CN111420998B - Method for uniformly heating width of precision rolling intermediate billet in length direction at temperature - Google Patents
Method for uniformly heating width of precision rolling intermediate billet in length direction at temperature Download PDFInfo
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- CN111420998B CN111420998B CN201910023178.0A CN201910023178A CN111420998B CN 111420998 B CN111420998 B CN 111420998B CN 201910023178 A CN201910023178 A CN 201910023178A CN 111420998 B CN111420998 B CN 111420998B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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Abstract
The invention discloses a method for uniformly heating the width temperature of a finish rolling intermediate billet in the length direction, which changes the heating control parameters of the current edge heater by establishing a feedforward control model and a feedback control model, can effectively solve the problems of poor heating effect of the edge heater and frequent under-heating and over-heating phenomena on the transmission side and the working side of a strip steel and improve the integral edge quality of a hot rolling strip steel finished product. The invention improves the heating uniformity effect of the transmission side and the working side of the hot-rolled intermediate billet by utilizing the existing equipment through a heating method; when the temperature difference between the transmission side and the working side of the strip steel billet is large, the heating given power of the two sides can be adjusted, the integral power output of the edge heater is reduced while the edge heating effect is achieved, and the power consumption is saved; the hot rolling and finish rolling device has the advantages of good universality, high adaptability and higher reliability, and is suitable for other hot rolling and finish rolling blank edge heaters controlled by a PLC logic program.
Description
Technical Field
The invention relates to the field of hot rolling electrical technology, in particular to a method for uniformly heating the width of a finish rolling intermediate billet in the length direction at a temperature.
Background
In the hot rolling process, the strip steel blank passes through an SP (large side pressure rolling mill), an R1 and an R2 roughing mill in sequence and then is subjected to final reduction rolling by a finishing mill. The Edge Heater (EH) is arranged in front of the finishing mill and is used for heating the edge of the strip steel billet (particularly the type of silicon steel) so as to ensure that the temperature of the two sides of the edge of the strip steel billet reaches better temperature uniformity. The heating control of the original 1580 edge heater is given according to empirical parameters, in the empirical parameters of the day, the temperature difference between the transmission side edge part and the working side edge part of the strip steel is not considered, and the heating given values of the two sides are the same. The defects are mainly shown as follows: 1) in the actual application process, if the temperature of the transmission side edge part of the strip steel is higher than that of the working side edge part, and the heating on the two sides of the edge part of the strip steel is given as a fixed value, overcompensation heating occurs on the transmission side edge part of the strip steel, undercompensation heating occurs on the working side edge part of the strip steel, so that the integral temperature uniformity effect of the strip steel blank is influenced, and vice versa; 2) particularly for the types of silicon steel, the uniformity effect of the temperature of the two side parts of the strip steel blank heated by the side part heater has an important influence on the product quality.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects that the edge heater in the prior art has poor heating effect and the phenomena of under-heating and over-heating of the transmission side or the working side of the edge of the strip steel frequently occur, the invention provides a method for uniformly heating the width temperature of the intermediate blank in the length direction of the finish rolling, which changes the heating control parameters of the edge heater at present and improves the edge quality of the hot rolled strip steel finished product (particularly high-grade silicon steel) by establishing a feedforward control model and a feedback control model.
(II) technical scheme
A method for uniformly heating the width of a finish-rolled intermediate billet in the length direction at a temperature comprises the following steps:
s1, after the strip steel intermediate billet enters a finish rolling area, the head of the strip steel intermediate billet reaches the inlet of an edge heater, after the head is detected by a hot metal detector HMD413, the edge heater starts to start vibration, and a transmission side and a working side heat and simultaneously use the heating power set by an upper computer L2 to give Pd for output;
s2, after the strip steel enters the edge heater inlet temperature measuring instrument, the feed-forward function of the edge heater is used, the feed-forward control model receives the temperatures of the transmission side and the working side of the strip steel detected by the inlet temperature measuring instrument in real time, and when the absolute value of the temperature difference between the two sides of the actually-measured strip steel is smaller than or equal to an allowable value T1, the feed-forward heating set value Pwb of the edge heater is 0; when the absolute value of the actually measured temperature difference of the two sides of the strip steel is larger than an allowable value T1, the feedforward control model carries out calculation, and finally, a feedforward heating given Pwb is given and enters the heating given of the working side and the heating given of the transmission side respectively, and the positive and the negative are opposite;
s3, when the head of the strip steel reaches the edge heater outlet temperature measuring instrument, the feed-forward function of the edge heater is stopped, the feedback heating control of the edge heater is used, and the feedback heating control model of the edge heater receives the temperatures of the working side and the transmission side of the strip steel measured by the edge heater outlet temperature measuring instrument in real time; when the temperature difference between two sides of the strip steel measured in real time is less than or equal to an allowable value T2, the feedback heating given by the edge heater feedback control model is 0; when the temperature difference between the two sides of the strip steel measured in real time is greater than an allowable value T2, calculating by using the edge heater feedback control model, and finally giving a feedback heating given Pbw; the head of the strip steel reaches an outlet thermodetector of the edge heater, the heating power of the edge heater is given and equal to the heating given value of the edge heater and the feedback heating given Pbw at the previous moment;
and S4, the tail part of the strip steel leaves the heating area of the edge heater, and after the tail part of the strip steel is detected by the hot metal detector HMD414, the edge heater stops heating and waits for the next strip steel.
Preferably, the heating power given Pd calculation formula of step S1
Pd＝∑ΔPd＝K×vd×td×cd×yd×(ΔTd×Δwd)，
Wherein, Pd: heating a given value by a strip steel reference; td is the thickness of the reference strip steel; vd is the reference strip steel linear velocity; cd is the heat capacity of the reference strip steel; yd is the density of the reference strip steel; k: a scaling factor; delta Td is the reference strip steel temperature difference; and delta wd is the width difference of the reference strip steel.
Preferably, after the temperature difference between the transmission side and the working side of the strip steel is introduced in step S2, the formula of the feedforward control of the transmission side of the strip steel is as follows:
Pdb(DS)
＝Pd-Pwb(DS)
＝Pd-[1/2×K×tdb×vd×cd×yd×td×f(y)]，
the feedforward control formula at the working side of the strip steel is as follows:
Pdb(WS)
＝Pd+Pwb(WS)
＝Pd+[1/2×K×tdb×vd×cd×yd×td×f(y)]，
wherein Pd is given by the reference heating power of the strip steel; pwb (WS) feed-forward heating setting of the working side of the strip steel; pwb (DS) feed-forward heating setting of the strip steel transmission side; k is a proportion adjustment coefficient; tdb is the temperature difference between the working side and the transmission side of the strip steel; vd is the reference strip steel linear velocity; td is the thickness of the reference strip steel; cd is the heat capacity of the reference strip steel; yd is the density of the reference strip steel; (y) empirically adjusting the parameters.
Preferably, the feedback control process of step S3 is as follows:
1) dividing the strip steel into 2 detection areas in the width direction, wherein the detection areas are respectively the strip steel transmission side edge temperature T1 and the strip steel working side edge temperature T2;
2) performing statistical processing on the collected T1-T2 in each sampling time unit, filtering out wild values, and performing smoothing processing to prevent frequent adjustment of feedback control;
3) the feedback control adjusts the driving side deviation feedback heating given Pbw1 and the working side deviation feedback heating given Pbw2 according to the temperature difference delta T which is T1-T2;
4) and when the delta T is too large, the heating power of the transmission side and the working side is adjusted, and finally the delta T is maintained in a reasonable range.
Preferably, the calculation formula of the drive side deviation feedback heating given Pbw1 and the working side deviation feedback heating given Pbw2 is as follows:
wherein the content of the first and second substances,
Kp×En: feeding back a proportional output item of the heating model PI regulator;
(Ki×En)Δt+Pbw1n-1、(Ki×En)Δt+Pbw2n-1: respectively a feedback model output item at the previous moment of the transmission side and a feedback model output item at the previous moment of the working side;
ΔTset(n): the temperature difference between the transmission side and the working side of the edge heater is fed back to control the target temperature deviation set value;
ΔTact(n): the temperature difference between the transmission side and the working side of the strip steel detected by a strip steel thermodetector at the outlet of the edge heater; en＝ΔTset(n)-ΔTact(n)。
(III) advantageous effects
By adopting the technical scheme of the invention, the method for uniformly heating the width temperature of the finish rolling intermediate billet in the length direction changes the heating control parameters of the current edge heater by establishing a feedforward control model and a feedback control model, and improves the edge quality of a hot rolled strip steel finished product (particularly high-grade silicon steel). Compared with the prior art, the method has the following advantages: (1) the heating uniformity effect of the transmission side and the working side of the hot-rolled intermediate billet is improved by utilizing the existing equipment through a heating method; (2) when the temperature difference between the transmission side and the working side of the strip steel billet is large, the heating given power of the two sides can be adjusted, the integral power output of the edge heater is reduced while the edge heating effect is achieved, and the power consumption is saved; (3) the hot rolling and finish rolling device has the advantages of good universality, high adaptability and higher reliability, and is suitable for other hot rolling and finish rolling blank edge heaters controlled by a PLC logic program.
Drawings
In the present invention, like reference numerals refer to like features throughout, wherein:
FIG. 1 is a layout diagram of an apparatus related to a finishing edge heater;
FIG. 2 is a block diagram of the edge heater heating control logic of the present invention;
FIG. 3 is a graph of the surface temperature profile of a steel blank in an edge heater inlet;
FIG. 4 is a logic diagram of a feedforward control model;
FIG. 5 is a logic diagram of a feedback heating control model;
FIG. 6 is a flow chart of control data for uniform heating on both sides of the edge heater;
FIG. 7 is a graph illustrating an embodiment of the present invention.
Notation of symbols:
HMD 413: an edge heater inlet hot metal detector;
the HMD 414: an edge heater outlet hot metal detector;
pd: heating and setting the strip steel reference;
pdb (ds): the driving side of the edge heater feeds forward a heating model to output a heating given value;
pdb (ws): the working side of the edge heater feeds forward a heating model to output a heating given value;
td is the temperature rise of the strip steel on the basis;
vd is the reference strip steel linear velocity;
td is the thickness of the reference strip steel;
cd is the heat capacity of the reference strip steel;
yd is the density of the reference strip steel;
k: a scaling factor;
(y) empirically adjusting the parameters;
pbw 1: the driving side of the edge heater feeds back a heating model to output a heating given value;
pbw 2: the driving side of the edge heater feeds back a heating model to output a heating given value;
Kp×En: feeding back a proportional output item of the heating model PI regulator;
(Ki×En)Δt+Pbwn-1: outputting an item by the model at the previous moment;
k1x (x ═ 0-9): the strip steel width temperature drop characteristic layering compensation coefficient;
A0-A9: the band steel width temperature drop compensation layering proportion gain coefficient is 0-9;
W0-W9 is the layering interval value of ten sections of the width of the strip steel;
B0-B9, the strip steel width temperature drop compensation layered adjustment coefficient is 0-9;
k2x (x ═ 0-9): the temperature drop characteristic of the strip steel in the length direction is compensated by layers;
C0-C9: the temperature drop compensation layering proportion gain coefficient in the length direction of the strip steel is 0-9;
L0-L9 is the value of the remaining ten segments of the layering interval of the length of the strip steel;
D0-D9, wherein the temperature drop compensation layered adjustment coefficient in the length direction of the strip steel is 0-9.
Detailed Description
The technical scheme of the invention is further explained by combining the drawings and the embodiment.
Referring to FIG. 1, in the layout of the equipment related to the finish rolling edge heater, an edge heater inlet thermometer is installed on the inlet side (in the incoming direction of the strip steel blank) of the edge heater to detect the surface temperature of the incoming blank; the edge heater is provided with an edge heater outlet temperature measuring instrument for detecting the surface temperature of the strip steel after being heated by the edge heater.
With reference to the logic diagram of heating control of the edge heater in fig. 2, a method for uniformly heating the width of a finish rolling intermediate slab in the length direction at a temperature, comprises the following steps:
s1, after the strip steel intermediate billet enters the finish rolling area, the head of the strip steel intermediate billet reaches the inlet of the edge heater, after the head is detected by the hot metal detector HMD413, the edge heater starts to start vibration, and the transmission side and the working side heat and use the heating power set by the upper computer L2 to give Pd for output.
One thickness is td, density is yd, and the width is wd, and the heat capacity is that belted steel advances with speed vd, and belted steel intermediate temperature is T1, because the radiating rate is uneven, and the intermediate heat dissipation is slow, and both sides heat dissipation is fast, and the temperature of certain little unit of this limit portion is T2, and there is the difference in temperature DeltaT with the intermediate temperature, gives this little unit heating now, makes it and intermediate temperature, then heating power gives the required power of calculation and is:
Pd＝∑ΔPd＝K×vd×td×cd×yd×(ΔTd×Δwd)
the linear relation between the heating power of the strip steel and the strip steel linear speed vd, the strip steel thickness td, the strip steel density yd and the strip steel heat capacity cd can be known by the formula.
S2, after the strip steel enters the edge heater inlet temperature measuring instrument, the feed-forward function of the edge heater is used, the feed-forward control model receives the temperatures of the transmission side and the working side of the strip steel detected by the inlet temperature measuring instrument in real time, and when the absolute value of the temperature difference between the two sides of the actually-measured strip steel is smaller than or equal to an allowable value T1, the feed-forward heating set value Pwb of the edge heater is 0; and when the absolute value of the actually measured temperature difference of the two sides of the strip steel is larger than the allowable value T1, the feedforward control model carries out calculation, and finally, the feedforward heating given Pwb is given and is respectively fed into the heating given of the working side and the heating given of the transmission side, and the positive and the negative are opposite.
Establishing a feed-forward control model:
referring to fig. 3, it is seen from the profile of the surface temperature of the slab at the edge heater inlet that the temperature drop Δ t of the slab in the width direction is mainly concentrated at about 100mm at the edge. The temperature drop of the distance y between one side of the strip and the edge is delta t ═ k (100-y), and a feed-forward heating power given model formula is as follows:
Pd＝∑ΔPd＝K×vd×td×cd×yd×(ΔTd×Δwd)
＝K×vd×td×cd×yd×Td×f(y)
wherein: td is the temperature rise of the strip steel on the basis; pd is the heating power of the reference strip steel; vd is the reference strip steel linear velocity; td is the thickness of the reference strip steel; cd is the heat capacity of the reference strip steel; yd is the density of the reference strip steel; (y) empirically adjusting the parameters; delta Td is the reference strip steel temperature difference; and delta wd is the width difference of the reference strip steel.
After the temperature difference between the transmission side and the working side of the strip steel is introduced, the feedforward control model is shown in figure 4, and the feedforward control formula of the transmission side of the strip steel is as follows:
Pdb(DS)
＝Pd-Pwb(DS)
＝Pd-[1/2×K×tdb×vd×cd×yd×td×f(y)]
the feedforward control formula at the working side of the strip steel is as follows:
Pdb(WS)
＝Pd+Pwb(WS)
＝Pd+[1/2×K×tdb×vd×cd×yd×td×f(y)]
wherein Pd is given by the reference heating power of the strip steel; pwb (WS) feed-forward heating setting of the working side of the strip steel; pwb (DS) feed-forward heating setting of the strip steel transmission side; k is a proportion adjustment coefficient; tdb is the temperature difference between the working side and the transmission side of the strip steel; vd is the reference strip steel linear velocity; td is the thickness of the reference strip steel; cd is the heat capacity of the reference strip steel; yd is the density of the reference strip steel; (y) empirically adjusting the parameters.
S3, when the head of the strip steel reaches the edge heater outlet temperature measuring instrument, the feed-forward function of the edge heater is stopped, the feedback heating control of the edge heater is used, and the feedback heating control model of the edge heater receives the temperatures of the working side and the transmission side of the strip steel measured by the edge heater outlet temperature measuring instrument in real time; when the temperature difference between two sides of the strip steel measured in real time is less than or equal to an allowable value T2, the feedback heating given by the edge heater feedback control model is 0; when the temperature difference between the two sides of the strip steel measured in real time is greater than an allowable value T2, calculating by using the edge heater feedback control model, and finally giving a feedback heating given Pbw; the head of the strip steel reaches an outlet thermodetector of the edge heater, and the heating power of the edge heater is given to be equal to the heating given value of the edge heater and the feedback heating given Pbw at the previous moment.
Establishing a feedback control model:
1) dividing the strip steel into 2 detection areas in the width direction, wherein the detection areas are respectively the strip steel transmission side edge temperature T1 and the strip steel working side edge temperature T2;
2) performing statistical processing on the collected T1-T2 in each sampling time unit, filtering out wild values, and performing smoothing processing to prevent frequent adjustment of feedback control;
3) the feedback control adjusts the driving side deviation feedback heating given Pbw1 and the working side deviation feedback heating given Pbw2 according to the temperature difference delta T which is T1-T2;
4) the basic principle of the feedback control is to adjust the heating power of the transmission side and the working side when the Δ T is too large, and finally maintain the Δ T within a reasonable range.
The feedback heating control model is shown in fig. 5.
Pbw 1: the driving side of the edge heater feeds back a heating model to output a heating given value;
pbw 2: the driving side of the edge heater feeds back a heating model to output a heating given value;
Kp×En: feeding back a proportional output item of the heating model PI regulator;
(Ki×En)Δt+Pbw1n-1、(Ki×En)Δt+Pbw2n-1: respectively a feedback model output item at the previous moment of the transmission side and a feedback model output item at the previous moment of the working side;
ΔTset(n): the temperature difference between the transmission side and the working side of the edge heater is fed back to control the target temperature deviation set value;
ΔTact(n): the temperature difference between the transmission side and the working side of the strip steel detected by a strip steel thermodetector at the outlet of the edge heater; en＝ΔTset(n)-ΔTact(n)；
Since the heating capacity of the strip edge heater is limited, the feedback control output needs to be limited in order to protect the equipment.
And S4, the tail part of the strip steel leaves the heating area of the edge heater, and after the tail part of the strip steel is detected by the hot metal detector HMD414, the edge heater stops heating and waits for the next strip steel.
And combining a uniform heating control data flow diagram on two sides of the edge heater in a graph of fig. 6, inputting the temperatures of the working side and the transmission side of the strip steel into a feed-forward control model of the edge heater by an edge heater inlet temperature measuring instrument, judging the temperature difference of the two sides of the strip steel according to the actually measured temperature difference by the feed-forward control model when the head of the strip steel enters the edge heater inlet temperature measuring instrument and does not reach an outlet temperature measuring instrument, and outputting a feed-forward compensation heating given Pdb. The edge heater baseline heating settings are given by the upper computer L2. And after the head of the strip steel reaches the outlet temperature measuring instrument, the temperature of the working side and the temperature of the transmission side of the strip steel heated by the edge heater are input into a feedback heating model, and the model calculates the feedback heating compensation given Pbw.
In the whole heating process, the characteristics of extremely fine temperature drop of the width of the strip steel and the temperature drop of the length direction of the strip steel are layered, and a compensation coefficient is given to participate in heating control. Each heating setting is clipped due to the limited heating capacity of the edge heater.
Finally, the comprehensive heating setting is sent to the edge heater transmission control panel by a PLC (dashed box part in the figure), and finally the heating setting voltage is output to the edge heater induction head after amplitude limiting.
As shown in fig. 7, from the uppermost curve, the following are in order: the actual value of the temperature of 25mm at the strip steel transmission side edge part, the actual value of the temperature of 75mm at the strip steel transmission side edge part, the actual value of the temperature at 1/4 at the strip steel transmission side edge part, the actual value of the temperature at 1/4 at the strip steel working side edge part, the actual value of the temperature of 75mm at the strip steel working side edge part and the actual value of the temperature of 25mm at the strip steel working side edge part.
The actual value curve of 25mm temperature at the working side of the strip steel is as follows:
the line A is the actual temperature deviation value between the transmission side and the working side of the strip steel at the side feeding port;
the line B is the actual temperature deviation value of the transmission side and the working side of the strip steel with the side outlet;
the line C is a comprehensive given curve for heating the transmission side of the strip steel;
and the line D is a comprehensive given curve for heating the working side of the strip steel.
The method for uniformly heating the width of the finish rolling intermediate billet in the length direction has good effect of heating the edge of the strip steel, and can be widely applied to a PLC (programmable logic controller) controlled strip steel intermediate billet edge heating device.
In conclusion, by adopting the technical scheme of the invention, the method for uniformly heating the width temperature of the finish rolling intermediate billet in the length direction changes the heating control parameters of the current edge heater by establishing a feedforward control model and a feedback control model, and improves the edge quality of the hot rolled strip steel finished product (particularly high-grade silicon steel).
Compared with the prior art, the method has the following advantages:
(1) the heating uniformity effect of the transmission side and the working side of the hot-rolled intermediate billet is improved by utilizing the existing equipment through the heating method.
(2) When the temperature difference between the transmission side and the working side of the strip steel billet is large, the heating given power of the two sides can be adjusted, the integral power output of the edge heater is reduced while the edge heating effect is achieved, and the power consumption is saved.
(3) The hot rolling and finish rolling device has the advantages of good universality, high adaptability and higher reliability, and is suitable for other hot rolling and finish rolling blank edge heaters controlled by a PLC logic program.
Claims (5)
1. A method for uniformly heating the width of a finish-rolled intermediate billet in the length direction at a temperature is characterized by comprising the following steps of: the method comprises the following steps:
s1, after the strip steel intermediate billet enters a finish rolling area, the head of the strip steel intermediate billet reaches the inlet of an edge heater, after the head is detected by a hot metal detector HMD413, the edge heater starts to start vibration, and a transmission side and a working side heat and simultaneously use the heating power set by an upper computer L2 to give Pd for output;
s2, after the strip steel enters the edge heater inlet temperature measuring instrument, the feed-forward function of the edge heater is used, the feed-forward control model receives the temperatures of the transmission side and the working side of the strip steel detected by the edge heater inlet temperature measuring instrument in real time, and when the absolute value of the temperature difference of the two sides of the actually-measured strip steel is smaller than or equal to an allowable value T1, the given Pwb of the feed-forward heating of the edge heater is 0; when the absolute value of the actually measured temperature difference of the two sides of the strip steel is larger than an allowable value T1, the feedforward control model carries out calculation, and finally, a feedforward heating given Pwb is given and enters the heating given of the working side and the heating given of the transmission side respectively, and the positive and the negative are opposite;
s3, when the head of the strip steel reaches the edge heater outlet temperature measuring instrument, the feed-forward function of the edge heater is stopped, the feedback heating control of the edge heater is used, and the feedback heating control model of the edge heater receives the temperatures of the working side and the transmission side of the strip steel measured by the edge heater outlet temperature measuring instrument in real time; when the temperature difference between two sides of the strip steel measured in real time is less than or equal to an allowable value T2, the feedback heating given by the edge heater feedback control model is 0; when the temperature difference between the two sides of the strip steel measured in real time is greater than an allowable value T2, calculating by using the edge heater feedback control model, and finally giving a feedback heating given Pbw; the head of the strip steel reaches an outlet thermodetector of the edge heater, the heating power of the edge heater is given and equal to the heating given value of the edge heater and the feedback heating given Pbw at the previous moment;
and S4, the tail part of the strip steel leaves the heating area of the edge heater, and after the tail part of the strip steel is detected by the hot metal detector HMD414, the edge heater stops heating and waits for the next strip steel.
2. The finish-rolled intermediate slab length-direction width temperature uniform heating method according to claim 1, characterized in that: step S1 calculation formula for heating power given Pd
Pd＝∑ΔPd＝K×vd×td×cd×yd×(ΔTd×Δwd)，
Wherein, Pd: setting the reference heating power of the strip steel; td is the thickness of the reference strip steel; vd is the reference strip steel linear velocity; cd is the heat capacity of the reference strip steel; yd is the density of the reference strip steel; k: a scaling factor; delta Td is the reference strip steel temperature difference; and delta wd is the width difference of the reference strip steel.
3. The finish-rolled intermediate slab length-direction width temperature uniform heating method according to claim 2, characterized in that: after the temperature difference between the transmission side and the working side of the strip steel edge is introduced in the step S2, the feedforward control formula of the transmission side of the strip steel is as follows:
Pdb(DS)
＝Pd-Pwb(DS)
＝Pd-[1/2×K×tdb×vd×cd×yd×td×f(y)]，
the feedforward control formula at the working side of the strip steel is as follows:
Pdb(WS)
＝Pd+Pwb(WS)
＝Pd+[1/2×K×tdb×vd×cd×yd×td×f(y)]，
wherein Pd is given by the reference heating power of the strip steel; pwb (WS) feed-forward heating setting of the working side of the strip steel; pwb (DS) feed-forward heating setting of the strip steel transmission side; k is a proportion adjustment coefficient; tdb is the temperature difference between the working side and the transmission side of the strip steel; vd is the reference strip steel linear velocity; td is the thickness of the reference strip steel; cd is the heat capacity of the reference strip steel; yd is the density of the reference strip steel; (y) empirically adjusting the parameters.
4. The finish-rolled intermediate slab length-direction width temperature uniform heating method according to claim 1, characterized in that: the step S3 feedback control process is as follows:
1) dividing the strip steel into 2 detection areas in the width direction, wherein the detection areas are respectively the strip steel transmission side edge temperature T1 and the strip steel working side edge temperature T2;
2) performing statistical processing on the collected T1-T2 in each sampling time unit, filtering out wild values, and performing smoothing processing to prevent frequent adjustment of feedback control;
3) the feedback control adjusts the driving side deviation feedback heating given Pbw1 and the working side deviation feedback heating given Pbw2 according to the temperature difference delta T which is T1-T2;
4) and when the delta T is too large, the heating power of the transmission side and the working side is adjusted, and finally the delta T is maintained in a reasonable range.
5. The finish-rolled intermediate slab length-direction width temperature uniform heating method according to claim 4, characterized in that: the calculation formulas of the drive side deviation feedback heating given Pbw1 and the working side deviation feedback heating given Pbw2 are as follows:
wherein the content of the first and second substances,
Kp×En: feeding back a proportional output item of the heating model PI regulator;
(Ki×En)Δt+Pbw1n-1、(Ki×En)Δt+Pbw2n-1: respectively a feedback model output item at the previous moment of the transmission side and a feedback model output item at the previous moment of the working side;
ΔTset(n): the temperature difference between the transmission side and the working side of the edge heater is fed back to control the target temperature deviation set value;
ΔTact(n): the temperature difference between the transmission side and the working side of the strip steel detected by a strip steel thermodetector at the outlet of the edge heater; en＝ΔTset(n)-ΔTact(n)。
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