CN111974816B - Method for calculating induction heating power set value of cold-rolled strip steel - Google Patents
Method for calculating induction heating power set value of cold-rolled strip steel Download PDFInfo
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Abstract
The invention aims to provide a method for calculating the set value of the induction heating power of cold-rolled strip steel, S1, calculating the set value of the initial induction heating power according to the initial heating efficiency factor and the relevant parameters of the induction heating power, and using the set value of the initial induction heating power to heat the strip steel in a trial manner; s2, judging whether the condition of correcting the heating efficiency factor is satisfied; s3, if the condition for correcting the heating efficiency factor is satisfied, correcting and calculating a new heating efficiency factor according to the deviation size and direction of the measured temperature and the set temperature of the strip steel at the outlet of the induction heater, and if the condition for correcting the heating efficiency factor is not satisfied, keeping the heating efficiency factor unchanged; s4, recalculating a new induction heating power set value according to the heating efficiency factor and the induction heating power related parameter obtained in the step S3 for heating the strip steel; and S5, repeating the steps S2 to S4 until the induction heating is stopped. The method improves the stability and rapidity of induction heating temperature control, and further improves the quality of cold-rolled strip steel products.
Description
Technical Field
The invention belongs to the technical field of cold rolling in metallurgical industry, and particularly relates to a method for calculating a set value of induction heating power of cold-rolled strip steel.
Background
The working principle of induction heating is that a group of induction coils are wound outside a heated metal workpiece, when alternating current with a certain frequency flows in the induction coils, alternating magnetic flux with the same frequency is generated, the alternating magnetic flux generates a certain induction potential in the metal workpiece, further induction current is generated, and joule heat is generated by the induction current, so that the metal workpiece is rapidly heated. The induction heating has the advantages of high heating speed, flexible and convenient power adjustment, non-contact heating, no pollution to the surface of a heating object, good temperature uniformity, environmental protection, energy conservation and the like which are incomparable with other traditional heating modes, and is gradually and widely applied to the production of cold-rolled strip steel in recent years.
Generally, the strip steel temperature at the outlet of the induction heater is the most important process control index for the induction heating of the cold-rolled strip steel, and the strip steel temperature at the outlet of the induction heater is indirectly realized by controlling the output heating power of an induction heating device. The existing cold-rolled steel strip induction heating outlet steel strip temperature control technology adopts the conventional PI regulation control, namely, the deviation of the outlet measured temperature and the outlet set temperature is subjected to proportional-integral operation, and the proportional-integral operation result is converted by a normalized scale and then is used as the power set value of an induction heater for controlling the output power of an induction heating device.
Although the existing method for calculating the induction heating power set value of the cold-rolled strip steel is classical and easy to realize by programming, due to the time delay and hysteresis of temperature detection, setting of a proper PI parameter is difficult, and short-time transition working conditions (such as unit acceleration, unit deceleration and weld joint passing) frequently occurring in the production process of a unit are taken as disturbance factors to easily cause the temperature of the strip steel at the outlet of an inductor to be over-harmonic and oscillatory, so that the stability and the rapidity of the measured temperature of the strip steel at the outlet of the inductor following the set temperature are influenced, and further the quality of the cold-rolled strip steel product is influenced.
Disclosure of Invention
The invention aims to provide a method for calculating the set value of the induction heating power of cold-rolled strip steel, which improves the stability and rapidity of induction heating temperature control and further improves the quality of cold-rolled strip steel products.
The technical scheme adopted by the invention is as follows:
a method for calculating a set value of induction heating power of cold-rolled strip steel comprises the following steps: s1, calculating an initial induction heating power set value according to the initial heating efficiency factor and the induction heating power related parameters, and using the initial induction heating power set value to heat the strip steel in a trial manner; s2, judging whether the condition of correcting the heating efficiency factor is satisfied; s3, if the condition for correcting the heating efficiency factor is satisfied, correcting and calculating a new heating efficiency factor according to the deviation size and direction of the measured temperature and the set temperature of the strip steel at the outlet of the induction heater, and if the condition for correcting the heating efficiency factor is not satisfied, keeping the heating efficiency factor unchanged; s4, recalculating a new induction heating power set value according to the heating efficiency factor and the induction heating power related parameter obtained in the step S3 for heating the strip steel; and S5, repeating the steps S2 to S4 until the induction heating is stopped.
Further, the relevant parameters of the induction heating power comprise unit speed, strip steel set temperature at an outlet of the induction heater, strip steel measured temperature at an inlet of the induction heater, strip steel width, strip steel thickness, strip steel density and strip steel specific heat capacity.
Furthermore, when the set value of the induction heating power is calculated according to the heating efficiency factor and the related parameters of the induction heating power, a formula is adopted
Wherein p is an induction heating power set value; w is the width of the strip steel; d is the thickness of the strip steel; v is the unit speed; rho is the density of the strip steel; c is the specific heat capacity of the strip steel; t is tspSetting the temperature of the strip steel at the outlet of the induction heater; t is tpv1Measuring the temperature of the strip steel at the inlet of the induction heater; η is the heating efficiency factor at the current moment.
Further, in step S2, the condition for correcting the heating efficiency factor includes six sub-conditions, and a logical and operation is performed between the six sub-conditions, and if the result is a logical true, the condition for correcting the heating efficiency factor is satisfied; the six sub-conditions are that the absolute value of the deviation between the set value and the measured value of the induction heating power is smaller than a power deviation dead zone, the absolute value of the deviation between the measured temperature and the set temperature of the strip steel at the outlet of the induction heater is larger than a temperature deviation dead zone, the absolute value of the deviation between the measured temperature and the set temperature of the strip steel at the outlet of the induction heater is smaller than a large temperature deviation threshold, the unit is not in an acceleration state, the unit is not in a deceleration state, and the welding seam is not in the induction heater.
Further, in step S3, the principle of calculating the new heating efficiency factor by correction includes: when the measured temperature of the strip steel at the outlet of the induction heater is lower than the set temperature of the strip steel at the outlet of the induction heater, reducing the correction heating efficiency factor so as to increase the set value of the induction heating power; when the measured temperature of the strip steel at the outlet of the induction heater is higher than the set temperature of the strip steel at the outlet of the induction heater, increasing a correction heating efficiency factor so as to reduce the set value of induction heating power; the larger the absolute value of the deviation between the measured temperature of the strip steel at the outlet of the induction heater and the set temperature of the strip steel at the outlet of the induction heater is, the more the heating efficiency factor increase and decrease correction amount is, and the faster the adjustment speed of the set value of the induction heating power is; the smaller the absolute value of the deviation between the measured temperature of the strip steel at the outlet of the induction heater and the set temperature of the strip steel at the outlet of the induction heater is, the less the heating efficiency factor increase/decrease correction amount is, and the slower the adjustment speed of the set value of the induction heating power is.
Further, the formula for correcting and calculating the new heating efficiency factor is
In the formula, eta is a heating efficiency factor at the current moment; eta is the heating efficiency factor at the previous sampling moment; delta t is the measured temperature t of the strip steel at the outlet of the induction heaterpv2And the set temperature t of the strip steel at the outlet of the induction heaterspAbsolute value of deviation of (a); Δ η is the heating efficiency factor increment; c is a large temperature deviation correction coefficient, b is a medium temperature deviation correction coefficient, a is a small temperature deviation correction coefficient, and satisfies 0<a<b<c；Tdev_maxLarge temperature deviation threshold, Tdev_midIs a medium temperature deviation threshold, Tdev_minFor small temperature deviation threshold, Tdev_dbIs a temperature deviation dead zone and satisfies 0<Tdev_db<Tdev_min<Tdev_mid<Tdev_max。
Furthermore, the production units adopted by the cold-rolled strip steel comprise an acid rolling unit, a pickling unit, a continuous annealing unit, a color coating unit, a galvanizing unit, a tinning unit and a recoiling unit.
Further, the control system applicable to the method for calculating the set value of the induction heating power of the cold-rolled strip steel comprises a PLC, a DCS, an industrial personal computer, a single chip microcomputer and a DSP.
The invention has the beneficial effects that:
the method can ensure that the deviation between the measured temperature and the set temperature of the strip steel at the outlet of the induction heater is always kept in the allowable deviation range, fully considers the fluctuation of the temperature at the outlet of the inductor caused by various process transition factors such as welding seam transition, unit acceleration, unit deceleration and the like, improves the stability and rapidity of induction heating temperature control, and further improves the quality of cold-rolled strip steel products.
The complicated PI parameter setting and debugging process is avoided, only a small amount of initial experience parameters need to be simply set, the subsequent power set value can be automatically adjusted and calculated according to the measured parameters and the initial parameters, the debugging time is shortened, and the maintenance workload after the commissioning is reduced.
The method can be realized on various control hardware platforms through software programming, can be used for an induction heating device of a newly-built cold rolling unit, can also be used for a newly-built induction heating device transformed from the existing cold rolling unit, and has strong applicability and realizability.
Drawings
FIG. 1 is a flow chart of a method for calculating a set value of induction heating power of cold-rolled strip steel in an embodiment of the invention.
FIG. 2 is a logic diagram for determining whether a condition for modifying a heating efficiency factor is satisfied in an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
A method for calculating a set value of induction heating power of cold-rolled strip steel as shown in figure 1 comprises the following steps:
s1, calculating an initial induction heating power set value according to the initial heating efficiency factor and the induction heating power related parameters, and using the initial induction heating power set value to heat the strip steel in a trial manner;
the induction heating power related parameters comprise unit speed, strip steel set temperature at an outlet of the induction heater, strip steel measured temperature at an inlet of the induction heater, strip steel width, strip steel thickness, strip steel density and strip steel specific heat capacity;
the initial set value of induction heating power is calculated by the formula
Wherein p is0Is an initial induction heating power set value; eta0Is an initial heating efficiency factor, is an empirical parameter, and has a value range of 0.5-1.4, wherein η is taken in the embodiment00.7; w is the strip width, d is the strip thickness, v is the unit speed, tpv1The temperature of the strip steel at the inlet of the induction heater can be measured directly; rho is the density of the strip steel, C is the specific heat capacity of the strip steel, and the two parameters are constants determined by the material characteristics of the strip steel; t is tspThe set temperature of the strip steel at the outlet of the induction heater is determined by the operation requirement of the strip steel production process.
S2, judging whether the condition of correcting the heating efficiency factor is satisfied;
as shown in fig. 2, the condition for correcting the heating efficiency factor includes six sub-conditions, and a logical and operation is performed between the six sub-conditions, and if the result is a logical true, the condition for correcting the heating efficiency factor is satisfied; the six sub-conditions are that the absolute value of the deviation between the set value and the measured value of the induction heating power is smaller than a power deviation dead zone, the absolute value of the deviation between the measured temperature and the set temperature of the strip steel at the outlet of the induction heater is larger than a temperature deviation dead zone, the absolute value of the deviation between the measured temperature and the set temperature of the strip steel at the outlet of the induction heater is smaller than a large temperature deviation threshold, the unit is not in an acceleration state, the unit is not in a deceleration state, and the welding seam is not in the induction heater.
S3, in the first case, if the condition of correcting the heating efficiency factor is satisfied, correcting and calculating a new heating efficiency factor according to the deviation size and direction of the measured temperature and the set temperature of the strip steel at the outlet of the induction heater;
the formula for correcting and calculating the new heating efficiency factor is
In the formula, eta is a heating efficiency factor at the current sampling moment; eta is the heating efficiency factor at the previous sampling moment; delta t is the measured temperature t of the strip steel at the outlet of the induction heaterpv2And the set temperature t of the strip steel at the outlet of the induction heaterspAbsolute value of deviation of (a); delta eta is the increment of the heating efficiency factor, is an empirical constant, and has a value range of 0.1-0.3, which is 0.1 in the embodiment; c is a large temperature deviation correction coefficient, which is an empirical constant, in this example, 5.0; b is the middle temperature deviation correction coefficient, which is an empirical constant, in this exampleTaking out 2.0; a is a small temperature deviation correction coefficient, which is an empirical constant, and in this embodiment, 1.0 is taken; t isdev_maxThe large temperature deviation threshold is an empirical constant, and is taken as 30.0 ℃ in the embodiment; t isdev_midThe medium temperature deviation threshold is an empirical constant, and is 10.0 ℃ in the embodiment; t isdev_minThe threshold value of small temperature deviation is an empirical constant, and is taken as 5.0 ℃ in the embodiment; t isdev_dbThe temperature deviation dead zone is an empirical constant, and is taken as 1.0 ℃ in the embodiment; and satisfy 0<a<b<c and 0<Tdev_db<Tdev_min<Tdev_mid<Tdev_max；
The principle of the heating efficiency factor correction calculation is as follows: when the measured temperature of the strip steel at the outlet of the induction heater is lower than the set temperature of the strip steel at the outlet of the induction heater, reducing the correction heating efficiency factor so as to increase the set value of the induction heating power; when the measured temperature of the strip steel at the outlet of the induction heater is higher than the set temperature of the strip steel at the outlet of the induction heater, increasing a correction heating efficiency factor so as to reduce the set value of induction heating power; the larger the absolute value of the deviation between the measured temperature of the strip steel at the outlet of the induction heater and the set temperature of the strip steel at the outlet of the induction heater is, the more the heating efficiency factor increase and decrease correction amount is, and the faster the adjustment speed of the set value of the induction heating power is; the smaller the absolute value of the deviation between the measured temperature of the strip steel at the outlet of the induction heater and the set temperature of the strip steel at the outlet of the induction heater is, the less the heating efficiency factor increase/decrease correction amount is, and the slower the adjustment speed of the set value of the induction heating power is.
In the second case, if the condition for correcting the heating efficiency factor is not satisfied, the heating efficiency factor is kept unchanged.
S4, recalculating new induction heating power set value according to the heating efficiency factor and induction heating power related parameter obtained in the step S3 for heating the strip steel by adopting a formula
Wherein p' is a new set value of induction heating power; w is the width of the strip steel; d is the thickness of the strip steel; v is the unit speed; rho is strip steelDensity; c is the specific heat capacity of the strip steel; t is tspSetting the temperature of the strip steel at the outlet of the induction heater; t is tpv1Measuring the temperature of the strip steel at the inlet of the induction heater; η' is the heating efficiency factor at the current sampling instant.
And S5, repeating the steps S2 to S4 until the induction heating is stopped.
The production unit adopted by the cold-rolled strip steel comprises an acid rolling unit, a pickling unit, a continuous annealing unit, a color coating unit, a galvanizing unit, a tinning unit, a recoiling unit and the like, and in the embodiment, the cold-rolled strip steel production process unit is a push-pull pickling unit.
The control system applicable to the method for calculating the set value of the induction heating power of the cold-rolled strip steel comprises a PLC (programmable logic controller), a DCS (distributed control system), an industrial personal computer, a single chip microcomputer, a DSP (digital signal processor) and the like, the method for calculating the set value of the induction heating power of the cold-rolled strip steel can be realized by programming on hardware platforms such as the PLC, the DCS, the industrial personal computer, the single chip microcomputer, the DSP and the like, and in the embodiment, the method is realized by programming through LAD language software in BomStep 7 programming software on Siemens S7-1500 PLC.
The method can ensure that the deviation between the measured temperature and the set temperature of the strip steel at the outlet of the induction heater is always kept in the allowable deviation range, fully considers the fluctuation of the temperature at the outlet of the inductor caused by various process transition factors such as welding seam transition, unit acceleration, unit deceleration and the like, improves the stability and rapidity of induction heating temperature control, and further improves the quality of cold-rolled strip steel products. The complicated PI parameter setting and debugging process is avoided, only a small amount of initial experience parameters need to be simply set, the subsequent power set value can be automatically adjusted and calculated according to the measured parameters and the initial parameters, the debugging time is shortened, and the maintenance workload after the commissioning is reduced. The method can be realized on various control hardware platforms through software programming, can be used for an induction heating device of a newly-built cold rolling unit, can also be used for a newly-built induction heating device transformed from the existing cold rolling unit, and has strong applicability and realizability.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (7)
1. A method for calculating the set value of the induction heating power of cold-rolled strip steel is characterized by comprising the following steps: the method comprises the following steps: s1, calculating an initial induction heating power set value according to the initial heating efficiency factor and the induction heating power related parameters, and using the initial induction heating power set value to heat the strip steel in a trial manner; s2, judging whether the condition of correcting the heating efficiency factor is met; s3, if the condition for correcting the heating efficiency factor is satisfied, correcting and calculating a new heating efficiency factor according to the deviation size and direction of the measured temperature and the set temperature of the strip steel at the outlet of the induction heater, and if the condition for correcting the heating efficiency factor is not satisfied, keeping the heating efficiency factor unchanged; s4, recalculating a new induction heating power set value according to the heating efficiency factor and the induction heating power related parameter obtained in the step S3 for heating the strip steel; s5, repeating the steps S2 to S4 until the induction heating is stopped;
in step S2, the condition for correcting the heating efficiency factor includes six sub-conditions, and a logical and operation is performed between the six sub-conditions, and if the result is a logical true, the condition for correcting the heating efficiency factor is satisfied; the six sub-conditions are that the absolute value of the deviation between the set value and the measured value of the induction heating power is smaller than a power deviation dead zone, the absolute value of the deviation between the measured temperature and the set temperature of the strip steel at the outlet of the induction heater is larger than a temperature deviation dead zone, the absolute value of the deviation between the measured temperature and the set temperature of the strip steel at the outlet of the induction heater is smaller than a large temperature deviation threshold, the unit is not in an acceleration state, the unit is not in a deceleration state, and the welding seam is not in the induction heater.
2. The method for calculating the set value of the induction heating power of the cold-rolled steel strip as set forth in claim 1, wherein: the related parameters of the induction heating power comprise unit speed, strip steel set temperature at the outlet of the induction heater, strip steel measured temperature at the inlet of the induction heater, strip steel width, strip steel thickness, strip steel density and strip steel specific heat capacity.
3. The method for calculating the set value of the induction heating power of the cold-rolled steel strip as set forth in claim 2, wherein: when the induction heating power set value is calculated according to the heating efficiency factor and the induction heating power related parameters, a formula is adopted
Wherein p is an induction heating power set value; w is the width of the strip steel; d is the thickness of the strip steel; v is the unit speed; rho is the density of the strip steel; c is the specific heat capacity of the strip steel; t is tspSetting the temperature of the strip steel at the outlet of the induction heater; t is tpv1Measuring the temperature of the strip steel at the inlet of the induction heater; η is the heating efficiency factor at the current moment.
4. The method for calculating the set value of the induction heating power of the cold-rolled steel strip as set forth in claim 1, wherein: in step S3, the principle of correcting and calculating the new heating efficiency factor includes that the correction heating efficiency factor is decreased when the measured temperature of the strip steel at the outlet of the induction heater is lower than the set temperature of the strip steel at the outlet of the induction heater, so as to increase the set value of the induction heating power; when the measured temperature of the strip steel at the outlet of the induction heater is higher than the set temperature of the strip steel at the outlet of the induction heater, increasing a correction heating efficiency factor so as to reduce the set value of induction heating power; the larger the absolute value of the deviation between the measured temperature of the strip steel at the outlet of the induction heater and the set temperature of the strip steel at the outlet of the induction heater is, the more the heating efficiency factor increase and decrease correction amount is, and the faster the adjustment speed of the set value of the induction heating power is; the smaller the absolute value of the deviation between the measured temperature of the strip steel at the outlet of the induction heater and the set temperature of the strip steel at the outlet of the induction heater is, the smaller the heating efficiency factor increase and decrease correction amount is, and the lower the adjustment speed of the induction heating power set value is.
5. The method for calculating the set value of the induction heating power of the cold-rolled steel strip as set forth in claim 4, wherein: the formula for correcting and calculating the new heating efficiency factor is
In the formula, eta' is a heating efficiency factor at the current moment; eta is the heating efficiency factor at the previous sampling moment; delta t is the measured temperature t of the strip steel at the outlet of the induction heaterpv2And the set temperature t of the strip steel at the outlet of the induction heaterspAbsolute value of deviation of (a); Δ η is the heating efficiency factor increment; c is a large temperature deviation correction coefficient, b is a medium temperature deviation correction coefficient, a is a small temperature deviation correction coefficient, and satisfies 0<a<b<c；Tdev_maxLarge temperature deviation threshold, Tdev_midIs a medium temperature deviation threshold, Tdev_minFor small temperature deviation threshold, Tdev_dbIs a temperature deviation dead zone and satisfies 0<Tdev_db<Tdev_min<Tdev_mid<Tdev_max。
6. The method for calculating the set value of the induction heating power of the cold-rolled steel strip as set forth in claim 1, wherein: the production units adopted by the cold-rolled strip steel comprise an acid rolling unit, an acid washing unit, a continuous annealing unit, a color coating unit, a galvanizing unit, a tinning unit or a rewinding unit.
7. The method for calculating the set value of the induction heating power of the cold-rolled steel strip as set forth in claim 1, wherein: the control system applicable to the method for calculating the set value of the induction heating power of the cold-rolled strip steel comprises a PLC, a DCS, an industrial personal computer, a single chip microcomputer and a DSP.
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