Strip steel continuous annealing plate temperature control method and device

Abstract

The application provides a strip steel continuous annealing plate temperature control method and device, and relates to the technical field of control. The method comprises the following steps: determining a control parameter, and determining a plate temperature control target of a next nominal transition state according to the control parameter; the control parameter comprises a control mode and a control precision corresponding to the control mode; determining a current coil transition target temperature according to the plate temperature control target of the next nominal transition state, production environment parameters and a preset furnace temperature and plate temperature relationship model; and issuing the current coil transition target temperature to a control system, so that the control system controls the strip steel continuous annealing plate temperature in a dynamic transition stage according to the current coil transition target temperature. The device executes the above method. The strip steel continuous annealing plate temperature control method and device provided in the application can improve the plate temperature control precision.

Description

Technical Field

[0001] This invention relates to the field of control technology, specifically to a method and device for controlling the temperature of strip steel continuous annealing. Background Technology

[0002] Cold-rolled strip steel is a widely used cold-rolled product with high quality requirements, and improving its quality has always been a research hotspot. The main production process of cold-rolled strip steel includes cold rolling, pickling, galvanizing, and annealing. Continuous annealing, as one of the important steps in the production process of cold-rolled strip steel, can effectively improve the product quality of the strip steel.

[0003] With the widespread adoption and application of continuous annealing furnaces, and the increasing demands for product quality from downstream industries, strip temperature control in continuous annealing has gradually become an indispensable part of continuous annealing production lines. Considering the multiple couplings in the heat exchange between the strip and the heating furnace during the annealing process, and the inability to actively control the preheating section, improving the accuracy of strip temperature control has become an urgent problem to be solved.

[0004] Because a preheating section exists during the annealing process, and the temperature of the preheating section is not actively controlled but determined by the residual heat of the heating section, the accuracy of the preheating section directly affects the calculation accuracy of the model. The temperature of the preheating section is affected by various parameters such as production speed, furnace temperature, and strip steel, making it difficult to establish a complete database. Moreover, existing control methods only achieve steady-state control of the strip steel continuous annealing temperature, which cannot meet the requirements of high-precision control. Summary of the Invention

[0005] To address the problems in the prior art, embodiments of the present invention provide a method and apparatus for controlling the temperature of strip steel continuous annealing, which can at least partially solve the problems existing in the prior art.

[0006] On the one hand, this invention proposes a method for controlling the temperature of strip steel continuous annealing, comprising:

[0007] Determine the control parameters, and based on the control parameters, determine the plate temperature control target for the next nominal transition state; the control parameters include the control mode and its corresponding control precision;

[0008] The target temperature for the current roll transition is determined based on the plate temperature control target for the next roll's nominal transition state, production environment parameters, and the preset furnace temperature and plate temperature relationship model.

[0009] The current coil transition target temperature is sent to the control system so that the control system can dynamically control the strip annealing temperature during the transition phase based on the current coil transition target temperature.

[0010] The control mode includes a pre-maintenance control mode; correspondingly, determining the plate temperature control target for the next nominal transition state based on the control parameters includes:

[0011] The control precision corresponding to the pre-control mode is determined as a preset range value for the current roll temperature to be lower than the target temperature and a preset range value for the current roll temperature to be higher than the target temperature.

[0012] The plate temperature control target for the nominal transition state of the next coil is determined based on the preset range of the current coil's temperature being lower than the target temperature, the preset range of the current coil's temperature being higher than the target temperature, the real-time value of the plate temperature control target for the nominal transition state of the next coil, the strip steel target temperature of the current coil, and the strip steel target temperature of the next coil.

[0013] The step of determining the nominal transition temperature control target for the next coil based on the preset range of the current coil's temperature being lower than the target temperature, the preset range of the current coil's temperature being higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, the target temperature of the strip steel for the current coil, and the target temperature of the strip steel for the next coil includes:

[0014] Based on the target temperature of the current coil strip, the preset range by which the current coil can be lower than the target temperature and the preset range by which the current coil can be higher than the target temperature, the upper and lower limit ranges of the nominal plate temperature control target are determined.

[0015] The plate temperature control target for the nominal transition state of the next coil is limited to the upper and lower limit range of the nominal plate temperature control target, and the smaller value between the real-time value of the plate temperature control target for the nominal transition state of the next coil and the target temperature of the strip steel of the next coil is taken as the plate temperature control target for the nominal transition state of the next coil.

[0016] The control mode includes a post-maintenance control mode; correspondingly, determining the plate temperature control target for the next nominal transition state based on the control parameters includes:

[0017] The control precision corresponding to the post-control mode is determined as a preset range value that the next roll can be lower than the target temperature, and a preset range value that the next roll can be higher than the target temperature.

[0018] The nominal transition temperature control target for the next coil is determined based on the preset range of the next coil's temperature being lower than the target temperature, the preset range of the next coil's temperature being higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, and the target temperature of the strip steel for the next coil.

[0019] The step of determining the nominal transition temperature control target for the next coil based on the preset range value of the next coil being lower than the target temperature, the preset range value of the next coil being higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, and the target temperature of the strip steel for the next coil includes:

[0020] Based on the target temperature of the next coil of strip, a preset range by which the next coil can be lower than the target temperature, and a preset range by which the next coil can be higher than the target temperature, the upper and lower limit ranges of the nominal plate temperature control target are determined.

[0021] The plate temperature control target for the nominal transition state of the next coil is limited to the upper and lower limit range of the nominal plate temperature control target, and the smaller value between the real-time value of the plate temperature control target for the nominal transition state of the next coil and the target temperature of the strip steel of the next coil is taken as the plate temperature control target for the nominal transition state of the next coil.

[0022] The control mode includes an average control mode; correspondingly, the strip continuous annealing temperature control method further includes:

[0023] The average of the target temperature of the strip in the current coil and the target temperature of the strip in the next coil is used as the nominal transition temperature control target for the next coil.

[0024] Specifically, based on the plate temperature control target for the next roll's nominal transition state, production environment parameters, and a preset furnace temperature-plate temperature relationship model, the current roll's transition target temperature is determined, including:

[0025] In the preheating section, the end plate temperature under known furnace temperature conditions is calculated based on the preset furnace temperature and plate temperature relationship model.

[0026] In the heating section, the furnace temperature in the heating section is calculated based on the preheating section end plate temperature, the preset furnace temperature and the plate temperature relationship model. If it is determined that the comparison result of the heating section end plate temperature calculated based on the furnace temperature condition and the plate temperature control target of the next roll nominal transition state is less than the preset error accuracy value, then the preset furnace temperature correction value is used to correct the previous furnace temperature to obtain the target furnace temperature.

[0027] In the heating section, the end plate temperature of the heating section is calculated based on the target furnace temperature, the preset furnace temperature and the plate temperature relationship model, under the known furnace temperature conditions, and the calculated end plate temperature of the heating section is used as the current roll transition target temperature.

[0028] The method for controlling the temperature of the steel continuous annealing plate also includes:

[0029] If it is determined that the comparison result of the calculated plate temperature at the end of the heating section obtained from the furnace temperature conditions and the plate temperature control target of the nominal transition state of the next roll is greater than or equal to the preset error accuracy value, then the previous furnace temperature is corrected using the preset furnace temperature correction value, and the calculation of the updated plate temperature at the end of the heating section obtained from the corrected furnace temperature conditions continues. The comparison result of the updated plate temperature at the end of the heating section and the plate temperature control target of the nominal transition state of the next roll is determined until the comparison result is less than the preset error accuracy value.

[0030] On one hand, the present invention proposes a strip continuous annealing plate temperature control device, comprising:

[0031] The first determining unit is used to determine the control parameters and, based on the control parameters, determine the plate temperature control target for the next nominal transition state; the control parameters include the control mode and the corresponding control precision.

[0032] The second determining unit is used to determine the current roll transition target temperature based on the plate temperature control target of the next roll nominal transition state, production environment parameters, and the preset furnace temperature and plate temperature relationship model.

[0033] The control unit is used to send the current coil transition target temperature to the control system, so that the control system can control the strip continuous annealing temperature dynamically according to the current coil transition target temperature.

[0034] In another aspect, embodiments of the present invention provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the following method:

[0035] Determine the control parameters, and based on the control parameters, determine the plate temperature control target for the next nominal transition state; the control parameters include the control mode and its corresponding control precision;

[0036] The target temperature for the current roll transition is determined based on the plate temperature control target for the next roll's nominal transition state, production environment parameters, and the preset furnace temperature and plate temperature relationship model.

[0037] The current coil transition target temperature is sent to the control system so that the control system can dynamically control the strip annealing temperature during the transition phase based on the current coil transition target temperature.

[0038] This invention provides a computer-readable storage medium, comprising:

[0039] The computer-readable storage medium stores a computer program that, when executed by a processor, implements the following method:

[0040] Determine the control parameters, and based on the control parameters, determine the plate temperature control target for the next nominal transition state; the control parameters include the control mode and its corresponding control precision;

[0041] The target temperature for the current roll transition is determined based on the plate temperature control target for the next roll's nominal transition state, production environment parameters, and the preset furnace temperature and plate temperature relationship model.

[0042] The current coil transition target temperature is sent to the control system so that the control system can dynamically control the strip annealing temperature during the transition phase based on the current coil transition target temperature.

[0043] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the following method:

[0044] Determine the control parameters, and based on the control parameters, determine the plate temperature control target for the next nominal transition state; the control parameters include the control mode and its corresponding control precision;

[0045] The target temperature for the current roll transition is determined based on the plate temperature control target for the next roll's nominal transition state, production environment parameters, and the preset furnace temperature and plate temperature relationship model.

[0046] The current coil transition target temperature is sent to the control system so that the control system can dynamically control the strip annealing temperature during the transition phase based on the current coil transition target temperature.

[0047] The strip annealing continuous annealing temperature control method and apparatus provided in this invention determine control parameters and, based on the control parameters, determine the strip temperature control target for the nominal transition state of the next coil. The control parameters include a control mode and its corresponding control precision. Based on the strip temperature control target for the nominal transition state of the next coil, production environment parameters, and a preset furnace temperature and strip temperature relationship model, the current coil transition target temperature is determined. The current coil transition target temperature is sent to the control system, so that the control system can dynamically control the strip temperature during the continuous annealing phase based on the current coil transition target temperature, thereby improving the strip temperature control precision. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0049] Figure 1This is a schematic flowchart of a strip continuous annealing temperature control method provided in an embodiment of the present invention.

[0050] Figure 2 This is a flowchart illustrating a strip annealing temperature control method according to another embodiment of the present invention.

[0051] Figure 3 This is a schematic diagram illustrating the operating conditions of the strip continuous annealing plate provided in an embodiment of the present invention.

[0052] Figure 4 This is a schematic diagram of the structure of a strip steel continuous annealing temperature control device provided in an embodiment of the present invention.

[0053] Figure 5 This is a schematic diagram of the physical structure of a computer device provided in an embodiment of the present invention. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other.

[0055] Figure 1 This is a flowchart illustrating a method for controlling the temperature of strip steel continuous annealing according to an embodiment of the present invention, as shown below. Figure 1 As shown, the strip continuous annealing temperature control method provided in this embodiment of the invention includes:

[0056] Step S1: Determine the control parameters, and determine the plate temperature control target for the next nominal transition state based on the control parameters; the control parameters include the control mode and the corresponding control precision.

[0057] Step S2: Determine the current roll transition target temperature based on the plate temperature control target of the next roll's nominal transition state, production environment parameters, and the preset furnace temperature and plate temperature relationship model.

[0058] Step S3: Send the current coil transition target temperature to the control system so that the control system can dynamically control the strip annealing temperature according to the current coil transition target temperature.

[0059] In step S1 above, the device determines control parameters and, based on these parameters, determines the target plate temperature control for the next nominal transition state. The control parameters include the control mode and its corresponding control precision. The device can be a computer device, such as a server, that executes this method. The acquisition, storage, use, and processing of data in this application comply with relevant national laws and regulations. The control mode is explained below:

[0060] (1) Pre-protection control mode

[0061] The focus is on ensuring the control accuracy of the previous roll. If the control system is adjusted to the upper and lower limits of the previous roll and the adjustment accuracy of the next roll is still not met, no further adjustment will be made.

[0062] (2) Post-protection control mode

[0063] The focus is on ensuring the control accuracy of the next roll. If the control system is adjusted to the upper and lower limits of the next roll and the adjustment accuracy of the previous roll is still not met, no further adjustment will be made.

[0064] (3) Average control mode

[0065] Taking into account the control precision of both volumes, they can only be used when production is stable.

[0066] The control accuracy is explained as follows:

[0067] Based on the process requirements, the maximum upper temperature limit and the minimum lower temperature limit corresponding to different strip steel are determined. The control accuracy corresponding to the pre-protection control mode is the preset range value that the current coil can be lower than the target temperature and the preset range value that the current coil can be higher than the target temperature.

[0068] The control precision corresponding to the post-control mode is a preset range value for the next roll to be lower than the target temperature and a preset range value for the next roll to be higher than the target temperature. The preset range value can be set independently according to the actual situation, for example, 10%.

[0069] like Figure 2 As shown, the control mode includes a pre-maintenance control mode; correspondingly, the plate temperature control target for determining the nominal transition state of the next roll (corresponding to) is determined according to the control parameters. Figure 2 The nominal plate temperature control includes:

[0070] The control precision corresponding to the pre-control mode is determined as a preset range value for the current roll temperature to be lower than the target temperature and a preset range value for the current roll temperature to be higher than the target temperature; please refer to the above description.

[0071] Based on the preset range of the current coil's temperature being lower than the target temperature, the preset range of the current coil's temperature being higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, the target temperature of the strip steel for the current coil, and the target temperature of the strip steel for the next coil, the nominal transition temperature of the next coil is determined. The determination of the nominal transition temperature control target for the next coil based on the preset range of the current coil's temperature being lower than the target temperature, the preset range of the current coil's temperature being higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, the target temperature of the strip steel for the current coil, and the target temperature of the strip steel for the next coil includes:

[0072] Based on the target temperature of the current coil strip, a preset range by which the current coil can be below the target temperature, and a preset range by which the current coil can be above the target temperature, the upper and lower limit ranges of the nominal plate temperature control target are determined; the upper and lower limit ranges of the nominal plate temperature control target can be determined according to the following formula:

[0073] Nominal plate temperature control target upper and lower limit range = [T_Target] [Now] -MinValue [Now] ,T_Target [Now] +MaxValue [Now]

[0074] Among them, T_Target [Now] This indicates the target temperature of the strip in the current coil. Its specific value is determined by the corresponding process conditions, and the unit is °C.

[0075] MinValue [Now] This indicates the preset range at which the current roll can be kept below the target temperature. If the target temperature is 500 degrees, this value is generally 490 or a value determined by other requirements. It can be called the lower limit of the temperature, in degrees Celsius.

[0076] MaxValue [Now] This indicates the preset temperature range that the current temperature can exceed the target temperature. If the target temperature is 500, this value is generally 510 or a value determined by other requirements; this can be called the upper temperature limit. The unit is °C.

[0077] The nominal transition temperature control target for the next coil is limited to the upper and lower limits of the nominal transition temperature control target range. The smaller of the real-time value of the nominal transition temperature control target for the next coil and the target temperature of the strip steel for the next coil is taken as the nominal transition temperature control target for the next coil. That is, the nominal transition temperature control target T_Target for the next coil. [Trans] The temperature must not exceed the upper and lower limits of the nominal plate temperature control target mentioned above; the specific value must be the minimum value, Min[Target]. [Trans] ,T_Target [Next]];in:

[0078] Target [Trans] This represents the real-time value of the plate temperature control target for the next nominal transition state.

[0079] T_Target [Next] This indicates the target temperature for the next roll of strip.

[0080] The control mode includes a post-maintenance control mode; correspondingly, determining the plate temperature control target for the next nominal transition state based on the control parameters includes:

[0081] The control precision corresponding to the post-control mode is determined as a preset range value for the next roll to be lower than the target temperature and a preset range value for the next roll to be higher than the target temperature; please refer to the above description.

[0082] The nominal transition temperature control target for the next coil is determined based on a preset range value for the next coil's temperature to be lower than the target temperature, a preset range value for the next coil's temperature to be higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, and the target temperature of the strip steel for the next coil. The determination of the nominal transition temperature control target for the next coil, based on the preset range value for the next coil's temperature to be lower than the target temperature, the preset range value for the next coil's temperature to be higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, and the target temperature of the strip steel for the next coil, includes:

[0083] Based on the target temperature of the next coil of strip, a preset range by which the next coil can be lower than the target temperature, and a preset range by which the next coil can be higher than the target temperature, the upper and lower limit ranges of the nominal plate temperature control target are determined; the upper and lower limit ranges of the nominal plate temperature control target can be determined according to the following formula:

[0084] Nominal plate temperature control target upper and lower limit range = [T_Target] [Next] -MinValue [Next] ,T_Target [Next] +MaxValue [Next] ]

[0085] Among them, T_Target [Next] This indicates the target temperature for the next coil of strip. The specific value is determined by the corresponding process conditions, and the unit is °C.

[0086] MinValue [Next] This indicates the preset range at which the next roll can be kept below the target temperature. If the target temperature is 500 degrees, this value is generally 490 or a value determined by other requirements. It can be called the lower limit of the temperature, in degrees Celsius.

[0087] MinValue [Next]This indicates the preset temperature range at which the next roll can exceed the target temperature. If the target value is 500, this value is typically 510, or a value determined by other requirements; this can be called the upper temperature limit. The unit is °C.

[0088] The nominal transition temperature control target for the next coil is limited to the upper and lower limits of the nominal transition temperature control target range. The smaller of the real-time value of the nominal transition temperature control target for the next coil and the target temperature of the strip steel for the next coil is taken as the nominal transition temperature control target for the next coil. That is, the nominal transition temperature control target T_Target for the next coil. [Trans] The temperature must not exceed the upper and lower limits of the nominal plate temperature control target mentioned above; the specific value must be the minimum value, Min[Target]. [Trans] ,T_Target [Next] ];in:

[0089] Target [Trans] This represents the real-time value of the plate temperature control target for the next nominal transition state.

[0090] T_Target [Next] This indicates the target temperature for the next roll of strip.

[0091] The control mode includes an average control mode; correspondingly, the strip continuous annealing plate temperature control method further includes:

[0092] The average of the target temperature of the strip in the current coil and the target temperature of the strip in the next coil is used as the nominal transition temperature control target for the next coil.

[0093] That is, the plate temperature control target T_Target for the next nominal transition state. [Trans] =(T_Target [Next] +T_Target [Now] ) / 2;

[0094] T_Target [Next] Indicates the target temperature for the next roll of strip;

[0095] T_Target [Now] This indicates the target temperature of the strip in the current coil.

[0096] Referring to the above description, the control parameters may also include the real-time value of the strip temperature control target for the nominal transition state of the next coil, the target temperature of the strip in the current coil, and the target temperature of the strip in the next coil.

[0097] In step S2 above, the device determines the current roll transition target temperature based on the plate temperature control target of the next roll nominal transition state, production environment parameters, and a preset furnace temperature and plate temperature relationship model.

[0098] The preset furnace temperature and plate temperature relationship model can be an existing model, as detailed below:

[0099] Both the heating and cooling stages in a heating furnace involve radiative heat transfer and convective heat transfer processes.

[0100] The formula is

[0101]

[0102] In the formula: Q f This represents the energy exchanged due to radiative heat transfer, expressed in kilocalories per hour.

[0103] C L This represents the combined emissivity of the strip steel and the heating furnace, expressed in kcal / m². 2 ·Time·K 4 ;

[0104] T g T b This indicates the average temperature of the heating furnace and steel strip, in Kelvin (K).

[0105] F g This indicates the working area of ​​the strip steel, in meters. 2 ;

[0106] dt is the heat exchange time, expressed in hours.

[0107] Q d =η·v 0.89 ·C0·(t g -t b )·F g (2) Where: Q d This represents the energy exchanged due to heat convection, expressed in kilocalories per hour.

[0108] η represents the protective gas correction factor, which is dimensionless;

[0109] v represents velocity; in the heating section, it is the strip velocity, and in the cooling section, it is the wind speed of the cooling gas in m / s.

[0110] The C0 equipment correction factor is a constant for a specific production environment and is dimensionless.

[0111] t g t b This indicates the average temperature of the heating furnace and steel strip, in °C.

[0112] F g This indicates the working area of ​​the strip steel, in meters. 2 .

[0113] Based on the heat transfer principles of the steel industry furnace design manual, the above formula was determined. Simultaneously, the corresponding equipment correction factor C0 and radiation factor C were determined using actual production data from the field. L The formulas for determining the heating furnace temperature and strip temperature are completed.

[0114] According to the laws of thermodynamics, we have the following formula:

[0115] Q f +Q d =C×M×(t) out -t in (3)

[0116] In the formula: Q represents the sum of the energy exchanged due to radiation heat transfer and the energy exchanged due to heat convection, in kcal / h;

[0117] C represents specific heat capacity, measured in kilocalories per kg × K.

[0118] M represents the mass of the heated strip steel, in kg, which can be calculated by volume × density.

[0119] t out The temperature (t) represents the temperature of the strip after heating. in This indicates the temperature of the strip before it is heated.

[0120] Production environment parameters, i.e. operating conditions, such as Figure 3 As shown, the operating conditions are described below:

[0121] The strip steel passes through the preheating and heating sections. The furnace temperature T_Furset is measured by thermocouples in different sections. The closed-loop control system for the furnace temperature also relies on these corresponding thermocouples for control. Since the temperature in the preheating section is obtained through the recirculation of exhaust gas from the heating section, plate temperature gauges are generally not installed in the preheating and heating sections. Figure 3 In the process, the first plate thermometer for the strip is located at the outlet of the heating section. T_Strip1 to T_Strip8 represent the temperatures of the strip in eight temperature ranges. Only T_Strip8 is the actual temperature measured by the plate thermometer, while the other seven are values ​​in the model and are not known in reality.

[0122] T_In represents the initial temperature of the strip before it enters the heating furnace;

[0123] T_Strip1~8 represent the actual strip temperatures at the exit of the 8 temperature ranges, respectively;

[0124] T_Furset1~8 represent the temperatures inside the furnace in the eight temperature ranges, respectively;

[0125] T_Target is T_Target [Trans] This indicates the plate temperature control target for the next nominal transition state.

[0126] 1. The plate temperature can be calculated using a preset furnace temperature and plate temperature relationship model, given the furnace temperature. The explanation is as follows:

[0127] Based on the relationship model determined by the above formulas (1)-(3), the strip temperature at which the strip exits the heating furnace can be calculated according to the given furnace temperature conditions.

[0128] According to the relational model, the entire control process (the time the strip is in the heating furnace, i.e. the heating time) is divided into steps (1000 time steps per second, without specific limitation). Each step is calculated using different heat transfer coefficients (convective heat transfer and radiative heat transfer) and energy value formulas (1) and (2). The calculation results are then substituted into formula (3) to calculate the outlet temperature (where the initial inlet temperature is the indoor temperature). The outlet temperature is then used as the inlet temperature of the next step. Finally, the strip temperature at the corresponding furnace temperature during the heating time dt can be obtained through iteration, i.e., the plate temperature.

[0129] During the calculation, all parameters except the outlet temperature were known.

[0130] 2. The furnace temperature can be calculated from a pre-set furnace temperature and plate temperature relationship model, given the plate temperature. The explanation is as follows:

[0131] If the furnace temperature is known, then by giving an initial furnace temperature (an empirical value), the plate temperature can be calculated. Through iterative algorithm, the furnace temperature corresponding to the plate temperature can be obtained.

[0132] The specific calculation process is as follows: Assume an initial furnace temperature (which can be given empirically). Then, using the initial furnace temperature and the relevant content on solving for the plate temperature based on the known furnace temperature, the corresponding plate temperature t_last can be calculated. The furnace temperature correction value F is then:

[0133] F = μ(t_last - T_Target), where μ is a correction coefficient. When t_last = T_Target, the furnace temperature calculated at this time is the final furnace temperature obtained.

[0134] The furnace temperature correction value F can be used to determine the starting furnace temperature calculation conditions in the next iteration process. The furnace temperature correction value F can be added directly to the original furnace temperature.

[0135] Based on the plate temperature control target for the nominal transition state of the next roll, production environment parameters, and the preset furnace temperature and plate temperature relationship model, determine the current roll's transition target temperature, including:

[0136] In the preheating section, the end plate temperature under known furnace temperature conditions is calculated based on the preset furnace temperature and plate temperature relationship model.

[0137] In the heating section, the furnace temperature in the heating section is calculated based on the preheating section end plate temperature, the preset furnace temperature and the plate temperature relationship model. If it is determined that the comparison result of the heating section end plate temperature calculated based on the furnace temperature condition and the plate temperature control target of the next roll nominal transition state is less than the preset error accuracy value, then the preset furnace temperature correction value is used to correct the previous furnace temperature to obtain the target furnace temperature.

[0138] In the heating section, the end plate temperature of the heating section is calculated based on the target furnace temperature, the preset furnace temperature and the plate temperature relationship model, under the known furnace temperature conditions, and the calculated end plate temperature of the heating section is used as the current roll transition target temperature.

[0139] The steel annealing plate temperature control method also includes:

[0140] If it is determined that the comparison result of the calculated plate temperature at the end of the heating section obtained from the furnace temperature conditions and the plate temperature control target of the nominal transition state of the next roll is greater than or equal to the preset error accuracy value, then the previous furnace temperature is corrected using the preset furnace temperature correction value, and the calculation of the updated plate temperature at the end of the heating section obtained from the corrected furnace temperature conditions continues. The comparison result of the updated plate temperature at the end of the heating section and the plate temperature control target of the nominal transition state of the next roll is determined until the comparison result is less than the preset error accuracy value.

[0141] Combination Figure 3 The iterative calculation process described above is explained as follows:

[0142] In the preheating section, given the furnace temperature, the plate temperature is calculated, with the objective being T_Strip4 (plate temperature at the end of the preheating section).

[0143] T_Strip4 can be obtained by solving the above formulas (1)-(3).

[0144] Given T_Strip4 in the heating section, calculate the furnace temperature T_Furset5-8.

[0145] Set the initial furnace temperature of T_Furset5-8, which can be selected as 500-800°;

[0146] The first iteration calculates the plate temperature, using T_Strip4 as the initial t. in Calculate the plate temperatures corresponding to T_Furset5-8 according to the above formulas (1)-(3), where T_Strip8 in the first iteration is denoted as T_Strip81. Calculate the relationship between T_Strip81 and T_Target. [Trans] The difference is then used to obtain F according to the above calculation formula. F is used to correct the furnace temperature. The furnace temperature correction value for the first iteration is denoted as T_Furset51-81 (F is added for 500-800° respectively).

[0147] The second iteration calculates the plate temperature, using T_Strip4 as the initial t. in Calculate the plate temperatures corresponding to T_Furset51-81 according to the above formulas (1)-(3), where T_Strip8 in the second iteration is denoted as T_Strip82. Calculate the relationship between T_Strip82 and T_Target. [Trans] The difference is then used to obtain F according to the above calculation formula. F is used to correct the furnace temperature. The furnace temperature correction value in the second iteration is denoted as T_Furset52-82 (F is added to furset51-81 respectively).

[0148] And so on, calculating the board temperature in the i-th iteration until T_Strip8i equals T_Target. [Trans] If the difference is less than the preset error accuracy value, the previous furnace temperature T_Furset5(i-1)-8(i-1) is corrected using this time F to obtain the accurate furnace temperature (target furnace temperature) T_Furset5i-8i.

[0149] Given T_Furset5i-8i in the heating section, calculate the plate temperature, i.e., the current roll transition target temperature T_Target. [Trans _ Now] .

[0150] Based on the above formulas (1)-(3), T_Strip8 (temperature at the end of the heating section) can be calculated:

[0151] Use T_Strip4 as the initial t in Select a preset time step, which is the same as the time step value when T_Strip4 is solved according to the above formulas (1)-(3). Calculate the strip heating temperature under furnace temperatures T_Furset5i-8i in sequence until T_Strip8 is calculated. Take T_Strip8 at this time as the current coil transition target temperature T_Target. [Trans _ Now] .

[0152] It should be noted that during the calculation of each time step mentioned above, the strip speed is kept constant, i.e., Speed [Next] and Speed [Now] To maintain consistency, due to the strip width. [Next] , strip thickness [Next] The change of ...

[0153] Furthermore, the method of the present invention performs local optimization calculations based on the comparison between the calculated plate temperature at the end of the heating section and the plate temperature control target of the nominal transition state of the next roll, rather than recalculating globally from the control start point to the control end point, which can effectively reduce control errors.

[0154] In step S3 above, the device sends the current coil transition target temperature to the control system, so that the control system can dynamically control the strip annealing temperature during the transition phase based on the current coil transition target temperature. Figure 2 As shown, the parameters (steady-state parameters and transient parameters) in the control output are all target values ​​for the plate temperature, specifically including:

[0155] (1) Current steady-state control parameters of the strip steel;

[0156] (2) Transition state control parameters (when the next coil of steel is about to enter the strip furnace);

[0157] (3) Steady-state control parameters for the next roll of steel.

[0158] The values ​​of (1) and (3) can be directly determined by the annealing target curve based on the steel grade. The control parameter of (2) is the current coil transition target temperature to be solved.

[0159] Throughout the entire variable specification control process, parameters (1)-(3) in the control are issued in advance. Parameter (1) is used when the current roll is heating, and transition parameter (2) is used when the next roll is about to enter the heating stage. The timing of parameter change is determined by the primary control system based on the magnitude of the adjustment, ensuring that the next roll completes the issuance of transition parameter (2) and achieves the control target before entering the heating furnace. After the next roll enters the heating furnace, control parameter (3) is used.

[0160] Specifically, the calculated target temperature for the current coil transition can be sent to the primary control system, which will then adjust the furnace temperature to control the dynamic change of specifications during the continuous annealing of the strip.

[0161] The beneficial effects of the strip annealing temperature control method provided in this embodiment of the invention are as follows:

[0162] By using local optimization and closed-loop plate temperature control, dynamic variable specification control of strip plate temperature is achieved. Compared with the control method of controlling plate temperature through furnace temperature, this reduces the impact of the plate temperature-heating furnace heat exchange model accuracy on control accuracy and reduces the impact of the preheating section furnace temperature, which cannot be actively controlled, on the overall dynamic variable specification control.

[0163] The strip annealing temperature control method provided in this invention determines control parameters and, based on these parameters, determines the nominal transition temperature control target for the next coil. The control parameters include a control mode and its corresponding control precision. Based on the nominal transition temperature control target for the next coil, production environment parameters, and a preset furnace temperature-plate temperature relationship model, the current coil's transition target temperature is determined. The current coil's transition target temperature is then sent to the control system, enabling the control system to dynamically control the strip annealing temperature during the transition phase, thereby improving the strip annealing temperature control precision.

[0164] Furthermore, the control mode includes a pre-maintenance control mode; correspondingly, determining the board temperature control target for the next roll nominal transition state based on the control parameters includes:

[0165] The control precision corresponding to the pre-control mode is determined as a preset range value for the current roll temperature to be lower than the target temperature and a preset range value for the current roll temperature to be higher than the target temperature; please refer to the above description, and it will not be repeated here.

[0166] Based on the preset range of the current coil's temperature being lower than the target temperature, the preset range of the current coil's temperature being higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, the target temperature of the strip steel for the current coil, and the target temperature of the strip steel for the next coil, the nominal transition temperature control target for the next coil is determined. This can be referred to the above explanation and will not be repeated here.

[0167] Further, determining the nominal transition temperature control target for the next coil based on the preset range of the current coil's temperature being lower than the target temperature, the preset range of the current coil's temperature being higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, the target strip temperature of the current coil, and the target strip temperature of the next coil includes:

[0168] Based on the target temperature of the current coil strip, the preset range by which the current coil can be below the target temperature, and the preset range by which the current coil can be above the target temperature, the upper and lower limit ranges of the nominal plate temperature control target are determined; the above description is provided and will not be repeated here.

[0169] The nominal transition temperature control target for the next coil is limited to the upper and lower limit ranges of the nominal transition temperature control target, and the smaller value between the real-time value of the nominal transition temperature control target for the next coil and the target temperature of the strip steel for the next coil is taken as the nominal transition temperature control target for the next coil. This can be referred to the above explanation and will not be repeated here.

[0170] Furthermore, the control mode includes a post-maintenance control mode; correspondingly, determining the plate temperature control target for the next nominal transition state based on the control parameters includes:

[0171] The control precision corresponding to the post-control mode is determined as a preset range value for the next roll to be lower than the target temperature and a preset range value for the next roll to be higher than the target temperature; please refer to the above description, which will not be repeated here.

[0172] The nominal transition temperature control target for the next coil is determined based on the preset range of the next coil's temperature being lower than the target temperature, the preset range of the next coil's temperature being higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, and the target temperature of the strip steel for the next coil. This can be referred to the above explanation and will not be repeated here.

[0173] Further, determining the nominal transition temperature control target for the next coil based on the preset range value for the next coil being lower than the target temperature, the preset range value for the next coil being higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, and the target temperature of the strip steel for the next coil includes:

[0174] The upper and lower limit ranges of the nominal plate temperature control target are determined based on the target temperature of the next coil, the preset range by which the next coil can be lower than the target temperature, and the preset range by which the next coil can be higher than the target temperature; the above description is provided and will not be repeated here.

[0175] The nominal transition temperature control target for the next coil is limited to the upper and lower limit ranges of the nominal transition temperature control target, and the smaller value between the real-time value of the nominal transition temperature control target for the next coil and the target temperature of the strip steel for the next coil is taken as the nominal transition temperature control target for the next coil. This can be referred to the above explanation and will not be repeated here.

[0176] Furthermore, the control mode includes an average control mode; correspondingly, the strip continuous annealing temperature control method further includes:

[0177] The average of the target strip temperature of the current coil and the target strip temperature of the next coil is used as the nominal transition temperature control target for the next coil. This can be referred to the above explanation and will not be repeated here.

[0178] Furthermore, based on the plate temperature control target for the next roll's nominal transition state, production environment parameters, and the preset furnace temperature and plate temperature relationship model, the current roll's transition target temperature is determined, including:

[0179] In the preheating section, the end plate temperature of the preheating section is calculated based on the preset furnace temperature and plate temperature relationship model under known furnace temperature conditions; please refer to the above explanation, which will not be repeated here.

[0180] In the heating section, the furnace temperature in the heating section is calculated based on the preheating section end plate temperature, the preset furnace temperature, and the plate temperature relationship model under known plate temperature conditions. If it is determined that the calculated result of the heating section end plate temperature obtained based on the furnace temperature conditions is less than the preset error accuracy value when compared with the plate temperature control target of the nominal transition state of the next roll, the previous furnace temperature is corrected using the preset furnace temperature correction value to obtain the target furnace temperature. The above description is provided and will not be repeated here.

[0181] In the heating section, the end plate temperature under known furnace temperature conditions is calculated based on the target furnace temperature, the preset furnace temperature, and the plate temperature relationship model. The calculated end plate temperature is then used as the current roll transition target temperature. This can be referred to the above explanation and will not be repeated here.

[0182] Furthermore, the steel continuous annealing plate temperature control method also includes:

[0183] If the calculated plate temperature at the end of the heating section, obtained from the furnace temperature conditions, is found to be greater than or equal to the preset error accuracy value when compared with the plate temperature control target for the nominal transition state of the next roll, then the previous furnace temperature is corrected using the preset furnace temperature correction value. The process continues, calculating the updated plate temperature at the end of the heating section based on the corrected furnace temperature conditions, and comparing the updated plate temperature at the end of the heating section with the plate temperature control target for the nominal transition state of the next roll, until the comparison result is less than the preset error accuracy value. This can be referred to the above explanation and will not be repeated here.

[0184] Figure 4 This is a schematic diagram of the structure of a strip annealing temperature control device provided in an embodiment of the present invention, as shown below. Figure 4 As shown, the strip annealing temperature control device provided in this embodiment of the invention includes a first determining unit 401, a second determining unit 402, and a control unit 403, wherein:

[0185] The first determining unit 401 is used to determine control parameters and, based on the control parameters, determine the plate temperature control target for the nominal transition state of the next coil; the control parameters include the control mode and the corresponding control precision; the second determining unit 402 is used to determine the current coil transition target temperature based on the plate temperature control target for the nominal transition state of the next coil, production environment parameters, and a preset furnace temperature and plate temperature relationship model; the control unit 403 is used to send the current coil transition target temperature to the control system so that the control system can dynamically control the strip annealing plate temperature during the transition stage based on the current coil transition target temperature.

[0186] Specifically, the first determining unit 401 in the device is used to determine control parameters and determine the plate temperature control target for the nominal transition state of the next coil based on the control parameters; the control parameters include the control mode and the corresponding control precision; the second determining unit 402 is used to determine the current coil transition target temperature based on the plate temperature control target for the nominal transition state of the next coil, production environment parameters, and a preset furnace temperature and plate temperature relationship model; the control unit 403 is used to send the current coil transition target temperature to the control system so that the control system can control the strip steel continuous annealing plate temperature dynamically during the transition stage based on the current coil transition target temperature.

[0187] The strip annealing temperature control device provided in this embodiment of the invention determines control parameters and, based on the control parameters, determines the strip temperature control target for the nominal transition state of the next coil. The control parameters include a control mode and its corresponding control precision. Based on the strip temperature control target for the nominal transition state of the next coil, production environment parameters, and a preset furnace temperature and strip temperature relationship model, the current coil transition target temperature is determined. The current coil transition target temperature is sent to the control system, so that the control system can dynamically control the strip temperature during the transition stage based on the current coil transition target temperature, thereby improving the strip temperature control precision during continuous annealing.

[0188] The embodiments of the present invention provide a strip steel continuous annealing plate temperature control device that can be used to execute the processing flow of the above method embodiments. Its function will not be repeated here, but can be referred to the detailed description of the above method embodiments.

[0189] Figure 5 This is a schematic diagram of the physical structure of a computer device provided in an embodiment of the present invention, such as... Figure 5 As shown, the computer device includes: a memory 501, a processor 502, and a computer program stored in the memory 501 and executable on the processor 502. When the processor 502 executes the computer program, it implements the following method:

[0190] Determine the control parameters, and based on the control parameters, determine the plate temperature control target for the next nominal transition state; the control parameters include the control mode and its corresponding control precision;

[0191] The target temperature for the current roll transition is determined based on the plate temperature control target for the next roll's nominal transition state, production environment parameters, and the preset furnace temperature and plate temperature relationship model.

[0192] The current coil transition target temperature is sent to the control system so that the control system can dynamically control the strip annealing temperature during the transition phase based on the current coil transition target temperature.

[0193] This embodiment discloses a computer program product, which includes a computer program that, when executed by a processor, implements the following method:

[0194] Determine the control parameters, and based on the control parameters, determine the plate temperature control target for the next nominal transition state; the control parameters include the control mode and its corresponding control precision;

[0195] The target temperature for the current roll transition is determined based on the plate temperature control target for the next roll's nominal transition state, production environment parameters, and the preset furnace temperature and plate temperature relationship model.

[0196] The current coil transition target temperature is sent to the control system so that the control system can dynamically control the strip annealing temperature during the transition phase based on the current coil transition target temperature.

[0197] This embodiment provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the following method:

[0198] Determine the control parameters, and based on the control parameters, determine the plate temperature control target for the next nominal transition state; the control parameters include the control mode and its corresponding control precision;

[0199] The target temperature for the current roll transition is determined based on the plate temperature control target for the next roll's nominal transition state, production environment parameters, and the preset furnace temperature and plate temperature relationship model.

[0200] The current coil transition target temperature is sent to the control system so that the control system can dynamically control the strip annealing temperature during the transition phase based on the current coil transition target temperature.

[0201] Compared with existing technologies, this invention determines control parameters and, based on these parameters, determines the plate temperature control target for the nominal transition state of the next coil. The control parameters include a control mode and its corresponding control precision. Based on the plate temperature control target for the nominal transition state of the next coil, production environment parameters, and a preset furnace temperature and plate temperature relationship model, the current coil's transition target temperature is determined. The current coil's transition target temperature is then sent to the control system, enabling the control system to dynamically control the strip steel continuous annealing temperature during the transition phase, thereby improving the strip steel continuous annealing temperature control precision.

[0202] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0203] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0204] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0205] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0206] In the description of this specification, the references to terms such as "an embodiment," "a specific embodiment," "some embodiments," "for example," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0207] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling the temperature of strip steel continuous annealing, characterized in that, include: Determine the control parameters, and based on the control parameters, determine the plate temperature control target for the next nominal transition state; the control parameters include the control mode and its corresponding control precision; The target temperature for the current roll transition is determined based on the plate temperature control target for the next roll's nominal transition state, production environment parameters, and the preset furnace temperature and plate temperature relationship model. The current coil transition target temperature is sent to the control system so that the control system can dynamically control the strip annealing temperature according to the current coil transition target temperature. The control mode includes a pre-maintenance control mode; correspondingly, determining the plate temperature control target for the next nominal transition state based on the control parameters includes: The control precision corresponding to the pre-control mode is determined as a preset range value for the current roll temperature to be lower than the target temperature and a preset range value for the current roll temperature to be higher than the target temperature. Based on the preset range value of the current coil being lower than the target temperature, the preset range value of the current coil being higher than the target temperature, the real-time value of the nominal transition state plate temperature control target for the next coil, the strip steel target temperature of the current coil, and the strip steel target temperature of the next coil, the plate temperature control target for the nominal transition state of the next coil is determined. The step of determining the nominal transition temperature control target for the next coil based on the preset range of the current coil's temperature being lower than the target temperature, the preset range of the current coil's temperature being higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, the target temperature of the strip steel for the current coil, and the target temperature of the strip steel for the next coil includes: Based on the target temperature of the current coil strip, the preset range by which the current coil can be lower than the target temperature and the preset range by which the current coil can be higher than the target temperature, the upper and lower limit ranges of the nominal plate temperature control target are determined. The plate temperature control target of the next coil nominal transition state is limited to the upper and lower limit range of the nominal plate temperature control target, and the smaller value between the real-time value of the plate temperature control target of the next coil nominal transition state and the target temperature of the strip steel of the next coil is taken as the plate temperature control target of the next coil nominal transition state. Based on the plate temperature control target for the nominal transition state of the next roll, production environment parameters, and the preset furnace temperature and plate temperature relationship model, determine the current roll's transition target temperature, including: In the preheating section, the end plate temperature under known furnace temperature conditions is calculated based on the preset furnace temperature and plate temperature relationship model. In the heating section, the furnace temperature in the heating section is calculated based on the preheating section end plate temperature, the preset furnace temperature and the plate temperature relationship model. If it is determined that the comparison result of the heating section end plate temperature calculated based on the furnace temperature condition and the plate temperature control target of the next roll nominal transition state is less than the preset error accuracy value, then the preset furnace temperature correction value is used to correct the previous furnace temperature to obtain the target furnace temperature. In the heating section, the end plate temperature of the heating section is calculated based on the target furnace temperature, the preset furnace temperature and the plate temperature relationship model, under the known furnace temperature conditions, and the calculated end plate temperature of the heating section is used as the current roll transition target temperature; The steel annealing plate temperature control method also includes: If it is determined that the comparison result of the calculated plate temperature at the end of the heating section obtained from the furnace temperature conditions and the plate temperature control target of the nominal transition state of the next roll is greater than or equal to the preset error accuracy value, then the previous furnace temperature is corrected using the preset furnace temperature correction value, and the calculation of the updated plate temperature at the end of the heating section obtained from the corrected furnace temperature conditions continues. The comparison result of the updated plate temperature at the end of the heating section and the plate temperature control target of the nominal transition state of the next roll is determined until the comparison result is less than the preset error accuracy value.

2. The strip annealing temperature control method according to claim 1, characterized in that, The control mode includes a post-maintenance control mode; correspondingly, determining the plate temperature control target for the next nominal transition state based on the control parameters includes: The control precision corresponding to the post-control mode is determined as a preset range value that the next roll can be lower than the target temperature, and a preset range value that the next roll can be higher than the target temperature. The nominal transition temperature control target for the next coil is determined based on the preset range of the next coil's temperature being lower than the target temperature, the preset range of the next coil's temperature being higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, and the target temperature of the strip steel for the next coil.

3. The strip annealing temperature control method according to claim 2, characterized in that, The step of determining the nominal transition temperature control target for the next coil based on the preset range value of the next coil being lower than the target temperature, the preset range value of the next coil being higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, and the target temperature of the strip steel for the next coil includes: Based on the target temperature of the next coil of strip, a preset range by which the next coil can be lower than the target temperature, and a preset range by which the next coil can be higher than the target temperature, the upper and lower limit ranges of the nominal plate temperature control target are determined. The plate temperature control target for the nominal transition state of the next coil is limited to the upper and lower limit range of the nominal plate temperature control target, and the smaller value between the real-time value of the plate temperature control target for the nominal transition state of the next coil and the target temperature of the strip steel of the next coil is taken as the plate temperature control target for the nominal transition state of the next coil.

4. The strip annealing temperature control method according to claim 3, characterized in that, The control mode includes an average control mode; correspondingly, the strip continuous annealing plate temperature control method further includes: The average of the target temperature of the strip in the current coil and the target temperature of the strip in the next coil is used as the nominal transition temperature control target for the next coil.

5. A strip steel continuous annealing plate temperature control device, characterized in that, include: The first determining unit is used to determine the control parameters and, based on the control parameters, determine the plate temperature control target for the next nominal transition state; the control parameters include the control mode and the corresponding control precision. The second determining unit is used to determine the current roll transition target temperature based on the plate temperature control target of the next roll nominal transition state, production environment parameters, and the preset furnace temperature and plate temperature relationship model. The control unit is used to send the current coil transition target temperature to the control system, so that the control system can control the strip annealing temperature in a dynamic transition phase according to the current coil transition target temperature. The control mode includes a pre-protection control mode; correspondingly, the first determining unit is specifically used for: The control precision corresponding to the pre-control mode is determined as a preset range value for the current roll temperature to be lower than the target temperature and a preset range value for the current roll temperature to be higher than the target temperature. Based on the preset range value of the current coil being lower than the target temperature, the preset range value of the current coil being higher than the target temperature, the real-time value of the nominal transition state plate temperature control target for the next coil, the strip steel target temperature of the current coil, and the strip steel target temperature of the next coil, the plate temperature control target for the nominal transition state of the next coil is determined. The step of determining the nominal transition temperature control target for the next coil based on the preset range of the current coil's temperature being lower than the target temperature, the preset range of the current coil's temperature being higher than the target temperature, the real-time value of the nominal transition temperature control target for the next coil, the target temperature of the strip steel for the current coil, and the target temperature of the strip steel for the next coil includes: Based on the target temperature of the current coil strip, the preset range by which the current coil can be lower than the target temperature and the preset range by which the current coil can be higher than the target temperature, the upper and lower limit ranges of the nominal plate temperature control target are determined. The plate temperature control target of the next coil nominal transition state is limited to the upper and lower limit range of the nominal plate temperature control target, and the smaller value between the real-time value of the plate temperature control target of the next coil nominal transition state and the target temperature of the strip steel of the next coil is taken as the plate temperature control target of the next coil nominal transition state. The second determining unit is specifically used for: In the preheating section, the end plate temperature under known furnace temperature conditions is calculated based on the preset furnace temperature and plate temperature relationship model. In the heating section, the furnace temperature in the heating section is calculated based on the preheating section end plate temperature, the preset furnace temperature and the plate temperature relationship model. If it is determined that the comparison result of the heating section end plate temperature calculated based on the furnace temperature condition and the plate temperature control target of the next roll nominal transition state is less than the preset error accuracy value, then the preset furnace temperature correction value is used to correct the previous furnace temperature to obtain the target furnace temperature. In the heating section, the end plate temperature of the heating section is calculated based on the target furnace temperature, the preset furnace temperature and the plate temperature relationship model, under the known furnace temperature conditions, and the calculated end plate temperature of the heating section is used as the current roll transition target temperature; The steel strip annealing plate temperature control device is also used for: If it is determined that the comparison result of the calculated plate temperature at the end of the heating section obtained from the furnace temperature conditions and the plate temperature control target of the nominal transition state of the next roll is greater than or equal to the preset error accuracy value, then the previous furnace temperature is corrected using the preset furnace temperature correction value, and the calculation of the updated plate temperature at the end of the heating section obtained from the corrected furnace temperature conditions continues. The comparison result of the updated plate temperature at the end of the heating section and the plate temperature control target of the nominal transition state of the next roll is determined until the comparison result is less than the preset error accuracy value.

6. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method of any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method of any one of claims 1 to 4.

8. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method of any one of claims 1 to 4.

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