The Slab Continuous Casting Mold Simulation Analysis And Design Research

Continuous casting mold is the core equipment of slab continuous machine, known as the "heart" of continuous casting machine, its effect on the quality of the slab and the control of steel liquid is inestimable. The flow field distribution of steel liquid in the mold and the temperature field distribution of copper plate have important influence on the solidification heat transfer of liquid steel, the melt of casting powder, inclusions floatation and many internal and external defects of slab such as triangular crack, center crack, corner crack and surface defect. The reasonable copper plate structure of the mold can improve the cooling effect and extend the service life. Therefore, it is necessary to study the flow field of steel liquid, temperature field of copper plate and the copper plate structure in the mold.The article studied the wide and thick slab continuous casting mold of Han Dan steel, combined with the actual production process parameters of the third steel mill of Han Dan steel. The flow field of steel liquid in mold, the temperature field of copper plate, the solidification heat transfer of steel liquid were numerical simulated based on FLUENT, at the same time the copper plate structure of mold was optimized design researched, concrete research content is as follows:(1) Analysed the performance of nozzle A with the special export structure used in the continuous casting machine of Han Dan steel; researched the effects of casting speed and nozzle submergence depth on the flow field in the mold. When the casting speed is larger, nozzle A should be replaced by parallel nozzle, when using nozzle A, with a lower casting speed, the submergence depth should also be appropriately increased.(2) Based on the temperature measured by thermocouple, building the non-linear model of copper plate to estimate the heat flux, demonstrating the validity of model, confirming the heat flow formula of copper plate wide and narrow surface, analyzing the temperature distribution of copper plate. The temperature curve of copper plate hot side is of a wavy distribution, the temperature changes more gently; near the cold side has the largest temperature difference as 29.4℃. The temperature of copper plate decreases with the increase of the distance to the meniscus, but the temperature back to rise at the exit, about 23℃.(3) According to the simulation of slab section temperature nephogram and slab section liquid fraction figure, it is concluded that the shell thickness is 29.6 mm in the mold exit.(4) By changing the depth, number, width of the water channels of the wide and narrow copper plate in the mold, determining their respective different schemes, combining with numerical simulation. Analysed the cooling capacity of copper plate under the different scheme. To optimize the reasonable copper plate structure.