CN102343367B - Control method for lowering head and tail undercooled sections of steel plate in pressure jet cooling process - Google Patents
Control method for lowering head and tail undercooled sections of steel plate in pressure jet cooling process Download PDFInfo
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- CN102343367B CN102343367B CN201110313175.4A CN201110313175A CN102343367B CN 102343367 B CN102343367 B CN 102343367B CN 201110313175 A CN201110313175 A CN 201110313175A CN 102343367 B CN102343367 B CN 102343367B
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Abstract
The invention discloses a control method for lowering head and tail undercooled sections of a steel plate in a pressure jet cooling process. In the control method, water cooling equipment is arranged on a rolling line; and an automatic control system is configured. The method is characterized in that: the speeds of the head and tail passing cooling areas for the steel plate are controlled separately, so that the cooling time of the head part and the tail part of the steel plate is shortened by realizing quick passing; each cooling area is partitioned into a plurality of areas in a control program; the steel plate passing speed of each cooling area is designed by using the process controlling system; an area A serves as a head part speed shielding section in which the speed of the steel plate falls from 1.4 m/s after entering the cooling area to 1.138 m/s; an area B serves as a transition area for jointing the head part shielding section and a normal cooling section in which the speed of the steel plate falls from 1.138 m/s to 0.826 m/s; an area C serves as a normal cooling section which is different from head and tail speed shielding sections; and an area D serves as a tail part speed shielding section in which the speed of the steel plate rises from 0.879 m/s during normal cooling to 1.23 m/s. Due to the adoption of the method, the head and tail temperature shooting rates of the steel plate in the cooling process can be ensured, and a uniform temperature cooling effect in the length direction of the steel plate is achieved; and an adjusting method is easy, stable and reliable, and is suitable for medium plate production occasions.
Description
Technical field
The invention belongs to automation of rolling technical field, method, the particularly control method of cut deal roller repairing head and tail temperature hit rate that a kind of steel plate length direction target temperature controls.
Background technology
Thermal evenness controlling in cooling procedure is the major issue in cut deal cooling procedure.Particularly steel plate head and afterbody, generally all also exists problem excessively cold end to end.End to end the existence of super cooled sect can cause the non-uniform temperature in steel plate length direction and performance uneven, have a strong impact on the lumber recovery of Rolling production.
The reason analyzing steel plate generation excessively cold is end to end as follows:
1. steel plate is in cooling procedure, mainly comprises convection current and the radiation heat transfer process in inner heat transfer process and surface of steel plate and the external world.Because the heat dissipation capacity on length direction is far smaller than the heat dissipation capacity on thickness and width, the heat transfer on length direction can be ignored, and diabatic process is considered as along the Two-Dimensional Heat process on steel plate thickness and width.But steel plate head and and afterbody but there is convection current and the radiation heat transfer process of length direction, there is super cooled sect end to end when therefore steel plate enters cooling after going out milling train.
2. according to the feature of ultrafast cool equipment (ADCOS-PM) form, steel plate head is when entering cooling, the direction of spraying due to most of nozzle is the traffic direction along steel plate, add that the drainage effect of steel plate head portion is better than other positions (in Cooling Process for Steel Plate Based, there is a large amount of cooling waters in surface of steel plate, have a strong impact on the heat transfer effect of steel plate), so the cooling effect of part is better than the cooling effect of other positions end to end, cause steel plate excessively cold end to end.
3. descend the cooling water of nozzle to spray many higher than roller-way face, when ordinary circumstance steel plate enters before cooling, lower collector pipe water is opened, therefore when steel plate head portion is through cooling zone, retain a large amount of lower nozzle cooling water (spraying the part higher than roller-way face), cause steel plate head portion excessively cold.
The method of the reduction commonly used of current medium plate cooling after rolling system super cooled sect is end to end generally cover control method by the water yield end to end to realize.Different according to control valve group configuration, be divided into and cut water management and flow-control two kinds end to end end to end.Cut water management end to end to realize by the adjustment collector opening time, pass through collector after between cooling water inlet zone when steel plate head and just spray water, just stop collector spraying water when afterbody arrives between cooling water inlet zone equally.Cut water management end to end and depend on the measure cooperations such as the quick response of micro-tracking, open and close valve accurately.Collector flow when flow-control is passed through between cooling water inlet zone end to end by adjustment steel plate end to end realizes, according to length and the temperature setting sheltering coefficient (cover length and cover flow) of steel plate head low-temperature zone, flow-control depends on the accurately response fast of flow control valve end to end.Above two kinds of control mode stability requirements to water system are higher simultaneously, if after-rolling cooling system adopts elevated tank (or high-order water tower) to supply water, pressure of supply water is more stable, now according to open and close valve or the flow control valve of response fast, then adopt above two kinds of modes can realize to a certain extent covering end to end, but the precision of covering (shielding section length and temperature accuracy) is but difficult to ensure.
Yet there are no and have the relevant report adopting the speed of adjustment end to end through cooling zone to carry out the method that super cooled sect end to end controls both at home and abroad.
Summary of the invention
The object of this invention is to provide in a kind of pressure injection cooling procedure the control method reducing steel plate super cooled sect end to end, by steel plate end to end by speed adjustment during cooling zone, improve the steel plate head and tail temperature hit rate of injection stream.
The control method of steel plate super cooled sect is end to end reduced in this pressure injection cooling procedure of the present invention, comprise automation control system rolling line arranging water cooling equipment and configures on rolling line roll line control, cooling zone length is 8m, establishes 9 groups of nozzles altogether, and initial segment is strong cooling section; It is characterized in that carrying out independent speeds control by cooling zone end to end to steel plate, with quickly through and shorten cool time of steel plate head and afterbody; In a control program cooling zone is divided into some districts, each cooling zone steel plate Negotiation speed of design is performed by Process Control System, A district is head speed shielding section, after steel plate speed enters cooling zone by 1.4m/s, reduce speed now to 1.138m/s, B district is transitional region, play the effect be connected between head shadow section and normal cooling section, 0.826m/s is decelerated to from 1.138m/s, C district is normal cooling section (the non-shielding section of speed end to end), D district is tail speed shielding section, from the normal 0.879m/s raising speed cooled to 1.23m/s.
Because the steady time of the water in pressure injection process is longer, lower than control response requirement, the method for adjustment steel plate head portion cool time is therefore adopted to reduce super cooled sect end to end from another point of view.
During Cooling Process for Steel Plate Based, before entering cooling zone, Process Control System is sent to basic automatization control by cooling code (nozzle open mode, nozzle flow, steel plate are by the roller table speed etc. of cooling zone), and Basic automation control system realizes cooling code on cooling device.In cooling procedure, the water yield of the quantity that namely open mode of nozzle is opened and position and nozzle generally can not change due to the restriction by water system, therefore the method reducing steel plate super cooled sect cooling temperature drop end to end only has adjustment cool time, namely adjusts steel plate end to end by speed during cooling zone.In cut deal cooling procedure, in order to realize the Homogeneous cooling in steel plate total length direction, be generally initial temperature and a roll table accelerating, and the invention reside in independent speeds control end to end, namely section end to end is irrelevant by the speed of cooling zone and other positions of steel plate.
Accompanying drawing explanation
Fig. 1 is that steel plate is by rate curve during cooling zone;
Fig. 2 is the profiling temperatures do not dropped into when covering end to end;
Fig. 3 drops into profiling temperatures when covering end to end;
Fig. 4 is steel grade X70 cooling metal sheets PDI parameter.
Detailed description of the invention
The control method of steel plate super cooled sect is end to end reduced in a kind of pressure injection cooling procedure, the cooling settings adopted is cooling zone length is 8m, have 9 groups of nozzles, the direction of the cooling water that nozzle ejects is front and back arranged crosswise, initial segment is high-strength cooling zone, it is characterized in that utilizing the cool time configuring on rolling line and the automation control system of roll line control adjustment steel plate is changed to steel plate head and afterbody by the speed of cooling zone, thus control the cooling temperature drop of steel plate head and afterbody, with reach control steel plate end to end with the uniform object of whole plate chilling temperature.
The detailed description of the invention of control steel plate of the present invention super cooled sect is end to end as follows:
Embodiment cooling metal sheets used and technological requirement cooling metal sheets PDI parameter as shown in Figure 4.When steel plate is rolled down to passage third from the bottom, cooling procedure control system provides cooling code automatically, comprise nozzle configuration, nozzle flow and roller table speed, wherein roller table speed comprises initial velocity, roll table accelerating and the roller table speed of steel plate diverse location through cooling zone; Rolling line takes head shadow measure simultaneously.
The speed of super cooled sect is covered control procedure and is end to end: steel plate starts advance from milling train to controlled cooling model device and slow down gradually to throw steel speed (v=4.0m/s), when steel plate head marches to the position apart from 8m before cooling zone, steel plate speed is 1.4m/s, see Fig. 1, the speed started afterwards according to Controlled cooling system process machine is given moves to A district.Be 20 points relative to the speed that now Controlled cooling system process machine provides, the rate curve of visible 1st o'clock to the 20th in Fig. 1, namely activating the speed of each position in cooling zone, (the normal cooling velocity of process machine setting is the speed of in rate curve the 8th to steel plate, accelerating sections is the 8th point ~ 14th for the normal cooling section of head, tail removed by steel plate, the velocity amplitude of visible 8th o'clock to the 14th in Fig. 1, speed interval is 0.835 ~ 1.038m/s.Steel plate is when moving to cold-zone device portal from the position of cold front 8m, and steel plate is in deceleration.Steel plate head enters cooling device and lights from the 2nd, and start head speed masking process, now roller table speed is 1.17m/s.The scope of speed adjustment is provided by Process Control System, what the temperature of steel plate head that Process Control System detects according to milling train outlet pyrometer and precomputation obtained wear due to head the temperature drop that water causes gives velocity compensation, velocity compensation is generally 1.3 ~ 1.8 times of normal cooling velocity, hidden position is steel plate head this was interval at the 2nd o'clock to the 5th, and each spot speed now set is respectively: the 2nd ~ 3 1.149m/s, the the 3rd ~ 4: 1.139 m/s, the the 4th ~ 5: 1.138 m/s.When steel plate head is by the 5th, between the transition zone entering head shadow section and normal cooling section, the setting of B district the 5th point ~ the 8th spot speed need consider cover end to end degree, with normally cool being connected of commencing speed, be decelerated to 0.826m/s from 1.138m/s, start to perform normal cooling velocity to when the 8th.C district is normal cooling section (the non-shielding section of speed end to end), and D district is afterbody shielding section, and steel plate Negotiation speed is from the normal 0.879m/s raising speed cooled to 1.23m/s.When steel plate tail arrives cooling device entrance the 14th, start afterbody masking process, namely afterbody is quickly through cooling zone.Be afterbody shielding section between the 14th ~ 20, now consider the ability of cooling device rollgang, the intensity etc. of covering end to end, set the rate curve of this section.In this example, the speed of the 14th is 0.879m/s, and the 15th spot speed is promoted to 1.038m/s.This speed promotes relevant with the process characteristic of cooling device, and the front end of cooling device is high strength cooling zone, and therefore in the process of the 14th ~ 15, steel plate operation acceleration is larger.In the D district process of the 15th ~ 20, steel plate is with less speed by cooling device, and setting speed is now respectively 1.066 m/s, 1.085 m/s, 1.133 m/s, 1.172 m/s, 1.230 m/s).Steel plate tail leaves cooling device the 20th time, and whole cooling procedure terminates.
Illustrate at these needs: above-mentioned " shaded areas " one word only use, without any the measure of blocking current between this section of cooling zone of this method.Although the measure of blocking of at present still crossing cold problem end to end at the mitigation steel plate adopted in the industry stops to drop on steel plate to reduce cooling water flow, but the inventive method but just conversion rate allow steel plate end to end quickly through cooling zone, " speed shielded area " is set in a control program." when steel plate head enters cooling zone; start to carry out length direction thermal evenness controlling; occurring large temperature fluctuation for avoiding the big ups and downs of roller table speed and steel plate length direction; before carrying out length direction thermal evenness controlling, B district is set to transitional region; this region is also head shadow region simultaneously, making steel plate be down to target initial velocity.Enter C district, length direction thermal evenness controlling region afterwards.Because the cold situation of mistake of afterbody is in the ordinary course of things obvious unlike head, therefore afterbody covers accelerating through of measure and relatively will relax, as shown in D district in region in Fig. 1.
Figure 2 shows that the temperature curve in the steel plate length direction before adopting this patent method, visible all exist larger super cooled sect in steel plate head and afterbody, temperature spot particularly in frame, obviously low much than the temperature in the middle of steel plate, have a strong impact on steel plate length direction temperature homogeneity, thus cause the lower of lumber recovery.When adopting method of the present invention to control cooling procedure, the Temperature Distribution in steel plate length direction as shown in Figure 3, the super cooled sect of visible Fig. 3 light plate head and afterbody is obviously short than Fig. 2 a lot, illustrate that control method serves effect, this is to significant with the raising of the performance uniformity in Plate Production process, lumber recovery etc.
Claims (5)
1. reduce a control method for steel plate super cooled sect end to end in pressure injection cooling procedure, be included on rolling line and arrange water cooling equipment, configure the automation control system controlled cooling, cooling zone length is 8m, establishes 9 groups of nozzles altogether, and initial segment is strong cooling section, it is characterized in that Controlled cooling system process machine provides 20 spot speed curves, by cooling zone, independent speeds control carried out end to end to steel plate, with quickly through and shorten cool time of steel plate head and afterbody, in a control program cooling zone is divided into some districts, each cooling zone steel plate Negotiation speed of design is performed by Process Control System, 1 ~ 5, A district is head speed shielding section, after steel plate speed enters cooling zone by 1.4m/s, reduce speed now to 1.138m/s, 5 ~ 8, B district is transitional region, play the effect be connected between head shadow section and normal cooling section, 0.826m/s is decelerated to from 1.138m/s, 8 ~ 14, C district is the normal cooling section of the non-shielding section of speed end to end, 14 ~ 20, D district is tail speed shielding section, from the normal 0.879m/s raising speed cooled to 1.23m/s.
2. in pressure injection cooling procedure according to claim 1, reduce the control method of steel plate super cooled sect end to end, what it is characterized in that the temperature of steel plate head that Process Control System detects according to milling train outlet pyrometer and precomputation obtain wears due to head the temperature drop that water causes and gives velocity compensation, and velocity compensation is 1.3 ~ 1.8 times of normal cooling velocity.
3. in pressure injection cooling procedure according to claim 1, reduce the control method of steel plate super cooled sect end to end, when it is characterized in that the position of 8m before steel plate head marches to distance cooling zone, steel plate speed is 1.4m/s, the speed reduction started afterwards according to Controlled cooling system process machine is given moves to A district, steel plate head enters cooling device and lights from the 2nd, start head speed masking process, now roller table speed is 1.17m/s, hidden position is that steel plate head was in the 2nd o'clock to the 5th this interval, the each spot speed now set is respectively: the 2nd ~ 3 1.149m/s, 3rd ~ 4 1.139m/s, 4th ~ 5 1.138m/s.
4. in pressure injection cooling procedure according to claim 1, reduce the control method of steel plate super cooled sect end to end, when it is characterized in that steel plate head by the 5th, enter the excessive B district of head shadow section and normal cooling section, the setting of B district the 5th point ~ the 8th spot speed should consider to cover end to end degree, with normally cool being connected of commencing speed, be decelerated to 0.826m/s from 1.138m/s, start to perform normal cooling velocity to when the 8th.
5. in pressure injection cooling procedure according to claim 1, reduce the control method of steel plate super cooled sect end to end, it is characterized in that the D district between the 14th ~ 20 is afterbody shielding section, when steel plate tail arrives cooling device entrance the 14th, start afterbody masking process, now consider the ability of cooling device rollgang, the intensity of covering end to end, set the rate curve of this section: the 14th spot speed 0.879m/s, 15th spot speed is promoted to 1.038m/s, in the D district of the 15th ~ 20, setting speed is respectively 1.066m/s, 1.085m/s, 1.133m/s, 1.172m/s, 1.230m/s, steel plate tail leaves cooling device the 20th time, and whole cooling procedure terminates.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103894425B (en) * | 2013-12-30 | 2016-06-29 | 北京首钢股份有限公司 | The control method of finishing temperature and device |
| CN106493179B (en) * | 2016-12-25 | 2018-08-21 | 首钢集团有限公司 | A kind of method that section length calculating is subcooled in steel plate Cooling Process end to end |
| CN109759445A (en) * | 2019-01-25 | 2019-05-17 | 舞阳钢铁有限责任公司 | Control the production method of TMCP shape steel plate performance difference end to end |
| CN114472548B (en) * | 2020-10-23 | 2024-06-04 | 宝山钢铁股份有限公司 | System and method for reducing head-tail temperature difference in ultra-long plate rolling process |
| CN115318844A (en) * | 2022-08-25 | 2022-11-11 | 湖南华菱湘潭钢铁有限公司 | Cooling process for producing medium steel plate |
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Application publication date: 20120208 Assignee: Guangxi advanced aluminum processing Innovation Center Co.,Ltd. Assignor: Northeastern University Contract record no.: X2021210000024 Denomination of invention: A control method for reducing the head and tail supercooling section of steel plate in the process of pressure jet cooling Granted publication date: 20150114 License type: Common License Record date: 20210520 |
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Application publication date: 20120208 Assignee: Hebei Puyang new material industry Co., Ltd Assignor: Northeastern University Contract record no.: X2021210000034 Denomination of invention: A control method for reducing the undercooling section at the head and tail of steel plate in the process of pressure jet cooling Granted publication date: 20150114 License type: Common License Record date: 20210804 |