Engineering Mechanics

Proceedings Vol. 31 (2025)

ENGINEERING MECHANICS 2025

Copyright © 2025 Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, Prague

 

Chudý D., Jegla Z.
pages 53 - 56, full text

The Czech Republic is transitioning to low-emission energy sources, planning to decommission coal-fired power plants by 2033. Combined cycle power plants (CCGT) are key to this transition, achieving around 60% efficiency by utilizing natural gas combustion and waste heat recovery in heat recovery steam generator (HRSG) boilers. This paper focuses on enhancing heat transfer in HRSG boilers using finned tubes, which increase the heat exchange surface area on the flue gas side. Three types of finned tubes are analyzed: Spiral Solid Fin, Serrated Fin SF, and Serrated Fin HF. The study uses the BoilerDesigner calculation program to compare their performance. Results show that Serrated Fin HF provides the highest heat output, making it optimal for HRSG design. The paper details the technical properties and performance metrics of each tube type, including heat output, pressure drop, overall heat transfer coefficient, and heat exchange area. Design considerations are discussed, with a focus on optimizing geometric design for desired performance. The study identifies optimal fin density for different configurations and recommends specific designs for superheaters in HRSGs. The paper concludes that further modifications could enhance performance, with Serrated Fin SF as a promising alternative for future research. The findings support the sustainable development of CCGTs and the transition to low-emission energy sources.

Ownership of copyright in original research articles remains with the Authors, and provided that, when reproducing parts of the contribution, the Authors acknowledge and/or reference the Proceedings, the Authors do not need to seek permission for re-use of their material.

All papers were reviewed by members of the scientific committee.