CN208969980U - A kind of crystallizer model for the research of crystallizer flow field - Google Patents
A kind of crystallizer model for the research of crystallizer flow field Download PDFInfo
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Abstract
The utility model relates to a kind of crystallizer models for the research of crystallizer flow field, belong to continuous casting steel machine technical field.The crystallizer model for the research of crystallizer flow field of the utility model, including crystallizer ontology, the top of crystallizer ontology is equipped with submersed nozzle, which is connected with water inlet pipe, the bottom of crystallizer ontology is equipped with water outlet, and crystallizer is set inside the body flow distributor.The utility model avoids influence of the vortex generated at mold exit to crystallizer flow field by adding a flow distributor in crystallizer model, so that the flow field in crystallizer is more accurate.Then finite element software packet ANSYS is used, the MOLTEN STEEL FLOW model in crystallizer is established, simulates the flow field of the Mold under various process conditions, comparison is carried out to Fluid Dynamics experimental result；Fluid Dynamics experimental result and numerical result are finally utilized, in conjunction with live reality, process operation parameter is optimized.
Description
Technical field
It is main to apply the present invention relates to a kind of crystallizer model for the research of crystallizer flow field for considering vortex behavior
In the research such as continuous casting steel machine technical field crystallizer flow field and process operation parameter optimization, it is suitable for square billet, slab, round billet and connects
Casting and other all types of continuous castings, especially ultra-thin continuous beam blank casting field.
Background technique
Continuous casting process is the process of the liquid metal solidification forming comprising complicated phenomenons such as flowing, mass transfer, heat transfers, especially
For the crystallizer section of conticaster, flowing, mass transfer, diabatic process reciprocation influence each other, very tired using full-scale investigation
Difficulty, it is almost infeasible.If the flow field control in crystallizer is improper, will lead to crystallizer surface fluctuation it is larger, cause to protect
Shield slag is involved in, covering slag thawing is insufficient, to cannot play the role of lubrication, leads to bonding steel leakage and inclusion floating not
The problems such as clean, and then product quality is influenced, particularly with ultra-thin shaped blank, it is easy to appear corner cracks and other issues.Cause
This, studies and optimization design Mold flow process is extremely important.
The research method of Mold flow behavior has actual production experiment, mathematical simulation and physical analogy.But it is real
Border productive experiment is not easy to observe and cost dearly；And mathematical simulation use it is many it is assumed that and its accuracy mainly depend on
In mathematical model and boundary condition.Physical analogy is based on the principle of similitude, the flowing of the main flow simulating molten steel with water, due to it
Has many advantages, such as convenient, intuitive, reliable favor by numerous researchers.At present both at home and abroad to crystallizer flow field
Research mainly uses physical simulating method, i.e., by establishing crystallizer model, then by advanced test method and test
Instrument studies the flow field under different technology conditions, but to the optimization of model itself not yet by too big concern, researcher
Phenomena such as being primarily upon liquid fluctuating in crystallizer, impact depth, slag and different process operation parameters are to crystallizer
The influence of these interior phenomenons.
Such as, Chinese Patent Application No. 201310182341.0, the applying date are as follows: on May 16th, 2013, innovation and creation name
Referred to as: the flow field of continuous casting crystallizer physical simulating method of vibration behavior is considered, during physical simulating device used in this application includes
Between packet, submersed nozzle, crystallizer and circulating pump, submersed nozzle be inserted into crystallizer in；Crystallizer short transverse by up to
Under gradually taper up, the lower end of crystallizer connect by being flexible coupling with crystallizer extension, and crystallizer extension height, which is greater than, to be crystallized
Device height；Be flexible coupling can in mold oscillation dilatation therewith；It is equipped with circulating water outlet in crystallizer extension bottom, is followed
Ring water out totally three, to reduce influence of the outlet to crystallizer flow field；Circulating water outlet, circulating pump, tundish and immersion
The mouth of a river is sequentially connected, to form recirculated water between tundish, submersed nozzle, crystallizer, circulating water outlet and circulating pump
Road；Crystallizer passes through gripping apparatus grips and is in vacant state, and crystallizer extension is placed horizontally on stable bracket, institute
It states clamping device to place on a vibration table, mold oscillation can be driven by shake table.This application is due to considering crystallizer vibration
Influence of the behavior to its flow field is moved, the physical description of flow regime and liquid fluctuating state is more true in crystallizer.
However the model of crystallizer Fluid Dynamics experiment is also easy to produce whirlpool at mold exit when simulating crystallizer flow field at present
Flow phenomenon, the flow field that experimentation middle outlet vortex generates may be superimposed with the flow field of crystallizer itself, so as to cause water mould
It applies in actual production ineffective in the flow field optimized in draft experiment.
Summary of the invention
1. technical problems to be solved by the inivention
It is an object of the invention to overcome to be difficult to be truly reflected in actual production using existing continuous cast mold model to tie
The deficiency of brilliant device flow field provides a kind of crystallizer model for the research of crystallizer flow field.Using crystallization of the invention
Device model is more accurate to the research of crystallizer flow field and tallies with the actual situation, to be conducive to instruct to crystallize in actual production
The optimization of device flow field and process operation parameter.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention are as follows:
For the above deficiency of the existing technology, the present invention is by building crystallizer using similar three theorem as theoretical basis
Simultaneously flow distributor progress Fluid Dynamics experiment is added in vertical physical model in model, and then observes, detection crystallizer flow field, comments
The excellent mode in valence flow field are as follows: 1, pass through wave-height gauge detect liquid level fluctuation of crystallizer situation；2, by high-speed camera to experiment
Process carries out video recording to detect the impact depth in crystallizer, so that it is determined that most suitable impact depth；3, by using plant
Object oil simulation covering slag is to detect the slag situation of crystallizer flow field.If the above index does not reach optimum state,
It can include the works such as side opening size, side opening inclination angle and bottom outlet size by adjusting pulling rate, mouth of a river insertion depth and gate structure parameter
Skill operating parameter reaches optimum state.Then large scale business finite element software packet ANSYS is used, the steel in crystallizer is established
Water flow movable model simulates the flow field of the Mold under various process conditions, carries out comparison to water mould result；Most
Fluid Dynamics experimental result and numerical result are utilized afterwards, and in conjunction with live reality, process operation parameter is optimized.
Specifically, a kind of crystallizer model for the research of crystallizer flow field of the invention, including crystallizer ontology, knot
The top of brilliant device ontology is equipped with submersed nozzle, which is connected with water inlet pipe, and the bottom of crystallizer ontology is equipped with
The mouth of a river, and crystallizer is set inside the body flow distributor.
Further, the shape and size of the flow distributor and the inner cavity of crystallizer ontology match.
Further, the flow distributor is installed at crystallizer body bottom portion 180-200mm.
Further, the flow distributor with a thickness of 18-22mm, be machined with equally distributed aperture thereon, and
The gross area S of all apertures on flow distributor are as follows: Qs*(Vm/Vs)*(Am/As)/Vm；
Wherein VmFor model flow velocity, AmFor model sectional area, VsFor steel billet pulling rate, AsFor steel billet sectional area, QsFor situ flow
Amount, according to formula Qs=ladle molten steel weight/steel ladle pouring period is calculated.
Further, the water inlet pipe is equipped with the first valve and flowmeter.
Further, funnel is equipped on the water inlet pipe at submersed nozzle, which is used for crystallizer sheet
Addition tracer in vivo.
Further, the water outlet of the crystallizer body bottom portion is connected with outlet pipe, which is equipped with second
Valve.
Further, it is equipped with conductivity meter, DJ800 detection system and wave-height gauge in the crystallizer ontology, and crystallizes
Device outer body is equipped with video camera and polarisation source.
3. beneficial effect
Using technical solution provided by the invention, compared with prior art, there is following remarkable result:
(1) a kind of crystallizer model for the research of crystallizer flow field of the invention, including crystallizer ontology, the present invention
Influence of the exit vortex phenomenon to crystallizer flow field is considered, is set inside the body flow distributor in crystallizer, thus
It is possible to prevente effectively from crystallizer exit eddy generation phenomenon, therefore it is more quasi- to the research of crystallizer flow field using the model
Really and tally with the actual situation, the better effect that the flow field optimized in Fluid Dynamics experiment is applied in actual production.
(2) a kind of crystallizer model for the research of crystallizer flow field of the invention, passes through the peace to flow distributor
Holding position and thickness are optimized especially by the perforated area on flow distributor, so as to further protect
The degree of closeness in crystallizer flow field in institute's simulated flow pattern and actual production is demonstrate,proved, and then guarantees the effect of optimization in crystallizer flow field.
(3) a kind of crystallizer model for the research of crystallizer flow field of the invention, crystallizer ontology is interior to be equipped with conductance
Rate instrument, DJ800 detection system and wave-height gauge, and crystallizer outer body is equipped with video camera and polarisation source, is detected by wave-height gauge
Liquid level fluctuation of crystallizer situation records a video to experimentation by high-speed camera so as to detect the impact in crystallizer
Depth, and then be conducive to determine most suitable impact depth, can be directly as by the data analysis result to analog result
Instruct the foundation of the actual process operating parameter such as optimizations such as pulling rate, mouth of a river insertion depth and gate structure parameter.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of crystallizer model for the research of crystallizer flow field；
Fig. 2 is a kind of flow diagram of crystallizer flow field simulation method of the invention；
Fig. 3 is the calculation flow chart of crystallizer Field Flow Numerical Simulation of the invention；
Fig. 4 is the structural schematic diagram of the profile crystallizer model for the research of crystallizer flow field of embodiment 4；
Fig. 5 is the structural schematic diagram of flow distributor in embodiment 4.
In figure: 1, water inlet pipe；101, the first valve；102, flowmeter；2, funnel；3, submersed nozzle；4, crystallizer sheet
Body；5, flow distributor；6, outlet pipe；601, the second valve；7, polarisation source.
Specific embodiment
To further appreciate that the contents of the present invention, now in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment 1
As shown in Figure 1, a kind of crystallizer model for the research of crystallizer flow field of the present embodiment, including crystallizer sheet
The top of body 4, crystallizer ontology 4 is equipped with submersed nozzle 3, which is connected with water inlet pipe 1, crystallizer ontology 4
Bottom is equipped with water outlet, and the inside of crystallizer ontology 4 is equipped with flow distributor 5.Physical analogy is current crystallizer flow field
The main means of research, wherein the foundation of crystallizer model is for the effect of optimization of analog result and crystallizer flow field to Guan Chong
It wants.Applicant has found in the course of the research, and when being simulated using existing crystallizer model, it is existing that vortex is also easy to produce at mold exit
As the flow field for being vortexed generation will do it with the flow field of crystallizer itself to be superimposed, and does not consider above-mentioned vortex in the prior art
Influence of the phenomenon to crystallizer flow field, so as to cause the analog result to crystallizer flow field, there are biggish deviation, Fluid Dynamics
The effect that the flow field optimized in experiment is applied in actual production is relatively poor.
In view of the above problems, applicant has comprehensively considered the influence of crystallizer exit vortex phenomenon, to crystallizer model
Structure optimize, joined flow distributor in model, so as to effectively avoid crystallizer exit occur
Vortex phenomenon more accurately and tallies with the actual situation to the research of crystallizer flow field using the model of the present embodiment, Fluid Dynamics
The better effect that the flow field optimized in experiment is applied in actual production.
Embodiment 2
A kind of crystallizer model for the research of crystallizer flow field of the present embodiment, structure substantially with embodiment 1,
Difference essentially consists in: the shape and size of the flow distributor 5 and the inner cavity of crystallizer ontology 4 match.The present embodiment
Flow distributor 5 is installed at 4 bottom 180-200mm of crystallizer ontology, with a thickness of 18-22mm, flow distributor 5
On be machined with equally distributed aperture, and on flow distributor 5 all apertures gross area S are as follows: Qs*(Vm/Vs)*(Am/As) /
Vm；
Wherein VmFor model flow velocity, AmFor model sectional area, VsFor steel billet pulling rate, AsFor steel billet sectional area, QsFor situ flow
Amount, according to formula Qs=ladle molten steel weight/steel ladle pouring period is calculated.Applicant is by many experiments, to flow point
The installation site and thickness of orchestration, optimize especially by the perforated area on flow distributor, so as to
It is further ensured that the degree of closeness in crystallizer flow field in institute's simulated flow pattern and actual production, and then guarantees the optimization in crystallizer flow field
Effect.
Embodiment 3
A kind of crystallizer model for the research of crystallizer flow field of the present embodiment, structure substantially with embodiment 2,
Difference essentially consists in: the water inlet pipe 1 is equipped with the first valve 101 and flowmeter 102, and close to immersion water on water inlet pipe 1
Funnel 2 is equipped at mouth 3, the funnel 2 is for adding tracer into crystallizer ontology 4.4 bottom of crystallizer ontology goes out
The mouth of a river is connected with outlet pipe 6, the outlet pipe 6 be equipped with the second valve 601, and crystallizer ontology 4 in be equipped with conductivity meter,
DJ800 detection system and wave-height gauge are equipped with video camera and polarisation source 7 on the outside of crystallizer ontology 4.
The Fluid Dynamics experiment in crystallizer flow field is with similar three theorem for basic principle, and liquid flows in model and full mold
Similar primary condition is geometric similarity and dynamic similarity, and flow distributor is added in a model to make in crystallizer model
Flow field it is truer.For geometric similarity, any ratio can be used, for dynamic similarity, it is desirable that the stream in model and full mold
The Reynolds (Reynold's) criterion Re of body and the quasi- number Fr difference of pair Shandong moral are equal.But meet Reynolds (Reynold's) criterion and Fu Lude in model and full mold simultaneously
Quasi- number is equal extremely difficult, it is contemplated that under this experimental condition, fluid flow state has been in second from mould in model and full mold
Change area.Therefore, the flow regime of the system and velocity flow profile are unrelated with Reynolds (Reynold's) criterion Re, as long as guaranteeing related with gravity pair of Shandong
The quasi- quasi- number of number Fr of moral is equal to can reach dynamic similarity.The suitable likelihood ratio is determined according to laboratory condition, then according to reality
Model parameter establishes Fluid Dynamics experimental model, using a series of detection means, observes, the flow field under detection different technology conditions,
To optimize crystallizer flow field.
Crystallizer flow field is simulated using the crystallizer model of the present embodiment, including following procedure: opening the first valve
Door 101 enters water in crystallizer ontology 4 from submersed nozzle 3；When the height of water reaches the mould liquid level of simulation setting
When, the second valve 601 is opened, guarantees that liquid level keeps stablizing in crystallizer, to carry out Fluid Dynamics experiment, and then observes, detection
Crystallizer flow field.In Fluid Dynamics experimentation, fluctuation data information is acquired by wave-height gauge in crystallizer surface, utilizes polarisation
Source 7 is taken pictures and video camera video recording detects the impact depth in crystallizer, is detected in crystallizer and is flowed using vegetable oil simulation covering slag
The slag situation of field, ultimate analysis experimental data adjust pulling rate, mouth of a river insertion depth and gate structure according to data analysis result
Parameter makes These parameters reach optimum state, to optimize crystallizer flow field.
In conjunction with Fig. 2, crystallizer flow field is simulated using the crystallizer model of the present embodiment first, then passes through numerical value
The MOLTEN STEEL FLOW model established in ultra-thin Beam Blank Mould is calculated, is simulated in the beam blank mould under various process conditions
The flow field (as shown in Figure 3) of molten steel finally utilizes Fluid Dynamics experimental result and numerical result, in conjunction with live reality, makes to tie
Brilliant device liquid level liquid fluctuating≤± 5mm under the premise of not slag, to obtain the process operation parameter under the optimization aim.
Embodiment 4
A kind of crystallizer model for the research of crystallizer flow field of the present embodiment, structure substantially with embodiment 3,
Difference essentially consists in: the crystallizer model of the present embodiment is Beam Blank Mould model, structure (H profile steel knot as shown in Figure 4
Structure), the structure of flow distributor is as shown in Figure 5 in crystallizer ontology.It can effectively be protected using the crystallizer model of the present embodiment
The authenticity of Beam Blank Mould flow field simulation and its reliability of flow fieldoptimization result are demonstrate,proved, and then helps preferably to instruct different
The optimization of the continuous casting crystallining process of shape base, prevents the generation of its corner crack and other issues.
Claims (8)
1. a kind of crystallizer model for the research of crystallizer flow field, including crystallizer ontology (4), it is characterised in that: crystallization
The top of device ontology (4) is equipped with submersed nozzle (3), which is connected with water inlet pipe (1), crystallizer ontology (4)
Bottom be equipped with water outlet, and the inside of crystallizer ontology (4) be equipped with flow distributor (5).
2. a kind of crystallizer model for the research of crystallizer flow field according to claim 1, it is characterised in that: described
The shape and size of flow distributor (5) and the inner cavity of crystallizer ontology (4) match.
3. a kind of crystallizer model for the research of crystallizer flow field according to claim 1, it is characterised in that: described
Flow distributor (5) be installed at crystallizer ontology (4) bottom 180-200mm.
4. a kind of crystallizer model for the research of crystallizer flow field according to claim 1, it is characterised in that: described
Flow distributor (5) with a thickness of 18-22mm, be machined with equally distributed aperture thereon, and all on flow distributor (5) open
The gross area S in hole are as follows: Qs*(Vm/Vs)*(Am/As)/Vm；
Wherein VmFor model flow velocity, AmFor model sectional area, VsFor steel billet pulling rate, AsFor steel billet sectional area, QsFor live flow, root
According to formula Qs=ladle molten steel weight/steel ladle pouring period is calculated.
5. a kind of crystallizer model for the research of crystallizer flow field described in any one of -4 according to claim 1, special
Sign is: the water inlet pipe (1) is equipped with the first valve (101) and flowmeter (102).
6. a kind of crystallizer model for the research of crystallizer flow field according to claim 5, it is characterised in that: described
Funnel (2) are equipped at submersed nozzle (3) on water inlet pipe (1), which is used for the addition into crystallizer ontology (4)
Tracer.
7. a kind of crystallizer model for the research of crystallizer flow field described in any one of -4 according to claim 1, special
Sign is: the water outlet of crystallizer ontology (4) bottom is connected with outlet pipe (6), which is equipped with the second valve
(601)。
8. a kind of crystallizer model for the research of crystallizer flow field described in any one of -4 according to claim 1, special
Sign is: conductivity meter, DJ800 detection system and wave-height gauge, and crystallizer ontology (4) are equipped in the crystallizer ontology (4)
Outside is equipped with video camera and polarisation source (7).
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| CN108346366A (en) * | 2018-04-19 | 2018-07-31 | 安徽工业大学 | A kind of crystallizer model and crystallizer flow field simulation method for the research of crystallizer flow field |
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| CN108346366A (en) * | 2018-04-19 | 2018-07-31 | 安徽工业大学 | A kind of crystallizer model and crystallizer flow field simulation method for the research of crystallizer flow field |
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