Scrap steel preheating device

Abstract

The utility model discloses a scrap steel preheating device, which relates to the field of metal smelting and comprises a horizontal feeding device, a rotary kiln body and an electric arc furnace. The horizontal feeding device extends in the horizontal direction and is used for receiving waste steel and conveying the waste steel to an inlet of the rotary kiln body. An outlet of the horizontal feeding device is communicated with an inlet of the rotary kiln body; an outlet of the rotary kiln body is connected with a material inlet of the electric arc furnace; the electric arc furnace is provided with a smoke outlet, and the smoke outlet is communicated with the interior of the rotary kiln body. The preheating efficiency of the scrap steel can be improved on the premise that safety is guaranteed, and energy consumption is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of metal smelting, in particular to a scrap steel preheating device. Background Art

[0002] In the context of green production, electric arc furnace steelmaking has become an important means of steelmaking in the current industry due to its advantages of short process, low energy consumption and low carbon emissions. Electric arc furnace steelmaking can use scrap steel as the main steelmaking raw material, and the technology of preheating scrap steel has become an important means of reducing costs, increasing efficiency, and saving energy and reducing consumption in electric furnaces. Therefore, scrap steel preheating technology is one of the key research focuses of electric arc furnace steelmaking technology.

[0003] At present, the main methods of scrap preheating are horizontal preheating and shaft preheating. The furnace type corresponding to the shaft preheating method has the characteristics of good preheating effect, but it also has problems such as insufficient secondary combustion and high equipment failure rate; the furnace type corresponding to the horizontal preheating method has the advantages of continuous feeding, long service life, and equipment avoiding high temperature radiation, but its preheating effect is relatively poor and the energy saving effect is not obvious. Therefore, it is urgent to develop a new type of scrap preheating device to improve the preheating efficiency of scrap steel while ensuring safety. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present utility model is to provide a scrap steel preheating device, which can improve the preheating efficiency of scrap steel while ensuring safety and effectively save energy consumption.

[0005] The specific technical solution of the embodiment of the utility model is:

[0006] A scrap steel preheating device, comprising:

[0007] Horizontal charging devices, rotary kilns and electric arc furnaces;

[0008] The horizontal feeding device extends in the horizontal direction, and is used to receive scrap steel and transport the scrap steel to the inlet of the rotary kiln body; the outlet of the horizontal feeding device is connected to the inlet of the rotary kiln body; the outlet of the rotary kiln body is connected to the material inlet of the electric arc furnace; the electric arc furnace has a smoke outlet, and the smoke outlet is connected to the inside of the rotary kiln body.

[0009] Preferably, the electric arc furnace comprises a furnace body having a containing cavity and a cover body capable of sealing the containing cavity of the furnace body; and the smoke outlet is located on the cover body.

[0010] Preferably, a scrap steel channel is formed between the outlet of the rotary kiln body and the inlet of the rotary kiln body, and the height of the scrap steel channel increases from the outlet of the rotary kiln body to the inlet of the rotary kiln body. When the rotary kiln body is in a rotating state, the scrap steel in the scrap steel channel gradually rotates with the rotation of the rotary kiln body and moves toward the outlet of the rotary kiln body.

[0011] The smoke outlet is communicated with the outlet of the rotary kiln body.

[0012] Preferably, the cover body has an opening, and the opening forms both the material inlet and the smoke outlet.

[0013] Preferably, the outlet of the rotary kiln body is connected to the material inlet of the electric arc furnace through a guide groove mechanism, the guide groove mechanism extends in a vertical direction, the upper end of the guide groove mechanism is sealedly connected to the outlet of the rotary kiln body, and the lower end of the guide groove mechanism is sealedly connected to the opening of the cover body; the side walls around the guide groove mechanism have sealing properties.

[0014] Preferably, a scrap steel channel is formed between the outlet of the rotary kiln body and the inlet of the rotary kiln body;

[0015] The scrap steel preheating device also includes:

[0016] The electromagnetic induction heating device is used for heating the scrap steel passing through the rotary kiln body, and the electromagnetic induction heating device comprises: an electromagnetic heating coil sleeved outside the scrap steel channel; and an electromagnetic heating controller electrically connected to the electromagnetic heating coil.

[0017] Preferably, the scrap steel preheating device further comprises:

[0018] a high-temperature imaging temperature measuring device electrically connected to the electromagnetic heating controller, wherein the high-temperature imaging temperature measuring device is used to monitor the temperature of the scrap steel at the outlet of the scrap steel channel passing through the rotary kiln body; and the electromagnetic heating controller controls the heating power of the electromagnetic heating coil to the scrap steel in the scrap steel channel according to the temperature of the scrap steel monitored by the high-temperature imaging temperature measuring device, so as to control the temperature of the scrap steel at the outlet of the scrap steel channel to be between 500 degrees Celsius and 700 degrees Celsius.

[0019] Preferably, the electromagnetic heating coil is arranged outside the rotary kiln body; or, the electromagnetic heating coil is arranged inside the side wall of the rotary kiln body.

[0020] Preferably, there are multiple scrap steel preheating devices, which are sequentially arranged along the extension direction of the scrap steel channel, and the multiple scrap steel preheating devices heat the scrap steel in different areas of the scrap steel channel respectively.

[0021] Preferably, the scrap steel preheating device further comprises: a flexible power supply device, the flexible power supply device being used to supply power to the scrap steel preheating device and / or the electric arc furnace;

[0022] The flexible power supply device is used to obtain electricity from a photovoltaic power grid, a tidal power grid or a wind power grid;

[0023] The flexible power supply device comprises:

[0024] A first filter circuit module, whose input end is used to connect to a power grid, and the first filter circuit module is an inverted L-shaped filter circuit module;

[0025] A high-frequency PWM inverter circuit module, whose input end is connected to the output end of the first filter circuit module;

[0026] A transformer, whose input end is connected to the output end of the high-frequency PWM inverter circuit;

[0027] A full-wave rectifier circuit module, whose input end is connected to the output end of the transformer;

[0028] A polarity reversal inverter bridge has an input end connected to the output end of the full-wave rectifier circuit module.

[0029] Preferably, the scrap steel preheating device further comprises: a flexible power supply device, the flexible power supply device being used to supply power to the scrap steel preheating device and / or the electric arc furnace;

[0030] The flexible power supply device is used to obtain electricity from a photovoltaic power grid, a tidal power grid or a wind power grid;

[0031] The flexible power supply device comprises:

[0032] A first filter circuit module, whose input end is used to connect to a power grid, and the first filter circuit module is a C-type filter circuit module;

[0033] A high-frequency PWM inverter circuit module, whose input end is connected to the output end of the first filter circuit module;

[0034] A transformer, whose input end is connected to the output end of the high-frequency PWM inverter circuit;

[0035] A full-wave rectifier circuit module, whose input end is connected to the output end of the transformer;

[0036] An industrial frequency PWM inverter circuit module, whose input end is connected to the output end of the full-wave rectifier circuit module;

[0037] The second filter circuit module has an input end connected to the output end of the industrial frequency PWM inverter circuit module, and the second filter circuit module is an inverted L-shaped filter circuit module.

[0038] The technical solution of the utility model has the following significant beneficial effects:

[0039] The horizontal feeding device in the present application receives scrap steel and transports the scrap steel to the inlet of the rotary kiln body. After the scrap steel enters the rotary kiln body, the scrap steel in the rotary kiln body is output from the outlet of the rotary kiln body through the rotation of the rotary kiln body; when the scrap steel is output from the outlet of the rotary kiln body, the scrap steel enters the electric arc furnace through the material inlet of the electric arc furnace, thereby being smelted. During smelting, a certain amount of high-temperature flue gas is generated in the electric arc furnace. The high-temperature flue gas generated in the electric arc furnace is flowed into the interior of the rotary kiln body through the flue gas outlet, thereby preheating the scrap steel passing through the interior of the rotary kiln body. The preheated scrap steel can reach a certain temperature, thereby reducing the time for the scrap steel to continue to be heated and smelted after entering the electric arc furnace, thereby improving the smelting efficiency of the scrap steel. The above method also recovers the waste heat of the flue gas in the electric arc furnace, reducing energy consumption and production costs.

[0040] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and / or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or replace features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0042] Figure 1 It is an overall schematic diagram of the scrap steel preheating device in the embodiment of the utility model;

[0043] Figure 2 This is a schematic diagram of the structure of the horizontal feeding device in the embodiment of the utility model;

[0044] Figure 3 It is a schematic structural diagram of the rotary kiln body and the electric arc furnace in the embodiment of the utility model;

[0045] Figure 4 This is a schematic diagram of the structure of the electromagnetic heating controller in the first embodiment of the utility model;

[0046] Figure 5It is a schematic structural diagram of the electromagnetic heating controller in the second implementation mode of the utility model embodiment.

[0047] Reference numerals in the above drawings:

[0048] 1. Horizontal feeding device; 2. Rotary kiln body; 21. Scrap steel channel; 3. Electric arc furnace; 31. Furnace body; 32. Cover body; 4. Guide groove mechanism; 5. Electromagnetic induction heating device; 51. Electromagnetic heating coil; 52. Electromagnetic heating controller; 6. High-temperature imaging temperature measuring device; 7. Flexible power supply device; 71. First filter circuit module; 72. High-frequency PWM inverter circuit module; 73. Transformer; 74. Full-wave rectifier circuit module; 75. Polarity reversal inverter bridge; 76. Industrial frequency PWM inverter circuit module; 77. Second filter circuit module; 8. Flue gas dust removal device. DETAILED DESCRIPTION

[0049] In combination with the accompanying drawings and the description of the specific embodiments of the present invention, the details of the present invention can be more clearly understood. However, the specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "disposed on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0051] In order to improve the preheating efficiency of scrap steel while ensuring safety and effectively save energy consumption, a scrap steel preheating device is proposed in this application. Figure 1This is an overall schematic diagram of the scrap steel preheating device in the embodiment of the utility model. Figure 2 This is a schematic diagram of the structure of the horizontal feeding device in the embodiment of the utility model. Figure 3 FIG. 1 is a schematic diagram of the structure of the rotary kiln body and the electric arc furnace in the embodiment of the utility model. Figures 1 to 3 As shown, the scrap steel preheating device may include: a horizontal charging device 1, a rotary kiln body 2 and an electric arc furnace 3.

[0052] Among them, the horizontal feeding device 1 extends in the horizontal direction, which is used to receive scrap steel and transport the scrap steel to the inlet of the rotary kiln body 2. In order to facilitate the horizontal feeding device 1 to receive scrap steel uninterruptedly and conveniently and transport it to the inlet of the rotary kiln body 2, as a preferred embodiment, the horizontal feeding device 1 can adopt a horizontal vibration feeding device, so that the scrap steel can be loaded on the transportation track of the horizontal vibration feeding device by the scrap steel yard crane. The transportation track extends in the horizontal direction and has a long length. The transportation track can receive the scrap steel transported by the crane. The transportation mechanism on the transportation track transports the scrap steel in a vibrating manner, that is, the transportation mechanism moves forward slowly, thereby driving the scrap steel to move forward, and then moves backward quickly. At this time, due to inertia, the scrap steel will not move backward, and this continuous cycle is realized to move the scrap steel forward. This method allows the scrap steel to move forward with the transportation mechanism, and when the transportation mechanism vibrates backward, the scrap steel slides over its surface again, so that the scrap steel can be transported uninterruptedly in the horizontal vibration feeding device. The advantage of the horizontal vibrating feeding device is that it can transport materials continuously without material jamming.

[0053] The outlet of the horizontal feeding device 1 is connected to the inlet of the rotary kiln body 2, so that the scrap steel outputted from the outlet of the horizontal feeding device 1 can enter the inlet of the rotary kiln body 2. For example, the outlet of the horizontal feeding device 1 can extend into the inlet of the rotary kiln body 2, so that the scrap steel outputted from the outlet of the horizontal feeding device 1 directly falls into the rotary kiln body 2 without the need for other auxiliary devices. After the scrap steel enters the rotary kiln body 2, the scrap steel in the rotary kiln body 2 is outputted from the outlet of the rotary kiln body 2 through the rotation of the rotary kiln body 2.

[0054] A scrap steel channel 21 is formed between the outlet of the rotary kiln body 2 and the inlet of the rotary kiln body 2, and the height of the scrap steel channel 21 increases from the outlet of the rotary kiln body 2 to the inlet of the rotary kiln body 2. With the above structure, when the rotary kiln body 2 is in a rotating state, the scrap steel in the scrap steel channel 21 gradually rotates with the rotation of the rotary kiln body 2 and moves toward the outlet of the rotary kiln body 2.

[0055] In order to enable the rotary kiln body 2 to rotate around its own axis, the outer wall of the rotary kiln body 2 can be connected to a gear ring around its circumferential direction, and the teeth on the gear ring cooperate with the gear on the driving unit. When the driving unit rotates, the gear rotates, thereby driving the gear ring to rotate, and then driving the entire rotary kiln body 2 to rotate. The above structure can be arranged in sequence in the axial direction of the rotary kiln body 2. On the one hand, it drives the rotary kiln body 2 to rotate, and on the other hand, it can play a certain supporting role for the rotary kiln body 2. For example, at the same position in the direction of the axis of the rotary kiln body 2, a driving unit can be arranged on both sides of the gear ring of the rotary kiln body 2, so that the rotary kiln body 2 is supported between the two driving units.

[0056] The outlet of the rotary kiln body 2 is connected to the material inlet of the electric arc furnace 3. After the scrap steel is output from the outlet of the rotary kiln body 2, the scrap steel enters the electric arc furnace 3 through the material inlet of the electric arc furnace 3, thereby being smelted.

[0057] The electric arc furnace 3 may include a furnace body 31 having a receiving cavity and a cover body 32 capable of sealing the receiving cavity of the furnace body 31. Scrap steel enters the receiving cavity of the furnace body 31 for smelting. During smelting, the cover body 32 seals the receiving cavity of the furnace body 31, and the electrode of the electric arc furnace 3 is inserted into the receiving cavity. The arc generated between the electrode end and the charge (including scrap steel) is used as a heat source to heat the charge until the scrap steel is melted and reaches the required temperature requirement, so as to carry out steelmaking. During this period, a certain amount of high-temperature flue gas is generated in the electric arc furnace 3. The electric arc furnace 3 may have a flue gas outlet, which is connected to the inside of the rotary kiln body 2. The high-temperature flue gas generated in the electric arc furnace 3 can be flowed into the inside of the rotary kiln body 2 by the flue gas outlet, so as to preheat the scrap steel passing through the inside of the rotary kiln body 2. The preheated scrap steel can reach a certain temperature, so that the time for the scrap steel to continue to be heated and smelted after entering the electric arc furnace 3 can be reduced, thereby improving the smelting efficiency of the scrap steel. The above method also recovers the waste heat of the flue gas in the electric arc furnace 3, thereby reducing energy consumption and production costs.

[0058] Furthermore, the cover 32 may have an opening. The opening forms both a material inlet and a smoke outlet. By the above method, the number of openings on the cover 32 can be reduced, thereby reducing the amount of heat in the electric arc furnace 3 leaking from the openings, thereby reducing energy consumption.

[0059] In order to allow the scrap steel output from the outlet of the rotary kiln body 2 to directly enter the material inlet of the electric arc furnace 3 and then enter the electric arc furnace 3, and to allow the smoke in the electric arc furnace 3 to enter the rotary kiln body 2, the outlet of the rotary kiln body 2 can be connected to the material inlet of the electric arc furnace 3 through a guide groove mechanism 4, the guide groove mechanism 4 extends in the vertical direction, the upper end of the guide groove mechanism 4 is sealed and connected to the outlet of the rotary kiln body 2, and the lower end of the guide groove mechanism 4 is sealed and connected to the opening of the cover body 32. The side walls around the guide groove mechanism 4 have sealing properties. Through the above structure, it can also be ensured that the smoke in the electric arc furnace 3 basically does not leak during the process of entering the rotary kiln body 2 through the guide groove mechanism 4.

[0060] In the above structure, the flue gas in the electric arc furnace 3 first enters the outlet (scrap steel outlet) of the rotary kiln body 2, and then reaches the other end of the rotary kiln body 2 through the scrap steel channel 21 in the rotary kiln body 2 for discharge, that is, the inlet (scrap steel inlet) of the rotary kiln body 2. In this process, the flue gas with the relatively highest temperature preferentially preheats the scrap steel at the outlet of the rotary kiln body 2, so that the scrap steel output from the outlet of the rotary kiln body 2 can be preheated to the highest possible temperature. In the process of the flue gas passing through the scrap steel channel 21 in the rotary kiln body 2 and reaching the other end of the rotary kiln body 2 for discharge, the scrap steel in the scrap steel channel 21 in the rotary kiln body 2 can be continuously preheated, and the waste heat of the flue gas of the electric arc furnace 3 can be recovered as much as possible, thereby reducing energy consumption and production costs.

[0061] When the flue gas first enters the outlet of the rotary kiln body 2 (scrap steel outlet) and then reaches the other end of the rotary kiln body 2 through the scrap steel channel 21 in the rotary kiln body 2 and is discharged to the outside, a flue gas dust removal device 8 may be provided at the connection between the outlet of the horizontal feeding device 1 and the inlet of the rotary kiln body 2. The inlet of the flue gas dust removal device 8 covers the connection between the outlet of the horizontal feeding device 1 and the inlet of the rotary kiln body 2, so that the flue gas discharged from the other end of the rotary kiln body 2 basically all enters the flue gas dust removal device 8 for dust removal treatment, and the flue gas after dust removal treatment is then discharged to the outside atmosphere.

[0062] When an anti-emission hood is provided on the transport track of the horizontal feeding device 1, the flue gas can enter the anti-emission hood of the horizontal feeding device 1 after passing through the scrap steel channel 21 in the rotary kiln body 2 and reaching the other end of the rotary kiln body 2. The flue gas flows in the anti-emission hood along the extension direction of the transport track, and it can still preheat the scrap steel on the transport track in a small amount, thereby further fully recovering the waste heat of the flue gas in the electric arc furnace 3.

[0063] As feasible, in order to further preheat the scrap steel when it passes through the rotary kiln body 2, the scrap steel preheating device may include: an electromagnetic induction heating device 5 for heating the scrap steel passing through the rotary kiln body 2, and the electromagnetic induction heating device 5 includes: an electromagnetic heating coil 51 sleeved outside the scrap steel channel 21; and an electromagnetic heating controller 52 electrically connected to the electromagnetic heating coil 51. The electromagnetic heating controller 52 is used to supply power to the electromagnetic heating coil 51 and control its heating power.

[0064] As a feasible method, there are multiple scrap steel preheating devices, and the multiple scrap steel preheating devices are sequentially arranged along the extension direction of the scrap steel channel 21 , and the multiple scrap steel preheating devices heat the scrap steel in different areas of the scrap steel channel 21 respectively.

[0065] As feasible, the electromagnetic heating coil 51 can be sleeved outside the rotary kiln body 2. Alternatively, the electromagnetic heating coil 51 can be arranged inside the side wall of the rotary kiln body 2.

[0066] The method of heating the scrap steel passing through the rotary kiln body 2 by the electromagnetic induction heating device 5 can realize contactless heating of the scrap steel, without generating open flames and exhaust gas, and without pollution to the environment. Now, for the prior art, the scrap steel in the rotary kiln body 2 can be heated without using gas, which greatly reduces the energy consumption and the emission problem of tail gas generated after the combustion of gas. The scrap steel passing through the rotary kiln body 2 is heated by the electromagnetic induction heating device 5 using an internal heat heating method, and the thermal efficiency is as high as more than 95%. Compared with the traditional resistance coil heating method, 30%-70% of electricity can be saved. The scrap steel passing through the rotary kiln body 2 is heated by the electromagnetic induction heating device 5. It also has the advantage of rapid heating. The scrap steel itself is heated by electromagnetic induction, and the average preheating time is shortened by 2 / 3 compared with the resistance coil heating method. The scrap steel passing through the rotary kiln body 2 can be heated by the electromagnetic induction heating device 5. The scrap steel can be fully and evenly heated by the electromagnetic induction heating device 5, and there will be no heating dead corners, and some scrap steel cannot be fully preheated. The electromagnetic induction heating device 5 heats the scrap steel passing through the rotary kiln body 2 only so that the scrap steel in the rotary kiln body 2 is at a higher temperature after preheating. The surface of the electromagnetic induction heating device 5 is at room temperature and can be touched by the human body, which can reduce the high temperature environment caused by the traditional heating method and improve the working comfort. The electromagnetic induction heating device 5 heats the scrap steel passing through the rotary kiln body 2 to facilitate the realization of automatic control. The heating power, temperature and time can be adjusted as needed to improve production efficiency and product quality. For example, when the amount of scrap steel passing through the scrap steel channel 21 is large in a certain period of time, the electromagnetic induction heating device 5 can immediately increase the heating power, thereby immediately increasing the heat absorbed by the scrap steel passing through the scrap steel channel 21, thereby maintaining the original temperature requirement for preheating.

[0067] As feasible, the scrap steel preheating device may include: a high temperature imaging temperature measuring device 6 electrically connected to the electromagnetic heating controller 52. The high temperature imaging temperature measuring device 6 is used to monitor the temperature of the scrap steel at the outlet of the scrap steel channel 21 passing through the rotary kiln body 2. The electromagnetic heating controller 52 can control the heating power of the electromagnetic heating coil 51 to the scrap steel in the scrap steel channel 21 according to the temperature of the scrap steel monitored by the high temperature imaging temperature measuring device 6, so as to control the temperature of the scrap steel at the outlet of the scrap steel channel 21 to be between 500 degrees Celsius and 700 degrees Celsius. The scrap steel in the rotary kiln body 2 can be monitored in real time by the high temperature imaging temperature measuring device 6, so as to control the heating power of the electromagnetic heating controller 52. In particular, the temperature of the scrap steel to be discharged at the outlet of the scrap steel channel 21 can be monitored. Once the temperature is too low or too high, the electromagnetic heating controller 52 can immediately control the heating power of the electromagnetic heating coil 51 to the scrap steel in the scrap steel channel 21, so that the scrap steel passing through the scrap steel channel 21 is heated to a suitable degree, so that the scrap steel is heated to the required temperature just when it reaches the outlet of the scrap steel channel 21.

[0068] The high-temperature imaging temperature measuring device 6 is used to monitor the scrap steel in the rotary kiln body 2 in real time, which can not only accurately obtain the temperature of the scrap steel in each area of ​​the rotary kiln body 2, but also effectively avoid contact between the temperature measuring device and the scrap steel, which is safer and more reliable.

[0069] The scrap steel preheating device may include: a flexible power supply device 7, which is used to supply power to the scrap steel preheating device and / or the electric arc furnace 3. The flexible power supply device 7 may be used to obtain power from a photovoltaic power grid, a tidal power grid or a wind power grid, thereby ensuring that the power supply of the scrap steel preheating device is a green and clean power supply, thereby reducing energy costs and carbon emissions.

[0070] In one possible implementation, Figure 4 FIG. 1 is a schematic diagram of the structure of the electromagnetic heating controller in the first embodiment of the utility model. Figure 4 As shown, the flexible power supply device 7 includes: a first filter circuit module 71, whose input end is used to connect to the power grid, and the first filter circuit module 71 is an inverted L-shaped filter circuit module; a high-frequency PWM inverter circuit module 72, whose input end is connected to the output end of the first filter circuit module 71; a transformer 73, whose input end is connected to the output end of the high-frequency PWM inverter circuit; a full-wave rectifier circuit module 74, whose input end is connected to the output end of the transformer 73; and a polarity reversal inverter bridge 75, whose input end is connected to the output end of the full-wave rectifier circuit module 74. The output end of the polarity reversal inverter bridge 75 is used to connect to an electrical device.

[0071] In another possible implementation, Figure 5 FIG. 1 is a schematic diagram of the structure of the electromagnetic heating controller in the second embodiment of the utility model. Figure 5 As shown, the flexible power supply device 7 includes: a first filter circuit module 71, whose input end is used to connect to the power grid, and the first filter circuit module 71 is a C-type filter circuit module; a high-frequency PWM inverter circuit module 72, whose input end is connected to the output end of the first filter circuit module 71; a transformer 73, whose input end is connected to the output end of the high-frequency PWM inverter circuit; a full-wave rectifier circuit module 74, whose input end is connected to the output end of the transformer 73; an industrial frequency PWM inverter circuit module 76, whose input end is connected to the output end of the full-wave rectifier circuit module 74; a second filter circuit module 77, whose input end is connected to the output end of the industrial frequency PWM inverter circuit module 76, and the second filter circuit module 77 is an inverted L-type filter circuit module. The output end of the two filter circuit modules is used to connect to the power-consuming device.

[0072] The above-mentioned flexible power supply device 7 can meet the basic requirements of stable combustion of the arc furnace 3 and improve the electric energy utilization rate of the arc furnace 3. The flexible power supply can maintain the arc current and arc furnace power constant, thereby improving the utilization rate of electric energy. The arc furnace 3 can achieve the effect of reducing the power-on time by 10% to 15%, reducing the unit power consumption by 5% to 8%, and reducing the electrode loss by 10% to 20%. The flexible power supply device 7 can meet the core arc stable combustion, power quality control on the power supply side, control and regulation functions of the arc furnace 3, etc., and at the same time can adapt to the frequent impact of the power consumption of the arc furnace 3 and the high reliability of the power supply components under high current operating conditions.

[0073] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of ... " describing a combination should include determined elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps here also contemplates the implementation method consisting essentially of these elements, ingredients, parts or steps. Here, by using the term "may", it is intended to illustrate that any attribute described that "may" includes is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "one" used to describe an element, ingredient, part or step is not said to exclude other elements, ingredients, parts or steps.

[0074] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly, and cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A scrap steel preheating device, characterized in that: The scrap steel preheating device comprises: Horizontal charging devices, rotary kilns and electric arc furnaces; The horizontal feeding device extends in the horizontal direction, and is used to receive scrap steel and transport the scrap steel to the inlet of the rotary kiln body; the outlet of the horizontal feeding device is connected to the inlet of the rotary kiln body; the outlet of the rotary kiln body is connected to the material inlet of the electric arc furnace; the electric arc furnace has a smoke outlet, and the smoke outlet is connected to the inside of the rotary kiln body.

2. The scrap steel preheating device according to claim 1, characterized in that: The electric arc furnace comprises a furnace body with a containing cavity and a cover body capable of sealing the containing cavity of the furnace body; the smoke outlet is located on the cover body.

3. The scrap steel preheating device according to claim 1, characterized in that: A scrap steel channel is formed between the outlet of the rotary kiln body and the inlet of the rotary kiln body, the height of the scrap steel channel increases from the outlet of the rotary kiln body to the inlet of the rotary kiln body, and when the rotary kiln body is in a rotating state, the scrap steel in the scrap steel channel gradually rotates with the rotation of the rotary kiln body and moves toward the outlet of the rotary kiln body; The smoke outlet is communicated with the outlet of the rotary kiln body.

4. The scrap steel preheating device according to claim 2, characterized in that: The cover body is provided with an opening, and the opening forms both the material inlet and the smoke outlet.

5. The scrap steel preheating device according to claim 4, characterized in that: The outlet of the rotary kiln body is connected to the material inlet of the electric arc furnace through a guide groove mechanism, the guide groove mechanism extends in a vertical direction, the upper end of the guide groove mechanism is sealedly connected to the outlet of the rotary kiln body, and the lower end of the guide groove mechanism is sealedly connected to the opening of the cover body; the side walls around the guide groove mechanism have sealing properties.

6. The scrap steel preheating device according to claim 1, characterized in that: A scrap steel passage is formed between the outlet of the rotary kiln body and the inlet of the rotary kiln body; The scrap steel preheating device also includes: The electromagnetic induction heating device is used for heating the scrap steel passing through the rotary kiln body, and the electromagnetic induction heating device comprises: an electromagnetic heating coil sleeved outside the scrap steel channel; and an electromagnetic heating controller electrically connected to the electromagnetic heating coil.

7. The scrap steel preheating device according to claim 6, characterized in that: The scrap steel preheating device also includes: a high-temperature imaging temperature measuring device electrically connected to the electromagnetic heating controller, wherein the high-temperature imaging temperature measuring device is used to monitor the temperature of the scrap steel at the outlet of the scrap steel channel passing through the rotary kiln body; and the electromagnetic heating controller controls the heating power of the electromagnetic heating coil to the scrap steel in the scrap steel channel according to the temperature of the scrap steel monitored by the high-temperature imaging temperature measuring device, so as to control the temperature of the scrap steel at the outlet of the scrap steel channel to be between 500 degrees Celsius and 700 degrees Celsius.

8. The scrap steel preheating device according to claim 6, characterized in that: The electromagnetic heating coil is arranged outside the rotary kiln body; or, the electromagnetic heating coil is arranged inside the side wall of the rotary kiln body.

9. The scrap steel preheating device according to claim 6, characterized in that: There are multiple scrap steel preheating devices, which are arranged in sequence along the extension direction of the scrap steel channel, and the multiple scrap steel preheating devices heat the scrap steel in different areas of the scrap steel channel respectively.

10. The scrap steel preheating device according to claim 6, characterized in that: The scrap steel preheating device further comprises: a flexible power supply device, which is used to supply power to the scrap steel preheating device and / or the electric arc furnace; The flexible power supply device is used to obtain electricity from a photovoltaic power grid, a tidal power grid or a wind power grid; The flexible power supply device comprises: A first filter circuit module, whose input end is used to connect to a power grid, and the first filter circuit module is an inverted L-shaped filter circuit module; A high-frequency PWM inverter circuit module, whose input end is connected to the output end of the first filter circuit module; A transformer, whose input end is connected to the output end of the high-frequency PWM inverter circuit; A full-wave rectifier circuit module, whose input end is connected to the output end of the transformer; A polarity reversal inverter bridge has an input end connected to the output end of the full-wave rectifier circuit module.

11. The scrap steel preheating device according to claim 6, characterized in that: The scrap steel preheating device further comprises: a flexible power supply device, which is used to supply power to the scrap steel preheating device and / or the electric arc furnace; The flexible power supply device is used to obtain electricity from a photovoltaic power grid, a tidal power grid or a wind power grid; The flexible power supply device comprises: A first filter circuit module, whose input end is used to connect to a power grid, and the first filter circuit module is a C-type filter circuit module; A high-frequency PWM inverter circuit module, whose input end is connected to the output end of the first filter circuit module; A transformer, whose input end is connected to the output end of the high-frequency PWM inverter circuit; A full-wave rectifier circuit module, whose input end is connected to the output end of the transformer; An industrial frequency PWM inverter circuit module, whose input end is connected to the output end of the full-wave rectifier circuit module; The second filter circuit module has an input end connected to the output end of the industrial frequency PWM inverter circuit module, and the second filter circuit module is an inverted L-shaped filter circuit module.

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