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Layer Formation on Feldspar Bed Particles during Indirect Gasification of Wood. 1. K-Feldspar
Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden.ORCID iD: 0000-0001-5614-3578
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-0488-438x
Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Gothenburg, Sweden.ORCID iD: 0000-0001-8403-6868
Bioenergy2020+ GmbH, Güssing, 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. 7321-7332Article in journal (Refereed) Published
Abstract [en]

The choice of bed material for biomass gasification plays a crucial role for the overall efficiency of the process. Olivine is the material conventionally used for biomass gasification due to the observed activity of olivine toward cracking of unwanted tars. Despite its catalytic activity, olivine contains high levels of chromium, which complicates the deposition of used bed material. Feldspar has shown the same activity as olivine when used as a bed material in biomass gasification. As opposed to olivine, feldspar does not contain environmentally hazardous compounds, which makes it a preferred alternative for further applications. The interaction of bed material and ash heavily influences the properties of the bed material. In the present study interactions between feldspar and main ash compounds of woody biomass in an indirect gasification system were investigated. Bed material samples were collected at different time intervals and analyzed with SEM-EDS and XRD. The obtained analysis results were then compared to thermodynamic models. The performed study was divided in two parts: in part 1 (the present paper), K-rich feldspar was investigated, whereas Na-rich feldspar is presented in part 2 of the study (DOI: 10.1021/acs.energyfuels.9b01291). From the material analysis performed, it can be seen that, as a result of the bed materials’ interactions with the formed ash compounds, the latter were first deposited on the surface of the K-feldspar particles and later resulted in the formation of Ca- and Mg-rich layers. The Ca enriched in the layers further reacted with the feldspar, which led to its diffusion into the particles and the formation of CaSiO3 and KAlSiO4. Contrary to Ca, Mg did not react with the feldspar and remained on the surface of the particles, where it was found as Mg- or Ca-Mg-silicates. As a result of the described interactions, layer separation was noted after 51 h with an outer Mg-rich layer and an inner Ca-rich layer. Due to the development of the Ca- and Mg-rich layers and the bed material–ash interactions, crack formation was observed on the particles’ surfaces.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 33, no 8, p. 7321-7332
Keywords [en]
Dual Fluidized Bed, Bed Material, Wood, Feldspar
National Category
Chemical Process Engineering Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-75491DOI: 10.1021/acs.energyfuels.9b01291ISI: 000481569100046OAI: oai:DiVA.org:ltu-75491DiVA, id: diva2:1342274
Funder
Swedish Energy Agency, P46533-1 and P42034-1
Note

Validerad;2019;Nivå 2;2019-09-09 (johcin)

Available from: 2019-08-13 Created: 2019-08-13 Last updated: 2019-09-09Bibliographically approved

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Hannl, Thomas KarlKuba, MatthiasÖhman, Marcus

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