Argon bottom blowing device for improving purity of molten steel

Abstract

The utility model discloses an argon bottom blowing device for improving the purity of molten steel. The argon bottom blowing device comprises a tundish, a water gap is formed in one side of the bottom face of the tundish, an electromagnetic stirrer is arranged on the outer side of the water gap, an air brick is arranged above the water gap in the tundish, and an argon conveying pipe is arranged at the bottom of the air brick. The gas permeable brick is arranged above the water gap, argon is blown into molten steel, the argon directly acts on molten steel flow, a gas curtain wall is formed around the water gap, floating and removal of inclusions are promoted, the purity of the molten steel is improved, the gas permeable brick is used in cooperation with the electromagnetic stirrer, the molten steel can be effectively stirred, a stirring blind area is eliminated, and the service life of the molten steel is prolonged. And the heat transmission of the molten steel in the tundish is more uniform. And moreover, the uniform molten steel flowing is beneficial to keeping the water gap unobstructed, and the water gap is prevented from being blocked by inclusions or cold steel in the molten steel.

Description

Technical Field

[0001] The utility model relates to an argon bottom blowing device for improving the purity of molten steel. Background Art

[0002] During the continuous casting process, the tundish serves as a transition vessel between the ladle and the mold, and the flow of molten steel within it directly impacts the quality of the continuously cast ingot. While conventional electromagnetic stirring technology can promote the flow and mixing of molten steel to a certain extent, its limited range and intensity often prevent it from achieving complete agitation within the tundish. This is particularly true in the nozzle area, where uneven distribution or weakened electromagnetic field intensity can easily create stirring blind spots. These areas of molten steel experience poor flow, making it difficult for inclusions to float up and be removed, thus compromising the purity of the molten steel. Utility Model Content

[0003] The main purpose of the utility model is to provide an argon bottom blowing device for improving the purity of molten steel, so as to solve the problems raised in the above background technology.

[0004] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0005] An argon bottom blowing device for improving the purity of molten steel comprises a tundish, a water nozzle is provided on one side of the bottom surface of the tundish, an electromagnetic stirrer is provided on the outside of the water nozzle, a permeable brick is provided above the water nozzle in the tundish, and an argon delivery pipe is provided at the bottom of the permeable brick.

[0006] Preferably, the air-permeable brick is a hollow frustum-shaped structure that is smaller at the top and larger at the bottom.

[0007] Preferably, the air brick is arranged directly above the water inlet, and the water inlet corresponds to the hollow area of the air brick.

[0008] Preferably, the bottom and side surfaces of the air-permeable brick are both provided with stainless steel walls.

[0009] Preferably, the bottom surface of the stainless steel wall is provided with a vent hole connected to an argon gas delivery pipe.

[0010] Preferably, the bottom surface of the tundish is provided with a pipe groove for placing an argon gas delivery pipe.

[0011] Preferably, a tube buckle for fixing the argon gas delivery tube is provided on the side wall of the tundish.

[0012] Preferably, the air bricks are connected to the tundish by welding, and refractory materials are provided at the welding points between the air bricks and the tundish.

[0013] Beneficial technical effects of the utility model:

[0014] This utility model installs air-permeable bricks above the nozzle, allowing argon to be blown into the molten steel. The argon directly acts on the molten steel flow, forming an air curtain wall around the nozzle, promoting the floating and removal of inclusions, thereby improving the purity of the molten steel. When used in conjunction with an electromagnetic stirrer, it can effectively stir the molten steel, eliminating the stirring blind spot and ensuring more uniform heat transfer within the tundish. Furthermore, the uniform flow of molten steel helps maintain the nozzle's smooth flow, preventing it from being blocked by inclusions in the molten steel or cold steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the internal structure of the bottom blowing device of an embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the external structure of the bottom blowing device of an embodiment of the present utility model;

[0017] Figure 3 A schematic diagram of the structure of a tundish according to an embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the stainless steel wall structure of an embodiment of the present utility model.

[0019] In the figure: 1. Tundish; 2. Water nozzle; 3. Electromagnetic stirrer; 4. Breathable brick; 5. Argon gas delivery pipe; 6. Stainless steel cladding wall; 7. Vent; 8. Pipe groove; 9. Pipe buckle; 10. Refractory material. DETAILED DESCRIPTION

[0020] In order to make the technical solution of the present invention more clear and specific to those skilled in the art, the present invention is described in further detail below with reference to embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0021] like Figure 1-Figure 4 As shown, the argon bottom blowing device for improving the purity of molten steel provided in this embodiment includes a tundish 1, a water inlet 2 is provided on one side of the bottom surface of the tundish 1, an electromagnetic stirrer 3 is provided on the outside of the water inlet 2, an air permeable brick 4 is provided above the water inlet 2 in the tundish 1, and an argon delivery pipe 5 is provided at the bottom of the air permeable brick 4.

[0022] The air brick 4 is made of corundum, and the argon delivery pipe 5 is made of 304 stainless steel. The air brick 4 is pre-buried in the ladle 1, and the argon delivery pipe 5 is connected to the equipment for providing argon. When in use, the electromagnetic stirrer 3 is turned on to stir the molten steel, and argon is introduced into the molten steel to form an air curtain wall around the nozzle 2 to promote the floating and removal of inclusions. The argon promotes the flow of molten steel, eliminates the stirring blind area above the nozzle 2, and makes the molten steel in the entire area fully stirred, thereby improving the purity of the molten steel.

[0023] In this embodiment, if Figure 1As shown, the air brick 4 is a hollow frustum-shaped structure with a small top and a large bottom, which is conducive to the uniform distribution of argon gas and the formation of bubbles, thereby improving the purity of molten steel.

[0024] In this embodiment, if Figure 1 As shown, the air brick 4 is arranged just above the nozzle 2, and the nozzle 2 corresponds to the hollow area of the air brick 4, which can form an air curtain wall around the nozzle 2, which is beneficial to the floating of inclusions in the molten steel and reduces large particle inclusions.

[0025] In this embodiment, if Figure 1 As shown, the bottom and side surfaces of the air brick 4 are both provided with stainless steel walls 6 , which can protect the air brick 4 from being corroded by molten steel and extend the service life of the air brick 4 .

[0026] In this embodiment, if Figure 4 As shown, the bottom surface of the stainless steel wall 6 is provided with a vent hole 7 connected to the argon delivery pipe 5 to ensure smooth delivery of argon.

[0027] In this embodiment, if Figure 1 As shown, the bottom surface of the tundish 1 is provided with a pipe groove 8 for placing the argon gas delivery pipe 5, and the side wall of the tundish 1 is provided with a pipe buckle 9 for fixing the argon gas delivery pipe 5 to fix the position of the argon gas delivery pipe 5 and prevent the argon gas delivery pipe 5 from moving and affecting the delivery of argon.

[0028] In this embodiment, if Figure 1 As shown, the air brick 4 is connected to the tundish 1 by welding, and the welding portion between the air brick 4 and the tundish 1 is provided with a refractory material 10, which can improve the wear resistance and corrosion resistance of the welding portion and extend the service life.

[0029] In summary, in this embodiment, by installing a permeable brick 4 above the nozzle 2 and blowing argon into the molten steel, the argon directly acts on the molten steel flow, forming an air curtain wall around the nozzle 2, promoting the floating and removal of inclusions, thereby improving the purity of the molten steel. When used in conjunction with the electromagnetic stirrer 3, the molten steel can be effectively stirred, thereby eliminating the stirring blind spot and making the heat transfer of the molten steel in the tundish 1 more uniform. In addition, the uniform flow of molten steel helps to keep the nozzle 2 unobstructed and prevent the nozzle 2 from being blocked by inclusions in the molten steel or cold steel.

[0030] The above is only a further embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and concept of the present invention within the scope disclosed by the present invention, which falls within the protection scope of the present invention.

Claims

1. An argon bottom blowing device for improving the purity of molten steel, characterized by: The invention comprises a tundish (1), wherein a water inlet (2) is provided on one side of the bottom surface of the tundish (1), an electromagnetic stirrer (3) is provided outside the water inlet (2), a permeable brick (4) is provided above the water inlet (2) in the tundish (1), and an argon gas delivery pipe (5) is provided at the bottom of the permeable brick (4).

2. The argon bottom blowing device for improving the purity of molten steel according to claim 1, characterized in that: The air-permeable brick (4) is a hollow truncated cone structure that is smaller at the top and larger at the bottom.

3. The argon bottom blowing device for improving the purity of molten steel according to claim 2, characterized in that: The air-permeable brick (4) is arranged directly above the water inlet (2), and the water inlet (2) corresponds to the hollow area of the air-permeable brick (4).

4. The argon bottom blowing device for improving the purity of molten steel according to claim 1, characterized in that: The bottom and side surfaces of the air-permeable brick (4) are both provided with stainless steel walls (6).

5. The argon bottom blowing device for improving the purity of molten steel according to claim 4, characterized in that: The bottom surface of the stainless steel wall (6) is provided with a vent hole (7) connected to the argon gas delivery pipe (5).

6. The argon bottom blowing device for improving the purity of molten steel according to claim 1, characterized in that: The bottom surface of the tundish (1) is provided with a pipe groove (8) for placing an argon gas delivery pipe (5).

7. The argon bottom blowing device for improving the purity of molten steel according to claim 1, characterized in that: A tube buckle (9) for fixing the argon gas delivery tube (5) is provided on the side wall of the tundish (1).

8. The argon bottom blowing device for improving the purity of molten steel according to claim 1, characterized in that: The air-permeable brick (4) is connected to the tundish (1) by welding, and a refractory material (10) is provided at the welding point between the air-permeable brick (4) and the tundish (1).

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