School of Engineering and Engineering Technology
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Item Open Access Exploratory study on the potential of coal fired power plant for energy production in Nigeria(Department of Electrical Engineering, University of Nigeria, Nsukka, 2013-02) Obiukwu, O.; Okozi, S.Nigeria’s industrialization is dependent on the utilization of its energy sources. In Nigeria, as in many developing countries, providing energy to rural and urban areas has proved to be a great challenge. At present, the energy consumption estimate in Nigeria is reaching 19.21billion KWh and is still rising. To counter this, the estimated generated energy, presently is 3,500MW which is insufficient to handle the Demand. This is quite low and alternative means have to be proposed. This paper looks at the potential of technologies to convert coal into fuels that can be used directly in place of gasoline and diesel. A power generating plant is proposed, which uses coal, which is in ample supply of about 396 Million Metric tons, as a feedstock. The plant is expected to use the Gasification technology, which converts solid coal to its synthetic gas form, which is further used to power Gas turbines for power generation. Its generating capacity is 750MW and has a Configuration of 2*2*2*1. This implies that it has 2 operating gasifiers/ cleaning system, 2 combustion Turbines, 2 Heat Recovery Steam Generators and 1 steam turbine.Item Open Access The effect of surface finish on the low cycle fatigue of medium carbon steel(Federal University of Technology, Owerri, 2024-10) Obiukwu, O. O.; Nwafor, O. M. I.; Okafor, B.; Osueke, G.As fatigue cracks initiate predominantly at the free surface of a material, the condition of the surface can be assumed to be critical with regards to fatigue strength. The features of a mechanically prepared surface which are considered to be major factors affecting fatigue strength fatigue are stress concentration (a shape factor), dimension (a scale factor), and surface finish (a technological factor). This paper investigates the effect of surface finish on the fatigue life of AISI/ SAE 1040 (medium carbon steels). A compositional analysis was performed to ascertain the percentage of carbon in the materials. The specimens were machined to a precise gauge length and diameter and exposed to various surface finishes mainly; polishing and grinding machining surface conditions. A fatigue test was performed with the use of Avery Dennison and bending stress was obtained using the curve supplied with the machine. The results from the machine were converted to Mega Pascal (MPa) and the values used to plot S-N curves. The fatigue resistance for the specimens at various surface finishes of the different carbon steels was thus established. The results show that the polished surface with surface roughness (Ra = 0.20microns) has the longest fatigue life.