Structure for controlling flow field of slab crystallizer

By setting supports and guides in the crystallizer, the flow field of molten steel was optimized, which solved the problem of the impact of the high-speed molten steel stream at the submerged entry nozzle outlet on the narrow side of the crystallizer. This improved the casting speed of the slab casting machine, reduced equipment costs and operational complexity, and achieved the effect of optimizing the flow field.

CN223699270UActive Publication Date: 2025-12-23CONTINUOUS CASTING TECH ENG OF CHINA
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Patent Information

Application Number
CN202423275670.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-12-23
Estimated Expiration
2034-12-30

AI Technical Summary

Technical Problem

In the existing technology for slab continuous casting, the high-speed molten steel stream at the submerged entry nozzle outlet can easily lead to an increase in the impact strength of the narrow edge of the crystallizer, resulting in uneven shell growth and crack formation, which limits the increase in casting speed. Furthermore, electromagnetic braking technology suffers from high equipment modification costs, high costs, and limited effectiveness.

Method used

By installing supports and guides in the crystallizer, the velocity of the high-speed molten steel stream at the submerged nozzle outlet is reduced through physical methods, the flow field structure is optimized, and the guides are made of high-temperature and impact-resistant materials to change the angle and spacing of the molten steel flow field and reduce the impact intensity of the steel flow.

Benefits of technology

It achieves increased casting speed of slab casting machine, reduced equipment investment and operating costs, and the device is easy to operate, with significant flow field optimization effect, avoiding the disadvantages of electromagnetic braking.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a structure for controlling a flow field of a slab crystallizer, which is applied to the crystallizer, and a submersed nozzle is arranged in the crystallizer. Comprising a support and a flow guide part. The top end of the bracket is mounted on the crystallizer cover, and the bottom end of the bracket extends into the crystallizer; and one or more flow guide pieces are mounted at the bottom end of the bracket, are positioned on the outer side of an outlet of the submersed nozzle, and are positioned between the outlet and the crystallizer copper plate. A flow guide piece is arranged between the crystallizer copper plate and a molten steel outlet of the submersed nozzle through a bracket; and a high-speed steel liquid stream flowing out of the submersed nozzle impacts on the flow guide piece, so that the speed of the high-speed steel liquid stream at an outlet of the submersed nozzle is reduced through a physical method.
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Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of steel metallurgy, and specifically relates to a structure for controlling the flow field of slab crystallizer. BACKGROUND

[0002] The production practice of slab continuous casting shows that the surface and internal defects of slab and the remelting of primary shell are closely related to the flow characteristics of molten steel in the crystallizer. Research shows that the high-speed molten steel jet at the outlet of the submerged nozzle rushes to the narrow side of the crystallizer, which easily causes the remelting of the primary solidified shell at the narrow side, leading to uneven growth of the shell and easy formation of corner edge cracks. The increase of the pulling speed will also significantly increase the flow rate of the nozzle jet, intensify the impact on the narrow side, cause uneven growth of the shell, and even cause the accident of leakage, while the backflow after impacting the narrow side will cause the meniscus of the crystallizer to fluctuate violently, easily causing the steel slag to be entrained, and the uneven spreading of the protective slag will also lead to the formation of cracks; while the downward jet is easy to rush into the deep part of the liquid phase hole, increasing the floating distance of inclusions and reducing the floating probability of inclusions. This is one of the main reasons why the pulling speed of slab continuous casting cannot be further improved.

[0003] At present, the main means for the above problems is electromagnetic braking technology. Its principle is to increase the magnetic field in the crystallizer area to slow down the high-speed molten steel jet at the outlet of the nozzle to reduce the impact on the narrow side. However, it also has some shortcomings, such as large initial investment, high requirement for equipment modification, high operating cost, limited range of magnetic field, limited braking effect, uneven flow rate change, etc. INVENTION CONTENTS

[0004] In view of the above defects in the prior art, a structure for controlling the flow field of slab crystallizer is provided to reduce the flow rate of high-speed molten steel jet at the outlet of the submerged nozzle to reduce the impact of the steel flow on the narrow side of the crystallizer.

[0005] The technical scheme adopted by the utility model to solve the above technical problems is:

[0006] The structure for controlling the flow field of slab crystallizer is applied in the crystallizer, and the submerged nozzle is placed in the crystallizer.

[0007] It comprises a support and a flow guide piece. The top end of the support is installed on the cover of the crystallizer, and the bottom end of the support extends into the crystallizer. One or more flow guide pieces are installed on the bottom end of the support. The flow guide piece is located outside the outlet of the submerged nozzle and between the outlet and the copper plate of the crystallizer.

[0008] According to the above technical scheme, the top end of the support is installed on the cover of the crystallizer by detachable connection. The support and the flow guide piece are provided in multiple specifications, which can be detached and replaced according to requirements. The flow guide piece is made of existing high-temperature-resistant and impact-resistant materials.

[0009] According to the technical scheme, the conical cylindrical flow guide member is connected to the crystallizer cover by one or two supports; a plurality of molten steel outlets are arranged at the bottom of the submerged nozzle, and the conical cylindrical flow guide member is arranged at the circumferential side of the molten steel outlets, and the molten steel flows out from the outlets and impacts on the conical cylindrical flow guide member.

[0010] According to the technical scheme, the cross section of the conical cylindrical flow guide member is circular, polygonal, or a closed figure formed by straight lines and curves.

[0011] According to the technical scheme, the plate-shaped flow guide member is connected to the crystallizer cover by one or two supports; a plurality of molten steel outlets are arranged at the bottom of the submerged nozzle, and the plate-shaped flow guide member is arranged between the molten steel outlets and the inner wall of the crystallizer.

[0012] According to the technical scheme, the plate-shaped flow guide member is a flat plate or a circular arc plate.

[0013] According to the technical scheme, according to requirements, a plurality of flow guide members with different inclination angles are arranged; the angle of the molten steel impacting on the flow guide member is changed, so that the molten steel flow field is changed; the distance between the flow guide member and the inner wall of the crystallizer is not less than 25 mm.

[0014] According to the technical scheme, the support is of an integral structure or a block structure;

[0015] The support is of an integral structure, and the support is fixedly installed on the crystallizer cover in a detachable connection mode, and the support surrounds the circumferential side of the submerged nozzle;

[0016] The support is of a block structure, and the support is fixedly installed on the crystallizer cover in a detachable connection mode; for the plate-shaped flow guide member, one plate-shaped flow guide member is arranged with one support of the block structure; and for the conical cylindrical flow guide member, one or more supports are connected to the crystallizer cover.

[0017] According to the technical scheme, a plurality of holes for improving the molten steel flow field are arranged on the flow guide member.

[0018] According to the technical scheme, the flow guide member is a rectangular plate with a length of 350-400 mm and a thickness of 15-25 mm; each flow guide member is arranged with one support, the top end of the support is fixed to the bottom of the crystallizer cover by a bolt, the bottom end of the support is connected to the flow guide member of the rectangular plate, and the flow guide member is arranged in an inclined manner; and the flow guide member is located in the region below the molten steel surface.

[0019] The utility model has the following beneficial effects:

[0020] 1. By the support, the flow guide is arranged between the crystallizer copper plate and the molten steel outlet of the submerged nozzle; the high-speed molten steel stream flowed out of the submerged nozzle impacts on the flow guide, so as to reduce the speed of the high-speed molten steel stream at the outlet of the submerged nozzle by physical method. Under the action of the flow guide, the following advantages are achieved:

[0021] Firstly, the molten steel flow field in the crystallizer is optimized, the impact of the steel flow on the narrow surface of the crystallizer is reduced, so as to further improve the drawing speed of the slab caster.

[0022] Secondly, compared with the prior art, the device is simple and reasonable, does not need electromagnetic coil and power consumption, and reduces the investment cost and operation cost of the equipment.

[0023] Thirdly, the device is installed on the crystallizer cover and is easy to operate.

[0024] 2. The flow guide is provided with a plurality of holes to better improve the flow field.

[0025] The above description is only a summary of the technical scheme of the utility model, in order to more clearly understand the technical means of the utility model, and the utility model can be implemented according to the content of the specification, the following is the preferred embodiment of the utility model and the detailed description of the drawings. The specific implementation of the utility model is given in detail by the following examples and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0026] The drawings described herein are used to provide further understanding of the utility model, constitute a part of the present application, the schematic embodiment of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation on the utility model.

[0027] Fig. 1 It is the front view of the embodiment provided by the utility model;

[0028] Fig. 2 It is the top view of the embodiment provided by the utility model;

[0029] In the drawing, 1, crystallizer; 2, submerged nozzle; 3, support; 4, flow guide; 5, crystallizer cover; A, top surface of the crystallizer cover; B, top surface of the crystallizer copper plate; C, molten steel surface; D, insertion depth of the submerged nozzle. DETAILED DESCRIPTION

[0030] The following combines the drawings Figs. 1-2The principles and features of the present application are described, the examples are used to explain the present application, and are not intended to limit the scope of the present application. In the following paragraphs, the present application is described in more detail with reference to the accompanying drawings. The advantages and features of the present application will be more apparent from the following description and claims. It should be noted that the drawings are very simplified and use non-precise proportions, only to facilitate, clearly, and assist in explaining the purpose of the present application embodiments.

[0031] It should be noted that when a component is referred to as being "fixed" to another component, it can be directly on the other component or there can be intervening components. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or there can be intervening components. When a component is referred to as being "disposed" on another component, it can be directly on the other component or there can be intervening components. The terms "vertical", "horizontal", "left", "right", and similar expressions used herein are for illustrative purposes only.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] Referring to Figs. 1-2 As shown in the drawings, the control panel provided by the present application is applied in the crystallizer 1, and the submerged nozzle 2 is arranged in the crystallizer.

[0034] Embodiment 1

[0035] The structure comprises a support 3 and a flow guide 4. The top end of the support is mounted on the crystallizer cover 5, and the bottom end of the support extends into the crystallizer. One or more flow guides are mounted on the bottom end of the support. The flow guide is located outside the outlet of the submerged nozzle and between the outlet and the copper plate of the crystallizer.

[0036] In the embodiment, a flow guide is arranged between the crystallizer copper plate and the molten steel outlet of the submerged nozzle by the support; the high-speed molten steel stream flowing out of the submerged nozzle impacts on the flow guide, so as to reduce the speed of the high-speed molten steel stream at the outlet of the submerged nozzle by physical method. Under the action of the flow guide, the molten steel flow field in the crystallizer is optimized, and the impact of the molten steel on the narrow surface of the crystallizer is reduced, so as to further improve the casting speed of the slab caster. Compared with the prior art, the device has the characteristics of simple and reasonable equipment, no need of electromagnetic coil and power consumption, and reduction of investment cost and operation cost of the equipment. In addition, the device is installed on the crystallizer cover and is easy to operate.

[0037] In embodiment 1, the top end of the support is detachably connected to the crystallizer cover, and the support and the flow guide are provided in multiple specifications and are detachable and replaceable according to requirements; the flow guide is made of existing high-temperature-resistant and impact-resistant materials such as copper plates.

[0038] Embodiment 2

[0039] The structure and principle of embodiment 2 are similar to those of embodiment 1, and the difference lies in that a structure of the flow guide is given. A conical cylindrical flow guide is connected to the crystallizer cover by one or two supports; a plurality of molten steel outlets are arranged at the bottom of the submerged nozzle, the conical cylindrical flow guide is arranged on the side of the molten steel outlets, and the molten steel flows out of the outlets and impacts on the conical cylindrical flow guide.

[0040] Preferably, the cross section of the conical cylindrical flow guide is circular, polygonal, or a closed figure formed by straight lines and curves.

[0041] Embodiment 3

[0042] The structure and principle of embodiment 3 are similar to those of embodiment 1, and the difference lies in that another structure of the flow guide is given. A plate-shaped flow guide is connected to the crystallizer cover by one or two supports; a plurality of molten steel outlets are arranged at the bottom of the submerged nozzle, and the plate-shaped flow guide is located between the molten steel outlets and the inner wall of the crystallizer.

[0043] Preferably, the plate-shaped flow guide is a flat plate or a circular arc plate.

[0044] In embodiments 2 and 3, flow guides with multiple inclination angles are arranged according to requirements; the angle of the molten steel impacting on the flow guide is changed, so as to change the molten steel flow field; the distance between the flow guide and the inner wall of the crystallizer is not less than 25 mm.

[0045] Embodiment 4

[0046] The structure and principle of embodiment 4 are similar to those of embodiments 1-3, and the difference lies in that the support adopts an integrated structure or a block structure.

[0047] If the support adopts an integrated structure, the support is fixedly installed on the crystallizer cover in a detachable connection mode, and the support surrounds the peripheral side of the submerged entry nozzle;

[0048] If the support adopts an integrated structure, the support is fixedly installed on the crystallizer cover in a detachable connection mode, and the support surrounds the peripheral side of the submerged entry nozzle;

[0049] In embodiments 1-4, a plurality of holes for improving the molten steel flow field are arranged on the flow guide.

[0050] A preferred embodiment is given, the flow guide adopts a rectangular plate, the length is 350mm-400mm, and the thickness is 15mm-25mm; each flow guide is provided with a support, the top end of the support is fixed on the top of the crystallizer cover through a bolt, the bottom end of the support is fixedly connected with the flow guide adopting a rectangular plate (which can be detachable or non-detachable, and is determined according to requirements), the flow guide is arranged in an inclined manner, and the inclination angle is set according to requirements; the flow guide is located in the area below the molten steel surface. In the figure, A is the top surface of the crystallizer cover, B is the top surface of the crystallizer copper plate, C is the molten steel surface, and D is the insertion depth of the submerged entry nozzle.

[0051] The working principle of the utility model is as follows:

[0052] After the molten steel flows out of the submerged entry nozzle, the molten steel contacts the flow guide, the flow guide has a significant influence on the molten steel flow field, so that the purpose of optimizing the molten steel flow field in the crystallizer is achieved, and the impact of the molten steel on the narrow surface of the crystallizer is also significantly reduced.

[0053] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form; any ordinary technical personnel in the industry can implement the utility model according to the drawings shown in the specification and the above description; however, any equivalent changes, modifications and evolution of the above-mentioned technical content within the scope of the technical scheme of the utility model are equivalent embodiments of the utility model; meanwhile, any equivalent changes, modifications and evolution of the above-mentioned technical content within the scope of the technical scheme of the utility model are equivalent embodiments of the utility model; meanwhile, any equivalent changes, modifications and evolution of the above-mentioned technical content within the scope of the technical scheme of the utility model are equivalent embodiments of the utility model.

Claims

1. A structure for controlling the flow field in a slab crystallizer, applied in a crystallizer, with the submerged nozzle placed inside the crystallizer; Its features are: It includes a support and a flow guide; the top of the support is mounted on the crystallizer cover, and the bottom of the support extends into the crystallizer; one or more flow guides are installed on the bottom of the support, and the flow guides are located outside the outlet of the immersion nozzle and between the outlet and the copper plate of the crystallizer.

2. The structure for controlling the flow field of a slab crystallizer according to claim 1, characterized in that: The top of the support is mounted on the crystallizer cover via a detachable connection. Both the support and the flow guide are available in various specifications, allowing for disassembly and replacement as needed. The flow guide is made of existing high-temperature resistant and impact-resistant materials.

3. The structure for controlling the flow field of a slab crystallizer according to claim 1 or 2, characterized in that: A conical cylindrical guide is used, which is connected to the crystallizer cover by one or two supports; several molten steel outlets are provided at the bottom of the submerged nozzle, and the conical cylindrical guide is placed around the molten steel outlets, so that the molten steel flows out of the outlets and impacts the conical cylindrical guide.

4. The structure for controlling the flow field of a slab crystallizer according to claim 3, characterized in that: The cross-section of the conical cylindrical guide is circular, polygonal, or a closed shape composed of straight lines and curves.

5. The structure for controlling the flow field of a slab crystallizer according to claim 1, characterized in that: A plate-shaped flow guide is used, which is connected to the crystallizer cover by one or two supports; several molten steel outlets are provided at the bottom of the submerged entry nozzle, and the plate-shaped flow guide is located between the molten steel outlets and the inner wall of the crystallizer.

6. The structure for controlling the flow field of a slab crystallizer according to claim 5, characterized in that: The plate-shaped flow guide uses flat plates or arc plates.

7. The structure for controlling the flow field of a slab crystallizer according to claim 4 or 6, characterized in that: Depending on the requirements, various tilt angles of the flow guides can be set; the distance between the flow guides and the inner wall of the crystallizer should not be less than 25mm.

8. The structure for controlling the flow field of a slab crystallizer according to claim 4 or 6, characterized in that: The support structure can be either an integrated structure or a modular structure; The bracket adopts an integrated structure and is fixedly installed on the crystallizer cover in a detachable connection manner. The bracket surrounds the periphery of the immersion inlet. The support adopts a modular structure and is fixedly installed on the crystallizer cover in a detachable connection manner. For plate-shaped flow guides, one plate-shaped flow guide is equipped with a modular support; for conical or cylindrical flow guides, one or more supports are connected to the crystallizer cover.

9. The structure for controlling the flow field of a slab crystallizer according to claim 1, characterized in that: The guide has several holes for improving the flow field of molten steel.

10. The structure for controlling the flow field of a slab crystallizer according to claim 1, characterized in that: The flow guide is made of rectangular plate with a length of 350mm~400mm and a thickness of 15mm~25mm. Each flow guide is equipped with a bracket. The top of the bracket is fixed to the bottom of the crystallizer cover with bolts. The bottom of the bracket is connected to the flow guide made of rectangular plate. The flow guide is arranged at an angle. The entire flow guide is located in the area below the steel liquid surface.