Method for Setting Temperature of Radiant Tube Heating Section in Vertical Annealing Furnace

Abstract

The present application relates to the technical field of steel rolling, and discloses a method for setting the temperature of the heating section of the radiant tube of a vertical annealing furnace. The method comprises: constructing a regional temperature setting model based on the set temperature of the strip at the outlet of the heating section of the annealing furnace and the heat load output of the heating section of the annealing furnace; constructing a regional temperature correction model based on the deviation value between the actual temperature of the strip at the outlet of the heating section of the annealing furnace and the set temperature and the regional temperature adjustment factor, wherein the regional temperature adjustment factor is used to guide the adjustment of the temperature of each area of ​​the heating section of the annealing furnace; determining the temperature of the heating section of the radiant tube of the vertical annealing furnace based on the regional temperature setting model and the regional temperature correction model. The technical solution proposed in the present application effectively solves the problem of abnormal temperature of specification transition between the same steel grades by determining the temperature of the heating section of the radiant tube of the vertical annealing furnace, and achieves the control target of controlling the temperature error of the strip within ±5°C in the vertical radiant tube annealing furnace.

Description

Technical Field

[0001] The present application relates to the technical field of steel rolling, and discloses a method for setting the temperature of a heating section of a radiant tube of a vertical annealing furnace. Background Art

[0002] The plate temperature control of the heating section of the vertical radiant tube annealing furnace for cold-rolled thin plates is different from that of the direct-fired heating furnace. Due to the long heating time and low heating rate, there is a hysteresis in the temperature control (thermal inertia 60-120s, hysteresis 80-561s). Therefore, it is difficult to control the strip temperature in the heating section within ±5°C without the intervention of the operator. On the one hand, the annealing coil orders are characterized by small batches and multiple specifications. On the other hand, the strip temperature is strongly correlated with the specifications, speed, and steel type. How to solve the hysteresis of the temperature control in the heating section is particularly important for the consistency of performance. The conventional method is to add a PID feedforward function, but the pain point of on-site use is that the PID parameter setting, pre-control time, and the relationship between the control amount and the specification require a long time to debug; in addition, it cannot effectively solve the problem of abnormal temperature transition between the same steel grade. For different steel grades, such as the transition between general material and DP, general material and low-alloy high-strength steel, it can only play an improvement role, and it cannot achieve the control target of the strip temperature within ±5°C. Based on this, the present application proposes a method for setting the temperature of the heating section of the radiant tube of a vertical annealing furnace, which can effectively solve the problem of abnormal temperature transition between specifications of the same steel grade, and achieve the control target of controlling the temperature error of the strip in the vertical radiant tube annealing furnace within ±5°C. Summary of the invention

[0003] The present application relates to the field of steel rolling technology, and discloses a method for setting the temperature of the heating section of a radiant tube of a vertical annealing furnace, which can effectively solve the problem of abnormal temperature in the specification transition between the same steel grades, and achieve the control target of controlling the temperature error of the strip steel within ±5°C in the vertical radiant tube annealing furnace.

[0004] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0005] According to a first aspect of an embodiment of the present application, a method for setting the temperature of a heating section of a radiant tube of a vertical annealing furnace is provided, the method comprising: constructing a regional temperature setting model based on the set temperature of the outlet strip of the annealing furnace heating section and the heat load output of the annealing furnace heating section; constructing a regional temperature correction model based on the deviation value between the actual temperature of the outlet strip of the annealing furnace heating section and the set temperature and a regional temperature adjustment factor, the regional temperature adjustment factor being used to guide the adjustment of the temperature of each region of the annealing furnace heating section; determining the temperature of the heating section of the radiant tube of the vertical annealing furnace based on the regional temperature setting model and the regional temperature correction model.

[0006] In one embodiment of the present application, based on the aforementioned scheme, before constructing the regional temperature setting model, the method also includes: dividing the annealing furnace heating section into a first heating section and a second heating section; dividing the annealing furnace heating section into N regions, wherein the first heating section includes M regions, and the second heating section includes NM regions, wherein M and N are both natural numbers, and M is less than N.

[0007] In one embodiment of the present application, based on the above solution, the regional temperature setting model includes:

[0008]

[0009] Among them, T ZM_1 is the temperature setting value of the first zone of the first heating section, in °C; T sp P is the set temperature of the strip at the outlet of the annealing furnace heating section, in °C; HD is the set heat load output of heating sections of different specifications, in %; T ZM_M It is the temperature setting value of the last zone in the first heating section, in °C.

[0010] In one embodiment of the present application, based on the above solution, the regional temperature setting model further includes:

[0011]

[0012] Among them, T ZM_M+1 T is the temperature setting value of the first zone of the second heating section, in °C; ZM_N The temperature setting value of the last zone in the second heating section, in °C; T ZM_j is the temperature setting value of the jth zone in the heating section, in °C.

[0013] In one embodiment of the present application, based on the above solution, the regional temperature correction model includes:

[0014] T ZLL_j =T sp +ΔT ZLL_j ,

[0015] T ZHL_j =T sp +ΔT ZHL_j

[0016] Among them, T ZLL_j is the lower limit of the temperature setting value of the jth zone in the heating section, in °C; T ZHL_j It is the upper limit of the temperature setting value of the jth zone in the heating section, in °C.

[0017] In one embodiment of the present application, based on the above solution, the regional temperature correction model further includes:

[0018]

[0019] Among them, T Zsp_j is the corrected temperature setting value of the jth zone in the heating section in automatic mode, in °C; T Z_max is the maximum zone temperature setting value, in °C; f TV_j is the regional temperature adjustment factor under different furnace conditions, which is related to the strip specifications, speed, and annealing temperature and is dimensionless; ΔT S ΔT is the deviation between the actual value and the set value of the strip temperature at the outlet of the heating section, in °C; LL ΔT is the lower limit of the deviation between the actual value and the set value of the strip temperature at the outlet of the heating section, in °C; HL It is the upper limit of the deviation between the actual value of the strip temperature at the outlet of the heating section and the set value, in °C.

[0020] In one embodiment of the present application, based on the above solution, the regional temperature correction model further includes:

[0021]

[0022] Among them, f TV_1 is the temperature adjustment factor of the first zone in the first heating section, dimensionless; f 1_50 P is the temperature adjustment factor of the first zone of the first heating section when the heat load output is 50%, dimensionless; strip It is the actual heat load output of heating sections of different specifications, which is related to the strip width, thickness, running speed, and the set value of the strip temperature at the outlet of the heating section. The unit is %; f 1_75 f is the temperature adjustment factor of the first zone of the first heating section when the heat load output is 75%, dimensionless; 1_100 f is the temperature adjustment factor of the first zone of the first heating section when the heat load output is 100%, dimensionless; TV_M is the temperature adjustment factor of the last zone in the first heating section, dimensionless; f M_50 f is the temperature adjustment factor of the last zone of the first heating section when the heat load output is 50%, dimensionless; M_75 f is the temperature adjustment factor of the last zone of the first heating section when the heat load output is 75%, dimensionless; M_100 It is the temperature adjustment factor of the last zone in the first heating section when the heat load output is 100%, dimensionless.

[0023] In one embodiment of the present application, based on the above solution, the regional temperature correction model further includes:

[0024]

[0025] Among them, fTV_M+1 is the temperature adjustment factor of the first zone of the second heating section, dimensionless; f M+1_50 f is the temperature adjustment factor of the first area of ​​the second heating section when the heat load output is 50%, dimensionless; M+1_75 f is the temperature adjustment factor of the first zone of the second heating section when the heat load output is 75%, dimensionless; M+1_100 f is the temperature adjustment factor of the first area of ​​the second heating section when the heat load output is 100%, dimensionless; TV_N is the temperature adjustment factor of the last zone in the second heating section, dimensionless; f N_50 f is the temperature adjustment factor of the last area of ​​the second heating section when the heat load output is 50%, dimensionless; N_75 f is the temperature adjustment factor of the last zone of the second heating section when the heat load output is 75%, dimensionless; N_100 f is the temperature adjustment factor of the last zone of the second heating section when the heat load output is 100%, dimensionless; TV_j is the temperature adjustment factor of the jth zone in the heating section, dimensionless.

[0026] In one embodiment of the present application, based on the aforementioned solution, the method further includes: constructing a plate temperature zone coordinated control model based on the heat load output of the heating section of the annealing furnace and the heat load output of the radiation tube.

[0027] In one embodiment of the present application, based on the above solution, the panel temperature zone temperature coordinated control model includes:

[0028] P zone_i =F3(T Zsp_j ),

[0029] P i =min(F2(T tube_i ),P zone_i )

[0030] Among them, P zone_i is the heat load output of the i-th column of the heating section in the regional temperature mode, in %; F3(T Zsp_j ) is the heat load output of the jth zone in the heating section, which is output by the zone temperature controller and is related to the zone temperature setting value and the measured value, and the unit is %; P i is the heat load output of the i-th column of the heating section after taking into account the tube temperature limit, in %; F2(T tube_i ) is the heat load output of the temperature controller of the i-th tube in the heating section, in %.

[0031] In the technical solution proposed in the present application, a regional temperature setting model is constructed based on the set temperature of the strip at the outlet of the annealing furnace heating section and the heat load output of the annealing furnace heating section; a regional temperature correction model is constructed based on the deviation value between the actual temperature of the strip at the outlet of the annealing furnace heating section and the set temperature and the regional temperature adjustment factor, and the regional temperature adjustment factor is used to guide the adjustment of the temperature of each area of ​​the annealing furnace heating section; based on the regional temperature setting model and the regional temperature correction model, the temperature of the radiant tube heating section of the vertical annealing furnace is determined. Based on this, the technical solution proposed in the present application can realize the function of real-time adjustment of the heat supply in the continuous heating process of the strip by establishing a regional temperature setting model under different furnace conditions, and correct the model temperature setting value in combination with the regional temperature correction model, so that the temperature fluctuation range of the strip during the transition of steel grades can be controlled within ±5°C.

[0032] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0034] Figure 1 A flow chart showing a method for setting the temperature of a heating section of a radiant tube of a vertical annealing furnace in an embodiment of the present application is shown;

[0035] Figure 2 A schematic diagram of a heating section of a continuous annealing furnace in a specific embodiment of the present application is shown;

[0036] Figure 3 A diagram showing the relationship between the temperature of the continuous annealing furnace zone and the heat load output of the heating section and the annealing temperature in a specific embodiment of the present application is shown;

[0037] Figure 4 A graph showing a change trend of the temperature setting value of the heating section area of ​​the continuous annealing furnace in a specific embodiment of the present application is shown;

[0038] Figure 5 A monitoring curve diagram of temperature process control parameters of the heating section when joining high-strength steel with conventional plates in a specific embodiment of the present application is shown. DETAILED DESCRIPTION

[0039] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0040] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0041] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0042] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0043] It should be noted that the "multiple" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the objects used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those shown or described.

[0045] The implementation details of the technical solution of the embodiment of the present application are described in detail below:

[0046] Figure 1A flow chart of a method for setting the temperature of a heating section of a radiant tube of a vertical annealing furnace in an embodiment of the present application is shown.

[0047] like Figure 1 As shown, the method for setting the temperature of the heating section of the radiant tube of the vertical annealing furnace at least includes steps 110 to 150.

[0048] The following will Figure 1 Steps 110 to 150 are described in detail:

[0049] In step 110, a regional temperature setting model is constructed based on the set temperature of the steel strip at the outlet of the heating section of the annealing furnace and the heat load output of the heating section of the annealing furnace.

[0050] Continue to refer Figure 1 In step 130, a regional temperature correction model is constructed based on the deviation between the actual temperature of the strip at the outlet of the annealing furnace heating section and the set temperature and the regional temperature adjustment factor, and the regional temperature adjustment factor is used to guide the adjustment of the temperature of each area of ​​the annealing furnace heating section.

[0051] Continue to refer Figure 1 In step 150, the temperature of the radiant tube heating section of the vertical annealing furnace is determined based on the regional temperature setting model and the regional temperature correction model.

[0052] In one embodiment of the present application, before constructing the regional temperature setting model, the method also includes: dividing the annealing furnace heating section into a first heating section and a second heating section; dividing the annealing furnace heating section into N areas, wherein the first heating section includes M areas, and the second heating section includes NM areas, wherein M and N are both natural numbers, and M is less than N.

[0053] In the present application, the heating section of the annealing furnace is divided into N areas. The heating section can be divided into multiple areas according to a set length, or the heating section can be divided into multiple areas according to a set number of turning and returning rollers. The set length and set number can be set according to actual needs.

[0054] In the present application, at least one thermocouple or other temperature measuring instrument is arranged in each area obtained after the heating section is divided, so as to obtain the strip temperature of each area.

[0055] In one embodiment of the present application, the regional temperature setting model includes:

[0056]

[0057]

[0058] Among them, T ZM_1is the temperature setting value of the first zone of the first heating section, in °C; T sp P is the set temperature of the strip at the outlet of the annealing furnace heating section, in °C; HD is the set heat load output of heating sections of different specifications, in %; T ZM_M It is the temperature setting value of the last zone of the first heating section, in °C.

[0059] In the present application, the set heat load output of the heating sections of different specifications is related to parameters such as the strip width, thickness, running speed, and the set value of the strip temperature at the outlet of the heating section.

[0060] In the present application, the temperature setting values ​​of the first area and the last area of ​​the first heating section are determined according to the set heat load output of heating sections of different specifications and the set temperature of the strip at the outlet of the heating section of the annealing furnace, the strip is heated by the operating side burner and the driving side burner in the annealing furnace, and the temperature of the strip in the first area and the last area of ​​the first heating section is adjusted to the corresponding temperature setting value.

[0061] In one embodiment of the present application, the regional temperature setting model further includes:

[0062]

[0063] Among them, T ZM_M+1 T is the temperature setting value of the first zone of the second heating section, in °C; ZM_N The temperature setting value of the last zone in the second heating section, in °C; T ZM_j is the temperature setting value of the jth zone in the heating section, in °C.

[0064] In the present application, in the present application, according to the set heat load output of heating sections of different specifications and the set temperature of the strip at the outlet of the heating section of the annealing furnace, the temperature setting values ​​of the first area, the last area and other areas of the second heating section are determined, the strip is heated by the operating side burner and the driving side burner in the annealing furnace, and the strip temperature in the first area, the last area and other areas of the second heating section is adjusted to the corresponding temperature setting value.

[0065] In one embodiment of the present application, the regional temperature correction model includes:

[0066] T ZLL_j =T sp +ΔT ZLL_j ,

[0067] T ZHL_j =T sp +ΔT ZHL_j

[0068] Among them, TZLL_j is the lower limit of the temperature setting value of the jth zone in the heating section, in °C; T ZHL_j It is the upper limit of the temperature setting value of the jth zone in the heating section, in °C.

[0069] In the present application, the lower limit of the temperature setting value of the j-th zone of the heating section ranges from -400 to 50°C, and the upper limit of the temperature setting value of the j-th zone of the heating section ranges from 0 to 200°C.

[0070] In one embodiment of the present application, the regional temperature correction model further includes:

[0071]

[0072] Among them, T Zsp_j is the corrected temperature setting value of the jth zone in the heating section in automatic mode, in °C; T Z_max is the maximum zone temperature setting value, in °C; f TV_j is the regional temperature adjustment factor under different furnace conditions, which is related to the strip specifications, speed, and annealing temperature and is dimensionless; ΔT S ΔT is the deviation between the actual value and the set value of the strip temperature at the outlet of the heating section, in °C; LL ΔT is the lower limit of the deviation between the actual value and the set value of the strip temperature at the outlet of the heating section, in °C; HL It is the upper limit of the deviation between the actual value of the strip temperature at the outlet of the heating section and the set value, in °C.

[0073] In the present application, the temperature setting value of each area of ​​the annealing furnace heating section is adjusted according to the set temperature of the strip at the outlet of the annealing furnace heating section and the actual temperature of the strip at the outlet of the annealing furnace heating section to prevent the temperature fluctuation range of the strip from being too large.

[0074] In the present application, the lower limit of the deviation control between the actual value of the strip temperature at the outlet of the heating section and the set value is in the range of -20 to -2°C, and the upper limit of the deviation control between the actual value of the strip temperature at the outlet of the heating section and the set value is in the range of 2 to 20°C.

[0075] In one embodiment of the present application, the regional temperature correction model further includes:

[0076]

[0077]

[0078] Among them, f TV_1 is the temperature adjustment factor of the first zone in the first heating section, dimensionless; f 1_50 P is the temperature adjustment factor of the first zone of the first heating section when the heat load output is 50%, dimensionless; stripIt is the actual heat load output of heating sections of different specifications, which is related to the strip width, thickness, running speed, and the set value of the strip temperature at the outlet of the heating section. The unit is %; f 1_75 f is the temperature adjustment factor of the first zone of the first heating section when the heat load output is 75%, dimensionless; 1_100 f is the temperature adjustment factor of the first zone of the first heating section when the heat load output is 100%, dimensionless; TV_M is the temperature adjustment factor of the last zone in the first heating section, dimensionless; f M_50 f is the temperature adjustment factor of the last zone of the first heating section when the heat load output is 50%, dimensionless; M_75 f is the temperature adjustment factor of the last zone of the first heating section when the heat load output is 75%, dimensionless; M_100 It is the temperature adjustment factor of the last zone in the first heating section when the heat load output is 100%, dimensionless.

[0079] In the present application, when the heat load output is 50%, the temperature adjustment factor of the first area of ​​the first heating section ranges from 1 to 1.2; when the heat load output is 75%, the temperature adjustment factor of the first area of ​​the first heating section ranges from 1 to 1.4; when the heat load output is 100%, the temperature adjustment factor of the first area of ​​the first heating section ranges from 1 to 1.6.

[0080] In the present application, when the heat load output is 50%, the temperature adjustment factor of the last area of ​​the first heating section ranges from 1 to 1.2; when the heat load output is 75%, the temperature adjustment factor of the last area of ​​the first heating section ranges from 1 to 1.4; when the heat load output is 100%, the temperature adjustment factor of the last area of ​​the first heating section ranges from 1 to 1.6.

[0081] In one embodiment of the present application, the regional temperature correction model further includes:

[0082]

[0083]

[0084] Among them, f TV_M+1 is the temperature adjustment factor of the first zone of the second heating section, dimensionless; f M+1_50 f is the temperature adjustment factor of the first area of ​​the second heating section when the heat load output is 50%, dimensionless; M+1_75 f is the temperature adjustment factor of the first zone of the second heating section when the heat load output is 75%, dimensionless; M+1_100 f is the temperature adjustment factor of the first area of ​​the second heating section when the heat load output is 100%, dimensionless; TV_Nis the temperature adjustment factor of the last zone in the second heating section, dimensionless; f N_50 f is the temperature adjustment factor of the last area of ​​the second heating section when the heat load output is 50%, dimensionless; N_75 f is the temperature adjustment factor of the last zone of the second heating section when the heat load output is 75%, dimensionless; N_100 f is the temperature adjustment factor of the last zone of the second heating section when the heat load output is 100%, dimensionless; TV_j is the temperature adjustment factor of the jth zone in the heating section, dimensionless.

[0085] In the present application, when the heat load output is 50%, the temperature adjustment factor of the first area of ​​the second heating section ranges from 1 to 1.2; when the heat load output is 75%, the temperature adjustment factor of the first area of ​​the second heating section ranges from 1 to 1.4; when the heat load output is 100%, the temperature adjustment factor of the first area of ​​the second heating section ranges from 1 to 1.6.

[0086] In the present application, when the heat load output is 50%, the temperature adjustment factor of the last area of ​​the second heating section ranges from 1 to 1.2; when the heat load output is 75%, the temperature adjustment factor of the last area of ​​the second heating section ranges from 1 to 1.4; when the heat load output is 100%, the temperature adjustment factor of the last area of ​​the second heating section ranges from 1 to 1.6.

[0087] In one embodiment of the present application, the method further includes: constructing a plate temperature zone coordinated control model based on the heat load output of the heating section of the annealing furnace and the heat load output of the radiation tube.

[0088] In one embodiment of the present application, the panel temperature zone temperature coordinated control model includes:

[0089] P zone_i =F3(T Zsp_j ),

[0090] P i =min(F2(T tube_i ),P zone_i )

[0091] Among them, P zone_i is the heat load output of the i-th column of the heating section in the regional temperature mode, in %; F3(T Zsp_j ) is the heat load output of the jth zone in the heating section, which is output by the zone temperature controller and is related to the zone temperature setting value and the measured value, and the unit is %; P i is the heat load output of the i-th column of the heating section after taking into account the tube temperature limit, in %; F2(Ttube_i ) is the heat load output of the temperature controller of the i-th tube in the heating section, in %.

[0092] In the present application, in the regional temperature mode, the heat load output of each column of the heating section of the annealing furnace is consistent with the heat load output of the corresponding zone in which it is located. In order to prevent the radiant tube in the annealing furnace from malfunctioning, the tube temperature of the radiant tube is limited according to the regional temperature of the zone where the radiant tube is located to prevent the temperature of the radiant tube from being too high.

[0093] In order to make it easier for those skilled in the art to understand the present application, the following will refer to Figures 2 to 5 The present application is described with a specific embodiment.

[0094] Figure 2 A schematic diagram of a heating section of a continuous annealing furnace in a specific embodiment of the present application is shown.

[0095] Figure 3 A graph showing the relationship between the temperature of the continuous annealing furnace zone, the heat load output of the heating section, and the annealing temperature in a specific embodiment of the present application is shown.

[0096] Figure 4 A graph showing a change trend of the temperature setting value of the heating section area of ​​a continuous annealing furnace in a specific embodiment of the present application is shown.

[0097] Figure 5 A monitoring curve diagram of temperature process control parameters of the heating section when joining high-strength steel with conventional plates in a specific embodiment of the present application is shown.

[0098] Taking the 2230 annealing unit of Shougang Jingtang Cold Rolling Operation Department as an example, the heating section has a total of 30 rows of radiation tubes and a total of 15 areas (N=15), of which: the first heating section has a total of 9 areas (M=9); the second heating section has a total of 6 areas, such as Figure 2 shown.

[0099] According to the regional temperature setting model, the relationship between the temperature of the first zone at the entrance of the first heating section and the second heating section of Shougang Jingtang 2230 continuous annealing furnace and the annealing temperature and heat load output can be obtained, such as Figure 3 shown.

[0100] According to the regional temperature setting model, the temperature change trend of each area in the heating section under different specifications, speeds and annealing temperatures of Shougang Jingtang 2230 can be obtained, such as Figure 4 As shown in the figure, 1) the temperature gradually increases from the heating inlet to the outlet; 2) as the furnace conditions change, the temperature change range of the first heating section is generally higher than that of the second heating section.

[0101] 2230 Continuous annealing furnace heating section maximum zone temperature setting value T z_max The lower limit of the deviation between the actual value and the set value of the strip temperature at the outlet of the heating section is ΔT. LL , upper limit ΔT HL They are -3℃ and 3℃ respectively. The upper and lower limits of the regional temperature setting values ​​are shown in Table 1. The temperature adjustment factors of different heat load output regions are shown in Table 2. According to the plate temperature zone coordinated control model of the 2230 continuous annealing furnace, the heat load output of each region is shown in Table 3.

[0102] As shown in Table 4, Table 4 shows the fluctuation of the board temperature control at the outlet of the DP1180 heating section under the coordinated pre-control mode of the temperature of the 2230 continuous retreat board temperature zone. It can be seen from the table that the average fluctuation of the board temperature at the head, middle and tail is within ±3°C, and the peak fluctuation is within ±5°C.

[0103] like Figure 5 The figure shows the temperature control of the heating section during the transition of high-strength steel plate welding at a constant speed in the 2230 continuous annealing zone. At 19:48, the furnace zone transitioned from 1.2*1209mm to 1.2*1209mm. At 19:52, the weld passed through the heating section. It can be seen from the figure that the weld rose by 4.8℃ after passing through the heating section. Compared with the 12℃ before the improvement, the fluctuation was reduced by 7.2℃.

[0104] In summary, the method for setting the strip temperature in the radiant tube heating section of a vertical annealing furnace proposed in the present application realizes the function of real-time adjustment of the heating amount in the continuous heating process of the strip by establishing a regional temperature setting model under different furnace conditions, and corrects the model setting value in combination with the plate temperature controller, so that the temperature fluctuation range of the strip during the transition of steel grades can be controlled within ±5°C.

[0105] Heating section area <![CDATA[T ZLL_j ]]> <![CDATA[T ZHL_j ]]> Heating section area <![CDATA[T ZLL_j ]]> <![CDATA[T ZHL_j <!-- 10 -->]]> 1 <![CDATA[T sp -324]]> <![CDATA[T sp +100]]> 9 <![CDATA[T sp -94]]> <![CDATA[T sp +120]]> 2 <![CDATA[T sp -274]]> <![CDATA[T sp +120]]> 10 <![CDATA[T sp -28]]> <![CDATA[T sp +110]]> 3 <![CDATA[T sp -211]]> <![CDATA[T sp +140]]> 11 <![CDATA[T sp +10]]> <![CDATA[T sp +170]]> 4 <![CDATA[T sp -164]]> <![CDATA[T sp +160]]> 12 <![CDATA[T sp +20]]> <![CDATA[T sp +160]]> 5 <![CDATA[T sp -130]]> <![CDATA[T sp +140]]> 13 <![CDATA[T sp +30]]> <![CDATA[T sp +150]]> 6 <![CDATA[T sp -113]]> <![CDATA[T sp +140]]> 14 <![CDATA[T sp +20]]> <![CDATA[T sp +150]]> 7 <![CDATA[T sp -127]]> <![CDATA[T sp +140]]> 15 <![CDATA[T sp +20]]> <![CDATA[T sp +155]]> 8 <![CDATA[T sp -132]]> <![CDATA[T sp +130]]>

[0106] Table 1

[0107]

[0108] Table 2

[0109]

[0110]

[0111] Table 3

[0112]

[0113]

[0114] Table 4

[0115] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0116] The technical solution proposed in this application realizes the function of real-time adjustment of the heating amount in the continuous heating process of the strip by establishing a regional temperature setting model under different furnace conditions, and corrects the model temperature setting value in combination with the regional temperature correction model, so that the temperature fluctuation range of the strip can be controlled within ±5°C during the transition of steel grades.

[0117] The present application also provides a device for setting the temperature of the heating section of a radiant tube of a vertical annealing furnace, the device comprising: a first construction unit, used to construct a regional temperature setting model based on the set temperature of the outlet strip of the annealing furnace heating section and the heat load output of the annealing furnace heating section; a second construction unit, used to construct a regional temperature correction model based on the deviation value between the actual temperature of the outlet strip of the annealing furnace heating section and the set temperature and the regional temperature adjustment factor, the regional temperature adjustment factor being used to guide the adjustment of the temperature of each region of the heating section of the annealing furnace; a determination unit, used to determine the temperature of the heating section of the radiant tube of the vertical annealing furnace based on the regional temperature setting model and the regional temperature correction model.

[0118] The present application also provides a computer program product, which includes computer instructions, which are stored in a computer-readable storage medium and are suitable for being read and executed by a processor, so that a computer device having the processor executes the method for setting the temperature of the heating section of the radiant tube of the vertical annealing furnace as described in the above embodiment.

[0119] The present application also provides a computer-readable medium, which may be included in an electronic device or may exist independently without being assembled into the electronic device. The computer-readable storage medium stores at least one program code, which is loaded and executed by a processor to implement the method for setting the temperature of the heating section of the radiant tube of the vertical annealing furnace described in the above embodiment.

[0120] The present application also provides an electronic device, which includes one or more processors and one or more memories, wherein the one or more memories store at least one program code, and the at least one program code is loaded and executed by the one or more processors to implement the method for setting the temperature of the heating section of the radiant tube of the vertical annealing furnace described in any of the above embodiments.

[0121] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application.

[0122] In addition, the above-mentioned figures are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, and are not intended to be limiting. It is easy to understand that the processes shown in the above-mentioned figures do not indicate or limit the time sequence of these processes. In addition, it is also easy to understand that these processes can be performed synchronously or asynchronously, for example, in multiple modules.

[0123] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be performed without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for setting the temperature of a heating section of a radiant tube of a vertical annealing furnace, characterized in that: The method comprises: Based on the set temperature of the strip at the outlet of the annealing furnace heating section and the heat load output of the annealing furnace heating section, a regional temperature setting model is constructed; Based on the deviation between the actual temperature of the strip at the outlet of the annealing furnace heating section and the set temperature and the regional temperature adjustment factor, a regional temperature correction model is constructed, wherein the regional temperature adjustment factor is used to guide the adjustment of the temperature of each region of the annealing furnace heating section; Determining the temperature of the radiant tube heating section of the vertical annealing furnace based on the regional temperature setting model and the regional temperature correction model; Before constructing the regional temperature setting model, the method further includes: Dividing the annealing furnace heating section into a first heating section and a second heating section; Dividing the heating section of the annealing furnace into N areas, wherein the first heating section includes M areas, and the second heating section includes NM areas, wherein M and N are both natural numbers, and M is less than N; The regional temperature setting model includes: Among them, T ZM_1 is the temperature setting value of the first zone of the first heating section, in °C; T sp P is the set temperature of the strip at the outlet of the annealing furnace heating section, in °C; HD is the set heat load output of heating sections of different specifications, in %; T ZM_M The temperature setting value of the last zone of the first heating section, in °C; The regional temperature setting model also includes: Among them, T ZM_M+1 T is the temperature setting value of the first zone of the second heating section, in °C; ZM_N The temperature setting value of the last zone in the second heating section, in °C; T ZM_j is the temperature setting value of the jth zone in the heating section, in °C; The regional temperature correction model includes: T ZLL_j =T sp +ΔT ZLL_j , T ZHL_j =T sp +ΔT ZHL_j Among them, T ZLL_j is the lower limit of the temperature setting value of the jth zone in the heating section, in °C; T ZHL_j is the upper limit of the temperature setting value of the jth zone in the heating section, in °C; The regional temperature correction model also includes: Among them, T Zsp_j is the corrected temperature setting value of the jth zone in the heating section in automatic mode, in °C; T Z_max is the maximum zone temperature setting value, in °C; f TV_j is the regional temperature adjustment factor under different furnace conditions, which is related to the strip specifications, speed, and annealing temperature and is dimensionless; ΔT S ΔT is the deviation between the actual value and the set value of the strip temperature at the outlet of the heating section, in °C; LL ΔT is the lower limit of the deviation between the actual value and the set value of the strip temperature at the outlet of the heating section, in °C; HL The upper limit of the deviation between the actual value and the set value of the strip temperature at the outlet of the heating section, in °C; The regional temperature correction model also includes: Among them, f TV_1 is the temperature adjustment factor of the first zone in the first heating section, dimensionless; f 1_50 P is the temperature adjustment factor of the first zone of the first heating section when the heat load output is 50%, dimensionless; strip It is the actual heat load output of heating sections of different specifications, which is related to the strip width, thickness, running speed, and the set value of the strip temperature at the outlet of the heating section. The unit is %; f 1_75 f is the temperature adjustment factor of the first zone of the first heating section when the heat load output is 75%, dimensionless; 1_100 f is the temperature adjustment factor of the first zone of the first heating section when the heat load output is 100%, dimensionless; TV_M is the temperature adjustment factor of the last zone in the first heating section, dimensionless; f M_50 f is the temperature adjustment factor of the last zone of the first heating section when the heat load output is 50%, dimensionless; M_75 f is the temperature adjustment factor of the last zone of the first heating section when the heat load output is 75%, dimensionless; M_100 It is the temperature adjustment factor of the last zone of the first heating section when the heat load output is 100%, dimensionless; The regional temperature correction model also includes: Among them, f TV_M+1 is the temperature adjustment factor of the first zone of the second heating section, dimensionless; f M+1_50 f is the temperature adjustment factor of the first area of ​​the second heating section when the heat load output is 50%, dimensionless; M+1_75 f is the temperature adjustment factor of the first zone of the second heating section when the heat load output is 75%, dimensionless; M+1_100 f is the temperature adjustment factor of the first area of ​​the second heating section when the heat load output is 100%, dimensionless; TV_N is the temperature adjustment factor of the last zone in the second heating section, dimensionless; f N_50 f is the temperature adjustment factor of the last area of ​​the second heating section when the heat load output is 50%, dimensionless; N_75 f is the temperature adjustment factor of the last zone of the second heating section when the heat load output is 75%, dimensionless; N_100 f is the temperature adjustment factor of the last zone of the second heating section when the heat load output is 100%, dimensionless; TV_j is the temperature adjustment factor of the jth zone in the heating section, dimensionless.

2. The method according to claim 1, characterized in that The method further comprises: Based on the heat load output of the heating section of the annealing furnace and the heat load output of the radiation tube, a plate temperature zone temperature coordinated control model is constructed.

3. The method according to claim 2, characterized in that The panel temperature zone temperature coordinated control model includes: Among them, P zone_i is the heat load output of the i-th column of the heating section in the regional temperature mode, in %; F3(T Zsp_j ) is the heat load output of the jth zone in the heating section, which is output by the zone temperature controller and is related to the zone temperature setting value and the measured value, and the unit is %; P i is the heat load output of the i-th column of the heating section after taking into account the tube temperature limit, in %; F2(T tube_i ) is the heat load output of the temperature controller of the i-th tube in the heating section, in %.

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