Novel copper protection screen for submerged arc furnace

Abstract

The utility model relates to a novel copper protection screen for a submerged arc furnace, which comprises at least one copper protection screen unit, and is characterized in that the copper protection screen unit comprises an inner lining plate and at least one cooling copper pipe, the inner lining plate is arc-shaped, the cooling copper pipe is formed by bending a copper pipe, and a water inlet and a water outlet are respectively arranged at two ends of the cooling copper pipe. Each cooling copper pipe is connected with the outer arc surface of the inner lining plate; and a plurality of anchoring parts are arranged on the outer wall of the cooling copper pipe. The novel copper protection screen for the submerged arc furnace is simple in manufacturing process, light in weight, low in manufacturing cost and capable of greatly reducing the risk of water leakage of a welding seam.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling equipment for high-temperature smelting furnaces, in particular to a new type of copper protection screen for submerged arc furnaces. Background Art

[0002] The submerged arc furnace, also known as an electric arc furnace, is mainly used for producing ferroalloys, industrial silicon, calcium carbide, yellow phosphorus and other products, and is also commonly called an electric furnace in this industry. The protection screen is one of the main components of the electrode holder, and is mainly used to separate the external high-temperature gas from entering the electrode holder.

[0003] The existing protection screens mainly include three types: steel protection screens, cast copper protection screens, and forged copper protection screens. Steel protection screens have poor cooling effects, many welds and are prone to water leakage, and their service life is not good; cast copper protection screens have casting defects such as loose internal structure, pores, slag inclusions and cracks, and the cavity structure is prone to bulging; although the forged copper protection screen has a better service life, the copper weight is heavy, and its manufacturing process is complex and the cost is high, which is restricted in actual application and promotion. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a new type of copper protection screen for submerged arc furnaces. This new type of copper protection screen for submerged arc furnaces has a simple manufacturing process, a light weight, a low manufacturing cost, and can greatly reduce the risk of weld water leakage. The adopted technical solution is as follows:

[0005] A new type of copper protection screen for submerged arc furnaces includes at least one copper protection screen unit, and is characterized in that: the copper protection screen unit includes a lining plate and at least one cooling copper tube. The lining plate is arc-shaped, the cooling copper tube is formed by bending a copper tube, and water inlets and water outlets are respectively arranged at both ends of the cooling copper tube. Each cooling copper tube is connected to the outer arc surface of the lining plate; a plurality of anchor fittings are arranged on the outer wall of the cooling copper tube.

[0006] The above-mentioned copper protection screen for submerged arc furnaces is generally of a cylindrical structure. At present, the cylindrical structure copper protection screen is formed by enclosing a plurality of identical copper protection screen units in a cylindrical shape, or can also be formed by enclosing a plurality of copper protection screen units with different central angles in a cylindrical shape, or can also be composed of a lining plate in a cylindrical shape and one copper protection screen unit to form a copper protection screen for submerged arc furnaces. The outer arc surface of the above-mentioned lining plate is the hot surface, and the inner arc surface of the lining plate is the cold surface.

[0007] Generally, the main body of the cooling copper tube is arranged on the outer arc surface of the lining plate. The main body of the cooling copper tube refers to the main part of the cooling copper tube except for the parts near the water inlet and the water outlet at both ends.

[0008] During cooling, water is passed through the interior of the cooling copper tube for cooling, and the anchor itself transfers heat to the cooling copper tube through heat conduction. The heat generated by the external high-temperature gas is absorbed by the refractory material, and the refractory material transfers the heat to the cooling copper tube and the anchor through heat conduction, and then the heat is carried away by the cooling water flowing inside the cooling copper tube.

[0009] The above-mentioned anchor is manufactured by machining or additive manufacturing. The above-mentioned anchor is used to fix the refractory material. Usually, the refractory material is poured on the outer arc surface of the inner lining plate so that the refractory material covers the anchor and the cooling copper tube (the water inlet and outlet at both ends of the cooling copper tube are exposed outside the refractory material).

[0010] The cooling copper tube can also be a commercially available pressed or drawn copper tube, which is bent on a pipe bending device as required to form the cooling copper tube.

[0011] The above-mentioned cooling copper tube can be formed by the following preparation process: adding copper materials (such as electrolytic copper) to an industrial frequency furnace for melting, pouring the high-temperature copper water into a mold of a crystallizer, and after cooling, it becomes a copper round billet of a specified size; by extruding, drawing or continuous extrusion of the copper round billet, a copper tube of a specified size is made; the copper tube is bent on a pipe bending device as required to form the cooling copper tube. This kind of cooling copper tube can be mass-produced, with a simple process and high production efficiency. Its material is dense, and there are no casting defects such as loose internal structure, pores, slag inclusions and cracks. It has high mechanical strength and hardness and has good wear resistance.

[0012] In a preferred embodiment, the inner end of each of the anchors is connected to the outer wall of the cooling copper tube.

[0013] In a further preferred embodiment, each of the anchors is welded (such as riveting welding, etc.) to the outer wall of the cooling copper tube. Through this setting, the connection strength between the anchor and the cooling copper tube can be improved, and the cooling performance of the anchor can be increased. Between two adjacent anchors on the same cooling copper tube, there is usually a gap.

[0014] In a preferred embodiment, the shape of the anchor is V-shaped or Y-shaped. Of course, the shape of the above-mentioned anchor can also be other shapes.

[0015] In a preferred embodiment, the inner lining plate has two opposite vertical sides, and both vertical sides are formed into strip-shaped pieces by bending. A plurality of first through holes are provided on the strip-shaped pieces, and first locking bolts are installed in the first through holes. A first locking nut is installed on the rod portion of the first locking bolt; the strip-shaped pieces of two adjacent inner lining plates are stacked, and the rod portion of the first locking bolt sequentially passes through the corresponding first through holes on the two strip-shaped pieces, and the head of the first locking bolt and the first locking nut jointly clamp the two strip-shaped pieces.

[0016] In a preferred embodiment, the inner lining plate is a copper plate or a steel plate.

[0017] In a preferred embodiment, the cooling copper tube comprises a plurality of straight segments and a plurality of arc segments arranged alternately; among two adjacent straight segments, one end of a straight segment is integrally connected to one end of an arc segment, and the other end of the arc segment is integrally connected to one end of another straight segment.

[0018] In a preferred embodiment, the number of the cooling copper tubes is two or more. Generally, each cooling copper tube is arranged side by side on the hot surface of the inner lining plate. Each cooling copper tube is independently connected to cooling water, forming an independent water path with multiple inlets and multiple outlets. In the case where one of the cooling copper tubes is locally damaged and leaks, only the water path of this tube needs to be closed, and the remaining water paths can still work normally for heat conduction, and the copper protection screen can continue to be used.

[0019] In a preferred embodiment, the cross-sectional shape of the cooling copper tube is circular, square, elliptical, trapezoidal or triangular. Of course, the cross-sectional shape of the above-mentioned cooling copper tube can also be other shapes.

[0020] In a preferred embodiment, the material of the copper tube is pure copper or copper alloy. The above-mentioned copper alloy can be copper-chromium alloy or copper-zirconium alloy. The copper tube of this material has excellent thermal conductivity and good cooling effect. Multi-layer ribbed structures are provided on the outer walls of the water inlet and the water outlet of the above-mentioned cooling copper tube. By setting the multi-layer ribbed structures, it is convenient to connect and seal the water inlet and outlet ends of the cooling copper tube with the external rubber tube.

[0021] In a preferred embodiment, the copper protection screen unit further comprises a plurality of lifting lugs, and the lifting lugs are installed on the inner lining plate. The lifting lugs are used for hoisting the copper protection screen unit, which is convenient for the installation of the copper protection screen. The lifting lugs and the inner lining plate can be connected by bolts.

[0022] In a further preferred embodiment, the material of the lifting lug is steel.

[0023] Compared with the prior art, the present utility model has the following advantages:

[0024] (1) By adding anchor pieces on the outer wall of the cooling copper tube, the refractory material can be better fixed, and the heat conduction area of the cooling copper tube can be increased;

[0025] (2) By using the inner lining plate as the support of the cooling copper tube, each cooling copper tube can better maintain the stability of its shape and position, and ensure that the whole copper protection screen unit has a high overall strength;

[0026] (3) By using the cooling copper tube as the cooling water path, there is no weld in the middle of the whole cooling water path, greatly reducing the risk of weld leakage;

[0027] (4) The manufacturing process of the present utility model is simple, and only three main processes are required: bending the cooling copper tube, bending the inner lining plate, and welding the cooling copper tube on the inner lining plate;

[0028] (5) Compared with the solid forged copper protection screen, the copper protection screen unit of the present utility model adopts cooling copper tubes, which are light in weight, save copper materials, and greatly reduce the manufacturing cost. Description of the Drawings

[0029] Figure 1 is a schematic structural view of the copper protection screen unit in the embodiment of the present utility model;

[0030] Figure 2 is a schematic structural view of the copper protection screen forming a cylindrical structure in the present utility model;

[0031] Figure 3 is a top view of the refractory material covering the entire copper protection screen in the present utility model. Specific Embodiments

[0032] The following further describes in conjunction with the drawings and the preferred embodiments of the present utility model.

[0033] As Figures 1-3 shown, the new type of copper protection screen for submerged arc furnace in this embodiment includes two copper protection screen units 1. The copper protection screen unit 1 includes a lining plate 11 and four cooling copper tubes 12. The lining plate 11 is arc-shaped. The cooling copper tubes 12 are formed by bending copper tubes. Water inlets 121 and water outlets 122 are respectively provided at both ends of the cooling copper tubes 12. Each cooling copper tube 12 is connected to the outer arc surface of the lining plate 11; a plurality of anchor members 2 are provided on the outer wall of the cooling copper tube 12.

[0034] The above-mentioned copper protection screen for submerged arc furnace is generally of a cylindrical structure. Currently, the cylindrical copper protection screen is formed by enclosing two identical copper protection screen units 1 into a cylindrical shape. The outer arc surface of the above-mentioned lining plate 11 is the hot surface, and the inner arc surface of the lining plate 11 is the cold surface.

[0035] Usually, the main body of the cooling copper tube 12 is arranged on the outer arc surface of the lining plate 11. The main body of the cooling copper tube 12 refers to the main part of the cooling copper tube 12 except for the parts near the water inlets 121 and water outlets 122 at both ends.

[0036] During cooling, water is passed through the inside of the cooling copper tube 12 for cooling, and the anchor member 2 itself transfers heat to the cooling copper tube 12 through heat conduction. The heat generated by the external high-temperature gas is absorbed by the refractory material 3, and the refractory material 3 transfers heat to the cooling copper tube 12 and the anchor member 2 through heat conduction, and then the heat is carried away by the cooling water flowing inside the cooling copper tube 12.

[0037] The above-mentioned anchor member 2 is manufactured by machining or additive manufacturing. The above-mentioned anchor member 2 is used to fix the refractory material 3. Usually, the refractory material 3 is poured on the outer arc surface of the lining plate 11 so that the refractory material 3 covers the anchor member 2 and the cooling copper tube 12 (the water inlets 121 and water outlets 122 at both ends of the cooling copper tube 12 are exposed outside the refractory material 3).

[0038] The cooling copper tube 12 can also be a commercially available pressed or drawn copper tube, which is bent on a pipe bending device as required to form the cooling copper tube 12.

[0039] The above-mentioned cooling copper tube 12 can be formed by the following preparation process: adding copper materials (such as electrolytic copper) into an industrial frequency furnace for melting, pouring the high-temperature copper water into a mold of a crystallizer, and after cooling, it becomes a copper round billet with specified dimensions; by extruding, drawing or continuous extrusion of the copper round billet, a copper tube with specified dimensions is made; the copper tube is bent on a pipe bending device as required to form the cooling copper tube 12. This kind of cooling copper tube 12 can be mass-produced, with a simple process and high production efficiency. Its material is dense, and there are no casting defects such as loose internal structure, pores, slag inclusions and cracks. It has high mechanical strength and hardness, and has good wear resistance.

[0040] The inner ends of the respective anchor members 2 are connected to the outer wall of the cooling copper tube 12.

[0041] Each of the anchor members 2 is welded (such as rivet welding, etc.) to the outer wall of the cooling copper tube 12. Through this setting, the connection strength between the anchor member 2 and the cooling copper tube 12 can be improved, and the cooling performance of the anchor member 2 can be increased. On the same cooling copper tube 12, there is usually a gap between two adjacent anchor members 2.

[0042] The shape of the anchor member 2 is V-shaped. Of course, the shape of the above-mentioned anchor member 2 can also be other shapes.

[0043] The inner lining plate 11 has two opposite vertical sides 111. Both of the two vertical sides 111 are formed into strip-shaped pieces 112 by bending. A plurality of first through holes (not marked in the figure) are provided on the strip-shaped pieces 112. A first locking bolt 113 is installed in the first through hole. A first locking nut 114 is installed on the rod portion of the first locking bolt 113; the strip-shaped pieces 112 of two adjacent inner lining plates 11 are stacked. The rod portion of the first locking bolt 113 sequentially passes through the corresponding first through holes on the two strip-shaped pieces 112. The head of the first locking bolt 113 and the first locking nut 114 jointly clamp the two strip-shaped pieces 112.

[0044] The inner lining plate 11 is a copper plate or a steel plate.

[0045] The cooling copper tube 12 includes a plurality of straight segments 121 and a plurality of arc segments 122 arranged alternately; among two adjacent straight segments 121, one end of a straight segment 121 is integrally connected to one end of an arc segment 122, and the other end of the arc segment 122 is integrally connected to one end of the other straight segment 121.

[0046] The number of cooling copper tubes 12 is more than two. Generally, each cooling copper tube 12 is arranged side by side on the hot surface of the inner lining plate 11. Each cooling copper tube 12 independently passes cooling water to form an independent waterway with multiple inlets and multiple outlets. In the case where one of the cooling copper tubes 12 is locally burned out and leaks water, only this waterway needs to be closed, and the remaining waterways can still work normally for heat conduction, and the copper protection screen can continue to be used.

[0047] The cross-sectional shape of the cooling copper tube 12 is circular. Of course, the cross-sectional shape of the above-mentioned cooling copper tube 12 can also be other shapes.

[0048] The material of the copper tube is pure copper or copper alloy. The above-mentioned copper alloy can be copper-chromium alloy or copper-zirconium alloy. The copper tube of this material has excellent thermal conductivity and good cooling effect. Multi-layer ribbed structures 123 are provided on the outer walls of the water inlet 121 and the water outlet 122 of the above-mentioned cooling copper tube 12. By providing the multi-layer ribbed structures 123, it is convenient to connect and seal the inlet and outlet ends of the cooling copper tube 12 with the external rubber tube.

[0049] The copper protection screen unit 1 further includes a plurality of lifting lugs 4, and the lifting lugs 4 are installed on the inner lining plate 11. The lifting lugs 4 are used for hoisting the copper protection screen unit 1 to facilitate the installation of the copper protection screen. The lifting lugs 4 and the inner lining plate 11 can be connected by bolts. The material of the lifting lugs 4 is steel.

[0050] In addition, it should be noted that for the specific embodiments described in this specification, the names of their respective parts and the like can be different. Any equivalent or simple changes made according to the structure, features, and principles described in the inventive concept of the utility model patent are included in the protection scope of the utility model patent. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or use similar methods for substitution, as long as they do not deviate from the structure of the utility model or exceed the scope defined by this claim book, they should fall within the protection scope of the utility model.

Claims

1. A copper protection screen for a new type of submerged arc furnace, comprising at least one copper protection screen unit, characterized in that: The copper protection screen unit includes an inner lining plate and at least one cooling copper pipe. The inner lining plate is arc-shaped. The cooling copper pipe is formed by bending a copper pipe. Water inlets and water outlets are respectively arranged at two ends of the cooling copper pipe. Each cooling copper pipe is connected to the outer arc surface of the inner lining plate; a plurality of anchor fittings are arranged on the outer wall of the cooling copper pipe.

2. The copper protection screen for the new submerged arc furnace according to claim 1, characterized in that: The inner ends of each of the anchor fittings are connected to the outer wall of the cooling copper pipe.

3. The copper protection screen for the new submerged arc furnace according to claim 2, wherein: Each of the anchor fittings is welded to the outer wall of the cooling copper pipe.

4. The copper protection screen for the new submerged arc furnace as described in claim 1 is characterized in that: The shape of the anchor fitting is V-shaped or Y-shaped.

5. The copper protection screen for the new submerged arc furnace as described in claim 1 is characterized in that: The inner lining plate has two opposite vertical edges. Both vertical edges are formed into strip-shaped pieces through bending. A plurality of first through holes are arranged on the strip-shaped pieces. First locking bolts are installed in the first through holes. First locking nuts are installed on the rod parts of the first locking bolts; the strip-shaped pieces of adjacent two inner lining plates are stacked. The rod parts of the first locking bolts sequentially pass through the corresponding first through holes on the two strip-shaped pieces. The heads of the first locking bolts and the first locking nuts jointly clamp the two strip-shaped pieces.

6. The novel copper protection screen for submerged arc furnace according to claim 1, wherein: The inner lining plate is made of copper plate or steel plate.

7. The novel copper protection screen for submerged arc furnace according to claim 1, wherein: The cooling copper pipe includes a plurality of straight line segments and a plurality of arc segments arranged alternately; among adjacent two straight line segments, one end of a straight line segment is integrally connected to one end of an arc segment, and the other end of the arc segment is integrally connected to one end of the other straight line segment.

8. The copper protection screen for the new submerged arc furnace as described in claim 1, characterized in that: The number of the cooling copper pipes is more than two.

9. The novel copper protection screen for submerged arc furnace according to claim 1, wherein: The cross-sectional shape of the cooling copper pipe is circular, square, elliptical, trapezoidal or triangular.

10. The novel copper protection screen for submerged arc furnace according to claim 1, wherein: The material of the copper pipe is pure copper or copper alloy; The copper protection screen unit further includes a plurality of lifting lugs, and the lifting lugs are installed on the inner lining plate; The material of the lifting lug is steel.

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