Steel ladle for producing ultra-pure stainless steel for nuclear power

Abstract

The utility model discloses a steel ladle for producing ultra-pure stainless steel for nuclear power, which comprises a shell (1), a lower pouring layer (2) is arranged at the bottom in the shell (1), a bottom magnesia carbon brick layer (3) is arranged above the lower pouring layer (2), and an upper pouring layer (4) and an upper magnesia carbon brick layer (5) are sequentially arranged above the bottom magnesia carbon brick layer (3); a group of annularly distributed side ventilation openings (6) are formed in the bottom of the shell (1), a middle ventilation opening (7) is formed in the middle of the bottom of the shell (1), and the side ventilation openings (6) and the middle ventilation opening (7) penetrate through the lower pouring layer (2), the bottom magnesia carbon brick layer (3), the upper pouring layer (4) and the upper magnesia carbon brick layer (5); and a side magnesia carbon brick layer (8) is arranged on the inner side wall surface of the shell (1). The utility model has the characteristic that the production efficiency can be effectively improved.

Description

Technical Field

[0001] The utility model relates to a steel ladle, in particular to a steel ladle for producing ultra-pure stainless steel for nuclear power. Background Art

[0002] Currently, the three most commonly used refining methods in domestic plants are the single-slag method, the double-slag method, and the double-slag retention method. The single-slag method involves creating slag only once during the smelting process, without slag removal until the final tapping point. The single-slag method offers the advantages of simplicity and reduced smelting time. Compared to the double-slag refining method, the single-slag method effectively suppresses carbon skipping during the final reduction stage of ultra-pure stainless steel for nuclear power generation, significantly reducing non-metallic inclusions. All of these methods utilize a ladle bottom-blowing system for agitation to remove gases and inclusions. The refining process for ultra-pure stainless steel for nuclear power generation requires further improvement in refining efficiency and effective control of large inclusions and their content. However, current ladle bottom-blowing agitation is limited to the center of the ladle, resulting in a narrow agitation range, low efficiency, and a long refining time, which cannot meet these requirements. Consequently, existing technologies suffer from low production efficiency. Utility Model Content

[0003] The purpose of the utility model is to provide a ladle for producing ultra-pure stainless steel for nuclear power plants. The utility model has the characteristic of being able to effectively improve production efficiency.

[0004] The technical solution of the utility model is as follows: a ladle for the production of ultra-pure stainless steel for nuclear power, comprising a shell, a lower casting layer is provided at the bottom of the shell, a bottom magnesia-carbon brick layer is provided above the lower casting layer, an upper casting layer and an upper magnesia-carbon brick layer are provided above the bottom magnesia-carbon brick layer in sequence; a group of annularly distributed side air vents are provided at the bottom of the shell, a middle air vent is provided at the middle position of the bottom of the shell, and both the side air vents and the middle air vents pass through the lower casting layer, the bottom magnesia-carbon brick layer, the upper casting layer and the upper magnesia-carbon brick layer; a side magnesia-carbon brick layer is provided on the inner wall of the shell.

[0005] In the aforementioned ladle for the production of ultra-pure stainless steel for nuclear power, a group of annularly distributed T-shaped axial ribs are provided on the inner wall of the shell, and the T-shaped axial ribs are located between two adjacent side magnesia-carbon brick layers; the two ends of the back of the side magnesia-carbon brick layers are provided with snap-in grooves that match the T-shaped axial ribs.

[0006] In the aforementioned ladle for producing ultra-pure stainless steel for nuclear power, the surfaces of the side magnesia-carbon brick layer and the upper magnesia-carbon brick layer are both provided with an anti-oxidation coating.

[0007] In the aforementioned ladle for producing ultra-pure stainless steel for nuclear power, the side air vents are arranged obliquely, and the oblique direction is toward the center of the shell.

[0008] Compared with the existing technology, the present invention provides a set of annularly distributed side air vents at the bottom of the shell, and a central air vent at the middle position of the shell bottom. These two functions cooperate with the bottom blowing system to achieve bottom blowing and stirring of the molten steel in the ladle from multiple different angles, expanding the stirring and impurity removal range, reducing the existence of dead angles, effectively improving stirring efficiency, improving impurity removal quality, and enhancing refining effects. In summary, the present invention has the characteristics of being able to effectively improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural diagram of the utility model;

[0010] Figure 2 It is an assembly diagram between the T-shaped axial ribs and the snap-in grooves on the back of the side magnesia carbon brick layer.

[0011] The markings in the accompanying drawings are: 1-shell, 2-lower casting layer, 3-bottom magnesia carbon brick layer, 4-upper casting layer, 5-upper magnesia carbon brick layer, 6-side air vent, 7-middle air vent, 8-side magnesia carbon brick layer, 9-T-shaped axial rib, 10-clamping groove. DETAILED DESCRIPTION

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0013] Example: A ladle for producing ultra-pure stainless steel for nuclear power, comprising: Figure 1-2 As shown, it includes a shell 1, a lower casting layer 2 is provided at the bottom of the shell 1, a bottom magnesia-carbon brick layer 3 is provided above the lower casting layer 2, and an upper casting layer 4 and an upper magnesia-carbon brick layer 5 are provided above the bottom magnesia-carbon brick layer 3 in sequence; a group of annularly distributed side air vents 6 are provided at the bottom of the shell 1, and a middle air vent 7 is provided at the middle position of the bottom of the shell 1, and the side air vents 6 and the middle air vents 7 both penetrate the lower casting layer 2, the bottom magnesia-carbon brick layer 3, the upper casting layer 4 and the upper magnesia-carbon brick layer 5; the inner wall of the shell 1 is provided with a side magnesia-carbon brick layer 8.

[0014] A group of annularly distributed T-shaped axial ribs 9 are provided on the inner wall of the shell 1, and the T-shaped axial ribs 9 are located between two adjacent side magnesia-carbon brick layers 8; the two ends of the back of the side magnesia-carbon brick layer 8 are provided with a clamping groove 10 that matches the T-shaped axial ribs 9.

[0015] The surfaces of the side magnesia carbon brick layer 8 and the upper magnesia carbon brick layer 5 are both provided with an anti-oxidation coating.

[0016] The side air vents 6 are arranged in an inclined manner, and the inclined direction is toward the center of the housing 1 .

[0017] The present application provides a group of annularly distributed T-shaped axial ribs on the inner wall of the shell to fix the side magnesia carbon brick layer, making it easier to install and fix, and improving the installation accuracy and connection firmness.

[0018] The specific installation process is: insert the snap-in grooves at both ends of the back of the side magnesia carbon brick layer between two adjacent T-shaped axial ribs, and stack them from bottom to top to achieve the installation and fixation of the side magnesia carbon brick layer in the upper and lower height directions; according to the above method, complete the installation and fixation of each row of side magnesia carbon brick layers in the circumferential direction in sequence.

[0019] The oxidation thickness of the magnesia carbon bricks sprayed with anti-oxidation coating after baking is only 2-4mm, which is only about 10% of the original thickness, thus effectively improving the corrosion resistance.

[0020] The side air vents and the middle air vents are connected to an argon bottom blowing system via pipelines.

[0021] Preferably, an annular tube is provided at the bottom of the shell to match the side air vent, and a gas outlet is provided on the annular tube to match the side air vent. One end of the annular tube is connected to the argon bottom blowing system, and the middle air vent is also connected to the argon bottom blowing system through a pipeline.

[0022] The side vents include first and second vents that are alternately distributed, and the first and second vents have different inclination angles, which can further expand the stirring area and range, form turbulence inside the molten steel, and improve the stirring quality.

[0023] When the utility model performs bottom blowing operation, argon gas is blown into the corresponding middle air vent and side air vent through the bottom blowing system and enters the interior of the shell, stirring the molten steel from bottom to top from multiple different angles, which can not only effectively expand the stirring range and improve the stirring efficiency, but also greatly improve the impurity removal quality.

Claims

1. Ladle for the production of ultra-pure stainless steel for nuclear power, characterized by: The invention comprises a shell (1), wherein a lower casting layer (2) is provided at the bottom of the shell (1), a bottom magnesium carbon brick layer (3) is provided above the lower casting layer (2), and an upper casting layer (4) and an upper magnesium carbon brick layer (5) are provided above the bottom magnesium carbon brick layer (3) in sequence; a group of annularly distributed side air vents (6) are provided at the bottom of the shell (1), a middle air vent (7) is provided at the middle position of the bottom of the shell (1), and both the side air vents (6) and the middle air vent (7) penetrate the lower casting layer (2), the bottom magnesium carbon brick layer (3), the upper casting layer (4) and the upper magnesium carbon brick layer (5); and a side magnesium carbon brick layer (8) is provided on the inner wall surface of the shell (1).

2. The ladle for producing ultrapure stainless steel for nuclear power according to claim 1, characterized in that: A group of annularly distributed T-shaped axial ribs (9) are provided on the inner wall of the shell (1), and the T-shaped axial ribs (9) are located between two adjacent side magnesium carbon brick layers (8); and clamping grooves (10) matching the T-shaped axial ribs (9) are provided at both ends of the back surface of the side magnesium carbon brick layers (8).

3. The ladle for producing ultrapure stainless steel for nuclear power according to claim 1, characterized in that: The surfaces of the side magnesia carbon brick layer (8) and the upper magnesia carbon brick layer (5) are both provided with an anti-oxidation coating.

4. The ladle for producing ultrapure stainless steel for nuclear power according to claim 1, characterized in that: The side air vents (6) are arranged in an inclined manner, and the inclination direction is toward the center of the shell (1).

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