Steel rolling heating furnace control method, device, equipment and storage medium

Abstract

This invention relates to the field of steel rolling technology, specifically disclosing a method, apparatus, equipment, and storage medium for controlling a steel rolling heating furnace. The method includes: acquiring the material and position parameters of a steel billet; calculating the temperature distribution and heat exchange capacity of the heating furnace; calculating the temperature distribution of the steel billet using the material and position parameters, as well as the temperature distribution and heat exchange capacity of the heating furnace; and adjusting the air-fuel ratio of the heating furnace according to the temperature distribution of the steel billet. The steel rolling heating furnace control method proposed in this invention collects and predicts the heating process of the steel billet, calculates the temperature of the steel billet at different positions in the heating furnace, predicts temperature changes, and controls the combustion status of the heating furnace, thereby achieving the purpose of saving fuel consumption and reducing oxidation loss.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, and in particular to a method, apparatus, equipment and storage medium for controlling a steel rolling heating furnace. Background Technology

[0002] In the metallurgical industry, heating furnaces are used to heat steel billets to the rolling and forging temperatures. Currently, the various systems of these furnaces are manually adjusted. Operators manually adjust valve openings based on the actual furnace temperature to heat the billets. On-site operation requires constant manual monitoring of temperature changes. If temperature fluctuations are not addressed promptly, the temperature will exceed the set process range, affecting the heating quality of the billets. Fluctuations in gas pressure make it impossible to accurately control the air-fuel ratio, resulting in energy waste and an unstable furnace atmosphere, further exacerbating the oxidation and burning loss of the billets. Purely manual combustion control also causes significant furnace pressure fluctuations. Excessive furnace pressure leads to heat loss, while insufficient pressure draws in cold air, increasing energy consumption.

[0003] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main objective of this invention is to provide a method, apparatus, equipment, and storage medium for controlling a steel rolling heating furnace, which aims to solve the problem that manual on-site operation of the heating furnace cannot accurately control the air-fuel ratio, resulting in energy waste and unstable furnace atmosphere.

[0005] To achieve the above objectives, the present invention provides a method for controlling a steel rolling heating furnace, the method comprising the following steps:

[0006] Obtain the material and position parameters of the steel billet;

[0007] Calculate the temperature distribution and heat exchange capacity of the heating furnace;

[0008] The temperature distribution of the steel billet is calculated using the material and position parameters of the steel billet, as well as the temperature distribution and heat exchange capacity of the heating furnace.

[0009] The air-fuel ratio of the heating furnace is adjusted according to the temperature distribution of the steel billet.

[0010] Optionally, the steps of obtaining the material parameters and position parameters of the steel billet include:

[0011] Receive planned data from the production information management system;

[0012] Verify the planned data against the actual steel billet to obtain the material parameters of the steel billet;

[0013] Acquire the steel loading action signal and the walking beam action signal;

[0014] The position parameters of the billet are calculated using the material parameters of the billet, the loading action signal, and the walking beam action signal.

[0015] Optionally, the step of calculating the temperature distribution and heat exchange capacity of the heating furnace includes:

[0016] Obtain measured data of thermocouples inside the heating furnace and calculate the temperature distribution of the heating furnace;

[0017] Obtain the operating parameters of the heating furnace and calculate the heat exchange capacity of the steel billet in the furnace.

[0018] Optionally, after the step of calculating the temperature distribution of the steel billet using the material parameters and position parameters of the steel billet, as well as the temperature distribution and heat exchange capacity of the heating furnace, the method further includes:

[0019] Set the heating parameters for the steel billet;

[0020] Based on the heating parameters and the material parameters of the steel billet, the heating regime of the steel billet in the heating section is calculated.

[0021] Optionally, after the step of calculating the temperature distribution of the steel billet using the material parameters and position parameters of the steel billet, as well as the temperature distribution and heat exchange capacity of the heating furnace, the method further includes:

[0022] Set the heating parameters for the mixed steel billets;

[0023] Based on the heating parameters and material parameters of the mixed steel billets, the heating regime of the mixed steel billets in the heating section is calculated.

[0024] Optionally, the step of adjusting the air-fuel ratio of the heating furnace according to the temperature distribution of the steel billet includes:

[0025] By comparing the furnace temperature with the preset temperature value, the fuel flow rate and air flow rate are controlled, thereby adjusting the air-fuel ratio of the furnace.

[0026] By comparing the concentrations of O2 and CO with preset concentration values, the fuel flow rate and air flow rate are controlled, thereby adjusting the air-fuel ratio of the heating furnace.

[0027] Optionally, after the step of calculating the temperature distribution of the steel billet using the material parameters and position parameters of the steel billet, as well as the temperature distribution and heat exchange capacity of the heating furnace, the method further includes: calculating the oxidation loss value of the steel billet.

[0028] Furthermore, to achieve the above objectives, the present invention also proposes a control device for a steel rolling heating furnace, the device comprising:

[0029] The billet parameter acquisition module is used to acquire the material parameters and position parameters of the billet.

[0030] The furnace calculation module is used to calculate the temperature distribution and heat exchange capacity of the furnace.

[0031] The billet temperature calculation module is used to calculate the temperature distribution of the billet using the material parameters and position parameters of the billet, as well as the temperature distribution and heat exchange capacity of the heating furnace.

[0032] The heating furnace adjustment module is used to adjust the air-fuel ratio of the heating furnace according to the temperature distribution of the steel billet.

[0033] Furthermore, to achieve the above objectives, the present invention also proposes a steel rolling heating furnace control device, the device comprising: a memory, a processor, and a steel rolling heating furnace control program stored in the memory and executable on the processor, the steel rolling heating furnace control program being configured to implement the steps of the steel rolling heating furnace control method described above.

[0034] In addition, to achieve the above objectives, the present invention also proposes a storage medium storing a steel rolling furnace control program, wherein when the steel rolling furnace control program is executed by a processor, it implements the steps of the steel rolling furnace control method described above.

[0035] The technical solution of this invention obtains the material and position parameters of the steel billet; calculates the temperature distribution and heat exchange capacity of the heating furnace; uses the material and position parameters of the steel billet, as well as the temperature distribution and heat exchange capacity of the heating furnace, to calculate the temperature distribution of the steel billet; and adjusts the air-fuel ratio of the heating furnace according to the temperature distribution of the steel billet. The steel rolling heating furnace control method proposed in this invention collects and predicts the heating process of the steel billet, calculates the temperature of the steel billet at different positions in the heating furnace and predicts temperature changes, and controls the combustion status of the heating furnace, thereby achieving the purpose of saving fuel consumption and reducing oxidation loss. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the steel rolling heating furnace control equipment in the hardware operating environment involved in the embodiments of the present invention;

[0037] Figure 2 This is a flowchart illustrating the first embodiment of the steel rolling furnace control method of the present invention;

[0038] Figure 3 This is a flowchart illustrating the second embodiment of the steel rolling furnace control method of the present invention;

[0039] Figure 4 This is a flowchart illustrating the third embodiment of the steel rolling furnace control method of the present invention;

[0040] Figure 5 This is a flowchart illustrating the fourth embodiment of the steel rolling furnace control method of the present invention;

[0041] Figure 6 This is a structural block diagram of the first embodiment of the steel rolling heating furnace control device of the present invention.

[0042] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0044] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of the steel rolling heating furnace control equipment in the hardware operating environment of the embodiment of the present invention.

[0045] like Figure 1 As shown, the steel rolling furnace control device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen and an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wireless-Fidelity (Wi-Fi) interface). The memory 1005 may be high-speed random access memory (RAM) or stable non-volatile memory (NVM), such as a disk storage device. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0046] Those skilled in the art will understand that Figure 1 The structure shown does not constitute a limitation on the control equipment for the steel rolling furnace, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0047] like Figure 1 As shown, the memory 1005, which serves as a storage medium, may include an operating system, a network communication module, a user interface module, and a steel rolling furnace control program.

[0048] exist Figure 1 In the rolling mill heating furnace control device shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and memory 1005 in the rolling mill heating furnace control device of the present invention can be set in the rolling mill heating furnace control device. The rolling mill heating furnace control device calls the rolling mill heating furnace control program stored in the memory 1005 through the processor 1001 and executes the rolling mill heating furnace control method provided in the embodiment of the present invention.

[0049] This invention provides a method for controlling a steel rolling heating furnace, referring to... Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of the steel rolling heating furnace control method of the present invention.

[0050] In this embodiment, the steel rolling heating furnace control method includes the following steps:

[0051] Step S10: Obtain the material parameters and position parameters of the steel billet.

[0052] It should be noted that the implementing entity of this method can be a computing service device (such as a mobile phone, tablet computer, personal computer, etc.) with data processing, network communication, and program execution functions, or an electronic device capable of performing the same or similar functions, such as the aforementioned steel rolling furnace control device. This embodiment and the following embodiments will be described using the aforementioned steel rolling furnace control device as an example.

[0053] It should be understood that the material parameters of the steel billet can be parameters related to the billet temperature during the heating process (such as specific heat capacity, thermal conductivity, density, and billet dimensions). During the heating process, a phase transformation from ferrite to austenite occurs in the steel billet. During this phase transformation, the material parameters of the steel billet change significantly. Therefore, it is necessary to predict the amount of austenite transformation during the heating process based on the phase transformation point and the temperature range using kinetic equations, and then determine the changes in specific heat capacity and thermal conductivity.

[0054] Furthermore, the position parameters of the billet are the specific coordinate parameters of the billet within the heating furnace. The process of tracking the position of the billet within the heating furnace can begin from the moment the billet is positioned and loaded into the heating furnace until it exits the furnace onto the exit roller conveyor.

[0055] Step S20: Calculate the temperature distribution and heat exchange capacity of the heating furnace.

[0056] It should be noted that the calculated temperature distribution of the heating furnace refers to the temperature distribution of various preset zones within the furnace. The furnace temperature is not uniform; it can be divided into a preheating section, a heating section, and a soaking section according to the process flow. The temperature of each section is different.

[0057] Furthermore, calculating the heat exchange capacity of the heating furnace involves calculating the heat exchange capacity between the furnace interior and the steel billet, primarily through radiation heat exchange. This is related to factors such as furnace dimensions, steel billet surface temperature, emissivity, and furnace conditions.

[0058] Step S30: Calculate the temperature distribution of the steel billet using the material parameters and position parameters of the steel billet, as well as the temperature distribution and heat exchange capacity of the heating furnace.

[0059] It should be noted that after obtaining the material and location parameters of the steel billet, and calculating the temperature distribution and heat exchange capacity of the heating furnace, the billet temperature can be calculated using the following formula:

[0060]

[0061] Where x and y form a two-dimensional rectangular coordinate system, x represents the length direction of the billet, y represents the thickness direction of the billet, T represents the temperature value, τ represents the time value, λ represents the thermal conductivity, ρ represents the density, and cp represents the specific heat capacity. According to numerical heat transfer, the above formula is processed by finite difference discretization, and the temperature field of the billet can be calculated by computer simulation.

[0062] It should be understood that the heating process of steel billets in the furnace involves complex physicochemical processes such as fuel combustion, gas flow, heat and mass transfer, oxidation loss, and decarburization, and is related to many influencing factors. These include the furnace dimensions and thermal characteristics of the furnace walls, the billet dimensions and thermal properties, the type and calorific value of the fuel, the preheating temperatures of the air and fuel, the air-fuel ratio, the thermal characteristics and movement of the furnace gas, and the movement of the billet itself. Particularly for the lower surface of the billet, heat transfer is complex due to the influence of the furnace bottom, walking beam, and fixed beams. Not only do water beams obstruct the heating of the billet, affecting heat transfer, but the heat transfer efficiency differs between the upper and lower surfaces and the left and right sides of the billet. By periodically running the above formula (e.g., every 10 seconds), the cross-sectional temperature distribution of the billet along its length and thickness at any given moment in the furnace can be calculated in real time.

[0063] Step S40: Adjust the air-fuel ratio of the heating furnace according to the temperature distribution of the steel billet.

[0064] It should be noted that the air-fuel ratio can be the ratio of the mass of air to the mass of fuel in the combustible mixture. A laser analyzer for combustion atmosphere in the furnace is used to detect the O2 and CO content in each section of the furnace in real time to determine the combustion state in the furnace and then adjust the air-fuel ratio in the furnace.

[0065] This embodiment acquires the material and position parameters of the steel billet; calculates the temperature distribution and heat exchange capacity of the heating furnace; uses the material and position parameters of the steel billet, along with the temperature distribution and heat exchange capacity of the heating furnace, to calculate the temperature distribution of the steel billet; and adjusts the air-fuel ratio of the heating furnace according to the temperature distribution of the steel billet. The steel rolling heating furnace control method proposed in this invention collects and predicts the heating process of the steel billet, calculates the temperature of the steel billet at different positions in the heating furnace, predicts temperature changes, and controls the combustion status of the heating furnace, thereby achieving the purpose of saving fuel consumption and reducing oxidation loss.

[0066] refer to Figure 3 , Figure 3 This is a flowchart illustrating the second embodiment of the steel rolling heating furnace control method of the present invention.

[0067] Based on the first embodiment described above, a second embodiment of the present invention for the control method of the steel rolling heating furnace in this embodiment is proposed. In the second embodiment, step S10 further includes:

[0068] Step S101: Receive the planned data issued by the production information management system.

[0069] It should be noted that the planned data issued by the production information management system can be heating furnace PDI data and rolling line PDI data. The PDI data is the data for controlling the positioning and tracking of steel billets, including data such as billet number, temperature and pressure.

[0070] Step S102: Verify the planned data with the actual steel billet to obtain the material parameters of the steel billet.

[0071] It should be noted that the verification methods can be: automatic verification through a billet number image recognition system; verification through length and weight measurement data; automatic matching according to the rolling plan sequence; and manual input. In this embodiment, based on the production line's production habits and scheduling characteristics (strip steel, bar steel, and double-high wire rod), the above-mentioned automatic matching according to the rolling plan sequence is adopted, and manual input is used to manage the rolling plan sequence for manual modification.

[0072] Step S103: Obtain the steel loading action signal and the walking beam action signal.

[0073] It should be noted that, therefore, it is necessary to calculate the specific coordinate position of each billet in the furnace in real time based on the billet size, the charging and unloading action signal, and the movement of the walking beam, and record relevant furnace temperature and short-term data. When a billet enters the furnace, after receiving the charging completion signal, the system adds a billet record to the furnace tracking area. When a billet exits the furnace, upon receiving the unloading action signal, the billet record in the furnace tracking area is deleted and transferred to the unloading history sequence. When the walking beam action signal is received, the material tracking module increases (or decreases) the current step distance for the position of all billets in the furnace tracking area according to the stepping forward (or backward) mode.

[0074] Step S104: Calculate the position parameters of the steel billet using the material parameters of the steel billet, the steel loading action signal, and the walking beam action signal.

[0075] Furthermore, step S20 also includes:

[0076] Step S201: Obtain the measured data of the thermocouples inside the heating furnace and calculate the temperature distribution of the heating furnace.

[0077] It should be noted that the calculation can be based on the measured data of the thermocouples inside the furnace. Multiple temperatures collected by thermocouples are set in each preset area of ​​the heating furnace (including the preheating section, heating section and soaking section of the heating furnace) for calculation. The calculation method can be compensation, regression and interpolation.

[0078] Step S202: Obtain the operating parameters of the heating furnace and calculate the heat exchange capacity of the steel billet in the furnace.

[0079] It should be noted that since the heat exchange process between the steel billet and the heating furnace is affected by many factors and is related to the characteristics of each heating furnace, a black box experiment can be used to determine the model correction coefficient for each heating furnace, and the curve of the change trend of each point along the furnace length can be saved.

[0080] Furthermore, after step S30, the method further includes:

[0081] Step S301: Calculate the oxidation loss value of the steel billet.

[0082] It should be noted that during the heating process of the steel billet in the furnace, the oxidation process involves iron diffusing outward through the oxide layer, while oxidizing gases in the flue gas (such as SO2, O2, H2O, CO2, etc.) diffuse inward through the oxide layer, resulting in a chemical reaction. The oxidation loss rate is mainly affected by factors such as the surface temperature of the steel billet, the furnace atmosphere, and the residence time in the high-temperature zone. The oxidation loss value of the steel billet is calculated using a formula.

[0083]

[0084]

[0085] Where K0 is the steel burning coefficient, A is a constant, T is the temperature value, E is the activation energy, τ is the time value, w is the oxidation loss of the steel billet, the operator exp is the exponential operation with the natural logarithm base e as the base, and δ is the change. K0 is dynamically changing and is related to the concentration of oxidizing gases SO2, O2, H2O, and CO2 in the furnace atmosphere at the current location.

[0086] Step S302: Collect the actual temperature of the billet at the mill inlet and outlet, the temperature of the upper and lower surfaces of the billet after rolling, and the on-site measured burn loss rate of the billet.

[0087] Step S303: Correct the calculated data proportionally based on the deviation between the actual value and the calculated value.

[0088] It should be noted that the deviation between the actual value and the calculated value is related to factors such as billet size, steel grade, furnace temperature distribution, and heating time. Using a neural network algorithm to find the inherent patterns between them can improve the self-learning effect.

[0089] Furthermore, after step S30, the method further includes:

[0090] Step S304: Set the heating parameters for the steel billet.

[0091] It should be noted that, while prioritizing the billet exit temperature and heating quality, the production rhythm requirements of the rolling line should be met as much as possible, while also considering other process requirements such as energy saving and burn-off. The heating parameters for each temperature control target can be configured and modified.

[0092] Step S305: Calculate the heating regime of the steel billet in the heating section based on the heating parameters and the material parameters of the steel billet.

[0093] It should be noted that the design of the heating regime requires comprehensive consideration of factors such as the heating quality of the billet (deviation of the target temperature at the furnace exit and the cross-sectional temperature difference), the allowable heating rate range of each section, the target temperature range of each section, the upper and lower limits of the furnace temperature of each section, the production rhythm and operating energy consumption, etc., to dynamically optimize the furnace temperature setpoint, thereby forming the corresponding ideal heating curve and determining the optimal heating process of the billet.

[0094] It should be understood that the ratio of the heating rates of the billet preheating section to the heating section depends on the furnace output and gas consumption. When the furnace output is high, this ratio needs to be larger; conversely, when the furnace output is low, this ratio can be appropriately reduced. The smaller the ratio of the heating rates of the billet preheating section to the heating section, the more energy-efficient the furnace operation.

[0095] Step S306: Set the heating parameters for the mixed steel billets.

[0096] It should be noted that this can be calculated comprehensively, taking into account factors such as the steel grade of the billet, billet specifications, furnace inlet temperature, target furnace outlet temperature, rolling specifications, furnace position, and requirements for roll changing. For example, for a certain heating section, the billet that leaves this section first has the shortest remaining heating time. Therefore, to meet its requirement for the set furnace temperature in this section as much as possible, its heating parameters should be minimized. When specialty steel and ordinary steel are heated in the same furnace, their heating quality requirements are different, and different heating parameters also need to be considered.

[0097] Step S307: Calculate the heating regime of the mixed steel billet in the heating section based on the heating parameters of the mixed steel billet and the material parameters of the mixed steel billet.

[0098] It should be noted that when different plans are mixed, the steel grades, specifications, and target tapping temperatures may vary greatly between plans. When the steel reaches a certain section of the heating furnace, it is necessary to weigh the heating regime of different steel billets according to different heating sections, based on the steel grade, billet position, empty space position, target temperature, current temperature, and predicted tapping temperature, and calculate the comprehensive heating regime of that section to automatically adjust the furnace temperature.

[0099] This embodiment receives planned data from the production information management system and verifies the planned data against the actual steel billet. It acquires the material parameters of the steel billet and calculates its position parameters by obtaining the loading action signal and the walking beam action signal. By acquiring measured data from thermocouples inside the heating furnace, it calculates the temperature distribution of the furnace; it acquires the operating parameters of the furnace and calculates the heat exchange capacity of the steel billet within the furnace. Furthermore, it calculates the temperature of the steel billet, predicts the trend of steel billet burn-off, and proportionally corrects the calculated data based on the deviation between the actual and calculated values. It also sets heating parameters and heating regimes for various steel billets, thereby designing standard heating regimes and temperature rise curves for different production lines under different rhythms, steel grades, and specifications.

[0100] refer to Figure 4 , Figure 4 This is a flowchart illustrating the third embodiment of the steel rolling furnace control method of the present invention.

[0101] Based on the first embodiment described above, three embodiments of the steel rolling furnace control method of this invention are proposed. In the third embodiment, after step S30, the method further includes:

[0102] Step S50: Select the appropriate heating / cooling and heat preservation strategies based on the different types of shutdown reasons.

[0103] It should be noted that furnace shutdowns generally fall into two categories: one is due to low furnace temperature or insufficient heating time, resulting in billet tapping temperatures that do not meet rolling requirements, thus requiring the furnace to stop tapping steel for necessary cooling or heat preservation operations. Waiting time can be categorized into waiting for temperature adjustment, planned waiting time, and emergency waiting time. During waiting for temperature adjustment, heating is typically intensified rapidly while meeting heating temperature and process temperature requirements, minimizing the waiting time.

[0104] It should be understood that planned furnace standby is generally part of normal production arrangements and the downtime is easily determined, such as maintenance or roll changing. When changing rolls, the system can identify the billet as it enters the furnace, and the model can pre-calculate the standby time when calculating the billet heating regime based on the billet's step-by-step process, thus enabling planned, segmented cooling operations. Sudden furnace standby refers to a sudden production failure that causes a halt; the downtime in this case is not fixed. When sudden furnace standby occurs and the processing time is long, to prevent the billet from being exposed to high temperatures for an extended period from developing an oxide layer, affecting heating quality, and increasing energy consumption, the furnace standby module needs to be activated to perform cooling and heat preservation operations according to the length of the standby period.

[0105] Furthermore, after step S30, the following is also included:

[0106] Step S60: Store and manage data during the operation of the heating furnace.

[0107] It should be noted that at least one year of production history data should be stored for future reference and analysis. The generated historical data includes historical data on the heating process of each steel billet (such as production plan PDI data, furnace temperature setting data, actual furnace temperature data, model calculation data, etc.), as well as team management and energy consumption statistics.

[0108] It should be understood that the system can collect all relevant data and save it to the database after the billet is tapped from the furnace. Furthermore, the human-machine interface of the intelligent combustion system for the heating furnace allows users to query historical production data and product heating process quality data using various filtering criteria such as tapping time, production plan number, and work group. It can also generate and print various reports as needed, such as work group output and energy consumption reports and heating quality reports.

[0109] This embodiment selects appropriate heating, cooling, and heat preservation strategies based on different types of furnace shutdown reasons. It controls the amplitude and rate of temperature changes in each section of the furnace to ensure that the heating quality of the steel billets exiting the furnace after production resumes meets the requirements of the rolling process. By storing and managing data during the furnace operation, historical heating process data can be queried and analyzed, facilitating further process optimization.

[0110] refer to Figure 5 , Figure 5This is a flowchart illustrating the fourth embodiment of the steel rolling heating furnace control method of the present invention.

[0111] Based on the first embodiment described above, four embodiments of the steel rolling furnace control method of the present invention are proposed. In the fourth embodiment, step S40 further includes:

[0112] Step S401: Compare the furnace temperature of the heating furnace with the preset temperature value, control the fuel flow rate and air flow rate, and thereby adjust the air-fuel ratio of the heating furnace.

[0113] It should be noted that the temperatures collected by thermocouples installed in the preheating, heating, and soaking sections of the heating furnace can be compared with preset temperature values. The preset temperature value can be a temperature range; when the furnace temperature is within this preset range, combustion within the heating furnace is in the optimal combustion zone, resulting in the highest thermal efficiency.

[0114] It should be understood that when the collected furnace temperature is higher than the maximum value of the preset temperature range, the fuel flow rate and air flow rate are gradually reduced; when the collected furnace temperature is lower than the minimum value of the preset temperature range, the fuel flow rate and air flow rate are gradually increased.

[0115] Step S402: Compare the concentrations of O2 and CO with preset concentration values, control the fuel flow rate and air flow rate, and thus adjust the air-fuel ratio of the heating furnace.

[0116] It should be noted that a laser combustion analyzer can be used to collect the concentrations of O2 and CO inside the furnace. Three sets of laser combustion analyzers are configured and installed in the preheating section, heating section, and soaking section of the heating furnace, respectively. The preset concentration values ​​can be the values ​​that allow the air-fuel ratio to be set optimally based on the air and fuel flow rates.

[0117] It should be understood that when the temperature of the heating furnace returns to the preset temperature value, the concentrations of O2 and CO are compared. If O2 is excessive, the air flow rate is reduced; if CO is excessive, the fuel flow rate is reduced.

[0118] In this embodiment, the fuel flow rate and air flow rate are controlled by comparing the furnace temperature with a preset temperature value, and by comparing the O2 and CO concentrations with preset concentration values, thereby adjusting the air-fuel ratio of the furnace. Through combustion state detection, dynamic optimization, and cyclic optimization, the air and fuel flow rates are adjusted to achieve the most reasonable air-fuel ratio, ensuring combustion within the furnace is in the optimal combustion zone and maximizing thermal efficiency. The system monitors the current O2 and CO content in real time, compares it with the set O2 and CO content, and adjusts the air-fuel ratio to ensure the residual oxygen concentration in the furnace reaches the target value and stabilizes.

[0119] Furthermore, this embodiment of the invention also proposes a storage medium storing a steel rolling furnace control program, which, when executed by a processor, implements the steps of the steel rolling furnace control method described above.

[0120] Reference Figure 6 , Figure 6 This is a structural block diagram of the first embodiment of the steel rolling heating furnace control device of the present invention.

[0121] like Figure 6 As shown, the steel rolling heating furnace control device proposed in this embodiment of the invention includes:

[0122] The billet parameter acquisition module 601 is used to acquire the material parameters and position parameters of the billet.

[0123] The heating furnace calculation module 602 is used to calculate the temperature distribution and heat exchange capacity of the heating furnace.

[0124] The billet temperature calculation module 603 is used to calculate the temperature distribution of the billet using the material parameters and position parameters of the billet, as well as the temperature distribution and heat exchange capacity of the heating furnace.

[0125] The heating furnace adjustment module 604 is used to adjust the air-fuel ratio of the heating furnace according to the temperature distribution of the steel billet.

[0126] In this embodiment, the billet parameter acquisition module acquires the material and position parameters of the billet; the heating furnace calculation module calculates the temperature distribution and heat exchange capacity of the heating furnace; the billet temperature calculation module uses the billet's material and position parameters, along with the heating furnace's temperature distribution and heat exchange capacity, to calculate the billet's temperature distribution; and the heating furnace adjustment module adjusts the air-fuel ratio of the heating furnace based on the billet's temperature distribution. Because this embodiment collects and predicts data on the billet's heating process, calculates the temperature of the billet at different locations in the heating furnace, and predicts temperature changes, it controls the combustion status of the heating furnace, thereby achieving the goals of saving fuel consumption and reducing oxidation loss.

[0127] Based on the first embodiment of the steel rolling furnace control device of the present invention, a second embodiment of the steel rolling furnace control device of the present invention is proposed.

[0128] In this embodiment, the billet parameter acquisition module 601 is also used to receive planning data issued by the production information management system; verify the planning data with the actual billet to obtain the material parameters of the billet; acquire the loading action signal and the walking beam action signal; and use the material parameters of the billet, the loading action signal and the walking beam action signal to calculate the position parameters of the billet.

[0129] Furthermore, the heating furnace calculation module 602 is also used to acquire measured data of thermocouples inside the heating furnace, calculate the temperature distribution of the heating furnace, acquire the operating parameters of the heating furnace, and calculate the heat exchange capacity of the steel billet inside the furnace.

[0130] Furthermore, the billet temperature calculation module 603 is also used to collect the actual temperature of the billet at the mill inlet and outlet, as well as the temperature of the upper and lower surfaces of the billet after rolling, after calculating the temperature distribution of the billet, and to correct the calculated data proportionally according to the deviation between the actual value and the calculated value.

[0131] Furthermore, the billet temperature calculation module 603 is also used to calculate the billet oxidation loss value; collect the actual billet temperature at the mill inlet and outlet, the upper and lower surface temperatures of the billet after rolling, and the on-site measured loss rate of the billet; and correct the calculated data proportionally based on the deviation between the actual value and the calculated value.

[0132] Furthermore, the billet temperature calculation module 603 is also used to set the heating parameters of the billet; and to calculate the heating regime of the billet in the heating section based on the heating parameters and the material parameters of the billet.

[0133] Furthermore, the billet temperature calculation module 603 is also used to set the heating parameters of the mixed billets; and to calculate the heating regime of the mixed billets in the heating section based on the heating parameters of the mixed billets and the material parameters of the mixed billets.

[0134] Furthermore, the heating furnace adjustment module 604 is also used to compare the furnace temperature with a preset temperature value, control the fuel flow rate and air flow rate, and thereby adjust the air-fuel ratio of the heating furnace; and to compare the concentrations of O2 and CO with preset concentration values, control the fuel flow rate and air flow rate, and thereby adjust the air-fuel ratio of the heating furnace.

[0135] Furthermore, the aforementioned steel rolling furnace control device also includes:

[0136] The furnace standby management module 605 is used to select the appropriate heating, cooling, and insulation strategies based on different types of furnace shutdown reasons.

[0137] The data management module 606 is used to store and manage data during the operation of the heating furnace.

[0138] Other embodiments or specific implementations of the steel rolling heating furnace control device of the present invention can be referred to the above-described method embodiments, and will not be repeated here.

[0139] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0140] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0141] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory / random access memory, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0142] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for controlling a steel rolling heating furnace, characterized in that, The control method for the steel rolling heating furnace includes: Obtain the material and position parameters of the steel billet; Calculate the temperature distribution and heat exchange capacity of the heating furnace; The temperature distribution of the steel billet is calculated using the material and position parameters of the steel billet, as well as the temperature distribution and heat exchange capacity of the heating furnace. The air-fuel ratio of the heating furnace is adjusted according to the temperature distribution of the steel billet; The steps for calculating the temperature distribution and heat exchange capacity of the heating furnace include: Obtain measured data of thermocouples inside the heating furnace and calculate the temperature distribution of the heating furnace; Obtain the operating parameters of the heating furnace and calculate the heat exchange capacity of the steel billet in the furnace; The step of calculating the temperature distribution of the steel billet using the material parameters and position parameters of the steel billet, as well as the temperature distribution and heat exchange capacity of the heating furnace, further includes: Calculate the oxidation loss value of the steel billet; The actual temperatures of the billets at the mill inlet and outlet, the temperatures of the upper and lower surfaces of the billets after rolling, and the on-site measured burn-off rate of the billets were collected. The temperature distribution of the steel billet is corrected proportionally based on the deviation between the actual collected values ​​and the oxidation loss values.

2. The method for controlling a steel rolling heating furnace as described in claim 1, characterized in that, The steps for obtaining the material parameters and position parameters of the steel billet include: Receive planned data from the production information management system; Verify the planned data against the actual steel billet to obtain the material parameters of the steel billet; Acquire the steel loading action signal and the walking beam action signal; The position parameters of the billet are calculated using the material parameters of the billet, the loading action signal, and the walking beam action signal.

3. The method for controlling a steel rolling heating furnace as described in claim 2, characterized in that, The step of calculating the temperature distribution of the steel billet using the material parameters and position parameters of the steel billet, as well as the temperature distribution and heat exchange capacity of the heating furnace, further includes: Set the heating parameters for the steel billet; Based on the heating parameters and the material parameters of the steel billet, the heating regime of the steel billet in the heating section is calculated.

4. The method for controlling a steel rolling heating furnace as described in claim 3, characterized in that, The step of calculating the temperature distribution of the steel billet using the material parameters and position parameters of the steel billet, as well as the temperature distribution and heat exchange capacity of the heating furnace, further includes: Set the heating parameters for the mixed steel billets; Based on the heating parameters and material parameters of the mixed steel billets, the heating regime of the mixed steel billets in the heating section is calculated.

5. The method for controlling a steel rolling heating furnace as described in claim 4, characterized in that, The step of adjusting the air-fuel ratio of the heating furnace according to the temperature distribution of the steel billet includes: By comparing the furnace temperature with the preset temperature value, the fuel flow rate and air flow rate are controlled, thereby adjusting the air-fuel ratio of the furnace. By comparing the concentrations of O2 and CO with preset concentration values, the fuel flow rate and air flow rate are controlled, thereby adjusting the air-fuel ratio of the heating furnace.

6. A control device for a steel rolling heating furnace, characterized in that, The device includes: The billet parameter acquisition module is used to acquire the material parameters and position parameters of the billet. The furnace calculation module is used to calculate the temperature distribution and heat exchange capacity of the furnace. The billet temperature calculation module is used to calculate the temperature distribution of the billet using the material parameters and position parameters of the billet, as well as the temperature distribution and heat exchange capacity of the heating furnace. A heating furnace adjustment module is used to adjust the air-fuel ratio of the heating furnace according to the temperature distribution of the steel billet; The furnace calculation module is also used to acquire measured data of thermocouples inside the furnace, calculate the temperature distribution of the furnace, acquire the operating parameters of the furnace, and calculate the heat exchange capacity of the steel billet inside the furnace. The heating furnace calculation module is also used to calculate the oxidation loss value of the steel billet; collect the actual temperature of the steel billet at the mill inlet and outlet, the temperature of the upper and lower surfaces of the steel billet after rolling, and the on-site measured burn loss rate of the steel billet; and correct the temperature distribution of the steel billet proportionally based on the deviation between the collected actual values ​​and the oxidation loss value.

7. A control device for a steel rolling heating furnace, characterized in that, The device includes: a memory, a processor, and a rolling mill heating furnace control program stored in the memory and executable on the processor, the rolling mill heating furnace control program being configured to implement the steps of the rolling mill heating furnace control method as described in any one of claims 1 to 5.

8. A storage medium, characterized in that, The storage medium stores a steel rolling furnace control program, which, when executed by a processor, implements the steps of the steel rolling furnace control method as described in any one of claims 1 to 5.

Images