A molten steel heating method, device, storage medium and electronic equipment

Abstract

The application belongs to the technical field of continuous casting, and discloses a molten steel heating method, a molten steel heating device, a storage medium and an electronic device. The molten steel heating device comprises a tundish, a long nozzle in communication with the tundish, a support ring sleeved and fixed at the top end of the long nozzle, an induction coil installed in the support ring and arranged on the outer periphery of the outer wall of the long nozzle, a temperature sensor installed on the tundish to measure and feed back the temperature of the molten steel, and a control system electrically connected with the induction coil and the temperature sensor respectively. The control system compares the temperature signal with a preset lower limit value of the pouring temperature, opens the induction coil when the temperature is lower than the lower limit value, and closes the induction coil when the temperature is higher than the lower limit value, so as to accurately and automatically control the temperature of the molten steel in the long nozzle. The induction coil is built-in and hidden in the support ring, external mechanical damage and safety hazards are avoided, and the service life of the system is improved. Meanwhile, through a closed-loop control scheme, defects caused by process abnormalities are reduced, and the structure of the pouring system is simplified.

Description

Technical Field

[0001] This invention relates to a method, apparatus, storage medium, and electronic equipment for heating molten steel, belonging to the field of continuous casting technology. Background Technology

[0002] Low-temperature casting of molten steel (i.e., casting temperature too low) is a common but extremely dangerous process anomaly in continuous casting, severely impacting billet quality, production efficiency, and equipment safety. Therefore, heating devices are typically added to heat the molten steel and ensure casting is completed within a suitable temperature range. Currently, the installation of these heating devices is complex, and their addition complicates the overall structure of the casting system. Furthermore, because these devices are generally exposed, they pose safety hazards and are prone to damage, resulting in a short service life. Summary of the Invention

[0003] The present invention aims to provide a method, apparatus, storage medium and electronic equipment for heating molten steel, to ensure that molten steel is cast within a suitable temperature range, simplify the structure and improve safety and service life.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A steel heating device, comprising: Intermediate package; A long water inlet, which is connected to the intermediate package; A support ring, which is fitted and fixed to the top of the long nozzle; An induction coil is installed inside the support ring and located on the outer periphery of the long water inlet; A temperature sensor, which is installed on the tundish, is used to measure and report the temperature of the molten steel inside the tundish; The control system is electrically connected to the induction coil and the temperature sensor respectively, and is used to receive and process the temperature signal from the temperature sensor. When the temperature value indicated by the temperature signal is lower than the preset casting temperature lower limit, the control system controls the induction coil to be energized for heating.

[0005] Furthermore, the support ring has an annular groove inside, and the side of the support ring has at least one connection hole communicating with the annular groove. The induction coil is installed in the annular groove and its end extends out of the connection hole and is electrically connected to the control system.

[0006] Furthermore, the annular groove is coaxially arranged with the long water inlet, and the induction coil is sleeved on the long water inlet.

[0007] Furthermore, the support ring has a locking hole in the radial direction, and a locking member is provided in the locking hole. The end of the locking member abuts against the outer wall of the long water inlet, or is threadedly connected to a connector fixed on the long water inlet 2, so as to fix the support ring to the long water inlet.

[0008] Furthermore, the support ring is a ring-shaped structure, which is coaxially arranged with the long water inlet.

[0009] Furthermore, the probe of the temperature sensor is disposed inside the protective shell, which is fixed to the intermediate package and extends into the interior of the intermediate package to allow the probe of the temperature sensor to extend into the intermediate package.

[0010] Furthermore, the control system includes a computing unit configured to use a closed-loop control algorithm to generate a control signal for the induction coil based on the deviation between the temperature value indicated by the temperature signal and the preset casting lower limit value.

[0011] Furthermore, the control system also includes a data acquisition unit, an amplification unit, and a control unit. The temperature sensor, data acquisition unit, amplification unit, arithmetic unit, and control unit are electrically connected in sequence. The data acquisition unit is used to acquire temperature signals, the amplification unit is used to amplify temperature signals, and the control unit is electrically connected to the induction coil through a switching element in the drive main circuit, and is used to control the induction coil to be energized and de-energized according to the control signal.

[0012] Furthermore, the molten steel heating device includes a PLC remote cabinet, a PLC main station cabinet, and an industrial control computer that are electrically connected in sequence. The acquisition unit and the amplification unit are both located in the PLC remote cabinet, the calculation unit is located in the PLC main station cabinet, and the control unit is located in the industrial control computer.

[0013] Furthermore, the molten steel heating device also includes a robotic arm with a U-shaped fork structure at its free end. The support ring is located inside the U-shaped fork structure, and the U-shaped fork structure, the support ring, and the long nozzle are fixed in sequence.

[0014] A method for heating molten steel, utilizing the aforementioned molten steel heating device to control the heating of molten steel, includes the following steps: The temperature of the molten steel in the tundish is measured by the temperature sensor to obtain a temperature signal. When the temperature value indicated by the temperature signal is lower than the preset lower limit of the casting temperature, the control system controls the induction coil to be energized in order to heat the molten steel flowing through the long nozzle; When the temperature value indicated by the temperature signal is higher than or equal to the preset lower limit of the casting temperature, the control system controls the induction coil to be de-energized so as to stop heating the molten steel flowing through the long nozzle.

[0015] A computer-readable storage medium storing computer-readable instructions that, when executed by a computer's processor, cause the computer to perform the aforementioned molten steel heating method.

[0016] An electronic device, comprising: One or more processors; A storage device for storing one or more programs that, when executed by one or more processors, enable the electronic device to implement the above-described steel heating method.

[0017] Compared with the prior art, the present invention has the following advantages: 1. This invention achieves intelligent closed-loop control of molten steel heating by installing and fixing a support ring at the top of the long nozzle connected to the tundish, embedding the induction coil within the support ring and placing it around the long nozzle, and connecting it to a temperature sensor mounted on the tundish and a control system. On one hand, by "embedding" the induction coil within the support ring, the complex support structure of traditional external heating devices is eliminated, simplifying the casting system. Furthermore, the support ring provides good physical shielding for the induction coil, preventing physical damage from high-temperature radiation, molten steel splashing, and thermal shock at the continuous casting site, eliminating safety hazards associated with open-air high-voltage operations, and extending the equipment's service life. On the other hand, the control system can automatically determine and control the opening and closing of the induction coil outside the long nozzle based on the real-time molten steel temperature fed back from the temperature sensor, providing timely electromagnetic induction heating compensation for the flowing molten steel. This ensures that the molten steel is poured smoothly within a suitable temperature range, effectively avoiding defects in the cast billet, freezing, or production interruptions caused by low-temperature casting. This achieves a synergistic unity of simplified structure, improved safety, extended service life, and guaranteed casting temperature.

[0018] 2. This invention utilizes an annular groove coaxial with the support ring inside, allowing the bent induction coil to be coaxially and symmetrically fitted around the periphery of the long nozzle. The two ends of the induction coil extend from the connection holes on the side wall of the support ring. This structure is not only compact but also generates a uniform electromagnetic field centered on the axis of the long nozzle, thus providing 360° circumferential uniform induction heating of the molten steel flowing inside the long nozzle without dead angles. This results in high heat conduction efficiency and avoids nozzle cracking caused by uneven thermal stress due to localized overheating.

[0019] 3. This invention provides a locking hole on the radial side of the support ring and uses a locking element to abut against or be threaded onto the outer wall of the long nozzle. This mating structure allows the support ring to be firmly and coaxially clamped and restricted to the required position of the long nozzle. This not only ensures accurate positioning and prevents radial sway, but also simplifies disassembly and assembly. It can meet the needs of frequent online replacement and rapid disassembly and assembly of long nozzles on site, reducing non-production auxiliary time on site.

[0020] 4. This invention places the temperature sensor probe inside a protective shell that is fixed to the tundish and extends inward, creating a physical barrier to isolate the temperature sensor. This ensures that the temperature sensor can sensitively obtain the real-time temperature of the molten steel inside the tundish, while preventing damage to the temperature sensor from high-temperature molten steel erosion, alkaline steel slag corrosion, or sudden changes in thermal stress. This results in long-term stable and accurate temperature measurement feedback, extending the service life of the temperature sensor. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of an embodiment of the present invention; Figure 3 This is a perspective view of one embodiment of the connection between the support ring and the induction coil described in this invention; Figure 4 This is a cross-sectional view of one embodiment of the connection between the support ring and the induction coil described in this invention; Figure 5 This is a perspective view of one embodiment of the temperature sensor and the protective shell of the present invention being connected; Figure 6 This is a cross-sectional view of one embodiment of the temperature sensor and the protective shell of the present invention being connected; Figure 7 This is a block diagram of a control system according to an embodiment of the present invention.

[0022] The serial numbers in the diagram are as follows: 1-Intermediate liner; 2-Long nozzle; 3-Support ring; 4-Induction coil; 5-Temperature sensor; 6-Annular groove; 7-Locking hole; 8-Connecting hole; 9-Protective shell; 91-Shell body; 92-End cover flange; 10-Robot arm; 11-U-shaped fork structure. Detailed Implementation

[0023] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0025] See Figures 1 to 7This embodiment provides a molten steel heating device. The device includes a tundish 1, a long nozzle 2, a support ring 3, an induction coil 4, a temperature sensor 5, a PLC remote control cabinet, a PLC master station cabinet, and an industrial control computer. The long nozzle 2 is connected to the tundish 1 and is used to inject molten steel into the tundish 1. The support ring 3 is fitted and fixed to the top of the long nozzle 2, i.e., the end of the long nozzle 2 where molten steel enters. The induction coil 4 is installed inside the support ring 3 and located on the outer periphery of the long nozzle 2, used to heat the molten steel flowing through the long nozzle 2. The temperature sensor 5 is a thermocouple, installed on the tundish 1, used to measure and provide feedback on the temperature of the molten steel in the tundish 1 in real time. The PLC remote control cabinet, the PLC master station cabinet, and the industrial control computer are electrically connected in sequence, and each integrates a control system. The control system is electrically connected to the induction coil 4 and the temperature sensor 5, respectively, to receive and process the temperature signal from the temperature sensor 5. When the temperature value indicated by the temperature signal is lower than a preset casting temperature lower limit, the control system energizes the induction coil 4 for heating.

[0026] See Figures 1 to 4 The long sprue 2 has a cylindrical structure. The support ring 3 is adapted to the structure of the long sprue 2. The support ring 3 has a ring-shaped structure and is also cylindrical in shape. Its structure is simple and easy to manufacture. The support ring 3 and the long sprue 2 are coaxially arranged. The axial length of the support ring 3 is less than the axial length of the long sprue 2. A locking hole 7 is radially formed on the periphery of the support ring 3. A locking element is inserted into the locking hole 7. The end of the locking element abuts against the outer wall of the long sprue 2 or is threadedly connected to a metal connector fixed on the long sprue 2, thereby pressing or thread-locking the support ring 3 and the long sprue 2 together. The locking hole 7 can be a smooth hole or a threaded hole, and the locking element can be a pin or a bolt-like fastener. The design of fixing the support ring 3 and the long sprue 2 with the locking hole 7 and the locking element facilitates the disassembly or installation of the support ring 3 and the long sprue 2.

[0027] See Figures 1 to 4 The support ring 3 has an annular groove 6 inside, which is coaxially arranged with the long nozzle 2. Two connecting holes 8 are radially opened on the side of the support ring 3, communicating with the annular groove 6. The two connecting holes 8 are on the same horizontal plane and parallel, located on the same side and with identical structure. Both connecting holes 8 are circular holes. The induction coil 4 is bent into a ring and installed inside the annular groove 6, that is, the induction coil 4 is sleeved on the long nozzle 2. Both ends of the induction coil 4 extend out of the support ring 3 from the connecting holes 8 and are electrically connected to the control system. By embedding the induction coil 4 inside the support ring 3, exposed installation is avoided, physical damage is prevented, its service life is extended, and operational safety is improved. At the same time, by placing the support ring 3 at the top of the long nozzle 2 (the molten steel inlet end), that is, placing the induction coil 4 at the top of the long nozzle 2, it can better and more closely approach the molten steel for heating, improving thermal efficiency.

[0028] See Figure 1 , Figure 5 and Figure 6 Temperature sensor 5 is installed in the tundish 1 near its internal stopper rod, using an embedded installation method. Specifically, the probe of temperature sensor 5 is located inside the protective shell 9. The protective shell 9 includes a shell body 91 and an end cap flange 92 coaxially fixed to the shell body 91. The shell body 91 is cylindrical with an internal cavity. The end cap flange 92 is disc-shaped, integrally formed or welded to the open end of the shell body 91 to close the shell body 91, and its diameter is larger than that of the shell body 91. The end cap flange 92 has a mounting hole at its center that communicates with the internal cavity of the shell body 91, and multiple circumferentially distributed fixing holes at its surrounding edges. When the protective shell 9 is installed, the shell body 91 is located inside the tundish 1, and the end cap flange 92 is fitted against the outer wall of the tundish 1. Multiple bolts are inserted into the fixing holes to fix the end cap flange 92 to the tundish 1, that is, to fix the protective shell 9 to the tundish 1. The probe of temperature sensor 5 is inserted into the cavity of housing 91 through the mounting hole, so that the probe of temperature sensor 5 can extend into tundish 1. In this way, it is convenient for temperature sensor 5 to measure the temperature of molten steel in tundish 1, and it is also convenient to protect temperature sensor 5 from direct contact with molten steel and thermal damage.

[0029] In some embodiments, the long nozzle 2 can be fixed to the tundish 1 at the middle position by a flange and bolts, or fixed to the tundish 1 by a socket structure and sealed with refractory material. See also [link to relevant documentation] in this embodiment. Figure 1 and Figure 2 The long nozzle 2 is movable and fixedly mounted on the robot arm 10, which drives the long nozzle 2 to extend into the tundish 1. The robot arm 10 is fixed to the top of the long nozzle 2 via a U-shaped fork structure 11. The robot arm 10 drives the long nozzle 2 to rise, fall, and move horizontally, thereby pouring molten steel into different positions inside the tundish 1, making operation simpler. To simplify the structure and facilitate disassembly and assembly, the design of the locking hole 7 and locking element on the original support ring 3 can be utilized. That is, fastening holes are set at both ends of the U-shaped fork structure 11 in the radial direction, and the fastening holes are aligned coaxially with the locking holes 7. Then, the locking element is inserted into the fastening holes and locking holes 7 in sequence, and the end of the locking element abuts against the outer wall of the long nozzle 2 or is threadedly connected to the long nozzle 2, thereby fixing the U-shaped fork structure 11, the support ring 3, and the long nozzle 2, that is, fixing the robot arm 10, the support ring 3, and the long nozzle 2.

[0030] In this embodiment, the control system includes a data acquisition unit, an amplification unit, a computation unit, and a control unit, which are electrically connected in sequence. The data acquisition unit and the amplification unit are both located in the PLC remote cabinet. The data acquisition unit is electrically connected to the temperature sensor 5 to acquire temperature signals, and the amplification unit amplifies the temperature signals. The computation unit is located in the PLC main station cabinet. The computation unit compares the temperature signal value with a preset lower limit for casting temperature and feeds the comparison result back to the control unit. That is, the computation unit is configured to use a closed-loop control algorithm, generating a control signal for the induction coil 4 based on the deviation between the temperature value indicated by the temperature signal and the preset lower limit for casting temperature. The control unit is located in the industrial computer. The control unit is electrically connected to the induction coil 4 through a switching element in the main drive circuit, and is used to control the energized and de-energized states of the induction coil 4. There are two PLC remote cabinets, electrically connected to the induction coil 4 and the temperature sensor 5 respectively, for signal transmission control. The PLC main station cabinet is used for logical operations and judgments. The industrial control computer is used to transmit overall control commands, display and monitor the molten steel temperature value processed by software, and issue an alarm when the temperature is lower than the lower limit of the casting temperature for the corresponding steel grade, providing audible alarms and visual prompts to the operators.

[0031] The principle of the molten steel heating device is as follows: Thermocouples are used to detect the temperature change trend of the molten steel in the tundish 1. The thermocouples collect temperature signals and transmit them to the PLC remote cabinet. The PLC remote cabinet collects, amplifies, and transmits the signals to the PLC main station cabinet. The PLC main station cabinet transmits the signals to the industrial control computer. The industrial control computer, through its internal model software algorithm, determines when the real-time molten steel temperature is lower than the lower limit of the casting temperature, triggers an alarm, and sends the alarm signal to the PLC main station cabinet and the entire continuous casting system. Simultaneously, induction coil 4 is activated, i.e., the control system triggers induction coil 4 to energize it, thus induction heating the molten steel flowing through the long nozzle 2. Then, the thermocouples continue to detect the temperature change trend of the molten steel in the tundish 1, repeating the above steps until the industrial control computer, through its internal model software algorithm, determines that the real-time molten steel temperature is higher than the lower limit of the casting temperature. At this point, the alarm is deactivated, and the signal is sent to the PLC main station cabinet and the entire continuous casting system. Simultaneously, induction coil 4 is de-energized to stop heating. This process is repeated continuously.

[0032] This embodiment also provides a method for heating molten steel. This method utilizes the aforementioned molten steel heating device to control the heating of molten steel, and includes the following steps: Step 1: Continuously measure and report the real-time temperature of the molten steel in the tundish 1 using temperature sensor 5; Step 2: The control system receives and amplifies the temperature signal from temperature sensor 5, and compares the temperature value indicated by the temperature signal with the preset lower limit of the casting temperature. Step 3: When the temperature value is lower than the preset lower limit of the casting temperature, the control system controls the induction coil 4 to be energized to heat the molten steel in the long nozzle 2; when the temperature value is higher than or equal to the preset lower limit of the casting temperature, the control system controls the induction coil 4 to be de-energized to stop heating.

[0033] The specific operations in steps two and three above are as follows: the temperature signal from the temperature sensor 5 is acquired by the acquisition unit in the control system, the temperature signal acquired by the acquisition unit is amplified by the amplification unit, and the temperature value indicated by the temperature signal is compared with the preset lower limit of the casting temperature by the calculation unit, and the comparison result is fed back to the control unit; when the temperature value is lower than the preset lower limit of the casting temperature, the control unit controls the induction coil 4 to be energized to heat the molten steel in the long nozzle 2; when the temperature value is higher than or equal to the preset lower limit of the casting temperature, the control unit controls the induction coil 4 to be de-energized to stop heating.

[0034] This embodiment also provides a computer-readable storage medium. The computer-readable storage medium stores computer-readable instructions, which, when executed by a computer's processor, cause the computer to perform the aforementioned molten steel heating method.

[0035] This embodiment also provides an electronic device. The electronic device includes one or more processors and a storage device. The storage device stores one or more programs, which, when executed by the one or more processors, cause the electronic device to implement the aforementioned molten steel heating method.

[0036] The embodiments of the present invention have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention is not limited to the specific embodiments described above; these embodiments are merely illustrative and not limiting. Those skilled in the art, under the guidance of the present invention, can make many modifications without departing from the spirit and scope of the claims, and all such modifications fall within the scope of protection of the present invention.

Claims

1. A steel heating device, characterized in that, include: Intermediate package (1); The long water inlet (2) is connected to the intermediate package (1); Support ring (3), which is fitted and fixed at the top of the long water inlet (2); An induction coil (4) is installed inside the support ring (3) and located on the outer periphery of the long water inlet (2); A temperature sensor (5) is installed on the tundish (1) to measure and provide feedback on the temperature of the molten steel inside the tundish (1); The control system is electrically connected to the induction coil (4) and the temperature sensor (5) respectively, and is used to receive and process the temperature signal from the temperature sensor (5). When the temperature value indicated by the temperature signal is lower than the preset casting temperature lower limit, the control system controls the induction coil (4) to be energized and heated.

2. The steel heating device according to claim 1, characterized in that, The support ring (3) has an annular groove (6) inside, and the support ring (3) has at least one connecting hole (8) communicating with the annular groove (6) on its side. The induction coil (4) is installed in the annular groove (6) and its end extends out of the connecting hole (8) and is electrically connected to the control system.

3. The steel heating device according to claim 2, characterized in that, The annular groove (6) is coaxially arranged with the long water inlet (2), and the induction coil (4) is sleeved on the long water inlet (2).

4. The steel heating device according to claim 1, characterized in that, The support ring (3) has a locking hole (7) in the radial direction. A locking member is provided in the locking hole (7). The end of the locking member abuts against the outer wall of the long water outlet (2) or is threadedly connected to the connector fixed on the long water outlet (2) to fix the support ring (3) to the long water outlet (2).

5. The steel heating device according to claim 1, characterized in that, The support ring (3) is a ring structure and is coaxially arranged with the long water inlet (2).

6. The steel heating device according to claim 1, characterized in that, The probe of the temperature sensor (5) is located inside the protective shell (9). The protective shell (9) is fixed on the intermediate package (1) and extends into the interior of the intermediate package (1) to allow the probe of the temperature sensor (5) to be inserted into the intermediate package (1).

7. The steel heating device according to claim 1, characterized in that, The control system includes a computing unit configured to use a closed-loop control algorithm to generate a control signal for the induction coil (4) based on the deviation between the temperature value indicated by the temperature signal and the preset casting lower limit value.

8. A method for heating molten steel, characterized in that, The heating control of molten steel using the steel heating device as described in any one of claims 1 to 7 includes the following steps: The temperature of the molten steel in the tundish (1) is measured by the temperature sensor (5) to obtain a temperature signal; When the temperature value indicated by the temperature signal is lower than the preset lower limit of the casting temperature, the induction coil (4) is energized by the control system to heat the molten steel flowing through the long nozzle (2); When the temperature value indicated by the temperature signal is higher than or equal to the preset lower limit of the casting temperature, the induction coil (4) is de-energized by the control system to stop heating the molten steel flowing through the long nozzle (2).

9. A computer-readable storage medium, characterized in that, It stores computer-readable instructions that, when executed by the computer's processor, cause the computer to perform the steel heating method as described in claim 8.

10. An electronic device, characterized in that, include: One or more processors; A storage device for storing one or more programs that, when executed by one or more processors, cause the electronic device to implement the steel heating method as described in claim 8.

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