MXPA00003226A - Method for determining and controlling material flux of continuous cast slabs - Google Patents
Method for determining and controlling material flux of continuous cast slabsInfo
- Publication number
- MXPA00003226A MXPA00003226A MXPA/A/2000/003226A MXPA00003226A MXPA00003226A MX PA00003226 A MXPA00003226 A MX PA00003226A MX PA00003226 A MXPA00003226 A MX PA00003226A MX PA00003226 A MXPA00003226 A MX PA00003226A
- Authority
- MX
- Mexico
- Prior art keywords
- temperature
- slabs
- flow
- slab
- continuous casting
- Prior art date
Links
- 239000000463 material Substances 0.000 title claims abstract description 28
- 230000001276 controlling effect Effects 0.000 title claims abstract description 7
- 230000004907 flux Effects 0.000 title abstract 3
- 238000009749 continuous casting Methods 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 13
- 238000005096 rolling process Methods 0.000 claims abstract description 13
- 238000004364 calculation method Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 239000007791 liquid phase Substances 0.000 claims abstract description 4
- 235000003805 Musa ABB Group Nutrition 0.000 claims description 13
- 235000015266 Plantago major Nutrition 0.000 claims description 13
- 241000196324 Embryophyta Species 0.000 claims description 11
- 240000008790 Musa x paradisiaca Species 0.000 claims description 8
- 241000013557 Plantaginaceae Species 0.000 claims description 5
- 238000005457 optimization Methods 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 230000001419 dependent Effects 0.000 claims 1
- 238000005266 casting Methods 0.000 abstract description 2
- 230000036962 time dependent Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 8
- 238000004088 simulation Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000018109 developmental process Effects 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 230000000875 corresponding Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 238000003475 lamination Methods 0.000 description 3
- 241000755266 Kathetostoma giganteum Species 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000003111 delayed Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000001809 detectable Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000000284 resting Effects 0.000 description 1
- 239000002965 rope Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000000930 thermomechanical Effects 0.000 description 1
- 238000004642 transportation engineering Methods 0.000 description 1
Abstract
The invention relates to a method for determining and controlling the material flux of continuous cast slabs, in particular steel slabs, by tracking and optimizing the temperature on their transport path between the continuous casting machine and the rolling mill. The known temperature of the liquid phase at the casting die exit of the continuous casting plant and the physical parameters of the slab are used as starting points in order to determine the heat amount and the temperature profile of the slab. The convective intermixture of the heat quantity contained in the slab and the time-dependent heat loss of the slab, which is inhomogeneously cooling to the surrounding medium, are then calculated by means of a mathematical/physical model. The result of the calculation is used, optionally together with the measured surface temperature of the slab, in order to control the flux of material in an existing slab tracking system.
Description
METHOD FOR DETERMINING AND CONTROLLING THE FLOW OF MATERIAL IN THE CONTINUOUS GLIDING OF RIMS Description of the invention The invention relates to a method for determining and controlling the flow of material in the continuous casting of slabs, in particular steel slabs by tracking and the optimization of the temperature in its transport route to the rolling mill. For the operator of a continuous casting plant with a series of rolling mills, as well as in the projects for the adjustment of the continuous castings of the llantones as an intermediate stage between the continuous casting plant and the rolling mill, it is increasingly important to know the heat content of the finished or interim deposited llanton in order to incorporate the plantain in an economically optimal way to a flow of material corresponding to the heat content still existing in it. Since the temperature profile of a finished flat tire is not homogeneous and tends towards a more homogeneous temperature profile in the long run, it is not possible to deduce the average tire temperature based on the measurable surface temperatures. Therefore, there is also no possibility of knowing the temperature profile of the flange after a certain intercoefficient of time, for example in order to
to provide the plate with an optimum homogeneous rolling temperature by means of a post-heating installation. Finally, the solidified llanton that leaves the smelter goes through several stages of transportation and processing that in each case result in different profiles of the flatness temperature. Depending on whether the tire is transported with or without thermal insulation on a roller conveyor, that one or more slabs are deposited in the stack, that it is an outdoor tire tank 10, or that the slabs are deposited in an open or closed smelting pit, differences in the temperature profile occur. Different temperature profiles are also produced in the case of floats cooled in an accelerated manner in an immersion tank 15 compared to those cooled in a delayed manner in a water spraying installation. Therefore, it is evident that one should aspire to find and know the unfolding of the cooling of the various slabs in order to apply the knowledge in a specific way to follow the material and control the flow of material, which until now were based on predominantly in empirical coefficients and test results. Taking as a starting point the problems discussed, the task of the present invention is that of
^ ugg Í¡gg ^^^^^ g ^ ^^ ¿^^^ ¡| * ^^^^ Ítt _________________ t. ___ to find a method to detect and control the flow of material in the continuous casting of slabs, in particular J ** steel slabs, to determine and take advantage of
• Specifically the amount of heat and the temperature profile of an Egpfcliícuido tire in continuous casting in its path between the continuous casting plant and the rolling mill, to employ the coefficients found in an existing tire tracking system for the purpose to obtain an optimum material flow in the energy aspect Jfc 10, that is, economical and safe. For the solution of the task it is proposed according to the invention that, to determine the heat quantity and the temperature profile of the flathead, using as a starting point the known temperature of
the liquid phase at the exit of the shell of the continuous casting plant and the known physical parameters of the flat, are calculated by a physico-mathematical model the convective intermixing of the amount of heat
• contained in the flatness and the heat loss of the flathead,
whose cooling is not homogeneous, as a function of time, to the respective environment surrounding it, and the result of the calculation is used, possibly together with the measured temperature of the plantain surface, to control the flow of material in an existing system of follow up
plantains.
With the proposition of the invention it is possible to drive a tire in a controlled manner through the various flows of material as feed lamination
• warm, hot-fed lamination, cold-fed lamination or direct hot rolling from the continuous casting plant to the rolling mill. It is possible to find the unfolding of the cooling of various slabs in the stack as well as to determine the cooling performance in the surface of various slabs to deduce the internal temperature of the slab with control measurements. With ls > s coefficients determined by the calculation as well as additional data of the production can be preset, for example, the size of the smelting pit, as well as the
application of heat during operation at various average temperatures. In a preferred embodiment of the method according to the invention it is provided that for the calculation
• apply the method of physico-mathematical
two-dimensional finite elements. The methods of calculating finite elements allow the simulation of the most diverse processes, serve to support constructive developments, for the development of commercialization and, in the present case, also of future operator of the
25th floor In the construction the method is applied
- • s * _fe_ «rt. , * »A ______ a¡, J ___« «¡__.« Frequently to make detectable and minimize possible risks through structural mechanical analysis. With the. you can carry out deformation analysis and
• tensions, temperature calculations, thermo-mechanical simulations, and also determinations of natural frequencies and internal forms for the purpose of optimization. Frequently the plant operators already require simulations based on finite element calculations in the projection phase and are incorporated as a formal element of the contract in the installation delivery contract. Calculations using the finite element method are also carried out in the development of physico-mathematical models that should be thrown in line
precise results within a very short time, it is predominantly about parameter studies whose results are derived from analytical formulas. For the present invention, they are used for
• calculations of the mathematical physical model the method of
two-dimensional finite elements, the finite differential method or a software with formulas derived from independent studies of the line. To make possible the realization of the method, it can be incorporated in independent studies of the line a
universal, commercial finite element package. Online
_? __-_ ¿_ _ ^ Ss ». ^ * Stts¡iSb tiBto. < *? «S ___» _. - ^ teásfeafea ^ t is probably too broad and too slow. This is why it should be applied, that is, to program a method (it can also be a finite element method or a finite differential method) that is particularly adapted to the geometry of the slabs (rectangular) and is therefore sufficiently fast. The online process can then be checked with the finite element package independent of the line. As physical parameters of the tire, the coefficient of the material as a function of temperature, such as the density p, the specific heat, will be used jjA 10.
Cp, the thermal conductivity? and the oxidation characteristics. According to the invention, in a
optimization of the method, the result of the calculation and the measured surface temperature of the flatness is linked to an automation of the flow of material in the tire tracking system. • The invention allows to determine in
It is convenient for the development of the temperature of plantations and of stacks of slabs of different sizes under certain cooling conditions, by means of a physico-mathematical model, preferably with a simulation of finite elements or a differential method.
finite. By evaluating behavior during
_ «0 ^« aA_fa ^^ -_- ^^ i i &^ J ^ .. -aa-a ^, ». ^^^ the time course of the average temperature of the flattened as well as selected surface temperatures they can then estimate well the average temperatures of the plantain by measuring the surface temperature. Thus, for example, with the result of the method according to the invention, it is subsequently possible to make statements about how many hours the pre-established average temperature of the flange is maintained in the adjustment device; it is possible to make statements • faith 10 on the totality of the thermal spectrum in the tracking system of the plantains. It has been shown that the process according to the invention and the method described are very flexible in their handling and suitable for solving the task in accordance with the invention of
allow the flow of economic and safe material between the continuous casting plant and the rolling mill. The invention can replace the current control of the plantains based on experiences and empirical coefficients.
• It is no longer necessary to oversize facilities
for security reasons; since with the method according to the invention there exists from now on the possibility of determining and controlling the actual conditions during the flow of material between the continuous casting plant and the rolling mill. The simplest way to explain the invention is based on a practical example. The example assumes that several slabs of continuous casting are deposited in a stack in an open cast pit. Both the average development of the cooling of the various slabs of the stack as well as the unfolding of the cooling of the surfaces of various slabs of the stack must be determined. The goal of an application could be to determine the size of a smelter pit or to predetermine in advance the temperature applications for slabs in the case of different average emperatures during the uninterrupted operation of the production. From a described model, for example, thirteen slabs with 420 elements are discretized. It is sufficient to model half of a flat with the corresponding proportion of the marginal symmetry conditions, and generate the finite element network so that later the average temperature and the control as a function of the time of the process can be captured with ease. Stacking The simulation can be subdivided as follows: 1. Tracking of the cross-sectional temperature of the flange when passing through the melter, which corresponds to the initial temperature profile for
* -n to * ** & & gvsm ». - each individual plate at the beginning of the stack. 2. Simulation of the stacking of the individual slabs • 3. Simulation of the cooling of the stacking of 5 slabs In the first partial stage the solidification of the slab in the casting rope is simulated to generate a profile of the entrance temperature of the slabs to the pit of foundry close to reality. The density of the material, the specific heat and the thermal conductivity depend on the temperature. Although it is true that a convective thermal exchange also takes place in the liquid phase, it was not modeled. To be able to simulate however anyway
The homogenization of the temperature by virtue of the convective intermixing, however, increased the thermal conduction capacity by a factor of 100 with respect to the solid phase. An essential marginal condition is the difference of cooling by water in the areas of
the primary and secondary cooling zones. According to a thermal transmission model, the temperature range of possible surface temperatures is subdivided into sections of various types of thermal transmission (stable evaporation of the film, unstable zone,
for melting, etc.) because different zones for the thermal transmission coefficient are valid for these zones. In some of these areas the transmission coefficient is also a function of the
• coeficienter the surface material of the body 5 is cooled, which in this case is true in particular for heavily rusted surfaces, which should be incorporated in the material coefficients husk. The simulation of the stacking of llantones ^ 10 begins with the introduction of the first slab in the smelting pit. After this, the next tire on the previous one is stacked every 60 seconds. The stacking process ends with the placement of a cold plate on the twelve slabs stacked up to that moment. He
cold plantain reduces the flexion of the hot top plate by its own weight. After depositing the first plane, the corresponding elements of this plane are activated, and for this plane the simulation of the finite elements is carried out.
already in the foundry pit. Follow the second plane and activate the elements of the plane two. This process develops analogously until the last cold plantation is deposited. Now begins the simulation of the entire stack of slabs in the smelting pit. The
essential marginal conditions also in this case are
^^^^^^^^^^? ^^ ^^ i gH ^^^^^^^ g ^^^? ^^^ the thermal coefficients between the surfaces of the slabs and the outside environment. With the exception of the lower resting surface, it is assumed
• for all of the stacking of 5 sills a thermal transmission by convection of air plus radiation. The air convection is calculated with special functions; and that is the result of thermal transmission coefficients of different intensity for the horizontal and vertical surfaces Jfc 10. At high temperatures these are still small with the thermal transmission coefficients of the radiation, but they become dominant at low temperatures. In addition, the ambient temperature is incorporated into the calculation due to the amplitude of the environment of the
ship or the walls of the foundry pit. These should be considered from a representative stack but only in a given spatial angular sector, in the other angular sectors
• Spaces are the adjacent stacks that
have a similar temperature. The lower horizontal surface of the stack is in contact with the floor of the ship. It would be possible to incorporate the floor of the ship itself in the calculation of finite elements, but it is also possible to model the floor
of the ship simply as a semi-infinite body that
«_a -... -, go. . -:. - .._ ^ .. m.,. _aa * _L ._'- ^ • -__ S ___ s ^^ ^ ¡^ '^^^^ fl ^ a ________ IÍ_ÍI_B ^ 3 ~ _ & - ^^ maintains an initial temperature at which there is then a coefficient of thermal transmission as a function of time . • In the case of plantation data, it is now possible to determine the temperature development through the cross section of the flat or the stack of flat blocks. To reincorporate it to the flow of material between the melter and the rolling mill, a steel flange should have a
average plantain temperature between 500 and 600 ° C. At the start of cooling, the first slab still has the temperature profile corresponding to the outlet of the smelter. At the end of the stacking process it is verified that a homogeneous distribution of the temperature in
the stacking if the floor is properly insulated. The upper plane loses relatively a lot of heat during the first hour due to the fact that the cold plate is placed on it, the lower plate is cooled
• Strongly during a very short initial interval, until
that the floor acts in an insulating manner. By linking a physical-mathematical model with the automation of a conventional flow of plantain material, the method according to the invention allows economical and safe control of the
individual slabs between the smelting plant
, __ ^ _- ^ - ___ ^^ continuous and the rolling mill. By means of the control measurements on the surface of the llantones with the incorporation of the coefficients obtained by means of the calculation model it is possible to deduce in a
simple the amount of heat and the temperature profile of the tire, as long as the corresponding marginal conditions are incorporated. In this way it can be determined anywhere between the continuous casting plant and the rolling mill, and particularly in the
deposit sites, how much heat should be associated with
• respective plate and how much energy must be supplied or abducted in order to obtain the optimum temperature profiles for further processing. The invention provides elements to the techan in charge of
design to design the installation in such an optimal way that it is economical to build and operate.
•
i -___- J «_______ ¿^
Claims (4)
- CLAIMS 1. Method for determining and controlling the flow of material in the continuous casting of slabs, in particular • of steel slabs by tracking and 5 optimization of the temperature in its transport path to the rolling mill, characterized in that to determine the heat quantity and the temperature profile of the flange, the known temperature of the liquid phase fc 10 at the outlet of the pipe is used as a starting point. shell of the continuous casting plant and the known physical parameters of the llanton, to calculate by means of a physico-mathematical model the convective intermixing of the quantity of heat contained in the tire and the heat loss of the tire, whose
- The cooling is not homogeneous, as a function of time, to the respective surrounding environment, and the result of the calculation is used, possibly together with the measured temperature of the plantain surface, to control the flow of material in an existing monitoring system. from 20 plantains. 2. Method for determining and controlling the flow of material in the continuous casting of slabs according to claim 1, characterized in that the method of elements is applied to calculate the physico-mathematical model. 25 two-dimensional finite, the finite differential method or a / ^^ 1 software derived from independent studies of
- 3. Method and control the flow of • material in the plantain according to claim 1 and 2, characterized in that the coefficients of the temperature-dependent material such as density p, heat specifc Cp, thermal conductivity are used as physical parameters of the tire. and the oxidation characteristics. 10
- 4. Method to determine and control the flow of • material in the continuous casting of slabs according to claims 1 to 3, characterized in that the calculation result and the measured surface temperature of the slab are linked to the automation of the material flow in 15 the tracking system of the plantains. •
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19744815.1 | 1997-10-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MXPA00003226A true MXPA00003226A (en) | 2001-11-21 |
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