CN116809914A - Ladle long nozzle structure for reducing turbulence intensity of tundish area and design method - Google Patents
Ladle long nozzle structure for reducing turbulence intensity of tundish area and design method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 155
- 239000010959 steel Substances 0.000 claims abstract description 155
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 40
- 229910052742 iron Inorganic materials 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 16
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000011819 refractory material Substances 0.000 claims description 4
- 238000005253 cladding Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 12
- 239000002893 slag Substances 0.000 abstract description 11
- 238000005266 casting Methods 0.000 abstract description 9
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 3
- 238000009749 continuous casting Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000007547 defect Effects 0.000 description 5
- 241000593989 Scardinius erythrophthalmus Species 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 239000011247 coating layer Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
- B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
Abstract
The application relates to the technical field of ferrous metallurgy continuous casting technology, in particular to a ladle long nozzle structure for reducing turbulence intensity of a tundish and a design method. The application aims at the problems of strong turbulence and easy slag reeling after molten steel enters a tundish in the ladle casting process, and provides a ladle long nozzle outlet structure for reducing the turbulence intensity of a tundish impact area in the ladle casting process and a design method thereof from the design angle of controlling the fluid passing area and the outlet flow velocity.
Description
Technical Field
The application relates to the technical field of ferrous metallurgy continuous casting technology, in particular to a ladle long nozzle structure for reducing turbulence intensity of a tundish and a design method.
Background
With the continuous improvement of the quality requirements of users on steel, the smelting of molten steel with few inclusions and high cleanliness has become the focus of steel making scientific and technical research. The ladle is a container for containing molten steel, the ladle long nozzle is a device arranged between the bottom outlet of the ladle and the tundish, and smelted molten steel is conveyed to the tundish through the molten steel outlet in the ladle.
Turbulence is the movement of fluids that is common in nature and occurs when fluids flow at high speeds. Turbulence is essentially characterized by its random nature of the vortex structure and the random movement of these vortices within the fluid relative to laminar flow, so that turbulence can cause exchange and pulsation of momentum, energy, concentration, etc. between adjacent layers of fluid.
The ladle long nozzle is a vertical tubular device made of corrosion-resistant refractory materials, the upper port is connected with the ladle bottom outlet and is bowl-shaped so as to ensure full contact with the ladle outlet, the lower part is straight pipe-shaped, and the bottom molten steel outlet is connected with a tundish; during casting, the ladle is arranged above the tundish, and molten steel flowing out of the ladle is conveyed into the tundish through the long nozzle by virtue of gravitational potential energy. Because the pressure of molten steel is high, gravitational potential energy is converted into kinetic energy, serious turbulence is formed after the molten steel flows into a ladle, and severe turbulence is brought to molten steel in a tundish, so that slag is rolled up in the molten steel, secondary oxidation is caused, and the cleanliness of the molten steel is seriously affected.
In order to restrain turbulence and reduce the influence of the turbulence on the ladle molten steel in the prior art, a turbulence suppressor is generally adopted, namely a basin-shaped container is arranged under a long nozzle, and the turbulence is reduced by a method of counteracting return flow and inlet flow, so that the influence range of the turbulence on the ladle molten steel is limited.
However, the prior art has the following problems:
1. the ladle long nozzle is of a vertical tubular structure, the flow rate of molten steel entering the tundish is high, the molten steel is scattered to the periphery after directly flushing the bottom of the ladle, and a flow stream is turned up along the wall of the ladle, so that red eye of the molten steel surface of the tundish is easily caused, and secondary oxidation and slag rolling of the molten steel are caused;
2. the existing turbulence suppressor can reduce turbulence to a certain extent and limit the influence range, but can not completely solve the turbulence problem, molten steel directly rushes to the bottom of a tundish after entering the tundish, strong impact energy of molten steel returns to the liquid level, turbulent slag can still be caused, red eye near a long nozzle is formed, and secondary oxidation of molten steel is caused;
3. the existing turbulence inhibitor has high price and high use cost, and the molten steel is easy to be polluted after the corrosion of the body refractory.
Disclosure of Invention
The application aims to solve the technical problems that: aiming at the defects of the prior art, the ladle long nozzle structure for reducing the turbulence intensity of the tundish and the design method are provided, so that the turbulence intensity of an impact area of the tundish can be effectively reduced, molten steel slag is prevented, and casting stability is improved.
In order to solve the technical problems, the application adopts the following technical scheme:
1. ladle long nozzle structure for reducing turbulence intensity of tundish
The ladle long nozzle structure for reducing the turbulence intensity of the tundish is sequentially provided with an upper port 1, a pipe body 2 and a molten steel outlet 3 from top to bottom, wherein the top of the upper port 1 is connected with the ladle, and the bottom of the molten steel outlet 3 is connected with the tundish; the bottom of the molten steel outlet 3 is hemispherical, a circular middle hole 4 is formed in the center of the hemispherical, a plurality of vertical openings 7 are uniformly formed in the side wall of the molten steel outlet 3 along the circumferential direction, the vertical openings 7 are respectively communicated with the circular middle hole 4 through a plurality of slits 5, and a coating layer 6 is arranged outside the side wall of the molten steel outlet 3.
Preferably, the upper port 1 is a bowl-shaped port, and the pipe body 2 is made of refractory material.
Preferably, the length of the slit 5 and the vertical opening 7 satisfies the following formula:
L 1n +L 2n ＜H m
wherein L is 1n For the length of the nth vertical opening 7, L 2n To the length of the slit 5 connected to the nth vertical opening 7, H m Is the depth of immersed molten steel in the tundish when the long nozzle is used.
Preferably, the areas of the plurality of slits 5 are all equal, and the total area of the plurality of slits 5 is larger than the area of the circular middle hole 4.
Preferably, the total area S of the plurality of slits 5 and the circular mesopores 4 satisfies the following formula:
wherein Re is 0 The method is characterized in that the method is used for preparing the molten steel in a long nozzle, Q is the volume coefficient of the molten steel in the state of a preset molten steel laminar flow, ρ is the density of the molten steel, η is the dynamic viscosity coefficient of the molten steel, and d is the characteristic size of the inner cavity of a tundish.
Preferably, the cladding layer 6 is made of a sheet iron material, and the sheet iron material has a melting point R 0 Higher than the temperature T of molten steel in ladle 1 And is lower than the temperature T of molten steel in the tundish 2 。
2. Ladle long nozzle design method for reducing turbulence intensity of tundish
Based on the same inventive concept, the application also provides a design method of the ladle long nozzle structure for reducing the turbulence intensity of the tundish, which comprises the following steps:
s1, determining the maximum Reynolds number Re of molten steel in a tundish in a laminar state through experimental data max ；
S2, according to the maximum Reynolds number Re in the laminar flow state max Calculating the maximum molten steel flow velocity v of the molten steel outlet of the long nozzle max The specific formula is as follows:
wherein ρ is the density of the molten steel, η is the dynamic coefficient of viscosity of the molten steel, and d is the characteristic size of the inner cavity of the tundish;
s3, increasing the outlet area of the long nozzle, namely uniformly arranging a plurality of vertical openings on the side wall of the molten steel outlet along the circumferential direction, and arranging a plurality of corresponding slits on the hemispherical bottom of the molten steel outlet so that each vertical opening is communicated with the original circular middle hole at the bottom of the molten steel outlet through the corresponding slit;
s4, limiting the outlet flow speed of the long nozzle, specifically according to the maximum molten steel flow speed v max Determining the number N of the slits and the total area S of the slits and the circular middle holes;
s5, coating the iron sheet material outside the side wall of the molten steel outlet.
Further, in step S3, the lengths of the slit and the vertical opening satisfy the following equation:
L 1n +L 2n ＜H m
wherein L is 1n For the length of the nth vertical opening, L 2n To the length of the slit connected with the nth vertical opening, H m Is the depth of immersed molten steel in the tundish when the long nozzle is used.
Further, in step S4, the total area S of the slit and the circular mesopore satisfies the following formula:
wherein Re is 0 The method is characterized in that the method is used for preparing the molten steel in a long nozzle, Q is the volume coefficient of the molten steel in the state of a preset molten steel laminar flow, ρ is the density of the molten steel, η is the dynamic viscosity coefficient of the molten steel, and d is the characteristic size of the inner cavity of a tundish.
Further, in step S5, the melting point R of the iron sheet material 0 Satisfies the following formula:
T 1 ＜R 0 ＜T 2
wherein T is 1 T is the temperature of molten steel in the ladle 2 Is the temperature of the molten steel in the tundish.
Compared with the prior art, the application has the following main advantages:
1. according to the method, the maximum molten steel flow rate of the molten steel outlet of the long nozzle is determined according to the maximum Reynolds number when the molten steel in the tundish is in a laminar flow state, and the molten steel flow rate of the molten steel outlet is limited in a mode that a plurality of vertical openings and slits are formed in the molten steel outlet of the long nozzle of the ladle to increase the area of the molten steel outlet, so that the turbulence intensity of an impact area of the tundish can be effectively reduced, slag is prevented from being rolled up by the molten steel, and the casting stability is improved;
2. according to the ladle long nozzle structure designed by the application, the total area of a molten steel outlet is increased by more than one time compared with the original circular mesopore area, the flow rate of the molten steel at the outlet can be reduced by more than 50% under the condition of the same static pressure, and meanwhile, the flow rate of the molten steel flowing into a tundish can be further reduced due to the small width and slender slit and the large contact area with the molten steel, so that the Reynolds number of the molten steel in the tundish is reduced;
3. according to the application, the outer wall of the molten steel outlet of the long water gap is coated with the iron sheet material, so that the scattering at the opening can be prevented before the long water gap is immersed in the tundish, meanwhile, the melting point of the iron sheet material is lower than the temperature of molten steel in the tundish, and after formal pouring, the iron sheet is melted, so that molten steel flows out from the vertical opening, the flow rate of molten steel can be obviously reduced, and the occurrence rate of defects such as inclusion, slag winding and the like in the tundish is effectively reduced.
Drawings
FIG. 1 is a schematic diagram of a ladle shroud in an embodiment of the present application;
FIG. 2 is a bottom view of a ladle shroud in an embodiment of the present application;
fig. 3 is a flowchart of a ladle shroud design method in an embodiment of the present application.
In the figure: 1. an upper port; 2. a tube body; 3. a molten steel outlet; 4. a circular middle hole; 5. a slit; 6. a coating layer; 7. a vertical opening.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. 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 addition, the technical features of the embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
It should be noted that each step/component described in the present application may be split into more steps/components, or two or more steps/components or part of operations of the steps/components may be combined into new steps/components, according to the implementation needs, to achieve the object of the present application.
According to the ladle long nozzle structure for reducing turbulence intensity of the tundish, as shown in fig. 1-2, an upper port 1, a pipe body 2 and a molten steel outlet 3 are sequentially arranged from top to bottom, the top of the upper port 1 is connected with the ladle, and the bottom of the molten steel outlet 3 is connected with the tundish; the bottom of the molten steel outlet 3 is hemispherical, a circular middle hole 4 is formed in the center of the hemispherical, a plurality of vertical openings 7 are uniformly formed in the side wall of the molten steel outlet 3 along the circumferential direction, the vertical openings 7 are respectively communicated with the circular middle hole 4 through a plurality of slits 5, and a coating layer 6 is arranged outside the side wall of the molten steel outlet 3.
Further, the upper port 1 is specifically a bowl-shaped port, and the pipe body 2 is specifically made of refractory materials.
Further, the lengths of the slit 5 and the vertical opening 7 satisfy the following formula:
L 1n +L 2n ＜H m
wherein L is 1n For the length of the nth vertical opening 7, L 2n To the length of the slit 5 connected to the nth vertical opening 7, H m Is the depth of immersed molten steel in the tundish when the long nozzle is used.
Further, the areas of the slits 5 are equal, and the total area of the slits 5 is larger than the area of the circular middle hole 4.
The Reynolds number, also known as the Reynolds number, is a standard number used to determine the state of a viscous fluid. The formula is as follows:
wherein v is the flow rate of the fluid, m/s and ρ are the density of the molten steel, kg/m3 and η are the dynamic viscosity coefficients of the molten steel, N.s/m2 and d are the characteristic dimensions and m.
The flow of the fluid can be distinguished to be laminar flow or turbulent flow by using the Reynolds number, the Reynolds number is small, which means that the viscous force among all particles is dominant when the fluid flows, and all particles of the fluid regularly flow parallel to the inner wall of the pipeline and are in a laminar flow state. The high Reynolds number means that the inertial force is dominant, and the fluid is in a turbulent flow (also called turbulent flow) state;
the tundish Reynolds number Re <2000 in this example is in a laminar flow state, re=2000-4000 is in a transition state, and Re >4000 is in a turbulent flow state;
in the traditional ferrous metallurgy fluid container, re is far more than 4000, so that the flowing state of the container is in a turbulent state, the speed v of the outlet flow is reduced as much as possible from the direction of reducing the turbulent intensity, the sectional area of the outlet is increased, and the turbulent intensity of molten steel entering the tundish can be effectively reduced.
Therefore, the total area S of the plurality of slits 5 and the circular mesopores 4 satisfies the following formula:
wherein Re is 0 The method is characterized in that the method is used for preparing the molten steel in a long nozzle, Q is the volume coefficient of the molten steel in the state of a preset molten steel laminar flow, ρ is the density of the molten steel, η is the dynamic viscosity coefficient of the molten steel, and d is the characteristic size of the inner cavity of a tundish.
Further, the cladding layer 6 is made of a sheet iron material, and the sheet iron material has a melting point R 0 Higher than the temperature T of molten steel in ladle 1 And is lower than the temperature T of molten steel in the tundish 2 。
In the second embodiment, the slab double-flow tundish has a medium capacity of 60 tons, a long nozzle inner diameter of 95mm and an outlet area of 70.85cm 2 The immersion depth of the nozzle is 350mm during normal casting;
the design method of the ladle long nozzle structure comprises the following steps: in order to meet the uniformity of unidirectional flow, the device is designed into 4 slits, the width of each slit is 12mm, the length of each slit is 300mm, the diameter of an outlet is reduced to 70mm, and the slit area is covered by iron sheets with the thickness of 0.5 mm;
the practical effects are as follows: the total area of outlets is 182.47cm 2 The total area of the outlet is increased compared with the original outlet157.3% is added, the outlet flow velocity is obviously reduced, the red eye phenomenon in the long nozzle impact area is basically disappeared, the using effect is tracked, and the occurrence rate of defects such as inclusion, slag winding and the like is reduced from 2.6% to 2.3% under the condition that other processes are not changed.
In the third embodiment, the single-flow tundish for continuous sheet billet casting has a medium capacity of 45 tons, a long nozzle inner diameter of 80mm and an outlet area of 50.24cm 2 The immersion depth of the nozzle is 300mm during normal casting;
the design method of the ladle long nozzle structure comprises the following steps: in order to meet the uniformity of unidirectional flow, the device is designed into 3 slits, the width of each slit is 12mm, the length of each slit is 250mm, the diameter of an outlet is reduced to 50mm, and a 0.5mm thick iron sheet is coated to cover the slit area;
the practical effects are as follows: the total area of outlets is 109.63cm 2 The total area of the outlet is increased by 118.2%, the outlet flow speed is obviously reduced, the red eye phenomenon in the long nozzle impact area is basically eliminated, the using effect is tracked, and the occurrence rate of defects such as inclusion, slag winding and the like is reduced from 5.4% to 4.8% under the condition that other processes are not changed.
Based on the same inventive concept, the present embodiment further provides a method for designing a ladle shroud structure for reducing turbulence intensity of a tundish, as shown in fig. 3, which specifically includes the following steps:
s1, determining the maximum Reynolds number Re of molten steel in a tundish in a laminar state through experimental data max ；
S2, according to the maximum Reynolds number Re in the laminar flow state max Calculating the maximum molten steel flow velocity v of the molten steel outlet of the long nozzle max The specific formula is as follows:
wherein ρ is the density of the molten steel, η is the dynamic coefficient of viscosity of the molten steel, and d is the characteristic size of the inner cavity of the tundish;
s3, increasing the outlet area of the long nozzle, namely uniformly arranging a plurality of vertical openings on the side wall of the molten steel outlet along the circumferential direction, and arranging a plurality of corresponding slits on the hemispherical bottom of the molten steel outlet so that each vertical opening is communicated with the original circular middle hole at the bottom of the molten steel outlet through the corresponding slit;
s4, limiting the outlet flow speed of the long nozzle, specifically according to the maximum molten steel flow speed v max Determining the number N of the slits and the total area S of the slits and the circular middle holes;
s5, coating the iron sheet material outside the side wall of the molten steel outlet.
Further, in step S3, the lengths of the slit and the vertical opening satisfy the following equation:
L 1n +L 2n ＜H m
wherein L is 1n For the length of the nth vertical opening, L 2n To the length of the slit connected with the nth vertical opening, H m Is the depth of immersed molten steel in the tundish when the long nozzle is used.
Further, in step S4, the total area S of the slit and the circular mesopore satisfies the following formula:
wherein Re is 0 The method is characterized in that the method is used for preparing the molten steel in a long nozzle, Q is the volume coefficient of the molten steel in the state of a preset molten steel laminar flow, ρ is the density of the molten steel, η is the dynamic viscosity coefficient of the molten steel, and d is the characteristic size of the inner cavity of a tundish.
Further, in step S5, the melting point R of the iron sheet material 0 Satisfies the following formula:
T 1 ＜R 0 ＜T 2
wherein T is 1 T is the temperature of molten steel in the ladle 2 Is the temperature of the molten steel in the tundish.
To sum up:
1. according to the method, the maximum molten steel flow rate of the molten steel outlet of the long nozzle is determined according to the maximum Reynolds number when the molten steel in the tundish is in a laminar flow state, and the molten steel flow rate of the molten steel outlet is limited in a mode that a plurality of vertical openings and slits are formed in the molten steel outlet of the long nozzle of the ladle to increase the area of the molten steel outlet, so that the turbulence intensity of an impact area of the tundish can be effectively reduced, slag is prevented from being rolled up by the molten steel, and the casting stability is improved;
2. according to the ladle long nozzle structure designed by the application, the total area of a molten steel outlet is increased by more than one time compared with the original circular mesopore area, the flow rate of the molten steel at the outlet can be reduced by more than 50% under the condition of the same static pressure, and meanwhile, the flow rate of the molten steel flowing into a tundish can be further reduced due to the small width and slender slit and the large contact area with the molten steel, so that the Reynolds number of the molten steel in the tundish is reduced;
3. according to the application, the outer wall of the molten steel outlet of the long water gap is coated with the iron sheet material, so that the scattering at the opening can be prevented before the long water gap is immersed in the tundish, meanwhile, the melting point of the iron sheet material is lower than the temperature of molten steel in the tundish, and after formal pouring, the iron sheet is melted, so that molten steel flows out from the vertical opening, the flow rate of molten steel can be obviously reduced, and the occurrence rate of defects such as inclusion, slag winding and the like in the tundish is effectively reduced.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In the description of the application, unless otherwise indicated, "a number" means one or more; the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like refer to an orientation or positional relationship based on that shown in the drawings, for convenience of description and simplicity of description, and do not necessarily indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the application and is not intended to limit the application, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (10)
1. The utility model provides a ladle long mouth of a river structure of well packet zone turbulence intensity is reduced which characterized in that: an upper port (1), a pipe body (2) and a molten steel outlet (3) are sequentially arranged from top to bottom, the top of the upper port (1) is connected with a ladle, and the bottom of the molten steel outlet (3) is connected with a tundish; the bottom of molten steel outlet (3) is the hemisphere, circular mesopore (4) has been seted up at the hemisphere center, a plurality of vertical openings (7) have evenly been seted up along circumference to molten steel outlet (3) lateral wall, a plurality of vertical openings (7) respectively through a plurality of slits (5) with circular mesopore (4) are linked together, molten steel outlet (3) lateral wall outside is equipped with coating (6).
2. Ladle shroud structure for reducing turbulence intensity in tundish area according to claim 1, characterized in that the upper port (1) is embodied as bowl-shaped port and the tube body (2) is embodied as refractory material.
3. Ladle shroud structure for reducing turbulence intensity in tundish area according to claim 1, characterized in that the length of the slit (5) and vertical opening (7) satisfies the following formula:
L 1n +L 2n ＜H m
wherein L is 1n Is the length of the nth vertical opening (7), L 2n For the length of the slit (5) connected with the nth vertical opening (7), H m Is the depth of immersed molten steel in the tundish when the long nozzle is used.
4. Ladle shroud structure with reduced turbulence intensity in the tundish area according to claim 1, characterized in that the slits (5) are all of equal area and the total area of the slits (5) is larger than the area of the circular mesopore (4).
5. Ladle shroud structure with reduced turbulence intensity in the tundish area according to claim 1, characterized in that the total area S of the plurality of slits (5) and circular mesopores (4) satisfies the following formula:
wherein Re is 0 The method is characterized in that the method is used for preparing the molten steel in a long nozzle, Q is the volume coefficient of the molten steel in the state of a preset molten steel laminar flow, ρ is the density of the molten steel, η is the dynamic viscosity coefficient of the molten steel, and d is the characteristic size of the inner cavity of a tundish.
6. The ladle shroud structure for reducing turbulence intensity in a tundish area according to claim 1, wherein the cladding layer (6) is made of a sheet iron material, and the sheet iron material has a melting point R 0 Higher than the temperature T of molten steel in ladle 1 And is lower than the temperature T of molten steel in the tundish 2 。
7. A method of designing a ladle shroud structure as claimed in any one of claims 1 to 6, comprising the steps of:
s1, determining the maximum Reynolds number Re of molten steel in a tundish in a laminar state through experimental data max ；
S2, according to the maximum Reynolds number Re in the laminar flow state max Calculating the maximum molten steel flow velocity v of the molten steel outlet of the long nozzle max The specific formula is as follows:
wherein ρ is the density of the molten steel, η is the dynamic coefficient of viscosity of the molten steel, and d is the characteristic size of the inner cavity of the tundish;
s3, increasing the outlet area of the long nozzle, namely uniformly arranging a plurality of vertical openings on the side wall of the molten steel outlet along the circumferential direction, and arranging a plurality of corresponding slits on the hemispherical bottom of the molten steel outlet so that each vertical opening is communicated with the original circular middle hole at the bottom of the molten steel outlet through the corresponding slit;
s4, limiting the outlet flow speed of the long nozzle, specifically according to the maximum molten steel flow speed v max Determining the number N of the slits and the total area S of the slits and the circular middle holes;
s5, coating the iron sheet material outside the side wall of the molten steel outlet.
8. The design method according to claim 7, wherein in step S3, the lengths of the slit and the vertical opening satisfy the following formula:
L 1n +L 2n ＜H m
wherein L is 1n For the length of the nth vertical opening, L 2n To the length of the slit connected with the nth vertical opening, H m Is the depth of immersed molten steel in the tundish when the long nozzle is used.
9. The method according to claim 7, wherein in step S4, the total area S of the slit and the circular mesopore satisfies the following formula:
wherein Re is 0 The method is characterized in that the method is used for preparing the molten steel in a long nozzle, Q is the volume coefficient of the molten steel in the state of a preset molten steel laminar flow, ρ is the density of the molten steel, η is the dynamic viscosity coefficient of the molten steel, and d is the characteristic size of the inner cavity of a tundish.
10. The method according to claim 7, wherein in step S5, the melting point R of the iron sheet material 0 Satisfies the following formula:
T 1 ＜R 0 ＜T 2
wherein T is 1 Is steel in ladleTemperature of water, T 2 Is the temperature of the molten steel in the tundish.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310735373.2A CN116809914A (en) | 2023-06-20 | 2023-06-20 | Ladle long nozzle structure for reducing turbulence intensity of tundish area and design method |
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| CN202310735373.2A CN116809914A (en) | 2023-06-20 | 2023-06-20 | Ladle long nozzle structure for reducing turbulence intensity of tundish area and design method |
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