna, Austria.ORCID iD: 0000-0003-3863-5186
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2019 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 33, no 8, p. 7333-7346Article in journal (Refereed) Published
Abstract [en]

Selecting a suitable bed material for the thermochemical conversion of a specific feedstock in a fluidized bed system requires identification of the characteristics of potential bed materials. An essential part of these characteristics is the interaction of the bed material with feedstock ash in a fluidized bed, which leads to layer formation and morphology changes. For this purpose, the interaction of feldspar bed material with the main ash-forming elements in wood ash (Ca, K, Mg, Si) in an indirect gasification system was analyzed using SEM-EDS, XRD, and thermodynamic modeling. In part 1 of this work (DOI: 10.1021/acs.energyfuels.9b01291), the layer formation on K-feldspar dominated by Ca reaction and ash deposition was investigated. The aim of this second part of the work was to determine the time-dependent layer formation on Na-feldspar and compare the results with the findings for K-feldspar. Interaction of Na-feldspar with ash-derived elements resulted in different layers on Na-feldspar: K reaction layers, where K replaced Na and Si shares decreased; Ca reaction layers, where Ca enriched and reacted with the Na-feldspar; and ash deposition layers, where wood ash elements accumulated on the surface. Ca reaction layers were formed first and became continuous on the surface before K reaction layers and ash deposition layers were detected. Cracks and crack layer formation in the Na-feldspar particles were found after several days of operation. The layer compositions and growth rates indicate that the diffusion of Ca and K plays an essential role in the formation of Ca reaction and K reaction layers. The reaction with Ca and the crack formation coincide with the interaction previously found for quartz and K-feldspar. In contrast to K-feldspar, Na-feldspar showed high potential for reaction with K. The findings indicate that the reaction of Nafeldspar with ash-derived K makes Na-feldspar a less stable bed material than K-feldspar during the thermochemical conversion of K-rich feedstocks in a fluidized bed system.

Place, publisher, year, edition, pages
2019. Vol. 33, no 8, p. 7333-7346
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-163084DOI: 10.1021/acs.energyfuels.9b01292ISI: 000481569100047OAI: oai:DiVA.org:umu-163084DiVA, id: diva2:1351016
Funder
Swedish Energy Agency, P46533-1Swedish Energy Agency, P42034-1Available from: 2019-09-13 Created: 2019-09-13 Last updated: 2019-09-13Bibliographically approved

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Kuba, Matthias

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