CN101131572B - System for fast cooling temperature control - Google Patents

Abstract

This invention discloses a sort of control system which can cool temperature rapidly. It consists of the feed-forward control module and the feedback control module. This invention also discloses a sort of control method which can cool temperature rapidly. It includes that: The step one: initiation. The step two: the feed-forward control module obtains the materiel tracking information and the velocity change information which is in the center sect of the band iron. The step three: Processing feed-forward control. The step four: If there has no materiel tracking information or/and the velocity change information which is in the center sect of the band iron after the feed-forward control is performed in 45 seconds, performing the step fifth. The step sixth: Performing the feedback control in the cycle which has 30 seconds, and judging that whether the materiel tracking information or/and the velocity change information which is in the center sect of the band iron are imported to the feed-forward control module when each cycle finish, if yes it enters the step three, if not it performs the cycle feedback control. This invention and this system can fit to the product line of various groups.

Description

The fast cooling temperature control system

Technical field

The present invention relates to a kind of belt steel temperature control system that is applied to cold rolling mill, particularly a kind of fast cooling temperature control system.

Background technology

The control of band steel fast cooling temperature is one of core control technology of tinuous productions such as cold rolling mill continuous annealing unit, galvanizing unit, play important effect to improving the quality of products, and fast cooling temperature control system (being called for short fast cold temperature control system) is the belt steel temperature control system of tinuous productions such as cold rolling mill continuous annealing unit, galvanizing unit, has had it can fast, accurately control the temperature of band steel.

Present existing fast cooling temperature controlling models major part all is to decide according to concrete production technology producer, production technology producer difference, and its corresponding fast cooling temperature controlling models mechanism is also inequality, and response speed is slow, and control accuracy is not high yet.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of fast cooling temperature control system, can be applicable to dissimilar production lines, and has good response speed and control accuracy.

For solving the problems of the technologies described above, the present invention proposes a kind of fast cooling temperature control system, be applied to quick cool furnace (RCC, Rapid Cooling Control), described fast cooling temperature control system comprises actual central sections speed detector, electrical control equipment, temperature testing equipment, corresponding thermopair, also comprise: feedforward control module and feedback control module, be used for the RCC stove is carried out feedforward control and FEEDBACK CONTROL, with band steel the temperature when arriving RCC outlet of still of control through the RCC stove; The feedforward control module comprises input control module, calculates feedforward control module and output feedforward control module, wherein input control module is used to import coil of strip data, input distribute data, input real data, input model data, calculate the feedforward control module and be used for the calculation control variable, determine the target coil of strip, determine to carry out feedforward control, distribute control variable, output feedforward control module is used to export control variable, output adjusted value; Feedback control module comprises input control module, calculates feedback control module and output feedback control module, wherein input control module is used to import coil of strip data, input distribute data, input real data, input model data, calculate feedback control module and be used to calculate feedback controling variable, determine to carry out FEEDBACK CONTROL, Self-learning control, distribution control variable, the output feedback control module is used to export control variable, output adjusted value.

For solving the problems of the technologies described above, the invention allows for a kind of fast cooling temperature control method, can be applicable to above-mentioned system, comprising: step 1, beginning; Step 2, feedforward control module are obtained material tracking information and band steel central sections velocity variations information, and setpoint distance or band steel arrived the RCC section and export preceding setpoint distance before wherein material tracking information referred to be with steel arrival RCC section to enter the mouth; Step 3, the feedforward control of carrying out; Step 4, if carry out feedforward control after 45 seconds, no material trace information then enters described feedback control module execution in step five or/and band steel central sections velocity variations information is imported the feedforward control module; Step 6,30 seconds to be that loop cycle is carried out FEEDBACK CONTROL, judged whether material tracking information during each end cycle or/and band steel central sections velocity variations information input feedforward control module if enter step 3, if do not have, is carried out described periodic feedback control.

The present invention therefrom extract general character, thereby response speed is fast owing to taken into full account the practical operation situation of various production technology producer, the control accuracy height, and can be applicable to different production lines by the method for parameter configuration.

Description of drawings

Fig. 1 is the schematic flow sheet of the inventive method;

Fig. 2 is a system architecture synoptic diagram of the present invention;

Fig. 3 is the structural representation of system of the present invention feedforward part;

Fig. 4 is the structural representation of system feedback part of the present invention;

Fig. 5 is the structural representation of electrical equipment L1/L2/L3 etc. in the system of the present invention.

Embodiment

The present invention is further detailed explanation below in conjunction with drawings and the specific embodiments.

As shown in Figure 1, it is the schematic flow sheet of the inventive method, the flow process of having showed the inventive method on the whole, promptly comprise: the feedforward control module is obtained material tracking information and band steel central sections velocity variations information, and setpoint distance or band steel arrived the RCC section and export preceding setpoint distance before wherein material tracking information referred to be with steel arrival RCC section to enter the mouth; Carry out feedforward control; If carry out feedforward control after 45 seconds, no material trace information is or/and band steel central sections velocity variations information input feedforward control module then enters described feedback control module execution in step five; With 30 seconds was that loop cycle is carried out FEEDBACK CONTROL, had judged whether material tracking information during each end cycle or/and band steel central sections velocity variations information input feedforward control module if enter feedforward control, if do not have, is carried out described periodic feedback control.

As Fig. 2, Fig. 3, shown in Figure 4 be system architecture topological diagram of the present invention, the primary structure and the function of having showed system, promptly except that RCC (Rapid Cooling Control) stove, also comprise: feedforward control module and feedback control module, be used for the RCC stove is carried out feedforward control and FEEDBACK CONTROL, with band steel the temperature when arriving RCC outlet of still of control through the RCC stove; The feedforward control module comprises input feedforward control module, calculates feedforward control module and output feedforward control module, wherein import the feedforward control module and be used to import coil of strip data, input distribute data, input real data, input model data, calculate the feedforward control module and be used for the calculation control variable, determine the target coil of strip, determine to carry out feedforward control, distribute control variable, output feedforward control module is used to export control variable, output adjusted value; Feedback control module comprises the input feedback control module, calculates feedback control module and output feedback control module, wherein import feedback control module and be used to import coil of strip data, input distribute data, input real data, input model data, calculate feedback control module and be used to calculate feedback controling variable, determine to carry out FEEDBACK CONTROL, Self-learning control, distribution control variable, the output feedback control module is used to export control variable, output adjusted value.

Respectively feedforward control among the present invention and FEEDBACK CONTROL are told about respectively below.

One, the feedforward control of RCC (FF)

The feedforward control of RCC (Rapid Cooling Control) stove mainly is the basis reference value of the calculated with mathematical model cooling blower rotating speed of sequencing, then these data are delivered in the electric opertaing device and gone, be used for controlling the belt steel temperature of band steel when arriving the RCC outlet of still.

Carrying out feedforward control needs input variable, and main input variable comprises:

TH (THICKNESS) belt steel thickness, WD (WIDE) strip width, the actual central sections speed of Vsca (Actual centerline speed), the actual band of TSia (Actual strip temperature at entryside of RCC) steel is at the temperature value of RCC porch, the actual band of TSoa (Actual striptemperature at outside of RCC) steel is at the temperature value in RCC exit, the cooling blower revolution that RBza (Actual blower revolution) is actual, the reference value of RBzp (Referenceblower revolution) cooling blower revolution, RNb (Run status of blower) cooling blower on off state, Cc1 (Learning coeficient1) Self-learning control parameter 1, Cc2 (Learning coeficient2) Self-learning control parameter 2, Cc3 (Learningcoeficient3) Self-learning control parameter 3, Cc4 (Learning coeficient4) Self-learning control parameter 4.

And the feedforward control output variable comprises: BCm (Control mode of blower) cooling blower control mode and Om (Operation mode) mode of operation.

The feedforward control processing procedure should be regularly:

(1) calculate the temperature of object tape steel in following moment:

When 1) detecting device at X1c1 (can adjust during field adjustable) rice is preceding before pad arrives RCC stove inlet,

2) or when the detecting device at X1c2 (can adjust during field adjustable) rice is preceding before pad arrives the RCC outlet of still,

3) or when the central sections rapid change.

(2) calculate and the setting rotating speed of fan reference value in the following moment: the time is with (1).

Feedforward control has its precondition, comprising:

(1) when satisfying following condition, this function can change computer mode into:

The communication line that is L2 and L1/I and L1/E is normal.

(2) precondition of this function appointment:

1) maximal value of cooling blower speed reference is (RB1cmax) ℃

2) minimum value of cooling blower speed reference is (RB1cmin) ℃

3) if when being in the state of uncontrollable cooling blower, this function is only calculated the cooling blower speed reference.

4) if last volume almost is identical specification (thickness with follow-up roll of material, width, the target belt steel temperature), at this moment, this function is neither calculated furnace temperature reference value and heater button, do not set downwards (cooling blower speed reference, cooling blower ON-OFF, baffle plate ON-OFF, furnace temperature reference value) yet.

5) if the belt steel temperature feedforward control is under an embargo in the RCC stove, this function is setting data not.

If the belt steel temperature feedforward control is not under an embargo in the RCC stove, the cooling blower speed reference will be calculated and set to this function, and simultaneously downwards setting computer replys control mode.

If belt steel temperature feedforward control and belt steel temperature FEEDBACK CONTROL all are under an embargo in the RCC stove, this function will reset to the control mode of replying of computing machine.

Set forth the mathematical model of sequencing in the inventive method feedforward control below.

1, as previously mentioned, the target of feedforward control calculating is:

1) the target belt steel temperature when the band steel arrives the RCC outlet of still;

2) cooling blower speed reference (RBzp (i)).

2, calculate object tape steel temperature in the feedforward control, comprise as the lower part:

1) the target belt steel temperature of volume is produced in decision.

In the practical operation, the standard target belt steel temperature of coil of strip with according to heating cycle code come fixed, be TSot=TSol+Tsmo, wherein TSot (Target strip temperature atoutside of RCC) refer to when the RCC outlet of still the target belt steel temperature [℃], TSol (Standardtarget strip temperature at outside of RCC) for when the standard target belt steel temperature of last coil volume [℃], TSmo (Modify strip temperature at outside ofRCC) be the standard target belt steel temperature modified value [℃], TSmo is imported by the VDU picture by the operative employee in the practical operation.

2) the target belt steel temperature of decision transition volume.

Be TSot=TSodc+Tsmo, TSodc (Standard target dummy coiltemperature at outside of RCC), the standard target belt steel temperature of transition volume [℃].The standard target belt steel temperature of transition volume is also imported decision by the operative employee by the VDU picture.

3, calculate the cooling blower speed reference in the feedforward control, comprise as the lower part:

1) calculate at first that the specific heat CPot (spacific heat) of band steel-to the specific heat [kcal/kg ℃] of the band steel of " TSot ", its equation is CPot=g (TSot), wherein g (TSot) functional expression is

g(T)＝A ₃+2*A ₄*T+3*A ₅*T ²+4*A ₆*T ³，

Wherein the target belt steel temperature of TSot (Target strip temperature at the delivery side of RCC) when the RCC outlet of still [℃], A3, A4, A5, A6 are constant.

2) calculating adds heat-conduction coefficient HSxc (calculated inclusive convect iveheat transfer coefficient unit: kcal/m2h ℃) then, and equation is:

$\mathrm{HSxc}=\frac{\mathrm{DS}*\mathrm{CPot}*\mathrm{TH}*\mathrm{VSca}*60}{2*{\mathrm{LF}}_{1c}}*\ln \left(\frac{\mathrm{Tsit}-\mathrm{TGcaa}}{\mathrm{TSot}-\mathrm{TGcaa}}\right)$

Be band steel proportion [kg/m3] comprising parameter DS (Strip density), TH belt steel thickness [m], Vsca is an actual central sections speed [mpm], the target belt steel temperature of TSot (Target strip temperature atoutside of RCC) when the RCC outlet of still [℃], the target belt steel temperature of TSit when the RCC stove enters the mouth [℃], the average actual cooling gas temperature of TGcaa (Cooling gas temperature) [℃], the length [m] of LF1c (Strip length in the RCC) band steel in the RCC stove.

3) speed reference (RBzp (i)) of calculating cooling blower: determine

$\mathrm{Cc}0=\mathrm{Cc}1+\mathrm{Cc}2*{\mathrm{WD}}^2+\mathrm{Cc}3*\sqrt{{\mathrm{VS}}_{\mathrm{ca}}},$

Wherein parameter is respectively: WD strip width [m], the actual central sections speed of VSca [mpm], Cc1 Self-learning control parameter 1, Cc2 Self-learning control parameter 2, Cc3 Self-learning control parameter 3.

1) when HSxc＞Cc0

Calculate the reference value RB1ctc[rpm of total cooling blower rotating speed], promptly

$\mathrm{RB}1\mathrm{ctc}={\left(\frac{\mathrm{HSxc}-\mathrm{Cc}0}{\mathrm{Cc}4}\right)}^n$

Wherein parameter is respectively: HSxc calculates and adds heat-conduction coefficient [kcal/m2h ℃], Cc4 Self-learning control parameter, n constant.

Calculate cooling length (LFx), promptly

$\mathrm{LFx}=\left(\frac{\mathrm{TSit}-\mathrm{TSot}}{60\·\mathrm{Cst}}\right)\·\mathrm{VSca}$

Wherein parameter is respectively: LFx (Cooling length in the RCC) cooling length [m], Cst (Cooling Speed) temperature cooling velocity.

Calculate the speed reference Rbset of the cooling blower in total Be Controlled district, promptly

RBset＝RB1ctc-∑RB1cnta(i)

Wherein parameter is respectively: the rotating speed [rpm] of the cooling blower in the Be Controlled district that Rbset (manipulated variable of all controllablezone) is total, the actual not rotating speed of the cooling blower in Be Controlled district [rpm] of RB1cnta (i) (manipulatedvariable of all uncontrollable zone), I is the area code in Be Controlled district not, and its scope is 1 ~ 3 integer.

The rotating speed (speed reference of cooling blower) of decision cooling blower.

(a) speed reference of the cooling blower of setting pass closed region is zero.

(when the cooling blower control mode is " NG " and actual cooling blower ON-OFF for " OFF ") RBzp (i)=0, { i=1 ~ 3}.

If actual blower fan control mode is " OFF ", NO.X fan ON-OFF state is for closing so.

(IF i=1:X=1 and 2 and 3)

(IF i=2:X=4 and 5 and 6)

(b) in the speed reference of actual cooling blower, set not the speed reference of the cooling blower in Be Controlled district (when the cooling blower control mode be " NG " and actual cooling blower open～off status is during for " ON ")

RBzp(i)＝Rbza(i)，{i＝1~3}

RBza: the rotating speed of actual cooling blower [rpm]

If actual blower fan control mode for " OFF " so NO.X fan ON-OFF state for closing

(IF i=1:X=1 and 2 and 3)

(IF i=2:X=4 and 5 and 6)

(c), calculate the speed reference of cooling blower in the zone of the cooling blower in actual Be Controlled district

(RBzt(i)i＝1~X X：MAX＝6)

(when the cooling blower control mode is " OK ")

This function will be calculated the combined operation method according to assign direction, set the ON-OFF of well heater simultaneously.

RBr＝RBset

DRtr＝∑DRnz(i){i＝1～X X：MAX＝6}

$\mathrm{RBzt}\left(i\right)=\mathrm{RBr}\·\left(\frac{\mathrm{DRnz}\left(i\right)}{\mathrm{DRtr}}\right)$

If during RBzt (i)＜RBscmin, RBzt (i)=Rbscmin;

If during RBzt (i)＞RBscmax, RBzt (i)=Rbscmax;

If during RB1cmax＞RBzt (i)＞RB1cmin, RBzt (i)=RBzt (i),

I is controlled area code, and i=1 is to 3 integers; RBzt (i) is the speed reference [rpm] of cooling blower;

D) decision of the speed reference of cooling blower (RBzp (i) i=1,3),

RBzp(1)＝∑RBzt(j) j＝1～3

RBzp(2)＝∑RBzt(j) j＝4～6

The NO.j fan is opened.

When HSxc≤Cc0,

The cooling blower rotating speed of then setting All Ranges is a minimum value, promptly

RBzp (i)=RB1cmin (i=1 to 3), wherein RBzp (i) is the speed reference [rpm] of cooling blower

Also abnormality processing can appear in the feedforward control, that is:

Accept the coil of strip data of coming from L3, carry out the verification of bound legitimacy.If the coil of strip data surpass upper lower limit value, then will the control mode of replying of computing machine be resetted.

Introduce the tabulation of employed equipment of feedforward control and input/output information below.

The equipment that feedforward control is used comprises:

1) the actual central sections speed detector (L1/E refers to basic automatization, electrical equipment) of L1/E,

2) electrical control equipment (L1/E),

3) chilling temperature sensor device (L1/I refers to basic automatization, instrumentation),

Wherein L1 refers to that basic automatization level, L2 refer to that process control level computing machine, L3 refer to production control level computing machine, and production control divides level Four, from low to high, be respectively L1, L2, L3, L4, here do not improve L4, RCC refers to quick cool furnace, and (L1, L2, L3) controls RCC by three-level computer.

Following table 1 is the feedforward control input information:

No.	Data	The source
			1	Belt steel thickness	L3

2	Strip width	L3
			3	Heating cycle code	L3
4	Return volume the target belt steel temperature (SLC, RCC)	VDU
			5	The modified value of target belt steel temperature	VDU
6	Actual central sections speed	The actual central sections speed detector of L1/E
			7	The actual cooling blower rotating speed of RCC (No.1 district-No.3 district)	L1/E
8	The actual cooling blower switch of RCC shape (No.1 district～No.3 district)	L1/E
			9	RCC cooling blower state of a control (No.1 district～No.3 district)	L1/E
10	The furnace temperature mode of operation of RCC	L1/E
			11	The ON-OFF state of the actual plate washer of stove of RCC	L1/E
12	The refrigerating gas temperature	L1/I

Table 1

Following table 2 is an output information

Table 2

Two, the FEEDBACK CONTROL of RCC (FB)

The FEEDBACK CONTROL of RCC stove mainly is to adopt the mathematical model of sequencing, poor according between actual belt steel temperature and the target belt steel temperature, calculate the reference value (the No.1 district is to the No.3 district) of cooling blower rotating speed, then these data are delivered to electrical control equipment every (TSLCB) second.

The mathematical model of FEEDBACK CONTROL is revised actual online data according to the control of self study where necessary.

Carrying out FEEDBACK CONTROL needs input variable, and main input variable comprises:

The TH belt steel thickness, the WD strip width, the actual central sections speed of VSca, the actual band of TSia steel is at the temperature value of RCC porch, the actual band of TSoa steel is at the temperature value in RCC exit, the cooling blower revolution of RBza reality, the actual cooling of PNba plate washer is opened an off status, Cc1 Self-learning control parameter 1, Cc2 Self-learning control parameter 2, Cc3 Self-learning control parameter 3, Cc4 Self-learning control parameter 4, TFzp (Furnace temperature referrence) furnace temperature reference value, the actual furnace temperature value of TFza (Actualfurnace temperature), the CG computer control mode.

The FEEDBACK CONTROL output variable comprises:

The reference value of RBzp cooling blower revolution, PNb cooling plate washer are opened an off status, Om mode of operation, BCm cooling blower control mode, CG computer control mode.

The FEEDBACK CONTROL processing procedure needs regularly, promptly

(1) calculate the temperature of object tape steel in following moment:

1) after executing FEEDBACK CONTROL (TRCCF) second, every (TRCCB) second, or when the detecting device before the solder joint arrival RCC outlet of still is preceding

(2) calculate and set the reference value of cooling blower rotating speed in following moment:

1) when situation about taking place as (1)

FEEDBACK CONTROL has precondition, comprising:

1) condition of computer mode

Normal with the data chainning of L1/I and L1/E.

2) definite condition of this function:

1, the maximal value of cooling blower speed reference is (RB1cmax) ℃.

2, the minimum value of cooling blower speed reference is (RB1cmin) ℃.

3, if when being in the state of uncontrollable cooling blower, this function is only calculated the cooling blower speed reference.

4, it is identical with common volume to return the processing of volume.

5, the maximum reference value of cooling blower rotating speed is (DNS) rpm.

If the difference between 6 actual belt steel temperatures and the target belt steel temperature will not carried out the FEEDBACK CONTROL of this function less than (DTSd) ℃.

If the feedback control beginning of 7 RCC stokeholds, then FEEDBACK CONTROL finishes.

8, if the feedback control model of the belt steel temperature of RCC stove is under an embargo, will be not to dividing into reference value data (cooling blower speed reference, cooling blower ON-OFF, actual refrigerated baffle ON-OFF).If the feedback control model of the belt steel temperature of RCC stove is not under an embargo, this function will be calculated the cooling blower speed reference and set downwards, the while setting computer reply control signal.If belt steel temperature feedforward control and feedback controlling models forbidden simultaneously, the replying control signal and will be reset of computing machine.

If 9 self studies are under an embargo, Self-learning control will not be performed.

10, the Self-learning control of each coil of strip is only carried out once.

If 11 delay sections after the central sections velocity variations change a little again, and time delay less than T1 second, this function will not carried out Self-learning control this moment.

If the actual belt steel temperatures of 12 inlets and the absolute value of the difference between the actual belt steel temperature of outlet will not carried out the Self-learning control of this function less than (DTSm) ℃.

Set forth the mathematical model of sequencing in the inventive method FEEDBACK CONTROL below.

1, as previously mentioned, the target of FEEDBACK CONTROL calculating is:

1) the target belt steel temperature when the band steel arrives the RCC outlet of still;

2) the Self-learning control parameter (Cc1, Cc2, Cc3, Cc4)

3) cooling blower speed reference (RBzp (i)).

2, calculate object tape steel temperature in the FEEDBACK CONTROL, criterion is consistent with the feedforward control of RCC stove.

3, self study CALCULATION OF PARAMETERS in the FEEDBACK CONTROL (Cc3 Cc4), comprises as the lower part for Cc1, Cc2:

1) calculates specific heat (CPoa-is to the specific heat [kcal/kg ℃] of the band steel of " TSoa ") and (Cpot-is to the specific heat [kcal/kg ℃] of the band steel of " TSot ") of being with steel, be CPoa=g (TSoa), CPot=g (TSot), wherein the functional relation of g (TSoa) and g (TSot) is:

g(T)＝A ₃+2*A ₄*T+3*A ₅*T ²+4*A ₆*T ³，

Wherein parameter is respectively: the actual belt steel temperature of TSoa when the RCC outlet of still [℃], the target belt steel temperature of TSot when the RCC outlet of still [℃], A3, A4, A5, A6 are constant.

The heating coefficient of migration HSxa of 2) calculating reality (coefficient[kcal/m2hr ℃ of actual inclusive convectiveheat transfer])

$\mathrm{HSxa}=\frac{\mathrm{DS}*\mathrm{TH}*\mathrm{VScaa}*\mathrm{CPoa}*60}{2*\mathrm{LF}1c}*\ln \left(\frac{\mathrm{TSiax}-\mathrm{TGcaa}}{\mathrm{TSoa}-\mathrm{TGcaa}}\right)$

Wherein parameter is respectively: DS is with steel proportion [kg/m3], TH belt steel thickness [m], the specific heat of CPoa " TSoa " [kcal/kg ℃], Tsiax (Actual strip temperature at theentry side of RCC) band steel RCC enter the mouth corresponding TSoa actual temperature [℃], the actual temperature that TSia (N) (Actual strip temperature at the delivery side of RCC) band steel enters the mouth at RCC [℃], TSoa band steel RCC export actual temperature [℃], the length [m] of LFsc band steel in the RCC stove, TGcaa (Actual Cooling gas temperature) actual average cooling gas temperature [℃], VScaa (Average center line speed) actual central sections average velocity [mpm].

3) the heating coefficient of migration HSxc of calculation requirement (heattransfer[kcal/m2hr ℃ of target inclusive convective]), that is:

$\mathrm{HSxc}=\mathrm{Cc}1+\mathrm{Cc}2*{\mathrm{WD}}^2+\mathrm{Cc}3*\sqrt{\mathrm{VScaa}}+\mathrm{Cc}4*{\mathrm{RBzat}}^{1/n}$

Wherein parameter is respectively: the actual central sections average velocity of VScaa [mpm], WD strip width, Cc1 self study parameter 1, Cc2 self study parameter 2, Cc3 self study parameter 3, Cc4 self study parameter, n are constant.

4) calculate self study parameters C c1, Cc2, Cc3, Cc4, the correction of self study parameter is to forget that according to band the minimum dichotomy of coefficient finishes in the FEEDBACK CONTROL.

4, calculate cooling blower speed reference (RBzp (i)) in the FEEDBACK CONTROL, comprising:

Temperature difference TSod[℃ of theory of computation band steel], promptly

TSod＝TSot-TSoa，

Wherein parameter is respectively: the target belt steel temperature of TSot when the RCC outlet of still [℃], the actual belt steel temperature of TSoa when the RCC outlet of still [℃].

The hot coefficient of migration DHSsc of the variation that calculation requirement calculates (coefficient[kcal/m2h ℃ of the changing value of*calculated inclusive convective heat transfer]), that is:

$\mathrm{DHS}1c=-\mathrm{GB}*\frac{\mathrm{DS}*\mathrm{TH}*60*\mathrm{CPca}*\mathrm{VScaa}}{2*\mathrm{LF}1c*(\mathrm{TSca}-\mathrm{TGcaa})}*\mathrm{TSod},$

Wherein parameter is respectively: GB feedback control gain parameter, and if Tsod 〉=0 o'clock, GB=GB1, if Tsod＜0 o'clock, GB=GB2; DS is with steel proportion [kg/m3]; TH belt steel thickness [m]; The actual central sections average velocity of VScaa [mpm]; The length [m] of LF1c band steel in the RCC stove; TGsc actual average cooling gas temperature [℃].

Calculate cooling blower speed reference (RBzp (i)), comprising: determine earlier

$\mathrm{Cc}0=\mathrm{Cc}1+\mathrm{Cc}2*{\mathrm{WD}}^2+\mathrm{Cc}3*\sqrt{\mathrm{VScaa}},$

Wherein parameter is respectively: WD strip width, the actual central sections average velocity of VScaa [mpm], Cc1 self study parameter 1, Cc2 self study parameter 2, Cc3 self study parameter 3, Cc4 self study parameter 4;

When HSxt＞Cc0,

1. calculate the reference value DRBsc[rpm of the target cooling blower rotating speed that changes], promptly

$\mathrm{DRB}1c=\frac{n*{(\mathrm{HSxt}-\mathrm{Cc}0)}^{n-1}}{{\mathrm{Cc}4}^n}*\mathrm{DHS}1c,$

Wherein parameter is respectively: the actual heating of HSxt coefficient of migration [kcal/m2h ℃], WD strip width, Cc4 self study parameter, n are constant;

2. the target cooling blower that changes is carried out the limit check of rotating speed:

If during DRB1c＞DNC, DRB1c=DNC then; If DRB1c＜-during DNC, DRB1c=-DNC then; Wherein DNC is the maximum changing value [rpm] of cooling blower rotating speed, and DRB1c is a target cooling blower change in rotational speed value [rpm].

3. calculate the speed reference RB1ctc of the cooling blower in total Be Controlled district, promptly

RB1ctc＝RBzat+DRB1c

Wherein parameter is respectively: rotating speed [rpm] and the Rbzat=∑ Rbza (i) and { i=1-6} of the actual cooling blower that the change in rotational speed value [rpm] of DRB1c target cooling blower, RBzat are total.

4. determine the speed reference [rpm] of cooling blower, with feedforward control.

When HSxt＜Cc0, the cooling blower rotating speed of setting All Ranges is a minimum value, i.e. RBzp (i)=RB1cmin, (i=1 to 3), wherein RBzp (i) is the speed reference [rpm] of cooling blower

Also abnormality processing can appear in the FEEDBACK CONTROL, that is:

Accept the coil of strip data of coming from L3, carry out the verification of bound legitimacy.If the coil of strip data surpass upper lower limit value, then will the control mode of replying of computing machine be resetted.

Introduce the tabulation of employed equipment of FEEDBACK CONTROL and input/output information below.

The equipment that FEEDBACK CONTROL is used comprises:

1) actual central sections speed detector (L1/E);

2) electrical control equipment (L1/E);

3) corresponding thermopair (L1/I);

4) radiation thermometer (L1/I);

Following table 3 is FEEDBACK CONTROL input informations:

No.

Data

The source

1	Belt steel thickness	L3
			2	Strip width	L3
3	Heating cycle code	L3
			4	Return the target belt steel temperature (SLC) of volume	VDU
5	The modified value of target belt steel temperature	VDU
			6	Actual central sections speed	The actual central sections speed detector (L1/E) of L1/E
7	The actual cooling blower rotating speed of RCC (No.1 district～No.3 district)	(L1/E)
			8	The actual cooling blower of RCC " switch " state (No.1 district～No.3 district)	(L1/E)
9	The actual refrigerated baffle control mode of RCC (No.1 district～No.3 district)	(L1/E)
			10	The actual refrigerating gas temperature of RCC	(L1/I)
11	The band steel is in the actual temperature of RCC inlet	(L1/I)
			12	The band steel exports actual temperature at RCC	(L1/I)
13	The blower fan control mode of RCC stove	(L1/E)
			14	The RCC mode of operation	(L1/E)

Table 3

Following table 4 is an output information:

In sum, method of the present invention is that system has taken into full account various production technology producer ruuning situation, therefrom extracts general character, and response speed is fast, the control accuracy height, and can make the present invention can be applicable to different production lines by the method for parameter configuration.The present invention can: realize the belt steel temperature control function of fast cold cool furnace, export rotation speed of fan automatically; Use the way of configuration parameter to set up fast cold Temperature Control Model; Adopted the method for regression Calculation to determine the model parameter initial value, made the model input very fast; The correction of model self study parameter is to forget that according to band the minimum dichotomy of coefficient finishes; Irrelevant with concrete production technology producer; Software is adapted to different computer platforms.

Claims (1)

1. a fast cooling temperature control system is applied to the RCC stove, and described fast cooling temperature control system comprises actual central sections speed detector, electrical control equipment, temperature testing equipment, corresponding thermopair,

It is characterized in that, comprising: feedforward control module and feedback control module are used for described RCC stove is carried out feedforward control and FEEDBACK CONTROL, with band steel the temperature when arriving RCC outlet of still of control through described RCC stove; Described feedforward control module comprises input control module, calculates feedforward control module and output feedforward control module, wherein said input control module is used to import coil of strip data, input distribute data, input real data, input model data, described calculating feedforward control module is used for the calculation control variable, determines the target coil of strip, determines to carry out feedforward control, distributes control variable, and described output feedforward control module is used to export control variable, output adjusted value; Described feedback control module comprises input control module, calculates feedback control module and output feedback control module, wherein input control module is used to import coil of strip data, input distribute data, input real data, input model data, calculate feedback control module and be used to calculate feedback controling variable, determine to carry out FEEDBACK CONTROL, Self-learning control, distribution control variable, the output feedback control module is used to export control variable, output adjusted value.

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