Double-frequency induction electric arc furnace

Abstract

The utility model discloses a double-frequency induction electric arc furnace which comprises a direct-current power supply device, a double-frequency variable-frequency power supply device, a series resonance capacitor, a coupling reactor, a short net, a top cathode, an induction coil, a bottom anode and a furnace body. The double-frequency variable-frequency power supply device outputs two groups of single-phase alternating-current circuits, one group is a low-frequency single-phase alternating-current circuit, and the other group is a high-frequency single-phase alternating-current circuit; the series resonance capacitor is connected in series between the high frequency of the dual-frequency variable-frequency power supply device and the induction coil to form a series resonance working mode; and the coupling reactor is connected in series between the dual-frequency variable-frequency power supply low-frequency device and the induction coil to form a parallel resonance working mode. The induction coil simultaneously participates in high-frequency and low-frequency resonance to generate a high-frequency and low-frequency composite magnetic field. The induction heating device has the advantages of high induction heating efficiency and good magnetic stirring effect on particle and particle powder metal, and has a better use effect than a medium-frequency electric arc furnace in some use scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic metallurgy, in particular to a dual-frequency induction arc furnace. Background Art

[0002] A large amount of solid waste, hazardous waste, and tailings are generated during the production process in the metallurgical and chemical industries. Due to the low metal content, it is difficult to recycle and reuse them. This has become a problem that countries around the world must face and urgently need to solve. Traditional industrial solid waste and hazardous waste treatment mostly adopts pit landfill, on-site stacking or remelting in electric arc furnaces to recover some heavy metals. However, due to its high energy consumption, large investment, low quality of heavy metal recovery, and high dust emissions, it has been difficult to promote its use.

[0003] The patent with authorization announcement number CN113915999B discloses a medium frequency induction arc furnace and smelting control method. The arc furnace includes a flexible DC power supply device, a medium frequency AC power supply device, a series resonant capacitor group, a conversion switch, a short network, a top cathode, a bottom anode, two sections of medium frequency induction coils and a furnace body; the flexible DC power supply device heats the charge through the short network via a graphite electrode, and the medium frequency AC power supply device uses a medium frequency induction coil to generate high-density magnetic lines to melt the charge after passing through a series resonant capacitor group and a conversion switch. In some usage scenarios, such as when smelting particles and microparticle powders, the use of medium frequency induction heating is not obvious, and the electromagnetic stirring effect of the medium frequency is not as good as the low-frequency electromagnetic stirring effect. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a dual-frequency induction arc furnace, which has the advantages of high induction heating efficiency for granular and microparticle powder metals and good magnetic stirring effect. In some usage scenarios, it is better than the medium-frequency arc furnace and can effectively solve the problems in the background technology.

[0005] To achieve the above object, the utility model provides the following technical solutions: a dual-frequency induction arc furnace, comprising a DC power supply device, a dual-frequency variable frequency power supply device, a series resonant capacitor, a coupling reactor, a short network, a top cathode, an induction coil, a bottom anode and a furnace body;

[0006] The dual-frequency variable frequency power supply device outputs two groups of single-phase AC circuits, one group of low-frequency single-phase AC circuits with a frequency of 50Hz to 500Hz, and the other group of high-frequency single-phase AC circuits with a frequency of 1000Hz to 20000Hz;

[0007] The series resonant capacitor is connected in series in the high-frequency single-phase AC circuit, and the coupling reactor is connected in series in the low-frequency single-phase AC circuit;

[0008] The series resonant capacitor is connected in series between the dual-frequency variable frequency power supply device and the induction coil to form a series resonant working mode;

[0009] The coupling reactor is connected in series between the dual-frequency variable frequency power supply device and the induction coil to form a parallel resonance working mode;

[0010] The top cathode and the bottom anode are respectively arranged on the top and the bottom of the furnace body, and the top cathode and the bottom anode are respectively connected in series with the positive and negative electrodes of the DC power supply device through a short network.

[0011] Preferably, the devices used in the DC power supply device are fully-controlled power semiconductor thyristor devices, and a three-phase Vienna PFC rectifier circuit is adopted; the dual-frequency variable frequency power supply device works at low frequency and high frequency simultaneously, or works at low frequency and high frequency separately, and the devices used are fully-controlled IGBT power semiconductor devices, and a three-phase Vienna PFC rectifier circuit is adopted.

[0012] Preferably, the short net is a hollow water cable braided with multiple enameled wires.

[0013] Preferably, the material of the top cathode is graphite, and the bottom anode is a plurality of needle-shaped or sheet-shaped metals, which are evenly arranged and distributed in a circle at the bottom of the furnace body.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: the dual-frequency variable frequency power supply device outputs two groups of single-phase AC circuits, one group of low-frequency single-phase AC circuits with a frequency of 50Hz~500Hz, and the other group of high-frequency single-phase AC circuits with a frequency of 1000Hz~20000Hz. The series resonant capacitor is connected in series in the high-frequency single-phase AC circuit, and the coupling inductor is connected in series in the low-frequency single-phase AC circuit. The high frequency has a high induction intensity and high efficiency for particles and microparticles, while the low frequency electromagnetic stirring force is strong. At the same time, it has the advantages of high induction heating efficiency for particles and microparticles and good magnetic stirring effect. In some usage scenarios, it is better than the medium-frequency arc furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the utility model.

[0016] In the figure: 1 DC power supply device, 2 dual-frequency variable frequency power supply device, 3 series resonant capacitor, 4 coupling inductor, 5 short network, 6 top cathode, 7 induction coil, 8 bottom anode, 9 furnace body. DETAILED DESCRIPTION

[0017] The present invention can be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "back", "left", "right", etc. indicating directions or positional relationships, they only correspond to the drawings of the present application for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction.

[0018] See also Figure 1 , the utility model provides a technical solution: a dual-frequency induction arc furnace, comprising a DC power supply device 1, a dual-frequency variable frequency power supply device 2, a series resonant capacitor 3, a coupling reactor 4, a short network 5, a top cathode 6, an induction coil 7, a bottom anode 8 and a furnace body 9;

[0019] The dual-frequency variable frequency power supply device 2 outputs two sets of single-phase AC circuits, one set of low-frequency single-phase AC circuits with a frequency of 50Hz to 1000Hz, and the other set of high-frequency single-phase AC circuits with a frequency of 1000Hz to 20000Hz;

[0020] The series resonant capacitor 3 is connected in series in the high-frequency single-phase AC circuit, and the coupling reactor 4 is connected in series in the low-frequency single-phase AC circuit;

[0021] The series resonant capacitor 3 is connected in series between the dual-frequency variable frequency power supply device 2 and the induction coil 7 to form a series resonant working mode;

[0022] The coupling reactor 4 is connected in series between the dual-frequency variable frequency power supply device 2 and the induction coil 7 to form a parallel resonance working mode;

[0023] The top cathode 6 and the bottom anode 8 are respectively arranged at the top and the bottom of the furnace body 9, and the top cathode 6 and the bottom anode 8 are connected in series with the positive and negative electrodes of the DC power supply device 1 through the short network 5;

[0024] The dual-frequency variable frequency power supply device 2 outputs two groups of single-phase AC circuits, one group of low-frequency single-phase AC circuits with a frequency of 50Hz to 500Hz, and the other group of high-frequency single-phase AC circuits with a frequency of 1000Hz to 20000Hz. The series resonant capacitor 3 is connected in series in the high-frequency single-phase AC circuit, and the coupling inductor 4 is connected in series in the low-frequency single-phase AC circuit. The high frequency has a high induction intensity and high efficiency for particles and micro-powders, while the low frequency has a strong electromagnetic stirring force. At the same time, it has the advantages of high induction heating efficiency for particles and micro-powders and good magnetic stirring effect. In some usage scenarios, it has better use effect than the medium-frequency arc furnace;

[0025] Specifically, the device used in the DC power supply device 1 is a fully controlled power semiconductor thyristor device, and a three-phase Vienna PFC rectifier circuit is adopted; the device used in the dual-frequency variable frequency power supply device 2 is a fully controlled IGBT power semiconductor device, and a three-phase Vienna PFC rectifier circuit is adopted. The DC power supply device 1 and the dual-frequency variable frequency power supply device 2 both adopt a three-phase Vienna PFC rectifier circuit, which is more efficient. The dual-frequency variable frequency power supply device 2 works at low frequency and high frequency simultaneously, or works at low frequency and high frequency separately. The working mode of the dual-frequency variable frequency power supply device 2 can be selected according to the actual working conditions;

[0026] In addition, the material of the top cathode 6 is graphite; the bottom anode 8 is a plurality of needle-shaped or sheet-shaped metals, which are evenly arranged and distributed in a circle at the bottom of the furnace body 9; and the short net 5 is a hollow water cable braided with a plurality of enameled wires.

[0027] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended to include all changes that fall within the meaning and scope of equivalent elements in the content of the present invention.

Claims

1. A dual-frequency induction arc furnace, characterized in that: It comprises a direct current power supply device (1), a dual-frequency variable frequency power supply device (2), a series resonant capacitor (3), a coupling reactor (4), a short network (5), a top cathode (6), an induction coil (7), a bottom anode (8) and a furnace body (9); The dual-frequency variable frequency power supply device (2) outputs two groups of single-phase AC circuits, one group of low-frequency single-phase AC circuits with a frequency of 50 Hz to 500 Hz, and the other group of high-frequency single-phase AC circuits with a frequency of 1000 Hz to 20000 Hz; The series resonant capacitor (3) is connected in series in the high-frequency single-phase AC circuit, and the coupling reactor (4) is connected in series in the low-frequency single-phase AC circuit; The series resonant capacitor (3) is connected in series between the dual-frequency variable frequency power supply device (2) and the induction coil (7) to form a series resonant working mode; The coupling reactor (4) is connected in series between the dual-frequency variable frequency power supply device (2) and the induction coil (7) to form a parallel resonance working mode; The top cathode (6) and the bottom anode (8) are respectively arranged at the top and the bottom of the furnace body (9), and the top cathode (6) and the bottom anode (8) are respectively connected in series with the positive and negative electrodes of the DC power supply device (1) via a short circuit network (5).

2. A dual-frequency induction arc furnace according to claim 1, characterized in that: The devices used in the DC power supply device (1) are fully controlled power semiconductor thyristor devices, and a three-phase Vienna PFC rectifier circuit is adopted; the dual-frequency variable frequency power supply device (2) operates at low frequency and high frequency simultaneously, or operates at low frequency and high frequency separately, and the devices used are fully controlled IGBT power semiconductor devices, and a three-phase Vienna PFC rectifier circuit is adopted.

3. A dual-frequency induction arc furnace according to claim 1, characterized in that: The short net (5) is a hollow-core water cable braided from a plurality of enameled wires.

4. A dual-frequency induction arc furnace according to claim 1, characterized in that: The material of the top cathode (6) is graphite, and the bottom anode (8) is a plurality of needle-shaped or sheet-shaped metals, which are evenly arranged and distributed in a circle at the bottom of the furnace body (9).

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