CN113426972B - Crystallizer casting powder control method, device, equipment and storage medium - Google Patents
Crystallizer casting powder control method, device, equipment and storage medium Download PDFInfo
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- CN113426972B CN113426972B CN202110625081.4A CN202110625081A CN113426972B CN 113426972 B CN113426972 B CN 113426972B CN 202110625081 A CN202110625081 A CN 202110625081A CN 113426972 B CN113426972 B CN 113426972B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
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Abstract
The invention relates to the technical field of steel continuous casting, in particular to a method, a device, equipment and a storage medium for controlling crystallizer casting powder, wherein the method comprises the following steps: controlling a heating device to heat the covering slag in the process of injecting molten steel into the crystallizer through the water inlet; controlling the depth of the water immersion nozzle in the molten steel of the crystallizer in the process that the water immersion nozzle moves in the crystallizer; controlling the flow rate of molten steel in the mold contacting the molten steel surface with the mold flux to be within a first set flow rate range and controlling the flow rate of molten steel in the lower molten steel surface contacting the molten steel surface to be within a second set flow rate range according to the depth of the immersion nozzle in the molten steel in the mold. The method ensures that the covering slag has enough heat for melting, and ensures that the covering slag has the functions of lubrication and heat transfer; meanwhile, the entrainment of the crystallizer covering slag is reduced, the stable control of the covering slag is realized, and the steel quality is improved.
Description
Technical Field
The invention relates to the technical field of steel continuous casting, in particular to a method, a device, equipment and a storage medium for controlling crystallizer casting powder.
Background
Continuous casting is a key process in the modern steelmaking production flow, and along with the development of industrial technology, people have higher and higher quality requirements on steel products, especially on products represented by automobile plates. In continuous casting, because molten steel in a crystallizer flows, crystallizer protecting slag is inevitably involved in a steel slag interface, and a large amount of quality blockages and quality objections are brought to the subsequent manufacture of hot rolled coils, cold rolled coils and finished products. The defect of the entrainment of the crystallizer casting slag is always the bottleneck problem of providing high-quality steel by steel enterprises, and is an important index for measuring the steel quality control capability of the steel enterprises. Therefore, the proposal at home and abroad adopts the technologies of electromagnetic braking, electromagnetic stirring and the like to reduce the entrainment of the covering slag at the steel slag interface in the crystallizer. The inclusion of the steel slag interface covering slag is reduced by reducing the reflux strength of the molten steel in the crystallizer and improving the viscosity of the steel slag interface covering slag, so that the defect of the steel genetic covering slag is reduced. However, the existing scheme is limited by the problem of melting of the crystallizer casting powder, so that the surface flow velocity of the steel slag interface is required to be controlled to be more than 0.10m/s, and the stability of reducing the entrainment of the crystallizer casting powder is not high.
Disclosure of Invention
The embodiment of the application provides a method, a device, equipment and a storage medium for controlling the crystallizer covering slag, solves the technical problem of low stability of reducing the entrainment of the crystallizer covering slag in the prior art, and achieves the technical effects of stably controlling the melting of the covering slag, ensuring lubrication and heat transfer and improving the steel quality when reducing the slag entrainment incidence of the crystallizer covering slag.
In a first aspect, an embodiment of the present invention provides a method for controlling mold flux of a crystallizer, where the crystallizer includes: the heating device and the water immersion port are arranged in the crystallizer; the method comprises the following steps:
controlling the heating device to heat the casting powder in the process of injecting molten steel into the crystallizer through the water immersion port;
acquiring the depth of the flooding nozzle in molten steel of the crystallizer in the moving process of the flooding nozzle in the crystallizer;
according to the depth of the immersion nozzle in the molten steel of the crystallizer, controlling the flow rate of the molten steel in the crystallizer, which is in contact with the molten steel surface of the covering slag, within a first set flow rate range, and controlling the flow rate of the molten steel in the lower molten steel surface, which is in contact with the molten steel surface, within a second set flow rate range.
Preferably, said obtaining the depth of said immersion water in the molten steel of said crystallizer comprises:
and in the process that the water immersion nozzle ascends or descends in the molten steel of the crystallizer, the molten steel liquid level of the molten steel injected into the molten steel by the water immersion nozzle is obtained, and the depth of the water immersion nozzle in the molten steel of the crystallizer is determined.
Preferably, the controlling of the molten steel flow rate of the mold in contact with the surface of the mold flux within a first set flow rate range and the molten steel flow rate of the lower surface of the mold in contact with the surface of the mold flux within a second set flow rate range includes:
measuring a first deflection angle of the molten steel in the molten steel contact surface and a second deflection angle of the molten steel in the lower molten steel surface by a speed measuring device; the speed measuring device is arranged in the crystallizer;
and obtaining the molten steel flow velocity of the molten steel contacting the molten steel surface according to the first deflection angle, and obtaining the molten steel flow velocity of the molten steel surface of the lower layer according to the second deflection angle.
Preferably, the measuring a first deflection angle of the molten steel in the molten steel contact surface by the speed measuring device includes:
if the speed measuring device includes: the device comprises a speed measuring rod and a deflection bearing, wherein one end of the speed measuring rod is movably connected with one end of the deflection bearing, so that the speed measuring rod and the deflection bearing are placed in the molten steel contact surface, and the first deflection angle is measured through the speed measuring rod and the deflection bearing.
Preferably, said immersion water head, during movement of said crystallizer, comprises:
and discharging the molten steel through two inclined angle ports symmetrically arranged on the immersion nozzle in the process that the immersion nozzle ascends or descends in the molten steel of the crystallizer, wherein the angle range of the inclined angle ports is 15-50 degrees.
Preferably, the controlling the heating device to heat the mold flux includes:
and controlling the heating device to perform microwave heating on the covering slag within a set distance.
Preferably, the first set flow rate range is-0.10 m/s to +0.10m/s, and the second set flow rate range is 0.10m/s to 0.32m/s, wherein a plus sign indicates a direction of flow toward the immersion nozzle, and a minus sign indicates a reverse direction of flow toward the immersion nozzle.
Based on the same inventive concept, in a second aspect, the present invention further provides a mold flux control device, applied to a mold, the mold comprising: the heating device and the water immersion port are both arranged in the crystallizer; the device comprises:
the heating module is used for controlling the heating device to heat the casting powder in the process of injecting the molten steel into the crystallizer through the water immersion port;
the determining module is used for acquiring the depth of the immersion water inlet in the molten steel of the crystallizer during the movement of the immersion water inlet in the crystallizer;
and the control module is used for controlling the molten steel flow rate of the molten steel in the crystallizer, which is in contact with the molten steel surface of the casting powder, within a first set flow rate range and controlling the molten steel flow rate of the molten steel in the lower molten steel surface, which is in contact with the molten steel surface, within a second set flow rate range according to the depth of the immersion nozzle in the molten steel in the crystallizer.
Based on the same inventive concept, in a third aspect, the invention provides a computer device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor implements the steps of the method for controlling the mold flux when executing the program.
Based on the same inventive concept, in a fourth aspect, the present invention provides a computer-readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the steps of the method for controlling mold flux of a mold.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
1. in the embodiment of the application, when the molten steel continuously passes through the water immersion inlet to the crystallizer, the heating device heats the covering slag, so that the covering slag has enough heat to be melted, and the covering slag is ensured to play a role in lubrication and heat transfer; meanwhile, in the process of adjusting the depth of the water immersion port in the molten steel of the crystallizer, the molten steel is injected through the water immersion port, the flow velocity of the molten steel in the crystallizer, which is in contact with the molten steel surface of the covering slag, is controlled to be within a first set flow velocity range, and the flow velocity of the molten steel in the lower molten steel surface, which is in contact with the molten steel surface, is controlled to be within a second set flow velocity range, so that the entrainment of the covering slag of the crystallizer is reduced, the stable control of the covering slag is realized, and the steel quality is improved. The method provided by the embodiment of the application has great significance in application to a continuous casting process, the surface quality of a plate blank can be greatly improved, a good slagging effect in a crystallizer can be kept, and the occurrence probability of casting blank surface defects and steel leakage is reduced.
2. In the embodiment of the application, the novel microwave heating technology is adopted to directly heat the casting powder in the crystallizer, so that the problems of low efficiency and large investment in melting the casting powder by converting heat energy through heating molten steel in the traditional electromagnetic stirring and electromagnetic braking processes are solved.
3. In the embodiment of the application, the flow rate of the molten steel at the liquid level of the molten steel at different depths is controlled by applying the immersion port with the inclined angle port and adjusting the depth of the immersion port, so that the problem of the flow rate limitation of the molten steel on the surface of the steel slag in the crystallizer in the traditional process is solved. On the basis of not reducing the flow rate of the molten steel at the solidification front in the crystallizer, the flow rate of the molten steel at the steel slag interface in the crystallizer is further reduced, the entrainment of the covering slag is reduced, and the purpose of stably controlling the slag entrainment of the covering slag in the crystallizer is achieved.
Drawings
Various additional advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic flow chart illustrating the steps of a mold flux control method according to an embodiment of the present invention;
FIG. 2 is a schematic view showing the structure of a heating device, an immersion water port and the like in the crystallizer in the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a speed measuring device in an embodiment of the present invention;
FIG. 4 is a block diagram showing a control apparatus for mold flux in an embodiment of the present invention;
fig. 5 shows a schematic structural diagram of a computer device in an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Example one
The first embodiment of the invention provides a method for controlling crystallizer mold flux, which is applied to a crystallizer. The structure of the crystallizer will be explained first. As shown in fig. 2, the mold 200 includes: the casting powder comprises the casting powder 201, a heating device 202, a water immersion inlet 203 and a speed measuring device 204, wherein the heating device 202, the water immersion inlet 203 and the speed measuring device 204 are all arranged in the crystallizer 200, and the casting powder 201 floats on the upper surface of molten steel. When the heating means 202 is preferably a microwave heating means, the microwave heating means is disposed in the copper plate around the mold 200. The submerged nozzle 203 is movable in the mold 200 to inject molten steel into the mold 200. During the process that the molten steel is injected into the mold 200 through the submerged nozzle 203, the molten steel forms an upper backflow and a lower backflow, thereby affecting the flow rates of the molten steel at different depths.
In order to clearly explain the control method of the present embodiment, as shown in fig. 1, the control method of the present embodiment includes:
s101, controlling a heating device 202 to heat the casting powder 201 in the process of injecting molten steel into the crystallizer 200 through an immersion nozzle 203;
s102, in the moving process of the water immersion nozzle 203 in the crystallizer 200, acquiring the depth of the water immersion nozzle 203 in the molten steel of the crystallizer 200;
s103, controlling the flow rate of the molten steel in the mold 200, which contacts the molten steel surface of the mold flux 201, within a first set flow rate range and controlling the flow rate of the molten steel in the lower molten steel surface, which contacts the molten steel surface, within a second set flow rate range according to the depth of the immersion nozzle 203 in the molten steel in the mold 200.
In the control method of the embodiment, when the molten steel continuously passes through the water immersion port 203 to the crystallizer, the heating device 202 heats the mold powder 201, so that the mold powder 201 has enough heat to melt, and the mold powder 201 is ensured to play a role in lubrication and heat transfer. And then in the process of adjusting the depth of the water immersion port 203 in the molten steel of the crystallizer 200, the molten steel is injected through the water immersion port 203, the flow rate of the molten steel in the crystallizer 200, which is in contact with the molten steel surface of the casting powder 201, is controlled to be within a first set flow rate range, and the flow rate of the molten steel in the lower molten steel surface, which is in contact with the molten steel surface, is controlled to be within a second set flow rate range, so that the entrainment of the casting powder 201 of the crystallizer is reduced, the stable control of the casting powder 201 is realized, and the steel quality is improved.
The following describes in detail the specific implementation steps of the method provided in this embodiment with reference to fig. 1:
first, step S101 is performed to control the heating device 202 to heat the mold flux 201 while molten steel is being poured into the mold 200 through the inlet 203.
Specifically, in the process of injecting molten steel into the mold 200 through the water inlet 203, the heating device 202 is controlled to perform microwave heating on the mold flux 201 within a set distance. Among them, the heating device 202 is preferably a microwave heating device. The set distance is a distance from the upper opening of the mold 200 to a certain molten steel level in the mold 200, and is usually set to 100mm, and may be set according to actual needs. The distance is set so that the heating range completely covers the thickness of the mold powder 201, the mold powder 201 is sufficiently heated, the mold powder 201 has enough heat to be melted, and the mold powder 201 is ensured to play a role in lubrication and heat transfer.
In the embodiment, the heating of the covering slag 201 in the crystallizer 200 is realized by adopting a microwave heating principle, the problems of the reduction of the reflux intensity of the molten steel in the crystallizer 200 and the melting of the covering slag 201 caused by insufficient heat supply are solved, the thickness of the liquid slag of the covering slag 201 is stably controlled to be 15-20mm, and the stable supply of the liquid slag in the crystallizer 200 is realized.
The microwave heating principle is that dipole molecules inside an object to be heated reciprocate at high frequency to generate 'internal friction heat' to raise the temperature of the object to be heated, so that the inside and the outside of the object can be simultaneously heated and simultaneously raised without any heat conduction process, the heating speed is high and uniform, and the heating purpose can be achieved only by one or several tenths of the energy consumption of the traditional heating mode.
Next, step S102 is executed to acquire the depth of the immersion nozzle 203 in the molten steel in the mold 200 during the movement of the immersion nozzle 203 in the mold 200.
Specifically, the molten steel level of the molten steel poured into the mold 200 by the submerged nozzle 203 is obtained during the process that the submerged nozzle 203 ascends or descends in the molten steel in the mold 200, and the depth of the submerged nozzle 203 in the molten steel in the mold 200 is determined according to the molten steel level. For example, when the molten steel is poured into the water inlet 203 at a molten steel level of 30 mm, the depth of the water inlet 203 in the molten steel in the mold 200 is 30 mm. The depth of the immersion nozzle 203 in the molten steel can be measured by a liquid level detector, or can be measured by other measuring devices, which is not limited herein.
Then, step S103 is performed to control the molten steel flow rate of the mold 200 contacting the molten steel surface of the mold flux 201 to be within a first set flow rate range and to control the molten steel flow rate of the molten steel surface of the lower layer contacting the molten steel surface to be within a second set flow rate range, according to the depth of the immersion nozzle 203 in the molten steel of the mold 200.
Specifically, the molten steel flow rate contacting the liquid surface of the molten steel is controlled within a first set flow rate range and the molten steel flow rate contacting the lower liquid surface of the molten steel is controlled within a second set flow rate range by the depth of the submerged nozzle 203 in the molten steel of the mold 200 during the ascent or descent of the submerged nozzle 203 in the molten steel of the mold 200. Wherein the first set flow rate range is-0.10 m/s to +0.10m/s, and the second set flow rate range is 0.10m/s to 0.32m/s. Wherein a positive sign represents a direction of flow to the immersion nozzle and a negative sign represents a reverse direction of flow to the immersion nozzle. It should be noted that the contact steel level is a level at which molten steel contacts the mold flux 201, that is, a distance from the molten steel level contacting the mold flux 201 to the first molten steel level, as shown in H1 in fig. 2, and generally the contact steel level is in a range of 0 to 20mm, which may be set according to actual requirements. The lower molten steel level contacting the molten steel level is the distance from the first molten steel level to the second molten steel level, and H2 shown in fig. 2 is usually 20mm to 50mm, and may be set according to actual requirements.
It should be noted that, as shown in fig. 2, two inclined angle ports are symmetrically disposed on the immersion nozzle 203, and the angle of the inclined angle ports ranges from 15 ° to 50 °, and particularly, the angle of the inclined angle ports is downward, i.e., the angle β shown in fig. 2, and is usually selected to be 45 °. The molten steel is injected through the inclined angle port of the water immersion port 203, so that the backflow strength of the molten steel in the crystallizer 200 is reduced, the molten steel is injected through the molten steel liquid levels at different depths of the water immersion port 203, namely, the backflow strength of the molten steel in the crystallizer 200 is further reduced by adjusting the insertion depth of the water immersion port, the entrainment of the casting powder 201 is reduced, and the stable control of the slag entrainment of the casting powder 201 is realized.
In the actual operation process, the flow rate of the molten steel at different depths is controlled by adjusting the insertion depth of the water immersion nozzle, wherein the flow rate of the molten steel within a range of 0-20mm from the liquid level of the molten steel contacting the casting powder 201 is controlled within-0.10 m/s to +0.10m/s, and the flow rate of the molten steel within a range of 20-50 mm from the liquid level of the molten steel contacting the casting powder 201 is controlled within 0.10m/s to 0.32m/s, so that the flow rate of the molten steel at the steel-powder interface in the crystallizer 200 is reduced, the influence of backflow on the molten steel on the casting powder 201 at the steel-powder interface is eliminated, the higher flow rate of the molten steel at the solidification front in the crystallizer 200 is ensured, the casting powder 201, bubbles and inclusions are prevented from being caught by meniscus solidification hooks of the molten steel, and the slag entrapment rate of the casting powder 201 is reduced.
When the molten steel flow rate in the mold 200, which contacts the molten steel surface of the mold flux 201, is controlled to be within a first set flow rate range, and the molten steel flow rate in the lower molten steel surface, which contacts the molten steel surface, is controlled to be within a second set flow rate range, the molten steel flow rate is measured by the speed measurement device 204, and the specific measurement process is as follows:
measuring a first deflection angle of molten steel in a contact molten steel surface and a second deflection angle of molten steel in a lower molten steel surface by a speed measuring device 204; wherein, the speed measuring device 204 is arranged in the crystallizer 200; and obtaining the molten steel flow rate of the molten steel contacting the molten steel surface according to the first deflection angle, and obtaining the molten steel flow rate of the molten steel surface at the lower layer according to the second deflection angle.
As shown in fig. 3, the speed measuring device 204 includes: velocity measurement stick 2041 and yaw bearing 2042, velocity measurement stick 2041 one end and yaw bearing 2042 one end swing joint.
Specifically, a speed measuring rod 2041 and a deflection bearing 2042 are placed in a molten steel contact surface, and a first deflection angle is measured through the speed measuring rod 2041 and the deflection bearing 2042; and obtaining the molten steel flow velocity contacting the molten steel surface according to the first deflection angle. Placing a speed measuring rod 2041 and a deflection bearing 2042 in a lower-layer liquid surface, and measuring a second deflection angle through the speed measuring rod 2041 and the deflection bearing 2042; and obtaining the molten steel flow speed of the lower molten steel level according to the second deflection angle. The two sets of speed measuring devices 204 may be used to measure the molten steel flow rate contacting the molten steel surface and the molten steel flow rate of the molten steel surface at the lower layer, or the same set of speed measuring devices 204 may be used to measure the molten steel flow rate contacting the molten steel surface and the molten steel flow rate of the molten steel surface at the lower layer in sequence, which is not limited herein.
Generally, the flow velocity of molten steel obtained from the deflection angle is based on the formula y =0.0007x 2 -0.0005x +0.0109, wherein y is the molten steel flow rate and the unit is: m/s, x is the deflection angle θ of velocity measuring rod 2041, shown as θ in FIG. 3; the flow velocity of the molten steel obtained from the deflection angle can also be obtained from other algorithms, which are not limited herein.
By the test mode, the accuracy of the flow velocity of the molten steel can be higher, so that the flow velocity of the molten steel contacting the molten steel surface is accurately ensured to be within-0.10 m/s to +0.10m/s, and the flow velocity of the molten steel on the lower molten steel surface is within 0.10m/s to 0.32m/s.
In order to more clearly understand the control method of the embodiment, detailed explanation is made by the following example.
1. When a steel factory injects automobile steel with the section of 1100mm and the pulling speed of 1.7m/min, a microwave heating device is used for heating crystallizer protection slag within the range of 100mm away from the upper opening of a crystallizer, a water immersion opening with an inclined opening with an inclination angle of 45 degrees is used, molten steel is injected into the crystallizer at the liquid levels of the molten steel at different depths, and a speed measuring device is used for measuring the flow rates of the molten steel at different depths. Molten steel is injected by continuously adjusting the liquid level of the molten steel at different depths of the immersion nozzle, when the liquid level of the molten steel at the immersion nozzle is within the range of 270mm-320mm, the flow rate of the molten steel at the position 15mm away from the steel slag interface is stabilized within-0.10 m/s to +0.10m/s, the flow rate of the molten steel at the position 40mm away from the steel slag interface is stabilized within 0.10m/s to 0.32m/s, and the immersion depth range of the water gap under the injection working condition is fixed to be 270mm-320mm. At the moment, the thicknesses of the liquid slag layer and the sintering layer in the crystallizer are respectively measured to be 18mm and 20mm, the process requirements are met, and the slag entrapment index of the covering slag under the 1100mm section is reduced to 0.30 from 1.25 after the control method of the embodiment is adopted.
2. When steel for automobiles is injected into a certain steel mill, the section is 1900mm, the pulling speed is 1.0m/min, when a microwave heating device is used for heating crystallizer protecting slag within 100mm from an upper opening of a crystallizer, molten steel is injected into the crystallizer at the liquid levels of the molten steel at different depths by using an immersion nozzle with an inclined opening of 45 degrees, and the flow rates of the molten steel at different depths are measured by adopting a speed measuring device. Molten steel is injected by continuously adjusting the liquid level of the molten steel at different depths of the water inlet, when the liquid level of the molten steel at the water inlet is controlled within the range of 170mm-220mm, the flow rate of the molten steel at the position 15mm away from the steel slag interface is stabilized within-0.10 m/s to +0.10m/s, the flow rate of the molten steel at the position 40mm away from the steel slag interface is stabilized within 0.10m/s to 0.32m/s, and the immersion depth range of the water gap under the injection working condition is fixed to be 170mm-220mm. At the moment, the thicknesses of the liquid slag layer and the sintering layer in the crystallizer are measured to be 16mm and 21mm respectively, the process requirements are met, and the slag entrapment index of the covering slag under the 1900-section is reduced from 0.80 to 0.25.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
1. in the embodiment, when the molten steel continuously passes through the water immersion inlet to the crystallizer, the heating device heats the covering slag, so that the covering slag has enough heat to be melted, and the covering slag is ensured to play roles in lubrication and heat transfer; meanwhile, in the process of adjusting the depth of the water immersion port in the molten steel of the crystallizer, the molten steel is injected through the water immersion port, the flow velocity of the molten steel in the crystallizer, which is in contact with the molten steel surface of the covering slag, is controlled to be within a first set flow velocity range, and the flow velocity of the molten steel in the lower molten steel surface, which is in contact with the molten steel surface, is controlled to be within a second set flow velocity range, so that the entrainment of the covering slag of the crystallizer is reduced, the stable control of the covering slag is realized, and the steel quality is improved. The method has great significance in the application of the method to the continuous casting process, not only can greatly improve the surface quality of the slab, but also can keep good slagging effect in the crystallizer and reduce the occurrence probability of casting blank surface defects and steel leakage.
2. In the embodiment, a novel microwave heating technology is adopted to directly heat the casting powder in the crystallizer, so that the problems of low efficiency and large investment in melting the casting powder by converting heating molten steel into heat energy in the traditional electromagnetic stirring and electromagnetic braking processes are solved.
3. In the embodiment, the flow rate of the molten steel at the molten steel liquid level at different depths is controlled by applying the immersion port with the inclined angle port and adjusting the depth of the immersion port, so that the problem of the flow rate limitation of the molten steel on the surface of the steel slag in the crystallizer in the traditional process is solved. On the basis of not reducing the flow rate of the molten steel at the solidification front in the crystallizer, the flow rate of the molten steel at the steel slag interface in the crystallizer is further reduced, the entrainment of the covering slag is reduced, and the purpose of stably controlling the slag entrainment of the covering slag in the crystallizer is achieved.
Example two
Based on the same inventive concept, a second embodiment of the present invention further provides a mold flux control device for a mold, which is applied to a mold, the mold comprising: the heating device and the water immersion port are both arranged in the crystallizer; as shown in fig. 4, the apparatus includes:
the heating module 301 is used for controlling the heating device to heat the mold flux in the process of injecting the molten steel into the crystallizer through the water inlet;
a determining module 302 for acquiring the depth of the submerged nozzle in the molten steel of the crystallizer during the movement of the submerged nozzle in the crystallizer;
and the control module 303 is configured to control the molten steel flow rate of the molten steel on the molten steel surface of the mold contacting the mold flux to be within a first set flow rate range and control the molten steel flow rate of the molten steel on the lower molten steel surface of the mold contacting the molten steel surface to be within a second set flow rate range according to the depth of the immersion nozzle in the molten steel of the mold.
As an alternative embodiment, the determining module 302 is further configured to:
and in the process that the water immersion nozzle ascends or descends in the molten steel of the crystallizer, the molten steel liquid level of the molten steel injected into the molten steel by the water immersion nozzle is obtained, and the depth of the water immersion nozzle in the molten steel of the crystallizer is determined.
As an alternative embodiment, the control module 303 is further configured to:
measuring a first deflection angle of the molten steel in the molten steel contact surface and a second deflection angle of the molten steel in the lower molten steel surface by a speed measuring device; the speed measuring device is arranged in the crystallizer;
and obtaining the molten steel flow velocity of the molten steel contacting the molten steel surface according to the first deflection angle, and obtaining the molten steel flow velocity of the molten steel surface of the lower layer according to the second deflection angle.
As an alternative embodiment, the measuring, by a speed measuring device, a first deflection angle of the molten steel in the contact molten steel surface includes:
if the speed measuring device includes: the device comprises a speed measuring rod and a deflection bearing, wherein one end of the speed measuring rod is movably connected with one end of the deflection bearing, so that the speed measuring rod and the deflection bearing are placed in the contact molten steel surface, and the first deflection angle is measured through the speed measuring rod and the deflection bearing.
As an alternative embodiment, said immersion water during the movement of said crystallizer comprises:
and discharging the molten steel through two inclined angle ports symmetrically arranged on the immersion nozzle in the process that the immersion nozzle ascends or descends in the molten steel of the crystallizer, wherein the angle range of the inclined angle ports is 15-50 degrees.
As an alternative embodiment, the heating module 301 is further configured to:
and controlling the heating device to perform microwave heating on the covering slag within a set distance.
As an alternative embodiment, the first set flow rate range is-0.10 m/s to +0.10m/s, and the second set flow rate range is 0.10m/s to 0.32m/s, wherein the positive sign indicates a direction toward the immersion nozzle, and the negative sign indicates a reverse direction toward the immersion nozzle.
Since the control device for mold flux described in this embodiment is a device used for implementing the control method for mold flux in the first embodiment of this application, based on the control method for mold flux described in the first embodiment of this application, those skilled in the art can understand the specific implementation manner and various modifications of the control device for mold flux in this embodiment, and therefore how to implement the method in the first embodiment of this application by the control device for mold flux is not described in detail herein. As long as those skilled in the art implement the apparatus used in the method for controlling mold flux of a crystallizer in the first embodiment of the present application, all of the apparatuses are within the scope of protection of the present application.
EXAMPLE III
Based on the same inventive concept, the third embodiment of the present invention further provides a computer device, as shown in fig. 5, comprising a memory 404, a processor 402 and a computer program stored on the memory 404 and operable on the processor 402, wherein the processor 402, when executing the program, implements the steps of any one of the above-mentioned mold flux control methods.
Where in fig. 3 a bus architecture (represented by bus 400), bus 400 may include any number of interconnected buses and bridges, bus 400 linking together various circuits including one or more processors, represented by processor 402, and memory, represented by memory 404. The bus 400 may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface 406 provides an interface between the bus 400 and the receiver 401 and transmitter 403. The receiver 401 and the transmitter 403 may be the same element, i.e., a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 402 is responsible for managing the bus 400 and general processing, and the memory 404 may be used for storing data used by the processor 402 in performing operations.
Example four
Based on the same inventive concept, a fourth embodiment of the present invention also provides a computer-readable storage medium, having a computer program stored thereon, which, when being executed by a processor, implements the steps of any one of the methods of controlling mold flux described in the first embodiment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A method for controlling mold flux of a mold is characterized by being applied to a mold, and the mold comprises: the heating device and the water immersion port are arranged in the crystallizer; the method comprises the following steps:
controlling the heating device to perform microwave heating on the casting powder within a set distance in the process of injecting molten steel into the crystallizer through the water immersion port;
acquiring the depth of the immersion water inlet in the molten steel of the crystallizer during the movement of the immersion water inlet in the crystallizer;
controlling the flow rate of molten steel in the mold, which contacts a molten steel surface of the mold flux, to be within a first set flow rate range and the flow rate of molten steel in a lower molten steel surface of the mold flux to be within a second set flow rate range according to the depth of the immersion nozzle in the molten steel in the mold, wherein the first set flow rate range is-0.10 m/s to +0.10m/s, and the second set flow rate range is 0.10m/s to 0.32m/s, and wherein a positive sign represents a flow direction to the immersion nozzle and a negative sign represents a flow direction to the immersion nozzle;
wherein the contact steel level is a distance from a molten steel level contacting the mold flux to a first molten steel level, and the contact steel level is in a range of 0 to 20 mm; the lower layer steel level is the distance from the first molten steel level to the second molten steel level, and the lower layer steel level ranges from 20mm to 50 mm.
2. The method according to claim 1, wherein said taking the depth of said immersion water in the molten steel of said crystallizer comprises:
and in the process that the water immersion nozzle ascends or descends in the molten steel of the crystallizer, the molten steel liquid level of the molten steel injected into the molten steel by the water immersion nozzle is obtained, and the depth of the water immersion nozzle in the molten steel of the crystallizer is determined.
3. The method of claim 1, wherein the controlling of the flow rate of the molten steel in the mold in contact with the surface of the mold flux within a first set flow rate range and the flow rate of the molten steel in the lower surface of the mold in contact with the surface of the mold flux within a second set flow rate range comprises:
measuring a first deflection angle of the molten steel in the molten steel contact surface and a second deflection angle of the molten steel in the lower molten steel surface by a speed measuring device; the speed measuring device is arranged in the crystallizer;
and obtaining the molten steel flow velocity of the molten steel contacting the molten steel surface according to the first deflection angle, and obtaining the molten steel flow velocity of the molten steel surface of the lower layer according to the second deflection angle.
4. The method of claim 3, wherein measuring a first deflection angle of the molten steel in the contact molten steel surface by a velocity measuring device comprises:
if the speed measuring device includes: the device comprises a speed measuring rod and a deflection bearing, wherein one end of the speed measuring rod is movably connected with one end of the deflection bearing, so that the speed measuring rod and the deflection bearing are placed in the molten steel contact surface, and the first deflection angle is measured through the speed measuring rod and the deflection bearing.
5. The method according to claim 1, characterized in that said moving of said immersion water in said crystallizer comprises:
and discharging the molten steel through two inclined angle ports symmetrically arranged on the immersion nozzle in the process that the immersion nozzle ascends or descends in the molten steel of the crystallizer, wherein the angle range of the inclined angle ports is 15-50 degrees.
6. A control device of mold flux is characterized by being applied to a mold, and the mold comprises: the heating device and the water immersion port are both arranged in the crystallizer; the device comprises:
the heating module is used for controlling the heating device to carry out microwave heating on the covering slag within a set distance in the process of injecting the molten steel into the crystallizer through the water immersion port;
the determining module is used for acquiring the depth of the immersion water inlet in the molten steel of the crystallizer during the movement of the immersion water inlet in the crystallizer;
the control module is used for controlling the flow rate of molten steel in the crystallizer, which is in contact with the molten steel surface of the casting powder, to be within a first set flow rate range and controlling the flow rate of molten steel in the lower molten steel surface, which is in contact with the molten steel surface, to be within a second set flow rate range according to the depth of the immersion nozzle in the molten steel of the crystallizer, wherein the first set flow rate range is-0.10 m/s to +0.10m/s, the second set flow rate range is 0.10m/s to 0.32m/s, the positive sign represents the direction of flowing to the immersion nozzle, and the negative sign represents the reverse direction of flowing to the immersion nozzle; wherein the contact steel level is a distance from a molten steel level contacting the mold flux to a first molten steel level, and the contact steel level is in a range of 0 to 20 mm; the lower layer steel liquid level is the distance from the first molten steel liquid level to the second molten steel liquid level, and the range of the lower layer steel liquid level is 20mm to 50 mm.
7. Computer arrangement comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor realizes the method steps of any of claims 1-5 when executing the computer program.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method steps of any one of claims 1 to 5.
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| JP3385982B2 (en) * | 1998-10-26 | 2003-03-10 | 住友金属工業株式会社 | Continuous casting method |
| CN2362624Y (en) * | 1999-02-11 | 2000-02-09 | 北京科技大学 | Submerged type pouring head for continuous casting thin sheet blank |
| JP4380171B2 (en) * | 2002-03-01 | 2009-12-09 | Ｊｆｅスチール株式会社 | Flow control method and flow control device for molten steel in mold and method for producing continuous cast slab |
| JP2006255759A (en) * | 2005-03-18 | 2006-09-28 | Jfe Steel Kk | Method for continuously casting steel |
| KR100749027B1 (en) * | 2006-06-23 | 2007-08-13 | 주식회사 포스코 | Continuous casting machine and method using molten mold flux |
| CN102554158A (en) * | 2012-01-17 | 2012-07-11 | 中冶南方工程技术有限公司 | Arrangement structure for immersive water gap for large and square billet continuous casting crystallizer |
| CN103837701B (en) * | 2012-11-26 | 2016-06-29 | 宝山钢铁股份有限公司 | The measurement apparatus of molten steel near surface flow velocity and method |
| CN103464705A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | Electromagnetic flow control method for slowing fluctuation of liquid level of crystallizer |
| JP6604149B2 (en) * | 2015-11-05 | 2019-11-13 | 日本製鉄株式会社 | Continuous casting method |
| CN108500228B (en) * | 2017-02-27 | 2020-09-25 | 宝山钢铁股份有限公司 | Flow field control method for slab continuous casting crystallizer |
| CN210498296U (en) * | 2019-10-09 | 2020-05-12 | 辽宁科技大学 | Device for adding heated solid-state covering slag into crystallizer in continuous casting process |
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