CN116103484A - Setting method for temperature of heating section of radiant tube of vertical annealing furnace - Google Patents

Setting method for temperature of heating section of radiant tube of vertical annealing furnace Download PDF

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Publication number
CN116103484A
CN116103484A CN202310036134.8A CN202310036134A CN116103484A CN 116103484 A CN116103484 A CN 116103484A CN 202310036134 A CN202310036134 A CN 202310036134A CN 116103484 A CN116103484 A CN 116103484A
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temperature
heating section
zone
heat load
annealing furnace
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Inventor
任伟超
刘学良
孙康
李冠雄
李响
张学范
韩验龙
宋成源
张富明
郑海燕
贾一凡
王道金
司国飞
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Shougang Jingtang United Iron and Steel Co Ltd
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Shougang Jingtang United Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D11/00—Process control or regulation for heat treatments

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

The application relates to the technical field of steel rolling and discloses a setting method of a temperature of a radiant tube heating section of a vertical annealing furnace. The method comprises the following steps: constructing a regional temperature setting model based on the set temperature of the strip steel 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 zone temperature correction model based on a deviation value of the actual temperature of the strip steel at the outlet of the heating section of the annealing furnace and the set temperature and a zone temperature adjustment factor, wherein the zone temperature adjustment factor is used for guiding and adjusting the temperature of each zone of the heating section of the annealing furnace; and 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. According to the technical scheme, the temperature of the radiant tube heating section of the vertical annealing furnace is determined, the problem of abnormal specification transition temperature between the same steel grade is effectively solved, and the control target that the steel temperature error in the vertical radiant tube annealing furnace is controlled within +/-5 ℃ is achieved.

Description

Setting method for temperature of heating section of radiant tube of vertical annealing furnace
Technical Field
The application relates to the technical field of steel rolling and discloses a setting method of a temperature of a radiant tube heating section of a vertical annealing furnace.
Background
The temperature control of the heating section plate of the cold-rolled sheet strip vertical radiant tube annealing furnace is different from that of a direct-fired heating furnace, and the heating time is long, the heating rate is low, so that hysteresis (thermal inertia 60-120 s and hysteresis 80-561 s) exists in the temperature control. Therefore, the temperature of the strip steel in the heating section is difficult to be controlled within +/-5 ℃ under the condition that operators do not intervene. On one hand, the annealing coil order has the characteristics of small batch and multiple specifications, and on the other hand, the strip steel temperature has strong correlation with the specifications, the speed and the steel grade, so that how to solve the problem of hysteresis of temperature control of a 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 the field use is that the PID parameter setting, the pre-control time and the relation between the control quantity and the specification need long-time debugging; in addition, the problem of abnormal specification transition temperature between the same steel types cannot be effectively solved, and the transition between different steel types, such as common materials and DP, common materials and low alloy high strength steel, can only play an improved role, and the control target of the strip steel temperature within +/-5 ℃ cannot be realized. Based on the above, the application provides a setting method of the temperature of the radiant tube heating section of the vertical annealing furnace, which can effectively solve the problem of abnormal specification transition temperature between the same steel types and realize the control target that the temperature error of the steel in the vertical radiant tube annealing furnace is controlled within +/-5 ℃.
Disclosure of Invention
The application relates to the technical field of steel rolling and discloses a setting method of a temperature of a radiant tube heating section of a vertical annealing furnace. The problem of abnormal specification transition temperature between the same steel types can be effectively solved, and the control target that the temperature error of the strip steel in the vertical radiant tube annealing furnace is controlled within +/-5 ℃ is realized.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned in part by the practice of the application.
According to a first aspect of an embodiment of the present application, there is provided a method for setting a temperature of a radiant tube heating section of a vertical annealing furnace, the method including: constructing a regional temperature setting model based on the set temperature of the strip steel 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 zone temperature correction model based on a deviation value of the actual temperature of the strip steel at the outlet of the heating section of the annealing furnace and the set temperature and a zone temperature adjustment factor, wherein the zone temperature adjustment factor is used for guiding and adjusting the temperature of each zone of the heating section of the annealing furnace; and 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.
In one embodiment of the present application, based on the foregoing, before building the region 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 annealing furnace heating section into N areas, wherein the first heating section comprises M areas, the second heating section comprises N-M areas, wherein M, N is a natural number, and M is smaller than N.
In one embodiment of the present application, based on the foregoing aspect, the region temperature setting model includes:
Figure BDA0004043285230000021
/>
Figure BDA0004043285230000022
wherein T is ZM_1 A temperature set point for a first zone of the first heating section in degrees celsius; t (T) sp The temperature of the strip steel at the outlet of the heating section of the annealing furnace is set as the unit of the temperature; p (P) HD The heat load output is set for heating sections with different specifications, and the unit is; t (T) ZM_M The temperature set point is the last zone of the first heating section, and is expressed in terms of ℃.
In an embodiment of the present application, based on the foregoing solution, the area temperature setting model further includes:
Figure BDA0004043285230000023
Figure BDA0004043285230000024
Figure BDA0004043285230000025
wherein T is ZM_M+1 Setting the temperature of the first area of the second heating section in the unit of DEG C; t (T) ZM_N Setting the temperature of the last area of the second heating section in the unit of DEG C; t (T) ZM_j The temperature set point is given as the j-th zone of the heating section in degrees centigrade.
In one embodiment of the present application, based on the foregoing solution, the area temperature correction model includes:
T ZLL_j ＝T sp +ΔT ZLL_j ，
T ZHL_j ＝T sp +ΔT ZHL_j
wherein T is ZLL_j Setting a lower limit for the temperature of a jth zone of the heating section in the unit of DEG C; t (T) ZHL_j The upper limit of the temperature set value of the jth zone of the heating section is set in the unit of DEG C.
In an embodiment of the present application, based on the foregoing solution, the area temperature correction model further includes:
Figure BDA0004043285230000031
wherein T is Zsp_j The temperature set value of the jth region of the heating section after correction in the automatic mode is given in the unit of DEG C; t (T) Z_max The maximum zone temperature set point is given in degrees celsius; f (f) TV_j The temperature adjustment factors of the regions under different furnace conditions are related to the specification, the speed and the annealing temperature of the strip steel, and have no dimension; delta T S The deviation between the actual temperature of the strip steel at the outlet of the heating section and the set value is given by the unit of DEG C; delta T LL The deviation control lower limit of the actual temperature of the strip steel at the outlet of the heating section and the set value is given in the unit of DEG C; delta T HL The upper limit of the deviation control of the actual value and the set value of the temperature of the strip steel at the outlet of the heating section is expressed in the unit of DEG C.
In an embodiment of the present application, based on the foregoing solution, the area temperature correction model further includes:
Figure BDA0004043285230000032
/>
Figure BDA0004043285230000033
wherein f TV_1 A temperature adjustment factor of a first area of the first heating section is dimensionless; f (f) 1_50 At a heat load output of 50%, the first heating section is a first heating sectionIndividual zone temperature adjustment factors, dimensionless; p (P) strip The actual heat load output of the heating sections with different specifications is related to the width, thickness, running speed and outlet strip steel temperature set values of the heating sections, and the unit is; f (f) 1_75 When the heat load output is 75%, the temperature adjustment factor of the first area of the first heating section is dimensionless; f (f) 1_100 When the heat load output is 100%, the temperature adjustment factor of the first area of the first heating section is dimensionless; f (f) TV_M The temperature adjustment factor of the last area of the first heating section is dimensionless; f (f) M_50 When the heat load output is 50%, the temperature adjustment factor of the last area of the first heating section is dimensionless; f (f) M_75 When the heat load output is 75%, the temperature adjustment factor of the last area of the first heating section is dimensionless; f (f) M_100 When the heat load output is 100%, the temperature adjustment factor of the last area of the first heating section is dimensionless.
In an embodiment of the present application, based on the foregoing solution, the area temperature correction model further includes:
Figure BDA0004043285230000041
Figure BDA0004043285230000042
Figure BDA0004043285230000043
wherein f TV_M+1 A temperature adjustment factor of a first area of the second heating section is dimensionless; f (f) M+1_50 When the heat load output is 50%, the temperature adjustment factor of the first area of the second heating section is dimensionless; f (f) M+1_75 When the heat load output is 75%, the temperature adjustment factor of the first area of the second heating section is dimensionless; f (f) M+1_100 When the heat load output is 100%, the temperature adjustment factor of the first area of the second heating section is dimensionless; f (f) TV_N The temperature adjustment factor of the last area of the second heating section is dimensionless; f (f) N_50 When the heat load output is 50%, the temperature adjustment factor of the last area of the second heating section is dimensionless; f (f) N_75 When the heat load output is 75%, the temperature adjustment factor of the last area of the second heating section is dimensionless; f (f) N_100 When the heat load output is 100%, the temperature adjustment factor of the last area of the second heating section is dimensionless; f (f) TV_j The temperature adjustment factor of the jth zone of the heating section is dimensionless.
In one embodiment of the present application, based on the foregoing scheme, the method further includes: based on the heat load output of the annealing furnace heating section and the heat load output of the radiant tube, a plate Wen Ouwen cooperative control model is constructed.
In one embodiment of the present application, based on the foregoing, the plate Wen Ouwen cooperative control model includes:
P zone_i ＝F 3 (T Zsp_j )，
P i ＝min(F 2 (T tube_i ),P zone_i )
wherein P is zone_i The unit is the output of the ith column of heat load of the heating section in the regional temperature mode; f (F) 3 (T Zsp_j ) The output of the zone temperature controller is related to the zone temperature set value and the measured value, and the unit is; p (P) i In order to consider the heating section ith column heat load output after pipe temperature amplitude limitation, the unit is; f (F) 2 (T tube_i ) The heat load output of the ith tube array temperature controller of the heating section is expressed as%.
In the technical scheme provided by the application, a regional temperature setting model is constructed based on the set temperature of strip steel 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 zone temperature correction model based on a deviation value of the actual temperature of the strip steel at the outlet of the heating section of the annealing furnace and the set temperature and a zone temperature adjustment factor, wherein the zone temperature adjustment factor is used for guiding and adjusting the temperature of each zone of the heating section of the annealing furnace; and 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. Based on the above, the technical scheme provided by the application can realize the function of real-time adjustment of the heat supply of the strip steel in the continuous heating process by establishing the regional temperature setting model under different furnace conditions, and correct the model temperature setting value by combining the regional temperature correction model, so that the fluctuation range of the strip steel temperature during the transition of the steel grade can be controlled within +/-5 ℃.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is apparent that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:
FIG. 1 shows a flow chart of a method for setting the temperature of a radiant tube heating section of a vertical annealing furnace in an embodiment of the present application;
FIG. 2 shows a schematic diagram of a heating section of a continuous annealing furnace in one embodiment of the present application;
FIG. 3 is a graph showing the relationship between the zone temperature of the continuous annealing furnace and the heat load output and annealing temperature of the heating zone in one embodiment of the present application;
FIG. 4 shows a trend of temperature set points in a heating section of a continuous annealing furnace according to one embodiment of the present application;
FIG. 5 is a graph showing monitoring of temperature process control parameters of a heating section when continuously annealing a plain plate to high strength steel in one embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the present application. One skilled in the relevant art will recognize, however, that the aspects of the application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the application.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
It should be noted that: references herein to "a plurality" means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., a and/or B may represent: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so used may be interchanged where appropriate such that the embodiments of the present application described herein may be implemented in sequences other than those illustrated or described.
The implementation details of the technical solutions of the embodiments of the present application are described in detail below:
fig. 1 shows a flowchart of a method for setting the temperature of a radiant tube heating section of a vertical annealing furnace in an embodiment of the present application.
As shown in FIG. 1, the method for setting the temperature of the radiant tube heating section of the vertical annealing furnace at least comprises steps 110 to 150.
The following will describe the steps 110 to 150 shown in fig. 1 in detail:
in step 110, a zone temperature setting model is constructed based on the set temperature of the exit strip of the annealing furnace heating section and the heat load output of the annealing furnace heating section.
With continued reference to fig. 1, in step 130, a zone temperature correction model is constructed based on the deviation value of the actual temperature of the strip steel at the outlet of the annealing furnace heating section from the set temperature and a zone temperature adjustment factor for guiding the adjustment of the temperature of each zone of the annealing furnace heating section.
With continued reference to FIG. 1, in step 150, a temperature of the radiant tube heating section of the vertical lehr is determined based on the zone temperature set model and the zone temperature correction model.
In one embodiment of the present application, before building the zone temperature setting model, the method further comprises: 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 comprises M areas, the second heating section comprises N-M areas, wherein M, N is a natural number, and M is smaller than N.
In the application, the heating section of the annealing furnace is divided into N areas, the heating section can be divided into a plurality of areas according to a set length, the heating section can be divided into a plurality of areas according to a set number of turning back rollers, and the set length and the set number can be set according to actual needs.
In the application, at least one thermocouple or other thermometer is arranged in each region obtained by dividing the heating section so as to obtain the strip steel temperature of each region.
In one embodiment of the present application, the zone temperature setting model includes:
Figure BDA0004043285230000071
Figure BDA0004043285230000072
wherein T is ZM_1 A temperature set point for a first zone of the first heating section in degrees celsius; t (T) sp The temperature of the strip steel at the outlet of the heating section of the annealing furnace is set as the unit of the temperature; p (P) HD The heat load output is set for heating sections with different specifications, and the unit is; t (T) ZM_M The temperature set point for the last zone of the first heating section is given in c.
In the application, the set heat load output of the heating sections with different specifications is related to parameters such as the width, thickness, running speed, temperature set value of the strip steel at the outlet of the heating section and the like.
According to the method, temperature set values of a first area and a last area of a first heating section are determined according to set heat load output of heating sections of different specifications and set temperatures of strip steel at an outlet of the heating section of an annealing furnace, the strip steel is heated through an operation side burner and a driving side burner in the annealing furnace, and the temperature of the strip steel in the first area and the last area of the first heating section is adjusted to the corresponding temperature set values.
In one embodiment of the present application, the region temperature setting model further includes:
Figure BDA0004043285230000081
Figure BDA0004043285230000082
Figure BDA0004043285230000083
wherein T is ZM_M+1 Setting the temperature of the first area of the second heating section in the unit of DEG C; t (T) ZM_N Setting the temperature of the last area of the second heating section in the unit of DEG C; t (T) ZM_j The temperature set point is given as the j-th zone of the heating section in degrees centigrade.
In the application, according to the set heat load output of the heating sections with different specifications and the set temperature of the strip steel at the outlet of the heating section of the annealing furnace, the temperature set values of the first area, the last area and other areas of the second heating section are determined, the strip steel is heated through the operation side burner and the driving side burner in the annealing furnace, and the strip steel temperature in the first area, the last area and other areas of the second heating section is adjusted to the corresponding temperature set values.
In one embodiment of the present application, the region temperature correction model includes:
T ZLL_j ＝T sp +ΔT ZLL_j ，
T ZHL_j ＝T sp +ΔT ZHL_j
wherein T is ZLL_j Setting a lower limit for the temperature of a jth zone of the heating section in the unit of DEG C; t (T) ZHL_j The upper limit of the temperature set value of the jth zone of the heating section is set in the unit of DEG C.
In the application, the lower limit of the temperature set value of the jth zone of the heating section is in the range of-400 to 50 ℃, and the upper limit of the temperature set value of the jth zone of the heating section is in the range of 0 to 200 ℃.
In one embodiment of the present application, the region temperature correction model further includes:
Figure BDA0004043285230000091
wherein T is Zsp_j The temperature set value of the jth region of the heating section after correction in the automatic mode is given in the unit of DEG C; t (T) Z_max The maximum zone temperature set point is given in degrees celsius; f (f) TV_j The temperature adjustment factors of the regions under different furnace conditions are related to the specification, the speed and the annealing temperature of the strip steel, and have no dimension; delta T S The deviation between the actual temperature of the strip steel at the outlet of the heating section and the set value is given by the unit of DEG C; delta T LL The deviation control lower limit of the actual temperature of the strip steel at the outlet of the heating section and the set value is given in the unit of DEG C; delta T HL The upper limit of the deviation control of the actual value and the set value of the temperature of the strip steel at the outlet of the heating section is expressed in the unit of DEG C.
In the application, according to the set temperature of the strip steel at the outlet of the heating section of the annealing furnace and the actual temperature of the strip steel at the outlet of the heating section of the annealing furnace, the temperature set value of each area of the heating section of the annealing furnace is adjusted so as to prevent the fluctuation range of the strip steel temperature from being overlarge.
In the application, the range of the lower limit of the deviation control of the actual value of the temperature of the strip steel at the outlet of the heating section and the set value is-20 to-2 ℃, and the range of the upper limit of the deviation control of the actual value of the temperature of the strip steel at the outlet of the heating section and the set value is 2 to 20 ℃.
In one embodiment of the present application, the region temperature correction model further includes:
Figure BDA0004043285230000092
Figure BDA0004043285230000093
wherein f TV_1 A temperature adjustment factor of a first area of the first heating section is dimensionless; f (f) 1_50 When the heat load output is 50%, the temperature adjustment factor of the first area of the first heating section is dimensionless; p (P) strip To be differentThe actual heat load output of the specification heating section is related to the width, thickness, running speed and temperature set value of the strip steel at the outlet of the heating section, and the unit is; f (f) 1_75 When the heat load output is 75%, the temperature adjustment factor of the first area of the first heating section is dimensionless; f (f) 1_100 When the heat load output is 100%, the temperature adjustment factor of the first area of the first heating section is dimensionless; f (f) TV_M The temperature adjustment factor of the last area of the first heating section is dimensionless; f (f) M_50 When the heat load output is 50%, the temperature adjustment factor of the last area of the first heating section is dimensionless; f (f) M_75 When the heat load output is 75%, the temperature adjustment factor of the last area of the first heating section is dimensionless; f (f) M_100 When the heat load output is 100%, the temperature adjustment factor of the last area of the first heating section is dimensionless.
In the present application, when the heat load output is 50%, the value range of the first region temperature adjustment factor of the first heating section is 1 to 1.2, when the heat load output is 75%, the value range of the first region temperature adjustment factor of the first heating section is 1 to 1.4, and when the heat load output is 100%, the value range of the first region temperature adjustment factor of the first heating section is 1 to 1.6.
In the application, when the heat load output is 50%, the value range of the temperature adjustment factor of the last area of the first heating section is 1-1.2, when the heat load output is 75%, the value range of the temperature adjustment factor of the last area of the first heating section is 1-1.4, and when the heat load output is 100%, the value range of the temperature adjustment factor of the last area of the first heating section is 1-1.6.
In one embodiment of the present application, the region temperature correction model further includes:
Figure BDA0004043285230000101
Figure BDA0004043285230000102
Figure BDA0004043285230000103
wherein f TV_M+1 A temperature adjustment factor of a first area of the second heating section is dimensionless; f (f) M+1_50 When the heat load output is 50%, the temperature adjustment factor of the first area of the second heating section is dimensionless; f (f) M+1_75 When the heat load output is 75%, the temperature adjustment factor of the first area of the second heating section is dimensionless; f (f) M+1_100 When the heat load output is 100%, the temperature adjustment factor of the first area of the second heating section is dimensionless; f (f) TV_N The temperature adjustment factor of the last area of the second heating section is dimensionless; f (f) N_50 When the heat load output is 50%, the temperature adjustment factor of the last area of the second heating section is dimensionless; f (f) N_75 When the heat load output is 75%, the temperature adjustment factor of the last area of the second heating section is dimensionless; f (f) N_100 When the heat load output is 100%, the temperature adjustment factor of the last area of the second heating section is dimensionless; f (f) TV_j The temperature adjustment factor of the jth zone of the heating section is dimensionless.
In the present application, when the heat load output is 50%, the value range of the first region temperature adjustment factor of the second heating section is 1 to 1.2, when the heat load output is 75%, the value range of the first region temperature adjustment factor of the second heating section is 1 to 1.4, and when the heat load output is 100%, the value range of the first region temperature adjustment factor of the second heating section is 1 to 1.6.
In the application, when the heat load output is 50%, the value range of the temperature adjustment factor of the last area of the second heating section is 1-1.2, when the heat load output is 75%, the value range of the temperature adjustment factor of the last area of the second heating section is 1-1.4, and when the heat load output is 100%, the value range of the temperature adjustment factor of the last area of the second heating section is 1-1.6.
In one embodiment of the present application, the method further comprises: based on the heat load output of the annealing furnace heating section and the heat load output of the radiant tube, a plate Wen Ouwen cooperative control model is constructed.
In one embodiment of the present application, the plate Wen Ouwen cooperative control model includes:
P zone_i ＝F 3 (T Zsp_j )，
P i ＝min(F 2 (T tube_i ),P zone_i )
wherein P is zone_i The unit is the output of the ith column of heat load of the heating section in the regional temperature mode; f (F) 3 (T Zsp_j ) The output of the zone temperature controller is related to the zone temperature set value and the measured value, and the unit is; p (P) i In order to consider the heating section ith column heat load output after pipe temperature amplitude limitation, the unit is; f (F) 2 (T tube_i ) The heat load output of the ith tube array temperature controller of the heating section is expressed as%.
In the application, 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 region where the heat load output is located in the region temperature mode, and 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 region temperature of the region where the radiant tube is located, so that the temperature of the radiant tube is prevented from being too high.
In order to make it easier for the person skilled in the art to understand the present application, the present application will be described in a specific embodiment with reference to fig. 2 to 5.
FIG. 2 shows a schematic diagram of a heating section of a continuous annealing furnace in one embodiment of the present application.
FIG. 3 is a graph showing the relationship between the zone temperature of the continuous annealing furnace and the heat load output and annealing temperature of the heating zone in one embodiment of the present application.
FIG. 4 shows a graph of the trend of the temperature set point in the heating zone of the continuous annealing furnace in one embodiment of the present application.
FIG. 5 is a graph showing monitoring of temperature process control parameters of a heating section when continuously annealing a plain plate to high strength steel in one embodiment of the present application.
Taking the first-steel Beijing Tang Lengga operation section 2230 continuous annealing unit as an example, the heating section has 30 rows of radiant tubes in total, and 15 areas (n=15) in total, wherein: a total of 9 zones (m=9) of the first heating section; the second heating section is 6 zones total, as shown in figure 2.
According to the zone temperature setting model, the relation between the temperature of the first zone of the inlet and the last zone of the outlet of the first heating section and the second heating section of the continuous annealing furnace of the first steel Beijing Tang 2230, the annealing temperature and the heat load output can be obtained, as shown in figure 3.
According to the regional temperature setting model, the temperature change trend of each region of the heating section under different specifications, speeds and annealing temperatures of the continuous annealing of the first steel Beijing Tang 2230 can be obtained, as shown in fig. 4. As can be seen from the figure, 1) the temperature gradually increases from the heating inlet to the outlet region; 2) The range of the temperature change of the first heating section area is higher than that of the second heating section along with the change of the furnace condition.
2230 continuous annealing furnace heating section maximum zone temperature set value T z_max 930 ℃; actual temperature and set value deviation control lower limit delta T of strip steel at outlet of heating section LL Upper limit delta T HL The upper and lower limits of the zone temperature set values are shown in table 1, the temperature adjustment factors of the different heat load output zones are shown in table 2, and the 2230 continuous annealing furnace obtains the heat load output of each zone according to a plate Wen Ouwen cooperative control model and is shown in table 3.
As shown in table 4, table 4 shows the fluctuation of the DP1180 heating section outlet plate temperature control in the 2230 continuous annealing plate temperature zone temperature cooperative pre-control mode, and the table shows that: the head, middle and tail plates Wen Junzhi fluctuate within + -3 ℃ and the peak fluctuation within + -5 ℃.
Fig. 5 shows the temperature control of the heating section in the high-strength transition of the common plate at a constant speed in the 2230 continuous annealing furnace zone. The 19:48 furnace zone was subjected to steel grade transition from 1.2 x 1209mm to 1.2 x 1209mm, and the weld was passed through the heating zone at 19:52, which indicated a 4.8 ℃ rise after the weld was passed through the heating zone, with a 7.2 ℃ reduction in fluctuation compared to 12 ℃ before improvement.
In summary, the setting method of the band steel temperature of the radiant tube heating section of the vertical annealing furnace provided by the application realizes the function of real-time adjustment of the heat supply of the band steel in the continuous heating process by establishing the regional temperature setting model under different furnace conditions, and can control the fluctuation range of the band steel temperature within +/-5 ℃ when the steel grade is in transition by combining with the plate temperature controller to correct the model setting value.
Heating section region j T ZLL_j T ZHL_j Heating section region j T ZLL_j T ZHL_j
1 T sp -324 T sp +100 9 T sp -94 T sp +120
2 T sp -274 T sp +120 10 T sp -28 T sp +110
3 T sp -211 T sp +140 11 T sp +10 T sp +170
4 T sp -164 T sp +160 12 T sp +20 T sp +160
5 T sp -130 T sp +140 13 T sp +30 T sp +150
6 T sp -113 T sp +140 14 T sp +20 T sp +150
7 T sp -127 T sp +140 15 T sp +20 T sp +155
8 T sp -132 T sp +130
TABLE 1
Figure BDA0004043285230000131
TABLE 2
Figure BDA0004043285230000132
/>
Figure BDA0004043285230000141
TABLE 3 Table 3
Figure BDA0004043285230000151
TABLE 4 Table 4
In one or more technical solutions provided in the embodiments of the present application, at least the following technical effects or advantages are provided:
according to the technical scheme, the function of real-time regulation of the heat supply of the strip steel continuous heating process is realized by establishing the regional temperature setting models under different furnace conditions, the regional temperature correction models are combined to correct the model temperature setting values, and the strip steel temperature fluctuation range during steel grade transition can be controlled within +/-5 ℃.
The application also provides a setting device of vertical annealing stove radiant tube heating section temperature, the device includes: a first construction unit for constructing a zone temperature setting model based on the set temperature of the strip steel at the outlet of the heating section of the annealing furnace and the heat load output of the heating section of the annealing furnace; the second construction unit is used for constructing a zone temperature correction model based on the deviation value of the actual temperature of the strip steel at the outlet of the heating section of the annealing furnace and the set temperature and a zone temperature adjustment factor, wherein the zone temperature adjustment factor is used for guiding and adjusting the temperature of each zone of the heating section of the annealing furnace; a determining unit for determining the temperature of the radiant tube heating section of the vertical annealing furnace based on the region temperature setting model and the region temperature correction model.
The present application also provides a computer program product comprising computer instructions stored in a computer readable storage medium and adapted to be read and executed by a processor to cause a computer device having the processor to perform a method of setting the temperature of a radiant tube heating section of a vertical annealing furnace as described in the above embodiments.
The present application also provides a computer-readable medium that may be embodied in an electronic device; or may exist alone without being assembled into an 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 radiant tube heating section of the vertical annealing furnace described in the above embodiment.
The application also provides electronic equipment, which comprises one or more processors and one or more memories, wherein at least one program code is stored in the one or more memories, and the at least one program code is loaded and executed by the one or more processors so as to realize the setting method of the temperature of the radiant tube heating section of the vertical annealing furnace.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains.
Furthermore, the above-described figures are only illustrative of the processes involved in the method according to exemplary embodiments of the present application, and are not intended to be limiting. It will be readily appreciated that the processes shown in the above figures do not indicate or limit the temporal order of these processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, for example, among a plurality of modules.
It is to be understood that the present application is not limited to the precise construction set forth above and shown in the drawings, and that various modifications and changes may be effected therein without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. The method for setting the temperature of the radiant tube heating section of the vertical annealing furnace is characterized by comprising the following steps:
constructing a regional temperature setting model based on the set temperature of the strip steel 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 zone temperature correction model based on a deviation value of the actual temperature of the strip steel at the outlet of the heating section of the annealing furnace and the set temperature and a zone temperature adjustment factor, wherein the zone temperature adjustment factor is used for guiding and adjusting the temperature of each zone of the heating section of the annealing furnace;
and 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.
2. The method of claim 1, wherein prior to constructing the zone temperature set model, the method further comprises:
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 comprises M areas, the second heating section comprises N-M areas, wherein M, N is a natural number, and M is smaller than N.
3. The method of claim 2, wherein the zone temperature setting model comprises:
Figure FDA0004043285220000011
wherein T is ZM_1 A temperature set point for a first zone of the first heating section in degrees celsius; t (T) sp The temperature of the strip steel at the outlet of the heating section of the annealing furnace is set as the unit of the temperature; p (P) HD The heat load output is set for heating sections with different specifications, and the unit is; t (T) ZM_M The temperature set point is the last zone of the first heating section, and is expressed in terms of ℃.
4. The method of claim 3, wherein the zone temperature setting model further comprises:
Figure FDA0004043285220000012
Figure FDA0004043285220000021
wherein T is ZM_M+1 Setting the temperature of the first area of the second heating section in the unit of DEG C; t (T) ZM_N Setting the temperature of the last area of the second heating section in the unit of DEG C; t (T) ZM_j The temperature set point is given as the j-th zone of the heating section in degrees centigrade.
5. The method of claim 4, wherein the zone temperature correction model comprises:
Figure FDA0004043285220000022
wherein T is ZLL_j Setting a lower limit for the temperature of a jth zone of the heating section in the unit of DEG C; t (T) ZHL_j The upper limit of the temperature set value of the jth zone of the heating section is set in the unit of DEG C.
6. The method of claim 5, wherein the zone temperature correction model further comprises:
Figure FDA0004043285220000023
wherein T is Zsp_j The temperature set value of the jth region of the heating section after correction in the automatic mode is given in the unit of DEG C; t (T) Z_max The maximum zone temperature set point is given in degrees celsius; f (f) TV_j The temperature adjustment factors of the regions under different furnace conditions are related to the specification, the speed and the annealing temperature of the strip steel, and have no dimension; delta T S The deviation between the actual temperature of the strip steel at the outlet of the heating section and the set value is given by the unit of DEG C; delta T LL The deviation control lower limit of the actual temperature of the strip steel at the outlet of the heating section and the set value is given in the unit of DEG C; delta T HL The upper limit of the deviation control of the actual value and the set value of the temperature of the strip steel at the outlet of the heating section is expressed in the unit of DEG C.
7. The method of claim 6, wherein the zone temperature correction model further comprises:
Figure FDA0004043285220000031
wherein f TV_1 A temperature adjustment factor of a first area of the first heating section is dimensionless; f (f) 1_50 At a heat load output of 50%, the first region of the first heating sectionTemperature adjustment factor, dimensionless; p (P) strip The actual heat load output of the heating sections with different specifications is related to the width, thickness, running speed and outlet strip steel temperature set values of the heating sections, and the unit is; f (f) 1_75 When the heat load output is 75%, the temperature adjustment factor of the first area of the first heating section is dimensionless; f (f) 1_100 When the heat load output is 100%, the temperature adjustment factor of the first area of the first heating section is dimensionless; f (f) TV_M The temperature adjustment factor of the last area of the first heating section is dimensionless; f (f) M_50 When the heat load output is 50%, the temperature adjustment factor of the last area of the first heating section is dimensionless; f (f) M_75 When the heat load output is 75%, the temperature adjustment factor of the last area of the first heating section is dimensionless; f (f) M_100 When the heat load output is 100%, the temperature adjustment factor of the last area of the first heating section is dimensionless.
8. The method of claim 7, wherein the zone temperature correction model further comprises:
Figure FDA0004043285220000032
/>
Figure FDA0004043285220000041
wherein f TV_M+1 A temperature adjustment factor of a first area of the second heating section is dimensionless; f (f) M+1_50 When the heat load output is 50%, the temperature adjustment factor of the first area of the second heating section is dimensionless; f (f) M+1_75 When the heat load output is 75%, the temperature adjustment factor of the first area of the second heating section is dimensionless; f (f) M+1_100 When the heat load output is 100%, the temperature adjustment factor of the first area of the second heating section is dimensionless; f (f) TV_N The temperature adjustment factor of the last area of the second heating section is dimensionless; f (f) N_50 Output for heat load 50%When the temperature of the last area of the second heating section is adjusted by a temperature adjustment factor, the temperature is dimensionless; f (f) N_75 When the heat load output is 75%, the temperature adjustment factor of the last area of the second heating section is dimensionless; f (f) N_100 When the heat load output is 100%, the temperature adjustment factor of the last area of the second heating section is dimensionless; f (f) TV_j The temperature adjustment factor of the jth zone of the heating section is dimensionless.
9. The method of claim 8, wherein the method further comprises:
based on the heat load output of the annealing furnace heating section and the heat load output of the radiant tube, a plate Wen Ouwen cooperative control model is constructed.
10. The method of claim 9, wherein the plate Wen Ouwen cooperative control model comprises:
Figure FDA0004043285220000042
wherein P is zone_i The unit is the output of the ith column of heat load of the heating section in the regional temperature mode; f (F) 3 (T Zsp_j ) The output of the zone temperature controller is related to the zone temperature set value and the measured value, and the unit is; p (P) i In order to consider the heating section ith column heat load output after pipe temperature amplitude limitation, the unit is; f (F) 2 (T tube_i ) The heat load output of the ith tube array temperature controller of the heating section is expressed as%.
CN202310036134.8A 2023-01-08 2023-01-08 Setting method for temperature of heating section of radiant tube of vertical annealing furnace Pending CN116103484A (en)

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