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Systematic Studies of Ash Composition During the Co-Combustion of Rapeseed Cake and Bark
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics, Energy Technology and Thermal Process Chemistry.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics, Energy Technology and Thermal Process Chemistry.
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2012 (English)In: Proceedings of the 21st International Conference on Fluidized Bed Combustion, Naples, Italy, June 3-6, 2012, 2012, 219-226 p.Conference paper, Oral presentation only (Refereed)
Abstract [en]

Agglomeration occurring during the firing of phosphorus-rich biomass is not fully understood. It has become clear that the ash-forming matter in agricultural biomass (e.g., rapeseed cake) is phosphorus dominated and that phosphate species are involved in agglomeration. Understanding the agglomeration mechanisms would provide valuable insight into possible strategies for preventing defluidization. The objective of this work was to study the ash composition resulting from the combustion of a phosphorus-rich fuel, in particular, the phosphorus compounds formed; the focus was the effect of ash composition on the formation of sticky ash particles, which cause defluidization. Eleven mixtures of rapeseed cake and bark with varying Ca/P molar ratio were studied. Using a 5 kW quartz BFB reactor operated at approximately 800 °C, eight‐hour combustion tests were performed prior to each agglomeration experiment. Fly ash and bottom ash samples were extensively analyzed with SEM/EDX, and the fuel properties were also determined. Rapeseed cake ash consists of particles containing different K/Na-Ca/Mg-P compounds. The ash composition responsible for low defluidization temperatures was found to lie in the region of the ternary diagram containing 30-40 mol% P2O5, 20-40 mol% (CaO+MgO), and 30-50 mol% (K2O+Na2O). Sodium probably formed CaNaPO4, but it was also found in mixtures with other phosphates. The addition of bark favoured the formation of orthophosphates containing 40-50 mol% (CaO+MgO), which increased the first melting temperature of the ash.

Place, publisher, year, edition, pages
2012. 219-226 p.
Keyword [en]
rapeseed cake, bark, co-combustion, phosphorus, agglomeration
National Category
Natural Sciences Chemical Engineering
Identifiers
URN: urn:nbn:se:umu:diva-61471ISBN: 978-88-89677-83-4 (print)OAI: oai:DiVA.org:umu-61471DiVA: diva2:567996
Conference
21st International Conference on Fluidized Bed Combustion, Naples, Italy, June 3-6, 2012
Note

Presented by Nils Skoglund at the conference.

Available from: 2012-11-15 Created: 2012-11-15 Last updated: 2013-06-13Bibliographically approved

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