Method and system for determining a series of temperature values of a molten metal bath

Abstract

The invention relates to a method and a system for determining a series of at least two temperature values of a molten metal bath with a device comprising a light cladding wire and a detector. The method according to the invention has proven to be especially suitable for multiple repeated measurements, wherein the temperature of the molten metal bath changes between the measurements.

Description

[0001] The present invention relates to a method and system for determining a series of at least two temperature values ​​for a molten metal pool.

[0002] The temperature of the molten metal pool in a metallurgical vessel is a critical parameter during the metalworking process, determining the quality of the resulting product. A possible method for measuring the temperature of the molten metal pool (specifically, the molten metal pool of iron or steel in the melting environment of an electric arc furnace (EAF)) involves immersing an optical fiber encased in a metal tube into the molten metal. Optical fibers encased in a metal tube are often also referred to as optical cored cables.

[0003] To measure the temperature of a molten metal pool, an optical fiber cored wire is supplied to a metallurgical vessel. The leading edge of the optical fiber cored wire is immersed in the molten metal pool, encountering first a hot atmosphere, then a layer of molten slag, and finally the molten metal pool itself. Once a portion of the optical fiber cored wire is submerged below the surface of the molten metal pool, the optical fiber transmits the thermal radiation received from the molten metal to a detector, such as a pyrometer. A suitable instrument can be associated with the detector used to determine the temperature of the molten metal pool. During this measurement, the immersed portion of the optical fiber cored wire can be partially or completely consumed by the molten metal pool. Once the temperature measurement is complete, the leading edge of the optical fiber cored wire is retracted from the molten metal pool. The retracted leading edge becomes a new leading edge for the next temperature measurement.

[0004] Therefore, this device is suitable for on-demand and semi-continuous temperature measurement in the form of a series of immersion cycles. The operator can obtain temperature measurement results without any direct intervention in the harsh environment near the metallurgical vessel.

[0005] To provide accurate measurement results, blackbody conditions must be ensured near the immersion tip of the optical fiber when obtaining the results. The fiber must be immersed to a sufficient depth below the surface of the molten metal pool and at a position representing the temperature of the liquid molten metal pool within the container. On the other hand, deep immersion will increase the buoyancy force on the optical core and increase the consumption of the optical core during the measurement sequence.

[0006] Several prior art documents disclose methods for supplying optical fibers for metal coating to improve the data quality of temperature measurement results.

[0007] For example, US2007268477A1 discloses a method of supplying wire in which the supply rate is adjusted during the measurement cycle. The thermal response is recorded during the initial supply phase and compared with the detected temperature change in the subsequent second phase. This method has proven advantageous. On the other hand, it has been found that this method consumes a significant amount of optical cored wire, and that measurement accuracy can still be further improved. This is likely due to the initial phase, during which most of the optical cored wire is not immersed in the molten metal pool but encounters the furnace environment or slag layer. These factors become more pronounced, especially when a range of temperatures is desired to be measured.

[0008] US2018180484A1 discloses a method for measuring the temperature of a molten metal pool, suitable for multiple measurement cycles without additional equipment. The proposed feeding scheme includes two feeding rates followed by a static period, after which temperature measurement is performed. On the one hand, this method addresses some of the problems previously known. On the other hand, it does not address the constantly changing conditions during the metal production process, particularly the temperature rise of the molten metal, which affects the selection of the optimal temperature measurement scheme.

[0009] Given the current technology, there is a need for measurement methods and systems that provide high accuracy across multiple measurement cycles while minimizing the consumption of optical cored wire.

[0010] Therefore, an object of the present invention is to provide an improved method for determining a series of at least two temperature values ​​for a molten metal pool. In particular, one object is to provide a method with improved measurement accuracy. Furthermore, an object is to provide a method that minimizes the consumption of optical cored wire during a series of measurements.

[0011] Another object of the present invention is to provide an improved system for carrying out the method of the present invention.

[0012] These objectives are achieved through the subject matter defined in the independent claims.

[0013] This invention provides an apparatus for determining a series of at least two temperature values ​​T of a molten metal pool using a device comprising a cored wire and a detector. mes (n) and T mes (n+1) methods, which include:

[0014] (a) Provide the predicted temperature value T of the molten metal pool. pred Datasets associated with the corresponding measurement profile MP;

[0015] (b) A model F(t) is provided to describe the temperature development of the molten metal pool over time;

[0016] (c) Define the time step Δt;

[0017] (d) Select a future time point t(n) and predict the temperature T of the molten metal pool at time point t(n). pred (n);

[0018] (e) From the predicted temperature value T pred The dataset selection provided, associated with the corresponding measurement profile MP, corresponds to the predicted temperature value T. pred The measurement profile MP(n) of (n);

[0019] (f) Apply the measurement profile MP(n) at time point t(n) to obtain the measured temperature value T. mes (n);

[0020] (g) Based on the measured temperature value T mes The predicted temperature T of the molten metal pool is calculated using model F(t) and time step Δt. pred (n+1);

[0021] (h) From the predicted temperature value T pred The dataset selection provided, associated with the corresponding measurement profile MP, corresponds to the predicted temperature value T. pred The measurement profile MP(n+1) of (n+1);

[0022] (i) Apply the measurement profile MP(n+1) at time point t(n+1) to obtain the measured temperature value T. mes (n+1), where t(n+1) is defined as

[0023] t(n+1)=t(n)+Δt.

[0024] Furthermore, the present invention provides a series of at least two temperature values ​​T for determining the molten metal pool. mes (n) and T mes A system of (n+1) elements, comprising a device and a module adapted to interact with the device, wherein the device includes an optical cored wire and a detector, and wherein the module includes a storage unit, a processing unit, and a control unit, wherein the storage unit includes:

[0025] (a1) is used to provide the predicted temperature value T of the molten metal pool. pred Storage element for the dataset associated with the corresponding measurement profile MP;

[0026] (a2) Storage element used to supply the model F(t) describing the temperature development of the molten metal pool over time;

[0027] (a3) Storage element used to define time step Δt;

[0028] The processing unit includes:

[0029] (b1) Used to select a future time point and predict the temperature T of the molten metal pool at that future time point. pred Processing components;

[0030] (b2) is used to predict the temperature value T. pred The dataset selection provided, associated with the corresponding measurement profile MP, corresponds to the predicted temperature T. pred The processing element for measuring the MP profile;

[0031] (b3) Used for measurements based on temperature value T mes The model F(t) and time step Δt are used to calculate the predicted temperature T of the molten metal pool. pred Processing components,

[0032] And the control unit includes:

[0033] (c1) is used to apply the measurement profile MP at a certain point in time to obtain the measured temperature value T. mes The control element.

[0034] Preferred embodiments are defined in the dependent claims. Preferred embodiments may be implemented individually or in any possible combination.

[0035] The method according to the invention has proven particularly suitable for repeated measurements, wherein the temperature of the molten metal pool varies between the measurements. Specifically, the temperature typically increases due to continuous heating. Surprisingly, it has been found that the quality of the measurement data depends on the measurement profile used to obtain the measurement. In particular, the supply of the cored wire to the molten metal pool has been considered an influence on quality. The method of the invention allows for the determination of various temperature values ​​of the molten metal pool using a matched measurement scheme. Furthermore, the method of the invention allows for reliable positioning of the cored wire and its leading edge, which additionally enables the acquisition of accurate temperature values ​​with minimal consumption of the cored wire. As used herein, the term "consumption" refers to the disintegration of the cored wire, such as, for example, the cored wire being melted and dissolved into the molten metal pool, the decomposition or burning of the entire cored wire or different portions thereof.

[0036] This invention provides a method for determining a series of at least two temperature values ​​T mes (n) and T mes The method is (n+1). This paper uses a series of temperature values ​​to describe the determination that is repeated at least once. The series of temperature values ​​includes at least the temperature value T. mes (n) and T mes (n+1). Except for Tmes (n) and T mes In addition to (n+1), other temperature values ​​can be determined.

[0037] Throughout this application, variables relating to temperature or temperature values ​​will be referred to by the uppercase letter T, while variables relating to points in time, durations of time, or time in general will be referred to by the lowercase letter t.

[0038] Variables without a specified index (i.e., (n) or (n+1) etc.) will generally be used to define the variable. Variables with a specified index will be used to refer to the variable in a specific context. For example, T mes This refers to the measured temperature value T. mes The general definition of T, and T mes (n) refers to the specific measured temperature value.

[0039] According to the present invention, a temperature value can be determined by measuring the temperature. The temperature measurement can be, for example, a single-point or multi-point measurement, and possibly related data processing.

[0040] Measured temperature value T mes (n) is understood as the temperature value obtained through measurement at a specific time point t(n). Therefore, the measured temperature value T mes (n+1) is the temperature value obtained at a specific time point t(n+1).

[0041] As used herein, the term "molten metal pool" describes a melt in a container. An alternative term known to those skilled in the art is "molten metal." The molten metal in a molten metal pool is not particularly limited. According to a preferred embodiment, the molten metal is molten steel. The term "molten metal pool" does not exclude the presence of any solid or gaseous portion, including, for example, a non-molten portion of the corresponding metal. A molten metal pool may be covered with a layer of slag.

[0042] The temperature of molten metal varies and generally depends on the composition of the metal and the stage of the melting process. According to a preferred embodiment, the temperature of the molten metal pool is in the range of 1500°C to 1800°C, and more preferably in the range of 1500°C to 1700°C.

[0043] The molten metal pool can be contained in a container including an inlet point adapted to supply the optical cored wire through which it passes. This inlet point can be located in a side wall panel or in the top of the container covering the core.

[0044] According to the present invention, at least two temperature values ​​T are determined using a device including optical cored wire. mes (n) and T mes(n+1). Preferably, the optical core is an optical fiber laterally surrounded by a metal tube. Preferably, the optical fiber is a flexible, transparent fiber. Optical fibers are most commonly used as devices for transmitting light (especially light in the IR wavelength range) between the two ends of a fiber. Preferably, the optical fiber is formed of glass or plastic, more preferably of quartz glass. Preferably, the optical fiber is selected from graded refractive index fibers and single-mode step refractive index fibers.

[0045] The metal tube surrounding the optical fiber can completely encircle the fiber, or it can be at least partially open so that the shell does not completely encircle the fiber.

[0046] Preferably, the metal tube surrounding the optical fiber is made of iron or steel, and more preferably stainless steel.

[0047] In a preferred embodiment, the linear density of the optical cored wire is in the range of 25 g / m to 80 g / m, more preferably in the range of 35 g / m to 70 g / m. The linear density is defined by its mass per unit length.

[0048] Preferably, the optical cored wire is laterally surrounded by at least one additional metal tube, that is, at least two metal tubes laterally surround the optical fiber. Preferably, the optical cored wire is centrally arranged in at least one additional metal tube.

[0049] Preferably, the at least one additional metal tube does not contact the optical cored wire. More preferably, the gap between these at least two metal tubes is at least partially filled with a material selected from gaseous or solid materials or combinations thereof. The solid material is preferably selected from inorganic materials, natural polymers, synthetic polymers, and combinations thereof. The gaseous material is preferably a gas or a mixture of gases. More preferably, the gas is air or an inert gas.

[0050] According to a preferred embodiment, the optical cored wire includes a plurality of separating elements arranged in at least one metal tube, thereby forming at least one compartment between the separating elements. Here, the term "compartment" refers to the volume between the different separating elements in the tube. The term "separating element" refers to a component arranged inside the tube that subdivides the volume within the tube. Preferably, the separating element is a disc-shaped element arranged inside the tube including an opening through which the optical cored wire extends, and the tube at least partially supports the optical cored wire. The material of the separating element is preferably selected from silicone resin (preferably a two-component silicone resin), rubber, leather, cork, metal, and combinations thereof.

[0051] The optically cored wire is optionally surrounded by at least one additional layer. This at least one additional layer may or may not replace the at least one additional metal tube. In a preferred embodiment, the at least one additional layer comprises a plurality of elements; more preferably, the layer comprises fibers.

[0052] In another preferred embodiment, the material of the at least one additional layer has the form of a mesh, reticulated structure, woven or knitted structure.

[0053] Preferably, the at least one additional layer comprises a non-metallic material, and most preferably an organic material.

[0054] It should be understood that optical cored wires may include any combination of the above configurations. For example, it may be advantageous for the optical cored wire to be laterally surrounded by an additional layer and a second metal tube.

[0055] The apparatus for applying the method according to the invention further includes a detector. The detector is coupled to one end of an optical cored wire and receives optical signals transmitted by the optical fiber, particularly optical signals in the IR wavelength range. Preferably, in the context of this invention, the detector is a pyrometer.

[0056] The optical cored wire has an immersion end and a opposite end. The leading tip of the optical cored wire is the tip of the immersion end. Preferably, when applying the method according to the invention, the optical cored wire is consumed in the direction from the immersion end toward the opposite end, and after each measurement sequence, another portion of the optical cored wire will be the immersion end; that is, a new leading tip is generated after each measurement sequence. The opposite end is connected to the detector and will not be consumed during measurement.

[0057] In step (a) of the method according to the invention, a predicted temperature value T for the molten metal pool is provided. pred The dataset associated with the corresponding measurement profile MP.

[0058] Preferably, the dataset includes data pairs in which a specific value of one type of data is assigned to a specific value of another type of data. More preferably, the dataset includes data pairs in which a specific value of one type of data is assigned to a model, a sequence of steps, etc.

[0059] Preferably, the predicted temperature value T pred This is a temperature value not obtained through measurement; that is, the predicted temperature value is an estimated, anticipated, or calculated temperature value. Predicted temperature value T pred The possible source is an empirically derived temperature value. Preferably, the empirically derived temperature value of the molten metal pool is based on known characteristics of the molten metal pool combined with known process parameters of the metal production process. Such characteristics may be, for example, the mass of metal supplied in the molten metal pool, the composition of the metal, or the geometry of the container. Process parameters in this context may be the heating rate or energy consumption, which are typically known parameters in the metal production process. Alternatively, the predicted temperature value T can be derived based on calculations. pred Preferably, this calculation is based on a model of the evolution of the temperature of the molten pool of interest, which incorporates known temperature values ​​(e.g., from previous measurements).

[0060] The measurement profile MP should be understood as a sequence of steps to obtain a value of interest. In the context of this invention, the value of interest is the temperature of the molten metal pool.

[0061] In a preferred embodiment, the measurement profile MP defines at least one of the following steps:

[0062] (i) The leading tip of the optical cored wire is positioned above the surface of the molten metal pool;

[0063] (ii) During the time period from t0 to t2, at least one supply rate v fed The tip of the bright cored wire is supplied toward and below the surface of the molten metal pool, wherein the tip of the bright cored wire is below the surface of the molten metal pool during the time period from t1 to t2;

[0064] (iii) Obtain temperature information during the measurement time period from t1 to t2;

[0065] (iv) at a speed v ret The leading tip of the optical cored wire is retracted back to a position above the molten metal pool.

[0066] In other words, preferably, the measurement profile MP defines at least steps (i) and / or (ii) and / or (iii) and / or (iv). Preferably, the measurement profile MP defines steps (i), (ii), (iii) and (iv).

[0067] It should be understood that t1 and t2 are later than t0, and t2 is later than t1. t1 is the time point when the tip enters the molten metal pool; that is, the time point when the tip is immersed below the surface of the molten metal pool. t2 is the time point after the tip retracts towards its position above the surface of the molten metal pool.

[0068] Preferably, steps (i), (ii), and (iv) are performed in a sequential order.

[0069] Preferably, step (iii) is performed at least in part during step (ii).

[0070] Those skilled in the art will understand that "providing a front tip" and "supplying a front tip" necessarily include providing and supplying optical cored wire, that is, providing optical cored wire with a front tip and moving optical cored wire with its front tip.

[0071] It should be understood that the supply velocity v fed It refers to the average speed of the tip during its orientation toward and below the surface of the molten metal pool.

[0072] The surface of the molten metal pool can be the surface facing the surrounding environment of the container, or, in the case of a slag layer, the surface facing the slag layer.

[0073] To obtain temperature information, radiation emitted from the molten metal pool and transmitted to the detector by the optical cored wire is recorded, particularly radiation in the IR wavelength range. The intensity and / or spectral information of the radiation can be processed by a processing unit connected to the detector. Preferably, the tip of the optical cored wire is immersed below the surface of the molten metal pool at the time point of temperature acquisition or during the measurement period of temperature acquisition.

[0074] Preferably, in order to achieve a determined measured temperature value T mes Temperature information is obtained through the following steps. Preferably, the measured temperature value T is determined. mes This includes measuring a single data point or measuring more than one data point; that is, measuring a series of data points.

[0075] Preferably, the measured temperature value T mes It is the mean of a series of data points. More preferably, the measured temperature value T is derived from an algorithm that processes a series of data points. mes .

[0076] In a preferred embodiment, the supply in step (ii) of measuring the profile MP includes at least two supply speeds v. fed 1 and v fed 2. It should be understood that the supply rate v fed 1 and v fed 2 refers to the average speed of the tip of the optical cored wire.

[0077] Preferably, the feeding in step (ii) of measuring the profile MP includes feeding the tip at a feeding rate v during the period from t0 to t1. fed 1 and the second supply rate v of the supply tip during the period from t1 to t2 fed 2.

[0078] In a preferred embodiment, the second supply rate v fed 2 includes more than one supply rate.

[0079] According to a preferred embodiment, the measurement profile MP is further defined as a step within a static time period from t1 to t2, during which the supply of the tip of the optical cored wire is paused, or the tip of the optical cored wire is supplied at a low speed. As used herein, "pausing the supply of the tip" means not actively moving the tip. Both alternatives, namely pausing the supply or supplying at a low speed, cause the position of the tip to move towards the surface of the molten metal pool due to consumption. However, the tip remains submerged below the surface of the molten metal pool.

[0080] The low speed is preferably below 0.2 m / s, and more preferably below 0.1 m / s.

[0081] Preferably, the predicted temperature value T of the molten metal pool is... pred The dataset associated with the corresponding measurement profile MP additionally correlates the measurement profile with the characteristics of the optical core wire.

[0082] Preferably, the characteristic of optical cored wire is its linear density.

[0083] Preferably, the longer the duration of the measurement profile MP from t0 to t2 is defined, the higher the linear density of the optical cored wire.

[0084] Preferably, the supply speed v of the measured contour MP is... fed The lower the limit, the higher the linear density of the optical cored wire.

[0085] In step (b) of the method according to the invention, a model F(t) describing the temperature development of the molten metal pool over time is supplied.

[0086] The model F(t) describing the temperature development of the molten metal pool over time is a model that defines the relationship between time t and temperature T; that is, the model is adapted to predict the temperature T(n) at a specific time point t(n). In a typical melting process, time is directly related to the electrical energy input.

[0087] Preferably, time t is included as an input parameter in the model F(t), but F(t) can also be independent of time t as an input parameter.

[0088] Preferably, the model F(t) includes mathematical equations, characteristic curves, or other information defining the relationship between time and temperature of the molten metal pool. The model may contain descriptions of the physical properties of the molten metal pool, the characteristics of the metallurgical facility, and the corresponding model parameters.

[0089] Preferably, the physical properties of the molten metal pool are taken into account in the model F(t).

[0090] Preferably, the model F(t) is derived using a method selected from numerical methods, analytical methods, experimental methods, and combinations thereof.

[0091] Preferably, the model F(t) describing the temperature development of the molten metal pool over time is based on recorded measurements, i.e., data obtained during previous melting processes.

[0092] In the preferred embodiment, the predicted temperature value T pred Or measure the temperature value T mesIt can be the only input parameter of the model F(t). In other examples, other input parameters can be used, preferably operation parameters.

[0093] In this context, operating parameters are parameters related to the melting process, such as electrical energy input or the amount of chemical supplements that have been added to the molten metal pool.

[0094] In an exemplary implementation, the model describing the temperature evolution F(t) is a linear function.

[0095] Preferably, the first derivative F'(t) of the model F(t) describing temperature development is a linear function.

[0096] In a preferred embodiment, the model F(t) describing the temperature development of the molten metal pool over time is derived by a method including the following steps:

[0097] (i) Provide a dataset that correlates the characteristics of a molten metal pool with recorded data on a model F(t) of the temperature development of the molten metal pool over time;

[0098] (ii) Provides the characteristics of a molten metal pool;

[0099] (iii) Receive the model F(t) corresponding to the characteristics of the molten metal pool from the provided dataset that correlates the characteristics of the molten metal pool with the recorded data of the model F(t) about the temperature development of the molten metal pool over time.

[0100] In step (c) of the method according to the invention, the time step Δt is defined.

[0101] The time step Δt should be understood as the duration.

[0102] The duration of time step Δt is not further limited. Preferably, the duration of time step Δt is in the range of 5 s to 3 min, more preferably in the range of 15 s to 2 min, and most preferably in the range of 30 s to 90 s.

[0103] Preferably, the duration of time step Δt is selected based on the operating parameters.

[0104] In a preferred embodiment, the duration of time step Δt is derived by a method including the following steps:

[0105] (i) Provide a dataset that correlates the operating parameters with the duration of time step Δt;

[0106] (ii) Provide operating parameters;

[0107] (iii) Receive the duration of the time step Δt from the provided dataset that correlates the operation parameter with the duration of the time step Δt corresponding to the operation parameter.

[0108] Preferably, the duration of the time step Δt is selected based on the measured temperature value T determined in step (f). mes (n).

[0109] In a preferred embodiment, the time step Δt is derived by a method including the following steps:

[0110] (i) Provide the measured temperature value T mes Dataset related to the duration of time step Δt;

[0111] (ii) From the measured temperature value T mes With respect to the measured temperature value T mes The duration of time step Δt is related to the duration of the time step selected in the provided dataset.

[0112] Preferably, for both of the previously described embodiments, step (c) is performed after step (f).

[0113] In step (d) of the method according to the invention, a future time point t(n) is selected and the temperature value T of the molten metal pool at that time point t(n) is predicted. pred (n).

[0114] The term "prediction" in this article refers to the prediction of the future temperature value T at a future time point t(n). pred The prediction of (n). That is, the prediction of the temperature value T. pred (n) is the expected temperature at that future time point t(n).

[0115] The choice of the future time point t(n) is not further restricted. Preferably, this future time point is related to a specific point in the metal melting process, such as after a specific period of time after the start of the process, after a certain amount of chemical supplement has been added, or after a certain amount of energy has been consumed. "Energy consumption" in this context refers to the amount of energy consumed during the melting process; that is, the amount of energy that has been supplied to the molten metal pool.

[0116] In a preferred embodiment, a time point is provided that is correlated with the predicted temperature value T. pred In step (d), the predicted temperature value T is selected from the relevant dataset. pred (n). Most preferably, the predicted temperature value T in this dataset pred This represents a temperature value derived from experience; preferably, it is a recorded temperature value from a previous melting process.

[0117] In step (e) of the method according to the invention, from the predicted temperature value T pred The dataset selection provided, associated with the corresponding measurement profile MP, corresponds to the predicted temperature value T. pred The measurement profile MP(n) of (n).

[0118] According to the preferred embodiment, the selected temperature profile MP(n) is additionally related to the characteristics of the optical cored wire.

[0119] In step (f) of the method according to the invention, a measurement profile MP(n) is applied at time point t(n) to obtain the measurement temperature value T. mes (n).

[0120] The application of the measurement profile MP(n) results in the determination of the measured temperature T of the molten metal pool at time point t(n). mes (n).

[0121] Measured temperature value T mes (n) can be higher or lower than the predicted temperature T pred (n).

[0122] Due to the measured temperature value T mes (n) may be different from the predicted temperature T. pred (n), therefore, the relevant time points in the model F(t) describing the temperature development of the molten metal pool over time can be different. In other words, the temperature value T is obtained from different time points. mes The time point t(n) of F(n) does not necessarily correspond to the predicted temperature T in the model F(t). pred (n) is the time point.

[0123] In step (g) of the method according to the invention, based on the measured temperature value T mes The predicted temperature T of the molten metal pool is calculated using model F(t) and time step Δt. pred (n+1).

[0124] In other words, step (g) measures the temperature T at time point t(n). mes The predicted temperature value T is generated after the duration Δt following (n). pred (n+1). The prediction is based on model F(t), where the measured temperature value T mes (n) and time step Δt are used as input parameters. Additionally, the measured temperature value T... mes (n) is also directly related to the time point t(n).

[0125] In step (h) of the method according to the invention, the predicted temperature value T is... predThe dataset selection provided, associated with the corresponding measurement profile MP, corresponds to the predicted temperature value T. pred The measurement profile MP(n+1) is (n+1).

[0126] According to the preferred embodiment, the temperature profile MP(n+1) is selected to be additionally related to the characteristics of the optical cored wire.

[0127] In step (i) of the method according to the invention, a measurement profile MP(n+1) is applied at time point t(n+1) to obtain the measurement temperature value T. mes (n+1), where t(n+1) is defined as

[0128] t(n+1)=t(n)+Δt.

[0129] The application of the measurement profile MP(n+1) results in the determination of the measured temperature T of the molten metal pool at time point t(n+1). mes (n+1).

[0130] In a preferred embodiment, the supply speed v of the measured profile MP(n+1) is... fed (n+1) is a supply speed v higher than the measured profile MP(n). fed (n).

[0131] Preferably, at least two supply rates v are defined. fed 1 and v fed The measurement profile MP of 2 is applicable to both measurement profile MP(n) and measurement profile MP(n+1), where the supply speed v of measurement profile MP(n+1) is... fed 2(n+1) is a supply rate v higher than the measured profile MP(n). fed 2(n).

[0132] Preferably, the duration of the time interval from t1 to t2 for measuring profile MP(n+1) is shorter than that for measuring profile MP(n).

[0133] Preferably, steps (d) to (i) are performed in a sequential order.

[0134] Preferably, step (a) is performed before steps (d) to (i), and most preferably before steps (e) to (i).

[0135] More preferably, the method is performed in one of the following orders:

[0136] (a)-(b)-(c)-(d)-(e)-(f)-(g)-(h)-(i),

[0137] (b)-(a)-(c)-(d)-(e)-(f)-(g)-(h)-(i),

[0138] (b)-(c)-(a)-(d)-(e)-(f)-(g)-(h)-(i), or

[0139] (b)-(c)-(d)-(a)-(e)-(f)-(g)-(h)-(i),

[0140] According to another preferred embodiment, step (b) is performed after step (f).

[0141] More preferably, the method is performed in one of the following orders:

[0142] (a)-(c)-(d)-(e)-(f)-(b)-(g)-(h)-(i), or

[0143] (c)-(a)-(d)-(e)-(f)-(b)-(g)-(h)-(i).

[0144] According to another preferred embodiment, supplying the model F(t) describing the temperature development of the molten metal pool over time includes steps (b1) to (b4):

[0145] (b1) Limiting the predicted temperature T pred With the measured temperature value T mes The maximum temperature difference ΔT between max ;

[0146] (b2) Limit the maximum temperature step size ΔT step ;

[0147] (b3) Measure the temperature value T mes (n) and predicted temperature T pred The difference ΔT(n) between n and the maximum difference ΔT max Compare;

[0148] (b4) Provide the model F(t), where if ΔT(n) is higher than the defined maximum temperature difference ΔT max ,but

[0149] F(t) = T pred (n)+ΔT step .

[0150] According to the preferred embodiment, if ΔT(n) is lower than the defined maximum temperature difference ΔT max If so, the supply F(t) will not be further restricted.

[0151] Preferably, step (b), which includes steps (b1) to (b4), is performed after step (f).

[0152] According to the preferred embodiment, the method is performed in one of the following orders:

[0153] (a)-(c)-(d)-(e)-(f)-[(b)-{(b1)-(b2)-(b3)-b4)}]-(g)-(h)-(i), or

[0154] (c)-(a)-(d)-(e)-(f)-[(b)-{(b1)-(b2)-(b3)-b4)}]-(g)-(h)-(i).

[0155] The method of the present invention, according to a preferred embodiment including steps (b1) to (b4), preferably allows for application based on the maximum temperature step size ΔT. step To predict temperature values.

[0156] Preferably, the temperature step size ΔT step It is the predetermined temperature difference.

[0157] This embodiment of the method of the present invention allows for the avoidance of applying a measurement profile that is least likely to match the actual temperature of the molten metal pool. In other words, this embodiment allows for the adaptation of a measurement temperature value obtained in the first measurement step that is least likely to represent the actual temperature obtained.

[0158] Preferably, the method according to the invention is performed more than once.

[0159] The present invention also provides a series of at least two temperature values ​​T for determining a molten metal pool. mes (n) and T mes A system of (n+1) includes a device and a module, wherein the module is adapted to interact with the device.

[0160] Preferably, the system is configured to perform the method according to the invention, wherein the method includes the following steps:

[0161] (a) Provide the predicted temperature value T of the molten metal pool. pred Datasets associated with the corresponding measurement profile MP;

[0162] (b) A model F(t) is provided to describe the temperature development of the molten metal pool over time;

[0163] (c) Define the time step Δt;

[0164] (d) Select a future time point t(n) and predict the temperature T of the molten metal pool at time point t(n). pred (n);

[0165] (e) From the predicted temperature value T predThe dataset selection provided, associated with the corresponding measurement profile MP, corresponds to the predicted temperature value T. pred The measurement profile MP(n) of (n);

[0166] (f) Apply the measurement profile MP(n) at time point t(n) to obtain the measured temperature value T. mes (n);

[0167] (g) Based on the measured temperature value T mes The predicted temperature T of the molten metal pool is calculated using model F(t) and time step Δt. pred (n+1);

[0168] (h) From the predicted temperature value T pred The dataset selection provided, associated with the corresponding measurement profile MP, corresponds to the predicted temperature value T. pred The measurement profile MP(n+1) of (n+1);

[0169] (i) Apply the measurement profile MP(n+1) at time point t(n+1) to obtain the measured temperature value T. mes (n+1), where t(n+1) is defined as

[0170] t(n+1)=t(n)+Δt.

[0171] For preferred embodiments related to the method of the present invention, refer to the preferred embodiments given above.

[0172] The system according to the invention includes an apparatus comprising an optical cored wire and a detector. For preferred embodiments relating to the optical cored wire and the detector, reference is made to the preferred embodiments given above with respect to the method of the invention.

[0173] The system according to the invention includes modules, wherein the modules include a storage unit, a processing unit, and a control unit.

[0174] Preferably, the storage unit, processing unit, and control unit are configured to interact with each other.

[0175] According to the present invention, the storage unit of the module includes:

[0176] (a1) is used to provide the predicted temperature value T of the molten metal pool. pred Storage elements for the dataset associated with the corresponding measurement profile MP.

[0177] (a2) A storage element for supplying a model F(t) describing the temperature development of the molten metal pool over time; and

[0178] (a3) Storage element used to define time step Δt.

[0179] According to the present invention, the processing unit of the module includes:

[0180] (b1) Used to select a future time point and predict the temperature T of the molten metal pool at that future time point. pred Processing components,

[0181] (b2) is used to predict the temperature value T. pred The dataset selection provided, associated with the corresponding measurement profile MP, corresponds to the predicted temperature T. pred The processing element for measuring the profile MP, and

[0182] (b3) Used for measurements based on temperature value T mes The predicted temperature T of the molten metal pool is calculated using the model F(t) and the time step Δt. pred Processing elements.

[0183] In a preferred embodiment, the processing unit is configured to process information stored in the storage unit.

[0184] According to the present invention, the control unit of the module includes:

[0185] (c1) is used to apply the measurement profile MP at a certain point in time to obtain the measured temperature value T. mes The control element.

[0186] In a preferred embodiment, the control unit is configured as a control device.

[0187] In a preferred embodiment, the system may include a supply device. In the context of this invention, a supply device can be understood as a means that allows the feeding of a bright cored wire into a pool of molten metal. Such a device may be selected from a feeder, supply control, straightener, and guide tube.

[0188] According to a preferred embodiment, the system may further include a coil adapted to the length of the optical cored wire.

[0189] The basic idea of ​​the invention will then be described in more detail with respect to the embodiments shown in the accompanying drawings.

[0190] However, it should be understood that the present invention is not limited to the precise arrangement and tools shown. In this document:

[0191] Figure 1 Schematic cross-sectional views of different designs of optical cored wire are shown.

[0192] Figure 2 A schematic diagram of an exemplary facility with a molten metal pool is shown, the temperature of which should be determined.

[0193] Figure 3A position-time graph is shown, indicating the immersion of the tip of the optical cored wire during the application of a representative measurement profile.

[0194] Figure 4 A position-time graph is shown, indicating the immersion of the tip of the optical cored wire during the application of another representative measurement profile.

[0195] Figure 5 A graph illustrating the relationship between the optimal feed rate and the measured molten pool temperature is shown.

[0196] Figure 6 A graph illustrating the relationship between optimal immersion time and measured molten pool temperature is shown.

[0197] Figure 7 The expected temperature development of the molten metal pool over time in an exemplary EAF process is shown.

[0198] Figure 8 A schematic diagram of a system according to an embodiment of the present invention is shown.

[0199] Figure 9 A schematic diagram of a module according to an embodiment of the present invention is shown.

[0200] Figure 1 Schematic cross-sectional views of different designs of optical cored wires according to exemplary embodiments of the present invention are shown. Figure 1 A shows an optical cored wire 1', which includes an optical fiber 2' surrounded by a metal tube 3'.

[0201] Figure 1 B shows an optical cored wire 1”, which includes an optical fiber 2 surrounded by a metal tube 3”. A second metal tube 4” further surrounds the metal tube 3”. The gap between the two metal tubes 5” is not filled with solid material; that is, the gap may include gas or a gas mixture.

[0202] Figure 1 C shows an optical cored wire 1”', which includes an optical fiber 2”' surrounded by a metal tube 3”' and a second metal tube 4”'. The gap between the two metal tubes 5”' is filled with a filler material, such as fibers from organic materials or alkali-free glass.

[0203] Figure 2 A schematic diagram of an exemplary facility 6 with a molten metal pool 7 is shown, the temperature of which should be determined.

[0204] Facility 6 includes a bare cored wire 1, which is at least partially located on and at least partially extended from coil 8 for measurement. One end of the bare cored wire 9 is connected to a detector 10, which is then connected to a computer system (not shown) to process the data obtained using the bare cored wire 1 and detector 10. A molten metal pool 7 is contained in a container 11, which may be an electric arc furnace (EAF), a ladle metal furnace (LMF), or any converter known to those skilled in the art of molten metal handling. The bare cored wire 1 is guided into the container 11, which has an inlet point 14, via a feeder 12 and a guide tube 13. The configuration shown is for illustrative purposes only; having a corresponding inlet point is not a prerequisite for the invention.

[0205] The configuration shown illustrates an exemplary measurement position for the optical cored wire 1, wherein the leading tip 15 is immersed in the molten metal pool MB. S Below the surface. In the presented embodiment, the optical cored wire 1 is positioned relative to the molten metal pool MB. S The immersion angle of the surface is 90°. However, this angle can vary depending on the structural details of the metallurgical facility.

[0206] The temperature of the portion of the cored wire 1 extending from the coil 8 to the inlet point of the container 14 can be considered low, ranging from room temperature up to 100°C. Once passing the inlet point 14 in the direction of the molten metal pool 7, it first encounters a hot atmosphere up to 1700°C or even higher, followed by a slag layer 17, and then the molten metal pool 7. The inlet point 14 leading to the container can be equipped with an air-blowing nozzle 18 to prevent metal and slag from penetrating into the guide tube 13.

[0207] The optimal liquid level of the molten metal pool 7 in each metallurgical vessel can be roughly known based on the design and operating mode of the metallurgical vessel.

[0208] To obtain temperature measurements, the bare cored wire 1 is fed towards the molten metal pool 7 to the desired immersion depth using its leading tip at the immersion end 15. For reliable temperature measurements, it may be desirable to perform measurements at a more or less fixed immersion depth within the molten metal pool. A suitable supply system 12 will accurately control the supply speed of the bare cored wire 1.

[0209] Following the measurement sequence, the portion of the optically cored wire immersed in the molten metal pool 19 will be melted and thus consumed. The length of this portion is denoted by L. C Instructions. After the measurement is performed, the portion of the optical cored wire 20 that is in the hot atmosphere and extends through the slag layer can be fed back into the direction of the coil 8 and can be reused for the next measurement.

[0210] Figure 3A position-time graph is shown, indicating the immersion of the leading tip of the optical cored wire during the application of a representative measurement profile. The x-axis represents time, while the y-axis indicates the position of the leading tip. The surface of the molten metal pool (MB) is also shown. S The position is indicated for orientation. Before the measurement begins; that is, before t0, the tip is positioned at the starting point. This can be inside the metallurgical container and near the inlet point; that is, near the point where the cored wire enters the container. The cored wire is supplied towards the molten metal pool at a feed rate and fed into the molten metal pool during the duration from t0 to t2. This duration is typically in the range of several seconds. The tip of the cored wire enters the molten metal pool at time t1, that is, t1 is the time point when the tip is immersed below the surface of the molten metal pool. In the graph shown, a single feed rate is applied, but the supply may include several phases with different feed rates. Even a phase without supply may be included during the measurement; that is, a stationary phase, such as... Figure 4 The graph shown illustrates another preferred embodiment. Temperature measurements are obtained during the measurement period from t1 to t2. The tip must be immersed below the surface of the molten metal pool to obtain a reliable measurement. Temperature values ​​obtained earlier in the supply may not necessarily represent the body temperature of the molten metal pool. After t2, the bright cored wire is retracted from the molten metal pool to a position above the surface. Ideally, the surface L of the bright cored wire immersed in the molten metal pool is... C The lower portion is consumed until t2.

[0211] The time required for the immersed portion of the bright cored wire to be completely consumed to the surface of the molten metal pool depends on the temperature of the molten metal and the characteristics of the bright cored wire. These characteristics affecting its melting or consumption behavior include its design and the materials used in its manufacture. For example, a metal tube with a higher wall thickness will melt more slowly than a metal tube of the same material with a thinner wall thickness. Since the higher the expected temperature of the molten metal pool, the faster the bright cored wire is consumed, the higher the temperature of the molten metal pool, the shorter the duration of the profile measurement. For given reasons, it is advantageous to adjust the parameters of the supply scheme according to the measured temperature.

[0212] The melting and devitrification behavior of optical cored wire depends on the amount of heat transfer from the environment, which is directly related to the rate at which the tip is supplied. Especially when previous measurements have been performed, the portion of the immersed end, including the tip, may have already been damaged. The longer the residence time in the heat-demand zone during the previous measurement sequence, the more damage can be observed. Applying the method according to the invention will minimize this damage.

[0213] It has been observed that different parameters applied during the application of a measurement profile to obtain temperature values ​​provide different measurement qualities. The measurement quality of a measurement profile refers to the different measurement accuracy compared to measurements obtained using a fixed-mount standard thermocouple. The basic idea of ​​this invention is to adapt a specific measurement profile to the temperature to be measured. Figure 5 A graph illustrating the relationship between the optimal feed rate (i.e., the application of the measurement profile) during the measurement sequence and the obtained temperature is shown. This correlation can be correlated with the known melting and decomposition behavior of the cored wire, which depends on the temperature of the molten metal pool. Preferably, the faster the average feed rate of the tip is selected, the higher the temperature is expected to be measured.

[0214] Figure 6 This illustrates the optimal immersion duration of the leading tip of the optical cored wire in the measurement sequence (i.e., Figure 3 and Figure 4 The graph shows the relationship between the duration between t1 and t2 and the obtained temperature. The recognized correlation that the higher the molten pool temperature, the shorter the immersion time indicates that the higher the expected temperature of the molten metal pool, the shorter the immersion time of the cored wire in the molten metal component should preferably be selected.

[0215] Figure 7 The expected temperature development of the molten metal pool over time in an exemplary EAF process is shown, illustrating a constant increase in temperature. This development represents an exemplary model of the temperature development of the molten metal pool. Furthermore, Figure 7 This indicates the relationship between the parameters and variables upon which the temperature prediction step is based. According to an embodiment of the invention, a measurement is performed at time point t(n) to obtain the measured temperature value T at that time point. mes (n). The measurement profile applied is based on the previously predicted temperature T at that time point. pred (n) is selected. Due to temperature T pred (n) is the predicted temperature, and therefore this temperature may differ from the measured temperature value T. mes (n). It should be particularly emphasized that, compared to the predicted temperature value T... pred (n) The relevant time point does not necessarily correspond to the measured temperature value T in the model describing the expected temperature development of the molten metal pool. mes (n) The relevant time point t(n). Determining the first measured temperature value T... mes After (n), the time point of the second temperature measurement t(n+1) is defined as after a predetermined duration Δt following t(n). This time point T predThe expected temperature value (n+1) is required as the basis for selecting the most suitable measurement profile for this second measurement. This temperature value is based on the predicted temperature development of the molten metal pool during the duration Δt between t(n) and t(n+1).

[0216] Figure 8 A schematic diagram of a system 30 according to an embodiment of the present invention is shown. System 30 is configured to perform the method according to the present invention. Specifically, the system is configured to provide a dataset relating the predicted temperature to a measurement profile that achieves optimal measurement quality for the corresponding predicted temperature. System 30 is further configured to predict such a temperature. Furthermore, system 30 is configured to define a time step. Additionally, system 30 is configured to calculate the temperature based on a model describing the temperature development of the molten metal pool over time. This calculated temperature should also be understood as the predicted temperature. System 30 is also configured to supply a model. Furthermore, system 30 is configured to select a measurement profile from the provided dataset. The selected measurement profile is based on either the predicted temperature or the temperature calculated based on the model. Furthermore, system 30 is configured to apply the measurement profile.

[0217] The system includes a device 40, which comprises an optical cored wire and a detector. Furthermore, the system includes a module 50. The device 40 and module 50 are adapted to interact with each other; that is, the module is configured to use the device 40 to perform the method according to the invention, thereby obtaining a measurement of the temperature value of the molten metal pool.

[0218] Figure 9 A more detailed schematic diagram of module 50 is shown. Module 50 includes a storage unit 50, a processing unit 70, and a control unit 80.

[0219] Exemplary conditions for the method according to the present invention will be given below. Example:

[0220] Install the device including the optical fiber cored wire according to Figure 2 In a representative electric arc furnace (EAF) facility, the optically cored wire consists of graded refractive index fibers with a core diameter of 50 μm and a stainless steel tube with an outer diameter of 1.3 mm. The fibers with the metal tube are embedded in a stainless steel tube with an outer diameter of 6 mm and a wall thickness of 0.3 mm.

[0221] Waste is loaded into the EAF and the melting process is initiated. For a typical electrical input power of 60MW, based on previous measurements, the expected results are as follows: Figure 7 The temperature development is shown.

[0222] Based on historical data from the metallurgical facility and the cumulative power consumed by the EAF, the expected temperature at the time of the first measurement was 1540°C. A measurement profile with an expected temperature of 1540°C was selected, thus defining an average feed rate of 0.4 m / s and a duration of 1.0 s for this measurement profile. The obtained temperature value was 1560°C, meaning the actual temperature of the molten metal pool was measured to be higher than predicted. For the specific metallurgical facility, a temperature increase of 15°C / min was expected within this temperature range. The next measurement was scheduled 2 minutes after the first measurement; that is, the expected temperature was 1590°C. The measurement profile with an expected temperature of 1590°C defined an optimal average feed rate of 0.5 m / s and a duration of 0.75 s for this profile. After applying the second measurement profile, a measured temperature value of 1600°C was obtained at a point within 1 minute of the first measurement.

[0223] A third measurement was scheduled 1 minute after the second. Based on the expected temperature development, the expected measurement temperature was 1620°C, and the corresponding measurement profile defined an optimal average feed rate of 0.8 m / s and a duration of 0.54 s. The obtained measurement temperature was 1625°C.

[0224] List of icon numbers

[0225] 1, 1', 1”, 1”' Optical cored wire

[0226] 2', 2"', 2"' optical fibers

[0227] 3', 3"', 3"' metal tubes

[0228] 4”, 4”' Second metal tube

[0229] 5”, 5”’ in the gap between the metal tubes

[0230] 6 facilities

[0231] 7 Molten metal pool

[0232] 8 coils

[0233] 9. Opposite ends (the ends of the cored wire connected to the detector)

[0234] 10 detectors

[0235] 11. Containers; metallurgical containers

[0236] 12 feeders

[0237] 13 catheters

[0238] 14 entry points

[0239] 15. Tip of the optical cored wire

[0240] MB S Surface of molten metal pool

[0241] 17 Slag Layer

[0242] 18. Air Blowing Gun

[0243] 19. The portion of the cored wire immersed in the molten metal pool

[0244] L C Length of the cored wire immersed in the molten metal pool

[0245] 20. Sections of cored wire subjected to hot atmosphere and molten slag

[0246] 30 System

[0247] 40 devices

[0248] 50 modules

[0249] 60 storage units

[0250] 70 processing units

[0251] 80 Control Unit

Claims

1. A device for determining a series of at least two temperature values ​​T of a molten metal pool using an apparatus comprising a cored wire and a detector. mes (n) and T mes The method comprises (n+1) steps, the method including: (a) Provide the predicted temperature value T of the molten metal pool. pred The dataset associated with the corresponding measurement profile MP, Among them, the predicted temperature value T pred It is a temperature value not obtained through measurement, and The measurement profile is a sequence of steps that are performed to obtain the temperature of the molten metal pool. (b) Provide a model F(t) describing the temperature development of the molten metal pool over time; (c) Define the time step Δt; (d) Select a future time point t(n) and predict the temperature T of the molten metal pool at that time point t(n). pred (n); (e) From the predicted temperature value T pred The dataset selection provided, associated with the corresponding measurement profile MP, corresponds to the predicted temperature value T. pred The measurement profile MP(n) of (n); (f) Apply the measurement profile MP(n) at the time point t(n) to obtain the measured temperature value T. mes (n); (g) Based on the measured temperature value T mes (n), the model F(t), and the time step Δt are used to calculate the predicted temperature T of the molten metal pool. pred (n+1); (h) From the predicted temperature value T pred The dataset selection provided, associated with the corresponding measurement profile MP, corresponds to the predicted temperature value T. pred The measurement profile MP(n+1) of (n+1); (i) Apply the measurement profile MP(n+1) at time point t(n+1) to obtain the measured temperature value T. mes (n+1), where t(n+1) is defined as t(n+1)=t(n)+Δt.

2. The method according to claim 1, wherein the molten metal is molten steel.

3. The method according to claim 1 or 2, wherein the model F(t) describing the temperature development of the molten metal pool over time is a linear function.

4. The method of claim 1 or 2, wherein the model F(t) describing the temperature development is based on previous measurements.

5. The method according to claim 1 or 2, wherein the model F(t) describing the temperature development of the molten metal pool over time is based on operating parameters.

6. The method according to claim 1 or 2, wherein the model F(t) describing the temperature development of the molten metal pool over time is derived by a method comprising the following steps: (i) Provide a dataset that correlates the characteristics of a molten metal pool with recorded data on a model F(t) of the temperature development of the molten metal pool over time; (ii) Provide the characteristics of the molten metal pool; (iii) Receive the model F(t) corresponding to the characteristics of the molten metal pool from a provided dataset that correlates the characteristics of the molten metal pool with recorded data of the model F(t) relating the temperature development of the molten metal pool over time.

7. The method according to claim 1 or 2, wherein the duration of the time step Δt is derived by a method comprising the following steps: (i) Provide a dataset that correlates the operating parameters with the duration of time step Δt; (ii) Provide operating parameters; (iii) Receive the duration of the time step Δt from the provided dataset associated with the operating parameters.

8. The method according to claim 1 or 2, wherein the selection of the duration of the time step Δt is based on the measured temperature value T in step (f). mes (n).

9. The method of claim 1 or 2, wherein the measurement profile MP defines the following steps: (i) Providing the optical cored wire, wherein the tip of the optical cored wire is above the surface of the molten metal pool; (ii) During the time period from t0 to t2, at least one supply rate v fed The leading tip of the optical cored wire is supplied toward and below the surface of the molten metal pool, wherein the leading tip of the optical cored wire is below the surface of the molten metal pool during the time period from t1 to t2; (iii) Obtain temperature information during the measurement time period from t1 to t2; (iv) at a speed v ret The optical cored wire is retracted back to its position above the molten metal pool.

10. The method of claim 9, wherein the measurement profile MP is further defined as a step within a static time period from t1 to t2, during which the supply of the tip of the optical cored wire is paused, or the tip of the optical cored wire is supplied at a low speed.

11. The method of claim 9, wherein the supply in step (ii) of measuring the profile MP comprises at least two supply speeds v. fed 1 and v fed 2.

12. The method according to claim 1 or 2, wherein the supply speed v of the measured profile MP(n+1) fed (n+1) is a supply speed v higher than the measured profile MP(n). fed (n).

13. The method according to claim 1 or 2, wherein the duration of the time interval from t1 to t2 for measuring profile MP(n+1) is shorter than that for measuring profile MP(n).

14. The method according to claim 1 or 2, wherein supplying the model F(t) describing the temperature development of the molten metal pool over time in step (b) comprises steps (b1) to (b4): (b1) Limiting the predicted temperature T pred With the measured temperature value T mes The maximum temperature difference ΔT between max ; (b2) Limit the maximum temperature step size ΔT step ; (b3) The measured temperature value T mes (n) and the predicted temperature T pred The difference ΔT(n) between (n) and the maximum difference ΔT max Compare; (b4) Provide the model F(t), where if ΔT(n) is higher than the defined maximum temperature difference ΔT max ,but F(t)=T pred (n)+ΔT step 。 15. A series of at least two temperature values ​​T for determining a molten metal pool mes (n) and T mes A system of (n+1) elements, comprising devices and modules, wherein the modules are adapted to interact with the devices, wherein the devices include optical cored wire and a detector. The module includes a storage unit, a processing unit, and a control unit, wherein the storage unit includes: (a1) is used to provide the predicted temperature value T of the molten metal pool. pred Storage elements for the dataset associated with the corresponding measurement profile MP. Among them, the predicted temperature value T pred It is a temperature value not obtained by measurement, and the measurement profile is a sequence of steps performed to obtain the temperature of the molten metal pool; (a2) A storage element for supplying a model F(t) that describes the temperature development of the molten metal pool over time; (a3) Storage element used to define time step Δt; The processing unit includes: (b1) A method for selecting a future time point and predicting the temperature T of the molten metal pool at that future time point. pred Processing components; (b2) used to predict the temperature value T pred The dataset selection provided, associated with the corresponding measurement profile MP, corresponds to the predicted temperature T. pred The processing element for measuring the MP profile; (b3) Used for measurements based on temperature value T mes The predicted temperature T of the molten metal pool is calculated using the model F(t) and the time step Δt. pred Processing components, And the control unit mentioned therein includes: (c1) is used to apply the measurement profile MP at a certain point in time to obtain the measured temperature value T. mes The control element.

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