A device for ladle cyclone steelmaking

Abstract

The present invention relates to a device for ladle cyclone steelmaking, comprising a ladle, a bottom blowing device and a group of annular dams. 2 to 25 annular dams are arranged on the inner side wall of the ladle, the distance between every two annular dams is 100 to 500 mm, and the annular dams are provided with 2 to 10 dam gaps, and the dam gaps are evenly distributed along the annular dams. The cross section of the annular dam is a trapezoidal, rectangular or semicircular structure. A cyclone field of the ladle side wall is formed before and after the annular dam, including a uniform velocity incoming flow area, a fluid acceleration area, a cyclone area, a deceleration area, and a uniform outflow area. The corresponding ladle side wall is divided into a uniform velocity incoming flow section, annular dams, a cyclone section, a deceleration section and a uniform outflow section. The annular dams are composed of an acceleration section and a transition section, and the molten steel forms a cyclone field in the cyclone area. The present invention arranges multiple circles of annular dams in the ladle, and the refined molten steel in the ladle generates a cyclone, so that the inclusions gather, collide, grow and are removed to the center of the cyclone field, effectively remove the inclusions in the molten steel, and improve the cleanliness of the molten steel.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgical production and relates to a device for ladle cyclone steelmaking. Background Art

[0002] In terms of inclusion control technology, the converter process mainly increases the final carbon content to reduce the oxygen content of molten steel, so as to reduce the number of inclusions generated by the reaction between the deoxidizer and the oxygen in the steel. However, when smelting low-carbon or even ultra-low-carbon steel, the final carbon content of the converter is required to be very low, and the final oxygen content will inevitably increase. The inclusions generated by converter deoxidation cannot be reduced. Even if the final carbon content of the converter is increased for some medium-high carbon steels, the problem of inclusion generation cannot be completely eliminated, and the next step of refining has to be carried out.

[0003] In order to remove inclusions in molten steel to below the requirements of steel materials, the refining process is responsible for removing 80% of the inclusions. Some high-quality steel grades require lower inclusion content, and the refining process has a heavier task. To achieve the above goals, the main means adopted in the refining process are: ① by adjusting the position of argon blowing in the ladle to significantly reduce inclusions; ② by adjusting the amount of argon blowing in the ladle to obtain a small diameter bubble group and effectively remove inclusions; ③ by adjusting the top slag to transform the original high melting point inclusions in the molten steel into the removed low melting point inclusions; ④ by composite deoxidation to improve the deoxidation capacity of the deoxidizer, and the resulting inclusions are more complex and have a lower melting point, making the inclusions easier to remove.

[0004] In summary, the main direction of removing inclusions in the refining process is to reduce the melting point of inclusions to below the steelmaking temperature, so that the inclusions are liquid at the steelmaking temperature, and to remove inclusions to the maximum extent by adjusting the bottom argon blowing mode. However, the influence of ladle flow field on inclusions has not been studied in depth, and the research has only stayed at the phenomenon, without really solving the problem of removing inclusions in molten steel by changing the ladle flow field. Summary of the invention

[0005] The purpose of the present invention is to provide a ladle cyclone steelmaking device, which can effectively remove inclusions in molten steel by changing the ladle flow field so that the movement trajectory of inclusions gathers, grows and is removed in a desired direction, thereby improving the cleanliness of molten steel and the quality of refined steel, and at the same time speeding up the removal speed of inclusions in molten steel and shortening the refining time.

[0006] The technical scheme of the present invention is: a ladle cyclone steelmaking device, comprising a ladle and a bottom blowing device, wherein the bottom blowing device is arranged at the bottom of the ladle. 2 to 25 annular dams are arranged on the inner side wall of the ladle, the distance between every two annular dams is 100 to 500 mm, 2 to 10 dam gaps are arranged on the annular dams, the dam gaps are evenly distributed along the annular dams, and the cross section of the annular dams is a trapezoidal, rectangular or semicircular structure.

[0007] A cyclone field is formed on the side wall of the steel ladle before and after each annular dam. The cyclone field on the side wall of the steel ladle includes a uniform inflow area, a fluid acceleration area, a cyclone area, a deceleration area, and a uniform outflow area. The corresponding steel ladle side wall is divided into a uniform inflow section, annular dam, a cyclone section, a deceleration section, and a uniform outflow section. The annular dam is composed of an acceleration section and a transition section. The molten steel forms a cyclone field in the cyclone area. The distance between two annular dams is ≥ the diameter of the cyclone field or the distance between two annular dams is ≥ the height of the annular dams.

[0008] The inclination angle θ of the acceleration section of the trapezoidal structure annular dam is 10-90°, and the length of the transition section is 10-200mm. Its function is to increase the strength of the dam in a high temperature environment and slow down its erosion rate under the action of molten steel. The height h of the trapezoidal or rectangular structure annular dam is 10-200mm, and the radius of the semicircular structure annular dam is 10-200mm. Its function is to form a vortex zone in a uniform incoming flow. The corners of the annular dam are arc transitions. The width of the dam gap is 10-200mm. The distance between the two annular dams is ≥ the length of the vortex section (or the length of the annular dam is ≥ the height of the annular dam (transition section). This is to achieve vortexing of the molten steel, so that inclusions gather, collide, and grow toward the center of the vortex field.

[0009] The annular dam is cast on the inner side wall of the ladle with castables, or the refractory bricks and the annular dam are integrally embedded and installed on the inner side wall of the ladle.

[0010] The gap of the dam is to facilitate the swirl flow to carry the grown inclusions out of the swirl area. The inclination of the acceleration section is to increase the flow rate of the molten steel flow. The role of the transition section is to increase the strength of the dam under high temperature environment and slow down the erosion rate of the dam in the molten steel. Each dam corner is transitioned with an arc to prevent sharp corners or sharp pits. Its role is to ensure a smooth transition in each flow field, and secondly to reduce the erosion of the refractory by the molten steel to reduce the macro inclusions entering the molten steel.

[0011] The ladle cyclone steelmaking device of the present invention sets a plurality of annular dams in the ladle, so that the refined molten steel in the ladle generates a cyclone, changes the ladle flow field so that inclusions gather, collide, grow, and are removed toward the center of the cyclone field, effectively removes inclusions in the molten steel, improves the cleanliness of the molten steel, improves the quality of the refined steel, and at the same time speeds up the speed of removing inclusions in the molten steel and shortens the refining time. Compared with the prior art, the ladle cyclone steelmaking device of the present invention has the following beneficial effects:

[0012] ⑴ Without changing the refining process and increasing the cost, the probability of inclusions in the molten steel colliding, gathering and growing in the desired direction is significantly improved.

[0013] ⑵ Increase the speed of removing inclusions in molten steel and shorten the refining time.

[0014] ⑶ Effectively improve the cleanliness of molten steel and enhance the intrinsic quality of steel.

[0015] ⑷ Low one-time investment, ready for use, can be optimized at any time, and has strong flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is the elevation view of the steel ladle;

[0017] Figure 2 for Figure 1 A top view of

[0018] Figure 3 The swirl flow field diagram of the steel ladle side wall ( Figure 1 Figure A);

[0019] Figure 4 is the relationship between the radial position of inclusions and time;

[0020] Figure 5 is the ratio diagram of radial velocity and radial position;

[0021] Figure 6 This is the trace diagram of 125μm inclusions in the cyclonic flow field;

[0022] Figure 7 This is a diagram of large particle inclusions passing through the cloud layer of small particle inclusions.

[0023] Among them: 1-slag line, 2-package wall, 3-permanent layer, 4-working layer, 5-annular dam, 6-package bottom, 7-dam gap, 8-air-permeable bricks, 9-uniform inflow area, 10-ladle lining, 11-fluid acceleration area, 12-swirl area, 13-deceleration area, 14-uniform deflow area, 15-uniform inflow section, 16-acceleration section, 17-transition section, 18-swirl section, 19-deceleration section, 20-uniform deflow section, 21-swirl field, θ-acceleration section inclination, h-dam height. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with the embodiments and drawings. The protection scope of the present invention is not limited to the embodiments, and any changes made by those skilled in the art within the scope defined by the claims also fall within the protection scope of the present invention.

[0025] 1. Layout structure of ladle cyclone steelmaking device

[0026] The device for ladle cyclone steelmaking of the present invention comprises a ladle and a bottom blowing device, wherein the bottom blowing device is arranged at the bottom of the ladle. Figure 1 , Figure 2As shown, a ladle with a rated capacity of 120t is provided, including a ladle wall 2 and a ladle bottom 6. The ladle wall is provided with a slag line 1, a permanent layer 3 and a working layer 4. The ladle bottom is provided with air-permeable bricks 8, and the bottom blowing device blows argon into the ladle through the air-permeable bricks. There are 14 annular dams 5 from top to bottom on the inner side wall of the ladle. The cross section of the annular dam is a trapezoidal structure. The annular dams are cast on the ladle lining 10 with a castable, or the refractory bricks 4 and the annular dams 5 are integrally mounted on the ladle lining.

[0027] The distance between each two annular dams is 200mm (the distance between dams = 10 times the diameter of the cyclone field or the distance between dams = 10 times the height of the dam). Each annular dam is provided with 4 dam gaps 7, the width of the dam gaps is 100mm, and they are evenly distributed along the annular dams. During the flow of molten steel in the ladle, a cyclone field is formed on the side wall of the ladle before and after each annular dam, such as Figure 3 As shown, the cyclone field of the steel ladle side wall includes a uniform incoming flow area 9, a fluid acceleration area 11, a cyclone area 12, a deceleration area 13 and a uniform deflow area 14, and the corresponding steel ladle side wall is divided into a uniform incoming flow section 15, an annular dam 5, a cyclone section 18, a deceleration section 19 and a uniform deflow section 20. The annular dam is composed of an acceleration section 16 and a transition section 17. The molten steel forms a cyclone field 21 in the cyclone area. The inclination angle θ of the acceleration section is 30°, the length of the transition section is 10mm, and the diameter of the cyclone field in the cyclone area is 20mm (or the height of the dam is 20mm). The role of the trapezoidal dam is to form a cyclone area in the uniform incoming flow, so that the inclusions carried by the molten steel flowing into the cyclone area gather, collide and grow toward the center of the cyclone field.

[0028] The acceleration section of the annular dam increases the flow rate of the molten steel flow. The function of the transition section of the annular dam is to increase the strength of the dam under high temperature environment and slow down its erosion rate under the action of molten steel. The function of the trapezoidal annular dam (height is 20mm) is to form a vortex in the uniform flow. The function of the dam gap is to use the asymmetry of the ladle air bricks to make the molten steel have an uneven velocity distribution along the side wall of the ladle in the horizontal plane, thereby causing uneven pressure distribution along the side wall of the ladle in the horizontal plane, and finally making the molten steel in the cyclone field flow from the side with high pressure to the side with low pressure, so as to realize the continuous inflow of new phases and the continuous outflow of old phases in the cyclone field for continuous processing.

[0029] Arc transition is adopted at the corners of each annular dam to prevent sharp corners or sharp pits. Its function is to ensure smooth transition of each flow field, reduce the erosion of refractory by molten steel and thus reduce the macro inclusions entering the molten steel.

[0030] 2. Motion equation of inclusions in cyclonic flow field

[0031] With the development and application of smelting technologies such as composite deoxidation and top slag control, the inclusions in the ladle have gradually changed from the original irregular solid inclusions with high melting points to regular liquid spherical inclusions with low melting points. The object of control removal in this application is liquid spherical inclusions, which is also suitable for removing solid inclusions in molten steel. Secondly, the forces on inclusions in molten steel are complex, and a simple analysis is performed using equations.

[0032] The diameter of inclusions is mainly distributed in the range of 1 to 100 μm, and the main purpose is to remove inclusions with diameters of 1 μm to 100 μm in the molten steel. Figure 3 As shown in the figure, a cylindrical coordinate system is established in the two-dimensional cyclone zone with the center of the cyclone zone as the origin, which conforms to the right-hand rule. Assumptions: ① The molten steel is an incompressible fluid; ② The inclusion is an incompressible sphere; ③ The two-dimensional cyclone field is a steady-state cyclone field; ④ The influence of gravity is ignored; ⑤ The units are uniformly based on international standards; ⑥ The radius of the inclusion is very small relative to the radius of the cyclone zone. For the convenience of calculation, the influence of the inclusion on the cyclone field is ignored.

[0033] ⑴The density of molten steel at 1600℃ is ρ 液 =7000kg·m -3 , the density of inclusions is ρ 粒 =2700kg·m -3 .

[0034] (2) The radius of the swirl zone is R = 1 × 10 -2 m, angular velocity ω 液 =-100rad·s -1 , is a forced vortex.

[0035] ⑶ At the initial moment, t=0s, the inclusions are distributed at the edge of the cyclone field and move in a circular motion with the cyclone field.

[0036] 1. Radial direction:

[0037] (1) The change in momentum of a unit volume inclusion per unit time caused by the resultant force in the radial direction is:

[0038]

[0039] Where: ΔP r —Change in radial momentum per unit time, kg·m·s -2 ; m—inclusion mass per unit volume, kg; v r —Inclusion radial velocity, m·s -1 ρ 粒 —Inclusion density, kg·m -3 ; t—time, s.

[0040] (2) The centrifugal force generated in the radial direction by the circular motion of the inclusions per unit volume is:

[0041]

[0042] Where: F 离心 —Centrifugal force, N; v θ —Tangential velocity, m·s -1 .

[0043] (3) The radial pressure force on the inclusion per unit volume is:

[0044]

[0045] Where: —Radial pressure gradient, Pa·m -1 ρ 液 —Steel liquid density, kg·m -3 ;ω 液 —Steel vortex angular velocity, rad·s -1 ; r—radius from inclusion to vortex center, m; v θ液 —Tangential velocity of the molten steel at radius r, m·s -1 .

[0046] (4) The relative velocity of inclusions with diameters of 1 μm and 100 μm relative to the molten steel is approximately 4.2×10 -5 m / s and 4.2×10 -3 m / s. Corresponding relative Reynolds number They are: 1.2×10 -4 and 1.2, the relative Reynolds number is very small. Therefore, the surface viscous resistance of inclusions in molten steel can be calculated using the Stokes resistance formula.

[0047] Because the inclusions move relative to the molten steel, the viscous resistance (Stokes resistance formula) of the molten steel on the surface of the inclusions per unit volume in the radial direction is:

[0048] F r粘 =-n3πDηv r相对 (4)

[0049] Where: F r粘 —The viscous resistance of the inclusion surface per unit volume in the radial direction to the molten steel, N; n—The number of inclusions per unit volume, pieces; D—Inclusion diameter, m; η—Viscosity of the molten steel, Pa·s; v r相对 —In radial direction, velocity of inclusions relative to molten steel, m·s -1 .

[0050] According to the momentum theorem, combining equations (1), (2), (3), and (4), and transposing the terms, we obtain:

[0051]

[0052] Since the velocity of the molten steel is zero in the radial direction, we get:

[0053]

[0054] 2. Tangential direction

[0055] (1) The change in momentum of a unit volume inclusion in unit time caused by the resultant force in the tangential direction is:

[0056]

[0057] Where: ΔP θ —Change in tangential momentum per unit time, kg·m·s -2 ;v θ —Inclusion tangential velocity, m·s -1 .

[0058] (2) When the radial momentum of the inclusion is not zero, the radial momentum changes due to the tangential movement of the inclusion (the magnitude remains unchanged, but the direction changes). The tangential force generated by the radial momentum changing direction caused by the inclusion per unit volume per unit time is:

[0059]

[0060] Where: F 变向 —The radial momentum changes direction and is subjected to a tangential force, N.

[0061] (3) Since the pressure along the tangential direction is constant, the resultant pressure force per unit volume of inclusions in the tangential direction is zero.

[0062] (4) As the inclusions move relative to the molten steel, the viscous resistance of the molten steel on the surface of the inclusions per unit volume in the tangential direction (Stokes formula) is:

[0063] F θ粘 =-n3πDηv θ相对 (9)

[0064] Where: F θ粘 —The viscous resistance of the inclusion surface per unit volume in the tangential direction to the molten steel, N; v r相对 —Tangential direction, velocity of inclusions relative to molten steel, m·s -1 .

[0065] According to the momentum theorem, combining equations (7), (8), and (9), and transposing the terms, we obtain:

[0066]

[0067] Among them, v θ相对 =v θ -v θ液 , substituting into formula (10), we get:

[0068]

[0069] Combining equation (6) with equation (11) gives the differential form of the motion equations of inclusions in the cyclone field:

[0070]

[0071] This set of equations (Equation 12) is the motion equation of inclusions in the cyclonic flow field of molten steel.

[0072] 3. Relationship between radial position of inclusions and time

[0073] 1. Simplification of radial equations

[0074] The solution of equation 12 is very complicated. To facilitate the calculation, the following simplification is made:

[0075] v θ =ωr、v θ液 =ω 液 r. Substituting the radial equation of equation 12 and transposing the terms, we get:

[0076]

[0077] Where: ω—the angular velocity of the inclusions in the swirling flow field of the molten steel, rad·s -1 .

[0078] In the swirling flow field of molten steel, since the inclusions rotate with the molten steel, the angular velocity of the macroscopic motion of the inclusions is close to the angular velocity of the vortex of the molten steel. It is approximately considered that ω 液 =ω, substituting into equation 13, we get:

[0079]

[0080] 2. Solve the radial equation

[0081] In formula 14, n, D, η, ρ 粒 , 液 ,ω 液 As is a known constant, it can be seen that Equation 14 is a second-order homogeneous linear differential equation with constant coefficients.

[0082] Given: η = 2.5 × 10 -3 Pa·s、ρ 粒 =2700kg·m -3 , 液=7000kg·m -3 ,ω 液 =-100rad·s -1 ; Inclusions with a diameter of 1 μm: n = 1.9108280255 × 10 18 Substituting into equation 14, the general solution of the indefinite integral is:

[0083]

[0084] In the formula: C1, C2—arbitrary constants.

[0085] Initial boundary conditions:

[0086] (1) When t = 0, the inclusion is at the edge of the cyclone field, and the radial position is: r = R = 1 × 10 -2 m;

[0087] (2) When t = 0, the radial velocity of the inclusion is: v r = r′ = 0 m·s -1 .

[0088] Substitute them into equation 15 and we get:

[0089]

[0090] Similarly, the equations for the relationship between the radial position and time of inclusions with diameters of 5μm, 25μm, and 125μm in the cyclonic flow field can be solved:

[0091] 5μm:

[0092]

[0093] 25μm:

[0094]

[0095] 125μm

[0096]

[0097] From equations 16, 17, 18, and 19, we can get the relationship between the radial position of the inclusion in the cyclone field and time: Figure 4 As time goes by, the inclusions keep moving towards the center of the cyclone field. The inclusions with small diameters have large specific surface area, which makes them subject to large viscous resistance of the molten steel and slow centripetal movement. The inclusions with large diameters have small specific surface area, which makes them subject to small viscous resistance of the molten steel and fast centripetal movement.

[0098] 4. Traces of inclusions in the cyclone field

[0099] The tangential equation in equation 11 or equation group 12 is v θThe relationship equation with t, combined with equation 14 or equations 16, 17, 18, and 19, can give the trace. The calculation of the inclusion with a diameter of 125 μm is as follows:

[0100] v θ =ωr、v θ液 =ω 液 r. Substituting into the tangent equation in equation 11 or equation group 12 and shifting the terms, we get:

[0101]

[0102] Among them, n, D, η, ρ 粒 ,ω 液 is a known constant, As a variable, substitute equation 19 into equation 20 to obtain:

[0103]

[0104] Plotted from Equation 21, Figure 5 , we can see that the time is in the range of 0.01s<t<0.3s, Can be considered as a constant: It is also known that: n = 9.7834394904 × 10 11 D = 125 × 10 -6 m, η = 2.5 × 10 - 3 Pa·s、ρ 粒 =2700kg·m -3 ,ω 液 =-100rad·s -1 Substituting into equation 20, we get:

[0105]

[0106] Move the terms around and integrate to get:

[0107]

[0108] Where: C3—arbitrary constant.

[0109] Initial boundary conditions:

[0110] ① When t = 0.01s, it can be seen from formula 19 that the inclusion is still at the edge of the cyclone field, and its angular velocity can be approximately equal to the angular velocity of the cyclone field: ω = ω 液 =-100rad·s -1 Substituting into equation 23, we get:

[0111]

[0112] Will (where θ is the angle that the inclusion rotates in the tangential direction after t time, unit: rad) Substitute it into equation 24 and integrate it to get:

[0113]

[0114] Where: C4—arbitrary constant.

[0115] Initial boundary conditions:

[0116] ①When t=0.01s, the inclusion is approximately at the edge of the cyclone field, and the angle is θ=0.

[0117] Substituting into formula 25, we get:

[0118]

[0119] The combined equations 19 and 26 are the trajectory equations of inclusions with a diameter of 125 μm in the cyclonic flow field (condition: 0.01 s < t < 0.3 s):

[0120]

[0121] Equation group 27 is the trajectory equation of an inclusion with a diameter of 125 μm and an angle of 0 in the cyclonic flow field at the initial time t=0.01 s.

[0122] Similarly, when t = 0.01s, the inclusions are at the edge of the cyclone field, and the angles are The trace of an inclusion with a diameter of 125 μm in the cyclonic flow field. Figure 6 The figure shows the trajectory of an inclusion with a diameter of 125 μm in the cyclonic flow field. The area surrounded by the dotted line is the cyclonic flow area of ​​the molten steel, and the solid line is the movement trajectory of the inclusion with a diameter of 125 μm.

[0123] Depend on Figure 6 It can be seen that after the inclusions enter the cyclone field, they rotate along the cyclone field of the molten steel while overcoming the viscous resistance caused by the molten steel under the action of pressure to move toward the center of the cyclone field. The combined result is a spiral trajectory. As the inclusions continue to move closer to the center of the cyclone field, the distance between the inclusions becomes closer and closer, increasing the probability of inclusion collision and growth, and finally gathering and growing at the center of the cyclone field.

[0124] Under the action of the pressure force generated by the cyclonic field of molten steel, inclusions overcome the viscous resistance caused by the molten steel and gather toward the center of the cyclonic field. The distance between inclusions becomes closer and closer, increasing the probability of inclusion collision and growth, and finally they gather and grow at the center of the cyclonic field. This phenomenon is called the gathering effect.

[0125] 5. Effect of the movement of inclusions with different diameters in the cyclone field

[0126] In the cyclonic flow field, any annular region with small-diameter inclusions (taking inclusions with a diameter of 1 μm as an example) is taken, just like a "cloud layer". Using equation 16, we can know the radial motion trajectory of the annular region "cloud layer" where small particle inclusions are distributed; using equations 19 and 25, we can know the motion trajectory of large particle inclusions with a diameter of 125 μm. Figure 7 shown.

[0127] Depend on Figure 7 It can be seen that the large particle inclusions move faster in the radial direction than the small particle inclusions. As time goes by, the large particle inclusions will pass through the cloud of small particle inclusions. After the large particle inclusions enter the cloud of small particle inclusions, they will collide with the small particle inclusions on the same trajectory and grow.

[0128] In the cyclonic flow field of molten steel, the centripetal movement speed of large particle inclusions with the same density is faster than that of small particle inclusions. Large particle inclusions will pass through the cloud formed by small particle inclusions, collide with small particle inclusions on the same trajectory line and grow. This phenomenon is called cloud penetration effect.

[0129] 6. Continuous processing

[0130] In the cyclone field, if the grown inclusions cannot be discharged in time, the removal effect of the inclusions will not be achieved; if the treated old phase molten steel cannot be discharged in time, the new phase molten steel cannot flow in.

[0131] 1. From the Bernoulli equation (Equation 28), it can be seen that on the horizontal plane with the same depth, the flow rate and pressure are different, which leads to uneven pressure distribution along the side wall of the steel ladle on the horizontal plane, and finally makes the molten steel in the cyclone field flow from the side with high pressure to the side with low pressure, so as to realize the continuous inflow of new phase and continuous outflow of old phase of molten steel in the cyclone field.

[0132]

[0133] 2. Utilize the volatility of the molten steel flow field and the viscosity of the molten steel during the ladle refining process to make the new phase of the molten steel continuously flow into and the old phase continuously flow out of the cyclone field.

[0134] The above two methods realize continuous treatment of molten steel in the cyclone field. The outflowing old phase carries the grown inclusions into the mainstream field of the ladle. Driven by argon blowing at the bottom of the ladle, the grown inclusions can easily float up into the refining slag and be removed.

[0135] The present invention reduces the inclusion content in molten steel, effectively improves the cleanliness of molten steel, and enhances the intrinsic quality of steel.

[0136] The above is only used to illustrate the technical solution of the present invention. Those skilled in the art should understand that modifications or equivalent substitutions of the technology of the present invention that do not depart from the technical principles of the technical solution of the present invention are deemed to be within the protection scope of the present invention.

Claims

1. A ladle cyclone steelmaking device, comprising a ladle and a bottom blowing device, wherein the bottom blowing device is arranged at the bottom of the ladle, and is characterized in that: The inner side wall of the ladle is provided with 2 to 25 annular dams (5), the distance between every two annular dams is 100 to 500 mm, the annular dams are provided with 2 to 10 dam gaps (7), and the dam gaps are evenly distributed along the annular dams; the cross section of the annular dam is a trapezoidal, rectangular or semicircular structure.

2. The device for ladle cyclone steelmaking according to claim 1, characterized in that: A cyclonic flow field is formed on the steel ladle wall before and after each annular dam, and the cyclonic flow field on the steel ladle wall includes a uniform velocity incoming flow area (9), a fluid acceleration area (11), a cyclonic flow area (12), a deceleration area (13), and a uniform outflow area (14). The corresponding steel ladle wall is divided into a uniform velocity incoming flow section (15), an annular dam (5), a cyclonic flow section (18), a deceleration section (19), and a uniform outflow section (20); the annular dam is composed of an acceleration section (16) and a transition section (17), and the molten steel forms a cyclonic flow field (21) in the cyclonic flow section (12).

3. The ladle cyclone steelmaking device according to claim 2 is characterized in that: The distance between two annular dams ≥ the diameter of the cyclone field or the distance between two annular dams ≥ the height of the annular dams.

4. The ladle cyclone steelmaking device according to claim 2 is characterized in that: The inclination angle θ of the acceleration section (16) of the trapezoidal structure annular dam is 10 to 90°, and the length of the transition section is 10 to 200 mm.

5. The ladle cyclone steelmaking device according to claim 2 is characterized in that: The height h of the trapezoidal or rectangular annular dam is 10 to 200 mm, and the radius of the semicircular annular dam is 10 to 200 mm.

6. The ladle cyclone steelmaking device according to claim 1 is characterized in that: The corners of the annular dam (5) are arc transitions.

7. The ladle cyclone steelmaking device according to claim 1 is characterized in that: The width of the dam gap (7) is 10 to 200 mm.

8. The ladle cyclone steelmaking device according to claim 1 is characterized in that: The annular dam (5) is cast on the inner side wall of the ladle with a castable, or the refractory bricks and the annular dam are integrally embedded and installed on the inner side wall of the ladle.

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