Publication detail
An Optimal Relationship Between Casting Speed and Heat Transfer Coefficients for Continuous Casting Process
MAUDER, T. ŠTĚTINA, J. ŠANDERA, Č. KAVIČKA, F. MASARIK, M.
Czech title
Optimální vztah mezi licí rychlostí a koeficienty přestupu tepla pro plynulé odlévání oceli
English title
An Optimal Relationship Between Casting Speed and Heat Transfer Coefficients for Continuous Casting Process
Type
conference paper
Language
en
Original abstract
The quality of steel slabs produced by continuous casting is influenced by various factors. Casting speed, cooling rates and the temperature distribution, particularly on the surface of casted product are factors with very strong impacts to the process and therefore, we focus on a determination of their optimal relationship. More precisely, this paper investigates how the optimal cooling depends on the chosen speed of casting. For finding this relationship we built our original 2D numerical model of the continuous casting process and by its optimization we acquire the cooling for producing the steel slabs with optimal quality. The numerical model is based on enthalpy approach, which can simulate phase and structural changes for steel of arbitrary chemical composition, and the cooling is included in boundary conditions in the form of heat transfer coefficients. The optimal heat transfer coefficients are obtained by a modern heuristic optimization algorithm, called Firefly algorithm. By repeated fixing of casting speed in the model to different values and finding its associated optimal cooling, we receive the investigated relationship. The future work is defining cooling rates as a function of heat transfer coefficients and surface temperature.
Czech abstract
Kvalita oceli odlité při plynulém odlévání je závislá na mnohých parametrech. Licí rychlost, chladící průtoky a rozložení teplot na povrchu odlitku jsou faktory, které mají zásadní vliv na celý proces, a proto se zaměřujeme na jejich vzájemný optimální vztah. Konkrétně se článek zaměřuje na hledání optimální závislosti chlazení na zvolené licí rychlosti. Pro hledání tohoto vztahu byl vytvořen původní 2D numerický model zařízení pro plynulé odlévání a jeho optimalizací získáváme nastavení chlazení pro zvýšení kvality předlitku. Numerický model je založen na přístupu entalpie, který zahrnuje fázové a strukturální změny pro ocel určenou jejím chemickým složením. Chlazení je obsaženo v okrajových podmínkách v koeficientech přestupu tepla. Optimální hodnota koeficientů přestupu tepla je obdržena moderním heuristickým optimalizačním algoritmem, tzv. Firefly algoritmem. Opakovaným výpočtem pro pevně dané licí rychlosti a hledáním korespondujícího chlazení, obdržíme hledaný vztah. Budoucí směr práce se zaměří na určení chladících průtoků jako funkci koeficientů přestupu tepla a povrchové teploty.
English abstract
The quality of steel slabs produced by continuous casting is influenced by various factors. Casting speed, cooling rates and the temperature distribution, particularly on the surface of casted product are factors with very strong impacts to the process and therefore, we focus on a determination of their optimal relationship. More precisely, this paper investigates how the optimal cooling depends on the chosen speed of casting. For finding this relationship we built our original 2D numerical model of the continuous casting process and by its optimization we acquire the cooling for producing the steel slabs with optimal quality. The numerical model is based on enthalpy approach, which can simulate phase and structural changes for steel of arbitrary chemical composition, and the cooling is included in boundary conditions in the form of heat transfer coefficients. The optimal heat transfer coefficients are obtained by a modern heuristic optimization algorithm, called Firefly algorithm. By repeated fixing of casting speed in the model to different values and finding its associated optimal cooling, we receive the investigated relationship. The future work is defining cooling rates as a function of heat transfer coefficients and surface temperature.
Keywords in Czech
Plynulé odlévání oceli, heuristická optimalizace
Keywords in English
Continuous casting process, heuristic optimization, secondary cooling
RIV year
2011
Released
18.05.2011
Publisher
Tanger
Location
Ostrava
ISBN
978-80-87294-24-6
Book
METAL 2011 Conference proceedings
Pages from–to
42–48
Pages count
7
BIBTEX
@inproceedings{BUT92149,
author="Tomáš {Mauder} and Josef {Štětina} and Čeněk {Šandera} and František {Kavička} and Miloš {Masarik},
title="An Optimal Relationship Between Casting Speed and Heat Transfer Coefficients for Continuous Casting Process",
booktitle="METAL 2011 Conference proceedings",
year="2011",
month="May",
pages="42--48",
publisher="Tanger",
address="Ostrava",
isbn="978-80-87294-24-6"
}