Heating device of electric furnace for smelting

Abstract

The utility model relates to the technical field of smelting technology, in particular to a heating device of an electric furnace for smelting, which comprises a furnace body which is rotatably arranged, a furnace body cover plate which is arranged at the position of an opening of the furnace body, and an electric heating element which is arranged on the furnace body cover plate and is used for heating smelting materials in the furnace body, the electric heating element is an electromagnetic induction electric heating element, an annular groove used for containing the electromagnetic induction electric heating element is formed in the furnace body, and the electromagnetic induction electric heating element on the furnace body cover plate enters the annular groove. According to the electric furnace for smelting, rapid heating of the electric furnace for smelting is realized, and the heating efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of smelting technology, and particularly relates to a heating device for an electric furnace used in smelting. Background Art

[0002] The traditional ironmaking method is blast furnace ironmaking. During the reduction process of blast furnace ironmaking, when iron and oxygen in iron ore are separated, a considerable amount of elements such as Si, Mn, and C will also enter the molten iron. Therefore, the molten iron must be subjected to oxidative refining to remove excess elements and impurity elements. The refined molten steel also needs to be deoxidized, which complicates the smelting process, generates a large amount of polluting gases, and causes unnecessary energy and raw material consumption.

[0003] The recently developed short-process hydrogen-based shaft furnace-electric furnace smelting process uses a hydrogen-based shaft furnace for ironmaking, with hydrogen and coke oven gas as reducing agents. The iron in the iron ore particles is reduced in the shaft furnace and then put into an electric arc furnace for further smelting into steel. This short-process smelting process can greatly reduce energy consumption and has good environmental protection.

[0004] However, the above production line using a hydrogen-based shaft furnace-electric furnace currently has the disadvantage of large equipment investment. In addition, during the reduction of iron in the hydrogen-based shaft furnace, since the raw materials are in a stacked state in the shaft furnace, the flow of the gas in the furnace is not smooth, greatly reducing the uniformity of heat reception of the raw materials and the speed of the reduction reaction. The reduction reaction time is long and the production efficiency is not high.

[0005] Therefore, our company has developed an ironmaking reduction electric furnace, and the patents related to its technology include an electric furnace for smelting (CN220981908U), etc. The electric furnace for smelting includes a rotatably arranged furnace body, a furnace body cover plate arranged at the mouth position of the furnace body, a stirring shaft passing through the furnace body cover plate and inserted into the furnace body, and a stirring impeller arranged on the stirring shaft for stirring the discrete smelting materials inside the furnace body. A first fluid dynamic seal assembly is arranged between the furnace body cover plate and the mouth of the furnace body, a second fluid dynamic seal assembly is arranged between the insertion part of the stirring shaft on the furnace body cover plate and the stirring shaft, and an electric heating element for heating the smelting materials inside the furnace body is arranged on the side of the furnace body cover plate facing the inside of the furnace body. The ironmaking reduction electric furnace adopting this technical solution can improve the production efficiency of ironmaking reduction and has less equipment investment.

[0006] The above electric furnace for smelting also has the deficiency of a relatively slow initial heating speed. Therefore, it is necessary to improve the structure of the above electric furnace for smelting to solve the above problems. Summary of the Utility Model

[0007] To solve the above problems, the present utility model proposes a heating device for a smelting electric furnace, aiming to achieve rapid heating of the smelting electric furnace and improve the heating efficiency. The specific technical solutions are as follows:

[0008] A heating device for a smelting electric furnace, comprising a rotatably arranged furnace body, a furnace body cover plate arranged at the mouth position of the furnace body, and an electric heating element arranged on the furnace body cover plate for heating the smelting materials inside the furnace body. The electric heating element is an electromagnetic induction electric heating element. An annular groove for accommodating the electromagnetic induction electric heating element is formed on the furnace body, and the electromagnetic induction electric heating element on the furnace body cover plate enters into the annular groove.

[0009] Preferably, a layer of magnetic heat-resistant lining plate is arranged on the inner wall of the furnace body.

[0010] Preferably, the magnetic heat-resistant lining plate is a graphite lining plate.

[0011] Preferably, the graphite lining plate in the present utility model is used as a wearing part of the smelting electric furnace. The carbon element contained in the graphite lining plate is beneficial to promoting the reduction of iron ore materials in the furnace, thereby further improving the efficiency of the iron-smelting reduction electric furnace.

[0012] Preferably, the furnace body comprises a furnace body shell and a refractory material layer arranged inside the furnace body shell. The annular groove is arranged on the refractory material layer, and the magnetic heat-resistant lining plate is arranged on the inner wall of the refractory material layer.

[0013] Preferably, the electromagnetic induction electric heating element comprises a spiral copper tube that enters into the annular groove of the furnace body and is fixedly connected to the furnace body cover plate. Both ends of the spiral copper tube are connected to an electromagnetic induction heating power supply.

[0014] In the present utility model, a cooling water inlet and a cooling water outlet are arranged at both ends of the spiral copper tube, and the spiral copper tube is connected to a cooling water circulating water supply system through the cooling water inlet and the cooling water outlet.

[0015] As a further improvement of the present utility model, magnetic conduction rings are sleeved on the spiral copper tube in sequence and adjacent to each other. A magnetic ring opening is arranged on the magnetic conduction ring to form the non-closed magnetic conduction ring, and the magnetic ring openings of each magnetic conduction ring face the side direction of the magnetic heat-resistant lining plate, so as to form an electromagnetic induction directional heating magnetic path between the magnetic conduction ring and the magnetic heat-resistant lining plate.

[0016] Preferably, the magnetic conduction ring is a U-shaped magnetic conduction ring, and the U-shaped opening of the U-shaped magnetic conduction ring faces the side direction of the magnetic heat-resistant lining plate.

[0017] Preferably, the magnetic conduction ring is a silicon steel sheet magnetic conduction ring.

[0018] Preferably, the magnetic conduction ring is fixed on the copper tube by a clamping method or an adhesive bonding method.

[0019] Preferably, the electric furnace for smelting is a reducing electric furnace for iron smelting. The reducing electric furnace for iron smelting includes a base, a pair of columns arranged on the base, a cross beam plate arranged on the pair of columns, the furnace body is rotatably arranged on the base, and the furnace body cover plate is connected to a position below the cross beam plate; a rotating disk driven by a reduction motor is arranged on the base, and the furnace body is installed on the rotating disk.

[0020] In the present utility model, a stirring device is arranged in the furnace body of the reducing electric furnace for iron smelting, and the structure of the stirring device is one of the following structures:

[0021] (1) The stirring device includes a stirring shaft rotatably arranged and stirring impellers arranged on the stirring shaft;

[0022] (2) The stirring device includes a stirring shaft fixedly arranged and turning plates arranged on the stirring shaft.

[0023] Preferably, the rotatably arranged stirring shaft is rotatably arranged on the furnace body cover plate through a bearing seat component, or is rotatably arranged on the cross beam plate through a bearing seat component and passes through the furnace body cover plate to enter the furnace body.

[0024] Preferably, the fixedly arranged stirring shaft is fixedly arranged on the furnace body cover plate, or is fixedly arranged on the cross beam plate and passes through the furnace body cover plate to enter the furnace body.

[0025] In the present utility model, a first fluid dynamic seal assembly is arranged between the furnace body cover plate and the furnace body.

[0026] Preferably, the first fluid dynamic seal assembly includes an annular water tank connected to the furnace body cover plate and an annular ring connected to the outer flange of the furnace body and inserted into the annular water tank.

[0027] Preferably, when the stirring shaft is a rotatably arranged stirring shaft, a second fluid dynamic seal assembly is arranged between the rotatably arranged stirring shaft and the furnace body cover plate.

[0028] Preferably, when the stirring shaft is a fixedly arranged stirring shaft, a sealing structure is arranged between the fixedly arranged stirring shaft and the furnace body cover plate.

[0029] Preferably, the sealing structure between the stirring shaft and the furnace body cover plate is a fluid static seal assembly.

[0030] Preferably, the second fluid dynamic seal assembly of the present utility model adopts the second fluid dynamic seal assembly in the original smelting electric furnace (CN220981908U).

[0031] Preferably, the second fluid dynamic seal assembly in the original smelting electric furnace (CN220981908U) can also be converted into the fluid static seal assembly in this embodiment.

[0032] In the present utility model, the smelting electric furnace is also provided with a gas separation and circulation device for treating the gas in the furnace body. The gas separation and circulation device includes a gas separation and circulation pipeline with both ends respectively communicating with the inside of the furnace body, and a gas separator arranged on the gas separation and circulation pipeline.

[0033] In the present utility model, the gas in the furnace body includes a first gas for participating in the smelting reaction and a second gas as smelting waste gas. The gas separation and circulation pipeline includes a gas collection pipeline and a gas reuse pipeline. The inlet of the gas collection pipeline communicates with the inside of the furnace body, the outlet of the gas collection pipeline is connected to the inlet of the gas separator, the gas separator is provided with a first gas separation port and a second gas separation port, the first gas separation port of the gas separator is connected to the inlet of the gas reuse pipeline, and the outlet of the gas reuse pipeline communicates with the inside of the furnace body.

[0034] In the present utility model, when the smelting electric furnace is used as an iron-smelting reduction electric furnace, the discrete smelting materials used are granular iron ore and a dispersed material of coke or coal; the first gas in the iron-smelting reduction electric furnace is carbon monoxide, the second gas is carbon dioxide, and the gas separator is a gas separator for separating carbon monoxide from the gas in the furnace body.

[0035] The beneficial effects of the present utility model are:

[0036] First, the heating device of a smelting electric furnace of the present utility model uses an electromagnetic induction heating element to heat the materials in the furnace body, with a fast heating speed and high heating efficiency, thereby improving the performance of the smelting electric furnace.

[0037] Second, the heating device of a smelting electric furnace of the present utility model movably inlays the spiral copper tube of the electromagnetic induction heating element in the annular groove opened on the furnace body, and arranges a layer of magnetically conductive and high-temperature resistant lining plate on the inner wall of the furnace body, realizing the heating of the magnetically conductive and high-temperature resistant lining plate by the electromagnetic induction heating element, and realizing the heating of the materials in the furnace body through the heating of the magnetically conductive and high-temperature resistant lining plate, further improving the efficiency and uniformity of electromagnetic induction heating.

[0038] Third, for the heating device of an electric furnace for smelting according to the present utility model, the magnetically conductive and high-temperature resistant lining plate adopts a graphite lining plate. While fully utilizing the magnetic conductivity of graphite to achieve electromagnetic induction heating, the carbon element contained in the graphite lining plate can also promote the reduction reaction of iron ore materials in the furnace, thereby further improving the efficiency of the iron-smelting reduction electric furnace.

[0039] Fourth, for the heating device of an electric furnace for smelting according to the present utility model, a magnetic conducting ring with a magnetic ring opening is sleeved on the outer circle of the spiral copper tube, which can guide the magnetic path of electromagnetic induction heating to concentrate on the magnetically conductive and high-temperature resistant lining plate on the inner wall of the furnace body, realizing directional electromagnetic induction heating, which is beneficial to reducing heat damage and improving the efficiency of electromagnetic induction heating. Brief Description of the Drawings

[0040] Figure 1 is a schematic structural diagram of the heating device of an electric furnace for smelting according to the present utility model;

[0041] Figure 2 is Figure 1 the schematic structural diagram of the heating device in

[0042] Figure 3 is to replace Figure 2 the rotatably arranged stirring shaft and stirring impeller in

[0043] with a fixedly arranged stirring shaft and turning plate;

[0044] In the figure: 1. Furnace body, 2. Furnace body cover plate, 3. Stirring shaft, 4. Stirring impeller, 5. First fluid dynamic seal assembly, 6. Second fluid dynamic seal assembly, 7. Electric heating element, 8. Gas separation and circulation device, 9. Gas separation and circulation pipeline, 10. Gas separator, 11. Gas collection pipeline, 12. Gas reuse pipeline, 13. Base, 14. Column, 15. Cross beam plate, 16. Rotary disk, 21. Bearing seat component, 22. Annular water tank, 23. Annular ring, 37. Feeding port, 38. Feeding cover, 40. Discharge door.

[0044] In the figure: 51. Annular groove, 52. Magnetically conductive and high-temperature resistant lining plate, 53. Furnace body shell, 54. Refractory material layer, 55. Spiral copper tube, 56. Cooling water inlet, 57. Cooling water outlet, 58. Magnetic conducting ring, 59. Magnetic ring opening, 60. Turning plate, 61. Outer flange of furnace body. Detailed Embodiment

[0045] The following further describes the specific embodiments of the present utility model in conjunction with the drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model and cannot be used to limit the protection scope of the present utility model.

[0046] As shown in Figures 1 to 3The figure shows an embodiment of a heating device for a smelting electric furnace of the present utility model, which includes a rotatably arranged furnace body 1, a furnace body cover plate 2 arranged at the mouth position of the furnace body 1, and an electric heating element 7 arranged on the furnace body cover plate 2 for heating the smelting materials inside the furnace body 1. The electric heating element 7 is an electromagnetic induction electric heating element. An annular groove 51 for accommodating the electromagnetic induction electric heating element 7 is formed on the furnace body 1, and the electromagnetic induction electric heating element 7 on the furnace body cover plate 2 enters into the annular groove 51.

[0047] Preferably, a layer of magnetically conductive and high-temperature resistant lining plate 52 is arranged on the inner wall of the furnace body 1.

[0048] Preferably, the magnetically conductive and high-temperature resistant lining plate 52 is a graphite lining plate.

[0049] Preferably, the graphite lining plate in this embodiment is used as a wearing part of the smelting electric furnace. The carbon element contained in the graphite lining plate is beneficial to promoting the reduction of iron ore materials in the furnace, thereby further improving the efficiency of the iron-smelting reduction electric furnace.

[0050] Preferably, the furnace body 1 includes a furnace body shell 53 and a refractory material layer 54 arranged inside the furnace body shell 53. The annular groove 51 is arranged on the refractory material layer 54, and the magnetically conductive and high-temperature resistant lining plate 52 is arranged on the inner wall of the refractory material layer 54.

[0051] Preferably, the electromagnetic induction electric heating element 7 includes a spiral copper tube 55 that enters the annular groove 51 of the furnace body 1 and is fixedly connected to the furnace body cover plate 2. Both ends of the spiral copper tube 55 are connected to an electromagnetic induction heating power supply (not shown in the figure).

[0052] In this embodiment, a cooling water inlet 56 and a cooling water outlet 57 are arranged at both ends of the spiral copper tube 55, and the spiral copper tube 55 is connected to a cooling water circulating water supply system through the cooling water inlet 56 and the cooling water outlet 57.

[0053] As a further improvement of this embodiment, magnetically conductive rings 58 are sleeved on the spiral copper tube 55 in sequence and adjacent to each other. A magnetic ring opening 59 is arranged on the magnetically conductive ring 58 to form the non-closed magnetically conductive ring 58, and the magnetic ring openings 59 of the magnetically conductive rings 58 face the side direction of the magnetically conductive and high-temperature resistant lining plate 52, so as to form an electromagnetic induction directional heating magnetic path between the magnetically conductive ring 58 and the magnetically conductive and high-temperature resistant lining plate 52.

[0054] Preferably, the magnetically conductive ring 58 is a U-shaped magnetically conductive ring, and the U-shaped opening of the U-shaped magnetically conductive ring 58 faces the side direction of the magnetically conductive and high-temperature resistant lining plate 52.

[0055] Preferably, the magnetically conductive ring 58 is a silicon steel sheet magnetically conductive ring.

[0056] Preferably, the magnetic conduction ring 58 is fixed on the copper tube by a clamping method or an adhesive bonding method.

[0057] Preferably, the electric furnace for smelting is a reducing electric furnace for iron smelting. The reducing electric furnace for iron smelting includes a base 13, a pair of columns 14 arranged on the base 13, and a cross beam plate 15 arranged on the pair of columns 14. The furnace body 1 is rotatably arranged on the base 13, and the furnace body cover plate 2 is connected to a position below the cross beam plate 15; a rotating disk 16 driven by a reduction motor is arranged on the base 13, and the furnace body 1 is installed on the rotating disk 16.

[0058] In this embodiment, a stirring device is arranged in the furnace body 1 of the reducing electric furnace for iron smelting, and the structure of the stirring device is one of the following structures:

[0059] (1) The stirring device includes a stirring shaft 3 arranged to rotate and stirring impellers 4 arranged on the stirring shaft 3;

[0060] (2) The stirring device includes a stirring shaft 3 arranged fixedly and turning plates 60 arranged on the stirring shaft 3.

[0061] Preferably, the stirring shaft 3 arranged to rotate is rotatably arranged on the furnace body cover plate 2 through a bearing seat component 21, or is rotatably arranged on the cross beam plate 15 through a bearing seat component 21 and passes through the furnace body cover plate 2 to enter the furnace body 1.

[0062] Preferably, the stirring shaft 3 arranged fixedly is fixedly arranged on the furnace body cover plate 2, or is fixedly arranged on the cross beam plate 15 and passes through the furnace body cover plate 2 to enter the furnace body 1.

[0063] In this embodiment, a first fluid dynamic seal assembly 5 is arranged between the furnace body cover plate 2 and the furnace body 1.

[0064] Preferably, the first fluid dynamic seal assembly 5 includes an annular water tank 22 connected to the furnace body cover plate 2 and an annular ring 23 connected to the outer flange 61 of the furnace body and inserted into the annular water tank 22.

[0065] Preferably, when the stirring shaft 3 is a stirring shaft arranged to rotate, a second fluid dynamic seal assembly 6 is arranged between the stirring shaft 3 arranged to rotate and the furnace body cover plate 3.

[0066] Preferably, when the stirring shaft 3 is a stirring shaft arranged fixedly, a sealing structure is arranged between the stirring shaft 3 arranged fixedly and the furnace body cover plate 2.

[0067] Preferably, the sealing structure between the stirring shaft 3 and the furnace body cover plate 2 is a hydrostatic seal assembly.

[0068] Preferably, the second fluid dynamic seal assembly 6 in this embodiment adopts the second fluid dynamic seal assembly in the original smelting electric furnace (CN220981908U).

[0069] Preferably, the second fluid dynamic seal assembly in the original smelting electric furnace (CN220981908U) can also be converted into the hydrostatic seal assembly in this embodiment.

[0070] In this embodiment, the smelting electric furnace is also equipped with a gas separation and circulation device 8 for treating the gas in the furnace body 1. The gas separation and circulation device 8 includes a gas separation and circulation pipeline 9 with both ends respectively communicating with the inside of the furnace body 1, and a gas separator 10 arranged on the gas separation and circulation pipeline 9.

[0071] In this embodiment, the gas in the furnace body 1 includes a first gas for participating in the smelting reaction and a second gas as smelting waste gas. The gas separation and circulation pipeline 9 includes a gas collection pipeline 11 and a gas reuse pipeline 12. The inlet of the gas collection pipeline 11 communicates with the inside of the furnace body 1, the outlet of the gas collection pipeline 12 is connected to the inlet of the gas separator 10. The gas separator 10 is provided with a first gas separation port and a second gas separation port. The first gas separation port of the gas separator 10 is connected to the inlet of the gas reuse pipeline 12, and the outlet of the gas reuse pipeline 12 communicates with the inside of the furnace body 1.

[0072] In this embodiment, when the smelting electric furnace is used as an iron smelting reduction electric furnace, the discrete smelting materials used are granular iron ore, and a dispersed material of coke or coal; the first gas in the iron smelting reduction electric furnace is carbon monoxide, the second gas is carbon dioxide, and the gas separator 10 is a gas separator 10 for separating carbon monoxide from the gas in the furnace body 1.

[0073] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A heating device for an electric furnace used in smelting, characterized in that, It includes a rotatably arranged furnace body, a furnace body cover plate arranged at the mouth position of the furnace body, and an electric heating element arranged on the furnace body cover plate for heating the smelting materials inside the furnace body. The electric heating element is an electromagnetic induction electric heating element. An annular groove for accommodating the electromagnetic induction electric heating element is formed on the furnace body, and the electromagnetic induction electric heating element on the furnace body cover plate enters into the annular groove.

2. The heating device of an electric furnace for smelting according to claim 1, characterized in that, A layer of magnetically conductive and high-temperature resistant lining plate is arranged on the inner wall of the furnace body.

3. The heating device of an electric furnace for smelting according to claim 2, characterized in that, The magnetically conductive and high-temperature resistant lining plate is a graphite lining plate.

4. The heating device of an electric furnace for smelting according to claim 2, characterized in that, The furnace body includes a furnace body shell and a refractory material layer arranged inside the furnace body shell. The annular groove is arranged on the refractory material layer, and the magnetically conductive and high-temperature resistant lining plate is arranged on the inner wall of the refractory material layer.

5. The heating device of an electric furnace for smelting according to claim 2, characterized in that, The electromagnetic induction electric heating element includes a spiral copper tube that enters into the annular groove of the furnace body and is fixedly connected to the furnace body cover plate. Both ends of the spiral copper tube are connected to an electromagnetic induction heating power supply. A cooling water inlet and a cooling water outlet are arranged at both ends of the spiral copper tube, and the spiral copper tube is connected to a cooling water circulating water supply system through the cooling water inlet and the cooling water outlet.

6. The heating device of an electric furnace for smelting according to claim 5, characterized in that, A magnetically conductive ring is sleeved on the spiral copper tube in sequence and adjacent to each other. A magnetic ring opening is arranged on the magnetically conductive ring to form the non-closed magnetically conductive ring, and the magnetic ring openings of each magnetically conductive ring face the side of the magnetically conductive and high-temperature resistant lining plate, so as to form an electromagnetic induction directional heating magnetic path between the magnetically conductive ring and the magnetically conductive and high-temperature resistant lining plate.

7. The heating device of an electric furnace for smelting according to claim 1, characterized in that, The smelting electric furnace is an iron-smelting reduction electric furnace. The iron-smelting reduction electric furnace includes a base, a pair of columns arranged on the base, and a cross beam plate arranged on the pair of columns. The furnace body is rotatably arranged on the base, and the furnace body cover plate is connected to the lower position of the cross beam plate. A rotating disk driven by a reduction motor is arranged on the base, and the furnace body is installed on the rotating disk.

8. The heating device of an electric furnace for smelting according to claim 7, characterized in that, A stirring device is arranged inside the furnace body of the iron-smelting reduction electric furnace. The structure of the stirring device is as follows: The stirring device includes a rotatably arranged stirring shaft and stirring impellers arranged on the stirring shaft; alternatively, the stirring device includes a fixedly arranged stirring shaft and turning plates arranged on the stirring shaft.

9. The heating device of an electric furnace for smelting according to claim 1, wherein A first fluid dynamic seal assembly is arranged between the furnace body cover plate and the furnace body.

10. The heating device of an electric furnace for smelting according to claim 1, characterized in that, The smelting electric furnace is also equipped with a gas separation and circulation device for treating the gas inside the furnace body. The gas separation and circulation device includes a gas separation and circulation pipeline with both ends respectively communicated with the inside of the furnace body and a gas separator arranged on the gas separation and circulation pipeline.

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