CN101298093A - Entry nozzle for inhibiting dynamic instability of CSP thin slab mold liquid level - Google Patents
Entry nozzle for inhibiting dynamic instability of CSP thin slab mold liquid level Download PDFInfo
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- CN101298093A CN101298093A CNA2008101159363A CN200810115936A CN101298093A CN 101298093 A CN101298093 A CN 101298093A CN A2008101159363 A CNA2008101159363 A CN A2008101159363A CN 200810115936 A CN200810115936 A CN 200810115936A CN 101298093 A CN101298093 A CN 101298093A
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Abstract
The invention discloses a nozzle restraining the dynamic instability of the liquid surface of a CSP sheet billet crystallizer, which pertains to the technical field of continuous casting of the sheet billets, provides two structures of the submerged nozzle which can stabilize the wave of the liquid surface and the internal flow field of the and is applicable to the efficient continuous casting of CSP sheet billet. The nozzle is characterized by adopting a three-hole nozzle structure and a four-hole nozzle structure, can effectively restrain the occurrence of dynastic instability on a liquid surface in the CSP sheet billet crystallizer, thereby providing the stability of the liquid surface fluctuation, the surface velocity and the flow steam movement in the flow field of the crystallizer, being able to eliminating the periodic heavy slag entrapment on the surface; a casting blank adjacent to an even meniscus transfers heat so as to further restrain the occurrence of defects of the casting blank, such as longitudinal crack, etc.
Description
Technical field
The invention belongs to the sheet blank continuous casting technical field, the two kinds of submersed nozzle structures that can stablize liquid fluctuating and crystallizer interior flow field are provided, be applicable to CSP sheet billet high efficiency continuous casting.
Background technology
Flowing of crystallizer molten steel is most important to the influence of slab quality.Narrow and small its complicated funnel-shaped structure and the complicated gate structure of adding of CSP crystallizer internal cavity causes its interior flow field complicated more than flowing of molten steel in the conventional panels billet crystallizer.
People such as E.Torres-alonso utilize 1: 1 water model and Mathematical Modeling that the behavior of flowing of the unstable state in the CSP crystallizer is studied.Discover the flowing instability in the CSP crystallizer that uses under the mouth of a river, bilateral hole, the main embodiment is that periodic fluctuation aggravation can appear in liquid level.(at document: E.Torres-alonso, R.D.Morales, L.G.Demedices, Alfonso
.Flow Dynamics in Thin Slab MoldsDriven by Sustainable Oscillating Jets from the Feeding SEN.ISIJ International, Vol.47 (2007), No.5 puts down in writing among the pp.679.)
People such as A.Ramos-banderas utilize Mathematical Modeling and 1: 2 water model to the wide 940mm of crystallizer, thick 100mm, and flow behavior is studied in the plate slab crystallizer under the mouth of a river, bilateral hole that mouth of a river outlet angle of declination is 15 °.Find that the mouth of a river, bilateral hole Fluid field is easy to generate the bias current phenomenon.(at document: A.Ramos-banderas, R.Sanchez-perez etc.Mathmatical simulation and physical modeling of unsteadyfluid flows in a water model of a slab mold.Metallurgical and materials transactionsB.2004.6 (35): record in 449.)
The author utilizes water model that crystallizer flow field under the mouth of a river, bilateral hole of at present domestic certain CSP of iron company production use is studied.Find that liquid level instability in the CSP crystallizer under the gate structure of bilateral hole has periodically short time motion of melt surface aggravation phenomenon, is referred to as " liquid level dynamic buckling ", as shown in Figure 1.Before the liquid level unstability, surface velocity and liquid fluctuating are very little, the liquid level under-activity; During liquid level unstability attitude, motion of melt surface is too active again, causes periodically violent volume slag.
Produce the main cause of liquid level dynamic buckling phenomenon: the CSP crystallizer internal cavity is narrow and small, the dirty strand of impact depth in the mouth of a river, bilateral hole is darker, dirty strand of powerful whirlpool that carries energy in the formation of crystallizer bottom, two whirlpools produce negative pressuren zone at jet and move up and grow up along jet, whirlpool is grown up simultaneously, and its energy that carries also increases gradually, at last below the bottom, the mouth of a river under the effect of high Reynolds stress, the rapid dissipation of tubulence energy causes due to the rapid increase of backflow.Stream burst instability in the experiment spike crystallizer, the stream thigh of delivery port symmetry its direction in motion process bends, as shown in Figure 2.
Further discover, change technological parameters such as nozzle angles, immersion depth and all can not eliminate CSP mold liquid level dynamic buckling phenomenon.
Therefore, the mouth of a river, bilateral hole also is not suitable for the CSP continuous casting and high efficiency production, and reasonably CSP sheet blank continuous casting gate structure remains to be developed.
Summary of the invention
The object of the invention is to provide can eliminate CSP mold liquid level dynamic buckling phenomenon, and can obtain the efficient CSP continous casting sprue structure of more stable liquid fluctuating and interior flow field.
The present invention is a foundation by water model and Mathematical Modeling, and verifies its reasonability.Process is calculated and repeatedly tests to such an extent that following two kinds of gate structures can effectively suppress liquid level dynamic buckling phenomenon in the CSP crystallizer, and can obtain than reasonable liquid level fluctuation and interior flow field.
The mouth of a river of inhibiting dynamic instability of CSP thin slab mold liquid level is characterized in that adopting three hole gate structures and four hole gate structures.
(1) three hole gate structure: shown in Fig. 3～5.Wherein: A, nozzle angles; B, end perforate upper diameter; B ', end perforate lower diameter; C, block length at the bottom of the mouth of a river; D, mouth of a river total length; E, bottom, the mouth of a river exports the upper edge height to the mouth of a river; F expands the angle; G, the mouth of a river width angle of flare; D1, top, mouth of a river external diameter; D2, top, mouth of a river internal diameter; D3, the filling pipe end external diameter; R1, outlet upper wall rounded corner radius; R2, outlet block chamfer radius; I, following mouth of a river outer wall thickness; J, following mouth of a river inner wall thickness; K, outlet upper edge outer wall thickness; H1, the filling pipe end reinforcement; H2, circle inner-diameter portion whose length; H3, filling pipe end thick wall part height.Size range: A, 50～70 °; B, φ 22～φ 30; B ', φ 30～φ 35; C, 75～85mm; D, 1045～1060mm; E, 132～138mm; E1,80～90; F, 9～12 °; G, 4～5 °; D1, φ 145～φ 155; D2, φ 75～φ 80; D3, φ 118～φ 126; R1,14R～18R; R2,15R～20R; I, 64～70mm; J, 20～28mm; K, 78～85mm; H1,125～130mm; H2,315～320mm; H3,25～30mm.
Three hole gate structures can disperse a mouth of a river stream burst intensity, carry and move the generation that can suppress liquid level dynamic buckling phenomenon on the energy thereby suitable bottom outlet structure can effectively suppress vortex that side flow forms, form reasonably dual reflux flow field.Through calculating and experimental verification, three hole gate structures of the mouth of a river, bilateral hole bottom opening can effectively suppress liquid level dynamic buckling phenomenon,
(2) four hole gate structures.Four hole gate structure schematic diagrames are shown in Fig. 7～10, and filling pipe end structure and three hole gate structure d1 in the four hole gate structures, d2, d3, H1, H2, H3, D, G part are identical, and head construction is: L, block length at the bottom of the mouth of a river; M, the bottom outlet spacing; N, bottom outlet length; O, the bottom outlet width; P, following mouth of a river outer wall thickness; Q, following mouth of a river STH inner chamber thickness; L, 165～175mm; M, 38～45mm; N, 38～42mm; O, 20～28mm; P, 65～75mm; Q, 25～30mm.
Four hole gate structures can disperse a mouth of a river stream burst intensity, and the part that effectively prevents the flow field self-energy is assembled and moved, thereby the crystallizer flow field is more stable.Experimental results show that invention gained four hole gate structures can effectively eliminate liquid level dynamic buckling phenomenon, form stable going up and reflux, liquid fluctuating rationally, stable.
The invention has the advantages that: can effectively suppress liquid level dynamic buckling phenomenon generation in the CSP thin slab mold, liquid fluctuating and surface velocity are stable, a stream strand motion stabilization in the crystallizer flow field.Flow field, the mouth of a river, three holes as shown in Figure 6, the transient state liquid fluctuating is as shown in figure 12; Under the mouth of a river, four holes crystallizer device flow field as shown in figure 11, the transient state liquid fluctuating is as shown in figure 13; Can eliminate the periodically serious volume slag of liquid level; Evenly strand conducts heat near the meniscus, and then suppresses the generation of defects such as longitudinal crack of strand.
Description of drawings
The transient state fluctuation characteristic of liquid level under the gate structure of Fig. 1 bilateral hole.
Spike stream burst motion state under the gate structure of Fig. 2 bilateral hole.
Fig. 3 invention gained can effectively suppress three hole gate structure front views of liquid level dynamic buckling phenomenon.Wherein: A, 50～70 °; B, φ 22～φ 30; B ', φ 30～φ 35; C, 75～85mm; D, 1045～1060mm; E, 132～138mm; E1,80～90; F, 9～12 °; G, 4～5 °; D1, φ 145～φ 155; D2, φ 75～φ 80; D3, φ 118～φ 126; R1,14R～18R; R2,15R～20R.
Fig. 4 invention gained can effectively suppress three hole gate structure vertical views of liquid level dynamic buckling phenomenon.
Fig. 5 invention gained can effectively suppress a gate structure left side, the three holes cutaway view of liquid level dynamic buckling phenomenon.Wherein: I, 64～70mm; J, 20～28mm; K, 78～85mm; H1,125～130mm; H2,315～320mm; H3,25～30mm.
Stream burst motion state in the CSP crystallizer flow field under Fig. 6 three hole gate structures.As seen, the crystallizer flow field is symmetrical under the three hole gate structures.
Fig. 7 invention gained can effectively suppress the mouth of a river, the four holes head construction figure of liquid level dynamic buckling phenomenon.Wherein: L, 165～175mm; M, 38～45mm; N, 38～42mm; O, 20～28mm;
Fig. 8 invention gained can effectively suppress the mouth of a river, the four holes graphics of liquid level dynamic buckling phenomenon.
Fig. 9 invention gained can effectively suppress upper end, the mouth of a river, the four holes vertical view of liquid level dynamic buckling phenomenon.
Figure 10 invention gained can effectively suppress bottom, the mouth of a river, the four holes upward view of liquid level dynamic buckling phenomenon.Wherein: P, 65～75mm; Q, 25～30mm; Other size the same (Fig. 3).
Stream burst motion state in the CSP crystallizer flow field under Figure 11 four hole gate structures.As seen, the crystallizer flow field is symmetrical under the four hole gate structures.
Liquid level momentary fluctuation in the CSP crystallizer under the mouth of a river, three holes during Figure 12 water model experiment pulling rate 5.0m/min.(crystallizer width 1200mm, mouth of a river immersion depth 250mm)
Instantaneous liquid fluctuating in the CSP crystallizer of the mouth of a river, four holes during Figure 13 water model experiment pulling rate 5.0m/min.(crystallizer width 1200mm, mouth of a river immersion depth 250mm)
The specific embodiment
Field experiment has been carried out at the mouth of a river, three holes and the mouth of a river, four holes to above invention on certain CSP of iron company production line at home.Wherein: A, 55 °; B, φ 30; B ', φ 35; C, 82mm; D, 1060mm; E, 138mm; F, 9 °; G, 5 °; H, φ 118; I, 27mm; J, 65mm; K, 82mm; L, 168mm; M, 40mm; N, 38mm; O, 21mm.
Crystallizer width 1200mm, thickness 60mm, (4.5～5.0m/min) casting ZJ330 steel processes are smooth, liquid level stabilizing under the conventional pulling rate.During pulling rate 4.8m/min, the vertical diverse location of strand is materialsed and is carried out large-scale inclusion analysis, and large-scale field trash is less in the strand, average 4.5mg/10kg under the mouth of a river, three holes, average 5.2mg/10kg under the mouth of a river, four holes, and in strand throwing direction distribution uniform, illustrate serious volume slag does not take place.The longitudinal crack incidence of using the invention mouth of a river, three holes strand under the same process condition is reduced to 2.4% by original 9%; When using the mouth of a river, four holes, the longitudinal crack incidence of strand is reduced to 2.6% by original 9%.
Claims (2)
1. the mouth of a river of inhibiting dynamic instability of CSP thin slab mold liquid level is characterized in that adopting three hole gate structures or four hole gate structures; In the three hole gate structures: A, nozzle angles; B, end perforate upper diameter; B ', end perforate lower diameter; C, block length at the bottom of the mouth of a river; D, mouth of a river total length; E, bottom, the mouth of a river exports the upper edge height to the mouth of a river; F expands the angle; G, the mouth of a river width angle of flare; D1, top, mouth of a river external diameter; D2, top, mouth of a river internal diameter; D3, the filling pipe end external diameter; R1, outlet upper wall rounded corner radius; R2, outlet block chamfer radius; I, following mouth of a river outer wall thickness; J, following mouth of a river inner wall thickness; K, outlet upper edge outer wall thickness; H1, the filling pipe end reinforcement; H2, circle inner-diameter portion whose length; H3, filling pipe end thick wall part height; Size range: A, 50～70 °; B, φ 22～φ 30; B ', φ 30～φ 35; C, 75～85mm; D, 1045～1060mm; E, 132～138mm; E1,80～90; F, 9～12 °; G, 4～5 °; D1, φ 145～φ 155; D2, φ 75～φ 80; D3, φ 118～φ 126; R1,14R～18R; R2,15R～20R; I, 64～70mm; J, 20～28mm; K, 78～85mm; H1,125～130mm; H2,315～320mm; H3,25～30mm.
2. the mouth of a river of 1. inhibiting dynamic instability of CSP thin slab mold liquid level according to claim 1 is characterized in that adopting four hole gate structures; Filling pipe end structure and three hole gate structure d1 in the four hole gate structures, d2, d3, H1, H2, H3, D, G part are identical, and head construction is: L, block length at the bottom of the mouth of a river; M, the bottom outlet spacing; N, bottom outlet length; 0, the bottom outlet width; P, following mouth of a river outer wall thickness; Q, following mouth of a river STH inner chamber thickness; L, 165～175mm; M, 38～45mm; N, 38～42mm; 0,20～28mm; P, 65～75mm; Q, 25～30mm.
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| CN2008101159363A CN101298093B (en) | 2008-06-30 | 2008-06-30 | Entry nozzle for inhibiting dynamic instability of CSP thin slab mold liquid level |
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| CN2008101159363A CN101298093B (en) | 2008-06-30 | 2008-06-30 | Entry nozzle for inhibiting dynamic instability of CSP thin slab mold liquid level |
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| CN101298093A true CN101298093A (en) | 2008-11-05 |
| CN101298093B CN101298093B (en) | 2010-08-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102834206A (en) * | 2010-01-18 | 2012-12-19 | 朝鲜耐火株式会社 | Immersed nozzle for casting and continuously casting apparatus including same |
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2008
- 2008-06-30 CN CN2008101159363A patent/CN101298093B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102834206A (en) * | 2010-01-18 | 2012-12-19 | 朝鲜耐火株式会社 | Immersed nozzle for casting and continuously casting apparatus including same |
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| CN101298093B (en) | 2010-08-11 |
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Granted publication date: 20100811 Termination date: 20130630 |