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Investigating the morphology and reactivity of chars from Triplochiton scleroxylon pyrolysed under varied conditionsInvestigating the morphology and reactivity of chars from Triplochiton scleroxylon pyrolysed under varied conditions
University of Borås, Faculty of Textiles, Engineering and Business. Lagos State University. (Resource Recovery)ORCID iD: 0000-0002-7351-9677
2016 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 208, no 0, 94-99 p.Article in journal (Refereed) Published
Sustainable development
The content falls within the scope of Sustainable Development
Abstract [en]

A gasifier may be optimised via a good understanding of the char formation, morphology and reactivity. The effects of varying the pyrolysis pressure and heating rate on the morphology of the char were investigated using a thermogravimetric analyser (TGA), scanning electron microscope (SEM) and micrograph spot analyser. The gasified chars were produced at heating rates of 5, 10 and 20 C/min and pressures of 0.1, 0.4 and 0.6 MPa. All the chars have different degrees of apparent gasification reactivity. The random pore model (RPM) provided a better description of the experiment, with low average error values, h, in all of the cases considered. The alkaline and alkaline earth metals (AAEM) in the tropical wood biomass Arere (Triplochiton scleroxylon) consist predominantly of calcium and could altogether be partly responsible for the noticeably high reactivity nature of the tropical Arere chars

Place, publisher, year, edition, pages
Bioresource Technology: Elsevier, 2016. Vol. 208, no 0, 94-99 p.
Keyword [en]
pyrolysis; tropical biomass; char morphology; calcium crystals; gasification kinetics
National Category
Chemical Engineering
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-9325DOI: 10.1016/j.biortech.2016.02.061OAI: oai:DiVA.org:hb-9325DiVA: diva2:909957
Available from: 2016-03-07 Created: 2016-03-07 Last updated: 2016-04-07Bibliographically approved
In thesis
1. Investigating the Reaction Kinetics of Tropical Wood Biomass: A Prospect for Energy Recovery
Open this publication in new window or tab >>Investigating the Reaction Kinetics of Tropical Wood Biomass: A Prospect for Energy Recovery
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The utilization of wood biomass for energy recovery purposes is a phenomenon that is increasingly attracting attentions from researchers, companies and countries all over the world. The effect of climate change as largely represented by global warming leading to glacier ice melting and an unprecedented rise in sea level is a worrisome development. One of the causal agents of this scenario is the increase in world’s greenhouse gas emission. A sure method of approach to ending the problem is to drastically reduce the emission level to the barest minimum, or to zero level if possible. Wood biomass conversion via thermal treatment is an activity capable of reducing the emission possibility as the CO2 released during the conversion is effectively taken care of. Another benefit derivable from the conversion is taking care of what otherwise would have been termed a waste and treated as such. The envisaged use of wood resource to solve the lingering power problem in Nigeria is an effort in the right direction.

The thesis highlights the conversion processes, as well as the reaction kinetics involved. Reaction parameters such as temperature, heating rate, partial pressure, and flow rate were investigated for the purpose of identifying their effect on the conversion processes. The typical kinetic parameters obtained during the conversion processes would be of high importance in the design and configuration of reactors meant for the optimum conversion of wood waste biomass as a valuable resource. With the non-tropical wood biomass already deployed for energy conversion in the developed countries, the similarity in the trend as regards conversion reactions (char formation and

conversions, kinetic parameters) compared to the tropical counterpart is a welcome development. This suggests the candidacy of non-tropical wood biomass for energy recovery purposes as a viable one.

Place, publisher, year, edition, pages
Borås: Högskolan i Borås, 2016. 70 p.
Series
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 77
Keyword
Wood, Pyrolysis, gasification, char, kinetic parameters, SEM-EDX, AAEM
National Category
Engineering and Technology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-9334 (URN)978-91-88269-10-2 (ISBN)978-91-88269-11-9 (ISBN)
Public defence
2016-04-29, in room E310,, University of Borås, Allegatan 1, Borås, Sweden, Borås, 10:00 (English)
Available from: 2016-04-07 Created: 2016-03-08 Last updated: 2016-04-07Bibliographically approved

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Publisher's full texthttp://www.sciencedirect.com/science/article/pii/S0960852416301985

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