Session: Student Poster Competition

Submission Number: 186918

Influence of Dynamic Modeling on Start-Up Simulation of Industrial Gas Turbines 

As the expansion of renewable energy increases the demand for flexible operation of industrial gas turbines, the need for gas turbine modeling to investigate safe and rapid start-up is increasing. To analyze the start-up operation, the major dynamic characteristics of the gas turbine, such as shaft inertia, thermal inertia, and volume inertia, must be considered. Such dynamic characteristics significantly affect the performance of gas turbines during start-up operation. Therefore, to enable a higher-fidelity analysis of the start-up operation, dynamic characteristics must be appropriately incorporated into the gas turbine modeling. To this end, studies examining the impact of dynamic modeling on start-up simulation results should be conducted in advance. This study analyzed the variations in start-up simulation operating characteristics resulting from dynamic modeling of industrial gas turbines. Based on these findings, a dynamic modeling capable of effectively incorporating key dynamic characteristics was presented.

The simulations were performed using the commercial program Flownex SE. A gas turbine modeling capable of start-up analysis was developed by incorporating dynamic modeling, a start-up controller, a performance map including the sub-idle region, IGV, a starter, and a bleed valve. The start-up simulation results obtained from the developed model were validated through comparison with field data, thereby confirming the validity of the gas turbine modeling developed in this study.

Subsequently, the effects of adjusting key dynamic modeling parameters on start-up operation were analyzed, and a dynamic modeling based on correction-factor tuning was presented. The key parameters for dynamic modeling were selected as shaft inertia, component volume, heat transfer coefficient, metal density, and the compressor length ratio. It was confirmed that by introducing and tuning correction factors for these dynamic parameters, key dynamic behaviors such as shaft speed, the time delay in working-fluid temperature variation, metal temperature, and heat soaking energy can be effectively calibrated.

The results presented in this study are expected to improve the accuracy of start-up analysis based on thermal performance modeling. In future, the results of this study will be used to conduct a research on fast start-up operation and start-up stability assessment.

Presenting Author: Yong Hyeon Kwon Inha university

Presenting Author Biography: Yong Hyeon Kwon is a Ph.D. student in the Department of Mechanical Engineering at Inha University, Republic of Korea. His research interests include gas turbine performance analysis and hydrogen co-fired gas turbines.

Authors:

Yong Hyeon Kwon Inha university
Jin Seo Kim Inha university
Tong Seop Kim Inha university