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The Characterization of Wood Species from Mozambique as a Fuel
Swedish University for Agricultural Sciences (SLU), Department of Energy and Technology, Uppsala, Sweden ..
2014 (English)In: Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, ISSN 1556-7036, E-ISSN 1556-7230, Vol. 36, no 8, 851-857 p.Article in journal (Refereed) Published
Abstract [en]

The efficient utilization of fuelwood as a source of energy is strongly dependent on the properties of the biomass. This study characterizes common hardwood species from Mozambique and evaluates their quality as a fuel. Disc samples, taken at breast height, from Afzelia quanzensis Welwn, Millettia stuhlmannii Taub, Pterocarpus angolensis DC, Sterculia appendiculata K. Schum, Pericopsis angolensis Meeuwen, Acacia nigrescens Oliv., Pseudolachostylis maprounaefolia Pax, and Icuria dunensis Wieringa, were collected from three provinces in Mozambique. Chemical and physical properties were analyzed. The raking of the species as fuel was performed using fuelwood value index. The higher heating value varied between 19.38 and 21.50 MJ/kg dry weight. The concentration of lignin ranged from 21.96 up to 36.69% weight dry basis (wt% d.b.), and ash free. All studied species showed very low concentrations of Si, S, and Cl. Ash content varied between 0.76-3.71 wt% (d.b.), while the basic density ranged from 536 to 1,111 k gm(-3). Heavy metals were also determined and their concentrations were below the values reported in the literature. The species Acacia nigrescens had the highest fuelwood value index and it was closely followed by Icuria dunensis and Millettia stuhlmannii. The worst ranked was Sterculia appendiculata.

Place, publisher, year, edition, pages
2014. Vol. 36, no 8, 851-857 p.
Keyword [en]
mineral content, calorific value, lignin, fuelwood value index, ash content, wood fuel, hardwood
National Category
Energy Engineering Environmental Sciences
Identifiers
URN: urn:nbn:se:kth:diva-159481DOI: 10.1080/15567036.2011.582601ISI: 000331601300006Scopus ID: 2-s2.0-84894590809OAI: oai:DiVA.org:kth-159481DiVA: diva2:785115
Funder
Sida - Swedish International Development Cooperation Agency
Note

QC 20150202

Available from: 2015-02-02 Created: 2015-02-02 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Mild Wet Torrefaction and Characterization of Woody Biomass from Mozambique for Thermal Applications
Open this publication in new window or tab >>Mild Wet Torrefaction and Characterization of Woody Biomass from Mozambique for Thermal Applications
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Mozambique has vast forestry resources and also considerable biomass waste material such as bagasse, rice husks, sawdust, coconut husks and shells, cashew nut shell and lump charcoal waste. The potential of the total residues from the agricultural sector and the forest industry is estimated to be approximately 13 PJ. This amount of energy covers totally the production of charcoal which amounted to approximately 12.7 PJ in 2006. Although biomass is an attractive renewable source of energy, it is generally difficult to handle, transport, storage and use due to its lower homogeneity, its lower energy density and the presence of non-combustible inorganic constituents, which leads to different problems in energy conversion units such as deposition, sintering, agglomeration, fouling and corrosion. Therefore, a pretreatment of the biomass to solve these problems could lead to a change of current biomass utilization situation. The aim of this study is to convert Mozambican woody biomass residue into a solid biochar that resembles low-grade coal.

In this work the current energy situation in Mozambique has been reviewed, and the available and potential renewable sources including residues from agricultural crops and forest industry as energy have been assessed. It was found that the country is endowed with great potential for biofuel, solar, hydro and wind energy production. However, the production today is still far from fulfilling the energy needs of the country, and the majority of people are still not benefiting from these resources. Charcoal and firewood are still the main sources of energy and will continue to play a very important role in the near future. Additionally, enormous amounts of energy resources are wasted, especially in the agricultural sector. These residues are not visible on national energy statistics. The chemical composition and the fuelwood value index (FVI) showed that by failing to efficiently utilise residues from Afzelia quanzensis, Millettia stuhlmannii and Pterocarpus angolensis, an opportunity to reduce some of the energy related problems is missed. An evaluation of effect of a mild wet torrefaction pretreatment showed that the chemical composition of the biochar is substantially different than the feedstock. The use of diluted acid as catalysts improves the biochar quality, namely in terms of the energy density and ash characteristics; however, the increment of the S content in the final product should be considered for market acceptance (because the fuels have a maximum allowance for S concentration). The thermal behaviour of the untreated and treated biomass was also investigated. The pyrolytic products of umbila and spruce were affected by the treatment and catalyst in terms of yield and composition of the vapours.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. v, 71 p.
Keyword
Biomass, Wet torrefaction, Fast Pyrolysis, kinetics, Catalyst
National Category
Engineering and Technology Chemical Process Engineering
Identifiers
urn:nbn:se:kth:diva-159476 (URN)978-91-7595-429-5 (ISBN)
Public defence
2015-02-20, Sal F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20150202

Available from: 2015-02-02 Created: 2015-02-02 Last updated: 2015-02-02Bibliographically approved

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