CN114480831B - Automatic control method for annealing speed of strip steel - Google Patents
Automatic control method for annealing speed of strip steel Download PDFInfo
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- CN114480831B CN114480831B CN202210136831.6A CN202210136831A CN114480831B CN 114480831 B CN114480831 B CN 114480831B CN 202210136831 A CN202210136831 A CN 202210136831A CN 114480831 B CN114480831 B CN 114480831B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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Abstract
The invention relates to the technical field of continuous heat treatment of strip steel, and discloses an automatic control method of annealing speed of strip steel, which comprises the following steps: the annealing speed of the unit strip steel is automatically controlled by a program and is controlled by the maximum production capacity of the unit by default, so that the maximization of the unit yield is realized, the maximum production capacity is characterized by a target TV value, the target TV value is the product of the thickness of the incoming strip steel and the maximum speed of the unit operation of the strip steel with the thickness allowed by the unit capacity, and the annealing speed automatic control program of the unit strip steel divides the target TV value by the thickness of the strip steel at the inlet of the annealing furnace to obtain a target V of the annealing speed of the unit strip steel aim The method comprises the steps of carrying out a first treatment on the surface of the The invention realizes the automatic control of the unit speed, ensures that the strip steel annealing can realize unmanned production, can exert the limit capability of the unit when the unit has abnormal limit, ensures that the unit is produced under the real-time maximum hour output, gives consideration to the process control, meets the annealing process requirement, leaves a certain margin and avoids the inconsistent annealing process.
Description
Technical Field
The invention relates to the technical field of continuous heat treatment of strip steel, in particular to an automatic control method for annealing speed of strip steel.
Background
In order to improve the formability of a strip steel, the strip steel obtained by cold rolling is generally annealed. The broad sense annealing treatment includes a continuous annealing treatment and a cap annealing treatment. The patent only relates to continuous annealing treatment of the strip steel, and related units comprise a strip steel continuous annealing unit, a strip steel continuous hot dip pure zinc unit, a strip steel continuous alloying hot dip galvanizing unit, a strip steel continuous hot dip low aluminum zinc aluminum magnesium unit, a strip steel continuous hot dip middle aluminum zinc aluminum magnesium unit, a strip steel continuous hot dip high aluminum zinc aluminum magnesium unit, a strip steel continuous hot dip aluminum zinc silicon unit, a strip steel continuous hot dip aluminum silicon unit and the like.
For continuous annealing treatment of strip steel, the unit put into production in recent years basically realizes automatic control of furnace temperature or automatic control of strip steel temperature, and can basically realize unmanned annealing temperature control. For example, chinese patent CN201010521573.0 discloses an automatic control method for the furnace temperature of an open flame heating furnace, which adopts a multi-feedforward fuzzy control system to realize automatic control of the furnace temperature in steady state and unsteady state. Chinese patent CN201710432654.5 discloses a dynamic sectional control method for annealing temperature of tin-plated product, which applies the concept of "dynamic sectional" control to the existing continuous annealing automatic control system, dynamically sets the strip steel temperature and the heating temperature in the furnace in sections along the length direction of the strip steel, and applies a high-efficiency numerical calculation method, wherein the "genetic factor" of each section of temperature control is used in the feedforward control of the strip steel, and the power of the radiation tube is dynamically adjusted by fine adjustment of the feedforward calculation result to adjust the surface temperature of the strip steel, so that the control of the strip steel temperature can be more accurate. Chinese patent CN201610007364.1 discloses an automatic control system and control method for the temperature of the combustion section of a vertical annealing furnace, which adjusts the actual combustion air-fuel ratio in the ON/OFF control mode to realize the optimal control of the strip steel temperature. Chinese patent CN201611042024.9 discloses a method and system for controlling temperature in annealing furnace, which solves the problem of switching time point of temperature control in different sections of annealing furnace. Chinese patent CN200610024477.9 discloses a method for transition of strip steel temperature process, which can realize automatic control of the target temperature transition of strip steel greater than 20 ℃.
The method is characterized in that the strip steel temperature is suitable for the speed of the unit to be automatically controlled, the unit speed is relatively mature, and the unit speed is basically manually controlled by an operator according to experience, namely the running speed of the strip steel of the unit of the existing unit put into operation is basically not automatically controlled. Chinese patent CN201110333416.1 discloses an online comprehensive control method for a hot dip galvanizing continuous annealing furnace, wherein the online detection module is used for collecting strip steel operation information, including strip steel speed, processing technique, coil code and strip steel specification; according to the collected strip steel operation information, main parameters are called through an expert database, and the speed model, the heat transfer model and the strip temperature feedback model are combined to complete heat load setting and speed setting, so that a primary control system is automatically controlled according to the set parameters, and the on-line production control of the annealing furnace is realized. The method is used for automatically controlling the unit speed, but mainly considers the limitation of heating sections of different process grades (equivalent to steel grades) and the like, and does not fully consider various abnormal limiting conditions such as abnormal speed limit of a fan, exceeding of the temperature of cooling water of a WQ tank and the like. Chinese patent CN201410841003.8 discloses a method for setting and optimizing process parameters in a continuous annealing unit, which considers some constraint conditions in the online dynamic optimizing stage of the process parameters in the continuous annealing unit, and rapidly obtains new optimal process parameter setting values when the state changes, so as to ensure that the continuous annealing unit always operates under the optimal process parameters in the dynamic production process. But the abnormal conditions such as deflection of the strip steel, buckling of the strip steel in the furnace, exceeding of the water cooling power of the WQ groove and the like are not considered in the method.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides an automatic control method for the annealing speed of strip steel, which solves the problems in the prior art.
(II) technical scheme
In order to achieve the above purpose, the present invention provides the following technical solutions: an automatic control method for the annealing speed of strip steel comprises the following steps: the annealing speed of the unit strip steel is automatically controlled by a program and is controlled by the maximum production capacity of the unit by default, so that the maximization of the unit yield is realized, the maximum production capacity is characterized by a target TV value, the target TV value is the product of the thickness of the incoming strip steel and the maximum speed of the unit operation of the strip steel with the thickness allowed by the unit capacity, and the annealing speed automatic control program of the unit strip steel divides the target TV value by the thickness of the strip steel at the inlet of the annealing furnace to obtain a target V of the annealing speed of the unit strip steel aim The annealing speed target value V of the unit strip steel obtained by the calculation is firstly calculated by the automatic control program of the annealing speed of the unit strip steel aim With maximum speed value V of unit max Comparing, and taking small value as actual control target value V of unit running speed act-aim Then using the actual control target value V of the running speed of the unit act-aim And the current actual speed value V of the main command roller strip steel of the unit act Comparing, if the current actual speed value V of the main roller strip steel of the unit act Actual control target value V of unit running speed act-aim If the strip steel is inconsistent, the strip steel of the unit is withdrawnThe fire speed automatic control program adjusts the running speed of the unit to enable the main roller strip steel of the unit to have the current actual speed value V act Gradually approaches to actual control target value V of unit running speed act-aim In the speed regulation process, the unit adopts the lifting speed slope of normal operation to lift, but the automatic control program of the annealing speed of the strip steel of the unit can control the maximum value DeltaV of the primary allowable lifting speed max And a minimum steady operation time t after each speed increase and decrease min Preset limit is carried out, if the current actual speed value V of the main roller strip steel of the unit act Actual control target value V of unit running speed act-aim The absolute value of the difference is greater than the maximum value DeltaV of the allowable lifting speed at a time max The unit speed is adjusted (increased or decreased) by DeltaV only at a time max And the automatic control program of the annealing speed of the strip steel of the unit can automatically count after each speed rise and fall, when the counted time t is longer than the lowest stable running time t min The next adjustment is carried out by the post-procedure until the current actual speed value V of the main roller strip steel of the final unit act Actual control target value V of unit running speed act-aim The absolute value of the difference is less than or equal to the maximum value DeltaV of the allowable lifting speed at a time max The automatic control program of the annealing speed of the strip steel of the unit adjusts the unit speed to the actual control target value V of the running speed of the unit in one step at last act-aim In addition, a set target TV value input interface is arranged on an operation picture of an annealing furnace basic automation (L1) system, the target TV value is from a set value on the input interface, and the set value is input by a set operator according to steel types, annealing curves and set states and operation experience.
Preferably, the set value on the set target TV value input interface is not manually input, but the set strip steel annealing speed automatic control program is a value obtained by looking up a table from a static table of an annealing temperature control process automation (L2) system according to the produced steel grade and an annealing curve, and the numerical value in the static table is dynamically maintained by a set process technician.
Preferably, the set value on the set target TV value input interface is not manually input, but is calculated by a set annealing speed automatic control program according to steel types, specifications, set equipment capacity (including heating capacity and cooling capacity) and an annealing curve through a mathematical model.
Preferably, the automatic control program for the annealing speed of the strip steel of the unit controls the speed of the unit by taking into consideration the abnormal temporary limiting condition of the unit, in addition to the target TV value, the abnormal temporary limiting condition of the unit includes: the maximum rotational speed power limitation of the RCS fan, if the RCS fan shaft seal is abnormal, the strip steel is easy to generate oxidation color when the fan rotational speed is higher, the maximum rotational speed power of the RCS fan is limited manually at the moment, under the condition of the temporary limitation, the cooling capacity of the RCS fan is limited, the unit is likely to be unable to produce under a normal target TV value, the automatic control program of the annealing speed of the unit strip steel increases the judgment that whether the power of the RCS fan reaches the maximum rotational speed power limitation value and whether the temperature of the RCS outlet strip steel exceeds the allowable temperature upper limit value, if the power of the RCS fan reaches the maximum rotational speed power limitation value and the temperature of the RCS outlet strip steel exceeds the allowable temperature upper limit value (which is equivalent to the occurrence of the temperature discrepancy of the RCS outlet strip steel), the automatic control program of the annealing speed of the unit strip steel automatically reduces the speed, and the automatic feedback adjustment control of the unit speed of the unit is carried out by a preset lifting speed limit value delta V when the annealing speed of the unit strip steel is controlled by the automatic speed of the unit under the preset lifting speed limit value of the RCS outlet strip steel temperature of the target value of the RCS outlet strip steel of the temperature of the RCS under the condition limit Adjusting;
the unit abnormality temporary limiting condition further includes: and when the rotating speed of the SCS fan reaches the maximum rotating speed power limit value but the temperature of the strip steel at the outlet of the SCS exceeds the allowable upper limit value, the automatic control program of the annealing speed of the strip steel of the unit controls the unit to automatically slow down, and the automatic feedback regulation control of the unit speed is carried out according to the target value of the temperature of the strip steel at the outlet of the SCS, which is minus 5 ℃. In this case, the automatic control program of the annealing speed of the strip steel of the unit controls the automatic deceleration or ascent speed of the unit to limit the amplitude DeltaV at the preset ascent speed limit Make adjustments if RCS fan is the mostThe high rotation speed power limit and the SCS fan maximum rotation speed power limit exist simultaneously, and the automatic control program of the annealing speed of the strip steel of the unit is controlled according to the low speed of the two limiting conditions, namely, the temperatures of RCS and SCS meet the process requirements, and a margin of 5 ℃ is reserved;
the unit abnormality temporary limiting condition further includes: CPC deviation amount, when the actual deviation amount L of CPC is greater than the preset upper limit value L of the deceleration deviation amount H When the annealing speed automatic control program of the unit strip steel directly and automatically reduces the speed, the temperature is not considered, but the strip steel temperature control program is suitable for the unit speed to automatically control, and simultaneously, the annealing speed automatic control program of the unit strip steel carries out picture text alarm and sound alarm, reduces the speed according to the quick stop speed reduction rate of the unit, and the one-time speed reduction amplitude is according to the set delta V quick When the time exceeds the preset time, if the actual CPC running deviation L is still larger than the preset upper limit value L of the running deviation of the speed reduction H The deceleration operation is carried out again, and the operation is carried out circularly until the minimum operation speed allowed by the unit is reduced to be operated at the minimum operation speed for the last time, when the actual running deviation L of CPC is greater than the upper limit value L of the machine halt HH When the annealing speed of the strip steel of the unit is controlled by the automatic control program, the annealing speed of the strip steel of the unit is controlled by the automatic stop and temperature reduction speed, if the actual deviation L of CPC is not greater than the stop upper limit value L HH And back to the allowable up-running deviation value L normal When the duration exceeds the preset time, the automatic control program of the annealing speed of the strip steel of the unit carries out automatic speed-up control;
the unit abnormality temporary limiting condition further includes: WQ tank cooling water temperature T WQ When the temperature T of the cooling water of the WQ tank WQ Above the upper temperature T of deceleration WQmax At the temperature of minus 1 ℃, the automatic control program of the annealing speed of the strip steel of the unit automatically reduces the speed, simultaneously prompts and alarms, and the temperature T is the upper limit temperature of the water temperature of the WQ tank WQmax -2 ℃ automatically controlling the machine set speed, in which case the machine set automatic deceleration or acceleration is controlled by the machine set strip annealing speed automatic control program to also at the preset acceleration or decelerationClipping DeltaV limit Adjusting;
the unit abnormality temporary limiting condition further includes: when the water conductivity of the WQ tank cooling water is higher than the upper limit of the water conductivity of the WQ tank cooling water by-1 mu s/cm, the automatic control program of the annealing speed of the strip steel of the unit automatically reduces the speed, simultaneously carries out prompt alarm, and automatically controls the speed of the unit according to the upper limit of the water conductivity of the WQ tank cooling water by-2 mu s/cm, in this case, the automatic control program of the annealing speed of the strip steel of the unit controls the automatic speed reduction or the lifting speed of the unit to also limit the lifting speed by a preset lifting speed delta V limit And adjusting.
Preferably, the conductivity value of the WQ tank cooling water adopted by the control is not an instantaneous value, but an average value calculated by integration in a period of time is taken, and abnormal fluctuation of unit speed control caused by instantaneous fluctuation of the WQ tank cooling water conductivity is avoided.
Preferably, when two or more restrictions are present at the same time, the unit speed is automatically controlled with all restrictions met and with a suitable margin, i.e. the most severe condition is met-the unit is operated with the greatest restriction amplitude.
Preferably, the unit is provided with a broken belt alarm signal, and when the automatic control program of the annealing speed of the strip steel of the unit receives the broken belt alarm signal, the automatic control program of the annealing speed of the strip steel of the unit directly carries out automatic shutdown cooling according to the rapid shutdown speed reduction rate.
Preferably, the machine set is also provided with a strip steel buckling vision automatic identification system, when the strip steel buckling vision automatic identification system identifies that buckling occurs on the strip steel, the strip steel buckling vision automatic identification system sends out picture reminding and sound alarming, an operator changes the machine set speed control from program automatic control to manual control, and the operator carries out machine set speed adjustment and strip steel temperature adjustment operation.
Preferably, when the strip steel buckling vision automatic identification system identifies that buckling occurs on the strip steel, the strip steel buckling vision automatic identification system automatically controls the buckling signals and the buckling type (hot section buckling and cold section buckling) generator set strip steel annealing speed, the set strip steel annealing speed automatic control program starts automatic adjustment of the set strip steel according to the buckling type after receiving the buckling signals, and the corresponding buckling temperature adjustment control is automatically performed by matching with the set strip steel temperature automatic control program, and the corresponding tension adjustment control is automatically performed by the set tension automatic control program.
(III) beneficial effects
The invention provides an automatic control method for strip steel annealing speed, which has the following beneficial effects:
(1) The invention realizes the automatic control of the unit speed, and can realize unmanned production by annealing the strip steel.
(2) The invention can exert the limit capacity of the unit when the unit has abnormal limit, and the unit can be produced under the real-time maximum hour output.
(3) The invention gives consideration to process control, meets the requirement of the annealing process, and leaves a certain margin to avoid inconsistent annealing process.
(4) The invention takes into account the anomalies such as deviation, buckling, ultrahigh water temperature of the WQ cooling water, abnormally high WQ conductivity and the like to automatically control, and finally realizes 'one-key annealing', namely one-key shutdown except one-key startup and shutdown of startup, and the annealing speed is not required to be adjusted by human intervention in the period.
Drawings
FIG. 1 is a schematic diagram of a production unit for a continuous hot dip galvannealed strip product according to example 1 of the present invention.
In the figure: 11. strip steel; 12. a cleaning section; 13. a substrate annealing treatment section; 14. a furnace nose; 15. a zinc pot; 16. an air knife; 17. alloying the heating section; 18. alloying and homogenizing the heat section; 19. an alloying cooling section; 20. a common jet cooling section; 21. a final water cooling section; 22. leveling; 31. a direct-fired combustion exhaust gas preheating section; 32. a direct-fire heating section; 33. a radiant tube heating section; 34. a radiant tube soaking section; 35. a slow cooling section; 36. a rapid cooling section; 37. equalizing section.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The steel strip is subjected to steel making, continuous casting, hot rolling, pickling and cold continuous rolling and then enters a steel strip continuous alloying hot galvanizing unit shown in figure 1 for heat treatment and hot galvanizing and coating alloying annealing, and the unit is designed to have a maximum running speed V max =150 mpm, design minimum steady running speed V min The minimum allowable running speed is 11mpm, the thickness of the strip steel is 0.5-2.0mm, and the normal acceleration and deceleration speed of the unit is +/-0.1 m/s 2 The speed of the rapid stopping speed of the unit is-0.3 m/s 2 The speed of the rapid stop of the unit is-0.6 m/s 2 The machine set takes a second roller of 5BR (tensioning roller in front of the zinc pot) as a main command roller, namely the linear speed of the second roller is the machine set speed. The annealing furnace of the unit comprises a direct fire heating section 32, a radiant tube heating section 33, a radiant tube soaking section 34, a slow cooling section 35, a rapid cooling section 36, an equalizing section 37 and a furnace nose 14, and also comprises an alloying heating section 17, an alloying soaking section 18, an alloying cooling section 19, a common air-jet cooling section 20 and a final water cooling section 21 because the strip steel is subjected to cladding alloying annealing. The bottleneck link of the unit before the unit is transformed is in the alloying cooling section 19, and the unit speed is limited by the cooling capacity of the alloying cooling section 19 due to the insufficient cooling capacity, namely, the capacities of the direct-fire heating section 32, the radiant tube heating section 33, the radiant tube soaking section 34, the slow cooling section 35 and the fast cooling section 36 are fully rich, and the further speed increasing of the unit is not influenced. However, different steel grades at least require the alloying cooling section 19 to cool the strip below 350 ℃, and the original alloying cooling section 19 reaches 350 ℃ when the set TV value (thickness of strip) is 120 mm-mpm, which cannot further improve the productivity. The unit reforms the alloying cooling section 19, changes the jet cooling into aerosol cooling, and the cooling capacity after reforming is no longer the bottleneck of unit production performance. But limited by the plant height and alloying heating capacity, the alloying soaking section 18 becomes again the bottleneck of the unit. Improvement ofBefore manufacturing, an operator manually inputs a target TV value into 120 on an operation picture of an annealing furnace basic automation (L1) system, the annealing speed of the strip steel of the unit is automatically controlled by a program, and the automatic control is performed by defaulting to the TV value of 120, so that the maximum unit yield is realized. To better illustrate the speed control of the present embodiment, specific examples are as follows: the thickness of the current strip steel is 1.2mm, the running speed of the unit is 100mpm, the thickness of the backward strip steel is sequentially 1.0mm, 0.8mm, 0.6mm and 0.5mm, and for the current coil, 120/1.2=100 is used for the automatic control program of the annealing speed of the unit strip steel, so that V is obtained aim =100mpm，V act-aim =min{V aim ，V max } = min {100, 150} = 100, the current actual speed value V act =100 mpm, i.e. V act =V act-aim The speed of the unit does not need to be regulated. The thickness of the next coiled steel is 1.0mm, and the annealing speed of the strip steel of the unit is automatically controlled by a program of 120/1.0=120 to obtain V aim =120mpm，V act-aim =min{V aim ，V max } = min {120, 150} = 120, current actual speed value V act =100 mpm, i.e. V act ＜V act-aim Therefore, when the strip steel with the thickness of 1.0mm is produced, the unit speed needs to be increased. In the embodiment, the automatic control program of the annealing speed of the strip steel of the unit is used for controlling the maximum value DeltaV of the one-time allowable lifting speed max The preset limit is 5mpm, and the minimum stable operation time t is after each speed rise and fall min The preset limit is 30 seconds, at which time V act-aim -V act =20mpm＞ΔV max Therefore, the automatic control program of the annealing speed of the unit strip steel can be divided into 4 times, and the unit speed is increased to 120mpm every 30 seconds. The bottleneck of the unit is in the alloying cooling section 19, and the unit starts to speed up gradually when the strip steel strip head of 1.0mm in the back reaches the alloying cooling section 19. When the thickness of the backward strip steel is 0.8mm, 120/0.8=150 is used for the automatic control program of the annealing speed of the strip steel of the unit to obtain V aim =150mpm，V act-aim =min{V aim ，V max } = min {150, 150} = 150, current actual speed value V act =120 mpm, i.e. V act ＜V act-aim Therefore, when the strip steel with the thickness of 0.8mm is produced, the unit speed needs to be increased. And at this time V act-aim -V act =30mpm＞ΔV max Thus, it isThe automatic control program of the annealing speed of the unit strip steel can accelerate 6 times when the strip steel head of 0.8mm reaches the alloying cooling section 19, so that the unit speed is increased to 150mpm. When the thickness of the backward strip steel is 0.6mm, 120/0.6=200 is used for the automatic control program of the annealing speed of the strip steel of the unit to obtain V aim =200mpm，V act-aim =min{V aim ，V max } = min {200, 150} = 150, the current actual speed value V act =150 mpm, i.e. V act =V act-aim Therefore, when the strip steel with the thickness of 0.6mm is produced, the speed of the unit is maintained unchanged. When the thickness of the backward strip steel is 0.5mm, 120/0.5=240 is used by the automatic control program of the annealing speed of the strip steel of the unit to obtain V aim =240mpm，V act-aim =min{V aim ，V max } = min {240, 150} = 150, the current actual speed value V act =150 mpm, i.e. V act =V act-aim Therefore, when the strip steel with the thickness of 0.5mm is produced, the speed of the unit is maintained unchanged. It should be noted that if the strip steel is switched from thin to thick, considering that in order to enable the strip steel with thick specification to meet the requirement through the process of the alloying cooling section 19, that is, the strip steel can be cooled down, the speed of the tail of the forward coil needs to be reduced in advance, and the speed adjustment is completed when the head reaches the alloying cooling section 19, which is not repeated here. After the unit is reformed, the alloying cooling section 19 is not a unit capacity bottleneck any more, the unit bottleneck is changed into the alloying soaking section 18, the target TV value after the reformation is 150, an operator manually inputs and modifies the target TV value into 150 on an operation picture of an annealing furnace basic automation (L1) system, and the annealing speed of the strip steel of the unit is automatically controlled by a program. At this time, again with the initial conditions: the thickness of the current strip steel is 1.2mm, the running speed of the unit is 100mpm, the thicknesses of the backward strip steel are sequentially 1.0mm, 0.8mm, 0.6mm and 0.5mm, and for the current coil, 150/1.2=125 is used for the automatic control program of the annealing speed of the unit strip steel, so that V is obtained aim =125mpm，V act-aim =min{V aim ，V max } = min {125, 150} = 125, current actual speed value V act =100 mpm, i.e. V act ＜V act-aim Therefore, the automatic control program of the annealing speed of the strip steel of the unit controls the raising speed of the unit according to delta V max =5mpm，t min The same constraint of =30 secondsV at this time act-aim -V act =25mpm＞ΔV max The automatic control program of the annealing speed of the strip steel of the unit increases the unit speed to 125mpm at intervals of 30 seconds for 5 times. The thickness of the next coiled steel is 1.0mm, and the annealing speed of the unit strip steel is automatically controlled by a program of 150/1.0=150 to obtain V aim =150mpm，V act-aim =min{V aim ，V max } = min {150, 150} = 150, current actual speed value V act =125 mpm, i.e. V act ＜V act-aim Therefore, when the strip steel with the thickness of 1.0mm is produced, the unit speed needs to be increased. At this time V act-aim -V act =25mpm＞ΔV max The automatic control program of the annealing speed of the strip steel of the unit increases the unit speed to 125mpm at intervals of 30 seconds for 5 times. Because the bottleneck capacity of the unit is changed in the alloying soaking section 18, when the strip head of the strip steel with the diameter of 1.0mm reaches the alloying soaking section 18, the annealing speed automatic control program of the strip steel of the unit starts to rise. The thickness of the next coiled steel is 0.8mm, and the annealing speed of the unit strip steel is automatically controlled by a program of 150/0.8=187.5, so that V is obtained aim =187.5mpm，V act-aim =min{V aim ，V max -min {187.5, 150} =150, the current actual speed value V act =150 mpm, i.e. V act =V act-aim Therefore, when the strip steel with the thickness of 0.8mm is produced, the speed of the machine set is kept unchanged. Also, the machine set speed was maintained for both 0.6mm and 0.5mm post-production strip. It can be seen that for some thick products, the running speed of the unit can be increased, the overall yield of the unit can be increased, but for thin products, the improvement does not contribute to the productivity.
In this embodiment, the automatic control program of the annealing speed of the unit strip steel controls the unit speed by considering the abnormal temporary limiting condition of the unit, which is the maximum rotation speed power limit of the fan of the RCS fast cooling section 36, in addition to the target TV value. When the quick cooling section 36 is normal, the automatic control program of the annealing speed of the strip steel of the unit controls the speed of the unit according to the method. When the shaft seal of the RCS fast cooling section 36 fan is abnormal, the strip steel with higher fan rotating speed can generate oxidation color, and further the defect of poor binding force of a coating is generated, and the RCS fast cooling section 36 fan is required to be artificially used at the momentThe maximum rotational speed power is limited. For example, the maximum rotational speed power of the fan of the RCS fast cooling section 36 is temporarily limited to 70% from 96% in normal times in a certain period of time, and under the temporary limiting condition, the cooling capacity of the fan of the RCS fast cooling section 36 is limited, and the fan cannot be produced under the normal target TV value 150 after the unit is modified. At this time, the bottleneck of the unit becomes the RCS fast cooling section 36, the automatic control program of the strip annealing speed increases the judgment of whether the power of the RCS fan reaches the maximum rotation speed power limit value and whether the temperature of the RCS outlet strip exceeds the allowable temperature upper limit value, if the power of the RCS fan reaches the maximum rotation speed power limit value and the temperature of the RCS outlet strip exceeds the allowable temperature upper limit value (which is equivalent to the occurrence of the temperature discrepancy of the RCS outlet strip), the automatic control program of the strip annealing speed of the unit controls the unit to automatically reduce the speed, and takes the upper limit value of the temperature of the RCS outlet strip as the target value of the temperature of the RCS outlet strip to perform the automatic feedback regulation control of the unit speed, in which case, the automatic control program of the annealing speed of the unit controls the unit to automatically reduce or increase the speed to the preset speed reduction limit DeltaV limit And adjusting. Specific examples are as follows, the maximum rotational speed power of the fan of the RCS fast cooling section 36 is limited to 70%, and the automatic control program of the annealing speed of the strip steel of the unit of this embodiment controls the unit to automatically slow down or speed up to limit DeltaV at a preset speed down limit =1mpm, 1.5mm thick strip is produced, the RCS rapid cooling outlet strip temperature requires 480+ -20deg.C, the current running speed of the machine set is V act The unit TV value=135 mm·mpm, which is 90mpm, is that the RCS outlet strip steel temperature has reached 505 ℃ and exceeded the process allowable upper limit value of 500 ℃ although the target TV value of 150 is not reached, so the unit strip steel annealing speed automatic control program decelerates the unit by 1mpm once until the RCS outlet strip steel temperature is reduced to about 500-5=495 ℃. In this embodiment, the system parameter DEAD BAND value (i.e. neglecting the non-adjustment range value) of the RCS outlet temperature control takes 2 ℃, i.e. the program considers that the RCS outlet temperature is adjusted in place and is not adjusted any more when the RCS outlet temperature is adjusted to 495±2 ℃. If the temperature of the RCS rapid cooling outlet strip steel of the next coil of strip steel with the same thickness specification is required to be 485+/-10 ℃, and the automatic control program of the annealing speed of the strip steel of the unit adjusts the speed of the unit by taking 495-5=490 ℃ as a target value according to the control logic.
In this embodiment, the unit abnormality temporary limiting condition further includes: CPC running deviation amount, and upper limit value L of running deviation amount H Presetting to 80%, stopping running deviation upper limit value L HH Presetting to 100%, and one-time deviation and speed reduction amplitude delta V quick Preset to 10mpm, and allow the rising run deflection L normal The value is preset to be 50%, when the actual running deviation L of CPC is greater than the preset upper limit value of the speed reduction running deviation by 80%, the automatic control program of the annealing speed of the strip steel of the unit directly and automatically reduces the speed, the temperature is not inconsistent, but the automatic control program of the strip steel temperature is applicable to the unit speed to automatically control, and simultaneously, the automatic control program of the annealing speed of the strip steel of the unit carries out picture text alarm and sound alarm, and the speed reduction speed of the unit is-0.3 m/s according to the quick stop speed reduction speed of the unit 2 The speed is reduced, and the speed is reduced by one-time speed reduction amplitude delta V according to the deviation quick When the time exceeds the preset time by 30 seconds, if the actual CPC deviation L is still greater than the preset upper limit value of the deviation amount of the deviation in the deceleration, the deceleration operation is performed again, and the operation is circulated until the last time is reduced to the minimum stable operation speed of 50mpm allowed by the unit, and when the actual CPC deviation L is greater than 100% of the upper limit value of the shutdown, the automatic control program of the annealing speed of the strip steel of the unit directly controls the automatic control program of the annealing speed of the strip steel of the unit according to the rapid stop deceleration speed of-0.6 m/s 2 And (3) automatically stopping the machine to cool down, if the actual running deviation L of CPC is not greater than 100% of the upper limit value of the machine and returns to the allowable rising running deviation below 50%, and if the duration exceeds the preset time for 30 seconds, automatically controlling the rising speed of the annealing speed of the strip steel of the unit by an automatic control program until the allowable speed of the program reaches the upper limit value.
In addition, the machine set of the embodiment is provided with a broken belt detector and is provided with a broken belt alarm signal, when the broken belt detector detects broken belt of the strip steel or tension of the machine set is lost, the broken belt alarm signal is sent out, and when the automatic control program of the annealing speed of the strip steel of the machine set receives the broken belt alarm signal, the automatic control program of the annealing speed of the strip steel of the machine set directly carries out automatic shutdown cooling according to the rapid stop deceleration rate.
Example 2
The strip steel enters a strip steel continuous annealing unit for annealing after steelmaking, continuous casting, hot rolling and pickling and cold continuous rolling, and the unit designs the maximum running speed V max Design minimum steady operation speed V =300 mpm min =40 mpm, the minimum allowable running speed is designed to be 30mpm, the thickness of the strip steel is in the range of 0.4-2.5mm, and the normal acceleration and deceleration speed of the unit is +/-0.05 m/s 2 The speed of the rapid stopping speed of the unit is-0.3 m/s 2 The speed of the rapid stop of the unit is-1 m/s 2 The machine set takes a second roller of 4BR (tension roller after the slow cooling section) as a main roller, namely the linear speed of the second roller is the machine set speed. The annealing furnace comprises a preheating section, a radiant tube heating section, a radiant tube soaking section, a slow cooling section (SCS section), a fast cooling section (RCS section), an overaging treatment 1 section, an overaging treatment 2 section, a final jet cooling section and a WQ cooling section. The annealing speed of the strip steel of the unit is automatically controlled by a program, and the maximum production capacity of the unit is controlled by default, so that the maximum unit yield is realized. An input interface of a set target TV value is arranged on an operation picture of an annealing furnace basic automation (L1) system, the target TV value is from a set value on the input interface, and the set value is obtained by a set strip steel annealing speed automatic control program according to a produced steel grade and an annealing curve table in a static table of an annealing temperature control process automation (L2) system. In this embodiment, an example of a static table of an automatic (L2) system for controlling annealing temperature can be seen in table 1, and for example, when 800F2 annealing curves are used for producing steel grade a, the target TV value obtained by table lookup of the annealing speed automatic control program of the strip steel of the machine set is 320, and the speed up-down control is performed in the same manner as in example 1. When the D steel grade was changed over according to the 830N0 annealing curve, the target TV value obtained by the table look-up table of the automatic control program of the annealing speed of the strip steel of the machine set was 280, and the speed increase and decrease were controlled in the same manner as in example 1.
Table 1 example 2 static representation of TV values for an annealing temperature control process automation (L2) system
Note that: -indicating the absence of this annealing curve for the steel grade
The abnormal temporary limiting condition of the unit in this embodiment further includes: WQ tank cooling water temperature T WQ . Upper limit temperature T of deceleration WQmax =45℃. Preset lifting speed limit delta V for automatic speed reduction or lifting of machine set limit =3 mpm. When the temperature T of the cooling water of the WQ tank WQ When the temperature is higher than the upper limit temperature of the deceleration by 45-1=44 ℃, the automatic control program of the annealing speed of the strip steel of the unit automatically decelerates at 3mpm once, simultaneously carries out prompt alarm, and automatically controls the speed of the unit according to the upper limit temperature of the water temperature of the WQ tank by 45-2=43 ℃. The specific control logic is similar and will not be described in detail.
In this embodiment, the unit is provided with a visual automatic identification system for buckling strip steel, when the visual automatic identification system for buckling strip steel identifies that buckling strip steel occurs, the visual automatic identification system for buckling strip steel automatically controls the buckling signal and the buckling type (hot-section buckling and cold-section buckling) generator unit strip steel annealing speed, and after receiving the buckling signal, the automatic control program for the annealing speed of the unit strip steel starts automatic unit speed adjustment according to the buckling type, and the specific method is not repeated, and it is pointed out that, in the actual production process, the automatic control program for the temperature of the unit strip steel is matched with the automatic control program for the buckling strip steel, and the automatic control program for the tension of the unit also automatically performs corresponding tension adjustment control.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. The automatic control method for the annealing speed of the strip steel is characterized by comprising the following steps of: the annealing speed of the unit strip steel is automatically controlled by a program and is controlled by the maximum production capacity of the unit by default, so that the maximization of the unit yield is realized, the maximum production capacity is characterized by a target TV value, the target TV value is the product of the thickness of the incoming strip steel and the maximum speed of the unit operation of the strip steel with the thickness allowed by the unit capacity, and the annealing speed automatic control program of the unit strip steel divides the target TV value by the thickness of the strip steel at the inlet of the annealing furnace to obtain a target V of the annealing speed of the unit strip steel aim The annealing speed target value V of the unit strip steel obtained by the calculation is firstly calculated by the automatic control program of the annealing speed of the unit strip steel aim With maximum speed value V of unit max Comparing, and taking small value as actual control target value V of unit running speed act-aim Then using the actual control target value V of the running speed of the unit act-aim And the current actual speed value V of the main command roller strip steel of the unit act Comparing, if the current actual speed value V of the main roller strip steel of the unit act Actual control target value V of unit running speed act-aim If the annealing speeds are inconsistent, the running speed of the unit is regulated by the automatic control program of the annealing speed of the unit strip steel, so that the current actual speed value V of the unit main roller strip steel act Gradually approaches to actual control target value V of unit running speed act-aim In the speed regulation process, the unit adopts the lifting speed slope of normal operation to lift, but the automatic control program of the annealing speed of the strip steel of the unit can control the maximum value DeltaV of the primary allowable lifting speed max And a minimum steady operation time t after each speed increase and decrease min Preset limit is carried out, if the current actual speed value V of the main roller strip steel of the unit act Actual control target value V of unit running speed act-aim The absolute value of the difference is greater than the maximum value DeltaV of the allowable lifting speed at a time max The unit speed is adjusted only by DeltaV at a time max And the automatic control program of the annealing speed of the strip steel of the unit can automatically count after each speed rise and fall, when the counted time t is longer than the lowest stable running time t min The next adjustment is carried out by the post-procedure until the current actual speed value V of the main roller strip steel of the final unit act Actual control target value V of unit running speed act-aim The absolute value of the difference is less than or equal to the maximum value DeltaV of the allowable lifting speed at a time max The automatic control program of the annealing speed of the strip steel of the unit adjusts the unit speed to the actual control target value V of the running speed of the unit in one step at last act-aim In addition, a set target TV value input interface is arranged on an operation picture of an annealing furnace basic automation (L1) system, the target TV value is from a set value on the input interface, and the set value is input by a set operator according to steel types, annealing curves and set states and operation experience.
2. The automatic control method of the annealing speed of the strip steel according to claim 1, wherein: the set value on the set target TV value input interface is not manually input, but the set strip steel annealing speed automatic control program is used for looking up the values obtained from a static table of an annealing temperature control process automation (L2) system according to the produced steel types and annealing curves, and the values in the static table are dynamically maintained by set process technicians.
3. The automatic control method of the annealing speed of the strip steel according to claim 1, wherein: the set value on the set target TV value input interface is not manually input, but is calculated by a mathematical model according to the steel grade, the specification, the set equipment capacity and the annealing curve by a set annealing speed automatic control program.
4. A method for automatically controlling the annealing speed of a strip steel according to any one of claims 1 to 3, characterized in that: the automatic control program of the annealing speed of the unit strip steel controls the unit speed by taking the abnormal temporary limiting condition of the unit into consideration besides the target TV value, and the annealing speed of the unit strip steel is controlled by the automatic control programThe unit abnormality temporary limiting conditions include: the maximum rotating speed power limit of the RCS fan is carried out, if the RCS fan shaft seal is abnormal, the strip steel is easy to generate oxidation color when the fan rotating speed is higher, the maximum rotating speed power of the RCS fan is limited manually at the moment, under the condition of the temporary limit, the cooling capacity of the RCS fan is limited, the unit is likely to be unable to be produced under a normal target TV value, the automatic control program of the annealing speed of the unit strip steel increases the judgment that whether the power of the RCS fan reaches the maximum rotating speed power limit value and whether the temperature of the RCS outlet strip steel exceeds the allowable temperature upper limit value, if the power of the RCS fan reaches the maximum rotating speed power limit value and the temperature of the RCS outlet strip steel exceeds the allowable temperature upper limit value, the automatic control program of the annealing speed of the unit strip steel controls the automatic speed reduction of the unit by taking the upper limit value of the temperature of the RCS outlet strip steel as the target value of the temperature of the RCS outlet strip steel, and the automatic feedback regulation control of the unit speed of the annealing speed of the unit strip steel is controlled by a preset lifting speed limit delta V under the condition limit Adjusting;
the unit abnormality temporary limiting condition further includes: the maximum rotating speed power limit of the SCS fan is the same as that of the RCS fan, when the rotating speed of the SCS fan reaches the maximum rotating speed power limit value but the temperature of the strip steel at the outlet of the SCS exceeds the allowable upper limit value, the automatic annealing speed control program of the strip steel of the unit controls the unit to automatically slow down, and the automatic feedback regulation control of the unit speed is carried out according to the upper limit of the temperature of the strip steel at the outlet of the SCS as the target value of the temperature of the strip steel at the outlet of the SCS; in this case, the automatic control program of the annealing speed of the strip steel of the unit controls the automatic deceleration or ascent speed of the unit to limit the amplitude DeltaV at the preset ascent speed limit Adjusting, if the maximum rotating speed power limit of the RCS fan and the maximum rotating speed power limit of the SCS fan exist at the same time, controlling the annealing speed of the strip steel of the unit automatically according to the low speed of two limiting conditions, namely, enabling the temperatures of the RCS and the SCS to meet the process requirements and reserving a margin of 5 ℃;
the unit abnormality temporary limiting condition further includes: CPC deviation amount, when the actual deviation amount L of CPC is greater than the preset upper limit value L of the deceleration deviation amount H When in use, the unit strip steelThe annealing speed automatic control program directly and automatically reduces the speed without considering the temperature discrepancy, but the strip steel temperature control program is suitable for the unit speed to automatically control, and simultaneously, the unit strip steel annealing speed automatic control program carries out picture text alarm and sound alarm, reduces the speed according to the unit quick stop speed reduction rate, and the one-time speed reduction amplitude is according to the set delta V quick When the time exceeds the preset time, if the actual CPC running deviation L is still larger than the preset upper limit value L of the running deviation of the speed reduction H The deceleration operation is carried out again, and the operation is carried out circularly until the minimum operation speed allowed by the unit is reduced to be operated at the minimum operation speed for the last time, when the actual running deviation L of CPC is greater than the upper limit value L of the machine halt HH When the annealing speed of the strip steel of the unit is controlled by the automatic control program, the annealing speed of the strip steel of the unit is controlled by the automatic stop and temperature reduction speed, if the actual deviation L of CPC is not greater than the stop upper limit value L HH And back to the allowable up-running deviation value L normal When the duration exceeds the preset time, the automatic control program of the annealing speed of the strip steel of the unit carries out automatic speed-up control;
the unit abnormality temporary limiting condition further includes: WQ tank cooling water temperature T WQ When the temperature T of the cooling water of the WQ tank WQ Above the upper temperature T of deceleration WQmax At the temperature of minus 1 ℃, the automatic control program of the annealing speed of the strip steel of the unit automatically reduces the speed, simultaneously prompts and alarms, and the temperature T is the upper limit temperature of the water temperature of the WQ tank WQmax -2 ℃ automatically controlling the machine set speed, in which case the machine set strip annealing speed automatic control program controls the machine set to automatically slow down or speed up to limit the amplitude DeltaV at the preset speed up and down limit Adjusting;
the unit abnormality temporary limiting condition further includes: when the water conductivity of the WQ tank cooling water is higher than the upper limit of the water conductivity of the WQ tank cooling water by-1 mu s/cm, the automatic control program of the annealing speed of the strip steel of the unit automatically reduces the speed, simultaneously prompts and alarms, and automatically controls the speed of the unit according to the upper limit of the water conductivity of the WQ tank cooling water by-2 mu s/cm, in this case, the strip steel of the unit is retractedThe automatic speed-reducing or speed-increasing of the unit is controlled by the automatic fire speed control program to limit the amplitude delta V of the preset speed-increasing or speed-decreasing limit And adjusting.
5. The automatic control method for annealing speed of strip steel according to claim 4, wherein: the conductivity value of the WQ tank cooling water adopted in control is not an instantaneous value, but an average value calculated by integration in a period of time is taken, and abnormal fluctuation of unit speed control caused by instantaneous fluctuation of the WQ tank cooling water conductivity is avoided.
6. The automatic control method for annealing speed of strip steel according to claim 5, wherein: when two or more than two limiting conditions exist simultaneously, the unit speed is automatically controlled according to all limiting conditions with proper allowance, namely, the most severe condition is met, and the unit operates under the condition of maximum limiting amplitude.
7. The automatic control method of annealing speed of strip steel according to claim 6, wherein: the machine set is provided with a broken belt alarm signal, and when the automatic control program of the annealing speed of the machine set strip steel receives the broken belt alarm signal, the automatic control program of the annealing speed of the machine set strip steel directly carries out automatic shutdown cooling according to the rapid shutdown speed reduction rate.
8. The automatic control method for annealing speed of strip steel according to claim 7, wherein: the machine set is also provided with a strip steel buckling vision automatic identification system, when the strip steel buckling vision automatic identification system identifies that buckling occurs on the strip steel, the strip steel buckling vision automatic identification system sends out picture reminding and sound alarming, an operator changes the machine set speed control from program automatic control into manual control, and the operator carries out machine set speed adjustment and strip steel temperature adjustment operation.
9. The automatic control method for the annealing speed of the strip steel according to claim 8, wherein: when the strip steel buckling vision automatic identification system identifies that buckling occurs on the strip steel, the strip steel buckling vision automatic identification system automatically controls buckling signals and the buckling type generator set strip steel annealing speed, the generator set strip steel annealing speed automatic control program starts to automatically adjust the generator set speed according to the buckling type after receiving the buckling signals, and the generator set strip steel annealing speed automatic control program automatically performs corresponding buckling temperature adjustment control in cooperation with the generator set strip steel temperature automatic control program, and the generator set tension automatic control program automatically performs corresponding tension adjustment control.
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| CN114990293B (en) * | 2022-06-20 | 2024-02-23 | 宝钢湛江钢铁有限公司 | Automatic control method for buckling of cold section of vertical annealing furnace |
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