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The fate of trace elements in fluidised bed combustion of sewage sludge and wood
University of Borås, School of Engineering.
University of Borås, School of Engineering.
2006 (English)In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 86, no 5-6, p. 843-852Article in journal (Refereed) Published
Abstract [en]

Combustion tests have been carried out in a fluidised bed boiler to investigate the fate of trace elements during co-combustion of wood and municipal sewage sludge. The approach was to collect fuel and ash samples and to perform thermodynamic equilibrium calculations for gasification (reducing) and combustion (oxidising) conditions. Trace elements are found in the ash. Even most of the highly volatile Hg is captured in the bag filter ash. The bag filter ash offers higher surface area than the secondary cyclone ash and enhances the capture of Hg. There is no obvious correlation between capture and parameters investigated (sludge precipitation agent and lime addition). As, Cd, Hg, Pb, Se, Sb and Tl are predicted by equilibrium calculations to be volatile in the combustion chamber under oxidising conditions and Hg even at the filter temperature (150°C). Reducing conditions promote, in some case more than others, the volatility of As, Cd, Pb, Sb, Se, Tl and Zn. The opposite effect was observed for Cu and Ni. Data points to the necessity of including bag-filter in the gas cleaning system in order to achieve good removal of toxic trace elements.

Place, publisher, year, edition, pages
Elsevier , 2006. Vol. 86, no 5-6, p. 843-852
Keywords [en]
co-combustion, sewage sludge, trace element
Keywords [sv]
Energi och material
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:hb:diva-2283DOI: 10.1016/j.fuel.2006.08.014Local ID: 2320/2918OAI: oai:DiVA.org:hb-2283DiVA, id: diva2:870373
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2017-11-27Bibliographically approved

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Elled, Anna-LenaAndersson, Bengt-Åke

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