An analysis of a reheater failure and a proposal to upgrade the device design / Piotr Duda, Łukasz Felkowski, Adam Zieliński, Andrzej Duda // Energies [Dokument elektroniczny]. – 2019, Vol. 12, Iss. ... więcej

An analysis of a reheater failure and a proposal to upgrade the device design / Piotr Duda, Łukasz Felkowski, Adam Zieliński, Andrzej Duda // Energies [Dokument elektroniczny]. – 2019, Vol. 12, Iss. 12, 10 s. : rys., tab., wykr. – Tryb dostępu: https://www.mdpi.com/1996-1073/12/12/2255. – Bibliogr. 18 poz., Abstr. – doi: 10.3390/en12122255. – ISSN 1996-1073

The aim of this paper is to present an example of damage to the reheater tubes and conduct the material and numerical analyses to establish the cause of the device failure. Cracks were observed on the ... więcej

The aim of this paper is to present an example of damage to the reheater tubes and conduct the material and numerical analyses to establish the cause of the device failure. Cracks were observed on the first, second, and third tube row. Close to the damaged area, a ferritic structure could be observed with highly degraded bainite areas, characterized by coagulation and coalescence of precipitates. The cause of the damage was analysed using the finite element method (FEM). The big yield of the tube cross-section confirmed that the tube may get damaged during subsequent cycles of the boiler operation, which was also proved by the microstructure testing results. For the reheater under analysis, the tubes have to be lengthened to achieve a reduction in stresses, arising due to thermal loads to values lower than allowable stresses according to Standard EN 13480-3. The modelling results confirmed the correct operation for the upgraded system.
The aim of this paper is to present an example of damage to the reheater tubes and conduct the numerical analyses to establish the cause of the device failure. Cracks were observed on the first, second and third tube row. Failure analysic of mechanical structures can be clasified in scientific discipline of Mechanical Engineering.