EP2244850B1 - Method of operation for a cooling track for cooling a rolling product, with cooling to an end enthalpy value uncoupled from temperature - Google Patents

Description

The present invention relates to an operating method for a cooling line for cooling a rolling stock.

The present invention further relates to a computer program comprising machine code, which is directly executable by a control device for a cooling line for cooling a rolling stock. The present invention also relates to a data carrier with such a computer program stored on the data carrier in machine-readable form.

Furthermore, the present invention relates to a control device for a cooling section for cooling a rolling stock.

Finally, the present invention relates to a cooling section for cooling a rolling stock, wherein the cooling section has a control device, of which the cooling section is operated.

The objects described above are well known.

Steel is rolled in a hot strip mill or heavy plate mill. In a subsequent cooling section, material properties of the steel are essentially set. For this purpose, a coolant is applied to the steel during the passage of the steel through the cooling section. As a result, the time course of cooling of the steel passing through the cooling section is adjusted. Due to the time course of the cooling process and the material properties are set.

The cooling process is usually determined by a temporal temperature profile. Older strategies prescribe a distribution of the coolant quantity according to a predetermined cooling strategy and a reel temperature or cooling end temperature (i.e., the temperature of the rolling stock at the outlet of the rolling stock from the cooling section). For normal steels, this procedure is easy. For steels with high carbon content, however, problems arise. Because due to the heat of transformation occurring during the phase transformation of austenite into ferrite and cementite, the specification of a temperature profile is unfavorable. In many cases, even only one final temperature to be achieved is specified in conjunction with a predetermined cooling strategy. This type of specification may even be ambiguous, i. H. There is more than one solution to the amount of water at which, given the cooling strategy, the reel temperature or end temperature is reached. However, the material properties of such differently cooled steels are fundamentally different from each other.

For steels with a high carbon content, therefore, fully automatic operation in the prior art is not possible. There are always difficulties encountered in the practice of fully automatically cooling steels with high carbon content. It happens again and again that material is generated that does not have the desired material properties. These materials must be melted down again.

In practice, attempts are made to circumvent the problems by attempting to avoid such materials and constraints. This reduces the producible spectrum of materials.

From the EP 1 732 716 B1 is an operating method for a cooling section for cooling a rolling stock, in which the input side of the cooling section, the temperature of the rolling stock is detected. It is determined a coolant flow rate, so that a Walzgutabschnitt at a predetermined point of Cooling section has a predetermined temperature and at least one predetermined phase portion (for example, austenite).

In the older German patent application 10 2007 007 560.1 dated 15.02.2007 an operating method for a cooling section for cooling a rolling stock is described in which, together with a temperature profile and a coolant flow rate, a phase portion of the rolling stock is determined and brought to an operator of the cooling section for display.

The German patent application 10 2007 007 560.1 is not pre-published on the priority date of the present invention.

The two last-described methods already represent an improvement over the rest of the prior art. However, they also do not work completely satisfactorily.

From the WO 2004/076085 A2 An operating method for a cooling line for cooling a rolling stock is known in which a control device for the cooling section receives information that is at least partially characteristic of an initial enthalpy value. In particular, the control device counteracts an initial temperature of the rolling stock. The control device continues to receive an end temperature. The control device determines a coolant flow rate, so that a Walzgutabschnitt a corresponding amount of heat is withdrawn. The control device determines the amount of coolant flow in such a way that at the end of the loading of the rolling stock with the coolant (if possible) the final temperature is reached. The control device acts on the rolling stock section during its passage through the cooling section in accordance with the determined coolant flow rate with the coolant. The WO 2004/076085 A2 also mentions that as an alternative or in addition to an actual or desired temperature profile, an actual or desired enthalpy course can be determined.

From the WO 03/045599 A1 an operating method for a finishing train is known, which is upstream of a cooling line. Within the cooling section, cooling devices can be arranged between the rolling stands of the finishing train. The finishing train can therefore be regarded as a cooling section in a broader sense. A control device for the finishing train receives an initial temperature. The initial temperature is usually complete for an initial enthalpy value, but at least partially characteristic. The control device is further given a desired temperature profile and thus also a final temperature value. The control device determines a coolant quantity course, so that a rolling stock section of the rolling stock (as a result) reaches the final temperature value after passing through the finishing train. The control device controls the finishing train. In this context, it (among other things) acts on the rolling stock section in accordance with the determined coolant flow rate. From the WO 03/045599 A1 It is also known to use the enthalpy as an alternative to the temperature. Further details can be found in the WO 03/045599 A1 Not.

The object of the present invention is to provide ways by which desired material properties of the rolling stock can be adjusted in a simple, reliable and accurate manner.

The object is procedurally achieved by an operating method with the features of claim 1. Advantageous embodiments of the operating method are the subject of the dependent claims 2 to 10.

According to the invention, a control device for the cooling line for an initial enthalpy value at least partially contrary to characteristic information. Furthermore, the control device accepts an end temperature value and at least one end phase proportion value. It determines a final enthalpy value. The control device determines a coolant flow rate, so that a rolling stock portion of the rolling stock is withdrawn during its passage through the cooling section corresponding to the difference of Anfangsenthalpiewert and Endenthalpiewert amount of heat. The control device determines the coolant flow rate here regardless of whether at the end of the loading of the rolling stock with a coolant, the final temperature value is reached. The control device acts upon the rolling stock section during its passage through the cooling section in accordance with the determined coolant flow rate with the coolant.

This procedure ensures that the enthalpy is adjusted as desired. As a result, the material properties of the rolling stock are essentially fixed.

• in dem Fall, dass der Phasenanteil im Laufe der Zeit abnimmt, oberhalb des Endphasenanteils liegt, und
• in dem Fall, dass der Phasenanteil im Laufe der Zeit zunimmt, unterhalb des Endphasenanteils liegt.

The coolant flow rate is preferably determined as a function of time. As a result of this procedure, the set material properties of the rolling stock are essentially independent of a speed with which the rolling stock passes through the cooling section. In a preferred embodiment of the present invention, the coolant flow rate further comprises an earlier period of time and a later period of time subsequent to the earlier period of time. During the earlier period, the rolling stock is actively cooled by the application of the coolant. During the later period of time, the rolling stock section only cools down passively without being exposed to the coolant. A time length of the earlier time period is determined such that at least one phase portion of the rolling stock at the end of the earlier time period

• in the case that the phase fraction decreases over time, is above the final phase component, and
• in the case that the phase proportion increases over time, is below the final phase content.

By doing so, it is achieved that not only the predetermined end enthalpy value is reached, but also that at the end enthalpy value the assigned final temperature value is reached.

In this context, it is particularly preferred that the length of the later time segment is determined in such a way that the phase fraction of the rolling stock at the beginning of the later time segment and the phase component of the rolling stock at the end of the later period segment the final phase fraction.

The information at least partially characteristic of the initial enthalpy value preferably includes an initial temperature value. In this case, it is possible in particular for a temperature measuring device arranged on the input side of the cooling section to detect the initial temperature value and for the control device to accept the starting temperature value from the temperature measuring device.

The initial enthalpy is generally completely determined only when, together with the initial temperature, at least one initial phase share value of the rolling stock is known. It is possible that the initial phase proportion value of the control device is fixed. Alternatively, the controller may accept the initial phase share value from an operator of the cooling line or an external device. It is also possible for the control device to determine the initial phase proportion value.

The control device preferably determines a temperature and / or an enthalpy curve of the rolling stock section. By this procedure, the coolant flow rate can be determined very accurately. Even better results are obtained if the control device is at least parallel to the determination of the temperature and / or enthalpy curve determines a phase share profile and the at least one determined phase share profile taken into account in the determination of the temperature and / or enthalpy curve.

On the basis of the determination of the temperature and / or enthalpy curve - possibly also the phase proportion profile - In particular, it is possible for the control device to determine at least one value based on at least one of the ascertained courses, which is a measure of the achievement of a desired state of the rolling stock during or after passing through the cooling track, and outputs this value to an operator of the cooling track. For example, the control device can determine and output the enthalpy at the end of the cooling section or the temperature at which a target conversion level is reached. In the latter case, a location and / or a point in time at which this temperature is reached may optionally be output.

Alternatively or additionally, the control device can determine a location or a point in time at which the rolling stock section has the final enthalpy value. This also makes it possible to draw conclusions about the quality of the cooled rolling stock.

In a preferred embodiment of the present invention, the predetermined Endenthalpiewert is based on a predetermined location of the cooling section or at a predetermined time. In this case, it is possible for the control device to compare the determined location with the predetermined location or the determined time with the predetermined time and to correct the coolant quantity course based on the comparison. An analogous approach is possible for other temperature or enthalpy values related to a predetermined location or a predetermined time.

Furthermore, it is possible to detect at predetermined points of the cooling section, the local temperature of the rolling stock and to compare with expected temperatures, which are determined on the basis of the previously determined course. Based on the comparison, in this case, the expected temperature, the coolant flow rate or the determination method for determining the temperature from the coolant flow rate can be adjusted.

Alternatively, it is possible that the predetermined Endenthalpiewert is related to neither a predetermined location of the cooling section nor to a predetermined time.

Programmatically, the object is achieved by a computer program, wherein the computer program comprises machine code, which is directly executable by a control device for a cooling line for cooling a rolling stock, the execution of the machine code by the control device causes the control device, the cooling section according to an operating method of the above explained type operates. Furthermore, the object is achieved programmatically by a data carrier on which such a computer program is stored in machine-readable form.

In terms of equipment, the object is achieved by a control device for a cooling section for cooling a rolling stock, wherein the control device is designed such that it operates the cooling section according to an operating method of the type described above. In this case, the control device can in particular be designed as a programmable control device which, during operation, executes a computer program of the type described above.

In terms of equipment, the object is finally achieved by a cooling section for cooling a rolling stock, wherein the cooling section has a control device of the type described above, so that the cooling section is operated by the control device according to an operating method according to the invention.

FIG 1

schematisch den Aufbau einer Kühlstrecke,

FIG 2

ein Ablaufdiagramm,

FIG 3

ein Zeitdiagramm und

FIG 4 bis 6

Ablaufdiagramme.

Further advantages and details will become apparent from the following description of exemplary embodiments in conjunction with the drawings. In a schematic representation:

FIG. 1

schematically the construction of a cooling section,

FIG. 2

a flow chart,

FIG. 3

a time chart and

FIGS. 4 to 6

Flowcharts.

According to FIG. 1 a cooling section 1 is usually downstream of a hot rolling mill. Shown here is in FIG. 1 only the last mill stand 2 of the hot rolling mill. The cooling section 1 is usually further downstream of a reel assembly 3.

The cooling section 1 has a roller table 4, in which a rolled out of the rolling mill rolling stock 5 with a liquid coolant 6 (usually water with or without additives) is applied. The cooling section 1 has for this purpose a plurality of coolant outlets 7, which can be controlled individually or in groups by a control device 8 for the cooling section 1. In this case, the control device 8 controls the entire cooling path 1, that is to say not only the coolant outlets 7, but also, for example, the cooling of rollers of the roller table 4.

The control device 8 is generally designed as a programmable control device 8, which executes a computer program 9 during operation. The computer program 9 in this case comprises machine code 10, which is directly executable by the control device 8. In this case, the execution of the machine code 10 causes the control device 8 to operate the cooling section 1 in accordance with an operating method according to the invention.

The computer program 9 may already have been deposited in the control device 8 during the production of the control device 8. Alternatively, it is possible to supply the computer program 9 to the control device 8 via a computer-computer connection. The calculator-computer connection is in FIG. 1 not shown here. It can be designed, for example, as a connection to a LAN or to the Internet. Again alternatively, it is possible to store the computer program 9 on a data carrier 11 in machine-readable form and the computer program 9 of the control device 8 via the To feed data carrier 11. The design of the data carrier 11 is arbitrary nature. For example, it is possible that the data carrier 11 is designed as a USB memory stick or as a memory card. Is shown in FIG. 1 an embodiment of the data carrier 11 as a CD-ROM.

The caused by the controller 8 operating method for the cooling section 1 will be in connection with FIG. 2 explained in more detail. It should be noted in advance that the operating procedure according to FIG. 2 online, clocked and carried out under tracking of the rolling stock 5. The procedure of FIG. 2 is therefore performed for each tracked portion 12 of the rolling stock 5.

In a step S1, the control device 8 receives information TA, which is at least partially characteristic of an initial enthalpy value EA of the rolling stock section 12. As a rule, the information TA which is at least partially characteristic of the initial enthalpy value EA in this case comprises an initial temperature value TA.

The initial temperature value TA can in principle be supplied to the control device 8 in any desired manner. As a rule - see FIG. 1 - On the input side of the cooling section 1, a temperature measuring device 13 is arranged, which detects the initial temperature value TA and the control device 8 feeds. The control device 8 therefore takes in this embodiment, the initial temperature value TA from the temperature measuring device 13.

Due to the initial temperature TA alone, the initial enthalpy EA is often not yet clearly determined. In general, the initial enthalpy EA is additionally dependent on at least one initial phase fraction value pA. For example, the initial phase share value pA may be characteristic of the proportion of austenite in the rolling stock 5 or in the considered section 12 of the rolling stock 5. Alternatively or additionally For example, be given an initial phase share value pA for the proportion of ferrite or cementite.

In a step S2, the control unit 8 determines the initial enthalpy EA on the basis of the initial temperature value TA and the initial phase proportion value pA. The initial phase component value pA can in this case be predefined for the control device 8. Alternatively it is possible - see FIG. 1 - That the control device 8 receives the initial phase share value pA from an operator 14 of the cooling section 1 or an external device 15. In the case of the external device 15, this may alternatively be a control device for the upstream hot rolling train or a superordinate control device. Again alternatively, it is possible that the control device 8 automatically determines the initial phase proportion value pA.

In a step S3, the control device 8 determines a coolant flow rate K. The control device 8 determines the coolant flow K in such a way that the Walzgutabschnitt 12 of the rolling stock 5 is withdrawn during its passage through the cooling section 1, an amount of heat with the difference of the Anfangsenthalpiewerts EA of a predetermined Endenthalpiewert EE corresponds. The coolant flow rate K is here - see FIG. 3 - usually a function of time t. However, it is alternatively possible to determine the coolant flow rate K as a function of the location x in the cooling section 1.

The Endenthalpiewert EE is - at least in the rule - assigned a predetermined final temperature value TE (see the following statements in conjunction with FIG. 4 ). The control device 8 determines the coolant flow rate K, however, regardless of whether at the end of the loading of the rolling stock 5 with the coolant K of the Endenthalpiewert EE associated end temperature value TE is reached. It is only considered whether the final enthalpy EE is reached as such.

In a step S4, the control device 8 acts on the rolling stock section 12 during its passage through the cooling section 1 in accordance with the determined coolant flow rate K with the coolant 6. The corresponding pressurization is readily possible because the rolled section 12 is tracked through the cooling section 1 during its passage ,

How out FIG. 3 can be seen, the coolant flow rate K has an earlier period of time 16 and a later period of time 17. The later period 17 in this case immediately follows the earlier period 16. During the earlier time period 16, the rolling stock section 12 is actively cooled by the application of the coolant 6. During the later period of time 17, the rolling stock section 12 only cools down passively. An application of the coolant 6 is not carried out during the later period of time 17.

The earlier period 16 has a time length t1. The time length t1 is determined to be smaller than a characteristic time constant t2 within which a phase transformation of the rolling stock 5 occurs, for example from austenitic steel to ferritic steel. This ensures that at the end of the earlier period 16, the phase transformation of the rolling stock 5 is done only to a small extent. The extent to which the phase transformation has taken place here depends on the time length t1. Accordingly, it is possible, for example in the case of a rolling stock 5 made of steel, to ensure that at the end of the earlier period 16 the proportion of austenite in the rolling stock 5 is above a desired phase portion or conversely the ferrite portion is below a desired phase portion, etc. In general, it can be achieved at least one phase portion of the rolling stock portion 12 at the end of the earlier period 16 satisfies a predetermined condition.

In the later period 17, the enthalpy E of the respective rolling stock section 12 decreases. On the other hand, the decrease in the enthalpy E takes place considerably more slowly than in the earlier period of time 16. It can be regarded as substantially constant during the later time interval 17.

• die Enthalpie E des Walzgutabschnitts 12 zumindest in etwa gleich dem Endenthalpiewert EE ist,
• der Phasenanteil p der betrachteten Phase des Walzguts 5 den Sollphasenanteil annimmt und folglich
• zu diesem Zeitpunkt t bzw. an diesem Ort x der Kühlstrecke 1 die Temperatur T des Walzguts 5 gleich der Endtemperatur TE ist.

In the later period 17, the phase transformation of the rolling stock 5, for example from austenite to ferrite and / or cementite takes place. If the later period 17 is long enough, the Austenitanteil usually drops to zero. In any case, however, the later period of time 17 should be long enough that the phase fraction p of the rolling stock 5 at the end of the later period 17 and the phase portion p of the rolling stock 5 at the beginning of the earlier period 17 (ie at the end of the earlier period 16) the target phase proportion straddle. Regardless of at what point in time t and at which point x the desired phase component is reached, there therefore exists a point in time t or a point x, to which

• the enthalpy E of the rolling stock section 12 is at least approximately equal to the end enthalpy value EE,
• the phase component p of the considered phase of the rolling stock 5 assumes the desired phase component and consequently
• At this time t or at this location x of the cooling section 1, the temperature T of the rolling stock 5 is equal to the final temperature TE.

If the later period of time 17 is sufficiently long so that the desired phase component is reliably embedded by the phase component p at the beginning and at the end of the later period 17, a further period may follow the later period 17, in which the rolling stock section 12 again the coolant 6 is acted upon. The further period is in FIG. 3 not shown.

As already mentioned, the end enthalpy value EE must be given. It is possible that the Endenthalpiewert EE of the control device 8 is fixed. However, it is preferable the end enthalpy value EE or the information TE, pE characteristic of the end enthalpy value EE are specified to the control device 8, the control device 8 therefore receives the corresponding values TE, pE. In this case, it is possible for the control device 8 to specify the end enthalpy value EE as such directly. However, it is preferable, accordingly FIG. 4 the step S1 of FIG. 2 Pre-arrange steps S6 and S7. In step S6, the controller receives the final temperature value TE and an end phase component pE. The final temperature value TE and the final phase proportion value pE completely characterize the state of the rolling stock 5. It is therefore possible to determine the end enthalpy value EE in step S7 on the basis of the values TE and pE. If predetermined, the final phase component value pE corresponds to the above-mentioned desired phase component.

Already the procedure described above is executable. It does not lead to an optimal result, but already leads to very good results. In particular, it leads to reproducible results.

In a preferred embodiment of the present invention, the step S3 of FIG. 2 corresponding FIG. 5 modified.

According to FIG. 5 determines the controller 8 first in step S3, the coolant flow rate K.

In a step S11, the control device 8 determines, for example, using a cooling line model known per se (compare, for example, FIG DE 101 29 565 A1 ) - a temperature profile T, which results in the determined in step S3 coolant flow rate K. As an alternative to determining the temperature profile T, a corresponding enthalpy curve E could be determined in step S11. The determined course T, E can hereby alternatively be a function of the location x or a function of the time t. The determined course T, E is preferably a function of the time t.

It is possible, starting from step S11, to proceed directly to step S4 and to apply the rolling stock section 12 with the coolant 6 in accordance with the determined coolant flow rate K. In a preferred embodiment of the present invention, however, at least one step S12 is present. In step S12, the control device 8 uses the determined temperature or enthalpy curve T, E to determine a location x 'or a point in time t' at which the considered rolling stock section 12 has the end enthalpy value EE. The location x 'is determined here if the determined course T, E is a function of the location x, the time t', if the determined course T, E is a function of time t.

It is possible, in a subsequent to the step S12, in FIG. 5 not shown step to output only the determined location x 'and the determined time t' to the operator 14 and wait for its reaction. This procedure is particularly useful when the predetermined Endenthalpiewert EE is related neither to a predetermined location of the cooling section 1 nor to a predetermined time. As a rule, however, the predetermined final enthalpy value EE is related to a predetermined location x "of the cooling section 1 or to a predetermined point in time t". The predetermined location x "may be, for example, the location of the reel assembly 3. The predetermined time t" may, for example, be a predetermined number of seconds after the rolling stock 12 has reached the cooling section 1.

When the end enthalpy value EE is related to the predetermined location x "and the predetermined time t", respectively, steps S13 to S15 are preferably provided. In step S13, the control device 8 compares the determined location x 'with the predetermined location x "and the determined time t' with the predetermined time t". Based on the comparison, the controller 8 determines the value of a logical variable OK in step S13. For example, the logical variable OK may take the value "TRUE" if and only if an (possibly signed) deviation of the predetermined location x "from the determined location x 'is within a predetermined tolerance range, analogously it is of course possible to proceed when comparing the determined time t' and the predetermined time t". In step S14, the controller 8 checks the value of the logical variable OK. If the logical variable OK is "TRUE", the controller 8 proceeds to step S4. Otherwise, the control device 8 carries out the step S15 in which it modifies the coolant flow rate K.

In the context of FIG. 5 only the temperature or the enthalpy T, E is determined. The procedure of FIG. 5 can according to FIG. 6 be further improved by the step S11 is replaced by a step S16. In step S16, the control device 8 determines the temperature or enthalpy profile T, E of the respective rolling stock section 12 analogously to step S11. However, in step S16 the control device 8 determines at least one phase-share profile p. When determining the temperature or enthalpy profile T, E, the control device 8 takes into account the determined phase component profile p and vice versa.

The procedure of step S16 is well known to those skilled in the art. Purely by way of example is to the already mentioned DE 101 29 565 A1 directed.

The present invention has many advantages. For example, it is very easy to implement because the model of the cooling section 1 can be kept very rudimentary. Solving a complicated heat equation (possibly including a phase transformation equation) is not mandatory. Nevertheless, there are good and above all reproducible control procedures. The operating method always leads to a clear coolant flow rate K and thus solves in particular all problems, which occur in carbon-rich steels in the prior art.

A further advantage of the present invention is that the exact location at which the end enthalpy value EE is reached does not necessarily have to be calculated (although this is advantageous). Furthermore, the location does not have to be calculated or fulfilled at which the rolling stock 5 assumes the end temperature value TE associated with the end enthalpy EE. Because after completion of the active cooling (in the earlier period of time 16), the enthalpy E of the considered rolling stock section 12 remains essentially constant, so that the considered rolling stock section 12 reaches the final temperature TE at any time and therefore also at any location.

A further advantage of the present invention is that the operator 14 does not have to specify the end enthalpy EE directly but can specify the values end temperature TE and final phase value pE which are familiar to him.

The above description is only for explanation of the present invention. The scope of the present invention, however, is intended to be determined solely by the appended claims.

Claims (15)

1. Operating method for a cooling section (1) for cooling a rolling stock (5),

   - wherein a control device (8) for the cooling section (1) receives information (TA) which is at least partially characteristic for an initial enthalpy value (EA),

   - wherein the control device (8) receives a final temperature value (TE) and at least one final phase proportion value (pE) and determines a final enthalpy value (EE) therefrom,

   - wherein the control device (8) determines a quantitative coolant profile (K) such that a heat quantity corresponding to the difference between the initial enthalpy value (EA) and final enthalpy value (EE) is taken from a rolling stock section (12) of the rolling stock (5) as it passes through the cooling section (1),

   - wherein the control device (8) determines the quantitative coolant profile (K) irrespective of whether the final temperature value (TE) is reached at the end of the application of a coolant (6) to the rolling stock (5),

   - wherein the control device (8) applies the coolant (6) to the rolling stock section (12) as it passes through the cooling section (1) in accordance with the determined quantitative coolant profile (K).
2. Operating method according to Claim 1,
   characterized

   - in that the quantitative coolant profile (K) is determined as a function of the time (t),

   - in that the quantitative coolant profile (K) has an earlier time segment (16) and a later time segment (17) which immediately follows the earlier time segment (16),

   - in that the rolling stock section (12) is actively cooled during the earlier time segment (16) by the application of the coolant (6), and only cools passively during the later time segment (17) without application of the coolant (6), and

   - in that a temporal length (t1) of the earlier time segment (16) is determined in such a manner that at least one phase proportion (p) of the rolling stock section (12), at the end of the earlier time segment (16), lies above the final phase proportion if the phase proportion (p) decreases over time, and lies below the final phase proportion if the phase proportion (p) increases over time.
3. Operating method according to Claim 2,
   characterized in that the length of the later time segment (17) is determined in such a manner that the phase proportion (p) of the rolling stock (5) at the start of the later time segment (17) and the phase proportion (p) of the rolling stock (5) at the end of the later time segment (17) encompass the final phase proportion.
4. Operating method according to Claim 1, 2 or 3,
   characterized in that the information (TA) which is at least partially characteristic for the initial enthalpy value (EA) comprises an initial temperature value (TA).
5. Operating method according to one of the preceding claims,
   characterized in that an initial phase proportion value (pA) is permanently predefined to the control device (8), or in that the control device (8) receives the initial phase proportion value (pA) from an operator (14) of the cooling section (1) or from an external device (15), or in that the control device (8) determines the initial phase proportion value (pA).
6. Operating method according to one of Claims 1 to 5,
   characterized in that the control device (8) determines a temperature and/or an enthalpy profile (T, E) of the rolling stock section (12).
7. Operating method according to Claim 6,
   characterized in that the control device (8) determines the temperature and/or enthalpy profile (T, E) and at least one phase proportion profile (p) in parallel, and takes the at least one determined phase proportion profile (p) into account when determining the temperature and/or enthalpy profile (T, E) .
8. Operating method according to Claim 6 or 7,
   characterized in that the control device (8) uses the determined temperature and/or enthalpy profile (T, E) to determine a site (x') or a point in time (t') at which the rolling stock section (12) has the final enthalpy value (EE).
9. Operating method according to Claim 8,
   characterized in that the predetermined final enthalpy value (EE) is related to a predetermined site (x'') of the cooling section (1) or to a predetermined point in time (t''), in that the control device (8) compares the determined site (x') with the predetermined site (x'') or the determined point in time (t') with the predetermined point in time (t''), and in that the control device (8) uses the comparison to correct the quantitative coolant profile (K).
10. Operating method according to one of Claims 1 to 8,
    characterized in that the predetermined final enthalpy value (EE) is related neither to a predetermined site of the cooling section (1) nor to a predetermined point in time.
11. Computer program, the computer program comprising machine code (10) which can be executed directly by a control device (8) for a cooling section (1) for cooling a rolling stock (5), the execution of the machine code (10) by the control device (8) having the effect that the control device (8) operates the cooling section (1) in accordance with an operating method according to one of the preceding claims.
12. Data storage medium having a computer program (9) according to Claim 11 which is stored on the data storage medium in machine-readable form.
13. Control device for a cooling section (1) for cooling a rolling stock (5), the control device being designed in such a manner that it operates the cooling section (1) in accordance with an operating method according to one of Claims 1 to 10.
14. Control device according to Claim 13,
    characterized in that it is in the form of a programmable control device which, during operation, executes a computer program (9) according to Claim 12.
15. Cooling section for cooling a rolling stock (5), the cooling section having a control device (8) according to Claim 13 or 14, such that the cooling section is operated by the control device (8) in accordance with an operating method according to one of Claims 1 to 10.

Images