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Layer formation mechanism of K-feldspar in bubbling fluidized bed combustion of phosphorus-lean and phosphorus-rich residual biomass
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics. Bioenergy 2020+ GmbH, Vienna, Austria; Institute of Chemical, Environmental & Bioscience Engineering, Technische Universität Wien, Vienna, Austria. (Thermochemical Energy Conversion Laboratory)ORCID iD: 0000-0002-5777-9241
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2019 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 248, p. 545-554Article in journal (Refereed) Published
Abstract [en]

The use of phosphorus-rich fuels in fluidized bed combustion is one probable way to support both heat and power production and phosphorus recovery. Ash is accumulated in the bed during combustion and interacts with the bed material to form layers and/or agglomerates, possibly removing phosphorus from the bed ash fraction. To further deepen the knowledge about the difference in the mechanisms behind the ash chemistry of phosphorus -lean and phosphorus-rich fuels, experiments in a 5 kW bench-scale-fluidized bed test-rig with K-feldspar as the bed material were conducted with bark, wheat straw, chicken manure, and chicken manure admixtures to bark and straw. Bed material samples were collected and studied for layer formation and agglomeration phenomena by scanning electron microscopy combined with energy dispersive X-ray spectrometry. The admixture of phosphorus-rich chicken manure to bark changed the layer formation mechanism, shifting the chemistry to the formation of phosphates rather than silicates. The admixture of chicken manure to straw reduced the ash melting and agglomeration risk, making it possible to increase the time until defluidization of the fluidized bed occurred. The results also highlight that an increased ash content does not necessarily lead to more ash melting related problems if the ash melting temperature is high enough.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 248, p. 545-554
Keywords [en]
Phosphorus, Layer formation, Agglomeration, K-feldspar, Fluidized bed
National Category
Energy Engineering Inorganic Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-160593DOI: 10.1016/j.apenergy.2019.04.112ISI: 000469891900044Scopus ID: 2-s2.0-85064643200OAI: oai:DiVA.org:umu-160593DiVA, id: diva2:1329254
Projects
Bio4Energy
Funder
The Kempe FoundationsAvailable from: 2019-06-24 Created: 2019-06-24 Last updated: 2019-09-02Bibliographically approved

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Skoglund, NilsKuba, Matthias

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