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IMPROVEMENT OF ELECTRIC POWER SUPPLY TO PORT HARCOURT REFINING COMPANY, RIVERS STATE, NIGERIA
Abstract— The study presents an improvement to electric power supply to Port Harcourt Refining Company, Rivers State, Nigeria. A combined Gas-Steam Turbine Power Supply System was proposed and modelled based on typical Rankine and Brayton Cycles used in the operation of gas and steam turbines respectively. MATLAB / SIMULINK, was used to model the gas turbine cycle and the steam turbine cycle with their respective governors to generate data for the analysis within a simulated environment, using tools from the SimPower Systems Toolbox. The model was used to determine the ideal and actual turbine powers, turbine isentropic efficiency and exergy calculation. The performance analysis indicated a linear response with graded increase in MW output power of the turbine for a corresponding increase in ambient temperature. The analysis also showed that the exergy destroyed due to rise in ambient temperature at a specified base inlet temperature of 100oC (373K) decreases for every increase in ambient temperature. The sensitivity analysis indicated reduction in output power with increase in inlet temperature while the exergy destroyed for sensitivity analysis on the other hand exhibited a random fluctuation with several peaks indicating a tendency to increase. At implementation, 2 x 30MW Gas turbine generating plant (Rankine Cycle) was install to run in parallel with the existing 4 x l4MW Steam turbine generating plant (Brayton Cycle). The power generated by the turbines is able to meet the energy demand of the facility as well as its environs.
Index Terms— Demand Energy, Gas-Steam Turbine Power, Rankine and Braxton Cycle, Exergy, Power Generation Expension.