EP2337642A2 - Descaling device comprising a pump drive operated at a variable speed - Google Patents

Descaling device comprising a pump drive operated at a variable speed

Info

Publication number
EP2337642A2
EP2337642A2 EP09782752A EP09782752A EP2337642A2 EP 2337642 A2 EP2337642 A2 EP 2337642A2 EP 09782752 A EP09782752 A EP 09782752A EP 09782752 A EP09782752 A EP 09782752A EP 2337642 A2 EP2337642 A2 EP 2337642A2
Authority
EP
European Patent Office
Prior art keywords
descaling
pressure
electric motor
nozzles
liquid
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
Application number
EP09782752A
Other languages
German (de)
French (fr)
Other versions
EP2337642B2 (en
EP2337642B1 (en
Inventor
Guido Bodden
Jochen Wermke
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.)
Primetals Technologies Germany GmbH
Original Assignee
Siemens AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=40010829&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2337642(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Siemens AG filed Critical Siemens AG
Priority to PL09782752T priority Critical patent/PL2337642T3/en
Priority to EP09782752.1A priority patent/EP2337642B2/en
Publication of EP2337642A2 publication Critical patent/EP2337642A2/en
Application granted granted Critical
Publication of EP2337642B1 publication Critical patent/EP2337642B1/en
Publication of EP2337642B2 publication Critical patent/EP2337642B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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 present invention relates to a descaling device
  • the descaling device has at least one Entzun- range
  • Descaling agent can be sprayed onto a metal strand to be descaled under high pressure
  • nozzles are connected to a high-pressure line system, via which the liquid descaling agent can be fed to the nozzles,
  • a pump driven by an electric motor is connected to the high-pressure line system, by means of which the liquid descaling device can be conveyed from a low-pressure supply network under high pressure into the high-pressure line system,
  • the pump is operated by means of the electric motor continuously and at constant speed. This is associated with a constant flow rate of the Entzu matters- means per unit time.
  • the nozzles in the at least one descaling area are switched through, ie spray the liquid descaling agent onto the metal strand to be descaled, this is not a problem.
  • the nozzles are switched off, the pumped quantity of the descaling agent has to be "consumed" elsewhere -Storage- device still has absorption capacity, the subsidized Entzu matterssstoff is taken into the high-pressure storage device. From there, it will be fed back into the high-pressure piping system at a later date.
  • a return valve is opened in the prior art. The descaling agent is returned to the low-pressure supply network via the return valve.
  • the object of the present invention is to develop a descaling device of the type mentioned in such a way that it is more economical to operate.
  • a descaling device of the aforementioned type is developed in such a way that the electric motor is connected to an electrical supply network via a converter, that the converter is connected in terms of control technology to a control device and that the control device is designed such that it controls the converter in such a way that the Electric motor is operated at variable speed.
  • the inventive design significantly reduces the operating costs of the descaling device. There is therefore an economical operation of the descaling device according to the invention, although the initial costs of the descaling device according to the invention are greater than the purchase costs of a descaling device of the prior art.
  • the converter is designed as a DC link converter.
  • the electric motor can be operated with greater dynamics.
  • control device is designed such that it controls the inverter such that the variable speed always remains above a minimum speed, which in turn is greater than zero.
  • control device is designed such that it controls the converter as a function of at least one of the following variables:
  • FIG. 1 shows schematically a plant of the metal-producing industry
  • FIG. 2 shows an electric motor and its connection to an electrical supply network
  • FIG. 3 shows by way of example a speed curve as a function of FIG
  • FIG. 4 shows schematically the operation of a control device.
  • a plant of the metal-producing industry has various plant components.
  • Are purely exemplary 1 shows a continuous casting plant 1 and a rolling mill 2.
  • a metal strand 3 is generated.
  • the metal strand 3 is rolled in the rolling mill 2.
  • the metal strand 3 is formed in many cases as a steel strand. However, this is not mandatory. Alternatively, the metal strand 3 could be formed, for example, as an aluminum strand, as a copper strand, as a brass strand, etc. Furthermore, the metal strand 3 is often formed as a metal strip. However, this is not absolutely necessary. Alternatively, the metal strand 3 may have, for example, a rod shape or a tubular shape.
  • the metal strand 3 is made of steel and is band-shaped, the metal strand 3 is thus designed as a steel strip, the plant of the metal-producing industry is often designed as a heavy plate mill.
  • a descaling device E is present.
  • the descaling device E has Entzu precises Suitee 4 to 6.
  • the Entzu concernings Colour 4 is the continuous casting 1 downstream.
  • the Entzu concernings Society 5 is upstream of the rolling mill 2.
  • the Entzu concernings Society 6 is downstream of the rolling mill 2.
  • each descaling section 4 to 6 has a number of nozzles 7 arranged in the respective descaling section 4 to 6.
  • a liquid descaling agent 8 is sprayed onto the metal strand 3 under high pressure in order to desalt the metal strand 3.
  • the liquid descaling agent 8 - usually water with or without additives - is supplied to the nozzles 7 via a high-pressure line system 9, to which the nozzles 7 are connected.
  • the Entzu matters Supershafte 4 to 6 are independently operable. According to the illustration of FIG. 1, this is achieved in that a respective main valve 10 is assigned to each descaling region 4 to 6, by means of which the supply of the descaling agent 8 to the respective descaling region 4 to 6 can be switched on and off.
  • the main valves 10 are independently switchable.
  • each descaling region 4 to 6 has a multiplicity of groups of nozzles 7, which can each be switched via a separate valve independently of all the other nozzles of the same and of the other desaturation regions 4 to 6.
  • this is in the context of the present invention of minor importance, so apart from a representation of the individual valves per group of nozzles 7.
  • the high-pressure line system 9 is fed via a pump 11, which is connected to the high-pressure line system 9.
  • the liquid descaler 8 is conveyed from a low-pressure supply network 12 under high pressure into the high-pressure line system 9.
  • the pump 11 is connected for this purpose with an electric motor 13 which drives the pump 11.
  • a high-pressure storage device 14 is further connected. From the high-pressure storage device 14, the high-pressure liquid Entzu matterssstoff 8 is bufferable.
  • the descaling device E is operated essentially as follows:
  • the operation of the descaling areas 4 to 6 takes place intermittently. For each descaling region 4 to 6, therefore, there is a phase during which the liquid descaling agent 8 is sprayed onto the metal strand 3. Likewise, there is a phase during which the liquid descaling agent 8 is not sprayed onto the metal strand 3.
  • a maximum delivery rate of the pump 11 is designed such that the maximum delivery rate is less than the maximum demand for Entzu precisesstoff 8.
  • the maximum capacity of the pump 11 and the capacity of the high-pressure storage device 14 are coordinated so that the need for liquid Entzu concerningsstoff 8, which is not covered by the maximum capacity of the pump 11, can be removed from the high-pressure storage device 14.
  • the pump 11 is driven by the electric motor 13, wherein the shortage of liquid descaling 8 is removed from the high-pressure storage device 14.
  • the high-pressure storage device 14 is replenished.
  • the electric motor 13 and with it the pump 11 are operated at a constant speed.
  • a return valve 15 must be opened, so that funded by the pump 11 Entzu concerningsstoff 8 from the high-pressure line system 9 and the high pressure Memory device 14 can be deducted.
  • the prior art electric motor 13 is operated continuously and at a constant speed, it is sufficient in the prior art for the electric motor 13 to be connected directly to an electrical supply network 16 (usually a rotary power network). In the embodiment according to the invention, however, the electric motor 13 is connected via an inverter 17 to the electrical supply network 16.
  • the inverter 17 may be formed in individual cases as a direct converter. However, it is preferred that the converter 17 is designed as a DC link converter in accordance with the embodiment shown in FIG. In this embodiment, the inverter 17 and with it the electric motor 13 with higher dynamics are operable.
  • the inverter 17 is connected to a control device 18 control technology.
  • the control device 18 is designed such that it controls the converter 17 such that the electric motor 13 is operated at a variable speed n.
  • 3 shows purely by way of example a profile of the rotational speed n of the electric motor 13 as a function of the time t. Obviously, the speed n varies over the time t. Regardless of the actual value of the rotational speed n, however, the rotational speed n is always above a minimum rotational speed nmin, which in turn is greater than zero. Furthermore, the speed n always remains below a maximum speed nmax. In particular, due to the fact that the rotational speed n always remains above the minimum rotational speed nmin, ie the electric motor 13 and the pump 11 rotate continuously, the wear can be minimized.
  • the control device 18 is usually designed as a software programmable control device. It can a drive state S of the inverter 17, which in turn the
  • Speed n of the electric motor 13 determines determined in various ways.
  • the control device 18 determines the control state S based on a Ist divellgrades F of the high-pressure storage device 14 in conjunction with a fixed Soll Shellgrad F * of the high-pressure storage device 14.
  • the controller 18 can realize a two- or multi-point controller. It is better, however, if the control device 18 takes into account the Ist Stahlllgrad F and other variables in determining the driving state.
  • control device 18 can use the other variables to determine the desired fill level F * as a function of the time t and to regulate the actual fill level F to the respective desired fill level F *.
  • control device 18 can determine the desired fill level F * as a function of an operating state B of at least one of the descaling regions 4 to 6.
  • the size of the time interval ⁇ t can also be taken into account in determining the desired fill level F *. From a cost point of view, it may also be useful to take into account a total load I of the electrical supply network 16 and / or a total load W of the low-pressure supply network 12 when determining the drive state S and / or the desired fill level F *.
  • the present invention has many advantages.
  • the descaling device E according to the invention is more cost-effective to operate than a comparable descaling device of the prior art.
  • the current load of the electrical supply network 16 is smaller than in the prior art.
  • the energy yield is improved.
  • the return valve 15 can be made smaller than is possible in the prior art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reciprocating Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

A descaling device (E) comprises at least one descaling zone (4 to 6) in which a number of nozzles (7) are arranged that allow a liquid descaling medium (8) to be sprayed at a high pressure onto a metal billet (3) which is to be descaled. The nozzles (7) are connected to a high-pressure pipe system (9) via which the liquid descaling medium (8) can be fed to the nozzles (7). A pump (11) which is driven by an electric motor (13) and allows the liquid descaling medium (8) to be conducted at a high pressure from a low-pressure supply network (12) into the high-pressure pipe system (9) is connected to the high-pressure pipe system (9). A high-pressure storage unit (14) from which the high-pressure liquid descaling medium (8) can be discharged is connected to the high-pressure pipe system (9). The electric motor (13) is connected to an electric power supply system (16) via a converter (17). The converter (17) is connected to a control device (18) for control purposes. The control device (18) is designed such that the same controls the converter (17) in such a way that the electric motor (13) is operated at a variable speed (n).

Description

Beschreibungdescription
Entzunderungseinrichtung mit drehzahlvariablem PumpenantriebDescaling device with variable-speed pump drive
Die vorliegende Erfindung betrifft eine Entzunderungseinrichtung,The present invention relates to a descaling device,
- wobei die Entzunderungseinrichtung mindestens einen Entzun- derungsbereich aufweist,- wherein the descaling device has at least one Entzun- range,
- wobei in dem mindestens einen Entzunderungsbereich eine An- zahl von Düsen angeordnet ist, mittels derer ein flüssiges- Wherein in the at least one descaling a number of nozzles is arranged, by means of which a liquid
Entzunderungsmittel unter Hochdruck auf einen zu entzundernden Metallstrang aufspritzbar ist,Descaling agent can be sprayed onto a metal strand to be descaled under high pressure,
- wobei die Düsen an ein Hochdruckleitungssystem angeschlossen sind, über welches den Düsen das flüssige Entzunde- rungsmittel zuführbar ist,wherein the nozzles are connected to a high-pressure line system, via which the liquid descaling agent can be fed to the nozzles,
- wobei an das Hochdruckleitungssystem eine mittels eines Elektromotors angetriebene Pumpe angeschlossen ist, mittels derer das flüssige Entzunderungsmittel aus einem Niederdruck-Versorgungsnetz unter Hochdruck in das Hochdrucklei- tungssystem förderbar ist,wherein a pump driven by an electric motor is connected to the high-pressure line system, by means of which the liquid descaling device can be conveyed from a low-pressure supply network under high pressure into the high-pressure line system,
- wobei an das Hochdruckleitungssystem eine Hochdruck-Speichereinrichtung angeschlossen ist, von der das unter Hochdruck stehende flüssige Entzunderungsmittel pufferbar ist.- Wherein the high-pressure line system, a high-pressure storage device is connected, of which the high-pressure liquid Entzunderungsmittel is bufferable.
Eine derartige Entzunderungseinrichtung ist in Fachkreisen allgemein bekannt.Such a descaling device is well known in the art.
Im Stand der Technik wird die Pumpe mittels des Elektromotors kontinuierlich und mit konstanter Drehzahl betrieben. Hiermit verbunden ist eine konstante Fördermenge des Entzunderungs- mittels pro Zeiteinheit.In the prior art, the pump is operated by means of the electric motor continuously and at constant speed. This is associated with a constant flow rate of the Entzunderungs- means per unit time.
Wenn die Düsen in dem mindestens einen Entzunderungsbereich durchgeschaltet sind, also das flüssige Entzunderungsmittel auf den zu entzundernden Metallstrang aufspritzen, stellt dies kein Problem dar. Wenn die Düsen hingegen abgeschaltet sind, muss die geförderte Menge des Entzunderungsmittels anderweitig „verbraucht" werden. Wenn die Hochdruck-Speicher- einrichtung noch Aufnahmekapazität aufweist, wird das geförderte Entzunderungsmittel in die Hochdruck-Speichereinrichtung übernommen. Von dort wird sie zu einem späteren Zeitpunkt wieder in das Hochdruckleitungssystem eingespeist. Wenn hingegen auch die Hochdruck-Speichereinrichtung gefüllt ist, wird im Stand der Technik ein Rückführventil geöffnet. Über das Rückführventil wird das Entzunderungsmittel in das Niederdruck-Versorgungsnetz zurückgeführt .If the nozzles in the at least one descaling area are switched through, ie spray the liquid descaling agent onto the metal strand to be descaled, this is not a problem. On the other hand, if the nozzles are switched off, the pumped quantity of the descaling agent has to be "consumed" elsewhere -Storage- device still has absorption capacity, the subsidized Entzunderungsmittel is taken into the high-pressure storage device. From there, it will be fed back into the high-pressure piping system at a later date. In contrast, when the high-pressure storage device is filled, a return valve is opened in the prior art. The descaling agent is returned to the low-pressure supply network via the return valve.
Die Aufgabe der vorliegenden Erfindung besteht darin, eine Entzunderungseinrichtung der eingangs genannten Art derart weiter zu entwickeln, dass sie wirtschaftlicher betreibbar ist .The object of the present invention is to develop a descaling device of the type mentioned in such a way that it is more economical to operate.
Die Aufgabe wird durch eine Entzunderungseinrichtung mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Ausgestaltungen der Entzunderungseinrichtung sind Gegenstand der abhängigen Ansprüche 2 bis 4.The object is achieved by a descaling device having the features of claim 1. Advantageous embodiments of the descaling device are the subject of the dependent claims 2 to 4.
Erfindungsgemäß ist eine Entzunderungseinrichtung der eingangs genannten Art derart weitergebildet, dass der Elektromotor über einen Umrichter an ein elektrisches Versorgungsnetz angeschlossen ist, dass der Umrichter mit einer Steuereinrichtung steuerungstechnisch verbunden ist und dass die Steuereinrichtung derart ausgebildet ist, dass sie den Umrichter derart ansteuert, dass der Elektromotor mit variabler Drehzahl betrieben wird.According to the invention, a descaling device of the aforementioned type is developed in such a way that the electric motor is connected to an electrical supply network via a converter, that the converter is connected in terms of control technology to a control device and that the control device is designed such that it controls the converter in such a way that the Electric motor is operated at variable speed.
Durch die erfindungsgemäße Ausgestaltung werden die Betriebs- kosten der Entzunderungseinrichtung deutlich reduziert. Es ergibt sich daher ein wirtschaftlicher Betrieb der erfindungsgemäßen Entzunderungseinrichtung, obwohl die Anschaffungskosten der erfindungsgemäßen Entzunderungseinrichtung größer sind als die Anschaffungskosten einer Entzunderungs- einrichtung des Standes der Technik.The inventive design significantly reduces the operating costs of the descaling device. There is therefore an economical operation of the descaling device according to the invention, although the initial costs of the descaling device according to the invention are greater than the purchase costs of a descaling device of the prior art.
In einer bevorzugten Ausgestaltung der vorliegenden Erfindung ist der Umrichter als Zwischenkreisumrichter ausgebildet. Bei dieser Ausgestaltung ist der Elektromotor mit einer größeren Dynamik betreibbar.In a preferred embodiment of the present invention, the converter is designed as a DC link converter. at In this embodiment, the electric motor can be operated with greater dynamics.
Weiterhin ist bevorzugt, dass die Steuereinrichtung derart ausgebildet ist, dass sie den Umrichter derart ansteuert, dass die variable Drehzahl stets oberhalb einer Minimaldrehzahl bleibt, die ihrerseits größer als Null ist. Durch diese Ausgestaltung kann der Verschleiß - insbesondere in den Lagern des Elektromotors und der Pumpe - minimiert werden.Furthermore, it is preferred that the control device is designed such that it controls the inverter such that the variable speed always remains above a minimum speed, which in turn is greater than zero. By this configuration, the wear - especially in the bearings of the electric motor and the pump - can be minimized.
Vorzugsweise ist die Steuereinrichtung derart ausgebildet ist, dass sie den Umrichter in Abhängigkeit von mindestens einer der folgenden Größen ansteuert:Preferably, the control device is designed such that it controls the converter as a function of at least one of the following variables:
- einem Sollfüllgrad der Hochdruck-Speichereinrichtung, - einem Istfüllgrad der Hochdruck-Speichereinrichtung,a desired filling level of the high-pressure storage device, an actual filling level of the high-pressure storage device,
- einem Betriebszustand des mindestens einen Entzunderungsbe- reichs,an operating state of the at least one descaling area,
- einer noch zu vergehenden Zeitspanne bis zum Beginn eines EntzünderungsVorgangs, - einer Gesamtbelastung des elektrischen Versorgungsnetzes und- A time still to pass until the beginning of a Entzünderungsvorgangs, - A total load of the electrical supply network and
- einer Gesamtbelastung des Niederdruck-Versorgungsnetzes.- a total load of the low-pressure supply network.
Weitere Vorteile und Einzelheiten ergeben sich aus der nach- folgenden Beschreibung eines Ausführungsbeispiels in Verbindung mit den Zeichnungen. Es zeigen in Prinzipdarstellung:Further advantages and details will become apparent from the following description of an embodiment in conjunction with the drawings. In a schematic representation:
FIG 1 schematisch eine Anlage der metallerzeugenden Industrie, FIG 2 einen Elektromotor und dessen Anschaltung an ein elektrisches Versorgungsnetz, FIG 3 beispielhaft einen Drehzahlverlauf als Funktion der1 shows schematically a plant of the metal-producing industry, FIG. 2 shows an electric motor and its connection to an electrical supply network, FIG. 3 shows by way of example a speed curve as a function of FIG
Zeit undtime and
FIG 4 schematisch die Wirkungsweise einer Steuereinrich- tung.4 shows schematically the operation of a control device.
Gemäß FIG 1 weist eine Anlage der metallerzeugenden Industrie verschiedene Anlagenkomponenten auf. Rein beispielhaft sind in FIG 1 eine Stranggießanlage 1 und ein Walzwerk 2 dargestellt. In der Stranggießanlage wird ein Metallstrang 3 erzeugt. Der Metallstrang 3 wird im Walzwerk 2 gewalzt.According to FIG. 1, a plant of the metal-producing industry has various plant components. Are purely exemplary 1 shows a continuous casting plant 1 and a rolling mill 2. In the continuous casting a metal strand 3 is generated. The metal strand 3 is rolled in the rolling mill 2.
Der Metallstrang 3 ist in vielen Fällen als Stahlstrang ausgebildet. Dies ist jedoch nicht zwingend erforderlich. Alternativ könnte der Metallstrang 3 beispielsweise als Aluminiumstrang, als Kupferstrang, als Messingstrang usw. ausgebildet sein. Weiterhin ist der Metallstrang 3 oftmals als Metallband ausgebildet. Auch dies ist jedoch nicht zwingend erforderlich. Alternativ kann der Metallstrang 3 beispielsweise eine Stabform oder eine Rohrform aufweisen.The metal strand 3 is formed in many cases as a steel strand. However, this is not mandatory. Alternatively, the metal strand 3 could be formed, for example, as an aluminum strand, as a copper strand, as a brass strand, etc. Furthermore, the metal strand 3 is often formed as a metal strip. However, this is not absolutely necessary. Alternatively, the metal strand 3 may have, for example, a rod shape or a tubular shape.
Insbesondere in dem Fall, dass der Metallstrang 3 aus Stahl besteht und bandförmig ausgebildet ist, der Metallstrang 3 also als Stahlband ausgebildet ist, ist die Anlage der metallerzeugenden Industrie oftmals als Grobblechstraße ausgebildet .In particular, in the case that the metal strand 3 is made of steel and is band-shaped, the metal strand 3 is thus designed as a steel strip, the plant of the metal-producing industry is often designed as a heavy plate mill.
Nach dem Erzeugen des Metallstrangs 3, vor dem Walzen des Metallstrangs 3 und/oder nach dem Walzen des Metallstrangs 3 ist in vielen Fällen eine Entzunderung erforderlich. Zu diesem Zweck ist eine Entzunderungseinrichtung E vorhanden.After the metal strand 3 has been produced, before the rolling of the metal strand 3 and / or after the rolling of the metal strand 3, descaling is required in many cases. For this purpose, a descaling device E is present.
Die Entzunderungseinrichtung E weist Entzunderungsbereiche 4 bis 6 auf. Der Entzunderungsbereich 4 ist der Stranggießanlage 1 nachgeordnet. Der Entzunderungsbereich 5 ist dem Walzwerk 2 vorgeordnet. Der Entzunderungsbereich 6 ist dem Walzwerk 2 nachgeordnet.The descaling device E has Entzunderungsbereiche 4 to 6. The Entzunderungsbereich 4 is the continuous casting 1 downstream. The Entzunderungsbereich 5 is upstream of the rolling mill 2. The Entzunderungsbereich 6 is downstream of the rolling mill 2.
Gemäß der Darstellung von FIG 1 sind alle drei Entzunderungsbereiche 4 bis 6 vorhanden. Dies ist jedoch nicht zwingend erforderlich. In anderen Ausgestaltungen der Entzunderungseinrichtung E ist es möglich, dass nur zwei oder im Extrem- fall sogar nur einer der Entzunderungsbereiche 4 bis 6 vorhanden ist. Jeder Entzunderungsbereich 4 bis 6 weist eine Anzahl von Düsen 7 auf, die im jeweiligen Entzunderungsbereich 4 bis 6 angeordnet sind. Mittels der Düsen 7 wird im Betrieb des jeweiligen Entzunderungsbereichs 4 bis 6 ein flüssiges Entzunde- rungsmittel 8 unter Hochdruck auf den Metallstrang 3 aufgespritzt, um den Metallstrang 3 zu entzundern. Das flüssige Entzunderungsmittel 8 - in der Regel Wasser mit oder ohne Zusätze - wird den Düsen 7 über ein Hochdruckleitungssystem 9 zugeführt, an das die Düsen 7 angeschlossen sind.As shown in FIG. 1, all three descaling regions 4 to 6 are present. However, this is not mandatory. In other embodiments of the descaling device E, it is possible that only two or, in the extreme case, only one of the descaling regions 4 to 6 is present. Each descaling section 4 to 6 has a number of nozzles 7 arranged in the respective descaling section 4 to 6. By means of the nozzles 7, during operation of the respective descaling region 4 to 6, a liquid descaling agent 8 is sprayed onto the metal strand 3 under high pressure in order to desalt the metal strand 3. The liquid descaling agent 8 - usually water with or without additives - is supplied to the nozzles 7 via a high-pressure line system 9, to which the nozzles 7 are connected.
Die Entzunderungsbereiche 4 bis 6 sind unabhängig voneinander betreibbar. Gemäß der Darstellung von FIG 1 wird dies dadurch erreicht, dass jedem Entzunderungsbereich 4 bis 6 jeweils ein Hauptventil 10 zugeordnet ist, mittels dessen die Zufuhr des Entzunderungsmittels 8 zum jeweiligen Entzunderungsbereich 4 bis 6 zu- und abschaltbar ist. Die Hauptventile 10 sind unabhängig voneinander schaltbar.The Entzunderungsbereiche 4 to 6 are independently operable. According to the illustration of FIG. 1, this is achieved in that a respective main valve 10 is assigned to each descaling region 4 to 6, by means of which the supply of the descaling agent 8 to the respective descaling region 4 to 6 can be switched on and off. The main valves 10 are independently switchable.
Die zuletzt erläuterte Ausgestaltung (ein einziges Hauptven- til 10 pro Entzunderungsbereich 4 bis 6) ist lediglich der einfacheren Darstellbarkeit so gewählt. In der Regel weist jeder Entzunderungsbereich 4 bis 6 eine Vielzahl von Gruppen von Düsen 7 auf, die jeweils über ein eigenes Ventil unabhängig von allen anderen Düsen desselben und der anderen Entzun- derungsbereiche 4 bis 6 schaltbar sind. Dies ist im Rahmen der vorliegenden Erfindung jedoch von untergeordneter Bedeutung, so dass von einer Darstellung der einzelnen Ventile pro Gruppe von Düsen 7 abgesehen wird.The last-explained embodiment (a single main valve 10 per Entzunderungsbereich 4 to 6) is chosen only for ease of representation so. As a rule, each descaling region 4 to 6 has a multiplicity of groups of nozzles 7, which can each be switched via a separate valve independently of all the other nozzles of the same and of the other desaturation regions 4 to 6. However, this is in the context of the present invention of minor importance, so apart from a representation of the individual valves per group of nozzles 7.
Das Hochdruckleitungssystem 9 wird über eine Pumpe 11 gespeist, die an das Hochdruckleitungssystem 9 angeschlossen ist. Mittels der Pumpe 11 wird das flüssige Entzunderungsmittel 8 aus einem Niederdruck-Versorgungsnetz 12 unter Hochdruck in das Hochdruckleitungssystem 9 gefördert. Die Pumpe 11 ist zu diesem Zweck mit einem Elektromotor 13 verbunden, der die Pumpe 11 antreibt. An das Hochdruckleitungssystem 9 ist weiterhin eine Hochdruck-Speichereinrichtung 14 angeschlossen. Von der Hochdruck-Speichereinrichtung 14 ist das unter Hochdruck stehende flüssige Entzunderungsmittel 8 pufferbar.The high-pressure line system 9 is fed via a pump 11, which is connected to the high-pressure line system 9. By means of the pump 11, the liquid descaler 8 is conveyed from a low-pressure supply network 12 under high pressure into the high-pressure line system 9. The pump 11 is connected for this purpose with an electric motor 13 which drives the pump 11. To the high-pressure line system 9, a high-pressure storage device 14 is further connected. From the high-pressure storage device 14, the high-pressure liquid Entzunderungsmittel 8 is bufferable.
Die Entzunderungseinrichtung E wird im Wesentlichen wie folgt betrieben :The descaling device E is operated essentially as follows:
Der Betrieb der Entzunderungsbereiche 4 bis 6 erfolgt inter- mittierend. Für jeden Entzunderungsbereich 4 bis 6 existiert daher eine Phase, während derer das flüssige Entzunderungsmittel 8 auf den Metallstrang 3 aufgespritzt wird. Ebenso existiert eine Phase, während derer das flüssige Entzunderungsmittel 8 nicht auf den Metallstrang 3 aufgespritzt wird.The operation of the descaling areas 4 to 6 takes place intermittently. For each descaling region 4 to 6, therefore, there is a phase during which the liquid descaling agent 8 is sprayed onto the metal strand 3. Likewise, there is a phase during which the liquid descaling agent 8 is not sprayed onto the metal strand 3.
Eine maximale Förderleistung der Pumpe 11 ist derart ausgelegt, dass die maximale Förderleistung kleiner als der maximale Bedarf an Entzunderungsmittel 8 ist. Die maximale Förderleistung der Pumpe 11 und die Kapazität der Hochdruck- Speichereinrichtung 14 sind jedoch derart aufeinander abgestimmt, dass der Bedarf an flüssigem Entzunderungsmittel 8, der durch die maximale Förderleistung der Pumpe 11 nicht gedeckt ist, aus der Hochdruck-Speichereinrichtung 14 entnommen werden kann. Während der Entzunderungsphasen wird also die Pumpe 11 mittels des Elektromotors 13 angetrieben, wobei das Bedarfsdefizit an flüssigem Entzunderungsmittel 8 aus der Hochdruck-Speichereinrichtung 14 entnommen wird. Während der Phasen, in denen keine Entzunderung erfolgt, wird die Hochdruck-Speichereinrichtung 14 wieder aufgefüllt.A maximum delivery rate of the pump 11 is designed such that the maximum delivery rate is less than the maximum demand for Entzunderungsmittel 8. However, the maximum capacity of the pump 11 and the capacity of the high-pressure storage device 14 are coordinated so that the need for liquid Entzunderungsmittel 8, which is not covered by the maximum capacity of the pump 11, can be removed from the high-pressure storage device 14. During the Entzunderungsphasen so the pump 11 is driven by the electric motor 13, wherein the shortage of liquid descaling 8 is removed from the high-pressure storage device 14. During the phases in which no descaling occurs, the high-pressure storage device 14 is replenished.
Im Stand der Technik werden der Elektromotor 13 und mit ihm die Pumpe 11 mit konstanter Drehzahl betrieben. Wenn die Hochdruck-Speichereinrichtung 14 gefüllt ist und eine Zeitspanne δt bis zum Beginn des nächsten Entzunderungsvorgangs verbleibt, muss daher im Stand der Technik ein Rückführventil 15 geöffnet werden, damit das von der Pumpe 11 geförderte Entzunderungsmittel 8 aus dem Hochdruck-Leitungssystem 9 und der Hochdruck-Speichereinrichtung 14 abgezogen werden kann. Da der Elektromotor 13 im Stand der Technik kontinuierlich und mit konstanter Drehzahl betrieben wird, ist es im Stand der Technik ausreichend, wenn der Elektromotor 13 direkt an ein elektrisches Versorgungsnetz 16 (in der Regel ein Dreh- Stromnetz) angeschlossen ist. Bei der erfindungsgemäßen Ausgestaltung hingegen ist der Elektromotor 13 über einen Umrichter 17 an das elektrische Versorgungsnetz 16 angeschlossen .In the prior art, the electric motor 13 and with it the pump 11 are operated at a constant speed. When the high-pressure storage device 14 is filled and a period of time δt remains until the beginning of the next Entzunderungsvorgangs, therefore, in the prior art, a return valve 15 must be opened, so that funded by the pump 11 Entzunderungsmittel 8 from the high-pressure line system 9 and the high pressure Memory device 14 can be deducted. Since the prior art electric motor 13 is operated continuously and at a constant speed, it is sufficient in the prior art for the electric motor 13 to be connected directly to an electrical supply network 16 (usually a rotary power network). In the embodiment according to the invention, however, the electric motor 13 is connected via an inverter 17 to the electrical supply network 16.
Der Umrichter 17 kann in Einzelfällen als Direktumrichter ausgebildet sein. Bevorzugt ist jedoch, dass der Umrichter 17 entsprechend der in FIG 2 dargestellten Ausgestaltung als Zwischenkreisumrichter ausgebildet ist. In dieser Ausgestaltung sind der Umrichter 17 und mit ihm der Elektromotor 13 mit höherer Dynamik betreibbar.The inverter 17 may be formed in individual cases as a direct converter. However, it is preferred that the converter 17 is designed as a DC link converter in accordance with the embodiment shown in FIG. In this embodiment, the inverter 17 and with it the electric motor 13 with higher dynamics are operable.
Der Umrichter 17 ist mit einer Steuereinrichtung 18 steuerungstechnisch verbunden. Die Steuereinrichtung 18 ist derart ausgebildet, dass sie den Umrichter 17 derart ansteuert, dass der Elektromotor 13 mit einer variablen Drehzahl n betrieben wird. FIG 3 zeigt rein beispielhaft einen Verlauf der Drehzahl n des Elektromotors 13 als Funktion der Zeit t. Ersichtlich variiert die Drehzahl n über der Zeit t. Unabhängig vom konkreten Wert der Drehzahl n ist die Drehzahl n jedoch stets oberhalb einer Minimaldrehzahl nmin, die ihrerseits größer als Null ist. Weiterhin bleibt die Drehzahl n stets unterhalb einer Maximaldrehzahl nmax . Insbesondere auf Grund des Um- stands, dass die Drehzahl n stets oberhalb der Minimaldrehzahl nmin bleibt, der Elektromotor 13 und die Pumpe 11 also kontinuierlich rotieren, kann der Verschleiß minimiert werden .The inverter 17 is connected to a control device 18 control technology. The control device 18 is designed such that it controls the converter 17 such that the electric motor 13 is operated at a variable speed n. 3 shows purely by way of example a profile of the rotational speed n of the electric motor 13 as a function of the time t. Obviously, the speed n varies over the time t. Regardless of the actual value of the rotational speed n, however, the rotational speed n is always above a minimum rotational speed nmin, which in turn is greater than zero. Furthermore, the speed n always remains below a maximum speed nmax. In particular, due to the fact that the rotational speed n always remains above the minimum rotational speed nmin, ie the electric motor 13 and the pump 11 rotate continuously, the wear can be minimized.
Die Steuereinrichtung 18 ist in der Regel als softwareprogrammierbare Steuereinrichtung ausgebildet. Sie kann einen Ansteuerzustand S des Umrichters 17, der seinerseits dieThe control device 18 is usually designed as a software programmable control device. It can a drive state S of the inverter 17, which in turn the
Drehzahl n des Elektromotors 13 bestimmt, auf verschiedene Art und Weise bestimmen. In der einfachsten Ausgestaltung ermittelt die Steuereinrichtung 18 den Ansteuerzustand S anhand eines Istfüllgrades F der Hochdruck-Speichereinrichtung 14 in Verbindung mit einem festen Sollfüllgrad F* der Hochdruck-Speichereinrichtung 14. Beispielsweise kann die Steuereinrichtung 18 einen Zwei- oder Mehrpunktregler realisieren. Besser ist es jedoch, wenn die Steuereinrichtung 18 bei der Ermittlung des Ansteuerzustands S den Istfüllgrad F und weitere Größen berücksichtigt.Speed n of the electric motor 13 determines determined in various ways. In the simplest embodiment, the control device 18 determines the control state S based on a Istfüllgrades F of the high-pressure storage device 14 in conjunction with a fixed Sollfüllgrad F * of the high-pressure storage device 14. For example, the controller 18 can realize a two- or multi-point controller. It is better, however, if the control device 18 takes into account the Istfüllgrad F and other variables in determining the driving state.
Beispielsweise kann die Steuereinrichtung 18 anhand der weiteren Größen den Sollfüllgrad F* als Funktion der Zeit t ermitteln und den Istfüllgrad F auf den jeweiligen Sollfüllgrad F* regeln.For example, the control device 18 can use the other variables to determine the desired fill level F * as a function of the time t and to regulate the actual fill level F to the respective desired fill level F *.
Weiterhin kann beispielsweise die Steuereinrichtung 18 den Sollfüllgrad F* in Abhängigkeit von einem Betriebszustand B mindestens eines der Entzunderungsbereiche 4 bis 6 ermitteln. Insbesondere in dem Fall, dass die Zeitspanne δt bis zum Beginn des nächsten Entzunderungsvorgangs bekannt ist, kann insbesondere auch die Größe der Zeitspanne δt bei der Ermittlung des Sollfüllgrades F* berücksichtigt werden. Unter Kostengesichtspunkten kann es weiterhin sinnvoll sein, bei der Ermittlung des Ansteuerzustands S und/oder des Sollfüllgrades F* eine Gesamtbelastung I des elektrischen Versorgungsnetzes 16 und/oder eine Gesamtbelastung W des Niederdruck-Versorgungsnetzes 12 zu berücksichtigen.Furthermore, for example, the control device 18 can determine the desired fill level F * as a function of an operating state B of at least one of the descaling regions 4 to 6. In particular, in the case that the period of time δt is known until the beginning of the next descaling process, the size of the time interval Δt can also be taken into account in determining the desired fill level F *. From a cost point of view, it may also be useful to take into account a total load I of the electrical supply network 16 and / or a total load W of the low-pressure supply network 12 when determining the drive state S and / or the desired fill level F *.
Die vorliegende Erfindung weist viele Vorteile auf. Insbesondere ist die erfindungsgemäße Entzunderungseinrichtung E kos- tengünstiger betreibbar als eine vergleichbare Entzunderungseinrichtung des Standes der Technik. Weiterhin ergibt sich ein geringerer Verschleiß. Die Strombelastung des elektrischen Versorgungsnetzes 16 ist kleiner als im Stand der Technik. Die Energieausbeute wird verbessert. Weiterhin ergibt sich eine größere Lebensdauer von Elektromotor 13 und Pumpe 11. Schließlich kann das Rückführventil 15 kleiner dimensioniert werden, als dies im Stand der Technik möglich ist. Die obige Beschreibung dient ausschließlich der Erläuterung der vorliegenden Erfindung. Der Schutzumfang der vorliegenden Erfindung soll hingegen ausschließlich durch die beigefügten Ansprüche bestimmt sein. The present invention has many advantages. In particular, the descaling device E according to the invention is more cost-effective to operate than a comparable descaling device of the prior art. Furthermore, there is less wear. The current load of the electrical supply network 16 is smaller than in the prior art. The energy yield is improved. Furthermore, there is a longer service life of electric motor 13 and pump 11. Finally, the return valve 15 can be made smaller than is possible in the prior art. 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

Patentansprüche claims
1. Entzunderungseinrichtung,1. descaling device,
- wobei die Entzunderungseinrichtung mindestens einen Entzun- derungsbereich (4 bis 6) aufweist,- Wherein the descaling device has at least one Entzun- derungsbereich (4 to 6),
- wobei in dem mindestens einen Entzunderungsbereich (4 bis 6) eine Anzahl von Düsen (7) angeordnet ist, mittels derer ein flüssiges Entzunderungsmittel (8) unter Hochdruck auf einen zu entzundernden Metallstrang (3) aufspritzbar ist, - wobei die Düsen (7) an ein Hochdruckleitungssystem (9) angeschlossen sind, über welches den Düsen (7) das flüssige Entzunderungsmittel (8) zuführbar ist,- wherein in the at least one Entzunderungsbereich (4 to 6) a number of nozzles (7) is arranged, by means of which a liquid Entzunderungsmittel (8) can be sprayed under high pressure on a metal strand to be descaled (3), - wherein the nozzles (7) are connected to a high-pressure line system (9), via which the nozzles (7), the liquid Entzunderungsmittel (8) can be supplied,
- wobei an das Hochdruckleitungssystem (9) eine mittels eines Elektromotors (13) angetriebene Pumpe (11) angeschlossen ist, mittels derer das flüssige Entzunderungsmittel (8) aus einem Niederdruck-Versorgungsnetz (12) unter Hochdruck in das Hochdruckleitungssystem (9) förderbar ist,- wherein to the high pressure line system (9) by means of an electric motor (13) driven pump (11) is connected, by means of which the liquid Entzunderungsmittel (8) from a low pressure supply network (12) under high pressure in the high pressure line system (9) is conveyed
- wobei an das Hochdruckleitungssystem (9) eine Hochdruck- Speichereinrichtung (14) angeschlossen ist, von der das un- ter Hochdruck stehende flüssige Entzunderungsmittel (8) pufferbar ist, dadurch gekennzeichnet, dass der Elektromotor (13) über einen Umrichter (17) an ein elektrisches Versorgungsnetz (16) angeschlossen ist, dass der Umrichter (17) mit einer Steuereinrichtung (18) steuerungstechnisch verbunden ist und dass die Steuereinrichtung (18) derart ausgebildet ist, dass sie den Umrichter (17) derart ansteuert, dass der Elektromotor (13) mit variabler Drehzahl (n) betrieben wird.- Wherein the high-pressure line system (9) a high-pressure storage device (14) is connected, from which the under high pressure liquid Entzunderungsmittel (8) can be buffered, characterized in that the electric motor (13) via an inverter (17) an electrical power supply network (16) is connected, that the converter (17) is connected to a control device (18) and that the control device (18) is designed such that it controls the converter (17) in such a way that the electric motor (13 ) is operated at variable speed (s).
2. Entzunderungseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Umrichter (17) als Zwi- schenkreisumrichter ausgebildet ist.2. descaling device according to claim 1, characterized in that the converter (17) is designed as a Zwenkenkreisumrichter.
3. Entzunderungseinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Steuereinrichtung (18) derart ausgebildet ist, dass sie den Umrichter (17) derart ansteuert, dass die variable Drehzahl (n) stets oberhalb einer Minimaldrehzahl (nmin) bleibt, die ihrerseits größer als Null ist .3. descaling device according to claim 1 or 2, characterized in that the control device (18) is designed such that it controls the inverter (17) such that the variable speed (s) always above a Minimum speed (nmin) remains, which in turn is greater than zero.
4. Entzunderungseinrichtung nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass die Steuereinrichtung (18) derart ausgebildet ist, dass sie den Umrichter (17) in Abhängigkeit von mindestens einer der folgenden Größen ansteuert:4. descaling device according to claim 1, 2 or 3, characterized in that the control device (18) is designed such that it controls the inverter (17) in dependence on at least one of the following variables:
- einem Sollfüllgrad (F*) der Hochdruck-Speichereinrichtung- A Sollfüllgrad (F *) of the high-pressure storage device
(14), - einem Istfüllgrad (F) der Hochdruck-Speichereinrichtung (14),(14), - a Istfüllgrad (F) of the high-pressure storage device (14),
- einem Betriebszustand (B) des mindestens einen Entzunde- rungsbereichs (4 bis 6) ,an operating state (B) of the at least one descaling region (4 to 6),
- einer noch zu vergehenden Zeitspanne (δt) bis zum Beginn eines Entzunderungsvorgangs,an elapsed time (δt) until the beginning of a descaling process,
- einer Gesamtbelastung (I) des elektrischen Versorgungsnetzes (16) und- A total load (I) of the electrical supply network (16) and
- einer Gesamtbelastung (W) des Niederdruck-Versorgungsnetzes- a total load (W) of the low-pressure supply network
(12) . (12).
EP09782752.1A 2008-10-07 2009-09-08 Ignition device with pump drive with variable speed Active EP2337642B2 (en)

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PL09782752T PL2337642T3 (en) 2008-10-07 2009-09-08 Ignition device with pump drive with variable speed
EP09782752.1A EP2337642B2 (en) 2008-10-07 2009-09-08 Ignition device with pump drive with variable speed

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EP08017562A EP2174729A1 (en) 2008-10-07 2008-10-07 Ignition device with pump drive with variable speed
EP09782752.1A EP2337642B2 (en) 2008-10-07 2009-09-08 Ignition device with pump drive with variable speed
PCT/EP2009/061617 WO2010040614A2 (en) 2008-10-07 2009-09-08 Descaling device comprising a pump drive operated at a variable speed

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EP2174729A1 (en) 2010-04-14
CN102176984B (en) 2013-11-20
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EP2337642B2 (en) 2017-07-26
PL2337642T3 (en) 2014-04-30
EP2337642B1 (en) 2013-11-13
CN102176984A (en) 2011-09-07

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