PERFORMANCE MODELING OF SOLAR RETROFITS IN COMBINED CYCLE POWER PLANT
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Abstract
The aim of this project is the modelling and simulation of GT13E2 combined cycle gas turbine with the aid
of the software EBSILON PROFESSIONAL, and carrying out analysis on solar retrofit. The design mode was modeled using guaranteed performance data from the plant, in the off design, temperature variation at inlet to compressor and other analysis were carried out. The model results were validated by comparing the actual operating data using error percentage analysis. The validation results obtained ranged from -0.0038% to 0% in design condition, while the results varied from -0.9202% to 10.24%. From the research, we can conclude that as ambient temperature increases, the mass flow rate of air reduces and as such this reduces the power that can be developed in the gas turbine. Also, since the energy available in the flue gas from the gas turbine is reduced at higher ambient temperature, the power developed in the steam turbine reduces also. At higher ambient temperature, the overall cycle efficiency decreases.
In order to maintain the design exhaust temperature, extra fuel has to be burned to extend the combustion
process. The results achieved from the simulation of solar boosting revealed that as mass flow of solar steam
increases, power developed in the steam turbine increases. However since the HRSG is a heat sensitive
component, the limit to the amount of solar steam that can be added is 3Kg/s. If extra mass of water is
added, issues will arise in the most critical part of the HRSG which is the evaporator. If the energy available
at the location of the evaporator is not enough, steam would not be generated hence the steam cycle would
fail. From the analysis and simulation of the High pressure solar boosting and the Low pressure solar boosting, we can conclude that the highest extra power generated in the high pressure solar boosting is 3.2 MW while that of low pressure solar boosting is 1.7 MW, hence high pressure solar boosting is the best configuration.
of the software EBSILON PROFESSIONAL, and carrying out analysis on solar retrofit. The design mode was modeled using guaranteed performance data from the plant, in the off design, temperature variation at inlet to compressor and other analysis were carried out. The model results were validated by comparing the actual operating data using error percentage analysis. The validation results obtained ranged from -0.0038% to 0% in design condition, while the results varied from -0.9202% to 10.24%. From the research, we can conclude that as ambient temperature increases, the mass flow rate of air reduces and as such this reduces the power that can be developed in the gas turbine. Also, since the energy available in the flue gas from the gas turbine is reduced at higher ambient temperature, the power developed in the steam turbine reduces also. At higher ambient temperature, the overall cycle efficiency decreases.
In order to maintain the design exhaust temperature, extra fuel has to be burned to extend the combustion
process. The results achieved from the simulation of solar boosting revealed that as mass flow of solar steam
increases, power developed in the steam turbine increases. However since the HRSG is a heat sensitive
component, the limit to the amount of solar steam that can be added is 3Kg/s. If extra mass of water is
added, issues will arise in the most critical part of the HRSG which is the evaporator. If the energy available
at the location of the evaporator is not enough, steam would not be generated hence the steam cycle would
fail. From the analysis and simulation of the High pressure solar boosting and the Low pressure solar boosting, we can conclude that the highest extra power generated in the high pressure solar boosting is 3.2 MW while that of low pressure solar boosting is 1.7 MW, hence high pressure solar boosting is the best configuration.
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