TY - JOUR
TI - Performance degradation analysis of combined cycle power plant under high ambient temperature
AU - Wan Anping
AU - Chen Ting
JN - Thermal Science
PY - 2022
VL - 26
IS - 2
SP - 1897
EP - 1906
PT - Article
AB - The mechanism of performance degradation of a natural gas combined cycle power plant under high ambient temperature is studied by analysing the performance characteristics and thermal properties of the working fluids. Real operating data under typical seasonal conditions are collected and studied. The results reveal that the power output of the natural gas combined cycle system decreases by 22.6%, and the energy efficiency decreases from 57.28-56.3% when the ambient temperature increases from 5-35°C. Gas turbine total power output and steam turbine power output decrease by 17.0% and 16.2%, respectively, as ambient temperature increases from 5-35°C. The enthalpy difference of the flue gas between the turbine inlet and outlet change slightly with varying ambient temperature. The fuel and air input decrease by 16.0% and 16.2%, respectively, as ambient temperature increases from 5-35°C. By analysing the calculated results, the decrement in air and fuel input d is considered as the immediate cause of system power output reduction. The proportion of power consumed by air compressor reaches 50.4% at 35°C. This is considered to be caused by air compressor idle.