THERMOECONOMIC EFFECT OF AIR FUEL RATIO ON COMBINED CYCLE POWER PLANT AT VARIOUS PRESSURE RATIOS

Abstract

The objective of the presented research work is to develop an Thermoeconomic optimization method in order to predict the cost effectiveness of a combined cycle gas turbine (CCGT) power plant and suggest ways of improving the cost effectiveness from both thermodynamic and economic points of view The Thermoeconomic analysis provides a complete diagnosis of the performance of the combined cycle power plant, both in energetic and in monetary values. In this regard, Thermoeconomic optimization is a better tool as it combines the thermodynamic analysis with the economic principles. Here, appropriate costs are assigned to the thermodynamic inefficiencies of the system components, which add to the hidden cost. The system considered in this thesis is a combined cycle power plant. For this system, an energetic and economic analyses are performed to predict thermodynamic and economic parameters of the system. This system is Thermoeconomically optimized to reduce the specific total cost of the products, which leads to a reduction in the investment cost, and to an increase in the power output and efficiency A program of numerical code is established using MATLAB software to perform the calculations required for the thermal and economic analysis considering real variation ranges of the main operating parameters such as pressure, temperature air fuel ratio and mass flow rate. The effects of theses parameters on the system performances are investigated. The optimization results demonstrate that all three optimization methods can improve the thermodynamic and economic performance, but with different values. Thermoeconomic optimization method is the most effective method for designing and operating a system with high efficiency and low investment cost.