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Mechanism of Layer Formation on Olivine Bed Particles in Industrial-Scale Dual Fluid Bed Gasification of Wood
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2016 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 30, no 9, 7410-7418 p.Article in journal (Refereed) Published
Abstract [en]

Utilization of biomass as feedstock in dual fluidized bed steam gasification is a promising technology for the substitution of fossil energy carriers. Experience from industrial-scale power plants showed an alteration of the olivine bed material due to interaction with biomass ash components. This change results mainly in the formation of Ca-rich layers on the bed particles. In this paper, a mechanism for layer formation is proposed and compared to the better understood mechanism for layer formation on quartz bed particles. Olivine bed material was sampled at an industrial-scale power plant before the start of operation and at predefined times after the operation had commenced. Therefore, time-dependent layer formation under industrial-scale conditions could be investigated. The proposed mechanism suggests that the interaction between wood biomass ash and olivine bed particles is based on a solid solid substitution reaction, where Ca2+ is incorporated into the crystal structure. As a consequence, Fe2+/3+ and Mg2+ ions are expelled as oxides. This substitution results in the formation of cracks in the particle layer due to a volume expansion in the crystal structure once Ca2+ is incorporated. The results of this work are compared to relevant published results, including those related to quartz bed particles.

Place, publisher, year, edition, pages
2016. Vol. 30, no 9, 7410-7418 p.
National Category
Bioenergy
Identifiers
URN: urn:nbn:se:umu:diva-127976DOI: 10.1021/acs.energyfuels.6b01522ISI: 000383641000056OAI: oai:DiVA.org:umu-127976DiVA: diva2:1055662
Available from: 2016-12-13 Created: 2016-11-21 Last updated: 2016-12-13Bibliographically approved

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Boström, Dan
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Department of Applied Physics and Electronics
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Citation style
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