Electromagnetic induction smelting furnace and steel smelting heating system and method

Abstract

The invention discloses an electromagnetic induction smelting furnace and a steel smelting heating system and method.The electromagnetic induction smelting furnace comprises a furnace lining used for containing smelted furnace charge, and the furnace lining is in a barrel shape with an upward opening; the induction coil sleeves the radial outer side of the furnace lining and is used for introducing induction current to generate an induced magnetic field; the plurality of magnet yoke columns are uniformly distributed on the radial periphery of the induction coil so as to form a squirrel-cage-shaped structure; and the magnetic conductive disc is located below the bottom of the furnace lining, and the periphery of the magnetic conductive disc is connected with the magnetic yoke columns so that the magnetic conductive disc and the magnetic yoke columns can form a magnetic conductive path. The heating device has the advantage of being high in heating efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of smelting furnaces, and in particular, to an electromagnetic induction smelting furnace, a steel smelting heating system and a method. Background Art

[0002] The electromagnetic induction melting furnace is a kind of equipment which utilizes the principle of electromagnetic induction to melt metals. It is mainly composed of a power supply, an induction coil, a furnace body, a furnace lining and a control system. The induction coil and the squirrel-cage yoke column outside the induction coil constitute the electromagnetic system and magnetic circuit structure of the electromagnetic induction melting furnace.

[0003] However, the above magnetic circuit structure has the problem of poor magnetic circuit sealing, which makes the heating efficiency of the electromagnetic induction melting furnace low. Summary of the invention

[0004] The embodiments of the present application provide an electromagnetic induction melting furnace and a heating method thereof, which have the advantage of high heating efficiency.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0006] According to a first aspect of an embodiment of the present application, an electromagnetic induction melting furnace is provided, comprising:

[0007] The furnace lining is used to place the smelting charge and is in the shape of a barrel with the opening upward;

[0008] The induction coil is sleeved on the radial outer side of the furnace lining and is used to introduce an induced current to generate an induced magnetic field;

[0009] A plurality of magnetic yoke columns are evenly distributed on the radial periphery of the induction coil to form a squirrel cage structure;

[0010] The magnetic conductive disk is located below the bottom of the furnace substrate, and its outer periphery is connected to each of the magnetic yoke columns to form a magnetic conductive path with the magnetic yoke columns.

[0011] In some embodiments of the present application, based on the aforementioned solution, the outer diameter of the magnetic conductive disk is less than or equal to the inner diameter of the bottom of the furnace lining cavity.

[0012] In some embodiments of the present application, based on the aforementioned scheme, the yoke column is L-shaped consisting of a vertical section and a horizontal section, the vertical section is distributed along the axial direction of the furnace lining, the horizontal section is distributed along the radial direction of the furnace lining, the horizontal section is located below the bottom of the furnace lining, the end of the horizontal section is connected to the magnetic conductive disk, the thickness of the horizontal section is smaller than the thickness of the magnetic conductive disk, and the lower bottom surface of the magnetic conductive disk is flush with the lower bottom surface of the yoke column.

[0013] In some embodiments of the present application, based on the aforementioned scheme, the yoke column is formed by stacking magnetic steel sheets, the stacking direction of the magnetic steel sheets is the tangent direction of the cross-sectional circle of the positioned furnace lining, the plane of the magnetic steel sheet is perpendicular to the cross-sectional circle of the positioned furnace lining, and is parallel to the normal direction of the cross-sectional circle of the positioned furnace lining, and the magnetic disc is made of isotropic magnetic material with an iron loss value lower than a preset value.

[0014] In some embodiments of the present application, based on the above solution, it also includes:

[0015] The magnetic conductive ring is installed above the plurality of magnetic yoke columns and connected to the upper ends of the plurality of magnetic yoke columns. The material of the magnetic conductive ring is the same as that of the magnetic conductive disk.

[0016] According to the second aspect of the present application, a steel smelting and heating system is provided, comprising an electromagnetic induction smelting furnace and a steel charge connecting section, wherein the steel charge connecting section is installed above the electromagnetic induction smelting furnace, and the lower end of the steel charge connecting section is sealed and docked with the electromagnetic induction smelting furnace for caching, preheating and continuous downward delivery of the steel charge, and a reversible grate is installed at the lower part of the steel charge connecting section for supporting and lowering the steel charge.

[0017] In some embodiments of the present application, based on the aforementioned solution, it also includes an independent steel charge preheating section, which is connected to the steel charge connecting section and is used for preheating, conveying and hot charging of the steel charge.

[0018] In some embodiments of the present application, based on the aforementioned scheme, it also includes an openable and closable molten iron discharge channel and an openable and closable slag discharge channel, wherein the openable and closable molten iron discharge channel and the openable and closable slag discharge channel pass through the outer periphery of the furnace lining from the inner cavity of the furnace lining, and are used to lead out the molten steel or molten iron and slag after smelting.

[0019] According to a third aspect of the present application, a steel smelting heating method is provided, comprising:

[0020] Preheating the steel charge to be melted in the steel charge connecting section to a preset temperature, wherein the preset temperature is lower than the Curie temperature of the ferromagnetic material of the steel charge;

[0021] transporting the preheated steel charge from the steel charge connecting section to the electromagnetic induction melting furnace;

[0022] Starting the electromagnetic induction melting furnace to melt the steel charge;

[0023] After smelting is completed, the slag is discharged, followed by the molten steel or iron.

[0024] In some embodiments of the present application, based on the aforementioned scheme, the steel smelting and heating method is continuous smelting within a preset period.

[0025] The beneficial effects of this application are as follows:

[0026] The magnetic disc and each of the magnetic yoke columns constitute a magnetic conductive path. The magnetic disc closes the magnetic circuit below the furnace lining, so that the magnetic circuit of the present application has better closure and higher heating efficiency. In addition, since the main component of the steel charge is a ferromagnetic material composed of iron and iron oxide, it has the properties of ferromagnetic materials. The temperature of the steel charge in the steel charge connection section is controlled to be lower than the Curie temperature of the ferromagnetic material, so that it still has good magnetic conductivity and is used as part of the magnetic circuit of the electromagnetic system of the electromagnetic induction melting furnace, so that the heating efficiency is further improved.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0029] Figure 1 A schematic cross-sectional view of a side structure of an existing electromagnetic induction melting furnace is shown;

[0030] Figure 2 A cross-sectional schematic diagram showing a top view of the structure of an existing electromagnetic induction melting furnace;

[0031] Figure 3 A schematic diagram of an electromagnetic induction melting furnace in an embodiment of the present application is shown;

[0032] Figure 4 A first front view of an electromagnetic induction melting furnace in an embodiment of the present application is shown;

[0033] Figure 5 Shows Figure 4 Schematic diagram of the cross section in the AA direction;

[0034] Figure 6 A second front view of an electromagnetic induction melting furnace in an embodiment of the present application is shown;

[0035] Figure 7 Shows Figure 6 A schematic cross-sectional view of the BB direction;

[0036] Figure 8 A simplified schematic diagram of an electromagnetic induction melting furnace in an embodiment of the present application is shown;

[0037] Fig. 9 Shows Figure 8 Schematic cross-sectional view of the CC direction;

[0038] Fig.10 A schematic diagram of a steel smelting heating system in an embodiment of the present application is shown;

[0039] Fig.11 The figure shows the variation trend of magnetic conductivity of ferromagnetic materials with temperature. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0042] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0043] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0044] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0045] Figure 1 A schematic cross-sectional view of the side structure of an existing electromagnetic induction melting furnace is shown. Figure 2 A cross-sectional schematic diagram showing a top view of the structure of an existing electromagnetic induction melting furnace is shown. Figure 1 and Figure 2 In the figure, 1 is a squirrel cage yoke column, 2 is a furnace lining, and 3 is an induction coil. For a better understanding of the embodiments of the present application, see Figure 1 and Figure 2 , the principle of the existing electromagnetic induction melting furnace is explained:

[0046] The furnace lining is used to place the smelting charge, and its upper end is open. The induction coil is set on the outside of the furnace lining, and the squirrel cage yoke column is set on the outside of the induction coil. Alternating current is passed through the induction coil to generate an alternating magnetic field. The squirrel cage yoke column is used to enhance the alternating magnetic field generated by the induction coil. Taking the right-handed induction coil as an example, the direction of the alternating magnetic field is: from bottom to top in the furnace lining, and from top to bottom in the squirrel cage yoke column. Figure 1 It can be seen that the alternating magnetic field Figure 1 The sealing performance of the middle area above and below the furnace lining is poor, which makes the heating efficiency of the existing electromagnetic induction melting furnace low.

[0047] Figure 3 A schematic diagram of an electromagnetic induction melting furnace in an embodiment of the present application is shown. Figure 4 A first front view of an electromagnetic induction melting furnace in an embodiment of the present application is shown. Figure 5 Shows Figure 4 Schematic diagram of the cross section in the AA direction, Figure 6 A second front view of an electromagnetic induction melting furnace in an embodiment of the present application is shown. Figure 7 Shows Figure 6 Schematic diagram of the cross section in the BB direction, Figure 8 A simplified schematic diagram of an electromagnetic induction melting furnace in an embodiment of the present application is shown. Fig. 9 Shows Figure 8 Schematic diagram of the cross section in the CC direction, Figures 3 to 9 In the figure, 2 is the furnace lining, 3 is the induction coil, 4 is the magnetic disk, 5 is the magnetic yoke column, 6 is the magnetic ring, 7 is the horizontal section, and 8 is the vertical section. Figures 3 to 9 , provides an electromagnetic induction melting furnace, which at least includes a furnace lining, an induction coil, a yoke column and a magnetic conductive disc, which are described in detail as follows:

[0048] The furnace lining is used to place the smelting charge. It is in the shape of a barrel with an opening upward. The furnace lining can be understood as a container for holding the charge when it is heated. The charge can be iron-containing raw materials, copper materials, or aluminum materials. The shape of the furnace lining is usually cylindrical;

[0049] An induction coil is sleeved on the radial outer side of the furnace lining and is used to introduce an induced current to generate an induced magnetic field. The induced current may be an alternating induced current, and the induced magnetic field may be an alternating magnetic field. The induction coil may be spirally sleeved on the outer side of the furnace lining, and its shape matches the shape of the furnace lining. For example, if the furnace lining is cylindrical, the induction coil is circular. The induction coil may be a hollow metal tube, such as a hollow copper tube. When the induction coil is a hollow metal tube, a coolant is passed into the induction coil to cool the induction coil.

[0050] A plurality of magnetic yoke columns are evenly distributed on the radial periphery of the induction coil to form a squirrel cage structure, which is used to enhance the induced magnetic field generated by the induction coil. The magnetic yoke columns are used as magnetic conduction paths to enhance the induced magnetic field generated by the induction coil.

[0051] The magnetic conductive disk is located below the bottom of the furnace lining, and its outer periphery is connected to each of the magnetic yoke columns to form a magnetic conductive path with the magnetic yoke columns. The magnetic conductive disk partially closes the magnetic field below the furnace lining, thereby improving the magnetic field sealing performance and making the heating efficiency of the electromagnetic induction melting furnace higher.

[0052] Specifically, the magnetic conductive disk and the magnetic yoke column can be directly connected, that is, the magnetic conductive disk and the magnetic yoke column are in contact connection, or they can be connected by a snap-on manner.

[0053] It can be understood that the present application describes the furnace lining, the induction coil, the magnetic yoke column and the magnetic conductive disk, and other components of the electromagnetic induction melting furnace can be the same as those of the existing electromagnetic induction melting furnace.

[0054] Optionally, the outer diameter of the magnetic conductive disk is smaller than or equal to the inner diameter of the bottom of the inner cavity of the furnace lining, so that the magnetic conductive path tends to the central area of ​​the furnace lining.

[0055] Optionally, the magnetic disk and the furnace lining are coaxially distributed, see Figure 3 The axial direction of the magnetic disk and the furnace lining is Figure 3 Up and down direction.

[0056] Optionally, the yoke column is L-shaped consisting of a vertical section and a horizontal section, and the vertical section is distributed along the axial direction of the furnace lining, that is, Figure 8 In the up and down direction, the horizontal sections are distributed radially along the furnace lining, that is, Figure 8In the left and right directions, the horizontal section is located below the bottom of the furnace lining, the end of the horizontal section is connected to the magnetic disk, the thickness of the horizontal section is less than the thickness of the magnetic disk, the lower bottom surface of the magnetic disk and the lower bottom surface of the yoke column are arranged flush, so that the magnetic circuit in the middle area below the furnace lining extends upward, further guiding the magnetic field to the middle of the furnace lining, and the thickness direction of the horizontal section and the thickness direction of the magnetic disk are Figure 8 In the up and down direction, the bottom surface of the magnetic disk is Figure 8 The lower surface of the magnetic conductive disk in the middle, the lower bottom surface of the magnetic yoke column is the lower end surface of the magnetic yoke column, thus, it can be known that Figure 8 In the embodiment, the lower surface of the magnetic conductive disk and the lower end surface of the magnetic yoke column are located in the same horizontal plane.

[0057] Optionally, the yoke column is formed by stacking magnetic steel sheets, the stacking direction of the magnetic steel sheets is the tangent direction of the cross-sectional circle of the positioned furnace lining, the plane of the magnetic steel sheet is perpendicular to the cross-sectional circle of the positioned furnace lining, and is parallel to the normal direction of the cross-sectional circle of the positioned furnace lining, and the magnetic disc is made of isotropic magnetic material with an iron loss value lower than a preset value, and the iron loss value can be the iron loss value P15 / 50.

[0058] Specifically, the cross section of the furnace lining can be understood as the cross section of the furnace lining in a cylindrical shape, the cross section of the furnace lining is parallel to the bottom surface of the furnace lining, that is, the cross section circle of the furnace lining is perpendicular to the axial direction of the furnace lining, and the lamination direction of the magnetic steel sheet is the tangent direction of the cross section circle of the furnace lining where it is positioned. Figure 5 For example, the cross-sectional view shown in Figure 5 The topmost magnetic yoke column is formed by stacking the magnetic steel sheets from left to right. Figure 5 The leftmost yoke column is formed by stacking the magnetic steel sheets from top to bottom. The plane of the magnetic steel sheets is perpendicular to the cross section of the furnace lining. Figure 3 The horizontal plane of the furnace lining, for example, the bottom surface of the furnace lining, the plane of the magnetic steel sheet is parallel to the normal direction of the cross-section circle of the furnace lining at the location, and the Figure 5 For example, the cross-sectional view shown in Figure 5 For the top yoke column, it can be understood that the plane of the magnetic steel sheet here is parallel to Figure 5 The upper and lower center lines.

[0059] Optionally, it also includes:

[0060] The magnetic conductive ring is installed above the plurality of magnetic yoke columns and connected to the upper ends of the plurality of magnetic yoke columns. The material is the same as that of the magnetic conductive disk. The magnetic conductive ring is located at the upper end of the magnetic yoke column and serves to connect the magnetic circuit.

[0061] Specifically, for the yoke column, there are usually insulation measures between the magnetic steel sheets, and the direction of the magnetic field in the yoke column is parallel to the magnetic steel sheets, which can reduce its eddy current loss, so its magnetic field magnetic circuit energy consumption is relatively low. The situation of the magnetic conductive ring and the magnetic conductive disk is different. Their orientation is different from that of the yoke column. Compared with the situation that the direction of the magnetic field in the yoke column is parallel to the plane of the magnetic conductive steel sheets constituting the yoke column, the direction of the magnetic field inside the magnetic conductive ring and the magnetic conductive disk is relatively complex, not a single direction. In order to reduce the energy consumption of the magnetic circuit, the materials of the above-mentioned magnetic conductive ring and the magnetic conductive disk need to be isotropic with respect to the magnetic field, and the iron loss related indicators need to be limited, such as limiting the iron loss value to P15 / 50. For example, under the premise of meeting the magnetic conductivity, the iron loss value P15 / 50 of the material is as low as possible below 3.0W / kg (watt / kilogram), that is, the preset value is 3.0W / kg.

[0062] Fig.10 A schematic diagram of a steel smelting heating system in an embodiment of the present application is shown. Fig.10 middle, Fig.10 9 is an openable and closable molten iron discharge channel, 10 is a steel charge connecting section, 11 is a steel charge to be smelted, 12 is slag, 13 is molten steel or molten iron, 14 is an openable and closable slag discharge channel, and 15 is a reversible grate, see Fig.10 According to the second aspect of the present application, a steel smelting and heating system is provided, comprising an electromagnetic induction melting furnace and a steel charge connecting section, wherein the steel charge connecting section is installed above the electromagnetic induction melting furnace, and the lower end of the steel charge connecting section is sealed and connected to the electromagnetic induction melting furnace for caching, preheating and continuous downward delivery of the steel charge.

[0063] Optionally, it also includes a steel charge temperature control system located in the steel charge connecting section, which is used to control the temperature of the steel charge in the steel charge connecting section. Optionally, it also includes an independent steel charge preheating section, which is connected to the steel charge connecting section and is used for preheating, conveying and hot charging the steel charge. A reversible grate is installed at the bottom of the steel charge connecting section, which is used to support and lower the steel charge. Fig.10 For example, the reversible grate is in Fig.10 In the state, the reversible grate supports the steel charge, and the reversible grate is turned downward, that is, the reversible grate on the left side rotates around the left side and rotates downward clockwise, and the reversible grate on the right side rotates around the right side and rotates downward counterclockwise, so as to lower the steel charge and the steel charge enters the furnace lining.

[0064] Optionally, the grate is a fishbone structure with a central axis, the central axis is arranged radially along the furnace lining, the central axis may be one or two, and when the central axis is one, fishbone structures are respectively arranged on both sides of the central axis. Fig.10For example, when the fishbone structure on the left rotates counterclockwise from the horizontal direction to the vertical direction, the steel charge is lowered, and when the fishbone structure on the right rotates clockwise from the horizontal direction to the vertical direction, the steel charge is lowered. When there are two central axes, the two central axes are parallel to each other. The left side of the central axis on the left is provided with a fishbone structure, and the right side of the central axis on the right is provided with a fishbone structure. The fishbone structure on the left and the fishbone structure on the right can rotate separately or simultaneously. Optionally, it also includes an openable and closable molten iron discharge channel and an openable and closable slag discharge channel. The openable and closable molten iron discharge channel and the openable and closable slag discharge channel pass through the inner cavity of the furnace lining and the outer periphery of the furnace lining, and are used to draw out molten steel or molten iron and slag after smelting. The openable and closable molten iron discharge channel is used to draw out molten steel or molten iron after smelting, and the openable and closable slag discharge channel is used for smelting slag.

[0065] According to a third aspect of the present application, a steel smelting heating method is provided, comprising:

[0066] Preheating the steel charge to be melted in the steel charge connecting section to a preset temperature, wherein the preset temperature is lower than the Curie temperature of the ferromagnetic material of the steel charge;

[0067] transporting the preheated steel charge from the steel charge connecting section to the electromagnetic induction melting furnace;

[0068] Starting the electromagnetic induction melting furnace to melt the steel charge to produce molten iron or molten steel, with slag on the upper surface of the molten iron or molten steel;

[0069] After smelting is completed, the slag is discharged, followed by the molten steel or iron.

[0070] Optionally, preheating the steel charge to be smelted in the steel charge connecting section to a preset temperature comprises:

[0071] The steel charge to be melted is preheated to a preset temperature through the independent steel charge preheating section, and then added to the steel charge connecting section, in which the steel charge is heated to a preset temperature, or the steel charge to be melted is directly placed in the steel charge connecting section, and the steel charge connecting section is heated to preheat the steel charge to a preset temperature, wherein the preset temperature is lower than the preset temperature, for example, 100-200°C lower than the preset temperature, so as to leave room for temperature adjustment of the steel charge connecting section.

[0072] Specifically, when heating the steel charge in the steel charge connection section, the furnace gas of the electromagnetic induction melting furnace can be used for heating first, and then a separate preheating device, such as a gas nozzle, can be used for supplementary heating to control it to reach a preset temperature.

[0073] It should be noted that, for the steel charge added to the electromagnetic induction melting furnace for the first time, it is directly added to the electromagnetic induction melting furnace after preheating, rather than being placed in the steel charge connecting section. When the steel charge added for the first time reaches the rated amount of the electromagnetic induction melting furnace, the steel charge added again is placed in the steel charge connecting section to reach the preset temperature, and as part of the magnetic circuit, it connects the magnetic field in the magnetic conductive path such as the magnetic conductive disk, the magnetic yoke column, and the magnetic conductive ring.

[0074] Optionally, the preset temperature can be a temperature range, and the temperature of the steel charge in the steel charge connecting section is controlled by the steel charge temperature control system, so that the steel charge to be smelted is preheated to the preset temperature, such as controlled within a certain range, taking the preset temperature as 680°C to 700°C, that is, lower than the Curie temperature of the ferromagnetic material. For example, if the real-time temperature of the steel charge in the steel charge connecting section is close to 700°C, such as 699°C, the heat energy input in the steel charge connecting section is reduced or even stopped. If the real-time temperature is less than 680°C, such as 678°C, the heat energy input in the steel charge connecting section is increased.

[0075] It should be noted that, during the smelting process as a magnetic conductive path, the steel charge in the connecting section will also be heated by the thermal effect of the induced magnetic field and its temperature will rise along with the increase in the temperature of the electromagnetic induction smelting furnace. Its temperature will gradually exceed the Curie temperature of the ferromagnetic material. This is normal and inevitable. This change process can be regulated by adjusting the predetermined temperature and the preset temperature of the steel charge, and the smelting process can be optimized or carried out according to a predetermined process route. For example, when other conditions remain unchanged, when the preset temperature is lowered, the time when the steel charge in the connecting section exceeds the Curie temperature of the ferromagnetic material will be delayed. When the preset temperature is increased, the time when the steel charge in the connecting section exceeds the Curie temperature of the ferromagnetic material will be advanced.

[0076] Fig.11 The temperature variation trend of the magnetic conductivity of ferromagnetic materials is shown in Fig.11 It can be seen that when the temperature is lower than 700°C, the magnetic conductivity of ferromagnetic materials is still relatively high.

[0077] Optionally, the steel smelting and heating method is continuous smelting within a preset period, that is, continuous charging, preheating, smelting and heating, slag discharge, and molten steel or molten iron discharge.

[0078] In summary, when the iron and steel charge is melted, the magnetic disk is located below the furnace lining to form a magnetic path extending to the center position below the electromagnetic induction melting furnace. The iron and steel charge to be melted is located in the iron and steel charge connecting section above the electromagnetic induction melting furnace. Since the iron and steel charge to be melted is mainly composed of iron and iron oxide components, that is, the iron and steel charge is mainly composed of ferromagnetic materials, its temperature is controlled to be lower than the Curie temperature point, so that it has magnetic conductivity, that is, the relative magnetic permeability is much greater than 1, so as to form a magnetic path extending to the center position above the electromagnetic induction melting furnace. The electromagnetic induction melting furnace has a magnetic conductive path extending to the center of the furnace lining, thereby adding magnetic conductive paths extending to the center of the furnace lining at the upper and lower parts of the electromagnetic induction melting furnace. The magnetic conductive disk, the magnetic yoke column and the steel charge to be melted together form a magnetic conductive path, so that the magnetic field is distributed more evenly in the furnace lining cavity than in the prior art, and the melting temperature in the furnace is more uniform than in the prior art. In addition, the magnetic conductive path extends to the center of the upper and lower parts of the electromagnetic induction melting furnace. Compared with the prior art, the magnetic resistance is lower in terms of transmitting the magnetic field through the air. Under the condition of the same heating power, the excitation current is lower, thereby improving the heating efficiency.

[0079] In the present application, the magnetic disk and each of the magnetic yoke columns form a magnetic path, and the magnetic disk closes the magnetic circuit below the furnace lining, so that the magnetic circuit of the present application has better sealing performance and higher heating efficiency.

[0080] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0081] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0082] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly or all or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc., which can store program code.

[0083] The above description is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

Claims

1. An electromagnetic induction melting furnace, characterized in that: include: The furnace lining is used to place the smelting charge and is in the shape of a barrel with the opening upward; The induction coil is sleeved on the radial outer side of the furnace lining and is used to introduce an induced current to generate an induced magnetic field; A plurality of magnetic yoke columns are evenly distributed on the radial periphery of the induction coil to form a squirrel cage structure; The magnetic conductive disk is located below the bottom of the furnace substrate, and its outer periphery is connected to each of the magnetic yoke columns to form a magnetic conductive path with the magnetic yoke columns.

2. The electromagnetic induction melting furnace according to claim 1, characterized in that: The outer diameter of the magnetic conductive disk is smaller than or equal to the inner diameter of the bottom of the furnace lining cavity.

3. The electromagnetic induction melting furnace according to claim 1, characterized in that: The yoke column is L-shaped consisting of a vertical section and a horizontal section, the vertical section is distributed along the axial direction of the furnace lining, the horizontal section is distributed along the radial direction of the furnace lining, the horizontal section is located below the bottom of the furnace lining, the end of the horizontal section is connected to the magnetic conductive disk, the thickness of the horizontal section is less than the thickness of the magnetic conductive disk, and the lower bottom surface of the magnetic conductive disk is flush with the lower bottom surface of the yoke column.

4. The electromagnetic induction melting furnace according to claim 1, characterized in that: The yoke column is formed by stacking magnetic steel sheets, the stacking direction of the magnetic steel sheets is the tangent direction of the cross-sectional circle of the positioned furnace lining, the plane of the magnetic steel sheet is perpendicular to the cross-sectional circle of the positioned furnace lining, and is parallel to the normal direction of the cross-sectional circle of the positioned furnace lining, and the magnetic disc is made of isotropic magnetic material with an iron loss value lower than a preset value.

5. The electromagnetic induction melting furnace according to claim 1, characterized in that: Also includes: The magnetic conductive ring is installed above the plurality of magnetic yoke columns and connected to the upper ends of the plurality of magnetic yoke columns. The material of the magnetic conductive ring is the same as that of the magnetic conductive disk.

6. A steel smelting heating system, characterized in that: It comprises an electromagnetic induction melting furnace and a steel charge connecting section as described in any one of claims 1 to 5, wherein the steel charge connecting section is installed above the electromagnetic induction melting furnace, and the lower end of the steel charge connecting section is sealed and connected to the electromagnetic induction melting furnace for caching, preheating and continuous downward delivery of the steel charge.

7. A steel smelting heating system according to claim 6, characterized in that: It also includes an independent steel charge preheating section, which is connected to the steel charge connecting section and is used for preheating, conveying and hot charging of the steel charge. A reversible grate is installed at the bottom of the steel charge connecting section for supporting and lowering the steel charge.

8. A steel smelting heating system according to any one of claims 6-7, characterized in that: It also includes an openable and closable molten iron discharge channel and an openable and closable slag discharge channel. The openable and closable molten iron discharge channel and the openable and closable slag discharge channel pass through the inner cavity of the furnace lining and out of the outer periphery of the furnace lining to lead out the molten steel or molten iron and slag after smelting.

9. A method for heating steel smelting, characterized in that: include: Preheating the steel charge to be melted in the steel charge connecting section to a preset temperature, wherein the preset temperature is lower than the Curie temperature of the ferromagnetic material of the steel charge; transporting the preheated steel charge from the steel charge connecting section to the electromagnetic induction melting furnace; Starting the electromagnetic induction melting furnace to melt the steel charge; After smelting is completed, the slag is discharged, followed by the molten steel or iron.

10. A steel smelting and heating method according to claim 9, characterized in that: The steel smelting and heating method is continuous smelting within a preset period.

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