A Flow Control Structure for Suppressing Slag Dropping in Tundish

Abstract

The invention discloses a flow control structure for suppressing tundish slag, which comprises an inflow plate, a stopper rod and an outflow channel, the top of the inflow plate is provided with a stopper rod hole, and the stopper rod is installed in the stopper rod hole , there is a hollow chamber inside the inflow plate, and an outflow channel at the bottom. The hollow chamber communicates with the outflow channel. In the nozzle, the side wall of the inflow plate is provided with several inflow holes at equal intervals in the circumferential direction, the inflow holes communicate with the hollow chamber and the outflow channel, and the upper part of the hollow chamber is provided with several winding inflow disks The central axis is uniformly distributed and directed towards the same swirl-suppressing guide vanes. The invention can effectively suppress the behavior of slag sucking air under converging vortex at the upper part of the nozzle in the final tapping stage of the tundish, and obviously improve the metal yield on the premise of ensuring the purity of molten steel.

Description

technical field [0001] The invention relates to the technical fields of iron and steel metallurgy and continuous casting, in particular to a flow control structure for suppressing slag in a tundish. Background technique [0002] Tundish metallurgy generally has two operations: steady state and unsteady state pouring, in which the steady state occupies more than 90% of the tundish metallurgy time, the liquid level of the tundish remains unchanged throughout the process, and the position of the stopper basically remains unchanged. Unsteady pouring includes operations such as opening, changing ladles, and stopping pouring. More than 90% of unstable factors and quality defects of molten steel in the tundish are caused by unsteady operations. When the pouring is stopped or the bag is changed abnormally, as the molten steel level drops, a rapidly rotating confluence vortex will be formed. Once it penetrates, it will easily cause slag entrainment and air suction. The slag caused by...

AI Technical Summary

Problems solved by technology

At present, the main technologies are: (1) floating valve: a thick slag layer is required, the movement of the valve body is difficult to control, and it is easily eroded by molten steel, and impurities are introduced

(2) Electromagnetic device: This technology has not been widely used due to the restriction of high temperature environment and the difficulty of device layout, and it is difficult to implement cold test

(3) Air blowing interference: a large amount of air blowing is required, which may easily cause the increase of slag volume, molten steel exposed area and temperature drop, and the inclusion structure needs to be changed

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