CN114535559A

CN114535559A - Immersion type water gap

Info

Publication number: CN114535559A
Application number: CN202210281149.6A
Authority: CN
Inventors: 杨英杰; 祁新建; 李伟娟; 别金锋
Original assignee: HENAN XIBAO METALLURGY MATERIALS GROUP CO Ltd
Current assignee: HENAN XIBAO METALLURGY MATERIALS GROUP CO Ltd
Priority date: 2022-03-21
Filing date: 2022-03-21
Publication date: 2022-05-27

Abstract

The invention belongs to the technical field of refractory materials for continuous casting, and particularly relates to an immersion type water gap, which comprises a water gap body, wherein the water gap body comprises a bowl opening part, a same-diameter part, a first diameter-changing part and a second diameter-changing part which are sequentially connected from top to bottom, a flow guide separation block is arranged in the second diameter-changing part, an inlet hole is limited on the inner wall of the same-diameter part, the inlet hole extends to the bottom of the first diameter-changing part and is connected with the flow guide separation block, the upper part of the flow guide separation block is propped against the bottom of an inlet hole on the inner side of the first diameter-changing part, a steady flow structure is arranged on the flow guide separation block, and the outlet of the inlet hole is in an inverted trapezoid shape. The water gap is improved on the existing basis to increase a steady flow structure, the fluctuation of the liquid level of the crystallizer can be effectively reduced, and the continuous casting effect can be fully exerted.

Description

Immersion type water gap

Technical Field

The invention belongs to the technical field of refractory materials for continuous casting, and particularly relates to an immersion type water gap.

Background

The continuous casting of steel is a process of continuously cooling liquid steel with a certain superheat degree into a solid casting blank with a certain shape through a water-cooled crystallizer. With the application and development of continuous casting technology, especially because of the higher and higher requirements of users on the quality of steel and the intense competition of international markets, the quality of continuous casting billets is more and more emphasized, and the important work in continuous casting production is to strictly control the cleanliness of molten steel and reduce the defects of the casting billets.

The crystallizer, as the "heart" of the continuous casting machine, is the origin of most surface defects and internal quality problems of the continuous casting slab. Statistics show that nearly 80% of surface defects of a casting blank originate from a crystallizer, and the surface defects are the last ring for controlling the quality of molten steel in various process links of continuous casting and determine the surface quality of the casting blank and the content and distribution of non-metallic inclusions. The flowing state of the molten steel in the crystallizer directly influences the quality of the casting blank and the content and distribution of the non-metallic inclusions. At present, the method for improving the flow of molten steel in the crystallizer mainly comprises the technologies of electromagnetic stirring, electromagnetic braking and the like of the crystallizer, and as the crystallizer is made of a water-filled copper plate, a magnetic field is shielded by the copper plate and can be greatly attenuated, so that the action and the efficiency of the electromagnetic field are seriously influenced.

The submerged entry nozzle (submerged entry nozzle) is a refractory pouring sleeve installed at the bottom of a tundish in continuous steel casting equipment and inserted below the liquid level of molten steel in a crystallizer, and in the continuous casting process, the molten steel after refining is treated by the tundish and then is continuously injected into the crystallizer through the submerged entry nozzle to be cooled and solidified. The submerged nozzle protects the molten steel flow, prevents the molten steel from secondary oxidation, and simultaneously changes the flowing state of the molten steel in the crystallizer, and the flowing in the continuous casting crystallizer also has great influence on the quality and the yield of the continuous casting blank. The uneven discharge amount of the molten steel of each discharge hole caused by the bias flow of the molten steel in the immersion nozzle causes the fluctuation of the liquid level in the crystallizer, the defect of slag entrapment is easily formed, and the intensity of the fluctuation of the liquid level is aggravated along with the improvement of the continuous casting pulling speed, so the implementation of high-speed continuous casting is limited, and the greater economic benefit cannot be obtained. It is also very important that: because the upper corner of the discharge hole of the prior submerged nozzle is easy to limit the flowing of molten steel to form a negative pressure area, the molten steel and the protective slag are sucked and flow into the crystallizer again along with the main flow of the molten steel, so that the content of non-metallic inclusions in the molten steel is increased, and the quality of a casting blank is greatly influenced.

Basic research shows that the rotary flow of molten steel in a continuous casting immersion nozzle can effectively improve the uniformity and stability of the outlet flow of the nozzle, improve the flow state and temperature distribution in a crystallizer and reduce the meniscus liquid level fluctuation in the crystallizer; however, the swirl flow in the nozzle has an excellent influence on the flow of the molten steel in the crystallizer, and also has an adverse influence on the flow of the molten steel in the crystallizer, such as an increase in impact on the wide surface of the crystallizer. The prior submerged nozzle for continuous casting can not inhibit the adverse effect of the rotational flow in the nozzle on the flowing of the molten steel in the crystallizer, and can not completely meet the requirement of the rotational flow continuous casting in the nozzle.

Disclosure of Invention

The invention aims to provide a submerged nozzle for continuous casting, aiming at the problems in the prior art, the submerged nozzle is improved and provided with a steady flow structure on the basis of the prior art, can effectively reduce the fluctuation of the liquid level of a crystallizer, and can fully exert the continuous casting effect.

The technical scheme of the invention is as follows:

the utility model provides an immersion nozzle, includes the mouth of a river body, the mouth of a river body include from last to down connected gradually the bowl mouth portion, with footpath portion, first variable diameter portion and second variable diameter portion, second variable diameter portion in set up the water conservancy diversion spacer block, with footpath portion inner wall inject the inlet hole, the inlet hole extend to the bottom and the water conservancy diversion spacer block of first variable diameter portion and be connected, water conservancy diversion spacer block upper portion at the bottom of the inlet hole of first variable diameter portion inboard, the water conservancy diversion spacer block on set up the stationary flow structure, inlet hole exit be the shape of falling the ladder.

Specifically, the flow stabilizing structure is a flow stabilizing hole, and the flow stabilizing hole horizontally penetrates through the flow guide separation block.

Specifically, the flow stabilizing hole is positioned at the middle lower part of the flow guide separating block.

Specifically, the hole diameter of the outlet parts at two ends of the flow stabilizing hole is larger than that of the middle part of the flow stabilizing hole.

Specifically, the steady flow structure comprises a steady flow vertical hole arranged in the middle of the flow guide separation block and a steady flow branch hole connected with the steady flow vertical hole, and the diameter of the steady flow vertical hole is larger than that of the steady flow branch hole.

Specifically, the number of the steady flow branch holes is at least four, every two steady flow branch holes are symmetrically and obliquely extended to the lateral lower part of the flow guide separation block, and the outlets of the steady flow branch holes are formed in the lateral side of the lower part of the flow guide separation block.

Specifically, the steady flow structure be the spiral passageway from last to bottom that sets up in the water conservancy diversion separator block, spiral passageway include multilayer annular channel, the annular channel end to end of adjacent layer.

Specifically, the spiral channel comprises a spiral channel inlet and a spiral channel outlet, the spiral channel inlet is positioned in the middle of the upper end of the flow guide separation block and corresponds to the inlet hole, and the spiral channel outlet is positioned in the middle of the lower end of the flow guide separation block.

Specifically, the inlet at the upper end of the flow guide separation block is arc-shaped, the radius of the arc is 15mm, and the diameter of the widest part of the flow guide separation block is 76 mm.

The invention has the beneficial effects that: the invention is an improvement of the existing water gap, the bottom of the inlet hole is directly connected with the flow guiding separation block, the distance between the inlet hole and the flow guiding separation block is removed, the impact of molten iron entering from the inlet hole on the flow guiding separation block can be reduced, the flow stabilizing structure is arranged on the flow guiding separation block, the molten iron on two sides of the flow guiding separation block can be dispersed through the flow dividing and stabilizing functions of the flow stabilizing structure, and the water inflow quantity of outlets on two sides of the flow guiding separation block is balanced, so the phenomenon of liquid level fluctuation caused by large water inflow quantity can be further prevented. This use novel improvement that provides can even the mouth of a river effluence, reduce the crystallizer liquid level fluctuation, prevent being drawn into of covering slag, effect that can full play continuous casting.

Drawings

FIG. 1 is a schematic cross-sectional view of a submerged entry nozzle provided in accordance with the present invention;

FIG. 2 is a side cross-sectional view of a submerged entry nozzle provided in the present invention;

FIG. 3 is a schematic sectional view of a submerged entry nozzle provided in embodiment 1;

FIG. 4 is a schematic sectional view of a submerged entry nozzle according to embodiment 2;

FIG. 5 is a schematic cross-sectional view of a flow guiding and separating block of a submerged nozzle provided in embodiment 3.

1 same diameter part, 2 first diameter-changing part, 3 inlet hole, 4 second diameter-changing part, 5 diversion separation block,

6 steady flow holes, 7 steady flow branch holes, 8 steady flow vertical holes, 9 spiral channels, 10 spiral channel inlets,

11 spiral channel outlet.

Detailed Description

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and the detailed description.

Fig. 1 and 2 show a schematic cross-sectional structure and a schematic side cross-sectional structure of an immersion nozzle provided by the present invention, which includes a nozzle body, the nozzle body includes a bowl opening, a same diameter portion 1, a first diameter portion 2 and a second diameter portion 4, which are sequentially connected from top to bottom, a flow guiding separation block 5 is disposed in the second diameter portion 4, an inner wall of the same diameter portion 1 defines an inlet hole 3, the inlet hole 3 extends to the bottom of the first diameter portion 2 and is connected with the flow guiding separation block 5, the upper portion of the flow guiding separation block 5 abuts against the bottom of the inlet hole inside the first diameter portion 2, a flow stabilizing structure is disposed on the flow guiding separation block 5, and an outlet of the inlet hole 3 is in an inverted trapezoid shape.

Example 1

Fig. 3 is a schematic cross-sectional view of the submerged nozzle provided in this embodiment, the flow stabilizing structure of the submerged nozzle is a flow stabilizing hole 6, the flow stabilizing hole 6 horizontally penetrates through the flow guiding separation block 5, and the flow stabilizing hole 6 is located at the middle lower portion of the flow guiding separation block 5. The hole diameters of the outlets at the two ends of the flow stabilizing hole 6 are larger than the hole diameter of the middle part, and the flow stabilizing hole 6 horizontally penetrates through the flow guide separation block 5.

In the embodiment, the bottom of the inlet hole 3 is directly connected with the flow guide separation block 5, the flow stabilizing hole 6 is formed in the flow guide separation block, molten steel is directly divided by the flow guide separation block 5 when the molten steel is left from the inlet hole 3, and the flow stabilizing hole 6 is formed in the flow guide separation block 5, so that the condition that the flow rate of the molten steel is unbalanced at the outlet of a water gap is avoided, the fluctuation of the liquid level of a crystallizer is reduced, the outflow of the water gap can be uniform, the rolling-in of protective slag is prevented, and the continuous casting effect can be fully exerted.

Example 2

As shown in fig. 4, which is a schematic cross-sectional structure view of the submerged nozzle provided in the embodiment, the flow stabilizing structure disclosed in this embodiment includes a vertical flow stabilizing hole 8 disposed in the middle of the flow guiding separation block 5 and a branch flow stabilizing hole 7 connected to the vertical flow stabilizing hole 8, and a diameter of the vertical flow stabilizing hole 8 is greater than a diameter of the branch flow stabilizing hole 7. The number of the steady flow branch holes 7 is at least four, every two steady flow branch holes are symmetrically inclined and extend to the lower side of the flow guide separation block 5, and the outlets of the steady flow branch holes 7 are arranged on the side edge of the lower part of the flow guide separation block 5.

In this embodiment, the bottom of the inlet hole 3 is directly connected with the flow guide separation block 5, the flow stabilizing structure comprises a flow stabilizing vertical hole 6 arranged in the middle of the flow guide separation block 5 and a flow stabilizing branch hole 7 connected with the flow stabilizing vertical hole 6, the flow guide separation block 5 is flat, molten steel is directly shunted through the flow guide separation block 5 when being left from the inlet hole, the molten steel is shunted along the flow stabilizing vertical hole 6 inside the flow guide separation block 5, the molten steel is prevented from being unevenly separated by the flow guide separation block 5, the condition of unbalanced flow rate is generated at a water gap outlet, the liquid level fluctuation of a crystallizer is reduced, the outflow of the water gap can be equalized, the entrainment of protective slag is prevented, and the continuous casting effect can be fully exerted.

Example 3

As shown in fig. 5, which is a schematic cross-sectional structure view of a flow guiding separation block 5 of an immersion nozzle provided in an embodiment, the flow stabilizing structure in this embodiment is a spiral channel 9 arranged in the flow guiding separation block 5 from top to bottom, the spiral channel 9 includes a plurality of layers of annular channels, and the annular channels of adjacent layers are connected end to end. The spiral channel 9 comprises a spiral channel inlet 10 and a spiral channel outlet 11, the spiral channel inlet 10 is positioned in the middle of the upper end of the flow guide separation block 5 and corresponds to the inlet hole 3, and the spiral channel outlet 11 is positioned in the middle of the lower end of the flow guide separation block 5.

The inlet at the upper end of the diversion separation block 5 is arc-shaped, the radius of the arc is 15mm, and the diameter of the widest part of the diversion separation block 5 is 76 mm.

Spiral channel in this embodiment including spiral channel entry and spiral channel export, the spiral channel entry be located water conservancy diversion separation block upper end middle part and correspond the inlet hole, the spiral channel export be located water conservancy diversion separation block lower extreme middle part, by the inlet hole down the molten steel be the triplex simultaneously by the reposition of redundant personnel, two strands of molten steel disperse from water conservancy diversion separation block both sides, another strand then comes from the inside spiral channel reposition of redundant personnel of separation block, the water inflow of the export of water conservancy diversion separation block both sides has been balanced, consequently further can prevent to appear the undulant phenomenon of liquid level because of the water inflow is big, spiral channel has reduced the impact dynamics of molten steel, be difficult to cause the liquid level when reaching the export undulant. This use novel improvement that provides can even the mouth of a river effluence, reduce the crystallizer liquid level fluctuation, prevent being drawn into of covering slag, effect that can full play continuous casting.

Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims

1. The utility model provides an immersion nozzle, includes the mouth of a river body, the mouth of a river body include from last to down connected gradually the bowl mouth portion, with footpath portion (1), first variable diameter portion (2) and second variable diameter portion (4), second variable diameter portion (4) in set up water conservancy diversion separation block (5), with footpath portion (1) inner wall inject inlet hole (3), its characterized in that, inlet hole (3) extend to the bottom and the water conservancy diversion separation block (5) of first variable diameter portion (2) and be connected, water conservancy diversion separation block (5) upper portion push up the inlet hole bottom of first variable diameter portion (2) inboard, water conservancy diversion separation block (5) on set up the stationary flow structure, inlet hole (3) exit be the shape of falling the ladder.

2. The submerged entry nozzle for continuous casting according to claim 1, characterized in that the flow stabilizing structure is a flow stabilizing hole (6), and the flow stabilizing hole (6) horizontally penetrates through the flow guiding separation block (5).

3. The submerged entry nozzle for continuous casting according to claim 2, characterized in that the flow-stabilizing hole (6) is located in the lower middle portion of the flow-guiding separation block (5).

4. The submerged entry nozzle for continuous casting according to claim 2, characterized in that the orifice diameter of the outlet portion at both ends of the steady flow orifice (6) is larger than the orifice diameter at the middle portion.

5. The submerged nozzle for continuous casting according to claim 1, characterized in that the flow stabilizing structure comprises a flow stabilizing vertical hole (8) arranged in the middle of the flow guiding separation block (5) and a flow stabilizing branch hole (7) connected with the flow stabilizing vertical hole (8), and the diameter of the flow stabilizing vertical hole (8) is larger than that of the flow stabilizing branch hole (7).

6. The submerged entry nozzle for continuous casting according to claim 5, characterized in that the steady flow branch holes (7) are at least four, and two of them are symmetrically inclined and extend to the lower side of the flow guiding separation block (5), and the outlets of the steady flow branch holes (7) are arranged at the lower side of the flow guiding separation block (5).

7. The submerged nozzle for continuous casting according to claim 1, characterized in that the flow stabilizing structure is a spiral channel (9) arranged in the flow guiding separation block (5) from top to bottom, the spiral channel (9) comprises a plurality of layers of annular channels, and the annular channels of adjacent layers are connected end to end.

8. The submerged entry nozzle for continuous casting according to claim 7, characterized in that the spiral channel (9) comprises a spiral channel inlet (10) and a spiral channel outlet (11), the spiral channel inlet (10) is located at the middle of the upper end of the flow guiding and separating block (5) and corresponds to the inlet hole (3), and the spiral channel outlet (11) is located at the middle of the lower end of the flow guiding and separating block (5).

9. The submerged entry nozzle for continuous casting according to claim 1, characterized in that the entrance of the upper end of the flow guide separation block (5) is arc-shaped, the radius of the arc is 15mm, and the diameter of the widest part of the flow guide separation block (5) is 76 mm.