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A simple expression for the apparent reaction rate of large wood char gasification with steam
KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
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2010 (Engelska)Ingår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 101, nr 11, s. 4187-4192Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A simple expression for the apparent reaction rate of large wood char gasification with steam is proposed. Large char samples were gasified under steam atmosphere using a thermo-balance reactor. The apparent reaction rate was expressed as the product of the intrinsic rate and the effective factor. The effective factor was modified to include the effect of change in char diameter and intrinsic reaction rate during the reaction. Assuming uniform conversion ratio throughout a particle, the simplified reaction scheme was divided into three stages. In the initial stage, the local conversion ratio increases without particle shrinkage. In the middle stage, the particle shrinks following the shrinking core model without change in the local conversion ratio. In the final stage, the local conversion ratio increases without particle shrinkage. The validity of the modified effective value was confirmed by comparison with experimental results. (C) 2010 Elsevier Ltd. All rights reserved.

Ort, förlag, år, upplaga, sidor
2010. Vol. 101, nr 11, s. 4187-4192
Nyckelord [en]
Biomass gasification, Char gasification with steam, Apparent reaction rate, Effective factor
Nationell ämneskategori
Jordbruksvetenskap Industriell bioteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-28415DOI: 10.1016/j.biortech.2010.01.051ISI: 000275999800056OAI: oai:DiVA.org:kth-28415DiVA, id: diva2:388753
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QC 20110118Tillgänglig från: 2011-01-18 Skapad: 2011-01-14 Senast uppdaterad: 2017-12-11Bibliografiskt granskad

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Umeki, Kentaro
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Materialvetenskap
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Bioresource Technology
JordbruksvetenskapIndustriell bioteknik

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