CN103611734A - Laminar cooling temperature control method and system - Google Patents
Laminar cooling temperature control method and system Download PDFInfo
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- CN103611734A CN103611734A CN201310600841.1A CN201310600841A CN103611734A CN 103611734 A CN103611734 A CN 103611734A CN 201310600841 A CN201310600841 A CN 201310600841A CN 103611734 A CN103611734 A CN 103611734A
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Abstract
The invention discloses a laminar cooling temperature control method. The method includes: using temperatures of starts and ends of a roughly-cooled segment and a finely-cooled segment of a steel plate as constraint conditions, determining steel plate operation standard speed, the amount of roughly-cooled segment standard valves, and the amount of finely-cooled segment standard valves, meeting the constraint conditions; acquiring actual operation speed of the steel plate, comparing the actual operation speed to steel plate operation standard speed, and adjusting the amounts of roughly-cooled segment and finely-cooled segment valves according to comparison results; acquiring actual initial temperature of the start of the roughly-cooled segment, comparing the actual initial temperature to steel plate initial temperature, and adjusting the amounts of the roughly-cooled segment and finely-cooled segment valves according to comparison results, measuring actual steel plate final temperature of the end of the finely-cooled segment, comparing the actual steel plate final temperature to target final temperature, and adjusting the amounts of the roughly-cooled segment and finely-cooled segment valves according to comparison results. The invention further provides a system that implements the method. The method and the system have the advantages that steel plate cooling can be controlled in real time, intermediate temperature control and cooling rate control are achieved, and the guidance for the laminar cooling process is of good value.
Description
Technical field
The invention belongs to steel and iron industry control technology field, be specifically related to a kind of laminar flow chilling temperature control method and system.
Background technology
Steel and iron industry is to support the mainstay industry of the national economic development, and modern steel industrial expansion level is the important embodiment of a national technological progress and overall national strength.For hot-strip, its performance not only depends on hot rolling technology, is more decided by rolling control cooling technology afterwards.Within can hot coiling temperature be controlled at claimed range, depend primarily on the control to hot strip steel cooling system after finishing mill.
Conventionally coiling temperature changes with steel grade, even identical steel grade, if the content of the trace element such as carbon is different, coiling temperature also has different requirements.The coiling temperature of most steel grades, below 670 ℃, is about 570 ℃～650 ℃.Conventionally, hot strip steel is about 800 ℃～900 ℃ from mm finishing mill unit finishing temperature out, and the runout table of most hot-rolled steel production line is all at tens to more than 100 meters, and be generally between several seconds to tens seconds the running time with steel on this section of roller-way.Within the so short time, to make belt steel temperature reduce by 200 ℃～350 ℃, it is impossible only depending on steel naturally cooling on runout table, the cooling water injector of high efficiency must be set on runout table, to band steel upper and lower surface water spray, force cooling, and injection flow rate is accurately controlled, to meet the control requirement of coiling temperature.
The first, affect the many factors of TEMPERATURE FOR HOT STRIP LAMINAR chilling temperature, the main size of steel plate is, the temperature of the impact velocity of current, cooling water, and the first cold temperature of steel plate and speed of service etc.; The second, measure high-temperature steel plate surface temperature and internal temperature all very difficult; The 3rd, the precision of the temperature model of each section is limited, does not reach the requirement of real-time control; The 4th, the conventional means that is used for controlling the curling temperature of steel plate comprises the water yield and the hydraulic pressure spraying with between steel operation acceleration and frame, and they have very large hysteresis to the impact of the curling temperature of steel plate, have therefore further improved the difficulty of controlling realization of goal.
Domestic research adopts the open-loop control method based on temperature model substantially, and it is controlled design and based on cooling jig, realizes completely, and control accuracy largely depends on the precision of cooling jig.Based on Solid boundary condition, constraint completes with on-the-spot magnanimity creation data in the foundation of cooling jig.The cooling jig that foreign scholar and technical staff's research obtain under various constraints, thus steel mill is unsatisfactory owing to being difficult to meet these constraints scope practical application effects at home.In addition, temperature model is poor for emerging operating mode adaptive capacity and Ability of Resisting Disturbance, and therefore the open-loop control system based on temperature model is difficult to meet high-precision Strip Steel Coiling Temperature control requirement.
Limitation based on static open-loop control system, foreign scholar has introduced again Dynamic Closed Loop Control system in succession, and it has higher control accuracy to promote.American I NDIANA port 2134mm torrid zone steel mill has introduced this control system, this system has adopted feedforward, feedback and adaptive combined control mode, take temperature prediction model as basis, adopt the fluctuation of FEEDFORWARD CONTROL compensation boundary condition, FEEDBACK CONTROL reduces the deviation of actual coiling temperature and target coiling temperature, and the key parameter of temperature prediction model is revised in Self Adaptive Control automatically.By introducing Dynamic Closed Loop Control system, the more static open loop of the cooling coiling temperature CT of TEMPERATURE FOR HOT STRIP LAMINAR hit rate is controlled and is improved a lot.
In addition Chinese scholars is introduced the cold field of belt steel rolling control by intellectual technology, and this makes to be with steel control refrigeration technique to burst out new vitality.The method that document " Chai T Y; Wang X B.Application of RBF neural networks in control system of the slab accelerating cooling process.Acta Automatica Sinica; 2000,26 (2): 219-225 " adopts RBF neutral net to combine with Optimized-control Technique.First set up the RBF network model of belt steel temperature and each input variable, then use the correction of every act of flow of this model reverse, by the study of object inversion model, obtain the controller of controlled device.But the method is difficult to describe cooling procedure physical characteristic, is difficult to adaptation condition and changes situation greatly.
Document " the hot strip cooling process on the runout table modeling and control research based on reasoning by cases: [doctorate paper]. Shenyang: Northeastern University; 2005 " utilize expertise to set up the expert control system based on case library, adopting expert reasoning to open number to cooling zone collector presets, mode input, for working conditions such as band steel hardness level, thickness, finish to gauge outlet temperature, band steel head speed and coolant water temperatures, is output as and opens collector sum setting value.The method of using Case Retrieval, reusing, revise and store for input case characteristic, the collector that finally obtains matching is with it opened sum setting value, but the foundation of database needs the data of magnanimity, need to constantly be optimized, and the retrieval of experts database, reuse, makeover process needs for a long time, slow being not easy to of response speed operates in real time.
Summary of the invention
The present invention is directed to the deficiency of existing control method, the invention discloses a kind of control method and system of laminar flow chilling temperature, in the cooling procedure of steel plate, based on speed, compensate the quantity of continuous correction valve; Temperature deviation is carried out to segmentation utilization, can have inhibitory action to the fluctuation of laminar cooling process medium velocity, inlet temperature, also for the effect of the cooling final cooling temperature of laminar flow, feed back and guarantee that follow-up steel plate can access reasonably cooling.The present invention can realize the real-time control of steel plate, can adopt for the steel plate of different-thickness the different speeds of service, and can realize the control of medium temperature and the control of cooldown rate.
A TEMPERATURE FOR HOT STRIP LAMINAR chilling temperature control method, comprises the following steps:
The essential information determining step of cooling front spring:
Gather steel plate thickness h, steel plate initial temperature T
0; Set the target final cooling temperature T of steel plate; The cooling production line length of steel plate laminar flow is divided into thick cold section and fine cold-leg, sets the corresponding initial temperature T of initial sum final position difference of thick cold section
0with target medium temperature T
m, the initial sum final position of fine cold-leg is corresponding target medium temperature T respectively
mwith target final cooling temperature T;
Cooling front cooling control criterion parameter initialization step:
The starting and ending place corresponding temperature of the steel plate of usining thick cold section and fine cold-leg, as constraints, is determined the cooling control criterion parameter that meets this constraints, and described control criterion parameter comprises steel plate operation standard speed v
0, thick cold segment standard valve quantity N
cand fine cold-leg standard valve quantity N
j;
Valve quantity correction step based on velocity compensation in cooling:
The actual motion speed v of Real-time Collection steel plate, by actual motion speed v and steel plate operation standard speed v
0compare, according to this comparative result adjustment thick cold section and fine cold-leg valve quantity;
The valve quantity correction step of controlling based on temperature feed-forward in cooling:
Gather the actual initial temperature T ' of the cooling thick cold section of section start of laminar flow
0, by actual initial temperature T '
0with steel plate initial temperature T
0compare, according to this comparative result adjustment thick cold section and fine cold-leg valve quantity;
The valve quantity correction step of controlling based on temperature feedback in cooling:
Measure in real time the actual steel plate final cooling temperature T ' of the cooling fine cold-leg of laminar flow end, itself and target final cooling temperature T are compared, according to this comparative result adjustment thick cold section and fine cold-leg valve quantity.
Further, described cooling in valve quantity correction step based on velocity compensation be specially:
The actual motion speed v of Real-time Collection steel plate, calculates actual motion speed v and steel plate operation standard speed v
0ratio;
According to the thick cold section of valve number change of this ratio calculation
adjust thick cold section of valve quantity N
c=N
c+ Δ N
cv;
According to this ratio calculation fine cold-leg valve number change
adjust fine cold-leg valve quantity N
j=N
j+ Δ N
jv; Wherein, 0 < c, j < 1, the span that the cooling production-line technique of steel plate laminar flow is adjusted coefficient A is [0,1].
Further, the described valve quantity correction step of controlling based on temperature feed-forward in cooling is specially:
Gather the actual initial temperature T ' of the cooling thick cold section of section start of laminar flow
0, calculate actual initial temperature T '
0with steel plate initial temperature T
0between difference, according to this difference, calculate thick cold section of valve number change Δ N
cp=(T
0'-T
0)/c
x, c
xexpression Current Temperatures is T '
0steel plate by single valve chilling temperature variable quantity in thick cold section; Adjust thick cold section of valve quantity N
c=N
c+ Δ N
cp;
Gather the actual medium temperature T ' of the cooling Cu Lengduan of laminar flow end
m, calculate actual medium temperature T '
mwith steel plate medium temperature T
mdifference, according to this difference, adjust fine cold-leg valve quantity Δ N
jp=(T
m'-T
m)/c
y, c
yexpression Current Temperatures is T '
msteel plate in fine cold-leg by the cooled temperature variation of single valve.
Further, the described valve quantity correction step of controlling based on temperature feedback in cooling is specially:
Measure in real time the actual steel plate final cooling temperature T ' of the cooling fine cold-leg of laminar flow end, calculate the difference of actual steel plate final cooling temperature T ' and target final cooling temperature T; According to the thick cold section of valve number change Δ N of the thick cold section of valve quantity of this interpolation calculation
cf=(T'-T)/(c
xf
1), thick cold section of feedback correcting coefficient f
1span be [0,1], c
xexpression Current Temperatures is T '
0steel plate by the cooled temperature variation of single valve in thick cold section; Calculate fine cold-leg valve number change Δ N
jf=(T'-T)/(c
yf
2), thick cold section of feedback correcting coefficient f
2span be [0,1], c
yexpression Current Temperatures is T '
0steel plate by the cooled temperature variation of single valve in fine cold-leg.
Further, described cooling front cooling control criterion parameter initialization step is specially:
Steel plate operation standard speed v
0really stator step: by sample steel plate is carried out to Measurement and analysis, obtain the mapping table of steel plate cooldown rate and steel plate movement rate and thickness product, more just can obtain by look-up table steel plate movement velocity and the thickness product n that target cooldown rate a is corresponding
v, and then calculate the steel plate operation standard speed v that thickness is h under target cooldown rate a
0=n
v/ h;
Thick cold segment standard valve quantity is stator step really: determine thick cold segment standard valve quantity N
c=(Δ T-T
h)/X, Δ T=T
0-T, X is the steel billet temperature change mean that in thick cold section, single valve causes;
Fine cold-leg standard valve quantity is stator step really: thick cold segment standard valve quantity N
j=T
h/ Y, Y is the steel billet temperature change mean that in fine cold-leg, single valve causes.
A TEMPERATURE FOR HOT STRIP LAMINAR chilling temperature control system, comprises
The essential information determination module of cooling front spring, for gathering steel plate thickness h, steel plate initial temperature T
0; Set the target final cooling temperature T of steel plate; The cooling production line length of steel plate laminar flow is divided into thick cold section and fine cold-leg, sets the corresponding initial temperature T of initial sum final position difference of thick cold section
0with target medium temperature T
m, the initial sum final position of fine cold-leg is corresponding target medium temperature T respectively
mwith target final cooling temperature T;
Cooling front cooling control criterion parameter initialization module, for usining the starting and ending place corresponding temperature of steel plate thick cold section and fine cold-leg as constraints, determine the cooling control criterion parameter that meets this constraints, described control criterion parameter comprises steel plate operation standard speed v
0, thick cold segment standard valve quantity N
cand fine cold-leg standard valve quantity N
j;
Valve quantity correcting module based on velocity compensation in cooling, for the actual motion speed v of Real-time Collection steel plate, by actual motion speed v and steel plate operation standard speed v
0compare, according to this comparative result adjustment thick cold section and fine cold-leg valve quantity;
The valve quantity correcting module of controlling based on temperature feed-forward in cooling, for gathering the actual initial temperature T ' of the cooling thick cold section of section start of laminar flow
0, by actual initial temperature T '
0with steel plate initial temperature T
0compare, according to this comparative result adjustment thick cold section and fine cold-leg valve quantity;
The valve quantity correcting module of controlling based on temperature feedback in cooling, for measuring in real time the actual steel plate final cooling temperature T ' of the cooling fine cold-leg of laminar flow end, itself and target final cooling temperature T are compared, according to this comparative result adjustment thick cold section and fine cold-leg valve quantity.
Further, described cooling in valve quantity correcting module based on velocity compensation comprise
Ratio calculation submodule, for the actual motion speed v of Real-time Collection steel plate, calculates actual motion speed v and steel plate operation standard speed v
0ratio;
The first thick cold section of valve quantity is adjusted submodule, for according to the thick cold section of valve number change of this ratio calculation
adjust thick cold section of valve quantity N
c=N
c+ Δ N
cv;
The first fine cold-leg valve quantity is adjusted submodule, for according to this ratio calculation fine cold-leg valve number change
adjust fine cold-leg valve quantity N
j=N
j+ Δ N
jv; Wherein, 0 < c, j < 1, the span that the cooling production-line technique of steel plate laminar flow is adjusted coefficient A is [0,1].
Further, the described valve quantity correcting module of controlling based on temperature feed-forward in cooling comprises
The second thick cold section of valve quantity is adjusted submodule, for gathering the actual initial temperature T ' of the cooling thick cold section of section start of laminar flow
0, calculate actual initial temperature T '
0with steel plate initial temperature T
0between difference, according to this difference, calculate thick cold section of valve number change Δ N
cp=(T
0'-T
0)/c
x, c
xexpression Current Temperatures is T '
0steel plate by single valve chilling temperature variable quantity in thick cold section; Adjust thick cold section of valve quantity N
c=N
c+ Δ N
cp;
The second fine cold-leg valve quantity is adjusted submodule, for gathering the actual medium temperature T ' of the cooling Cu Lengduan of laminar flow end
m, calculate actual medium temperature T '
mwith steel plate medium temperature T
mdifference, according to this difference, adjust fine cold-leg valve quantity Δ N
jp=(T
m'-T
m)/c
y, c
yexpression Current Temperatures is T '
msteel plate in fine cold-leg by the cooled temperature variation of single valve.
Further, the described valve quantity correcting module of controlling based on temperature feedback in cooling comprises:
Difference calculating module, for measuring in real time the actual steel plate final cooling temperature T ' of the cooling fine cold-leg of laminar flow end, calculates the difference of actual steel plate final cooling temperature T ' and target final cooling temperature T;
The 3rd thick cold section of valve quantity is adjusted submodule, for calculating the thick cold section of valve number change Δ N of thick cold section of valve quantity
cf=(T'-T)/(c
xf
1), thick cold section of feedback correcting coefficient f
1span be [0,1], c
xexpression Current Temperatures is T '
0steel plate by the cooled temperature variation of single valve in thick cold section;
The 3rd fine cold-leg valve quantity is adjusted submodule, for calculating fine cold-leg valve number change Δ N
jf=(T'-T)/(c
yf
2), thick cold section of feedback correcting coefficient f
2span be [0,1], c
yexpression Current Temperatures is T '
0steel plate by the cooled temperature variation of single valve in fine cold-leg.
Further, described cooling front cooling control criterion parameter initialization module comprises:
Steel plate operation standard speed v
0really stator modules, for by sample steel plate is carried out to Measurement and analysis, obtains the mapping table of steel plate cooldown rate and steel plate movement rate and thickness product, more just can obtain by look-up table steel plate movement velocity and the thickness product n that target cooldown rate a is corresponding
v, and then calculate the steel plate operation standard speed v that thickness is h under target cooldown rate a
0=n
v/ h;
Thick cold segment standard valve quantity is stator modules really, for determining thick cold segment standard valve quantity N
c=(Δ T-T
h)/X, Δ T=T
0-T, X is the steel billet temperature change mean that in thick cold section, single valve causes;
Fine cold-leg standard valve quantity is stator modules really, for determining thick cold segment standard valve quantity N
j=T
h/ Y, Y is the steel billet temperature change mean that in fine cold-leg, single valve causes.Technique effect of the present invention is embodied in:
The present invention can carry out for the steel plate of different-thickness the control of final cooling temperature and cooldown rate; The fluctuation of speed and initial temperature is had to real-time control effect, can be by error concealment; Deviation when laminar cooling process is finished has within FEEDBACK CONTROL effect can control to suitable scope by the temperature of follow-up steel plate; Can realize the control of the medium temperature after the cooling thick cold junction bundle of laminar flow.This method is usingd steel plate speed and two sections of valves as control subject, realizes the cooling real-time control of steel plate, and the cooling production process of laminar flow is had to good guiding value.
Accompanying drawing explanation
Fig. 1 is control mode schematic diagram of the present invention;
Fig. 2 is control method flow chart of the present invention.
The specific embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.In addition,, in each embodiment of described the present invention, involved technical characterictic just can not combine mutually as long as do not form each other conflict.
Referring to Fig. 1, the inventive method detailed process is:
(1) the essential information determining step of steel plate
Gather steel plate thickness h, steel plate initial temperature T
0; Set the target final cooling temperature T of steel plate; The cooling production line length of steel plate laminar flow is divided into thick cold section and fine cold-leg, sets the corresponding initial temperature T of initial sum final position difference of thick cold section
0with target medium temperature T
m, the initial sum final position of fine cold-leg is corresponding target medium temperature T respectively
mwith target final cooling temperature T.
T
mlaminar flow process is divided into two sections, and in thick cold section, injection flow rate is larger, and temperature is significantly reduced near default final cooling temperature; In fine cold-leg, injection flow rate is less, can more accurately the temperature of steel plate be adjusted to default final cooling temperature.T
mto choose be mainly to leave the surplus of thick cold section, be unlikely to make thick cold section of temperature after cooling lower than T
m, for example choose the single valve chilling temperature of general selection fine cold-leg amount 7 times, T
m=7c
y.
(2) cooling control criterion parameter initialization step:
The starting and ending place design temperature of the steel plate of usining thick cold section and fine cold-leg, as constraints, is determined the cooling control criterion parameter that meets this constraints, comprises steel plate operation standard speed v
0, thick cold segment standard valve quantity N
cand fine cold-leg standard valve quantity N
j.
(a) steel plate operation standard speed v
0
Steel plate cooldown rate is both relevant with steel plate movement rate, relevant with the thickness of steel plate own again.If direct basis steel plate cooldown rate is calculated steel plate movement rate, there is the problem that computation complexity is large and accuracy is low.Therefore the present invention is by a kind of indirectly mode, owing to there is certain relation in steel plate cooldown rate and steel plate movement rate and steel plate thickness product, can be by sample steel plate being measured and to historical data analysis, obtain the corresponding relation of steel plate cooldown rate and steel plate movement rate and thickness product, more just can obtain by look-up table steel plate movement velocity and the thickness product n that target cooldown rate a is corresponding
v, and then calculate the steel plate operation standard speed v that thickness is h under target cooldown rate a
0=n
v/ h.
(b) thick cold segment standard valve quantity
According to T
0carry out the calculating of valve with the difference DELTA T of T, principle that can linear superposition to the cooling effect of steel plate according to single valve, the valve quantity that the temperature drop of calculating Δ T need to be opened, the temperature drop average that each valve causes is that the concrete numerical value of X(is measured by testing with historical data), corresponding thick cold segment standard valve quantity: N
c=(Δ T-T
h)/X;
(c) fine cold-leg standard valve quantity
For fine cold-leg, measuring equally the temperature drop average that each valve is corresponding is Y, corresponding fine cold-leg standard valve quantity: N
j=T
h/ Y.
(3) the valve quantity correction step based on velocity compensation:
The speed of moving due to steel plate is constantly to change, and directly affects the cooling effect of steel plate, therefore proposes velocity compensation so that valve quantity is revised.This step adopts speed of service compensating control method, and the speed of service of Real-time Collection steel plate utilizes speed compensation control method to revise in real time with fine cold-leg valve quantity thick cold section of steel plate.
Detailed process is: the actual motion speed v of Real-time Collection steel plate, calculate actual motion speed v and steel plate operation standard speed v
0ratio; According to the thick cold section of valve number change of this ratio calculation
adjust thick cold section of valve quantity N
c=N
c+ Δ N
cv; According to this ratio calculation fine cold-leg valve number change
adjust fine cold-leg valve quantity N
j=N
j+ Δ N
jv; Wherein, 0 < c, j < 1, the span that the cooling production-line technique of steel plate laminar flow is adjusted coefficient A is [0,1].
(4) the valve quantity correction step of controlling based on temperature feed-forward:
Measure the actual initial temperature of the cooling thick cold section of section start of laminar flow, by itself and target medium temperature T
mrelatively, utilize deviation to carry out FEEDFORWARD CONTROL to thick cold section with the valve quantity of fine cold-leg.
Gather the actual initial temperature T ' of the cooling thick cold section of section start of laminar flow
0, calculate actual initial temperature T '
0with steel plate initial temperature T
0between difference, according to this difference, calculate thick cold section of valve number change Δ N
cp=(T
0'-T
0)/c
x, c
xexpression Current Temperatures is T '
0steel plate by single valve chilling temperature variable quantity in thick cold section; Adjust thick cold section of valve quantity N
c=N
c+ Δ N
cp;
Gather the actual medium temperature T ' of the cooling Cu Lengduan of laminar flow end
m, calculate actual medium temperature T '
mwith steel plate medium temperature T
mdifference, according to this difference, adjust fine cold-leg valve quantity Δ N
jp=(T
m'-T
m)/c
y, c
yexpression Current Temperatures is T '
msteel plate in fine cold-leg by the cooled temperature variation of single valve.
Δ N
cpeffect be t time delay
1=L
c/ v
0, L
cfor thick cold segment length; Δ N
jpeffect be t time delay
1=L
j/ v
0, L
jfor thick cold segment length.
(5) the valve quantity correction step of controlling based on temperature feedback:
Gather the actual final cooling temperature of the cooling end of laminar flow, it is compared with target chilling temperature, utilize deviation to revise in real time with the valve quantity of fine cold-leg thick cold section.
Measure in real time the actual steel plate final cooling temperature T ' of the cooling fine cold-leg of laminar flow end, calculate the difference of actual steel plate final cooling temperature T ' and target final cooling temperature T; According to the thick cold section of valve number change Δ N of the thick cold section of valve quantity of this interpolation calculation
cf=(T'-T)/(c
xf
1), thick cold section of feedback correcting coefficient f
1span be [0,1]; Calculate fine cold-leg valve number change Δ N
jf=(T'-T)/(c
yf
2), thick cold section of feedback correcting coefficient f
2span be [0,1].
Above step (3) is constantly carried out to (5), until all steel plates are cooling complete.
Fig. 2 is control procedure flow chart, and as shown in the figure, the main body of control is valve quantity and the steel plate speed of service.The steel plate speed of service is by the product n of speed and thickness
vdetermine with the relation of cooldown rate; The quantity of valve is comprised of four parts: the valve quantity of standard valve quantity, the valve quantity of feedforward impact, the valve quantity of feedback influence, velocity compensation impact.As shown in Figure 2, the valve quantity sum of four parts is exactly the quantity of real-time valve to idiographic flow, and wherein standard valve quantity is definite value, and other three is the variable relevant to real-time parameter.
By said method, can carry out for the steel plate of different-thickness the control of final cooling temperature and cooldown rate; The fluctuation of speed and initial temperature is had to real-time control effect, can be by error concealment; Deviation when laminar cooling process is finished has within FEEDBACK CONTROL effect can control to suitable scope by the temperature of follow-up steel plate; Can realize the control of the medium temperature after the cooling thick cold junction bundle of laminar flow.This method is usingd steel plate speed and two sections of valves as control subject, realizes the cooling real-time control of steel plate.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a TEMPERATURE FOR HOT STRIP LAMINAR chilling temperature control method, is characterized in that, comprises the following steps:
The essential information determining step of cooling front spring:
Gather steel plate thickness h, steel plate initial temperature T
0; Set the target final cooling temperature T of steel plate; The cooling production line length of steel plate laminar flow is divided into thick cold section and fine cold-leg, sets the corresponding initial temperature T of initial sum final position difference of thick cold section
0with target medium temperature T
m, the initial sum final position of fine cold-leg is corresponding target medium temperature T respectively
mwith target final cooling temperature T;
Cooling front cooling control criterion parameter initialization step:
The starting and ending place corresponding temperature of the steel plate of usining thick cold section and fine cold-leg, as constraints, is determined the cooling control criterion parameter that meets this constraints, and described control criterion parameter comprises steel plate operation standard speed v
0, thick cold segment standard valve quantity N
cand fine cold-leg standard valve quantity N
j;
Valve quantity correction step based on velocity compensation in cooling:
The actual motion speed v of Real-time Collection steel plate, by actual motion speed v and steel plate operation standard speed v
0compare, according to this comparative result adjustment thick cold section and fine cold-leg valve quantity;
The valve quantity correction step of controlling based on temperature feed-forward in cooling:
Gather the actual initial temperature T ' of the cooling thick cold section of section start of laminar flow
0, by actual initial temperature T '
0with steel plate initial temperature T
0compare, according to this comparative result adjustment thick cold section and fine cold-leg valve quantity;
The valve quantity correction step of controlling based on temperature feedback in cooling:
Measure in real time the actual steel plate final cooling temperature T ' of the cooling fine cold-leg of laminar flow end, itself and target final cooling temperature T are compared, according to this comparative result adjustment thick cold section and fine cold-leg valve quantity.
2. TEMPERATURE FOR HOT STRIP LAMINAR chilling temperature control method according to claim 1, is characterized in that, described cooling in valve quantity correction step based on velocity compensation be specially:
The actual motion speed v of Real-time Collection steel plate, calculates actual motion speed v and steel plate operation standard speed v
0ratio;
According to the thick cold section of valve number change of this ratio calculation
adjust thick cold section of valve quantity N
c=N
c+ Δ N
cv;
According to this ratio calculation fine cold-leg valve number change
adjust fine cold-leg valve quantity N
j=N
j+ Δ N
jv; Wherein, 0 < c, j < 1, the span that the cooling production-line technique of steel plate laminar flow is adjusted coefficient A is [0,1].
3. TEMPERATURE FOR HOT STRIP LAMINAR chilling temperature control method according to claim 1 and 2, is characterized in that, the described valve quantity correction step of controlling based on temperature feed-forward in cooling is specially:
Gather the actual initial temperature T ' of the cooling thick cold section of section start of laminar flow
0, calculate actual initial temperature T '
0with steel plate initial temperature T
0between difference, according to this difference, calculate thick cold section of valve number change Δ N
cp=(T
0'-T
0)/c
x, c
xexpression Current Temperatures is T '
0steel plate by single valve chilling temperature variable quantity in thick cold section; Adjust thick cold section of valve quantity N
c=N
c+ Δ N
cp;
Gather the actual medium temperature T ' of the cooling Cu Lengduan of laminar flow end
m, calculate actual medium temperature T '
mwith steel plate medium temperature T
mdifference, according to this difference, adjust fine cold-leg valve quantity Δ N
jp=(T
m'-T
m)/c
y, c
yexpression Current Temperatures is T '
msteel plate in fine cold-leg by the cooled temperature variation of single valve.
4. according to the TEMPERATURE FOR HOT STRIP LAMINAR chilling temperature control method described in claim 1 or 2 or 3, it is characterized in that, the described valve quantity correction step of controlling based on temperature feedback in cooling is specially:
Measure in real time the actual steel plate final cooling temperature T ' of the cooling fine cold-leg of laminar flow end, calculate the difference of actual steel plate final cooling temperature T ' and target final cooling temperature T; According to the thick cold section of valve number change Δ N of the thick cold section of valve quantity of this interpolation calculation
cf=(T'-T)/(c
xf
1), thick cold section of feedback correcting coefficient f
1span be [0,1], c
xexpression Current Temperatures is T '
0steel plate by the cooled temperature variation of single valve in thick cold section; Calculate fine cold-leg valve number change Δ N
jf=(T'-T)/(c
yf
2), thick cold section of feedback correcting coefficient f
2span be [0,1], c
yexpression Current Temperatures is T '
0steel plate by the cooled temperature variation of single valve in fine cold-leg.
5. according to the TEMPERATURE FOR HOT STRIP LAMINAR chilling temperature control method described in claim 1 or 2 or 3, it is characterized in that, described cooling front cooling control criterion parameter initialization step is specially:
Steel plate operation standard speed v
0really stator step: by sample steel plate is carried out to Measurement and analysis, obtain the mapping table of steel plate cooldown rate and steel plate movement rate and thickness product, more just can obtain by look-up table steel plate movement velocity and the thickness product n that target cooldown rate a is corresponding
v, and then calculate the steel plate operation standard speed v that thickness is h under target cooldown rate a
0=n
v/ h;
Thick cold segment standard valve quantity is stator step really: determine thick cold segment standard valve quantity N
c=(Δ T-T
h)/X, Δ T=T
0-T, X is the steel billet temperature change mean that in thick cold section, single valve causes;
Fine cold-leg standard valve quantity is stator step really: thick cold segment standard valve quantity N
j=T
h/ Y, Y is the steel billet temperature change mean that in fine cold-leg, single valve causes.
6. a TEMPERATURE FOR HOT STRIP LAMINAR chilling temperature control system, is characterized in that, comprises
The essential information determination module of cooling front spring, for gathering steel plate thickness h, steel plate initial temperature T
0; Set the target final cooling temperature T of steel plate; The cooling production line length of steel plate laminar flow is divided into thick cold section and fine cold-leg, sets the corresponding initial temperature T of initial sum final position difference of thick cold section
0with target medium temperature T
m, the initial sum final position of fine cold-leg is corresponding target medium temperature T respectively
mwith target final cooling temperature T;
Cooling front cooling control criterion parameter initialization module, for usining the starting and ending place corresponding temperature of steel plate thick cold section and fine cold-leg as constraints, determine the cooling control criterion parameter that meets this constraints, described control criterion parameter comprises steel plate operation standard speed v
0, thick cold segment standard valve quantity N
cand fine cold-leg standard valve quantity N
j;
Valve quantity correcting module based on velocity compensation in cooling, for the actual motion speed v of Real-time Collection steel plate, by actual motion speed v and steel plate operation standard speed v
0compare, according to this comparative result adjustment thick cold section and fine cold-leg valve quantity;
The valve quantity correcting module of controlling based on temperature feed-forward in cooling, for gathering the actual initial temperature T ' of the cooling thick cold section of section start of laminar flow
0, by actual initial temperature T '
0with steel plate initial temperature T
0compare, according to this comparative result adjustment thick cold section and fine cold-leg valve quantity;
The valve quantity correcting module of controlling based on temperature feedback in cooling, for measuring in real time the actual steel plate final cooling temperature T ' of the cooling fine cold-leg of laminar flow end, itself and target final cooling temperature T are compared, according to this comparative result adjustment thick cold section and fine cold-leg valve quantity.
7. TEMPERATURE FOR HOT STRIP LAMINAR chilling temperature control system according to claim 6, is characterized in that, described cooling in valve quantity correcting module based on velocity compensation comprise
Ratio calculation submodule, for the actual motion speed v of Real-time Collection steel plate, calculates actual motion speed v and steel plate operation standard speed v
0ratio;
The first thick cold section of valve quantity is adjusted submodule, for according to the thick cold section of valve number change of this ratio calculation
adjust thick cold section of valve quantity N
c=N
c+ Δ N
cv;
The first fine cold-leg valve quantity is adjusted submodule, for according to this ratio calculation fine cold-leg valve number change
adjust fine cold-leg valve quantity N
j=N
j+ Δ N
jv; Wherein, 0 < c, j < 1, the span that the cooling production-line technique of steel plate laminar flow is adjusted coefficient A is [0,1].
8. TEMPERATURE FOR HOT STRIP LAMINAR chilling temperature control system according to claim 6, is characterized in that, the described valve quantity correcting module of controlling based on temperature feed-forward in cooling comprises
The second thick cold section of valve quantity is adjusted submodule, for gathering the actual initial temperature T ' of the cooling thick cold section of section start of laminar flow
0, calculate actual initial temperature T '
0with steel plate initial temperature T
0between difference, according to this difference, calculate thick cold section of valve number change Δ N
cp=(T
0'-T
0)/c
x, c
xexpression Current Temperatures is T '
0steel plate by single valve chilling temperature variable quantity in thick cold section; Adjust thick cold section of valve quantity N
c=N
c+ Δ N
cp;
The second fine cold-leg valve quantity is adjusted submodule, for gathering the actual medium temperature T ' of the cooling Cu Lengduan of laminar flow end
m, calculate actual medium temperature T '
mwith steel plate medium temperature T
mdifference, according to this difference, adjust fine cold-leg valve quantity Δ N
jp=(T
m'-T
m)/c
y, c
yexpression Current Temperatures is T '
msteel plate in fine cold-leg by the cooled temperature variation of single valve.
9. TEMPERATURE FOR HOT STRIP LAMINAR chilling temperature control system according to claim 6, is characterized in that, the described valve quantity correcting module of controlling based on temperature feedback in cooling comprises:
Difference calculating module, for measuring in real time the actual steel plate final cooling temperature T ' of the cooling fine cold-leg of laminar flow end, calculates the difference of actual steel plate final cooling temperature T ' and target final cooling temperature T;
The 3rd thick cold section of valve quantity is adjusted submodule, for calculating the thick cold section of valve number change Δ N of thick cold section of valve quantity
cf=(T'-T)/(c
xf
1), thick cold section of feedback correcting coefficient f
1span be [0,1], c
xexpression Current Temperatures is T '
0steel plate by the cooled temperature variation of single valve in thick cold section;
The 3rd fine cold-leg valve quantity is adjusted submodule, for calculating fine cold-leg valve number change Δ N
jf=(T'-T)/(c
yf
2), thick cold section of feedback correcting coefficient f
2span be [0,1], c
yexpression Current Temperatures is T '
0steel plate by the cooled temperature variation of single valve in fine cold-leg.
10. according to the TEMPERATURE FOR HOT STRIP LAMINAR chilling temperature control system described in claim 6 or 7 or 8 or 9, it is characterized in that, described cooling front cooling control criterion parameter initialization module comprises:
Steel plate operation standard speed v
0really stator modules, for by sample steel plate is carried out to Measurement and analysis, obtains the mapping table of steel plate cooldown rate and steel plate movement rate and thickness product, more just can obtain by look-up table steel plate movement velocity and the thickness product n that target cooldown rate a is corresponding
v, and then calculate the steel plate operation standard speed v that thickness is h under target cooldown rate a
0=n
v/ h;
Thick cold segment standard valve quantity is stator modules really, for determining thick cold segment standard valve quantity N
c=(Δ T-T
h)/X, Δ T=T
0-T, X is the steel billet temperature change mean that in thick cold section, single valve causes;
Fine cold-leg standard valve quantity is stator modules really, for determining thick cold segment standard valve quantity N
j=T
h/ Y, Y is the steel billet temperature change mean that in fine cold-leg, single valve causes.
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| CN103878186A (en) * | 2014-03-24 | 2014-06-25 | 华中科技大学 | Method for determining hot rolled strip steel laminar cooling temperature |
| CN104226699A (en) * | 2014-08-21 | 2014-12-24 | 南京钢铁股份有限公司 | Closed-loop control method for positive and negative feedback of laminar cooling |
| CN105234191A (en) * | 2015-10-30 | 2016-01-13 | 华中科技大学 | Laminar cooling temperature control method |
| CN105537281A (en) * | 2015-12-07 | 2016-05-04 | 北京首钢股份有限公司 | Method for improving coiling temperature control accuracy under laminar cooling model |
| CN106862283A (en) * | 2017-02-10 | 2017-06-20 | 武汉钢铁工程技术集团自动化有限责任公司 | The ultrafast cold Process Control System of hot rolling |
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| CN110262582A (en) * | 2019-07-30 | 2019-09-20 | 中原工学院 | A kind of barotor temprature control method based on improvement RBF neural |
| 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 |
| CN114386689A (en) * | 2022-01-07 | 2022-04-22 | 青岛特殊钢铁有限公司 | High-speed wire tensile strength online real-time prediction method with self-learning function |
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| CN114570775A (en) * | 2020-11-30 | 2022-06-03 | 宝山钢铁股份有限公司 | Automatic control method for reducing temperature difference of billet discharged from heating furnace |
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| CN103878186B (en) * | 2014-03-24 | 2015-05-06 | 华中科技大学 | Method for determining hot rolled strip steel laminar cooling temperature |
| CN103878186A (en) * | 2014-03-24 | 2014-06-25 | 华中科技大学 | Method for determining hot rolled strip steel laminar cooling temperature |
| CN104226699B (en) * | 2014-08-21 | 2016-01-27 | 南京钢铁股份有限公司 | A kind of closed loop control method of section cooling positive-negative feedback |
| CN104226699A (en) * | 2014-08-21 | 2014-12-24 | 南京钢铁股份有限公司 | Closed-loop control method for positive and negative feedback of laminar cooling |
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| CN106915060B (en) * | 2015-12-24 | 2019-06-21 | 政钰机械股份有限公司 | Hollow sheet metal forming cooling device |
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| WO2018232861A1 (en) * | 2017-06-23 | 2018-12-27 | 深圳市盛路物联通讯技术有限公司 | Infusion tube production process control method and system based on internet of things |
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| CN114423537A (en) * | 2020-08-20 | 2022-04-29 | 东芝三菱电机产业系统株式会社 | Control device of hot rolling production line |
| CN114570775A (en) * | 2020-11-30 | 2022-06-03 | 宝山钢铁股份有限公司 | Automatic control method for reducing temperature difference of billet discharged from heating furnace |
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| CN115218603B (en) * | 2022-07-15 | 2023-11-24 | 北京京诚瑞达电气工程技术有限公司 | Cooling flow control method and device |
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