Browsing by Author "O. A. Lasode"

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Evaluation of thermal decomposition characteristics and kinetic parameters of melina wood
(Taylor and Francis, 2019-08-06) Adekunle Akanni Adeleke; J. K. Odusote; O. A. Lasode; Peter Pelumi Ikubanni; M. Madhurai; D. Paswan
The evaluation of thermal decomposition characteristics and kinetic parameters of melina wood were investigated. Proximate, ultimate and calorific value analyses of the melina wood were carried out based on standards. Melina wood was subjected to multiple heating rates (5–15 C/min) in thermogravimetric experiment. Two prominent isoconversional methods (Flynn-Wall-Ozawa and Starink) were adopted to obtain kinetic parameters from the non-isothermal thermogravimetric analysis curves. The ash, volatile matter and carbon contents of the melina were 2.15, 81.42 and 47.05%, respectively, while the calorific value was 18.72 MJ/kg. The main devolatilization stage of melina ranged from 220 C to 350 C while 80% weight loss was obtained below 400 C. The activation energy varied between approximately 15 and 162 kJ/mol as a function of degree of conversion. The pre-exponential factors varied between 1.60E þ 2 and 5.67 E þ 12/min. The decomposition kinetic mechanism of melina is concluded to be a multi-step reaction
Mild pyrolytic treatment of Gmelina arborea for optimum energetic yields
(Taylor and Francis, 2019-03-17) Adekunle Akanni Adeleke; Jamiu Kolawole Odusote; O. A. Lasode; Peter Pelumi Ikubanni; M Malathi; Dayanand Paswan
One of the most promising routes to produce solid biofuel from biomass is mild pyrolytic treatment (torrefaction). In the present study, mild pyrolytic treatment of Gmelina arborea was carried out to obtain optimum energetic yields (mass yield, higher heating value and energy yield). The biomass of 0.5–6 mm particle sizes were torrefied at two different temperatures, 240 and 300°C for residence time of 30 and 60 min. Full-factorial experimental method was used for the optimization of torrefaction conditions in order to produce solid fuel with high energetic yields. The analyses revealed that torrefied biomass was better in terms of heating value, proximate contents and fuel ratio. The results also showed that temperature has the largest effect on the energetic yields compared to residence time and particle size. The optimum torrefaction conditions that produced the highest energetic yields were temperature of 260°C, residence time of 60 min and particle size of 2 mm as predicted using the factorial linear models. The optimum conditions were experimentally validated and the energetic yields obtained were acutely close to those predicted using factorial linear models developed in this study. Hence, mild pyrolytic treatment at a temperature of 260°C, residence time of 60 min and particle size of 2 mm is useful to produce solid biofuel with maximum energetic yields.
Non-isothermal kinetic parametric evaluation of Tectona grandis using model-fitting methods
(Elsevier, 2021-02-07) Adekunle Akanni Adeleke; Peter Pelumi Ikubanni; Jamiu Kolawole Odusote; Thomas A. Orhadahwe; O. A. Lasode; Samuel Oluwafikayo Adegoke; Olanrewaju Seun Adesina
Abstract Non-isothermal kinetic parameters of the pyrolysis process of Tectona grandis were evaluated with different model-fitting methods. The thermal degradation of the Tectona grandis was examined using a thermogravimetric analyser. Pulverized Tectona grandis (6.5 mg) was heated from 30 to 800 °C at varying heating rates (5, 10 and 15 °C / m i n ) in an inert environment. The results depicted that heating rate has no effect on weight loss during the reactive drying zone. However, as the thermal analysis progressed into the active pyrolysis and passive pyrolysis zones, the weight loss decreased with increase in heating rate. The kinetic parameters evaluation revealed that the GB model was best fit to evaluate the kinetic parameters of teak in the active pyrolysis zone, while GB and Mampel models were considered most appropriate for the evaluation of the kinetic parameters in the passive pyrolysis zone. Model-fitting method has the capacity to capture wide range of fractional conversion.
Physico-mechanical properties of cement bonded ceiling board developed from teak and African locust bean tree wood residue
(Elsevier, 2021-02-17) I. O. Ohijeagbon; M.U. Bello-Ochende; Adekunle Akanni Adeleke; Peter Pelumi Ikubanni; A.A. Samuel; O. A. Lasode; O. D. Atoyebi
Over the years, the pursuit for locally sourced economical and environmentally safe materials has been on the increase in the development of composite boards. These locally sourced materials are organic materials from plants and livestock such as wood residue, feathers, rice husk, maize husk and bamboo fiber. Therefore, this study utilizes species of wood residue in the development composite ceiling boards. Ceiling boards were developed from teak and African locust bean tree wood residue using cement as a binder. The ceiling boards were made by varying the composite mass of the mix and mixing ratio of wood dust to cement. A constant load of 5 kN was used for the compaction process using a hydraulic pressing machine. Physico-mechanical properties of the ceiling boards such as moisture content, density, water absorption, drying shrinkage, tensile strength, and compressive strength were evaluated. The percentage of moisture content were 9.50 and 14.50% for teak and African locust bean tree wood dust, respectively. The values of density varied from 0.56 − 0.68 g/cm3. The water absorption ranged from 9.0 to 39.8% after 24 h immersion and drying shrinkage ranged from 8.60 to 35%. The maximum impact energy obtained is 98 J. The highest tensile, compressive and flexural strengths for the ceiling boards were 1.09, 0.82, and 0.56 MPa, respectively. The composite samples showed that ceiling boards made from teak wood dust is most suitable for interior use. Cement was found to be suitable as a binder for the development of ceiling boards.