Publication detail
Numerical Analysis of Heat Transfer in Radiant Section of Fired Heater with Realistic Imperfect Geometry of Tube Coil
JEGLA, Z. HÁJEK, J. VONDÁL, J.
Czech title
Numericá analýza přenosu tepla v radiační sekci procesní pece s realistickou nedokonalou geometrií trubkového svazku
English title
Numerical Analysis of Heat Transfer in Radiant Section of Fired Heater with Realistic Imperfect Geometry of Tube Coil
Type
conference paper
Language
en
Original abstract
Complex numerical computations are performed for vertical cylindrical fired heater operated in crude oil atmospheric distillation unit to analyse the distribution of heat flux on the tubes of radiant section. The numerical model describes flow, gas combustion and radiative heat transfer inside the radiation section of the fired heater. Analysis of variations of heat flux on circumferential and longitudinal distribution on individual tube walls is executed comparing case of ideal (originally designed) tube coil geometry and tube coil containing typical real geometry imperfections (developed during years of operation). Results of heat transfer analysis confirm and quantify the significant effects of non-uniform heat flux distribution on individual radiant tubes negatively sharpened by geometry imperfections of tube coil. It is recognized, that fired heater design standards recommendations invoked in 1D design calculations of fired heaters are significantly underestimating real heat flux variability.
Czech abstract
Byly provedena komplexní analýza přenosu tepla v radiační sekci válcové procesní pece používané v jednotce pro atmosférickou destilaci ropy. Použitý numerický model popisoval proudění, spalování plynu a radiační přenos tepla do radiační sekce pece. Byla provedena analýza distribuce tepelného toku na površích jednotlivých trubek nedokonalého trubkového svazku a výsledky byly porovnány s původním – idealizovaným – návrhem trubkového svazku. Získané výsledky ukázaly, že vliv nerovnoměrné distribuce tepelného toku v rámci svazku je dále zhoršen geometrickými nedokonalostmi trubek. Dále bylo potvrzeno, že standardní 1D metoda návrhu svazku značně podhodnocuje vliv nerovnoměrnosti tepelného toku.
English abstract
Complex numerical computations are performed for vertical cylindrical fired heater operated in crude oil atmospheric distillation unit to analyse the distribution of heat flux on the tubes of radiant section. The numerical model describes flow, gas combustion and radiative heat transfer inside the radiation section of the fired heater. Analysis of variations of heat flux on circumferential and longitudinal distribution on individual tube walls is executed comparing case of ideal (originally designed) tube coil geometry and tube coil containing typical real geometry imperfections (developed during years of operation). Results of heat transfer analysis confirm and quantify the significant effects of non-uniform heat flux distribution on individual radiant tubes negatively sharpened by geometry imperfections of tube coil. It is recognized, that fired heater design standards recommendations invoked in 1D design calculations of fired heaters are significantly underestimating real heat flux variability.
Keywords in Czech
procesní pec, numerická analýza, přenos tepla, radiační sekce
Keywords in English
fired heater, numerical analysis, heat transfer, radiant section
RIV year
2014
Released
23.08.2014
Publisher
Aidic Servizi S.r.l.
Location
Milan, Italy
ISBN
978-88-95608-30-3
ISSN
2283-9216
Book
Proceedings of the 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction PRES 2014
Volume
39
Pages from–to
889–894
Pages count
6
BIBTEX
@inproceedings{BUT109158,
author="Zdeněk {Jegla} and Jiří {Hájek} and Jiří {Vondál},
title="Numerical Analysis of Heat Transfer in Radiant Section of Fired Heater with Realistic Imperfect Geometry of Tube Coil",
booktitle="Proceedings of the 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction PRES 2014",
year="2014",
volume="39",
month="August",
pages="889--894",
publisher="Aidic Servizi S.r.l.",
address="Milan, Italy",
isbn="978-88-95608-30-3",
issn="2283-9216"
}