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Ultrafine ash particle formation during waste sludge incineration in fluidized bed reactors
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1998 (English)In: Combustion Science and Technology, ISSN 0010-2202, E-ISSN 1563-521X, Vol. 134, 433-455 p.Article in journal (Refereed)
Abstract [en]

Ash formation during the bubbling fluidized bed (BFB) combustion of bark and pulp mill sludge has been studied on an industrial and bench scale. During co-firing in an industrial BFB a submicron fly ash mode was formed via condensation of volatilized K, Na, S and Cl species at 0.05-0.3 μm. The submicron mass mode below 0.3 μm made up 2.2-5.0% of the fly ash, while the share of the supermicron mass fraction was 93.6-97.2%. Elements depleted in the ultrafine ash were Ca, Si, Al, Mg, Fe, Mn, P and Ti. The bench-scale test showed that the ultrafine particle concentration was increased by a higher bed temperature and decreased due to sludge moisture. As, Cd, Pb and Rb were enriched in the ultrafine ash on a bench scale, while Ba, Co, Sr and V were depleted. Cu and Zn were enriched in the ultrafine ash during the combustion of dried sludge, but not when wet sludge was fired. Micron-size ash particles composed of non-volatile species, Ca, Si, Mg, Al, P and Mn, adhered to the bed sand, presumably by surface forces, and sintering densified the ash layer. © 1998 OPA (Overseas Publishers Association) N.V. Published by license under the Gordon and Breach Science Publishers imprint.

Place, publisher, year, edition, pages
1998. Vol. 134, 433-455 p.
Keyword [en]
Ash, Combustion, Fluidized bed, Particulate emission, Sludge, Trace element
Keyword [sv]
Energiteknik
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:ri:diva-7003Scopus ID: 2-s2.0-12344296511OAI: oai:DiVA.org:ri-7003DiVA: diva2:964858
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2017-11-21Bibliographically approved

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