Browsing by Author "Ajimotokan, H. A."
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Item Combustion characteristics of selected tropical wood residues in relation to particle size(Published by Journal of Solid Waste Technology and Management, Department of Civil Engineering, Widener University, United States, 2018) Rabiu, A. B.; Lasode, O. A.; Ajimotokan, H. A.; Afolayan, V. A.Evaluation of combustion properties of biomass wood species is becoming more needful to improve and enhance the development of their utilisation as energy fuels. The study evaluates the particle size effect on energy potentials of commercially available tropical wood residues - Teak (Tectona grandis, TG), Apa (Afzelia africana, AA) and Ara (Albizia pedicellaris, AP), collected from Ilorin, Nigeria. These tropical wood species were pulverised into different particle sizes of less than 0.25 mm, 0.25 - 0.5 mm and 0.5 - 1.0 mm. The moisture content, volatile matter, ash content, fixed carbon, calorific (heating) value and elemental composition of these wood species samples for different particle sizes were evaluated in accordance to ASTM standards. The particle size of 0.5 - 1.0 mm presented the best quality within the considered particle sizes. Sample AA has the highest calorific value of 30.03 MJ/kg at particle size of 0.5 - 1.0 mm, while sample TG has lowest energy value at less than 0.25 mm with energy content of 8.84 MJ/kg. The results obtained revealed that particle size plays a significantly role in combustion properties of woody biomass residues as solid fuel.Item Densification of tropical wood residues for the development of solid fuels(Proceedins of International Conference on Sustainability, Energy & Environment-Hawaii 2019, 2019) Rabiu, A. B.; Lasode, O. A.; Popoola, O. T.; Babatunde, O. P.; Ajimotokan, H. A.Densification of materials through pelletisation, briquetting and cubing to form strong and durable bonding products with greater structural homogeneity, better handling and durability properties has attracted the attention of researchers in recent past. The present work focused on conversion of residues of some tropical wood species to energy fuel through pelletisation. The woody-biomass species studied were Apa (Afzelia Africana, AA), Iya (Daniella oliveri, DO) and Arira (Detarium microcarpum, DM) which were sourced in Nigeria. The samples were prepared in different sizes of less than 0.50 mm, 0.50 - 1.00 mm and 1.00 - 1.70 mm after drying in a laboratory environment. The different particle sizes were forced into a prepared die using gelatinised starch as binder. Higher heating value (HHV), impact resistance index (IRI) and water resistance test were obtained for all samples with and without binder. The average HHV of pellets produced from DM was found to be 26.53 MJ/kg without binder, which is the highest among the three samples, showing that DM may have higher lignin content. However, pellet samples AA produced with binder has average HHV of 25.41 MJ/kg which is highest among the three samples. Result showed that IRI increases as particle size decreases for pellets produced without binder, while for pellet with binder, IRI increases as the particle size increases. Result of water resistance test showed that the disintegration time increases as particle size decreases. The basic physical properties that enhance handling and transportation operations of wood pellets have been achieved when compared with standard.Item The effects of storage time on fuel properties of Jatropha biodiesel blends(Journal of Bioresources and Bioproducts, 2018) Ajimotokan, H. A.; Rabiu, A. B.; Lawal, A. R.This study investigates the effects of storage time on fuel properties of biodiesel made from Jatropha oil and its blends with mineral diesel at different percentage compositions. The influence of storage stability on selected fuel properties such as kinematic viscosity, density, pour, cloud and flash points for Jatropha biodiesel and its blends at varying storage times were investigated using standard test methods. The biodiesel obtained through trans-esterification of Jatropha oil was blended with mineral diesel to obtain fractional samples of B20 (20% biodiesel blend), B40 (40% biodiesel blend), B60 (60% biodiesel blend) and B100 (100% neat biodiesel). Results show that kinematic viscosity and density increase for each blend over the 12 weeks of storage period. Flash, cloud and pour points decrease for each blend over the period of study. B20 was observed to be the optimum blend mix as its fuel properties were relatively unchanged over the storage period when compared to that of mineral diesel. It can be implied from the research that while properties like kinematic viscosity and density deteriorate with time; flash, cloud and pour points are observed to have improved with storage time.Item Hydrology of River Oyun and Hydropower Potential of Unilorin Dam, Ilorin, Kwara State(New York Science Journal, 2011) Sule, B. F.; Salami, A. W.; Bilewu, S. O; Adeleke, O. O.; Ajimotokan, H. A.Item Introduction to Workshop Practice(University of Ilorin Publishing House, 2017) Ajimotokan, H. A.; Abdulkareem, S.