Mathematical Heat Transfer and Dynamic Control Method for the Secondary Cooling in Bloom Casting

摘要

The dynamic control model for the secondary cooling of bloom caster, based on the heat transmission theory, is developed. Temperature distribution and solidifying phase can be monitored real time in the secondary cooling zone. The bloom caster is supplied as specimens in Capital Iron & Steel Group Company, and influences of casting speed on the surface temperature and shell thickness have been analyzed. In the meantime, it is discussed that the influence of different control modes on the surface temperature of succeeding cooling loops is variant when water supply of the certain loop has fluctuated. In view of the mutual relationships between different cooling loops and different production conditions, simulation experiments show that the model is beneficial to the stabilization of the surface temperature and improvement on bloom quality. There is great theoretical and practical significance when the control method can be applied in modernization of domestic continuous caster project and development of new continuous caster.