Publication detail
Damage of the boiler collector caused by vibration
BUZÍK, J.
Czech title
Poškození kolektoru kotle vibracemi
English title
Damage of the boiler collector caused by vibration
Type
conference paper
Language
en
Original abstract
This contribution is devoted to searching of the damage causes to the boiler collector, which is periodically damaged between nozzles of collector. Thus, the place between the boiler nozzles was analysed by FEM (finite element method) which showed the damage is not caused by static (respectively quasi-static) strain. Based on these results, CFD (computational fluid dynamics) analyses was performed on the tube bundle. This analyses revealed formation of vortex excitations behind the tubes. In the process of formation of these cracks are involved more together linked factors. This contribution is devoted to find importance of the tube bundle support on the cracks formation. It is expected that the formation of these cracks is caused by vortex excitations. These vortex excitations may lead to tube vibration. Real cracks on the collector is forms with period 4 to 5 years and frequency of vortex excitation is circa 7 to 20 Hz.
Czech abstract
Tento příspěvek je věnován hledání příčin poškození kolektoru kotle, které se periodicky vyskytují mezi hrdli kolektoru. Toto místo bylo analyzováno pomocí MKP (metoda konečných prvků). Analýza ukázala, že poškození není způsobeno statickým (respektive kvazi-statické) zatížením. Na základě těchto výsledků byla provedena CFD (Computational Fluid Dynamics) analýza na svazku trubek. CFD analýzy ukázaly výskyt vírového buzení mezi trubekami. Toto vírové buzení může způsobovat rozkmitávání geometrie svazku trubek, což povede ke kumulaci napětí v místech geometrie se sníženými stupni volnosti. Na procesu tvorby těchto trhlin se podílí více spolu souvisejících faktorů. Tento příspěvek je věnován vlivu geometrie podpěr trubkového svazku na tvorbu trhlin. Předpokládá se, že tvorba těchto trhlin je způsobena vírovým buzením. Reálné praskliny na kolektoru tvoří s obdobím 4-5roky a četnost vír buzení je cca 7-20 Hz.
English abstract
This contribution is devoted to searching of the damage causes to the boiler collector, which is periodically damaged between nozzles of collector. Thus, the place between the boiler nozzles was analysed by FEM (finite element method) which showed the damage is not caused by static (respectively quasi-static) strain. Based on these results, CFD (computational fluid dynamics) analyses was performed on the tube bundle. This analyses revealed formation of vortex excitations behind the tubes. In the process of formation of these cracks are involved more together linked factors. This contribution is devoted to find importance of the tube bundle support on the cracks formation. It is expected that the formation of these cracks is caused by vortex excitations. These vortex excitations may lead to tube vibration. Real cracks on the collector is forms with period 4 to 5 years and frequency of vortex excitation is circa 7 to 20 Hz.
Keywords in Czech
fluid induced vibration, vortex excitation, boiler
Keywords in English
fluid induced vibration, vortex excitation, boiler
RIV year
2014
Released
04.11.2014
Publisher
University of West Bohemia
Location
Plzeň
ISBN
978-80-261-0429-2
Book
Book of extended abstracts 30th conference with international participation Computational Mechanics 2014
Pages from–to
11–12
Pages count
2
BIBTEX
@inproceedings{BUT113299,
author="Jiří {Buzík},
title="Damage of the boiler collector caused by vibration",
booktitle="Book of extended abstracts 30th conference with international participation Computational Mechanics 2014",
year="2014",
month="November",
pages="11--12",
publisher="University of West Bohemia",
address="Plzeň",
isbn="978-80-261-0429-2"
}