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Thermal stability of bed particle layers on naturally occurring minerals from dual fluid bed gasification of woody biomass
TU Wien, Institute of Chemical Engineering.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. (Energy Engineering)
Bioenergy 2020+.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. (Energy Engineering)
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Number of Authors: 7
2016 (English)In: Energy & Fuels, ISSN 0887-0624, E-ISSN 1520-5029, Vol. 30, no 10, 8277-8285 p.Article in journal (Refereed) Published
Abstract [en]

The use of biomass as feedstock for gasification is a promising way of producing not only electricity and heat but also fuels for transportation and synthetic chemicals. Dual fluid bed steam gasification has proven to be suitable for this purpose. Olivine is currently the most commonly used bed material in this process due to its good agglomeration performance and its catalytic effectiveness in the reduction of biomass tars. However, as olivine contains heavy metals such as nickel and chromium, no further usage of the nutrient-rich ash is possible, and additional operational costs arise due to necessary disposal of the ash fractions. This paper investigates possible alternative bed materials and their suitability for dual fluid bed gasification systems focusing on the behavior of the naturally occurring minerals olivine, quartz, and K-feldspar in terms of agglomeration and fracturing at typical temperatures. To this end, samples of bed materials with layer formation on their particles were collected at the industrial biomass combined heat and power (CHP) plant in Senden, Germany, which uses olivine as the bed material and woody biomass as feedstock. The low cost logging residue feedstock contains mineral impurities such as quartz and K-feldspar, which become mixed into the fluidized bed during operation. Using experimental and thermochemical analysis, it was found that the layers on olivine and K-feldspar showed a significantly lower agglomeration tendency than quartz. Significant fracturing of particles or their layers could be detected for olivine and quartz, whereas K-feldspar layers were characterized by a higher stability. High catalytic activity is predicted for all three minerals once Ca-rich particle layers are fully developed. However, quartz may be less active during the buildup of the layers due to lower amounts of Ca in the initial layer formation

Place, publisher, year, edition, pages
2016. Vol. 30, no 10, 8277-8285 p.
National Category
Chemical Process Engineering Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-59488DOI: 10.1021/acs.energyfuels.6b01523ISI: 000386107200055ScopusID: 2-s2.0-84992431095OAI: oai:DiVA.org:ltu-59488DiVA: diva2:1032878
Note

Validerad; 2016; Nivå 2; 2016-11-09 (andbra)

Available from: 2016-10-04 Created: 2016-10-04 Last updated: 2016-11-20Bibliographically approved

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