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Energy and Power Engineering 2011年第3期3卷 207-220页

作者： Sunday Olayinka Oyedepo fagbenle richard olayiwola 不详

Preventive Maintenance Programme consists of actions that improve the condition of system elements for performance optimization and aversion of unintended system failure or collapse. It involves inspection, servicing, repairing or replacing physical components of machineries, plant and equipment by following the prescribed schedule. It is commonly agreed nowadays that preventive maintenance programme can be very successful in improving equipment reliability while minimizing maintenance related costs. The availability of a complex system, such as steam turbine power plant is strongly associated with its parts reliability and maintenance policy. That policy not only has influence on the parts’ repair time but also on the parts’ reliability affecting the system integrity, degradation and availability. The objective of this paper is to study the effects of Preventive Maintenance Programme (PMP) implementation on the performance of the Egbin 1320 MW thermal power plant in Nigeria. This paper considers the reliability and availability of the 6 x 220 MW steam turbine units installed in the power station. The reliability and availability of the turbines are computed based on a five-year failure database. The availability analysis of available data from 2005 to 2009 shows different results for each unit and variation in availability for different year: availability of unit1 varies between 59.11 to 91.76%;unit 2, 64.02 to 94.53%;unit 3, 28.79 to 91.57%;unit 4, 80.31 to 92.76% and unit 5, 73.38 to 87.76%. Unit 6 was out of service for the past 2 to 3 years. This indicates differences in their systems installation maintenance and operation.

关键词： Preventive Maintenance Programme Power Plant Reliability Availability Turbine

Forced Convection Thermal Boundary Layer Transfer for Non-Isothermal Surfaces Using the Modified Merk Series

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Open Journal of Fluid Dynamics 2014年第2期4卷 241-250页

作者： Ayodeji Falana richard olayiwola fagbenle Department of Mechanical Engineering University of Ibadan Ibadan Nigeria

The Chao and fagbenle’s modification of Merk series has been employed for the analysis of forced convection laminar thermal boundary layer transfer for non-isothermal surfaces. In addition to the Prandtl number (Pr) and the pressure gradient (∧), a third parameter (temperature parameter, γ?) was introduced in the analysis. Solutions of the resulting universal functions for the thermal boundary layer have been obtained for Pr of 0.70, 1.0 and 10.0 and for a range of ∧?. The results obtained for the similarity equations agreed with published results within very close limits for all the ∧’s investigated.

关键词： Boundary Layer Non-Isothermal Similarity Solutions Power-Law

A Review of Performance Appraisals of Nigerian Federal Government-Owned Refineries

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Energy and Power Engineering 2012年第1期4卷 47-52页

作者： Ismaila Badmus Miracle Olanrewaju Oyewola richard olayiwola fagbenle 不详

The aim of this paper is to review previous works on the performance appraisal of Nigerian government-owned refineries. The review has been done in a general sense, covering appraisal works by engineers, scientists, management experts, economists, sociologists and even historians. The outcome indicates that while there seems to be several works directly and/or indirectly assessing the performance of the refineries in a general sense, there is a dearth of such in the specific area of energy consumption. There also appears to be no single one appraising energy utilisation of all the refineries at the same time in the open literature. This is in spite of the fact that refining processes are energy intensive. Despite popularisation of exergy analysis as a veritable tool, the only energy utilisation appraisal within our reach which was carried out on just one of the refineries has not been done exergetically. However, the work still reveals, within the limitations of 1st Law energy analysis that the energy consumption patterns are below international benchmarks in the oil and gas industry. Some suggestions have also been offered to take care of the energy efficiency challenges in these refineries. These include plant to plant analyses of energy utilisation patterns in the four refineries, periodical determination of GHG emission levels in the refineries using current international best practices as benchmarks, use of exergy analysis to check avoidable energy wastage in the refining processes, shifting refinery fuelling pattern in favour of low carbon content fuels like natural gas and ensuring regular turnaround maintenance of the system.

关键词： Nigerian Refineries Energy Efficiency Exergy Analysis Review Performance Appraisal

Magnetic Field Enhancement in Ammonia-Water Absorption Refrigeration Systems

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Energy and Power Engineering 2014年第4期6卷 54-68页

作者： Moradeyo K. Odunfa richard O. fagbenle Olanrewaju M. Oyewola Olayinka S. Ohunakin Mechanical Engineering Department Covenant University Ota Nigeria Mechanical Engineering Department Obafemi Awolowo University Ile-Ife Nigeria Mechanical Engineering Department University of Ibadan Ibadan Nigeria

Absorption enhancement has been considered as an effective way of improving coefficient of performance (COP) of refrigeration systems and magnetic enhancement is one of these methods. A model of magnetic field enhancement in ammonia-water absorption systems is presented in this paper. A numerical model using finite difference scheme was developed based on the conservation equations and mass transport relationship. Macroscopic magnetic field force was introduced in the momentum equation. The model was validated using data obtained from the literature. Changes in the physical properties of ammonia solution while absorbing both in the direction of falling film and across its thickness were investigated. The magnetic field was found to have some positive effect on the ammonia-water falling film absorption. The results indicate that absorption performance enhancement increased with magnetic intensity. The COP of simple ammonia solution absorption refrigeration system increased by 1.9% and 3.6% for magnetic induction of 1.4 and 3.0 Tesla respectively.

关键词： Ammonia-Water Absorption Refrigeration Magnetic Field Force Ammonia Solution Concentration Coefficient of Performance Finite Difference Scheme Numerical Solution