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Dynamics of furnace process in a CFB boiler
University of Borås, School of Engineering.
2007 (English)In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 62, no 1-2, p. 550-560Article in journal (Refereed) Published
Abstract [en]

With the aim of understanding the dynamics of combustion, this work examines simultaneous fluctuations in fluid dynamic parameters and gas composition measured in a CFB furnace operated with coal as a fuel. The fluid dynamic parameters investigated are pressure and air flow entering the furnace. Gas composition was recorded by a zirconia-cell probe and a gas suction probe connected to a mass spectrometer having a high time resolution (10 Hz). The principal fluctuations detected are around I Hz and below 0.3 Hz. The fluctuations below 0.3 Hz mostly originate from variations in the fuel-feed rate. These variations create periods of reducing conditions caused by a momentarily high fuel input accompanied by a pressure rise in the furnace and a reduction of the air feed, which occurs concurrent with the release of an enhanced quantity of volatiles. Modelled pressure fluctuations based on the relation between volatile release and pressure in the furnace give similar pressure fluctuations as the measured pressure fluctuations, with respect to amplitude and characteristic time scale of the fluctuations. There is also a correlation between reducing conditions and the concentration of hydrocarbons. (c) 2006 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
Elsevier , 2007. Vol. 62, no 1-2, p. 550-560
Keywords [en]
circulating fluidised bed, combustion, gas composition, dynamics, hydrodynamics, fluidisation, fluidised bed
Keywords [sv]
Energi och material
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:hb:diva-2279DOI: 10.1016/j.ces.2006.09.020Local ID: 2320/2913OAI: oai:DiVA.org:hb-2279DiVA, id: diva2:870369
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2017-12-03Bibliographically approved

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Johansson, Andreas

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