CN215919072U

CN215919072U - Tundish for bloom

Info

Publication number: CN215919072U
Application number: CN202121780339.XU
Authority: CN
Inventors: 李明; 刘桂丽; 陶鑣; 赵柏杰
Original assignee: Nanjing Iron and Steel Co Ltd
Current assignee: Nanjing Iron and Steel Co Ltd
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2022-03-01
Anticipated expiration: 2031-08-02

Abstract

The utility model discloses a bloom tundish, which comprises a slag wall and a dam; the slag blocking wall is divided into a left slag blocking wall and a right slag blocking wall, the upper end parts of the left slag blocking wall and the right slag blocking wall are vertically embedded in the inner wall of the tundish, the lower end parts of the left slag blocking wall and the right slag blocking wall are provided with bent angles and are obliquely inserted into the inner wall of the tundish, the left slag blocking wall and the right slag blocking wall are respectively provided with two flow guide holes different in size, the wall surface of the slag blocking wall inside the impact area is covered with a refractory material, the blocking dam is divided into a left blocking dam and a right blocking dam, and the left and the right blocking dams are vertically installed at the bottom of the tundish. The slag blocking wall of the tundish effectively prevents collapse accidents, the flow state of molten steel in the tundish can be obviously improved by arranging the upper flow guiding hole and the lower flow guiding hole which are different in size, good effects are shown in the aspects of distributing the molten steel among the flows, prolonging the retention time and the like by matching with the dam, a good promoting effect is achieved on components and temperature of the uniform molten steel, and the quality of the molten steel is improved.

Description

Tundish for bloom

Technical Field

The utility model relates to a tundish, in particular to a bloom tundish, and belongs to the field of metallurgy.

Background

In the continuous casting process, molten steel is injected into a tundish at a high drawing speed, strong vortex and turbulent flow are formed in the tundish, slag is easily involved in the molten steel, and the quality of steel is further influenced. The slag wall can drift after long-term use, so that the position of the intermediate flow stopper is resisted, and safety accidents are easy to happen. In addition, the retention time of the molten steel is insufficient, the floating time of impurities is insufficient, the purity of the molten steel is reduced, and the quality of steel is influenced.

CN201620798807.9 relates to a filtering type slag wall for a tundish impact area for continuous casting of a square billet, which comprises a slag wall body formed by a left side wall, a middle wall and a right side wall into a whole, wherein the left side wall and the right side wall are respectively provided with a side wall steel flowing hole, the middle wall is provided with a middle wall steel flowing hole, a core reinforcing plate is arranged in the slag wall body, and the side wall steel flowing holes penetrate through the core reinforcing plate; and a porous ceramic filter plate is arranged at a molten steel inlet of the side wall flow steel hole and is tightly combined in the side wall flow steel hole. The problem that the support frame of the slag-stopping wall is easy to corrode, the slag-stopping wall is easy to collapse, the temperature difference in the tundish is large, and the residence time of molten steel is not enough is not solved.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims to provide a bloom tundish which can effectively solve the problems that a slag wall in the tundish is easy to drift and collapse, the temperature difference in the tundish is large and the residence time of molten steel is insufficient.

The technical scheme is as follows: a bloom tundish comprises a slag wall and a dam; the slag blocking wall is divided into a left slag blocking wall and a right slag blocking wall, the upper end parts of the left slag blocking wall and the right slag blocking wall are vertically embedded in the inner wall of the tundish, the lower end parts of the left slag blocking wall and the right slag blocking wall are provided with bent angles and are obliquely inserted into the inner wall of the tundish, the left slag blocking wall and the right slag blocking wall are respectively provided with two flow guide holes different in size, the wall surface of the slag blocking wall inside the impact area is covered with a refractory material, the blocking dam is divided into a left blocking dam and a right blocking dam, and the left and the right blocking dams are vertically installed at the bottom of the tundish.

Furthermore, the lower end part of the slag blocking wall is in a sharp-angled shape and is embedded in the side wall of the tundish to be tightly attached, so that a gap at a joint is reduced.

Furthermore, the heights of the diversion holes on the wall surface are different, the diameter of the diversion hole at the lower part is smaller than that of the diversion hole at the higher part, the diameter of the diversion hole at the lower part is small, the retention time of molten steel is prolonged, the flow of the molten steel flowing out of the diversion hole at the higher part is large, the stagnation of the molten steel above water gaps at two sides of the tundish is avoided, and the volume of a dead zone is reduced.

Furthermore, the refractory material is a magnesium refractory material, and the covering of the refractory material can reduce the residual steel amount in the flow guide partition wall, further prolong the residence time of the molten steel and further reduce the volume of a dead zone.

Furthermore, the height of the dam is between the horizontal heights of the upper and lower diversion holes of the slag wall, so that the molten steel stream flowing out of the diversion holes of the slag wall is buffered, and the response time of each stream of the water outlet is prolonged.

Has the advantages that: compared with the prior art, the utility model has the following advantages: 1. the upper end and the lower end of the slag-stopping wall are embedded and tightly attached to the side wall of the tundish, so that the slag-stopping wall is prevented from being separated from the side wall of the tundish to cause the drifting and collapsing phenomena of the slag-stopping wall. 2. The tundish slag blocking wall is provided with two steel flowing holes with different sizes and heights, and the combination of the left and right dams can prolong the retention time of molten steel to be more than 15min, improve the flowing state of the molten steel in the tundish, promote inclusions to float upwards and reduce the volume of dead zones.

Drawings

FIG. 1 is a schematic top view of the present invention;

FIG. 2 is a side view of a slag wall;

FIG. 3 is a top view of a slag dam;

FIG. 4 is a front view of a slag wall.

Detailed Description

As shown in figure 1, the bloom tundish comprises a left slag wall 1, a right slag wall 2, a left dam 3 and a right dam 4, wherein the upper ends of the left slag wall and the right slag wall are vertically embedded in the inner wall of the tundish, the lower ends of the left slag wall and the right slag wall are provided with bent angles and are obliquely inserted into the inner wall of the tundish, the left slag wall and the right slag wall are respectively provided with two flow guide holes with different heights and sizes, the wall surfaces of the slag walls in an impact area are covered with refractory materials, the left dam and the right dam are vertically arranged at the bottom of the tundish, and the height of the dam is between the horizontal heights of the upper flow guide hole and the lower flow guide hole of the slag walls.

As shown in fig. 1 to 2, in the working process of the tundish, molten steel flows out from two flow guide holes with different sizes of a left slag wall 1 and a right slag wall 2 in sequence, the molten steel flows out from the flow guide holes below and then reaches a left dam 3 and a right dam 4, and then molten steel flow forms large-range circular flow in the tundish, so that the components and the temperature of the molten steel flowing out from the two flow guide holes at the lower part tend to be consistent, the floating removal of inclusions in the molten steel is facilitated, and the heat exchange between the molten steel is promoted; when the liquid level is lifted, the rear part of molten steel stream flowing out from the high steel flowing hole flows to the edge water gap along the liquid level, so that the stagnation of the molten steel above the water outlet is avoided, and the dead zone volume of the corner area can be effectively reduced.

Through the design, the difference of the whole temperature field in the tundish is obviously reduced, the temperature uniformity of the molten steel is obviously improved, and the temperature difference of each water gap under small flow is only 3K; meanwhile, the flow velocity of molten steel in the tundish is improved, the velocity field is obviously improved, and the flowing consistency of the molten steel is enhanced; the response time of each flow at the water gap is obviously prolonged, the average response time under the flow rate of 50-70L/min is 140s, the residence time of each flow is 900 s-1200 s, and the volume of the dead zone is 18.2-22.2%.

Claims

1. A bloom tundish comprises a slag wall and a dam; the method is characterized in that: the slag blocking wall is divided into a left slag blocking wall (1) and a right slag blocking wall (2), the upper end parts of the left slag blocking wall and the right slag blocking wall are vertically embedded in the inner wall of the tundish, the lower end parts of the left slag blocking wall and the right slag blocking wall are provided with bent angles and are obliquely inserted into the inner wall of the tundish, the left slag blocking wall and the right slag blocking wall are respectively provided with two flow guide holes different in size, the wall surface of the slag blocking wall inside the impact area is covered with a refractory material, the blocking dam is divided into a left blocking dam (3) and a right blocking dam (4), and the left slag blocking wall and the right blocking wall are vertically installed at the bottom of the tundish.

2. A bloom tundish as claimed in claim 1 wherein: the lower end part of the slag blocking wall is in a sharp angle shape.

3. A bloom tundish as claimed in claim 1 wherein: the heights of the diversion holes on the wall surface are different, and the diameter of the diversion hole at the lower part is smaller than that of the diversion hole at the higher part.

4. A bloom tundish as claimed in claim 1 wherein: the refractory material is a magnesium refractory material.

5. A bloom tundish as claimed in claim 1 wherein: the height of the dam is between the horizontal height of the upper and lower diversion holes of the slag blocking wall.