Impact of Heat Transfer on Transient Stress Fields in Power Plant Boiler Components

Jerzy Okrajni, Mariusz Twardawa and Krzysztof Wacławiak
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Jerzy Okrajni: Faculty of Materials Engineering, Silesian University of Technology, 44-100 Gliwice, Poland
Mariusz Twardawa: RAFAKO S.A., 47-400 Racibórz, Poland
Krzysztof Wacławiak: Faculty of Materials Engineering, Silesian University of Technology, 44-100 Gliwice, Poland

Energies, 2021, vol. 14, issue 4, 1-19

Abstract: In boilers operating in modern power plants, thick-walled elements of complex shapes, such as valves, superheater headers, T-pipes, Y-pipes, four-way pipes, and elbows, are especially prone to fatigue processes. Higher operation parameters and more frequent startups may speed up fatigue damage in these elements. Such damage is a local phenomenon and is caused by thermomechanical fatigue (TMF). This paper presents a method designed for predicting the behavior of components subjected to variable temperature and mechanical loading conditions. This method combines the results of measurements of operating parameters of devices under industrial conditions with those obtained using finite element modeling (FEM). Particular attention was given to the influence of the time-dependent heat transfer coefficient on the local thermomechanical stress–strain behavior of the material. It was stated that heat transfer conditions have a significant impact on local transient stresses and depend on the operation parameters of boilers. Consistency of the temperature changes as a function of time, determined in industrial conditions and calculated on the basis of the model approach, was obtained. This developed and described in the work approach enables defining the conditions of heat transfer on the surface of models of considered components.

Keywords: power plants; heat transfer; thermal stresses; thermomechanical fatigue; stress–strain behavior (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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