Temperature control method and annealing furnace temperature control system

Abstract

The invention discloses a temperature control method, an annealing furnace temperature control system, a computer storage medium and a program product, the temperature control method is applied to an annealing furnace, a plurality of process sections are arranged in the annealing furnace, each process section comprises a plurality of control areas, and each control area is provided with a thermocouple; a pyrometer is arranged at the outlet of each process section; the temperature control method comprises the steps that it is determined that the movement speed of strip steel is decreased and exceeds a set speed threshold value within set time; the actual strip steel temperature, measured by each pyrometer, of the outlet of the corresponding process section is obtained; increasing and decreasing the target temperature of each control area according to the actual temperature of the strip steel and the target temperature of the strip steel at the outlet of each process section; acquiring the actual temperature of the control area measured by the thermocouple; and correcting the actual temperature of the control area according to the actual temperature of the control area and the corresponding target temperature of the control area. Abnormal rise of the furnace temperature caused by rapid speed reduction of the strip steel can be avoided, so that the influence on the production quality of the strip steel is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of heat treatment of metal materials, and in particular to a temperature control method and an annealing furnace temperature control system. Background Art

[0002] Annealing in the cold rolling horizontal continuous annealing treatment line includes intermediate annealing and finished product heat treatment. Intermediate annealing is to eliminate the hardening caused by cold deformation of the strip during the cold rolling process through recrystallization to restore the plasticity of the material and reduce the deformation resistance of the metal, preparing for the next cold rolling process. In addition to eliminating hardening through recrystallization, the purpose of finished product heat treatment is to obtain the required internal microstructure (such as ferrite and martensite, etc.) and product properties (such as deep drawing, electromagnetic properties, etc.) according to the technical requirements of the product.

[0003] The continuous annealing processing line generally includes an unwinder, a welding machine, an inlet looper, an annealing furnace, an outlet looper, a coiler, a baler, etc. The entire strip processing process is carried out continuously, and the speed can be as high as 200m / min, with high output. When a problem occurs in any link of the production line, it takes a certain amount of time to deal with it. In order to maintain the continuity of the entire production line, the transmission speed of the production line needs to be reduced to provide enough time to deal with the fault.

[0004] Generally speaking, the entire annealing furnace is divided into several different process sections, and each process section controls the heating power based on the feedback of the furnace temperature. Depending on the product process, the annealing temperature ranges from 900 to 1100 degrees. Since the annealing furnace is a multivariable complex process system with large inertia and large hysteresis, the control must not only ensure the control accuracy in steady state, but also ensure rapid response under dynamic change process.

[0005] For the cold-rolled horizontal continuous annealing line that produces narrow strips (strip width less than 1000mm), when the production line encounters a fault and needs to quickly reduce the production line speed, the strip is stretched in the furnace section and the width becomes narrower, which does not meet the quality control requirements. After analysis, it was found that during the speed reduction period, due to the high temperature in the furnace, when the strip width is narrow, the strip is stretched under the action of the strip tension during the speed reduction, resulting in a narrowing of the width. Summary of the invention

[0006] The purpose of the present invention is to solve the problem that when the production line encounters a fault and the production line speed drops rapidly, the furnace temperature rises abnormally, affecting the production quality of the strip steel. The present invention provides a temperature control method and an annealing furnace temperature control system, which can adjust the furnace temperature, avoid abnormal increase in the furnace temperature, and reduce the impact on the production quality of the strip steel.

[0007] To solve the above technical problems, an embodiment of the present invention discloses a temperature control method, which is applied to an annealing furnace, wherein the annealing furnace is provided with a plurality of process sections, wherein the plurality of process sections are used to perform heat treatment on a steel strip, and the steel strip is used to be sequentially and continuously transmitted in the plurality of process sections, wherein each of the process sections includes a plurality of control areas, and each of the control areas is provided with a thermocouple; a pyrometer is provided at the outlet of each of the process sections to measure the actual temperature of the steel strip at the outlet of each of the process sections; the temperature control method comprises:

[0008] Determine that the moving speed of the strip steel drops by more than a set speed threshold within a set time;

[0009] Obtaining the actual temperature of the strip steel at the outlet of the corresponding process section measured by each of the pyrometers;

[0010] According to the actual temperature of the steel strip and the target temperature of the steel strip at the outlet of each process section, increase or decrease the target temperature of each control area;

[0011] Obtaining the actual temperature of the control area corresponding to each thermocouple measured;

[0012] The actual temperature of each control area is corrected according to the actual temperature of the control area and the corresponding target temperature of the control area.

[0013] By adopting the above technical solution, by determining that the movement speed of the steel strip has dropped by more than the set speed threshold within the set time, that is, confirming that the movement speed of the steel strip has dropped rapidly, the target temperature of each control area is increased or decreased according to the actual temperature of the steel strip at the process section outlet measured by the pyrometer and the target temperature of the steel strip. Then, the deviation is calculated based on the actual temperature of the control area measured by the thermocouple and the target temperature of each control area after the increase or decrease, and the actual temperature of each control area is corrected according to the deviation, so that the actual temperature of each control area (also known as the furnace temperature) can be guaranteed to be within a reasonable range, that is, there is no abnormal increase, thereby reducing the impact on the production quality of the steel strip.

[0014] In summary, the heating or cooling power of each process section is quickly adjusted by utilizing the temperature change of the strip, which avoids the problem of abnormal temperature increase in the annealing furnace after the strip is quickly decelerated, thereby reducing to a certain extent the problem of the strip (especially narrow strip, the strip width is less than 1000mm) being stretched and narrowed under tension due to the high temperature in the annealing furnace.

[0015] According to another specific embodiment of the present invention, a furnace roller is provided in the annealing furnace, and the furnace roller is used to support and drive the strip to move. The furnace roller is driven to rotate by a motor, and an encoder is provided on the motor; the determination that the movement speed of the strip has dropped by more than a set speed threshold within a set time includes: obtaining a first rotational speed of the furnace roller detected by the encoder at a first moment, and calculating a first speed of the strip at the first moment according to the first rotational speed; obtaining a second rotational speed of the furnace roller detected by the encoder at a second moment, and calculating a second speed of the strip at the second moment according to the second rotational speed; the set time is the difference between the second moment and the first moment, the speed drop of the strip is the difference between the third speed and the fourth speed, and determining that the speed drop of the strip is greater than the set speed threshold.

[0016] According to another specific implementation of the present invention, the set time is 3s, and the set speed threshold is 30m / min.

[0017] According to another specific embodiment of the present invention, increasing or decreasing the target temperature of each control area according to the actual temperature of the strip and the target temperature of the strip at the outlet of each process section includes: a PID controller calculates a correction amount according to the actual temperature of the strip and the target temperature of the strip at the outlet of each process section, and a PLC controller increases or decreases the target temperature of each control area based on the correction amount.

[0018] According to another specific embodiment of the present invention, each of the process sections has its corresponding process equipment; correcting the actual temperature of each of the control areas according to the actual temperature of the control area and the target temperature of the control area corresponding to it includes: a PID controller calculates power values ​​of all the control areas according to the actual temperature of the control area and the target temperature of the control area corresponding to it, and a PLC controller controls the power output of the process equipment corresponding to each of the process sections based on the power value to correct the actual temperature of each of the control areas.

[0019] According to another specific embodiment of the present invention, a tension roller group is respectively provided at the outlet and the inlet of the annealing furnace, each tension roller group includes two tension rollers, and the two tension rollers are used to cooperate to tension the strip steel; the speed difference between the two tension rollers can be reduced to reduce the tension of the strip steel.

[0020] By adopting the above technical solution, the tension of the steel strip is reduced, thereby avoiding stretching the steel strip under high tension and affecting the production quality of the steel strip.

[0021] According to another specific embodiment of the present invention, the outlet and the inlet of the annealing furnace are both provided with tension meters, and the tension meters are used to measure the tension of the steel strip.

[0022] By adopting the above technical solution, the tension meter monitors the tension changes of the strip in real time. On the one hand, it can avoid the tension of the strip from changing beyond the demand, and on the other hand, it can also facilitate the adjustment of the tension of the strip when necessary.

[0023] The embodiment of the present invention further discloses an annealing furnace temperature control system, comprising:

[0024] A plurality of process sections for heat treating the steel strip, wherein the steel strip is used to be continuously transported in the plurality of process sections in sequence, and each of the process sections includes a plurality of control areas;

[0025] a thermocouple disposed in each of the control regions;

[0026] A pyrometer is provided at the outlet of each process section to measure the actual temperature of the strip at the outlet of each process section; and a controller is used to execute the above-mentioned temperature control method.

[0027] The embodiment of the present invention further discloses a computer storage medium, including a memory and a processor, wherein the memory is suitable for storing computer instructions, and the processor is suitable for executing the above-mentioned temperature control method when running the computer instructions.

[0028] The embodiment of the present invention further discloses a computer program product, including a computer program / instruction, wherein the computer program / instruction implements the above-mentioned temperature control method when executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of an annealing furnace according to an embodiment of the present invention is shown;

[0030] Figure 2 A schematic diagram showing a DFF segment distributed with multiple control areas according to an embodiment of the present invention;

[0031] Figure 3 The process of the method for controlling the tension of the strip steel according to the embodiment of the present invention is shown as follows Figure 1 ;

[0032] Figure 4 The process of the method for controlling the tension of the strip steel according to the embodiment of the present invention is shown as follows Figure 2 ;

[0033] Figure 5 A block diagram of an electronic device provided by an embodiment of the present invention is shown;

[0034] Figure 6 A block diagram of a system on chip (SoC) provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0035] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may extend based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0036] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0037] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0039] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0040] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] An embodiment of the present application provides a temperature control method, which is applied to an annealing furnace. Figure 1 A schematic diagram of an annealing furnace is shown. Figure 1As shown, the outlet 101 and the inlet 100 of the annealing furnace are respectively provided with a tension roller group 200, and each tension roller group 200 includes two tension rollers 201 and a tension roller 202 that are offset up and down, and the two tension rollers 201 and tension rollers 202 that are offset up and down of each tension roller group 200 cooperate to tension the strip steel 10.

[0042] The annealing furnace is provided with furnace rollers (not shown in the figure) and motors (not shown in the figure). The furnace rollers support the steel strip 10. The motor drives the furnace rollers to rotate so as to move the steel strip 10 on the furnace rollers. The motor is provided with encoders for detecting the rotation speed of the furnace rollers.

[0043] A plurality of process sections are arranged between the two tension roller groups 200 , and the furnace rollers drive the steel strip 10 to be continuously transmitted in sequence through the plurality of process sections, so as to perform corresponding processing on the steel strip 10 in each process section.

[0044] Specifically, the plurality of process sections include a DFF (direct firing furnace) section 301, an ESF (electrical soaking furnace) section 302, an ATC (air tube cooling) section 303, an AQS (air quench section) section 304, a WCS (water cooling section) section 305 and a drying section 306, which are arranged in sequence. The DFF section 301 heats the steel strip 10 through a burner (not shown in the figure) to heat the steel strip 10 to a set temperature (e.g., 990°C). The ESF section 302 heats the steel strip 10 heated by the DFF section 301 through an electric heating radiation tube (not shown in the figure) to make the internal temperature of the steel strip 10 uniform and the structure transformation sufficient. The ATC section 303 is to slowly cool the steel strip 10 through an air radiation tube (not shown in the figure) to reduce internal stress, prevent cracks or deformation of the steel strip 10 during the cooling process, and allow certain undesirable structures (such as carbides) to precipitate. The AQS section 304 is to quickly cool the steel strip 10 through a cooling fan (not shown in the figure) to prevent further growth of grains, maintain a certain grain size, and begin to fix certain organizational structures. The WCS section 305 is to spray cooling water onto the surface of the steel strip 10 through a nozzle (not shown in the figure) to cool the steel strip 10. The drying section 306 is to remove moisture from the surface of the steel strip 10 through a fan (not shown in the figure) to facilitate subsequent processing.

[0045] A pyrometer 500 is provided at the outlet of each of the above-mentioned process sections. The pyrometer 500 measures the actual temperature of the steel strip at the outlet of each process section in real time to detect whether the temperature of the steel strip 10 after passing through each process section meets the process requirements.

[0046] Each of the above process sections includes multiple control areas ( Figure 1 Not shown), each control area is equipped with several thermocouples ( Figure 1 (not shown) to measure the temperature of the corresponding control area through a thermocouple. For example, each process section is divided into multiple control areas, and each control area is equipped with several thermocouples for temperature measurement, thereby ensuring accurate temperature control. Figure 2 As shown, Figure 2 The schematic diagram shows that the DFF section 301 is distributed with 8 control areas, and each control area has 2 thermocouples. It should be noted that: Figure 2 The arrangement shown is only for the convenience of explaining the technical solution. In other embodiments, the arrangement of the control areas and the thermocouples should be various. The ESF section 302 also has 8 control areas, each of which has 2 thermocouples. The ATC section 303 has 6 control areas, each of which has 2 thermocouples. However, this application does not limit this.

[0047] The exit 101 and the entrance 100 of the annealing furnace are both provided with a tension meter 400, wherein: Figure 1 The tension meter 400 at the outlet 101 is not shown. The tension meter 400 is used to measure the tension of the steel strip. Specifically, the tension meter 400 at the entrance 100 of the annealing furnace is arranged between the tension roller group 200 and the first process section (i.e., the DFF section 301) to monitor the tension of the steel strip 10 entering the annealing furnace in real time, thereby ensuring that the tension of the steel strip 10 in the annealing furnace is within a safe range, preventing the steel strip from breaking due to excessive tension, or the steel strip 10 from piling up on the furnace rollers due to insufficient tension. In addition, it is also convenient to adjust the tension of the steel strip when necessary. The tension meter 400 at the outlet 101 of the annealing furnace is arranged before the tension roller group 200 at the outlet 101 to monitor the tension of the steel strip 10 when it passes out of the annealing furnace.

[0048] When the production line speed in the annealing furnace (that is, the speed at which the strip moves) is reduced due to a fault in other links, the strip stays in the annealing furnace for a longer time during the speed reduction period, which will absorb too much heat and cause the temperature in the annealing furnace to be high, affecting the quality of the produced strip.

[0049] Based on this, an embodiment of the present application provides a temperature control method for controlling the temperature of an annealing furnace.

[0050] refer to Figure 1 , Figure 3 and Figure 4 The temperature control method of the annealing furnace in the embodiment of the present application comprises the following steps:

[0051] S1: Determine whether the moving speed of the strip steel drops by more than the set speed threshold value v within the set time t.

[0052] Exemplarily, the first rotation speed n1 of the furnace roller detected by the encoder at the first time t1 is obtained, and the first speed v1 of the strip at the first time t1 is calculated according to the first rotation speed n1, that is, v1=πdn1, where d is the diameter of the furnace roller and n1 is the first rotation speed of the furnace roller.

[0053] The second rotation speed n2 of the furnace roller detected by the encoder at the second time t2 is obtained, and the second speed v2 of the strip at the second time t2 is calculated according to the second rotation speed n2, that is, v2=πdn2, where d is the diameter of the furnace roller and n2 is the second rotation speed of the furnace roller.

[0054] The set time t is the difference between the second moment t2 and the first moment t1 (i.e. t=t2-t1), and the speed drop Δv of the strip within the set time t is the difference between the first speed v1 and the second speed v2 (i.e. Δv=v1-v2). It is determined whether the speed drop Δv of the strip within the set time t is greater than the set speed threshold v.

[0055] In this embodiment, for example, the time t is set to 3 s, and the speed threshold v is set to 30 m / min.

[0056] This embodiment determines whether the moving speed of the strip steel decreases by more than 30 m / min within 3 seconds. If not, the annealing furnace is in a steady-state mode, otherwise it is in a transition mode.

[0057] The steady-state mode is first described below with reference to the accompanying drawings.

[0058] S11: Determine that the moving speed of the strip does not drop below a set speed threshold value v within a set time t.

[0059] For example, the first rotation speed n1 of the furnace roller detected by the encoder at the first moment t1 (for example, the 1st second, that is, any moment when the annealing furnace is in normal working condition is taken as the first moment t1, and this moment is recorded as the 1st second) is 170r / min, and the diameter d of the furnace roller is 0.15m. Then, the first speed v1 of the strip at the first moment t1 is 3.14*0.15*170=80m / min.

[0060] Correspondingly, the second rotation speed n2 of the furnace roller detected by the encoder at the second moment t2 (for example, the 4th second, the second moment t2 is a moment after the first moment t1) is 130r / min, and the diameter d of the furnace roller is 0.15m. Then the second speed of the strip at the second moment t2 is v2=3.14*0.15*130=61m / min.

[0061] The speed drop of the strip within the set time t is Δv=v1-v2=19m / min, and the speed of the strip drops by 19m / min within 3s, which is less than 30m / min. It is determined that the movement speed of the strip does not drop below the set speed threshold v within the set time t, and is in steady-state mode.

[0062] S111: Obtain the actual temperature T5 of the corresponding control area measured by the thermocouple.

[0063] Exemplarily, the DFF section 301 has 8 control areas, and the actual temperatures T5 of each control area measured by the thermocouple 310 are 1030°C, 1072°C, 1083°C, 1079°C, 1078°C, 1094°C, 1089°C, and 1090°C, respectively; the ESF section 302 also has 8 control areas, and the actual temperatures of each control area measured by the thermocouple are 978°C, 974°C, 972°C, 971°C, 971°C, 970°C, 966°C, and 967°C, respectively; the ATC section 303 has 6 control areas, and the actual temperatures of each control area measured by the thermocouple are 819°C, 768°C, 727°C, 701°C, 680°C, and 655°C, respectively.

[0064] S112: Based on the actual temperature T5 of each control area measured by the thermocouple and the target temperature T3 that each control area needs to reach, the PID controller calculates the heating or cooling power value of all control areas in real time, and the PLC controller controls the power output of the corresponding process equipment in each control area (such as the burner of the DFF section 301, the electric heating radiant tube of the ESF section 302, the cooling fan of the ATC section 303, etc.) according to this power value to achieve the heating or cooling requirements of each process section.

[0065] For example, the target temperatures T3 of each control area corresponding to the DFF section 301 are 1030°C, 1070°C, 1080°C, 1080°C, 1080°C, 1090°C, 1090°C, 1090°C; the PID controller calculates in real time that the heating power of each control area is 50.3%, 47.1%, 42.8%, 58.6%, 30.3%, 56.5%, 44.7%, and 49.8% respectively; then the power output of the burner in each control area is 50.3%, 47.1%, 42.8%, 58.6%, 30.3%, 56.5%, 44.7%, and 49.8% respectively, thereby meeting the heating demand of the DFF section 301.

[0066] Correspondingly, the target temperatures T3 of each control area corresponding to the ESF section 302 are 970°C, 970°C, 970°C, 970°C, 970°C, 970°C, 970°C, 970°C, and 970°C, respectively. The PID controller calculates in real time that the heating power of each control area is 0%, 0%, 7%, 15%, 13.3%, 11.1%, 14.9%, and 25.1%, respectively; then the power output of the electric heating radiant tube in each control area is 0%, 0%, 7%, 15%, 13.3%, 11.1%, 14.9%, and 25.1%, respectively, thereby meeting the insulation requirements of the ESF section 302.

[0067] The target temperatures T3 of each control area corresponding to the ATC section 303 are 820°C, 770°C, 730°C, 700°C, 680°C, and 670°C, respectively. The PID controller calculates the cooling power of each control area in real time to be 28.5%, 31.7%, 26.3%, 25.2%, 13.9%, and 10%, respectively. Then the power output of the cooling fan in each control area is 28.5%, 31.7%, 26.3%, 25.2%, 13.9%, and 10%, respectively, thereby meeting the cooling demand of the ATC section 303.

[0068] In this steady-state mode, the PLC controller adjusts the temperature by ±1°C. That is, in the steady-state mode, the temperature adjustment range is small, ensuring high steady-state control accuracy.

[0069] refer to Figure 1 , Figure 3 and Figure 4 , the transition mode will be described below in conjunction with the accompanying drawings.

[0070] S12: Determine whether the moving speed of the strip steel decreases by more than a set speed threshold value v within a set time t.

[0071] For example, the first rotation speed n1 of the furnace roller detected by the encoder at the first moment t1 (for example, the 1st second, that is, any moment when the annealing furnace is in normal working condition is taken as the first moment t1, and this moment is recorded as the 1st second) is 170r / min, and the diameter d of the furnace roller is 0.15m. Then, the first speed v1 of the strip at the first moment t1 is 3.14*0.15*170=80m / min.

[0072] Correspondingly, the second rotation speed n2 of the furnace roller detected by the encoder at the second moment t2 (for example, the 4th second) is 100 r / min, and the diameter d of the furnace roller is 0.15 m. The second speed of the strip at the second moment t2 is v2 = 3.14*0.15*100 = 47 m / min.

[0073] The speed drop of the steel strip 10 within the set time t is Δv=v1-v2=80-47=33m / min, thereby determining that the movement speed of the steel strip has dropped by more than the set speed threshold v (i.e. 30m / min) within the set time t (i.e. 3s), and is now in transition mode.

[0074] In the transition mode, the embodiment of the present application adjusts the heating or cooling power of each process section according to the actual temperature change of the strip at the outlet of each process section, thereby avoiding the problem of increased temperature of the annealing furnace due to rapid deceleration of the strip (that is, after entering the transition mode).

[0075] The specific steps are as follows:

[0076] S121: Obtain the actual temperature T1 of the strip at the outlet of the corresponding process section measured by each pyrometer.

[0077] That is, the pyrometer 500 disposed at the exit of each process section is used to measure the actual temperature T1 of the steel strip exiting from the process section.

[0078] Taking the DFF section as an example, in the transition mode, the actual strip temperature T1 measured by the pyrometer 500 at the outlet of the DFF section 301 is 990°C, the actual strip temperature T1 at the outlet of the ESF section 302 is 987°C, and the actual strip temperature T1 at the outlet of the ATC section 303 is 776°C.

[0079] S122: increasing or decreasing the target temperature T3 of each control area according to the actual strip temperature T1 at the outlet of each process section and the target strip temperature T2 at the outlet of each process section.

[0080] Specifically, according to the actual strip temperature T1 at the outlet of each process section and the target strip temperature T2 at the outlet of each process section, the PID controller calculates the correction amount, and the PLC controller increases or decreases the target temperature T3 of each control area according to the correction amount.

[0081] Specifically, the moving speed of the steel strip decreases rapidly (i.e., the speed decreases by more than 30 m / min within 3 seconds in this embodiment). If each control area still maintains the original target temperature T3, it is difficult for the steel strip at the outlet of each process section to reach its target temperature T2. Therefore, the PLC controller automatically increases or decreases the target temperature T3 of each control area according to the correction amount. For example, if the target temperature T2 of the steel strip at the outlet of the DFF section 301 is 970°C, the PID controller automatically calculates the required correction amount to be -30°C. The PLC controller reduces the target temperature T3 of each control area of ​​the DFF section 301 by 30°C according to the correction amount -30°C. For example, the target temperatures T3 of each zone corresponding to the DFF segment are 1030℃, 1070℃, 1080℃, 1080℃, 1080℃, 1090℃, 1090℃, and 1090℃ respectively. If they are all reduced by 30℃, the target temperatures T4 of each control area after the reduction will be 1000℃, 1040℃, 1050℃, 1050℃, 1050℃, 1060℃, 1060℃, and 1060℃.

[0082] Correspondingly, the target temperature T2 of the strip at the outlet of the ESF section 302 is 970°C, and the PID controller automatically calculates the required correction amount to be -20°C. The PLC controller reduces the target temperature T3 of each control area of ​​the ESF section 302 by 20°C according to the correction amount -20°C. For example, the target temperatures T3 of each control area corresponding to the ESF section 302 are 970°C, 970°C, 970°C, 970°C, 970°C, 970°C, 970°C, 970°C, and 970°C, respectively. If they are all reduced by 20°C, the target temperatures T4 of each control area after the reduction are 950°C, 950°C, 950°C, 950°C, 950°C, 950°C, 950°C, 950°C, and 950°C.

[0083] Correspondingly, the target temperature T2 of the strip at the outlet of the ATC section 303 is 760℃, and the PID controller automatically calculates the required correction amount to be -20℃. The PLC controller reduces the target temperature T3 of each control area of ​​the ATC section 303 by 20℃ according to the correction amount -20℃. For example, the target temperatures of each control area corresponding to the ATC section 303 are 820℃, 770℃, 730℃, 700℃, 680℃, and 670℃, respectively. If they are all reduced by 20℃, the target temperatures T4 of each control area after the reduction are 800℃, 750℃, 710℃, 680℃, 660℃, and 650℃.

[0084] It should be noted that the above three correction values ​​-30°C, -20°C and -20°C are the results of comprehensive calculation by the PID controller based on the proportional coefficient, integral coefficient and differential coefficient set by the system and taking into account the current dynamic state of the system.

[0085] S123: Obtain the actual temperature T5 of the corresponding control area measured by the thermocouple.

[0086] Taking the DFF section as an example, the DFF section 301 has 8 control areas, and the actual temperatures T5 of each control area measured by its thermocouples are 1030°C, 1072°C, 1083°C, 1079°C, 1078°C, 1094°C, 1089°C, and 1090°C respectively.

[0087] The ESF section 302 also has 8 control areas, and the actual temperatures T5 of each control area measured by the thermocouple are: 978°C, 974°C, 972°C, 971°C, 971°C, 970°C, 966°C, and 967°C, respectively. The ATC section 303 has 6 control areas, and the actual temperatures T5 of each control area measured by the thermocouple are: 819°C, 768°C, 727°C, 701°C, 680°C, and 655°C, respectively.

[0088] S124: Correcting the actual temperature T5 of each control area according to the actual temperature T5 of the control area and the target temperature T4 of the corresponding control area.

[0089] Specifically, the PID controller calculates the heating or cooling power value of all control areas in real time, and the PLC controller controls the power output of the corresponding process equipment in each control area (such as the burner of the DFF section 301, the electric heating radiant tube of the ESF section 302, the cooling fan of the ATC section 303, etc.) according to this power value to achieve the heating or cooling requirements of each process section.

[0090] Taking DFF section 301 as an example, the actual temperatures T5 of each control area are 1030°C, 1072°C, 1083°C, 1079°C, 1078°C, 1094°C, 1089°C, 1090°C, and the corresponding target temperatures T4 of each area are 1000°C, 1040°C, 1050°C, 1050°C, 1050°C, 1060°C, 1060°C, 1060°C. The PID controller calculates the heating power of each control area in real time as 28.2%, 22.3%, 20.7%, 30.5%, 17.5%, 36.7%, 32.1%, 38.2%; the power output of the burner in each control area of ​​the DFF section is 28.2%, 22.3%, 20.7%, 30.5%, 17.5%, 36.7%, 32.1%, 38.2%.

[0091] Taking the ESF section 302 as an example, the actual temperatures T5 of each control area are 978°C, 974°C, 972°C, 971°C, 971°C, 970°C, 966°C, and 967°C, and the corresponding target temperatures T4 of each area are 950°C, 950°C, 950°C, 950°C, 950°C, 950°C, 950°C, and 950°C. The PID controller calculates the heating power of each control area in real time as 0%, 0%, 0%, 5%, 7%, 6.7%, 10.2%, and 15.6%; the power output of the electric heating radiant tube in each control area of ​​the ESF section 302 is 0%, 0%, 0%, 5%, 7%, 6.7%, 10.2%, and 15.6% respectively.

[0092] Taking ATC section 303 as an example, the actual temperatures T5 of each control area are 819°C, 768°C, 727°C, 701°C, 680°C, and 655°C, respectively, and the corresponding target temperatures T4 of each area are 800°C, 750°C, 710°C, 680°C, 660°C, and 650°C, respectively. The PID controller calculates the cooling power of each control area in real time to be 35.2%, 40.1%, 32.3%, 30.7%, 19%, and 17.8%, respectively; then the power output of the cooling fan in each control area of ​​ATC section 303 is 35.2%, 40.1%, 32.3%, 30.7%, 19%, and 17.8%, respectively.

[0093] In this transition mode, the PLC controller adjusts the temperature to -70 to +20°C. In the transition mode, high dynamic control accuracy and fast transition can be guaranteed.

[0094] In summary, the heating or cooling power of each process section is quickly adjusted by utilizing the temperature change of the strip, which avoids the problem of abnormal temperature increase in the annealing furnace after the strip is quickly decelerated, thereby reducing to a certain extent the problem of the strip (especially narrow strip, the strip width is less than 1000mm) being stretched and narrowed under tension due to the high temperature in the annealing furnace.

[0095] In this transition mode, when it is detected that the speed of the strip has not continued to drop by more than the set speed threshold v within each set time t for 5 minutes, corresponding to this embodiment, it is detected that the speed of the strip has not continued to drop by more than 30m / min within every 3s for 5 minutes, then the steady-state mode is restored.

[0096] In addition, in order to further deal with the problem that the strip is stretched and narrowed under tension due to the rapid decrease in the speed of the strip in the annealing furnace, the embodiment of the present application reduces the speed difference between the two tension rollers in any one or both of the two tension roller groups 200 to reduce the tension of the strip to a set value.

[0097] Specifically, the present embodiment is provided with two tension roller groups 200. To more comprehensively adjust the strip tension, the speed difference between the two tension rollers of each tension roller group can be adjusted.

[0098] In this embodiment, the strip tension is 14KN in the initial state. After entering the transition mode, the speed difference of the tension roller is adjusted to change the tension of the strip 10 to 8KN, so as to avoid stretching the strip 10 under high tension and affecting the production quality of the strip 10. The specific adjustment data of the strip tension 10 needs to be set accordingly according to the change in the strip speed. For example, if the speed of the strip is reduced from 80m / min to 47m / min within 3s, the strip tension can be reduced from 14KN to 8KN.

[0099] The two tension meters 400 can provide real-time tension data, which are direct feedback sources for the PLC controller. Through real-time monitoring, the PLC controller can determine the accuracy of the tension adjustment of the strip steel 10.

[0100] It should be noted that the adjustment of the tension of the steel strip 10 may be performed simultaneously with step S121 or may be performed before step S121.

[0101] In this embodiment, the annealing furnace is a horizontal annealing furnace. The above temperature control method is also applied to the horizontal annealing furnace. However, those skilled in the art will appreciate that in other embodiments, the above temperature control method can also be applied to other forms of annealing furnaces, such as vertical annealing furnaces.

[0102] The embodiment of the present application also provides an annealing furnace temperature control system, including: multiple process sections for heat treating the strip steel 10, the strip steel is used to be continuously transmitted in the multiple process sections in sequence, and each process section includes multiple control areas; a thermocouple is arranged in each control area; a pyrometer 500 is arranged at the outlet of each process section to measure the actual temperature of the strip steel at the outlet of each process section; a controller is used to execute the above-mentioned temperature control method. Exemplarily, the controller is the above-mentioned PID controller and PLC controller, and the two cooperate to execute the above-mentioned temperature control method.

[0103] In addition, the present invention also provides a computer storage medium, including a memory and a processor, wherein the memory is suitable for storing computer instructions, and the processor is suitable for executing the temperature control method described in any of the above embodiments when running the computer instructions.

[0104] Reference now Figure 5, shown is a block diagram of an electronic device 600 according to an embodiment of the present application. The electronic device 600 is, for example, a smart mobile terminal. The electronic device 600 may include one or more processors 601 coupled to a controller hub 603. For at least one embodiment, the controller hub 603 communicates with the processor 601 via a multi-branch bus such as a front-side bus (FSB), a point-to-point interface such as a QuickPath Interconnect (QPI), or a similar connection. The processor 601 executes instructions that control general types of data processing operations. In one embodiment, the controller hub 603 includes, but is not limited to, a graphics memory controller hub (GMCH, Graphics & Memory Controller Hub) (not shown) and an input / output hub (IOH, Input Output Hub) (which may be on a separate chip) (not shown), wherein the GMCH includes a memory and a graphics controller and is coupled to the IOH.

[0105] The electronic device 600 may also include a coprocessor 602 and a memory 604 coupled to a controller hub 603. Alternatively, one or both of the memory and the GMCH may be integrated within the processor, with the memory 604 and the coprocessor 602 directly coupled to the processor 601 and the controller hub 603, with the controller hub 603 and the IOH being in a single chip.

[0106] The memory 604 may be, for example, a dynamic random access memory (DRAM), a phase change memory (PCM), or a combination of the two. The memory 604 may include one or more tangible, non-transitory computer-readable media for storing data and / or instructions. The computer-readable storage medium stores instructions, specifically, temporary and permanent copies of the instructions. The instructions may include: when executed by at least one of the processors, causing the electronic device 600 to implement the following: Figure 3 When the instructions are executed on a computer, the computer executes the method disclosed in any one of the above embodiments or combined embodiments to control the temperature of the annealing furnace.

[0107] In one embodiment, the coprocessor 602 is a special-purpose processor, such as, for example, a high-throughput MIC (Many Integrated Core) processor, a network or communication processor, a compression engine, a graphics processor, a GPGPU (General-purpose computing on graphics processing units), or an embedded processor. The optional nature of the coprocessor 602 is indicated by a dashed line in FIG. Figure 5 middle.

[0108] In one embodiment, the electronic device 600 may further include a network interface (NIC, Network Interface Controller) 606. The network interface 606 may include a transceiver for providing a radio interface for the electronic device 600, and then communicating with any other suitable device (such as a front-end module, an antenna, etc.). In various embodiments, the network interface 606 may be integrated with other components of the electronic device 600. The network interface 606 may implement the functions of the communication unit in the above-mentioned embodiments.

[0109] The electronic device 600 may further include an input / output (I / O) device 605. The I / O 605 may include: a user interface designed to enable a user to interact with the electronic device 600; a peripheral component interface designed to enable peripheral components to interact with the electronic device 600; and / or a sensor designed to determine environmental conditions and / or location information related to the electronic device 600.

[0110] It is worth noting that Figure 5 This is for illustrative purposes only. Figure 5 It is shown that the electronic device 600 includes multiple devices such as a processor 601, a controller hub 603, a memory 604, etc.; however, in actual applications, the device using the methods of the present application may include only a portion of the devices in the electronic device 600, for example, it may include only the processor 601 and the network interface 606. Figure 5 The properties of optional devices are shown with dotted lines.

[0111] Reference now Figure 6 , which is a block diagram of a SoC (System on Chip) 700 according to an embodiment of the present application. Figure 6 In the FIG, similar components have the same reference numerals. In addition, the dashed boxes are optional features of more advanced SoCs. Figure 6In the embodiment, the SoC includes: an interconnect unit 750, which is coupled to a processor 710; a system agent unit 780; a bus controller unit 790; an integrated memory controller unit 740; a group or one or more coprocessors 720, which may include integrated graphics logic, an image processor, an audio processor, and a video processor; a static random access memory (SRAM) unit 730; and a direct memory access (DMA) unit 760. In one embodiment, the coprocessor 720 includes a special-purpose processor, such as, for example, a network or communication processor, a compression engine, a GPGPU (General-purpose computing on graphics processing units), a high-throughput MIC processor, or an embedded processor.

[0112] Static random access memory (SRAM) unit 730 may include one or more tangible, non-transitory computer-readable media for storing data and / or instructions. The computer-readable storage medium stores instructions, and more specifically, stores temporary and permanent copies of the instructions. The instructions may include: when executed by at least one of the processors, causing the SoC to implement the following: Figure 3 When the instructions are executed on a computer, the computer is caused to execute the method disclosed in the above embodiments.

[0113] The embodiments of the present application also provide a computer program product for implementing the temperature control methods provided in the above embodiments.

[0114] The various embodiments of the mechanism disclosed in the present application can be implemented in hardware, software, firmware or a combination of these implementation methods. The embodiments of the present application can be implemented as a computer program module or module code executed on a programmable system, and the programmable system includes at least one processor, a storage system (including volatile and non-volatile memory and / or storage elements), at least one input device and at least one output device.

[0115] A computer program module or module code can be applied to input instructions to perform the functions described in this application and generate output information. The output information can be applied to one or more output devices in a known manner. For the purposes of this application, a processing system includes any system having a processor such as, for example, a digital signal processor (DSP), a microcontroller, an application specific integrated circuit (ASIC), or a microprocessor.

[0116] Module code can be implemented with high-level modular language or object-oriented programming language to communicate with the processing system. When necessary, module code can also be implemented with assembly language or machine language. In fact, the mechanism described in this application is not limited to the scope of any specific programming language. In either case, the language can be a compiled language or an interpreted language.

[0117] In some cases, the disclosed embodiments may be implemented in hardware, firmware, software, or any combination thereof. The disclosed embodiments may also be implemented as instructions carried or stored on one or more temporary or non-temporary machine-readable (e.g., computer-readable) storage media, which may be read and executed by one or more processors. For example, instructions may be distributed over a network or through other computer-readable media. Therefore, a machine-readable medium may include any mechanism for storing or transmitting information in a machine (e.g., computer) readable form, including, but not limited to, a floppy disk, an optical disk, an optical disk, a magneto-optical disk, a read-only memory (ROM), a random access memory (RAM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic card or an optical card, a flash memory, or a tangible machine-readable memory for transmitting information (e.g., a carrier wave, an infrared signal, a digital signal, etc.) using the Internet in an electrical, optical, acoustic, or other form of propagation signal. Accordingly, machine-readable media include any type of machine-readable media suitable for storing or transmitting electronic instructions or information in a form readable by a machine (eg, a computer).

[0118] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A temperature control method, applied to an annealing furnace, characterized in that: The annealing furnace is provided with a plurality of process sections, the plurality of process sections are used to perform heat treatment on the strip steel, the strip steel is used to be sequentially and continuously transmitted in the plurality of process sections, each of the process sections includes a plurality of control areas, each of the control areas is provided with a thermocouple; a pyrometer is provided at the outlet of each process section to measure the actual temperature of the strip steel at the outlet of each process section; The temperature control method comprises: Determine that the moving speed of the strip steel drops by more than a set speed threshold within a set time; Obtaining the actual temperature of the strip steel at the outlet of the corresponding process section measured by each of the pyrometers; According to the actual temperature of the steel strip and the target temperature of the steel strip at the outlet of each process section, increase or decrease the target temperature of each control area; Obtaining the actual temperature of the control area corresponding to each thermocouple measured; The actual temperature of each control area is corrected according to the actual temperature of the control area and the corresponding target temperature of the control area.

2. The temperature control method according to claim 1, characterized in that: The annealing furnace is provided with furnace rollers for supporting and driving the strip to move, the furnace rollers are driven to rotate by a motor, and the motor is provided with an encoder; the determination that the movement speed of the strip has dropped by more than a set speed threshold within a set time comprises: obtaining a first rotational speed of the furnace roller detected by the encoder at a first moment, and calculating a first speed of the strip at the first moment according to the first rotational speed; obtaining a second rotational speed of the furnace roller detected by the encoder at a second moment, and calculating a second speed of the strip at the second moment according to the second rotational speed; the set time is the difference between the second moment and the first moment, the speed drop of the strip is the difference between the third speed and the fourth speed, and determining that the speed drop of the strip is greater than the set speed threshold.

3. The temperature control method according to claim 2, characterized in that: The set time is 3s, and the set speed threshold is 30m / min.

4. The temperature control method according to claim 2, characterized in that: The method of increasing or decreasing the target temperature of each control area according to the actual temperature of the strip and the target temperature of the strip at the outlet of each process section includes: a PID controller calculates a correction amount according to the actual temperature of the strip and the target temperature of the strip at the outlet of each process section, and a PLC controller increases or decreases the target temperature of each control area based on the correction amount.

5. The temperature control method according to claim 4, characterized in that: Each of the process sections has its corresponding process equipment; Correcting the actual temperature of each control area according to the actual temperature of the control area and the corresponding target temperature of the control area includes: a PID controller calculates power values ​​of all the control areas according to the actual temperature of the control area and the corresponding target temperature of the control area, and a PLC controller controls the power output of the process equipment corresponding to each process section based on the power value to correct the actual temperature of each control area.

6. The temperature control method according to claim 1, characterized in that: The outlet and inlet of the annealing furnace are respectively provided with a tension roller group, each tension roller group includes two tension rollers, and the two tension rollers are used to cooperate to tension the strip steel; the speed difference between the two tension rollers can be reduced to reduce the tension of the strip steel.

7. The temperature control method according to claim 6, characterized in that: The outlet and the inlet of the annealing furnace are both provided with tension meters, and the tension meters are used to measure the tension of the steel strip.

8. An annealing furnace temperature control system, characterized in that: include: A plurality of process sections for heat treating the steel strip, wherein the steel strip is used to be continuously transported in the plurality of process sections in sequence, and each of the process sections includes a plurality of control areas; a thermocouple disposed in each of the control regions; A pyrometer is provided at the outlet of each process section to measure the actual temperature of the strip at the outlet of each process section; A controller for executing the temperature control method according to any one of claims 1 to 7.

9. A computer storage medium, characterized in that: The method comprises a memory and a processor, wherein the memory is suitable for storing computer instructions, and the processor is suitable for executing the temperature control method according to any one of claims 1 to 7 when running the computer instructions.

10. A computer program product, characterized in that The method comprises a computer program / instruction, which implements the temperature control method according to any one of claims 1 to 7 when executed by a processor.

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