Performance analysis of large-scale industrial gas turbine considering stable combustor operation using novel blended fuel

The allowable Wobbe index (WI) range proposed by gas turbine companies spans from 0 to 5%. System tuning is required when out-of-range fuel is used. In this study, thermodynamic analysis is conducted to study the gas turbine performance and operability of each component with the fuel exceeding 5% of WI. The novel diluting fuel supply system is employed to apply novel fuel compositions for the J-class gas turbine system. High-hydrocarbon and hydrogen blending fuels are used to study the operability and main parameters of each component. The largest diluent mass flow is required when 100% hydrogen fuel is used with nitrogen diluent method. The compressor cannot be operated with 100% hydrogen fuel due to the compressor surge. The maximum turbine blade temperature with steam diluent methods increases up to 80 degrees C. The power output and efficiency are enhanced with the increasing blending ratio of high-hydrocarbon and hydrogen employing two diluent methods. When the novel fuel supply system is considered for the stable operability of combustor, both its power and efficiency are increased; however, the operability of compressor and turbine is not always stable, especially with hydrogen fuel. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

This study investigates the impact of fuel exceeding the allowable Wobbe index range on gas turbine system performance through thermodynamic analysis. Different fuel compositions and diluent methods have varying effects on the operability and main parameters of each component.