Characterization of Miombo species used by rural communities as fuelwood in Northern Mozambique

Assis, Maíra Reis de; Trugilho, Paulo Fernando

doi:10.1080/15567036.2020.1815910

Cited by 12 publications

(9 citation statements)

References 28 publications

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“…Bulk density of a fuel is important for domestic cooking or heating purposes. Denser fuels are more desired because they burn for longer times, therefore reducing the amount of fuel used for domestic cooking or heating purposes [68,69].…”

Section: Bulk Density Resultsmentioning

confidence: 99%

Thermal and mechanical characteristics of local firewood species and resulting charcoal produced by slow pyrolysis

Lubwama

Yiga

Ssempijja

et al. 2021

Biomass Conv. Bioref.

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The main source of fuel for domestic cooking applications in Sub-Saharan Africa is either locally available firewood species or charcoal produced by slow pyrolysis of these species. However, very few studies exist that characterize and quantify physical properties, burning rates, peak temperatures, and calorific values of typical firewood species and resulting charcoal fuels produced by slow pyrolysis. This study evaluated the mechanical and thermal properties of firewood and charcoal from five tree species namely: Dichrostachys cinerea, Morus Lactea, Piliostigma thonningii, Combretum molle, and Albizia grandibracteata. Characterization was done by scanning electron microscopy, thermogravimetric analysis, bomb calorimetry, Fourier transform infrared spectroscopy, bulk density measurements, and durability, water boiling and absorption tests. SEM images showed the development of macropores on charcoal after slow pyrolysis. Peak temperatures during firewood and charcoal combustion ranged between 515.5–621.8 °C and 741.6–785.9 °C, respectively. Maximum flame temperatures ranged between 786.9–870.8 °C for firewood and 634.4–737.3 °C for charcoal. Bulk densities and calorific values of charcoal species were higher than those for firewood species. Drop strengths for firewood were all 100% while for charcoal were between 93.7 and 100%. Water boiling tests indicated that firewood fuel performed better that charcoal fuel for low amounts of water due to higher maximum flame temperatures obtained during combustion of firewood.

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Section: Bulk Density Resultsmentioning

confidence: 99%

Thermal and mechanical characteristics of local firewood species and resulting charcoal produced by slow pyrolysis

Lubwama

Yiga

Ssempijja

et al. 2021

Biomass Conv. Bioref.

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“…The fuel value index (FVI) of the rice husks was calculated according to Eq. 3 (Massuque et al 2020).…”

Section: Energetic Characterizationmentioning

confidence: 99%

“…Meanwhile, K98 rice husks yielded 995.0 MJ/m 3 and 920.5 MJ/m 3 energetic densities for raw and modified husks respectively. Raw rice husks with higher energetic densities provide a greater amount of heat per unit volume than modified rice husks (Massuque et al 2020). Low energetic densities in modified rice husks are because Mg(OH) 2 is a flame retardant that acts by releasing water vapor through endothermic decomposition of fiber-reinforced polymer composites, leaving a thermally stable inorganic residue (Yiga et al 2021a).…”

Section: Energetic Propertiesmentioning

confidence: 99%

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Characterization of Rice Husks as Potential Reinforcement for Polymer Composites

2021

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Plastic consumption has continued to grow over the years. Meanwhile, conventional petroleum-based plastics are associated with challenges like environmental unsustainability. As a result, bio-based polymer composites have received much attention in past decades. Polymer matrices can not only be easily be reinforced with agricultural fibers to reduce price, but also improve mechanical and thermal properties. The aim of this study was to investigate the effect of magnesium hydroxide modification on properties of K85 and K98 rice husk varieties in Uganda for their use as reinforcement in polymer composites. Raw rice husks underwent pre-treatment in 4% Mg(OH) 2 concentration for 1 h at room temperature. Water absorption, thermogravimetric analysis (TGA), energetic density (ED), and fuel value index (FVI) of rice husks were investigated. Raw husks exhibited higher water absorption capabilities (9.1-11.2%) than modified rice husks (5.6-5.89%). TGA confirmed that alkali modification of rice husks provides a higher resistance to thermal degradation than that of raw husks. Mean reactivity to char residues ratio reduced from 4.3 × 10 −4 to 3 × 10 −4 °C/min upon modification of K85 rice husks while modification of K98 rice husks led to increasing mean reactivity to char residues ratio by 11.4%. ED sharply reduced upon alkali modification of both K85 and K98 rice husks. FVI of rice husks greatly depended on the amount of ash in the rice husks. As such, K85 husks had higher FVI than K98 husks as the former had lower ash compositions (21.2%). The results suggest that alkalimodified rice husks can be successfully used as reinforcement in polymer composites.

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“…ex Benth, and Uapaca kirkiana Müll. Arg are mainly used for fuel by local communities [6]. The literature on characterization of properties of hardwood tree species in Southern Africa has expanded [7]; however, there are still limited studies on these species [8].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of the Tropical Hardwood – Tree Species for Renewable Energy Production in Zambia

Shakacite¹,

Ng’andwe²,

Nyirenda³

et al. 2023

Environmental Sciences

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This work studied the diversity, abundance, and distribution of 25 most suitable indigenous tropical hardwood tree species for value-added renewable energy production. The study aimed to assess relative abundance, diversity, distribution, current status, and uses by local communities of these species which are still poorly known. The study is based on data from nationwide remeasured permanent sample plots for Zambia covering different types of forests in agro-ecological zones 1 and 2. Diameter at breast height (DBH) ≥2.5 cm was collected and analyzed in all plots. The study approach included informant interviews that focused on species’ uses and their availability in the surrounding forests and woodlands and species population inventory of the natural forests and woodlands. The tree species for renewable energy production were determined. The species were identified on the basis of abundance, diversity, regeneration status, and perceived utilization. The study observed the need to manage hardwood supply sustainably, promote lesser-known hardwood tree species, and diversify their use in the wood industry. The intervention of government and other stakeholders to tackle wood fuel production problem using collaborative approach is emphasized.

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Characterization of Miombo species used by rural communities as fuelwood in Northern Mozambique

Cited by 12 publications

References 28 publications

Thermal and mechanical characteristics of local firewood species and resulting charcoal produced by slow pyrolysis

Thermal and mechanical characteristics of local firewood species and resulting charcoal produced by slow pyrolysis

Characterization of Rice Husks as Potential Reinforcement for Polymer Composites

Characteristics of the Tropical Hardwood – Tree Species for Renewable Energy Production in Zambia

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