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Search Results: 1 - 7 of 7 matches for " Sidum Adumene "
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Assessment of Site Parameters and Heat Recovery Characteristics on Combined Cycle Performance in an Equatorial Environment  [PDF]
Sidum Adumene, Samson Nitonye
World Journal of Engineering and Technology (WJET) , 2016, DOI: 10.4236/wjet.2016.42032
Abstract: This paper investigates the effects of site based parameters such as ambient temperature, humidity, altitude and heat transfer characteristic of a dual pressure heat recovery system on the performance of the combined cycle power plant within an equatorial environment. The bulk heat utilization and configuration of a dual pressure heat recovery system are investigated. It is observed that the heat system configuration play a vital role in optimizing the combined cycle overall performance, which has proportionality relationship with the operating ambient temperature and relative humidity of the gas turbine. The investigation is carried out within the ambient temperature range of 24 to 35, relative humidity of 60% to 80%, and a high level steam pressure of 60 bar to 110 bar. The results show that at 24 ambient temperature, the heat recovery system has the highest duty of 239.4 MW, the optimum combined cycle power output of 205.52 MW, and overall efficiency of 47.46%. It further indicates that as the ambient temperature increases at an average exhaust gas temperature of 530 and mass flow of 470 kg/s, the combined cycle power output and efficiency decrease by 15.5% and 13.7% respectively under the various considerations. This results from a drop in the air and exhaust mass flow as the values of the site parameters increase. The overall results indicate that decreasing the ambient temperature at optimum exhaust gas flow and temperature increases the heat recovery system heat duty performance, the steam generation, overall combined cycle power output and efficiency, which satisfies the research objective.
Application of Probabilistic Model for Marine Steam System Failure Analysis under Uncertainty  [PDF]
Sidum Adumene, Samson Nitonye
Open Journal of Safety Science and Technology (OJSST) , 2018, DOI: 10.4236/ojsst.2018.82003
Abstract: In ship and offshore operations, machinery systems have associated operational hazard because of the prevailing harsh environment. Therefore, the need for an overall evaluation of the associated risk and failures of these systems, such as the marine steam boiler, is crucial to the industry. The concept of probability risk model is used to model the failure mode considering the overall risk associated with the system as a whole. The rate of occurrence of the failure that described the basic events as represented by the fault tree was developed to model the marine steam system. This specific event was implemented and evaluated to estimate the failure frequencies of the overall systems, based on the available failure rate in core literatures. A risk model which is hazard severity weight with its failure frequencies, and the time of operation was applied in the analysis. The probability of failure of the boiler system was estimated at 0.323225 at 35,040 operating hours with hazard severity weight of catastrophic if it occurs. The associated failure frequency calculated for the period is 1.114 × 10-5. The over failure frequency of the marine steam system for the period of consideration is conditioned on the pre-defined minimum cut sets of the top event. This therefore agreed with the fact that the basic events with their failure frequencies will lead to the catastrophic failure of the entire system within the period if the maintenance plan is not proactive.
Performance Optimization of Dual Pressure Heat Recovery Steam Generator (HRSG) in the Tropical Rainforest  [PDF]
Sidum Adumene, Barinaadaa Thaddeus Lebele-Alawa
Engineering (ENG) , 2015, DOI: 10.4236/eng.2015.76031
Abstract: This work evaluates the performance optimization of heat recovery steam generator system in Afam VI power plant, Rivers State. Nigeria. Steady state monitoring and direct collection of data from the plant was performed including logged data for a period of 12 months. The data were analysed using various energy equations. Hysys software was used to model the temperature across the heating surfaces, and MATLAB software was used to determine the heat transfer coefficient, heat duties, steam flow, effectiveness of the HRSG. The optimization technique was carried out by varying the exhaust gas flow, exhaust gas temperature, steam pressure and the theoretical introduction of duct burner for supplementary firing. The results show that between 490 and 526, the percentage increase in the overall heat absorbed in the HRSG is 37.39%. It also show that for an increase in the exhaust gas mass flow by 80 kg/s, the steam generation increase by 19.29% and 18.18% for the low and high pressure levels respectively. The overall result indicates an improvement in the HRSG energy efficiency and steam generation. As the exhaust gas mass flow and temperature increases, the steam generation and system effectiveness greatly improved under the various considerations, which satisfy the research objective.
Numerical Design and Performance Analysis of a Tug Boat Propulsion System  [PDF]
Samson Nitonye, Sidum Adumene, Ukpokpo Umorami Howells
Journal of Power and Energy Engineering (JPEE) , 2017, DOI: 10.4236/jpee.2017.511007
Abstract: The aim of this project is to design and analyze the propulsion system for a tugboat for optimum performance. In so doing, certain approved procedures were followed; these procedures included getting the desired tugboat dimension, using ITTC methods, Gertlers charts, Bp charts etc. to estimate the bare hull resistance of the tugboat, estimating the effective power that must be employed to overcome this tug resistance. Numerical software code was developed to determine the various performance indicators of the propulsion system. The effective power was used as a basis for selecting the main engine and designing of a suitable propeller capable of propelling the tugboat for the various sea state were evaluated. Propeller cavitation was also put into consideration during this design. Hence in matching the engine to the propeller a series of calculations were done across a speed range of 300 - 500 rpm in other to effectively ascertain the engine-propeller matching point. The result shows that the point of engine-propeller matching is at 335 rpm and 2550 KW respectively. This provides a guide for the selection of a main engine with an acceptable sea service margins. All designs were done in accordance to classification organization and regulations.
Performance Analysis of an Energy System in the Tropical Rainforest: A Thermo-Economic Approach  [PDF]
Barinyima Nkoi, Kenneth Israel, Sidum Adumene
Journal of Power and Energy Engineering (JPEE) , 2018, DOI: 10.4236/jpee.2018.61002
Abstract: This paper presents the thermos-economic evaluation of a simple gas turbine (SGT) within the Niger Delta, Nigeria. Steady-state monitoring and direct collection of data from the 25 MW plant were performed including logged data for a 12 months period. MATLAB software was used to model the various thermodynamic performance equations of the plants while net present value (NPV), internal rate of return (IRR), and Payback period (PBP) were used to model the economic concept of the plant performance. The thermodynamic analysis shows that for every 1℃ rise in the ambient temperature, the percentage power drop increases by 2.07%, thermal efficiency drops by 0.66%, and the specific fuel consumption increases by 0.93%. For every 1% drop in the power output, the percentage thermal efficiency drops by 0.79% for the given consideration. The economic analysis based on the performance reveals that the power shortages represent about 47.9% of the net power generated and the revenue worth of $4198741.60 is lost due to the inability of the plant to perform at its design point. The NPV value of $6434899.97 shows that the plant investment is viable for the period of twenty years of operation and the IRR on investment is determined to be 12.40% by a numerical approximation for the period, with a PBP of 8.5 years. This provides technical and economic details to plant operators and energy systems investors for decision making.
Design Analysis of a Lightweight Solar Powered System for Recreational Marine Craft  [PDF]
Daniel Tamunodukobipi, Nitonye Samson, Adumene Sidum
World Journal of Engineering and Technology (WJET) , 2018, DOI: 10.4236/wjet.2018.62027
Abstract: The design of a lightweight solar powered marine craft is considered in this report. Various design concepts were considered with respect to the hull type, resistance, aesthetics and the operating environment of the vessel. The planning hull-form catamaran was considered for the boat design. The resistance and other hydrodynamic characterization of boat were analyzed using the CAHI and Savitsky method. Detailed algorithm is developed for the sizing of the various components of the solar PV system for the boat. The hull resistance was found to be 740 N corresponding to the boat speed of 5knot using the above stated methods. The motor power was obtained to be 2.239kW (3 HP). Torqeedo outboard electric motor of 3HP was selected for the boat propulsion. The battery bank was seized accordingly and four batteries of 235 AH and 12 V were selected for the storage of electric power for the boat propulsion. Hence, the solar PV module was sized. It was concluded that, due to the limited space for the installation of the PV module, additional source of power (land base) should be made available to completely charge the battery.
Design and Off-Design Performance Evaluation of Heat Exchanger in an Offshore Process Configuration  [PDF]
Sidum Adumene, Thaddeus C. Nwaoha, Garrick P. Ombor, Joshua T. Abam
Open Access Library Journal (OALib Journal) , 2016, DOI: 10.4236/oalib.1102748
Abstract:
This research evaluates the thermal performance of an industrial heat exchanger for process in the offshore industry. Steady state monitoring and performance data were collected from 3-E-401 heat exchanger in an offshore environment. Design and off-design evaluation was carried out using capacity ratio, effectiveness, Log Mean Temperature Difference (LMTD), heat duty, and overall heat transfer coefficient as performance indicators. Three scenarios were presented and Hysys V8.7 software was used to model the process. The results showed that the best thermal performance of the heat exchanger in terms of capacity ratio, effectiveness, heat duty, LMTD, and overall heat transfer coefficient is 94%, 85.5%, 88%, 88.7% and 71% respectively, of the design values. This best performance was reached at 9.9% fouling and heat loss reduction in the heat exchange process. An increase in fouling and heat loss gradually reduced the thermal performance of the heat exchanger. Therefore a proactive maintenance action and condition monitoring in every eight weeks is required to sustain and improve the performance as evaluated.
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