Novel copper-steel composite protection screen for submerged arc furnace

Abstract

A novel copper-steel composite protection screen for a submerged arc furnace comprises a plurality of protection screen units which are sequentially connected to form a cylindrical structure. The protection screen unit comprises a protection screen unit body, a cooling water channel is arranged in the protection screen unit body, a water inlet and a water outlet are formed in the two ends of the cooling water channel respectively, a water inlet pipe is installed on the water inlet, and a water outlet pipe is installed on the water outlet. The protection screen unit is characterized in that the protection screen unit body comprises an outer side copper plate and an inner side steel plate arranged on the inner side face of the outer side copper plate, and the inner side steel plate is tightly combined with the outer side copper plate. The advantages of copper and steel can be exerted to the maximum extent, the strong cooling performance is met, the overall mechanical strength of a product can be improved, the deformation resistance can be enhanced, and the service life can be prolonged. Compared with an existing copper protection screen, the overall mechanical strength and deformation resistance can be improved, consumption of copper materials can be reduced, the material cost is effectively reduced, and therefore the overall manufacturing cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of ore heating furnace, concretely relates to a novel copper steel composite protection screen for ore heating furnace. BACKGROUND

[0002] The protection screen is an important cooling element of the ore heating furnace and is an annular cooling device for protecting the holding system under the electrode. The protection screen is located outside the pressure ring and copper tile, and its main function is to protect the normal operation between the pressure ring, copper tile and electrode, block the direct radiation of the high-temperature material surface to the internal components, and prevent the flame from directly burning the outer surface of the pressure ring and copper tile when the material surface is ignited, thereby forming a protective barrier.

[0003] In addition to using steel, some copper parts are used in the material of the existing protection screen of the ore heating furnace. For example, the prior art of the protection screen of the ore heating furnace disclosed in the patent CN102958214B comprises at least two protection screen components, the protection screen components are sequentially connected and form a cylinder, each protection screen component is made of an integral copper plate, and at least one water channel is formed in the copper plate. Although the protection screen made of copper has high heat conduction performance and good cooling performance, the strength and rigidity of the copper material are low. Moreover, the working environment outside the protection screen is extremely harsh, and the protection screen is constantly eroded by high-temperature harmful smoke, a strong magnetic field and a high-temperature radiation of 1000-1400 DEG C of the material surface. The conventional copper protection screen has a wall thickness of 55-80 mm and a height of 1500-3000 mm, and belongs to a "high and thin" structure. During continuous operation for many years, the copper protection screen is deformed due to the influence of the harsh environment. Moreover, the copper material is expensive, and the cost of the copper protection screen is very high. SUMMARY

[0004] The utility model wants to solve the technical problem to provide a novel copper steel composite protection screen for ore heating furnace, and the novel copper steel composite protection screen for ore heating furnace has strong cooling performance and high overall mechanical strength, is favorable for prolonging the service life, and has low manufacturing cost. The technical scheme adopted is as follows:

[0005] A novel copper steel composite protection screen for ore heating furnace comprises a plurality of protection screen units, the plurality of protection screen units are sequentially connected to form a cylindrical structure, each protection screen unit comprises a protection screen unit body, a cooling water channel is arranged in the protection screen unit body, water inlets and water outlets are arranged at the two ends of the cooling water channel respectively, a water inlet pipe is arranged on the water inlet, and a water outlet pipe is arranged on the water outlet, characterized in that the protection screen unit body comprises an outer copper plate and an inner steel plate arranged on the inner side surface of the outer copper plate, and the inner steel plate is tightly combined with the outer copper plate.

[0006] The outer side of the protection screen unit is in a high-temperature environment, and the working environment is relatively poor, so the outer copper plate is arranged at the position, the copper material has excellent heat conduction capacity, heat can be quickly transferred to the cooling water flowing in the cooling water channel, and the cooling water is used to take away the heat, so that the protection screen has strong cooling performance; and the inner steel plate is arranged at the inner side of the protection screen unit, the steel material has excellent mechanical strength, the protection screen unit has high overall mechanical strength, and the deformation resistance is enhanced. Therefore, the novel copper-steel composite protection screen for the submerged arc furnace has strong cooling performance, high overall mechanical strength, and strong deformation resistance, so as to prolong the service life.

[0007] The composite mode between the inner steel plate and the outer copper plate can be welding, mechanical coupling or metallurgical bonding.

[0008] In the preferred mode, the inner side of the outer copper plate is provided with an inner steel plate mounting groove capable of accommodating the inner steel plate, and the inner steel plate is arranged in the inner steel plate mounting groove.

[0009] In the more preferred mode, the water inlet and the water outlet are opened on the top surface of the outer copper plate; the inner steel plate mounting groove is arranged at the middle and lower parts of the inner side of the outer copper plate. The water inlet and the water outlet are processed by retaining the overall copper material structure at the top of the outer copper plate, so that the water inlet and the water outlet have integrity, and when the water inlet pipe and the water outlet pipe are installed, the outer wall of the water inlet pipe and the inner wall of the water inlet, and the outer wall of the water outlet pipe and the inner wall of the water outlet are tightly matched.

[0010] In a preferred mode, the cooling water channel is arranged in the inner part of the outer copper plate.

[0011] In another preferred mode, the cooling water channel is arranged at the joint part of the inner steel plate and the outer copper plate. The cooling water channel is arranged at the joint part of copper and steel, so that the copper material can be further thinned, and the steel material is increased, so that the use amount of copper material is further reduced, and the material cost is reduced. The cooling water channel is arranged at the joint part of copper and steel, and there are two processing modes: one is to drill holes after the copper plate and the steel plate are combined; the other is to process part of the water channel on the copper plate and the steel plate respectively, and then combine in position.

[0012] The cross-sectional shape of the cooling water channel can be a single circular hole, a double circular hole, or a composite hole type composed of a plurality of intersecting circular holes, or other hole types.

[0013] In the preferred embodiment, the cooling water channel is connected by a plurality of water channel segments, which are formed in the protective screen unit body by drilling. Generally, the protective screen unit body is arc-shaped, and the transverse water channel segments are also arc-shaped; the transverse linear water channel segments can be formed in the copper plate or copper-steel composite plate by drilling, and then the linear water channel segments are formed into arc-shaped transverse water channel segments when the copper plate or copper-steel composite plate is bent into an arc shape.

[0014] The copper material for making the outer copper plate can be pure copper or copper alloy. In the preferred embodiment, the outer copper plate is made of forged copper plate or rolled copper plate.

[0015] The steel material for making the inner steel plate can be carbon steel, alloy steel or stainless steel.

[0016] In the preferred embodiment, the new copper-steel composite protective screen for the electric arc furnace comprises 4-12 protective screen units, and the protective screen units are of the same specification.

[0017] In the new copper-steel composite protective screen for the electric arc furnace, the outer copper plate has excellent heat conduction performance, can rapidly transfer heat to the cooling water in the cooling water channel, and is taken away by the cooling water, thereby having strong cooling performance and realizing rapid cooling of the protective screen units; on this basis, the inner steel plate and the bottom steel plate have excellent mechanical strength, can improve the mechanical strength of the protective screen units and the entire protective screen, and enhance the deformation resistance of the protective screen. Therefore, the protective screen is formed by copper-steel composite, which can maximize the advantages of copper and steel, meets the strong cooling performance, improves the overall mechanical strength of the product, enhances the deformation resistance, and is beneficial to prolong the service life.

[0018] Compared with the existing copper protective screen, the new copper-steel composite protective screen for the electric arc furnace can not only improve the overall mechanical strength and deformation resistance, but also reduce the consumption of copper material and effectively reduce the material cost, thereby reducing the overall manufacturing cost. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view (perspective view) of the protective screen unit in the preferred embodiment 1 of the utility model;

[0020] Figure 2 is Figure 1 a top view of the protective screen unit in the preferred embodiment 1 of the utility model;

[0021] Figure 3 is Figure 2 an A-A sectional view of the preferred embodiment 1 of the utility model;

[0022] Figure 4 is a structural schematic view (perspective view) of the protective screen unit in the preferred embodiment 2 of the utility model;

[0023] Figure 5 isFigure 4 E-direction view of the protection screen unit;

[0024] Figure 6 is a B-B sectional view of Figure 5

[0025] Figure 7 is a C-C sectional view of Figure 5

[0026] Figure 8 is a structural schematic view (perspective view) of the protection screen unit in the preferred embodiment 3 of the present application;

[0027] Figure 9 is a D-D sectional view of Figure 8 DETAILED DESCRIPTION

[0028] Embodiment 1, the novel copper-steel composite protection screen for the electric arc furnace in the present embodiment comprises a plurality of (for example, 8) protection screen units 1, which are sequentially connected to form a cylindrical structure. The protection screen units 1 are of the same specification.

[0029] As shown in Figures 1-3 , the protection screen unit 1 comprises a protection screen unit body 11, wherein a cooling water passage 12 is arranged in the protection screen unit body 11, and an inlet 13 and an outlet 14 are arranged at two ends of the cooling water passage 12 respectively, an inlet pipe 15 is arranged on the inlet 13, and an outlet pipe 16 is arranged on the outlet 14; the protection screen unit body 11 comprises an outer copper plate 111 and an inner steel plate 112 arranged on the inner side of the outer copper plate 111, and the inner steel plate 112 is tightly combined with the outer copper plate 111.

[0030] The composite mode between the inner steel plate 112 and the outer copper plate 111 can adopt various modes such as welding, mechanical coupling or metallurgical combination.

[0031] In the present embodiment, the cooling water passage 12 is arranged inside the outer copper plate 111. The inlet 13 and the outlet 14 are opened on the top surface of the outer copper plate 111.

[0032] The cross-sectional shape of the cooling water passage 12 can be a single circular hole; can also be a double circular hole, or a composite hole type composed of a plurality of intersecting circular holes, or other hole types.

[0033] ​​​In this embodiment, the cooling water channel 12 is connected by multiple water channel segments (for example, four vertical water channel segments 121, 122, 123, 124 and three horizontal water channel segments 125, 126, 127); the vertical water channel segments 121, 122, 123, 124 and the horizontal water channel segments 125, 127 are formed by drilling in the outer copper plate 111. The protective screen unit body 11 is arc-shaped, and the horizontal water channel segments 125, 127 are also arc-shaped. When processing the horizontal water channel segments 125, 127, straight-line horizontal water channel segments can be first formed by drilling in the outer copper plate 111, and then when the copper plate or copper-steel composite plate is bent into an arc shape, the straight-line horizontal water channel segments are bent into arc-shaped horizontal water channel segments. The horizontal water channel segment 126 includes a strip-shaped water passage 1261 provided on the top surface of the outer copper plate 111, and the two ends of the bottom of the strip-shaped water passage 1261 are in communication with the upper end of the vertical water channel segment 122 and the upper end of the vertical water channel segment 123, respectively; the top of the strip-shaped water passage 1261 is provided with a cover plate 1262 which seals the strip-shaped water passage 1261.

[0034] The copper material used to make the outer copper plate 111 can be pure copper or copper alloy. The steel material used to make the inner steel plate 112 can be carbon steel, alloy steel or stainless steel.

[0035] Cooling water is supplied to the cooling water channel 12 from the water inlet pipe 15 and the water inlet 13, and the cooling water carries away the heat of the protective screen unit body 11 to cool the protective screen unit body 11, and then flows out from the water outlet 14 and the water outlet pipe 16.

[0036] Embodiment 2, as shown in Figures 4-7 the difference between this embodiment and embodiment 1 is that the cooling water channel 12 is arranged at the joint 113 of the inner steel plate 112 and the outer copper plate 111; the inner side of the outer copper plate 111 is provided with an inner steel plate mounting groove 114 capable of accommodating the inner steel plate 112 (the inner steel plate mounting groove 114 is arranged at the middle and lower parts of the inner side of the outer copper plate 111), and the inner steel plate 112 is arranged in the inner steel plate mounting groove 114.

[0037] The cooling water channel is arranged at the joint of copper and steel, and there are two processing methods: one is to drill after the copper plate and the steel plate are combined; the other is to process part of the water channel on the copper plate and the steel plate respectively, and then combine them in position.

[0038] The remaining structure of this embodiment is referred to embodiment 1.

[0039] Embodiment 3, as shown in Figures 8-9 the difference between this embodiment and embodiment 1 is that the inner side of the outer copper plate 111 is provided with an inner steel plate mounting groove 114 capable of accommodating the inner steel plate 112 (the inner steel plate mounting groove 114 is arranged at the middle and lower parts of the inner side of the outer copper plate 111), and the inner steel plate 112 is arranged in the inner steel plate mounting groove 114.

[0040] The remaining structure of this embodiment is as in Example 1.

Claims

1. A novel copper-steel composite protective screen for a submerged arc furnace, comprising multiple protective screen units connected sequentially to form a cylindrical structure; each protective screen unit includes a protective screen unit body, the protective screen unit body having a cooling water channel, with an inlet and an outlet at each end of the cooling water channel, an inlet pipe installed on the inlet, and an outlet pipe installed on the outlet, characterized in that: The protective screen unit body includes an outer copper plate and an inner steel plate disposed on the inner side of the outer copper plate, with the inner steel plate tightly bonded to the outer copper plate.

2. The novel copper-steel composite protective screen for submerged arc furnaces according to claim 1, characterized in that: The inner side of the outer copper plate is provided with an inner steel plate mounting groove that can accommodate the inner steel plate, and the inner steel plate is located in the inner steel plate mounting groove.

3. The novel copper-steel composite protective screen for submerged arc furnaces according to claim 2, characterized in that: The inlet and outlet are located on the top surface of the outer copper plate; the inner steel plate mounting groove is located in the middle and lower part of the inner side of the outer copper plate.

4. The novel copper-steel composite protective screen for submerged arc furnaces according to any one of claims 1-3, characterized in that: The cooling water channel is located inside the outer copper plate.

5. The novel copper-steel composite protective screen for submerged arc furnaces according to any one of claims 1-3, characterized in that: The cooling water channel is located at the junction of the inner steel plate and the outer copper plate.

6. The novel copper-steel composite protective screen for submerged arc furnaces according to any one of claims 1-3, characterized in that: The cooling water channel is composed of multiple waterway segments connected together, and the waterway segments are formed in the protective screen unit body by drilling.

7. The novel copper-steel composite protective screen for submerged arc furnaces according to any one of claims 1-3, characterized in that: The copper material used to make the outer copper plate is pure copper or a copper alloy.

8. The novel copper-steel composite protective screen for submerged arc furnaces according to any one of claims 1-3, characterized in that: The steel used to make the inner steel plate is carbon steel, alloy steel, or stainless steel.

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