Browsing by Author "Oni, A. O"

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Energy and cost analysis of organic fertilizer production in Nigeria
(Elsevier Limited, 2010) Fadare, D. A.; Bamiro, O. A.|.; Oni, A. O
Energy study was conducted in an organic fertilizer production plant in Nigeria to determine the energy consumption patterns and the associated costs for the production of both powdered and pelletised fertilizer. Analysis was conducted for a daily production of 9000 kg of the finished products. Eight and nine defined unit operations were required for production of powder and pellets, respectively. The electrical and manual energy required for the production of powder were 94.5 and 5.6% of the total energy, respectively, with corresponding 93.9 and 5.1% for the production of pellets. The respective average energy intensities were estimated as 0.28 and 0.35 MJ/kg for powder and pellets. The most energy intensive operation was identified as the pulverizing unit with energy intensity of 0.09 MJ/kg, accounting for respective proportions of 33.4 and 27.0% of the total energy for production of powder and pellets. The energy cost per unit production for powdered and pelletised fertilizer using generator were evaluated as #2.92 ($0.021) and #3.87 ($0.028), respectively, with corresponding values of #1.65 ($0.012) and #2.00 ($0.014) when electrical energy from the national grid was used. The energy intensities for the production of organic fertilizers were significantly lower than that of inorganic fertilizers.
Energy and exergy analyses of malt drink production in Nigeria
(Elsevier Limited, 2010-12) Fadare, D. A.; Nkpubre, D. O.|.; Oni, A. O; Falana, A.; Waheed, M. A.; Bamiro, O. A
Energy requirements and exergy inefficiencies for processing of malt drink were estimated for a Nigerian brewery. The process was divided into twenty-one basic unit operations and grouped into four main group operations: silo house, brew house, filter room and packaging house. The energy intensity for processing a batch of 9.8 tonnes brew grains to 562 hl of malt drink was estimated as 261.63 MJ/hl consisting of electrical (41.01%), thermal (58.81%) and manual (0.19%) of the total energy. The most energy intensive group operation was the Packaging House operation, followed by the Brew House operation with energy intensities of 223.19 and 35.94 MJ/hl respectively. The exergy analysis revealed that the packaging house operation was responsible for most of the inefficiency (92.16%) followed by brew house operation (7.17%) and the silo house and filter room operations with less than 1%of the total exergy lost. The most exergy loss took place in the pasteurizer which accounted for 59.75% of the overall system inefficiency. Modification in the pasteurizer and use of spent grains as alternate source of energy in the steam boiler were recommended to improve the energy efficiency of the system.
Exergetic analysis of atmospheric distilation plant: a case study of WRPC refinery
(2010) Fadare, D. A.; Oni, A. O; Waheed, M. A.
Exergetic analysis of atmospheric distilation plant of Warri Refinery and Petrochemical Company (WRPC) was conducted to evaluate exergy efficiencies and irreversibilities in each unit of the system with aim of identifying potential ares for improvement. The process simulation was carried out using commercial simulator HYSYS 2003. The results of the simulation compared reasonably well with actual plant process parameters with a relative error of 7.22%. The highest irreversibility occured in the main fractionator followed by TPA, IPA, kerosene stripper, BPA, LGO stripper and HGO strippers with their respective values of 80.17, 5.05, 5.01, 0.77, 0.76, 0.42 and 0.12 GJ/h, of processed crude. The main cause of thermodynamic irreversibility in the system was due to uncontrolled mixing of process streams without due consideration of their potential to produce work. Base on the assessment of the system, the stage by stage exergy profile generates ideas about how the improvement can be made in order to reduce irreversibilities in the components. After modification, the exergy efficiencies show an increase of 21.8% for the fractionator, 19.5% in KERO striper, 15.3% in HGO striper and 10.3% in the LGO striper.