EP2420329A1 - Installation d'allumage - Google Patents

Installation d'allumage Download PDF

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Publication number
EP2420329A1
EP2420329A1 EP10173232A EP10173232A EP2420329A1 EP 2420329 A1 EP2420329 A1 EP 2420329A1 EP 10173232 A EP10173232 A EP 10173232A EP 10173232 A EP10173232 A EP 10173232A EP 2420329 A1 EP2420329 A1 EP 2420329A1
Authority
EP
European Patent Office
Prior art keywords
pump motor
descaling
winding
str
respective pump
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.)
Withdrawn
Application number
EP10173232A
Other languages
German (de)
English (en)
Inventor
Jens Georgi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP10173232A priority Critical patent/EP2420329A1/fr
Priority to CN201180039901.6A priority patent/CN103052454B/zh
Priority to EP11732419.4A priority patent/EP2605872B1/fr
Priority to PCT/EP2011/061487 priority patent/WO2012022536A2/fr
Publication of EP2420329A1 publication Critical patent/EP2420329A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B21B45/04—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 de-scaling, e.g. by brushing
    • B21B45/08—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 de-scaling, e.g. by brushing hydraulically

Definitions

  • the invention relates to a descaling plant for descaling in hot rolling mills, comprising at least one hydraulic pump which is driven by means of a pump motor.
  • the invention relates to a method for operating the Entzu mattersstrom.
  • Hydraulic descalers are almost indispensable components of hot rolling mills. Descaling of a rolling stock surface occurs by blasting high pressure water onto the surface of the material by means of special nozzles. With the development of thin slab casters and rolling mills increasingly high operating pressures were needed. A descaling system works today with an operating pressure between 180 bar and 400 bar. The pressure is generated by a rotary or piston pump. Piston pumps have the disadvantage of uneven delivery, which causes pressure oscillations or pressure pulsations at the pump outlet.
  • Centrifugal pumps For centrifugal pumps, the operating behavior is directly related to the speed, the impeller shape and the impeller diameter. Centrifugal pumps are characterized by freedom from pulsation and a relatively low purchase price.
  • the pump of a descaling unit is driven by a pump motor with a power range from 2000kW to 3000kW.
  • the pump motor is designed as a mains-operated high-voltage motor with fixed speed. Connected to a 50Hz mains supply, for example, results in a speed of 3000 U / min.
  • a usual supply voltage is in the range between 6kV and 10kV.
  • the pump of a descaling plant operates during a Entzu mecanicspause in an internal circuit (bypass) under partial load at fixed speed. Water pressure and water flow are adjusted by a gate valve depending on the process requirements.
  • the invention has for its object to provide for a Entzu matterssstrom of the type mentioned an improvement over the prior art.
  • the descaling plant for descaling in hot rolling mills comprises at least one hydraulic pump, which is driven by means of a pump motor.
  • This pump motor is designed as a pole-changing motor and connected to a controller which is set up for pole switching between descaling and Entzu mecanicspausen.
  • the stator of the pole-changing three-phase motor thus has at least two winding systems, which cause different speeds of the rotor.
  • a plurality of pumps are connected in parallel to generate pressure, each pump is driven by a pole-changing pump motor.
  • a pole-changing pump motor For a hot strip mill or a plate mill, it makes sense if 2 to 3 pumps are used. The individual aggregates are then smaller. In addition to lower investment costs, this means a simple repair option, since in a defect usually only one unit must be replaced. In addition, the importance of achieving energy savings in large-scale systems with multiple pumps is increasing.
  • a pump is switched in standby mode parallel to the pumps operating in normal operation. In the event of a defect or a planned pump replacement, the additional pump is used, which avoids interruption of the casting or rolling process.
  • each pump motor is controlled by a common control.
  • Descaling systems in rolling mills usually have a powerful controller (eg SIMATIC S7). It therefore makes sense to set up this control for the pole change of all pump motors. The controller then monitors all switches or starts so that, for example, when switching from high speed to low speed, undesirable over-synchronous braking does not occur.
  • each pump motor has two winding systems, which alternately by means of pole change to a Supply voltage can be switched. It is advantageous if a first winding system of the respective pump motor is designed to have four poles and if a second winding system of the respective pump motor is designed with two poles. By switching from the second winding system to the first winding system thus the speed of the pump motor is halved. Such halving is sufficient to achieve significant energy savings during a descaling break.
  • the respective pump motor comprises a medium-voltage switching cell with vacuum contactors for pole changeover.
  • the vacuum contactors are controlled by the control and allow far higher switching cycles than ordinary circuit breakers.
  • the respective pump motor is coupled to a speed sensor.
  • the determined engine speed is compared with the synchronous speed and avoided in this way over-synchronous deceleration.
  • the respective pump motor is briefly removed from the grid during a changeover. The engine brakes down automatically. In this phase, the pole change takes place. Only when the engine speed has reached the lower synchronous speed, the controller switches the motor again to the supply network.
  • the inventive method provides that two winding systems of a respective pump motor are switched by means of control alternately to a supply voltage.
  • the respective pump motor is advantageously operated during a Entzu matterspause with a first winding system and operated during a descaling with a second winding system.
  • Fig. 1 two winding systems of a pump motor M are shown, wherein these are arranged in a so-called star / double star connection.
  • a four-pole first winding system is shown as a star connection.
  • first stator terminals 1U, 1V, 1W At the ends of the branches are first stator terminals 1U, 1V, 1W.
  • second stator terminals 2U, 2V, 2W Between each two windings of a branch there are second stator terminals 2U, 2V, 2W.
  • first stator terminals 1U, 1V, 1W are connected to one Supply voltage switched.
  • a two-pole second winding system is formed by the first stator terminals 1U, 1V, 1W of the Supply voltage separated and connected together.
  • the second stator terminals 2U, 2V, 2W are connected to the supply voltage.
  • the double star circuit is obtained. During star connection with the first winding system, the motor runs at a low speed. Switching to the double star connection with the second winding system causes a higher engine speed.
  • the power ratio is about 0.3: 1.
  • a similar variant is the triangular / double star circuit.
  • the first winding system is arranged in a triangular circuit.
  • Each branch of the triangular circuit again has two windings arranged in series.
  • the first stator terminals 1U, 1V, 1W At the vertices of the triangle are the first stator terminals 1U, 1V, 1W.
  • the second stator terminals 2U, 2V, 2W Between each two windings of a branch are the second stator terminals 2U, 2V, 2W.
  • the external connection for switching between the first and second winding system remains unchanged.
  • the Polumscniesen described with switching between star or delta and double star circuit are also known as Dahlanderscnies.
  • Fig. 2 an exemplary external interconnection of a Dahlander circuit is shown.
  • the second stator terminals 2U, 2V, 2W can be connected via a first contactor Q1 to the phases L1, L2, L3 of a supply voltage.
  • the first stator terminals 1U, 1V, 1W can be connected via a second contactor Q2 to the phases L1, L2, L3 of a supply voltage and connected to one another via a third contactor Q3.
  • a motor protection switch QS1, QS2 is arranged in each case. Instead of two circuit breakers QS1, QS2, only one circuit breaker can be arranged in a common connection line.
  • Other known protective devices can ensure a suitable protection of the pump motor M.
  • the contactors Q1, Q2, Q3, which are preferably designed as vacuum contactors, and the circuit breakers are connected to a control STR.
  • This control is also the signal of a speed sensor D supplied.
  • the pole change takes place by means of the control STR.
  • the STR control monitors the starts and shifts, so that when switching from high speed to the lower speed does not come to super-synchronous braking.
  • the pump motor M is powered up by means of a pole change circuit, whereby the starter currents are significantly reduced compared to systems with fixed speed.
  • the controller is also set up to perform protection functions. These include, for example, protection against overcurrents (I 2 t monitoring) and the limitation of the switching cycles to a value permissible for the contactors.
  • additional pumps P2, P3, PS are connected to the control STR.
  • some pumps P1, P2, Pn in normal operation and one pump PS in standby mode e.g. some pumps P1, P2, Pn in normal operation and one pump PS in standby mode.
  • a control of all pumps P1, P2, Pn, PS by means of a common control STR simplifies a coordinated startup and switching of the individual pumps P1, P2, Pn, PS.
  • a pole change of all pumps P1, P2, Pn in use can take place either synchronously or in succession. In the latter case, the arrangement of several pumps P1, P2, Pn contributes to the fact that the pressure does not suddenly drop or rise. The burden on the system is kept low.
  • FIGS. 3 and 4 An alternative embodiment of the invention is in the FIGS. 3 and 4 shown.
  • Fig. 3 shows two separate winding systems of a stator.
  • the four-pole first winding system shown on the left is a star connection with the first stator terminals 1U, 1V, 1W.
  • the two-pole winding system shown on the right is a star connection with the second stator terminals 2U, 2V, 2W.
  • Fig. 4 shows an exemplary structure of a circuit for switching between two separate winding systems.
  • two contactors Q1, Q2 are arranged, by means of which in each case a winding system to the phases L1, L2, L3 of a supply voltage can be switched.
  • protective devices F1, F2, F3 are provided for protection against overcurrents.
  • These protection devices F1, F2, F3, like the contactors Q1, Q2, are connected to a control STR.
  • the control STR has the same already above Fig. 2 described functionalities.
  • Fig. 5 the characteristics of a pump P1, P2, Pn, PS and a Entzu matterssstrom are shown.
  • a head H is indicated above a flow Q.
  • the lower diagram shows the pump or motor power L over the flow rate Q.
  • the system curve A does not change.
  • changing the pole from a higher speed to a lower speed changes the pump characteristic W1, W2.
  • As operating point B1, B2 always results in the intersection between system characteristic A and pump characteristic W1 and W2.
  • the delivery head If the delivery rate is reduced from 100% to 50% during a descaling break, the delivery head also drops from 100% to, for example, 25%.
  • the switching causes the power L to drop from 100% to, for example, 12.5%. Halving the speed (for example, 3000rpm to 1500rpm at 50Hz line frequency) will result in a significant power reduction (about 1/8).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Control Of Ac Motors In General (AREA)
  • Metal Rolling (AREA)
EP10173232A 2010-08-18 2010-08-18 Installation d'allumage Withdrawn EP2420329A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP10173232A EP2420329A1 (fr) 2010-08-18 2010-08-18 Installation d'allumage
CN201180039901.6A CN103052454B (zh) 2010-08-18 2011-07-07 去氧化皮设备以及用于控制去氧化皮设备的方法
EP11732419.4A EP2605872B1 (fr) 2010-08-18 2011-07-07 Installation de décalaminage
PCT/EP2011/061487 WO2012022536A2 (fr) 2010-08-18 2011-07-07 Installation de décalaminage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10173232A EP2420329A1 (fr) 2010-08-18 2010-08-18 Installation d'allumage

Publications (1)

Publication Number Publication Date
EP2420329A1 true EP2420329A1 (fr) 2012-02-22

Family

ID=43479622

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10173232A Withdrawn EP2420329A1 (fr) 2010-08-18 2010-08-18 Installation d'allumage
EP11732419.4A Not-in-force EP2605872B1 (fr) 2010-08-18 2011-07-07 Installation de décalaminage

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP11732419.4A Not-in-force EP2605872B1 (fr) 2010-08-18 2011-07-07 Installation de décalaminage

Country Status (3)

Country Link
EP (2) EP2420329A1 (fr)
CN (1) CN103052454B (fr)
WO (1) WO2012022536A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063645A1 (fr) * 1998-06-04 1999-12-09 Emerson Electric Co. Moteur trois vitesses monophase a enroulements communs
EP2174729A1 (fr) * 2008-10-07 2010-04-14 Siemens Aktiengesellschaft Dispositif d'allumage doté d'un entraînement de pompe à vitesse de rotation variable

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3231698B2 (ja) * 1998-03-19 2001-11-26 株式会社神戸製鋼所 表面性状の優れた熱延鋼板の製造方法
CN100563862C (zh) * 2007-11-12 2009-12-02 二重集团（德阳）重型装备股份有限公司 热连轧生产线的高压水除鳞系统

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063645A1 (fr) * 1998-06-04 1999-12-09 Emerson Electric Co. Moteur trois vitesses monophase a enroulements communs
EP2174729A1 (fr) * 2008-10-07 2010-04-14 Siemens Aktiengesellschaft Dispositif d'allumage doté d'un entraînement de pompe à vitesse de rotation variable

Also Published As

Publication number Publication date
WO2012022536A2 (fr) 2012-02-23
CN103052454B (zh) 2015-09-02
WO2012022536A3 (fr) 2012-09-20
EP2605872A2 (fr) 2013-06-26
EP2605872B1 (fr) 2016-01-20
CN103052454A (zh) 2013-04-17

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