High-power inductor for ferronickel smelting

Abstract

The invention discloses a high-power inductor for ferronickel smelting. The high-power inductor comprises a shell, a fireproof inner core, a copper sleeve, an iron core and a coil, the fire-resistant inner core is installed in the shell, two hollow columns penetrating through the fire-resistant inner core are arranged in the fire-resistant inner core, the iron core penetrates through the hollow columns, and the hollow columns enable an inner cavity of the fire-resistant inner core to form a W-shaped melting channel; the copper sleeve is arranged in the hollow column of the fireproof inner core; the iron core penetrates through the copper sleeve, and the coil is wound on the iron core. The W-shaped melting channel of the inductor is a jet flow type melting channel, the coils in the two hollow columns can generate a certain temperature difference in the W-shaped melting channel, molten metal can be promoted to flow in the melting channel, convection between the molten metal in the melting channel and molten metal in a hearth can be promoted, the molten metal is prevented from forming a dead zone in the melting channel, and the molten metal in the hearth is prevented from forming a dead zone. The service life of the inductor is prolonged; and the energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the field of metal smelting, in particular to a high-power inductor for ferronickel smelting. Background Art

[0002] At present, cored induction furnaces have been widely used in metal processing industries including nickel iron. Cored induction furnaces mainly include a main furnace and an induction body. The induction body mainly includes a shell and an internal iron core and coil, and the induction body is installed on the furnace. The basic working principle of a cored induction furnace is: the molten metal in the furnace flows into the induction body. The space in the induction body used to accommodate the molten metal is called a molten groove. The molten metal is a single-turn secondary coil relative to the coil in the induction body. Under the action of the alternating magnetic field of the primary coil, a huge induced current is generated in the molten metal in the molten groove, causing the molten metal to heat up. The heated molten metal exchanges heat with the molten metal with a lower temperature in the main furnace; in this way, the induction body continuously supplies heat to the molten metal in the main furnace, thereby continuously melting the solid metal subsequently put into the main furnace.

[0003] The defects of the core induction furnace in the prior art are: 1. The structure of the melting groove is single, and the molten metal inside the melting groove has poor fluidity and is prone to form dead zones. The service life of the refractory materials in the dead zones is sharply reduced and may even be melted through; 2. The primary coil, the shell of the induction body, and the refractory materials inside the induction body are exposed to high-temperature molten metal for a long time, resulting in their own temperature being too high, which affects the material life. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the inductor in the cored induction furnace of the prior art is prone to form a dead zone in the molten groove, and various components in the inductor are easily affected by the high temperature of the molten metal, resulting in a short overall service life of the inductor.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a high-power inductor for nickel-iron smelting, comprising a shell, a refractory inner core, a copper sleeve, an iron core and a coil;

[0006] The refractory inner core is installed in the shell, and two hollow columns penetrating the refractory inner core are arranged in the refractory inner core, the hollow columns are used for the iron core to pass through, and the hollow columns make the inner cavity of the refractory inner core form a W-shaped melting groove;

[0007] There are two types of materials for making the refractory inner core: one is a castable, and the other is a dry vibration molding material. The price of the castable is relatively cheap, but there are problems such as the construction quality is difficult to control, the baking system varies greatly with the climate and the physical and chemical indicators of the refractory materials and is difficult to control, it is difficult to form a sintered layer at low temperatures, and it is easy to form permeable cracks. The dry vibration molding material has the advantages of simple construction, easy control of the baking process, the ability to form a low-temperature sintered layer, and self-healing properties when the sintered layer cracks, but the price is relatively expensive. Considering that the inductor of the present invention has high power and high temperature during metal smelting, it is advisable to use dry vibration molding material to make the refractory inner core;

[0008] The copper sleeve is arranged in the hollow column of the refractory inner core;

[0009] The iron core passes through the copper sleeve, and the coil is wound around the iron core.

[0010] The inductor of the present invention is mainly used for smelting nickel iron and nickel iron alloy. When used, the inductor is installed on the furnace of a smelting furnace, and the W-shaped melting groove of the inductor is connected to the inner cavity of the furnace. Initially, the relatively low-temperature nickel iron and nickel iron alloy molten metal in the furnace flows into the melting groove of the inductor. For the convenience of expression, the nickel iron and nickel iron alloy molten metal are referred to as molten metal in the following text. The molten metal is a single-turn secondary coil relative to the coil in the inductor. Under the action of the alternating magnetic field of the primary coil, a huge induced current is generated in the molten metal in the melting groove, causing the molten metal to heat up. The heated molten metal exchanges heat with the molten metal with a lower temperature in the main furnace. In this way, the inductor continuously supplies heat to the molten metal in the main furnace, thereby continuously melting the solid nickel iron metal subsequently put into the main furnace. The W-shaped melting groove of the induction body of the present invention is a jet-type melting groove. The coils in the two hollow columns can produce a certain temperature difference in the W-shaped melting groove, which can not only promote the flow of molten metal in the melting groove, but also promote convection between the molten metal in the melting groove and the molten metal in the furnace, thereby avoiding the formation of dead zones in the melting groove by the molten metal, improving the service life of the induction body and reducing energy consumption.

[0011] In order to reduce the influence of high-temperature molten metal on the various parts of the inductor, the inductor of the present invention is also provided with a first cooling pipe, a second cooling pipe and a third cooling pipe, wherein the first cooling pipe is wound around the iron core, the second cooling pipe is arranged on the shell, and the third cooling pipe is arranged on the inner wall of the copper sleeve. When working, the first cooling pipe, the second cooling pipe and the third cooling pipe are internally introduced with circulating cooling water, which are used to reduce the temperature of the iron core, the shell temperature and the copper sleeve temperature respectively, and can also reduce the local temperature of the refractory inner core in the corresponding area to prevent the molten metal from leaking into the refractory material.

[0012] Specifically, the copper sleeve includes two C-shaped sleeves, the openings of the two C-shaped sleeves are opposite to each other and welded to each other, and the cross section of the copper sleeve is rectangular and the four corners are arc-shaped.

[0013] Furthermore, in order to increase the contact area between the third cooling tube and the copper sleeve, the third cooling tube is coiled into an S shape, the S-shaped area of ​​the third cooling tube fits the vertical inner wall of the copper sleeve, the S-shaped turning area of ​​the third cooling tube is bent and fits with the rounded corner of the copper sleeve, and straight tube areas are reserved at both ends of the third cooling tube to fit with the upper and lower inner walls of the copper sleeve.

[0014] The present invention provides two ways of connecting the third cooling pipe to the inner wall of the copper sleeve. The first way is: the third cooling pipe is directly welded to the inner wall of the copper sleeve. This connection method is simple to operate, but is not conducive to the later replacement of the third cooling pipe. When the third cooling pipe is working, circulating cooling water is introduced into the inner wall for a long time, which makes the inner wall of the third cooling pipe easy to scale and needs to be replaced regularly. If the direct welding method is adopted, cutting marks will be left on the inner wall of the copper sleeve when the third cooling pipe is replaced. After multiple replacements, the copper sleeve is difficult to continue to use.

[0015] The present invention also provides another connection method between the third cooling tube and the copper sleeve: the inner wall of the copper sleeve is provided with transverse grooves and longitudinal grooves, a plurality of rectangular fins are inserted into the transverse grooves and longitudinal grooves, and one side of the rectangular fins is attached to and welded with the third cooling tube. The rectangular fins can not only increase the heat dissipation effect, but also serve as a connector between the third cooling tube and the copper sleeve. Although this connection method makes the structure relatively complicated, the copper sleeve and the rectangular fins only need to be plugged in, and the copper sleeve does not need to be welded with other parts. When replacing the third cooling tube, there is no need to perform any cutting operation on the copper sleeve, and the copper sleeve will not be damaged, ensuring that the copper sleeve can be used continuously.

[0016] The third cooling pipe in the present invention is installed according to the following steps:

[0017] Step 1: Coil the raw material straight tube of the third cooling tube several times in the shape of the letter S, and reserve straight tube sections of appropriate length at both ends;

[0018] Step 2: Perform a preliminary bend on the turning point of the coiled S-shaped third cooling pipe;

[0019] Step 3: shaping the turning part of the coiled S-shaped third cooling tube so that the turning part of the third cooling tube fits with the rounded corner of the inner wall of the copper sleeve;

[0020] Step 4: Place the shaped third cooling tube on the inner wall of the copper sleeve;

[0021] Step 5: Insert the rectangular fin into the transverse groove or the longitudinal groove of the inner wall of the copper sleeve, translate the rectangular fin along the transverse groove or the longitudinal groove so that the rectangular fin fits the third cooling tube, and weld the rectangular fin to the third cooling tube.

[0022] Furthermore, in step 3, the specific method for shaping the third cooling tube is: filling the coiled S-shaped third cooling tube with water, then welding metal sheets at both ends of the third cooling tube to block the third cooling tube, then using a mold to extrude the third cooling tube to shape it, and finally cutting the two blocked ends of the third cooling tube.

[0023] Beneficial effects: (1) The inductor of the present invention is provided with a W-shaped melting groove inside the shell. This jet-type melting groove has a stronger stirring ability, which can not only promote the flow of molten metal in the melting groove, but also promote the convection between the molten metal in the melting groove and the molten metal in the furnace, thereby avoiding the formation of a dead zone in the melting groove by the molten metal, thereby improving the service life of the inductor and reducing energy consumption. (2) The inductor of the present invention is provided with a plurality of circulating water cooling pipes to cool the shell, iron core, copper sleeve and refractory inner core inside the inductor, thereby improving the service life of the inductor and making the conversion efficiency of the electrical energy, magnetic energy and thermal energy of the inductor higher, thereby reducing energy consumption. (3) The inductor of the present invention adopts rectangular fins in combination with transverse grooves and longitudinal grooves to realize the installation of the third cooling pipe, so that the third cooling pipe will not damage the copper sleeve when replaced, thereby improving the replacement efficiency of the third cooling pipe and reducing the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional diagram of the inductor of Example 1.

[0025] Figure 2 This is a top view of the inductor of Example 1.

[0026] Figure 3 yes Figure 2 AA cross-section diagram.

[0027] Figure 4 It is a structural diagram of the iron core, copper sleeve and cooling tube in Example 1 (one copper sleeve is hidden).

[0028] Figure 5 It is a structural diagram of the copper sleeve and the third cooling tube in Example 1.

[0029] Figure 6 This is a schematic diagram of the winding of the third cooling tube in Example 1.

[0030] Figure 7 It is a schematic diagram of the preliminary bending and shaping of the third cooling tube in Example 1.

[0031] Figure 8 This is an application state diagram of the sensor of Example 1.

[0032] Fig. 9 It is a structural diagram of the copper sleeve and the third cooling tube in Example 2.

[0033] Among them: 100, shell; 200, refractory inner core; 210, hollow column; 300, copper sleeve; 310, transverse groove; 320, longitudinal groove; 400, iron core; 500, first cooling tube; 600, second cooling tube; 700, third cooling tube; 800, melting groove; 900, mold; 1000, furnace; 1100, rectangular fin. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with specific implementation modes.

[0035] Example 1

[0036] like Figures 1 to 3 As shown, the high-power inductor for ferronickel smelting in this embodiment includes a shell 100 , a refractory inner core 200 , a copper sleeve 300 , an iron core 400 , a coil, a first cooling tube 500 , a second cooling tube 600 and a third cooling tube 700 .

[0037] The refractory core 200 is installed in the shell 100, and the material of the refractory core 200 is dry vibration molding material; the refractory core 200 is provided with two hollow columns 210 penetrating the refractory core 200, and the hollow columns 210 are used for the iron core 400 to pass through. The hollow columns 210 make the inner cavity of the refractory core 200 form a W-shaped melting groove 800.

[0038] The copper sleeve 300 is arranged in the hollow column 210 of the fire-resistant inner core 200 ; the iron core 400 passes through the copper sleeve 300 , and the coil is wound around the iron core 400 .

[0039] like Figure 1 , Figure 4 and Figure 5 As shown, the first cooling pipe 500 is wound around the iron core 400, the second cooling pipe 600 is arranged on the shell 100, and the third cooling pipe 700 is arranged on the inner wall of the copper sleeve 300. When working, the first cooling pipe 500, the second cooling pipe 600 and the third cooling pipe 700 introduce circulating cooling water inside, which are used to reduce the temperature of the iron core 400, the temperature of the shell 100 and the temperature of the copper sleeve 300 respectively, and can also reduce the local temperature of the refractory inner core 200 in the corresponding area to prevent the metal liquid from leaking into the refractory material.

[0040] like Figure 5 As shown, the copper sleeve 300 includes two C-shaped sleeves, the openings of the two C-shaped sleeves are opposite and welded to each other, and the cross section of the copper sleeve 300 is rectangular and the four corners are arc-shaped. The third cooling tube 700 is S-shaped after winding, and the S-shaped area of ​​the third cooling tube 700 fits the vertical inner wall of the copper sleeve 300. The S-shaped turning area of ​​the third cooling tube 700 fits the rounded corner of the copper sleeve 300 after bending. The straight tube areas reserved at both ends of the third cooling tube 700 fit the upper and lower inner walls of the copper sleeve 300. The third cooling tube 700 is welded to the inner wall of the copper sleeve 300.

[0041] The third cooling pipe 700 in this embodiment is installed according to the following steps:

[0042] Step 1: Figure 6 As shown, the raw material straight tube of the third cooling tube 700 is coiled multiple times in the shape of the letter S, and straight tube sections of appropriate length are reserved at both ends;

[0043] Step 2: Perform a preliminary bend on the turning point of the coiled S-shaped third cooling tube 700. The side view of the preliminary bent third cooling tube 700 is as follows: Figure 7 As shown;

[0044] Step 3: Shape the turning part of the S-shaped third cooling tube 700 after winding so that the turning part of the third cooling tube 700 fits with the rounded corner of the inner wall of the copper sleeve 300; the specific method of shaping the third cooling tube 700 is: fill the S-shaped third cooling tube 700 after winding and preliminary bending with water, and then weld metal sheets at both ends of the third cooling tube 700 to block the third cooling tube 700, and then Figure 7 As shown, the third cooling tube 700 is shaped by extruding the mold 900, and finally the two plugged ends of the third cooling tube 700 are cut; the third cooling tube 700 having the shape consistent with the inner wall of the copper sleeve 300 is obtained.

[0045] Step 4: Place the shaped third cooling tube 700 on the inner wall of the copper sleeve 300 and weld it.

[0046] The high-power inductor of this embodiment is installed in the following manner when in use. Figure 8 In the furnace 1000 of the core induction furnace shown in the figure, the W-shaped melting groove 800 of the inductor is connected to the inner cavity of the furnace 1000; one or more inductors can be installed on a furnace 1000. Figure 8The furnace 1000 shown can be equipped with up to four induction bodies. At the beginning of smelting, the relatively low-temperature molten metal in the furnace 1000 flows into the melting groove 800 of the induction body. The molten metal is a single-turn secondary coil relative to the coil in the induction body. Under the action of the alternating magnetic field of the primary coil, a huge induced current is generated in the molten metal in the melting groove 800, causing the molten metal to heat up. The heated molten metal exchanges heat with the lower-temperature molten metal in the main furnace 1000; in this way, the induction body continuously supplies heat to the molten metal in the main furnace 1000, thereby continuously melting the solid metal subsequently put into the main furnace 1000. The W-shaped melting groove 800 of the induction body of the present embodiment is a jet-type melting groove 800. The coils in the two hollow columns 210 can generate a certain temperature difference in the W-shaped melting groove 800, which can not only promote the flow of molten metal in the melting groove 800, but also promote the convection between the molten metal in the melting groove 800 and the molten metal in the furnace 1000, thereby avoiding the formation of a dead zone in the melting groove 800 by the molten metal, thereby increasing the service life of the induction body and reducing energy consumption.

[0047] Example 2

[0048] The high-power inductor for ferronickel smelting in this embodiment is substantially the same as that in the first embodiment, except for the connection method between the third cooling tube 700 and the inner wall of the copper sleeve 300 .

[0049] like Fig. 9 As shown, the inner wall of the copper sleeve 300 in this embodiment is provided with a transverse groove 310 and a longitudinal groove 320, and a plurality of rectangular fins 1100 are inserted into the transverse groove 310 and the longitudinal groove 320, and one side of the rectangular fin 1100 is attached to and welded with the third cooling tube 700. The rectangular fin 1100 can not only play a role in increasing the heat dissipation effect, but also serve as a connector between the third cooling tube 700 and the copper sleeve 300. Although this connection method makes the structure relatively complicated, the copper sleeve 300 and the rectangular fin 1100 only need to be plugged in, and the copper sleeve 300 does not need to be welded with other parts. When replacing the third cooling tube 700, it is not necessary to perform any cutting operation on the copper sleeve 300, and the copper sleeve 300 is not damaged, ensuring that the copper sleeve 300 can be used continuously.

[0050] Although the embodiments of the present invention are described in the specification, these embodiments are only for reference and should not limit the protection scope of the present invention. Various omissions, substitutions and changes within the scope of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-power inductor for ferronickel smelting, characterized in that: It comprises a shell (100), a fire-resistant inner core (200), a copper sleeve (300), an iron core (400) and a coil; The refractory inner core (200) is installed in the shell (100), and two hollow columns (210) are arranged in the refractory inner core (200) and penetrate the refractory inner core (200), and the hollow columns (210) enable the inner cavity of the refractory inner core (200) to form a W-shaped melting groove (800); The copper sleeve (300) is arranged in the hollow column (210) of the refractory inner core (200); The iron core (400) passes through the copper sleeve (300), and the coil is wound around the iron core (400).

2. The high-power inductor for ferronickel smelting according to claim 1, characterized in that: It also includes a first cooling tube (500), which is wound around the iron core (400).

3. The high-power inductor for ferronickel smelting according to claim 1 is characterized in that: The invention also includes a second cooling pipe (600), which is arranged on the housing (100).

4. The high-power inductor for ferronickel smelting according to claim 1, characterized in that: The copper sleeve (300) comprises two C-shaped sleeves, the openings of the two C-shaped sleeves are opposite to each other and welded to each other, and the cross section of the copper sleeve (300) is rectangular and the four corners are in arc shape.

5. The high-power inductor for ferronickel smelting according to claim 4 is characterized in that: The invention also comprises a third cooling pipe (700), wherein the third cooling pipe (700) is arranged on the inner wall of the copper sleeve (300).

6. The high-power inductor for ferronickel smelting according to claim 5, characterized in that: The third cooling tube (700) is coiled into an S shape, the S-shaped region of the third cooling tube (700) fits the vertical inner wall of the copper sleeve (300), the S-shaped turning region of the third cooling tube (700) fits the rounded corner of the copper sleeve (300) after being bent, and straight tube regions are reserved at both ends of the third cooling tube (700) to fit the upper and lower inner walls of the copper sleeve (300).

7. The high-power inductor for ferronickel smelting according to claim 6, characterized in that: The third cooling pipe (700) is welded to the inner wall of the copper sleeve (300).

8. The high-power inductor for ferronickel smelting according to claim 6, characterized in that: The inner wall of the copper sleeve (300) is provided with a transverse groove (310) and a longitudinal groove (320), a plurality of rectangular fins (1100) are inserted into the transverse groove (310) and the longitudinal groove (320), and one side of the rectangular fin (1100) is attached to and welded to the third cooling tube (700).

9. The high-power inductor for ferronickel smelting according to claim 8, characterized in that: The third cooling pipe (700) is installed according to the following steps: Step 1: Coil the raw material straight tube of the third cooling tube (700) multiple times in the shape of the letter S, leaving straight tube sections of appropriate length at both ends; Step 2: Preliminarily bend the turning point of the coiled S-shaped third cooling tube (700); Step 3: shaping the turning portion of the coiled S-shaped third cooling tube (700) so that the turning portion of the third cooling tube (700) fits with the rounded corner of the inner wall of the copper sleeve (300); Step 4: placing the shaped third cooling tube (700) on the inner wall of the copper sleeve (300); Step 5: Insert the rectangular fin (1100) into the transverse groove (310) or the longitudinal groove (320) on the inner wall of the copper sleeve (300), translate the rectangular fin (1100) along the transverse groove (310) or the longitudinal groove (320) so that the rectangular fin (1100) fits the third cooling tube (700), and weld the rectangular fin (1100) and the third cooling tube (700).

10. The high-power inductor for ferronickel smelting according to claim 9, characterized in that: The specific method of shaping the third cooling tube (700) in step 3 is: filling the coiled S-shaped third cooling tube (700) with water, then welding metal sheets at both ends of the third cooling tube (700) to block the third cooling tube (700), then using a mold to extrude the third cooling tube (700) to shape it, and finally cutting the two blocked ends of the third cooling tube (700).

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