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2 2019

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The impact of temperature oscillations and heat transfer conditions in thick-walled elbows and tubes on the local stress-strain behaviour during the fast start-up of power boilers

Okrajni Jerzy, Wacławiak Krzysztof

Engineering Transactions

2019

Vol. 67, iss. 4

579--591

The paper presents results of tests designed for predicting the behaviour of components subjected to variable temperature and mechanical loading conditions. Elbows and tubes, as examples of components widely used in power plant pipelines, have been examined. This analysis includes a description of model characteristics, the operating parameters of devices under industrial conditions, and the results of computational modelling (FEM).

Transient heat transfer as a leading factor in fatigue of thick-walled elements at power plants

Wacławiak Krzysztof, Okrajni Jerzy

Archives of Thermodynamics

2019

Vol. 40, no. 3

43--55

The authors present a numerical study of a start-up of a boiler with a thick-walled element subjected to thermomechanical loading. The significance of calculations of real heat transfer coefficients has been demonstrated. Fluid dynamics, mechanical transient thermal and static structural calculations have been conducted in both separate and coupled modes. Strain-stress analyses prove that the effect of the heat transfer coefficient changing in time and place in comparison with a constant one as recommended by standards is the key factor of fatigue calculations.