Multi-machine multi-strand continuous casting tundish with turbulence controller

Abstract

The invention relates to a multi-machine multi-strand continuous casting tundish with a turbulence controller, and belongs to the technical field of steelmaking production in the metallurgical industry. According to the technical scheme, a plurality of pouring positions are arranged at the bottom of the intermediate tank, each pouring position corresponds to one flow of a continuous casting machine, a brick cup (3) is installed on each flow of pouring position, a pouring ring (2) is arranged on each brick cup (3), a composite water gap (4) is formed in each brick cup (3), and each composite water gap (4) is connected with a lower water gap (9); a turbulent flow controller (8) is arranged in the tundish and close to the wall of the tundish, the turbulent flow controller (8) is a pouring groove (15) made of refractory materials, and a flow guide hole (6) leading to the tundish is formed in the pouring groove (15). The method has the beneficial effects that molten steel can be reasonably distributed, the turbulence prevention effect is good, the phenomenon of molten steel liquid level slagging in an impact area is avoided, the impact kinetic energy of steel ladle injection flow can be properly reduced, and the situation that the flow field form is unreasonable due to fluid discontinuity is prevented.

Description

Technical Field

[0001] The invention relates to a multi-machine multi-stream continuous casting tundish with a turbulence controller, belonging to the technical field of steelmaking production in the metallurgical industry. Background Art

[0002] Tundish operation is one of the key links in the continuous casting production process. The flow state of molten steel in the tundish affects its composition, temperature uniformity, and the floating and removal effect of inclusions. Preventing inclusions in the tundish from entering the crystallizer is one of the important means of producing high-purity steel. Therefore, installing a suitable flow control device in the tundish can effectively improve the flow field of molten steel in the tundish, promote the floating of non-metallic inclusions, reduce slag and air entanglement, change the flow state of molten steel in the tundish, reduce the scouring of the ladle lining, and prevent splashing when pouring.

[0003] At present, the development of continuous casting machines is developing in the direction of multiple machines and multiple streams. Six-machine six-stream, eight-machine eight-stream are very common, and ten-machine ten-stream, twelve-machine twelve-stream continuous casting machines have appeared. The more streams a continuous casting machine has, the more difficult it is for the tundish to control the flow field and temperature field. It cannot balance the average residence time and temperature of each stream, which is not conducive to the successful pouring and normal pouring of each stream. Moreover, during the pouring process of the tundish of the continuous casting machine, the high-temperature molten steel will severely scour the bottom of the stopper rod of the stream near the ladle pouring impact zone, causing serious erosion of the refractory material, and the large and medium-sized inclusions in the molten steel will exceed the standard, so that the service life of the tundish cannot be guaranteed. Summary of the invention

[0004] The purpose of the present invention is to provide a multi-machine and multi-stream continuous casting intermediate tank with a turbulence controller, which can reasonably distribute molten steel, not only has a good anti-turbulence effect and does not cause slagging on the molten steel surface in the impact zone, but also can appropriately reduce the impact kinetic energy of the ladle injection flow, prevent the occurrence of unreasonable flow field morphology caused by fluid discontinuity, and solve the problems existing in the background technology.

[0005] The technical solution of the present invention is: A multi-machine multi-stream continuous casting tundish with a turbulence controller is provided with multiple pouring positions at the bottom of the tundish, each pouring position corresponds to a stream of the continuous casting machine, a seat brick is installed at each stream pouring position, a pouring ring is provided on the seat brick, a composite water inlet matched with a stopper rod is provided inside the seat brick, and the composite water inlet is connected to a lower water inlet; a turbulence controller is arranged in the tundish near the wall of the tundish, the turbulence controller is a casting trough made of refractory material matched with a long water inlet of a ladle, and a guide hole leading to the tundish is provided on the casting trough.

[0006] The casting trough is a trough structure consisting of a side wall facing the casting position, a side wall facing the intermediate tank wall and a casting trough bottom, and the guide hole is arranged on the side wall facing the casting position.

[0007] The guide hole is inclined.

[0008] The guide hole is inclined upward by 15 degrees according to the flow direction of the molten steel.

[0009] The side wall facing the pouring position is in an arc shape connected to the side wall facing the intermediate tank wall.

[0010] The thickness of the bottom of the casting trough is greater than the thickness of the side wall facing the casting position and the side wall facing the wall of the intermediate tank.

[0011] The pouring ring is an annular slag retaining wall built with refractory materials.

[0012] The beneficial effects of the present invention are as follows: the turbulence controller not only has a good anti-turbulence effect and does not cause slagging on the molten steel surface in the impact zone, but also can appropriately reduce the impact kinetic energy of the ladle injection and supplement the insufficient kinetic energy of the fluid in the forward process, thereby preventing the occurrence of unreasonable flow field morphology due to fluid discontinuity. More importantly, since it can reasonably distribute the molten steel, the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a layout diagram of the tundish of the twelve-machine twelve-strand continuous casting machine of the present invention; Figure 2 It is a cross-sectional view of the present invention; Figure 3 A top view of the present invention; Figure 4 for Figure 2 Enlarged view of the middle pouring position; Figure 5 This is a front view of the turbulence controller of the present invention; Figure 6 A top view of the turbulence controller of the present invention; In the figure: stopper rod 1, opening ring 2, seat brick 3, composite nozzle 4, middle ladle cover 5, guide hole 6, long ladle nozzle 7, turbulence controller 8, downspout 9, intermediate tank body 10, turbulence controller body 11, side wall facing the pouring position 12, side wall facing the intermediate tank wall 13, turbulence controller bottom 14, pouring trough 15, overflow trough 16. DETAILED DESCRIPTION

[0014] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0015] Refer to the attached Figure 1-6A multi-machine multi-stream continuous casting intermediate tank with a turbulence controller, wherein a plurality of pouring positions are arranged at the bottom of the intermediate tank, each pouring position corresponds to a stream of the continuous casting machine, and a seat brick 3 is installed at each stream pouring position, on which a pouring ring 2 is arranged, and a composite water inlet 4 cooperating with a stopper rod 1 is arranged inside the seat brick 3, and the composite water inlet 4 is connected to a lower water inlet 9; a turbulence controller 8 is arranged in the intermediate tank near the intermediate tank wall, and the turbulence controller 8 is a casting trough 15 made of refractory material and cooperating with a long water inlet 7 of a ladle, and a guide hole 6 leading to the intermediate tank is arranged on the casting trough 15.

[0016] In this embodiment, the attached Figure 1 This is the layout diagram of the tundish for the twelve-machine twelve-strand continuous casting machine. Since the twelve-machine twelve-strand casting machine has one ladle and two tundishes during the pouring process, the two tundishes can pour six streams respectively, which are symmetrically distributed.

[0017] Refer to the attached Figure 2-6 The intermediate tank is composed of a stopper rod 1, a pouring ring 2, a base brick 3, a composite nozzle 4, a middle ladle cover 5, a guide hole 6, a ladle long nozzle 7, a turbulence controller 8 and a down nozzle 9, wherein: The intermediate tank has a permanent layer and a working layer. A seat brick 3 is installed at each pouring position at the bottom of the intermediate tank. A pouring ring 2 is arranged on the seat brick 3. The pouring ring 2 is an annular slag retaining wall built of refractory materials. A composite water inlet 4 is installed in the seat brick 3. The upper side cooperates with the stopper rod 1 to complete the function of controlling the molten steel. The lower side is connected with the downspout 9 to guide the molten steel into the crystallizer.

[0018] The turbulence controller 8 is a pouring trough 15 made of magnesium-aluminum spinel raw material by an inverted vibration molding method. The pouring trough 15 is a trough structure composed of a side wall 12 facing the pouring position, a side wall 13 facing the intermediate tank wall, and a pouring trough bottom 14. The side wall 12 facing the pouring position is an arc connected to the side wall 13 facing the intermediate tank wall. Since the pouring trough bottom 14 is impacted by molten steel, the pouring trough bottom 14 is several times thicker than the side wall 12 facing the pouring position and the side wall 13 facing the intermediate tank wall. In addition, there are guide holes 6 with an upward angle of 15° on the side wall 12 facing the pouring position, and the apertures are 120 mm respectively. The purpose is to make the molten steel rise, prolong the residence time of the molten steel, and prevent the high-temperature molten steel from directly entering the water inlet of each flow, thereby reducing the erosion of the stopper rod by the molten steel. The specific pouring process is as follows: the molten steel first enters the pouring trough 15 of the turbulence controller 8 from the ladle long nozzle 7. The buffering effect of the pouring trough 15 consumes a large amount of turbulent kinetic energy, so that the speed of the molten steel entering the distribution area is reduced, the flow rate is slow, and the flow is relatively stable; then the molten steel enters the intermediate tank through the oblique upward guide hole 6, and the molten steel is diverted to the continuous casting machine. Most of the molten steel flows along the surface, and forms a backflow between the stopper rod 1 near the turbulence controller 8 of the intermediate tank, which prompts the molten steel to flow to the surface, reducing the scouring of the bottom of the stopper rod 1. On the other hand, it dissipates high-speed turbulent kinetic energy, so that the molten steel moves obliquely upward through the guide hole 6, the flow route of the molten steel increases, the piston flow increases, and the streamlines of each flow are relatively uniform.

[0019] In addition, since the pouring ring 2 raises the liquid level in the intermediate tank during pouring, it is convenient to pour and control the flow at the same time; the seat brick 3 of each flow is used to fix the composite water nozzle 4, and the stopper rod 1 and the composite water nozzle 4 cooperate to control the pouring and the flow rate of molten steel. The lower end of the composite water nozzle 4 is connected to the downspout 9 to guide the molten steel into the crystallizer.

Claims

1. A multi-machine multi-stream continuous casting tundish with a turbulence controller, characterized in that: A plurality of pouring positions are arranged at the bottom of the intermediate tank, each pouring position corresponds to a stream of the continuous casting machine, and a seat brick (3) is installed at each stream pouring position, a pouring ring (2) is arranged on the seat brick (3), a composite water inlet (4) matched with the stopper rod (1) is arranged inside the seat brick (3), and the composite water inlet (4) is connected to the lower water inlet (9); a turbulence controller (8) is arranged in the intermediate tank near the intermediate tank wall, and the turbulence controller (8) is a pouring trough (15) made of refractory material and matched with the long water inlet (7) of the ladle, and a guide hole (6) leading to the intermediate tank is arranged on the pouring trough (15).

2. The multi-machine multi-stream continuous casting tundish with a turbulence controller according to claim 1, characterized in that: The pouring trough (15) is a trough structure consisting of a side wall (12) facing the pouring position, a side wall (13) facing the intermediate tank wall, and a pouring trough bottom (14), and the guide hole (6) is arranged on the side wall (12) facing the pouring position.

3. The multi-machine multi-stream continuous casting tundish with a turbulence controller according to claim 2, characterized in that: The guide hole (6) is inclined.

4. The multi-machine multi-stream continuous casting tundish with a turbulence controller according to claim 3, characterized in that: The guide hole (6) is inclined upward at 15° according to the flow direction of the molten steel.

5. The multi-machine multi-stream continuous casting tundish with a turbulence controller according to claim 2, characterized in that: The side wall (12) facing the pouring position is in an arc shape connected to the side wall (13) facing the intermediate tank wall.

6. The multi-machine multi-stream continuous casting tundish with a turbulence controller according to claim 2, characterized in that: The thickness of the bottom (14) of the casting trough is greater than the thickness of the side wall (12) facing the casting position and the side wall (13) facing the wall of the intermediate tank.

7. The multi-machine multi-stream continuous casting tundish with a turbulence controller according to claim 1, characterized in that: The pouring ring (2) is an annular slag retaining wall built with refractory materials.

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