Thermodynamic Optimization of a Combined Cycle Cogeneration Plant with Backpressure Steam Turbine

摘要

Cogeneration heat and power plant has a long history of application in many types of industries, buildings etc, because of its benefits, such as environmental, energy and cost saving. A useful type of Cogeneration plants is the combined cycle Cogeneration plant. In this paper, thermodynamic optimization analysis for this type of plant (with backpressure steam turbine) and its performance criteria have been developed. It has been shown that the most efficient plant, for a target stack temperature could be achieved when the gas turbine and steam cycle are designed for maximum specific net work and cycle efficiency respectively. For validation purpose, some standard market gas turbines, which have maximum of 6% error with the basic thermodynamic model, have been chosen in this study. Also it has been shown that the results of optimization of Cogeneration systems are in good agreement with those of standard turbines.