Copper bottom ring for submerged arc furnace

Abstract

The utility model discloses a copper bottom ring for a submerged arc furnace, which comprises a copper bottom ring body and is characterized by further comprising two cover plates. The copper bottom ring body is an arc-shaped copper bottom ring body formed by bending a square copper pipe; square openings communicated with an inner cavity of the square copper pipe are formed in the two ends of the square copper pipe respectively, and the two cover plates are installed in the corresponding square openings respectively and seal the square openings. A cooling channel is arranged in an inner cavity of the square copper pipe, a water inlet hole and a water outlet hole are formed in the cold face of the square copper pipe, and the water inlet hole and the water outlet hole are both communicated with the cooling channel. The copper bottom ring for the submerged arc furnace is good in mechanical performance and heat conduction performance, high in use reliability, low in manufacturing cost and easy to apply and popularize.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgical electric furnace equipment, in particular to a copper bottom ring for a submerged arc furnace. Background Art

[0002] Submerged arc furnace is also called electric arc furnace, which is mainly used to produce ferroalloy, industrial silicon, calcium carbide, yellow phosphorus and other products. It is also commonly known as electric furnace in this industry. The bottom ring is one of the key components of the electrode holder, which is used to protect other components of the electrode holder, so that the bottom of the protective screen and contact element is not damaged by high-temperature flue gas, and isolate the high-temperature flue gas from entering the electrode holder to avoid damaging the conductive tube, contact element and other components inside the electrode holder.

[0003] There are two types of existing bottom rings of submerged arc furnaces: one is a cast copper bottom ring; the other is a forged copper bottom ring.

[0004] The cast copper bottom ring is made by direct casting or pre-buried copper tube casting. The cast copper bottom ring has material defects that cannot be fundamentally eliminated during the casting process (for example, there is loose casting structure, pores, slag inclusions and cracks inside the copper bottom ring, etc.), and the cast copper bottom ring body has poor mechanical properties and poor thermal conductivity. The bottom ring formed by pre-buried copper tube casting is prone to varying degrees of air gap thermal resistance inside because the pure copper matrix and the pre-buried copper tube are not completely fused, resulting in reduced thermal conductivity of the overall component. In a high-temperature working environment, the bottom ring is prone to thermal deformation. These casting defects expand with the occurrence of deformation, seriously affecting the reliability of the bottom ring.

[0005] The forged copper bottom ring is made of forged copper plate, which is drilled with deep holes to form cooling water channels (the holes are usually drilled from the side, bottom or outer arc surface), welded with plugs, cover plates and inlet and outlet water pipes on the top surface after bending the plate. The welds produced when welding the plugs on this forged copper bottom ring are exposed to high temperature environment for a long time. During use, cracks occasionally appear in the welds, causing water leakage. Moreover, although this forged copper bottom ring solves the various defects of the cast copper bottom ring, its manufacturing process is complicated and the manufacturing cost is high, which is limited in practical application and promotion. In addition, the forged copper bottom ring uses a solid copper plate, which is heavy and has a high material cost. Utility Model Content

[0006] The problem to be solved by the utility model is to provide a copper bottom ring for a submerged arc furnace. The copper bottom ring for a submerged arc furnace has good mechanical properties and thermal conductivity and low manufacturing cost.

[0007] In order to solve the above technical problems, the technical solutions adopted by the utility model are as follows:

[0008] A copper bottom ring for an electric arc furnace comprises a copper bottom ring body, characterized in that it also comprises two cover plates; the copper bottom ring body is an arc-shaped copper bottom ring body formed by bending a square copper tube; both ends of the square copper tube are respectively provided with square openings connected to the inner cavity of the square copper tube, and the two cover plates are respectively installed in the corresponding square openings and close the square openings; a cooling channel is provided in the inner cavity of the square copper tube, and a water inlet hole and a water outlet hole are provided on the cold surface of the square copper tube, and the water inlet hole and the water outlet hole are both connected to the cooling channel.

[0009] Usually, the side of the copper bottom ring body facing the furnace cavity of the submerged arc furnace is the hot side (facing downward), and the side facing away from the furnace cavity of the submerged arc furnace is the cold side (facing upward).

[0010] The above-mentioned square copper tube refers to a copper tube whose outer edge and inner edge of the cross section are both square (rectangular) in shape.

[0011] The above-mentioned arc-shaped copper bottom ring body: the corresponding central angle can be up to 360 degrees, that is, a circular ring.

[0012] The square copper tube is made by extrusion, drawing or continuous extrusion process. The square copper tube has high mechanical strength, high hardness, good thermal conductivity, good wear resistance, and dense material. There are no casting defects such as loose internal structure, pores, slag inclusions and cracks. The air gap thermal resistance caused by incomplete fusion during the buried tube casting process is eliminated, and it has good cooling effect and longer service life. This copper bottom ring for submerged arc furnace uses a square copper tube with a cavity structure, which can greatly reduce the overall weight and cost of the copper bottom ring body after processing, and is easier to promote and apply.

[0013] In a preferred embodiment, the copper bottom ring for the electric arc furnace further includes at least one arc-shaped partition, which is located in the inner cavity of the square copper tube and is integrally connected to the inner cavity of the square copper tube; the inner wall of the square copper tube, the cover plate and the arc-shaped partitions together form the cooling channel. The arc-shaped partitions mainly play the role of diversion and partition. The inner cavity of the square copper tube is divided into the required water-passing routes by the arc-shaped partitions as needed, and then the cooling channel is formed by the inner wall of the square copper tube and the cover plate, which can make the cooling more intensive and uniform.

[0014] In another preferred embodiment, the copper bottom ring for the submerged arc furnace also includes at least one arc partition; the position corresponding to the arc partition in the inner cavity of the square copper tube is provided with an upper arc positioning groove and a lower arc positioning groove arranged opposite to each other; the opening of the upper arc positioning groove faces downward, the shape contour of the upper arc positioning groove is the same as the shape contour of the upper edge of the corresponding arc partition, the opening width of the upper arc positioning groove matches the thickness of the upper edge of the corresponding arc partition, and the upper edge of the arc partition is in the corresponding upper arc positioning groove; the opening of the lower arc positioning groove faces upward, the shape contour of the lower arc positioning groove is the same as the shape contour of the lower edge of the corresponding arc partition, the opening width of the lower arc positioning groove matches the thickness of the lower edge of the corresponding arc partition, and the lower edge of the arc partition is in the corresponding lower arc positioning groove; the inner wall of the square copper tube, the cover plate and each arc partition together form the cooling channel. The waterway design of inlaying the arc partition in the upper arc positioning groove and the lower arc positioning groove is simple to process and reduces the amount of welding.

[0015] In a further preferred embodiment, the end of the arc-shaped partition is welded to the inner wall of the square copper tube. By this arrangement, the misalignment of the arc-shaped partition can be reduced as much as possible or even avoided.

[0016] In a further preferred embodiment, the copper bottom ring for the submerged arc furnace further includes a water outlet partition plate, the number of the arc partition plates is two, the two ends of the arc partition plates on the inner side of the square copper tube respectively have a first water flow gap with the corresponding cover plate, the inner end of the water outlet partition plate is welded or integrally connected to the edge of one end of the arc partition plates on the inner side of the square copper tube, the edge of the water outlet partition plate is tightly matched or welded with the inner wall of the square copper tube, the water outlet partition plate separates a cover plate from one end of the arc partition plates on the outer side of the square copper tube, the water outlet partition plate and one end of the arc partition plates on the outer side of the square copper tube have a second water flow gap, and the other end of the arc partition plates on the outer side of the square copper tube is tightly matched with the corresponding cover plate. The above-mentioned definition of inside and outside: the side close to the center of the copper bottom ring body is the inside, and the side away from the center of the copper bottom ring body is the outside. Through this arrangement, the cavity of the square copper tube is divided into a cooling channel that extends back and forth inside and outside the square copper tube, the water inlet hole is at one end of the cooling channel, and the water outlet hole is at the other end of the cooling channel. The two arc-shaped partitions divide the inner cavity of the square copper tube into a cooling channel that extends back and forth inside and outside the square copper tube, reducing the cross-sectional area of ​​the cooling water passing through the channel, ensuring a faster flow rate and reducing the cooling water vortex dead water area, making it less prone to scaling, achieving better use effects, and being able to better extend the service life of the copper bottom ring.

[0017] In a further preferred embodiment, the arc-shaped partition is made of copper, copper alloy or steel, and the steel may be carbon steel or stainless steel.

[0018] In a preferred embodiment, the edge of the cover plate is connected to the edge of the square opening by an annular weld. Before the annular weld is formed, it is necessary to remove impurities such as scale, oil stains, etc. around the edge of the cover plate and the edge of the square opening. The above welding is generally performed by arc welding or laser welding.

[0019] In a preferred embodiment, a water inlet pipe and a water outlet pipe are welded on the square copper tube, the lower end interface of the water inlet pipe is connected to the water inlet hole, and the lower end interface of the water outlet pipe is connected to the water outlet hole. Usually, the materials of the water inlet pipe and the water outlet pipe are stainless steel, copper or copper alloy. The pre-processed water inlet pipe is assembled and welded to the water inlet hole, and the pre-processed water outlet pipe is assembled and welded to the water outlet hole.

[0020] In a further preferred embodiment, the water inlet pipe and the water outlet pipe both include an upper steel pipe and a lower copper pipe, the lower end interface of the upper steel pipe is welded to the upper end interface of the lower copper pipe, and the lower end interface of the lower copper pipe constitutes the lower end interface of the water inlet pipe and the water outlet pipe. The water inlet and outlet pipes adopt a copper-steel butt joint structure, which can facilitate the welding of the external steel pipe on site with the upper end interface of the upper steel pipe.

[0021] In a preferred embodiment, a plurality of lifting ears are provided on the cold surface of the square copper tube, and a lifting hole is provided on the top of each lifting ear. The bottom of the lifting ear can be connected to the cold surface of the square copper tube by welding, or can be connected to the cold surface of the square copper tube by the cooperation of bolts and screw holes, or can be connected to the cold surface of the square copper tube in one piece. The lifting ears are provided on the cold surface of the copper bottom ring body, and the copper bottom ring body can be lifted up more conveniently through the lifting holes. In a more preferred embodiment, the material of the lifting ears is stainless steel.

[0022] In a preferred embodiment, the square copper tube and the cover plate are made of pure copper or copper alloy. The copper alloy may be copper-chromium alloy, copper-zirconium alloy or copper-silver alloy. The copper bottom ring body and the cover plate made of pure copper or copper alloy have excellent thermal conductivity, which can improve the cooling effect and thus extend the service life of the copper bottom ring.

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

[0024] The copper bottom ring for the electric arc furnace has good mechanical properties and thermal conductivity, high reliability in use, low manufacturing cost, and is easier to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a specific embodiment 1 of the utility model;

[0026] Figure 2 It is a schematic diagram of the flow direction of water in the cooling channel in the specific embodiment 1 of the utility model;

[0027] Figure 3It is a cross-sectional view of the cooling channel in the specific embodiment 1 of the utility model;

[0028] Figure 4 It is a structural schematic diagram of a square copper tube in a specific embodiment 1 of the utility model;

[0029] Figure 5 It is a structural schematic diagram of the arc-shaped partition in the specific embodiment 1 of the utility model;

[0030] Figure 6 It is a cross-sectional view of the arc-shaped copper bottom ring body in the specific embodiment 1 of the utility model. DETAILED DESCRIPTION

[0031] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Example 1

[0033] As shown in Figures 1-6, the copper bottom ring for the electric arc furnace in this embodiment includes a copper bottom ring body 1 and two cover plates 2; the copper bottom ring body 1 is an arc-shaped copper bottom ring body 1 formed by bending a square copper tube 3; both ends of the square copper tube 3 are respectively provided with square openings 31 connected to the inner cavity of the square copper tube 3, and the two cover plates 2 are respectively installed in the corresponding square openings 31 and close the square openings 31; a cooling channel 32 is provided in the inner cavity of the square copper tube 3, and a water inlet hole 33 and a water outlet hole 34 are provided on the cold surface 11 of the square copper tube 3, and the water inlet hole 33 and the water outlet hole 34 are both connected to the cooling channel 32.

[0034] Usually, the side of the copper bottom ring body 1 facing the furnace cavity of the submerged arc furnace is a hot side (facing downward), and the side facing away from the furnace cavity of the submerged arc furnace is a cold side 11 (facing upward).

[0035] The square copper tube 3 is a copper tube whose outer edge and inner edge are both in a square (rectangular) shape.

[0036] The arc-shaped copper bottom ring body 1 has a corresponding central angle of up to 360 degrees, that is, a circular ring.

[0037] The square copper tube 3 is made by extrusion, drawing or continuous extrusion process. The square copper tube 3 has high mechanical strength, high hardness, good thermal conductivity, good wear resistance, and dense material. There are no casting defects such as loose internal structure, pores, slag inclusions and cracks. The air gap thermal resistance caused by incomplete fusion during the buried pipe casting process is eliminated, and it has good cooling effect and longer service life. The copper bottom ring for the submerged arc furnace adopts a square copper tube 3 with a cavity structure, which can greatly reduce the overall weight and cost of the copper bottom ring body 1 after processing, and is easier to promote and apply.

[0038] The copper bottom ring for the electric arc furnace in this embodiment also includes at least one arc-shaped partition plate 4; an upper arc-shaped positioning groove 35 and a lower arc-shaped positioning groove 36 which are arranged opposite to each other in the inner cavity of the square copper tube 3 at a position corresponding to the arc-shaped partition plate 4; the opening of the upper arc-shaped positioning groove 35 faces downward, and the shape contour of the upper arc-shaped positioning groove 35 is the same as the shape contour of the upper edge of the corresponding arc-shaped partition plate 4, the opening width of the upper arc-shaped positioning groove 35 matches the thickness of the upper edge of the corresponding arc-shaped partition plate 4, and the upper edge of the arc-shaped partition plate 4 is in the corresponding upper arc-shaped positioning groove 35; the opening of the lower arc-shaped positioning groove 36 faces upward, and the shape contour of the lower arc-shaped positioning groove 36 is the same as the shape contour of the lower edge of the corresponding arc-shaped partition plate 4, the opening width of the lower arc-shaped positioning groove 36 matches the thickness of the lower edge of the corresponding arc-shaped partition plate 4, and the lower edge of the arc-shaped partition plate 4 is in the corresponding lower arc-shaped positioning groove 36; the inner wall of the square copper tube 3, the cover plate 2 and each arc-shaped partition plate 4 together form the cooling channel 32. The water channel design of embedding the arc-shaped partition plate 4 in the upper arc-shaped positioning groove 35 and the lower arc-shaped positioning groove 36 is simple to process and reduces the amount of welding.

[0039] The end of the arc-shaped partition plate 4 is welded to the inner wall of the square copper tube 3. Through this arrangement, the misalignment of the arc-shaped partition plate 4 can be reduced as much as possible or even avoided.

[0040] The copper bottom ring for the electric arc furnace in this embodiment also includes a water outlet partition plate 5, the number of the arc partition plates 4 is two, and the two ends of the arc partition plates 4 on the inner side of the square copper tube 3 are respectively provided with a first water flow gap 37 with the corresponding cover plate 2, the inner end of the water outlet partition plate 5 is welded to the edge of one end of the arc partition plate 4 on the inner side of the square copper tube 3, the edge of the water outlet partition plate 5 is tightly matched with the inner wall of the square copper tube 3, the water outlet partition plate 5 separates a cover plate 2 from one end of the arc partition plate 4 on the outer side of the square copper tube 3, and there is a second water flow gap 38 between the water outlet partition plate 5 and one end of the arc partition plate 4 on the outer side of the square copper tube 3, and the other end of the arc partition plate 4 on the outer side of the square copper tube 3 is tightly matched with the corresponding cover plate 2. The above definition of inside and outside: the side close to the center of the copper bottom ring body 1 is the inside, and the side away from the center of the copper bottom ring body 1 is the outside. Through this arrangement, the cavity of the square copper tube 3 is divided into a cooling channel 32 that extends back and forth inside and outside the square copper tube 3, the water inlet 33 is located at one end of the cooling channel 32, and the water outlet 34 is located at the other end of the cooling channel 32. The two arc-shaped partitions 4 divide the inner cavity of the square copper tube 3 into a cooling channel 32 that extends back and forth inside and outside the square copper tube 3, reducing the cross-sectional area of ​​the cooling water passing through the channel, ensuring a faster flow rate and reducing the cooling water vortex dead water area, not easy to scale, better use effect, and can better extend the service life of the copper bottom ring.

[0041] The material of the arc-shaped partition plate 4 is copper, copper alloy or steel. The steel can be carbon steel or stainless steel.

[0042] The edge of the cover plate 2 is connected to the edge of the square opening 31 through an annular weld. Before the annular weld is formed, it is necessary to remove impurities such as scale, oil stains, etc. around the edge of the cover plate 2 and the edge of the square opening 31. The above welding is generally performed by arc welding or laser welding.

[0043] The square copper tube 3 is welded with an inlet pipe 6 and an outlet pipe 7. The lower end interface of the inlet pipe 6 is connected to the water inlet hole 33, and the lower end interface of the outlet pipe 7 is connected to the water outlet hole 34. Usually, the materials of the inlet pipe 6 and the outlet pipe 7 are stainless steel, copper or copper alloy. The pre-processed inlet pipe 6 and the water inlet hole 33 are assembled and welded into one body, and the pre-processed outlet pipe 7 and the water outlet hole 34 are assembled and welded into one body.

[0044] The water inlet pipe 6 and the water outlet pipe 7 both include an upper steel pipe 61 and a lower copper pipe 62. The lower end interface of the upper steel pipe 61 is welded to the upper end interface of the lower copper pipe 62, and the lower end interface of the lower copper pipe 62 constitutes the lower end interface of the water inlet pipe 6 and the water outlet pipe 7. The water inlet and outlet pipes 7 adopt a copper-steel butt joint structure, which can facilitate the welding of the external steel pipe on site with the upper end interface of the upper steel pipe 61.

[0045] A plurality of lifting ears 8 are provided on the cold surface 11 of the square copper tube 3, and a lifting hole 81 is provided on the top of each lifting ear 8. The bottom of the lifting ear 8 can be connected to the cold surface 11 of the square copper tube 3 by welding, or can be connected to the cold surface 11 of the square copper tube 3 by the cooperation of bolts and screw holes, or can be connected to the cold surface 11 of the square copper tube 3 in one piece. The lifting ears 8 are provided on the cold surface 11 of the copper bottom ring body 1, and the copper bottom ring body 1 can be lifted up more conveniently through the lifting holes 81. In a more preferred embodiment, the material of the lifting ears 8 is stainless steel.

[0046] Usually, the square copper tube 3 and the cover plate 2 are made of pure copper or copper alloy. The copper alloy can be copper-chromium alloy, copper-zirconium alloy or copper-silver alloy. The copper bottom ring body 1 and the cover plate 2 made of pure copper or copper alloy have excellent thermal conductivity, which can improve the cooling effect, thereby extending the service life of the copper bottom ring.

[0047] Example 2

[0048] The copper bottom ring for the submerged arc furnace in this embodiment is different from that in Embodiment 1 in that:

[0049] The copper bottom ring for the submerged arc furnace in this embodiment also includes at least one arc partition 4, which is located in the inner cavity of the square copper tube 3 and is integrally connected to the inner cavity of the square copper tube 3; the inner wall of the square copper tube 3, the cover plate 2 and each arc partition 4 together form the cooling channel 32. The arc partition 4 mainly plays the role of diversion and partition. The inner cavity of the square copper tube 3 is divided into the required water passage route by the arc partition 4 as needed, and then the cooling channel 32 is formed by the inner wall of the square copper tube 3 and the cover plate 2, which can make the cooling more intensive and uniform.

[0050] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different, and any equivalent or simple changes made based on the structure, features and principles described in the utility model patent concept are included in the protection scope of the utility model patent. The technical personnel of the technical field to which the utility model belongs can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A copper bottom ring for a submerged arc furnace, comprising a copper bottom ring body, characterized in that: It also includes two cover plates; the copper bottom ring body is an arc-shaped copper bottom ring body formed by bending a square copper tube; both ends of the square copper tube are respectively provided with square openings connected to the inner cavity of the square copper tube, and the two cover plates are respectively installed in the corresponding square openings and close the square openings; a cooling channel is provided in the inner cavity of the square copper tube, and a water inlet hole and a water outlet hole are provided on the cold surface of the square copper tube, and the water inlet hole and the water outlet hole are both connected to the cooling channel.

2. The copper bottom ring for a submerged arc furnace according to claim 1, characterized in that: It also includes at least one arc-shaped partition, which is located in the inner cavity of the square copper tube and is integrally connected to the inner cavity of the square copper tube; the inner wall of the square copper tube, the cover plate and the arc-shaped partitions together form the cooling channel.

3. The copper bottom ring for a submerged arc furnace according to claim 1, characterized in that: It also includes at least one arc-shaped partition; an upper arc-shaped positioning groove and a lower arc-shaped positioning groove are arranged opposite to each other in the inner cavity of the square copper tube at a position corresponding to the arc-shaped partition; the opening of the upper arc-shaped positioning groove faces downward, the shape profile of the upper arc-shaped positioning groove is the same as the shape profile of the upper edge of the corresponding arc-shaped partition, the opening width of the upper arc-shaped positioning groove matches the thickness of the upper edge of the corresponding arc-shaped partition, and the upper edge of the arc-shaped partition is located in the corresponding upper arc-shaped positioning groove; The opening of the lower arc-shaped positioning groove faces upward, the shape contour of the lower arc-shaped positioning groove is the same as the shape contour of the lower edge of the corresponding arc-shaped partition, the opening width of the lower arc-shaped positioning groove matches the thickness of the lower edge of the corresponding arc-shaped partition, and the lower edge of the arc-shaped partition is in the corresponding lower arc-shaped positioning groove; the inner wall of the square copper tube, the cover plate and the arc-shaped partitions together form the cooling channel.

4. The copper bottom ring for a submerged arc furnace according to claim 3, characterized in that: The end of the arc-shaped partition is welded to the inner wall of the square copper tube.

5. The copper bottom ring for a submerged arc furnace according to claim 3, characterized in that: It also includes a water outlet partition plate, wherein there are two arc-shaped partition plates, and both ends of the arc-shaped partition plates on the inner side of the square copper tube respectively have a first water flow gap with the corresponding cover plate, the inner end of the water outlet partition plate is welded or integrally connected to the edge of one end of the arc-shaped partition plate on the inner side of the square copper tube, the edge of the water outlet partition plate is tightly matched or welded to the inner wall of the square copper tube, the water outlet partition plate separates a cover plate from one end of the arc-shaped partition plate on the outer side of the square copper tube, a second water flow gap is provided between the water outlet partition plate and one end of the arc-shaped partition plate on the outer side of the square copper tube, and the other end of the arc-shaped partition plate on the outer side of the square copper tube is tightly matched with the corresponding cover plate.

6. The copper bottom ring for a submerged arc furnace according to claim 2 or 3, characterized in that: The arc-shaped partition is made of copper, copper alloy or steel.

7. The copper bottom ring for a submerged arc furnace according to claim 1, characterized in that: The edge of the cover plate is connected to the edge of the square opening through an annular weld.

8. The copper bottom ring for a submerged arc furnace according to claim 1, characterized in that: A water inlet pipe and a water outlet pipe are welded on the square copper tube, the lower end interface of the water inlet pipe is communicated with the water inlet hole, and the lower end interface of the water outlet pipe is communicated with the water outlet hole.

9. The copper bottom ring for a submerged arc furnace according to claim 8, characterized in that: The water inlet pipe and the water outlet pipe both include an upper steel pipe and a lower copper pipe. The lower end interface of the upper steel pipe is welded to the upper end interface of the lower copper pipe, and the lower end interface of the lower copper pipe constitutes the lower end interface of the water inlet pipe and the water outlet pipe.

10. The copper bottom ring for a submerged arc furnace according to claim 1, characterized in that: The cold surface of the square copper tube is provided with a plurality of lifting ears, and the top of each lifting ear is provided with a lifting hole; The square copper tube and the cover plate are made of pure copper or copper alloy.

Images