CN103008597A - System and method for automatically controlling second cooling of continuous casting - Google Patents
System and method for automatically controlling second cooling of continuous casting Download PDFInfo
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- CN103008597A CN103008597A CN2012105894622A CN201210589462A CN103008597A CN 103008597 A CN103008597 A CN 103008597A CN 2012105894622 A CN2012105894622 A CN 2012105894622A CN 201210589462 A CN201210589462 A CN 201210589462A CN 103008597 A CN103008597 A CN 103008597A
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Abstract
The invention provides a system and method for automatically controlling second cooling of continuous casting, and provides a second cooling control system based on compressed air temperature. The system comprises a temperature detecting unit, a pressure detecting unit, a regulating unit, a programmable logic control unit and an upper computer unit, and is characterized in that the pressure detecting unit, the temperature detecting unit and the regulating unit are respectively connected with the programmable logic control unit through cables; and the upper computer unit is connected with the programmable logic control unit through a network. The programmable logic control unit is used for controlling a pneumatic regulating valve to repeatedly act until the working pressure reaches a set pressure after dynamically regulating a set working pressure value of second cooled compressed air. According to the invention, temperature fluctuation of the compressed air is controlled as eliminable disturbance, the response speed of second cooling to the temperature fluctuation of the compressed air is increased, influences of the temperature fluctuation of the compressed air on the surface temperature of a casting blank can be rapidly compensated by changing the working pressure of the compressed air, and the defect that control factors are incomprehensively considered in the traditional control method is overcome.
Description
Technical field
The invention belongs to conticaster secondary cooling automatic control system and its control method.
Background technology
Current continuous casting installation for casting is widely used in metallurgy industry.Generally, continuous casting process is：Molten steel is injected into crystallizer through excessive bag, middle bag, enters secondary cooling zone after once cooling down in a crystallizer, and the strand with wick-containing is formed after secondary cooling in secondary cooling zone.
How the high-quality work of efficient stable is people's issues that need special attention always to conticaster, secondary cooling intensity is improper to be influenceed cc billet surface quality or even induce bleed-out, therefore the secondary cooling control strategy of application is to improve slab quality, improve the key of casting efficiency..
Secondary cooling control system is one of key factor of conticaster efficient stable production in the conticaster production of metallurgical industry, current two it is cold be but generally that the aerosol type of cooling is cooled down by the collective effect of cooling water and compressed air to strand.
In recent years as the disturbance factor that in the fast development of science and technology, the control of the water distribution quantity of two cold-zones is introduced is more and more comprehensive, such as liquid steel temperature fluctuation, the degree of superheat are fluctuated, secondary cooling water fluctuating temperature etc..
The control principle control method of current secondary cooling scheme can be summarized as following expression：
Qi=aiv2+ biv+ci+DiΔT1+EiΔT2
Wherein, Qi represents the water of two certain cold cooling section, and unit is L/min, and a, b, c are that secondary cold model calculates the pulling rate coefficient obtained；ΔT1Represent degree of superheat undulating value, DiRepresent degree of superheat coefficient；EiFor secondary cooling water temperature coefficient, Δ T2Represent degree of superheat undulating value.
The utility model patent for introducing the Authorization Notice No. for device such as 2011 on the Augusts mandate in 10, for controlling control system for the U of CN 201922012 will be overheated, molten steel overheat is introduced into control device by the device by continuous temperature measurement, and two cold water distribution quantities are changed according to the degree of superheat.
Although the governing factor that current secondary cooling scheme considers is a lot, these governing factors consider both for cooling water, and control system is introduced there is presently no the influence that control device produces the change of compressed air temperature to secondary cooling.
In actual production, the acute variation of environment temperature can cause fluctuating widely for compressed air temperature so that two cold intensities of cooling are mismatched with produce reality, influence casting blank surface temperature, ultimately result in slab quality and decline or even induce bleed-out.Because compressed air temperature can be measured（Pass through the mounting temperature sensor on compressed-air line）Temperature survey amount participates in secondary cooling scheme as the governing factor of pneumatically operated pressure can effectively eliminate the influence that the acute variation of environment temperature is produced to secondary cooling, stable casting blank surface temperature is finally reached, stable slab quality reduces the purpose of breakout ratio.Therefore exploitation is had great significance based on the cooling control system that two cold compression air themperatures are fed back.
The content of the invention
It is an object of the invention to provide a kind of conticaster secondary cooling control system and its control method, it is intended to eliminate influence of the compressed air temperature fluctuation to casting safety and slab quality caused by environment temperature acute variation, strong technical support is provided for conticaster high yield natural labor.
The purpose of the present invention is realized by the following manner：
The present invention provides a kind of secondary cooling control system of conticaster, including temperature detecting unit, pressure sensing cell, adjustment unit, programmable logic control unit, host computer unit, it is characterized in that pressure sensing cell, temperature detecting unit and adjustment unit are connected with programmable logic control unit by cable respectively, and host computer unit is connected with programmable logic control unit by network.
A kind of control method of the secondary cooling system of conticaster is as follows：It is characterized in that：
Compressed air reference temperature value, reference pressure setting value when temperature adjustment coefficient value and compressed air reference temperature value are set first in host computer unit.
The compressed air reference temperature value that programmable logic control unit is sent according to the temperature value and host computer unit of two cold compression air of collection, reference pressure setting value when temperature adjustment coefficient value and compressed air reference temperature value dynamically adjusts the setting working pressure of two cold compression air
Programmable logic control unit is calculated after the setting working pressure after dynamic adjustment, system is compared according to the actual pressure value of two cold compression air of collection with the setting working pressure after dynamic adjustment, when the deviation of the two exceedes certain limit, programmable logic control unit sends regulated value and controls pneumatic control valve 14 to act into adjustment unit 9, pneumatic control valve 14 by perseveration until the two deviation within the specific limits, the Stress control is substantially PID closed-loop controls；
Final system reaches the influence for eliminating two cold compression air temperature fluctuations to casting blank surface temperature by adjusting the operating pressure of compressed air.
The present invention has advantages below：
Compressed air temperature fluctuation is controlled by the present invention as the eliminable disturbance of one kind, enhances the response speed that secondary cooling is fluctuated to compressed air temperature.
The present invention, which can be run through, to be changed pneumatically operated pressure to compensate the influence that compressed air temperature fluctuation produces casting blank surface temperature, overcomes governing factor in current control method to consider incomplete weak point.
Brief description of the drawings：
Fig. 1 is continuous casting process figure of the invention；
Fig. 2 is system work block diagram of the invention；
Fig. 3 is the control principle drawing of the invention based on two cold compression air themperatures；
Wrapped in the big bags of 1-, 2-, 3- crystallizers, 4- secondary coolings region 5- programmable logic control units, 6- host computer units, 7- temperature detecting units, 8- pressure sensing cells, 9- adjustment units, 10- temperature sensors, 11- Analog input mModules, 12- pressure sensors, 13- Analog input mModules, 14- pneumatic control valves, 15- analog output modules.
Embodiment：
Embodiment 1：
As shown in Figure 1：The present invention provides a kind of secondary cooling control system of conticaster, including temperature detecting unit 7, pressure sensing cell 8, adjustment unit 9, programmable logic control unit 5, host computer unit 6, it is characterized in that pressure sensing cell 8, temperature detecting unit 7 and adjustment unit 9 are connected with programmable logic control unit by cable respectively, and host computer unit is connected with programmable logic control unit by network.
Programmable logic control unit 5 is by Siemens S7-400 CPU, Siemens S7-400 CP modules composition in the present embodiment（Not shown in figure）, and can be communicated with host computer unit 6.
Adjustment unit 9 is made up of Siemens's SM332 analog output modules 15 and pneumatic control valve 14 in the present embodiment, and its effect is that the regulated value for sending programmable logic control unit 5 is converted into electric signal, and pneumatic control valve 14 is acted according to the electric signal.
The pressure set points that programmable logic control unit 5 is sent according to the temperature signal and pressure signal combination host computer unit 6 that collect calculate regulated value and the regulated value are sent into adjustment unit 9, and adjustment unit 9 controls pneumatic control valve 14 to be acted according to regulated value.
The control method is introduced with reference to control principle drawing Fig. 3：
Compressed air reference temperature value, reference pressure setting value when temperature adjustment coefficient value and compressed air reference temperature value are set first in host computer unit.
The compressed air reference temperature value that programmable logic control unit is sent according to the temperature value and host computer unit of two cold compression air of collection, reference pressure setting value when temperature adjustment coefficient value and compressed air reference temperature value dynamically adjusts the setting working pressure of two cold compression air
The Part Methods can be summarized as following mathematic(al) representation：
Psi=△T×k+Psb
△T=Ts-Tp
Wherein i=1,2,3,4 ... .i represent two which cold area,
PsiWorking pressure is set for the compressed air after two cold certain cooling section adjustment,
Ts is compressed air reference temperature value,
Tp is compressed air current temperature value,
△ T are compressed air temperature difference；
K is temperature adjustment coefficient,
PsbReference pressure setting value during for compressed air reference temperature value,
Programmable logic control unit is calculated after the setting working pressure after dynamic adjustment, system is compared according to the actual pressure value of two cold compression air of collection with the setting working pressure after dynamic adjustment, when the deviation of the two exceedes certain limit, programmable logic control unit sends regulated value and controls pneumatic control valve 14 to act into adjustment unit 9, pneumatic control valve 14 by perseveration until the two deviation within the specific limits, the Stress control is substantially PID closed-loop controls.
The Part Methods can be summarized as following mathematic(al) representation：
F=K(KP△P+KI×∫△P.dt + Kd ×dP/dt) -------1
△P= Pi –PP -------2
In expression formula：F represents the opening degree of pneumatic control valve 14, and the value has programmable logic control unit 5 to calculate and be sent in adjustment unit 9, and adjustment unit 9 controls pneumatic control valve 14 to act by analog output module 15 according to the value,
PPFor pneumatically operated pressure measured value, pressure sensing cell 8 detects the value according to pressure sensor, and the value is sent in programmable logic control unit 5,
PiSetting working pressure after being adjusted for dynamic,
K represents PID coefficient, KPRepresent proportionality coefficient, KIRepresent integral coefficient, KdDifferential coefficient is represented, above-mentioned coefficient value is stored in programmable logic control unit 6
Final system reaches the influence for eliminating two cold compression air temperature fluctuations to casting blank surface temperature by adjusting the operating pressure of compressed air.
Claims (2)
1. a kind of secondary cooling control system of conticaster, including temperature detecting unit, pressure sensing cell, adjustment unit, programmable logic control unit, host computer unit, it is characterized in that pressure sensing cell, temperature detecting unit and adjustment unit are connected with programmable logic control unit by cable respectively, and host computer unit is connected with programmable logic control unit by network.
2. a kind of control method of the secondary cooling control system of conticaster is as follows：
Compressed air reference temperature value, reference pressure setting value when temperature adjustment coefficient value and compressed air reference temperature value are set first in host computer unit；
The compressed air reference temperature value that programmable logic control unit is sent according to the temperature value and host computer unit of two cold compression air of collection, reference pressure setting value when temperature adjustment coefficient value and compressed air reference temperature value dynamically adjusts the setting working pressure of two cold compression air；
Programmable logic control unit is calculated after the setting working pressure after dynamic adjustment, system is compared according to the actual pressure value of two cold compression air of collection with the setting working pressure after dynamic adjustment, when the deviation of the two exceedes certain limit, programmable logic control unit sends regulated value and controls pneumatic control valve to act into adjustment unit, pneumatic control valve by perseveration until the two deviation within the specific limits, the Stress control is substantially PID closed-loop controls；
Final system reaches the influence for eliminating two cold compression air temperature fluctuations to casting blank surface temperature by adjusting the operating pressure of compressed air.
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| CN2012105894622A CN103008597A (en) | 2012-12-31 | 2012-12-31 | System and method for automatically controlling second cooling of continuous casting |
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| CN2012105894622A CN103008597A (en) | 2012-12-31 | 2012-12-31 | System and method for automatically controlling second cooling of continuous casting |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105195702A (en) * | 2015-09-30 | 2015-12-30 | 芜湖新兴铸管有限责任公司 | Continuous casting water cooling adjustment technological structure |
| 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 |
| CN111906267A (en) * | 2020-07-28 | 2020-11-10 | 北京科技大学 | Method and system for cooling full gas in continuous casting secondary cooling section |
| CN114130980A (en) * | 2021-10-29 | 2022-03-04 | 中冶南方连铸技术工程有限责任公司 | Continuous casting dynamic secondary cooling control method |
| US11363910B2 (en) | 2017-08-09 | 2022-06-21 | Sharkninja Operating Llc | Cooking device and components thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105195702A (en) * | 2015-09-30 | 2015-12-30 | 芜湖新兴铸管有限责任公司 | Continuous casting water cooling adjustment technological structure |
| 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 |
| US11363910B2 (en) | 2017-08-09 | 2022-06-21 | Sharkninja Operating Llc | Cooking device and components thereof |
| CN111906267A (en) * | 2020-07-28 | 2020-11-10 | 北京科技大学 | Method and system for cooling full gas in continuous casting secondary cooling section |
| CN114130980A (en) * | 2021-10-29 | 2022-03-04 | 中冶南方连铸技术工程有限责任公司 | Continuous casting dynamic secondary cooling control method |
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Application publication date: 20130403 |