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Deposit build-up and ash behavior in dual fluid bed steam gasification of logging residues in an industrial power plant
Umeå University, Faculty of Science and Technology, Department of Applied Physics and Electronics.
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2015 (English)In: Fuel processing technology, ISSN 0378-3820, E-ISSN 1873-7188, Vol. 139, 33-41 p.Article in journal (Refereed) Published
Abstract [en]

A promising way to substitute fossil fuels for production of electricity, heat, fuels for transportation and synthetic chemicals is biomass steam gasification in a dual fluidized bed (DFB). Using lower-cost feedstock, such as logging residues, instead of stemwood, improves the economic operation. In Senden, near Ulm in Germany, the first plant using logging residues is successfully operated by Stadtwerke Ulm. The major difficulties are slagging and deposit build-up. This paper characterizes inorganic components of ash forming matter and draws conclusions regarding mechanisms of deposit build-up. Olivine is used as bed material. Impurities, e.g., quartz, brought into the fluidized bed with the feedstock play a critical role. Interaction with biomass ash leads to formation of potassium silicates, decreasing the melting temperature. Recirculation of coarse ash back into combustion leads to enrichment of critical fragments. Improving the management of inorganic streams and controlling temperature levels is essential for operation with logging residues. (C) 2015 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2015. Vol. 139, 33-41 p.
Keyword [en]
Biomass gasification, Deposit build-up, Olivine, Bed material agglomeration, Logging residues
National Category
Other Earth and Related Environmental Sciences
URN: urn:nbn:se:umu:diva-110984DOI: 10.1016/j.fuproc.2015.08.017ISI: 000362619200005OAI: diva2:872295
Available from: 2015-11-18 Created: 2015-11-02 Last updated: 2015-11-18Bibliographically approved

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Boström, Dan
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