Identification of thermal and strength phenomena in power installations

Abstract

Abstract The aim of this work is to show the inverse method, which can be used to determine the transient stress distribution caused by pressure and a variable temperature field. The method is fast enough to be used online in systems monitoring the thermal and strength condition of selected elements. The solution is possible despite the lack of information about the thermal boundary condition on the inner surface of the tank. The lack of data on the phenomena occurring inside the collector may be caused by the inability to install measuring sensors. Computational Fluid Dynamics (CFD) can take a long time to analyze complex phenomena on the inner surface of a collector, making it difficult to apply the method online. Solving the inverse problem is possible thanks to the measured temperature transients at selected points inside or on the outside of the component. After identifying the temperature distribution, stresses are determined using the finite element method. Then the maximum stresses can be compared with the permissible values, which allows the assessment of the operational safety of the element.