Monitoring of thermal stresses in pressure components using inverse heat conduction methods. Issue 3 (6th March 2017)

• Record Type: Journal Article
• Authors: Taler, Jan; Weglowski, Bohdan; Pilarczyk, Marcin
• Is Part Of: International journal of numerical methods for heat & fluid flow. Volume 27:Issue 3(2017)
• Page Start: 740
• Page End: 756
• Publication Date: 2017-03-06
• Subjects: Thermal stress -- Inverse heat conduction method -- Monitoring method -- Steam boiler; Heat -- Transmission -- Mathematics -- Periodicals; Fluid dynamics -- Mathematics -- Periodicals; 536.2
• DOI: 10.1108/HFF-03-2016-0091
• Languages: English
• ISSNs: 0961-5539

Abstract

Abstract : Purpose: The purpose of this paper is to present a method for monitoring transient thermal stresses. This paper also presents the analysis of thermal stresses of boiler pressure element heating during the start-up in real conditions. The inverse methods are used to determine the wall temperature, whereas the commercial software ANSYS is used to determine the thermal stresses in the pressure component. Design/methodology/approach: The method is based on the solution of the inverse heat conduction problem. Thermal stresses are determined indirectly taking into account the measured temperature values at selected points on the outer wall of a pressure component. First, the transient temperature distribution in the entire pressure element is calculated, and then, thermal stresses are determined by the finite element method. Measured pressure changes are used to determine the stresses resultant from the internal pressure. Findings: The obtained stresses and temperature in the thick-walled pipe are illustrated and compared with experimental data. Satisfactory agreement was found between computational and experimental results. Originality/value: The method can be used in the monitoring of thermal and mechanical stresses during the boiler's start-up and shut-down. Because the temperature distribution at each time level is determined, it can be applied as a thermal load during the structural analysis.