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Thermochemical equilibrium modeling of a biomass downdraft gasifier: Constrained and unconstrained non-stoichiometric models
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Technology.ORCID iD: 0000-0002-1664-0278
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2014 (English)In: Energy, ISSN 0360-5442, Vol. 71, 624-637 p.Article in journal (Refereed) Published
Abstract [en]

The objective of this work is to develop a non-stoichiometric equilibrium model to study parameter effects in the gasification process of a feedstock in downdraft gasifiers. The non-stoichiometric equilibrium model is also known as the Gibbs free energy minimization method. Four models were developed and tested. First a pure non-stoichiometric equilibrium model called M1 was developed; then the methane content was constrained by correlating experimental data and generating the model M2. A kinetic constraint that determines the apparent gasification rate was considered for model M3 and finally the two aforementioned constraints were implemented together in model M4. Models M2 and M4 showed to be the more accurate among the four developed models with mean RMS (root mean square error) values of 1.25 each. Also the gasification of Brazilian Pinus elliottii in a downdraft gasifier with air as gasification agent was studied. The input parameters considered were: (a) equivalence ratio (0.28-035); (b) moisture content (5-20%); (c) gasification time (30-120 min) and carbon conversion efficiency (80-100%).

Place, publisher, year, edition, pages
2014. Vol. 71, 624-637 p.
Keyword [en]
Gasification, Modeling, Non-stoichiometric, Constrained
National Category
Energy Engineering
URN: urn:nbn:se:kth:diva-148350DOI: 10.1016/ 000338388000056ScopusID: 2-s2.0-84902537673OAI: diva2:736189

QC 20140805

Available from: 2014-08-05 Created: 2014-08-05 Last updated: 2014-08-05Bibliographically approved

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Zanzi, Rolando
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Chemical Technology
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