Publication detail
OPTIMIZATION OF SECONDARY COOLING IN ORDER TO ACHIEVE HIGHER SURFACE TEMPERATURES AT THE SLAB UNBENDING POINT
ŠTĚTINA, J. KAVIČKA, F. MAUDER, T. KLIMEŠ, L. MASARIK, M. ŠAŇA, Z.
Czech title
Optimalizace sekundárního chlazení pro dosažení vyšší teploty povrchu v místě rovnání
English title
OPTIMIZATION OF SECONDARY COOLING IN ORDER TO ACHIEVE HIGHER SURFACE TEMPERATURES AT THE SLAB UNBENDING POINT
Type
conference paper
Language
en
Original abstract
Surface temperatures of cast slabs at small radius segments in front of as well as at the unbending point belong to parameters that affect the surface quality of continuously cast slabs. Older machines for continuous casting were designed with regard to the performance (to amount of cast slabs) rather than to the quality. Therefore, the adaptation of secondary cooling is required in order to accomplish the desired surface temperatures. The modification consists in the dynamic control of secondary cooling, surface temperatures monitoring by means of the numerical model of temperature field as well as in a prospective replacement of cooling nozzles. In order to optimize and control the secondary cooling, characteristics of nozzles and especially the influences of water flow rate, air pressure, casting speed and surface temperatures to the heat transfer coefficient under nozzles have to be known. Moreover, the heat transfer coefficient can be also influenced by the age of nozzles. The paper deals with relationships of described influences and their impacts to the temperature field of cast slabs. The results are presented for the 1530x250 mm slabs that are cast in Evraz Vítkovice Steel where the main authors dynamic 3D solidification model is used to control the production interface and runs in off-line version. Its results can be used as a preparation tool for the real casting process.
Czech abstract
Povrchová teplota litinových desek na malý poloměr segmentů před, stejně jako v bodě neochvějný patří parametrů, které ovlivňují kvalitu povrchu plynule litých bram. Starší stroje pro kontinuální lití byly navrženy s ohledem na výkon (k výše litých desek), spíše než na kvalitu. Proto je adaptace sekundárního chlazení zapotřebí k dosažení požadované teploty povrchu. Úprava spočívá v dynamické kontroly sekundárního chlazení, povrchové teploty sledování pomocí numerického modelu teplotního pole, stejně jako v budoucím nahrazení chladicích trysek. S cílem optimalizovat a kontrolovat sekundární chlazení, charakteristika trysek a zejména vlivy průtoku vody, tlak vzduchu, rychlost kouzlení a povrchové teploty na součinitele prostupu tepla podle trysek musí být známy. Navíc, součinitel prostupu tepla je také ovlivněn věkem trysek. Práce se zabývá vztahy popsaných vlivů a jejich dopadů na teplotní oblasti litých desek. Výsledky jsou prezentovány na 1530 x 250 mm desek, které jsou odevzdaných v Evraz Vítkovice Steel, kde je hlavní autor dynamický 3D tuhnutí model použitý k řízení výroby rozhraní a běží v off-line verzi. Jeho výsledky mohou být použity jako nástroj pro přípravu skutečné lití.
English abstract
Surface temperatures of cast slabs at small radius segments in front of as well as at the unbending point belong to parameters that affect the surface quality of continuously cast slabs. Older machines for continuous casting were designed with regard to the performance (to amount of cast slabs) rather than to the quality. Therefore, the adaptation of secondary cooling is required in order to accomplish the desired surface temperatures. The modification consists in the dynamic control of secondary cooling, surface temperatures monitoring by means of the numerical model of temperature field as well as in a prospective replacement of cooling nozzles. In order to optimize and control the secondary cooling, characteristics of nozzles and especially the influences of water flow rate, air pressure, casting speed and surface temperatures to the heat transfer coefficient under nozzles have to be known. Moreover, the heat transfer coefficient can be also influenced by the age of nozzles. The paper deals with relationships of described influences and their impacts to the temperature field of cast slabs. The results are presented for the 1530x250 mm slabs that are cast in Evraz Vítkovice Steel where the main authors dynamic 3D solidification model is used to control the production interface and runs in off-line version. Its results can be used as a preparation tool for the real casting process.
Keywords in Czech
Optimalizace teplotního pole, teplota povrchu desky, charakteristiky trysek, kontilití
Keywords in English
optimization of temperature field, surface temperature of slab, characteristics of nozzles, continuous casting
RIV year
2012
Released
23.05.2012
Publisher
Tanger Ltd., Ostrava
Location
Ostrava
ISBN
978-80-87294-29-1
Book
Sborník příspěvků mezinárodní konference metalurgie a materiálů METAL 2012
Pages from–to
36–41
Pages count
6
BIBTEX
@inproceedings{BUT92677,
author="Josef {Štětina} and František {Kavička} and Tomáš {Mauder} and Lubomír {Klimeš} and Miloš {Masarik} and Zdeněk {Šaňa},
title="OPTIMIZATION OF SECONDARY COOLING IN ORDER TO ACHIEVE HIGHER SURFACE TEMPERATURES AT THE SLAB UNBENDING POINT",
booktitle="Sborník příspěvků mezinárodní konference metalurgie a materiálů METAL 2012",
year="2012",
month="May",
pages="36--41",
publisher="Tanger Ltd., Ostrava",
address="Ostrava",
isbn="978-80-87294-29-1"
}