Chair of automation of production processes, National Metallurgical Academy of Ukraine (Dnepropetrovsk, Ukraine):

Beitsun S. V., Cand. Eng., Ass. Prof.
Mikhailovskiy N. V., Cand. Eng., Ass. Prof.
Shibakinskiy V. I., Cand. Eng., Ass. Prof.

E-mail (common): kapp@ua.fm

The main factor limiting the duration of technological operations with steel ladles is reducing of the melt temperature. To create the automatic control system (ACS) for ladle steel treatment, it is necessary to predict promptly the dynamical thermal state of ladles during manufacturing operations. The mathematical model for nonstationary heat transfer through the multilayer lining has been developed; it allows to calculate heat losses through the walls and bottom of the ladle, as well as heat losses by radiation from the melt surface. The study has been undertaken on 120 t steel ladle with external diameter 3.6 m and height 4.3 m. Initial melt temperature in this ladle made in average 1620 ºC just after pouring, while initial temperature of internal lining surface in the prepared ladle made 1200 ºC. Environment temperature has been evaluated as 20 ºC. Computer implemen ted model, consisting of three subsystems calculating heat release from the melt surface and heat transfer through the wall and bottom of the ladle, has been developed. Standard deviation between obtained results and simulation data for the melt temperature after melt cooling in the ladle was as much as 3.3 ºC. Relationship between lowe ring of the melt temperature, poured in a ladle and time of its cooling has been revealed during the investigation. Results of the study are useful for saving energy during preparation of steel ladles.

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