Gas flow system and ladle furnace

Abstract

This application provides a gas diversion system and a ladle furnace, relating to the field of continuous casting production technology. The gas diversion system provided in this application includes: a gas mixing device for mixing inert gas and reducing gas to output a mixed gas; a jetting device connected to the gas mixing device for injecting the mixed gas into the ladle furnace to be cast, the jetting device including multiple concentrically arranged jetting zones, each jetting zone including multiple nozzles spaced around a center; and a control unit for controlling the gas flow rate of the multiple jetting zones, wherein the gas flow rate of the multiple jetting zones decreases sequentially from the inside out, and the gas flow rate of each jetting zone includes the sum of the gas flow rates of the multiple nozzles located within the jetting zone. This application uses multiple concentrically arranged jetting zones with sequentially decreasing gas flow rates, each jetting zone playing a different role during the casting process, thereby improving the ability of the mixed gas to break up the solidified shell and the diversion stability.

Description

Technical Field

[0001] This application relates to the field of continuous casting production technology, and in particular to a gas diversion system and a ladle furnace. Background Technology

[0002] In continuous casting production, ladle opening refers to the process of steadily releasing molten steel from a ladle through the top nozzle into the tundish or continuous casting mold. Under normal circumstances, after the ladle is opened, the molten steel flows out automatically under gravity, indicating a successful opening. Successful ladle opening is crucial for ensuring the quality of the cast billet.

[0003] If the initial pouring of molten steel relies solely on gravity flow, problems such as clogging of the inlet, turbulent flow of molten steel, slag entrapment, and secondary oxidation can easily occur, affecting the purity of the molten steel and the stability of the pouring. Existing technologies improve the success rate of initial pouring by using oxygen to boil the guiding sand or solidified shell.

[0004] However, while oxygen diversion is effective quickly, it can severely oxidize molten steel, leading to a decrease in the cleanliness of the steel and affecting the quality of the final product. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this application provides a gas diversion system and a ladle furnace. The technical problem to be solved by this application is achieved through the following technical solution: In a first aspect, this application provides a gas drainage system, comprising: A gas mixing device for mixing inert gases and reducing gases to output a mixed gas; The jetting device is connected to the gas mixing device. The jetting device is used to inject mixed gas into the ladle furnace to be cast. The jetting device includes multiple concentrically arranged jetting zones, and each jetting zone includes multiple nozzles distributed around the center at intervals. The control unit is used to control the airflow of multiple jet zones, wherein the airflow of the multiple jet zones decreases sequentially from the inside to the outside, and the airflow of the jet zone includes the sum of the airflow of multiple nozzles located in the jet zone.

[0006] In one embodiment, the jetting device includes: The main body has a central mounting cavity for installing the water inlet. Three jet zones are spaced apart on the main body around the mounting cavity; Along the direction from the inside out, the first nozzle, the second nozzle, and the third nozzle are sequentially arranged in the three jet zones; The number of first nozzles is X, the number of second nozzles is Y, and the number of third nozzles is Z, satisfying X < Y < Z.

[0007] In one embodiment, the three jet zones, arranged from the inside out, include a first jet zone, a second jet zone, and a third jet zone. The airflow ratio of the first jet zone, the second jet zone, and the third jet zone is 4~6:2~4:1~3.

[0008] In one embodiment, the number of first nozzles is 4 to 8; The number of the second nozzle is 10 to 14; The number of third nozzles is 16 to 20.

[0009] In one embodiment, the control unit includes: The first control valve group is used to control the air flow rate of the first jet zone according to the first pulse signal; The second control valve group is used to control the air flow rate of the second jet zone according to the second pulse signal; The third control valve group is used to control the air flow rate of the third jet zone according to the third pulse signal; The phase difference between the second pulse signal and the third pulse signal is 180°.

[0010] In one embodiment, the angle between the jet direction of the nozzle and the central axis of the mounting cavity is 10° to 20°.

[0011] In one embodiment, the volume ratio of the inert gas to the reducing gas is 8.5~9.5:1.5~0.5; The flow rate of the mixed gas is 29~30 NL / min.

[0012] In one embodiment, the inert gas includes argon; Reducing gases include: hydrogen.

[0013] In one embodiment, the gas drainage system further includes: A heating device is connected between the gas mixing device and the jetting device; the heating device is used to heat the mixed gas.

[0014] Secondly, this application provides a ladle furnace, comprising: The casing, with its interior used to contain liquid metal; The water inlet is located at the bottom of the shell and is used to discharge liquid metal. The gas diversion system provided in the first aspect of this application has an air jet device located at the bottom of the housing and fitted onto the water inlet.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: This application employs multiple concentrically arranged jet zones with progressively decreasing gas flow rates. Each jet zone plays a different role during the pouring process, thereby enhancing the ability of the mixed gas to break up the solidified shell and improving flow stability. Furthermore, the mixed gas in this application includes both inert and reducing gases, which, while blowing away the solidified shell, reduces the probability of secondary oxidation of the molten steel, improves the purity of the liquid metal, and increases the success rate of pouring. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 A schematic diagram of the jet device according to an embodiment of this application is shown; Figure 2 A schematic diagram of the jet direction of the jet device according to an embodiment of this application is shown; Figure 3 A top view of a ladle furnace according to an embodiment of this application is shown; Figure 4 A cross-sectional view of a ladle furnace according to an embodiment of this application is shown.

[0017] Figure label: 1. Jet jet device; 11. Body; 111. Mounting cavity; 12. First jet zone; 13. Second jet zone; 14. Third jet zone; 2. Shell; 21. Water inlet. Detailed Implementation

[0018] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments and application scenarios. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. Unless otherwise specified, the following embodiments and features can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present application are within the scope of protection of the present application.

[0019] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] Please see Figure 1 , Figure 1 A schematic diagram of the structure of the jet device 1 according to an embodiment of this application is shown.

[0021] This application provides a gas diversion system, comprising: a gas mixing device, a jetting device 1, and a control unit. The gas mixing device is used to mix inert gas and reducing gas to output a mixed gas. The jetting device 1 is connected to the gas mixing device and is used to inject the mixed gas into the ladle furnace to be cast. The jetting device 1 includes multiple concentrically arranged jetting zones, each jetting zone including multiple nozzles spaced around a center. The control unit controls the gas flow rate of the multiple jetting zones, wherein the gas flow rate of the multiple jetting zones decreases sequentially from the inside out, and the gas flow rate of each jetting zone includes the sum of the gas flow rates of the multiple nozzles located within the jetting zone.

[0022] Specifically, the jetting device 1 is installed outside the inlet 21 of the ladle furnace. Since the molten metal forms a solidified shell at the inlet 21, the jetting device 1 injects mixed gas to open the shell, allowing the molten metal to flow smoothly out of the inlet 21. Therefore, the jetting zone closest to the center of the jetting device 1 is the main drainage zone, where a large flow of mixed gas opens the solidified shell in the inlet 21 area, forming a central channel for the molten metal to flow out. The jetting zone furthest from the center of the jetting device 1 is the barrier and auxiliary zone, where a small flow of mixed gas forms an upward-facing gas curtain, preventing molten metal from backflowing into the nozzle during the initial pouring stage, reducing the risk of blockage. It also moderately softens and pre-disturbs the outer solidified shell, resulting in more uniform shell breaking and reducing the risk of slag entrapment caused by violent local turbulence. In the jet device 1, the jet zone at a moderate distance from the central region is the expansion zone. Through a medium flow rate of mixed gas, the local central channel formed by the main diversion zone is expanded outward, the disturbance range is homogenized, and the problem of only making a narrow hole in the center while the periphery remains blocked is avoided.

[0023] Furthermore, in the mixed gas, the inert gas acts as a guide gas, not participating in the chemical reaction. It mainly relies on bubble bubbling, shearing, and local pressure pulsation to break up and open the solidified shell near the top nozzle 21, while simultaneously forming a stable upward airflow channel in the molten steel, causing the molten steel to converge towards the center of the top nozzle 21. The reducing gas, while not significantly increasing bubble volume or impact force, consumes residual oxygen and inhibits secondary oxidation on the surface of the liquid metal and solidified shell, making the solidified shell easier to break up and reducing the adhesion between the liquid metal and the ladle furnace surface, thus reducing the risk of re-clogging. When the two are combined, argon is responsible for breaking up the solidified shell, while hydrogen is responsible for softening the shell and purifying the interface, which is more conducive to stable casting compared to pure inert gas. Therefore, the mixed gas formed by inert and reducing gases can improve the ability to break up the solidified shell and the stability of the flow, prevent molten steel oxidation, reduce the risk of nozzle clogging, and improve gas utilization efficiency, thereby increasing the success rate of ladle casting.

[0024] In one embodiment, the jetting device 1 includes a body 11 and three jetting zones. The body 11 has a central mounting cavity 111 for mounting an inlet 21. The three jetting zones are spaced apart on the body 11 around the mounting cavity 111. A first nozzle, a second nozzle, and a third nozzle are sequentially arranged within the three jetting zones from the inside out. The number of first nozzles is X, the number of second nozzles is Y, and the number of third nozzles is Z, satisfying X < Y < Z.

[0025] In one embodiment, the number of first nozzles is 4 to 8, the number of second nozzles is 10 to 14, and the number of third nozzles is 16 to 20. Optionally, the first nozzles, second nozzles, and third nozzles are evenly distributed in three jet zones, i.e., the distance between any two first nozzles is equal, the distance between any two second nozzles is equal, and the distance between any two third nozzles is equal.

[0026] In one embodiment, the three jet zones, arranged from the inside out, include a first jet zone 12, a second jet zone 13, and a third jet zone 14. The airflow ratio of the first jet zone 12, the second jet zone 13, and the third jet zone 14 is 4-6:2-4:1-3. For example, the airflow ratio of the first jet zone 12, the second jet zone 13, and the third jet zone 14 is 5:3:2.

[0027] Specifically, the airflow rate of each first nozzle is equal, the airflow rate of each second nozzle is equal, and the airflow rate of each third nozzle is equal. Since the airflow rate of the multiple jet zones decreases sequentially from the inside out, the airflow rates of the first nozzle, second nozzle, and third nozzle decrease sequentially. The first nozzle, second nozzle, and third nozzle are respectively located in the first jet zone 12, the second jet zone 13, and the third jet zone 14. Further, the cross-sectional shape of the jet device 1 is circular, the mounting cavity 111 is a cylindrical cavity, and the multiple jet zones are concentric rings. Since the areas of the first jet zone 12, the second jet zone 13, and the third jet zone 14 increase sequentially, to further achieve uniform jetting, the number of first nozzles is X, the number of second nozzles is Y, and the number of third nozzles is Z, satisfying X < Y < Z, that is, the number of third nozzles is the largest, thus forming a spatial distribution characteristic of denser inside and sparser outside. The mixed gas flow rate ejected from the third jet zone 14 is small, but because the number of third nozzles is the largest, the mixed gas ejected from the third jet zone 14 is approximately continuous in the circumferential direction, which can effectively isolate the liquid metal from the jet device 1 and prevent the liquid metal from clogging the nozzles.

[0028] Furthermore, such as Figure 2 As shown, the angle between the jet direction of the nozzle and the central axis of the mounting cavity 111 is 10°~20°. During installation, the mounting cavity 111 is fitted onto the outside of the upper water inlet 21. Therefore, the mixed gas ejected from the nozzle is directed toward the center of the upper water inlet 21, which can guide and lift the liquid metal to converge toward the center of the upper water inlet 21 in the early stage of pouring, forming a stable flow.

[0029] In this embodiment, the control unit includes a first control valve group, a second control valve group, and a third control valve group. The first control valve group is used to control the airflow rate of the first jet zone 12 according to a first pulse signal, and the second control valve group is used to control the airflow rate of the second jet zone 13 according to a second pulse signal. The third control valve group is used to control the airflow rate of the third jet zone 14 according to a third pulse signal, wherein the phase difference between the second pulse signal and the third pulse signal is 180°.

[0030] In this embodiment, the volume ratio of the inert gas to the reducing gas is 8.5~9.5:1.5~0.5. The flow rate of the mixed gas is 29~30 NL / min.

[0031] Specifically, the inlet of the gas mixing device is connected to an inert gas source via a first mass flow controller, and the inlet of the gas mixing device is connected to a reducing gas source via a second mass flow controller. The inert gas includes argon, and the reducing gas includes hydrogen. The range of the first mass flow controller is 0~100 L / min, and the range of the second mass flow controller is 0~10 L / min. By setting the values ​​of the first and second mass flow controllers, the volume ratio of inert gas to reducing gas in the mixed gas can be controlled. For example, if the volume ratio of inert gas to reducing gas is 9:1, and the flow rate of the mixed gas is 30 NL / min, then the first mass flow controller is set to 27 NL / min, and the second mass flow controller is set to 3 NL / min.

[0032] Furthermore, compared to using pure inert gases or a mixture of argon and nitrogen, introducing a certain proportion of hydrogen can reduce secondary oxidation of molten steel by utilizing its reducing properties, while avoiding the problem of nitrogen accumulation in some steel grades caused by nitrogen. When the proportion of hydrogen is too low, its diffusion and reduction advantages are not obvious, while when the proportion is too high, it will reduce the overall momentum of the gas and increase costs and safety risks.

[0033] In this embodiment, the gas diversion system further includes a heating device. The heating device is connected between the gas mixing device and the jetting device 1, and is used to heat the mixed gas. Exemplarily, the heating device includes a stainless steel tubular electric heater with a power of 15kW, and the heater has a built-in K-type thermocouple for temperature feedback. When the mixed gas flows through the stainless steel tubular electric heater, the residence time is approximately 2 seconds, ensuring heating to 250°C. This causes the mixed gas to expand in volume and increase its kinetic energy, thereby improving its ability to disturb and scour the solidified shell while reducing its cooling effect on the molten steel.

[0034] In one embodiment, the gas diversion system further includes: a plurality of gas distributors, each corresponding to a plurality of jet zones, with one gas distributor connected between a jet zone and a gas mixing device. Further, each gas distributor has one inlet and multiple outlets, the number of outlets corresponding to the number of nozzles in the jet zone.

[0035] In one embodiment, the gas diversion system includes: a first gas distributor, a second gas distributor, and a third gas distributor. A first control valve group includes a first proportional valve and a first solenoid valve; a second control valve group includes a second proportional valve and a second solenoid valve; and a third control valve group includes a third proportional valve and a third solenoid valve. The inlet of the first gas distributor is connected to the outlet of a gas mixing device sequentially through the first solenoid valve, the first proportional valve, and a heating device. Multiple outlets of the first gas distributor are respectively connected to the inlet of a first nozzle. The inlet of the second gas distributor is connected to the outlet of the gas mixing device sequentially through the second solenoid valve, the second proportional valve, and a heating device. Multiple outlets of the second gas distributor are respectively connected to the inlet of a second nozzle. The inlet of the third gas distributor is connected to the outlet of the gas mixing device sequentially through the third solenoid valve, the third proportional valve, and a heating device. Multiple outlets of the third gas distributor are respectively connected to the inlet of a third nozzle.

[0036] Furthermore, the first, second, and third proportional valves are used to regulate the inlet flow rates of the first, second, and third gas distributors, respectively. The first, second, and third solenoid valves are used to regulate the opening and closing of the inlet channels of the first, second, and third gas distributors, respectively. The opening degree of the first, second, and third proportional valves is determined based on the gas flow rate in the jet zone, and the opening degree of the first, second, and third proportional valves remains constant. The control signals for the first, second, and third solenoid valves are the first pulse signal, the second pulse signal, and the third pulse signal, respectively. When a certain pulse signal is high, the corresponding solenoid valve is fully open, and the inlet flow rate of the corresponding gas distributor is the preset flow rate set by the proportional valve. When a certain pulse signal is low, the corresponding solenoid valve is in a throttling state, and the inlet flow rate of the corresponding gas distributor is the minimum threshold flow rate. The minimum threshold flow rate is 10% to 15% of the preset flow rate to avoid the liquid metal clogging the nozzle due to an excessively low minimum threshold flow rate.

[0037] For example, the flow rate of the mixed gas is 30 NL / min, and the gas flow rate ratio of the first jet zone 12, the second jet zone 13, and the third jet zone 14 is 5:3:2. At this time, the inlet flow rates of the first gas distributor, the second gas distributor, and the third gas distributor are 15 NL / min, 9 NL / min, and 6 NL / min, respectively. The first jet zone 12 is set to continuous jetting, while the second jet zone 13 and the third jet zone 14 are set to alternating jetting to enhance the disturbance effect on the liquid metal. Therefore, the first pulse signal is set to a full high level, keeping the first solenoid valve fully open, and the gas flow rate of the first jet zone 12 is always 15 NL / min. The phase difference between the second pulse signal and the third pulse signal is 180°, that is, if the second pulse signal is high, the third pulse signal is low; if the second pulse signal is low, the third pulse signal is high. When the second pulse signal is high, the airflow rate in the second jet zone 13 is 9 NL / min. At this time, when the third pulse signal is high, the airflow rate in the third jet zone 14 is 0.6~0.9 NL / min. When the second pulse signal is low, the airflow rate in the second jet zone 13 is 0.9~1.35 NL / min. At this time, when the third pulse signal is high, the airflow rate in the third jet zone 14 is 6 NL / min.

[0038] This embodiment of the application uses multiple concentrically arranged jet zones to jet gas at progressively decreasing flow rates. Each jet zone plays a different role during the pouring process, thereby improving the ability of the mixed gas to break up the solidified shell and enhancing flow stability. Furthermore, the mixed gas in this embodiment includes inert and reducing gases, which, while blowing away the solidified shell, reduces the probability of secondary oxidation of the molten steel, improves the purity of the liquid metal, and increases the success rate of pouring.

[0039] Please see Figure 3 and Figure 4 , Figure 3 A top view of a ladle furnace according to an embodiment of this application is shown. Figure 4 A cross-sectional view of a ladle furnace according to an embodiment of this application is shown.

[0040] A second aspect of this application provides a ladle furnace, including: a shell 2, a water inlet 21, and a gas diversion system provided in the first aspect of this application. The interior of the shell 2 is used to contain liquid metal. The water inlet 21 is located at the bottom of the shell 2 and is used to discharge liquid metal. An air jet device 1 of the gas diversion system is located at the bottom of the shell 2 and is fitted onto the water inlet 21.

[0041] In one embodiment, the main body 11 of the jet device 1 has a central mounting cavity 111 for docking with the inlet 21. Three annular jet zones are arranged sequentially around the outer periphery of the mounting cavity 111. Taking an inlet 21 with an inner diameter of 100 mm as an example, the first jet zone 12 is approximately 20 mm from the edge of the inlet 21 and has 6 nozzles evenly arranged; the second jet zone 13 is approximately 30 mm from the first jet zone 12 and has 12 nozzles arranged; the third jet zone 14 is approximately 30 mm from the second jet zone 13 and has 18 nozzles arranged. Each nozzle has a diameter of 2 mm, and the angle between the jet direction of the nozzle and the central axis of the mounting cavity 111 is 15°. All nozzles are made of high-temperature resistant alloy material. The jet device 1 is entirely embedded in the refractory layer at the bottom of the housing 2 and is flush with the surface of the housing 2.

[0042] In one embodiment, the ladle furnace further includes multiple pressure sensors and temperature sensors. The pressure sensors are correspondingly disposed on the surfaces of multiple jet zones of the jetting device 1, and are used to monitor the gas pressure in each jet zone. The temperature sensor is disposed on the side wall of the housing 2, and the detection area of ​​the temperature sensor is aligned with the water inlet 21. Exemplarily, the pressure sensor is a sapphire fiber optic high-temperature pressure sensor, with a temperature resistance up to 1800℃ and a measurement range of 0~2MPa. The temperature sensor is a dual-color infrared thermometer, with a measurement wavelength of 0.9~1.1μm and a temperature measurement range of 800~1800℃.

[0043] In one embodiment, the ladle furnace control system connects a pressure sensor and a control unit of the gas diversion system. The ladle furnace control system employs an adaptive fuzzy PID algorithm with a built-in fuzzy rule base. The ladle furnace control system adjusts the pressure deviation based on the pressure deviation e. P and temperature deviation e T Adjust the airflow in multiple jet zones, where e P =Preset pressure value - Average measurement value from multiple pressure sensors, e T =Preset temperature value - Temperature sensor measurement value. When the temperature deviation is e T It is negative, and the pressure deviation e P When the temperature is within the normal range, the ladle furnace control system increases the gas flow rate in multiple jet zones through the control unit of the gas diversion system; when the temperature deviation is within the normal range... T It is positive, and the pressure deviation e P When the value is negative, the ladle furnace control system reduces the gas flow rate in multiple jet zones through the control unit of the gas diversion system.

[0044] Further, the gas drainage system of this embodiment can be installed in the ladle furnace in a retrofitted form. Specifically, first, the bottom of the ladle furnace is machined in the maintenance area, the jet device 1 is sleeved outside the upper water inlet 21, and high-temperature cement is used to repair the machining area at the bottom of the ladle furnace; then, a pressure sensor and an infrared temperature measurement probe are预埋, the signal cables are connected to the control cabinet, and the gas drainage system is subjected to an airtightness test at 1.5 times the working pressure. If there is no leakage after maintaining the pressure for 30 minutes, it is qualified. And the gas drainage system is subjected to cold-state debugging. Under non-heating conditions, the air flow uniformity of each nozzle is checked, the consistency of the outlet air speed is detected by a wind speed meter, and the control valve group, pressure sensor and temperature sensor are calibrated to ensure that the accuracy meets the use requirements.

[0045] In the embodiment of the present application, multiple jetting zones arranged concentrically jet with different gas flow rates. The multiple jetting zones play different roles respectively during the initial pouring process, so as to improve the ability of the mixed gas to break the solidified shell and the drainage stability. Moreover, the mixed gas in the embodiment of the present application includes an inert gas and a reducing gas. While blowing open the solidified shell, it can reduce the probability of secondary oxidation of molten steel, improve the purity of liquid metal and the success rate of ladle initial pouring. In addition, the gas drainage system provided by the embodiment of the present application can be installed in the ladle furnace in a retrofitted form, and can be adapted to multiple models of ladle furnaces.

[0046] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed. It may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described method may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0047] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

Claims

1. A gas diversion system, characterized in that, include: A gas mixing device for mixing inert gases and reducing gases to output a mixed gas; A jetting device, connected to the gas mixing device, is used to inject the mixed gas into the ladle furnace to be cast. The jetting device includes multiple concentrically arranged jetting zones, each jetting zone including multiple nozzles spaced apart around the center. A control unit is configured to control the airflow of a plurality of the jet zones, wherein the airflow of the plurality of jet zones decreases sequentially in a direction from the inside out, and the airflow of the jet zone includes the sum of the airflow of a plurality of nozzles located within the jet zone.

2. The gas diversion system according to claim 1, characterized in that, The jet device includes: The main body has a central mounting cavity for installing a water inlet. Three jet zones are spaced apart on the body around the mounting cavity; Along the direction from the inside out, the first nozzle, the second nozzle, and the third nozzle are sequentially arranged in the three jet zones; Wherein, the number of the first nozzle is X, the number of the second nozzle is Y, and the number of the third nozzle is Z, satisfying X < Y < Z.

3. The gas diversion system according to claim 2, characterized in that, Along the direction from the inside out, the three jet zones include a first jet zone, a second jet zone, and a third jet zone; The airflow ratio of the first jet zone, the second jet zone, and the third jet zone is 4~6:2~4:1~3.

4. The gas diversion system according to claim 2, characterized in that, The number of the first nozzles is 4 to 8; The number of the second nozzle is 10 to 14; The number of the third nozzles is 16 to 20.

5. The gas diversion system according to claim 2, characterized in that, The control unit includes: The first control valve group is used to control the air flow rate of the first jet zone according to the first pulse signal; The second control valve group is used to control the air flow rate of the second jet zone according to the second pulse signal; The third control valve group is used to control the air flow rate of the third jet zone according to the third pulse signal; The phase difference between the second pulse signal and the third pulse signal is 180°.

6. The gas diversion system according to claim 1, characterized in that, The angle between the jet direction of the nozzle and the central axis of the mounting cavity is 10°~20°.

7. The gas diversion system according to any one of claims 1 to 6, characterized in that, The volume ratio of the inert gas to the reducing gas is 8.5~9.5:1.5~0.5; The flow rate of the mixed gas is 29~30 NL / min.

8. The gas diversion system according to any one of claims 1 to 6, characterized in that, The inert gas includes: argon; The reducing gas includes hydrogen.

9. The gas diversion system according to any one of claims 1 to 6, characterized in that, The gas diversion system also includes: A heating device is connected between the gas mixing device and the jetting device, the heating device being used to heat the mixed gas.

10. A ladle furnace, characterized in that, include: The casing, with its interior used to contain liquid metal; A water inlet is located at the bottom of the shell, and the water inlet is used to discharge the liquid metal; According to any one of claims 1 to 9, the gas diversion system is provided at the bottom of the housing and the gas diversion system is sleeved on the upper water inlet.

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