Abstract
With the continuous development of combined cycle technology, mastering the thermal performance of combined cycle unit is beneficial to the system performance analysis, operation optimization and debugging. In this paper, the mathematical model of each component of the gas-steam combined cycle was established. Thermoflow software was used to calculate the thermodynamic performance of the system, and the influence of inlet temperature and gas turbine load on the thermodynamic performance of the system was analyzed. The results show that the model is reliable and the maximum error is 1.47%. When compressor inlet temperature increases by 10°C, gas turbine power decreases by about 5.8% and power generation thermal efficiency decreases by 0.15%. When the gas turbine load decreases by 10%, the thermal efficiency of combined cycle power generation decreases by 1.4%.
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