Study on effective parameter of the triple-pressure reheat combined cycle performance

Abstract

The thermodynamic analyses of the triple-pressure reheat combined cycle gas turbines with duct burner are presented and discussed in this paper. The overall performance of a combined cycle gas turbine power plant is influenced by the ambient temperature, compression ratio, and turbine inlet temperature. These parameters affect the overall thermal efficiency, power output, and the heat-rate. In this study a thermodynamic model was developed on an existing actual combined cycle gas turbine. The code of the performance model for combined cycle gas turbine power plant was developed utilizing the THERMOFLEX software. The simulating results show that the total power output and overall efficiency of a combined cycle gas turbine decrease with increase the ambient temperature because increase the consumption power in the air compressor of a gas turbine. The totals power of a combined cycle gas turbine decreases with increase the compression rate, while the overall efficiency of a combined cycle gas turbine increases with increase the compression ratio to 21, after that the overall efficiency will go down. Far there more the turbine inlet temperature increases the both total power and overall efficiency increase, so the turbine inlet temperature has a strong effect on the overall performance of combined cycle gas turbine power plant. Also the simulation model give a good result compared with MARAFIQ combined cycle gas turbine power plant. With these variables, the turbine inlet temperature causes the greatest overall performance variation.