CN101596581A - The mathematical modeling evaluation method of tundish flow control effect - Google Patents
The mathematical modeling evaluation method of tundish flow control effect Download PDFInfo
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- CN101596581A CN101596581A CNA2009100881395A CN200910088139A CN101596581A CN 101596581 A CN101596581 A CN 101596581A CN A2009100881395 A CNA2009100881395 A CN A2009100881395A CN 200910088139 A CN200910088139 A CN 200910088139A CN 101596581 A CN101596581 A CN 101596581A
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Abstract
A kind of mathematical modeling evaluation method of tundish flow control effect is to adopt the characteristic value of numerical technique simulation tracing tracer time of staying distribution RTD curve to judge tundish bag type and flow control device quality.Set up the evaluation criterion of RTD curve quality: RTD peak of curve place dimensionless concentration is greater than 1, and the nondimensional time of peak value correspondence is preferable greater than 0.75 tundish flow control effect.This technology is applicable to the judgement of tundish bag type and flow control device quality, can fast and effeciently pass judgment on the tundish metallurgy effect, and directive function is played in the optimization transformation of on-the-spot tundish bag type and flow control device.This technology is applicable to the interpretation of water mould too.
Description
Technical field
The invention belongs to the continuous casting technology field, the mathematical modeling evaluation method that particularly relates to a kind of tundish flow control effect, it is the method that quantizes to pass judgment on tundish bag type and flow control device quality according to the peak value of (RTD) curve that the tracer time of staying is distributed, the RTD curve that is specially adapted to use numerical technique to calculate is judged, and then instructing the optimal design of tundish bag type and flow control device, this technology is applicable to the interpretation of water mould too.
Background technology
Along with the development of continuous casting technology with to improving constantly that slab quality requires, the effect of tundish is very important, and it is except stablizing beam, realizing the more important thing is and playing the promotion inclusion floating, the effect of cleaning molten steel the sequence casting.Development along with computer hardware, hydrodynamics software for calculation, the research means that the mathematical simulation method is low as a kind of cost, speed is fast, effective more and more is applied in tundish bag type and the rational research of flow control device by domestic and international metallargist.By dropping into tracer at the tundish inlet, change in time at exit monitoring tracer concentration and to obtain the RTD curve, this curve can reflect the piston region in the tundish, the back-mixing district, ratio between dead band and the short-circuit flow, but so far, never have the quality that clear and definite technical indicator is estimated the RTD curve, also can't from the RTD curve, directly pass judgment on the flow control effect of tundish.
Summary of the invention
The object of the present invention is to provide a kind of mathematical modeling evaluation method of tundish flow control effect,, can judge the quality of tundish bag type and flow control device fast and effectively according to the RTD curve shape by setting the peak parameters standard of RTD curve.
The technical solution adopted for the present invention to solve the technical problems is: by the checking of various research parameters and result of the test, adopt the characteristic value of numerical technique simulation tracing tracer time of staying distribution (RTD) curve to judge tundish bag type and flow control device quality, set up the evaluation criterion of dimensionless tracer time of staying curve (RTD curve): RTD peak of curve place dimensionless concentration is greater than 1, and the nondimensional time of peak value correspondence is preferable greater than 0.75 tundish flow control effect.The step of RTD curve is as follows:
1, at first adopt the hydrodynamics software for calculation to set up tundish model, setting the tundish inlet is the mass flow border, exports to be pressure export, carries out the stable state Flow Field Calculation of tundish.
2, after the tundish Flow Field Calculation is stablized, the steady-state model in the fluid software for calculation is converted to unsteady Model, in zero moment, drops into 1 second tracer in the tundish porch, the flow of tracer equates with tundish inlet molten steel flow;
3, tracer dropped into after 1 second, stopped to drop into tracer, monitored tundish exit tracer concentration change curve in time simultaneously, and after tracer all flowed out, calculating stopped, and obtains tracer time of staying distribution RTD curve;
4, handle the RTD curve that obtains, carry out the conversion of dimensionless RTD curve;
5, estimate the dimensionless RTD curve that obtains and whether satisfy judgment criteria, promptly peak value place nondimensional time is greater than 0.75, and dimensionless concentration, changes tundish structure and carries out computational analysis again, until reaching RTD curve judgment criteria if do not satisfy greater than 1.
Effect of the present invention:, can fast and effeciently judge the quality of tundish bag type and flow control device according to the RTD curve that calculates.Utilize this evaluation method that the tundish of certain steel mill is carried out bag type and flow control device optimization, effect is remarkable, and large-scale field trash obviously reduces, and the field trash qualification rate has improved more than 5%, greatly reduces production cost.
This technology is applicable to the judgement of tundish bag type and flow control device quality, can fast and effeciently pass judgment on the tundish metallurgy effect, and directive function is played in the optimization transformation of on-the-spot tundish bag type and flow control device.This technology is applicable to the interpretation of water mould too.
Description of drawings
Below to use this judgment criteria, certain steel mill's tundish flow control device is optimized is example, the present invention is further described with embodiment in conjunction with the accompanying drawings.
Fig. 1 is two kinds of difform RTD curves.Wherein a is the RTD curve of certain steel mill's prototype tundish, and b is the RTD curve behind the optimization flow control device.
The specific embodiment
1, at first adopt the hydrodynamics software for calculation to set up tundish model, set the tundish inlet and be mass flow, flow is 49.725kg/s, exports to be pressure export, and the pressure size is 1atm, carries out the stable state Flow Field Calculation of tundish.
2, after the tundish Flow Field Calculation is stablized, the steady-state model in the fluid software for calculation is converted to unsteady Model, in zero moment, drops into 1 second tracer in the tundish porch, the flow of tracer is 49.725kg/s.
3, tracer dropped into after 1 second, stopped to drop into tracer, monitored tundish exit tracer concentration change curve in time simultaneously, and after tracer all flowed out, calculating stopped, and obtains tracer time of staying distribution RTD curve;
4, handle the RTD curve that obtains, carry out the conversion of dimensionless RTD curve;
5, estimate the dimensionless RTD curve that obtains and whether satisfy judgment criteria, promptly peak value place nondimensional time is greater than 0.75, and dimensionless concentration, changes tundish structure and carries out computational analysis again, until reaching RTD curve judgment criteria if do not satisfy greater than 1.
As shown in Figure 1, be the RTD curve before and after certain steel mill's tundish internal control stream installation optimization, according to judgment criteria of the present invention, the nondimensional time at curve a peak value place is 0.51, and dimensionless concentration is 0.82, and flow control effect is undesirable; The nondimensional time at curve b peak value place is 0.81 (greater than 0.75), and dimensionless concentration is 1.1 (greater than 1), and flow control effect obviously is better than curve a.After the flow control device of curve b was taked at the scene, the field trash total amount and the size of production scene had all obtained remarkable decline, reach the optimization purpose of tundish bag type and flow control device.
Claims (1)
1, a kind of mathematical modeling evaluation method of tundish flow control effect, it is characterized in that: adopt the characteristic value of numerical technique simulation tracing tracer time of staying distribution RTD curve to judge tundish bag type and flow control device quality, set up the evaluation criterion of dimensionless tracer time of staying distribution RTD curve: RTD peak of curve place dimensionless concentration is greater than 1, and the nondimensional time of peak value correspondence is preferable greater than 0.75 tundish flow control effect; The calculation procedure of RTD curve is as follows:
(1) at first adopt the hydrodynamics software for calculation to set up tundish model, setting the tundish inlet is the mass flow border, exports to be pressure export, carries out the stable state Flow Field Calculation of tundish;
(2) the tundish Flow Field Calculation stable after, the steady-state model in the fluid software for calculation is converted to unsteady Model, zero constantly, drop in the tundish porch 1 second tracer, the flow of tracer and the tundish molten steel flow that enters the mouth equates;
(3) tracer dropped into after 1 second, stopped to drop into tracer, monitored tundish exit tracer concentration change curve in time simultaneously, and after tracer all flowed out, calculating stopped, and obtains tracer time of staying distribution RTD curve;
(4) handle the RTD curve that obtains, carry out the conversion of dimensionless RTD curve;
(5) estimate the dimensionless RTD curve that obtains and whether satisfy judgment criteria, peak value place nondimensional time is greater than 0.75, and dimensionless concentration, changes tundish structure and carries out computational analysis again, until reaching RTD curve judgment criteria if do not satisfy greater than 1.
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| CNA2009100881395A CN101596581A (en) | 2009-07-03 | 2009-07-03 | The mathematical modeling evaluation method of tundish flow control effect |
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| CNA2009100881395A CN101596581A (en) | 2009-07-03 | 2009-07-03 | The mathematical modeling evaluation method of tundish flow control effect |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107398538A (en) * | 2016-05-20 | 2017-11-28 | 上海梅山钢铁股份有限公司 | Become the decision method that steel grade cast continuous casting billet mixes steel region |
| CN111767627A (en) * | 2019-03-28 | 2020-10-13 | 青岛海尔智能技术研发有限公司 | Air duct evaluation system and evaluation method |
| CN111767628A (en) * | 2019-03-28 | 2020-10-13 | 青岛海尔智能技术研发有限公司 | Air duct evaluation system and evaluation method |
| CN111950107A (en) * | 2019-04-30 | 2020-11-17 | 上海梅山钢铁股份有限公司 | Analysis method for flow characteristics of flow field in multi-flow continuous casting tundish |
| CN117250158A (en) * | 2023-09-28 | 2023-12-19 | 北京科技大学 | Tundish evaluation method and system based on ink dyeing experiment area change |
-
2009
- 2009-07-03 CN CNA2009100881395A patent/CN101596581A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107398538A (en) * | 2016-05-20 | 2017-11-28 | 上海梅山钢铁股份有限公司 | Become the decision method that steel grade cast continuous casting billet mixes steel region |
| CN111767627A (en) * | 2019-03-28 | 2020-10-13 | 青岛海尔智能技术研发有限公司 | Air duct evaluation system and evaluation method |
| CN111767628A (en) * | 2019-03-28 | 2020-10-13 | 青岛海尔智能技术研发有限公司 | Air duct evaluation system and evaluation method |
| CN111950107A (en) * | 2019-04-30 | 2020-11-17 | 上海梅山钢铁股份有限公司 | Analysis method for flow characteristics of flow field in multi-flow continuous casting tundish |
| CN117250158A (en) * | 2023-09-28 | 2023-12-19 | 北京科技大学 | Tundish evaluation method and system based on ink dyeing experiment area change |
| CN117250158B (en) * | 2023-09-28 | 2024-04-12 | 北京科技大学 | Tundish evaluation method and system based on ink dyeing experiment area change |
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Open date: 20091209 |