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RESEARCH PAPERS

Analysis of Thermal Stresses in a Boiler Drum During Start-Up

[+] Author and Article Information
J. Taler, B. Węglowski, W. Zima, S. Grądziel, M. Zborowski

Cracow University of Technology, Institute of Process and Power Engineering, ul. Jana Pawła II 37, PL-31-864 Kraków, Poland

J. Pressure Vessel Technol 121(1), 84-93 (Feb 01, 1999) (10 pages) doi:10.1115/1.2883672 History: Received February 27, 1997; Revised September 16, 1998; Online February 11, 2008

Abstract

The paper presents an analytical way of calculating thermal stress distributions in cylindrical vessels, nonuniformly heated on their circumference. In thick-walled vessel elements, simplified analytical formulas do not give satisfactory results. A new method for determining thermal stresses has been developed. On the basis of temperature history measurements at several points on the drum outer surface, a time-space temperature distribution in the component cross section is determined, and next, thermal stresses are calculated using the finite element method (FEM). The new method, proposed for the solution of the inverse heat conduction problem, is sufficiently accurate. Knowledge of the boundary conditions on the inner surface of the drum, i.e., fluid temperature and heat transfer coefficient, is not necessary because the transient temperature distribution in the component is obtained from the solution of the inverse heat conduction problem. Comparison of the thermal distributions from FEM versus the new method demonstrate the accuracy of the new method. An example application of the new method demonstrates its benefits over the solution of the boundary-initial problem obtained by FEM.

Copyright © 1999 by The American Society of Mechanical Engineers
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