Monitoring of transient temperature and thermal stresses in pressure components of steam boilers

• Published in: The International journal of pressure vessels and piping 1997-08, Vol.72 (3), p.231-241
• Main Authors: Taler, Jan, Wȩglowski, Bohdan, Zima, Wiesław, Gra̧dziel, Sławomir, Zborowski, Marcin
• Format: Article
• Language: English
• Subjects: Applied sciences; Boilers; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Finite element method; Heat conduction; Heat transfer coefficients; Industrial metrology. Testing; Installations for energy generation and conversion: thermal and electrical energy; Installations for industrial steam generation; Inverse problems; Mechanical engineering. Machine design; Problem solving; Steel design; Steel tanks and pressure vessels; boiler manufacturing; Stress analysis; Temperature distribution; Thermal stress
• ISSN: 0308-0161; 1879-3541
• DOI: 10.1016/S0308-0161(97)00052-5

Two methods of solving the transient inverse heat conduction problens in complex shaped elements are presented in this paper. The time-space temperature distribution in whole element cross-section is reconstructed using the measured temperature histories at several points placed inside the element or on its easily accessible outer surface. Thermal stresses are then evaluated involving Finite Element Analysis. In both methods the heat transfer coefficient at the element inner surface is the unknown value. Four examples are presented, two for one method showing the high accuracy of the presented methods and possibility of their practical application.