Analysis of the Cooling Modes of the Lining of a Ferroalloy-Casting Ladle

Evgeniy Prikhodko, Alexandr Nikiforov, Akmaral Kinzhibekova (), Nazgul Aripova, Amangeldy Karmanov and Vladimir Ryndin
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Evgeniy Prikhodko: Department of Heat Power Engineering, Toraighyrov University, 64 Lomov Str., Pavlodar 140000, Kazakhstan
Alexandr Nikiforov: Department of Heat Power Engineering, Toraighyrov University, 64 Lomov Str., Pavlodar 140000, Kazakhstan
Akmaral Kinzhibekova: Department of Heat Power Engineering, Toraighyrov University, 64 Lomov Str., Pavlodar 140000, Kazakhstan
Nazgul Aripova: Department of Heat Power Engineering, Toraighyrov University, 64 Lomov Str., Pavlodar 140000, Kazakhstan
Amangeldy Karmanov: Department of Heat Power Engineering, Toraighyrov University, 64 Lomov Str., Pavlodar 140000, Kazakhstan
Vladimir Ryndin: Department of Mechanics and Oil and Gas Engineering, Toraighyrov University, 64 Lomov Str., Pavlodar 140000, Kazakhstan

Energies, 2024, vol. 17, issue 5, 1-12

Abstract: An important element of the operation of high-temperature aggregates are modes that change over time. During these modes, maximum temperature changes are recorded in the cross-section of the lining of the aggregate. The difference in temperature leads to the formation of thermal stresses, which are the main reason for the repair of aggregates. During rapid heating, the inner layers of the lining are subjected to compressive stresses, while during rapid cooling, these layers experience tensile stresses. Under the same conditions, rapid cooling of the lining is more critical, since refractories have poor resistance to tension. The purpose of the study is to calculate and analyze the thermal stresses that arise during cooling of the casting ladle lining. The stresses are determined based on the calculation of the unsteady temperature field of the lining. Thermal stress values are necessary for analysis of the current cooling rates of casting ladles and subsequent development of optimal cooling modes for the lining. To solve the heat conductivity equation, a numerical method was chosen using an implicit four-point difference scheme. To study the cooling process of the casting ladle lining, temperature measurements were carried out in the zone of the greatest wear of the lining. Under conditions of natural convection, cooling of the casting ladle lining occurs unevenly. Cooling schedules during natural convection are characterized by significant unevenness and high rates of temperature decrease. The cooling rates of the inner surface of the lining at the initial stage of cooling significantly exceed the values recommended in the technical literature. Such cooling rates lead to the appearance of significant thermal stresses in the lining. For a refractory that has not been in service, the maximum thermal compressive stresses exceed the ultimate compressive strength by 1.27 times, and the tensile stresses exceed the corresponding limit values by 4.4 times. For refractories that have worked three fuses in the ladle lining, the maximum thermal compressive stresses exceed the ultimate compressive strength by 1.28 times, and the tensile stresses exceed the corresponding limit values by 3.19 times. The studied cooling modes for the casting ladle lining are unacceptable for operation. Cooling, taking into account the indicated rates, leads to the destruction of the lining material. To increase the resistance and duration of the working campaign of casting ladle linings, it is necessary to develop cooling modes for the lining at speeds at which the resulting thermal stresses do not exceed the strength of the refractory materials.

Keywords: ultimate strength of refractory materials; lining; high-temperature aggregates; thermal stresses; chamotte refractories (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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