Optimal Operating Parameters of 100MW Delta IV Ughelli Gas Turbine Power Plant Unit
Obodeh Otunuya,
Ugwuoke Philip Emeka
Issue:
Volume 6, Issue 5, October 2017
Pages:
68-74
Received:
16 August 2017
Accepted:
28 August 2017
Published:
3 November 2017
Abstract: The possibility of improving the overall efficiency of 100MW Delta IV Ughelli gas turbine power plant unit is presented. The study used Non-Dominated Sorting Genetic Algorithm (NSGA) to minimize the exergy destruction by optimally adjusting the operating parameters (decision variables). The adjusted operating variables were compressor pressure ratio rp, compressor isentropic efficiency ηic, turbine isentropic efficiency ηit, turbine inlet temperature T3, inlet flow rate of air ṁa and mass flow rate of fuel ṁf. The ambient temperature and pressure were held constant at 303K and 1.013 bar respectively because of location limitations. The optimization code was written in MATLAB programming language. The decision variables (constraints) were obtained randomly within the admissible range. The optimal values of the decision variables were obtained by minimizing the objective function (total exergy destruction). The choice of 300 generations was to enable the full utilization of the search space without putting strain on the computation time and complexity. The determined optimum values of the operating variables were rp= 12.41, ηic = 86.40%, ηit =89.12%, T3=1,486.36K ṁa =355.82kg/s and ṁf =8.62kg/s. The obtained optimal values of rp, ηic, ηit and T3 were higher than their base values while that for ṁa and ṁf were less. Increased rp brings about higher thermal efficiency while increased ηic guarantees less exergy destruction in the compressor. Increased ηic and T3 are crucial in decreasing the exergy destruction in the combustion chamber and in reducing the cycle fuel consumption. Reduced ṁa and ṁf play vital roles in the reduction of the total exergy destruction. They reduction also result in less emissions from the plant thereby decreasing the gas turbine’s negative impacts on the environment. Suggested coatings of compressor blades will lead to increased compressor efficiency whereas thermal barrier coatings of the hot sections of the plant will increase the lifespan of the parts at the designed firing temperature. Thermal barrier coatings also allow increased firing temperature while still maintaining the original designed lifespan.
Abstract: The possibility of improving the overall efficiency of 100MW Delta IV Ughelli gas turbine power plant unit is presented. The study used Non-Dominated Sorting Genetic Algorithm (NSGA) to minimize the exergy destruction by optimally adjusting the operating parameters (decision variables). The adjusted operating variables were compressor pressure rati...
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Analysis of a Photovoltaic Generator as a Means of Compensation in a Low Voltage Network
Nacer Mahfoudi,
Hocine Labar
Issue:
Volume 6, Issue 5, October 2017
Pages:
75-83
Received:
13 April 2015
Accepted:
12 June 2015
Published:
10 November 2017
Abstract: The photovoltaic applications are no longer limited to their use in remote sites. The current trend, particularly in industrialized countries is connected to the power grid individual installations, especially collective facilities and projects in the courtyard of this century will surely change our energy consumption habits. As part of this work we considered the use of mini photovoltaic plants connected to the low voltage grid as a means of compensation, generating electricity at the point of deficit. For this we analyzed the behavior of a MV / LV, which has voltage drops in two starts and tried to connect at the end of each starting of a photovoltaic mini plant in order to bring the network technical parameters (power voltage) in permissible limits.
Abstract: The photovoltaic applications are no longer limited to their use in remote sites. The current trend, particularly in industrialized countries is connected to the power grid individual installations, especially collective facilities and projects in the courtyard of this century will surely change our energy consumption habits. As part of this work w...
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