Water gas atomizing nozzle and continuous casting machine

Abstract

This application belongs to the field of steelmaking continuous casting technology and discloses a water-air atomizing nozzle and a continuous casting machine. The water-air atomizing nozzle includes a nozzle body and a nozzle core. The nozzle body has a mixing channel extending along its axial direction. The mixing channel is a Laval-type channel along its extension direction. The mixing channel includes a contraction section, a narrow throat, and an expansion section arranged in sequence. One end of the nozzle body adjacent to the contraction section has an air inlet channel and a water inlet channel that are connected to the mixing channel. One end of the nozzle body adjacent to the expansion section has a spray channel that is connected to the mixing channel, and the spray direction of the spray channel is parallel to the axial direction of the nozzle body. The nozzle core is sealed to the expansion section so that the water-air mixture in the mixing channel can only be sprayed out from the spray channel. After passing through the contraction section, narrow throat, and expansion section of the mixing channel, the water and air can be fully mixed and atomized, and finally sprayed evenly from the spray channel to the surface of the casting billet, thereby achieving uniform cooling of the casting billet and ensuring the quality of the casting billet.

Description

Technical Field

[0001] This application relates to the field of steelmaking continuous casting technology, specifically to a water vapor atomizing nozzle and a continuous casting machine. Background Technology

[0002] Continuous casting, also known as continuous steel casting, is a process of continuously pouring molten steel into steel billets. It serves as an intermediate step between steelmaking and rolling, offering significant advantages such as simplified production processes, increased metal yield, energy savings, improved working conditions, ease of automation, and high-quality billets. In the continuous casting process, the continuous casting nozzle is a crucial component of the continuous casting machine, and its performance directly affects the quality of the billets and production efficiency.

[0003] In related technologies, the cooling methods for the secondary cooling zone of continuous casting machines are mainly water atomization and water-air atomization, corresponding to water atomizing nozzles and water-air atomizing nozzles. However, with the continuous development of high-efficiency continuous casting technology, the requirements for the cooling effect of the secondary cooling zone of continuous casting machines are becoming increasingly stringent. Conventional water-air atomizing nozzles have revealed many problems in practical applications, such as uneven droplet size and velocity distribution, insufficient cooling intensity, and unsatisfactory atomization effect.

[0004] This section provides background information related to this application, which is not necessarily prior art. Utility Model Content

[0005] The purpose of this application is to solve or at least alleviate some or all of the aforementioned problems. Therefore, the purpose of this application is to provide a water-air atomizing nozzle and a continuous casting machine, which controls the solidification process of the cast billet and ensures the quality of the cast billet by uniformly spraying atomized water onto the surface of the billet.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] In a first aspect, this application provides a water vapor atomizing nozzle, comprising:

[0008] The nozzle body has a mixing channel extending along its axial direction. The mixing channel is a Laval-type channel along its extension direction. The mixing channel includes a constriction section, a narrow throat, and an expansion section arranged sequentially. The nozzle body has an air inlet channel and a water inlet channel connected to the mixing channel at one end adjacent to the constriction section. The nozzle body also has a spray channel connected to the mixing channel at one end adjacent to the expansion section. The spray direction of the spray channel is parallel to the axial direction of the nozzle body.

[0009] The nozzle core is sealed to the expansion section so that the water-air mixture in the mixing channel can only be ejected from the injection channel.

[0010] As an alternative to the water vapor atomizing nozzle, the injection channel includes an injection section and a connecting section. The injection section extends along the axial direction of the nozzle body, and the connecting section is used to connect the injection section and the expansion section.

[0011] As an alternative to the water vapor atomizing nozzle, the cross-sectional shape of the spray section is annular, and the centerline of the spray section coincides with the axis of the nozzle body.

[0012] As an optional embodiment of the water vapor atomizing nozzle, the number of the spray sections is at least two, and the at least two spray sections are arranged concentrically at intervals with the axis of the nozzle body as the center.

[0013] As an optional embodiment of the water vapor atomizing nozzle, the number of the connecting parts is at least two, and the at least two connecting parts are arranged circumferentially along the nozzle body, and each connecting part connects all the spraying parts and the expansion section.

[0014] As an optional embodiment of the water vapor atomizing nozzle, the water inlet channel in the contraction section has a water inlet direction perpendicular to the air inlet channel in the contraction section.

[0015] As an alternative to the water vapor atomizing nozzle, the centerline of the water inlet channel in its extending direction coincides with the centerline of the contraction section in its extending direction.

[0016] As an optional embodiment of the water vapor atomizing nozzle, the air intake channel includes a first section and a second section perpendicularly connected to the first section. The extension direction of the first section is parallel to the extension direction of the contraction section. The first section is connected to the contraction section, and its extension direction is perpendicular to the extension direction of the contraction section.

[0017] As an optional embodiment of the water vapor atomizing nozzle, the end of the nozzle core facing away from the nozzle body has a conical surface structure.

[0018] Secondly, this application provides a continuous casting machine, including the water vapor atomizing nozzle as described above.

[0019] The beneficial effects of this application are as follows:

[0020] The water-air atomizing nozzle provided in this application includes a nozzle body and a nozzle core. The nozzle body has a mixing channel extending along its axial direction. The mixing channel is a Laval-type channel along its extension direction. The mixing channel includes a contraction section, a narrow throat, and an expansion section arranged sequentially. One end of the nozzle body adjacent to the contraction section has an air inlet channel and a water inlet channel that communicate with the mixing channel. One end of the nozzle body adjacent to the expansion section has a spray channel that communicates with the mixing channel. The spray direction of the spray channel is parallel to the axial direction of the nozzle body. The nozzle core is sealed to the expansion section so that the water-air mixture in the mixing channel can only be sprayed out from the spray channel. After passing through the contraction section, narrow throat, and expansion section of the mixing channel, the water and air can be fully mixed and atomized. Finally, it is uniformly sprayed out from the spray channel to the surface of the casting billet, thereby achieving uniform cooling of the casting billet and ensuring the quality of the casting billet.

[0021] The continuous casting machine provided in this application, by applying the aforementioned water-air atomizing nozzle, can control the solidification process of the billet and ensure the quality of the billet by uniformly spraying water atomized onto the surface of the billet. Attached Figure Description

[0022] Figure 1 This is a longitudinal sectional view of the water vapor atomizing nozzle provided in the embodiments of this application.

[0023] Figure 2 yes Figure 1 A cross-sectional view of the water vapor atomizing nozzle at point AA.

[0024] In the picture:

[0025] 1. Nozzle body; 11. Mixing channel; 111. Contraction section; 112. Narrow throat; 113. Expansion section; 12. Air intake channel; 121. First section; 122. Second section; 13. Water intake channel; 14. Jet channel; 141. Jet section; 142. Connecting section;

[0026] 2. Nozzle core; 21. Conical surface structure. Detailed Implementation

[0027] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0028] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] In the description of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] The technical solution of this application will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] This application provides a continuous casting machine for continuously pouring molten steel into solid billets. It mainly includes a molten steel conveying and pouring system and a secondary cooling system. The secondary cooling system is used to uniformly spray a water-air mixture onto the surface of the billet. The heat of the billet is quickly removed by water evaporation and convection heat transfer, so that the liquid core gradually solidifies towards the center, ensuring the quality of the billet.

[0032] like Figures 1 to 2 As shown, this application provides a water vapor atomizing nozzle, including a nozzle body 1 and a nozzle core 2. The nozzle body 1 has a mixing channel 11 extending along its axial direction. The mixing channel 11 is a Laval-type channel along its extension direction. The mixing channel 11 includes a contraction section 111, a narrow throat 112, and an expansion section 113 arranged sequentially. One end of the nozzle body 1 adjacent to the contraction section 111 has an air inlet channel 12 and a water inlet channel 13 connected to the mixing channel 11. One end of the nozzle body 1 adjacent to the expansion section 113 has a spray channel 14 connected to the mixing channel 11, and the spray direction of the spray channel 14 is parallel to the axial direction of the nozzle body 1. The nozzle core 2 is sealed to the expansion section 113 so that the water vapor mixture in the mixing channel 11 can only be sprayed out from the spray channel 14. After passing through the contraction section 111, the narrow throat 112, and the expansion section 113 of the mixing channel 11, the water vapor can be fully mixed and atomized, and finally uniformly sprayed out from the spray channel 14 to the surface of the casting billet, thereby achieving uniform cooling of the casting billet and ensuring the quality of the casting billet.

[0033] It should be noted that the mixing channel 11 is a Laval-type channel, which enables efficient mixing and acceleration of water and air, ultimately producing a high-speed, uniform water-air mixture with extremely fine atomized particles. This ensures uniform cooling of the billet and guarantees billet quality. Specifically, the contraction section 111 of the mixing channel 11 initially accelerates the low-pressure mixture of compressed air and water at this point, while increasing the fluid kinetic energy through cross-sectional reduction, causing the water and air to initially mix and form a non-uniform vapor-liquid two-phase flow. The narrow throat 112, as the velocity critical zone, further increases the fluid velocity, generating turbulence that breaks the viscous binding of the water-air interface, tearing the water into fine liquid filaments or droplets, achieving deep gas-liquid mixing. The expansion section 113 further accelerates the fluid passing through the narrow throat 112, and the airflow continuously shears and breaks up the droplets, ultimately forming a uniform, non-stratified high-speed water-air mixture jet. This jet efficiently transfers kinetic energy to the high-temperature billet, achieving uniform cooling and ensuring billet quality.

[0034] In some embodiments, the water inlet direction of the water inlet channel 13 within the contraction section 111 is perpendicular to the air inlet direction of the air inlet channel 12 within the contraction section 111. This arrangement allows the airflow and water flow to impact each other directly, which significantly enhances the shear force and turbulence disturbance between the gas and liquid phases, and increases the contact area between the airflow and liquid flow, ultimately improving the uniformity of gas-liquid mixing.

[0035] Furthermore, the centerline of the water inlet channel 13 in its extending direction coincides with the centerline of the converging section 111 in its extending direction. This fully utilizes the structural characteristics of the Laval channel, allowing the water flow to achieve stable and efficient acceleration, providing a high-energy foundation for subsequent atomization. In addition, the air inlet channel 12 includes a first section 121 and a second section 122 perpendicularly connected to the first section 121. The first section 121 is used to connect to a compressed air supply device. The extending direction of the first section 121 is parallel to the extending direction of the converging section 111, and the first section 121 is connected to the converging section 111, with its extending direction perpendicular to the extending direction of the converging section 111. This configuration allows the airflow to apply shear force to the water flow from the side, directly tearing the high-speed water flow into fine liquid filaments. This simultaneously optimizes droplet size and jet velocity, outputting an atomized flow with both fine droplets and high kinetic energy, meeting the stringent requirements for atomization quality in scenarios.

[0036] In some embodiments, the injection channel 14 includes an injection section 141 and a connecting section 142. The connecting section 142 is used to connect the injection section 141 and the expansion section 113. The injection section 141 extends along the axial direction of the nozzle body 1, so that the ejected atomized jet can be ejected along the axial direction of the nozzle body 1, thereby reducing the kinetic energy loss of the atomized jet.

[0037] like Figure 2As shown, the cross-sectional shape of the spray section 141 is annular, and the center line of the spray section 141 coincides with the axis of the nozzle body 1. This arrangement increases the spray area of ​​the atomized fluid, which not only allows the atomized fluid to be sprayed evenly onto the casting billet, but also improves the cooling efficiency of the casting billet.

[0038] In some embodiments, the number of spray sections 141 is at least two, and the at least two spray sections 141 are arranged concentrically at intervals about the axis of the nozzle body 1. For example, in Figures 1 to 2 In this embodiment, there are two spray sections 141 arranged concentrically, with one spray section 141 having a larger annular diameter and the other spray section 141 having a smaller annular diameter. In other embodiments, the number of spray sections 141 can be any number, such as one, three, four, five, or six, and can be designed according to specific needs, without limitation here.

[0039] In some embodiments, the number of connecting portions 142 is at least two, and the at least two connecting portions 142 are arranged at circumferential intervals along the nozzle body 1, and each connecting portion 142 connects all injection portions 141 and expansion sections 113. For example, Figure 2 In this embodiment, there are three connecting portions 142 (dashed lines), which are evenly spaced along the circumference of the nozzle body 1. In other embodiments, the number of connecting portions 142 can be any number, such as one, two, four, five, or six, and is not limited here.

[0040] In addition, Figure 1 In one embodiment, the connecting portion 142 is arranged perpendicular to the axis of the nozzle body 1. In other embodiments, the connecting portion 142 may also be arranged at an acute angle to the flow direction of the fluid, which can further reduce the kinetic energy loss of the fluid.

[0041] In some embodiments, the nozzle core 2 and the expansion section 113 of the nozzle body 1 are connected by a threaded seal, which also facilitates the disassembly of the nozzle core 2.

[0042] Furthermore, the end of the nozzle core 2 facing away from the nozzle body 1 is a conical surface structure 21. This conical surface structure 21 can guide and concentrate the atomized fluid ejected from the spray section 141 to a certain extent, ensuring that the atomized fluid is evenly and fully sprayed onto the surface of the billet, thus ensuring uniform cooling of the billet.

[0043] Obviously, the above embodiments of this application are merely examples for clear illustration and are not intended to limit the implementation of this application. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A water gas atomizing nozzle characterized by, include: The nozzle body (1) has a mixing channel (11) extending along its axial direction. The mixing channel (11) is a Laval-type channel along its extension direction. The mixing channel (11) includes a converging section (111), a narrow throat (112), and an expanding section (113) arranged sequentially. The nozzle body (1) has an air inlet channel (12) and a water inlet channel (13) connected to the mixing channel (11) at one end adjacent to the converging section (111). The nozzle body (1) has an injection channel (14) connected to the mixing channel (11) at one end adjacent to the expanding section (113). The ejection direction of the injection channel (14) is parallel to the axial direction of the nozzle body (1). The nozzle core (2) is sealed to the expansion section (113) so that the water-air mixture in the mixing channel (11) can only be ejected from the injection channel (14).

2. The water gas atomizing nozzle of claim 1, wherein, The injection channel (14) includes an injection section (141) and a connecting section (142). The injection section (141) extends along the axial direction of the nozzle body (1), and the connecting section (142) is used to connect the injection section (141) and the expansion section (113).

3. The water gas atomizing nozzle of claim 2, wherein, The cross-sectional shape of the spray section (141) is annular, and the center line of the spray section (141) coincides with the axis of the nozzle body (1).

4. The water gas atomizing nozzle of claim 3, wherein, The number of the spray section (141) is at least two, and the at least two spray sections (141) are arranged in concentric circles with the axis of the nozzle body (1) as the center.

5. The water vapor atomizing nozzle according to claim 4, characterized in that, The number of the connecting parts (142) is at least two, and the at least two connecting parts (142) are arranged at circumferential intervals along the nozzle body (1), and each connecting part (142) connects all the injection parts (141) and the expansion section (113).

6. The water gas atomizing nozzle according to any one of claims 1 to 5, characterized in that, The water inlet channel (13) in the contraction section (111) is perpendicular to the air inlet channel (12) in the contraction section (111).

7. The water gas atomizing nozzle of claim 6 wherein, The centerline of the water inlet channel (13) in its extension direction coincides with the centerline of the contraction section (111) in its extension direction.

8. The water gas atomizing nozzle of claim 7, wherein, The air intake channel (12) includes a first section (121) and a second section (122) perpendicularly connected to the first section (121). The extension direction of the first section (121) is parallel to the extension direction of the contraction section (111). The first section (121) is connected to the contraction section (111), and its extension direction is perpendicular to the extension direction of the contraction section (111).

9. The water gas atomizing nozzle of claim 6 wherein, The nozzle core (2) has a conical surface structure (21) at the end opposite to the nozzle body (1).

10. A continuous caster characterized by, Including the water vapor atomizing nozzle as described in any one of claims 1-9.

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