Browsing by Author "Popoola, O. T."

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    Development of a bench-scale fluidized bed combustor (FBC) for coal and biomas combustion
    (Federal University of Technology, Minna, Niger State, Nigeria., 2015-03) Popoola, O. T.; Adio, S. A.; Oke, A. O.; Asere, A. A.
    The high technological level of equipment for combustion of fuels, as well as the necessity for rational and efficient use of non-renewable energy resources, has resulted demanding requirements that must be fulfilled by equipment for energy production, via combustion. These requirements form the characteristics of Fluidized bed Combustor (FBC). The objective of this work is to design and fabricate a Circulating FBC for the combustion of coal and biomass and present the design criteria considered in the combustion process. The Designed FBC was then tested by combusting coal (Lafia Obi) and biomass (coconut shell) using the relevant ASTM guidelines. For coal combustion, the characteristic quantities measured from the bench-scale fluidized bed combustion include a mean NOx emission of 455.35, 376.69, 323.35 and 277.35 ppm for a coal feed size of 10, 15, 20 and 25 mm respectively. NOx emission from the combustion of coconut shell in fluidized bed is low and further reduced by the introduction of secondary air. Secondary air increases the recoverable energy level from this biomass, while average CO emission was 13,080 16,620 17,040 and 19,140 ppm for a coal feed size of 10, 15, 20 and 25mm. The temperature in the fluidized bed at ≥ 1100oC was sustained.
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    ENERGY OUTPUT ASSESSMENT OF LAFIA-OBI COAL IN A FLUIDIZED BED COMBUSTOR
    (Faculty of Engineering, University of Nigeria, Nsukka : Nigerian Journal of Technology (NIJOTECH), 2018-10) Ilyas, E. O; Adewole, B. Z.; Adio, S. A.; Popoola, O. T.; Asere, A. A.
    This work investigated the energy output from the fluidized bed combustion of Lafia-Obi coal using five range of fuel equivalent diameters (FED) of 125 μm, 250 μm, 355 μm, 2.5 mm and 5.0 mm. Energy output in response to variation in bed temperature, FED, bed pressure, and fluidizing velocity was examined in the fluidized bed heat exchanger. Results indicated an increase in heat transfer rate by 80, 11 and 25% when 5 mm coal was reduced to 355, 250 and 150 μm respectively. Bed temperature increased by 8% for 355 μm and decreased by 6% when 5.0 mm coal was fired. Higher bed pressure was observed when larger particle sizes (5.0 and 2.5 mm) were fired. This resulted in poor bed temperature and increasing fluidization velocity and thus, reduced steam discharge temperature at the heat exchanger outlet.
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    Thermal Performance of a Reflector Based Solar Box Cooker Implemented in Ile-Ife, Nigeria
    (International Journal of Energy Engineering, 2015) Adewole, B. Z.; Popoola, O. T.; Asere, A. A.
    Different categories of solar cooker ranging from concentrator types, solar ovens, box type cookers with or without reflectors and indirect solar cookers have been designed and tested in Nigeria. The uses of different designs of solar cookers have not become acceptable in the rural areas due to number of reasons. It is either they are too expensive for individual family to afford or they are yet to be practically known. In view of these shortcomings, this paper presents thermal performance of low cost reflectors based solar box cooker implemented in Ile-Ife, Nigeria. The cooker was constructed with locally available materials. The thermal performance of the cooker in terms of figures of merits and cooker efficiency was evaluated based on Indian Standard (IS 13429:2000). Results of field evaluation show maximum insolation of 520 W/m2 at 2.00 pm and minimum of 246 W/m2 at 11.00 am. The average solar radiation and ambient temperature observed during the test periods were 403 W/m2 and 40°C respectively. The water temperature values between 60 and 67°C were observed at insolation values between 398 and 520 W/m2. These occur between the hour of 1:20 pm and 4:00 pm with the highest water temperature of 67°C at 3.00 pm. The performance of the cooker in terms of first figure of merit, second figure of merit and thermal efficiency show that the cooker compare favourably well with international standard. The cooker has a better heat retention capacity when compared with others found in the literature. The experimental results obtained for thermal performance of the cooker demonstrated its suitability for cooking even during fluctuating weather conditions.