CN105327949A - Flow control method for rolling temperature of hot rolled steel strip - Google Patents
Flow control method for rolling temperature of hot rolled steel strip Download PDFInfo
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- CN105327949A CN105327949A CN201510831607.9A CN201510831607A CN105327949A CN 105327949 A CN105327949 A CN 105327949A CN 201510831607 A CN201510831607 A CN 201510831607A CN 105327949 A CN105327949 A CN 105327949A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B2037/002—Mass flow control
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Abstract
The invention provides a flow control method for the rolling temperature of a hot rolled steel strip and belongs to the technical field of rolled steel automatic control. The method comprises: reading plate blank PDI data, equipment parameters and rolling temperature model parameters, and extracting the actual measurement values of pyrometers when the steel strip reaches a finish rolling inlet and a finish rolling outlet; determining the given configuration and flow of the material specification of beginning valve and headers; according to the given flow and the rolling temperature model of each group of headers, determining the convective heat transfer coefficient of each group of headers; according to the rolling temperature model, calculating total flow required by cooling from the finish rolling outlet to a rolling inlet; determining total valve opening number required by cooling, and sending the set configuration to a level I basic automation executor; and carrying out feedback calculation according to the actual rolling temperature, regulating the opening and closing state of headers in a fine tuning zone, and ensuring a target rolling temperature. The method can stably control the rolling temperature index, ensure that the first block of an another specification of strip steel and a thick specification of strip steel can stably pass, improve the rolling temperature hit rate and improve the quality performance of a product.
Description
Technical field
The present invention relates to a kind of flow control methods of hot steel strip coiling temperature, belong to automation of rolling control technology field.
Background technology
Coiling temperature is the important technical parameter of influence zone structure of steel performance, is also the important indicator in hot rolling production control.In hot-strip is produced, the control of coiling temperature mainly relies on the configuration of section cooling collector group to carry out open to shut to regulate timely, in order to obtain the product of acceptable performance, needs to carry out high-precision control to the quantity of collector configuration and flow.Usually, each group of main valve of section cooling battery limits is pneumatic open and close valves, the control of valve opening and flow is being debugged or manual adjustment between turn(a)round, and regulate roughly equal by each group of valve flow, the setting of section cooling model carries out in the assumed condition that each group of flow is equal.
Wang Qiang discloses 1780 hot-rolling coiling temperature control systems in May, 2007, introduces from the laminar cooling system of aspect to 1780 hot rollings such as equipment situation, systemic-function and cooling jigs.In order to make the band steel capital of different steel grade, different size can reach good cooling effect, laminar cooling system is steel grade endothermic character, thickness and coiling temperature situation more, divides different layers other.When slab is extracted out and arrived the tracing area of specifying from heating furnace, perform corresponding calculating and setting: the setting of initial valve door model, the setting of dynamic valve pattern, FEEDBACK CONTROL and self study.Shi Rui, Yin Wei, Cai Liang disclose 1780 Coiling Temperature of Hot Tandem Rolled Strip Controlling model researchs in January, 2012, teach mathematical formulae and practical effect that this steel 1780 Coiling Temperature of Hot Tandem Rolled Strip controls the rear laminar flow cooling control model of transformation.Oiler temperature control mainly contains 5 parts: setting, coiling temperature feedforward control, coiling temperature FEEDBACK CONTROL (accurate adjustment), finishing temperature FEEDBACK CONTROL, self study; Oiler temperature control model adopts some Mathematical Modelings to carry out the cold water spray configuration of computation layer.
In existing Strip Steel Coiling Temperature control technology, produce the high accuracy of changing first block of specification band steel and heavy gauge steel strip coiling temperature and control to be still difficult point, coiling temperature curve is also unstable.Publication number be 102166582 Chinese patent application disclose a kind of method improving control precision of coiling temperature on August 31st, 2011, adopting in the method successively decreases along rolling direction arranges each group of collector discharge and the different cooling strategy of corresponding selection and proportioning heat transfer coefficient, improves control precision of coiling temperature when ensureing the main cold energy power of leading portion.In the given parameters of each group of collector discharge, given a certain value range simply, and the value range of certain section of collector group flow is the same, such setting is inappropriate for the enterprise that production material specification is more, so need to determine that rational flow is given, to improve control precision of coiling temperature better.
Summary of the invention
The object of this invention is to provide a kind of flow of hot steel strip coiling temperature to locking control method, the difference that the band steel solving unlike material specification needs cooling water inflow given, thus easily cause the problem of coiling temperature norm controlling instability because of collector opening and closing.Rolling scaduledly thick gradually changing in process from being thinned to, by determining the given of each group of given flow and initial valve and cooling strategy, both the ability that leading portion large discharge cools fast had been ensured, the water yield fluctuation making again back segment valve opening and closing cause is less, thus coiling temperature norm controlling is stablized, and improve coiling temperature hit rate, improve product quality performance.
The present invention is on existing hot steel strip coiling temperature Controlling model basis, according to certain hot rolling field apparatus condition and actual production and experimental data, return the corresponding relation obtaining being with steel cooling temperature drop and collector group flow each under different initial valve, provide a kind of method of flow-control of hot steel strip coiling temperature, comprise following steps:
Step 1, reads slab PDI data, device parameter and coiling temperature model parameter, extracts the measured value of the pyrometer when being with steel to arrive finish rolling entrance and outlet;
Wherein, slab PDI packet rubbing board base number, steel grade, slab specification, product objective thickness, finish to gauge target temperature and batch target temperature;
Step 2, determine the initial valve of this material specification and collector configuration flow given;
Do not shown by the inquiry layer relevant to steel grade and finished product thickness, determine which of collector group to organize which root as initial valve from.
The given flow Flow of i-th group of collector
icomputing formula be:
Wherein, A
0represent first group of upper header given flow, in setting, lower collector pipe flow is consistent, C
0for the given coefficient factor of collector group flow.
End collector group is as feedback accurate adjustment section, and given flow is 35% of valve opening.
Step 3, according to each group of collector given flow and coiling temperature model, determines each group of collector convection transfer rate;
Step 4, calculates to be exported to from finish rolling according to coiling temperature model and batches total flow needed for entrance temperature drop;
Step 5, determines the valve opening sum cooled needed for temperature drop, sends to one-level basic automatization to perform the setting configuration of initial for collector valve and valve opening number;
Step 6, carries out feedback according to actual coiling temperature and calculates, and adjustment accurate adjustment district collector open and-shut mode, ensures target coiling temperature.
The present invention passes through each group of given control coiling temperature of collector flow, improve hot steel strip coiling temperature hit rate, especially the temperature fluctuation that the coiling temperature curve changing first piece of specification and heavy gauge steel strip is caused by collector opening and closing when dynamically setting is very little, achieve the control method that a kind of coiling temperature flow is given, the present invention compared with the conventional method, has following good effect:
(1) under existing equipment condition, this method proposing can to the strategy of the follow-up slow cooling of the first rapid cooling of band steel, and coiling temperature curve is steady, ensure that coiling temperature and the uniformity of band steel, and improves properties of product;
(2) to each collector group setting different flow and when determining initial valve according to material specification, the high-precision water yield of band steel that the method can meet unlike material specification is given, this given curve is power function, leading portion cooling manifold group flow set-point is distinguished obviously, large discharge rapid cooling can be met, the given water yield decline trend of follow-up collector group is mild, and while ensureing the cooling capacity of think gauge, the water yield fluctuation that can also slow down because dynamically setting opening and closing manifold applications causes causes temperature instability problem.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the flow control methods of hot steel strip coiling temperature of the present invention;
Fig. 2 is each group of given schematic diagram of collector flow.
Detailed description of the invention
According to embodiment and respective drawings, the present invention is further described below.
The method of the flow-control of a kind of hot steel strip coiling temperature of the present invention, as shown in Figure 1, the following describes each step.
Step 1, reads slab PDI data, equipment and coiling temperature Parameters in Mathematical Model, extracts the measured value of pyrometer when band steel arrives finishing mill entrance and exports, does data encasement for model calculates.
Slab PDI packet rubbing board base number, steel grade, slab specification, product objective thickness, finish to gauge target temperature and batch target temperature etc.Device parameter mainly refers to the relevant parameter of section cooling area equipment collector, comprises collector group number, collector radical, header length and collector maximum stream flow etc.Coiling temperature model parameter comprises convection transfer rate, self study coefficient, the ambient temperature effect factor etc., according to the parameter that concrete selected coiling temperature model read needs.
Step 2, determine the initial valve of this material specification and collector configuration flow given.
Initial valve is not shown to inquire about by the layer relevant to steel grade and finished product thickness, confirms which of collector group to organize which root as initial valve from.
Such as: straight carbon steel Q235B finished product target thickness is that the initial valve layer of 3mm is not worth for (1,1), its implication is sprayed water from first group first of collector group as initial valve.
The given flow Flow of i-th group of collector
icomputing formula be:
Wherein, A
0represent first group of upper header given flow, assuming that upper lower collector pipe flow is consistent; C
0for the given coefficient factor of collector configuration flow.
It should be noted that the given coefficient-0.27606 of collector group flow is according to existing equipment and production requirement, by mass data matching out, therefore, according to the difference that section cooling district collector group number and cooling capacity divide, C can be revised by trace
0, C
0for positive number, span is [0.5,1.5].
Batch target temperature to control better, last collector group is as feedback accurate adjustment section, and given flow is generally 35% of valve opening.
Step 3, according to each group of collector given flow and coiling temperature model, determines each group of collector convection transfer rate;
Step 4, calculates to be exported to from finish rolling according to coiling temperature model and batches total flow needed for entrance temperature drop;
Step 5, determines the initial valve of collector and the cooling valve opening sum needed for temperature drop, sends to one-level basic automatization to perform such setting configuration;
Step 6, carries out feedback according to actual coiling temperature and calculates, and adjustment accurate adjustment district collector open and-shut mode, ensures target coiling temperature.As shown in Figure 1, what calculate reality batches inlet temperature, when meeting target temperature range, terminating coiling temperature and controlling, if discontented foot-eye temperature range, then continue to go to step 4 execution, until meet target temperature range.
Embodiment
The present invention is for certain middle width strip 950 hot rolling line, and composition graphs 2 is illustrated as follows:
Step 1, read slab PDI data, slab number is YG151004366, and steel grade is 08AL, and slab specification is 165*770*10000mm, product objective thickness is 3.0mm, finish to gauge target temperature 865 DEG C, batches target temperature 550 DEG C, fetch equipment constant and coiling temperature Parameters in Mathematical Model, before slab arrival finishing mill, entrance pyrometer measured value is 988 DEG C, and arriving finishing mill outlet pyrometer measured value is 851 DEG C; Layer cold area is totally 15 groups of collectors, often organizes 4 cooling units for first 13 groups, often organizes 8 cooling units, and is all equipped with flowmeter for often organizing collector, can examine inventive flow better to locking control method by flowmeter for latter two groups.
Step 2, determine the initial valve of this material specification and collector configuration flow given;
Initial valve is not shown to inquire about by the layer relevant to steel grade and thickness, confirms from the 5th group the 1st as initial valve.
Suppose that on each group, lower collector pipe flow set is consistent, A
0get first group of upper header given flow 116.18m
3/ h, C
0for the given coefficient factor of collector configuration flow, value is 1.0, then the given computing formula of upper header flow is:
Flow
i＝116.18×i
-0.27606×1.0
Wherein, i represents i-th group of collector, Flow
irepresent i-th group of collector given flow, unit is m
3/ h.
Obtain each collector given flow according to formula above as follows, unit is m
3/ h:
Flow
1＝116；Flow
2＝96；Flow
3＝88；Flow
4＝80；
Flow
5＝75；Flow
6＝71；Flow
7＝68；Flow
8＝65；Flow
9＝63；Flow
10＝62；
Flow
11＝59；Flow
12＝58；Flow
13＝57；Flow
14＝56；Flow
15＝35。
Step 3, given according to each group of collector flow, determine that each group of collector convection transfer rate is between 0.8-1.2;
Step 4, calculates to be exported to from finish rolling according to coiling temperature model and batches total flow needed for entrance temperature drop, preset and be decided to be 942m
3/ h.
Step 5, determines that the initial valve of collector is 5, and valve opening number is preset and is decided to be upper and lower collector totally 32, wherein 26, coarse adjustment district, 6, accurate adjustment district, dynamically trace adjustment during setting;
Step 6, carries out feedback according to actual coiling temperature and calculates, and adjustment accurate adjustment district collector open and-shut mode, ensures target coiling temperature 550 DEG C.
Adopt the present invention to use a kind of reeling temperature controlling method of the different given flow of different collector group, the temperature fluctuation that the coiling temperature curve changing first piece of specification and heavy gauge steel strip is caused in collector opening and closing is very little, improves hot steel strip coiling temperature hit rate.
Above examples describe the specific embodiment of the present invention; but it should be understood that; here concrete description should not be construed the restriction to the spirit and scope of the invention; one of ordinary skilled in the art to the various amendments that above-mentioned example is made, belongs to the scope that the present invention protects upon review of the specification.
Claims (3)
1. a flow control methods for hot steel strip coiling temperature, is characterized in that, implementation step is as follows:
Step 1, reads slab PDI data, device parameter and coiling temperature model parameter, extracts the measured value of the pyrometer when being with steel to arrive finish rolling entrance and outlet;
Wherein, slab PDI packet rubbing board base number, steel grade, slab specification, product objective thickness, finish to gauge target temperature and batch target temperature;
Step 2, determine the initial valve of this material specification and collector configuration flow given;
Do not shown by the inquiry layer relevant to steel grade and finished product thickness, determine which of collector group to organize which root as initial valve from;
The given flow Flow of i-th group of collector
icomputing formula be:
wherein, A
0represent first group of upper header given flow, in setting, lower collector pipe flow is consistent; C
0for the given coefficient factor of collector group flow;
Step 3, according to each group of collector given flow and coiling temperature model, determines each group of collector convection transfer rate;
Step 4, calculates to be exported to from finish rolling according to coiling temperature model and batches total flow needed for entrance temperature drop;
Step 5, determines the valve opening sum cooled needed for temperature drop, sends to one-level basic automatization to perform the setting configuration of initial for collector valve and valve opening number;
Step 6, carries out feedback according to actual coiling temperature and calculates, and adjustment accurate adjustment district collector open and-shut mode, ensures target coiling temperature.
2. the flow control methods of a kind of hot steel strip coiling temperature according to claim 1, is characterized in that, in described step 2, the flow of given last collector group is 35% of valve opening.
3. the flow control methods of a kind of hot steel strip coiling temperature according to claim 1, is characterized in that, in described step 2, and setting C
0span be [0.5,1.5].
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107999547A (en) * | 2018-01-16 | 2018-05-08 | 中冶赛迪电气技术有限公司 | The self-learning method and device of a kind of section cooling |
| CN110064668A (en) * | 2019-04-25 | 2019-07-30 | 河钢股份有限公司承德分公司 | The method and terminal device of oiler temperature control |
| CN110799276A (en) * | 2017-06-26 | 2020-02-14 | 安赛乐米塔尔公司 | Method and electronic device for determining the temperature of a metal strip, associated control method, computer program, control device and hot rolling installation |
| CN110814053A (en) * | 2019-11-15 | 2020-02-21 | 中冶华天工程技术有限公司 | Intelligent calculation method for reverse self-decision temperature control of bar water tank based on trial and error method |
| CN110877055A (en) * | 2019-10-31 | 2020-03-13 | 河钢股份有限公司承德分公司 | Method for improving hot-rolled steel strip tail coiling temperature hit |
| CN110883105A (en) * | 2019-11-15 | 2020-03-17 | 中冶华天工程技术有限公司 | Method for real-time adjustment of parameters of water tank for controlled cooling after rolling of hot-rolled rebar |
| CN113649421A (en) * | 2021-07-07 | 2021-11-16 | 阳春新钢铁有限责任公司 | Control system and method for temperature drop compensation of finish rolling inlet |
| CN113857264A (en) * | 2021-09-27 | 2021-12-31 | 日照宝华新材料有限公司 | SPA-H hot-rolled coil shape control method |
| CN114535316A (en) * | 2022-02-08 | 2022-05-27 | 邯郸钢铁集团有限责任公司 | Method for controlling coiling temperature of hot-rolled high-strength dual-phase steel |
| CN114850226A (en) * | 2022-03-03 | 2022-08-05 | 河钢乐亭钢铁有限公司 | Steel rolling process controlled cooling method |
| US11745237B2 (en) | 2018-03-12 | 2023-09-05 | Sms Group Gmbh | Cooling unit of a laminar cooling device |
| CN116833226A (en) * | 2023-06-21 | 2023-10-03 | 北京冶自欧博科技发展有限公司 | A coiling temperature control system based on dynamic adjustment |
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Cited By (18)
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|---|---|---|---|---|
| CN110799276A (en) * | 2017-06-26 | 2020-02-14 | 安赛乐米塔尔公司 | Method and electronic device for determining the temperature of a metal strip, associated control method, computer program, control device and hot rolling installation |
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| CN110877055A (en) * | 2019-10-31 | 2020-03-13 | 河钢股份有限公司承德分公司 | Method for improving hot-rolled steel strip tail coiling temperature hit |
| CN110883105B (en) * | 2019-11-15 | 2021-06-08 | 中冶华天工程技术有限公司 | Method for adjusting parameters of controlled cooling optimizing water tank of hot-rolled deformed steel bar in real time after rolling |
| CN110814053B (en) * | 2019-11-15 | 2021-04-20 | 中冶华天工程技术有限公司 | Intelligent calculation method for reverse self-decision temperature control of bar water tank based on trial method |
| CN110883105A (en) * | 2019-11-15 | 2020-03-17 | 中冶华天工程技术有限公司 | Method for real-time adjustment of parameters of water tank for controlled cooling after rolling of hot-rolled rebar |
| CN110814053A (en) * | 2019-11-15 | 2020-02-21 | 中冶华天工程技术有限公司 | Intelligent calculation method for reverse self-decision temperature control of bar water tank based on trial and error method |
| CN113649421A (en) * | 2021-07-07 | 2021-11-16 | 阳春新钢铁有限责任公司 | Control system and method for temperature drop compensation of finish rolling inlet |
| CN113857264A (en) * | 2021-09-27 | 2021-12-31 | 日照宝华新材料有限公司 | SPA-H hot-rolled coil shape control method |
| CN114535316A (en) * | 2022-02-08 | 2022-05-27 | 邯郸钢铁集团有限责任公司 | Method for controlling coiling temperature of hot-rolled high-strength dual-phase steel |
| CN114535316B (en) * | 2022-02-08 | 2023-10-03 | 邯郸钢铁集团有限责任公司 | Coiling temperature control method for hot-rolled high-strength dual-phase steel |
| CN114850226A (en) * | 2022-03-03 | 2022-08-05 | 河钢乐亭钢铁有限公司 | Steel rolling process controlled cooling method |
| CN116833226A (en) * | 2023-06-21 | 2023-10-03 | 北京冶自欧博科技发展有限公司 | A coiling temperature control system based on dynamic adjustment |
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