CN101811143A - Temperature control method for heat-preservation casting blank to be rolled - Google Patents
Temperature control method for heat-preservation casting blank to be rolled Download PDFInfo
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- CN101811143A CN101811143A CN 201010154134 CN201010154134A CN101811143A CN 101811143 A CN101811143 A CN 101811143A CN 201010154134 CN201010154134 CN 201010154134 CN 201010154134 A CN201010154134 A CN 201010154134A CN 101811143 A CN101811143 A CN 101811143A
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Abstract
The invention provides a temperature control method for a heat-preservation casting blank to be rolled. The method has the following steps: (1) establishing rolling program information; (2) obtaining temperature correction value Tn of the heat-preservation casting blank to be rolled corresponding to the heat preservation time of the casting blank to be rolled; (3) establishing a heating mathematical model for computing the current temperature theta AV of the heat-preservation casting blank to be rolled; (4) correcting the current temperature theta AV of the heat-preservation casting blank to be rolled so as to computing the correction temperature T of the heat-preservation casting blank to be rolled; and (5) correcting and controlling the temperature of the heat-preservation casting blank to be rolled by means of the correction temperature. The temperature control method is capable of lowering heat loss, effectively avoiding rolling fluctuation caused by temperature fluctuation, guaranteeing temperature control accuracy and temperature stability of the heat-preservation casting blank to be rolled during rolling, and obviously saving heat energy.
Description
Technical field
The present invention relates to the steel rolling temperature control technology, relate in particular to a kind of accurate control method of heating-up temperature of the different steel grades insulation continuous casting billet to be rolled that carries out the temperature correction with Mathematical Modeling.
Background technology
From the continuous casting strand to rolling process, need be heated to needed rolling temperature to strand, according to the different steel grades of different casting blank, also need to formulate different heating and rolling mill practice.The heating process of formulating according to rolling mill practice is included in the shortest heat time heating time of strand in heating furnace under the minimum rolling demand, thereby guarantees that rolling temperature satisfies rolling requirement, and the operation of rolling is carried out smoothly.
Under the ordinary production situation, when strand mean temperature by calculated with mathematical model in the shortest heat time heating time reaches when coming out of the stove target temperature, think that promptly reaching rolling demand just can come out of the stove and be rolled.But in actual production, because the influence of many unfavorable factors such as rolling line fault, electric fault can not be carried out Rolling Production smoothly.Strand reaches it in the shortest heat time heating time when coming out of the stove target temperature, can only carry out insulation to be rolled in stove.This is to be rolled in order to guarantee to come out of the stove at any time at this target temperature value.Insulation to be rolled has prolonged the heat time heating time of strand in stove, and strand is fully absorbed heat, and the strand that makes insulation to be rolled is more much higher than be issued to can the come out of the stove thermal content of the not heat-preservation casting blank to be rolled that is rolled of the target temperature of coming out of the stove in the ordinary production situation.Therefore, under the situation that heat loss is roughly suitable in, the strand operation of rolling constant in rolling line technology, heat-preservation casting blank to be rolled in the operation of rolling its temperature apparently higher than heat-preservation casting blank not to be rolled.So cause the normal rolling temperature of temperature departure of strand, make operation of rolling temperature fluctuation big, operation of rolling instability, the quality problems of rolled products or the performance of product are undesirable.
At present, for the rolling mill practice that guarantees heat-preservation casting blank to be rolled is stablized, what prior art adopted is that operating personnel manually intervene the adjustment mill roll-gap and draught pressure is realized the rolling of heat-preservation casting blank to be rolled, this can occur intervening excessive inevitably or adjust not in place, thereby fundamentally do not solve the rolling temperature problem of heat-preservation casting blank to be rolled.
Summary of the invention
Purpose of the present invention is exactly the normal rolling temperature of temperature departure at heat-preservation casting blank to be rolled in the above-mentioned prior art, capability and performance problem of unstable because of the unstable influence of rolled product that brings of the operation of rolling, thereby provide a kind of temperature with calculated with mathematical model and correction heat-preservation casting blank to be rolled, and the method for the automatic control of utilization, make the temperature of strand to be rolled satisfy working condition identical with the normal heating strand under different rolling mill practices, guarantee the carrying out of Rolling Production continous-stable.
The invention provides a kind of temperature control method for heat-preservation casting blank to be rolled, described method specifically comprises the steps:
(1) formulates rolling scaduled information, described rolling scaduled information comprises steel grade, the thickness of strand, the shortest heating duration of strand, the strand of strand target temperature, strand temperature and the temperature of heat-preservation casting blank to be rolled when arriving the finish rolling inlet when arriving the finish rolling inlet when not carrying out insulation to be rolled of coming out of the stove, wherein, the strand target temperature of coming out of the stove is meant when strand goes out heating furnace, because of the rolling needed temperature of next procedure;
(2) obtain the temperature correction value Tn of heat-preservation casting blank to be rolled, wherein, temperature correction value Tn obtains the employing following steps: 1. different steel grade strands 0～10 minute after surpassing the shortest heating duration, 10～20 minutes, 20～30 minutes, 30～40 minutes, 40～50 minutes, 50～60 minutes, 60 minutes or above carry out insulation to be rolled after, the temperature T j when detecting strand and arriving rolling inlet; 2. different steel grade strands detect the temperature T y when strand arrival is rolling to enter the mouth when not carrying out insulation to be rolled; 3. the temperature correction value Tn=Tj-Ty of heat-preservation casting blank to be rolled.
(3) set up the heating Mathematical Modeling, with the Current Temperatures θ of heat-preservation casting blank to be rolled in the heating calculated with mathematical model heating furnace
AV, described heating Mathematical Modeling is:
θ
AV＝(θ
1+θ
2+θ
3+...+θ
i)/i，
Wherein,
Wherein, q
SUF=ε σ { (θ
AIR+ 273)
4-(θ
SUF+ 273)
4}-2.8 (θ
SUF-θ
AIR)
2,
Wherein, θ
AVCurrent Temperatures for heat-preservation casting blank to be rolled; θ
iBe each layer temperature of strand inside, its subscript i refers to the strand center as the origin of coordinates, and thickness direction is the hierarchy number that the X-axis coordinate carries out strand; q
SUFBe heat flow density, promptly furnace gas and casting billet surface carry out the intensity of heat exchange; λ is the pyroconductivity of strand, i.e. thermal technology's constant value of each steel grade; H is the thickness of heat-preservation casting blank to be rolled; X
iFor heat-preservation casting blank to be rolled center as the origin of coordinates, thickness direction is the thickness coordinate of X-axis; θ
SUFSurface temperature value for the actual measurement of shove charge end; ε is the combined radiation constant; σ is the Stefan-Bollzmann constant, i.e. this special fence-Boltzmann constant; θ
AIRFurnace gas temperature when just having packed heating furnace into when strand is got the atmospheric temperature of actual measurement at that time; With the q that calculates
SUFValue substitution θ
iAnd calculate θ
iValue, and then with θ
iSubstitution θ
AVIn the formula, calculate the Current Temperatures θ of heat-preservation casting blank to be rolled
AV
(4) with the Current Temperatures θ of rolling scaduled information, temperature correction value Tn and heat-preservation casting blank to be rolled
AV, according to saving as steel grade and chronological classification temperature correction data file, wherein, described temperature correction data file refers to the file that a kind of computer of suffix by name " .dat " can quick identification and read;
(5) utilize information in the temperature correction data file to the Current Temperatures θ of heat-preservation casting blank to be rolled
AVRevise, to calculate the correction temperature T of heat-preservation casting blank to be rolled, wherein, the Current Temperatures θ of the correction temperature T=heat-preservation casting blank to be rolled of heat-preservation casting blank to be rolled
AVThe temperature correction value Tn of+heat-preservation casting blank to be rolled;
(6) with revising temperature T the temperature of heat-preservation casting blank to be rolled is revised and controlled.
Correction temperature T with current heat-preservation casting blank to be rolled of the present invention is revised the heating-up temperature of current heat-preservation casting blank to be rolled, so that the tapping temperature of strand satisfies rolling requirement.
The present invention adopts the modelling mode to calculate heat-preservation casting blank accounting temperature to be rolled, and the strand accounting temperature is revised by the temperature correction value, can reduce relatively under the tapping temperature condition of heat-preservation casting blank to be rolled, make the strand under heat-preservation casting blank to be rolled and the ordinary production state that roughly the same thermal content be arranged, thereby in the equal operating mode operation of rolling, heat loss is reduced, the rolling fluctuation of effectively avoiding temperature fluctuation to bring, guarantee the temperature control precision of heat-preservation casting blank to be rolled and the temperature stability of the operation of rolling, produced significant saving heat energy effect.
The specific embodiment
Below specific embodiments of the invention further are described, therefore do not limit the present invention in the scope of described embodiment.
Mentality of designing of the present invention is that in the rolling mill practice process, the temperature drop of strand can meet the desired temperature conditions of rolling mill practice when temperature that strand comes out and arrival milling train at strand from heating furnace.In most of ordinary production, strand also can satisfy this condition when arriving milling train.But in actual production, through regular meeting because the influence of rolling circuit or electric many unfavorable factors such as break down makes Rolling Production not carry out smoothly.Here, strand has reached the target temperature that it is come out of the stove in the shortest heat time heating time, but can only carry out insulation to be rolled in stove, and pending fault is come out of the stove after eliminating again.But this moment, long the heat time heating time in stove because of strand, temperature is than the height of setting.If be rolled this moment, rolled products will make the quality and the unstable properties of rolled products because of being subjected to the influence of temperature fluctuation.Simultaneously, because heat time heating time is long, electricity and thermal losses increase, and the heating cost of strand rises.Therefore, the present invention has designed the Current Temperatures that calculates heating furnace with Mathematical Modeling, when it is not inconsistent with the arrival rolling temperature, promptly carry out the temperature correction automatically, the temperature control precision of heat-preservation casting blank to be rolled and the temperature stability of the operation of rolling have been guaranteed, thermal losses is reduced, thereby saved production cost.
Method of the present invention is finished according to following steps:
(1) makes rolling scaduled information;
Described rolling scaduled information comprises steel grade, the thickness of strand, the shortest heating duration of strand, the strand of strand target temperature, strand temperature and the temperature of heat-preservation casting blank to be rolled when arriving the finish rolling inlet when arriving the finish rolling inlet when not carrying out insulation to be rolled of coming out of the stove;
(2) obtain the temperature correction value Tn of heat-preservation casting blank to be rolled, wherein, temperature correction value Tn obtains the employing following steps: 1. different steel grade strands 0～10 minute after surpassing the shortest heating duration, 10～20 minutes, 20～30 minutes, 30～40 minutes, 40～50 minutes, 50～60 minutes, 60 minutes or above carry out insulation to be rolled after, the temperature T j when detecting strand and arriving rolling inlet; 2. different steel grade strands detect the temperature T y when strand arrival is rolling to enter the mouth when not carrying out insulation to be rolled; 3. the temperature correction value Tn=Tj-Ty of heat-preservation casting blank to be rolled;
(3) set up the heating Mathematical Modeling, with the Current Temperatures of heating calculated with mathematical model heat-preservation casting blank to be rolled;
θ
AV＝(θ
1+θ
2+θ
3+...+θ
i)/i，
Wherein, θ
AVBe the mean value of each layer of heat-preservation casting blank temperature to be rolled, the i.e. Current Temperatures of strand calculated with mathematical model; θ
1Be the ground floor temperature of strand, i.e. θ
SUF=θ 1, can obtain by actual measurement; θ
i(θ
2, θ
3...) be the internal temperature of strand, subscript i refers to the strand center as the origin of coordinates, and thickness direction is the hierarchy number that the X-axis coordinate carries out strand; According to the i value, strand is divided into the i layer along thickness direction, and calculates the temperature of each layer, the i value is big more, and it is high more to the computational accuracy of strand mean temperature then to heat Mathematical Modeling;
Every layer of temperature calculated with following computing formula:
q
SUF＝εσ{(θ
AIR+273)
4-(θ
SUF+273)
4}-2.8·(θ
SUF-θ
AIR)
1.25，
Wherein, q
SUFBe heat flow density, promptly furnace gas and casting billet surface carry out the intensity of heat exchange, also are referred to as heat stream abroad; ε is the combined radiation constant, and its value generally is controlled at 0.6～1.0; σ is the Stefan-Bollzmann constant, i.e. this special fence-Boltzmann constant; θ
AIRFurnace gas temperature when just having packed heating furnace into when strand is got the atmospheric temperature of actual measurement at that time, when second computing cycle from calculated with mathematical model, gets the actual measurement furnace gas temperature of strand present position; θ
SUFThe surface temperature of strand during for shove charge just, i.e. the surface temperature value of shove charge end actual measurement;
Calculate the heat flow density q of different steel grades with above-mentioned formula with strand
SUF
λ is the pyroconductivity of strand, and it is meant thermal technology's constant value of each steel grade of defined in thermal technology's handbook;
H is the thickness of heat-preservation casting blank to be rolled;
X
iFor heat-preservation casting blank to be rolled center as the origin of coordinates, thickness direction is the thickness coordinate of X-axis;
To calculate q
SUFValue substitution θ
iAnd calculate θ
iValue, and then with θ
iSubstitution θ
AVIn the formula, calculate the Current Temperatures of heat-preservation casting blank to be rolled.
(4) with the Current Temperatures θ of rolling scaduled information, temperature correction value Tn and heat-preservation casting blank to be rolled
AV, according to saving as steel grade and chronological classification temperature correction data file, wherein, described temperature correction data file refers to the file that a kind of computer of suffix by name " .dat " can quick identification and read;
(5) utilize information in the temperature correction data file to the Current Temperatures θ of heat-preservation casting blank to be rolled
AVRevise, to calculate the correction temperature T of heat-preservation casting blank to be rolled;
The current strand of temperature retention time Δ t=to be rolled actual heat time heating time-the shortest heat time heating time;
From database, take out the heat-preservation casting blank temperature θ current to be rolled of calculated with mathematical model
AV=T
0,, from strand temperature correction data file table 1, obtain corresponding strand temperature correction value Tn according to temperature retention time Δ t to be rolled again according to the strand steel grade that writes down in the rolling scaduled information;
Calculating current correction strand temperature according to Tn is: T=T
0+ Tn;
(6) with revising temperature T the temperature of heat-preservation casting blank to be rolled is revised and controlled.
With the current strand correction temperature that calculates the temperature of heating furnace is controlled, made this temperature satisfy the temperature requirement of road rolling process down, guarantee the performance and the quality of rolled products, reduce thermal losses and production cost.
In addition, the shortest heating duration of strand of the present invention is to heat up and do not destroy under the condition of its internal organizational structure guaranteeing according to different steel grade strands, and strand is heated to the target temperature of coming out of the stove the shortest needed heat time heating time.It can be determined according to the initial temperature of different steel grades, shove charge and the requirement of rolling mill practice.Its principle is strand to be heated out to satisfy actual rolling demand in the minimum time.
The down needed strand of the road rolling process of the present invention target temperature of coming out of the stove can be set according to the pair rolling technological parameter of different steel grades.
The strand that the used ground floor temperature of upward periodic model calculating of the present invention is meant different steel grades is when just packing heating furnace into, in the end measured surface temperature value of temperature measurer of packing into.
The heating calculated with mathematical model cycle of the present invention is set at 30 seconds～and 180 seconds.The cycle setting-up time is short more, and then Mathematical Modeling calculation times in the unit interval is many more, and the peak load that its setting value will can bear according to using a computer is come fixed, and the computing cycle that the present invention uses is 180 seconds.
The designed Mathematical Modeling of the present invention is to the calculating of place, position heating-up temperature in heating furnace in certain temperature retention time of current strand to be rolled, when the strand current to be rolled of calculated with mathematical model was greater than or less than the target temperature of coming out of the stove in certain temperature retention time, system carried out the temperature correction to current strand to be rolled automatically.By the temperature correction; make the tapping temperature of current strand to be rolled basic identical with the tapping temperature of strand to be rolled not; the heat loss of the current strand operation of rolling to be rolled is reduced; make that simultaneously the temperature fluctuation of strand in the operation of rolling is little; guarantee that the stable of the operation of rolling carries out, thereby protected the quality and the performance of rolled products.
Describe the present invention now with reference to following examples.
Embodiment 1: the cold rolling steel of low-carbon (LC) deep-draw series are controlled with strand modelling holding temperature to be rolled
In this embodiment, the present invention adopts following steps that the cold rolling steel of low-carbon (LC) deep-draw series are given modelling holding temperature control to be rolled with strand.
(1) makes rolling scaduled information according to low-carbon (LC) deep-draw series cold-rolled steel material;
The rolling scaduled information of present embodiment is: the thickness of strand is 200mm, being heated to the target temperature of coming out of the stove the shortest needed heating duration is 125 minutes, the strand of present embodiment is when going out heating furnace, the needed strand of the rolling process target temperature of coming out of the stove in following road is 1180 ± 5 ℃, and this target temperature value can be according to the pair rolling processing parameter setting of this steel grade.
(2) obtain the temperature correction value Tn of heat-preservation casting blank to be rolled;
With this strand 0～10 minute after surpassing the shortest heating duration, 10～20 minutes, 20～30 minutes, 30～40 minutes, 40～50 minutes, 50～60 minutes, carry out insulation to be rolled more than 60 minutes after, the temperature T j when detecting strand and arriving the finish rolling inlet is respectively 960 ℃, 963 ℃, 965 ℃, 968 ℃, 969 ℃, 970 ℃, 971 ℃ (annotating: to finish rolling temperature drop is arranged through roughing from coming out of the stove).
The strand of this steel grade is not when carrying out insulation to be rolled, and the detected temperatures Ty when arriving the finish rolling inlet is 960 ℃.
The holding temperature correction value Tn=Tj-Ty to be rolled of this steel grade strand is shown in the table 1:
Table 1 low-carbon (LC) deep-draw series cold-rolled steel material insulation correction chart to be rolled
| Temperature retention time to be rolled (minute) | ＜10 | ??10～??20 | ??20～??30 | ??30～??40 | ??40～??50 | ??50～??60 | ＞60 |
| The temperature correction value (℃) | 0 | ??3 | ??5 | ??8 | ??9 | ??10 | 11 |
(3) set up the heating Mathematical Modeling, with the Current Temperatures of heating calculated with mathematical model heat-preservation casting blank to be rolled;
θ
AV＝(θ
1+θ
2+θ
3+...+θ
i)/i，
Wherein, θ
AVBe the mean value of each layer of heat-preservation casting blank temperature to be rolled, the i.e. Current Temperatures of strand calculated with mathematical model; θ
1Ground floor temperature for strand; θ
i(θ
2, θ
3...) be the internal temperature of strand, subscript i refers to the strand center as the origin of coordinates, and thickness direction is the hierarchy number that the X-axis coordinate carries out strand; According to the i value, strand is divided into the i layer along thickness direction, and calculates the temperature of each layer, the i value is big more, and it is high more to the computational accuracy of strand mean temperature then to heat Mathematical Modeling, and the hierarchy number i value of present embodiment is 5; Every layer temperature is calculated with following computing formula:
q
SUF＝εσ{(θ
AIR+273)
4-(θ
SUF+273)
4}-2.8·(θ
SUF-θ
AIR)
2，
Wherein, q
SUFBeing heat flow density, is the intensity that furnace gas and casting billet surface carry out heat exchange, is also referred to as heat stream abroad; ε is the combined radiation constant, and the value of described combined radiation constant generally is controlled at 0.6～1.0, gets 0.6 in the present embodiment; The combined radiation constant is when building heating furnace, and according to the constant value that the stove situation is measured, this value generally gets 0.6～1.0 along with using all the year round and overhauling of heating furnace can change to some extent, and this value can adjust according to the temperature conditions of back operation reflection simultaneously; σ is the Stefan-Bollzmann constant, i.e. this special fence-Boltzmann constant, and this constant can obtain from thermal technology's handbook, gets 4.88 * 10 in the present embodiment
-8Wm
-2K
-4
In addition, θ
AIRFurnace gas temperature when just having packed heating furnace into when strand is got the atmospheric temperature of actual measurement at that time, when second computing cycle from calculated with mathematical model, gets the actual measurement furnace gas temperature of strand present position.In the present embodiment, the furnace gas temperature of place, strand position thermocouple actual measurement is 1183 ℃.
θ
SUFThe surface temperature of strand during for shove charge just, i.e. the surface temperature value of shove charge end temperature measurer actual measurement; In the present embodiment, the surface temperature value of shove charge end actual measurement is 625 ℃, when strand carries out second during to the n computation of Period via the heating Mathematical Modeling, θ in stove
SUFThen getting peeks from database learns the ground floor temperature value of computation of Period on the model.The current steel grade strand ground floor temperature of this example calculated with mathematical model of last one-period is 1170 ℃.
Present embodiment is used the heat flow density q of strand with this steel grade that above-mentioned formula calculated
SUF=4163.8 (unit is W/m
2).
λ: be the pyroconductivity of strand, described strand pyroconductivity refers to thermal technology's constant value of each steel grade of defined in thermal technology's handbook; In the present embodiment, getting the λ value is 32.
H: be the thickness of heat-preservation casting blank to be rolled, the heat-preservation casting blank thickness to be rolled of present embodiment is 200mm.
X
i: for heat-preservation casting blank to be rolled center as the origin of coordinates, thickness direction is the thickness coordinate of X-axis, slab thickness of the present invention is 200mm, being divided into is 5 layers, that is: 100,50,0 ,-50 ,-100.
With the q that calculates
SUFValue substitution θ
iAnd calculate θ
iValue, and then with θ
iSubstitution θ
AVIn the formula, the Current Temperatures that calculates heat-preservation casting blank to be rolled is 1170 ℃.
(4) with the Current Temperatures θ of rolling scaduled information, temperature correction value Tn and heat-preservation casting blank to be rolled
AV, according to saving as steel grade and chronological classification temperature correction data file, wherein, described temperature correction data file refers to the file that a kind of computer of suffix by name " .dat " can quick identification and read; Such as, list the rolling scaduled information and the Current Temperatures of heat-preservation casting blank to be rolled in table 2.
The cold rolling steel of the table 2 low-carbon (LC) deep-draw series rolling scaduled information of strand
| The target temperature of coming out of the stove | The strand Current Temperatures | The shortest heat time heating time | Furnace gas temperature | Slab thickness | Shove charge constantly |
| ??1180℃ | ??1170℃ | 125 minutes | ??1183℃ | ??200mm | ??2009-10-16??6:13:27 |
(5) utilize information in the temperature correction data file to the Current Temperatures θ of heat-preservation casting blank to be rolled
AVRevise, to calculate the correction temperature T of heat-preservation casting blank to be rolled;
The temperature correction value obtains: at first obtain the current strand of insulation duration Δ t=to be rolled actual heat time heating time-the shortest heat time heating time, according to Δ t get with temperature correction data file in table 1 in the pairing temperature value Tn of temperature retention time to be rolled.
From database, take out the heat-preservation casting blank temperature θ current to be rolled of calculated with mathematical model
AV=T0=1170 ℃.Current calculating is 2009-10-168:30:45 constantly, then current strand reality heats duration and is approximately 137 minutes in stove, this duration is greater than according to 125 minutes the shortest heating duration of the current strand that is write down in the rolling scaduled information, guarantor's duration Δ to be rolled like this t=137-125=12 minute, according to the strand steel grade that writes down in the rolling scaduled information, from strand temperature correction data file table 1, obtain Tn=3 ℃ of corresponding strand temperature correction value.
Calculating current correction strand temperature according to Tn is: T=T0+Tn=1170 ℃+3 ℃=1173 ℃.
(6) with revising temperature T the temperature of heat-preservation casting blank to be rolled is revised and controlled.
With 1173 ℃ of current strand correction temperature temperature in the stove is controlled, this temperature has satisfied the temperature requirements of time road rolling process, for saving most temperature range, has avoided the temperature fluctuation that produces because of the temperature difference simultaneously, has guaranteed the performance and the quality of rolled products.Compared with prior art, once rollingly can save 30～80 cubic metres of gas using quantities.According to certain steel mill's statistics, use the present invention, can save coal gas 50 ten thousand steres in 1 year, produced considerable economic, also guaranteed rolling stable and final products performance simultaneously.
Embodiment 2: yield strength is the holding temperature control to be rolled of 510MPa hot-strip modelling
(1) makes rolling scaduled information according to yield strength for the 510MPa hot-strip;
The rolling scaduled information of present embodiment is: the thickness of strand is 200mm, being heated to the target temperature of coming out of the stove the shortest needed heating duration is 140 minutes, the strand of present embodiment is when going out heating furnace, the needed strand of the rolling process target temperature of coming out of the stove in following road is 1210 ± 5 ℃, and this target temperature value can be according to the pair rolling processing parameter setting of this steel grade.
(2) obtain the temperature correction value Tn of heat-preservation casting blank to be rolled;
With this strand 0～10 minute after surpassing the shortest heating duration, 10～20 minutes, 20～30 minutes, 30～40 minutes, 40～50 minutes, 50～60 minutes, carry out insulation to be rolled more than 60 minutes after, the temperature T j when detecting strand and arriving the finish rolling inlet is respectively 1002 ℃, 1006 ℃, 1009 ℃, 1010 ℃, 1013 ℃, 1015 ℃, 1016 ℃;
This steel grade strand is not when carrying out insulation to be rolled, and the detected temperatures Ty when arriving the finish rolling inlet is 1002 ℃;
The holding temperature correction value Tn=Tj-Ty to be rolled of this steel grade strand is shown in the table 3:
Table 3 yield strength is a 510MPa hot-strip insulation correction table to be rolled
| Temperature retention time to be rolled (minute) | ＜10 | ??10～??20 | ??20～??30 | ??30～??40 | ??40～??50 | ??50～??60 | ＞60 |
| The temperature correction (℃) | 0 | ??4 | ??7 | ??8 | ??11 | ??13 | 14 |
(3) set up the heating Mathematical Modeling, with the Current Temperatures of heating calculated with mathematical model heat-preservation casting blank to be rolled;
θ
AV＝(θ
1+θ
2+θ
3+...+θ
i)/i
Wherein, θ
AVBeing the mean value of each layer of heat-preservation casting blank temperature to be rolled, also is the Current Temperatures of strand calculated with mathematical model; θ
lGround floor temperature for strand; θ
i(θ
2, θ
3...) be the internal temperature of strand, its subscript i refers to the strand center as the origin of coordinates, thickness direction is the hierarchy number that the X-axis coordinate carries out strand, according to the i value, strand is divided into the i layer along thickness direction, and calculates the temperature of each layer, the i value is big more, it is high more to the computational accuracy of strand mean temperature then to heat Mathematical Modeling, and it is 5 that present embodiment is got hierarchy number i value, and every layer temperature is calculated with following computing formula:
q
SUF＝εσ{(θ
AIR+273)
4-(θ
SUF+273)
4}-2.8·(θ
SUF-θ
AIR)
2，
Wherein, q
SUFBeing heat flow density, is the intensity that furnace gas and casting billet surface carry out heat exchange, is also referred to as heat stream abroad; ε is the combined radiation constant, and the value of described combined radiation constant generally is controlled at 0.6～1.0, gets 0.6 in the present embodiment; The combined radiation constant is when building heating furnace, and according to the constant value that the stove situation is measured, this value generally gets 0.6～1.0 along with using all the year round and overhauling of heating furnace can change to some extent, and this value can adjust according to the temperature conditions of back operation reflection simultaneously; σ is the Stefan-Bollzmann constant, i.e. this special fence-Boltzmann constant, and this constant can obtain from thermal technology's handbook, gets 4.88 * 10 in the present embodiment
-8Wm
-2K
-4
In addition, θ
AIRFurnace gas temperature when just having packed heating furnace into when strand is got the atmospheric temperature of actual measurement at that time, when second computing cycle from calculated with mathematical model, gets the actual measurement furnace gas temperature of strand present position.In the present embodiment, the furnace gas temperature of place, strand position thermocouple actual measurement is 1193 ℃.
θ
SUFThe surface temperature of strand during for shove charge just, i.e. the surface temperature value of shove charge end temperature measurer actual measurement; In the present embodiment, the surface temperature value of shove charge end actual measurement is 700 ℃, when strand carries out second during to the n computation of Period via the heating Mathematical Modeling, θ in stove
SUFThen from database, peek and learn the ground floor temperature value of computation of Period on the model.The current steel grade strand ground floor temperature of this example calculated with mathematical model of last one-period is 1185 ℃.
Present embodiment is used the heat flow density q of strand with this steel grade that above-mentioned formula calculated
SUF=2748.7.
λ: be the pyroconductivity of strand, described strand pyroconductivity refers to thermal technology's constant value of each steel grade of defined in thermal technology's handbook; In the present embodiment, getting the λ value is 45.
H: be the thickness of heat-preservation casting blank to be rolled, the heat-preservation casting blank thickness to be rolled of present embodiment is 200mm.
X
i: for heat-preservation casting blank to be rolled center as the origin of coordinates, thickness direction is the thickness coordinate of X-axis, slab thickness of the present invention is 200mm, being divided into is 5 layers, that is: 100,50,0 ,-50 ,-100.
With the q that calculates
SUFValue substitution θ
iAnd calculate θ
iValue, and then with θ
iSubstitution θ
AVIn the formula, the current mean temperature that calculates heat-preservation casting blank to be rolled is 1185 ℃.
(4) with the Current Temperatures θ of rolling scaduled information, temperature correction value Tn and heat-preservation casting blank to be rolled
AV, according to saving as steel grade and chronological classification temperature correction data file, wherein, described temperature correction data file refers to the file that a kind of computer of suffix by name " .dat " can quick identification and read; Such as, list the rolling scaduled information and the Current Temperatures of heat-preservation casting blank to be rolled in table 4.It is as shown in table 4 to the control information of this steel grade one block casting base to obtain on rolling scaduled information and the model cycle from database.
Table 4 yield strength is a 510MPa hot-strip strand plan information
| The target temperature of coming out of the stove | The strand Current Temperatures | The shortest heat time heating time | Furnace gas temperature | Slab thickness | Shove charge constantly |
| ??1200℃ | ??1185℃ | 140 minutes | ??1200℃ | ??200mm | ??2009-10-19??14:21:00 |
(5) utilize information in the temperature correction data file to the Current Temperatures θ of heat-preservation casting blank to be rolled
AVRevise, to calculate the correction temperature T of heat-preservation casting blank to be rolled;
The temperature correction value obtains: at first obtain the current strand of insulation duration Δ t=to be rolled actual one the shortest heat time heating time of heat time heating time, according to Δ t get with temperature correction data file in table 1 in the pairing temperature value Tn of temperature retention time to be rolled.
From database, take out the heat-preservation casting blank temperature θ current to be rolled of calculated with mathematical model
AV=T0=1185 ℃.Current calculating is 2009-10-16 8:30:45 constantly, then current strand reality heated duration=2009-10-16 18:28:15-2009-10-16 6:13:27 ≈ 167 minutes in stove, this duration is greater than according to 140 minutes the shortest heating duration of the current strand that is write down in the rolling scaduled information, guarantor's duration Δ to be rolled like this t=167-140=27 minute, according to the strand steel grade that writes down in the rolling scaduled information, from strand temperature correction data file table 3, obtain Tn=7 ℃ of corresponding strand temperature correction value.
Calculating current correction strand temperature according to Tn is: T=T0+Tn=1185 ℃+7 ℃=1192 ℃.
(6) with revising temperature T the temperature of heat-preservation casting blank to be rolled is revised and controlled.
With 1192 ℃ of current strand correction temperature temperature in the stove is controlled, this temperature has satisfied the temperature requirements of time road rolling process, for saving most temperature range, has avoided the temperature fluctuation that produces because of the temperature difference simultaneously, has guaranteed the performance and the quality of rolled products.Compared with prior art, once rollingly can save 40～90 cubic metres of gas using quantities.According to certain steel mill's statistics, use the present invention, can save coal gas 60 ten thousand steres in 1 year, produced considerable economic, also guaranteed rolling stable and final products performance simultaneously.
In conjunction with the embodiments 1 and 2, the present invention shows in the use result of certain hot rolled plate factory: the application of the invention, the final products comprehensive qualified rate also was highly improved (seeing Table 5) when the gas unit consumption of certain hot rolled plate factory was reduced, more than 400 ten thousand yuan of create beneficial results.
Table 5 the present invention uses the resultant effect instruction card
Claims (9)
1. temperature control method for heat-preservation casting blank to be rolled is characterized in that may further comprise the steps:
(1) formulates rolling scaduled information;
(2) obtain the temperature correction value Tn corresponding of heat-preservation casting blank to be rolled with temperature retention time to be rolled;
(3) set up the heating Mathematical Modeling, with the Current Temperatures θ of heating calculated with mathematical model heat-preservation casting blank to be rolled
AV
(4) with the Current Temperatures θ of rolling scaduled information, temperature correction value Tn and heat-preservation casting blank to be rolled
AV, according to saving as steel grade and chronological classification temperature correction data file;
(5) utilize information in the temperature correction data file to the Current Temperatures θ of heat-preservation casting blank to be rolled
AVRevise, to calculate the correction temperature T of heat-preservation casting blank to be rolled;
(6) with revising temperature T the temperature of heat-preservation casting blank to be rolled is revised and controlled.
2. temperature control method for heat-preservation casting blank to be rolled according to claim 1, it is characterized in that described rolling scaduled information comprises steel grade, the thickness of strand, the shortest heating duration of strand, the strand of strand target temperature, strand temperature and the temperature of heat-preservation casting blank to be rolled when arriving the finish rolling inlet when arriving the finish rolling inlet when not carrying out insulation to be rolled of coming out of the stove.
3. temperature control method for heat-preservation casting blank to be rolled according to claim 1 is characterized in that, described temperature retention time to be rolled is the poor of actual insulation duration to be rolled of strand and the shortest heating duration.
4. temperature control method for heat-preservation casting blank to be rolled according to claim 1 is characterized in that, obtains described temperature correction value Tn by following steps:
1. strand after surpassing the shortest heating duration 0～10 minute, 10～20 minutes, 20～30 minutes, 30～40 minutes, 40～50 minutes, 50～60 minutes, 60 minutes or above carry out insulation to be rolled after, the temperature T j when detecting strand and arriving the finish rolling inlet;
2. strand is when carrying out insulation to be rolled, the temperature T y when detecting strand and arriving the finish rolling inlet;
3. the temperature correction value Tn=Tj-Ty of heat-preservation casting blank to be rolled.
5. temperature control method for heat-preservation casting blank to be rolled according to claim 1 is characterized in that, described heating Mathematical Modeling is:
θ
AV＝(θ
1+θ
2+θ
3+...+θ
i)/i，
Wherein,
Wherein, q
SUF=ε σ { (θ
AIR+ 273)
4-(θ
SUF+ 273)
4}-2.8 (θ
SUF-θ
AIR)
2,
Wherein, θ
AVCurrent Temperatures for heat-preservation casting blank to be rolled; θ
iBe each layer temperature of strand inside, its subscript i refers to the strand center as the origin of coordinates, and thickness direction is the hierarchy number that the X-axis coordinate carries out strand, according to the i value, strand is divided into the i layer along thickness direction, and calculates the temperature of each layer; q
SUFBe heat flow density; λ is the pyroconductivity of strand; H is the thickness of heat-preservation casting blank to be rolled; X
iFor heat-preservation casting blank to be rolled center as the origin of coordinates, thickness direction is the thickness coordinate of X-axis; θ
SUFSurface temperature value for the actual measurement of shove charge end; ε is the combined radiation constant; σ is this special fence-Boltzmann constant; θ
AIRFurnace gas temperature when just having packed heating furnace into when strand is got the atmospheric temperature of actual measurement at that time;
With the q that calculates
SUFValue substitution θ
iAnd calculate θ
iValue, and then with θ
iSubstitution θ
AVIn the formula, calculate the Current Temperatures θ of heat-preservation casting blank to be rolled
AV
6. temperature control method for heat-preservation casting blank to be rolled according to claim 1 is characterized in that, the Current Temperatures θ of the correction temperature T=heat-preservation casting blank to be rolled of heat-preservation casting blank to be rolled
AVThe temperature correction value Tn of+heat-preservation casting blank to be rolled.
7. temperature control method for heat-preservation casting blank to be rolled according to claim 2, it is characterized in that, the shortest heating duration of described strand is meant according to the strand intensification and guarantees not destroy its internal organizational structure and requires down, strand is heated to the target temperature of coming out of the stove, to satisfy the actual rolling the shortest needed heat time heating time that requires.
8. temperature control method for heat-preservation casting blank to be rolled according to claim 7 is characterized in that, the described target temperature of coming out of the stove is meant when strand goes out heating furnace, because of the rolling needed temperature of next procedure.
9. temperature control method for heat-preservation casting blank to be rolled according to claim 1 is characterized in that, described temperature correction data file refers to the file that a kind of computer of suffix by name " .dat " can quick identification and read.
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| CN101972780A (en) * | 2010-11-11 | 2011-02-16 | 攀钢集团钢铁钒钛股份有限公司 | Hot rolling titanium casting blank temperature control method |
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| CN106984653A (en) * | 2017-06-05 | 2017-07-28 | 杭州电子科技大学 | Warm-rolling machine subsection heating device |
| CN112461010A (en) * | 2020-10-12 | 2021-03-09 | 首钢京唐钢铁联合有限责任公司 | Method, device and medium for reducing energy consumption of heating furnace to be rolled |
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| CN103447314A (en) * | 2012-05-28 | 2013-12-18 | 宝山钢铁股份有限公司 | Rough rolling temperature-measuring feedback control method |
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| CN106984653A (en) * | 2017-06-05 | 2017-07-28 | 杭州电子科技大学 | Warm-rolling machine subsection heating device |
| CN112461010A (en) * | 2020-10-12 | 2021-03-09 | 首钢京唐钢铁联合有限责任公司 | Method, device and medium for reducing energy consumption of heating furnace to be rolled |
| CN112461010B (en) * | 2020-10-12 | 2022-06-14 | 首钢京唐钢铁联合有限责任公司 | Method, device and medium for reducing energy consumption of heating furnace to be rolled |
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