CN113046547B - Annealing furnace heating control method and device - Google Patents
Annealing furnace heating control method and device Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- 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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- 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
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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
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Abstract
The invention relates to the technical field of annealing furnace heating control, in particular to an annealing furnace heating control method and device. The method comprises the following steps: obtaining target output power of the heating section; if the heating output lower limit value of the target burner group is not greater than the heating output lower limit value of the target burner group, all burners in the target burner group are closed; if the heating output upper limit value of the target burner group is not smaller than the heating output upper limit value of the target burner group, all burners in the target burner group are started; if the output power is larger than the lower limit value of the heating output and smaller than the upper limit value of the heating output, the opening and closing of the burners in the target burner group are controlled according to the target output power. According to the invention, the opening and closing of the burners of the target burner group are controlled according to the target output power of the heating section, the heating output lower limit value and the heating output upper limit value of the target burner group, when the target output power is smaller, all the burners of the target burner group are closed, and when the target output power is larger, all the burners of the target burner group are opened, so that the opening and closing times of the burners are reduced, and the heating control stability of the annealing furnace is improved.
Description
Technical Field
The invention relates to the technical field of annealing furnace heating control, in particular to an annealing furnace heating control method and device.
Background
The annealing furnace is internally provided with a plurality of heating sections, each heating section is internally provided with a plurality of rows of burners, strip steel is annealed through the heating sections in sequence, the burners are required to be repeatedly turned on and turned off in the process, and the temperature of each heating section is adjusted. When the annealing furnace is heated and controlled, if the heating control output is unstable, frequent opening and closing of the burner are caused, deformation and cracking of a radiant tube in the burner due to quenching and rapid heating can be caused, consumption of an ignition electrode and a control valve is increased, abnormal fluctuation of gas pressure in a heating pipeline is increased, and production of variety steel sensitive to the atmosphere in the furnace is affected.
Therefore, how to improve the stability of the heating control of the annealing furnace is a technical problem to be solved at present.
Disclosure of Invention
The invention aims to provide a heating control method and a heating control device for an annealing furnace, so as to improve the stability of heating control of the annealing furnace.
In order to achieve the above object, the embodiments of the present invention provide the following solutions:
in a first aspect, an embodiment of the present invention provides a method for controlling heating of an annealing furnace, including:
preprocessing the heating output power of a heating section to obtain the target output power of the heating section;
if the target output power is not greater than the heating output lower limit value of the target burner group, all burners in the target burner group are closed; wherein the target burner group is any burner group in the heating section;
if the target output power is not smaller than the heating output upper limit value of the target burner group, starting all burners in the target burner group;
and if the target output power is larger than the heating output lower limit value and the target output power is smaller than the heating output upper limit value, controlling the opening and closing of the burners in the target burner group according to the target output power.
In a possible embodiment, the controlling, according to the target output power, opening and closing of the burners in the target burner group includes:
calculating the current output power P of the target burner group i The specific calculation formula is as follows:
P i ＝[(100-P i-LL )/(P i-HL -P i-LL )]·(P f -P i-LL )；
wherein ,Pf Outputting power for the target; p (P) i-LL A lower limit value for the heating output; p (P) i-HL An upper limit value for the heating output;
according to the current output power P i And controlling the opening and closing of the burners in the target burner group.
In a possible embodiment, the method further includes, before the preprocessing the heating output power of the heating section to obtain the target output power of the heating section:
calculating the heating output lower limit value P i-LL The specific calculation formula is as follows:
P i-LL ＝λ 2 ·i·P max /(N-1)；
i is the serial number of the target burner group in the heating section; p (P) max Setting output power limiting for the burner group; lambda (lambda) 2 To adjust parameters; and N is the total number of burner groups in the heating section.
In a possible embodiment, the method further includes, before the preprocessing the heating output power of the heating section to obtain the target output power of the heating section:
calculating the heating output upper limit value P i-HL The specific calculation formula is as follows:
wherein ,λ1 Is a proportional parameter.
In a possible embodiment, the preprocessing the heating output power of the heating section to obtain the target output power of the heating section includes:
performing difference processing on the heating output power by using a secondary linear difference method to obtain a softened output power;
performing linear processing on the heating output power and the softening output power by using a linear formula to obtain target output power of the heating section; wherein the linear formula is:
P f ＝(1-λ 1 )·P 0 +λ 1 ·P 1 ；
wherein ,P0 -outputting power for said heating; p (P) 1 And outputting power for the softening.
In a possible embodiment, the method further includes, before the preprocessing the heating output power of the heating section to obtain the target output power of the heating section:
calculating the ratio parameter lambda 1 The specific calculation formula is as follows:
wherein ,λ1-min Is a low heat load yield proportional parameter; lambda (lambda) 1-max Is a high heat load yield proportional parameter; PR (PR) λ-min Setting a lower limit value of yield control; PR (PR) λ-max Setting a yield control upper limit value; PR (PR) s The current strip steel yield of the annealing furnace is obtained.
In a second aspect, an embodiment of the present invention provides an annealing furnace heating control device, including:
the pretreatment module is used for carrying out pretreatment on the heating output power of the heating section to obtain the target output power of the heating section;
the first control module is used for closing all burners in the target burner group when the target output power is not greater than the heating output lower limit value of the target burner group; wherein the target burner group is any burner group in the heating section;
the second control module is used for starting all burners in the target burner group when the target output power is not smaller than the heating output upper limit value of the target burner group;
and the third control module is used for controlling the opening and closing of the burners in the target burner group according to the target output power when the target output power is larger than the heating output lower limit value and the target output power is smaller than the heating output upper limit value.
In one possible embodiment, the third control module includes:
a first calculation module for calculating the current output power P of the target burner group i The specific calculation formula is as follows:
P i ＝[(100-P i-LL )/(P i-HL -P i-LL )]·(P f -P i-LL )；
wherein ,Pf Outputting power for the target; p (P) i-LL A lower limit value for the heating output; p (P) i-HL An upper limit value for the heating output;
an opening and closing control module for controlling the current output power P i And controlling the opening and closing of the burners in the target burner group.
In one possible embodiment, the apparatus further comprises:
a second calculation module for calculating the heating output lower limit value P before the pretreatment module works i-LL The specific calculation formula is as follows:
P i-LL ＝λ 2 ·i·P max /(N-1)；
i is the serial number of the target burner group in the heating section; p (P) max Setting output power limiting for the burner group; lambda (lambda) 2 To adjust parameters; and N is the total number of burner groups in the heating section.
In one possible embodiment, the apparatus further comprises:
a third calculation module for calculating the heating output upper limit value P before the pretreatment module works i-HL The specific calculation formula is as follows:
wherein ,λ11 Is a proportional parameter.
In one possible embodiment, the preprocessing module includes:
the first acquisition module is used for carrying out difference processing on the heating output power by utilizing a secondary linear difference method to obtain a softened output power;
the second acquisition module is used for carrying out linear processing on the heating output power and the softening output power by utilizing a linear formula to obtain the target output power of the heating section; wherein the linear formula is:
P f ＝(1-λ1 1 )·P 0 +λ 1 ·P 1 ；
wherein ,P0 -outputting power for said heating; p (P) 1 And outputting power for the softening.
In one possible embodiment, the apparatus further comprises:
a third calculation module for calculating the ratio parameter lambda before the preprocessing module works 1 The specific calculation formula is as follows:
wherein ,λ1-min Is a low heat load yield proportional parameter; lambda (lambda) 1-max Is a high heat load yield proportional parameter; PR (PR) λ-min Setting a lower limit value of yield control; PR (PR) λ-max Setting a yield control upper limit value; PR (PR) s The current strip steel yield of the annealing furnace is obtained.
In a third aspect, an embodiment of the present invention provides an annealing furnace heating control apparatus, including:
a memory for storing a computer program;
a processor for executing the computer program to realize the steps of the annealing furnace heating control method described in the first aspect.
In a fourth aspect, embodiments of the present invention provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the lehr heating control method described in the first aspect.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, the heating output power is preprocessed to obtain the target output power of the soft and smooth heating section, then the opening and closing of the burners of the target burner group are controlled according to the target output power of the heating section, the heating output lower limit value and the heating output upper limit value of the target burner group, when the target output power is smaller, all the burners of the target burner group are closed, and when the target output power is larger, all the burners of the target burner group are opened, so that the opening and closing times of the burners in the heating control process of the annealing furnace are reduced, and the heating control stability of the annealing furnace is improved.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present description, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an annealing furnace heating control method provided by an embodiment of the invention;
FIG. 2 is a graph of a softened output versus a heated output provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of the distribution of the upper limit value of the heating output in the continuous annealing furnace of the first steel Beijing Tang 1700;
FIG. 4 is a graph showing the trend of heating power variation for different burner groups in different heating output distribution schemes when the running speed of the band steel in the furnace is 36 m/min;
FIG. 5 is a graph showing the trend of heating power variation for different burner groups in different heating output distribution schemes when the running speed of the band steel in the furnace is 131 m/min;
FIG. 6 is a graph showing the trend of heating power variation for different burner groups in different heating output distribution schemes when the running speed of the band steel in the furnace is 281 m/min;
fig. 7 is a schematic structural view of a heating control device of an annealing furnace according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the embodiments of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a heating control method for an annealing furnace according to an embodiment of the invention, and specifically includes steps 11 to 14.
And step 11, preprocessing the heating output power of the heating section to obtain the target output power of the heating section.
Specifically, the heating output power of the heating section can be generated by a heating section plate temperature controller for controlling the output power of the whole heating section. The output power such as the heating output power and the target output power may be in the form of specific power values, and may also be in the form of a maximum power ratio such as 10% or 20%.
The pretreatment can be flexibly selected from pretreatment modes such as smoothing treatment, difference treatment, softening treatment and the like so as to distribute the heating output power of each heating section in the annealing furnace more uniformly.
Here, a target output power acquisition scheme is given, specifically including steps 21 to 22.
And step 21, performing difference processing on the heating output power by using a secondary linear difference method to obtain flexible output power.
Specifically, in this embodiment, the correspondence between the softened output power and the heating output power is obtained by using the quadratic linear difference method in advance, so that the softened output power can be obtained according to the heating output power. Fig. 2 is a graph showing the relationship between the softened output power and the heating output power according to the embodiment of the present invention.
The softening output power can break the original heating control of the heating section plate temperature controller to the heating section, so that the heating section in the annealing furnace is more flexible in heating process, and the occurrence of frequent opening and closing of the burner caused by uneven temperature distribution in the furnace is reduced.
P f ＝(1-λ 1 )·P 0 +λ 1 ·P 1 ；
wherein ,λ1 As a proportion parameter, P 0 -outputting power for said heating; p (P) 1 And outputting power for the softening.
Specifically, the step performs linear processing on the heating output power and the softening output power to obtain the target output power of the heating section, so that the target output power contains all or part of the softening output power to cope with different application scenes.
Proportional parameter lambda 1 The non-dimensional parameters can be preset, and can be dynamically generated according to the yield of strip steel in the annealing furnace, so that the generated target output power meets the requirements of different strip steel yields, and the method specifically comprises the step 31.
Step 31, calculating the ratio parameter lambda 1 The specific calculation formula is as follows:
wherein ,λ1-min Is a low heat load yield proportional parameter; lambda (lambda) 1-max Is a high heat load yield proportional parameter; PR (PR) λ-min Setting a lower limit value of yield control; PR (PR) λ-max Setting a yield control upper limit value; PR (PR) s The current strip steel yield of the annealing furnace is obtained.
Wherein the low heat load yield ratio parameter lambda 1-min And a high heat load yield ratio parameter lambda 1-max Are dimensionless parameters and can be preset, and the low heat load output ratio parameter lambda 1-min Can be in the range of 0 to 0.8, the high heat load yield ratio parameter lambda 1-max Can range from 0.5 to 1.
Setting a lower limit PR for yield control λ-min The design productivity of the annealing furnace per hour can be 5% -65%; setting the upper limit PR of the yield control λ-max 50% -95% of design productivity of the annealing furnace per hour can be achieved; current strip steel yield PR of annealing furnace s The method can be the hour yield of the strip steel in the furnace, and the value of the hour yield is particularly related to the thickness, the width and the running speed of the strip steel.
And step 12, if the target output power is not greater than the lower limit value of the heating output of the target burner group, closing all burners in the target burner group.
The target burner group is any burner group in the heating section.
Specifically, when the target output power is not greater than the lower limit value of the heating output of the target burner group, which means that the heating section is not required to provide too much heat at present, the number of times of starting and closing the burner can be reduced when the target output power is lower, and the stability of heating control of the annealing furnace is improved.
The lower limit value of the heating output can be preset, and can be obtained by calculation according to the specific position of the target burner group in the heating section.
Here, a calculation scheme of the heating output lower limit value is provided, specifically including step 41.
Step 41 of calculating the heating output lower limit value P i-LL The specific calculation formula is as follows:
P i-LL ＝λ 2 ·i·P max /(N-1)；
i is the serial number of the target burner group in the heating section; p (P) max Setting output power limiting for the burner group; lambda (lambda) 2 To adjust parameters; and N is the total number of burner groups in the heating section.
In particular, the heating section may include one or more burner groups, and one burner group may be disposed in the heating section in the form of a burner array. Burner group set output power limiting P max Can be 60-100% of the output power of the target burner group, and once the output power of the target burner group exceeds the set output power limit P of the burner group max The output power of the actual target burner group is forced to be 100%, that is, the full power (all burners in the burner group are turned on) is used for heating.
And step 13, if the target output power is not smaller than the heating output upper limit value of the target burner group, starting all burners in the target burner group.
Specifically, when the target output power is not smaller than the upper limit value of the heating output of the target burner group, the fact that more heat is provided by the heating section is required at present is indicated, and the number of times of starting and closing the burner can be reduced when the target output power is larger, so that the stability of heating control of the annealing furnace is improved.
The upper limit value of the heating output can be preset, and can be obtained by calculation according to the specific position of the target burner group in the heating section.
Here, a calculation scheme of the heating output upper limit value is provided, specifically including step 51.
Step 51 of calculating the heating output upper limit value P i-HL The specific calculation formula is as follows:
wherein ,λ1 Is a proportional parameter.
Specifically, the upper limit value of the soft output power
And step 14, if the target output power is greater than the heating output lower limit value and the target output power is less than the heating output upper limit value, controlling the opening and closing of the burners in the target burner group according to the target output power.
Specifically, if the target output power of the heating section is between the lower limit value and the upper limit value of the heating output, the output power is allocated to each burner group in the heating section according to the target output power of the heating section.
Here, an allocation scheme is given, specifically including steps 61 to 62.
Step 61, calculating the current output power P of the target burner group i The specific calculation formula is as follows:
P i ＝[(100-P i-LL )/(P i-HL -P i-LL )]·(P f -P i-LL )；
wherein ,Pf Outputting power for the target; p (P) i-LL A lower limit value for the heating output; p (P) i-HL An upper limit value is outputted for the heating.
The heating power of the target burner group is linearly assigned by utilizing the heating output lower limit value and the heating output upper limit value, so that the total power of the heating section is converted into the output power of each burner group, and the heating control of the heating section is realized more stably and uniformly.
Step 62, according to the current output power P i And controlling the opening and closing of the burners in the target burner group.
The scheme is successfully applied to a heating control scheme of the continuous annealing furnace of the first steel Beijing Tang 1700, wherein the specification of strip steel is 1 x 1200mm, the annealing temperature is 803 ℃, and fig. 3 is a schematic diagram showing the distribution of the upper limit value of heating output in the continuous annealing furnace of the first steel Beijing Tang 1700, and specifically, the distribution is gradually decreased from the first row of burner groups to the last row of burner groups of the heating section.
Here, this example is intended to be compared with a conventional pulse controlled lehr heating output distribution scheme to illustrate the significant advances that can be achieved by this example. Three common heating output distribution schemes of a traditional pulse control annealing furnace are as follows: proportional mode, narrow band steel mode, normal mode. Operators can select corresponding schemes according to the deviation and buckling risks of the strip steel in production. The comparison results of the flexible control scheme provided in this embodiment and the conventional three dispensing schemes are shown in table 1.
TABLE 1
Therefore, in the flexible control mode, the switching frequency of the burner is smaller than that of other three traditional control modes, and along with the increase of the output of the plate temperature controller, the switching frequency of the burner in the flexible control scheme is gradually reduced.
FIG. 4 is a graph showing the trend of heating power variation of different burner groups in different heating output distribution schemes when the running speed of the band steel in the furnace is 36m/min, wherein:
flexible control mode: the 1 st to 18 th rows of heating sections do not participate in the heating of the annealing furnace, and the output of each row is 0%; the 19 th to 25 th columns participate in the heating of the annealing furnace, and the output of each column is less than 100 percent;
traditional narrow strip steel: the 1 st to 11 th rows of heating sections participate in the heating of the annealing furnace, and the output of each row is less than 100 percent; the 12 th to 25 th columns do not participate in the heating of the annealing furnace, and the output of each column is 0%;
traditional normal mode: the 1 st to 14 th rows of the heating sections do not participate in the heating of the annealing furnace, and the output of each row is 0%; the 15 th to 25 th columns participate in the heating of the annealing furnace, and the heating output is less than 100 percent;
traditional ratio mode: the heating sections 1 to 25 rows participate in heating, and the output of each row is less than 100 percent.
FIG. 5 is a graph showing the trend of heating power variation of different burner groups in different heating output distribution schemes when the running speed of the band steel in the furnace is 131m/min, wherein:
flexible control mode: the 1 st to 11 th rows of the heating sections do not participate in the heating of the annealing furnace, and the output of each row is 0%; the 12 th to 25 th columns participate in the heating of the annealing furnace, wherein the output of the 12 th to 18 th columns is less than 100%, and the output of the 19 th to 25 th columns is equal to 100%;
traditional narrow strip steel: the 1 st to 20 th columns of the heating sections participate in the heating of the annealing furnace, and the output of each column is less than 100 percent; the 21 st to 25 th columns do not participate in the heating of the annealing furnace, and the output of each column is 0%;
traditional normal mode: the 1 st to 5 th rows of the heating sections do not participate in the heating of the annealing furnace, and the output of each row is 0%; the 6 th to 25 th columns participate in the heating of the annealing furnace, and the heating output is less than 100%;
traditional ratio mode: the heating sections 1 to 25 rows participate in heating, and the output of each row is less than 100 percent.
FIG. 6 is a graph showing the trend of heating power variation of different burner groups in different heating output distribution schemes when the running speed of the band steel in the furnace is 281m/min, wherein:
the flexible control scheme comprises the following steps: the 1 st to 3 rd columns of the heating section do not participate in the heating of the annealing furnace, and the output of each column is 0%; the 4 th to 25 th columns participate in the heating of the annealing furnace, wherein the output of the 4 th to 7 th columns is less than 100%, and the output of the 8 th to 25 th columns is equal to 100%;
traditional narrow strip steel: the heating sections 1 to 25 rows participate in heating, and the output of each row is less than 100 percent;
traditional normal protocol: the heating sections 1 to 25 rows participate in heating, and the output of each row is less than 100 percent;
traditional proportioning scheme: the heating sections 1 to 25 rows participate in heating, and the output of each row is less than 100 percent.
In a second aspect, an embodiment of the present invention provides a heating control device for an annealing furnace, and fig. 7 is a schematic structural diagram of an embodiment of the device, where the device includes:
a preprocessing module 71, configured to preprocess the heating output power of the heating section, and obtain a target output power of the heating section;
a first control module 72, configured to turn off all burners in the target burner group when the target output power is not greater than a lower limit value of heating output of the target burner group; wherein the target burner group is any burner group in the heating section;
a second control module 73, configured to turn on all burners in the target burner group when the target output power is not less than the upper limit value of the heating output of the target burner group;
and a third control module 74, configured to control opening and closing of burners in the target burner group according to the target output power when the target output power is greater than the heating output lower limit value and the target output power is less than the heating output upper limit value.
In one possible embodiment, the third control module includes:
a first calculation module for calculating the current output power P of the target burner group i The specific calculation formula is as follows:
P i ＝[(100-P i-LL )/(P i-HL -P i-LL )]·(P f -P i-LL )；
wherein ,Pf Outputting power for the target; p (P) i-LL A lower limit value for the heating output; p (P) i-HL An upper limit value for the heating output;
an opening and closing control module for controlling the current output power P i And controlling the opening and closing of the burners in the target burner group.
In one possible embodiment, the apparatus further comprises:
a second calculation module for calculating the heating output lower limit value P before the pretreatment module works i-LL The specific calculation formula is as follows:
P i-LL ＝λ 2 ·i·P max /(N-1)；
i is the serial number of the target burner group in the heating section; p (P) max Setting output power limiting for the burner group; lambda (lambda) 2 To adjust parameters; and N is the total number of burner groups in the heating section.
In one possible embodiment, the apparatus further comprises:
a third calculation module for calculating the heating output upper limit value P before the pretreatment module works i-HL The specific calculation formula is as follows:
wherein ,λ1 Is a proportional parameter.
In one possible embodiment, the preprocessing module includes:
the first acquisition module is used for carrying out difference processing on the heating output power by utilizing a secondary linear difference method to obtain a softened output power;
the second acquisition module is used for carrying out linear processing on the heating output power and the softening output power by utilizing a linear formula to obtain the target output power of the heating section; wherein the linear formula is:
P f ＝(1-λ 1 )·P 0 +λ 1 ·P 1 ；
wherein ,P0 -outputting power for said heating; p (P) 1 And outputting power for the softening.
In one possible embodiment, the apparatus further comprises:
a third calculation module for calculating the ratio parameter lambda before the preprocessing module works 1 The specific calculation formula is as follows:
wherein ,λ1-min Is a low heat load yield proportional parameter; lambda (lambda) 1-max Is a high heat load yield proportional parameter; PR (PR) λ-min Setting a lower limit value of yield control; PR (PR) λ-max Setting a yield control upper limit value; PR (PR) s The current strip steel yield of the annealing furnace is obtained.
Based on the same inventive concept as in the previous embodiments, the embodiments of the present invention further provide an annealing furnace heating control apparatus, including a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of any one of the annealing furnace heating control methods described above when executing the program.
Based on the same inventive concept as in the previous embodiments, the embodiments of the present invention also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of any of the annealing furnace heating control methods described in the previous paragraphs.
The technical scheme provided by the embodiment of the invention has at least the following technical effects or advantages:
according to the embodiment of the invention, the heating output power is preprocessed to obtain the target output power of the soft and smooth heating section, then the opening and closing of the burners of the target burner group are controlled according to the target output power of the heating section, the heating output lower limit value and the heating output upper limit value of the target burner group, when the target output power is smaller, all the burners of the target burner group are closed, and when the target output power is larger, all the burners of the target burner group are opened, so that the opening and closing times of the burners in the heating control process of the annealing furnace are reduced, and the heating control stability of the annealing furnace is improved.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (modules, systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (3)
1. A method for controlling heating of an annealing furnace, comprising:
calculating a heating output lower limit value
The specific calculation formula is as follows:
i is the serial number of the target burner group in the heating section;
setting output power limiting for the burner group; />
To adjust parameters; />
The total number of burner groups in the heating section is the total number of burner groups;
calculating the upper limit value of heating output
The specific calculation formula is as follows:
wherein ,
is a proportional parameter;
preprocessing the heating output power of a heating section to obtain the target output power of the heating section;
the preprocessing the heating output power of the heating section to obtain the target output power of the heating section comprises the following steps:
performing difference processing on the heating output power by using a secondary linear difference method to obtain a softened output power;
performing linear processing on the heating output power and the softening output power by using a linear formula to obtain target output power of the heating section; wherein the linear formula is:
wherein ,
-outputting power for said heating; />
Outputting power for the softening;
if the target output power is not greater than the heating output lower limit value of the target burner group, all burners in the target burner group are closed; wherein the target burner group is any burner group in the heating section;
if the target output power is not smaller than the heating output upper limit value of the target burner group, starting all burners in the target burner group;
if the target output power is larger than the heating output lower limit value and the target output power is smaller than the heating output upper limit value, controlling the opening and closing of burners in the target burner group according to the target output power;
and controlling the opening and closing of the burners in the target burner group according to the target output power, wherein the method comprises the following steps:
calculating the current output power of the target burner group
The specific calculation formula is as follows:
wherein ,
outputting power for the target; />
A lower limit value for the heating output; />
An upper limit value for the heating output;
according to the current output power
And controlling the opening and closing of the burners in the target burner group.
2. The annealing furnace heating control method according to claim 1, wherein said preprocessing the heating output power of the heating section, before obtaining the target output power of the heating section, the method further comprises:
calculating the ratio parameter
The specific calculation formula is as follows: />
wherein ,
is a low heat load yield proportional parameter; />
Is a high heat load yield proportional parameter; />
Setting a lower limit value of yield control; />
Setting a yield control upper limit value; />
The current strip steel yield of the annealing furnace is obtained.
3. The annealing furnace heating control method according to claim 1 or 2, characterized by comprising an annealing furnace heating control device comprising:
the preprocessing module calculates the lower limit value of heating output
The specific calculation formula is as follows:
i is the serial number of the target burner group in the heating section;
setting output power limiting for the burner group; />
To adjust parameters; />
The total number of burner groups in the heating section is the total number of burner groups;
the method comprises the steps of preprocessing heating output power of a heating section to obtain target output power of the heating section;
the first control module is used for closing all burners in the target burner group when the target output power is not greater than the heating output lower limit value of the target burner group; wherein the target burner group is any burner group in the heating section;
the second control module is used for starting all burners in the target burner group when the target output power is not smaller than the heating output upper limit value of the target burner group;
the third control module is used for controlling the opening and closing of the burners in the target burner group according to the target output power when the target output power is larger than the heating output lower limit value and the target output power is smaller than the heating output upper limit value;
the third control module includes:
calculating the current output power of the target burner group
The specific calculation formula is as follows:
wherein ,
outputting power for the target; />
A lower limit value for the heating output; />
An upper limit value for the heating output;
according to the current output power
And controlling the opening and closing of the burners in the target burner group. />
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