A spiral waterway protection sleeve for an electric arc furnace

Abstract

This utility model relates to the field of cooling technology for metallurgical equipment, specifically a spiral water circuit protective sleeve for a submerged arc furnace. It includes an outer sleeve and an inner sleeve, both of which are hollow cylinders, with the inner sleeve located inside the outer sleeve. The upper and lower ends of the outer and inner sleeves are respectively connected to an upper sealing plate and a lower sealing plate. It also includes four guide plates, each spirally coiled on the inner sleeve. The annular cooling cavity between the outer and inner sleeves is divided into a first water circuit, a second water circuit, a third water circuit, and a fourth water circuit by the four guide plates. This utility model uses four spiral guide plates to divide the annular cooling cavity into the first to fourth water circuits, forcing the cooling water to rise along the spiral path and extending the contact time. Furthermore, the bottom inlet pipe and the top outlet pipe form a "low in, high out" counter-flow, preventing the mixing of hot and cold water and ensuring sufficient heat absorption. The four water circuits surround the inner sleeve at an angle, eliminating cooling dead zones and evenly covering the hot zone of the furnace body.

Description

Technical Field

[0001] This utility model relates to the field of cooling technology for metallurgical equipment, specifically a spiral water circuit protective sleeve for a submerged arc furnace. Background Technology

[0002] Under high-temperature operating conditions of electric arc furnaces, traditional cooling protection jackets often suffer from insufficient performance due to the following problems:

[0003] 1. Water flow short circuit: A single annular water channel is prone to local turbulence or stagnation of cooling water, which reduces heat exchange efficiency;

[0004] 2. Uneven cooling: The short water flow path and lack of zone design lead to localized overheating of the furnace body, shortening the equipment's lifespan;

[0005] 3. Structural strength: Traditional straight-plate partitions are prone to deformation due to thermal stress, affecting sealing and durability.

[0006] The above problems urgently require a protective sleeve design that can achieve efficient zoned cooling and enhance structural stability. Utility Model Content

[0007] The purpose of this invention is to provide a spiral water circuit protection sleeve for a submerged arc furnace, which solves the problems mentioned in the background section of the prior art in the existing cooling protection sleeves.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a spiral water circuit protective sleeve for a submerged arc furnace, comprising an outer sleeve and an inner sleeve, both of which are hollow cylinders with the inner sleeve located inside the outer sleeve. The upper and lower ends of the outer sleeve and the inner sleeve are respectively connected to an upper sealing plate and a lower sealing plate. It also includes four guide plates, all of which are spirally arranged and coiled on the inner sleeve. The annular cooling cavity between the outer sleeve and the inner sleeve is divided into a first water circuit, a second water circuit, a third water circuit, and a fourth water circuit by the four guide plates.

[0009] Furthermore, the bottom of the first, second, third, and fourth water channels is provided with water inlet pipes, and the upper part of the first, second, third, and fourth water channels is provided with water outlet pipes.

[0010] Furthermore, the ends of both the inlet pipe and the outlet pipe extend to the outside of the upper end of the inner sleeve.

[0011] Furthermore, the upper sealing plate is provided with multiple hanging rods at equal intervals along its axial direction.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. Improved heat exchange efficiency: This invention uses four spiral guide plates to divide the annular cooling chamber into first to fourth water channels, forcing the cooling water to rise along the spiral path and extending the contact time. Furthermore, the bottom inlet pipe and top outlet pipe form a "low in, high out" counter-flow, preventing the mixing of hot and cold water and ensuring full heat absorption.

[0014] 2. Enhanced cooling uniformity and reliability: The four water channels surround the inner sleeve 2 at an angle, eliminating cooling dead corners and evenly covering the hot zone of the furnace body; and the spiral guide plate 5 is welded to the outer wall of the inner sleeve 2 and abuts against the outer sleeve 1 to form a supporting frame, improving the resistance to thermal deformation.

[0015] 3. Ease of maintenance and installation: All inlet and outlet pipes extend to the outside of the upper part of the inner sleeve, facilitating centralized connection to the external circulation system.

[0016] 4. Optimized hoisting: The upper sealing plate is equipped with multiple sets of lifting rods to support axial equidistant hanging and ensure installation stability.

[0017] This invention breaks through the heat exchange bottleneck of traditional protective sleeves by using a four-group spiral water channel partitioned reverse cooling design. It improves cooling efficiency and enhances structural durability, providing a reliable guarantee for the long-term high-temperature operation of the submerged arc furnace. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the present invention;

[0019] Figure 2 This is a top view of the present invention;

[0020] Figure 3 This is a bottom view of the present invention;

[0021] Figure 4 This is a cross-sectional view of the present invention;

[0022] Figure 5 This is a structural diagram of the inner sleeve of this utility model.

[0023] In the picture:

[0024] 1. Outer sleeve; 2. Inner sleeve; 3. Upper sealing plate; 4. Lower sealing plate; 5. Guide plate; 6. First water channel; 7. Second water channel; 8. Third water channel; 9. Fourth water channel; 10. Inlet pipe; 11. Outlet pipe; 12. Hanging rod. Detailed Implementation

[0025] Combination Figures 1 to 5 Further description of a spiral water circuit protective sleeve for a submerged arc furnace according to this utility model:

[0026] like Figure 1 , Figure 2As shown, the spiral water channel protective sleeve consists of an outer sleeve 1 and an inner sleeve 2 arranged coaxially. The outer sleeve 1 and the inner sleeve 2 are respectively rolled and welded from a single piece of steel plate, and both are hollow cylinders. The inner sleeve 2 is located inside the outer sleeve 1. The upper and lower ends of the outer sleeve 1 and the inner sleeve 2 are sealed by welding with an upper sealing plate 3 and a lower sealing plate 4, respectively, forming an annular cooling cavity.

[0027] like Figure 4 , Figure 5 As shown, four guide plates 5 are welded onto the inner sleeve 2, and all four guide plates 5 are spiral in shape. The four spiral guide plates 5 are welded and fixed to the outer wall of the inner sleeve 2 at equal angular intervals and abut against the inner wall of the outer sleeve 1 (a gas tightness test and water pressure test must be performed before use to ensure that the seal is intact before it can be put into use; alternatively, the guide plates can be welded to the inner wall of the outer sleeve). This divides the annular cooling chamber into independent first water channel 6, second water channel 7, third water channel 8, and fourth water channel 9. The guide plates 5 are made of high-temperature and corrosion-resistant materials, such as nickel-based alloys and reaction-sintered silicon carbide ceramics. Their spiral structure enhances the overall mechanical strength and increases the contact area of ​​the cooling water.

[0028] like Figure 2 , Figure 3 , Figure 4 As shown, the bottom of the first water channel 6, the second water channel 7, the third water channel 8, and the fourth water channel 9 are all equipped with inlet pipes 10, and the top is equipped with an outlet pipe 11. Both the inlet pipe 10 and the outlet pipe 11 are fixed to the inner wall of the inner sleeve 2, and one end of each extends to the upper exterior of the inner sleeve 2. This design achieves a reverse flow of cooling water, with the water entering from a low position and exiting from a high position, ensuring that the water flow fully covers the spiral channel formed by the first water channel 6, the second water channel 7, the third water channel 8, and the fourth water channel 9, thereby enhancing heat exchange efficiency.

[0029] like Figure 1 As shown, multiple hanger rods 12 are welded equidistantly along the axial direction on the surface of the upper sealing plate 3. The upper ends of the hanger rods 12 are connected to the furnace body lifting flange of the electric arc furnace by bolts and insulating sleeves. In use, cooling water is introduced into the inlet pipe 10 from the first water channel 6, the second water channel 7, the third water channel 8, and the fourth water channel 9, respectively, and rises along the channel formed by the spiral guide plate 5. The water flow fully absorbs the heat transferred from the electric arc furnace to the inner sleeve 2 in the spiral path, and finally exits from the outlet pipe 11. The four independent water channels design avoids short-circuiting of the water flow and ensures uniform cooling.

[0030] Working principle and process of this utility model:

[0031] I. Structural Composition and Principle

[0032] The main frame is composed of an outer sleeve 1 and an inner sleeve 2 forming a coaxial cylinder, with an annular cooling cavity between them. The upper and lower ends are sealed by an upper sealing plate 3 and a lower sealing plate 4.

[0033] The spiral divider consists of four spiral guide plates 5 welded at equal angles to the outer wall of the inner sleeve 2 and abutting against the inner wall of the outer sleeve 1, dividing the annular cooling cavity into four independent spiral channels, namely the first water channel 6, the second water channel 7, the third water channel 8, and the fourth water channel 9.

[0034] The cooling water achieves efficient heat exchange through multi-channel counter-current flow. Each water path has an independent inlet pipe 10 at the bottom, through which cooling water enters four spiral channels. Guided by the spiral guide plate 5, the water flows spirally upward from bottom to top (this can be achieved by a pump or by injecting pressure into the water pipe), extending the contact time between the cooling water and the high-temperature inner sleeve 2. The cooled water, after absorbing heat, is discharged from the outlet pipe 11 at the top of each water path, forming a "low inlet, high outlet" counter-current flow pattern.

[0035] II. Work Process

[0036] 1. Installation and fixing: The protective cover is suspended at the designated position of the electric arc furnace by the hanging rod 12 of the upper sealing plate 3.

[0037] 2. Cooling water injection: Cooling water is simultaneously injected from the four inlet pipes 10 into the corresponding independent water circuits.

[0038] 3. Heat exchange: As the water flows up along the spiral channel, it fully absorbs the heat transferred from the electric arc furnace to the inner sleeve 2; the spiral structure increases the contact area of ​​the water flow and improves the heat conduction efficiency.

[0039] 4. Heat dissipation: The heated cooling water flows into the external circulation system through the outlet pipe 11.

Claims

1. A spiral water circuit protective sleeve for a submerged arc furnace, comprising an outer sleeve (1) and an inner sleeve (2), wherein both the outer sleeve (1) and the inner sleeve (2) are hollow cylinders and the inner sleeve (2) is located inside the outer sleeve (1), and the upper and lower ends of the outer sleeve (1) and the inner sleeve (2) are respectively connected to an upper sealing plate (3) and a lower sealing plate (4), characterized in that, It also includes guide plates (5), which are provided in four spiral shape and coiled on the inner sleeve (2). The annular cooling cavity between the outer sleeve (1) and the inner sleeve (2) is divided into a first water channel (6), a second water channel (7), a third water channel (8) and a fourth water channel (9) by the four guide plates (5).

2. The protective sleeve as described in claim 1, characterized in that, The bottom of the first waterway (6), the second waterway (7), the third waterway (8) and the fourth waterway (9) are all provided with inlet pipes (10), and the top of the first waterway (6), the second waterway (7), the third waterway (8) and the fourth waterway (9) are all provided with outlet pipes (11).

3. The protective sleeve as described in claim 2, characterized in that, The ends of the inlet pipe (10) and the outlet pipe (11) both extend to the outside of the upper end of the inner sleeve (2).

4. The protective sleeve as described in claim 1, characterized in that, The upper sealing plate (3) is provided with multiple hanging rods (12) at equal intervals along its axial direction.

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