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<p>In gas turbine combined cycles, the Exhaust Gas Recirculation (EGR) strategy combined with variable Inlet Guide Vane (IGV) angles offers potential efficiency gains at part-load by sustaining higher turbine inlet and exhaust temperatures. However, the practical application requires assessing its suitability across diverse ambient temperatures, given the varying climates in different regions. This study proposes a fuel consumption calculation method to evaluate the effectiveness and feasibility of the Exhaust Gas Recirculation-Inlet Guide Vane Control (EGR-IGVC) strategy under real-operation conditions, focusing on fuel savings across northern and southern China. To account for power plant output uncertainty, ambient temperature, and power output are treated as independent variables, allowing a more reasonable evaluation of the strategy’s impact on part-load performance to meet various peak-shaving demands. Results indicate that implementing EGR-IGVC is feasible for F-class gas turbines when the ambient temperature remains below the allowable upper limit, which varies from about 30°C to 40°C under different load conditions. At a 358 MW power output (90% load), this strategy yields an efficiency improvement of 0.38–1.02 percentage points over the ambient temperature range of −20°C to 20°C. Regional analyses show a greater impact in northern China, with estimated annual natural gas savings of 2121.78 t (1.21%) compared to 1006.11 t (0.58%) in southern regions for 2021, underscoring the modification’s practical benefits across different climates.</p>

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Exhaust Gas Recirculation-Based Load Regulation for Improving Part-Load Performance of Combined Cycles across Varying Ambient Temperatures in China

  • 期刊论文

  • 发表日期：

    2026年4月23日

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  • Keying Li,
  • Hao Qu,
  • Jingfan Liu,
  • Shijie Zhang

摘要

In gas turbine combined cycles, the Exhaust Gas Recirculation (EGR) strategy combined with variable Inlet Guide Vane (IGV) angles offers potential efficiency gains at part-load by sustaining higher turbine inlet and exhaust temperatures. However, the practical application requires assessing its suitability across diverse ambient temperatures, given the varying climates in different regions. This study proposes a fuel consumption calculation method to evaluate the effectiveness and feasibility of the Exhaust Gas Recirculation-Inlet Guide Vane Control (EGR-IGVC) strategy under real-operation conditions, focusing on fuel savings across northern and southern China. To account for power plant output uncertainty, ambient temperature, and power output are treated as independent variables, allowing a more reasonable evaluation of the strategy’s impact on part-load performance to meet various peak-shaving demands. Results indicate that implementing EGR-IGVC is feasible for F-class gas turbines when the ambient temperature remains below the allowable upper limit, which varies from about 30°C to 40°C under different load conditions. At a 358 MW power output (90% load), this strategy yields an efficiency improvement of 0.38–1.02 percentage points over the ambient temperature range of −20°C to 20°C. Regional analyses show a greater impact in northern China, with estimated annual natural gas savings of 2121.78 t (1.21%) compared to 1006.11 t (0.58%) in southern regions for 2021, underscoring the modification’s practical benefits across different climates.