CN114247863B - Control method, system, equipment and medium for secondary cooling device for improving quality of continuous casting billet - Google Patents
Control method, system, equipment and medium for secondary cooling device for improving quality of continuous casting billet Download PDFInfo
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- CN114247863B CN114247863B CN202111663218.1A CN202111663218A CN114247863B CN 114247863 B CN114247863 B CN 114247863B CN 202111663218 A CN202111663218 A CN 202111663218A CN 114247863 B CN114247863 B CN 114247863B
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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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1226—Accessories for subsequent treating or working cast stock in situ for straightening strands
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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
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/10—Numerical modelling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
Abstract
The application relates to the technical field of continuous casting, and provides a method, a system, equipment and a medium for controlling a secondary cooling device for improving the quality of a continuous casting billet, wherein the method comprises the following steps: constructing a three-dimensional temperature field simulation model based on a finite element analysis method; real-time obtaining three-dimensional temperature field information of the continuous casting blank by using a three-dimensional temperature field simulation model; based on three-dimensional temperature field information respectively acquired by the continuous casting billet in the arc-shaped area and the straightening area, respectively adjusting the water quantity of the nozzle loops in the middle and the side of the arc-shaped area and the straightening area until the temperature of the corners of the continuous casting billet in the straightening area is higher than the brittle temperature corresponding to the current casting steel grade; based on three-dimensional temperature field information obtained by the continuous casting billet in the horizontal region, regulating the water quantity of the secondary cooling nozzle loop in the horizontal region until the continuous casting billet forms a regular solidification morphology; according to the current casting steel type and technological conditions, the soft reduction process is dynamically implemented to improve the quality of the continuous casting blank, and the application obviously improves the surface and internal quality of the continuous casting blank.
Description
Technical Field
The application relates to the field of continuous casting, and provides a method, a system, equipment and a medium for controlling a secondary cooling device for improving the quality of a continuous casting billet.
Background
In the continuous casting production process, high-temperature liquid molten steel is continuously cooled through a primary cooling area, a vertical area, a bending area, an arc area, a straightening area, a horizontal area and the like of a crystallizer to form a casting blank with a liquid core with a certain thickness, and finally, the casting blank is completely solidified. The solidification process condition of the continuous casting blank is a main factor for determining the quality of the casting blank, and how to improve the quality of the casting blank is an important subject of continuous technical attack in the metallurgical field for many years. In recent years, with the increasing requirements of engineering projects such as ocean platforms, heavy machinery, nuclear power military industry and the like on the quality of slabs, the task of improving the quality of casting blank products is more urgent.
Wherein, the distribution and the change condition of the temperature of the continuous casting billet have important influence on the surface and the internal quality of the casting billet. Because the two-dimensional heat transfer at the corners of the slab is caused by the fact that the temperature at the corners of the slab is obviously lower than the temperature at the middle part of the casting blank, the phenomenon of supercooling at the corners is formed, the phenomenon of supercooling at the corners can easily lead the temperature at the corners of the casting blank to fall into a brittle temperature zone (the brittle temperature zone of steel is usually 700-900 ℃), and at the moment, the straightening of the casting blank is carried out, so that the cracks at the corners of the slab are extremely easy to generate.
Meanwhile, in the actual production process, the transverse water flow density of the casting blank is difficult to be completely and uniformly distributed, the transverse temperature deviation of the casting blank exceeds 200 ℃ at maximum, and the difference between the first solidification position and the last solidification position of the casting blank is 0.5-1.5 m. The heat stress of the casting blank in the transverse direction is increased, and quality problems such as cracks of the casting blank are aggravated; the irregular solidification morphology causes that the optimal position under soft reduction is difficult to determine, so that the metallurgical effect of improving the center segregation and center porosity of the casting blank under dynamic soft reduction is not obvious enough.
Disclosure of Invention
The application provides a control method, a system, equipment and a medium of a secondary cooling device for improving the quality of a continuous casting billet, which mainly aim to dynamically and accurately control the water spraying amount according to an arc-shaped area, a straightening area and a horizontal area respectively, prevent the corner of a slab from being supercooled in the straightening area, avoid the crack of the corner of the slab, form regular solidification morphology to the maximum extent and obtain the optimal soft reduction metallurgy effect.
In order to achieve the above object, the present application provides a secondary cooling device control method for improving the quality of a continuous casting slab, the method comprising:
constructing a three-dimensional temperature field simulation model based on a finite element analysis method;
acquiring three-dimensional temperature field information of the continuous casting blank in real time by utilizing the three-dimensional temperature field simulation model;
based on three-dimensional temperature field information respectively acquired by the continuous casting billet in an arc-shaped area and a straightening area, respectively adjusting the water quantity of a middle nozzle loop and a side nozzle loop of the arc-shaped area and the straightening area until the temperature of the corner of a casting billet in the straightening area is higher than the brittleness temperature corresponding to the current casting steel grade;
based on three-dimensional temperature field information obtained by the continuous casting billet in a horizontal area, regulating the water quantity of a secondary cooling nozzle loop in the horizontal area until the continuous casting billet forms a regular solidification morphology;
according to the current casting steel type and process conditions, a soft reduction process is dynamically implemented to improve the quality of the continuous casting billet.
Optionally, the acquiring three-dimensional temperature field information of the continuous casting billet in real time by using the three-dimensional temperature field simulation model includes:
acquiring three-dimensional temperature field information of the continuous casting machine in the form of two-cooling control areas, two-cooling control area positions and cooling corresponding to the arc-shaped area, the straightening area and the horizontal area respectively according to the three-dimensional temperature field simulation model, wherein the three-dimensional temperature field information of the two-cooling control area comprises target surface temperature of a target control point and preset temperature deviation; and determining the brittleness temperature of the steel grade according to the high-temperature characteristic of the continuous casting blank when the steel grade is cast.
Optionally, based on three-dimensional temperature field information acquired by the continuous casting billet in the arc zone and the straightening zone, respectively adjusting the water volumes of the middle nozzle loop and the side nozzle loop in the arc zone and the straightening zone until the temperature of the corner of the continuous casting billet in the straightening zone is greater than the brittleness temperature corresponding to the current casting steel, including:
according to the obtained target surface temperatures of the continuous casting billet in the two cooling control areas corresponding to the arc area and the straightening area, adjusting the water quantity of the arc area and the straightening area in the middle nozzle loop and the side nozzle loop;
when the simulation calculation shows that the temperature of the corner of the casting blank in the straightening area of the continuous casting blank is smaller than the brittleness temperature of the current casting steel, in the transverse direction of the continuous casting blank, limiting the deviation between the highest casting blank surface temperature in the control area of the edge nozzle loop and the casting blank center surface temperature to be smaller than a first preset temperature, and reducing the water quantity of the edge nozzle loop in the straightening area until the water quantity is minimum;
when the water quantity of the side nozzle loop in the straightening zone is reduced to the minimum water spraying quantity and the casting blank corner temperature of the continuous casting blank is still smaller than the brittleness temperature of the current casting steel, continuously adjusting the water quantity of the side nozzle loop of the two adjacent cooling control zones according to the limiting condition, and reducing the water quantity of the side nozzle loop in the straightening zone corresponding to the two adjacent cooling control zones; until the temperature of the casting blank corner part of the continuous casting blank in the straightening zone is higher than the brittleness temperature of the current casting steel.
Optionally, the deviation between the highest casting blank surface temperature of the edge nozzle loop control area in the arc area and the straightening area and the casting blank center surface temperature is smaller than a first preset temperature, and the first preset temperature is determined by the structure of the continuous casting machine, the current casting steel type and the position of the continuous casting blank; and the control areas of the middle nozzle loops in the arc-shaped area and the straightening area dynamically adjust the water quantity of the middle nozzle loops in the arc-shaped area and the straightening area by taking the target surface temperature of the continuous casting blank in each secondary cooling control area as a reference.
Optionally, the method further comprises:
and in a horizontal region of the continuous casting machine, taking the transverse surface temperature of the continuous casting billet as a target, dynamically controlling the water quantity of a secondary cooling nozzle loop in the horizontal region until the continuous casting billet forms a regular solidification morphology, wherein the maximum casting billet surface temperature drop in the secondary cooling nozzle loop control region of the horizontal region is smaller than a second preset temperature/m, and the second preset temperature is determined by the high-temperature characteristic of the currently cast steel.
Optionally, based on the three-dimensional temperature field information obtained by the continuous casting billet in the horizontal area, adjusting the water quantity of the secondary cooling nozzle loop in the horizontal area until the continuous casting billet forms a regular solidification morphology, including:
dynamically controlling the water quantity of a secondary cooling nozzle loop in a horizontal region by taking the temperature uniformity of the transverse surface of the continuous casting billet as a target on the basis of the acquired three-dimensional temperature field information of the continuous casting billet in the horizontal region;
controlling the water quantity of the two cold nozzle loops in the horizontal zone according to the basis of the fact that the maximum casting blank surface temperature drop is smaller than the second preset temperature/m in the current continuous casting blank pulling speed direction and the uniform surface temperature of the continuous casting blank is taken as a target according to the basis until the continuous casting blank is completely solidified; and after the continuous casting billet is completely solidified, taking the target surface temperature of the casting billet as a target in a secondary cooling control area, and controlling the water quantity of a loop nozzle until the outlet of the casting machine.
Optionally, the constructing a three-dimensional temperature field simulation model based on the finite element analysis method further includes:
collecting on-site production parameters including the section size of cast steel, steel composition, casting temperature, working pull rate, crystallizer water quantity and backwater temperature difference, and working parameters of a secondary cooling partition and a secondary cooling nozzle of a casting machine; and establishing a solidification heat transfer three-dimensional temperature field simulation model based on a finite element analysis method, and obtaining a three-dimensional temperature field in the casting blank continuous casting process by using the three-dimensional temperature field simulation model.
Optionally, the control period of the secondary cooling device for improving the quality of the continuous casting billet is less than 40 seconds.
Optionally, a plurality of secondary cooling control areas are arranged in the arc-shaped area and the straightening area, each secondary cooling control area is provided with a middle nozzle loop and an edge nozzle loop which can be independently controlled, and edge nozzles in the edge nozzle loops are asymmetric nozzles; the horizontal area is provided with a plurality of secondary cooling control areas, wherein the side nozzles in the side nozzle loop are asymmetric nozzles.
In addition, in order to achieve the above object, the present application also provides a secondary cooling device control system for improving the quality of a continuous casting slab, the system comprising:
the model construction module is used for constructing a three-dimensional temperature field simulation model based on a finite element analysis method;
the information acquisition module is used for acquiring three-dimensional temperature field information of the continuous casting blank in real time by utilizing the three-dimensional temperature field simulation model;
the first control module is used for respectively adjusting the water quantity of the middle nozzle loop and the side nozzle loop of the arc-shaped area and the straightening area based on the three-dimensional temperature field information respectively acquired by the continuous casting blank in the arc-shaped area and the straightening area until the temperature of the corner of the continuous casting blank in the straightening area is higher than the brittleness temperature corresponding to the current casting steel grade;
the second control module is used for adjusting the water quantity of the secondary cooling nozzle loop in the horizontal area based on the three-dimensional temperature field information obtained by the continuous casting billet in the horizontal area until the continuous casting billet forms a regular solidification morphology;
and the quality improvement module is used for dynamically implementing a soft reduction process according to the current casting steel grade and the process conditions so as to improve the quality of the continuous casting blank.
Furthermore, to achieve the above object, the present application provides a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method according to any one of the embodiments above when the computer program is executed.
Furthermore, to achieve the above object, the present application provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any of the embodiments above.
The control method, the system, the equipment and the medium for the secondary cooling device for improving the quality of the continuous casting billet are characterized in that the water quantity of the nozzles of the secondary cooling zone is respectively and dynamically controlled according to an arc zone, a straightening zone and a horizontal zone, and the water quantity of the middle nozzle loops and the side nozzle loops of the arc zone and the straightening zone are respectively adjusted until the temperature of the corners of a casting billet in the straightening zone is higher than the brittle temperature corresponding to the current casting steel; adjusting the water quantity of the secondary cooling nozzle loop in the horizontal area until the continuous casting billet forms a regular solidification morphology; through accurate control water spray, prevent that slab bight from supercooling in the straightening zone, avoid the slab to produce bight crackle this simultaneously, can also furthest form regular solidification appearance, obtain best soft reduction and push down metallurgical effect, show promotion casting blank surface and internal quality.
Additional advantages, objects, and features of the application will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the application. The objects and other advantages of the application may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
FIG. 1 is a schematic flow chart of a method for controlling a secondary cooling device for improving the quality of a continuous casting billet according to an embodiment of the present application;
FIG. 2 is a schematic view of a continuous casting machine in a method for controlling a secondary cooling device for improving quality of a continuous casting slab according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a secondary cooling nozzle circuit in an arc zone and a straightening zone in a secondary cooling apparatus control method for improving the quality of a continuous casting slab according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a two-cold nozzle circuit in a horizontal zone in a two-cold apparatus control method for improving quality of a continuous casting according to an embodiment of the present application;
FIG. 5 is a schematic diagram showing a structure of a secondary cooling device control system for improving quality of a continuous casting slab according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a computer device according to an embodiment of the application.
The achievement of the objects, functional features and advantages of the present application will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In one embodiment, a schematic flow chart of a method for controlling a secondary cooling device for improving quality of a continuous casting billet according to one embodiment of the present application is shown in fig. 1, and the method includes the following steps:
s101, constructing a three-dimensional temperature field simulation model based on a finite element analysis method;
the method comprises the steps of collecting on-site production parameters including the section size of cast steel, steel components, casting temperature, working pull speed, crystallizer water quantity and backwater temperature difference, and working parameters of a secondary cooling partition and a secondary cooling nozzle of a casting machine; and establishing a solidification heat transfer three-dimensional temperature field simulation model based on a finite element analysis method, and obtaining a three-dimensional temperature field in the casting blank continuous casting process by using the three-dimensional temperature field simulation model.
For example, a three-dimensional temperature field simulation model may also be constructed in the following manner;
acquiring temperature field simulation calculation parameter information of each process level of the continuous casting machine, wherein the temperature field simulation calculation parameter information comprises casting steel types and process parameters; dividing a simulation calculation area from the meniscus of the crystallizer to an outlet of the monitoring area to generate a plurality of slice units;
dividing the slicing units into a plurality of threads, and calculating a three-dimensional solidification heat transfer heat conduction differential equation of each slicing unit by using a multithreading technology to obtain a corresponding temperature field; the differential equation of solidification heat transfer and conduction of each slicing unit comprises heat transfer of a node in the thickness direction of a casting blank and heat transfer of a node in the width direction of the casting blank; the cooling boundary condition of each slicing unit comprises a cooling difference between the pulling speed direction and the transverse direction of the casting blank; and dynamically tracking each slicing unit according to the casting conditions of the continuous casting machine to obtain the temperature field information of the continuous casting machine.
It should be noted that, each thread determines its heat transfer boundary condition according to the current position of its corresponding slice unit, and based on the temperature field corresponding to the last moment, performs the solidification heat transfer numerical calculation on the discrete grid node of each slice unit by combining the duration and the space step size currently undergone by each slice unit, so as to obtain the corresponding temperature field of each slice unit at the current moment.
In this embodiment, since the slicing units are independent from each other and are associated with the previous calculation cycle information thereof; the threads are independent from each other, and the thread running modes are parallel, so that the simulation speed based on the three-dimensional temperature field of the continuous casting machine is greatly improved, and the efficiency of calculating the temperature field information is improved.
Step S102, acquiring three-dimensional temperature field information of a continuous casting blank in real time by utilizing the three-dimensional temperature field simulation model;
specifically, in the production process of the casting machine, the three-dimensional temperature field information of the casting blank is dynamically tracked in real time through an online three-dimensional temperature field simulation model; for example, three-dimensional temperature field information of the continuous casting machine in the form of cooling and the positions of a secondary cooling control area, a secondary cooling control area and a horizontal area corresponding to the arc area, the straightening area and the horizontal area is obtained according to the three-dimensional temperature field simulation model, wherein the three-dimensional temperature field information of the secondary cooling control area comprises deviation between the target surface temperature of a target control point and a preset temperature; and determining the brittleness temperature of the steel grade according to the high-temperature characteristic of the continuous casting blank when the steel grade is cast.
Three-dimensional temperature field information of the continuous casting billet can be obtained in real time by utilizing the three-dimensional temperature field simulation model, and follow-up control according to the three-dimensional temperature field information is facilitated.
For example, a three-dimensional solidification heat transfer simulation model of the continuous casting blank can be established through a computer, according to the influence of the surface cooling hydraulic power of the continuous casting blank and the three-dimensional heat transfer of the corner of the blank on the temperature of the continuous casting blank, the three-dimensional temperature field information of each part in the transverse direction and the longitudinal direction of the blank of the continuous casting blank which is actually produced is accurately simulated, and meanwhile, the actual condition of the blank in the cooling process is actually simulated through correction and boundary adjustment, for example, solidification heat transfer simulation software with corresponding functions is developed by adopting visual basic programming language.
The three-dimensional solidification heat transfer simulation model is utilized to preliminarily select the model and arrangement of the nozzles, calculate the temperature distribution of each part of the slab, adjust the model and arrangement of the nozzles in the middle of the wide surface of the slab with the aim of uniform surface temperature of the slab, and further determine the temperature distribution of the slab in the width specification, which is not described herein.
Step S103, respectively adjusting the water quantity of the middle nozzle loop and the side nozzle loop of the arc-shaped area and the straightening area based on the three-dimensional temperature field information respectively acquired by the continuous casting billet in the arc-shaped area and the straightening area until the temperature of the corner of the continuous casting billet in the straightening area is higher than the brittleness temperature corresponding to the current casting steel grade;
the water quantity of the arc-shaped area and the straightening area in the middle nozzle loop and the side nozzle loop is adjusted according to the obtained target surface temperatures of the two cold control areas corresponding to the arc-shaped area and the straightening area of the continuous casting billet;
when the simulation calculation shows that the temperature of the corner of the casting blank in the straightening area of the continuous casting blank is smaller than the brittleness temperature of the current casting steel, in the transverse direction of the continuous casting blank, limiting the deviation between the highest casting blank surface temperature in the control area of the edge nozzle loop and the casting blank center surface temperature to be smaller than a first preset temperature, and reducing the water quantity of the edge nozzle loop in the straightening area until the water quantity is minimum;
when the water quantity of the side nozzle loop in the straightening zone is reduced to the minimum water spraying quantity and the casting blank corner temperature of the continuous casting blank is still smaller than the brittleness temperature of the current casting steel, continuously adjusting the water quantity of the side nozzle loop of the two adjacent cooling control zones according to the limiting condition, and reducing the water quantity of the side nozzle loop in the straightening zone corresponding to the two adjacent cooling control zones; until the temperature of the casting blank corner part of the continuous casting blank in the straightening zone is higher than the brittleness temperature of the current casting steel.
The deviation between the highest casting blank surface temperature of the edge nozzle loop control area in the arc-shaped area and the straightening area and the casting blank center surface temperature is smaller than a first preset temperature, and the first preset temperature is determined by a continuous casting machine structure, the current casting steel type and the position of the continuous casting blank; and the control areas of the middle nozzle loops in the arc-shaped area and the straightening area dynamically adjust the water quantity of the middle nozzle loops in the arc-shaped area and the straightening area by taking the target surface temperature of the continuous casting blank in each secondary cooling control area as a reference.
Step S104, based on the three-dimensional temperature field information obtained by the continuous casting billet in the horizontal region, adjusting the water quantity of the secondary cooling nozzle loop in the horizontal region until the continuous casting billet forms a regular solidification morphology;
and in a horizontal region of the continuous casting machine, taking the transverse surface temperature of the continuous casting billet as a target, dynamically controlling the water quantity of a secondary cooling nozzle loop in the horizontal region until the continuous casting billet forms a regular solidification morphology, wherein the maximum casting billet surface temperature drop in the secondary cooling nozzle loop control region of the horizontal region is smaller than a second preset temperature/m, and the second preset temperature is determined by the high-temperature characteristic of the currently cast steel.
Optionally, based on the three-dimensional temperature field information obtained by the continuous casting billet in the horizontal area, adjusting the water quantity of the secondary cooling nozzle loop in the horizontal area until the continuous casting billet forms a regular solidification morphology, including:
dynamically controlling the water quantity of a secondary cooling nozzle loop in a horizontal region by taking the temperature uniformity of the transverse surface of the continuous casting billet as a target on the basis of the acquired three-dimensional temperature field information of the continuous casting billet in the horizontal region;
controlling the water quantity of the two cold nozzle loops in the horizontal zone according to the basis of the fact that the maximum casting blank surface temperature drop is smaller than the second preset temperature/m in the current continuous casting blank pulling speed direction and the uniform surface temperature of the continuous casting blank is taken as a target according to the basis until the continuous casting blank is completely solidified; and after the continuous casting billet is completely solidified, taking the target surface temperature of the casting billet as a target in a secondary cooling control area, and controlling the water quantity of a loop nozzle until the outlet of the casting machine.
For example, a plurality of secondary cooling control areas are arranged in the arc-shaped area and the straightening area, each secondary cooling control area is provided with a middle nozzle loop and an edge nozzle loop which can be independently controlled, and edge nozzles in the edge nozzle loops are asymmetric nozzles; the horizontal area is provided with a plurality of secondary cooling control areas, wherein the side nozzles in the side nozzle loop are asymmetric nozzles. Referring to fig. 3, a schematic diagram of a secondary cooling nozzle loop in an arc zone and a straightening zone in a secondary cooling device control method for improving quality of a continuous casting billet according to an embodiment of the present application is shown; referring to fig. 4, a schematic diagram of a two-cold nozzle loop in a horizontal zone in a two-cold apparatus control method for improving quality of a continuous casting according to an embodiment of the application is shown; according to the graph, on one hand, the middle nozzle loop and the side nozzle loop can be independently controlled to achieve the purpose of accurately controlling the water spraying amount of the nozzles, and on the other hand, the asymmetric side nozzle can be independently controlled to facilitate controlling the water spraying amount of the continuous casting billet in the transverse direction.
Step S105, dynamically implementing a soft reduction process according to the current casting steel grade and process conditions to improve the quality of the continuous casting billet.
Specifically, the dynamic soft reduction is used as an effective means for improving the central porosity and the central segregation of a casting blank, and the basic principle is as follows: the solidification shrinkage of the casting blank can be compensated by applying proper reduction near the solidification end position of the continuous casting blank, so that a gap or clearance formed by the solidification shrinkage of the casting blank is reduced or even eliminated, and molten steel containing high-concentration solute elements is prevented from flowing to the center of the casting blank, so that the distribution area of the solute elements is enlarged, and the center segregation is improved; meanwhile, as the casting blank center molten steel enriched with solute elements flows towards the pulling speed direction through extrusion of the solidification tail end of the casting blank, the function of redistributing the solute elements is achieved, and the purposes of improving or eliminating center segregation and center porosity are achieved.
The dynamic soft reduction is to determine reasonable reduction position (reduction interval) and reduction according to the actual solidification condition of the casting flow. The reduction interval is used as a key technological parameter of dynamic soft reduction, and directly influences the improvement effect of the casting blank quality. If the position of the pressing section is at the front, defects such as internal cracks are easy to generate; if the pressing section is at the rear, the effect of improving center segregation and center porosity is reduced. Furthermore, the determination of the dynamic soft reduction process reduction interval becomes a key factor influencing the central segregation and central porosity improvement effects of the casting blank.
For example, whether the casting position is in the rolling section is determined according to the equivalent solid phase rate of the two-phase region and the initial solid phase rate and the end solid phase rate corresponding to the steel grade rolling section, and finally the real-time rolling section is determined.
In the embodiment, by controlling the nozzle water quantity of the secondary cooling device in the transverse direction and the blank drawing direction of the continuous casting blank in the mode, the accurate control of the nozzle water quantity is realized, and the water quantity of the nozzle loops in the middle and side parts of the arc-shaped area and the straightening area is regulated until the temperature of the corners of the continuous casting blank in the straightening area is higher than the brittle temperature corresponding to the current casting steel type; adjusting the water quantity of the secondary cooling nozzle loop in the horizontal area until the continuous casting billet forms a regular solidification morphology; through accurately controlling the water spraying amount, the corner of the slab is prevented from being supercooled in the straightening area, corner cracks of the slab are prevented from being generated, meanwhile, the regular solidification morphology can be formed to the maximum extent, the optimal soft reduction metallurgy effect is obtained, and the surface and internal quality of a casting blank are obviously improved; the control method of the application is used for setting the soft reduction rate, and the method for determining the soft reduction zone under the condition of non-uniform growth of the solidified shell of the wide-thick plate continuous casting billet ensures the implementation effect of the soft reduction process, can obviously reduce the segregation and the loosening defects of the cross section center line of the wide-thick plate continuous casting billet, and has good application prospect.
In another embodiment, a steel plant adopts a straight arc continuous casting machine to produce casting blanks with the cross section of 250mm multiplied by 1870mm, the production steel grade is X, the steel belongs to medium carbon steel, the working drawing speed is 1.0m/min, and the casting temperature is 1539 ℃. Wherein the parameters of the secondary cooling zone are as follows:
it should be noted that, with reference to fig. 2, a schematic structural diagram of a continuous casting machine in a method for controlling a secondary cooling device for improving quality of a continuous casting billet according to an embodiment of the present application is provided, wherein a zero section is a vertical bending section, 1-6 sections are arc-shaped sections, 7-8 sections are straightening sections, and 9-14 sections are horizontal sections.
The target surface temperature and the allowable temperature deviation of target control points of each secondary cooling zone of the steel grade are shown in the following table:
the brittle temperature range is 680-850 ℃ according to the high temperature characteristic of the steel grade.
According to the soft reduction rolling process, the rolling starting point of the steel grade is the casting blank center solid phase rate of 0.4, and the rolling ending point is the casting blank center solid phase rate of 0.9.
Respectively and dynamically controlling the water quantity of the middle and side loops in the arc-shaped area and the straightening area on line based on the simulation result of the online three-dimensional temperature field of the continuous casting slab in the arc-shaped area and the straightening area until the temperature of the corner of the casting blank in the straightening area is higher than the brittleness temperature of the cast steel;
specifically, the three-dimensional temperature field model dynamically tracks the change of a casting blank temperature field on line; in the arc-shaped area and the straightening area, the middle nozzle loop and the side nozzle loop start to take the target surface temperature of the casting blank at the outlet of each secondary cooling control area as a target, and the water quantity of the middle nozzle loop and the side nozzle loop in the arc-shaped area and the straightening area is dynamically controlled on line; on the premise of the current casting working condition, obtaining the temperature of the lowest corner of the casting blank in the casting blank straightening area to be 730 ℃ through online calculation of a model; because the temperature range is lower than the brittleness temperature range of the steel grade, limiting conditions that the deviation between the highest casting blank surface temperature in the control area of the side nozzle loop and the casting blank center surface temperature needs to be lower than 120 ℃ in the transverse direction of the casting blank, and reducing the nozzle water quantity of the side W loop (shown in figure 3) in the straightening area until 30L/min, wherein the deviation between the highest casting blank surface temperature in the transverse direction of the casting blank and the casting blank center surface temperature reaches 120 ℃, but the lowest casting blank corner temperature in the straightening area is 800 ℃; therefore, the water quantity of the side loop nozzles in the two adjacent cooling areas in front of the straightening area needs to be continuously adjusted, and the limiting condition that the deviation between the highest casting blank surface temperature in the side loop control area of the side nozzle and the casting blank center surface temperature needs to be smaller than 120 ℃ is adopted, when the water quantity of the side loop nozzles in the two cooling areas is reduced until 15L/min, the lowest temperature of the casting blank corner in the straightening area is 855 ℃, at the moment, the deviation between the highest casting blank surface temperature in the transverse direction of the casting blank in the two cooling areas and the casting blank center surface temperature is 100 ℃, and the step of adjustment is completed in the control period.
In the horizontal area, on the basis of the simulation result of the online three-dimensional temperature field of the continuous casting slab, controlling the water quantity of the loop in the horizontal area dynamically on line until the casting blank forms a regular solidification morphology;
specifically, the three-dimensional temperature field model dynamically tracks the change of a casting blank temperature field on line; on the premise of the current casting working condition, obtaining the maximum temperature difference of the transverse surfaces of the casting blank in the two adjacent cold areas after the straightening area through online calculation of a model, wherein the maximum temperature difference is 130 ℃; in the casting blank drawing speed direction, limiting the maximum temperature drop of the casting blank surface to be less than 150 ℃/m, and when the water quantity of a control loop nozzle in the secondary cooling zone (shown in figure 4) is regulated and controlled to be 138L/min, the maximum temperature difference of the casting blank transverse surface in the secondary cooling zone is 50 ℃, but in the casting blank drawing speed direction, the maximum temperature drop of the casting blank surface in the secondary cooling zone reaches 150 ℃/m; therefore, the water quantity of the control loop nozzle in the next adjacent two cold areas needs to be continuously adjusted, and then the maximum temperature drop of the surface of the casting blank is limited to be less than 150 ℃/m, when the water quantity of the control loop nozzle in the two cold areas is adjusted and controlled to be 88L/min, the maximum temperature difference of the transverse surface of the casting blank in the two cold areas is 10 ℃, the casting blank forms a regular three-dimensional solidification morphology, the difference between the first solidifying point and the last solidifying point is only 0.05m in the casting blank pulling speed direction, and meanwhile, the maximum temperature drop of the surface of the casting blank in the two cold areas is 70 ℃/m in the casting blank pulling speed direction; in the secondary cooling control area, the casting blank is completely solidified; the adjustment of this step is completed in the control period.
According to the current casting steel type and process conditions, a soft reduction process is dynamically implemented to improve the quality of the continuous casting billet.
Specifically, by sampling, pickling and grinding, edge cracks and macroscopic detection analysis are carried out on a casting blank, and compared with a casting blank sample of the method which is not adopted, the surface and internal quality of the casting blank adopting the method are obviously improved. For example, under the condition that other working conditions are not changed, the comparison of the statistical data of the grade of the casting blank corner cracks and center segregation shows that the incidence rate of the casting blank corner cracks is reduced by 78.8% after the method is not adopted for the first 6 months and after the method is adopted for the 6 months; the percent of pass of the center segregation grade of the casting blank is improved from 87.4 percent to 99.6 percent.
In another embodiment, the control period of the secondary cooling device for improving the quality of the continuous casting billet is less than 40 seconds, the whole control period is shorter, the continuous casting billet is convenient to control in real time, and the quality of the continuous casting billet can be effectively improved.
The embodiment provides a control method of a secondary cooling device for improving the quality of continuous casting billets, which comprises the steps of respectively adjusting the water volumes of a middle nozzle loop and an edge nozzle loop of an arc zone, a straightening zone and a horizontal zone according to the water volumes of the nozzles of the dynamic secondary cooling control zone respectively until the temperature of the corners of the continuous casting billets in the straightening zone is higher than the brittle temperature corresponding to the current casting steel grade; adjusting the water quantity of the secondary cooling nozzle loop in the horizontal area until the continuous casting billet forms a regular solidification morphology; through accurate control water spray, prevent that slab bight from supercooling in the straightening zone, avoid the slab to produce bight crackle this simultaneously, can also furthest form regular solidification appearance, obtain best soft reduction and push down metallurgical effect, show promotion casting blank surface and internal quality.
In one embodiment, the present application also provides a secondary cooling device control system 500 for improving the quality of a continuous casting slab, see fig. 5, comprising:
the model construction module 501 is used for constructing a three-dimensional temperature field simulation model based on a finite element analysis method;
the information acquisition module 502 is used for acquiring three-dimensional temperature field information of the continuous casting blank in real time by utilizing the three-dimensional temperature field simulation model;
a first control module 503, configured to adjust the water volumes of the middle nozzle loop and the side nozzle loop of the arc-shaped region and the straightening region respectively based on the three-dimensional temperature field information acquired by the continuous casting billet in the arc-shaped region and the straightening region respectively, until the temperature of the corner of the continuous casting billet in the straightening region is greater than the brittle temperature corresponding to the current cast steel grade;
a second control module 504, configured to adjust the amount of water in the secondary cooling nozzle loop in the horizontal area based on the three-dimensional temperature field information obtained by the continuous casting billet in the horizontal area, until the continuous casting billet forms a regular solidification morphology;
a quality improvement module 505 for dynamically implementing a soft reduction process to improve the quality of the continuous casting slab according to the current cast steel grade and process conditions.
It should be understood that the above-mentioned two-cold-device control system for improving the quality of continuous casting billets is essentially provided with a plurality of modules for executing the two-cold-device control method for improving the quality of continuous casting billets in any of the above embodiments, and specific functions and technical effects thereof will be described with reference to the above embodiments and will not be repeated herein.
In an embodiment, referring to fig. 6, the present embodiment further provides a computer device 600, comprising a memory 601, a processor 602 and a computer program stored on the memory and executable on the processor, said processor 602 implementing the steps of the method according to any of the embodiments above when said computer program is executed.
In an embodiment, there is also provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of any of the embodiments above.
The embodiment of the application can acquire and process the related data based on the artificial intelligence technology. Among these, artificial intelligence (Artificial Intelligence, AI) is the theory, method, technique and application system that uses a digital computer or a digital computer-controlled machine to simulate, extend and extend human intelligence, sense the environment, acquire knowledge and use knowledge to obtain optimal results.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, apparatus, article, or method. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, apparatus, article or method that comprises the element.
The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments. From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present application.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the application, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (9)
1. A secondary cooling device control method for improving the quality of a continuous casting billet, the method comprising:
constructing a three-dimensional temperature field simulation model based on a finite element analysis method;
acquiring three-dimensional temperature field information of the continuous casting blank in real time by utilizing the three-dimensional temperature field simulation model;
based on three-dimensional temperature field information respectively acquired by the continuous casting billet in an arc-shaped area and a straightening area, respectively adjusting the water quantity of a middle nozzle loop and a side nozzle loop of the arc-shaped area and the straightening area until the temperature of the corner of a casting billet in the straightening area is higher than the brittleness temperature corresponding to the current casting steel grade;
according to the obtained target surface temperatures of the continuous casting billet in the two cooling control areas corresponding to the arc-shaped area and the straightening area, adjusting the water quantity of the arc-shaped area and the straightening area in the middle nozzle loop and the side nozzle loop; when the simulation calculation shows that the temperature of the corner of the casting blank in the straightening area of the continuous casting blank is smaller than the brittleness temperature of the current casting steel, in the transverse direction of the continuous casting blank, limiting the deviation between the highest casting blank surface temperature in the control area of the edge nozzle loop and the casting blank center surface temperature to be smaller than a first preset temperature, and reducing the water quantity of the edge nozzle loop in the straightening area until the water quantity is minimum; when the water quantity of the side nozzle loop in the straightening zone is reduced to the minimum water spraying quantity and the casting blank corner temperature of the continuous casting blank is still smaller than the brittleness temperature of the current casting steel, continuously adjusting the water quantity of the side nozzle loop of the two adjacent cooling control zones according to the limiting condition, and reducing the water quantity of the side nozzle loop in the straightening zone corresponding to the two adjacent cooling control zones; until the temperature of the casting blank corner of the continuous casting blank in the straightening area is higher than the brittleness temperature of the current casting steel grade;
based on three-dimensional temperature field information obtained by the continuous casting billet in a horizontal area, regulating the water quantity of a secondary cooling nozzle loop in the horizontal area until the continuous casting billet forms a regular solidification morphology;
according to the current casting steel type and process conditions, a soft reduction process is dynamically implemented to improve the quality of the continuous casting billet.
2. The method for controlling a secondary cooling device for improving the quality of a continuous casting billet according to claim 1, wherein the step of acquiring three-dimensional temperature field information of the continuous casting billet in real time by using the three-dimensional temperature field simulation model comprises the steps of:
acquiring three-dimensional temperature field information of the continuous casting machine in the form of two-cooling control areas, two-cooling control area positions and cooling corresponding to the arc-shaped area, the straightening area and the horizontal area respectively according to the three-dimensional temperature field simulation model, wherein the three-dimensional temperature field information of the two-cooling control area comprises target surface temperature of a target control point and preset temperature deviation; and determining the brittleness temperature of the steel grade according to the high-temperature characteristic of the continuous casting blank when the steel grade is cast.
3. The method for controlling a secondary cooling device for improving the quality of a continuous casting billet according to claim 2, wherein the deviation between the highest casting billet surface temperature of the edge nozzle loop control area in the arc area and the straightening area and the casting billet center surface temperature is smaller than a first preset temperature, and the first preset temperature is determined by the structure of the continuous casting machine, the current casting steel type and the position of the continuous casting billet; and the control areas of the middle nozzle loops in the arc-shaped area and the straightening area dynamically adjust the water quantity of the middle nozzle loops in the arc-shaped area and the straightening area by taking the target surface temperature of the continuous casting blank in each secondary cooling control area as a reference.
4. The method for controlling a secondary cooling device for improving the quality of a continuous casting slab according to claim 1, further comprising:
and in a horizontal region of the continuous casting machine, taking the transverse surface temperature of the continuous casting billet as a target, dynamically controlling the water quantity of a secondary cooling nozzle loop in the horizontal region until the continuous casting billet forms a regular solidification morphology, wherein the maximum casting billet surface temperature drop in the secondary cooling nozzle loop control region of the horizontal region is smaller than a second preset temperature/m, and the second preset temperature is determined by the high-temperature characteristic of the currently cast steel.
5. The method for controlling a secondary cooling device for improving the quality of a continuous casting billet according to claim 1, wherein the step of adjusting the amount of water in a secondary cooling nozzle circuit in a horizontal zone based on three-dimensional temperature field information obtained by the continuous casting billet in the horizontal zone until the continuous casting billet forms a regular solidification morphology comprises:
dynamically controlling the water quantity of a secondary cooling nozzle loop in a horizontal region by taking the temperature uniformity of the transverse surface of the continuous casting billet as a target on the basis of the acquired three-dimensional temperature field information of the continuous casting billet in the horizontal region;
controlling the water quantity of the two cold nozzle loops in the horizontal zone according to the basis of the fact that the maximum casting blank surface temperature drop is smaller than the second preset temperature/m in the current continuous casting blank pulling speed direction and the uniform surface temperature of the continuous casting blank is taken as a target according to the basis until the continuous casting blank is completely solidified; and after the continuous casting billet is completely solidified, taking the target surface temperature of the casting billet as a target in a secondary cooling control area, and controlling the water quantity of a loop nozzle until the outlet of the casting machine.
6. The method for controlling a secondary cooling device for improving the quality of a continuous casting billet according to claim 1, wherein the constructing a three-dimensional temperature field simulation model based on a finite element analysis method further comprises:
collecting on-site production parameters including the section size of cast steel, steel composition, casting temperature, working pull rate, crystallizer water quantity and backwater temperature difference, and working parameters of a secondary cooling partition and a secondary cooling nozzle of a casting machine; and establishing a solidification heat transfer three-dimensional temperature field simulation model based on a finite element analysis method, and obtaining a three-dimensional temperature field in the casting blank continuous casting process by using the three-dimensional temperature field simulation model.
7. A secondary cooling device control system for improving the quality of a continuous casting slab, the system comprising:
the model construction module is used for constructing a three-dimensional temperature field simulation model based on a finite element analysis method;
the information acquisition module is used for acquiring three-dimensional temperature field information of the continuous casting blank in real time by utilizing the three-dimensional temperature field simulation model;
the first control module is used for respectively adjusting the water quantity of the middle nozzle loop and the side nozzle loop of the arc-shaped area and the straightening area based on the three-dimensional temperature field information respectively acquired by the continuous casting blank in the arc-shaped area and the straightening area until the temperature of the corner of the continuous casting blank in the straightening area is higher than the brittleness temperature corresponding to the current casting steel grade; according to the obtained target surface temperatures of the continuous casting billet in the two cooling control areas corresponding to the arc-shaped area and the straightening area, adjusting the water quantity of the arc-shaped area and the straightening area in the middle nozzle loop and the side nozzle loop; when the simulation calculation shows that the temperature of the corner of the casting blank in the straightening area of the continuous casting blank is smaller than the brittleness temperature of the current casting steel, in the transverse direction of the continuous casting blank, limiting the deviation between the highest casting blank surface temperature in the control area of the edge nozzle loop and the casting blank center surface temperature to be smaller than a first preset temperature, and reducing the water quantity of the edge nozzle loop in the straightening area until the water quantity is minimum; when the water quantity of the side nozzle loop in the straightening zone is reduced to the minimum water spraying quantity and the casting blank corner temperature of the continuous casting blank is still smaller than the brittleness temperature of the current casting steel, continuously adjusting the water quantity of the side nozzle loop of the two adjacent cooling control zones according to the limiting condition, and reducing the water quantity of the side nozzle loop in the straightening zone corresponding to the two adjacent cooling control zones; until the temperature of the casting blank corner of the continuous casting blank in the straightening area is higher than the brittleness temperature of the current casting steel grade;
the second control module is used for adjusting the water quantity of the secondary cooling nozzle loop in the horizontal area based on the three-dimensional temperature field information obtained by the continuous casting billet in the horizontal area until the continuous casting billet forms a regular solidification morphology;
and the quality improvement module is used for dynamically implementing a soft reduction process according to the current casting steel grade and the process conditions so as to improve the quality of the continuous casting blank.
8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any one of claims 1 to 6 when the computer program is executed.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
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