CN108467938A - A kind of annealing furnace bringing-up section radiant tube temperature setting method - Google Patents
A kind of annealing furnace bringing-up section radiant tube temperature setting method Download PDFInfo
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- CN108467938A CN108467938A CN201810628811.4A CN201810628811A CN108467938A CN 108467938 A CN108467938 A CN 108467938A CN 201810628811 A CN201810628811 A CN 201810628811A CN 108467938 A CN108467938 A CN 108467938A
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- radiant tube
- width
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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
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- 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 invention discloses a kind of annealing furnace bringing-up section radiant tube temperature setting method, this method comprises the following steps：S1：Establish the setting rule of bringing-up section radiant tube temperature under the different steel grade limit；S2：Period acquires the steel grade thickness of practical strip, width and velocity group, and the reference array of corresponding steel grade is chosen from database；S3：The corresponding each row radiant tube temperature in thickness extreme value of the strip in reference array is chosen, width, velocity limits array are gone out by mathematic interpolation；S4：The width extreme value in the strip width, velocity limits array is chosen, velocity limits array is gone out by mathematic interpolation；S5：The velocity limits in the strip speed extreme value array are chosen, calculate the array of corresponding speed, and using the array as the temperature initial value of radiant tube；S6：Initial value is assigned to level-one as setting value, bringing-up section is controlled.The present invention determines that initial temperature is distributed by mathematic interpolation, and the online production for being suitable for annealing furnace calculates and control.
Description
Technical field
The invention belongs to annealing furnace control technology fields, are related to a kind of annealing furnace bringing-up section radiant tube temperature setting method.
Background technology
Currently, to possess annealing furnace more for the country, but China's annealing furnace controlled level, compared with foreign countries, there are certain differences
Away from the controlled level of total system and single devices all needs to be further improved.Wherein how to be set about bringing-up section radiant tube
Fixed obscure always is introduced, and is generally recepted the caloric using Thermodynamic calculation strip to calculate radiant tube temperature, but about radiant tube point
The result of cloth can have ten million kind of form, not sought unity of standard using which kind of method.
The radiant tube heating with regard to annealing furnace domestic at present proposes some patent applications, but a portion is to be directed to one
Grade control illustrates, such as the patents such as CN201020204449.7, CN201020528237.4, they mainly realize equipment with
Furnace temperature, the direct feedback control of band temperature.Also a few patents are whole annealing furnace control, including mathematical model, such as
201110333416.1 waiting.In addition, some patent is the control method of radiant tube temperature, spoke is adjusted by belt steel temperature
It penetrates tube temperature degree and radiant tube temperature etc., such as 201510455927.9 is either calculated according to heat treatment cycle curve,
201510846168.9 waiting.The above patent does not account for strip width, the influence to radiant tube temperature such as thickness.
Invention content
In view of this, the purpose of the present invention is to provide a kind of annealing furnace bringing-up section radiant tube temperature setting method, pass through
The maximum and minimum setting value under Limit specifications is established,
In order to achieve the above objectives, the present invention provides the following technical solutions：
A kind of annealing furnace bringing-up section radiant tube temperature setting method, this method comprise the following steps：
S1：According to the dimension limit of different steel grades, it is each to establish annealing furnace bringing-up section under different each dimensions limit of steel grade
The setting rule of row radiant tube temperature；
S2：Period acquires the steel grade thickness of practical strip, width and velocity group, and is chosen from database according to steel grade pair
Answer the reference array of steel grade；
S3：It chooses the corresponding each row in maximum thickness and thickness minimum value of the strip in reference array and radiates tube temperature
Degree, as the most value of mathematic interpolation, according to the actual (real) thickness of strip, goes out corresponding width, speed under the thickness by mathematic interpolation
Spend extreme value array；
S4：On the basis of S3, the width maximum value and width minimum in the strip width, velocity limits array are chosen
Value, as the most value of mathematic interpolation, according to the developed width of strip, goes out corresponding velocity limits under the width by mathematic interpolation
Array；
S5：On the basis of S4, the speed maximum value and speed minimum value in the strip speed extreme value array are chosen, as
The most value of mathematic interpolation calculates the array of corresponding speed according to the actual speed of steel grade, and using the array as radiant tube
Temperature initial value；
S6：The online ratio that initial value is assigned to level-one as setting value, and passes through the value of feedback setting value of belt steel temperature
Example is adjusted, and realization controls bringing-up section.
Further, step S1 is specially：
S11：Establish the setting rule of the radiant tube temperature under thickness limit：
When thickness is most thin, radiant tube is according at the uniform velocity heating mode, and when belt steel thickness is most thick, radiant tube is arranged according to preceding a
It is rapidly heated, the pattern of rear b row heat preservation, wherein a1, b1 are integer, and a1+b1=n, n are the total columns of radiant tube；
S12：Establish the setting rule of the radiant tube temperature under limit velocity：
In speed minimum, radiant tube does not heat up according to preceding a2 row, the pattern of rear b2 row heating, in speed maximum, spoke
It penetrates pipe to be rapidly heated according to preceding a2 row, the pattern of rear a2 row heat preservation, wherein a2, b2 is integer, and a2+b2=n, n are radiant tube
Total columns；
S13：Establish the setting rule of the radiant tube temperature under Limit Width：
When width is most narrow, radiant tube is according to gradual heating mode, and when width is most wide, radiant tube is gradually passed according to temperature
Size reduction mode.
Further, the formula of the mathematic interpolation is：
Wherein, Y indicates the radiant tube temperature calculations under corresponding strip actual parameter, Amax、AminIndicate selected number
Maximum, the minimum value of dimension, b are corresponded to according to strip in groupmax、bminIndicate that strip corresponds to maximum, minimum value in dimension, X is indicated
The strip dimensional parameter actually calculated.
Further, in step S12, speed minimum value is set as 30m/min.
Further, in step S2, the reference array according to thickness maximin, width maximin, speed most
Big minimum value intersects setting, and thickness, width, the calculated specific gravity of speed three are identical.
Further, in step S2, the quantity of reference array is 8, and every group of reference array corresponds to the temperature of n row radiant tubes
Value.
The beneficial effects of the present invention are：
The present invention is based on heat-transfer mechanism analyses, it is first determined then the radiant tube setting value rule under Limit specifications passes through
To thickness, width, speed etc. than mathematic interpolation, initial value distribution situation is determined, then according to the detected value of practical strip
Carry out online proportion adjustment radiant tube temperature with desired value, for producing control, the online production for being suitable for annealing furnace calculate and
Control.
Description of the drawings
In order to keep the purpose of the present invention, technical solution and advantageous effect clearer, the present invention provides following attached drawing and carries out
Explanation：
Fig. 1 is initial value setting process figure of the present invention；
Fig. 2 is annealing furnace bringing-up section master control flow chart；
Fig. 3 is the regular schematic diagram of radiant tube temperature setting under thickness limit of the present invention；
Fig. 4 is the regular schematic diagram of radiant tube temperature setting under limit velocity of the present invention；
Fig. 5 is the regular schematic diagram of radiant tube temperature setting under Limit Width of the present invention.
Specific implementation mode
Below in conjunction with attached drawing, the preferred embodiment of the present invention is described in detail.
Continuous annealing furnace is generally made of preheating section, bringing-up section, soaking zone, cooling section, (overaging), equalizer section.Preheating
Section and rapid cooling section are all to carry out heating and cooling treatment to strip by circulating fan, and bringing-up section and soaking zone are then to pass through radiation
The power of pipe carries out computer heating control, and using bringing-up section as research object, other sections are timely because feeding back, and adjust and are easy, therefore the present invention
It does not describe.As shown in Figure 1, the method for the present invention includes the following steps：
Step 1：Establish adding under two kinds of limiting cases of minimax in thickness, width, speed under different steel grades
Each row radiant tube of hot arc sets Distribution Value.Such as：CQ [2,2,2, m], DQ [2,2,2, m], DDQ [2,2,2, m], EDDQ [2,2,2,
M] etc., wherein array is 4 dimension groups, respectively represents thickness, width, speed, radiant tube columns.
1) the setting rule under thickness limit：
Thickness minimax value is actual product design specification, and when thickness is most thin, strip is according to the mould at the uniform velocity to heat up
Formula, when strip is most thick, the pattern of strip several row heat preservations after being rapidly heated according to former row, radiant tube Temperature Distribution such as Fig. 3 institutes
Show.
2) the setting rule under limit velocity：
Speed minimum value is set as 30m/min, and maximum value is actual production maximum value, and under speed minimum value, strip is pressed
The pattern of several row heatings after not heating up according to former row, under speed maximum value, several row are protected after strip is rapidly heated according to former row
The pattern of temperature, radiant tube Temperature Distribution are as shown in Figure 4.
3) the setting rule under Limit Width：
Width minimax value is actual product design specification, and when width is most narrow, radiant tube is incremented by mould according to gradual
Formula, when strip is most wide, for radiant tube temperature according to the pattern successively decreased is set up, radiant tube Temperature Distribution is as shown in Figure 5.
Array intersects setting according to thickness maximin, width maximin, speed maximin, and it is total to be divided into 8
Situation, as：Thickness maximum width maximum speed is maximum, and thickness maximum width maximum speed is minimum, and thickness maximum width is minimum
Speed is maximum, and thickness maximum width minimum speed is minimum, and thickness minimum widith maximum speed is maximum, the maximum speed of thickness minimum widith
Degree is minimum, and thickness minimum widith minimum speed is maximum, and thickness minimum widith minimum speed is minimum；Each case, consideration thickness,
Width, the mode of three kinds of overlappings of speed and three's calculating ratio row are identical.
Step 2：According to the actual value of the thickness of acquisition, width, speed, each row spoke is calculated using the computational methods of difference
Penetrate the setting value of pipe.
Wherein, mathematic interpolation is calculated using following formula：
In formula：
Amax, Amin--- the maximin of dimension is corresponded in array；
bmax, bmin--- the most value of certain corresponding dimension, such as：Thickness, width, speed are known；
X --- the strip actual parameter involved in calculating, such as：Thickness, width, speed；
Y --- the radiant tube temperature calculations under corresponding strip actual parameter；
According to calculating difference in first calculated thickness, mathematic interpolation then is carried out according to width on same thickness, same
According to speed calculating difference, the initial value of as final radiant tube temperature on thickness, width.
Step 3：It is assigned according to initial set value, and online proportion adjustment is carried out by first order feed-back value, realize control in real time
System.
As shown in Fig. 2, in practical applications, the thickness of steel grade, width, speed, heat treatment grade etc. can be acquired with the period
Parameter, and judge whether the specification of steel grade changes, and then determine a need for recalculating initial set value, to realize
The continuous operation of whole system.
Specific calculation process example：
1) according to heat transfer principle, the corresponding thickness minimax of each steel grade, speed minimax, width maximum are calculated
Radiant tube setting rule in the case of minimum corresponding 8 kinds, rule curve as previously shown will be according to thickness, width, speed
Corresponding feature and requirement determine.
2) according to practical steel grade, the data of corresponding steel grade are chosen from database, here with CQ [x, y, z, m] for,
In, x representative thicknesses, y represents width, z representation speeds, and m represents the columns of radiant tube, 1≤m≤n.
3) according to the actual (real) thickness for calculating strip, choose corresponding array the corresponding 4 situation CQ of maximum thickness [1,
Y, z, m], the corresponding 4 situation CQ [0, y, z, m] of thickness minimum value are respectively as Amax, Amin, wherein 1 represents maximum value, 0 generation
Table minimum value.
4) it further, according to mathematic interpolation formula, brings relevant parameter into, calculates 4 kinds under corresponding thickness in width, speed
Limit array on degree is stored in CQ1 [y, z, m].
5) according to the developed width for calculating strip, the corresponding 2 situation CQ1 of width maximum value of corresponding array are chosen
[1, z, m], the corresponding 2 situation CQ1 [0, z, m] of width minimum are respectively as Amax, Amin, wherein 1 represents maximum value, 0 generation
Table minimum value.
6) it further, according to mathematic interpolation formula, brings relevant parameter into, calculates 2 kinds under corresponding width in speed
Limit array be stored in CQ2 [z, m].
7) according to the actual speed for calculating strip, choose situation CQ2 corresponding to the speed maximum value of corresponding array [1,
M], situation CQ2 [0, m] corresponding to speed minimum value is respectively as Amax, Amin, wherein 1 represents maximum value, 0 represents minimum value.
8) further, according to mathematic interpolation formula, relevant parameter is brought into, the array calculated under corresponding speed is stored in
In CQ3 [m], then the array is the initial value of radiant tube.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (6)
1. a kind of annealing furnace bringing-up section radiant tube temperature setting method, it is characterised in that：This method comprises the following steps：
S1：According to the dimension limit of different steel grades, each row spoke of annealing furnace bringing-up section under different each dimensions limit of steel grade is established
Penetrate the setting rule of tube temperature degree；
S2：Period acquires the steel grade thickness of practical strip, width and velocity group, and chooses corresponding steel from database according to steel grade
The reference array of kind；
S3：The corresponding each row radiant tube temperature in maximum thickness and thickness minimum value of the strip in reference array is chosen, is made
Corresponding width, velocity limits under the thickness are gone out by mathematic interpolation according to the actual (real) thickness of strip for the most value of mathematic interpolation
Array；
S4：On the basis of S3, the width maximum value and width minimum in the strip width, velocity limits array are chosen, is made
Corresponding velocity limits array under the width is gone out by mathematic interpolation according to the developed width of strip for the most value of mathematic interpolation；
S5：On the basis of S4, the speed maximum value and speed minimum value in the strip speed extreme value array are chosen, as difference
The most value calculated, the array of corresponding speed is calculated according to the actual speed of steel grade, and using the array as the temperature of radiant tube
Initial value；
S6：The online ratio tune that initial value is assigned to level-one as setting value, and passes through the value of feedback setting value of belt steel temperature
Section, realization control bringing-up section.
2. a kind of annealing furnace bringing-up section radiant tube temperature setting method according to claim 1, it is characterised in that：Step S1
Specially：
S11：Establish the setting rule of the radiant tube temperature under thickness limit：
When thickness is most thin, radiant tube is according at the uniform velocity heating mode, and when belt steel thickness is most thick, radiant tube arranges quick according to preceding a
Heating, the pattern of rear b row heat preservation, wherein a1, b1 are integer, and a1+b1=n, n are the total columns of radiant tube；
S12：Establish the setting rule of the radiant tube temperature under limit velocity：
In speed minimum, radiant tube does not heat up according to preceding a2 row, the pattern of rear b2 row heating, in speed maximum, radiant tube
It is rapidly heated according to preceding a2 row, the pattern of rear a2 row heat preservation, wherein a2, b2 are integer, and a2+b2=n, n are that radiant tube always arranges
Number；
S13：Establish the setting rule of the radiant tube temperature under Limit Width：
When width is most narrow, radiant tube is according to gradual heating mode, and when width is most wide, radiant tube gradually successively decreases mould according to temperature
Formula.
3. a kind of annealing furnace bringing-up section radiant tube temperature setting method according to claim 2, it is characterised in that：The difference
Value calculate formula be：
Wherein, Y indicates the radiant tube temperature calculations under corresponding strip actual parameter, Amax、AminIndicate selected data group
Middle strip corresponds to the maximum of dimension, minimum value, bmax、bminIndicate that strip corresponds to maximum, minimum value in dimension, X indicates practical
The strip dimensional parameter of calculating.
4. a kind of annealing furnace bringing-up section radiant tube temperature setting method according to claim 2, it is characterised in that：Step
In S12, speed minimum value is set as 30m/min.
5. a kind of annealing furnace bringing-up section radiant tube temperature setting method according to claim 2, it is characterised in that：Step S2
In, the reference array intersects setting according to thickness maximin, width maximin, speed maximin, and thick
Degree, width, the calculated specific gravity of speed three are identical.
6. a kind of annealing furnace bringing-up section radiant tube temperature setting method according to claim 5, it is characterised in that：Step S2
In, the quantity of reference array is 8, and every group of reference array corresponds to the temperature value of n row radiant tubes.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110408771A (en) * | 2019-07-18 | 2019-11-05 | 首钢京唐钢铁联合有限责任公司 | A kind of annealing furnace band temperature process transition control method and device |
| CN115232955A (en) * | 2022-07-22 | 2022-10-25 | 安徽工业大学 | Optimized control method for strip steel temperature in dynamic heating process of continuous annealing furnace |
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| CN115232955B (en) * | 2022-07-22 | 2023-07-18 | 安徽工业大学 | Optimization control method for strip steel temperature in dynamic heating process of continuous annealing furnace |
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