Blowing and refining device and method used for removing tundish molten steel inclusion

A technology of refining device and air blowing device, which is applied in the field of improving the flow of molten steel in the tundish and protecting molten steel from oxidation, and can solve the problems of secondary oxidation of molten steel, limited ability to capture and remove inclusions, etc., to avoid The effect of secondary oxidation and slag entrainment, prolonging the average residence time, and improving the flow behavior of molten steel

CN102764868BActive Publication Date: 2015-01-07UNIV OF SCI & TECH BEIJING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-01-07

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Abstract

The invention discloses a blowing and refining device and method used for removing the tundish molten steel inclusion. The blowing and refining device is characterized by comprising a tundish 1, a blowing device 2 and a dipping cover 3, wherein the tundish comprises a permanent layer and a working layer arranged on the inner surface of the permanent layer; the bottom of the permanent layer is provided with the blowing device; the blowing device comprises an air brick and a ventilating pipe; the air brick comprises a dense layer and a ventilating layer; the middle of the ventilating layer is provided with an air chamber; and the dipping cover is a refractory material cover supported by a steel plate, is connected with an automatic lifting system and is arranged above the blowing device. According to the blowing and refining device, an air curtain retaining wall with a big air flow can be introduced in to form continuous and tight bubble columns, the average residence time of molten steel in the tundish is obviously prolonged, the molten steel flowing behavior is obviously improved, the molten steel can be stirred by a great quantity of tiny bubbles, inclusions with a smaller size can be adsorbed, and meanwhile, steel slag rolling and mixing and the secondary oxidation of the molten steel due to big blowing amount can be avoided.
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Description

technical field

[0001] The invention belongs to the technical field of iron and steel metallurgy tundish continuous casting, and in particular provides a method and a device for improving the flow of molten steel in the tundish and protecting the molten steel from oxidation. Background technique

[0002] The continuous casting tundish is the last refractory container before the molten steel solidifies. It has developed from the initial functions of diversion, continuous casting and decompression to a refining equipment with the functions of removing inclusions and heating. Therefore, the inclusions in molten steel should be removed to the greatest extent and foreign inclusions should be avoided as much as possible. Controlling the flow behavior of molten steel in the tundish is an important way to achieve effective removal of inclusions.

[0003] A large number of studies have shown that traditional flow control devices can only effectively remove inclusions larger than 50 ...

Examples

Embodiment Construction

[0019] Such as figure 1 As shown, the overall structure diagram of the tundish gas blowing refining device of the present invention, the gas blowing refining device suitable for removing tundish molten steel inclusions in the present invention includes a tundish 1, a gas blowing device 2 and an impregnation cover 3, the tundish It includes a permanent layer 5 and a working layer 6 arranged on the inner surface of the permanent layer. The bottom of the permanent layer is provided with an air blowing device 2. The air blowing device includes a ventilation brick 11 and a ventilation pipe 10. The ventilation brick includes a dense Layer 7 and air-permeable layer 8. There is an air chamber 9 in the middle of the air-permeable layer. External air is blown into the air chamber through the air pipe. The impregnation cover 3 is a refractory material cover supported by a steel plate. It is composed of the immersion part 13, is provided with an exhaust hole 15, is connected with the auto...