CN117454054B - Method and system for judging occurrence of meniscus slag coiling of crystallizer in continuous casting process - Google Patents
Method and system for judging occurrence of meniscus slag coiling of crystallizer in continuous casting process Download PDFInfo
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Abstract
The invention discloses a method and a system for judging occurrence of meniscus slag coiling of a crystallizer in a continuous casting process, and relates to the technical field of metallurgical continuous casting. The judging method comprises the following steps: obtaining structural parameters of a continuous casting crystallizer and a water gap, casting process parameters, physical parameters of molten steel and slag phases and turbulence characteristic quantity of the molten steel under the current process conditions; respectively calculating a first influence factor, a second influence factor and a third influence factor according to the obtained parameters, combining the influence factors and performing dimensionless treatment to obtain a meniscus dimensionless slag inclusion index; determining a critical minimum dimensionless slag inclusion index based on the molten steel and slag phase physical parameters; and determining whether the meniscus is curled and the position of the curled slag according to the meniscus non-dimensional curled slag index and the critical minimum non-dimensional curled slag index. The invention can quantitatively judge whether the meniscus is curled and the position of the curled slag under the current process condition.
Description
Technical Field
The invention relates to the technical field of metallurgical continuous casting, in particular to a method and a system for judging occurrence of meniscus slag of a crystallizer in the continuous casting process.
Background
Slag generation at the meniscus of a crystallizer in the continuous casting process is one of main sources of large-size inclusions in a continuous casting billet, and the occurrence of the slag generation has a direct influence on the surface quality of the continuous casting billet. The slag-rolling phenomenon is a complex physicochemical process, and relates to the physical properties of the composition, temperature, viscosity, interfacial tension and the like of the covering slag, and is also influenced by the composition, temperature and flow mode of molten steel. The main ways of winding the mold flux include: (1) After impacting the narrow surface, the flow moves upwards along the narrow surface to push the casting powder to move near the water gap, and the casting powder is involved in molten steel, namely, the casting powder is caused by meniscus impact; (2) The unsteady state and the asymmetric flow field in the crystallizer cause vortex to be generated near the water gap so as to roll the covering slag inclusion into molten steel, which is called as karman vortex to cause slag rolling; (3) The negative pressure area formed by the outlet of the water gap sucks liquid protective slag along the outer wall of the water gap, which is called as slag rolling caused by pressure difference on two sides of the water gap; (4) The blown bubbles can be broken at the interface of the steel slag to form foam slag which is involved in the molten steel, namely the bubbles float upwards to cause slag rolling; (5) Unsteady slag entrainment caused by unsteady flow at the surface of the crystallizer molten steel is referred to as unsteady turbulence induced slag entrainment.
Regarding the slag rolling of the meniscus of the crystallizer, the influence of different process parameters on the slag rolling probability is mainly researched by theoretical deduction, physical simulation and numerical simulation at present, and some researches propose characteristic variables to directly or indirectly evaluate the slag rolling probability, such as F number, capillary number, surface fluctuation, meniscus flow velocity and the like. These characteristic variables can be verified within a certain range, but are not suitable for a wider range of continuous casting process conditions, and are difficult to integrate with important factors including crystallizer size, process parameters, molten steel and slag phase properties, and the like. Therefore, a new judging condition is provided to quantitatively judge whether the crystallizer slag is generated or not, and the method has important significance for controlling and improving the surface quality of the continuous casting billet.
Disclosure of Invention
The invention aims to provide a judging method and a judging system for occurrence of slag inclusion at a crystallizer meniscus in a continuous casting process, which can quantitatively judge whether slag inclusion occurs at the meniscus and the occurrence position of slag inclusion under the current process condition by comparing the non-dimensional slag inclusion index at different positions of the crystallizer meniscus in the actual continuous casting process with the critical minimum non-dimensional slag inclusion index.
In order to achieve the above object, the present invention provides the following solutions:
a judging method for occurrence of meniscus slag in a crystallizer in a continuous casting process comprises the following steps:
obtaining structural parameters of a continuous casting crystallizer and a water gap, casting process parameters, physical parameters of molten steel and slag phases and turbulence characteristic quantity of the molten steel under the current process conditions;
determining the influence factors of the continuous casting crystallizer and water gap structural parameters and the casting process parameters on the slag inclusion index to obtain a first influence factor;
determining an influence factor of the physical parameters of the molten steel and the slag phase on the slag reeling index to obtain a second influence factor;
determining an influence factor of the molten steel turbulence characteristic quantity on the slag reeling index to obtain a third influence factor;
combining the first influence factor, the second influence factor and the third influence factor and performing dimensionality to obtain a meniscus dimensionless slag inclusion index;
determining a critical minimum dimensionless slag inclusion index based on the molten steel and slag phase physical parameters;
and determining whether slag rolling occurs on the meniscus and the position where the slag rolling occurs according to the meniscus non-dimensional slag rolling index and the critical minimum non-dimensional slag rolling index.
Optionally, the calculation formula of the first influence factor is:
wherein Zc geo Is the influencing factor of continuous casting crystallizer and water gap structural parameter and casting technological parameter to slag index, v pull For drawing speed D SEN Is the inner diameter of the water gap L mold And W is mold Respectively the length and the width of the crystallizer, beta is the outlet angle of a water gap, H id Is the immersion depth of the water gap.
Optionally, the calculation formula of the second influence factor is:
wherein Zc pro Is the influence factor of the physical parameters of molten steel and slag phase on the slag coiling index, ρ slag Is the slag density, mu slag Viscosity of slag, ρ steel Is the density of molten steel, mu steel Is the viscosity of molten steel, sigma is the surface tension of steel-slag, h slag Is the thickness of the slag layer.
Optionally, the calculation formula of the third influence factor is:
wherein Zc tur Is the influence factor of the turbulence characteristic quantity of molten steel on slag rolling index, omega z For the vorticity in the z direction, u z ' is the z-direction pulse rate.
Optionally, the meniscus non-dimensional slag inclusion index has the expression:
Zc＝(Zc ge o)0.5Zc pr o(Zc tur )2
wherein Zc is a dimensionless slag inclusion index, zc geo Is the influencing factor of continuous casting crystallizer and water gap structural parameter and casting process parameter to slag inclusion index, zc pro Zc is the influencing factor of the physical parameters of molten steel and slag phase to the slag coiling index tur Is the influence factor of the turbulence characteristic quantity of the molten steel on the slag rolling index.
Optionally, the determining the critical minimum dimensionless slag inclusion index based on the molten steel and slag phase physical parameters specifically includes:
determining a molten steel and slag phase system according to the molten steel and slag phase physical parameters;
and determining a critical minimum dimensionless slag inclusion index of slag inclusion under the molten steel and slag phase system through numerical simulation calculation of multiphase flow of coupling molten steel and slag phase.
Optionally, the determining whether the meniscus generates the slag and the position where the slag occurs according to the meniscus non-dimensional slag index and the critical minimum non-dimensional slag index specifically includes:
according to the non-dimensional slag rolling index of the meniscus, determining the distribution condition of the non-dimensional slag rolling number on the whole meniscus of the crystallizer under the current process condition;
and comparing the maximum dimensionless slag inclusion index on the meniscus with the critical minimum dimensionless slag inclusion index based on the distribution condition, and determining whether slag inclusion occurs on the meniscus and the position where the slag inclusion occurs.
The invention also provides a judging system for the occurrence of meniscus slag coiling of the crystallizer in the continuous casting process, which comprises the following steps:
the parameter acquisition module is used for acquiring structural parameters of the continuous casting crystallizer and the water gap, casting process parameters, molten steel and slag phase physical parameters and molten steel turbulence characteristic quantity under the current process conditions;
the first influence factor determining module is used for determining influence factors of the continuous casting crystallizer and water gap structural parameters and the casting process parameters on the slag inclusion index to obtain a first influence factor;
the second influence factor determining module is used for determining the influence factors of the physical parameters of the molten steel and the slag phase on the slag reeling index to obtain second influence factors;
the third influence factor determining module is used for determining the influence factor of the molten steel turbulence characteristic quantity on the slag reeling index to obtain a third influence factor;
the meniscus non-dimensional slag inclusion index calculation module is used for combining the first influence factor, the second influence factor and the third influence factor and performing non-dimensionalization to obtain a meniscus non-dimensional slag inclusion index;
the critical minimum dimensionless slag inclusion index calculation module is used for determining a critical minimum dimensionless slag inclusion index based on the physical parameters of the molten steel and the slag phase;
and the comparison and judgment module is used for determining whether the meniscus is curled and the position where the curled slag occurs according to the meniscus non-dimensional curled slag index and the critical minimum non-dimensional curled slag index.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a method and a system for judging the occurrence of meniscus slag coiling of a crystallizer in a continuous casting process, wherein the method comprises the steps of obtaining structural parameters of the continuous casting crystallizer and a water gap, casting process parameters, physical parameters of molten steel and slag phases and turbulent flow characteristic quantity of the molten steel under the current process conditions; respectively calculating a first influence factor, a second influence factor and a third influence factor according to the obtained parameters, combining the influence factors and performing dimensionless treatment to obtain a meniscus dimensionless slag inclusion index; determining a critical minimum dimensionless slag inclusion index based on the molten steel and slag phase physical parameters; and determining whether the meniscus is curled and the position of the curled slag according to the meniscus non-dimensional curled slag index and the critical minimum non-dimensional curled slag index. The invention can quantitatively judge whether the meniscus is curled and the position of the curled slag under the current process condition.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for determining occurrence of meniscus slag from a mold in a continuous casting process according to the present invention;
FIG. 2 is a schematic view of the parameters in the present embodiment;
FIG. 3 is a schematic diagram of the critical minimum dimensionless slag number calculated by the multiphase flow of the coupling molten steel and slag phases in this example;
fig. 4 is a schematic diagram showing the meniscus slag curl position determined in this example.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a judging method and a judging system for occurrence of slag inclusion at a crystallizer meniscus in a continuous casting process, which can quantitatively judge whether slag inclusion occurs at the meniscus and the occurrence position of slag inclusion under the current process condition by comparing the non-dimensional slag inclusion index at different positions of the crystallizer meniscus in the actual continuous casting process with the critical minimum non-dimensional slag inclusion index.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, the invention provides a method for determining occurrence of meniscus slag in a crystallizer in a continuous casting process, which comprises the following steps:
step 100: obtaining structural parameters of a continuous casting crystallizer and a water gap, casting process parameters, physical parameters of molten steel and slag phases and turbulence characteristic quantity of the molten steel under the current process conditions;
step 200: determining the influence factors of the continuous casting crystallizer and water gap structural parameters and the casting process parameters on the slag inclusion index to obtain a first influence factor; the calculation formula of the first influence factor is as follows:
wherein Zc geo Is the influencing factor of continuous casting crystallizer and water gap structural parameter and casting technological parameter to slag index, v pull For drawing speed D SEN Is the inner diameter of the water gap L mold And W is mold Respectively the length and the width of the crystallizer, beta is the outlet angle of a water gap, H id Is the immersion depth of the water gap.
Step 300: determining an influence factor of the physical parameters of the molten steel and the slag phase on the slag reeling index to obtain a second influence factor; the calculation formula of the second influence factor is as follows:
wherein Zc pro Is the influence factor of the physical parameters of molten steel and slag phase on the slag coiling index, ρ slag Is the slag density, mu slag Viscosity of slag, ρ steel Is the density of molten steel, mu steel Is the viscosity of molten steel, sigma is the surface tension of steel-slag, h slag Is the thickness of the slag layer.
Step 400: determining an influence factor of the molten steel turbulence characteristic quantity on the slag reeling index to obtain a third influence factor; the calculation formula of the third influence factor is as follows:
wherein Zc tur Is the influence factor of the turbulence characteristic quantity of molten steel on slag rolling index, omega z For the vorticity in the z direction, u z ' is the z-direction pulse rate.
Step 500: combining the first influence factor, the second influence factor and the third influence factor and performing dimensionality to obtain a meniscus dimensionless slag inclusion index; the expression of the meniscus dimensionless slag inclusion index is:
Zc＝(Zc ge o)0.5Zc pr o(Zc tur )2
wherein Zc is a dimensionless slag inclusion index, zc geo Is the influencing factor of continuous casting crystallizer and water gap structural parameter and casting process parameter to slag inclusion index, zc pro Zc is the influencing factor of the physical parameters of molten steel and slag phase to the slag coiling index tur Is the influence factor of the turbulence characteristic quantity of the molten steel on the slag rolling index.
Step 600: determining a critical minimum dimensionless slag inclusion index based on the molten steel and slag phase physical parameters; the method specifically comprises the following steps:
determining a molten steel and slag phase system according to the molten steel and slag phase physical parameters; and determining a critical minimum dimensionless slag inclusion index of slag inclusion under the molten steel and slag phase system through numerical simulation calculation of multiphase flow of coupling molten steel and slag phase. That is, the physical parameters of the molten steel and the slag phase determine the difficulty of slag entrainment, and for a given molten steel and slag phase system, the critical minimum dimensionless slag entrainment index of slag entrainment under the current system of the physical parameters of the molten steel and the slag phase is determined through the numerical simulation calculation of the multiphase flow of the coupled molten steel and the slag phase.
Step 700: determining whether slag rolling occurs on the meniscus and the position where the slag rolling occurs according to the meniscus non-dimensional slag rolling index and the critical minimum non-dimensional slag rolling index; the method specifically comprises the following steps:
for given continuous casting crystallizer and water gap structural parameters, casting process parameters, molten steel and slag phase physical parameters, through the steps, the size distribution of the dimensionless slag number on the whole meniscus under the current condition can be calculated, the maximum dimensionless slag index in the meniscus and the critical minimum dimensionless slag index of slag generation are further compared, and whether slag generation occurs in the meniscus and the position of slag generation are judged.
On the basis of the technical scheme, the following embodiments are provided.
As shown in FIG. 2, the size of the continuous casting mold for this example was 1000mm×230mm, the inner diameter of the nozzle was 78mm, the immersion depth of the nozzle was 150mm, the outlet angle of the nozzle was 15℃and the pulling rate was 1.8m/min. The physical properties of the molten steel and slag phase are shown in Table 1. And obtaining the structural parameters of the continuous casting crystallizer and the water gap and the influence factor of casting process parameters on the slag inclusion index according to the corresponding formula, wherein the influence factor is 5.085. And obtaining the influence factor of the physical parameters of the molten steel and the slag phase on the slag reeling index to be 0.543 according to the corresponding formula. Further obtaining a calculation formula of the meniscus dimensionless slag inclusion index through a corresponding formulaVorticity omega in z direction z And a z-direction pulse velocity u z ' can be obtained by numerical simulation. Further, by numerical simulation calculation of multiphase flow of the coupling molten steel and the slag phase, the critical minimum dimensionless slag inclusion index of slag inclusion occurrence under the molten steel and slag phase system of the embodiment shown in fig. 3 is 1.49. Further, by comparing the maximum dimensionless slag inclusion index in the meniscus with the critical minimum dimensionless slag inclusion index of the occurrence of slag inclusion, it is found that the meniscus position dimensionless slag inclusion index exceeds the critical minimum dimensionless slag inclusion index of the occurrence of slag inclusion by 1.49 as shown in fig. 4, i.e. the occurrence of slag inclusion in the meniscus of the crystallizer under the current continuous casting crystallizer and water gap structural parameters, casting process parameters, molten steel and slag phase physical parameter system is correctly determined.
TABLE 1 physical Properties parameters of molten Steel and slag phases
The embodiment has the following beneficial effects:
calculating the comprehensive influence of continuous casting crystallizer and water gap structural parameters, casting process parameters, molten steel and slag phase physical parameters, molten steel turbulence characteristic quantity and other factors on slag coiling of the crystallizer, and quantitatively judging whether slag coiling occurs at a meniscus and the position of slag coiling occurs on the meniscus under the current parameters. Based on the judging conditions, the casting parameters can be adjusted and optimized according to the actual production conditions, the occurrence rate of slag is effectively reduced, and the surface quality qualification rate of the continuous casting billet is improved.
In addition, the invention provides a judging system for the occurrence of meniscus slag in a crystallizer in a continuous casting process, which comprises the following steps:
the parameter acquisition module is used for acquiring structural parameters of the continuous casting crystallizer and the water gap, casting process parameters, molten steel and slag phase physical parameters and molten steel turbulence characteristic quantity under the current process conditions;
the first influence factor determining module is used for determining influence factors of the continuous casting crystallizer and water gap structural parameters and the casting process parameters on the slag inclusion index to obtain a first influence factor;
the second influence factor determining module is used for determining the influence factors of the physical parameters of the molten steel and the slag phase on the slag reeling index to obtain second influence factors;
the third influence factor determining module is used for determining the influence factor of the molten steel turbulence characteristic quantity on the slag reeling index to obtain a third influence factor;
the meniscus non-dimensional slag inclusion index calculation module is used for combining the first influence factor, the second influence factor and the third influence factor and performing non-dimensionalization to obtain a meniscus non-dimensional slag inclusion index;
the critical minimum dimensionless slag inclusion index calculation module is used for determining a critical minimum dimensionless slag inclusion index based on the physical parameters of the molten steel and the slag phase;
and the comparison and judgment module is used for determining whether the meniscus is curled and the position where the curled slag occurs according to the meniscus non-dimensional curled slag index and the critical minimum non-dimensional curled slag index.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the core concept of the invention; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (4)
1. A method for judging occurrence of meniscus slag in a crystallizer in a continuous casting process is characterized by comprising the following steps:
obtaining structural parameters of a continuous casting crystallizer and a water gap, casting process parameters, physical parameters of molten steel and slag phases and turbulence characteristic quantity of the molten steel under the current process conditions;
determining the influence factors of the continuous casting crystallizer and water gap structural parameters and the casting process parameters on the slag inclusion index to obtain a first influence factor;
determining an influence factor of the physical parameters of the molten steel and the slag phase on the slag reeling index to obtain a second influence factor;
determining an influence factor of the molten steel turbulence characteristic quantity on the slag reeling index to obtain a third influence factor;
combining the first influence factor, the second influence factor and the third influence factor and performing dimensionality to obtain a meniscus dimensionless slag inclusion index;
determining a critical minimum dimensionless slag inclusion index based on the molten steel and slag phase physical parameters;
determining whether slag rolling occurs on the meniscus and the position where the slag rolling occurs according to the meniscus non-dimensional slag rolling index and the critical minimum non-dimensional slag rolling index;
the calculation formula of the first influence factor is as follows:
，
wherein Zc geo Is the influencing factor of continuous casting crystallizer and water gap structural parameter and casting technological parameter to slag index, v pull For drawing speed D SEN Is the inner diameter of the water gap L mold And W is mold Respectively the length and the width of the crystallizer, beta is the outlet angle of a water gap, H id The immersion depth of the water gap;
the calculation formula of the second influence factor is as follows:
，
wherein Zc pro Is the influence factor of the physical parameters of molten steel and slag phase on the slag coiling index, ρ slag Is the slag density, mu slag Viscosity of slag, ρ steel Is the density of molten steel, mu steel Is the viscosity of molten steel, sigma is the surface tension of steel-slag, h slag Is the thickness of the slag layer;
the calculation formula of the third influence factor is as follows:
，
wherein Zc tur Is the influence factor of the turbulence characteristic quantity of molten steel on slag rolling index, omega z Is the vorticity in the z direction,is the z-direction pulsation speed;
the expression of the meniscus dimensionless slag inclusion index is:
，
wherein Zc is a dimensionless slag inclusion index, zc geo Is the influencing factor of continuous casting crystallizer and water gap structural parameter and casting process parameter to slag inclusion index, zc pro Zc is the influencing factor of the physical parameters of molten steel and slag phase to the slag coiling index tur Is the influence factor of the turbulence characteristic quantity of the molten steel on the slag rolling index.
2. The method for determining occurrence of meniscus slag inclusion in a continuous casting process according to claim 1, wherein determining a critical minimum dimensionless slag inclusion index based on the molten steel and slag phase physical parameters specifically comprises:
determining a molten steel and slag phase system according to the molten steel and slag phase physical parameters;
and determining a critical minimum dimensionless slag inclusion index of slag inclusion under the molten steel and slag phase system through numerical simulation calculation of multiphase flow of coupling molten steel and slag phase.
3. The method for determining occurrence of meniscus slag in a crystallizer in a continuous casting process according to claim 1, wherein determining whether slag is generated in the meniscus and the position of slag generation according to the meniscus non-dimensional slag index and the critical minimum non-dimensional slag index specifically comprises:
according to the non-dimensional slag rolling index of the meniscus, determining the distribution condition of the non-dimensional slag rolling number on the whole meniscus of the crystallizer under the current process condition;
and comparing the maximum dimensionless slag inclusion index on the meniscus with the critical minimum dimensionless slag inclusion index based on the distribution condition, and determining whether slag inclusion occurs on the meniscus and the position where the slag inclusion occurs.
4. A system for determining occurrence of meniscus slag in a crystallizer in a continuous casting process, applied to the determination method as set forth in any one of claims 1 to 3, comprising:
the parameter acquisition module is used for acquiring structural parameters of the continuous casting crystallizer and the water gap, casting process parameters, molten steel and slag phase physical parameters and molten steel turbulence characteristic quantity under the current process conditions;
the first influence factor determining module is used for determining influence factors of the continuous casting crystallizer and water gap structural parameters and the casting process parameters on the slag inclusion index to obtain a first influence factor;
the second influence factor determining module is used for determining the influence factors of the physical parameters of the molten steel and the slag phase on the slag reeling index to obtain second influence factors;
the third influence factor determining module is used for determining the influence factor of the molten steel turbulence characteristic quantity on the slag reeling index to obtain a third influence factor;
the meniscus non-dimensional slag inclusion index calculation module is used for combining the first influence factor, the second influence factor and the third influence factor and performing non-dimensionalization to obtain a meniscus non-dimensional slag inclusion index;
the critical minimum dimensionless slag inclusion index calculation module is used for determining a critical minimum dimensionless slag inclusion index based on the physical parameters of the molten steel and the slag phase;
and the comparison and judgment module is used for determining whether the meniscus is curled and the position where the curled slag occurs according to the meniscus non-dimensional curled slag index and the critical minimum non-dimensional curled slag index.
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