Control method, device and equipment for continuous casting equipment

Abstract

The invention discloses a control method, device and equipment of continuous casting equipment, the continuous casting equipment comprises a tundish, a negative electrode assembly and a power supply, the tundish 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 rod and the submersed nozzle, and the negative electrode of the power supply is in contact with the submersed nozzle. The method comprises the steps that when the continuous casting equipment is in a working state, the current oxygen content of molten steel is obtained; and controlling the current current intensity of the power supply based on the current oxygen content. The technical problem that the inclusions are easily attached to the submersed nozzle and the stopper rod of the tundish is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of continuous casting, and in particular relates to a control method, device and equipment for continuous casting equipment. 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, the molten steel may flow asymmetrically in the crystallizer, and the liquid level fluctuation of the molten steel in 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, and the fallen inclusions enter the crystallizer from the submerged nozzle. The liquid level fluctuation of the molten steel in 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. Therefore, the easy attachment of inclusions to the submerged nozzle and stopper rod of the tundish is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The embodiments of the present invention provide a control method, device and equipment for continuous casting equipment, which solve the technical problem that inclusions are easily attached to the submerged nozzle and stopper rod of the tundish.

[0005] In the first aspect, an embodiment of the present invention provides a control method for a continuous casting equipment, wherein the continuous casting equipment includes a tundish, a negative electrode assembly and a power supply, wherein the tundish includes a stopper rod and an immersion nozzle, the negative electrode assembly is fixedly disposed on the tundish and in contact with molten steel in the tundish, the positive electrode of the power supply is respectively connected to the stopper rod and the immersion nozzle, and the negative electrode of the power supply is connected to the negative electrode assembly, and the method includes: when the continuous casting equipment is in working state, obtaining the current oxygen content of the molten steel; and controlling the current current intensity of the power supply based on the current oxygen content.

[0006] In combination with the first aspect of the present invention, in some embodiments, controlling the current current intensity of the power supply based on the current oxygen content includes: obtaining a lower limit value and an upper limit value of the current intensity, the lower limit value of the current intensity being less than the upper limit value of the current intensity; if the current oxygen content is less than or equal to a preset first oxygen content threshold, using the lower limit value of the current intensity as the current current intensity; if the current oxygen content is greater than the first oxygen content threshold and less than a preset second oxygen content threshold, determining the current current intensity based on the current oxygen content, the second oxygen content threshold being greater than the first oxygen content threshold; if the current oxygen content is greater than or equal to the second oxygen content threshold, using the upper limit value of the current intensity as the current current intensity.

[0007] In combination with the first aspect of the present invention, in some embodiments, determining the current current intensity based on the current oxygen content includes: determining the current current intensity from a preset corresponding relationship based on the current oxygen content; wherein the corresponding relationship is linear and continuous, and the greater the oxygen content, the greater the current intensity.

[0008] In combination with the first aspect of the present invention, in some embodiments, determining the current current intensity based on the current oxygen content includes: determining the current current intensity from a preset corresponding relationship based on the current oxygen content; wherein the corresponding relationship is nonlinear and continuous, and the greater the oxygen content, the greater the increasing trend of the current intensity.

[0009] In combination with the first aspect of the present invention, in some embodiments, determining the current current intensity based on the current oxygen content includes: determining the current current intensity from a preset corresponding relationship based on the current oxygen content; wherein the corresponding relationship is nonlinear and continuous, and the greater the oxygen content, the smaller the increasing trend of the current intensity.

[0010] In combination with the first aspect of the present invention, in some embodiments, determining the current current intensity based on the current oxygen content includes: determining the current current intensity from a preset corresponding relationship based on the current oxygen content; wherein the corresponding relationship is nonlinear and discontinuous, and the current intensity increases in a step-by-step manner as the oxygen content increases.

[0011] In combination with the first aspect of the present invention, in some embodiments, obtaining the lower limit value of current intensity and the upper limit value of current intensity includes: obtaining the carbon content of the molten steel; based on the carbon content, determining the lower limit value of current intensity and the upper limit value of current intensity, wherein the smaller the carbon content, the larger the lower limit value of current intensity and the upper limit value of current intensity.

[0012] In combination with the first aspect of the present invention, in some embodiments, obtaining the current oxygen content of the molten steel includes: obtaining the current oxygen content of the molten steel by a molten steel oxygen analyzer.

[0013] In the second aspect, an embodiment of the present invention provides a control device for a continuous casting equipment, the continuous casting equipment comprising a tundish, a negative electrode assembly and a power supply, the tundish comprising a stopper rod and an immersion nozzle, the negative electrode assembly is fixedly arranged on the tundish and in contact with the molten steel in the tundish, the positive electrode of the power supply is respectively connected to the stopper rod and the immersion nozzle, and the negative electrode of the power supply is connected to the negative electrode assembly, the device comprising: an oxygen content acquisition unit, for acquiring the current oxygen content of the molten steel when the continuous casting equipment is in working state; a current control unit, for controlling the current current intensity of the power supply based on the current oxygen content.

[0014] In a third aspect, an embodiment of the present invention provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any one of the methods described in the first aspect when executing the computer program.

[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 embodiment of the present invention provides a control method for a continuous casting device, wherein the continuous casting device comprises a tundish, a negative electrode assembly and a power source, wherein the tundish comprises a stopper rod and an immersion nozzle, wherein the negative electrode assembly is fixedly arranged in the tundish and contacts the molten steel in the tundish, wherein the positive electrode of the power source is respectively connected to the stopper rod and the immersion nozzle, and wherein the negative electrode of the power source is connected to the negative electrode assembly, wherein the method comprises: when the continuous casting device is in a working state, obtaining the current oxygen content of the molten steel; and controlling the current current intensity of the power source based on the current oxygen content. Since the stopper rod and the immersion nozzle are both connected to the positive electrode of the power source, a positive electric field is formed in the vicinity of the stopper rod and the immersion nozzle, which can repel positively charged particles. Furthermore, since most of the inclusions are positively charged Al2O3 inclusions, the inclusions are not easy to adhere to the immersion nozzle and the stopper rod of the tundish. In addition, since the negative electrode assembly can attract positively charged Al2O3 inclusions, the inclusions are further not easy to adhere to the immersion nozzle and the stopper rod of the tundish. Therefore, the possibility of inclusions adhering to the submerged nozzle and stopper rod of the tundish is reduced.

[0017] In addition, the greater the current oxygen content of the molten steel, the more positively charged Al2O3 inclusions there are. Therefore, controlling the current current intensity of the power supply based on the current oxygen content not only reduces the possibility of inclusion adhesion, but also selects the appropriate current intensity according to the actual situation to avoid wasting electricity. Therefore, the beneficial effect of balancing energy saving and reducing the possibility of inclusion adhesion is also achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 is a flow chart of a control method for continuous casting equipment in an embodiment of the present invention;

[0020] Figure 2 This is a first schematic diagram of the corresponding relationship in an embodiment of the present invention;

[0021] Figure 3 A second schematic diagram of the corresponding relationship in an embodiment of the present invention;

[0022] Figure 4 This is a third schematic diagram of the corresponding relationship in the embodiment of the present invention;

[0023] Figure 5 is a fourth schematic diagram of the corresponding relationship in the embodiment of the present invention;

[0024] Figure 6 It is a functional module diagram of a control device for continuous casting equipment in an embodiment of the present invention;

[0025] Figure 7 FIG. 4 is a schematic diagram of the structure of an electronic device in an embodiment of the present invention. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] The embodiment of the present invention provides a control method for a continuous casting device, wherein the continuous casting device comprises a tundish, a negative electrode assembly and a power supply, wherein the tundish comprises a stopper rod and an immersion nozzle, the negative electrode assembly is fixedly arranged in the tundish and contacts with molten steel in the tundish, the positive electrode of the power supply is respectively connected to the stopper rod and the immersion nozzle, and the negative electrode of the power supply is connected to the negative electrode assembly, and the reference Figure 1 As shown, the method includes the following steps S101-S102:

[0029] S101: When the continuous casting equipment is in operation, the current oxygen content of the molten steel is obtained.

[0030] It should be noted that the higher the oxygen content of the molten steel, the more oxidized inclusions there are, especially the positively charged Al2O3 inclusions. Therefore, the oxygen content characterizes the possibility of inclusions adhering to the submerged nozzle and stopper rod of the tundish.

[0031] In some implementations, obtaining the current oxygen content of the molten steel may include: obtaining the current oxygen content of the molten steel using a molten steel oxygen analyzer.

[0032] S102: Based on the current oxygen content, control the current current intensity of the power supply.

[0033] In some implementations, step S102 includes the following steps S1021 to S1024:

[0034] S1021: Obtain a lower limit value and an upper limit value of current intensity, wherein the lower limit value of current intensity is smaller than the upper limit value of current intensity.

[0035] In some embodiments, obtaining the lower limit value and the upper limit value of the current intensity may include: obtaining the carbon content of the molten steel; and determining the lower limit value and the upper limit value of the current intensity based on the carbon content, wherein the smaller the carbon content, the larger the lower limit value and the upper limit value of the current intensity.

[0036] It should be noted that the lower limit value of the current intensity may be 200A, and the upper limit value of the current intensity may be 400A.

[0037] It should be noted that according to the law of carbon-oxygen balance, 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 and stopper rod of the tundish. Therefore, the lower limit and upper limit of the current intensity are determined based on the carbon content, so that a more suitable current intensity can be selected to avoid the attachment of inclusions due to too low current intensity and the waste of energy due to too high current intensity. Therefore, a balance is achieved between saving energy and reducing the possibility of inclusion attachment.

[0038] S1022: If the current oxygen content is less than or equal to a preset first oxygen content threshold, the current intensity lower limit is used as the current current intensity.

[0039] S1023: If the current oxygen content is greater than the first oxygen content threshold and less than a preset second oxygen content threshold, determine the current intensity based on the current oxygen content, and the second oxygen content threshold is greater than the first oxygen content threshold.

[0040] It should be noted that the first oxygen content threshold may be 0.0010%, and the second oxygen content threshold may be 0.0030%.

[0041] It should be noted that, in step S1023, there are multiple implementations for determining the current current intensity based on the current oxygen content, which are described below by way of example:

[0042] Implementation method 1:

[0043] Based on the current oxygen content, the current current intensity is determined from a preset corresponding relationship; wherein the corresponding relationship is linear and continuous, and the greater the oxygen content, the greater the current intensity.

[0044] refer to Figure 2 As shown, Figure 2 This is a first schematic diagram of the corresponding relationship in an embodiment of the present invention. When the oxygen content is greater than the first oxygen content threshold and less than the second oxygen content threshold, the greater the oxygen content, the greater the current intensity, wherein the corresponding relationship can be expressed by the following formula:

[0045]

[0046] Among them, a is the current current intensity, b is the second oxygen content threshold, c is the first oxygen content threshold, d is the current oxygen content, e is the upper limit of the current intensity, and f is the lower limit of the current intensity.

[0047] It should be noted that, every time the oxygen content increases by a certain value, the current intensity also increases by a certain value. Through the linear and continuous corresponding relationship, the control logic of the current intensity is simplified and the complexity of program implementation is reduced.

[0048] Implementation method 2:

[0049] Based on the current oxygen content, the current current intensity is determined from a preset corresponding relationship; wherein the corresponding relationship is nonlinear and continuous, and the greater the oxygen content, the greater the increasing trend of the current intensity.

[0050] refer to Figure 3 As shown, Figure 3 This is a second schematic diagram of the corresponding relationship in the embodiment of the present invention. When the oxygen content is greater than the first oxygen content threshold and less than the second oxygen content threshold, the greater the oxygen content, the greater the increasing trend of the current intensity.

[0051] It should be noted that if the molten steel is used to produce low-level products, such as low-level automobile plates, a certain amount of inclusions in the molten steel is allowed, and the quality of the ingot is allowed to be low. When the current oxygen content is near the first oxygen content threshold, since the quality of the ingot is allowed to be low, if the current intensity is quickly increased, although the quality level of the ingot is improved, it has no practical production significance and wastes electricity. Therefore, when the current oxygen content is near the first oxygen content threshold, the current intensity is slowly increased to avoid the ingot quality being too low and the waste of electricity. When the current oxygen content is near the second oxygen content threshold, the current intensity is quickly increased to remove a certain amount of inclusions in the molten steel, so it is also possible to avoid the ingot quality being unqualified due to the presence of more inclusions in the molten steel, and it is also possible to avoid the inclusions from adhering to the submerged nozzle and stopper rod of the tundish to a certain extent, so it is also possible to avoid the ingot quality being unqualified due to the attachment of inclusions to a certain extent. Therefore, it is possible to save electricity while ensuring the quality of the ingot.

[0052] Implementation method three:

[0053] Based on the current oxygen content, the current current intensity is determined from a preset corresponding relationship; wherein the corresponding relationship is nonlinear and continuous, and the greater the oxygen content, the smaller the increasing trend of the current intensity.

[0054] refer to Figure 4 As shown, Figure 4 This is a third schematic diagram of the corresponding relationship in the embodiment of the present invention. When the oxygen content is greater than the first oxygen content threshold and less than the second oxygen content threshold, the greater the oxygen content, the smaller the increasing trend of the current intensity.

[0055] It should be noted that if molten steel is used to produce high-level products, such as high-level automotive plates, the molten steel is not allowed to contain too many inclusions at this time, and the quality requirements for the ingots are high. When the current oxygen content is near the first oxygen content threshold, since the ingot quality is allowed to be high, and the higher the current oxygen content, the more inclusions there are, that is, the greater the possibility of a decrease in the quality of the ingot, it is necessary to quickly increase the current intensity to increase the positive electric field strength in the vicinity of the stopper rod and the submerged nozzle, and minimize the possibility of inclusions adhering to the submerged nozzle and stopper rod of the tundish. At the same time, the adsorption force of the negative electrode assembly on positively charged inclusions is increased, and the inclusion content of the molten steel is minimized. Then, the excellent quality of the ingot is guaranteed.

[0056] Implementation method 4:

[0057] Based on the current oxygen content, the current current intensity is determined from a preset corresponding relationship; wherein the corresponding relationship is nonlinear and discontinuous, and the current intensity increases stepwise as the oxygen content increases.

[0058] refer to Figure 5 As shown, Figure 5 This is a fourth schematic diagram of the corresponding relationship in the embodiment of the present invention. When the oxygen content is greater than the first oxygen content threshold and less than the second oxygen content threshold, the current intensity increases stepwise as the oxygen content increases.

[0059] It should be noted that when obtaining the current oxygen content through the molten steel oxygen meter, since the molten steel oxygen meter generally has a small error, the current oxygen content will fluctuate within a small range. If the current intensity is adjusted accordingly every time a small fluctuation in the oxygen content is detected, the workload of the power supply will increase, resulting in a shortened service life of the power supply, and thus shortening the service life of the continuous casting equipment. Therefore, this implementation method limits the current intensity to increase in a step-by-step manner as the oxygen content increases, avoiding frequent adjustments to the current intensity due to small fluctuations in the oxygen content, reducing the workload of the continuous casting equipment, and extending the service life of the continuous casting equipment.

[0060] It should be noted that Figure 2 , Figure 3 , Figure 4 as well as Figure 5 It shows that the current intensity corresponding to the first oxygen content threshold value changes continuously, and the current intensity corresponding to the second oxygen content threshold value also changes continuously, that is, the minimum current intensity in the corresponding relationship is infinitely close to the lower limit of the current intensity, and the maximum current intensity in the corresponding relationship is infinitely close to the upper limit of the current intensity. In other embodiments, the minimum current intensity in the corresponding relationship may be significantly greater than or significantly less than the lower limit of the current intensity, and the maximum current intensity in the corresponding relationship may be significantly greater than or significantly less than the upper limit of the current intensity. In addition, the corresponding relationship may be expressed using a formula, such as the above figure Figure 2 , Figure 3 , Figure 4 as well as Figure 5 In addition, the corresponding relationship may not be expressed using a formula.

[0061] S1024: If the current oxygen content is greater than or equal to the second oxygen content threshold, the current intensity upper limit value is used as the current current intensity.

[0062] It should be noted that the type of steel in the molten steel may be ultra-low carbon steel, and the molten steel of ultra-low carbon steel is more susceptible to the phenomenon of inclusion attachment; wherein the carbon content of the ultra-low carbon steel may be 0 to 0.0030%.

[0063] In some embodiments, the negative electrode assembly 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 absorb inclusions in the molten steel; a negative electrode interface, which is provided 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. It should be noted that since the negative electrode material also has the characteristic of absorbing inclusions in the molten steel when there is no current, the inclusions can be quickly absorbed by the negative electrode assembly, reducing the inclusion content in the molten steel, and thus improving the quality of the ingot.

[0064] In some embodiments, the number of negative electrode assemblies is multiple, and the negative electrode assembly may 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 arranged on the first side of the tundish; a second negative electrode subassembly, the negative electrode of the power source is connected to the second negative electrode subassembly, and the second negative electrode subassembly is fixedly arranged on the second side of the tundish, and the second side is the opposite side of the first side. It should be noted that since the number of negative electrode assemblies is multiple, inclusions can be quickly adsorbed by the negative electrode assemblies, reducing the inclusion content in the molten steel, and thus improving the quality of the ingot.

[0065] In some embodiments, the output voltage of the power supply is 0-35V, and the output current is 0-400A. It should be noted that limiting the output voltage of the power supply to 0-35V will not cause major safety accidents even if the personnel on duty accidentally touch the power supply, thereby improving the safety of the continuous casting equipment.

[0066] In some embodiments, the power supply 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%.

[0067] It should be noted that the power supply can be used to output direct current or pulse current. When the power supply 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 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. In contrast, when the power supply 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 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 is used to output pulse current, the possibility of inclusions adhering to the submerged nozzle and stopper rod of the tundish is further reduced.

[0068] It should be noted that aluminum particles are often used for deoxidation treatment when casting ultra-low carbon steel. In this process, aluminum particles react with oxygen in the molten steel to form Al2O3 inclusions. 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 remaining inclusions are easy to gather at the immersed nozzle, thereby increasing the risk of nozzle blockage. Nozzle blockage can cause the molten steel to flow asymmetrically in the crystallizer, thereby affecting the liquid level fluctuation, causing slag roll defects, and thus affecting the quality of the ingot. 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 the nozzle is blocked, the only option is to change the nozzle. The nozzle change operation is to reduce the drawing speed. The operator installs a new baked nozzle and then increases the drawing speed to normal. There is a close relationship between the oxygen content in the tundish and the nozzle blockage. A high oxygen content in the tundish means that there is more oxygen that can react with the elements in the molten steel to form oxide inclusions. These oxide inclusions are mainly aluminum oxide (Al2O3) inclusions in ultra-low carbon steel grades. Because of their usually small particle size, they are not easy to float up and be removed in the molten steel. When these molten steels pass through the submerged nozzle, these tiny oxide inclusions are easily deposited on the inner wall or outlet of the nozzle, and they continue to accumulate and cause nozzle blockage.

[0069] It should be noted that once the monitoring data shows that the oxygen content is too high, indicating that there is an increased risk of oxide inclusions, the pulse current regulation mechanism will be activated immediately. The principle is that the size of the pulse current can generate inclusion driving force at the contact interface between the molten steel and the inner wall of the nozzle. This force field can promote the redispersion of the fine oxide inclusions that have been formed, prevent their accumulation at the nozzle, and accelerate their floating to the interface of the crystallizer protective slag to be removed, thereby effectively maintaining the nozzle unobstructed.

[0070] It should be noted that, based on historical experience and actual production needs, the sensitive range of casting ultra-low carbon steel to oxygen content is determined to be 0-0.0050%. Therefore, the first oxygen content threshold is set to 0.0010% and the second oxygen content threshold is set to 0.0030%. At the same time, the adjustment output range of the pulse current output by the power supply can be 200-400A, and the pulse voltage is less than 36V to ensure that it can effectively remove oxide inclusions without harming the human body or affecting the quality of molten steel. At the beginning of casting (the first furnace), the lower limit of the current intensity of the pulse current can be set to 200A. When the casting speed of the first furnace is stable, the oxygen content of the molten steel in the tundish is measured. Once the oxygen content is detected to be between the first oxygen content threshold and the second oxygen content threshold, the pulse current adjustment mechanism is immediately triggered, that is, the current current intensity is determined based on the current oxygen content. Based on the real-time feedback of the oxygen content of the tundish in each furnace, a step-by-step adjustment strategy is adopted. The purpose of this design is to ensure that the pulse current can be dynamically adjusted as the oxygen content of each tundish in the casting process is different, so as to more effectively suppress the aggregation of oxide inclusions and nozzle blockage. During the entire casting process, once it is detected that the oxygen content is not between the first oxygen content threshold and the second oxygen content threshold, for example, when the oxygen content is lower than 0.0010%, the current intensity of the pulse current can be set to 200A, and when the oxygen content is higher than 0.0030%, the current intensity of the pulse current can be set to 400A.

[0071] In order to enhance the understanding of the embodiments of the present invention, Figure 2 Take the corresponding relationship as an example, and the first oxygen content threshold is 0.0010%, the second oxygen content threshold is 0.0030%, the lower limit of the current intensity is 200A, and the upper limit of the current intensity is 400A as an example to illustrate: In a certain casting process of 6 furnaces of ultra-low carbon steel, the cross-section is 230mm×1400mm, the pulling speed is 1.6m / min, ultra-low carbon steel protective slag is used, and the superheat is controlled at about 25℃-40℃. At the beginning of the first furnace casting, the current current intensity of the pulse current can be set to 200A according to the regulations. As the casting proceeds, the oxygen content of the first furnace is detected to be 0.0020% after the pulling speed stabilizes. According to the formula, the current current intensity of the pulse current should be adjusted to 300A. Therefore, the control system automatically adjusts the pulse current from the initial 200A to 300A. After implementing this pulse current control scheme, the formation of oxide inclusions was reduced, the purity of the molten steel was improved, the entire casting process was smooth, there was no nozzle blockage, and the physical properties and surface quality of the finished steel met the expected standards.

[0072] The embodiment of the present invention provides a control method for a continuous casting device, wherein the continuous casting device comprises a tundish, a negative electrode assembly and a power source, the tundish comprises a stopper rod and an immersion nozzle, the negative electrode assembly is fixedly arranged in the tundish and contacts the molten steel in the tundish, the positive electrode of the power source is respectively connected to the stopper rod and the immersion nozzle, and the negative electrode of the power source is connected to the negative electrode assembly, and the method comprises: when the continuous casting device is in a working state, obtaining the current oxygen content of the molten steel; and based on the current oxygen content, controlling the current current intensity of the power source. Since the stopper rod and the immersion nozzle are both connected to the positive electrode of the power source, a positive electric field is formed in the vicinity of the stopper rod and the immersion nozzle, which can repel positively charged particles. Since most of the inclusions are positively charged Al2O3 inclusions, the inclusions are not easy to adhere to the immersion nozzle and the stopper rod of the tundish. In addition, since the negative electrode assembly can attract positively charged Al2O3 inclusions, it is further made difficult for the inclusions to adhere to the immersion nozzle and the stopper rod of the tundish. Therefore, the possibility of inclusions adhering to the submerged nozzle and stopper rod of the tundish is reduced.

[0073] In addition, the greater the current oxygen content of the molten steel, the more positively charged Al2O3 inclusions there are. Therefore, controlling the current current intensity of the power supply based on the current oxygen content not only reduces the possibility of inclusion adhesion, but also selects the appropriate current intensity according to the actual situation to avoid wasting electricity. Therefore, the beneficial effect of balancing energy saving and reducing the possibility of inclusion adhesion is also achieved.

[0074] Based on the same inventive concept, Figure 6 As shown, an embodiment of the present invention provides a control device 10 for a continuous casting equipment, the continuous casting equipment includes a tundish, a negative electrode assembly and a power supply, the tundish includes a stopper rod and an immersion nozzle, the negative electrode assembly is fixedly arranged in the tundish and in contact with the molten steel in the tundish, the positive electrode of the power supply is respectively connected to the stopper rod and the immersion nozzle, and the negative electrode of the power supply is connected to the negative electrode assembly. The control device 10 for the continuous casting equipment includes: an oxygen content acquisition unit 110, for acquiring the current oxygen content of the molten steel when the continuous casting equipment is in working state; a current control unit 120, for controlling the current current intensity of the power supply based on the current oxygen content.

[0075] It can be understood that the current control unit 120 includes: a threshold acquisition subunit, which is used to obtain a lower limit value and an upper limit value of the current intensity, wherein the lower limit value of the current intensity is less than the upper limit value of the current intensity; a first setting subunit, which is used to use the lower limit value of the current intensity as the current current intensity if the current oxygen content is less than or equal to a preset first oxygen content threshold value; a second setting subunit, which is used to determine the current current intensity based on the current oxygen content if the current oxygen content is greater than the first oxygen content threshold value and less than a preset second oxygen content threshold value, wherein the second oxygen content threshold value is greater than the first oxygen content threshold value; and a third setting subunit, which is used to use the upper limit value of the current intensity as the current current intensity if the current oxygen content is greater than or equal to the second oxygen content threshold value.

[0076] It can be understood that the second setting subunit is specifically used to: determine the current current intensity from a preset corresponding relationship based on the current oxygen content; wherein the corresponding relationship is linear and continuous, and the greater the oxygen content, the greater the current intensity. Or determine the current current intensity from a preset corresponding relationship based on the current oxygen content; wherein the corresponding relationship is nonlinear and continuous, and the greater the oxygen content, the greater the increasing trend of the current intensity. Or determine the current current intensity from a preset corresponding relationship based on the current oxygen content; wherein the corresponding relationship is nonlinear and continuous, and the greater the oxygen content, the smaller the increasing trend of the current intensity. Or determine the current current intensity from a preset corresponding relationship based on the current oxygen content; wherein the corresponding relationship is nonlinear and discontinuous, and the current intensity increases stepwise with the increase of the oxygen content.

[0077] It can be understood that the threshold acquisition subunit is specifically used to: obtain the carbon content of molten steel; determine the lower limit value and the upper limit value of current intensity based on the carbon content, wherein the smaller the carbon content, the larger the lower limit value and the upper limit value of current intensity.

[0078] It can be understood that the oxygen content acquisition unit 110 is specifically used to obtain the current oxygen content of the molten steel through a molten steel oxygen analyzer.

[0079] It should be understood that more implementation details of the control device 10 of the continuous casting equipment in the embodiment of the present invention refer to the control method of the continuous casting equipment described above, and for the sake of brevity of the specification, they are not repeated here.

[0080] Based on the same inventive concept, an embodiment of the present invention further provides an electronic device, such as Figure 7 As shown, it includes a memory 704, a processor 702, and a computer program stored in the memory 704 and executable on the processor 702. The processor 702 executes the program to implement the steps described in any implementation of the control method embodiment of the continuous casting equipment.

[0081] Among them, Figure 7In the embodiment of the present invention, a bus architecture (represented by bus 700) is shown, which may include any number of interconnected buses and bridges, and bus 700 links various circuits including one or more processors represented by processor 702 and memory represented by memory 704. Bus 700 may also link various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. Bus interface 705 provides an interface between bus 700 and receiver 701 and transmitter 703. Receiver 701 and transmitter 703 may be the same element, namely a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 702 is responsible for managing bus 700 and general processing, while memory 704 may be used to store data used by processor 702 when performing operations.

[0082] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on a computer-readable medium or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of the present invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these. In addition, each functional unit may be integrated into a processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0083] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0084] The units described as separate components may or may not be physically separated, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed in multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0085] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0086] 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 control method for continuous casting equipment, characterized in that: The continuous casting equipment comprises a tundish, a negative electrode assembly and a power source, the tundish comprises a stopper rod and an immersion nozzle, the negative electrode assembly is fixedly arranged on the tundish and contacts with molten steel in the tundish, the positive electrode of the power source is respectively connected to the stopper rod and the immersion nozzle, the negative electrode of the power source is connected to the negative electrode assembly, and the method comprises: When the continuous casting equipment is in working state, obtaining the current oxygen content of the molten steel; Based on the current oxygen content, the current current intensity of the power supply is controlled.

2. The control method of continuous casting equipment according to claim 1, characterized in that: The controlling the current current intensity of the power source based on the current oxygen content comprises: Acquire a lower limit value of current intensity and an upper limit value of current intensity, wherein the lower limit value of current intensity is less than the upper limit value of current intensity; If the current oxygen content is less than or equal to a preset first oxygen content threshold, taking the current intensity lower limit as the current current intensity; If the current oxygen content is greater than the first oxygen content threshold and less than a preset second oxygen content threshold, determining the current current intensity based on the current oxygen content, and the second oxygen content threshold is greater than the first oxygen content threshold; If the current oxygen content is greater than or equal to the second oxygen content threshold, the current intensity upper limit value is used as the current current intensity.

3. The control method of continuous casting equipment according to claim 2, characterized in that: The determining the current current intensity based on the current oxygen content comprises: Based on the current oxygen content, determining the current current intensity from a preset corresponding relationship; The corresponding relationship is linear and continuous, and the greater the oxygen content, the greater the current intensity.

4. The control method of continuous casting equipment according to claim 2, characterized in that: The determining the current current intensity based on the current oxygen content comprises: Based on the current oxygen content, determining the current current intensity from a preset corresponding relationship; The corresponding relationship is nonlinear and continuous, and the greater the oxygen content, the greater the increasing trend of the current intensity.

5. The control method of continuous casting equipment according to claim 2, characterized in that: The determining the current current intensity based on the current oxygen content comprises: Based on the current oxygen content, determining the current current intensity from a preset corresponding relationship; The corresponding relationship is nonlinear and continuous, and the greater the oxygen content, the smaller the increasing trend of the current intensity.

6. The control method of continuous casting equipment according to claim 2, characterized in that: The determining the current current intensity based on the current oxygen content comprises: Based on the current oxygen content, determining the current current intensity from a preset corresponding relationship; The corresponding relationship is nonlinear and discontinuous, and the current intensity increases stepwise with the increase of oxygen content.

7. The control method of continuous casting equipment according to claim 2, characterized in that: The step of obtaining the lower limit value of the current intensity and the upper limit value of the current intensity includes: Obtaining the carbon content of the molten steel; Based on the carbon content, the lower limit value of the current intensity and the upper limit value of the current intensity are determined, wherein the smaller the carbon content is, the larger the lower limit value of the current intensity and the upper limit value of the current intensity are.

8. The control method of the continuous casting equipment according to any one of claims 1 to 7, characterized in that: The obtaining of the current oxygen content of the molten steel comprises: The current oxygen content of the molten steel is obtained by a molten steel oxygen analyzer.

9. A control device for continuous casting equipment, characterized in that: The continuous casting equipment comprises a tundish, a negative electrode assembly and a power source, wherein the tundish comprises a stopper rod and an immersion nozzle, the negative electrode assembly is fixedly arranged on the tundish and contacts with molten steel in the tundish, the positive electrode of the power source is respectively connected to the stopper rod and the immersion nozzle, and the negative electrode of the power source is connected to the negative electrode assembly, and the device comprises: an oxygen content acquisition unit, used to acquire the current oxygen content of the molten steel when the continuous casting equipment is in working state; A current control unit is used to control the current current intensity of the power source based on the current oxygen content.

10. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method according to any one of claims 1 to 8 when executing the computer program.

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