CN201132206Y - Turbulence controller for horizontal continuous casting tundish - Google Patents

Abstract

A horizontal continuous casting tundish turbulence controller, which includes a body 1, the body 1 is a three-dimensional rectangle, a rectangular cavity 2 is arranged on the body 1, the opening of the rectangular cavity 2 is large, the bottom is small, and the rectangular cavity The four inner walls of the cavity 2 are circular arc surfaces. The turbulence controller is placed directly below the pouring position. Since the injection flow from the long nozzle of the ladle just hits the turbulence controller at the bottom of the ladle, the turbulent flow of the injection flow is restricted, which can increase the residence time of molten steel in the tundish and effectively reduce the flow rate of molten steel. The occurrence of splashing during pouring can reduce the erosion effect on refractory materials, and more importantly, reduce the oxygen absorption and gas absorption effect when molten steel is splashed and dispersed during pouring. Moreover, the injection flow slowly flows upwards along the inclination angle of the inner wall of the turbulence controller to the surface of the tundish liquid steel, and continuously mixes with the injection flow flowing down into the turbulence controller, and then flows upwards, creating a barrier for inclusions to collide, grow and float A good opportunity to overcome the shortcomings of the large dead zone caused by the deep liquid level in the horizontal continuous casting tundish.

Description

Turbulence controller for horizontal continuous casting tundish

technical field

The utility model relates to the field of iron and steel metallurgy, in particular to a novel horizontal continuous casting tundish liquid steel flow control device used in the technical field of horizontal continuous casting.

Background technique

The continuous casting tundish is used as a container for the transition of molten steel between the ladle and the crystallizer, and plays the role of stabilizing the steel flow, diverting and storing the molten steel for continuous casting. With the continuous development of continuous casting production and the continuous improvement of continuous casting technology, people use the tundish as the last refining method before the molten steel enters the crystallizer to solidify. The flow path of liquid is promoted to promote the growth and floating of inclusions, and strive to further reduce the content of inclusions in molten steel in the tundish.

The removal of inclusions in the tundish is mainly achieved by the fluid mixing in the injection impact zone of the ladle shroud, and the inclusions collide with each other and grow up to float up. At present, in the field of arc continuous casting, it is common to use a new type of flow control device in the tundish—the turbulence controller. However, the research work on metallurgical functions of the tundish in the field of horizontal continuous casting is relatively backward. There are very few reports.

The pouring position of the horizontal continuous casting tundish is located in the tundish working area, and the long nozzle flow is relatively close to the nozzle channel and the vertical surface of the tundish, and the molten steel injection has serious erosion and erosion on the tundish nozzle and the tundish wall. In addition, after the molten steel in the ladle flows out from the long nozzle and enters the tundish, it flows out of the tundish nozzle and enters the crystallizer before it is in a hurry to mix with the surrounding molten steel, and the inclusions in the steel do not have enough time to float up. Compared with arc continuous casting, horizontal continuous casting has a deeper tundish molten pool, and the floating distance of inclusions is longer. In addition, the capacity of tundish is smaller, so inclusions lack sufficient floating time. And because the horizontal continuous casting crystallizer is placed horizontally and is sealed and connected with the tundish, the molten steel inclusions entering the tundish from the ladle directly enter the casting slab without any chance of floating. In this way, the role of removing molten steel inclusions in the tundish is more significant for horizontal continuous casting.

Contents of the invention

The purpose of this utility model is to provide a turbulent flow controller for a horizontal continuous casting tundish. A turbulence controller is installed under the long nozzle of the inner ladle to reduce the splash of molten steel caused by the impact of the ladle injection flow when the ladle is opened or replaced, and to reduce the erosion of the tundish lining due to the erosion of the steel flow. Control the flow of molten steel in the tundish, change the flow field of molten steel in the tundish, make the flow of molten steel more reasonable, increase the residence time of molten steel in the tundish, facilitate the floating, separation and removal of inclusions, and improve the cleanliness of molten steel.

The technical solution of the utility model is: a horizontal continuous casting tundish turbulence controller, which includes a body, the body is a three-dimensional rectangle, a bottomed rectangular cavity is arranged on the body, the opening of the rectangular cavity is large, The bottom is small, and the four inner walls of the rectangular cavity are arc surfaces.

The horizontal continuous casting tundish turbulence controller is made of refractory material and is installed directly below the shroud, corresponding to the casting shroud. It is used to control the flow, mixing and retention of molten steel and promote the removal of inclusions.

Compared with the prior art, the utility model has the following characteristics:

The removal of inclusions in the tundish is mainly achieved by the mixing of molten steel in the injection impact zone of the long nozzle of the ladle, and the inclusions collide with each other, grow up and float. The injection flow of ladle long nozzle in the tundish without turbulence controller directly impacts on the impact brick at the bottom of the tundish, spreads along the bottom of the tundish, is splashed to the surroundings, and directly enters the crystallizer, which is not conducive to the floating of inclusions . In the tundish with a turbulence controller, the injection flow from the long nozzle of the ladle just hits the turbulence controller at the bottom of the tundish. The turbulent flow of the injection flow is restricted, which can increase the residence time of molten steel in the tundish and effectively reduce the time when the molten steel is poured. The occurrence of splashing can reduce the erosion effect on refractory materials, and more importantly, reduce the oxygen absorption and gas absorption effect when molten steel is splashed and dispersed during pouring. Moreover, the injection flow slowly flows upward along the inclination angle of the inner wall of the turbulence controller to the surface of the molten steel in the tundish, and continuously mixes with the injection flow flowing downward into the turbulence controller, and then flows upward, creating a barrier for inclusions to collide, grow and float Good opportunity to overcome the disadvantage of large dead zone caused by deep liquid level in horizontal continuous casting tundish.

Laboratory hydraulic model data research shows that the use of turbulence controller increases the stagnation time of molten steel in the tundish from 17s to 30s, an increase of 76.47%, so that the inclusions have more than enough time to float up; the volume fraction of the dead zone is reduced from 61.80% Up to 31.64%, the chance of inclusion collision growth is greatly increased.

The detailed structure of the utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Accompanying drawing 1 is the structural representation of the utility model;

Accompanying drawing 2 is A-A sectional view among accompanying drawing 1;

Accompanying drawing 3 is B-B sectional view among accompanying drawing 1.

Detailed ways

As shown in the accompanying drawings: a horizontal continuous casting tundish turbulence controller, which includes a body 1, the body 1 is a three-dimensional rectangle with a length of 760mm x width of 560mm x height of 200mm. A bottomed rectangular cavity 2 is provided on the body 1. The rectangular cavity 2 has a large opening and a small bottom. The upper dimension of the rectangular cavity 2 is 600mm×400mm, the bottom dimension is 300mm×250mm, and the depth is 120mm. The four inner walls of the rectangular cavity 2 are arc surfaces, R1 is 165mm, and R2 is 130mm.

Claims (1)

1. A horizontal continuous casting tundish turbulence controller is characterized in that it includes a body (1), which is a three-dimensional rectangle, and a bottomed rectangular cavity (1) is provided on the body (1). 2), the opening of the rectangular cavity (2) is large, the bottom is small, and the four inner walls of the rectangular cavity (2) are arc surfaces.

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