Scrap steel preheating device

Abstract

The utility model provides a scrap steel preheating device, which relates to the technical field of metallurgical equipment, and comprises an electric furnace module, an induction heating module, a conveying module and a flexible power supply device, the induction heating module comprises an induction furnace, an induction coil and a support structure, and the induction coil is used for primary preheating of scrap steel in the induction furnace; the conveying module is arranged between the electric furnace and the induction heating module and can be used for conveying the waste steel preheated by the induction heating module to the electric furnace; the flexible power supply device is electrically connected with the induction heating module and / or the electric furnace module and used for taking power from the green power grid. The induction heating module can be electrically connected with a green power grid through the flexible power supply device, primary preheating is conducted on waste steel through the induction heating module, the preheating temperature of the waste steel before the waste steel enters the electric furnace can be increased to 200 DEG C or above, the initial temperature of the waste steel is remarkably increased, and therefore the smelting time of the electric furnace is greatly shortened, and the production efficiency is improved. And the overall production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical equipment technology, and in particular to a scrap steel preheating device. Background Technology

[0002] Electric arc furnace (EAF) steelmaking has gradually become one of the important methods of modern steelmaking due to its advantages such as short process, low energy consumption, and low carbon emissions. Scrap steel, as the main raw material for EAF steelmaking, plays a crucial role in reducing energy consumption, improving production efficiency, and reducing carbon emissions, thus becoming one of the core areas of research in EAF steelmaking technology. Currently, scrap steel preheating technology is mainly divided into two types: horizontal preheating and vertical shaft preheating. Vertical shaft furnaces have attracted attention due to their good preheating effect, but they suffer from problems such as incomplete secondary combustion and high equipment failure rates, limiting their further application. Horizontal furnaces, on the other hand, have advantages such as continuous feeding, long service life, and avoidance of high-temperature radiation, but their preheating effect is relatively weak, and their energy-saving effect is not significant. Addressing the shortcomings of existing scrap steel preheating technologies and improving preheating efficiency to achieve energy conservation and emission reduction goals has become an urgent technical problem to be solved. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a scrap steel preheating device to improve preheating efficiency and achieve the goal of energy conservation and emission reduction.

[0004] The above-mentioned objective of this utility model can be achieved by the following technical solution: This utility model provides a scrap steel preheating device, comprising:

[0005] An electric furnace module, the electric furnace module comprising an electric furnace for heating scrap steel;

[0006] An induction heating module, comprising an induction furnace, an induction coil disposed within the induction furnace, and a support structure for supporting the induction furnace, wherein the induction coil is used for primary preheating of scrap steel within the induction furnace;

[0007] A conveying module is disposed between the electric furnace and the induction heating module, and the conveying module is used to convey scrap steel preheated by the induction heating module to the electric furnace;

[0008] A flexible power supply device is electrically connected to the electric furnace module and / or the induction heating module, and the flexible power supply device is used to draw power from the green power grid.

[0009] In a preferred embodiment of the present invention, the support structure includes a furnace frame, and the induction furnace is disposed on the furnace frame and positioned above the conveying module.

[0010] In a preferred embodiment of the present invention, the induction furnace includes an induction furnace body and an induction furnace cover that can be opened and disposed on the induction furnace body, the induction furnace cover being used to seal the feed inlet of the induction furnace body.

[0011] In a preferred embodiment of the present invention, the induction furnace body includes a cylindrical section and a conical section arranged sequentially from top to bottom. The top of the cylindrical section is provided with a feed inlet, and the conical section is provided with a discharge outlet.

[0012] In a preferred embodiment of this utility model, the green power grid includes one or more combinations of photovoltaic power grid, wind power grid, and tidal power grid.

[0013] In a preferred embodiment of the present invention, the flexible power supply device includes a circuit module for electrically connecting the green power grid and a cable for electrically connecting the circuit module and the induction coil.

[0014] In a preferred embodiment of this utility model, the circuit module includes:

[0015] The first filter circuit module has its input terminal used to connect to the power grid. The first filter circuit module is a C-type filter circuit module.

[0016] A high-frequency PWM inverter circuit module, the input of which is connected to the output of the first filter circuit module;

[0017] A transformer, the input terminal of which is connected to the output terminal of the high-frequency PWM inverter circuit;

[0018] A full-wave rectifier circuit module, the input terminal of which is connected to the output terminal of the transformer;

[0019] The input terminal of the power frequency PWM inverter circuit module is connected to the output terminal of the full-wave rectifier circuit module.

[0020] The second filter circuit module has its input terminal connected to the output terminal of the power frequency PWM inverter circuit module. The second filter circuit module is an inverted L-shaped filter circuit module.

[0021] In a preferred embodiment of the present invention, the conveying module includes a horizontal feeding device and a movable feeding trolley. The horizontal feeding device is disposed between the outlet of the induction furnace and the inlet of the electric furnace, and the movable feeding trolley is disposed between the horizontal feeding device and the inlet of the electric furnace. The movable feeding trolley has a vibrating feeding working position for entering the electric furnace and an avoidance working position for exiting the electric furnace.

[0022] In a preferred embodiment of the present invention, the conveying module further includes a flue gas preheating structure disposed on the horizontal feeding device, the flue gas heating structure being used to perform secondary preheating of scrap steel by the flue gas generated by the electric furnace.

[0023] In a preferred embodiment of the present invention, the horizontal feeding device includes a horizontal feeding section, and the flue gas preheating structure includes an anti-escape hood disposed on at least a portion of the horizontal feeding section. The anti-escape hood is used to guide the flue gas to perform secondary preheating of the scrap steel on the horizontal feeding section.

[0024] The technical solution of this utility model has the following significant beneficial effects:

[0025] The scrap steel preheating device described in this invention uses an induction heating module to preheat the scrap steel in the first stage, raising the preheating temperature of the scrap steel before it enters the electric furnace to over 200°C. This improves preheating efficiency, significantly increases the initial temperature of the scrap steel, and thus greatly shortens the electric furnace smelting time, improving overall production efficiency. Specifically, the induction furnace uses induction coils to perform medium-frequency induction heating of the scrap steel. Furthermore, the induction heating module can be electrically connected to a green electricity grid via a flexible power supply device, thereby achieving green electricity supply and optimizing the energy structure. This not only reduces the use of traditional fossil fuels and carbon emissions but also effectively controls energy costs, achieving the goals of energy conservation and emission reduction. The power of the induction heating module can be flexibly adjusted according to the supply of green electricity. When green electricity is abundant, the power can be increased to achieve efficient preheating; when green electricity is insufficient, induction preheating can be suspended, thus making full use of green electricity.

[0026] Furthermore, by setting up a support structure to support the induction furnace and placing the induction furnace and electric furnace modules at opposite ends of the conveying module, the overall volume of the scrap steel preheating device is effectively reduced. Compared to the existing technology that adds a preheating structure between the conveying module and the electric furnace module, this invention not only simplifies the device layout but also significantly improves the space utilization and installation flexibility of the scrap steel preheating device. This allows the scrap steel preheating device to more easily adapt to the installation requirements of different sites, reduces space limitations, and enhances the overall application range and economy of the equipment. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0029] Figure 1 This is a schematic diagram of one embodiment of the scrap steel preheating device of this utility model;

[0030] Figure 2 This is a schematic diagram of the structure of the induction heating module and flexible power supply device described in this utility model;

[0031] Figure 3 This is a schematic diagram of one structure of the circuit module described in this utility model.

[0032] The reference numerals in the above figures are as follows:

[0033] 10. Green power grid;

[0034] 100. Electric furnace module; 110. Electric furnace;

[0035] 200. Induction heating module; 210. Induction furnace; 211. Induction furnace body; 212. Induction furnace cover; 220. Induction coil; 230. Support structure;

[0036] 300. Conveying module; 310. Horizontal feeding device; 320. Movable feeding trolley; 330. Flue gas preheating structure;

[0037] 400. Flexible power supply device; 410. Circuit module; 411. First filter circuit module; 412. High-frequency PWM inverter circuit module; 413. Transformer; 414. Full-wave rectifier circuit module; 415. Power frequency PWM inverter circuit module; 416. Second filter circuit module; 420. Cable. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Please refer to the following: Figure 1 , Figure 2 and Figure 3As shown, an embodiment of this utility model provides a scrap steel preheating device, which includes an electric furnace module 100, an induction heating module 200, a conveying module 300, and a flexible power supply device 400. The electric furnace module 100 includes an electric furnace 110 for heating scrap steel; the induction heating module 200 includes an induction furnace 210, an induction coil 220 disposed within the induction furnace 210, and a support structure 230 for supporting the induction furnace 210. The induction coil 220 is used for primary preheating of the scrap steel within the induction furnace 210; the conveying module 300 is disposed between the electric furnace 110 and the induction heating module 200, and is used to convey the scrap steel preheated by the induction heating module 200 to the electric furnace 110; the flexible power supply device 400 is electrically connected to the induction heating module 200 and / or the electric furnace module 100, and is used to draw power from the green power grid 10.

[0040] Overall, when the scrap steel preheating device is in use, the induction heating module 200 preheats the scrap steel in the first stage, which can raise the preheating temperature of the scrap steel before it enters the electric furnace 110 to above 200°C, thereby improving the preheating efficiency, significantly increasing the initial temperature of the scrap steel, and thus greatly shortening the smelting time of the electric furnace 110 and improving the overall production efficiency.

[0041] Specifically, the induction furnace 210 can perform medium-frequency induction heating on scrap steel by using an induction coil 220. Furthermore, the induction heating module 200 can be electrically connected to the green power grid 10 through a flexible power supply device 400, thereby achieving green power supply and optimizing the energy structure. This not only reduces the use of traditional fossil fuels and carbon emissions, but also effectively controls energy costs and achieves the goal of energy conservation and emission reduction.

[0042] The power of the induction heating module 200 can be flexibly adjusted according to the supply of green electricity grid 10. When green electricity is sufficient, efficient preheating can be achieved by increasing the power; while when green electricity is insufficient, induction preheating can be suspended, thereby making full use of green electricity.

[0043] Furthermore, by setting up a support structure 230 to support the induction furnace 210, and placing the induction furnace 210 and the electric furnace module 100 at opposite ends of the conveying module 300, the overall volume of the scrap steel preheating device is effectively reduced. Compared to the prior art design that adds a preheating structure between the conveying module 300 and the electric furnace module 100, this invention not only simplifies the device layout but also significantly improves the space utilization and installation flexibility of the scrap steel preheating device. This allows the scrap steel preheating device to more easily adapt to the installation requirements of different sites, reduces space limitations, and enhances the overall application range and economy of the equipment.

[0044] In the embodiments of this utility model, designers can adjust the specific configuration of the flexible power supply device 400 according to usage needs, and no specific limitations are imposed here. Preferably, the flexible power supply device 400 is electrically connected to the induction heating module 200. By electrically connecting the flexible power supply device 400 to the induction heating module 200, the induction heating module 200 can make full use of green electricity, achieving energy saving and emission reduction. Meanwhile, the electric furnace 110 is powered by a more stable power grid, ensuring the operational stability and controllability of the electric furnace 110.

[0045] In the embodiments of this utility model, such as Figure 1 and Figure 2 In the embodiment shown, the support structure 230 includes a furnace frame, and the induction furnace 210 is mounted on the furnace frame and positioned above the conveying module 300.

[0046] By setting the induction furnace 210 on the furnace frame and placing it above the conveying module 300, vertical space utilization is achieved, effectively reducing the horizontal footprint of the scrap steel preheating device. This not only further optimizes the overall layout of the scrap steel preheating device but also significantly improves installation flexibility, making it easier to adapt to the space constraints of different sites.

[0047] Furthermore, the use of a furnace frame to support the induction furnace 210 simplifies the structural design, reduces equipment complexity and manufacturing costs, and improves the stability and reliability of the device. In addition, this vertical layout helps reduce heat loss during scrap steel transport, ensuring efficient preheating and thus providing strong support for energy conservation, emission reduction, and improved production efficiency.

[0048] In the embodiments of this utility model, such as Figure 2 In the embodiment shown, the induction furnace 210 includes an induction furnace body 211 and an induction furnace cover 212 that is openably disposed on the induction furnace body 211. The induction furnace cover 212 can be used to seal the feed port of the induction furnace body 211.

[0049] By setting an openable induction furnace cover 212 to seal the feed inlet of the induction furnace body 211, the thermal efficiency and safety of the scrap steel preheating process are effectively improved. During the preheating process, the sealing effect of the induction furnace cover 212 can reduce heat loss and ensure that a stable high-temperature environment is maintained inside the induction furnace body 211, thereby improving the preheating effect of scrap steel and shortening the preheating time.

[0050] Furthermore, the openable induction furnace cover 212 facilitates the loading of scrap steel and the maintenance and cleaning of the equipment, improving operational convenience. In addition, the induction furnace cover 212 can also prevent external impurities from entering the induction furnace body 211, further improving the preheating quality of scrap steel.

[0051] Designers can adjust the specific configuration of the induction furnace cover 212 according to the usage requirements. For example, the induction furnace cover 212 can be hinged to the induction furnace body 211. No specific restrictions are imposed here.

[0052] In an embodiment of this utility model, the induction furnace body 211 includes a cylindrical section and a conical section arranged sequentially from top to bottom. The top of the cylindrical section is provided with a feed inlet, and the conical section is provided with a discharge outlet.

[0053] By setting the induction furnace body 211 into a cylindrical section and a conical section arranged sequentially from top to bottom, the material flow control and heat distribution during the scrap steel preheating process are effectively optimized.

[0054] The feed inlet at the top of the cylindrical section facilitates the even feeding of scrap steel, while the conical section design helps the scrap steel to smoothly gather towards the discharge outlet under gravity, reducing the risk of jamming or blockage, thereby improving conveying efficiency and continuity.

[0055] In the embodiments of this utility model, the designer may adjust the specific type of the green power grid 10 according to the needs of use, and no specific restrictions are made here.

[0056] Preferably, the green power grid 10 includes one or more combinations of a photovoltaic power grid, a wind power grid, and a tidal power grid. In one specific embodiment, the green power grid 10 includes a photovoltaic power grid. In another specific embodiment, the green power grid 10 includes a wind power grid. In still another specific embodiment, the green power grid 10 includes a tidal power grid.

[0057] By using one or more combinations of photovoltaic power grids, wind power grids, and tidal power grids as the green power grid 10, the energy source flexibility and environmental performance of the scrap steel preheating device are effectively improved.

[0058] Furthermore, the multi-energy combination approach can better adapt to the resource conditions of different regions, improving the energy applicability and economic efficiency of the scrap steel preheating device. In addition, the application of Green Power Grid 10 aligns with the trend of green development, providing strong support for the sustainable development of the scrap steel preheating device and further enhancing its market competitiveness.

[0059] In the embodiments of this utility model, such as Figure 2 and Figure 3 In the embodiment shown, the flexible power supply device 400 includes a circuit module 410 for electrically connecting to the green power grid 10, and a cable 420 for electrically connecting the circuit module 410 to the induction coil 220.

[0060] Through the cooperation of circuit module 410 and cable 420, an efficient and stable electrical connection is achieved between the green power grid 10 and the induction coil 220. Cable 420 can adapt to complex installation environments and position adjustment requirements, effectively reducing connection failures caused by equipment vibration or relative displacement, and improving the reliability and safety of the system.

[0061] Furthermore, the circuit module 410, acting as a relay bridge, enables precise control and regulation of the output of the green power grid 10, ensuring a stable power supply to the induction coil 220, thereby improving the efficiency and quality of scrap steel preheating.

[0062] Designers can adjust the specific structure of circuit module 410 according to usage needs; no specific restrictions are imposed here. For example, ... Figure 3 In the embodiment shown, circuit module 410 includes: a first filter circuit module 411, whose input terminal is used to connect to the power grid, and the first filter circuit module 411 is a C-type filter circuit module 410; a high-frequency PWM inverter circuit module 412, whose input terminal is connected to the output terminal of the first filter circuit module 411; a transformer 413, whose input terminal is connected to the output terminal of the high-frequency PWM inverter circuit; a full-wave rectifier circuit module 414, whose input terminal is connected to the output terminal of the transformer 413; a power frequency PWM inverter circuit module 415, whose input terminal is connected to the output terminal of the full-wave rectifier circuit module 414; and a second filter circuit module 416, whose input terminal is connected to the output terminal of the power frequency PWM inverter circuit module 415, and the second filter circuit module 416 is an inverted L-type filter circuit module 410.

[0063] The above-mentioned flexible power supply device 400 can meet the basic requirements for stable combustion of electric furnace 110 and improve the power utilization rate of electric furnace 110. The flexible power supply can maintain the current of electric arc and the power of electric arc entering the furnace constant, thereby improving the power utilization rate. Electric furnace 110 can achieve the effects of reducing power supply time by 10% to 15%, reducing unit power consumption by 5% to 8%, and reducing electrode loss by 10% to 20%.

[0064] Furthermore, the flexible power supply device 400 not only meets the core requirements of stable arc combustion, power quality control on the power supply side, and control and regulation functions of the electric furnace 110, but also adapts to the frequent power surges of the electric furnace 110 and the high reliability requirements of power supply components under high current operating conditions.

[0065] In the embodiments of this utility model, such as Figure 1In the embodiment shown, the conveying module 300 includes a horizontal feeding device 310 and a movable feeding trolley 320. The horizontal feeding device 310 is disposed between the outlet of the induction furnace 210 and the inlet of the electric furnace 110. The movable feeding trolley 320 is disposed between the horizontal feeding device 310 and the inlet of the electric furnace 110. The movable feeding trolley 320 has a vibrating feeding working position for entering the electric furnace 110 and an avoidance working position for exiting the electric furnace 110.

[0066] The horizontal feeding device 310 and the mobile feeding trolley 320 work together to optimize the transfer process of scrap steel from the induction furnace 210 to the electric furnace 110. The horizontal feeding device 310 enables the smooth conveying of scrap steel, while the mobile feeding trolley 320 can switch between the vibrating feeding position and the avoidance position, ensuring the flexibility and safety of the feeding process.

[0067] During feeding, the movable feeding trolley 320 enters the electric furnace 110 to complete precise feeding; when not feeding, the movable feeding trolley 320 exits the electric furnace 110 to avoid interfering with other operations, thereby improving the operating efficiency and reliability of the equipment.

[0068] Furthermore, the conveying module 300 also includes a flue gas preheating structure 330 disposed on the horizontal feeding device 310. The flue gas heating structure is used to perform secondary preheating of scrap steel by the flue gas generated by the electric furnace 110.

[0069] By setting a flue gas preheating structure 330 on the horizontal feeding device 310, the flue gas generated by the electric furnace 110 can be used to preheat the scrap steel in two stages, which effectively improves the energy utilization rate and the scrap steel heating efficiency.

[0070] The flue gas preheating structure 330 fully utilizes the waste heat of the flue gas from the electric furnace 110, reducing heat waste and lowering the demand for external energy, thereby achieving the goal of energy conservation and emission reduction. Furthermore, the secondary preheating process can further increase the temperature of the scrap steel, shorten its heating time in the electric furnace 110, and improve overall production efficiency.

[0071] This invention employs a two-stage preheating mode, namely primary preheating of the induction furnace 210 and secondary preheating of the high-temperature flue gas of the electric furnace 110. Without increasing additional energy consumption, it makes full use of green electricity and waste heat resources of the electric furnace 110, significantly increases the preheating temperature of scrap steel, and further enhances the effect of energy conservation and emission reduction.

[0072] Designers can adjust the specific construction of the flue gas preheating structure 330 according to usage requirements, and no specific limitations are imposed here. In one feasible embodiment, the horizontal feeding device 310 includes a horizontal feeding section, and the flue gas preheating structure 330 includes an escape hood disposed on at least a portion of the horizontal feeding section. The escape hood is used to guide the flue gas to perform secondary preheating of the scrap steel on the horizontal feeding section. The escape hood can be used in conjunction with a dust removal device to remove dust from the flue gas.

[0073] In an embodiment of this utility model, a feasible way of using the scrap steel preheating device includes the following steps: scrap steel is added to the induction furnace 210 for primary preheating by a steel grabber or a disk crane. After preheating for five minutes, it is poured into the horizontal feeding section. The primary preheating temperature can reach about 300°C. The induction furnace 210 is connected to the horizontal feeding device 310, and the scrap steel can enter the horizontal feeding section from the discharge port of the induction furnace 210. After secondary preheating by the high-temperature flue gas of the electric furnace 110 in the horizontal feeding section, the scrap steel is added into the electric furnace 110 by a movable feeding trolley 320. The power supply device of the induction furnace 210 adopts a flexible power supply device 400. The 00 can improve the operational stability and preheating efficiency of the induction furnace 210; the flexible power supply device 400 is powered by green electricity such as photovoltaic, wind power, and tidal power grids, and its working power is set to 21MVA. It can be used to supply heating to the induction furnace 210; the scrap steel after primary preheating enters the horizontal feeding section and is preheated by the high-temperature flue gas generated by the electric furnace 110. After secondary preheating, the average preheating temperature of the scrap steel entering the electric furnace 110 can reach about 600℃; if the production pace of the electric furnace 110 is fast and the induction furnace 210 cannot meet the production pace of the electric furnace 110, some scrap steel can be directly added to the horizontal feeding section for preheating according to the smelting situation.

[0074] This invention can significantly improve the preheating effect of scrap steel, raising the preheating temperature of scrap steel to 600℃ before it enters the electric furnace 110, effectively shortening the smelting time of the electric furnace 110 and improving production efficiency. Furthermore, by adopting electromagnetic induction heating, the power of the medium-frequency induction furnace 210 is provided by green electricity such as photovoltaic power, which greatly reduces energy costs and carbon emissions. In addition, by adopting a flexible power supply device 400, the operational stability and preheating efficiency of the induction furnace 210 are improved, further reducing energy costs and carbon emissions. Moreover, the discharge port of the induction furnace 210 is connected to the horizontal feeding section, reducing heat loss caused by scrap steel transportation.

[0075] This invention employs a two-stage preheating process. After applying green electricity such as photovoltaic power to the induction furnace 210 to preheat the scrap steel, the scrap steel is added to the horizontal feeding section and preheated a second time by the high-temperature flue gas of the electric furnace 110. This two-stage preheating achieves the effect of increasing the preheating temperature of the scrap steel without increasing energy consumption.

[0076] This utility model is flexible in application and can meet the frequency regulation requirements of the power grid. When there is abundant green electricity in the power grid, the power can be increased to utilize green electricity, and when there is a shortage of green electricity in the power grid, induction preheating can be omitted. The preheating device combining induction furnace 210 and horizontal feeding has an adaptive adjustment mechanism to cope with different working conditions (such as changes in the type and quantity of scrap steel), which allows it to flexibly optimize the preheating effect according to the actual situation.

[0077] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0078] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A scrap steel preheating device, characterized in that, include: An electric furnace module, the electric furnace module comprising an electric furnace for heating scrap steel; An induction heating module, comprising an induction furnace, an induction coil disposed within the induction furnace, and a support structure for supporting the induction furnace, wherein the induction coil is used for primary preheating of scrap steel within the induction furnace; A conveying module is disposed between the electric furnace and the induction heating module, and the conveying module is used to convey scrap steel preheated by the induction heating module to the electric furnace; A flexible power supply device is electrically connected to the induction heating module and / or the electric furnace module, and the flexible power supply device is used to draw power from the green power grid.

2. The scrap steel preheating device as described in claim 1, characterized in that, The support structure includes a furnace frame, on which the induction furnace is mounted and positioned above the conveying module.

3. The scrap steel preheating device as described in claim 1, characterized in that, The induction furnace includes an induction furnace body and an induction furnace cover that can be opened and disposed on the induction furnace body. The induction furnace cover can be used to seal the feed port of the induction furnace body.

4. The scrap steel preheating device as described in claim 3, characterized in that, The induction furnace body includes a cylindrical section and a conical section arranged sequentially from top to bottom. The top of the cylindrical section is provided with a feed inlet, and the conical section is provided with a discharge outlet.

5. The scrap steel preheating device as described in claim 1, characterized in that, The green power grid includes one or more combinations of photovoltaic power grids, wind power grids, and tidal power grids.

6. The scrap steel preheating device as described in claim 5, characterized in that, The flexible power supply device includes a circuit module for electrically connecting to the green power grid, and a cable for electrically connecting the circuit module to the induction coil.

7. The scrap steel preheating device as described in claim 6, characterized in that, The circuit module includes: The first filter circuit module has its input terminal used to connect to the power grid. The first filter circuit module is a C-type filter circuit module. A high-frequency PWM inverter circuit module, the input of which is connected to the output of the first filter circuit module; A transformer, the input terminal of which is connected to the output terminal of the high-frequency PWM inverter circuit; A full-wave rectifier circuit module, the input terminal of which is connected to the output terminal of the transformer; The input terminal of the power frequency PWM inverter circuit module is connected to the output terminal of the full-wave rectifier circuit module. The second filter circuit module has its input terminal connected to the output terminal of the power frequency PWM inverter circuit module. The second filter circuit module is an inverted L-shaped filter circuit module.

8. The scrap steel preheating device as described in claim 1, characterized in that, The conveying module includes a horizontal feeding device and a movable feeding trolley. The horizontal feeding device is located between the outlet of the induction furnace and the inlet of the electric furnace. The movable feeding trolley is located between the horizontal feeding device and the inlet of the electric furnace. The movable feeding trolley has a vibrating feeding working position for entering the electric furnace and an obstacle avoidance working position for exiting the electric furnace.

9. The scrap steel preheating device as described in claim 8, characterized in that, The conveying module also includes a flue gas preheating structure disposed on the horizontal feeding device, the flue gas heating structure being used to preheat the scrap steel in a secondary manner using the flue gas generated by the electric furnace.

10. The scrap steel preheating device as described in claim 9, characterized in that, The horizontal feeding device includes a horizontal feeding section, and the flue gas preheating structure includes an anti-escape hood disposed on at least a portion of the horizontal feeding section. The anti-escape hood is used to guide the flue gas to perform secondary preheating of the scrap steel on the horizontal feeding section.

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