CN110231840A - The control method of the black print temperature difference of steel billet water beam in a kind of walking beam heating furnace furnace - Google Patents
The control method of the black print temperature difference of steel billet water beam in a kind of walking beam heating furnace furnace Download PDFInfo
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- CN110231840A CN110231840A CN201910489903.3A CN201910489903A CN110231840A CN 110231840 A CN110231840 A CN 110231840A CN 201910489903 A CN201910489903 A CN 201910489903A CN 110231840 A CN110231840 A CN 110231840A
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- steel billet
- water beam
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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
- C21D9/70—Furnaces for ingots, i.e. soaking pits
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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- Chemical & Material Sciences (AREA)
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- Crystallography & Structural Chemistry (AREA)
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- Metallurgy (AREA)
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- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Control Of Heat Treatment Processes (AREA)
Abstract
The present invention relates to a kind of control methods of the black print temperature difference of steel billet water beam in walking beam heating furnace furnace, belong to heating furnace Optimized-control Technique field.This method determines the comprehensive thermal coefficient deviation due to caused by bridging effect of the black print part of water beam with the black print part of non-aqueous beam by the data regression that even buried is tested；Temperature by establishing the black print part of water beam tracks computation model, calculates the temperature difference of the black print part of steel billet water beam in heating process in the stove；It is controlled and is required according to the different black print part temperature difference, carried out suitable steel billet time inside furnace adjustment, form the black print temperature difference control method of perfect steel billet water beam.This method can be realized the black print temperature difference of steel billet water beam of coming out of the stove and meet computer heating control demand, which has stronger operability, have biggish promotional value.
Description
Technical field
The invention belongs to metallurgical technology fields, especially heating furnace Optimized-control Technique field, are related to a kind of stepping beam type
The control method of the black print temperature difference of steel billet water beam in heating-furnace.
Background technique
Heating furnace is the important equipment of Rolling production, and the quality of heating steel billet directly restricts final product quality.Walking beam
The use of formula heating furnace enables steel billet in furnace to heat simultaneously from upper and lower part, and the temperature for substantially increasing steel billet totality is equal
Even property, but also bring steel billet and lead to the problem of the black print of water beam with water beam contact portion.When the black print temperature difference of water beam be more than 35 DEG C with
On, it is possible to the rolling quality of subsequent technique is influenced, therefore, when coming out of the stove to steel billet, the black print temperature difference of steel billet water beam has more
Stringent restriction.The direct measurement means of the black print temperature difference of water beam are heated in furnace due to lacking at present, to depend on and establish water beam
The method of black print temperature model calculates the black print temperature difference of water beam, to meet the requirement of control of industrial furnace home.
It is domestic in the patent application for reducing the black India side face of steel billet water beam at present, mainly in the structure and material to water beam pad block
Improvement in terms of matter, such as Chinese patent CN201420274219.6, CN201310726634.0 etc..And it is directed to Heating Furnace Control
In terms of the patent of aspect is all not directed to the black print control of water beam, such as CN200910053532.0, CN201110076910.4 special
Benefit etc..Therefore, in order to ensure the quality for heating steel billet, it is badly in need of at present a kind of black for steel billet water beam in walking beam heating furnace furnace
Print the control method of the temperature difference.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of black print temperature difference of steel billet water beam in walking beam heating furnace furnace
Control method, this method determine the black print part of water beam with the black print part of non-aqueous beam due to hiding by the data regression that even buried is tested
Comprehensive thermal coefficient deviation caused by the effect of covering；The temperature tracking computation model for establishing the black print part of water beam, calculates steel billet and exists
The temperature difference of the black print part of water beam in heating process in the stove；It is controlled and is required according to the different black print part temperature difference, carry out suitable steel
The black print temperature difference control of perfect steel billet water beam is realized in the adjustment of base time inside furnace.
In order to achieve the above objectives, the invention provides the following technical scheme:
The control method of the black print temperature difference of steel billet water beam in a kind of walking beam heating furnace furnace, method includes the following steps:
S1: according to the combined radiation system of steel billet black box measured data inverse steel billet bottom water beam portion point and non-aqueous beam portion point
Number；
S2: according to the water beam portion position of the step S1 calculating combined radiation coefficient different from non-aqueous beam portion position, data are being carried out just
After true property judgement, the sheltering coefficient of water beam portion point is calculated；
S3: it chooses comprising intercepting inside steel billet two-dimensional section along wide direction centered on water beam shaded portions, divides two-dimensional mesh
Lattice establish two dimensional model, according to the difference on steel billet top, steel billet lower part water beam portion position and non-aqueous beam portion position, calculate respective heat
Current density establishes section temperature tracking, periodically calculates the temperature of each temperature spot on section；
S4: the black print temperature difference of the water beam portion calculated in real time point and technique are required water beam by the steel billet that will be come out of the stove for every piece
The black print control temperature difference compares, and to the steel billet for not being inconsistent the black print control temperature difference of Heshui beam, the mode for increasing heating time is taken
Meet technique requirement.
Further, in step sl, the measured data includes steel billet water beam portion position even buried depth value, the non-aqueous beam of steel billet
The steel billet position that the even buried depth value at position, cycle detection furnace temperature, the even buried point periodically acquired detect numerical value, periodically acquire
The periodic quantity and steel billet steel information of confidence breath, record data.
Further, in step sl, the combined radiation coefficient for calculating steel billet bottom water beam portion point and non-aqueous beam portion point,
Take following methods:
In steel billet bottom water beam portion point and non-aqueous beam portion point, one-dimensional Thick Plate Model is established respectively, then each black box acquisition
The combined radiation coefficient in data period is calculated with following equation:
In formula, k is Boltzmann constant, and ε is complex heat transfer coefficient, TfFor furnace temperature, TsFor steel billet temperature, λ is that steel billet is thermally conductive
Coefficient, Δ τ are time step, and Δ y is spatial mesh size, and ρ is steel billet density, CpFor steel billet specific heat；τ indicates timing node；TτAnd Tτ+1Respectively indicate the temperature at τ moment and τ+1 moment steel billet；S indicates nodes of locations；TsAnd Ts-1Respectively surface node and surface to
The temperature of one node layer of inside steel billet.
Further, in step s 2, the combined radiation coefficient different from non-aqueous beam portion position according to water beam portion position calculates
The sheltering coefficient of water beam portion point specifically uses following formula:
Kshade=σskid/σ
K in formulashadeFor sheltering coefficient, σskidFor the combined radiation coefficient value of water beam portion point, σ is the synthesis of non-aqueous beam portion point
Emissivity values.
Further, in step s3, it chooses comprising prolonging furnace wide direction interception inside steel billet two centered on water beam shaded portions
Section is tieed up, two-dimensional grid is divided, establishes two dimensional model, according to steel billet top, steel billet lower part water beam portion position and non-aqueous beam portion position
Difference inputs corresponding heat flow, and the two-dimentional steel billet temperature computation mould of the black print of water beam and its peripheral part is established according to following methods
Type:
Primary condition:
The T of τ=0 (x, y, 0)=To(x,y)
Boundary condition:
Each different position calculates separately the input of the heat flow density on the different position in each boundary of steel billet:
Hot-fluid including water beam portion point:
The hot-fluid in non-aqueous beam bottom portion:
Top hot-fluid:
Heat flow input in two sides is 0；
In formula, x is the length in section, that is, the length of the water beam and its adjacent part intercepted；Y is the height in section,
The namely height of steel billet；The τ time；T (x, y, τ) is the temperature for appointing point in steel billet unit；λ is steel billet thermal coefficient, and ρ is steel billet
Density, CPFor steel billet specific heat；CgwmCarry out radiation coefficient to lead；kshadeFor the position Shui Liang sheltering coefficient；kbtmFor the amendment of bottom hot-fluid
Coefficient；ktopFor top the amended parameters of thermal flow.
Further, in step s 4, heating furnace heating steel billet work is compared using the black print temperature difference of the water beam portion calculated in real time point
The black print of the water beam that skill requires controls the temperature difference, and the mode for increasing heating time is taken to meet heating total demand, specific as follows:
It is T that steel billet requires the black print temperature difference of most water beams of control in heating furnacer, choose and calculate two-dimension temperature section
In, the minimum temperature spot T of temperaturelowWith the highest point T of bottom temphigh, difference between the two is the black real-time temperature difference of print of water beam
Tskid=Thigh-Tlow；
Work as Tskid> TrWhen, it is judged as that the black print temperature difference of water beam is unsatisfactory for heating requirements, comes out of the stove the time in the control of overall steel billet
On the basis of increase by 3 minutes soaking times；Work as Tskid< TrOr Tskid=TrWhen, determine that the black print temperature difference of water beam meets heating requirements, has
Standby condition of coming out of the stove.
The beneficial effects of the present invention are: control steel billet water beam Hei Yinwen in walking beam heating furnace proposed by the present invention
The method of difference is conducive to the heating quality for improving steel billet；It cannot pass through in situation measured directly in the black print temperature difference of steel billet water beam
The real-time tracking that the foundation of laboratory data and steel billet two-dimensional section model realizes the print temperature difference black to steel billet water beam calculates, with this
Based on, it is controlled using reasonable time inside furnace, realizes that the black print temperature difference of steel billet water beam of coming out of the stove meets computer heating control demand.The control
Method has stronger operability, has biggish popularization face.
Other advantages, target and feature of the invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.Target of the invention and other advantages can be realized by following specification and
It obtains.
Detailed description of the invention
To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention is made below in conjunction with attached drawing excellent
The detailed description of choosing, in which:
Fig. 1 is the overall flow figure of the method provided by the present invention；
Fig. 2 is the steel billet two-dimensional section temperature computation flow chart on the top Shui Liang；
Fig. 3 is the black print control strategy flow chart of water beam.
Specific embodiment
Method provided by the invention is described in detail below by specific embodiment.
Fig. 1 is the overall flow figure of the method provided by the present invention, as shown, walking beam heating furnace furnace provided by the invention
The control method of the black print temperature difference of interior steel billet water beam the following steps are included:
S1: according to the combined radiation system of steel billet black box measured data inverse steel billet bottom water beam portion point and non-aqueous beam portion point
Number；
S2: according to the water beam portion position of the step S1 calculating combined radiation coefficient different from non-aqueous beam portion position, data are being carried out just
After true property judgement, the sheltering coefficient of water beam portion point is calculated；
S3: it chooses comprising intercepting inside steel billet two-dimensional section along wide direction centered on water beam shaded portions, divides two-dimensional mesh
Lattice establish two dimensional model, according to the difference on steel billet top, steel billet lower part water beam portion position and non-aqueous beam portion position, calculate respective heat
Current density establishes section temperature tracking, periodically calculates the temperature of each temperature spot on section；
S4: the black print temperature difference of the water beam portion calculated in real time point and technique are required water beam by the steel billet that will be come out of the stove for every piece
The black print control temperature difference compares, and to the steel billet for not being inconsistent the black print control temperature difference of Heshui beam, the mode for increasing heating time is taken
Meet technique requirement.
In this example, the heating furnace effective length of selection be 49.5m, burner hearth inner width 12.7m, altogether be arranged heat-recovery section,
Five preheating section, a bringing-up section, two bringing-up sections, soaking zone sections, each segment length and height are shown in Table 1.
Each section of size of 1 heating furnace of table
| Section name | Heat-recovery section | Preheating section | One bringing-up section | Two bringing-up sections | Soaking zone |
| Length (unit mm) | 20775 | 7900 | 6775 | 6775 | 7275 |
| Highly (unit mm) | 3200 | 4200 | 4200 | 4200 | 3700 |
Water beam is arranged as 5 walking beams and 6 fixed beams in furnace, and water beam diameter is 140mm, wraps up with a thickness of 70mm, water
Beam takes the mode of Vaporizing cooling.
S1: the combined radiation coefficient between steel billet temperature and furnace temperature is calculated according to steel billet black box measured data.It introduces real
Measured data should include at least following table 2 particular content:
2 measured data project table of table
| Number | Data items | Remarks |
| 1 | The periodic recording time | Record period is usually 1 minute |
| 2 | Top furnace gas temperature | |
| 3 | Steel billet upper face even buried | |
| 4 | The non-aqueous beam portion center even buried of steel billet | |
| 5 | Steel billet water beam portion center even buried | |
| 6 | Steel billet water beam portion lower part even buried | |
| 7 | The non-aqueous beam portion lower part even buried of steel billet |
Using following algorithm, respectively in steel billet water beam portion point and non-aqueous beam portion point, one-dimensional model is established respectively, is calculated separately
The combined radiation coefficient in each period out；
In formula, k is Boltzmann constant, and ε is complex heat transfer coefficient, TfFor furnace temperature, TsFor steel billet temperature, λ is that steel billet is thermally conductive
Coefficient, Δ τ are time step, and Δ y is spatial mesh size, and ρ is steel billet density, CpFor steel billet specific heat；τ indicates timing node；TτAnd Tτ+1Respectively indicate the temperature at τ moment and τ+1 moment steel billet；S indicates nodes of locations；TsAnd Ts-1Respectively surface node and surface to
The temperature of one node layer of inside steel billet.
S2: according to the water beam portion position combined radiation coefficient different from non-aqueous beam portion position, appropriateness carries out data scrubbing, utilize with
Lower formula calculates corresponding sheltering coefficient
Kshade=σskid/σ
S3: it chooses comprising prolonging furnace wide direction interception inside steel billet two-dimensional section centered on water beam shaded portions, divides two dimension
Grid establishes two dimensional model, and highly with heating steel billet with height, width is that (width is constituted 1960mm are as follows: the direct shaded portions of water beam
280mm, another each water intaking not direct shaded portions of beam are each 840mm in two sides).Such a section is put into full furnace temperature tracking
In calculating, water beam sheltering coefficient is introduced, calculates top, the non-aqueous beam position in lower part, the lower part position Shui Liang calculates hot-fluid, side hot-fluid
It is specific to count for 0 (being considered the taken in section in the middle part of steel billet in calculating, height on both sides direction temperature is mutually thermally conductive similar to not occurring)
Process is calculated as shown in Fig. 2, using following algorithm:
S4: to steel billet temperature section described in S3 after carrying out lasting temperature tracking, using process as shown in Figure 3
Correlated judgment is carried out, steel billet is completed and heats the black print temperature difference requirement control of required water beam in furnace.
It is T that steel billet requires the black print temperature difference of most water beams of control in heating furnacer, choose and calculate two-dimension temperature section
In, the minimum temperature spot T of temperaturelowWith the highest point T of bottom temphigh, difference between the two is the black real-time temperature difference of print of water beam
Tskid=Thigh-Tlow；
Work as Tskid> TrWhen, it is judged as that the black print temperature difference of water beam is unsatisfactory for heating requirements, comes out of the stove the time in the control of overall steel billet
On the basis of increase by 3 minutes soaking times；Work as Tskid< TrOr Tskid=TrWhen, determine that the black print temperature difference of water beam meets heating requirements, has
Standby condition of coming out of the stove.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of the technical program, should all be covered in the present invention
Scope of the claims in.
Claims (6)
1. the control method of the black print temperature difference of steel billet water beam in a kind of walking beam heating furnace furnace, it is characterised in that: this method includes
Following steps:
S1: according to the combined radiation coefficient of steel billet black box measured data inverse steel billet bottom water beam portion point and non-aqueous beam portion point；
S2: according to the water beam portion position of the step S1 calculating combined radiation coefficient different from non-aqueous beam portion position, data correctness is carried out
After judgement, the sheltering coefficient of water beam portion point is calculated；
S3: it chooses comprising intercepting inside steel billet two-dimensional section along wide direction centered on water beam shaded portions, divides two-dimensional grid, build
It is close to calculate respective hot-fluid according to the difference on steel billet top, steel billet lower part water beam portion position and non-aqueous beam portion position for vertical two dimensional model
Degree establishes section temperature tracking, periodically calculates the temperature of each temperature spot on section；
S4: the black print temperature difference of the water beam portion calculated in real time point and technique are required the black print of water beam by the steel billet that will be come out of the stove for every piece
The control temperature difference compares, and to the steel billet for not being inconsistent the black print control temperature difference of Heshui beam, the mode for increasing heating time is taken to meet
Technique requirement.
2. the control method of the black print temperature difference of steel billet water beam, feature in walking beam heating furnace furnace according to claim 1
Be: in step sl, the measured data includes the even buried of steel billet water beam portion position even buried depth value, the non-aqueous beam portion position of steel billet
Depth value, cycle detection furnace temperature, even buried point detection numerical value, the steel billet location information periodically acquired, note periodically acquired
Record the periodic quantity and steel billet steel information of data.
3. the control method of the black print temperature difference of steel billet water beam, feature in walking beam heating furnace furnace according to claim 2
Be: in step sl, the combined radiation coefficient for calculating steel billet bottom water beam portion point and non-aqueous beam portion point is taken with lower section
Method:
In steel billet bottom water beam portion point and non-aqueous beam portion point, one-dimensional Thick Plate Model is established respectively, then each black box acquires data
The combined radiation coefficient in period is calculated with following equation:
In formula, k is Boltzmann constant, and ε is complex heat transfer coefficient, TfFor furnace temperature, TsFor steel billet temperature, λ is the thermally conductive system of steel billet
Number, Δ τ are time step, and Δ y is spatial mesh size, and ρ is steel billet density, CpFor steel billet specific heat；τ indicates timing node；T τ and T τ+1
Respectively indicate the temperature at τ moment and τ+1 moment steel billet；S indicates nodes of locations；TsAnd Ts-1Surface node and surface are distinguished to steel
The temperature of a node layer inside base.
4. the control method of the black print temperature difference of steel billet water beam, feature in walking beam heating furnace furnace according to claim 3
Be: in step s 2, the combined radiation coefficient different from non-aqueous beam portion position according to water beam portion position calculates water beam portion point
Sheltering coefficient specifically uses following formula:
Kshade=σskid/σ
K in formulashadeFor sheltering coefficient, σskidFor the combined radiation coefficient value of water beam portion point, σ is the combined radiation of non-aqueous beam portion point
Coefficient value.
5. the control method of the black print temperature difference of steel billet water beam, feature in walking beam heating furnace furnace according to claim 4
It is: in step s3, the two-dimentional steel billet temperature calculation models of the black print of water beam and its peripheral part is established according to following methods:
Primary condition:
The T of τ=0 (x, y, 0)=To(x,y)
Boundary condition:
Each different position calculates separately the input of the heat flow density on the different position in each boundary of steel billet:
Hot-fluid including water beam portion point:
The hot-fluid in non-aqueous beam bottom portion:
Top hot-fluid:
Heat flow input in two sides is 0；
In formula, x is the length in section, that is, the length of the water beam and its adjacent part intercepted；Y is the height in section, also
It is the height of steel billet；The τ time；T (x, y, τ) is the temperature for appointing point in steel billet unit；λ is steel billet thermal coefficient, and ρ is that steel billet is close
Degree, CPFor steel billet specific heat；CgwmCarry out radiation coefficient to lead；kshadeFor the position Shui Liang sheltering coefficient；kbtmIt is corrected for bottom hot-fluid and is
Number；ktopFor top the amended parameters of thermal flow.
6. the control method of the black print temperature difference of steel billet water beam, feature in walking beam heating furnace furnace according to claim 5
It is: in step s 4, the water required using the black print temperature difference comparison heating furnace heating steel billet technique of the water beam portion calculated in real time point
The black print of beam controls the temperature difference, and the mode for increasing heating time is taken to meet heating total demand, specific as follows:
It is T that steel billet requires the black print temperature difference of most water beams of control in heating furnacer, it chooses and calculates in two-dimension temperature section, temperature
Minimum temperature spot TlowWith the highest point T of bottom temphigh, difference between the two is the black real-time temperature difference T of print of water beamskid=
Thigh-Tlow；
Work as Tskid> TrWhen, it is judged as that the black print temperature difference of water beam is unsatisfactory for heating requirements, controls the basis for time of coming out of the stove in overall steel billet
3 minutes soaking times of upper increase；Work as Tskid< TrOr Tskid=TrWhen, determine that the black print temperature difference of water beam meets heating requirements, has out
Fire bars part.
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| CN112139252A (en) * | 2020-09-01 | 2020-12-29 | 南京钢铁股份有限公司 | Rolled piece thickness optimization control method for heated water beam mark |
| CN112361807A (en) * | 2020-10-29 | 2021-02-12 | 北京科技大学 | Automatic identification method for water beam mark |
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