CN105458203A - Method for measuring liquid level fluctuation of crystallizer and flow field symmetry - Google Patents
Method for measuring liquid level fluctuation of crystallizer and flow field symmetry Download PDFInfo
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- CN105458203A CN105458203A CN201510982869.5A CN201510982869A CN105458203A CN 105458203 A CN105458203 A CN 105458203A CN 201510982869 A CN201510982869 A CN 201510982869A CN 105458203 A CN105458203 A CN 105458203A
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- steel nail
- liquid level
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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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- Aviation & Aerospace Engineering (AREA)
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Abstract
The invention relates to a method for measuring liquid level fluctuation of a crystallizer and flow field symmetry. The method includes the specific steps that in the actual pouring process of a single row or multiple rows of steel nail plates manufactured according to the size of sections of the crystallizer and a water gap, the two sides of the water gap are simultaneously and vertically inserted into the liquid surface of the crystallizer and taken out simultaneously and vertically after a few seconds; the diameter of a metal block attached to each steel nail, the height difference of each metal block on the two sides of the corresponding steel nail and the distance from the highest point of each metal block and the tail end of the corresponding steel nail are measured respectively; the three-dimensional outline of the liquid surface of the crystallizer and the flow speed of molten steel from a narrow surface to the water gap in actual production can be obtained at the same time through the measured information; and the three-dimensional outline of the liquid surface of the crystallizer and the fluctuating value and average value of the flow speed in the pouring process are analyzed by inserting the nails on two sides of the water gap many times, and by comparing the flow symmetry of molten steel on two sides of the water gap with the water gap central line as the center, the liquid level fluctuation of the liquid surface of the crystallizer and flow field symmetry are determined.
Description
Technical field
The invention belongs to Ferrous Metallurgy field of steel-making, be specifically related to a kind of symmetric method of liquid level fluctuation of crystallizer and flow field in measurement actual production.
Background technology
Molten steel flow in continuous cast mold is a complicated Three dimensional Turbulent Flow, comprising many complicated phenomenons, if the motion of the turbulent flow in the mouth of a river and crystallizer, bubble and field trash, multiphase flow, electromagnetic force are on the transfer of the impact of molten steel flow, heat transfer, interfacial phenomenon, slag-metal reaction and solute element and segregation.Wherein, the liquid fluctuating that the turbulent flow of molten steel in crystallizer causes and both sides, mouth of a river asymmetry quantum dot are the major reasons causing slag, and this can cause casting blank defect rate to raise and then reconditioning rate raises, and greatly improves production cost.But in casting process; about 1500 DEG C are maintained in order to make covering slag fusing and production direct motion liquid level temperature; the symmetry of the nowed forming of molten steel in crystallizer, liquid fluctuating and both sides, mouth of a river molten steel stream has no way of learning with this understanding, indirectly can only be judged by casting blank defect rate.Although physical analogy or numerical simulation may be used for research continuous-casting conditions to the symmetric impact of liquid fluctuating and flow field, if do not have actual measured results as checking, its authenticity and reliability are worth discussion.
There is scholar to utilize in recent years and steel nail is inserted mold liquid level molten steel flow velocity in the technique study casting process of mold liquid level, but due to its adopt be single or several with plank be connected steel nails, therefore the molten steel flow velocity of plug pin position can only be obtained, whole liquid level profile cannot be obtained, also just cannot study liquid fluctuating, and only insert mold liquid level in side, the mouth of a river, also cannot study the symmetry of both sides, mouth of a river molten steel stream.Therefore, to symmetric research or a blank of the liquid level fluctuation of crystallizer in actual casting process and both sides, mouth of a river molten steel stream.
Summary of the invention
The object of the present invention is to provide a kind of mold liquid level three-D profile in actual production, leptoprosopy of can simultaneously obtaining to the method for the molten steel flow velocity at the mouth of a river, by repeatedly implementing to analyze the average three-D profile of mold liquid level and mean flow rate in casting process, thus reach the acquisition liquid level three-dimensional wave emotionally symmetric object of condition and flow field.
To achieve these goals, the technical solution used in the present invention is: a kind of measurement determines the symmetric method of liquid level fluctuation of crystallizer and flow field in production, comprises the steps:
(1) make single according to crystallizer and mouth of a river cross dimensions or arrange Steel nail plate more, ensureing that each Steel nail plate can vertically insert in the crystallizer that will study;
(2) on step (1) described Steel nail plate, position, the mouth of a river, leptoprosopy position and interior outer arc position is marked;
(3) in casting process, step (2) is simultaneously vertically inserted mold liquid level in both sides, the mouth of a river according to mark position through the Steel nail plate of described mark, vertically proposes after stopping the several seconds simultaneously, treat that it cools;
(4) step (2) and (3) is repeated;
(5) clear up the sticky covering slag of each steel nail, the metal derby of implementation step (3) after coagulation on steel nail is exposed;
(6) respectively measuring process (5) described metal derby diameter, metal derby at steel nail both sides difference in height and metal derby peak to the distance of steel nail end;
(7) calculate molten steel flow velocity size according to formula (a), its direction is metal derby peak sensing minimum point sticky on step (5) described steel nail;
In formula: Φ
lumpfor the described metal diameter of step (4), mm; h
lumpfor step (4) described metal height, mm; V
sfor molten steel flow velocity, m/s;
(8) step (6) and (7) is repeated;
(9) on all steel nails of each moment step (8) obtained, metal derby peak obtains each moment mold liquid level line drawing to the distance drafting of steel nail end, asks its mean value to obtain the average line drawing of mold liquid level;
(10) size and Orientation of each moment mold liquid level molten steel flow velocity step (8) obtained is drawn and is obtained each moment mold liquid level speed vector figure, asks its mean value to obtain mold liquid level mean speed vector figure;
(11) contrast the mold liquid level line drawing of described step (9) gained and the speed vector figure of described step (10) gained, determine mold liquid level fluctuation and centered by the center line of the mouth of a river symmetry in flow field;
Further, the space of the space of described mouth of a river outer wall and described Steel nail plate, described crystallizer copper cooling wall and described Steel nail plate is all less than 5mm, makes described Steel nail plate insert described crystallizer simultaneously;
Further, the Steel nail plate of described step (1) comprises steel nail and plank, and wherein said plank thickness is 90 ~ 100mm;
Further, described steel nail length is 150 ~ 180mm, and diameter is 8 ~ 10mm;
Further, described in step (3), steel nail is 2 ~ 3 seconds in the described mold liquid level time of staying;
Further, the casting process of described step (3) is implemented number of times and is at least 3 times, every minor tick 5 ~ 10 minutes;
Further, every 8 minutes repeating said steps (3) in described step (4), repeat 10 times altogether;
Further, repeating said steps (6) and (7) in described step (8), number of times is 10 times.
beneficial effect
In measurement actual production of the present invention, the symmetric method of liquid level fluctuation of crystallizer and flow field, not only can illustrate the quality of continuous-casting conditions intuitively, also can be used as the foundation utilizing physical and numerical modeling verification model accuracy.
According to below with reference to the accompanying drawings to detailed description of illustrative embodiments, further feature of the present invention and aspect will become clear.
Accompanying drawing explanation
Comprise in the description and form the accompanying drawing of a part for description and description together illustrates exemplary embodiment of the present invention, characteristic sum aspect, and for explaining principle of the present invention.
Fig. 1 is implementation process schematic diagram of the present invention, wherein 1 submersed nozzle, 2 and 3 Steel nail plates, 4 and 5 copper cooling walls, 6 molten steel;
In Fig. 2, (a) is by needing the diameter of the sticky metal derby of steel nail measured after the invention process, (b) by needing the difference in height of the sticky metal derby of steel nail measured after the invention process, the distance that (c) is the sticky metal derby peak of steel nail to steel nail end that need measurement after the invention process.
Detailed description of the invention
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.The symmetric method of liquid level fluctuation of crystallizer and flow field in production is determined in measurement, comprises the steps:
(1) make single according to crystallizer and mouth of a river cross dimensions or arrange Steel nail plate more, ensureing that each pegboard can vertically insert in the crystallizer that will study;
(2) on step (1) described Steel nail plate, position, the mouth of a river, leptoprosopy position and interior outer arc position is marked;
(3) in actual casting process, described for step (2) Steel nail plate through mark is vertically inserted mold liquid level in both sides, the mouth of a river according to mark position simultaneously, vertically proposes after the several seconds simultaneously, treat that it cools;
(4) step (2) and (3) is repeated;
(5) clear up the sticky covering slag of each steel nail, the metal derby of implementation step (3) after coagulation on steel nail is exposed;
(6) respectively measuring process (5) described metal derby diameter, metal derby at steel nail both sides difference in height and metal derby peak to the distance of steel nail end;
(7) calculate molten steel flow velocity size according to formula (a), its direction is metal derby peak sensing minimum point sticky on step (5) described steel nail;
In formula: Φ
lumpfor the described metal diameter of step (4), mm; h
lumpfor step (4) described metal height, mm; V
sfor molten steel flow velocity, m/s.
(8) step (6) and (7) is repeated;
(9) on all steel nails of each moment step (8) obtained, metal derby peak utilizes professional drawing Software on Drawing cloud atlas to the distance of steel nail end, to obtain in actual production not mold liquid level line drawing in the same time, ask its mean value to obtain the average line drawing of mold liquid level;
(10) size and Orientation of each moment mold liquid level molten steel flow velocity step (8) obtained utilizes professional drawing Software on Drawing speed vector figure, to obtain in actual production not mold liquid level speed vector figure in the same time, ask its mean value to obtain mold liquid level mean speed vector figure.
(11) each both sides, moment mouth of a river liquid level line drawing and speed vector figure in crystallizer in comparison production process, to reach in the actual casting process of research liquid level fluctuation of crystallizer and the symmetric object in flow field centered by the center line of the mouth of a river.
Steel nail plate comprises steel nail and plank, and wherein said plank thickness is 90 ~ 100mm;
Described steel nail length is 150 ~ 180mm, and diameter is 8 ~ 10mm;
embodiment
Be 200mm × 1500mm in crystallizer cross dimensions, mouth of a river external diameter be 80mm conticaster on carry out, comprise the steps:
(1) Steel nail plate is made:
Steel nail length is 150mm, diameter is 10mm, at thickness be 90mm plank on become 3 row × 11 row be uniformly distributed, the wherein long 710mm of plank, wide 190mm;
(2) on step (1) described Steel nail plate, position, the mouth of a river, leptoprosopy position and interior outer arc position is marked;
(3) in actual casting process, described for step (2) Steel nail plate through mark is vertically inserted mold liquid level in both sides, the mouth of a river according to mark position simultaneously, within 2 seconds, vertically propose afterwards simultaneously, treat that it cools;
(4) repeated step (3) every 8 minutes, repeat 10 times altogether;
(5) clear up the sticky covering slag of each steel nail, the metal of implementation step (3) after coagulation on steel nail is exposed;
(6) respectively measuring process (5) described metal diameter of phi, at steel nail both sides difference in height h and metal derby peak to the distance H of steel nail end; First time implements measurement result of the present 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 mouth of a river
Metal derby diameter of phi/mm on the right side of the table 1-2 mouth 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 mouth 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 mouth 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 |
On the left of the table 3-1 mouth of a river, metal derby peak is to steel nail end-to-end distance from H/mm
On the right side of the table 3-2 mouth of a river, metal derby peak is to steel nail end-to-end distance 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) calculate molten steel flow velocity size according to formula (a), first time implements result of calculation of the present invention as shown in table 4-1 and 4-2, and its direction is metal peak level sensing minimum point sticky on step (5) described steel nail;
In formula: Φ
lumpfor the described metal diameter of step (4), mm; h
lumpfor step (4) described metal height, mm; V
sfor molten steel flow velocity, m/s.
Molten steel flow velocity V on the left of the table 4-1 mouth of a river
s/ 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 mouth of a river
s/ 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) to amount to 10 times;
(9) on all steel nails of each moment step (8) obtained, metal derby peak utilizes professional drawing Software on Drawing cloud atlas to the distance of steel nail end, obtain 10 moment mold liquid level line drawings in actual production, ask its mean value to obtain the average line drawing of mold liquid level;
(10) size and Orientation of each moment mold liquid level flow velocity step (8) obtained utilizes professional drawing Software on Drawing speed vector figure, obtain 10 moment mold liquid level speed vector figures in actual production, ask its mean value to obtain mold liquid level mean speed vector figure.
(11) each both sides, moment mouth of a river liquid level line drawing and speed vector figure in crystallizer in comparison production process, to reach in the actual casting process of research liquid level fluctuation of crystallizer and the symmetric object in flow field centered by the center line of the mouth of a river.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (8)
1. the symmetric method of liquid level fluctuation of crystallizer and flow field in production is determined in measurement, comprises the steps:
(1) make single according to crystallizer and mouth of a river cross dimensions or arrange Steel nail plate more, ensureing that each Steel nail plate can vertically insert in the crystallizer that will study;
(2) on step (1) described Steel nail plate, position, the mouth of a river, leptoprosopy position and interior outer arc position is marked;
(3) in casting process, step (2) is simultaneously vertically inserted mold liquid level in both sides, the mouth of a river according to mark position through the Steel nail plate of described mark, vertically proposes after stopping the several seconds simultaneously, treat that it cools;
(4) step (2) and (3) is repeated;
(5) clear up the sticky covering slag of each steel nail, the metal derby of implementation step (3) after coagulation on steel nail is exposed;
(6) respectively measuring process (5) described metal derby diameter, metal derby at steel nail both sides difference in height and metal derby peak to the distance of steel nail end;
(7) calculate molten steel flow velocity size according to formula (a), its direction is metal derby peak sensing minimum point sticky on step (5) described steel nail;
In formula: Φ
lumpfor the described metal diameter of step (4), mm; h
lumpfor step (4) described metal height, mm; V
sfor molten steel flow velocity, m/s;
(8) step (6) and (7) is repeated;
(9) on all steel nails of each moment step (8) obtained, metal derby peak obtains each moment mold liquid level line drawing to the distance drafting of steel nail end, asks its mean value to obtain the average line drawing of mold liquid level;
(10) size and Orientation of each moment mold liquid level molten steel flow velocity step (8) obtained is drawn and is obtained each moment mold liquid level speed vector figure, asks its mean value to obtain mold liquid level mean speed vector figure;
(11) contrast the mold liquid level line drawing of described step (9) gained and the speed vector figure of described step (10) gained, determine mold liquid level fluctuation and centered by the center line of the mouth of a river symmetry in flow field.
2. method according to claim 1, is characterized in that: the space of the space of described mouth of a river outer wall and described Steel nail plate, described crystallizer copper cooling wall and described Steel nail plate is all less than 5mm, makes described Steel nail plate insert described crystallizer simultaneously.
3. method according to claim 1, is characterized in that: the Steel nail plate of described step (1) comprises steel nail and plank, and wherein said plank thickness is 90 ~ 100mm.
4. method according to claim 3, is characterized in that: described steel nail length is 150 ~ 180mm, and diameter is 8 ~ 10mm.
5. method according to claim 4, is characterized in that: described in step (3), steel nail is 2 ~ 3 seconds in the described mold liquid level time of staying.
6. method according to claim 1, is characterized in that: the casting process of described step (3) is implemented number of times and is at least 3 times, every minor tick 5 ~ 10 minutes.
7. method according to claim 1, is characterized in that: every 8 minutes repeating said steps (3) in described step (4), repeats 10 times altogether.
8. method according to claim 1, is characterized in that: repeating said steps (6) and (7) in described step (8), number of times is 10 times.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| CN110539492A (en) * | 2019-09-10 | 2019-12-06 | 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 |
| CN113172206A (en) * | 2021-04-09 | 2021-07-27 | 北京科技大学 | Method for measuring flow field of steel liquid in crystallizer based on current change |
| CN113172207A (en) * | 2021-04-09 | 2021-07-27 | 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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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
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| 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 |
| CN113172206A (en) * | 2021-04-09 | 2021-07-27 | 北京科技大学 | Method for measuring flow field of steel liquid in crystallizer based on current change |
| CN113172207A (en) * | 2021-04-09 | 2021-07-27 | 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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| CN105458203B (en) | 2017-06-20 |
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