CN110153402A - Improve method and three stream T-type tundish that three stream T-type tundish respectively flow consistency - Google Patents
Improve method and three stream T-type tundish that three stream T-type tundish respectively flow consistency Download PDFInfo
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- CN110153402A CN110153402A CN201910248808.4A CN201910248808A CN110153402A CN 110153402 A CN110153402 A CN 110153402A CN 201910248808 A CN201910248808 A CN 201910248808A CN 110153402 A CN110153402 A CN 110153402A
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- barricade
- flat
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- tundish
- pouring area
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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
- B22D41/02—Linings
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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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Abstract
The present invention discloses a kind of method for improving three stream T-type tundish and respectively flowing consistency, tundish includes the first barricade between impact zone and pouring area, wherein this method comprises: the second flat barricade is respectively set in the two sides of the intermediate flow submersed nozzle of pouring area, second flat barricade is parallel to the axial direction of T-type tail portion from the first barricade and passes through entire pouring area and extend, and each second flat barricade is with intermediate flow submersed nozzle center at a distance of 100~300mm；And the flat barricade of third is set between the edge stream submersed nozzle of pouring area two and the ipsilateral second flat barricade respectively, the flat barricade of third is parallel to the axial direction of T-type tail portion and passes through entire pouring area and extend, and each flat barricade of third is with the center of ipsilateral neighbouring edge stream submersed nozzle at a distance of 100~300mm.The present invention also provides the three stream T-type tundish manufactured according to this method.The present invention can significantly reduce the content difference and temperature difference of the non-metallic inclusion of three stream molten steel, and each stream consistency is greatly improved.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy more particularly to a kind of three stream T-type tundish that improve respectively to flow consistency
Method and one kind three stream T-type tundish made of this method.
Background technique
Continuous casting working procedure in steel-making is that the molten steel in ladle flows through tundish, then distributes to crystallizer and forms steel billet base
Shell is finally frozen into the process of solid-state steel billet finally by a series of cooling equipment.Generally according to design for continuous casting machine, a centre
One or more crystallizer that can arrange in pairs or groups is wrapped, several crystallizers of arranging in pairs or groups in this way are known as " a little streams ".For example, a tundish is arranged in pairs or groups three
Crystallizer is known as " three stream ".
Tundish is the transition container between ladle and crystallizer, it plays distribution molten steel, uniform molten steel temperature, removal
The effects of non-metallic inclusion.Tundish is generally divided into impact zone and pouring area from structure.Impact zone is in ladle
The region that molten steel is flowed into through long nozzle, the region molten steel flow velocity is big, and molten steel stream is rapid；Pouring area be molten steel from tundish through immersing
The formula mouth of a river (hereinafter referred " mouth of a river ") is flowed into the region where crystallizer, and the general flow velocity in the region is smaller, and molten steel levelling is slow.In
Between wrap and generally coverture can be added on molten steel surface in normal work, on the one hand coverture can play the work of heat-insulation and heat-preservation
With the non-metallic inclusion in another aspect molten steel is capped agent absorption after floating, to play the role of purifying molten steel.
Barrier wall structure is equipped in general tundish.On the one hand barrier wall structure is used for shock isolation area molten steel beam to pouring area
The disturbance of molten steel reduces pouring area molten steel tubulence energy；Secondly it is also often arranged in pouring area, and suitable barrier wall structure can change
Kind flow field of molten steel and temperature field promote inclusion floating removal in molten steel, improve each stream and flow consistency.
Three stream T-type tundish are a kind of tundish structures that is common, being chiefly used in square billet or round billet continuous casting machine.It generally in
Axial symmetry distribution, impact zone is located at the tail portion of " T-type ", and pouring area is located at the head of " T-type ", between the two general use " U-shaped " or
" V-type " barricade separates.Above-mentioned barricade is in symmetrical structure, and barricade two sides are equipped with deflector hole, and the molten steel of impact zone passes through deflector hole stream
Enter the two sides of pouring area.Positioned at the pouring area of T-type head zone, there are three the mouths of a river, that is, are located at the centre of the intermediate region of pouring area
Flowing water mouth and two edge flowing water mouths near the end Liang Ge of pouring area, the above three mouth of a river are in symmetrical, equidistantly distributed,
Molten steel separately flows into three crystallizers below tundish from these three mouths of a river.Tundish with the structure is due to centre
Flowing water mouth is closer with barricade, and the stroke for flowing into the molten steel of the stream is shorter, causes the flow field of the molten steel of edge stream and intermediate flow
It differs greatly, material is thus formed the consistency poors of three streams.This consistency mainly includes non-metallic inclusion content
The consistency of (i.e. molten steel cleanliness) and the consistency of temperature.
Although there is more journal article document report can be by setting up gear between edge flowing water mouth and the intermediate flow mouth of a river
Dam or change " U-shaped " or " V-type " barricade deflector hole size and inclination angle improve the consistency of edge stream and intermediate flow, but
This improvement is still extremely limited, cannot fundamentally solve the problems, such as the consistency difference of three streams.
In addition, " computational fluid dynamics (Computational Fluid Dynamics, CFD) " is hydromechanical one
A branch, abbreviation CFD are the emerging interdisciplinary science that modern age hydrodynamics, numerical mathematics and computer science combine.It is with electronics
Computer is tool, and using the mathematical method of various discretizations, all kinds of problems of Fluid Mechanics carry out numerical experiment, computer
Simulation and analysis and research, obtain the approximate solution of fluid governing equation using the quick computing capability of computer, to solve various realities
Border problem.CFD rise in the 1960s, after with the nineties computer fast development, CFD developed rapidly,
Gradually become the important means in product development together with experimental fluid mechanics.Fluent is popular quotient in the world at present
It is transmitted for simulating the Complex Flows being never compressible in the compressible range of height with fluid, heat with general CFD software packet
Related industry can be used with chemical reaction etc..
In view of the consistency poor that above-mentioned three stream T-type tundish three flows, therefore, this field needs a kind of three stream of raising
T-type tundish respectively flows the method for consistency and the improved three stream T-type tundish according to this method manufacture, can significantly reduce three
Flow the content difference of the non-metallic inclusion of molten steel and the difference of temperature.
Summary of the invention
For the above-mentioned technical problems in the prior art, three stream T-types are improved the purpose of the present invention is to provide a kind of
The method that tundish respectively flows consistency can significantly reduce the content difference of the non-metallic inclusion of three stream molten steel and the difference of temperature
It is different.The improved three stream T that T-type tundish respectively flows the method manufacture of consistency is flowed according to above-mentioned raising three the present invention also provides a kind of
Type tundish.
It emphasizes herein, it is unless otherwise indicated, the common meaning of various scientific and technical terminologies in terms used herein and this field, each
The meaning of technical term defined in kind technology dictionary, textbook etc. is consistent.
Term " tracer " refers to observation, research and behavior or property of the measurement something in assignment procedure and is added
A kind of marker.
Term " residence time destribution (Residence Time Distribution) ", referred to as RTD refers to fluid
When point passes through device, the distribution situation of residence time length.
" the piston flow area " of residence time destribution refers to the region based on piston flow, wherein piston flow be a kind of simplification and
Utopian nowed forming, it is assumed that flowing through the piston-like flow forward of medium micelle of runner, its only radial mixing does not have
It axially diffuses；" the complete mixing flow area " of residence time destribution refers to the region based on complete mixing flow, and wherein complete mixing flow is and piston
Corresponding another kind situation, its mixing in all directions are all uniformly perfect, even if without concentration gradient, including axis
To mixing；" dead zone " of residence time destribution refers to the very slow region of flowing, when the residence time is more than 2 times of average stop
Between.
After new build and contain due to ladle and be typically necessary baking before molten steel, term " roasting bag apparatus " refer to for
Toast the device of ladle.
Term " stopper " refers to the refractory material in ladle by the opening and closing of the lifting Bit andits control mouth of a river and molten steel flow
Stick.
Typically, in the design between packet internal structure when, usually first using computational fluid dynamics (CFD) simulation method
Mathematical simulation is carried out, when obtaining preferable tundish configuration scheme, then carries out field test, can reduce set to greatest extent in this way
Meter or improvement cost.
When carrying out mathematical simulation to tundish molten steel, stable flow field of molten steel is obtained first, then from molten steel inlet
Simulation tracer is added with transient state, then solves the Three dimensional Turbulent mass transfer equation of tracer transient state in tundish, can calculate
Distribution (RTD curve) situation of the tracer concentration of each outflux at any time out.Showing for each stream can be calculated according to RTD data
The POPULATION STANDARD difference Sn of track agent concentration.Sn is bigger, and each consistency that flows is poorer, otherwise better.The stream of molten steel in tundish
Dynamic state may be generally viewed as being made of piston flow area, complete mixing flow area and three, dead zone part, volume ratio shared by these three regions
Weight can be calculated according to RTD curve data, and the lower general dead space volume the better, and piston flow area is conducive to inclusion floating,
It is uniform that complete mixing flow area is conducive to molten steel temperature.
In order to achieve the above objectives, present inventive concept is that can be put down by being symmetrical arranged in the pouring area of three stream T-type tundish
Board-like barricade, to construct molten steel streambuf between adjacent submersed nozzle, molten steel is redistributed through buffer area, so that stream
Molten steel stream to each submersed nozzle is more balanced, to improve the consistency that three stream T-type tundish respectively flow.
Based on above-mentioned design, present invention design is as follows:
Firstly, modeling and grid dividing are carried out to the tundish that different flat barrier wall structures are arranged in pouring area, due to
Tundish is symmetrical structure, the 1/2 of its volume is taken to be used as zoning to reduce calculation amount.
In next step, mathematical simulation is carried out to above-mentioned various models using computational fluid dynamics (CFD) analogy method, such as
Three-dimensional steady state fluid calculation is carried out to above-mentioned various models with Fluent.The basic assumption of above-mentioned various models can include: (1) in
Between packet liquid level be considered as free slip boundary, ignore influence of the tundish covering slag to molten steel flow；(2) tundish fluid flows
For three-dimensional incompressible stable state turbulent flow, ignore influence of the Temperature Field in Tundish to molten steel flow；(3) heat transfer of tundish
Journey is a steady state heat transfer process；(4) transmission of tracer is a unstable mass transfer process；(5) density, viscosity of molten steel,
The physical parameters such as specific heat capacity are constant.
In next step, after obtaining stable flow field, test verification is carried out.Specifically, from the molten steel inlet of tundish
Tracer 1s is added with transient state, then solves the Three dimensional Turbulent mass transfer equation of tracer transient state in tundish, that is, calculates each
Distribution (RTD) curve of the tracer concentration of outflux at any time.Finally, according to RTD data, so that it may each stream be calculated
The POPULATION STANDARD difference Sn of tracer concentration and the volume ratio in tundish inner piston stream area, complete mixing flow area and dead zone.
Finally, by the POPULATION STANDARD difference Sn and tundish of the tracer concentration respectively flowed obtained according to the present invention
Inner piston stream area, complete mixing flow area and the volume ratio in dead zone and the relevant parameter of the prior art are compared.
By above-mentioned design, on the one hand, according to embodiments of the present invention, provide it is a kind of improve three stream T-type tundish respectively flow one
The method of cause property, wherein the tundish includes the impact zone positioned at T-type tail portion, the pouring area positioned at T connector portion and is located at
The first barricade between impact zone and pouring area, pouring area include positioned at pouring area intermediate region intermediate flow submersed nozzle and
Two edge stream submersed nozzles being located near the end Liang Ge of pouring area, wherein described method includes following steps:
The second flat barricade is respectively set in the two sides of the intermediate flow submersed nozzle in the basket pouring area,
In, the second flat barricade is parallel to the axial direction of T-type tail portion from the first barricade and passes through entire pouring area and extend, and each second is flat
Board-like barricade is with the center of intermediate flow submersed nozzle at a distance of 100~300mm；And
Respectively the basket pouring area two edge stream submersed nozzles and the ipsilateral second flat barricade it
Between be arranged the flat barricade of third, wherein the flat barricade of third is parallel to the axial direction of T-type tail portion and passes through entire pouring area and prolong
It stretches, each flat barricade of third is with the center of ipsilateral neighbouring edge stream submersed nozzle at a distance of 100~300mm.
Further, in a preferred embodiment, the second flat barricade and the flat barricade of third are comparable
High 0~the 100mm of normal work liquid level of the tundish, the lower part of the second flat barricade can be equipped with intermediate flow deflector hole,
The lower part of the flat barricade of third can be equipped with edge conductance discharge orifice.
In one embodiment, intermediate flow deflector hole and edge conductance discharge orifice, which can have from horizontal plane is acclivitous, inclines
Angle, the inclination angle are to tilt 20~60 degree upwards along fluid flow direction from horizontal plane.
In one embodiment, the second flat barricade positioned at intermediate flow submersed nozzle two sides can be set in its underpart respectively
One or more intermediate flow deflector holes are set, and the flat barricade of third for being located at two edge stream submersed nozzle adjacent places can divide
Two or more edge conductance discharge orifices are not set in its underpart, wherein all edge conductances of each flat barricade of third
The total cross-section area of discharge orifice can be the total cross-section area of all intermediate flow deflector holes of the flat barricade of ipsilateral second
2 times.
In one embodiment, can an intermediate flow deflector hole be arranged in its underpart respectively in each second flat barricade, and
Can two edge conductance discharge orifices be arranged in its underpart respectively in each flat barricade of third.
In one embodiment, intermediate flow deflector hole and edge conductance discharge orifice can be square hole.
In one embodiment, the pouring area of the tundish may be designed as, so that drying in the pouring area to the tundish
When roasting, baking point can cover five be separated by two the second flat barricades and two flat barricades of third of pouring area
Region.
Further, in another preferred embodiment of the present invention, the height of the second flat barricade and the flat barricade of third
Degree can be 0.4 times to 0.6 times of the normal work liquid level of the tundish.
In one embodiment, the second flat barricade and the flat barricade of third can be not provided with deflector hole.
On the other hand, according to embodiments of the present invention, a kind of improved three stream T-type according to the manufacture of aforementioned either method is provided
Tundish, with axisymmetric shape.The axis of above-mentioned axisymmetric shape can be the axis of T-type tail portion.
The raising three provided according to embodiments of the present invention flows T-type tundish and respectively flows the method for consistency and according to party's legal system
The improved three stream T-type tundish made can get it is following the utility model has the advantages that can be effectively improved three stream T-type tundish flow field of molten steel and
Temperature field；It is consistent that each stream is greatly improved in the content difference and temperature difference that the non-metallic inclusion of three stream molten steel can be significantly reduced
Property；And the inclusion floating removal ability of tundish can be enhanced, improve molten steel cleanliness.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes of the invention one
Point, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, does not constitute improper limitations of the present invention.Attached
In figure:
Fig. 1 schematically shows the top view of the improved three stream T-type tundish of embodiment manufacture according to the present invention；
Fig. 2 schematically shows the main view of the first U-shaped barricade in Fig. 1；
Fig. 3 schematically show the axisymmetric three stream T-type tundish of another embodiment manufacture according to the present invention two/
One perspective view；
The curve of Fig. 4 illustrates the RTD curve of the three stream T-type tundish of Fig. 3；
Fig. 5 schematically show the axisymmetric three stream T-type tundish of another embodiment manufacture according to the present invention two/
One perspective view；
The curve of Fig. 6 illustrates the RTD curve of the three stream T-type tundish of Fig. 5；
The curve of Fig. 7 illustrates the RTD curve of three stream T-type tundish in the prior art.
Drawing reference numeral explanation
1: long nozzle；2: the first barricades；21: the first deflector holes；3: intermediate flow submersed nozzle；4: edge stream immersion water
Mouthful；5: the second flat barricades；6: the flat barricade of third；7: stopper；8: intermediate flow deflector hole；9: edge conductance discharge orifice；10:
Tundish；11: impact zone；12: pouring area.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described in corresponding attached drawing.Obviously, described embodiment is only of the invention
A part of the embodiment, instead of all the embodiments.Based on the embodiment of the present invention, those of ordinary skill in the art are not doing
All other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
In embodiments of the present invention, it is to be understood that the (if present)s such as term " first ", " second " are only used for
Purpose is described, relative importance is not understood to indicate or imply or implicitly indicates the quantity of indicated technical characteristic.By
This, one or more of the features can be expressed or be implicitly included to the feature for defining the analogous terms such as " first ", " second ".
In embodiments of the present invention, it is to be understood that the (if present)s such as term " first ", " second " are only used for
Distinguish similar part or part, rather than the specific sequence of description or precedence.It should be understood that term " the in this way
One ", the (if present)s such as " second " are interchangeable under appropriate circumstances, so that the application embodiment described here can
To implement except shown here as other sequences in addition to sequence.
Below in conjunction with attached drawing, the technical solution provided according to embodiments of the present invention is described in detail.
Referring to Fig. 1 and 2, on the one hand, an embodiment according to the present invention, provide it is a kind of improve three stream T-type tundish respectively flow one
Cause property method, wherein the tundish 10 include positioned at T-type tail portion impact zone 11, positioned at T connector portion pouring area 12,
And the first barricade 2 between impact zone 11 and pouring area 12, pouring area 12 include being located in 12 intermediate region of pouring area
Between stream submersed nozzle 3 and two edge stream submersed nozzles 4 being located near the end of pouring area 12 two, wherein institute
The method of stating includes the following steps:
The second flat barricade 5 is respectively set in the two sides of the intermediate flow submersed nozzle 3 of pouring area 12, wherein second
Flat barricade 5 is parallel to the axial direction of T-type tail portion from the first barricade 2 and passes through entire pouring area 12 and extend, each second plate
Formula barricade 5 is with the center of intermediate flow submersed nozzle 3 at a distance of 100~300mm；And
It is arranged between the two edge stream submersed nozzles 4 and the ipsilateral second flat barricade 5 of pouring area 12 respectively
The flat barricade 6 of third, wherein the flat barricade 6 of third is parallel to the axial direction of T-type tail portion and passes through entire pouring area 12 and prolong
It stretches, each flat barricade 6 of third is with the center of ipsilateral neighbouring edge stream submersed nozzle 4 at a distance of 100~300mm.
In Fig. 1 and 2 illustrated embodiment, the first barricade 2 is U-shaped.In other examples, the first barricade 2 can also for V-type or
Other suitable shapes.
In addition, the stopper 7 in Fig. 1 can be inserted in edge stream submersed nozzle 4, to control edge stream submersed nozzle 4
Opening and closing and molten steel flow.
Further, in a preferred embodiment, the second flat barricade 5 and the flat barricade 6 of third
0~100mm higher than the normal work liquid level of tundish 10, the lower part of the second flat barricade 5 can be equipped with intermediate flow deflector hole
8, the lower part of the flat barricade 6 of third can be equipped with edge conductance discharge orifice 9, as shown in Figure 3.
In one embodiment, intermediate flow deflector hole 8 and edge conductance discharge orifice 9, which can have from horizontal plane is acclivitous, inclines
Angle, the inclination angle can be to tilt 20~60 degree upwards along fluid flow direction from horizontal plane.As shown in figure 3, intermediate conductance
Discharge orifice 8 can be towards the direction of intermediate flow submersed nozzle 3 from level 20~60 degree of inclination upwardly, and edge conductance discharge orifice 9 can be towards side
The direction that submersed nozzle 4 is flowed in portion tilts upwardly 20~60 degree from level.The positive pitch and edge stream of intermediate flow deflector hole 8
The positive pitch of deflector hole 9 can be identical, can also be different, can according to circumstances and suitably select.
In one embodiment, the second flat barricade 5 positioned at 3 two sides of intermediate flow submersed nozzle can be respectively in its underpart
One or more intermediate flow deflector holes 8 are set, and are located at the flat barricade of third of two 4 adjacent places of edge stream submersed nozzle
6 can be arranged two or more edge conductance discharge orifices 9 in its underpart respectively, wherein all sides of each flat barricade 6 of third
The total cross-section area of portion's conductance discharge orifice 9 can be total cross of all intermediate flow deflector holes 8 of the flat barricade 5 of ipsilateral second
2 times of area of section.
In one embodiment, can an intermediate flow deflector hole 8 be arranged in its underpart respectively in each second flat barricade 5,
And can two edge conductance discharge orifices 9 be arranged in its underpart respectively in each flat barricade 6 of third.
In one embodiment, intermediate flow deflector hole 8 and edge conductance discharge orifice 9 can be square hole.In other examples, in
Between conductance discharge orifice 8 and edge conductance discharge orifice 9 can also be round hole, rectangular opening, diamond hole or slotted eye etc..
Referring to Fig. 1 to 3, the molten steel in ladle can flow into the impact zone 11 of tundish 10 through long nozzle 1, then via the
The first deflector hole 21 at one barricade, 2 two sides flow to respectively the second flat barricade 5 and the flat barricade 6 of ipsilateral third it
Between region, then via the intermediate flow deflector hole 8 of the second flat barricade 5 and the edge conductance discharge orifice of the flat barricade 6 of third
9, intermediate flow submersed nozzle 3 and edge stream submersed nozzle 4 are separately flowed into, the region where crystallizer is finally flowed out to.
In fact, the present invention is made by providing the second flat barricade 5 and the flat barricade 6 of third in pouring area two sides
The region obtained between the second flat barricade 5 and the flat barricade 6 of ipsilateral third forms one " molten steel buffer area ", to make
The molten steel flowed into from the first barricade 2 is redistributed, therefore present invention employs the designs of " Local Symmetric, molten steel are reallocated "
Thinking.For example, " can an intermediate flow deflector hole 8, and each the be arranged in its underpart respectively in each second flat barricade 5
Three flat barricades 6 can be arranged in two 9 " this embodiments of edge conductance discharge orifice in its underpart respectively, and molten steel is flat by third
Two edge conductance discharge orifices 9 on board-like barricade 6 flow into the edge stream submersed nozzle 4 of side, and the edge stream of the other side immerses
Also similarly, while molten steel is also by two the second flat barricades for being symmetrically positioned in 3 two sides of intermediate flow submersed nozzle at the formula mouth of a river 4
5 intermediate flow deflector hole 8 flows into intermediate flow submersed nozzle 3, so that it is guaranteed that flowing into the overall volume flow of three molten steel outlet
It is unanimous on the whole.Thus, the flow field difference of the molten steel of intermediate flow and edge stream reduces, and improves the consistency of three streams.
To be described by taking an embodiment as an example below, but a specific embodiment of the invention is not limited to convenient for explaining
Following embodiments.
Embodiment 1:
The normal work liquid level of three stream T-type tundish 10 can be 850mm.1 center of long nozzle and intermediate flow immersion
The distance at 3 center of the mouth of a river can be 1000mm, spacing between adjacent intermediate flow submersed nozzle 3 and edge stream submersed nozzle 4
It can be 1350mm.As shown in figures 1 and 3, the second flat barricade 5 can be set up in 3 two sides of intermediate flow submersed nozzle, in edge
The inside of stream submersed nozzle 4 can set up the flat barricade 6 of third；Each second flat barricade 5 can be immersed with intermediate flow
The center at the formula mouth of a river 3 is at a distance of 195mm, and the flat barricade 6 of each third can be with ipsilateral neighbouring edge stream submersed nozzle 4
Center at a distance of 195mm.
The structure of second flat barricade 5 and the flat barricade 6 of third may be designed as, so that the second flat 5 He of barricade
The height of the flat barricade 6 of third works normally the high 80mm of liquid level than tundish 10.As shown in figure 3, the flat gear of third
Wall 6 can be in the adjacent place of the side containment wall (i.e. the inclined side in the T connector portion of Fig. 1) close to T-type tail portion in T connector portion and separate
The adjacent place of the side containment wall (i.e. the horizontal side in the T connector portion of Fig. 1) of T-type tail portion, respectively opens up a deflector hole, i.e. edge stream
Deflector hole 9；Second flat barricade 5 can be in side containment wall (the i.e. water in the T connector portion of Fig. 1 of the separate T-type tail portion in T connector portion
Plane side) adjacent place, open up a deflector hole, i.e. intermediate flow deflector hole 8.Also, intermediate flow deflector hole 8 and edge conductance stream
The inclination angle in hole 9 can be 30 degree of inclination upwards from horizontal direction, the shape of intermediate flow deflector hole 8 and edge conductance discharge orifice 9
For the square hole of side length 100mm.Intermediate flow deflector hole 8 and edge conductance discharge orifice 9 can be equal with the neighbouring containment wall of tundish 10 and packet bottom
At a distance of 100mm.
In order to facilitate testing and examining, which has done mathematical simulation, analog result such as table 1 to the tundish 10 at scene
Shown in RTD curve graph with Fig. 4.Table 1 shows the calculating and analysis result of the RTD curve of different schemes.In order to compare, Fig. 7 is given
Have the RTD curve graph that the prototype three in technology flows T-type tundish.
It note that the mouth of a river 1# in Fig. 4 and 7 is corresponding with edge stream submersed nozzle 4, the mouth of a river 2# and intermediate flow immersion water
Mouth 3 is corresponding.RTD curve in Fig. 4 and 7 indicates the distribution of the tracer concentration of each outflux at any time.Therefore, the mouth of a river pair 1#
The RTD curve answered indicates the distribution of the tracer concentration of edge stream submersed nozzle 4 at any time, the corresponding RTD curve in the mouth of a river 2#
Indicate the distribution of the tracer concentration of intermediate flow submersed nozzle 3 at any time.
It can be observed from Fig. 7, for prototype three in the prior art flows T-type tundish, the corresponding RTD in the mouth of a river 1#
Curve RTD curve co-insides region corresponding with the mouth of a river 2# is less or registration is poor, this illustrates edge stream submersed nozzle 4 in
Between flow submersed nozzle 3 consistency it is poor.Moreover, in Fig. 7, the corresponding RTD curve in the mouth of a river 1# there are higher spike, this
Illustrate that the tracer concentration at edge stream submersed nozzle 4 at this time is very high, this further illustrate edge stream submersed nozzle 4 with
The consistency of intermediate flow submersed nozzle 3 is poor.
Contrastingly, can be observed from Fig. 4, for three stream T-type tundish 10 of the embodiment, the mouth of a river 1# is corresponding
RTD curve RTD curve co-insides region corresponding with the mouth of a river 2# it is more or registration is preferable, this illustrates edge stream submersed nozzle
4 are greatly improved with the consistency of intermediate flow submersed nozzle 3.Moreover, in Fig. 4, in the corresponding RTD curve in the mouth of a river 1#
Spike significantly become smaller, this further illustrates that the consistency of edge stream submersed nozzle 4 and intermediate flow submersed nozzle 3 improves
?.
Table 1:
In table 1, Vd indicates that dead space volume ratio, Vm indicate complete mixing flow volume ratio, and Vp indicates piston region volume ratio, and Sn is indicated
The POPULATION STANDARD of each stream tracer concentration is poor.
From the above results, the POPULATION STANDARD difference Sn of the embodiment is reduced than the prototype solution of the prior art
42.47%, dead space volume reduces 34.8%, this is absolutely proved, the flow field of the tundish 10 of embodiment 1 has obtained preferable excellent
Change, each stream consistency of tundish 10 is greatly improved.
In short, in RTD curve graph and table 1 in Fig. 4 as a result, all illustrating edge stream submersed nozzle 4 and intermediate flow
The consistency of submersed nozzle 3 is greatly improved.
In addition, in one embodiment, the pouring area 12 of tundish 10 may be designed as, so that in the pouring area to tundish 10
When 12 baking, baking point can cover being separated by two the second flat barricades 5 and the flat barricade 6 of two thirds for pouring area 12
At five regions.
Further, in another preferred embodiment of the present invention, the second flat barricade 5 and the flat barricade 6 of third
Height can be 0.4 times to 0.6 times of the normal work liquid level of tundish 10.
In one embodiment, the second flat barricade 5 and the flat barricade 6 of third can be not provided with deflector hole.
To be described by taking an embodiment as an example below, but a specific embodiment of the invention is not limited to convenient for explaining
Following embodiments.
Embodiment 2:
As shown in Figure 1 and Figure 5, the second flat barricade 5 is set up in the two sides of intermediate flow submersed nozzle 3, in edge stream
The flat barricade 6 of third is set up on the inside of submersed nozzle 4；Each second flat barricade 5 can be with intermediate flow submersed nozzle 3
Center at a distance of 195mm, and the flat barricade 6 of each third can be with the center of ipsilateral neighbouring edge stream submersed nozzle 4
At a distance of 195mm.
The structure of second flat barricade 5 and the flat barricade 6 of third may be designed as, so that the second flat barricade 5
Height can be 350mm, and the height of the flat barricade 6 of third can be 450mm.
The present embodiment mathematical modeling results are as shown in table 2 and Fig. 6.The RTD curve that table 2 shows different schemes calculates and divides
Analyse result.Similarly, the prototype in the prior art three that can be flowed three in Fig. 6 in the RTD curve and Fig. 7 of T-type tundish flows T-type
The RTD curve of tundish is compared.
Similarly, can be observed from Fig. 7, for prototype three in the prior art flows T-type tundish, the mouth of a river 1# is corresponding
RTD curve RTD curve co-insides region corresponding with the mouth of a river 2# it is less or registration is poor, the corresponding RTD curve in the mouth of a river 1# is deposited
In higher spike, illustrate that edge stream submersed nozzle 4 is poor with the consistency of intermediate flow submersed nozzle 3.
Contrastingly, can be observed from Fig. 6, for three stream T-type tundish 10 of the embodiment, the mouth of a river 1# is corresponding
RTD curve RTD curve co-insides region corresponding with the mouth of a river 2# it is more or registration is preferable, this illustrates edge stream submersed nozzle
4 are greatly improved with the consistency of intermediate flow submersed nozzle 3.Moreover, in Fig. 6, in the corresponding RTD curve in the mouth of a river 1#
Spike become smaller, this further illustrates that edge stream submersed nozzle 4 and the consistency of intermediate flow submersed nozzle 3 improve.
Table 2:
It note that Vd indicates that dead space volume ratio, Vm indicate complete mixing flow volume ratio, Vp indicates piston region volume ratio, and Sn is indicated
The POPULATION STANDARD of each stream tracer concentration is poor.
From the above results, Sn reduces 16.80% than former scheme, and dead space volume reduces 21.23%.This illustrates reality
10 flow field of tundish for applying example 2 also can preferably be optimized.
On site by embodiment application, by taking steel grade SUS304 as an example.Through analysis statistics discovery, in this embodiment, side
The amount of inclusions of the size greater than 20 microns of portion's stream and intermediate flow reduces 7.67% and 19.79% respectively；Size between two streams
Greater than 20 microns the amount of inclusions differences also reduce 45.04%.It was verified that the folder of improved three stream T-type tundish 10
The enhancing of sundries floating removal ability, each consistency that flows significantly improve.
On the other hand, according to embodiments of the present invention, a kind of improved three stream T according to the manufacture of aforementioned either method is also provided
Type tundish 10, with axisymmetric shape.The axis of above-mentioned axisymmetric shape can be the axis of T-type tail portion.
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or equipment for including a series of elements not only includes those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or equipment institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including institute
State in the process, method, article or equipment of element that there is also other identical elements.
Finally, it should be noted that the above examples are only used to illustrate the technical scheme of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of method for improving three stream T-type tundish and respectively flowing consistency, wherein the tundish includes being located at T-type tail portion
Impact zone, the first barricade positioned at the pouring area in T connector portion and between impact zone and pouring area, pouring area include being located at
The intermediate flow submersed nozzle of pouring area intermediate region and two edge streams being located near the end Liang Ge of pouring area immerse
The formula mouth of a river, which is characterized in that described method includes following steps:
The second flat barricade is respectively set in the two sides of the intermediate flow submersed nozzle in the basket pouring area, wherein the
Two flat barricades are parallel to the axial direction of T-type tail portion from the first barricade and pass through entire pouring area and extend, and each second is flat
Barricade is with the center of intermediate flow submersed nozzle at a distance of 100~300mm；And
It is set between two edge stream submersed nozzles and the ipsilateral second flat barricade in the basket pouring area respectively
Set the flat barricade of third, wherein the flat barricade of third is parallel to the axial direction of T-type tail portion and passes through entire pouring area and extend,
Each flat barricade of third is with the center of ipsilateral neighbouring edge stream submersed nozzle at a distance of 100~300mm.
2. the method as described in claim 1, which is characterized in that the second flat barricade and the flat barricade of third are than described
High 0~the 100mm of normal work liquid level of tundish, the lower part of the second flat barricade are equipped with intermediate flow deflector hole, and third is flat
The lower part of board-like barricade is equipped with edge conductance discharge orifice.
3. method according to claim 2, which is characterized in that intermediate flow deflector hole and edge conductance discharge orifice all have from level
Inclined inclination angle upwardly, the inclination angle are to tilt 20~60 degree upwards along fluid flow direction from horizontal plane.
4. method as claimed in claim 3, which is characterized in that the second flat gear positioned at intermediate flow submersed nozzle two sides
One or more intermediate flow deflector holes are arranged in its underpart respectively in wall, and are located at the of two edge stream submersed nozzle adjacent places
Two or more edge conductance discharge orifices are arranged in its underpart respectively in three flat barricades, wherein each flat barricade of third
All edge conductance discharge orifices total cross-section area be the second ipsilateral flat barricade all intermediate flow deflector holes it is total
2 times of cross-sectional area.
5. method as claimed in claim 4, which is characterized in that each second flat barricade is arranged one in its underpart respectively
Intermediate flow deflector hole, and two edge conductance discharge orifices are arranged in its underpart respectively in the flat barricade of each third.
6. method according to claim 2, which is characterized in that intermediate flow deflector hole and edge conductance discharge orifice are square hole.
7. the method as described in any one of claim 2 to 6, which is characterized in that the pouring area of the tundish is designed as, and is made
When the pouring area to the tundish is toasted, baking point covering pouring area by two the second flat barricades and two the
Five regions that three flat barricades are separated into.
8. the method as described in claim 1, which is characterized in that the height of the second flat barricade and the flat barricade of third is equal
It is 0.4 times to 0.6 times of the normal work liquid level of the tundish.
9. method according to claim 8, which is characterized in that the second flat barricade and the flat barricade of third are not provided with
Deflector hole.
10. three stream T-type tundish made of a kind of method according to any one of claim 1 to 9, with axial symmetry
Shape.
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| CN111331088A (en) * | 2020-04-20 | 2020-06-26 | 中冶京诚工程技术有限公司 | Crystallizer for arc-shaped hollow round billet continuous casting machine and arc-shaped hollow round billet continuous casting machine |
| CN111496233A (en) * | 2020-04-29 | 2020-08-07 | 唐山市国亮特殊耐火材料有限公司 | Three-flow slab continuous casting tundish shunting structure and manufacturing method |
| CN114682753A (en) * | 2022-03-25 | 2022-07-01 | 中冶南方连铸技术工程有限责任公司 | Control process for improving three-flow tundish flow field |
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Application publication date: 20190823 |