SISTEMA DE MONITORAMENTO E OTIMIZAÇÃO DO DESGASTE DOS TUBOS SUBMERSOS DE MÁQUINAS DE LINGOTAMENTO CONTÍNUO EM TEMPO REAL
REAL-TIME MONITORING AND WEAR OPTIMIZATION SYSTEM OF SUBMERGED ENTRY NOZZLES OF CONTINUOUS CASTING MACHINES
Ramstorfer, Franz; Silva, Charlie Denis Cordeiro; Nunes, Antonio Eli; Guzela, Danilo Di Napoli
http://dx.doi.org/10.4322/tmm.2014.030
Tecnol. Metal. Mater. Min., vol.11, n3, p.202-209, 2014
Resumo
Este trabalho aborda o desenvolvimento de um sistema de monitoramento e de um algoritmo de otimização em tempo real do desgaste dos tubos submersos de máquinas de lingotamento contínuo. O sistema de monitoramento foi desenvolvido para informar, em tempo real, ao operador do molde sobre o estado do desgaste durante o lingotamento para evitar primeiramente o risco da utilização excessiva e consequente quebra do tubo. Este tipo de incidente implica sempre em um risco considerável para os operadores que trabalham removendo as partes quebradas no interior do molde, no sentido de evitar o risco de rompimento de veio devido a um aprisionamento de material não metálico junto à frente de solidificação. Os parâmetros do modelo matemático foram ajustados medindo-se o desgaste de uma série de exemplares de tubos utilizados pelo processo. Além disso, um algoritmo de otimização do desgaste foi desenvolvido para controlar a profundidade de imersão do tubo submerso. Com a implementação desses dois sistemas, não só o tempo de utilização dos tubos submersos pode ser melhorado, mas também, a segurança dos operadores e do processo.
Palavras-chave
Lingotamento contínuo, Tubos submersos, Monitoramento de desgaste em tempo real, Otimização de desgaste.
Abstract
The present work is focused on the development of a real-time monitoring system and an optimization algorithm of the wear of submerged entry nozzles (SEN) of continuous slab casters. The real-time monitoring system was developed in order to inform the operator about the actual state of SEN wear during casting in order to avoid primarily the risk of an excessive use and a breakage of the SEN. This kind of incident always entails a considerable danger for the operators while removing the broken parts out of the mould and a risk of a breakout due to an entrapment of refractory parts in the strand too. The parameters of the mathematical model were adjusted by collecting process data and measuring the wear of various nozzles utilized at different casting conditions. Additionally, a wear optimization algorithm was developed for controlling the immersion depth of the SEN in order to maximize the usage time even it was already used at a constant immersion depth for some time. With the implementation of these two systems, not only the usage time of the submerged entry nozzles could be enhanced significantly, but also, at the same time, the operator and process safety.
Keywords
Continuous slab casting, Submerged entry nozzles, Real-time wear monitoring, Wear optimization.
Referências
1. Mukai K, Toguri JM, Stubina NM, Yoshitomi J. A mechanism for the local corrosion of immersion nozzles. Journal of the Iron and Steel Institute of Japan. 1989;29(6):469-476. http://dx.doi.org/10.2355/isijinternational.29.469
2. Dick AF, Yu X, Pomfret RJ, Coley KS. Attack of submerged entry nozzles by mould flux and dissolution of refractory oxides in the flux. Journal of the Iron and Steel Institute of Japan. 1997;37(2):102-108. http://dx.doi.org/10.2355/ isijinternational.37.102
3. Nakamura Y, Ando T, Kurata K, Ikeda M. Effect of chemical composition of mold powder on the erosion of submerged nozzles for continuous casting of steel. Transactions of the Iron and Steel Institute of Japan. 1986;26(12):1052-1058. http://dx.doi.org/10.2355/isijinternational1966.26.1052
4. Bruce DW, Hunter NS. Utilization of mould thermal monitoring for improvement of bloom surface quality on the british steel, teesside works 8-strand bloom caster. In: German Iron and Steel Institute. Proceedings of the 2nd European Continuous Casting Conference; 1994 June 20-22; Düsseldorf, Alemanha. Düsseldorf: VDEh; 1994. p. 156-161.
5. Höffken E, Lax H, Pietzko G. Development of improved immersion nozzles for continuous slab casting. In: Centre de Recherches Métallurgiques, German Iron and Steel Institute. Proceedings of the 4th International Conference on Continuous Casting; 1988 May 17-19; Bruxelas, Bélgica. Bruxelas: Stahl Eisen; 1988. v. 2, p. 461-473.
6. Capurro C, Cicutti C, Galliano P, Fuhr F, Torga G, Walter G. Characterization of wear of submerged entry nozzles used in the continuous casting of steel. In: Instituto Argentino de Siderurgia. Proceedings of the 15th Steelmaking Conference; 2005 November 8-10; San Nicolas, Argentina. San Nicolas: IAS; 2005. p. 591-601.
7. Capurro C, Cicutti C, Galliano P, Fuhr F, Torga G, Scoccia J. Optimization of submerged entry nozzles wearing. In: Associazione Italiana di Metallurgia. Proceedings of the 6th European Conference on Continuous Casting; 2008 June 3-6; Riccione, Itália. Riccione: AIM; 2008. p. 384-394.
Facebook
Google+
Twitter
LinkedIn
Mendeley
StumbleUpon
CiteULike
Reddit
Email