CN114923332B

CN114923332B - Device capable of simultaneously realizing electromagnetic heating and electromagnetic stirring and control method

Info

Publication number: CN114923332B
Application number: CN202210311305.9A
Authority: CN
Inventors: 刘志珍; 侯延进; 罗学卿; 冯国文; 丁冉; 孙舒瑶; 孙维择; 谢雨欣
Original assignee: Shandong University
Current assignee: Shandong University
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2023-04-18
Anticipated expiration: 2042-03-28
Also published as: CN114923332A

Abstract

The device comprises double-layer coils arranged outside a body to be heated, wherein one layer of the coils is vertically arranged around the body to be heated, and the other layer of the coils is transversely arranged around the body to be heated. The double-layer coil surrounding the body to be heated is arranged, one layer of coil is used for heating, the other layer of coil is used for stirring, the two magnetic fields are perpendicular to each other, induced electromotive force is avoided, magnetic field coupling with the stirring coil is avoided, the heating coil is decoupled in a mode of being perpendicularly arranged with the stirring coil, so that melting and heat preservation can be carried out while stirring is carried out, mutual influence due to electromagnetic field coupling is avoided, and electromagnetic heating and stirring of the smelting furnace can be simultaneously realized.

Description

Device capable of simultaneously realizing electromagnetic heating and electromagnetic stirring and control method

Technical Field

The disclosure relates to the related technical field of non-ferrous metal smelting equipment, in particular to a device capable of realizing electromagnetic heating and electromagnetic stirring simultaneously and a control method.

Background

The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.

Stirring is an important process measure in the smelting process. Effective stirring of the melt increases the reaction rate of metallurgy, improves heat and mass transfer processes, and is a key factor in increasing production efficiency, improving quality and reducing cost. Whether the stirring is sufficient or not directly determines the quality of the smelting product. The stirring mode includes manual stirring, gas stirring, mechanical stirring, electromagnetic stirring and the like, wherein the electromagnetic stirring is gradually popularized due to the advantages of full stirring, simple and convenient operation, low labor intensity and the like.

The working principle of electromagnetic stirring is as follows: the frequency conversion power supply transmits ultralow frequency alternating current to an induction coil of the electromagnetic inductor, and an iron core of the inductor generates a traveling wave magnetic field. When the traveling wave magnetic field penetrates through the bottom wall of the smelting furnace and acts on the molten metal, the molten metal can regularly flow under the action of Lorentz magnetic force, so that the purpose of stirring the molten metal is achieved, and the quality problems of segregation, shrinkage cavity, formation of columnar crystals and the like of metal products can be effectively solved. Therefore, to realize non-contact stirring of a smelting solution (such as an aluminum solution), a stirring coil needs to be wound around the aluminum smelting furnace, however, the traditional heating mode of the aluminum smelting furnace is electromagnetic heating or resistance wire heating, in order to avoid electromagnetic coupling between the stirring coil and the traditional electromagnetic heating coil or resistance coil and influence the safe operation of equipment, the traditional aluminum smelting furnace with an electromagnetic stirring function mostly adopts a time-sharing working mode, namely, when the heating function of the smelting furnace is started, the stirring power supply is turned off, and the stirring power supply is completely disconnected from a load coil thereof, so that the stirring power supply is prevented from being damaged by mutual-inductance high voltage; similarly, when the stirring function of the aluminum melting furnace is started, the heating power supply is turned off, and in order to prevent the heating power supply from being damaged due to the high voltage generated in the heating coil when the stirring power supply works, the heating power supply also needs to be thoroughly isolated when the stirring function is started. Particularly, in a high-end aluminum material production process, the temperature plays an important role in the reaction of the alloy components, and the accuracy of temperature control determines the physical and chemical properties of the aluminum alloy reactant to a certain extent. Obviously, the traditional heating and stirring mode cannot realize accurate temperature control, and frequent switching of two sets of power supply systems affects the service life of a switch device and increases the failure rate of equipment.

Disclosure of Invention

In order to solve the above problems, the present disclosure provides a device and a control method capable of simultaneously implementing electromagnetic heating and electromagnetic stirring, which can simultaneously implement electromagnetic heating and stirring of a smelting furnace, and the heating power and the stirring strength of the device can be continuously adjusted, and can implement functions of heating, constant temperature, stirring, and the like.

In order to achieve the purpose, the following technical scheme is adopted in the disclosure:

one or more embodiments provide a device that can realize electromagnetic heating and electromagnetic stirring simultaneously, including setting up the double-deck coil outside treating the heating body, wherein one deck coil encircles the vertical setting of treating the heating body, and another deck coil encircles the horizontal setting of treating the heating body.

One or more embodiments provide a control method of an apparatus capable of simultaneously achieving electromagnetic heating and electromagnetic stirring, including the steps of:

dividing the whole smelting process into a plurality of sections, and setting heating parameters and stirring parameters in each section;

turning on a heating power supply to heat according to heating parameters and starting a stirring power supply to stir according to stirring parameters aiming at each section of the smelting process; until the smelting process is completed.

Compared with the prior art, this disclosed beneficial effect does:

the device is provided with double-layer coils surrounding the body to be heated, one layer of the coils is used for heating, the other layer of the coils is used for stirring, the two magnetic fields are perpendicular to each other, no induced electromotive force exists, the magnetic field coupling with the stirring coils is avoided, the heating coils are decoupled in a mode of being perpendicular to the stirring coils, so that the melting and heat preservation can be carried out while stirring is carried out, and the mutual influence caused by the electromagnetic field coupling can be avoided.

Advantages of the present disclosure, as well as advantages of additional aspects, will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure.

FIG. 1 is a schematic view of the structure of the apparatus of the disclosed example 1;

fig. 2 is a magnetic field schematic diagram of a heating coil of embodiment 1 of the present disclosure;

FIG. 3 is a schematic magnetic field diagram of a stirring coil of example 1 of the present disclosure;

fig. 4 is a block diagram of a control unit structure of embodiment 1 of the present disclosure;

wherein: 1. furnace body, 2, heating coil, 3, stirring coil, 4, yoke, 5, temperature sensor.

Detailed Description

The present disclosure is further described with reference to the following drawings and examples.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments in the present disclosure may be combined with each other. The embodiments will be described in detail below with reference to the accompanying drawings.

Example 1

In one or more embodiments, as shown in fig. 1 to 4, an apparatus capable of simultaneously performing electromagnetic heating and electromagnetic stirring includes two layers of coils disposed outside a body to be heated, wherein one layer of coils is vertically disposed around the body to be heated, and the other layer of coils is horizontally disposed around the body to be heated.

The device of this embodiment has set up the double-deck coil that encircles outside the body that waits to heat, and one deck coil is used for realizing the heating, and another deck coil is used for realizing the stirring, and the two magnetic field is mutually perpendicular, and no induced electromotive force avoids coupling with stirring coil magnetic field, and heating coil adopts and decouples with the mode that stirring coil vertical arrangement, can smelt the heat preservation like this when the stirring, can not influence each other because electromagnetic field coupling.

In some embodiments, the double-layer coil may achieve heating for the inner layer and stirring for the outer layer; alternatively, the inner layer may be agitated and the outer layer heated.

In a specific arrangement mode, the outer-layer coil is a stirring coil 3 and is arranged on the outer layer of the inner-layer coil in a surrounding mode in the horizontal direction; the inner coil is a heating coil 2 which is arranged on the outer layer of the furnace body 1 to be heated in a vertical reciprocating surrounding way.

In the setting mode, the magnetic field direction of the heating coil 2 is the horizontal direction vertical to the side wall of the furnace body 1, the magnetic field direction of the stirring coil 3 is the vertical direction, the magnetic fields are mutually vertical, and no induced electromotive force exists.

Optionally, the outer coil includes three stirring coils 3, and three stirring coils 3 of three group adopt star type connected mode, and three stirring coil 3's of group one end are connected, and the other end connects the three-phase output of the stirring power that stirring coil 3 connects respectively. As shown in fig. 3, the magnetic field distribution of the outer coil is in the vertical direction.

Specifically, the stirring power supply can adopt a variable frequency power supply, wherein the variable frequency power supply can adopt an alternating-current and orthogonal mode or an alternating-current and alternating-current variable frequency mode, and parameters such as stirring frequency, stirring intensity, stirring time, reversing time and the like can be set independently according to actual process requirements.

Further technical scheme still includes yoke 4, yoke 4 encircles and sets up the 1 outsides of treating heating furnace body, and yoke 4 includes a plurality of recesses, stirring coil 3 sets up in the recess of yoke 4. The magnetic yoke 4 is added in the middle of the stirring coil 3 to improve the strength of the stirring magnetic field.

In some examples, the heating coil embodiment 2 adopts a vertically reciprocating structure, and may have a wave shape, a saw-tooth wave shape, or a rectangular wave shape. In the case of a rectangular wave shape, the lateral side is much smaller than the vertical side, wherein the lateral side is the side in the same direction as the agitating coil, as shown in fig. 2, the heating coil 2 includes three phases ABC, the magnetic field direction of the heating coil 2 is the horizontal direction, and the midpoint and cross indicate the direction of the magnetic field, respectively.

Alternatively, the inner layer comprises three independent heating coils 2, one end of each heating coil 2 is connected to the three-phase output of the heating power supply, and the other end of each heating coil 2 is grounded.

Optionally, for a low-power heating furnace, three independent heating coils 2 are connected in series and then connected with a single-phase heating power supply.

Specifically, the heating coil 2 may be an industrial resistance wire.

Optionally, the input of the heating power supply is a three-phase power grid, the heating power supply can adopt a three-phase voltage regulating or three-phase power regulating circuit, and the regulation of the heating power is realized by controlling the conduction angle of the thyristor.

The heating coil 2 of the embodiment has a structure that the furnace body 1 can be heated uniformly, and a vertical structure can avoid magnetic field coupling when the outer heating coil 2 works.

Optionally, the body to be heated may be a melting device, such as a melting furnace, or may be a heat-preserving device, such as a heat-preserving furnace.

In order to realize the automatic control of the system, the system may further comprise a control unit, as shown in fig. 4, the control unit comprises a controller and a temperature sensor 5, and the temperature sensor 5, the heating power supply and the stirring power supply are respectively connected with the main controller.

Specifically, the main controller may be connected to a voltage regulating or power regulating circuit of the heating power supply;

the temperature sensor 5 is arranged on the furnace body 1 to be heated, detects the temperature of the furnace body 1, transmits the detected temperature information to the main controller, and the main controller controls the on-off of the heating power supply according to the temperature information.

Furthermore, the control unit further comprises an interaction device and a cloud platform, wherein the interaction device and the cloud platform are in communication connection with the main controller respectively.

Specifically, the master controller can be connected to the cloud platform through the internet of things module;

in particular, the interaction means may be embodied as an HMI human machine interface, which may be used for inputting heating parameters and stirring parameters.

The main controller is configured to be used for achieving functions of logic control, storage and calling of segmented control parameters, data interaction of the variable-frequency power supply and the power adjusting circuit, data interaction of an HMI human-computer interface, data interaction of the Internet of things module and the like.

The device of this embodiment, in the middle of will heating and stirring control integrated to a main control unit, can accurate control heating temperature to can set up the intensification curve, can make segmentation processing to the intensification curve, the start-stop and the setting of stirring dynamics, stirring direction of every section curve cooperation stirring really realize the accurate integration of temperature, stirring dynamics, stirring speed, stirring direction, realize smelting and stir the intelligent of accurate combination and smelt.

Example 2

Based on embodiment 1, this embodiment provides a control method for an apparatus capable of simultaneously implementing electromagnetic heating and electromagnetic stirring, which can be implemented in a main controller, and includes the following steps:

step 1, dividing the whole smelting process into N sections, wherein each section is provided with heating parameters and stirring parameters;

step 2, turning on a heating power supply to heat according to heating parameters and starting a stirring power supply to stir according to stirring parameters aiming at each section of the smelting process; until all segments of the smelting process are completed.

Optionally, the smelting process is divided into N stages, which can be set by time, including the start time and end time of each stage.

Alternatively, the heating parameters may include a temperature rise profile for each segment.

Optionally, the heating power supply is turned on to heat according to the heating parameters, and the method includes the step of controlling the temperature according to the set temperature parameters, specifically: and setting a temperature rise curve, acquiring a temperature signal of the furnace body 1 to be heated, and adjusting the output current of the heating power supply according to the set temperature rise curve and the acquired temperature signal.

In some embodiments, the agitation parameters may include agitation start and stop times, agitation intensity, agitation speed, and agitation direction.

Optionally, the stirring force is controlled by controlling the output current of the variable frequency power supply, the stirring speed is realized by controlling the frequency of the variable frequency power supply, the stirring direction is realized by controlling the phase sequence of the variable frequency power supply, and the stirring start and stop are realized by controlling the start and stop of the variable frequency power supply.

The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Although the embodiments of the present disclosure have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present disclosure, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive changes in the technical solutions of the present disclosure.

Claims

1. The utility model provides a can realize electromagnetic heating and electromagnetic stirring's device simultaneously which characterized in that: the heating device comprises double-layer coils arranged outside a body to be heated, wherein one layer of coils is vertically arranged around the body to be heated, and the other layer of coils is transversely arranged around the body to be heated;

the inner coil of the double-layer coil realizes heating, and the outer coil realizes stirring; or the inner coil of the double-layer coil realizes stirring, and the outer coil realizes heating;

the outer layer coil in the double-layer coil is a stirring coil and is arranged on the outer layer of the inner layer coil in a surrounding manner in the horizontal direction; the inner layer coil in the double-layer coil is a heating coil and is arranged on the outer layer of the furnace body to be heated in a vertically reciprocating manner in a surrounding manner;

the stirring furnace also comprises a magnetic yoke, wherein the magnetic yoke is arranged on the outer side of the furnace body to be heated in a surrounding manner, the magnetic yoke comprises a plurality of grooves, and the stirring coil is arranged in the groove of the magnetic yoke;

the heating device is characterized by further comprising a control unit, wherein the control unit comprises a controller and a temperature sensor, and the temperature sensor, the heating power supply and the stirring power supply are respectively connected with the main controller.

2. The device for simultaneously realizing electromagnetic heating and electromagnetic stirring as claimed in claim 1, wherein: the outer-layer coil comprises three groups of stirring coils, the three groups of stirring coils are connected in a star-shaped manner, one ends of the three groups of stirring coils are connected, and the other ends of the three groups of stirring coils are respectively connected with three-phase outputs of a stirring power supply connected with the stirring coils;

or the stirring power supply adopts a variable frequency power supply.

3. The apparatus for simultaneously performing electromagnetic heating and electromagnetic stirring as recited in claim 1, wherein: the heating coil adopts a vertical reciprocating structure and is in a wave shape, a sawtooth wave shape or a rectangular wave shape.

4. The apparatus for simultaneously performing electromagnetic heating and electromagnetic stirring as recited in claim 1, wherein: the control unit further comprises an interaction device and a cloud platform, wherein the interaction device and the cloud platform are respectively in communication connection with the main controller;

or the interaction device is specifically an HMI (human machine interface).

5. A control method of a device capable of realizing electromagnetic heating and electromagnetic stirring simultaneously is characterized by comprising the following steps:

6. The method for controlling an apparatus capable of simultaneously performing electromagnetic heating and electromagnetic stirring according to claim 5, wherein:

the heating parameters comprise a temperature rise curve of each section;

or, turning on the heating power supply to heat according to the heating parameters, including the step of controlling the temperature according to the set temperature parameters, specifically: setting a temperature rise curve, acquiring a temperature signal of the furnace body to be heated, and adjusting the output current of a heating power supply according to the set temperature rise curve and the acquired temperature signal;

or the stirring parameters comprise stirring start-stop time, stirring force, stirring speed and stirring direction;

or the stirring strength is controlled by controlling the output current of the variable frequency power supply, the stirring speed is realized by controlling the frequency of the variable frequency power supply, the stirring direction is realized by controlling the phase sequence of the variable frequency power supply, and the stirring start and stop are realized by controlling the start and stop of the variable frequency power supply.