A control method for automatic adjustment of the full-length temperature of a slab based on a full-field-of-view temperature measuring instrument

Abstract

A control method for automatic temperature adjustment of the entire length of a slab based on a full-field-of-view thermometer belongs to the field of control. The full-field-of-view thermometer in the furnace collects the visible surface radiation spectrum of the heated slab to obtain the real-time distribution of the slab surface temperature; obtains the temperature difference control target value M1 of the head of the slab and the temperature difference control target value M2 of the tail; issues the temperature setting values ​​of the upper left, middle and right sections of the soaking section; combines the current slab calculation temperature, furnace gas temperature, and the remaining furnace time predicted under the current rolling rhythm, calculates the predicted values ​​of the slab head, middle and tail temperatures of the next model calculation cycle, and calculates the deviation △t between the predicted value and the process requirement value; sets the temperature of the upper left, middle and right control zones of the soaking section, thereby achieving the purpose of automatically controlling the temperature of the head, middle and tail of the slab, and then realizing the automatic control function of the temperature furnace in the full length direction of the slab. The temperature control function in the full length direction of the slab can be realized, and the uniformity of the temperature control of the full length of the slab can be improved. It can be widely used in the field of temperature process control of heating furnaces.

Description

Technical Field

[0001] The invention belongs to the field of automatic control, and in particular relates to an automatic control method for the temperature of a heating furnace. Background Art

[0002] The full-length uniformity of the hot-rolled slab is the most important quality indicator for evaluating the operation of the heating furnace, and is also one of the key factors affecting the microstructure and properties of the hot-rolled strip.

[0003] However, traditional combustion control cannot obtain the key parameter of billet surface temperature distribution online in real time. It can only use the furnace temperature measured by the thermocouple in the furnace as a reference (not the temperature of the heated billet) and perform simulated calculations through the control computer of the heating furnace.

[0004] Therefore, for the temperature control of the slab, especially the temperature control along the entire length of the slab, there is a certain deviation between the actual temperature distribution and the actual situation. At the same time, for control, the operator can only judge the full-length uniformity of the slab in the furnace through the full-length temperature curve of the intermediate slab after the slab is rough rolled out of the furnace, so there is a serious hysteresis, which is not conducive to pre-judgment and adjustment.

[0005] After searching, the patents related to the automatic control of the full-length temperature of the slab are mainly:

[0006] The Chinese invention patent with the authorization announcement date of August 17, 2021 and the authorization announcement number of CN110617903B discloses "a method for detecting the surface temperature of a hot rolling heating furnace slab". It installs a dual-optical high-temperature camera on the discharge side, measures the temperature of the entire length of the slab by adjusting the angle, and obtains accurate data on the slab surface; through the information exchange between the laser detector, the heating furnace model control system, and the temperature measurement system, the surface temperature of the slab before leaving the furnace is confirmed and the data is archived, so that the surface temperature of the slab can be accurately measured, the heating quality of the slab surface can be improved, and the quality control risk of the subsequent process can be reduced. The method used in this technical solution is to measure the temperature after leaving the furnace, which cannot be controlled in the furnace, and there is no function to control the temperature of the slab in the length direction.

[0007] The Chinese invention patent application with the application publication date of December 1, 2020 and the application publication number CN112013690 A discloses "a comprehensive control method for slabs entering a hot rolling heating furnace", which includes the following steps: S1, verifying the slab weight related data; S2, verifying the slab measured temperature data; S3, verifying the slab length related data; S4, verifying the slab width related data. This solution can not only effectively improve the accuracy and rationality of the slabs entering the hot rolling heating furnace, ensure the accuracy of the slab information entering the furnace, but also play a certain role in the subsequent rolling line production control, fully ensure the rationality of each slab entering the furnace, and has great use value. This technical solution mainly measures the temperature distribution of the slab entering the furnace, and also does not have the function of controlling the temperature of the slab in the length direction.

[0008] The Chinese invention patent application with application publication date of December 1, 2020 and application publication number CN 112013690 A discloses "a method for determining the temperature of a slab in a hot rolling heating furnace", which includes the following steps: S1. Verify the slab weight related data; S2. Verify the slab measured temperature data; S3. Verify the slab length related data; S4. Verify the slab width related data. This solution can not only effectively improve the accuracy and rationality of the slabs entering the hot rolling heating furnace, ensure the accuracy of the slab information entering the furnace, but also play a certain role in the subsequent rolling line production control, fully ensure the rationality of each slab entering the furnace, and has great use value. This technical solution mainly calculates the heating model, cannot measure the slab temperature in the furnace, and also does not have the function of controlling the temperature of the slab in the length direction. Summary of the invention

[0009] The technical problem to be solved by the present invention is to provide a control method for automatic adjustment of the full-length temperature of a slab based on a full-field-of-view thermometer. The full-length temperature distribution of the slab before entering the soaking section is measured by using the full-field-of-view thermometer in the furnace, and the relevant data is uploaded to L2, which automatically retrieves the full-length temperature control specification of the slab, compares it with the current full-length temperature measured by the full-field-of-view thermometer, and sets the temperature of the three control areas on the left, middle and right of the upper part of the soaking section (corresponding to the head, middle and tail of the slab) in combination with the current steel extraction rhythm, thereby achieving the purpose of automatically controlling the head, middle and tail temperatures of the slab, and further realizing the automatic control function of the temperature of the slab in the full-length direction of the furnace.

[0010] The technical solution of the present invention is to provide a control method for automatically adjusting the temperature of a slab over its entire length based on a full-field-of-view thermometer, comprising controlling and adjusting the temperature of a heating furnace by detecting the temperature of the slab, and is characterized in that:

[0011] 1) At least one set of full-field temperature measuring instrument in the furnace is provided to obtain real-time video images of the working conditions in the heating furnace and infrared radiation spectrum of the heated slab to realize slab temperature monitoring;

[0012] 2) Analyze and process the digital image signals collected by the full-field thermometer in the furnace, analyze the visible surface radiation spectrum of the heated slab, calculate the full-length surface temperature of the slab, and accurately obtain the real-time distribution of the slab surface temperature; and upload the data to L2 of the heating furnace;

[0013] 3) Follow the steps below to control the temperature of the slab along its entire length:

[0014] S1: The slab enters the heating furnace, and L2 automatically indexes the temperature control principle in the length direction of the slab according to the current steel-out mark, the slab contract number, and whether the hot coil box index item is used, and obtains the temperature difference control target value M1 at the head of the slab and the temperature difference control target value M2 at the tail;

[0015] S2: After the slab enters the soaking section, the full-field temperature measuring instrument in the furnace uploads the temperature distribution data of the entire length of the slab to L2 of the heating furnace;

[0016] S3: L2 analyzes and processes the uploaded measured slab full-length temperature data. The specific steps of the analysis and processing include at least:

[0017] a) Analyze the temperature detection values ​​of the entire length of the slab and remove abnormal points;

[0018] b) According to the number of temperature measurement points along the entire length of the slab, the average of the points close to 1 / 3 of the slab side is taken as the temperature t2 of the slab tail, the average of the points close to 1 / 3 of the rolling line side is taken as the temperature t1 of the slab head, and the average of the remaining points is taken as the temperature t0 of the middle part of the slab, where t0 is used as the reference value for determining the temperature along the length direction of the slab, and △t1=t1-t0 is taken as the actual temperature difference control result of the head; △t2=t2-t0 is taken as the actual temperature difference control result of the tail;

[0019] S4: Based on the measured temperature value in the length direction of the slab and the process control requirements, L2 sends the temperature setting values ​​of the upper left, middle and right sections of the soaking section to L1;

[0020] S5: L1 periodically collects the temperature data of the furnace gas in the upper part of the current soaking section and uploads it to L2;

[0021] S6: L2 combines the current slab calculation temperature, furnace gas temperature, and the remaining furnace time predicted under the current rolling rhythm to calculate the predicted values ​​of the head, middle, and tail temperatures of the slab in the next model calculation cycle, which are the head temperature prediction value T1, the middle temperature prediction value T2, and the tail temperature prediction value T3. Take △T1=T1-T0 as the head temperature difference prediction value, and take △T2=T2-T0 as the tail temperature difference prediction value;

[0022] S7: L2 calculates the deviation △t between the predicted value and the process requirement value; and determines whether the furnace gas temperatures of the left, middle and right sections of the upper part of the soaking section meet the temperature control requirements of the head, middle and tail of the slab;

[0023] If the furnace gas temperature meets the requirements of the head, middle and tail temperature control of the slab, the current furnace gas temperature is judged to be normal, and the normal furnace temperature cycle calculation set value is sent to L1 without correcting the head, middle and tail temperatures;

[0024] If the furnace gas temperature does not meet the requirements of slab head, middle and tail temperature control, the current furnace gas temperature is judged to be abnormal, and a correction value is sent to L1 based on the set value calculated based on the furnace temperature cycle;

[0025] S8: L2 sends the temperature setting values ​​of the upper left, middle and right parts of the equalizing section to L1;

[0026] S9: L1 sets the gas flow rate of the upper burner in the soaking section according to the furnace temperature setting issued by L2;

[0027] S10: When a new L2 calculation cycle begins, L2 repeats steps S4 to S9.

[0028] The control method for automatic adjustment of the full-length temperature of the slab based on the full-field-of-view thermometer described in the present invention utilizes the full-field-of-view thermometer in the furnace to measure the full-length temperature distribution of the slab before it enters the soaking section, and uploads the relevant data to L2, which automatically retrieves the full-length temperature control specification of the slab, compares it with the current full-length temperature measured by the full-field-of-view thermometer, and sets the temperature of the three control zones on the upper left, middle and right of the soaking section in combination with the current steel drawing rhythm, thereby achieving the purpose of automatically controlling the head, middle and tail temperatures of the slab, and further realizing the automatic control function of the temperature of the slab in the full-length direction of the furnace.

[0029] Specifically, the full-field temperature measuring instrument at least includes a high-temperature monitoring probe, a pneumatic propeller and a furnace wall connector, wherein the high-temperature monitoring probe is fixed on the pneumatic propeller, the pneumatic propeller is fixed on the furnace wall connector, and the furnace wall connector is fixedly mounted on the side wall of the furnace body;

[0030] The high temperature monitoring probe is connected to the circuit of the electrical control cabinet, and the pneumatic propeller is connected to the gas circuit and / or circuit of the air source control cabinet;

[0031] The output signal of the high temperature monitoring probe is transmitted to the computer image information analysis system to obtain the real-time video image and infrared radiation spectrum of the heating slab working condition in the heating furnace, and automatically realize the image recognition, temperature measurement and temperature field distribution analysis of the heated workpiece.

[0032] Furthermore, a set of full-field-of-view temperature measuring instruments are respectively arranged at the inlet and the outlet of the heating furnace to collect and detect the visible surface radiation spectrum of the heated slab in the heating furnace.

[0033] Specifically, when analyzing the temperature detection values ​​of the entire length of the slab, temperature detection values ​​less than 850 degrees or greater than 1250 degrees are determined to be abnormal points and are removed.

[0034] Furthermore, the temperature control of the slab in the entire length direction is carried out by controlling the temperatures of the head, middle and tail sections of the slab. Taking the average temperature t0 of the middle section of the slab as the reference, the temperature of the head section of the slab is taken as t1, and the temperature of the tail section of the slab is taken as t2.

[0035] Specifically, the heating furnace is provided with 8 rows of 40 burners on the upper part of the equalizing section, which are divided into three sections: left, middle and right, and are independently controlled; the left section controls 10 burners, corresponding to the tail temperature control of the slab, the middle section controls 20 burners, corresponding to the middle temperature control of the slab, and the right section controls 10 burners, corresponding to the head temperature control of the slab.

[0036] Furthermore, the adjustment method of the deviation Δt between the predicted value and the process requirement value is determined according to the following rules:

[0037] 1) If the absolute value of the deviation △t between the predicted value and the process requirement target value |△t| is less than 10℃, the corresponding furnace temperature correction value is 0, and L2 sends the normal cycle to calculate the furnace temperature setting value;

[0038] 2) If the absolute value of the deviation △t between the predicted value and the process requirement target value |△t|>10℃, the furnace temperature setting value calculated in the next cycle = the furnace temperature setting value calculated in the normal cycle -△t.

[0039] Compared with the prior art, the advantages of the present invention are:

[0040] 1. The present invention adopts online real-time acquisition of the surface temperature distribution of the slab (also called steel billet), and can realize the temperature control function of the slab in the full length direction by detecting the temperature of the slab and controlling the temperature of the slab in the full length direction, thereby improving the uniformity of the temperature control of the slab in the full length direction;

[0041] 2. After adopting the technical solution of the present invention, automatic adjustment in the length direction of the slab can be achieved, and the accuracy has been greatly improved compared with the previous situation of completely relying on model calculation and manual control of rough rolling RT2 temperature feedback;

[0042] 3. By measuring the full-length temperature of the slab before entering the heating furnace, the temperature control of the slab in the heating furnace can be achieved in a targeted manner. The previous "after-the-fact control" mode is improved to a "real-time" control mode, which can be adjusted at any time. There is no "lag" in the control effect, which is convenient for predictive adjustment and helps to improve the full-length uniformity of the slab in the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the hardware system components of the present invention;

[0044] Figure 2 This is a schematic diagram of combustion control in the upper part of the soaking section;

[0045] Figure 3 It is a flow chart of the control method of the present invention.

[0046] In the figure, 1 is a high temperature monitoring probe, 2 is a pneumatic thruster, 3 is a furnace wall connector, 4 is an electrical control cabinet, 5 is an air source control cabinet, and 6 is a computer image information analysis system. DETAILED DESCRIPTION

[0047] The present invention will be further described below in conjunction with the accompanying drawings.

[0048] The temperature distribution in the length direction of the slab is an important parameter that reflects the heating quality. Different types of steel have different control requirements. Reasonable head, middle, and tail temperature control parameters must be set during the heating process according to the characteristics of each type of steel.

[0049] 1. Description of related equipment:

[0050] The control method adopted by the present invention for automatically adjusting the temperature of the entire length of the slab based on a full-field-of-view thermometer can measure the temperature distribution of the entire length of the slab before it enters the equalizing section based on actual measurements. Compared with the previous method that purely relies on the heating model, the accuracy is greatly improved.

[0051] The implementation of the present invention requires the use of an existing primary control computer (field control computer, referred to as L1), a secondary control computer (heating furnace temperature control computer, referred to as L2) and a full-field temperature measuring instrument.

[0052] The first step is to install a full-field thermometer. The main related equipment is introduced as follows:

[0053] The hardware system of the full-field temperature measurement system is mainly composed of six modules, such as Figure 1 As shown in, they are:

[0054] High temperature monitoring probe 1, pneumatic propeller 2, furnace wall connector 3, electrical control cabinet 4, gas source control cabinet 5 and computer image information analysis system 6.

[0055] Among them, the high temperature monitoring probe 1 (referred to as the probe) is fixed on the pneumatic propeller 2, the pneumatic propeller (also called the transmission mechanism) is fixed on the furnace wall connector 3, and the furnace wall connector is directly fixed on the side wall of the furnace body (not shown in the figure) through angle steel.

[0056] In normal state, the transmission mechanism sends the probe into the furnace to obtain real-time video images of the working conditions in the heating furnace and infrared radiation spectra of the heated slab to realize slab temperature monitoring.

[0057] When the heating furnace encounters abnormalities such as "gas outage" or "power outage", the transmission mechanism will withdraw the probe from the furnace to prevent the probe from being burned by the high temperature in the furnace.

[0058] The full-field temperature measurement system adopts air-cooling protection. The high-temperature monitoring probe is directly fixed on the side wall of the furnace through the furnace wall connector to obtain real-time video images and infrared radiation spectra of the heating workpiece in the heating furnace, and automatically realize image recognition, temperature measurement and temperature field distribution analysis of the heated workpiece.

[0059] The computer image information analysis system 6 is installed in L2 of the heating furnace.

[0060] The layout of the full-field temperature measurement system is as follows:

[0061] A set of probes are installed at the outlet of the heating section and the inlet of the soaking section of the No. 1 heating furnace of a certain unit to detect the slab (also called billet) in the furnace.

[0062] The digital image signal collected by the full-field thermometer (i.e. the aforementioned high-temperature monitoring probe) is sent to L1 through the data interface for data analysis and processing, and the visible surface radiation spectrum of the heated workpiece is analyzed to calculate the full-length surface temperature of the slab and accurately obtain the real-time distribution of the slab surface temperature. The data is then uploaded to L2 of the heating furnace.

[0063] In the industry, the field computer used for field control in the heating furnace control system is usually referred to as L1, and the main control room computer used for process production process control and recording is usually referred to as L2. These are common names used in field work in this field. Technical personnel in this field can all understand their meanings and functions without any doubt, so they will not be described in detail here.

[0064] 2. Functional implementation description:

[0065] The temperature control of the slab in the entire length direction described in the technical solution of the present invention is carried out by controlling the temperatures of the head, middle and tail sections of the slab.

[0066] Taking the average temperature t0 of the middle part of the slab as the reference, the temperature of the head of the slab is taken as t1, and the temperature of the tail of the slab is taken as t2. The specific steps are as follows:

[0067] S1: The slab enters the 1# heating furnace, and L2 automatically indexes the temperature control principle in the length direction of the slab according to the current steel-out mark, slab contract number, whether the hot coil box is used, and other index items, and obtains the temperature difference control target value M1 at the head of the slab and the temperature difference control target value M2 at the tail;

[0068] S2: After the slab enters the soaking section, the full-field temperature measuring instrument uploads the temperature distribution data of the entire length of the slab to L2 of the heating furnace;

[0069] S3: L2 analyzes the uploaded measured slab full-length temperature data. The specific steps are as follows:

[0070] 1) Analyze the temperature detection values ​​of the entire length of the slab and remove abnormal points. Detection values ​​less than 850 or greater than 1250 are considered abnormal points and removed;

[0071] 2) According to the number of temperature measurement points along the entire length of the slab, the average of the points close to 1 / 3 of the slab side is taken as the temperature t2 of the slab tail, the average of the points close to 1 / 3 of the rolling line side is taken as the temperature t1 of the slab head, and the average of the remaining points is taken as the temperature t0 of the middle part of the slab. T0 is also the reference value for determining the temperature along the length direction of the slab. △t1 = t1-t0 is taken as the actual temperature difference control result of the head; △t2 = t2-t0 is taken as the actual temperature difference control result of the tail.

[0072] S4: Based on the measured temperature value in the length direction of the slab and the process control requirements, L2 sends L1 the temperature setting values ​​for the upper left, middle and right sections of the soaking section;

[0073] S5: L1 periodically collects the furnace gas temperature data of the upper part of the current soaking section and uploads it to L2;

[0074] S6: L2 combines the current slab calculation temperature, furnace gas temperature, and the remaining furnace time predicted under the current rolling rhythm to calculate the predicted values ​​of the head, middle, and tail temperatures of the slab in the next model calculation cycle, which are the head temperature prediction value T1, the middle temperature prediction value T2, and the tail temperature prediction value T3. △T1=T1-T0 is the head temperature difference prediction value, △T2=T2-T0 is the tail temperature difference prediction value;

[0075] S7: L2 calculates the deviation △t between the predicted value and the process requirement value. And judges whether the furnace gas temperature of the upper left, middle and right sections of the soaking section meets the requirements of the head, middle and tail temperature control of the slab. If it meets the requirements, the current furnace gas temperature is judged to be normal, and the normal furnace temperature cycle calculation set value is sent to L1, and the head, middle and tail temperature correction is not performed. Otherwise, the correction value is sent to L1 based on the furnace temperature cycle calculation set value;

[0076] S8: L2 sends the temperature setting values ​​of the upper left, middle and right parts of the equalizing section to L1;

[0077] S9: L1 sets the gas flow rate of the upper burner in the soaking section according to the furnace temperature setting issued by L2;

[0078] S10: When a new L2 calculation cycle begins, L2 repeats steps S4 to S9.

[0079] Specifically, in the technical solution of the present invention, the No. 1 heating furnace described in step S1 has 8 rows of 40 burners on the upper part of the soaking section, which are divided into three sections: left, middle and right, and are independently controlled. The left section controls 10 burners, corresponding to the temperature control of the tail of the slab, the middle section controls 20 burners, corresponding to the temperature control of the middle of the slab, and the right section controls 10 burners, corresponding to the temperature control of the head of the slab. For details, please refer to Figure 2 Schematic diagram of combustion control in the upper part of the soaking section shown in .

[0080] Furthermore, the adjustment method of the deviation Δt between the predicted value and the process requirement value described in step S7 is determined as follows:

[0081]

[0082]

[0083] After installing the full-field temperature measuring instrument in the 15801# heating furnace and adopting the above method, automatic adjustment in the length direction of the slab can be achieved. Compared with the previous situation of completely relying on model calculation and manual control of rough rolling RT2 temperature feedback, the accuracy has been greatly improved. The specific data is as follows:

[0084] Before commissioning After commissioning January to June of a certain year July to December of a certain year Carbon steel RT2±20℃ accuracy hit rate 82.13％ 90.95％ Silicon steel RT2±20℃ accuracy hit rate 76.31％ 82.77％

[0085] After adopting the technical solution of the present invention, the index of "carbon steel RT2±20℃ accuracy hit rate" has been significantly improved, indicating that the temperature control accuracy of the heating furnace has been greatly improved.

[0086] The technical solution of the present invention utilizes a full-field-of-view thermometer in the furnace to measure the full-length temperature distribution of the slab before it enters the soaking section, and uploads the relevant data to L2. L2 automatically retrieves the full-length temperature control specification of the slab, compares it with the current full-length temperature measured by the full-field-of-view thermometer, and combines the current steel extraction rhythm to set the temperatures of the three control zones on the left, middle and right of the upper soaking section (corresponding to the head, middle and tail of the slab), thereby achieving the purpose of automatically controlling the temperature of the head, middle and tail of the slab, and further realizing the automatic control function of the temperature of the slab in the full-length direction of the furnace.

[0087] The invention can be widely used in the field of temperature process control of heating furnaces.

Claims

1. A control method for automatic adjustment of the full-length temperature of a slab based on a full-field-of-view thermometer, comprising controlling and adjusting the temperature of a heating furnace by detecting the temperature of the slab, and characterized by: 1) At least one set of full-field temperature measuring instrument in the furnace is provided to obtain real-time video images of the working conditions in the heating furnace and infrared radiation spectrum of the heated slab to realize slab temperature monitoring; 2) Analyze and process the digital image signals collected by the full-field thermometer in the furnace, analyze the visible surface radiation spectrum of the heated slab, calculate the full-length surface temperature of the slab, and accurately obtain the real-time distribution of the slab surface temperature; and upload the data to L2 of the heating furnace; 3) Follow the steps below to control the temperature of the slab along its entire length: S1: The slab enters the heating furnace, and L2 automatically indexes the temperature control principle in the length direction of the slab according to the current steel-out mark, the slab contract number, and whether the hot coil box index item is used, and obtains the temperature difference control target value M1 at the head of the slab and the temperature difference control target value M2 at the tail; S2: After the slab enters the soaking section, the full-field temperature measuring instrument in the furnace uploads the temperature distribution data of the entire length of the slab to L2 of the heating furnace; S3: L2 analyzes and processes the uploaded measured slab full-length temperature data. The specific steps of the analysis and processing include at least: a) Analyze the temperature detection values ​​of the entire length of the slab and remove abnormal points; b) According to the number of temperature measurement points along the entire length of the slab, the average of the points close to 1 / 3 of the slab side is taken as the average temperature t2 of the slab tail, the average of the points close to 1 / 3 of the rolling line side is taken as the average temperature t1 of the slab head, and the average of the remaining points is taken as the average temperature t0 of the slab middle, where t0 is used as the reference value for determining the temperature in the length direction of the slab, and △t1=t1-t0 is taken as the actual temperature difference control result of the head; △t2=t2-t0 is taken as the actual temperature difference control result of the tail; S4: Based on the measured temperature value in the length direction of the slab and the process control requirements, L2 sends the temperature setting values ​​of the upper left, middle and right sections of the soaking section to L1; S5: L1 periodically collects the temperature data of the furnace gas in the upper part of the current soaking section and uploads it to L2; S6: L2 combines the current slab calculation temperature, furnace gas temperature, and the remaining furnace time predicted under the current rolling rhythm to calculate the predicted values ​​of the head, middle, and tail temperatures of the slab in the next model calculation cycle, which are the head temperature prediction value T1, the middle temperature prediction value T2, and the tail temperature prediction value T3 respectively; △T1=T1-T0 is taken as the head temperature difference prediction value, and △T2=T2-T0 is taken as the tail temperature difference prediction value; S7: L2 calculates the deviation △t between the predicted value and the process requirement value; and determines whether the furnace gas temperatures of the left, middle and right sections of the upper part of the soaking section meet the temperature control requirements of the head, middle and tail of the slab; If the furnace gas temperature meets the requirements of the head, middle and tail temperature control of the slab, the current furnace gas temperature is judged to be normal, and the normal furnace temperature cycle calculation set value is sent to L1 without correcting the head, middle and tail temperatures; If the furnace gas temperature does not meet the requirements of slab head, middle and tail temperature control, the current furnace gas temperature is judged to be abnormal, and a correction value is sent to L1 based on the set value calculated based on the furnace temperature cycle; S8: L2 sends the temperature setting values ​​of the upper left, middle and right parts of the equalizing section to L1; S9: L1 sets the gas flow rate of the upper burner in the soaking section according to the furnace temperature setting issued by L2; S10: When a new L2 calculation cycle begins, L2 repeats steps S4 to S9.

2. The control method for automatic temperature adjustment of the entire length of the slab based on the full-field temperature measuring instrument according to claim 1 is characterized in that The control method for automatic adjustment of the full-length temperature of the slab based on the full-field-of-view thermometer uses the full-field-of-view thermometer in the furnace to measure the full-length temperature distribution of the slab before it enters the soaking section, and uploads the relevant data to L2. L2 automatically retrieves the full-length temperature control specification of the slab, compares it with the current full-length temperature measured by the full-field-of-view thermometer, and sets the temperature of the three control zones on the upper left, middle and right of the soaking section in combination with the current steel extraction rhythm, thereby achieving the purpose of automatically controlling the head, middle and tail temperatures of the slab, and further realizing the automatic control function of the temperature of the slab in the full-length direction of the furnace.

3. The control method for automatic temperature adjustment of the entire length of the slab based on the full-field temperature measuring instrument according to claim 1 is characterized in that The full-field temperature measuring instrument at least includes a high-temperature monitoring probe, a pneumatic propeller and a furnace wall connector, wherein the high-temperature monitoring probe is fixed on the pneumatic propeller, the pneumatic propeller is fixed on the furnace wall connector, and the furnace wall connector is fixedly mounted on the side wall of the furnace body; The high temperature monitoring probe is connected to the circuit of the electrical control cabinet, and the pneumatic propeller is connected to the gas circuit and / or circuit of the air source control cabinet; The output signal of the high temperature monitoring probe is transmitted to the computer image information analysis system to obtain the real-time video image and infrared radiation spectrum of the heating slab working condition in the heating furnace, and automatically realize the image recognition, temperature measurement and temperature field distribution analysis of the heated workpiece.

4. The control method for automatic temperature adjustment of the entire length of the slab based on the full-field temperature measuring instrument according to claim 1 is characterized in that A set of full-field temperature measuring instruments is installed at the inlet and outlet of the heating furnace to collect and detect the visible surface radiation spectrum of the heated slab in the heating furnace.

5. The control method for automatically adjusting the temperature of the entire length of the slab based on the full-field-of-view thermometer according to claim 1 is characterized in that when analyzing the temperature detection values ​​of the entire length of the slab, the temperature detection values ​​less than 850 degrees or greater than 1250 degrees are determined to be abnormal points and removed.

6. The control method for automatic temperature adjustment of the entire length of the slab based on the full-field temperature measuring instrument according to claim 1 is characterized in that The temperature of the slab in the entire length direction is controlled by controlling the temperatures of the head, middle and tail sections of the slab.

7. The control method for automatic temperature adjustment of the entire length of the slab based on the full-field temperature measuring instrument according to claim 1 is characterized in that The heating furnace is provided with 8 rows of 40 burners at the upper part of the soaking section, which are divided into three sections: left, middle and right, and are independently controlled; The left section controls 10 burners, corresponding to the temperature control of the tail of the slab, the middle section controls 20 burners, corresponding to the temperature control of the middle of the slab, and the right section controls 10 burners, corresponding to the temperature control of the head of the slab.

8. The control method for automatic temperature adjustment of the entire length of the slab based on the full-field temperature measuring instrument according to claim 1 is characterized in that The adjustment method of the deviation △t between the predicted value and the process requirement value is determined according to the following rules: 1) If the absolute value of the deviation △t between the predicted value and the process requirement target value |△t| is less than 10℃, the corresponding furnace temperature correction value is 0, and L2 sends the normal cycle to calculate the furnace temperature setting value; 2) If the absolute value of the deviation △t between the predicted value and the process requirement target value |△t|>10℃, the furnace temperature setting value calculated in the next cycle = the furnace temperature setting value calculated in the normal cycle -△t.

Images