CN105458203B - A kind of method for measuring liquid level fluctuation of crystallizer and flow field symmetry - Google Patents
A kind of method for measuring liquid level fluctuation of crystallizer and flow field symmetry Download PDFInfo
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- CN105458203B CN105458203B CN201510982869.5A CN201510982869A CN105458203B CN 105458203 B CN105458203 B CN 105458203B CN 201510982869 A CN201510982869 A CN 201510982869A CN 105458203 B CN105458203 B CN 105458203B
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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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/001—Full-field flow measurement, e.g. determining flow velocity and direction in a whole region at the same time, flow visualisation
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Abstract
The present invention relates to a kind of method for measuring liquid level fluctuation of crystallizer and flow field symmetry in actual production, concretely comprise the following steps：By the single or multiple rows of Steel nail plate made according to crystallizer and mouth of a river cross dimensions, mouth of a river both sides are inserted perpendicularly into mold liquid level simultaneously in actual casting process, it is simultaneously vertical after several seconds to propose, the viscous metal derby diameter of each steel nail institute is measured respectively, distance of the metal derby in steel nail both sides difference in height and metal derby peak to steel nail end, mold liquid level three-D profile in actual production can be simultaneously obtained by these metrical informations, leptoprosopy to the mouth of a river molten steel flow velocity, by repeatedly in mouth of a river both sides while plug pin is come mold liquid level three-D profile in analyzing casting process, the undulating value and average value of flow velocity, and the symmetry of mouth of a river both sides molten steel flow of the contrast centered on the center line of the mouth of a river, so as to reach the symmetry of the fluctuation and flow field that determine mold liquid level.
Description
Technical field
The invention belongs to Ferrous Metallurgy field of steel-making, and in particular to one kind measurement actual production in liquid level fluctuation of crystallizer and
The method of flow field symmetry.
Background technology
Molten steel flow in continuous cast mold is a Three dimensional Turbulent Flow for complexity, including many complicated phenomenons,
Influence, heat transfer such as the turbulent flow, the motion of bubble and field trash, multiphase flow, electromagnetic force in the mouth of a river and crystallizer to molten steel flow,
The transfer and segregation of interfacial phenomenon, slag-metal reaction and solute element.Wherein, the liquid level that turbulent flow of the molten steel in crystallizer causes
Fluctuation and mouth of a river both sides asymmetry quantum dot are the major reasons for causing slag, and this can cause casting blank defect rate to raise and then reconditioning rate
Raise, greatly improve production cost.But in casting process, in order that covering slag fusing and production direct motion liquid level temperature dimension
Hold at 1500 DEG C or so, with this understanding nowed forming of the molten steel in crystallizer, liquid fluctuating and mouth of a river both sides molten steel stream
Symmetry have no way of learning, can only indirectly be judged by casting blank defect rate.Although physical analogy or numerical simulation can be used
In research influence of the continuous-casting conditions to liquid fluctuating and flow field symmetry, but if without actual measured results as checking,
Its authenticity and reliability value must be discussed.
There is scholar to utilize mold liquid level steel in the technique study casting process of steel nail insertion mold liquid level in recent years
Flow velocity, but because it uses single or several steel nails for being connected with plank, therefore can only obtain at plug pin position
Molten steel flow velocity, it is impossible to obtain whole liquid level profile, also liquid fluctuating cannot just be studied, and only in mouth of a river side, insertion is tied
Brilliant device liquid level, cannot also study the symmetry of mouth of a river both sides molten steel stream.Therefore, to the crystallizer in actual casting process
The research of the symmetry of liquid fluctuating and mouth of a river both sides molten steel stream or a blank.
The content of the invention
Mold liquid level three-D profile, leptoprosopy be extremely in can simultaneously obtaining actual production it is an object of the invention to provide one kind
The method of the molten steel flow velocity at the mouth of a river, analyzes in casting process the average three-D profile of mold liquid level and average by repeatedly implementing
Flow velocity, the purpose of liquid level three-dimensional wave emotionally condition and flow field symmetry is obtained so as to reach.
To achieve these goals, the technical solution adopted by the present invention is：One kind measurement determines mold liquid level in production
Fluctuation and the method for flow field symmetry, comprise the following steps：
(1) single or multiple rows of Steel nail plate is made according to crystallizer and mouth of a river cross dimensions, it is ensured that each Steel nail plate can hang down
Straight cutting enters in the crystallizer to be studied；
(2) mouth of a river position, leptoprosopy position and interior outer arc position are marked on step (1) described Steel nail plate；
(3) it is in casting process, step (2) is same according to mark position in mouth of a river both sides by the Steel nail plate of the mark
When be inserted perpendicularly into mold liquid level, stop it is simultaneously vertical after the several seconds propose, treat that its is cooled down；
(4) repeat step (2) and (3)；
(5) the viscous covering slag of each steel nail institute is cleared up, the metal derby being set on steel nail after implementation steps (3) is exposed；
(6) difference measuring process (5) described metal derby diameter, metal derby are in steel nail both sides difference in height and metal derby highest
Put to the distance of steel nail end；
(7) molten steel flow velocity size is calculated according to formula (a), its direction is for viscous metal derby is most on step (5) described steel nail
High point points to minimum point；
In formula：ΦlumpIt is step (4) the metal diameter, mm；hlumpIt is step (4) metal height, mm；VsIt is steel
Flow velocity, m/s；
(8) repeat step (6) and (7)；
(9) metal derby peak to the distance of steel nail end is drawn on each moment all steel nails for obtaining step (8)
Each moment mold liquid level line drawing is obtained, asks it to be averagely worth to the average line drawing of mold liquid level；
(10) size and Orientation of each the moment mold liquid level molten steel flow velocity for obtaining step (8) is drawn and obtains each
Moment mold liquid level speed vector figure, asks it to be averagely worth to mold liquid level mean speed vector figure；
(11) the mold liquid level line drawing obtained by the step (9) and the speed obtained by the step (10) are contrasted
Polar plot come determine mold liquid level fluctuation and centered on the center line of the mouth of a river flow field symmetry；
Further, the space of the mouth of a river outer wall and the Steel nail plate, the crystallizer copper cooling wall and the steel nail
The space of plate is respectively less than 5mm, while making the Steel nail plate insert the crystallizer；
Further, the Steel nail plate of the step (1) include steel nail and plank, wherein the plank thickness be 90~
100mm；
Further, the steel nail length is 150~180mm, a diameter of 8~10mm；
Further, the steel nail described in step (3) is 2~3 seconds in the mold liquid level residence time；
Further, the casting process implementation number of times of the step (3) is at least 3 times, every minor tick 5~10 minutes；
Further, it is repeated 10 times altogether every 8 minutes repeating said steps (3) in the step (4)；
Further, repeating said steps (6) and (7) in the step (8), number of times are 10 times.
Beneficial effect
The method of liquid level fluctuation of crystallizer and flow field symmetry in measurement actual production of the invention, not only can be intuitively
The quality of continuous-casting conditions is illustrated, is alternatively arranged as being verified using physical and numerical modeling the foundation of model accuracy.
According to below with reference to the accompanying drawings to detailed description of illustrative embodiments, further feature of the invention and aspect will become
It is clear.
Brief description of the drawings
Comprising in the description and the part that constitutes specification accompanying drawing together illustrated with specification it is of the invention
Exemplary embodiment, feature and aspect, and for explaining principle of the invention.
Fig. 1 is implementation process schematic diagram of the invention, wherein 1 submersed nozzle, 2 and 3 Steel nail plates, 4 and 5 copper cooling walls, 6
Molten steel；
(a) needs the diameter of the viscous metal derby of steel nail of measurement, (b) to implement for the present invention in Fig. 2 after implementing by the present invention
Need afterwards measurement steel nail institute viscous metal derby difference in height, (c) be the present invention implement after need measure the viscous metal derby of steel nail
Peak to steel nail end distance.
Specific embodiment
Below in conjunction with the accompanying drawings, the preferred embodiments of the present invention are described in detail.Measurement determines crystallizer in production
The method of liquid fluctuating and flow field symmetry, comprises the following steps：
(1) single or multiple rows of Steel nail plate is made according to crystallizer and mouth of a river cross dimensions, it is ensured that each pegboard can hang down
Straight cutting enters in the crystallizer to be studied；
(2) mouth of a river position, leptoprosopy position and interior outer arc position are marked on step (1) described Steel nail plate；
(3) in actual casting process, by step (2) Steel nail plate by mark in mouth of a river both sides according to marker bit
Put while being inserted perpendicularly into mold liquid level, vertical proposition simultaneously, treats that its is cooled down after the several seconds；
(4) repeat step (2) and (3)；
(5) the viscous covering slag of each steel nail institute is cleared up, the metal derby being set on steel nail after implementation steps (3) is exposed；
(6) difference measuring process (5) described metal derby diameter, metal derby are in steel nail both sides difference in height and metal derby highest
Put to the distance of steel nail end；
(7) molten steel flow velocity size is calculated according to formula (a), its direction is for viscous metal derby is most on step (5) described steel nail
High point points to minimum point；
In formula：ΦlumpIt is step (4) the metal diameter, mm；hlumpIt is step (4) metal height, mm；VsIt is steel
Flow velocity, m/s.
(8) repeat step (6) and (7)；
(9) metal derby peak to the distance of steel nail end is utilized on each moment all steel nails for obtaining step (8)
Professional drawing Software on Drawing cloud atlas, obtains in actual production not mold liquid level line drawing in the same time, asks its average value to obtain
To the average line drawing of mold liquid level；
(10) size and Orientation of each the moment mold liquid level molten steel flow velocity for obtaining step (8) utilizes professional drawing
Software on Drawing speed vector figure, obtains in actual production not mold liquid level speed vector figure in the same time, asks it to be averagely worth to
Mold liquid level mean speed vector figure.
(11) each moment mouth of a river both sides liquid level line drawing and speed vector figure in crystallizer during comparison production,
Reach liquid level fluctuation of crystallizer in the actual casting process of research and centered on the center line of the mouth of a river flow field symmetry purpose.
Steel nail plate includes steel nail and plank, wherein the plank thickness is 90~100mm；
The steel nail length is 150~180mm, a diameter of 8~10mm；
Embodiment
It is 200mm × 1500mm in crystallizer cross dimensions, mouth of a river external diameter is to be carried out on the conticaster of 80mm, including as follows
Step：
(1) Steel nail plate is made：
Steel nail length is 150mm, a diameter of 10mm, in thickness to be uniformly distributed into 3 row × 11 row on the plank of 90mm, its
Middle plank 710mm long, width 190mm；
(2) mouth of a river position, leptoprosopy position and interior outer arc position are marked on step (1) described Steel nail plate；
(3) in actual casting process, by step (2) Steel nail plate by mark in mouth of a river both sides according to marker bit
Put while being inserted perpendicularly into mold liquid level, vertical proposition simultaneously, treats that its is cooled down after 2 seconds；
(4) every 8 minutes repeat steps (3), it is repeated 10 times altogether；
(5) the viscous covering slag of each steel nail institute is cleared up, the metal being set on steel nail after implementation steps (3) is exposed；
(6) respectively measuring process (5) described metal diameter of phi, in steel nail both sides difference in height h and metal derby peak extremely
Steel nail end apart from H；First time implements measurement result of the invention as shown in table 1-1 to table 3-2.
Metal derby diameter of phi/mm on the left of the table 1-1 mouths of a river
Metal derby diameter of phi/mm on the right side of the table 1-2 mouths of a river
| Outer arc | 13.7 | 13.08 | 14 | 12.6 | 13.2 | 12.66 | 13.94 | 13.74 | 13.36 | 13.74 | 12.5 |
| Center | 13.8 | 12.96 | 13.8 | 13.04 | 13.74 | 13.1 | 13.44 | 13.66 | 13.86 | 13.34 | 12.7 |
| Inner arc | 13.6 | 12.94 | 13.64 | 12.96 | 13.34 | 14.94 | 13.24 | 13.2 | 13.64 | 14.74 | 13.3 |
Metal derby difference in height h/mm on the left of the table 2-1 mouths of a river
| Outer arc | 0.5 | 3.2 | 5.7 | 4.1 | 5.4 | 5.2 | 0.9 | 2.7 | 3.8 | 1.1 | 4.1 |
| Center | 2.9 | 4.4 | 6.1 | 2 | 1.7 | 2.1 | 2.1 | 8.2 | 4.3 | 3.8 | 3.8 |
| Inner arc | 2.8 | 2.6 | 3.7 | 3.4 | 5.3 | 1.3 | 3.3 | 1.3 | 2.1 | 3.9 | 3.5 |
Metal derby difference in height h/mm on the right side of the table 2-2 mouths of a river
| Outer arc | 16.8 | 9 | 9.5 | 12.9 | 7.9 | 9.6 | 7.7 | 7.6 | 5.1 | 8.9 | 5.1 |
| Center | 12.5 | 4.1 | 9.8 | 5.4 | 2.6 | 5.4 | 4.4 | 6.6 | 1 | 3 | 2.5 |
| Inner arc | 5.3 | 1.4 | 3 | 5.3 | 4.9 | 7.4 | 2.2 | 4.5 | 0.7 | 1.7 | 3.5 |
Table 3-1 mouths of a river left side metal derby peak is to steel nail end apart from H/mm
Table 3-2 mouths of a river right side metal derby peak is to steel nail end apart from H/mm
| Outer arc | 103.9 | 96 | 98.35 | 100.45 | 95.75 | 94.1 | 93.95 | 93.3 | 92.45 | 95.55 | 100.35 |
| Center | 99.75 | 102.85 | 96.4 | 92.8 | 93.2 | 92.6 | 92.7 | 94.2 | 95 | 97.3 | 100.75 |
| Inner arc | 102.15 | 99.6 | 95 | 94.15 | 89.35 | 89.2 | 93.6 | 96.25 | 96.45 | 94.35 | 99.55 |
(7) molten steel flow velocity size is calculated according to formula (a), result of calculation of the invention such as table 4-1 and 4-2 is implemented for the first time
It is shown, its direction on step (5) described steel nail viscous metal peak be horizontally directed to minimum point；
In formula：ΦlumpIt is step (4) the metal diameter, mm；hlumpIt is step (4) metal height, mm；VsIt is steel
Flow velocity, m/s.
Molten steel flow velocity V on the left of the table 4-1 mouths of a rivers/ms-1
| Outer arc | 0.07 | 0.19 | 0.27 | 0.23 | 0.27 | 0.26 | 0.10 | 0.18 | 0.22 | 0.11 | 0.23 |
| Center | 0.19 | 0.24 | 0.28 | 0.15 | 0.14 | 0.16 | 0.16 | 0.33 | 0.23 | 0.21 | 0.23 |
| Inner arc | 0.18 | 0.17 | 0.21 | 0.20 | 0.26 | 0.12 | 0.20 | 0.12 | 0.16 | 0.22 | 0.20 |
Molten steel flow velocity V on the right side of the table 4-2 mouths of a rivers/ms-1
| Outer arc | 0.50 | 0.36 | 0.36 | 0.46 | 0.33 | 0.38 | 0.32 | 0.32 | 0.26 | 0.35 | 0.27 |
| Center | 0.42 | 0.23 | 0.37 | 0.27 | 0.17 | 0.27 | 0.24 | 0.29 | 0.10 | 0.19 | 0.18 |
| Inner arc | 0.26 | 0.13 | 0.19 | 0.27 | 0.25 | 0.30 | 0.16 | 0.24 | 0.08 | 0.13 | 0.21 |
(8) repeat step (6) and (7) amount to 10 times；
(9) metal derby peak to the distance of steel nail end is utilized on each moment all steel nails for obtaining step (8)
Professional drawing Software on Drawing cloud atlas, obtains 10 moment mold liquid level line drawings in actual production, asks its average value to obtain
To the average line drawing of mold liquid level；
(10) size and Orientation of each the moment mold liquid level flow velocity for obtaining step (8) utilizes professional drawing software
Speed vector figure is drawn, 10 moment mold liquid level speed vector figures in actual production are obtained, asks it to be averagely worth to crystallization
Device liquid level mean speed vector figure.
(11) each moment mouth of a river both sides liquid level line drawing and speed vector figure in crystallizer during comparison production,
Reach liquid level fluctuation of crystallizer in the actual casting process of research and centered on the center line of the mouth of a river flow field symmetry purpose.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (8)
1. it is a kind of to measure the method for determining liquid level fluctuation of crystallizer and flow field symmetry in production, comprise the following steps：
(1) single or multiple rows of Steel nail plate is made according to crystallizer and mouth of a river cross dimensions, it is ensured that each Steel nail plate can be inserted vertically
Enter in the crystallizer to be studied；
(2) mouth of a river position, leptoprosopy position and interior outer arc position are marked on step (1) described Steel nail plate；
(3) in casting process, step (2) is hung down simultaneously in mouth of a river both sides by the Steel nail plate of the mark according to mark position
Straight cutting enters mold liquid level, stops vertical proposition simultaneously after the several seconds, treats that its is cooled down；
(4) repeat step (2) and (3)；
(5) the viscous covering slag of each steel nail institute is cleared up, the metal derby being set on steel nail after implementation steps (3) is exposed；
(6) respectively measuring process (5) described metal derby diameter, metal derby in steel nail both sides difference in height and metal derby peak extremely
The distance of steel nail end；
(7) molten steel flow velocity size is calculated according to formula (a), its direction is viscous metal derby peak on step (5) described steel nail
Point to minimum point；
In formula：ΦlumpIt is step (4) the metal derby diameter, mm；hlumpIt is step (4) the metal tile height, mm；VsIt is steel
Flow velocity, m/s；
(8) repeat step (6) and (7)；
(9) metal derby peak is drawn to the distance of steel nail end and is obtained on each moment all steel nails for obtaining step (8)
Each moment mold liquid level line drawing, asks it to be averagely worth to the average line drawing of mold liquid level；
(10) size and Orientation of each the moment mold liquid level molten steel flow velocity for obtaining step (8) is drawn and obtains each moment
Mold liquid level speed vector figure, asks it to be averagely worth to mold liquid level mean speed vector figure；
(11) the mold liquid level line drawing obtained by the step (9) and the velocity obtained by the step (10) are contrasted
Scheme determine mold liquid level fluctuation and centered on the center line of the mouth of a river flow field symmetry.
2. method according to claim 1, it is characterised in that：Space of the outer wall at the mouth of a river with the Steel nail plate, institute
The copper cooling wall of crystallizer and the space respectively less than 5mm of the Steel nail plate are stated, while making the Steel nail plate insert the crystallizer.
3. method according to claim 1, it is characterised in that：The Steel nail plate of the step (1) includes steel nail and plank, its
Described in plank thickness be 90~100mm.
4. method according to claim 3, it is characterised in that：The steel nail length be 150~180mm, a diameter of 8~
10mm。
5. method according to claim 4, it is characterised in that：Steel nail is in the mold liquid level described in step (3)
Residence time is 2~3 seconds.
6. method according to claim 1, it is characterised in that：The casting process of the step (3) implements number of times and is at least 3
It is secondary, every minor tick 5~10 minutes.
7. method according to claim 1, it is characterised in that：Every 8 minutes repeating said steps in the step (4)
(3), it is repeated 10 times altogether.
8. method according to claim 1, it is characterised in that：Repeating said steps (6) and (7) in the step (8),
Number of times is 10 times.
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| CN105855484A (en) * | 2016-05-20 | 2016-08-17 | 首钢总公司 | Device and method for measuring surface flow velocity of slab continuous casting crystallizer |
| CN110539492B (en) * | 2019-09-10 | 2021-09-14 | 无锡市交大增智增材制造技术研究院有限公司 | Automatic detection method for bad 3D printing sample |
| CN112024841A (en) * | 2020-09-24 | 2020-12-04 | 邯郸钢铁集团有限责任公司 | Method for realizing on-line prediction of crystallizer flow field flow state in actual production |
| CN113172206B (en) * | 2021-04-09 | 2022-07-29 | 北京科技大学 | Method for measuring flow field of steel liquid in crystallizer based on current change |
| CN113172207B (en) * | 2021-04-09 | 2022-07-29 | 北京科技大学 | Device for measuring surface flow field of molten steel in crystallizer based on current change |
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| CN1788883A (en) * | 2004-12-13 | 2006-06-21 | 宝钢集团上海梅山有限公司 | Detecting tool and method for crystallizer protective slag |
| CN201283416Y (en) * | 2008-10-22 | 2009-08-05 | 宝山钢铁股份有限公司 | Steel liquid flow state detection apparatus |
| CN101745612A (en) * | 2009-12-30 | 2010-06-23 | 重庆大学 | Continuous-casting crystallizer simulation method by taking shell thickness and flowing quality balance into consideration and device thereof |
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| KR101533342B1 (en) * | 2014-02-17 | 2015-07-06 | 메탈젠텍 주식회사 | Replacement nail inspecting profile of molten metal and Apparatus inspecting profile of molten metal |
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|---|---|---|---|---|
| CN1788883A (en) * | 2004-12-13 | 2006-06-21 | 宝钢集团上海梅山有限公司 | Detecting tool and method for crystallizer protective slag |
| CN201283416Y (en) * | 2008-10-22 | 2009-08-05 | 宝山钢铁股份有限公司 | Steel liquid flow state detection apparatus |
| CN101745612A (en) * | 2009-12-30 | 2010-06-23 | 重庆大学 | Continuous-casting crystallizer simulation method by taking shell thickness and flowing quality balance into consideration and device thereof |
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