CN100561390C - Secondary cooling dynamic control system for continuous casting billet - Google Patents
Secondary cooling dynamic control system for continuous casting billet Download PDFInfo
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- CN100561390C CN100561390C CNB2007101589085A CN200710158908A CN100561390C CN 100561390 C CN100561390 C CN 100561390C CN B2007101589085 A CNB2007101589085 A CN B2007101589085A CN 200710158908 A CN200710158908 A CN 200710158908A CN 100561390 C CN100561390 C CN 100561390C
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- 238000001816 cooling Methods 0.000 title claims abstract description 34
- 238000009749 continuous casting Methods 0.000 title claims abstract description 20
- 238000005266 casting Methods 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000007711 solidification Methods 0.000 claims abstract description 16
- 230000008023 solidification Effects 0.000 claims abstract description 16
- 238000012546 transfer Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 238000009825 accumulation Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 20
- 239000010959 steel Substances 0.000 claims description 20
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 238000007726 management method Methods 0.000 claims description 9
- 238000013439 planning Methods 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 238000006467 substitution reaction Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 238000004886 process control Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 9
- 238000004364 calculation method Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000013316 zoning Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention provides a continuous casting billet secondary cooling dynamic control system which can adjust water flow in time along with process change, has stable casting billet solidification process and small surface temperature fluctuation and can obtain good casting billet quality. The system mainly comprises a mathematical module and an incremental PID control system, wherein the mathematical module substitutes field process parameters into an unstable solidification-heat transfer equation, the equation is established based on structural parameters of a casting machine, the equation is used for solving and calculating, the influence relationship of the change of the parameters on the surface temperature of a casting blank, the depth of a liquid cavity and the position of a solidification point terminal is determined, and the temperature field of the casting blank and the position of a solidification tail end are dynamically displayed. And the incremental PID control system is used for adjusting the water quantity according to the difference value between the calculated temperature field and the target temperature field, the temperature difference rate and the temperature difference accumulation degree. The invention is suitable for the process control of the continuous casting secondary cooling section.
Description
Technical field
The present invention relates to continuous casting process control technology field, be specifically related to continuous casting billet secondary cooling dynamic control system.
Background technology
In the continuous casting process, most of quality problems of strand are relevant with the cooling procedure of strand, and the main cooling procedure of strand is in secondary cooling zone, and the control technology of this section is the key link in the continuous casting process.The present conticaster secondary cooling control system of most iron and steel enterprises at home is ratio or the quadratic power proportioning pattern based on pulling rate, though this technology funtcional relationship is simple, be easy to realize control, but this technology mode does not deeply relate to the complicacy of casting blank solidification diabatic process, technological parameter determine to depend on experience, extendability is relative with transplantability relatively poor, and when process conditions change in implementation process, the casting blank surface temperature fluctuation is bigger, can not satisfy the requirement of modern steel enterprise to continuous casting billet quality control.
Summary of the invention
At the deficiencies in the prior art, the present invention proposes can be with the variation of technological parameter, in time adjust discharge, casting blank solidification process stabilization, surface temperature fluctuation are little, can obtain the continuous casting two cold kinetic-control system of good slab quality.
The present invention adopts following technical scheme to realize:
Continuous casting billet secondary cooling dynamic control system comprises being connected in the execute-in-place being a level system of content and being level two between the three-level system of content with the production planning management that described level two comprises:
Number reason module, it is by the calculating to steel grade, the degree of superheat, casting speed, secondary cooling velocity, casting blank cross-section size, secondary cooling zone temperature, ambient temperature etc., determine that the variation of these parameters is to casting blank surface temperature, the liquid core degree of depth and solidify the influence relation in final position dynamically shows the temperature field of secondary cooling section strand and the position of solidification end;
Incremental PID control system, it implements water yield adjusting according to the difference of accounting temperature field and target temperature field, the speed and the temperature accumulation degree of temperature variation;
Described number reason module, its input end are that three-level system, the boundary condition module of production planning management, the output terminal of expansion module link to each other with content respectively, and its output terminal links to each other with the input end of incremental PID control system; The output terminal of described incremental PID and execute-in-place are that a level system of content links to each other; Described its input end of boundary condition module is connected in a level system of execute-in-place; Its input end of described expansion module links to each other with the three-level system of production planning management.
Described number reason module, it can be with casting speed, water velocity, cast temperature, secondary cooling water temperature and the environment temperature etc. of transient state as the known conditions substitution based on the structural parameters of casting machine, nozzle placement, process conditions etc. and astable solidifying-heat transfer equation of setting up, find the solution calculating, make the instantaneous variation of some main result parameters, variation with process conditions in time feeds back as solidifying point position, fraction solid distribution and casting blank surface temperature, thereby dynamically shows the temperature field of secondary cooling section strand and the position of solidification end.
Described incremental PID control system, its base program are that after initialization, in each time step, calculating strand temperature field with the result of calculation and the target temperature difference input incremental pid control module at reference mark, is exported and respectively distinguished the water yield more earlier.When accounting temperature and target temperature difference greater than to a certain degree the time, do not drop into integral element, so that water yield governing speed is accelerated; When accounting temperature during near target temperature, drop into integral element, cause the casting blank surface temperature fluctuation to prevent overshoot.At last, recomputate boundary condition, prepare the calculating of next time step, carry out so repeatedly, can realize the control of strand temperature in real time, the fastest the reach average per 0.2 second water yield that once calculates of output just according to respectively distinguishing the water yield after changing.
Also comprise the boundary condition module in the described level two, it can make total reason module find the solution the reality of more fitting, and regulating pondage and distribution thereof exactly can solve the local quality problems of strand pointedly.
Described boundary condition module, border coefficient of heat transfer h in its model is a step-by-step design, adjust in conjunction with test determination by on-the-spot historical data, field datas such as the steel grade that obtains according to the network data substitute mode, the water yield, temperature, pulling rate, make total reason module find the solution the reality of fitting, accurately regulating pondage can solve the local quality problems of strand targetedly.
Also comprise expansion module in the described level two, it makes system be applicable to the casting machine of many structure types and the steel of many kinds.
Described expansion module, in the database of this module, the casting machine and the parameters such as roller row layout, nozzle placement thereof of multiple structure type are being deposited in tabulation; The parameter of many kinds steel is being deposited in tabulation, and behind the parameter input data file of a certain casting machine, a certain steel grade, module will be made corresponding selection according to data file.
Compared with prior art the invention has the advantages that:
1, can be according to the variation of continuous casting process, calculate in real time and export the surface, zoning and central temperature concerns over time.
2, the present invention can effectively control the temperature that is positioned at each cooling circuit reference mark by the water yield of each cooling circuit of control strand, and the stability in each temperature field, reference mark obviously improves.
3, on the result calculated of temperature field, in conjunction with solidus temperature, can predict the solidification end position easily, gently depress etc. the enforcement of technology for solidification end and created good condition.
4, can formulate technology targetedly flexibly according to the structure and the steel grades of casting machine.
Description of drawings
Accompanying drawing is a continuous casting billet secondary cooling dynamic control system structural representation block diagram.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
As shown in the figure, the present invention is connected between a level system and the three-level system, be called level two, a described level system is main contents with the execute-in-place, described three-level system is to be main contents with the production management plan, the present invention is that described level two mainly comprises: number reason module 1, incremental PID control system 2, boundary condition module 3 and expansion module 4, described number reason module 1, its input end respectively with three-level system, boundary condition module 3 links to each other with the output terminal of expansion module 4, its output terminal links to each other with the input end of incremental PID control system 2, the output terminal of described incremental PID control system 2 links to each other with a level system of execute-in-place, described boundary condition module 3 its input ends are connected in a level system of execute-in-place, and described expansion module 4 its input ends are connected with the three-level system of production planning management.
Described number reason module 1, its variation by the calculating of steel grade, the degree of superheat, casting speed, two cold temperature, casting blank cross-section size, two cold-zone temperature, ambient temperature etc. being determined these parameters is to casting blank surface temperature, the liquid core degree of depth and solidify the influence relation in final position, dynamically shows the temperature field of secondary cooling zone strand and the position of solidification end.
Described number reason module 1, its ultimate principle be with the casting speed of transient state, flow rate, cast temperature, secondary cooling water temperature etc. and ambient temperature etc. as the known conditions substitution based on the structural parameters of casting machine, nozzle placement, process conditions etc. and the unstable state of setting up solidify-heat transfer equation
That is:
T representation temperature wherein, V
CastRepresent pulling rate, k
EffRepresent coefficient of heat conductivity, S represents latent heat of solidification.
Utilize alternating direction implicit method for solving iterative, the variation of determining these parameters is to casting blank surface temperature, and the liquid core degree of depth and solidify the influence relation in final position dynamically shows the temperature field of secondary cooling section strand and the position of solidification end.
Described incremental PID control system 2 is implemented water yield adjusting according to temperature field and the difference of the target temperature field in the described on-the-spot technological data bank, the speed and the temperature accumulation degree of temperature variation that described number reason module is found the solution; This control system is found the solution according to following incremental proportional-integral-differential control algolithm:
Δ u wherein
Pd(n), Δ u
i(n) be respectively the variable quantity of the output water yield of calculating through proportion differential link, integral element, β is the integration separation value, and Δ u (n) is the variable quantity of the final output water yield.
Its ultimate principle is: after initialization, in each time step, calculate the strand temperature field earlier, again the result of calculation and the target temperature difference at reference mark are imported the incremental pid control module, the water yield is respectively distinguished in output, when accounting temperature and target temperature difference greater than to a certain degree the time, do not drop into integral element, so that water yield governing speed is accelerated; When accounting temperature during near desired value, drop into integral element, cause the casting blank surface temperature fluctuation to prevent overshoot, according to respectively distinguishing the water yield after changing, recomputate boundary condition at last, prepare the calculating of next time step.Carry out so repeatedly, can realize the control of strand temperature in real time, the fastest reaching on average just exported the water yield that once calculates in per 0.2 second.
Described boundary condition module 3, it can make number reason module 1 find the solution the reality of more fitting, and regulating pondage and distribution thereof accurately can solve the local quality problems of strand targetedly.Its ultimate principle is:
The steel grade that is collected by data acquisition equipment, the degree of superheat, casting speed, secondary cooling velocity, casting blank cross-section size, secondary cooling zone temperature, ambient temperature etc. have constituted the cooling boundary condition:
H wherein
Roll, h
Nat, h
Rad, h
SprayBe respectively heat transfer free convection between strand and roller thermal contact conductance and surrounding environment, radiation, and cooling water smoke between the forced-convection heat transfer coefficient.Border coefficient of heat transfer h in the described boundary condition module is step-by-step design, and adjusts in conjunction with test determination by on-the-spot historical data, number reason module found the solution fit actual, and accurately regulating pondage can solve the local quality problems of strand targetedly.
Described expansion module 4, it makes system be applicable to the casting machine of many structure types and the steel of many kinds.Its ultimate principle is: in the database of this module, the casting machine and the parameters such as roller row layout, nozzle placement thereof of multiple structure type are being deposited in tabulation; The technical parameter of many kinds steel is being deposited in tabulation, and after the technical parameter of a certain casting machine or a certain steel grade is input to data file, module will be made corresponding selection according to data file.
Generally speaking, the present invention is according to the variation of continuous casting process, calculates in real time and exports the surface, zoning and central temperature concerns over time, and the degree of agreement as a result that divides steel grade result of calculation and VAI-CPSS module to provide is better.
Before the present invention is come into operation, be three-level system with the structure of conticaster, the parameter input expansion module and the number reason modules such as technology of producing steel grade by production planning management department, finish the initialization of system.After the system start-up, promptly constantly follow the tracks of the execute-in-place state of a level system, cast Once you begin, number reason module promptly begins the temperature field according to current technological parameter and calculates, and send result of calculation to incremental PID control system, the difference of the target temperature that this system provides according to accounting temperature field and technological data bank is utilized control algolithm to ask and is calculated the regulated value of the water yield, and exports to the water yield.Boundary module is respectively distinguished the water yield according to the execute-in-place state and after changing, again the condition that revises the boundary is input to number reason modules, and number reason modules begin the calculating of next round, under the current device condition, can reach average per 0.2 second and promptly finish the water yield that output once calculates.Carry out so repeatedly, can in whole water time, control the strand temperature continuously in real time.
The present invention reaches the purpose that effective control is positioned at each cooling circuit control temperature by the water yield of each cooling circuit of control strand.The result shows that each temperature field, reference mark stability has clear improvement than static water meter control mode.On the result calculated of temperature field, in conjunction with solidus temperature, can predict the solidification end position easily, the enforcement of gently depressing etc. technology for solidification end provides advantageous conditions.
Result of implementation on several production lines shows that the present invention has guaranteed the stability of strand temperature to a great extent, to the influence of slab quality, can improve more than the strand qualification rate one percentage point when having improved the conticaster technique change.
Claims (6)
1, continuous casting billet secondary cooling dynamic control system comprises being connected in the execute-in-place being a level system of content and being level two between the three-level system of content with the production planning management that it is characterized in that: described level two comprises:
Number reason module, it is by the calculating to steel grade, the degree of superheat, casting speed, secondary cooling velocity, casting blank cross-section size, secondary cooling zone temperature, ambient temperature, the variation of determining these parameters is to casting blank surface temperature, the liquid core degree of depth and solidify the influence relation in final position, dynamically shows the temperature field of secondary cooling section strand and the position of solidification end;
Incremental PID control system, it implements water yield adjusting according to the difference of accounting temperature field and target temperature field, the speed and the temperature accumulation degree rate of temperature variation; This control system is found the solution according to following incremental proportional-integral-differential control algolithm:
Δ u wherein
Pd(n), Δ u
i(n) be respectively the variable quantity of the output water yield of calculating through proportion differential link, integral element, β is the integration separation value, and Δ u (n) is the variable quantity of the final output water yield;
Described number reason module, its input end are that three-level system, the boundary condition module of production planning management, the output terminal of expansion module link to each other with content respectively, and its output terminal links to each other with the input end of incremental PID control system; The output terminal of described incremental PID and execute-in-place are that a level system of content links to each other; Described its input end of boundary condition module is connected in a level system of execute-in-place; Its input end of described expansion module links to each other with the three-level system of production planning management.
2, continuous casting billet secondary cooling dynamic control system according to claim 1, it is characterized in that: described number reason module, it can be with the casting speed of transient state, water velocity, cast temperature, secondary cooling water temperature and environment temperature are as the structural parameters of known conditions substitution based on casting machine, nozzle placement, process conditions and astable solidifying-heat transfer equation of setting up, find the solution calculating, make the solidifying point position, fraction solid distribution and casting blank surface temperature in time feed back with the instantaneous variation of these main result parameters of variation of process conditions, thereby dynamically show the temperature field of secondary cooling section strand and the position of solidification end.
3, continuous casting billet secondary cooling dynamic control system according to claim 1, it is characterized in that: also comprise the boundary condition module in the described level two, it can make total reason module find the solution the reality of more fitting, accurately regulating pondage and distribution thereof can solve the local quality problems of strand targetedly.
4, continuous casting billet secondary cooling dynamic control system according to claim 3 is characterized in that; Border coefficient of heat transfer h in the described boundary condition module is a step-by-step design, adjust in conjunction with test determination by on-the-spot historical data, steel grade, the water yield, temperature, pulling rate field data according to the acquisition of network data substitute mode, make total reason module find the solution the reality of fitting, can accurately regulating pondage, can specific aim solve the local quality problems of strand.
5, continuous casting billet secondary cooling dynamic control system according to claim 1 is characterized in that: also comprise expansion module in the described level two, it makes system be applicable to the casting machine of many structure types and the steel products of many kinds.
6, continuous casting billet secondary cooling dynamic control system according to claim 5 is characterized in that; In the database of described expansion module, casting machine and roller thereof that multiple structure type is being deposited in tabulation are listed as layout, nozzle placement parameter; The parameter of many steel grades is being deposited in tabulation, and behind the parameter input data file of a certain casting machine, a certain steel grade, expansion module will be made corresponding selection according to data file.
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101844215B (en) * | 2009-03-27 | 2013-03-13 | 宝山钢铁股份有限公司 | Dynamic secondary cooling control method for slab continuous casting based on double-cooling mode |
| CN102380597B (en) * | 2011-10-28 | 2014-03-19 | 中冶赛迪工程技术股份有限公司 | Method for controlling secondary cooling water spraying width during continuous casting of plate blank |
| CN102814481B (en) * | 2012-08-29 | 2014-04-02 | 重庆大学 | Continuous casting secondary cooling dynamic control method based on online temperature measuring and heat transferring model |
| CN103008597A (en) * | 2012-12-31 | 2013-04-03 | 内蒙古包钢钢联股份有限公司 | System and method for automatically controlling second cooling of continuous casting |
| CN103447493B (en) * | 2013-09-05 | 2015-06-17 | 东北大学 | Control method of soft-reduction depressed region of wide and thick plate continuous casting blank |
| WO2015045148A1 (en) * | 2013-09-30 | 2015-04-02 | 新日鉄住金エンジニアリング株式会社 | Soft reduction method for continuous casting piece |
| CN104942247B (en) * | 2014-03-31 | 2017-06-13 | 北京明诚技术开发有限公司 | The control system and method for magnetic stirrer are adjusted in continuous casting working procedure |
| KR101903298B1 (en) * | 2014-07-16 | 2018-10-01 | 신닛테츠스미킨 카부시키카이샤 | Secondary cooling control method for continuous casting machine and secondary cooling control device |
| CN104237302B (en) * | 2014-09-22 | 2017-04-12 | 中冶南方工程技术有限公司 | Analysis system for thermal state performance test data of continuous-casting secondary cooling nozzle |
| CN105867123A (en) * | 2016-04-05 | 2016-08-17 | 上海十三冶建设有限公司 | PID parameter searching optimization control method for continuous casting secondary cooling water distribution |
| CN110315048A (en) * | 2019-07-24 | 2019-10-11 | 中冶赛迪工程技术股份有限公司 | A method of improving continuous casting billet transverse direction cooling temperature uniformity |
| CN110625079B (en) * | 2019-10-21 | 2020-12-15 | 北京科技大学 | Intelligent continuous casting electromagnetic stirring online control system and method |
| CN114905023B (en) * | 2022-06-01 | 2024-05-24 | 中冶赛迪工程技术股份有限公司 | Slab continuous casting cooling control method, system, medium and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4073332A (en) * | 1974-09-26 | 1978-02-14 | Centre De Recherches Metallurgiques Centrum Voor Research In De Metallurgie | Method of controlling continuous casting of a metal |
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