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"
}