Simplified approach for creep evaluation in superheaters

This paper is focused on the estimation of temperature distribution on superheater tube bundles for the consequent creep damage evaluation. The precision of estimated temperatures is very important because it significantly affects residual creep life. Conditions in the tube bundle can be simulated u...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2020-02, Vol.776 (1), p.12044
Main Authors: Naď, M, Lošák, P, Létal, T, Pernica, M
Format: Article
Language:English
Subjects:
Combustion chambers
Computational fluid dynamics
Creep life
Damage assessment
Flue gas
Gas flow
Inlet flow
Simulation
Superheaters
Temperature
Temperature distribution
Temperature gradients
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Summary:This paper is focused on the estimation of temperature distribution on superheater tube bundles for the consequent creep damage evaluation. The precision of estimated temperatures is very important because it significantly affects residual creep life. Conditions in the tube bundle can be simulated using CFD, however, a full 3D simulation would be computationally intensive and not fit for practical use. In order to mitigate this issue, the new approach considered in this paper uses a series of 2D CFD simulations in multiple sections using known inlet flow conditions. Those conditions have been investigated in previous work using 3D CFD simulation of flue gas flow starting in the combustion chamber and ending just before the superheater in the second pass. The paper also deals with possible temperature differences that may arise due to simplifications in the proposed approach. Lastly, the residual creep life is estimated using obtained temperature distribution on the tube bundle.
ISSN:1757-8981
1757-899X
DOI:10.1088/1757-899X/776/1/012044