WO2021209251A1 - Betrieb einer kühleinrichtung mit einem minimalen arbeitsdruck - Google Patents
Betrieb einer kühleinrichtung mit einem minimalen arbeitsdruck Download PDFInfo
- Publication number
- WO2021209251A1 WO2021209251A1 PCT/EP2021/058174 EP2021058174W WO2021209251A1 WO 2021209251 A1 WO2021209251 A1 WO 2021209251A1 EP 2021058174 W EP2021058174 W EP 2021058174W WO 2021209251 A1 WO2021209251 A1 WO 2021209251A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- control
- pump arrangement
- control device
- working pressure
- cooling
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
- B21B37/76—Cooling control on the run-out table
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
Definitions
- the present invention is based on a Melverfah ren for a cooling device for cooling a hot rolling stock made of metal,
- cooling device has a collecting line into which a liquid coolant is fed via a pump arrangement and from which a plurality of branch lines to application devices branch off,
- the pump arrangement has a number of pumps, a control valve is arranged in each of the branch lines and the coolant is applied to the rolling stock by means of at least some of the application devices,
- the control device controls the pump arrangement according to a final control state and the control valves according to control values.
- the present invention is further based on a computer program which comprises machine code, which can be processed by a control device of a cooling device for cooling a hot rolling stock made of metal, the processing of the machine code by the control device causing the control device to control the cooling device according to one of these operating procedures.
- the present invention is also based on a control device of a cooling device for cooling a hot rolling stock made of metal, the control device having a such a computer program is programmed so that the control device operates the cooling device according to such an operating method.
- the present invention is also based on a cooling device for cooling a hot rolled stock made of metal,
- the cooling device has a collecting line, a pump arrangement and a plurality of application devices,
- the application devices are connected to the collecting line via a respective branch line,
- the pump arrangement has a number of pumps by means of which the liquid coolant is fed into the collecting line
- a control valve is arranged in each of the branch lines,
- cooling device has such a control device which operates the cooling device according to such an operating method.
- a cooling device for cooling a hot rolled stock made of metal in which a liquid coolant is fed into a collecting line via a pump arrangement, from which branch lines lead to application devices, by means of which the coolant is applied to the rolling stock.
- Control valves are arranged in the branch lines.
- the control device uses its known setpoint currents to be fed to the application devices to determine a control state for the pump arrangement and control values for the control valves and controls the pump arrangement and the control valves. responsive to.
- the collecting line is either under high pressure or under low pressure.
- the higher pressure of the coolant is only generated when it is actually needed.
- the need for high pressure is considered to be given if, at low pressure, the opening position of at least one valve would exceed a certain opening position specified as a limit value.
- WO 2014/124867 A1 also discloses a cooling device for cooling a hot rolled stock made of metal, in which a pump arrangement feeds a liquid coolant into a collecting line, from which branch lines lead to application devices, by means of which the coolant is applied to the rolling stock .
- Control valves are arranged in the branch lines.
- a control device of thedeein direction are known target currents that are to be fed to the Aufbringeinrich lines.
- the control device determines corresponding control values of the control valves and controls them in this way.
- WO 2014/124868 A1 also discloses a cooling device for cooling a hot rolled stock made of metal, in which a liquid coolant is fed into a collecting line via a pump arrangement, from which branch lines lead to application devices by means of which the coolant is applied to the rolling stock .
- Control valves are arranged in the branch lines.
- a control device of the cooling device uses setpoint currents to be fed to the application devices to determine a total current and, on the basis of the total current, a control state of the pump configuration.
- the working pressure in the collecting line can be set between a minimum value and a maximum value.
- the control valves can be set between fully closed and fully open positions. To set the individual target currents, the control device varies both the opening positions of the valves and the line pressure that the pump generates in the manifold.
- a cooling device for cooling a hot rolled stock made of metal in which a liquid coolant is fed into a collecting line via a pump arrangement, from which branch lines lead to application devices, by means of which the coolant is applied to the rolling stock .
- Control valves are arranged in the branch lines.
- a control device determines a control state for the pump arrangement as a function of the setpoint currents that are to be supplied to the application devices. In addition to the total amount of water to be carried, the control device takes into account a change in the amount of water and a line resistance. If the opening positions of the control valves fall below minimum distances from a minimum possible open position and a maximum possible open position, the control state of the Pum pe and thus also the working pressure are adapted.
- a cooling device for ku len a hot rolling stock made of metal is known, in which a liquid coolant is applied to the rolling stock by means of several application devices.
- the application devices who are each fed by their own pump. Valves between the respective pump and the respective application device are continuously kept ge in a fully open state. The setting of the pumped amounts of coolant takes place exclusively through appropriate time-variable control of the pumps.
- control valves are fed via pumps.
- a typical arrangement is a supply of several control valves via a collecting line, the Sam mel Arthur being supplied with coolant by a pump arrangement will.
- the pump arrangement can have one pump or also several pumps.
- the coolant is applied to the rolling stock by means of the application devices (these are often designed as spray bars).
- additional applicators may be present that do not apply the coolant to the rolling stock, but instead deliver the coolant in some other way. This can be useful, for example, to equalize the amount of coolant that is conveyed overall.
- the object of the present invention is to create possibilites by means of which a conventional cooling device - that is, a cooling device in which the metering of the coolant applied to the rolling stock takes place via the control of control valves - can be operated in an improved manner.
- an operating method of the type mentioned at the beginning is designed in that the control device for determining the final control state of the pump arrangement and the control values of the control valves
- a respective individual working pressure is determined that must prevail in the collecting line so that the respective target current flows in the respective branch line
- a preliminary control state of the pump arrangement he averages, so that the collecting line by means of the pump arrangement a total flow of coolant is supplied, which corresponds to the sum of the target currents, and at the same time in the collecting line there is a preliminary working pressure that is at least as great as the greatest of the individual working pressures,
- the final control state of the pump arrangement is determined using the preliminary control state of the pump arrangement in such a way that the total flow of coolant is fed to the collecting line by means of the pump arrangement and at the same time there is a final working pressure in the collecting line, and
- the activation values of the control valves are determined using the final working pressure in such a way that the respective target current flows in the respective branch line.
- the limit modulations of the control valves are the maximum modulations of the control valves.
- the limit modulations of the control valves are slightly below this, i.e. are only in the vicinity of the maximum modulations of the control valves.
- the limit modulations of the control valves al so correspond to a high percentage of the maximum modulations of the control valves, for example 80%, 90% or 95%.
- the limit modulations can also have other values. In particular, a value of 80% should not be undercut.
- the figures also relate to the coolant flows, i.e. the effect resulting from the activation of the respective control valve.
- control device takes into account secondary conditions related to the Pum pen arrangement within the scope of the determination of the preliminary control state. This can ensure that the pump arrangement is always operated in a permissible operating range.
- the control device can, for example, check whether it can determine a permissible control state of the pump arrangement in which the pump arrangement on the one hand promotes the required total flow and on the other causes the largest of the individual working pressures determined in the collecting line. If this is the case, this working pressure or a value derived directly from this working pressure can be used as the final working pressure. If this is not the case, the control device can gradually increase the working pressure, starting from the preliminary working pressure, until a permissible control state of the pump arrangement is found.
- the control device preferably takes into account secondary conditions related to the control valves in the course of determining the preliminary control state.
- the control device can, for example, determine the associated control values of the control valves for a permissible control state of the pump arrangement which, on the one hand, promotes the required total flow and, on the other hand, causes a working pressure in the collecting line that is at least as large as the largest of the individual working pressures check whether and, if so, to what extent undesirable conditions occur. If this is the case, either the undesired states can be accepted or the control state can be adapted to the pump configuration. Which measure is taken can be decided depending on the situation of the individual case.
- the control device preferably also takes into account at least one previous final control state of the pump arrangement and / or at least one preliminary control state of the pump arrangement expected in the future.
- the control device can be a mo- Carry out a dell-predictive determination of the preliminary control state.
- the control device can also, for example, set an optimization problem into which, on the one hand, the minimization of the preliminary working pressure according to the invention is included and, on the other hand, further facts are included. Examples of such circumstances are a change in the preliminary or the final working pressure and a change in the control status of the pump arrangement.
- the object is also achieved by a computer program with the features of claim 6.
- the processing of the computer program has the effect that the control device operates the cooling device according to an operating method according to the invention.
- control device having the features of claim 7.
- the control device is programmed with a computer program according to the invention, so that the control device operates the cooling device according to an operating method according to the invention.
- a cooling device for cooling hot rolled metal with the features of claim 8.
- a cooling device of the type mentioned at the outset has a control device according to the invention which operates the cooling device according to an operating method according to the invention.
- FIG. 2 shows a characteristic curve of a control valve
- a rolling line has at least one rolling stand 1. Only a single roll stand 1 is shown in FIG. 1. In many cases, however, there are several roll stands 1 arranged one behind the other, so that the rolling line is designed as a rolling train.
- a hot rolling stock 2 is rolled, i.e. its cross-section is reduced.
- the rolling stock 2 can consist of steel or aluminum, for example. But it can also consist of another metal, for example brass or copper.
- the rolling stock 2 can be a flat rolling stock, for example a strip or a heavy plate. However, it can also have a different shape, for example, it can be in the form of a rod or a profile or a tube.
- the rolling line also has a cooling device 3.
- the cooling device 3 is arranged downstream of the roll stand 1 as shown in FIG. However, this is not absolutely necessary.
- the cooling device 3 could also be arranged upstream of the Walzge stand 1, for example in the form of a so-called intermediate stand cooling between the finishing stands egg ner multi-stand finishing train or be arranged in the form of a pre-strip cooling between the first finishing stand of a multi-stand finishing train and a roughing stand. Other arrangements are also possible.
- the cooling device 3 has a collecting line 4.
- a liquid coolant 6 is fed into the collecting line 4 via a pump arrangement 5.
- the pump pen arrangement 5 be connected on the input side with a Re reservoir 7 for this purpose.
- other configurations are also possible, for example a direct supply of the pump arrangement 5 via a water distribution network.
- the Pum pen arrangement 5 can have a plurality of pumps 8 as shown in FIG.
- the pumps 8 are connected in parallel to one another in the configuration shown in FIG.
- the pumps 8 could, however, also be arranged in series one behind the other. Combinations of this procedure are also possible, for example three lines in which two pumps 8 are arranged in series one behind the other. It is also possible that only a single pump 8 is present.
- the coolant 6 is mostly water or consists at least essentially (98% and more) of water.
- branch lines 9a to 9d go to application devices 10a to 10d.
- the application devices 10a to 10d are therefore connected to the collecting line 4 via the branch lines 9a to 9d.
- the coolant 6 is applied to the rolling stock 2 by means of the application devices 10a to 10d.
- the application devices 10a to 10d can be designed, for example, as so-called cooling bars or spray bars.
- the application devices 10a to 10d are arranged above the rolling stock 2 as shown in FIG. 1 and consequently apply the coolant 6 to the rolling stock 2 from above. However, this is not absolutely necessary.
- the bringing devices 10a to 10d could also be arranged below the rolling stock 2 or be arranged elsewhere. It is also possible for the application devices 10a to 10d to apply the coolant 6 to the rolling stock 2 from different sides. It is also possible that not all application devices 10a to 10d apply the coolant 6 to the rolling stock 2, but rather at least one - if, then usually one or two - of the application devices 10a to 10d does not apply the coolant 6 to the rolling stock 2. Corresponding Corresponding configurations and the reasons for this are explained, for example, in the aforementioned WO 2019/115145 A1.
- FIG. 10 a total of four application devices 10a to 10d are shown in FIG.
- the present invention is explained in connection with this number of application devices 10a to 10d.
- the number of application devices 10a to 10d could, however, also be larger or smaller. It just has to be greater than 1.
- At least two application devices 10a to 10d are present, which are connected to the collecting line 4 via two branch lines 9a to 9d, where a control valve 11a to 11d is arranged in each of the branch lines 9a to 9d.
- Control valves 11a to 11d are arranged in the branch lines 9a to 9d.
- the control valves 11a to 11d can be designed as ball valves, for example. Regardless of their specific design, the control valves 11a to 11d can, however, be adjusted continuously.
- the term “continuously adjust” is explained below with reference to the illustration in FIG. 2 for the control valve 11a. Analogous statements apply to the other control valves 11b to 11d.
- the control valve 11a is activated with an activation value Aa.
- the activation value Aa lies between a minimal activation value Amin and a maximum activation value Amax.
- the control value Aa can be varied continuously or at least in several stages.
- the control value Aa can therefore - possibly within the scope of a setting accuracy - assume several possible values between the minimum control value Amin and the maximum control value Amax.
- the minimum control value Amin and the maximum control value Amax can be 0 ° and 90 ° and the control value Aa can be set in steps of 0.1 ° or 0.2 ° between these two extreme values Amin, Amax .
- a corresponding reference coolant flow KR flows through the control valve 11a and thus through the corresponding branch line 9a. Due to the possibility of continuously adjusting the control valve 11a, the reference coolant flow KR also runs through a corresponding value continuum between a minimum value KRmin (mostly 0) and a maximum value KRmax (which is of course greater than the minimum value KRmin).
- the reference coolant flow KR divided by the maximum value KRmax corresponds to a modulation ka of the control valve 11a.
- the modulation ka has a maximum value of 1 and usually a minimum value of 0.
- the functional relationship of the reference coolant flow KR (or hereby equivalent to the modulation ka) as a function of the control value Aa corresponds to a characteristic curve for the control valve 11a.
- the characteristic curve is often non-linear.
- the actual coolant flow Ka - i.e. the amount of coolant 6 actually flowing through the control valve 11a - can easily be determined for a given control value Aa, provided that the working pressure pA present on the input side of the control valve 11a is known.
- the value that results from the characteristic curve itself only needs to be scaled with the square root of the quotient of working pressure pA and reference pressure pR.
- the working pressure pA and the reference pressure pR may have to be corrected by an offset.
- the coolant flow Ka zu results is the density of the coolant 6, g the acceleration due to gravity, ha is the height of the valve outlet (or the applicator device 10a) relative to a reference level that is uniform for the applicator devices 10a to 10d.
- hA can - depending on the arrangement of the valve outlet relative to the reference level - be greater or less than 0.
- the reference level can be selected as required. It can, for example, correspond to the level of a roller table by means of which the rolling stock 2 is conveyed through the cooling device 3.
- the associated activation value Aa results directly from the characteristic curve after the modulation ka has been determined.
- the cooling device 3 also has a control device 12 which controls and operates the cooling device 3.
- the control device 12 is generally designed as a software-programmable device. This is indicated in FIG. 1 by the fact that the symbol “mR” for microprocessor is drawn within the control device 12.
- the control device 12 is programmed with a computer program 13.
- the computer program 13 comprises machine code 14 which can be processed by the control device 12. Due to the programming with the computer program 13 or the processing of the machine code 14, the control device 12 operates the cooling device 3 according to an operating method which is explained in more detail below in connection with FIG.
- the control device 12 setpoint currents Ka * to Kd * are known.
- the target currents Ka * to Kd * indicate - for example in liters per second - the amounts of coolant 6 that are to be supplied to the respective application device 10a to 10d and delivered by the respective application device 10a to 10d, in particular applied to the rolling stock 2 should.
- the target currents Ka * to Kd * of the control device 12 can be specified externally or can be determined independently by the control device 12 on the basis of other conditions. Appropriate procedures are generally known to those skilled in the art.
- the control device 12 determines an individual working pressure pAa for a limit modulation value kLim of the control valve 11a.
- the limit modulation value kLim is specified for the control device 12.
- the limit modulation value kLim can be the maximum modulation of the control valve 11a. In many cases, however, it is of some advantage if, as shown in FIG. 2, it is a value that is close to but below the maximum modulation of the control valve 11a.
- the limit modulation value kLim should be at least 80%, preferably at least 90%, particularly preferably at least 95%. As a rule, however, a value of 98% should not be exceeded.
- the limit modulation kLim thus corresponds to a high percentage of the maximum modulation of the control valve 11a. For the sake of good order, it should be made clear that the limit modulation value kLim relates to the control ka of the control valve 11a, not to the control Aa of the control valve 11a.
- the control device 12 determines the individual working pressure pAa in such a way that the desired setpoint current Ka * flows in the branch line 9a at the working pressure pAa and the limit modulation kLim of the control valve 11a.
- the control device 12 determines the working pressure pAa, for example, according to the equation
- the control device 12 determines, in a completely analogous manner, individual working pressures pAb to pAd for the other control valves 11b to 11d.
- the limit modulation kLim, the maximum reference coolant flow KRmax and the reference pressure pR of the other control valves 11b to lld can have the same values as the limit modulation kLim, the maximum reference coolant flow KRmax and the reference pressure pR of the control valve 11a. Alternatively, it can be about other values, which may also be within the others
- Control valves 11b to lld can vary from control valve 11b to lld to control valve 11b to lld. In any case, however, the control device 12 determines the individual working pressures pAb to pAd of the other control valves 11b to lld independently of one another and also independently of the individual working pressure pAa of the control valve 11a.
- the control device 12 determines a control state Z of the pump arrangement 5.
- the control state Z is determined in such a way that the pump arrangement 5 - provided it is operated in accordance with the control state Z - delivers a total current K which is the sum of the setpoint currents Ka * until Kd * corresponds. Due to the conveyance of the total flow K, the collecting line 4 is also supplied with the total flow K of coolant 6 by means of the pump arrangement 5.
- the control state Z is determined in such a way that there is a working pressure pAv in the collecting line 4 which is at least as great as the greatest of the individual working pressures pAa to pAd. However, both the control state Z and the working pressure pAv are only provisional.
- the control state Z includes at least for each pump 8 of the pump arrangement 5, the neces sary speed n.
- control of the pump arrangement 5 can be changed continuously or at least in several stages. It is not only possible to switch between two or three fixed, discrete control states Z, but the possible control states Z form a continuum or a quasi-continuum.
- one of the pumps 8 can be operated between a minimum speed nmin of 100 revolutions / min and a maximum speed nmax of 800 revolutions / min
- the speed n can also be set to intermediate values between 100 revolutions / min and 800 revolutions / min can be set, for example in the case of a stepless setting 150 revolutions / min, 227 revolutions / min or 593 revolutions / min and in the case of a stepless setting to at least 10 different levels of for example 100, 150, 200, 250 etc. up to 800 revolutions / min.
- the numerical values mentioned are of course only to be understood as examples.
- control device 12 only takes into account the pressure to be statically generated by the pump arrangement 5 in the context of step S4. It is therefore possible that the control device 12 assumes in the context of step S4 that the pressure generated on the output side of the pump arrangement 8 corresponds to the pressure on the input side of the control valves 11a to 11d. However, it is also possible for the control device 12 to take additional facts into account. An example of such a situation are temporal changes in the setpoint flows Ka * to Kd * and associated temporal changes in the total flow K and the associated accelerations of water volumes.
- the control device 12 can, for example, to determine de ren speed n, access a family of characteristics in which, as shown in FIG. 4, the speed of the pump 8 is stored n the pump 8 is neces sary to bring about a certain pressure increase dr at a certain total flow K.
- the required pressure increase dr pS ⁇ pAv can thus be determined without further ado.
- the suction pressure pS can Control device 12 be known on the basis of a measurement or otherwise.
- control state determined for the greatest of the individual working pressures pAa to pAd will itself be a permissible control state of the pump arrangement 5. In this case, this control state can be adopted directly as the preliminary control state Z. Other possibilities and configurations will be discussed later.
- step S5 the control device 12 then determines a control state Z 'of the pump arrangement 5.
- the control state Z' is - in contrast to the control state Z - final.
- the control device 12 determines the final control state Z 'of the pump arrangement 5 using the preliminary control state Z of the pump arrangement 5.
- the determination of step S5 is such that the total flow K of coolant 6 is fed to the collecting line 4 by means of the pump arrangement 5.
- the control device 12 directly and immediately takes over the provisional control state Z as the final control state Z '.
- the control device 12 therefore determines the control values Aa to Ad of the control valves 11a to 11d in a step S6 using the final working pressure pAe. The determination takes place in such a way that the respective nominal current Ka * to Kd * flows in the respective branch line 9a to 9d.
- step S6 the control device 12 assumes that the final working pressure pAe prevails in the collecting line 4. For example, the control ka zu thus results for the control valve 11a
- a step S7 the control device 12 controls the pump assembly 5 and the control valves 11a to 11d.
- the control of the pump arrangement 5 takes place in accordance with the final control state Z '.
- the control of the control valves 11a to 11d takes place in accordance with the control values Aa to Ad.
- step S7 the operating method according to the invention is carried out.
- the control device 12 goes back to step S1 after the execution of step S7.
- the control device 12 executes the sequence of steps S1 to S7 iteratively over and over again.
- the execution takes place with a fixed cycle time.
- the fixed cycle time is usually between 0.1 s and 1.0 s, mostly between 0.2 s and 0.5 s, for example around 0.3 s.
- a possible configuration of step S4 from FIG. 3 is explained below in conjunction with FIG Subdivided steps Sil to S14.
- step Sil the control device 12 determines the operating state of the pump arrangement 5, which is required to promote the total flow K and at the same time to effect the required pressure increase dr from the suction pressure pS to the largest of the individual working pressures pAa to pAd determined.
- the control device 12 can determine the corresponding speed n of the pump 8 with only one pump 8.
- step S12 the control device 12 checks whether the provisional state Z determined is permissible, for example the determined speed n is in the permissible speed range of the pump 8, that is to say the operating point of the pump 8 is within the unshaded area in FIG.
- the test thus implies the test for compliance with a secondary condition related to the pump arrangement 5.
- the speed n lies in the permissible speed range of the pump 8.
- an operating point API of the pump 8 can be determined by the total flow K and the largest of the individual working pressures pAa to pAd, which is within the permissible speed range of the pump 8. If the speed n is in the permissible speed range of the pump 8, the control device 12 goes to step S13. In step S13, the control device 12 does not take any further measures. The speed n determined can be used directly.
- the speed n is not in the permissible speed range of the pump 8.
- an operating point AP2 or an operating point AP3 of the pump 8 can be determined.
- the pump 8 can easily generate the highest of the determined individual working pressures pAa to pAd. Due to the permissible speed range of the pump 8, however, there is inevitably a volume flow conveyed by the pump 8 which is greater than the required total flow K. In the case of the working point AP3, it is the other way round.
- the pump 8 can generate the required total current K without further ado. Due to the permissible speed range of the pump 8, there is inevitably a pressure increase dr caused by the pump 8, which is greater than the minimum required.
- step S14 the control device 12 modifies the preliminary control state Z.
- the control device 12 can determine an opening state for a short-circuit valve 15 (see FIG. 6), for example.
- the short-circuit valve 15 is connected in parallel to the pump 8 as shown in FIG. It can be seen as part of the pump arrangement 5 or as a control valve for a further application device.
- the control device 12 determines the opening state if necessary in such a way that enough coolant 6 is returned directly or indirectly to the reservoir 7 via the short-circuit valve 15 that the remaining volume flow, which is the result of the collecting line 4, corresponds to the desired total flow K.
- the control device 12 can, for example, modify the provisional control state Z in such a way that only the pump 8 is actuated (and consequently the short-circuit valve 15, if present, remains closed), with the provisional control state Z, however, with the desired one Total current K a provisional working pressure pAv is generated, which is greater than the largest of the individual working pressures pAa to pAd.
- the preliminary working pressure pAv is preferably set to the minimum of the possible and permissible values.
- step S4 from FIG. 3 is subdivided into steps S21 to S24 within the framework of the embodiment according to FIG.
- the procedure of FIG. 7 can be combined with the procedure of FIG. 5 as required, or it can be implemented independently of it.
- step S21 can be omitted and steps S22 to S24 are carried out after step S13 or S14.
- step S21 the control device 12 determines - analogously to step Sil of FIG. 5 - the speed n of the pump 8, which is required to promote the total flow K and at the same time the required pressure increase dr from the suction pressure pS to the highest of the individual working pressures determined to effect pAa to pAd.
- step S22 the control device 12 checks whether the actuations of the control valves 11a to 11d are permissible at the provisional working pressure pAv thus obtained.
- the control device 12 can, for example, check whether the adjustment speeds with which the control values Aa to Ad of the control valves 11a to 11b are changed adhere to predetermined limits. The test thus implies the test for compliance with secondary conditions related to the control valves.
- control device 12 goes to step S23.
- step S23 the control device 12 does not take any further measures.
- the speed n determined can be used directly.
- step S24 the control device 12 - depending on the situation of the individual case
- an increase in the preliminary working pressure pAv can under certain circumstances prevent the predetermined limits from being exceeded, or at least only to a lesser extent, due to the corresponding changes in the actuation of the control valves 11a to 11d.
- step S41 the control device 12 takes into account
- At least one further control state In addition to the provisional control state Z currently determined in step S4, at least one further control state. For example, it can be the immediately preceding final control status Z 'or several previous final control status Z'. For example, abrupt changes in the final control state Z 'can be avoided by low-pass filtering or similar measures.
- the target currents Ka * to Kd * are model-predictively forecasted within a forecast horizon of several cycle times - for example five, eight or ten cycle times - and thus also determined preliminary control states Z of the pump arrangement 5 expected in the future for the forecast horizon can be.
- the provisional control states Z of the pump arrangement 5 expected in the future can also be included in the determination of the current final control state Z ′.
- a final working pressure pAe results which is smaller (although usually only slightly smaller) than the greatest of the individual working pressures pAa to pAd of steps S2 and S3.
- the present invention has been explained above in connection with embodiments in which the pump arrangement 5 has only a single pump 8.
- the pump arrangement 5 has a plurality of pumps 8 without further res.
- the pumps 8 must be controlled in such a way that all pumps 8 are either completely blocked so that they can be treated as if they were not present or generate the same preliminary working pressure pAv and the same final working pressure pAe .
- the distribution of the total flow K to the individual pumps 8 there is a degree of freedom. To resolve this degree of freedom, it is possible, for example, to distribute the total current K uniformly or proportionally to the capacity of the pumps 8 over the pumps 8. Alternatively, it is possible to always operate only the minimum possible number of pumps 8 actively.
- the collecting line 4 is fed as possible with a single pump 8.
- the next pump 8 is only switched on when the previously operated pump 8 is no longer able to deliver the required total flow K at the required preliminary working pressure pAv or the required final working pressure pAe.
- the next pump 8 is switched on only when the previously operated pumps 8 are no longer able to deliver the required total current K at the required to promote preliminary working pressure pAv or the required final working pressure pAe.
- the present invention was further explained above with respect to a single cooling device 3. It is, however, easily possible that further cooling devices 3 are present.
- the further cooling devices 3 can be controlled by the control device 12 or by another control device as required.
- the cooling devices 3 can be operated independently of one another.
- the present invention has many advantages. In particular, there is very little energy consumption. In comparison to an operation of the cooling device 3 with a constant final working pressure pAe, savings of at least 25% and sometimes well over 80% result. Even compared to procedures in which the final working pressure pAe is individually adjusted for each rolling stock 2 and is only maintained constant while the respective rolling stock 2 is being cooled, there is still a significant energy saving. Theoretically it is conceivable that the reduction in the final working pressure pAe leads to such a great deterioration in the efficiency of the pump arrangement 5 that the energy consumption increases. In practice, however, this does not happen. Furthermore, both the mechanics of the control valves 11a to 11d and the mechanics of the pump arrangement 5 are spared.
- control valves 11a to 11d are operated as open as possible. It is also advantageous for the pump assembly 5 if it is operated at the lowest possible speed. For the cooling of the rolling stock 2 as such, however, there are no adverse effects.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Sorption Type Refrigeration Machines (AREA)
- Control Of Metal Rolling (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202180028584.1A CN115397575A (zh) | 2020-04-14 | 2021-03-29 | 以最小工作压力运行冷却装置 |
JP2022562567A JP2023525657A (ja) | 2020-04-14 | 2021-03-29 | 最小限の動作圧力を用いた冷却ユニットの運転 |
US17/915,350 US20230191465A1 (en) | 2020-04-14 | 2021-03-29 | Operation of a cooling unit with a minimal working pressure |
BR112022020917A BR112022020917A2 (pt) | 2020-04-14 | 2021-03-29 | Operação de uma unidade de refrigeração com uma pressão de funcionamento mínima |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20169326.4A EP3895819B1 (de) | 2020-04-14 | 2020-04-14 | Betrieb einer kühleinrichtung mit einem minimalen arbeitsdruck |
EP20169326.4 | 2020-04-14 | ||
EP20169741.4A EP3895820A1 (de) | 2020-04-14 | 2020-04-16 | Betrieb einer kühleinrichtung mit einem minimalen arbeitsdruck |
EP20169741.4 | 2020-04-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2021209251A1 true WO2021209251A1 (de) | 2021-10-21 |
Family
ID=70289348
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2021/058174 WO2021209251A1 (de) | 2020-04-14 | 2021-03-29 | Betrieb einer kühleinrichtung mit einem minimalen arbeitsdruck |
Country Status (6)
Country | Link |
---|---|
US (1) | US20230191465A1 (de) |
EP (2) | EP3895819B1 (de) |
JP (1) | JP2023525657A (de) |
CN (1) | CN115397575A (de) |
BR (1) | BR112022020917A2 (de) |
WO (1) | WO2021209251A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102022128358A1 (de) | 2022-10-26 | 2024-05-02 | Sms Group Gmbh | Kühlmodul, Kühlgruppe, Kühlsystem, Verfahren, warmgewalztes metallisches bandförmiges Produkt und Verwendung |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013143925A1 (de) | 2012-03-28 | 2013-10-03 | Siemens Aktiengesellschaft | Steuerung einer kühlung |
WO2014124867A1 (de) | 2013-02-14 | 2014-08-21 | Siemens Vai Metals Technologies Gmbh | Kühlung eines metallbandes mit positionsgeregelter ventileinrichtung |
WO2014124868A1 (de) | 2013-02-15 | 2014-08-21 | Siemens Vai Metals Technologies Gmbh | Kühlstrecke mit power cooling und laminarkühlung |
EP3395463A1 (de) * | 2017-04-26 | 2018-10-31 | Primetals Technologies Austria GmbH | Kühlung eines walzguts |
WO2019115145A1 (de) | 2017-12-11 | 2019-06-20 | Primetals Technologies Germany Gmbh | Verbesserte steuerung der wasserwirtschaft einer kühlstrecke |
DE102018205684A1 (de) * | 2018-04-13 | 2019-10-17 | Sms Group Gmbh | Kühleinrichtung und Verfahren zu deren Betrieb |
WO2020020868A1 (de) | 2018-07-25 | 2020-01-30 | Primetals Technologies Germany Gmbh | Kühlstrecke mit einstellung der kühlmittelströme durch pumpen |
-
2020
- 2020-04-14 EP EP20169326.4A patent/EP3895819B1/de active Active
- 2020-04-16 EP EP20169741.4A patent/EP3895820A1/de not_active Withdrawn
-
2021
- 2021-03-29 JP JP2022562567A patent/JP2023525657A/ja active Pending
- 2021-03-29 US US17/915,350 patent/US20230191465A1/en active Pending
- 2021-03-29 WO PCT/EP2021/058174 patent/WO2021209251A1/de active Application Filing
- 2021-03-29 BR BR112022020917A patent/BR112022020917A2/pt unknown
- 2021-03-29 CN CN202180028584.1A patent/CN115397575A/zh active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013143925A1 (de) | 2012-03-28 | 2013-10-03 | Siemens Aktiengesellschaft | Steuerung einer kühlung |
WO2014124867A1 (de) | 2013-02-14 | 2014-08-21 | Siemens Vai Metals Technologies Gmbh | Kühlung eines metallbandes mit positionsgeregelter ventileinrichtung |
WO2014124868A1 (de) | 2013-02-15 | 2014-08-21 | Siemens Vai Metals Technologies Gmbh | Kühlstrecke mit power cooling und laminarkühlung |
EP3395463A1 (de) * | 2017-04-26 | 2018-10-31 | Primetals Technologies Austria GmbH | Kühlung eines walzguts |
WO2019115145A1 (de) | 2017-12-11 | 2019-06-20 | Primetals Technologies Germany Gmbh | Verbesserte steuerung der wasserwirtschaft einer kühlstrecke |
DE102018205684A1 (de) * | 2018-04-13 | 2019-10-17 | Sms Group Gmbh | Kühleinrichtung und Verfahren zu deren Betrieb |
WO2020020868A1 (de) | 2018-07-25 | 2020-01-30 | Primetals Technologies Germany Gmbh | Kühlstrecke mit einstellung der kühlmittelströme durch pumpen |
Also Published As
Publication number | Publication date |
---|---|
JP2023525657A (ja) | 2023-06-19 |
CN115397575A (zh) | 2022-11-25 |
EP3895820A1 (de) | 2021-10-20 |
EP3895819B1 (de) | 2023-06-07 |
EP3895819A1 (de) | 2021-10-20 |
BR112022020917A2 (pt) | 2022-12-06 |
US20230191465A1 (en) | 2023-06-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2206031B1 (de) | Regeleinrichtung zum positionsregeln einer hydraulikzylindereinheit, mit linearisierungseinheit | |
CH705466A1 (de) | Verfahren zum Betreiben und/oder Überwachen einer HVAC-Anlage sowie HVAC-Anlage zur Durchführung des Verfahrens. | |
EP2678563B1 (de) | Leistungsoptimiertes betreiben einer elektromotorisch angetriebenen pumpe durch mitkopplung | |
WO2019115145A1 (de) | Verbesserte steuerung der wasserwirtschaft einer kühlstrecke | |
EP2837829A1 (de) | Kennfeldregelung von Kreiselpumpen | |
WO2020020868A1 (de) | Kühlstrecke mit einstellung der kühlmittelströme durch pumpen | |
WO2021209251A1 (de) | Betrieb einer kühleinrichtung mit einem minimalen arbeitsdruck | |
DE102017116399A1 (de) | Verfahren zum Regeln von wenigstens zwei Ventilatoren | |
EP3135924B1 (de) | Hydrauliksteuerung | |
EP3267039B1 (de) | Verfahren und system zur regelung einer pumpstation | |
EP3354372B1 (de) | Kühlsystem, hüttentechnische anlage und verfahren zum betreiben eines kühlsystems | |
EP3623068B1 (de) | Aufbringeinrichtungen von kühlstrecken mit zweitem anschluss | |
EP3561395B1 (de) | Anordnung und verfahren zur steuerung der beladung eines pufferspeichers für eine fernwärmeabnehmerseite und fernwärmeübergabestation | |
EP2544872A1 (de) | Vorrichtung zur präzisen regelung des unterdruckes | |
EP1321842B1 (de) | Hydraulische Anlage | |
DE102021001967A1 (de) | Druckstoßfreies Aus- und Einkoppeln von Pumpen | |
WO2021175945A1 (de) | Verfahren zur durchfluss-und/oder druckregelung in einer hydraulischen anlage | |
WO2022263266A1 (de) | Verfahren zum herstellen eines walzguts mit kastenprofil | |
WO2020193099A1 (de) | Vermeidung von wellen beim walzen von metallbändern | |
EP4029618A1 (de) | Walzen mit minimierung des einbruchs der biegekraft beim anstich | |
DE102022004376A1 (de) | Versorgungsvorrichtung | |
WO2021013355A1 (de) | Förderanordnung mit zwei parallel geschalteten förderelementen | |
EP2836879A1 (de) | Regeleinrichtung für eine hydraulikzylindereinheit mit einzelventilsteuerung | |
EP2530333A2 (de) | Bearbeitungsvorrichtung |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 21716147 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2022562567 Country of ref document: JP Kind code of ref document: A |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112022020917 Country of ref document: BR |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 112022020917 Country of ref document: BR Kind code of ref document: A2 Effective date: 20221014 |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 21716147 Country of ref document: EP Kind code of ref document: A1 |