Co-firing characteristics of rice husk and coal in a cyclonic fluidized-bed combustor (Ψ-FBC) under controlled bed temperatures

Journal article

Authors/Editors

SOMCHART SOPONRONNARIT

Strategic Research Themes

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Publication Details

Author list: Madhiyanon T., Sathitruangsak P., Soponronnarit S.

Publisher: Elsevier

Publication year: 2011

Journal: Fuel: The Science and Technology of Fuel and Energy (0016-2361)

Volume number: 90

Issue number: 6

Start page: 2103

End page: 2112

Number of pages: 10

ISSN: 0016-2361

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-79953833056&doi=10.1016%2fj.fuel.2011.02.019&partnerID=40&md5=fc1d66fca5ef5b494e7b765f61edbbf9

Languages: English-Great Britain (EN-GB)

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Abstract

This study extensively investigated temperature and emission characteristics, and the performance of co-firing rice husk with coal in a cyclonic fluidized-bed combustor (Ψ-FBC) of 125 kWth nominal capacity. The Ψ-FBC integrated the distinct features of cyclonic/vortex and fluidized-bed combustion. Fluidization, without any inert material, can be accomplished by the stirring blades and vortex ring. The combustor was equipped with a multi-passes water coil to regulate the bed temperatures, varying 800-900 °C. Rice husk was co-fired with coal, a supplementary fuel, with coal blending ratios of 0-25% by thermal basis. The radial temperature profiles displayed vortex combustion along the wall, while the axial temperature profiles suggested a well-mixed condition in the lower part. The large depletion of O2 and proliferation of CO in the lower part revealed vigorous combustion beneath the vortex ring. A reducing atmosphere appeared unfavorable to NOx formation. The combustor showed satisfied Ec, mostly >98.5%. The optimum operating conditions with respect to NO x emissions were: (1) the thermal percentage of coal not >20%, and (2) bed temperatures between 800 and 850 °C. Otherwise, NOx emissions would exceed the regulations; even CO and SO2 emissions were well acceptable. © 2011 Elsevier Ltd. All rights reserved.

Keywords

Biomass, Coal, Co-combustion, Fluidized bed, Vortex