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A numerical model of transient pipeline operation

Taler D., Kaczmarski K.

Czasopismo Techniczne. Mechanika

2016

Y. 113, iss. 1-M

231--242

The aim of this study is to develop a numerical model of a steam pipeline. The energy conservation equations for the pipeline wall and steam are solved using the finite volume method (FVM). The transient temperature of the pipeline wall, steam temperature and thermal stresses can be calculated using the model developed in the paper.

Celem artykułu jest opracowanie modelu numerycznego rurociągu parowego. Równania zachowania energii dla ścianki rurociągu i pary są rozwiązywane przy użyciu metody objętości skończonych (MOS). Nieustalona temperatura ścianki rurociągu, temperatura pary oraz naprężenia cieplne mogą być obliczone za pomocą modelu przedstawionego w artykule.

Determination of temperature and thermal stresses distribution in power boiler elements with use inverse heat conduction method

Grądziel S.

Archives of Thermodynamics

2011

Vol. 32, no. 3

191-200

The following paper presents the method for solving one-dimensional inverse boundary heat conduction problems. The method is used to estimate the unknown thermal boundary condition on inner surface of a thick-walled Y-branch. Solution is based on measured temperature transients at two points inside the element's wall thickness. Y-branch is installed in a fresh steam pipeline in a power plant in Poland. Determination of an unknown boundary condition allows for the calculation of transient temperature distribution in the whole element. Next, stresses caused by non-uniform transient temperature distribution and by steam pressure inside a Y-branch are calculated using the finite element method. The proposed algorithm can be used for thermal-strength state monitoring in similar elements, when it is not possible to determine a 3-D thermal boundary condition. The calculated temperature and stress transients can be used for the calculation of element durability. More accurate temperature and stress monitoring will contribute to a substantial decrease of maximal stresses that occur during transient start-up and shut-down processes.