Electromagnetic induction heating system for continuous casting bale long nozzle

Abstract

The invention relates to the technical field of heating of continuous casting large ladle long nozzles, in particular to a continuous casting large ladle long nozzle electromagnetic induction heating system which comprises an electromagnetic induction heating device. The electromagnetic induction coil assembly is arranged outside the large-ladle long nozzle and is coaxial with the large-ladle long nozzle, the large-ladle long nozzle is provided with a contraction section and a transfer section, and the end, away from the contraction section, of the transfer section is a lower nozzle. The electromagnetic induction coil assembly extends from the joint of the contraction section and the transfer section to the position of the water outlet, and the extension length of the electromagnetic induction coil assembly is two thirds to three quarters of the length of the transfer section. The method has the advantages that energy consumption is reduced, accurate control over the molten steel temperature is achieved, and the continuous casting production efficiency and the casting blank quality are improved.

Description

Technical Field

[0001] The present application relates to the technical field of heating long shrouds for continuous casting ladle, and in particular to an electromagnetic induction heating system for long shrouds for continuous casting ladle. Background Art

[0002] As an efficient continuous casting method, continuous casting technology plays an important role in the steel industry. In the continuous casting process, accurate control of molten steel temperature is crucial. Temperature control not only affects the solidification rate, microstructure and mechanical properties of the ingot, but is also directly related to the production efficiency and product qualification rate of the continuous casting machine.

[0003] At present, the commonly used heating methods mainly include flame heating, resistance heating, tundish plasma heating, tundish electromagnetic heating and other methods. These heating methods have their own characteristics and have been widely used in actual production. Flame heating is usually suitable for heating operations in a smaller range; resistance heating relies on the heat generated by the current passing through the heating element for heating; and tundish plasma heating and electromagnetic heating are mainly used for heating in the continuous casting process. However, the above heating methods all have some shortcomings, especially the difficulty in achieving precise control of the molten steel temperature. Traditional flame heating and resistance heating methods are prone to high energy consumption and low heating efficiency during the heating process; and although tundish plasma heating and electromagnetic heating can partially improve these problems, they still face defects such as insufficient temperature control and high energy consumption in actual applications. Summary of the invention

[0004] In order to reduce energy consumption, the present application provides an electromagnetic induction heating system for a long nozzle of a continuous casting ladle.

[0005] The electromagnetic induction heating system for the long nozzle of a continuous casting ladle provided in this application adopts the following technical solution: An electromagnetic induction heating system for a long shroud of a continuous casting ladle comprises an electromagnetic induction heating device, wherein the electromagnetic induction heating device comprises an electromagnetic induction coil group, wherein the electromagnetic induction coil group is arranged outside the long shroud of the ladle and coaxially with the long shroud of the ladle, the long shroud of the ladle comprises a contraction section and a transfer section, wherein one end of the transfer section away from the contraction section is a water outlet, the electromagnetic induction coil group extends from the connection between the contraction section and the transfer section to the position of the water outlet, and the extension length of the electromagnetic induction coil group is two-thirds to three-quarters of the length of the transfer section.

[0006] By adopting the above technical solution, the electromagnetic induction coil group is arranged outside the ladle long shroud and coaxially arranged with the ladle long shroud, and extends from the connection between the contraction section and the transfer section to the position of the lower shroud, and the extension length is two-thirds to three-quarters of the length of the transfer section, thereby forming a heating zone occupying two-thirds to three-quarters of the length of the transfer section. In the heating zone, the molten steel can be heated by electromagnetic induction technology, and the electromagnetic induction coil requires less electricity, which can achieve uniform temperature heating during the continuous casting production process, improve the quality of the ingot and the continuous casting production efficiency, and reduce energy consumption and production costs.

[0007] Optionally, the electromagnetic induction coil group includes a plurality of induction coils, the induction coils are arranged at equal intervals and each of the induction coils has the same parameters.

[0008] By adopting the above technical solution, the electromagnetic induction coil group is composed of multiple induction coils with equal spacing and the same parameters, which ensures uniform heating of the molten steel in the entire heating area, avoids local overheating or uneven heating, and thus improves the continuous casting production efficiency and the quality of the ingot.

[0009] Optionally, the electromagnetic induction heating device further comprises a current controller, which is disposed on a large ladle water outlet robotic arm, and the induction coil is electrically connected to the current controller.

[0010] By adopting the above technical solution, the current controller can generate alternating current, so that a magnetic field with a constantly changing direction is generated in the induction coil. At this time, the molten steel passing through the heating zone generates eddy current under the excitation of the changing magnetic field, and then the electrical energy is converted into thermal energy, ultimately achieving the purpose of heating the molten steel.

[0011] Optionally, the induction coil is covered with a heat-resistant fiber cover.

[0012] By adopting the above technical solution, the heat-resistant fiber sleeve can effectively prevent heat loss in the heating area and improve the heating efficiency, while protecting the induction coil from high temperature damage and enhancing the durability and safety of the system.

[0013] Optionally, the induction coil is detachably connected to the large ladle sprue robot arm via a mounting frame, and the mounting frame is made of a flexible heat-resistant material.

[0014] By adopting the above technical solution, a detachable connection between the induction coil and the large ladle nozzle robot arm is achieved, making the system more convenient and efficient during installation and maintenance. The use of flexible heat-resistant materials not only enhances the durability of the mounting frame and its ability to adapt to high temperature environments, but also ensures the stability and reliability of the system when the robot arm moves.

[0015] Optionally, the mounting frame includes a first connecting rod, a mechanical arm bayonet and a coil bayonet, the mechanical arm bayonet is arranged at one end of the connecting rod, the number of the coil bayonet is the same as the number of the induction coils, the coil bayonet is connected to the first connecting rod via a second connecting rod perpendicular to the first connecting rod, the mechanical arm bayonet is provided with a locking hole for passing a fastening bolt, and the coil bayonet is used to be clamped with the induction coil sleeved with the heat-resistant fiber sleeve.

[0016] By adopting the above technical solution, the precise docking and quick disassembly between the induction coil and the large ladle water outlet robot arm are achieved, which improves the operational flexibility of the system. The design of the locking hole ensures the stability of the connection between the robot arm bayonet and the large ladle water outlet robot arm, thereby maintaining the stable position of the induction coil during the heating process, avoiding displacement caused by vibration or thermal expansion, and ensuring the consistency and reliability of the heating effect.

[0017] Optionally, the electromagnetic induction heating device also includes a temperature measuring probe and a control component, the number of the temperature measuring probes is the same as the number of the induction coils, the temperature measuring probes are connected to the coil bayonet via a connector, and the control component is simultaneously connected to the temperature measuring probe and the current controller signal.

[0018] By adopting the above technical solution, real-time monitoring and precise control of the heating process are achieved. The temperature probe can monitor the temperature of the heating zone in real time to ensure the uniformity and stability of the heating temperature. The control component automatically adjusts the output of the current controller based on the temperature information provided by the temperature probe, thereby adjusting the power and duty cycle of the electromagnetic induction coil to maintain the set temperature range, thereby ensuring the continuity of the heating process and the consistency of product quality.

[0019] Optionally, the parameters of the induction coil are: diameter 20 mm, 10 turns, and axial length 200 mm.

[0020] By adopting the above technical scheme, the specific parameter setting of the induction coil in the electromagnetic induction heating system of the long shroud of the continuous casting ladle is realized, thereby ensuring that the induction coil generates sufficient magnetic field strength, thereby achieving effective heating of the molten steel and ensuring the uniformity and efficiency of the heating.

[0021] In summary, the present application includes at least one of the following beneficial technical effects: 1. The heating efficiency is improved and the energy consumption is reduced, so that the power consumption per ton of steel is reduced to 3.29 kWh, and the cost increase is controlled within 2.10 yuan / ton of steel; 2. It realizes precise control of molten steel temperature, improving continuous casting production efficiency and ingot quality; 3. The system is easy to install and intuitive to operate, suitable for continuous casting production lines of various sizes, extending service life and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a long-nozzle electromagnetic induction heating system for a continuous casting ladle provided in an embodiment of the present application; Figure 2 It is a schematic diagram of the structure of the mounting frame provided in the embodiment of the present application.

[0023] Explanation of the reference numerals: 1-long water outlet of large bag; 101-contraction section; 102-transfer section; 2-mechanical arm of large water outlet; 3-induction coil; 4-current controller; 5-mounting frame; 501-first connecting rod; 502-second connecting rod; 503-mechanical arm bayonet; 504-coil bayonet; 505-locking hole; 6-temperature measuring probe; 7-connecting piece. DETAILED DESCRIPTION

[0024] The following is combined with Figure 1-2 This application is described in further detail.

[0025] During the continuous casting process, the ladle and the tundish are connected by a shroud, which has a contraction section 101 and a transfer section 102 to protect the molten steel from secondary oxidation and prevent the steel flow from splashing. The shroud is installed below the ladle through the ladle shroud mechanical arm 2. It is an Al2O3-C cylindrical channel for the molten steel to be injected from the ladle to the tundish, and plays a role in guiding and preventing the molten steel from oxidation and splashing. The shroud is an important functional refractory material for realizing molten steel protection casting to improve the quality of the steel billet. Its use will directly affect whether the entire continuous casting process can proceed normally. However, during the steel casting process, when the hot molten steel flows through the shroud, it will lose some heat inside it, resulting in a decrease in temperature. The temperature not only affects the solidification rate, organizational structure and mechanical properties of the ingot, but is also directly related to the production efficiency and product qualification rate of the continuous casting machine. To this end, the present application mainly adopts the following heating system based on the principle of electromagnetic induction, that is, precise control of the molten steel temperature is achieved through precise control of the electromagnetic induction coil 3, thereby achieving the effect of improving the continuous casting production efficiency and the quality of the ingot. The present application is further described in detail below.

[0026] The embodiment of the present application discloses an electromagnetic induction heating system for a long shroud 1 of a continuous casting ladle.

[0027] like Figure 1As shown, the electromagnetic induction heating system of the long shroud 1 of the continuous casting ladle includes an electromagnetic induction heating device, which includes 3 groups of electromagnetic induction coils. The 3 groups of electromagnetic induction coils are arranged outside the long shroud 1 of the ladle and coaxially arranged with the long shroud 1 of the ladle. The end of the transfer section 102 of the long shroud 1 away from the contraction section 101 is the downspout. The 3 groups of electromagnetic induction coils extend from the connection between the contraction section 101 and the transfer section 102 to the position of the downspout. The extension length of the 3 groups of electromagnetic induction coils is two-thirds to three-quarters of the length of the transfer section 102. The ladle shroud mechanical arm 2 is connected to the bottom of the transfer section 102. Using the 3 groups of electromagnetic induction coils, a heating zone can be constructed, and its length occupies two-thirds to three-quarters of the transfer section 102. In this heating zone, electromagnetic induction technology is effectively used to heat molten steel. It is worth noting that this technology has a low demand for electricity, thereby realizing uniform temperature control during the continuous casting production process, significantly improving the quality of the ingot and the efficiency of the continuous casting operation. In addition, the implementation of this technology can also help reduce energy consumption and production costs.

[0028] In order to achieve uniform heating of the molten steel, the electromagnetic induction heating device includes a plurality of induction coils 3. In the present embodiment, the induction coil 3 can be made of copper material with a diameter of 20 mm, each induction coil 3 is wound 10 times, and the axial length is 200 mm. This design ensures sufficient magnetic field strength to heat the molten steel and avoids ineffective energy loss. In addition, the design of axial length of 200 mm ensures that each induction coil 3 has sufficient length to ensure uniform magnetic field distribution, thereby achieving uniform heating of the molten steel. In some other embodiments, the induction coil 3 can be replaced with an induction coil 3 wound 12 times and with an axial length of 220 mm to meet the heating requirements under different working conditions.

[0029] The multiple induction coils 3 are arranged at equal intervals during the setting, and the parameters of each induction coil 3 are the same. This setting can not only make the magnetic field strength at each induction coil 3 constant, but also ensure that each area is heated evenly, and can better control the temperature of the molten steel to adapt to the long shrouds 1 of large ladles of different sizes.

[0030] like Figure 1As shown, specifically, the electromagnetic induction heating device also includes a current controller 4, which is arranged on the large ladle water outlet mechanical arm 2. The current controller 4 can adopt a high-voltage solid-state current controller 4 or a low-voltage transistor current controller 4. The current controller 4 can generate an alternating current, so that a magnetic field with a constantly changing direction is generated in the induction coil 3. At this time, the molten steel passing through the heating zone generates an eddy current under the excitation of the changing magnetic field, and then the electric energy is converted into thermal energy, which finally achieves the purpose of heating the molten steel. The current controller 4 is connected to the induction coil 3 by a wire, and the wire is usually made of high-temperature refractory wire. The high-temperature refractory wire is suitable for high-temperature environments and can withstand high temperatures without damage. By adjusting the power and duty cycle of the induction coil 3 by the current controller 4, the temperature of the molten steel can be accurately controlled.

[0031] like Figure 1 As shown, in order to protect the induction coil 3, a heat-resistant fiber sleeve can be sleeved on the induction coil 3. The heat-resistant fiber sleeve is made of high-temperature resistant materials (such as graphite fiber, silicon carbide fiber, etc.). On the one hand, it can effectively reduce the temperature impact of the external environment on the induction coil 3. On the other hand, since the induction coil 3 is coaxially arranged with the long nozzle, that is, it surrounds the long nozzle, the heat-resistant fiber sleeve sleeved on the induction coil 3 is also around the long nozzle, which can play a role in heat preservation, effectively prevent the heat loss in the heating area, and improve the heating efficiency.

[0032] like Figure 1 and Figure 2 As shown, the induction coil 3 is detachably connected to the large ladle water outlet mechanical arm 2 through the mounting frame 5. The mounting frame 5 is made of flexible heat-resistant material, which means that the material of the mounting frame 5 can be selected from high-temperature resistant silicone rubber or high-temperature nylon material. These two materials have good flexibility and high-temperature resistance and can adapt to the high-temperature environment in the continuous casting process. The mounting frame 5 includes a first connecting rod 501, a mechanical arm bayonet 503 and a coil bayonet 504. The mechanical arm bayonet 503 is arranged at one end of the first connecting rod 501, and the number of coil bayonet 504 is the same as the number of induction coils 3. The mechanical arm bayonet 503 is provided with a locking hole 505 for passing a fastening bolt at a position away from the first connecting rod 501, and the coil bayonet 504 is used to be clamped with the induction coil 3 with a heat-resistant fiber sleeve. Through the second connecting rod 502 perpendicular to the first connecting rod 501, the coil bayonet 504 can achieve efficient connection. This structural design is not only convenient for installation and disassembly, but also can adapt to the flexible movement of the mechanical arm. The mounting frame 5 is fixed by fastening bolts through the locking hole 505 to ensure the stability of the system.

[0033] In addition, in order to improve the automation of the system, the electromagnetic induction heating device also includes a temperature probe 6 and a control component. The number of the temperature probes 6 is the same as the number of the induction coils 3. The thermocouples or infrared temperature probes 6 are used. These temperature probes 6 can monitor the temperature changes in the electromagnetic induction coil in real time and transmit the temperature signal to the control component. The thermocouple has high precision and stability, and the infrared temperature probe 6 can work stably for a long time. The temperature probe 6 is connected to the coil bayonet 504 through a connector 7, and the connector 7 can choose a metal clip or a rubber fixing. Such a connection method ensures the reliable fixation of the temperature probe 6, and the power and duty cycle of the induction coil 3 can be accurately adjusted by detecting the transmitted data, so as to achieve accurate control of the temperature. The control component is simultaneously connected to the temperature probe 6 and the current controller 4 signals. Through the control module in the control component, according to the real-time data of the temperature probe 6, the power and duty cycle of the electromagnetic induction coil 3 are automatically adjusted to meet the demand for the temperature of the molten steel during the continuous casting process. The control module in the control component can be implemented by different control algorithms, such as PID control, fuzzy control, etc. These control algorithms can dynamically adjust the heating power according to temperature changes, making the heating process more flexible and efficient. For example, PID control can quickly stabilize the temperature by adjusting the three parameters of proportion, integration and differentiation; fuzzy control can adapt to more complex temperature changes through fuzzy logic. In addition, the control system can also autonomously optimize the adjustment strategy through learning algorithms, making the entire heating process more intelligent. The temperature probe 6 and the control component have real-time monitoring functions and can adjust the heating power according to real-time data, thereby ensuring that the molten steel temperature is controllable and improving the continuous casting production efficiency.

[0034] The implementation principle of this embodiment is: uniform heating of molten steel is achieved by evenly distributing the electromagnetic induction coils 3. The temperature change is monitored in real time by the temperature measuring probe 6, and the data is transmitted to the control component. The control component automatically adjusts the power and duty cycle of the electromagnetic induction coil 3 through the current controller 4 according to the real-time temperature data, thereby achieving precise temperature control. In addition, the design of the heat-resistant fiber sleeve and the flexible mounting frame 5 improves the safety and durability of the system, so that the entire system not only has high heating efficiency and low energy consumption, but also is easy to install and intuitive to operate. Its significant advantage is that it improves the continuous casting production efficiency and the quality of the ingot, and reduces the production cost and energy consumption. Therefore, the present invention has a significant promoting effect on improving the continuous casting production efficiency and reducing costs, and has important practical application value.

[0035] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0036] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0037] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An electromagnetic induction heating system for a long shroud (1) of a continuous casting ladle, characterized in that: include: An electromagnetic induction heating device, the electromagnetic induction heating device comprising an electromagnetic induction coil (3) group, the electromagnetic induction coil (3) group being arranged outside a large ladle long shroud (1) and being coaxially arranged with the large ladle long shroud (1), the large ladle long shroud (1) comprising a contraction section (101) and a transfer section (102), the end of the transfer section (102) away from the contraction section (101) being a water outlet, the electromagnetic induction coil (3) group extending from the connection between the contraction section (101) and the transfer section (102) towards the position of the water outlet, the extension length of the electromagnetic induction coil (3) group being two-thirds to three-quarters of the length of the transfer section (102).

2. The electromagnetic induction heating system for the long shroud (1) of a continuous casting ladle according to claim 1, characterized in that: The electromagnetic induction coil (3) group comprises a plurality of induction coils (3), the induction coils (3) are arranged at equal intervals and each of the induction coils (3) has the same parameters.

3. The electromagnetic induction heating system for the long shroud (1) of a continuous casting ladle according to claim 2, characterized in that: The electromagnetic induction heating device also includes a current controller (4), which is arranged on the large ladle water outlet mechanical arm (2), and the induction coil (3) is electrically connected to the current controller (4).

4. The electromagnetic induction heating system for the long shroud (1) of a continuous casting ladle according to claim 3, characterized in that: The induction coil (3) is sheathed with a heat-resistant fiber sheath.

5. The electromagnetic induction heating system for the long shroud (1) of a continuous casting ladle according to claim 4, characterized in that: The induction coil (3) is detachably connected to the large sprue outlet mechanical arm (2) via a mounting frame (5), and the mounting frame (5) is made of a flexible heat-resistant material.

6. The electromagnetic induction heating system for the long shroud (1) of a continuous casting ladle according to claim 5, characterized in that: The mounting frame (5) comprises a first connecting rod (501), a mechanical arm bayonet (503) and a coil bayonet (504); the mechanical arm bayonet (503) is arranged at one end of the connecting rod; the number of the coil bayonet (504) is the same as the number of the induction coils (3); the coil bayonet (504) is connected to the first connecting rod (501) via a second connecting rod (502) perpendicular to the first connecting rod (501); a locking hole (505) for passing a fastening bolt is arranged at the mechanical arm bayonet (503); and the coil bayonet (504) is used to be clamped with the induction coil (3) sleeved with the heat-resistant fiber sleeve.

7. The electromagnetic induction heating system for the long shroud (1) of a continuous casting ladle according to claim 6, characterized in that: The electromagnetic induction heating device further comprises a temperature measuring probe (6) and a control component. The number of the temperature measuring probes (6) is the same as the number of the induction coils (3). The temperature measuring probe (6) is connected to the coil bayonet (504) via a connector (7). The control component is simultaneously connected to the temperature measuring probe (6) and the current controller (4) by signal.

8. The electromagnetic induction heating system for the long shroud (1) of a continuous casting ladle according to claim 2, characterized in that: The parameters of the induction coil (3) are: diameter 20 mm, 10 turns, and axial length 200 mm.

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