Continuous casting equipment and control method thereof

Abstract

The invention discloses continuous casting equipment and a control method thereof, and the continuous casting equipment comprises a tundish which comprises a stopper rod and a submersed nozzle; the negative electrode assembly is fixedly arranged in the tundish and is in contact with molten steel in the tundish; the positive electrode of the power supply is connected with the stopper and the submersed nozzle, and the negative electrode of the power supply is connected with the negative electrode assembly. According to the invention, the technical problem that inclusions are easily attached to the submersed nozzle and the stopper rod of the tundish is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of continuous casting, and in particular relates to a continuous casting device and a control method thereof. Background Art

[0002] The submerged nozzle is the molten steel outlet of the tundish, and the molten steel flowing out of the submerged nozzle enters the crystallizer. The stopper rod is a refractory rod installed in the tundish to control the opening and closing of the submerged nozzle and the flow of molten steel by lifting and displacement.

[0003] There are many inclusions in the molten steel in the tundish. If the inclusions are attached to the submerged nozzle of the tundish, the submerged nozzle may be blocked. Then, when the molten steel enters the crystallizer from the submerged nozzle, it may cause the molten steel to flow asymmetrically in the crystallizer, and the liquid level fluctuation of the molten steel on the unblocked side of the crystallizer will increase significantly, causing the protective slag on the surface of the molten steel in the crystallizer to be drawn into the molten steel, reducing the quality of the ingot. If the inclusions are attached to the stopper rod of the tundish, as the number of attached inclusions increases, the inclusions on the stopper rod may fall off. The fallen inclusions enter the crystallizer from the submerged nozzle, which will also cause the liquid level fluctuation of the molten steel in the crystallizer to increase significantly, causing the protective slag on the surface of the molten steel in the crystallizer to be drawn into the molten steel, reducing the quality of the ingot. Therefore, it is a technical problem that inclusions are easily attached to the submerged nozzle and stopper rod of the tundish, which needs to be solved urgently. Summary of the invention

[0004] The embodiment of the present invention provides a continuous casting device and a control method thereof, which solves the technical problem that inclusions are easily attached to the submerged nozzle and the stopper rod of the tundish.

[0005] In a first aspect, an embodiment of the present invention provides a continuous casting device, comprising: a tundish, the tundish comprising a stopper rod and an immersed water nozzle; a negative electrode assembly, fixedly disposed on the tundish and in contact with molten steel in the tundish; a power supply, the positive electrode of the power supply being respectively connected to the stopper rod and the immersed water nozzle, and the negative electrode of the power supply being connected to the negative electrode assembly.

[0006] In combination with the first aspect of the present invention, in some embodiments, the number of the negative electrode assembly is one, and the negative electrode assembly is fixedly disposed on one side or in the middle of the intermediate package.

[0007] In combination with the first aspect of the present invention, in some embodiments, the number of the negative electrode assemblies is multiple, and the negative electrode assemblies include: a first negative electrode sub-assembly, to which the negative electrode of the power supply is connected, and the distance between the first negative electrode sub-assembly and the plug rod is less than a first preset distance; a second negative electrode sub-assembly, to which the negative electrode of the power supply is connected, and the distance between the second negative electrode sub-assembly and the immersion water outlet is less than a second preset distance.

[0008] In combination with the first aspect of the present invention, in some embodiments, the first negative electrode sub-assembly is disposed around the stopper rod, and the second negative electrode sub-assembly is disposed around the immersion water outlet.

[0009] In combination with the first aspect of the present invention, in some embodiments, the number of the negative electrode assemblies is multiple, and the negative electrode assembly includes: a first negative electrode sub-assembly, to which the negative electrode of the power source is connected, and the first negative electrode sub-assembly is fixedly arranged on the first side of the intermediate package; a second negative electrode sub-assembly, to which the negative electrode of the power source is connected, and the second negative electrode sub-assembly is fixedly arranged on the second side of the intermediate package, and the second side is the opposite side of the first side.

[0010] In combination with the first aspect of the present invention, in some embodiments, the negative electrode assembly includes: a negative electrode material, which is a conductive refractory material and is in contact with the molten steel, and the negative electrode material is used to adsorb inclusions in the molten steel; a negative electrode interface, which is arranged at one end of the negative electrode material and is not in contact with the molten steel, and the negative electrode interface is connected to the negative electrode of the power supply.

[0011] In combination with the first aspect of the present invention, in some implementations, the output voltage of the power supply is 0-35V, and the output current is 0-400A.

[0012] In combination with the first aspect of the present invention, in some embodiments, the power supply is used to output a pulse current, and the frequency of the pulse current is 0 to 50,000 Hz and the duty cycle is 10% to 80%.

[0013] In a second aspect, an embodiment of the present invention provides a control method for a continuous casting equipment, which is applied to the continuous casting equipment as described in any one of the first aspects, and the method includes: obtaining the steel grade of the molten steel in the ladle of the continuous casting equipment; and adjusting the output current of the power supply based on the steel grade.

[0014] In combination with the second aspect of the present invention, in some embodiments, adjusting the output current of the power supply based on the steel grade includes: determining the current increase based on the steel grade; and adjusting the output current of the power supply based on the current increase and a preset baseline output current.

[0015] One or more technical solutions provided by the embodiments of the present invention achieve at least the following technical effects or advantages:

[0016] The continuous casting equipment provided by the embodiment of the present invention includes: a tundish, which includes a stopper rod and an immersion nozzle; a negative electrode assembly, which is fixedly arranged in the tundish and contacts the molten steel in the tundish; a power supply, the positive electrode of which is respectively connected to the stopper rod and the immersion nozzle, and the negative electrode of which is connected to the negative electrode assembly. Since the stopper rod and the immersion nozzle are both connected to the positive electrode of the power supply, a positive electric field will be formed in the vicinity of the stopper rod and the immersion nozzle, which can repel positively charged particles. In addition, since most inclusions are positively charged Al 2 O 3 Inclusions, therefore, are not easy to adhere to the immersion nozzle and stopper rod of the tundish. In addition, since the negative electrode assembly can attract positively charged Al 2 O 3 Inclusions further make it difficult for inclusions to adhere to the submerged nozzle and stopper rod of the tundish. Therefore, the possibility of inclusions adhering to the submerged nozzle and stopper rod of the tundish is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 Schematic diagram of continuous casting equipment in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0021] Figure 1Schematic diagram of continuous casting equipment in an embodiment of the present invention. Figure 1 As shown, a continuous casting device provided by an embodiment of the present invention includes: a tundish 10, the tundish 10 includes a stopper rod 110 and an immersion nozzle 120; a negative electrode assembly 20, fixedly arranged on the tundish 10 and in contact with the molten steel in the tundish 10; a power supply 30, the positive electrode of the power supply 30 is respectively connected to the stopper rod 110 and the immersion nozzle 120, and the negative electrode of the power supply 30 is connected to the negative electrode assembly 20.

[0022] It should be noted that the submerged nozzle is the molten steel outlet of the tundish, and the molten steel flowing out of the submerged nozzle enters the crystallizer 40. The stopper rod is a refractory rod installed in the tundish and controls the opening and closing of the submerged nozzle and the flow of molten steel by lifting and displacing.

[0023] In some embodiments, the negative electrode assembly 20 may include: a negative electrode material, which is a conductive refractory material and is in contact with the molten steel, and the negative electrode material is used to adsorb inclusions in the molten steel; a negative electrode interface, which is arranged at one end of the negative electrode material and is not in contact with the molten steel, and the negative electrode interface is connected to the negative electrode of the power supply 30.

[0024] It should be noted that, since the negative electrode material also has the property of absorbing inclusions in molten steel when there is no current, the inclusions can be quickly absorbed by the negative electrode assembly 20, reducing the inclusion content in the molten steel and improving the quality of the ingot. The negative electrode interface can be a steel pipe interface.

[0025] It should be noted that the number of the negative electrode assembly 20 can be one or more, as illustrated below:

[0026] Implementation method 1:

[0027] The number of the negative electrode assembly 20 is one, and the negative electrode assembly 20 is fixedly disposed on one side or in the middle of the intermediate package 10 .

[0028] It should be noted that, when there is only one negative electrode assembly 20, the possibility of inclusions adhering to the submerged nozzle 120 and the stopper rod 110 of the tundish 10 can be reduced, and the beneficial effect of cost saving can be achieved. In this case, the negative electrode assembly 20 can be fixedly arranged on the cover of the tundish 10.

[0029] Implementation method 2:

[0030] There are multiple negative electrode assemblies 20, and the negative electrode assemblies 20 may include: a first negative electrode sub-assembly, to which the negative electrode of the power supply 30 is connected, and the distance between the first negative electrode sub-assembly and the plug rod 110 is less than a first preset distance; a second negative electrode sub-assembly, to which the negative electrode of the power supply 30 is connected, and the distance between the second negative electrode sub-assembly and the immersion water outlet 120 is less than a second preset distance.

[0031] It should be noted that the distance between the first negative electrode subassembly and the stopper rod 110 is less than the first preset distance, indicating that the first negative electrode subassembly is disposed in the vicinity of the stopper rod 110, and the first negative electrode subassembly is mainly used to absorb inclusions near the stopper rod 110. The distance between the second negative electrode subassembly and the immersion nozzle 120 is less than the second preset distance, indicating that the second negative electrode subassembly is disposed in the vicinity of the immersion nozzle 120, and the second negative electrode subassembly is mainly used to absorb inclusions near the immersion nozzle 120.

[0032] It should be noted that if the distance between the stopper rod 110 or the immersion nozzle 120 and the negative electrode assembly 20 is too large, then, if there are inclusions in the vicinity of the stopper rod 110 or the immersion nozzle 120, the inclusions cannot be quickly adsorbed by the negative electrode assembly 20, which may cause the inclusions to adhere to the stopper rod 110 or the immersion nozzle 120. Therefore, a first negative electrode subassembly is provided in the vicinity of the stopper rod 110. Then, if there are inclusions in the vicinity of the stopper rod 110, the first negative electrode subassembly can quickly adsorb the inclusions to prevent the inclusions from adhering to the stopper rod 110. A second negative electrode subassembly is provided in the vicinity of the immersion nozzle 120. Then, if there are inclusions in the vicinity of the immersion nozzle 120, the second negative electrode subassembly can quickly adsorb the inclusions to prevent the inclusions from adhering to the immersion nozzle 120. Therefore, the negative electrode assembly 20 is respectively arranged near the stopper rod 110 and the submerged nozzle 120 to improve the efficiency of adsorbing inclusions. Furthermore, since the inclusions can be quickly adsorbed by the negative electrode assembly 20, the inclusion content in the molten steel is reduced, thereby improving the quality of the ingot.

[0033] It should be noted that the first negative electrode sub-assembly and the second negative electrode sub-assembly can be installed in a variety of ways, which are illustrated below by way of example: first, the first negative electrode sub-assembly can be arranged in a surrounding manner on the stopper rod 110, and the second negative electrode sub-assembly can be arranged in a surrounding manner on the immersion water outlet 120; wherein, the negative electrode interface of the first negative electrode sub-assembly can be fixedly arranged on the cover of the intermediate ladle 10, and the shape of the negative electrode material of the first negative electrode sub-assembly is annular and is arranged in a surrounding manner on the stopper rod 110, and the negative electrode interface of the second negative electrode sub-assembly can be fixedly arranged on the cover of the intermediate ladle 10, and the shape of the negative electrode material of the second negative electrode sub-assembly is annular and is arranged in a surrounding manner on the immersion water outlet 120. The second type is that the first negative electrode subassembly can be arranged in a surrounding manner on the stopper rod 110, and the second negative electrode subassembly can be arranged in a surrounding manner on the immersion water outlet 120; wherein, the negative electrode interface of the first negative electrode subassembly can be fixedly arranged on the cover of the intermediate ladle 10, and the shape of the negative electrode material of the first negative electrode subassembly is annular and is arranged in a surrounding manner on the stopper rod 110, and the negative electrode interface of the second negative electrode subassembly can be fixedly arranged on the bottom area of ​​the intermediate ladle 10, and the shape of the negative electrode material of the second negative electrode subassembly is annular and is arranged in a surrounding manner on the immersion water outlet 120. The third type is that the first negative electrode subassembly may be arranged around the stopper rod 110, and the second negative electrode subassembly may be arranged around the immersion nozzle 120; wherein, the negative electrode interface of the first negative electrode subassembly may be fixedly arranged at the bottom area of ​​the tundish 10, the negative electrode material of the first negative electrode subassembly is annular in shape and arranged around the stopper rod 110, the negative electrode interface of the second negative electrode subassembly may be fixedly arranged at the bottom area of ​​the tundish 10, and the negative electrode material of the second negative electrode subassembly is annular in shape and arranged around the immersion nozzle 120. It should also be noted that the cover of the tundish 10 refers to the top area of ​​the tundish 10, which is opposite to the bottom area of ​​the tundish 10.

[0034] Implementation method three:

[0035] There are multiple negative electrode assemblies 20, and the negative electrode assemblies 20 may include: a first negative electrode sub-assembly, to which the negative electrode of the power source 30 is connected, and the first negative electrode sub-assembly is fixedly arranged on the first side of the intermediate bag 10; a second negative electrode sub-assembly, to which the negative electrode of the power source 30 is connected, and the second negative electrode sub-assembly is fixedly arranged on the second side of the intermediate bag 10, and the second side is the opposite side of the first side.

[0036] It should be noted that, since there are multiple negative electrode assemblies 20 , inclusions can be quickly adsorbed by the negative electrode assemblies 20 , which reduces the inclusion content in the molten steel and improves the quality of the ingot.

[0037] Implementation method 4:

[0038] There are multiple negative electrode assemblies 20, multiple immersion water inlets 120, multiple stopper rods 110, and a negative electrode assembly 20 is correspondingly arranged in the vicinity of an immersion water inlet 120 and a stopper rod 110, and the number of negative electrode assemblies 20 is equal to the number of groups formed by the immersion water inlet 120 and the stopper rod 110, wherein an immersion water inlet 120 and a corresponding stopper rod 110 form a group.

[0039] It should be noted that, by disposing a negative electrode assembly 20 in the vicinity of a group of submerged nozzles 120 and the stopper rod 110, the adsorption efficiency of inclusions can be improved, the inclusion content in the molten steel can be reduced, and the quality of the ingot can be improved.

[0040] In some embodiments, the output voltage of the power supply 30 is 0-35V, and the output current is 0-400A.

[0041] It should be noted that the output voltage of the power supply 30 is limited to 0-35V. Even if the personnel on duty accidentally touch the power supply 30, no major safety accident will occur, thereby improving the safety of the continuous casting equipment.

[0042] In some embodiments, the power supply 30 is used to output a pulse current, wherein the frequency of the pulse current is 0 to 50,000 Hz and the duty cycle is 10% to 80%.

[0043] It should be noted that the power supply 30 can be used to output direct current or pulse current. When the power supply 30 is used to output direct current, under the action of the electric field, the inclusions in the molten steel mainly move in a left-right direction. At this time, the negative electrode component 20 can absorb a certain amount of inclusions, but there are still uncharged inclusions, negatively charged inclusions and some positively charged inclusions that are not absorbed by the negative electrode component 20. In contrast, when the power supply 30 is used to output pulse current, if the pulse current is of high current intensity, the inclusions in the molten steel mainly move in a left-right direction. At this time, the negative electrode component 20 can absorb a certain amount of inclusions. If the pulse current is of low current intensity, the inclusions float up under the action of buoyancy and combine with the molten steel protective slag, further reducing the inclusion content in the molten steel. Therefore, when the power supply 30 is used to output pulse current, the possibility of inclusions adhering to the submerged nozzle 120 and the stopper rod 110 of the tundish 10 is further reduced.

[0044] It should be noted that aluminum particles are often used for deoxidation when casting ultra-low carbon steel. In this process, aluminum particles react with oxygen in the steel liquid to form Al 2 O 3Inclusions. Although small particles of inclusions are easy to collide, aggregate, grow and float up to be removed during the subsequent calming and casting process, some inclusions are not completely removed and remain in the molten steel. These residual inclusions are easy to gather at the immersed nozzle 120, thereby increasing the risk of nozzle blockage. Nozzle blockage is related to many process factors, including the cleanliness of the molten steel and the occurrence of secondary oxidation, nozzle material, argon flow rate and other factors. When nozzle blockage occurs, the only option is to change the nozzle. The operation of changing the nozzle is to reduce the pulling speed. The operator installs a new baked nozzle and then increases the pulling speed to normal levels. There is a close relationship between the oxygen content in the tundish 10 and nozzle blockage. The high oxygen content in the tundish 10 means that there is more oxygen that can react with the elements in the molten steel to form oxidized inclusions. These oxidized inclusions are mainly reflected in the form of aluminum oxide (Al2O3) in ultra-low carbon steel grades. 2 O 3 ) type inclusions are usually small in size and are not easy to float up and be removed in the molten steel. When the molten steel passes through the submerged nozzle 120, these tiny oxide inclusions are easily deposited on the inner wall or outlet of the nozzle, and continue to accumulate and cause nozzle blockage.

[0045] It should be noted that if the negative electrode of the power source 30 is connected to the stopper rod 110, and the positive electrode of the power source 30 is connected to the submerged nozzle 120, this connection method will reduce the inclusions on the inner wall of the submerged nozzle 120, but will increase the inclusions in the stopper rod 110. The inclusions of the stopper rod 110 may fall off and cause large liquid level fluctuations, thereby causing the quality of the casting to decrease. Therefore, in the embodiment of the present invention, the positive electrode of the power source 30 is connected to the stopper rod 110 and the submerged nozzle 120, respectively, and the negative electrode of the power source 30 is connected to the negative electrode assembly 20.

[0046] The material of the negative electrode assembly 20 not only has good conductivity, but also is resistant to high temperatures and corrosion. It can work stably for a long time in an extreme continuous casting environment, ensuring that the electrochemical reaction is continuous and effective, while not interfering with the flow field and cleanliness of the ladle 10.

[0047] In some embodiments, before baking the tundish 10, a refractory material with conductive properties can be embedded in a specific position inside the tundish 10 to serve as the negative electrode component 20 for the subsequent electrochemical reaction. The negative electrode clamp is firmly clamped on the exposed steel pipe interface of the conductive refractory material to ensure reliable connection of the current path. The positive electrode connection wire is connected to the tail of the stopper rod 110 and the immersed water nozzle 120 of the tundish 10 respectively, and these components will be connected to the power supply system as the positive electrode of the current. Turn on the power supply 30 control panel, first click "voltage setting", enter the safety setting value 0~35V (lower than the human safety voltage limit) to prevent operational safety risks. Enter the "frequency setting" interface, enter the initial frequency range can be any value from 0 to 50000Hz, and then enter any value from 10% to 80% in the "duty cycle setting" column, providing a wide adjustment space for preliminary tests. In the "current setting" option, the pulse current is initially set to 20A to prepare for system preheating and preliminary testing. After confirming that all settings are correct, start the power supply 30 and let the system run for 2 minutes. During this period, closely monitor the average current value to ensure that it is stable, which helps to evaluate whether the system status is normal. When the casting speed stabilizes to the target casting speed, readjust the "current setting" according to the characteristics of the cast steel type and the real-time casting situation, and enter the appropriate pulse current intensity between 100 and 400A to achieve the best inclusion control effect. During the entire casting process, continuously monitor the actual performance of current, voltage, frequency and duty cycle, and make fine adjustments when necessary to ensure the best metallurgical effect. After the casting is completed, immediately click the "Stop" button to stop the power supply 30 output to prevent unnecessary energy consumption and safety hazards. Safely remove the positive and negative terminal clamps to ensure that the electrical connection is completely disconnected. Finally, turn off the power supply 30 switch to complete the power-on operation of the entire casting cycle.

[0048] In order to enhance the understanding of the embodiments of the present invention, the following example is given: a casting of ultra-low carbon steel is performed in 7 continuous castings, the cross section is 230mm×1600mm, the casting speed is 1.3m / min, ultra-low carbon steel protective slag is used, the superheat is controlled at about 20℃~35℃, and before the tundish 10 is baked, a conductive refractory material is installed inside the tundish 10 as a negative electrode assembly 20 to ensure that it is reliably connected to the negative electrode of the power supply 30, and the positive electrode of the power supply 30 is connected to the stopper rod 110 and the submerged nozzle 120 to construct a complete power-on circuit. Use the control panel to set the voltage range to 0~35V, the frequency to 10000Hz, the duty cycle to 40%, and preliminarily set the pulse current to 20A to preheat the system and conduct preliminary tests. Start the power supply 30, and observe that the current is normal after running for 2 minutes. As the casting begins, the pulling speed rises to 1.3m / min, and the pulse current is adjusted to 150A. The whole process is monitored and various parameters are adjusted in time to achieve the best inclusion control and stable casting process. After the casting is completed, the machine is stopped in time, the electrode connection is disconnected, and the power supply 30 is turned off to complete the power-on control of the entire casting cycle. The 7 furnaces were observed for the replacement of the lower nozzles, and it can be observed that the submerged nozzle 120 is not blocked and the inner wall is good. Through this method, it can be found that this method is simple to operate, has a significant effect, and improves the quality of the casting.

[0049] The continuous casting equipment provided by the embodiment of the present invention includes: a tundish 10, the tundish 10 includes a stopper rod 110 and an immersion nozzle 120; a negative electrode assembly 20, which is fixedly arranged on the tundish 10 and in contact with the molten steel in the tundish 10; a power supply 30, the positive electrode of the power supply 30 is respectively connected to the stopper rod 110 and the immersion nozzle 120, and the negative electrode of the power supply 30 is connected to the negative electrode assembly 20. Since the stopper rod 110 and the immersion nozzle 120 are both connected to the positive electrode of the power supply 30, a positive electric field will be formed in the vicinity of the stopper rod 110 and the immersion nozzle 120, which can repel positively charged particles. And since most of the inclusions are positively charged Al 2 O 3 Therefore, the inclusions are not easy to adhere to the submerged nozzle 120 and the stopper rod 110 of the tundish 10. In addition, since the negative electrode assembly 20 can attract the positively charged Al 2 O 3 The inclusions are further prevented from being attached to the submerged nozzle 120 and the stopper rod 110 of the tundish 10. Therefore, the possibility of the inclusions being attached to the submerged nozzle 120 and the stopper rod 110 of the tundish 10 is reduced.

[0050] Based on the same inventive concept, an embodiment of the present invention provides a control method for continuous casting equipment, which is applied to the continuous casting equipment. The method includes: obtaining the steel type of molten steel in a tundish 10 of the continuous casting equipment; and adjusting the output current of the power supply 30 based on the steel type.

[0051] In some embodiments, adjusting the output current of the power supply 30 based on the steel type may include: determining the current increase based on the steel type; and adjusting the output current of the power supply 30 based on the current increase and a preset reference output current.

[0052] In some embodiments, the output current of the power supply 30 is adjusted based on the current increase and the preset reference output current, which can be: taking the sum of the current increase and the preset reference output current as the desired output current; determining the current duty cycle from a preset corresponding relationship based on the desired output current; and controlling the power supply 30 based on the current duty cycle so that the output current of the power supply 30 reaches the desired output current.

[0053] It should be noted that the steel type can be low carbon steel or ultra-low carbon steel, wherein the carbon content of low carbon steel can be 0.0030% to 0.25%, and the carbon content of ultra-low carbon steel can be 0 to 0.0030%. If the steel type is low carbon steel, the current increase can be 100A, and the reference output current can be 20A. If the steel type is ultra-low carbon steel, the current increase can be 200A, and the reference output current can be 20A. According to the carbon-oxygen balance law, the lower the carbon content, the higher the oxygen content, and the more oxidized inclusions there are. At this time, a higher current intensity needs to be set to effectively prevent inclusions from adhering to the submerged nozzle 120 and the stopper rod 110 of the tundish 10. Therefore, by adjusting the output current of the power supply 30 according to the steel type, a more suitable current intensity can be selected to avoid the adhesion of inclusions due to too small current intensity, and to avoid the waste of energy due to too large current intensity. Therefore, a balance between energy saving and reducing the possibility of inclusion adhesion is achieved.

[0054] It should be understood that more implementation details of the control method of the continuous casting equipment in the embodiment of the present invention refer to the aforementioned continuous casting equipment, and for the sake of brevity of the specification, they will not be repeated here.

[0055] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A continuous casting device, characterized in that: include: A tundish, the tundish comprising a stopper rod and a submerged nozzle; A negative electrode assembly is fixedly disposed on the tundish and is in contact with the molten steel in the tundish; A power supply, wherein the positive electrode of the power supply is respectively connected to the stopper rod and the immersion water outlet, and the negative electrode of the power supply is connected to the negative electrode assembly.

2. The continuous casting equipment according to claim 1, characterized in that: The number of the negative electrode assembly is one, and the negative electrode assembly is fixedly arranged on one side or in the middle of the intermediate package.

3. The continuous casting equipment according to claim 1, characterized in that: The number of the negative electrode components is multiple, and the negative electrode components include: a first negative electrode sub-assembly, to which the negative electrode of the power source is connected, and a distance between the first negative electrode sub-assembly and the plug rod is less than a first preset distance; A second negative electrode sub-assembly, the negative electrode of the power source is connected to the second negative electrode sub-assembly, and the distance between the second negative electrode sub-assembly and the immersion water outlet is less than a second preset distance.

4. The continuous casting equipment according to claim 3, characterized in that: The first negative electrode sub-assembly is disposed around the stopper rod, and the second negative electrode sub-assembly is disposed around the immersion water outlet.

5. The continuous casting equipment according to claim 1, characterized in that: The number of the negative electrode components is multiple, and the negative electrode components include: A first negative electrode subassembly, the negative electrode of the power source is connected to the first negative electrode subassembly, and the first negative electrode subassembly is fixedly disposed on the first side of the intermediate package; A second negative sub-assembly, the negative electrode of the power source is connected to the second negative sub-assembly, and the second negative sub-assembly is fixedly arranged on the second side of the intermediate package, and the second side is the opposite side of the first side.

6. The continuous casting equipment according to claim 1, characterized in that: The negative electrode assembly comprises: A negative electrode material, which is a conductive refractory material and is in contact with the molten steel, and is used to absorb inclusions in the molten steel; A negative electrode interface is arranged at one end of the negative electrode material and is not in contact with the molten steel. The negative electrode interface is connected to the negative electrode of the power source.

7. The continuous casting equipment according to claim 1, characterized in that: The output voltage of the power supply is 0-35V, and the output current is 0-400A.

8. The continuous casting equipment according to any one of claims 1 to 7, characterized in that: The power supply is used to output a pulse current, the frequency of the pulse current is 0 to 50000 Hz, and the duty cycle is 10% to 80%.

9. A control method for continuous casting equipment, applied to the continuous casting equipment as claimed in any one of claims 1 to 8, characterized in that: The method comprises: Obtaining the steel grade of the molten steel in the tundish of the continuous casting equipment; Based on the steel grade, an output current of the power supply is adjusted.

10. The control method of continuous casting equipment according to claim 9, characterized in that: The step of adjusting the output current of the power supply based on the steel type includes: Based on the steel type, determining an amount of current increase; The output current of the power supply is adjusted based on the current increase amount and a preset reference output current.

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