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CPOTE2022 logo
7th International Conference on
Contemporary Problems of Thermal Engineering
Hybrid event, Warsaw | 20-23 September 2022

Abstract CPOTE2022-1098-A

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Off-design simulation of the gas turbine and water heat recovery boiler operation using thermodynamic model and correction factors

Maciej BUJALSKI, PGE Energia Ciepła S.A., Poland
Paweł MADEJSKI, AGH University of Science and Technology, Poland
Krzysztof FUZOWSKI, PGE Energia Ciepła S.A., Poland

The paper presents the results of the thermodynamic model of the GE LM6000-PF gas turbine with a water heat recovery boiler. The maximum electrical power output of the unit is 48 MWe. The turbine is a part of the cogeneration heat and power plant (CHP). The model was developed in the Ebsilon Professional software. The efficiency of the gas turbine and the output power strictly depend on operating conditions, such as the thermophysical parameters of the inlet airflow. To control the unit operation as well as during the conceptual analyses, the detailed thermodynamic models are increasingly used. Simulations are particularly applicable to the ongoing optimization of the CHP plant operation through short-term planning of energy production, where hourly production parameters are needed to be forecasted on a day-ahead time horizon. The method of the production parameters calculation (electric power, heat output, fuel consumption, exhaust gas composition) was discussed. The procedure for validating the model using the correction coefficients determined based on the real data was presented. The outcome of the model in the form of hourly gas turbine parameters was presented and compared with real ones coming from measurement data from several months of operation. The results accuracy obtained thanks to the developed model is significantly increased when the correction factors are implemented. The mean percentage error of the model was approximately 1%, 3%, and 1.6% for electric power, heat output, fuel mass flow, respectively.

Keywords: Gas turbine, Thermodynamic modelling, Combined heat and power (CHP), Mathematical modelling, Boiler heat exchanger