From a heat transfer point of view, to improve the heat transfer between the spray water droplets and the slab in the secondary cooling zone is to increase the water flow density and quickly take away the heat from the surface of the slab; from a metallurgical quality point of view, the secondary cooling zone The amount and distribution of water directly affect the quality of the slab. Therefore, the appropriate secondary cooling system should be selected based on comprehensive considerations of heat transfer and metallurgical quality. According to the solidification heat transfer principle of the cast slab in the secondary cooling zone, it can be derived: where W – the cooling water volume in the secondary cooling zone, L/min; H – the length of the liquid cavity, m; V – the pulling speed, m/min. The above formula shows that when the pulling speed is constant, the amount of water sprayed on the surface of the slab in the secondary cooling zone gradually decreases from top to bottom along the height of the vacuum casting machine. This is the basic principle of water distribution. It is difficult to control the amount of water to continuously decrease from top to bottom, but it is also necessary to keep the surface temperature of the slab in the secondary cooling zone from fluctuating too much. Therefore, the secondary cooling zone of the continuous lost foam casting machine is divided into There are several cooling sections, such as 5 to 7 cooling sections for the slab, and the same cooling water volume is maintained in one cooling section, and the surface temperature of the slab does not change much.
Link to this article：Principles for formulating secondary cooling system for continuous casting
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