EP3826780A1 - Kühlstrecke mit einstellung der kühlmittelströme durch pumpen - Google Patents
Kühlstrecke mit einstellung der kühlmittelströme durch pumpenInfo
- Publication number
- EP3826780A1 EP3826780A1 EP19740415.5A EP19740415A EP3826780A1 EP 3826780 A1 EP3826780 A1 EP 3826780A1 EP 19740415 A EP19740415 A EP 19740415A EP 3826780 A1 EP3826780 A1 EP 3826780A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- coolant
- cooling section
- rolling stock
- control device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 129
- 239000002826 coolant Substances 0.000 title claims abstract description 123
- 238000005096 rolling process Methods 0.000 claims abstract description 125
- 239000007788 liquid Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 20
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 12
- 238000005098 hot rolling Methods 0.000 claims description 37
- 238000011017 operating method Methods 0.000 claims description 18
- 230000004913 activation Effects 0.000 claims description 9
- 239000007921 spray Substances 0.000 description 40
- 238000013461 design Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical group CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000454 anti-cipatory effect Effects 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- 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
-
- 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
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
Definitions
- the cooling section 2 could be arranged upstream of the rolling mill in accordance with the illustration in FIG. FIG. 2 also shows only a single roll stand 4 of the rolling train, namely the first roll stand 4 of the rolling train.
- the rolling train - as in the design from FIG. 1 - has a plurality of rolling stands 3 which the hot rolling stock 1 passes through sequentially in succession.
- the hot rolling stock 1 is rolled in the first roll stand 4 of the rolling mill immediately after it leaves the cooling section 2.
- a temporary rather the distance between the cooling in the cooling section 2 and the rolling in the first roll stand 4 of the rolling train is in the range of a few minutes. However, it can only take a few seconds.
- the cooling section 2 could be arranged according to the presen- tation in FIG 3 within the rolling mill.
- two roll stands 5 of the rolling mill In this case, the rolling of the rolling stock 1 - more precisely: a section of the rolling stock 1 - takes place in the cooling section 2 between the rolling in the two roll stands 5 of the rolling train.
- a time interval between cooling in the cooling section 2 and rolling in the two successive Walzgerüs th 5 of the rolling mill is in the range of a few seconds.
- the cooling section 2 is net angeord between two successive roll stands 5 of the rolling mill. However, it could also extend over a larger area, so that the cooling section 2 is subdivided into a corresponding number of sections by at least one further roll stand (not shown in FIG. 3).
- the rolling stock 1 is made of metal.
- the rolling stock 1 can consist of steel or aluminum. Other metals are also possible.
- the temperature of the rolling stock 1 in front of the cooling section 2 is generally between 750 ° C and 1,200 ° C.
- cooling takes place to a lower temperature. It is possible in individual cases that the lower temperature is only slightly below the temperature in front of the cooling section 2.
- the rolling stock 1 is usually cooled to a significantly lower temperature, for example to a temperature between 200 ° C and 700 ° C.
- the target control state S * can also be determined easily. This will be explained below using a simple example.
- Equation (3) is now solved for pA:
- the actual current F is given without further ado. For example, it can be measured.
- the desired time derivative of the actual current F results directly from the difference between the target current F * and the actual current F. If necessary, the time derivative of the actual current F can be limited in order to increase the pressure pA on the outlet side within permissible limits hold .
- the actual current F provided that it is not recorded by measurement, can be easily determined using the relationship can be determined, where F0 is a suitably chosen constant.
- the control device 11 has the actual current F available at all times, either by measurement or by calculation according to equation (6). This is necessary in order to be able to mathematically update a thermodynamic energy state H of the rolling stock 1. This will be discussed in more detail later. As the dead time of the application device 6, only the generally very small time that the coolant 7 requires occurs, in order to hit the rolling stock 1, as calculated from the exit from the application device 6.
- the pump 10 - In order to be able to control the pump 10 accordingly, the pump 10 - more precisely: its drive 12 - must be able to be operated at a variable speed.
- the drive 12 of the pump 10 can be converter-controlled for this purpose.
- Such controls are generally known to experts and therefore need not be explained in more detail.
- the pump 10 is preferably operated in a control range between 0 and a maximum speed. A seal of the pump 10 should also be designed for low speeds. However, this is possible without further.
- Corresponding pumps 10 are known to experts.
- the shut-off device 13 is kept permanently completely open during the transport of the rolling stock 1 through the cooling section 2. This is illustrated in FIG. 5 by the fact that the rolling stock 1 enters the cooling section 2 at a time t 1. However, the shut-off device 13 is opened at a time t 2 before the time t 1. In an analogous manner, the rolling stock 1 runs out of the cooling section 2 at a time t3. Only after time t3 is the shut-off device 13 closed again at a time t4. The shut-off device 13 remains permanently fully open between the times t2 and t4.
- the shut-off device 13 is actuated only when a speed of the pump 10 is below a minimum speed nmin. This is explained in more detail below in connection with FIG. 6.
- the speed of the pump 10 can vary between 0 and a nominal speed nmax. If and as long as the speed n remains below a minimum speed nmin, the locking device 13 can be actuated. This applies both to opening and closing of the shut-off device 13. If and as soon as the speed n reaches or exceeds the minimum speed nmin, the shut-off device 13 remains open. In this case, in particular, the shut-off device 13 must first be opened at a very low speed n. Then the operation of the Bring device 6, during which only the pump 10 is appropriately actuated for setting the actual current F. Only when the speed n falls below the minimum speed nmin can the shut-off device 13 be actuated again.
- the target current F * can vary. With larger values, a speed n of the pump 10 is at significant values, so that the pump 10 actively pumps (pumps) the coolant 7. The pump 10 thereby consumes energy E. However, if the target current F * becomes smaller, it can happen that the pump 10 continues to rotate in the same direction of rotation as for larger values, but the pump 10 is operated generatively. So it gives off energy E. For example, the energy E can be fed back into a supply network via the drive 12 of the pump 10. It is even possible for the pump 10 to be operated with the direction of rotation inverted (“rotational speed n ⁇ 0”). In this case, the pump 10 continues to consume energy because it is actively trying to return coolant 7.
- the pump 10 can be switched off after the shut-off device 13 has been closed, as soon as the shut-off device 13 is closed, ie further flow of the coolant 7 is blocked.
- the shut-off device 13 does not have to slow down the flow of the coolant 7, but only closes when the flow of the coolant 7 is already stopped or at least substantially stopped, a comparatively simple embodiment of the shut-off device 13 is sufficient.
- the shut-off device 13 can have a low dynamic range, since dynamic settings by the pump 10 respectively.
- such a check valve 16 or such a return flap is also required if an application device 6 arranged above the rolling stock 1 is fed via the pump 10. Otherwise, the coolant 7 would flow backwards through the pump 10 into the reservoir 9 at speed 0. This could empty a buffer area of the transfer device 6. The buffer area would then only have to be filled again when the pump 10 is switched on again. This would increase the effective response time of Aufbringein device 6, which - of course - is not what he wants.
- thermodynamic energy state H of the corresponding section of the rolling stock 1 varies from application device 6 to application device 6. In particular, it is changed by each of the application devices 6.
- the thermodynamic energy state H of the control device 11 can be predetermined as such for the application device 6, which first applies its share of coolant 7 to the rolling stock 1.
- the cooling section 2 may have a temperature measuring station 17 on its input side, by means of which the temperature T is recorded for the individual sections of the rolling stock 1. The detected temperature T is then assigned to the respective section.
- the application devices 6 each have only a single spray nozzle 18. As a rule, however, the application devices 6 each have a plurality of spray nozzles 18.
- the spray nozzles 18 can accordingly be arranged one behind the other as shown in FIG 11 in the transport direction x of the rolling stock 1.
- the present invention has many advantages, some of which are listed below.
- the cooling section 2 can be operated with a low energy consumption.
- some of the application devices 6 can be designed as customary underside intensive cooling beams with a spraying height of 20 m, which apply the coolant 7 to the rolling stock 1 from below.
- 360 m 3 / h corresponds to 0.1 m 3 / s.
- 20 m spray height corresponds to an operating pressure of 2 bar, i.e. 200 kPa.
- intensive cooling of the state of the art works with around twice the pressure. Similar figures result for intensive cooling on the top.
- the reduction in the amount of water is achieved by closing a valve.
- the pressure (4 bar) is maintained, the pump 10 often continues to run at full flow.
- the speed n of the pump 10 is simply reduced.
- only a spray height of 5 m occurs. So only half of the amount has to be pumped with a quarter of the spraying height. This means that only 1/8 of the full power is required, i.e. just over 3 kW. In contrast, around 25 kW still have to be used in the intensive cooling of the prior art.
- the wear on pumps 10 and drives 12 is low. Typical downtimes for pump bearings are 100,000 hours and more. This means that the pumps 10 can be operated continuously for over 11 years without maintenance.
- the cooling section 2 according to the invention is therefore very reliable and requires almost no maintenance with regard to the pumps 10 and the drives 12.
- the equipment of the cooling section 2 with the required number of pumps 10 and associated drives 12 including the associated drive controls also requires a certain investment. However, this one-time investment is compensated for relatively quickly by the lower operating costs and the increased system availability. In addition, the costs are relativized if one takes into account that considerable costs are also incurred for a conventional cooling section when using high-quality ball valves.
- the ball valves cost around € 700,000.
- 100 upper spray bars are supplied with 50 pumps 10 and 100 lower spray bars are supplied with 50 lower pumps.
- the costs for the cooling section 2 according to the invention are of the same order of magnitude as the cost of conventional intensive cooling.
- 16 upper and lower spray bars 19 a total of 32 relatively small pumps 10 and the associated drives 12 to 25 kW each with a total electrical output of 800 kW are required.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18185526.3A EP3599037A1 (de) | 2018-07-25 | 2018-07-25 | Kühlstrecke mit einstellung der kühlmittelströme durch pumpen |
PCT/EP2019/069763 WO2020020868A1 (de) | 2018-07-25 | 2019-07-23 | Kühlstrecke mit einstellung der kühlmittelströme durch pumpen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3826780A1 true EP3826780A1 (de) | 2021-06-02 |
EP3826780B1 EP3826780B1 (de) | 2023-01-25 |
Family
ID=63047236
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18185526.3A Withdrawn EP3599037A1 (de) | 2018-07-25 | 2018-07-25 | Kühlstrecke mit einstellung der kühlmittelströme durch pumpen |
EP19740415.5A Active EP3826780B1 (de) | 2018-07-25 | 2019-07-23 | Kühlstrecke mit einstellung der kühlmittelströme durch pumpen |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18185526.3A Withdrawn EP3599037A1 (de) | 2018-07-25 | 2018-07-25 | Kühlstrecke mit einstellung der kühlmittelströme durch pumpen |
Country Status (4)
Country | Link |
---|---|
US (1) | US11167332B2 (de) |
EP (2) | EP3599037A1 (de) |
CN (1) | CN112469516B (de) |
WO (1) | WO2020020868A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019104419A1 (de) * | 2019-02-21 | 2020-08-27 | Sms Group Gmbh | Verfahren zur Einstellung verschiedener Kühlverläufe von Walzgut über der Bandbreite einer Kühlstrecke in einer Warmband- oder Grobblech-Straße |
EP3895819B1 (de) | 2020-04-14 | 2023-06-07 | Primetals Technologies Germany GmbH | Betrieb einer kühleinrichtung mit einem minimalen arbeitsdruck |
EP3896286A1 (de) | 2020-04-14 | 2021-10-20 | Primetals Technologies Germany GmbH | Betrieb einer pumpe einer kühleinrichtung ohne verwertung eines mehrdimensionalen, gemessenen kennlinienfeldes |
Family Cites Families (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60174833A (ja) * | 1984-02-20 | 1985-09-09 | Nippon Steel Corp | 熱鋼板の冷却方法 |
WO2004076086A2 (de) * | 2003-02-25 | 2004-09-10 | Siemens Aktiengesellschaft | Verfahren zur regelung der temperatur eines metallbandes, insbesondere in einer fertigstrasse zum walzen von metallwarmband |
EP1452252A1 (de) | 2003-02-28 | 2004-09-01 | Hubert Dipl.-Ing. Sommerhofer | Verfahren zum Stranggiessen |
EP1844880A1 (de) | 2006-04-12 | 2007-10-17 | So & So Sommerhofer OEG | Bandgiessen |
US7617863B2 (en) | 2006-08-11 | 2009-11-17 | Rti International Metals, Inc. | Method and apparatus for temperature control in a continuous casting furnace |
JP5028310B2 (ja) * | 2008-03-21 | 2012-09-19 | 株式会社日立製作所 | 熱間圧延機のスタンド間冷却制御装置および制御方法 |
EP2108465A1 (de) | 2008-04-07 | 2009-10-14 | Siemens VAI Metals Technologies Ltd. | Verfahren und Vorrichtung für gesteuerte Kühlung |
EP2174729A1 (de) | 2008-10-07 | 2010-04-14 | Siemens Aktiengesellschaft | Entzunderungseinrichtung mit drehzahlvariablem Pumpenantrieb |
FR2942629B1 (fr) | 2009-03-02 | 2011-11-04 | Cmi Thermline Services | Procede de refroidissement d'une bande metallique circulant dans une section de refroidissement d'une ligne de traitement thermique en continu, et installation de mise en oeuvre dudit procede |
CN102725078B (zh) | 2010-01-29 | 2015-04-01 | 东芝三菱电机产业***株式会社 | 轧制线上的注水控制装置、注水控制方法、注水控制程序 |
EP2361699A1 (de) * | 2010-02-26 | 2011-08-31 | Siemens Aktiengesellschaft | Verfahren zur Kühlung eines Blechs mittels einer Kühlstrecke, Kühlstrecke und Steuer- und/oder Regeleinrichtung für eine Kühlstrecke |
JP5617321B2 (ja) | 2010-04-12 | 2014-11-05 | 新日鐵住金株式会社 | 冷却装置を駆動するポンプを用いた鋼板の製造方法 |
JP5914365B2 (ja) * | 2011-01-21 | 2016-05-11 | 株式会社荏原製作所 | 給水装置 |
US10465674B2 (en) * | 2012-07-26 | 2019-11-05 | Hp Indigo B.V. | Method and system for determining a pump setpoint |
DE102012215599A1 (de) | 2012-09-03 | 2014-03-06 | Sms Siemag Ag | Verfahren und Vorrichtung zur dynamischen Versorgung einer Kühleinrichtung zum Kühlen von Metallband oder sonstigem Walzgut mit Kühlmittel |
EP2767353A1 (de) * | 2013-02-15 | 2014-08-20 | Siemens VAI Metals Technologies GmbH | Kühlstrecke mit Power Cooling und Laminarkühlung |
EP2792428A1 (de) * | 2013-04-15 | 2014-10-22 | Siemens VAI Metals Technologies GmbH | Kühleinrichtung mit breitenabhängiger Kühlwirkung |
EP2873469A1 (de) * | 2013-11-18 | 2015-05-20 | Siemens Aktiengesellschaft | Betriebsverfahren für eine Kühlstrecke |
EP2898963A1 (de) * | 2014-01-28 | 2015-07-29 | Siemens Aktiengesellschaft | Kühlstrecke mit zweifacher Kühlung auf eine jeweilige Sollgröße |
JP6090224B2 (ja) * | 2014-04-10 | 2017-03-08 | Jfeスチール株式会社 | 制御冷却設備および制御冷却方法 |
GB2550598A (en) * | 2016-05-24 | 2017-11-29 | Bofa International Ltd | Fume extraction |
-
2018
- 2018-07-25 EP EP18185526.3A patent/EP3599037A1/de not_active Withdrawn
-
2019
- 2019-07-23 CN CN201980049320.7A patent/CN112469516B/zh active Active
- 2019-07-23 US US17/261,080 patent/US11167332B2/en active Active
- 2019-07-23 EP EP19740415.5A patent/EP3826780B1/de active Active
- 2019-07-23 WO PCT/EP2019/069763 patent/WO2020020868A1/de active Application Filing
Also Published As
Publication number | Publication date |
---|---|
CN112469516A (zh) | 2021-03-09 |
EP3826780B1 (de) | 2023-01-25 |
US11167332B2 (en) | 2021-11-09 |
CN112469516B (zh) | 2023-04-11 |
WO2020020868A1 (de) | 2020-01-30 |
US20210245215A1 (en) | 2021-08-12 |
EP3599037A1 (de) | 2020-01-29 |
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