CN201760570U - Multi-outlet brake based immersion type water nozzle structure - Google Patents
Multi-outlet brake based immersion type water nozzle structure Download PDFInfo
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- CN201760570U CN201760570U CN2010205011512U CN201020501151U CN201760570U CN 201760570 U CN201760570 U CN 201760570U CN 2010205011512 U CN2010205011512 U CN 2010205011512U CN 201020501151 U CN201020501151 U CN 201020501151U CN 201760570 U CN201760570 U CN 201760570U
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Abstract
The utility model relates to a multi-outlet brake based immersion type water nozzle structure which belongs to the technical field of continuous casting. The structure is characterized in that the top of a main channel of the immersion type water nozzle is provided with an inlet connected with a container containing liquid metal; the lower part of the main channel close to the tail end of the water nozzle is provided with 2-4 pairs of metal liquid outlets with holes on the side surfaces along the spindle direction of the water nozzle; and each pair of outlets are uniformly distributed on the circumferential direction of the main channel. The utility model has the advantages of reducing the impact of the whole flow to an initial solidification billet shell in a crystallizer because the impact speed is greatly reduced after flows on the upper part and the lower part of the water nozzle are combined, and, being beneficial to the quick formation of a broad-surface solidification billet shell, reducing local overheat of the crystallizer, preventing heat strain probably generated by a copper plate, greatly lowering the steel leakage probability, improving the plate billet quality, and reducing the energy consumption and the production cost because the distribution of hot flows in the crystallizer is more uniform.
Description
Technical field
The utility model belongs to the continuous casting technology field, and a kind of submersed nozzle structure based on the multiple exit braking particularly is provided.Be applied to the moulding by casting process of molten steel and other liquid metal.
Background technology
This continuous casting production process of sentencing iron and steel is that background is introduced this design.Continuous casting technology is born in 1840, extensively applies to steel industry in nineteen sixty, surpasses 88% crude steel by 2002 in the world and adopts continuous casting manufacturing technique to obtain.
Crystallizer adopts copper coin to make usually, and its effect is mainly reflected in: 1) cc billet surface quality controller: the performance of crystallizer all plays crucial effect to the production capacity and the slab quality of conticaster; 2) heat transmitter efficiently: the molten steel heat is in time derived, reduce casting blank defect; 3) molten steel purifying device: impel the non-metallic inclusion in the molten steel to float and protected slag absorption removal; 4) molten steel solidification former: molten steel solidifiable therein becomes specific shape.
The continuous casting submersed nozzle has connected tundish and crystallizer, provides passage for molten steel flows.The introducing of submersed nozzle technology improves the problem of molten steel secondary oxidation greatly, make molten steel with under the situation that outside air contacts not immerse crystallizer smoothly, simultaneously, submersed nozzle also has control molten steel liquid form in crystallizer, stablize the molten steel liquid level, avoid effects such as production accident.
Continuous casting billet quality is puzzlement people's a problem always, as face crack, and surface pores, center segregation and large-scale field trash, strand tripe, off-square etc.Eliminate these defectives and depend on the control that molten steel flows and heat transmits in the casting process to a great extent, therefore the control to continuous casting core crystallizer flow field seems particularly important.
Molten steel is mobile very important to slab quality in the crystallizer.There are three representative regions in the tradition FLUID FLOW INSIDE CONTINUOUS SLAB CASTING MOLD: fluerics, the mouth of a river, last recirculating zone and following recirculating zone.The size of its recirculating zone and intensity depend on the width of crystallizer, pulling rate, mouth of a river immersion depth, technological parameters such as mouth of a river blowing angle.The control in crystallizer flow field is mainly reflected in the control to fluerics, the mouth of a river under the high pulling rate condition.Mouth of a river effluxvelocity increases with the increase of pulling rate, current slab pulling rate has surpassed 1.8m/min, certainly will cause the molten steel effluxvelocity excessive, and what cause that most of molten steel focuses on the crystallizer side a bit carries out exchange heat, therefore, brought great heat load to copper plate of crystallizer.In addition, too high cooling water boiling in the crystallizer water seam, the impurity deposition formation incrustation scale in the cooling water of also might causing of local temperature, reduce thermal conductivity greatly, and making the flow of cooling water inequality, this phenomenon is particularly evident near the crystallizer meniscus, also is the main cause that forms casting blank defect.
Therefore, be to solve slab quality to the control in crystallizer flow field, guarantee the key of the efficient direct motion of continuous casting.The design of submersed nozzle has bigger influence to molten steel mobile in crystallizer, reasonably submersed nozzle is to improve molten steel flow condition in the crystallizer, reduce the impact depth of beam, the heat that disperses beam to bring into impels crystallizer to form even base shell, promotes the important means of slag inclusion thing come-up.Yet, more than the use at traditional mouth of a river also expose some shortcomings, especially along with the continuous lifting of continuous casting pulling rate.The design at the tradition mouth of a river is easy to cause molten steel stream strand to concentrate too much on the side, and hot localised points is distributed in the solidified shell inboard of crystallizer sidewall, simultaneously, if jet area exists bigger molten steel turbulent fluctuation can be unfavorable for also that the come-up of field trash and bubble is removed in the molten steel.
From continuous casting technology context analyzer and relevant patent documentation analysis both at home and abroad, most of quality problems all have direct relation with the use of submersed nozzle in the production process, traditional submersed nozzle flows in to crystallizer in the control of burst speed and has been difficult to reach requirement, and this point especially is embodied under the continuous casting operation of high pulling rate.Although the introducing of crystallizer electromagnetic brake technology has been played positive effect to the reduction of steel stream flowing velocity, owing to need acquire electromagnetic braking equipment, in cost of equipment and energy resource consumption, for manufacturing enterprise has increased certain burden.
Summary of the invention
The purpose of this utility model is to provide the submersed nozzle structure based on the multiple exit braking, mainly is on the basis of existing continuous casting submersed nozzle, a kind of mouth of a river of optimal design.It is more reasonable to make in the casting process that liquid metal distributes in crystallizer, thereby has reduced the heat load of crystallizer wall face, has effectively controlled the high temperature casting process, and what may occur during especially continuous pouring is crossed waters leakage phenomenon, has guaranteed the direct motion of producing.Simultaneously, in the crystallizer reasonably Flow Field Distribution also help in the liquid metal come-up of non-metallic inclusion and bubble and remove, prevented being involved in of metal bath surface coverture, even if under the high casting speed continuous casting condition, also need not adopt the mode of electromagnetic braking to control again, guarantee the quality of product molten steel is mobile.
This mouth of a river not only can substitute traditional mouth of a river and produce in the continuous casting of iron and steel process, can also be used to pour into a mould the metal that other need protect cast, for example: magnesium, aluminium etc.The use at this mouth of a river is flowed to molten steel in the crystallizer in the casting process, conduct heat, and the removal of field trash plays a positive role.Thereby saved energy consumption and reduced production cost significantly.
The utility model comprises: main shaft, passage; On the axle main channel is arranged, an inlet is arranged at the top of main channel, enters the mouth to link to each other with the container that liquid metal is housed, and at the close mouth of a river, bottom of main channel end, has the molten metal of 2～4 pairs of side perforates to export along the design of mouth of a river major axes orientation, as Fig. 1, Fig. 2, Fig. 3.Mouth of a river outlet is positioned on the side circumferencial direction of main channel, as Fig. 4.And the mouth of a river one-sided has 2 inclination angles side exit up or down.
Mouth of a river outlet is positioned at the both sides of main channel, and the circumferencial direction that outlet is arranged in the mouth of a river becomes 2 directions at 175～185 ° of intervals, 3 directions at 115～125 ° of intervals of one-tenth, 4 directions at 85～95 ° of intervals of one-tenth.
The side delivery port is arranged in the circumferencial direction of mouth of a river main shaft symmetrically.
The axle of outlet of top, the mouth of a river and lower part outlet is positioned at same plane (P), and becomes 30～90 angular relationships with mouth of a river main shaft (z).
The cross section of upper and lower part, mouth of a river outlet is rectangle, circle, ellipse or other shape.
The mouth of a river adopts refractory material to make.
Side exit upwards or downward inclination angle, size, and shape can be adjusted arbitrarily according to different situations, for example, can the adjusting of inclination angle according to production technology, shape can be square outlet, round exit, or have the outlet of certain chamfering;
The submersed nozzle bottom shape can be adjusted arbitrarily according to different situations, for example, can be plate bottom, conical lower portion, perhaps fluted body bottom;
This mouth of a river in use should be immersed in below the metal bath surface;
The scope at this mouth of a river; The continuous pouring of molten steel; Copper, aluminium, the continuous pouring of non-ferrous metal liquids such as magnesium; Other might continuous casting or the melt of the cast that needs protection; Be applicable to big production or laboratory experiment.
According to above design feature, in the use, the liquid metal stream thigh that injects from the outlet of top, the mouth of a river interacts with the stream thigh that injects from mouth of a river lower part outlet, and synthetic new stream thigh has reduced the side lateral velocity, reaches the braking purpose.Its advantage is:
(1) compare with adopting traditional mouth of a river, this invention mouth of a river can reduce the heat load of crystallizer wall;
(2) compare with adopting traditional mouth of a river, this invention mouth of a river can reduce the turbulent fluctuation in crystallizer beam district and can and flow a burst impact velocity;
(3) compare with adopting traditional mouth of a river, this invention mouth of a river can reduce covering slag and cover metal liquid fluctuation down, prevents being involved in of covering slag;
(4) adopt this mouth of a river can obtain the liquid metal of steady flow;
(5) adopt this mouth of a river can reduce the quantity of the central less field trash of density of strand;
(6) adopt this mouth of a river to reduce and be involved in the central bubble quantity and bubble of strand, impel bubble to remove from metal bath surface in time.
The advantage at the utility model mouth of a river (as Fig. 3) be on submersed nozzle, to be furnished with a pair of or many offsides face towards outlet, and outlet has upwards or to the perforate of lower angle, in the casting process, molten steel flows out the back from these perforates and interacts, thereby reach to the molten steel retarding braking purpose of crystallization control device flow field.
Description of drawings
Fig. 1 has the exit position schematic diagram of two pairs of outlets for immersing the mouth of a river.
Fig. 2 has the exit position schematic diagram of three pairs of outlets for immersing the mouth of a river.
Fig. 3 has the exit position schematic diagram of four pairs of outlets for immersing the mouth of a river
Fig. 4 is the outlet schematic diagram of one-sided two outlets
The specific embodiment
Fig. 1～4 are a kind of specific embodiment of the present utility model.
The utility model comprises: main shaft, passage; On the axle main channel is arranged, one inlet is arranged at the top of main channel, inlet links to each other with the container that liquid metal is housed, at the close mouth of a river, bottom of main channel end, the molten metal outlet of 2～4 pairs of side perforates is arranged along the design of mouth of a river major axes orientation, mouth of a river outlet is positioned on the side circumferencial direction of main channel, and the mouth of a river one-sided has 2 inclination angles side exit up or down.
(1) mouth of a river refractory material
This mouth of a river can adopt traditional high-temperature refractory to make, aluminium oxide for example, aluminium carbide etc.Guarantee refractory quality, prevent that the mouth of a river from rupturing under distortion and tensile stress effect.
(2) mouth of a river installation method
This mouth of a river is installed similar to the conventional mouth of a river, and the mouth of a river is installed in continuous casting tundish bottom after preheating, in the casting process, must guarantee that the outlet at the mouth of a river all is immersed in below the metal bath surface.After the cast of certain heat is finished at the mouth of a river, promptly reach service life after, can change according to process requirements.
(3) mouth of a river is to the molten steel braking procedure
The utility model mainly utilizes the interactional principle between near the molten steel stream of the submersed nozzle outlet thigh to brake.Mouth of a river side exit is positioned at mouth of a river end, and 2 pairs or many to exporting along the distribution of mouth of a river major axes orientation, there are certain angular relationship in outlet of top, the mouth of a river and lower part outlet.Under normal continuous casting condition of work, molten steel can flow out from top outlet and lower part outlet respectively, form top stream thigh and bottom stream thigh, after this two plumes thigh merges, make the impact velocity of stream thigh significantly reduce, reduced burst the impact of whole stream initial solidification base shell in the crystallizer, adopt traditional submersed nozzle, molten steel can reach from the crystallizer wall zone behind the injection crystallizer, forms shock point at the crystallizer sidewall.After adopting the mouth of a river of the present invention, stream thigh from the outlet outflow of submersed nozzle top, in crystallizer with certain moving towards leptoprosopy to lower angle, and the stream thigh that flows out from mouth of a river lower part outlet, with certain moving towards leptoprosopy to upper angle, two plume thighs on the way converge in crystallizer, interact and form new stream thigh, impel the stream thigh to be disperseed well, thereby when the stream thigh arrived traditional mouth of a river what is called " shock point " zone, intensity weakened greatly in the centre position of distance crystallizer sidewall direction.When adopting the traditional mouth of a river, because the existence of shock point, high-temperature molten steel mainly concentrates on this point, and most of hot-fluid all concentrates near the crystallizer leptoprosopy, only has the small part heat to be sent to wide of crystallizer.So, can cause molten steel inhomogeneous cooling in the crystallizer, form casting blank defect, even cause production accident such as bleed-out.On the other hand, the undue concentration of copper plate of crystallizer heat also causes the copper coin heat load excessive easily, reduces the service life of copper coin.Adopted submersed nozzle of the present invention, more molten steel hot-fluid can be transferred to wide medium position of crystallizer by the flow field, makes that the interior heat flux distribution of crystallizer is more even, thereby helps the quick formation of wide solidified shell.In addition, it is overheated that the use at this mouth of a river has also reduced crystallization general ability portion, prevented the issuable thermal strain of copper coin.
In addition, adopt this mouth of a river, the come-up of also favourable and the medium and small density field trash of molten steel and bubble is removed, adopt this invention mouth of a river after, the removal effect of little density field trash in crystallizer in the molten steel is obvious, helps guaranteeing slab quality.
Claims (5)
1. submersed nozzle structure based on multiple exit braking, comprise main channel and paired side exit, one inlet is arranged at the top of main channel, inlet links to each other with the container that liquid metal is housed, at the close mouth of a river, bottom of main channel end, along the mouth of a river major axes orientation design molten metal outlet of 2～4 pairs of side perforates is arranged, mouth of a river outlet is positioned on the side circumferencial direction of main channel, and the mouth of a river one-sided has 2 inclination angle side exits up or down.
2. structure according to claim 1, it is characterized in that, mouth of a river outlet is positioned at the both sides of main channel, and the circumferencial direction that outlet is arranged in the mouth of a river becomes 2 directions at 175～185 ° of intervals, 3 directions at 115～125 ° of intervals of one-tenth, 4 directions at 85～95 ° of intervals of one-tenth.
3. structure according to claim 1 is characterized in that, lower end, the mouth of a river by last outlet and by under the outlet axle be positioned at same plane (P), and become 30～an angle of 90 degrees to concern with mouth of a river main shaft (z).
4. structure according to claim 1 is characterized in that, the cross section of upper and lower part, mouth of a river outlet is rectangle, circle, ellipse.
5. structure according to claim 1 is characterized in that, the mouth of a river adopts refractory material to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205011512U CN201760570U (en) | 2010-08-23 | 2010-08-23 | Multi-outlet brake based immersion type water nozzle structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205011512U CN201760570U (en) | 2010-08-23 | 2010-08-23 | Multi-outlet brake based immersion type water nozzle structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201760570U true CN201760570U (en) | 2011-03-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205011512U Expired - Fee Related CN201760570U (en) | 2010-08-23 | 2010-08-23 | Multi-outlet brake based immersion type water nozzle structure |
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| Country | Link |
|---|---|
| CN (1) | CN201760570U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102274961A (en) * | 2011-08-31 | 2011-12-14 | 中冶南方工程技术有限公司 | Submersed nozzles for shaped blank continuous casting crystallizer |
| CN102554158A (en) * | 2012-01-17 | 2012-07-11 | 中冶南方工程技术有限公司 | Arrangement structure for immersive water gap for large and square billet continuous casting crystallizer |
-
2010
- 2010-08-23 CN CN2010205011512U patent/CN201760570U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102274961A (en) * | 2011-08-31 | 2011-12-14 | 中冶南方工程技术有限公司 | Submersed nozzles for shaped blank continuous casting crystallizer |
| CN102554158A (en) * | 2012-01-17 | 2012-07-11 | 中冶南方工程技术有限公司 | Arrangement structure for immersive water gap for large and square billet continuous casting crystallizer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110316 Termination date: 20140823 |
|
| EXPY | Termination of patent right or utility model |