CN115921810A - Submerged nozzle for improving symmetry of flow field in slab continuous casting crystallizer - Google Patents
Submerged nozzle for improving symmetry of flow field in slab continuous casting crystallizer Download PDFInfo
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- CN115921810A CN115921810A CN202211672414.XA CN202211672414A CN115921810A CN 115921810 A CN115921810 A CN 115921810A CN 202211672414 A CN202211672414 A CN 202211672414A CN 115921810 A CN115921810 A CN 115921810A
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Abstract
The invention discloses an immersion nozzle for improving the symmetry of a flow field in a slab continuous casting crystallizer, relates to the technical field of steelmaking continuous casting, and solves the technical problem of liquid level slag entrapment caused by asymmetric flow due to mutual collision of steel flow strands in the circulation area of the crystallizer. Immersion nozzle includes mouth of a river main part and two division boards, and the mouth of a river main part includes mouth of a river inner chamber and two side openings, and two division boards set up respectively in the both sides of mouth of a river main part, division board along the third direction with third direction vertically first direction extension distribute, division board one end on the first direction and the outer peripheral edge connection of mouth of a river main part. Therefore, when the molten steel flow flows in the circulation area on the crystallizer, the molten steel flow is isolated along the thickness direction of the crystallizer, the momentum exchange between the molten steel flow is inhibited, the symmetry of the flow field in the crystallizer is improved, the liquid level fluctuation and the formation of vortex on the upper surface of the crystallizer are reduced, and the liquid level slag entrapment of the crystallizer is reduced.
Description
Technical Field
The invention relates to the technical field of steelmaking continuous casting, in particular to an immersion type water gap for improving the symmetry of a flow field in a slab continuous casting crystallizer.
Background
In the steel-making process, attention needs to be paid to the surface defects of the continuous casting billet caused by slag entrapment on the liquid surface of the crystallizer, and the symmetry of a flow field in the crystallizer is improved. Double circulation is considered as a good flow state in the crystallizer, an upper circulation area and a lower circulation area are formed, molten steel streams existing in the upper circulation area collide with each other, asymmetry of molten steel flow is increased, vortexes are formed on the top surface of the crystallizer, and liquid level fluctuation is aggravated to cause slag entrapment. Therefore, there is a need to optimize the flow of molten steel in the annulus of the crystallizer.
Disclosure of Invention
Based on the above problem, the application provides an improve immersion nozzle of flow field symmetry in slab continuous casting crystallizer.
The utility model provides an improve immersion nozzle of flow field symmetry in slab continuous casting crystallizer, including mouth of a river main part and two division boards, the mouth of a river main part includes along the mouth of a river inner chamber that length direction distributes and is located relative both sides and be close to terminal two side openings, the length direction of mouth of a river main part is the third direction, side opening and mouth of a river inner chamber intercommunication, the contained angle that is formed by the directional terminal direction in top in play liquid direction and the mouth of a river main part that the side opening formed is the acute angle, two division boards set up respectively in the both sides of mouth of a river main part, the division board along the third direction and with third direction vertically first direction extension distribution, the division board is connected with the outer peripheral edge of mouth of a river main part in the one end of first direction, there is a line simultaneously the line of symmetry of side opening and division board in the projection of third direction, at least one buffering hole has been seted up to the division board, the buffering hole along with first direction and third direction vertically second direction setting.
In some embodiments, the submerged entry nozzle is used in a mold, and the ratio of the dimension of the partition plate in the first direction to the dimension of the mold in the first direction is controlled to be in the range of 0.3 to 0.4.
In some embodiments, the ratio of the dimension of the partition plate in the first direction to the dimension of the mold in the first direction is 0.35.
In some embodiments, when the submerged entry nozzle is used in a mold, the length of the mold is in a third direction, the width of the mold is in a first direction, and the thickness of the mold is in a second direction.
In some embodiments, the buffer holes are circular holes.
In some embodiments, the partition plate is provided with at least two buffer holes sequentially spaced in the first direction.
In some embodiments, both ends of the separator plate in the third direction include a lower edge near the distal end and an upper edge remote from the distal end;
the buffer hole is the round hole setting, and the diameter of buffer hole is 40mm, and two adjacent buffer holes are at a distance of 110mm, and the buffer hole is at a distance of 125mm with last reason, and the buffer hole is at a distance of 55mm with the lower edge, and the both ends of division board on the first direction are at a distance of 130mm with the buffer hole that is close separately.
In some embodiments, the dimension of the separator plate in the second direction is 20mm.
In some embodiments, the expanded shape of all the cross sections of the side holes distributed along the circumference of the nozzle body is rectangular.
In some embodiments, the angle between the axial direction of the side hole and the first direction is controlled to be in the range of 15 ° to 40 °.
The beneficial effects of this application are as follows: the submerged nozzle for improving the symmetry of a flow field in a slab continuous casting crystallizer forms double circulation in the crystallizer through a nozzle inner cavity and two side holes of a nozzle main body, and through an isolation plate which is arranged in a first direction and a third direction in an extending way, when molten steel flows in a circulation area on the crystallizer, isolation occurs along the thickness direction of the crystallizer (namely, the second direction which is vertical to the first direction and the third direction), momentum exchange between the molten steel flows is inhibited, and the molten steel on one side with a high liquid level flows to the direction with the low liquid level through a buffer hole, so that the liquid level is stabilized and the buffer effect is achieved; on the whole, the symmetry of the flow field in the crystallizer is improved, the liquid level fluctuation and the formation of vortex on the upper surface of the crystallizer are reduced, and the technical problem of liquid level slag entrapment caused by asymmetric flow due to mutual collision of steel liquid flow strands in the circulation area of the crystallizer is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
Fig. 1 is a schematic structural view of an immersion nozzle for improving symmetry of a flow field in a slab continuous casting crystallizer provided by the present application;
FIG. 2 is a schematic view of a submerged nozzle provided in the present application for improving symmetry of a flow field in a slab continuous casting mold, projected along a second direction;
fig. 3 is a schematic view of a submerged nozzle provided by the present application for improving symmetry of a flow field in a slab continuous casting mold projected along a first direction;
FIG. 4 is a schematic view of a submerged nozzle provided in the present application for improving symmetry of a flow field in a slab continuous casting mold, projected in a third direction;
the attached drawings are marked as follows: 10-submerged nozzle, 100-nozzle main body, 110-nozzle inner cavity, 120-side hole, 200-partition plate, 210-buffer hole, 221-lower edge, 222-upper edge, 310-first direction, 320-second direction, 330-third direction, and 20-crystallizer.
Detailed Description
The embodiment of the application provides the submerged nozzle for improving the symmetry of the flow field in the slab continuous casting crystallizer, and solves the technical problem that liquid level slag entrapment is caused by asymmetric flow due to mutual collision of steel flow strands in the circulation area of the crystallizer in the related technology.
In order to solve the technical problems, the general idea of the embodiment of the present application is as follows:
the utility model provides an improve immersion nozzle of flow field symmetry in slab continuous casting crystallizer, including mouth of a river main part and two division boards, the mouth of a river main part includes along the mouth of a river inner chamber that length direction distributes and is located relative both sides and be close to terminal two side openings, the length direction of mouth of a river main part is the third direction, side opening and mouth of a river inner chamber intercommunication, the contained angle that is formed by the directional terminal direction in top in play liquid direction and mouth of a river main part that the side opening formed is the acute angle, two division boards set up respectively in the both sides of mouth of a river main part, the division board along the third direction and with third direction vertically first direction extension distribution, the division board is connected with the outer peripheral edge of mouth of a river main part in the one end of first direction, there is a line simultaneously for the symmetry line of side opening and division board in the projection of third direction, at least one buffering hole has been seted up to the division board, the buffering hole is along with first direction and third direction vertically second direction setting.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Example 1
Referring to fig. 1 to 4, the embodiment provides a submerged nozzle 10 for improving symmetry of a flow field in a slab continuous casting mold, so as to solve a technical problem of liquid level slag entrapment caused by asymmetric flow due to collision of molten steel streams in a circulation region of the mold 20 under a condition that the mold 20 has a double circulation flow state.
It should be pointed out that, at present, the influence factors of the molten steel flow in the crystallizer mainly include the internal geometry of the submerged nozzle, the submerged depth of the nozzle, the casting section, the pulling rate and the blowing amount, and in the casting process, the flow behavior of the molten steel in the area of the circulation zone in the crystallizer is difficult to control under the conditions of fixing the casting parameters, ensuring the centering of the nozzle and no nodulation of the nozzle.
As shown, the related description of the present embodiment relates to a first direction 310, a second direction 320 and a third direction 330, which are perpendicular to each other, to form a spatial coordinate system. Further, the third direction 330 is a longitudinal direction of the nozzle body 100, and the first direction 310 and the second direction 320 are horizontal directions when the submerged nozzle 10 is in use.
The submerged entry nozzle 10 provided in this embodiment includes a nozzle body 100, and the nozzle body 100 includes a nozzle inner cavity 110 distributed along a length direction. In order to form double circular flows in the crystallizer 20, the nozzle body 100 further includes two side holes 120 located at opposite sides and near the ends, the side holes 120 are communicated with the nozzle inner cavity 110, the ends of the nozzle body 100 are closed, and the length direction of the nozzle body 100 is a third direction 330; and the included angle formed between the liquid outlet direction formed by the side hole 120 and the direction of the nozzle body 100 from the beginning to the end is defined as an acute angle, if the submerged nozzle 10 shown in fig. 1 is combined with the use state of the mold 20, the side hole 120 can be described as a downward hole with an inclined angle.
Referring to fig. 1 to 4, the submerged entry nozzle 10 further includes two partition plates 200, the two partition plates 200 are respectively disposed at two sides of the nozzle body 100, the partition plates 200 extend along a third direction 330 and a first direction 310 perpendicular to the third direction 330, and the length and height of the partition plates 200 are formed along the first direction 310 and the third direction 330.
One end of each partition plate 200 in the first direction 310 is connected to an outer circumference of the nozzle body 100. Referring to fig. 4, there is a line in the projection of the third direction 330 which is a line of symmetry of the side holes 120 and the insulation plate 200, i.e., the center line in fig. 4, in order to locate the insulation plate 200 at the very center of the thickness range of the mold 20.
Referring to fig. 1, when the submerged nozzle 10 is used in the mold 20, the length of the mold 20 is along the third direction 330, the width of the mold 20 is along the first direction 310, and the thickness of the mold 20 is along the second direction 320.
In the present embodiment, the isolation plate 200 isolates the streams of molten steel in the thickness direction of the crystallizer 20 when the streams of molten steel flow in the annulus of the crystallizer 20, so as to suppress the momentum exchange between the streams of molten steel.
Referring to fig. 1 and 2, the isolation plate 200 is formed with at least one buffer hole 210, and the buffer hole 210 is disposed along a second direction 320. If the submerged nozzle 10 has a nodule, the molten steel in the flow field of the crystallizer 20 may flow asymmetrically, so that the molten steel is higher on one side of the partition plate 200 and lower on the other side; through setting up buffer hole 210, the high molten steel of liquid level passes through buffer hole 210 and flows to the low direction of liquid level, and then plays the effect of stabilizing liquid level, buffering.
Through the submerged nozzle 10 of the embodiment, the symmetry of the flow field in the crystallizer 20 can be improved, the liquid level fluctuation and the formation of the vortex on the upper surface of the crystallizer 20 are reduced, and the technical problem of liquid level slag entrapment caused by asymmetric flow due to mutual collision of steel liquid flow strands in the circulation area of the crystallizer 20 is solved.
In some embodiments, referring to fig. 2, the buffer holes 210 are circular holes.
In some embodiments, the partition plate 200 is provided with at least two buffer holes 210 sequentially spaced along the first direction 310. The shape, number, size, and arrangement of the buffer holes 210 on the partition plate 200 are determined according to the actual application, and the specific shape of the side holes 120 is not excessively limited in this embodiment.
In some embodiments, the ratio of the dimension of the partition plate 200 in the first direction 310 to the dimension of the mold 20 in the first direction 310 is controlled to be in the range of 0.3 to 0.4.
In some embodiments, the ratio of the dimension of the partition plate 200 in the first direction 310 to the dimension of the mold 20 in the first direction 310 is 0.35.
Referring to fig. 2, both ends of the partition board 200 in the third direction 330 include a lower edge 221 near the distal end and an upper edge 222 far from the distal end. In some embodiments, the buffer holes 210 are circular holes, the diameter of the buffer holes 210 is 40mm, two adjacent buffer holes 210 are spaced apart by 110mm, the buffer holes 210 are spaced apart from the upper edge 222 by 125mm, the buffer holes 210 are spaced apart from the lower edge 221 by 55mm, and two ends of the partition plate 200 in the first direction 310 are spaced apart from the nearest buffer holes 210 by 130mm, so that the liquid level fluctuation and the formation of the vortex on the upper surface of the mold can be greatly improved in application.
In some embodiments, the dimension of the separator plate 200 in the second direction 320 is 20mm.
In some embodiments, referring to fig. 1 to 4, all the cross sections of the side holes 120 distributed along the circumferential direction of the nozzle body 100 are rectangular after being developed, and can be generally referred to as rectangular side holes 120.
In some embodiments, the angle between the axial direction of the side hole 120 and the first direction 310 is controlled to be in the range of 15-40 °.
In the case of the example 2, the following examples are given,
by applying the submerged nozzle 10 for improving the symmetry of the flow field in the slab continuous casting mold in the embodiment 1, the embodiment provides a specific implementation condition as follows:
the industrial test is carried out on a slab caster of a certain steel mill, the casting steel grade is IF steel, the tonnage of a tundish is 70 tons, the superheat degree of molten steel of the tundish is 23 ℃, the casting section is 1400mm multiplied by 247mm, the depth of the immersion nozzle 10 inserted into the liquid level of the molten steel is 145mm, the drawing speed is 1.4m/min, and the argon blowing flow is 6NL/min;
in the process of using the submerged entry nozzle 10 of embodiment 1, molten steel enters the mold 20 from the outlet of the side hole 120 of the submerged entry nozzle 10, and the separation plate 200 and the buffer hole 210 of the separation plate 200 smoothly function;
in the casting process, the pin inserting plate is used for continuously inserting and taking molten steel on the upper surface of the crystallizer 20, the liquid levels of the inner arc side and the outer arc side of the crystallizer 20 have no obvious difference after the nozzle is used, and the molten steel flows symmetrically on the left side and the right side of the crystallizer by taking the nozzle as the center;
taking the central plane of the crystallizer in the thickness direction as the center, and the inner arc side and the outer arc side are symmetrical in flow field;
the statistical analysis is carried out on the liquid level fluctuation data after the casting is finished, the liquid level fluctuation is stable after the nozzle is used, and compared with a submerged nozzle without a partition plate, the liquid level fluctuation occupation ratio of 0-1mm is increased to 97.1% from 85.5%, and the liquid level fluctuation occupation ratio of more than 3mm is reduced to 2.5% from 13.2%.
Example 3
By applying the submerged nozzle 10 for improving the symmetry of the flow field in the slab continuous casting mold in the embodiment 1, the embodiment provides a specific implementation condition as follows:
the casting industrial test is carried out on a slab caster of a certain steel plant, the casting steel is hypo-peritectic steel, the tonnage of a tundish is 80 tons, the superheat degree of molten steel of the tundish is 25 ℃, the casting section is 1050mm multiplied by 247mm, continuous casting is carried out at the casting speed of 1.7m/min, and the depth of an immersion nozzle 10 inserted into the liquid level of the steel is 170mm;
and tracking the data of the continuous casting blank and the subsequent cold-rolled sheet surface detection system after the casting is finished, and finding that the slag reduction rate of the cold-rolled sheet coil using the nozzle is reduced to 0.81 percent from 1.63 percent when a conventional submerged nozzle is used.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The utility model provides an improve immersion nozzle of flow field symmetry in slab continuous casting crystallizer which characterized in that, immersion nozzle includes:
the nozzle comprises a nozzle main body, a nozzle cover and a nozzle cover, wherein the nozzle main body comprises a nozzle inner cavity distributed along the length direction and two side holes which are positioned on two opposite sides and close to the tail end, the length direction of the nozzle main body is a third direction, the side holes are communicated with the nozzle inner cavity, and an included angle formed between a liquid outlet direction formed by the side holes and a direction of the nozzle main body from the starting end to the tail end is an acute angle;
two division boards set up respectively in the both sides of mouth of a river main part, the division board is followed the third direction with third direction vertically first direction extends and distributes, the division board is in first direction one end with the outer peripheral edges of mouth of a river main part are connected there is a line simultaneously in the projection of third direction do the side opening with the symmetrical line of division board, at least one buffering hole has been seted up to the division board, the buffering hole along with first direction with third direction vertically second direction sets up.
2. The submerged entry nozzle of claim 1, characterized in that it is used in a crystallizer, and the ratio of the dimension of the partition plate in the first direction to the dimension of the crystallizer in the first direction is controlled in the range of 0.3-0.4.
3. The submerged entry nozzle of claim 2, characterized in that the ratio of the dimension of the partition plate in the first direction to the dimension of the mould in the first direction is 0.35.
4. The submerged entry nozzle of claim 2 or 3, characterized in that, when the submerged entry nozzle is used in the mold, the length of the mold is in the third direction, the width of the mold is in the first direction, and the thickness of the mold is in the second direction.
5. The submerged entry nozzle of claim 1, characterized in that said relief holes are arranged as circular holes.
6. The submerged entry nozzle of claim 1, characterized in that said partition plate is provided with at least two of said relief holes arranged sequentially spaced apart in said first direction.
7. The submerged entry nozzle of claim 6, characterized in that both ends of the partition plate in the third direction comprise a lower edge close to the tip and an upper edge remote from the tip;
the buffer hole is the round hole setting, the diameter of buffer hole is 40mm, adjacent two the buffer hole is 110mm apart from, the buffer hole with go up the reason 125mm apart from, the buffer hole with the lower edge is 55mm apart from, the division board is in both ends on the first direction with be close to separately the buffer hole is 130mm apart from.
8. Submerged entry nozzle according to claim 1 or 7, characterised in that the dimension of said partition plate in said second direction is 20mm.
9. The submerged entry nozzle of claim 1, characterized in that all the cross-sections of the side holes distributed along the circumferential direction of the nozzle body are rectangular in the expanded view.
10. The submerged entry nozzle of claim 1, characterized in that the angle between the axial direction of the side hole and the first direction is controlled to be in the range of 15 ° -40 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211672414.XA CN115921810A (en) | 2022-12-26 | 2022-12-26 | Submerged nozzle for improving symmetry of flow field in slab continuous casting crystallizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211672414.XA CN115921810A (en) | 2022-12-26 | 2022-12-26 | Submerged nozzle for improving symmetry of flow field in slab continuous casting crystallizer |
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| Publication Number | Publication Date |
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| CN115921810A true CN115921810A (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211672414.XA Pending CN115921810A (en) | 2022-12-26 | 2022-12-26 | Submerged nozzle for improving symmetry of flow field in slab continuous casting crystallizer |
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| CN (1) | CN115921810A (en) |
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