CN110773731A - Improve immersion side nozzle for continuous casting in crystallizer flow field - Google Patents
Improve immersion side nozzle for continuous casting in crystallizer flow field Download PDFInfo
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- CN110773731A CN110773731A CN201911089402.2A CN201911089402A CN110773731A CN 110773731 A CN110773731 A CN 110773731A CN 201911089402 A CN201911089402 A CN 201911089402A CN 110773731 A CN110773731 A CN 110773731A
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- inclination angle
- side hole
- main side
- crystallizer
- flow field
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
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- Mechanical Engineering (AREA)
- Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
- Continuous Casting (AREA)
Abstract
A submerged side nozzle for continuous casting for improving a flow field of a crystallizer is arranged in the crystallizer and comprises main side holes which are symmetrically arranged, the cross section of each main side hole is rectangular or square, the upper surface of each main side hole is provided with an upper inclination angle a1, the lower surface of each main side hole is provided with a lower inclination angle a2, the degree of the upper inclination angle is smaller than that of the lower inclination angle, and the difference between the upper inclination angle and the lower inclination angle is 3-5 degrees; and an auxiliary side hole is arranged at the upper part of the main side hole, and the flow area of the auxiliary side hole is 1/40-1/10 of the flow area of the main side hole. The invention has the following beneficial effects: 1. the auxiliary side hole is arranged, and part of molten steel flows out of the auxiliary side hole, so that the heat output of the upper part is improved, the upper reflux heat transfer of the molten steel is improved, and a good foundation is provided for increasing the insertion depth of the submerged nozzle; 2. the upper inclination angle and the lower inclination angle of the main side hole adopt different angles, and the upper inclination angle is smaller than the lower inclination angle, so that the upward backflow of molten steel flow is strengthened, the heat transfer of the upward backflow molten steel is further improved, and a thermal flow field is optimized.
Description
Technical Field
The invention relates to a device for optimizing a crystallizer molten steel flow field in the pouring process of a continuous casting machine, in particular to an immersion type side water spraying port for improving the crystallizer flow field.
Background
In continuous casting production, the immersion type water gap insertion depth is an important production control parameter for ensuring the quality of a casting blank in the continuous casting and continuous casting process. In the slab continuous casting production process, because the liquid level of the tundish has a certain height, when molten steel enters the crystallizer from the main side hole of the submerged nozzle, molten steel flow has a certain speed and angle, and upper reflux and lower reflux are formed after the molten steel impacts the narrow surface of the crystallizer. The lower reflux forms a certain impact depth, if the impact depth is too deep, a high-temperature area in the crystallizer moves downwards, the melting of the protective slag is weakened and influenced, and simultaneously, the solidified blank shell is thinned and even secondary melting is possibly caused, the leakage probability is increased, and impurities are not easy to float. And if the impact depth is too small, the liquid level fluctuation is severe, the slag rolling phenomenon is generated, the number of inclusions is increased, the quality of the continuous casting billet is seriously influenced, the continuous casting drawing speed cannot be effectively improved, and the yield is influenced. Therefore, the insertion depth has contradiction. In the prior production, reasonable control of the impact depth is particularly important for improving the internal flow field of the crystallizer, but the problems of the two aspects cannot be solved at the same time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the submerged side nozzle for continuous casting, which has obvious action effect and can improve the flow field of the crystallizer.
The problem of the invention is realized by the following technical scheme:
a submerged side nozzle for continuous casting for improving a flow field of a crystallizer is arranged in the crystallizer and comprises main side holes which are symmetrically arranged, the cross section of each main side hole is rectangular or square, the upper surface of each main side hole is provided with an upper inclination angle a1, the lower surface of each main side hole is provided with a lower inclination angle a2, the degree of the upper inclination angle is smaller than that of the lower inclination angle, and the difference between the upper inclination angle and the lower inclination angle is 3-5 degrees;
and an auxiliary side hole is arranged at the upper part of the main side hole, and the flow area of the auxiliary side hole is 1/40-1/10 of the flow area of the main side hole.
The submerged side nozzle for continuous casting for improving the crystallizer flow field has the upper inclination angle degree not less than 10 degrees and the lower inclination angle degree not more than 20 degrees.
In the submerged side nozzle for continuous casting for improving the flow field of the crystallizer, the axis of the auxiliary side hole is vertical or inclined upwards relative to the axis of the side nozzle, and the inclination angle a3 is not more than 10 degrees.
The submerged side nozzle for improving the crystallizer flow field for continuous casting has the advantages that the auxiliary side hole is cylindrical or conical, and the conical angle of the conical auxiliary side hole is 5-8 degrees.
The distance from the axis of the auxiliary side hole to the axis of the main side hole is 20-50 mm.
The submerged side nozzle structure is improved aiming at solving the problem of optimizing the molten steel flow field of the crystallizer, and has the following beneficial effects: 1. the auxiliary side hole is arranged, and part of molten steel flows out of the auxiliary side hole, so that the heat output of the upper part is improved, the upper reflux heat transfer of the molten steel is improved, and a good foundation is provided for increasing the insertion depth of the submerged nozzle; 2. the upper inclination angle and the lower inclination angle of the main side hole adopt different angles, and the upper inclination angle is smaller than the lower inclination angle, so that the upward backflow of molten steel flow is strengthened, the heat transfer of the upward backflow molten steel is further improved, and a thermal flow field is optimized. The design of the invention optimizes the heat distribution of the upper flow field, thereby further increasing the insertion depth, promoting the high drawing speed and increasing the continuous casting billet yield.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a schematic structural view of a first embodiment of the present invention;
FIG. 2 is a schematic structural view of a second embodiment of the present invention;
FIG. 3 is a schematic structural view of a third embodiment of the present invention;
fig. 4 is a schematic structural view of a fourth embodiment of the present invention.
The reference numbers in the figures denote: 1. a submerged side nozzle 2, an auxiliary side hole 3 and a main side hole.
Detailed Description
Referring to fig. 1, the submerged side nozzle for continuous casting for improving the flow field of the crystallizer of the present invention is arranged in the crystallizer, and comprises symmetrically arranged main side holes 3, the cross section of which is square or rectangular. An important improvement of the invention is that the upper surface of the main side hole has an upper inclination angle a1 and the lower surface has a lower inclination angle a2, the upper inclination angle is smaller than the lower inclination angle, and the difference between the upper inclination angle and the lower inclination angle is 3-5 degrees. Wherein the degree of the upper inclination angle is not less than 10 degrees, and the degree of the lower inclination angle is not more than 20 degrees. The main side holes are provided with different upper inclination angles and lower inclination angles, and the upper inclination angles are smaller than the lower inclination angles, so that when molten steel flows out of the two main side holes, the molten steel is promoted to be filled into the crystallizer in a fan-shaped expansion mode to form larger upper reflux because the upper inclination angles are smaller than the lower inclination angles, the heat transfer of the upper reflux molten steel is improved, and a heat flow field is optimized. The design of a non-parallel inclination angle structure slows down the strong impact of the molten steel stream on the side surface of the crystallizer.
Still referring to fig. 1, another important improvement of the present invention is to provide secondary lateral holes 2 respectively in the upper portions of the two primary lateral holes, the secondary lateral holes having flow areas 1/40-1/10 of the flow areas of the primary lateral holes. The auxiliary side hole is arranged, so that a small part of molten steel can flow out of the auxiliary side hole, the heat output of the upper part is improved, the upward backflow heat transfer of the molten steel is improved, and a good foundation is provided for increasing the insertion depth of the submerged nozzle. The size of the auxiliary side hole is far smaller than that of the main side hole, and the heat supply strength of the upper part of the crystallizer is further enhanced.
Fig. 1 shows a first embodiment of the invention in which the secondary port axis is perpendicular to the axis of the side nozzle.
Figure 2 shows a second embodiment of the invention in which the secondary port axis is inclined upwardly with respect to the axis of the side nozzle, the angle of inclination a3 being no greater than 10 °. The secondary side hole is designed according to the second embodiment, so that the molten steel trickle upward spraying effect is better, and the heat supplement is quicker and more sufficient.
FIG. 3 shows a third embodiment of the present invention, in which the secondary side hole is a conical hole with a decreasing diameter from outside to inside, and the conical hole of the secondary side hole can make molten steel thin flow form diffusion flow when being sprayed out, so that the area for strengthening upper heat supply is larger.
Fig. 4 shows a fourth embodiment of the invention in which the secondary side orifices are conical orifices and the axis of the secondary side orifices is inclined upwardly with respect to the axis of the side nozzle by an angle of not more than 10 °. The fourth embodiment combines the advantages of the second and third embodiments, and has the best effect.
One specific example is provided below: the main side hole of the submerged side nozzle is of a rectangular section, the upper inclination angle a1 of the main side hole is 14 degrees, and the lower inclination angle a2 of the submerged side nozzle is 18 degrees. Be equipped with vice side opening on the upper portion of main side hole, the distance of vice side opening axis to main side hole axis is 30 millimeters, and vice side opening is cylindrical hole, and the through flow area of vice side opening is 1/20 of main side opening, and the axis of vice side opening inclines for the axis of immersion side nozzle, and inclination is 7.
Claims (5)
1. The utility model provides an improve immersion side nozzle for continuous casting in crystallizer flow field, sets up in the crystallizer, including the main side opening that the symmetry set up, its characterized in that: the section of the main side hole is rectangular or square, the upper surface of the main side hole is provided with an upper inclination angle a1, the lower surface of the main side hole is provided with a lower inclination angle a2, the degree of the upper inclination angle is smaller than that of the lower inclination angle, and the difference between the upper inclination angle and the lower inclination angle is 3-5 degrees;
and an auxiliary side hole is arranged at the upper part of the main side hole, and the flow area of the auxiliary side hole is 1/40-1/10 of the flow area of the main side hole.
2. The submerged side nozzle for continuous casting for improving the flow field of the crystallizer of claim 1, wherein: the degree of the upper inclination angle is not less than 10 degrees, and the degree of the lower inclination angle is not more than 20 degrees.
3. The submerged side nozzle for continuous casting for improving the flow field of the crystallizer of claim 2, wherein: the axis of the auxiliary side hole is vertical or inclined upwards relative to the axis of the side water injection port, and the inclination angle a3 is not more than 10 degrees.
4. The submerged side nozzle for continuous casting for improving the flow field of the crystallizer of claim 3, wherein: the secondary side hole is cylindrical or conical, and the conical angle of the conical secondary side hole is 5-8 degrees.
5. The submerged side nozzle for continuous casting for improving the flow field of the crystallizer of claim 4, wherein: the distance from the axis of the auxiliary side hole to the axis of the main side hole is 20-50 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911089402.2A CN110773731A (en) | 2019-11-08 | 2019-11-08 | Improve immersion side nozzle for continuous casting in crystallizer flow field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911089402.2A CN110773731A (en) | 2019-11-08 | 2019-11-08 | Improve immersion side nozzle for continuous casting in crystallizer flow field |
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| Publication Number | Publication Date |
|---|---|
| CN110773731A true CN110773731A (en) | 2020-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911089402.2A Pending CN110773731A (en) | 2019-11-08 | 2019-11-08 | Improve immersion side nozzle for continuous casting in crystallizer flow field |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111496212A (en) * | 2020-06-08 | 2020-08-07 | 洛阳理工学院 | Automatic control method and system for liquid level of tundish |
| CN112643007A (en) * | 2020-11-23 | 2021-04-13 | 首钢集团有限公司 | Continuous casting method for reducing large-size inclusions on surface layer of aluminum-containing steel casting blank |
-
2019
- 2019-11-08 CN CN201911089402.2A patent/CN110773731A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111496212A (en) * | 2020-06-08 | 2020-08-07 | 洛阳理工学院 | Automatic control method and system for liquid level of tundish |
| CN111496212B (en) * | 2020-06-08 | 2021-09-07 | 洛阳理工学院 | Automatic control method and system for liquid level of tundish |
| CN112643007A (en) * | 2020-11-23 | 2021-04-13 | 首钢集团有限公司 | Continuous casting method for reducing large-size inclusions on surface layer of aluminum-containing steel casting blank |
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