WO2010040614A2 - Descaling device comprising a pump drive operated at a variable speed - Google Patents

Descaling device comprising a pump drive operated at a variable speed Download PDF

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Publication number
WO2010040614A2
WO2010040614A2 PCT/EP2009/061617 EP2009061617W WO2010040614A2 WO 2010040614 A2 WO2010040614 A2 WO 2010040614A2 EP 2009061617 W EP2009061617 W EP 2009061617W WO 2010040614 A2 WO2010040614 A2 WO 2010040614A2
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WO
Grant status
Application
Patent type
Prior art keywords
descaling
high
pressure
connected
electric motor
Prior art date
Application number
PCT/EP2009/061617
Other languages
German (de)
French (fr)
Other versions
WO2010040614A3 (en )
Inventor
Guido Bodden
Jochen Wermke
Original Assignee
Siemens Aktiengesellschaft
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

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04Devices 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
    • B21B45/08Devices 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

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

description

Descaling with variable speed pump drive

The present invention relates to a descaling device,

- wherein the descaling device comprises at least one descaling for area,

- wherein a check is arranged number of nozzles in the at least one descaler area, by means of which a liquid

Descaling is aufspritzbar under high pressure to a metal strand to be descaled,

- wherein the nozzles are connected to a high-pressure line system, via which the nozzle the liquid descaling agent is fed,

- wherein to the high-pressure line system, an electric motor driven by means of a pump is connected, by means of which the liquid descaling of a low-pressure supply network is conveyed under high pressure into the high-pressure line system,

- wherein to the high-pressure line system, a high-pressure storage device is connected, from which the liquid under high pressure descaling is cacheable.

Such a descaling device is generally known in the art.

In the prior art, the pump is operated by the electric motor continuously and at constant speed. This is associated with a constant flow rate of descaling means per unit time.

When the nozzle a descaler area are switched through in the least, so spraying the liquid descaling to be descaled metal strand, this is not a problem. When the nozzle, however, are turned off, the conveyed amount of the descaling If must otherwise be "consumed". The high pressure storage-device still has absorption capacity, the conveyed descaling is transferred into the high pressure storage means. From there it is fed to a later time in the high-pressure piping system. in contrast, when the high-pressure storage device is filled, in the prior art is a return valve opened. About the recirculation valve, the descaling is returned to the low pressure supply network.

The object of the present invention is to develop a descaling device of the type mentioned in the further, that it is economically operable.

The object is achieved by a descaling device having the features of claim 1. Advantageous embodiments of the descaling device are subject of the dependent claims 2 to. 4

According to the invention a descaling device of the aforementioned type is further formed such that the electric motor via a converter is connected to an electric utility grid, the inverter having a control device is control technology, and in that the control device is designed such that it controls the inverter such that the electric motor is operated with variable speed.

The inventive design, the operating costs are the descaling significantly reduced. Therefore, there is an economical operation of the descaling device according to the invention, although the cost of the descaling device according to the invention are greater than the cost of a descaling device of the prior art.

In a preferred embodiment of the present invention, the inverter is constructed as indirect converter. In this embodiment, the electric motor having a greater dynamic is operable.

It is further preferred that the control device is designed such that it activates the converter so that the variable speed always remains above a minimum speed, which in turn is greater than zero. By this configuration, the wear can - in particular in the bearings of the electric motor and the pump - can be minimized.

Preferably, the control device is designed such that it drives the inverter as a function of at least one of the following variables:

- a Sollfüllgrad the high-pressure storage device, - a Istfüllgrad the high-pressure storage means,

- an operating state of the kingdom a Entzunderungsbe- minimum

- a still time passing time until the beginning of EntzünderungsVorgangs, - a total load on the electrical supply network and

- a total load of the low-pressure supply system.

Further advantages and details result from the following description of an embodiment taken in conjunction with the drawings. These show, in schematic diagram:

1 schematically shows a plant of the metal-producing industry, Figure 2 shows an electric motor and its connection to an electrical supply network, FIG 3 an example of a speed profile as a function of the

time and

4 shows schematically the operation of a processing Steuereinrich-.

According to FIG 1 comprises a plant of the metal-producing industry in a variety of system components. For example only, a continuous casting 1 and a mill 2 are shown in Fig. 1 In the continuous casting a metal strip 3 is generated. The metal strip 3 is rolled in the rolling mill. 2

The metal strip 3 is formed as a steel strand in many cases. However, this is not mandatory. Alternatively, the metal strip 3 could be formed for example as extruded aluminum, as copper strand as brass etc. strand. Furthermore, the metal strip 3 is often formed as a metal strip. However, this is not mandatory. Alternatively, the metal strip may have a rod shape or a tubular shape 3, for example.

is thus formed as a steel strip in particular in the case that the metal strip 3 is made of steel and is band-shaped, the metal strip 3, the contact of the metal-producing industry is often formed as a plate mill.

After the production of the metal strip 3, before rolling of the metal strip 3 and / or after rolling of the metal strip 3 in many cases, a descaling is required. For this purpose, a descaling E present.

The descaling E has Entzunderungsbereiche 4 to 6. The descaler area 4 is arranged downstream of the continuous casting. 1 The descaler 5 is disposed upstream of the rolling mill. 2 The descaler 6 is arranged downstream of the rolling mill. 2

According to the illustration of FIG 1, all three Entzunderungsbereiche 4 to 6 are provided. However, this is not mandatory. In other embodiments, the descaling E, it is possible that only two or, in extreme cases even only one of the Entzunderungsbereiche 4 to 6 present. Each descaler 4 to 6 has a number of nozzles 7, which are arranged in the respective descaler 4 to 6. By means of the nozzle 7 is in operation the respective Entzunderungsbereichs 4 to 6, a liquid descaling agent 8 sprayed under high pressure on the metal strand 3 in order to descale the metal strand. 3 The liquid descaling 8 - usually water with or without additives - is the nozzles 7 fed via a high-pressure pipeline system 9 to which the nozzles are connected. 7

The Entzunderungsbereiche 4 to 6 are independently operable. According to the illustration in FIG 1, this is achieved in that each of the descaling is 4 to 6 each associated with a main valve 10, inlet means of which the supply of the descaling 8 for each descaler 4 to 6 and can be switched off. The main valves 10 are independently switchable.

The last-mentioned embodiment (a single Hauptven- til 10 per descaler 4 to 6) of the simpler representability is merely chosen so on. In general, each descaler 4 to 6 a plurality of groups of nozzles 7, the same in each case its own valve independent of all other nozzles and the other descaling for areas 4 to 6 are switchable. This is, however, so apart in the context of the present invention is of minor importance that from a representation of the individual valves in each group of nozzles. 7

The high-pressure pipeline system 9 is fed via a pump 11 which is connected to the high-pressure piping system. 9 By means of the pump 11 is conveyed, the liquid descaling 8 from a low pressure supply system 12 under high pressure in the high-pressure piping 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 also connected. From the high-pressure storage device 14, the high-pressure liquid descaling 8 is cacheable.

The descaling E is operated essentially as follows:

The operation of the Entzunderungsbereiche 4 to 6 carried out inter- mittent. a phase, therefore, exists for each descaler 4 to 6 during which descaling liquid is sprayed onto the metal strip 8. 3 Likewise, during which the liquid descaling 8 is not sprayed onto the metal strip 3, a phase exists.

A maximum capacity of the pump 11 is designed such that the maximum flow rate is smaller than the maximum requirement for descaling. 8 The maximum output of the pump 11 and the capacity of the high-pressure storage device 14, however, are matched such that the need for liquid descaling 8, which is not covered by the maximum capacity of the pump 11, can be removed from the high pressure storage means fourteenth During the Entzunderungsphasen so the pump 11 is driven by the electric motor 13, wherein the demand deficit is taken out of liquid descaling 8 from the high pressure storage means fourteenth During the phases in which no descaling is carried out, the high-pressure storage means 14 is replenished.

In the prior art, the electric motor can be operated with 13 him the pump 11 at a constant speed. When the high-pressure storage means 14 is filled and a period of time .DELTA.t until the beginning of the next Entzunderungsvorgangs remains, therefore, a recirculation valve must be opened 15 in the prior art, so that the delivered by the pump 11 descaling 8 from the high-pressure pipeline system 9 and the high pressure storing means 14 can be removed. Since the electric motor 13 is operated in the art and continuously at a constant speed, it is sufficient in the prior art, when the electric motor 13 directly to an electrical supply network 16 is connected (generally a rotary power grid). In the inventive embodiment, however, the electric motor 13 is connected to the electric supply network 16 via a converter 17th

The inverter 17 may be configured as a direct converter in individual cases. However, it is preferred that the inverter 17 is formed according to the embodiment shown in Figure 2 as indirect converter. In this embodiment, the inverter can be operated and with it, 17 of the electric motor 13 with a higher dynamics.

The inverter 17 is connected by control technology with a control device 18th The control device 18 is configured such that it controls the inverter 17 such that the electric motor 13 is operated at a variable rotation speed n. 3 shows a purely exemplary of the rotational speed n of the electric motor 13 as a function of time t. Seen, the rotational speed n varies over time t. Regardless of the actual value of the rotational speed n of the speed is, however, n is always above a minimum speed nmin, in turn, is greater than zero. Furthermore, the speed remains n always below a maximum rotational speed nmax. In particular, due to the environmental stands, that the rotational speed n above the minimum speed nmin always remains, the electric motor 13 and the pump 11 therefore rotate continuously, the wear can be minimized.

The control device 18 is designed as a software programmable controller in the rule. You can make a driving state S of the converter 17, in turn, the

Rotational speed n of the electric motor 13 determines determine in various ways. In the simplest embodiment, the controller 18 determines the driving state S on the basis of a Istfüllgrades F of the high pressure storage means 14 in conjunction with a fixed Sollfüllgrad F * of the 14 high-pressure storage device For example, the control device 18 realize a two- or multi-point controller. It is better, however, when the controller 18 takes into account the Istfüllgrad F and other sizes for the determination of the driving state of S.

For example, the controller 18 can determine on the basis of further variables of the Sollfüllgrad F * as a function of time t and regulate the Istfüllgrad F on the respective Sollfüllgrad F *.

Furthermore, for example, the controller 18 can determine the Sollfüllgrad * F in dependence on an operating state of at least one of the B Entzunderungsbereiche 4 to 6. Particularly in the case that the time .delta.t until the beginning of next Entzunderungsvorgangs is known, the size of the period may in particular .delta.t in determining the Sollfüllgrades F * be considered. From a cost perspective, it may also be useful in determining the driving state of S and / or the Sollfüllgrades F * total charge I of the electric supply network 16 and / or a total load W of the low pressure supply system 12 into consideration.

The present invention has many advantages. In particular, the invention descaling E is more cost-effectively than a comparable operable descaling of the prior art. Furthermore, there is a lesser wear. The current load of the electric supply network 16 is smaller than in the prior art. The energy yield is improved. Furthermore, a longer life of the electric motor 13 and pump 11. Finally, results in the return valve 15 can be dimensioned smaller than is possible in the prior art. The above description serves only to illustrate the present invention. The scope of the present invention, however, should be determined solely by the appended claims.

Claims

claims
1. descaling,
- wherein the descaling device comprises at least one descaling for range (4 to 6),
- wherein in the at least one descaler (4 to 6) comprises a number of nozzles (7) is arranged, by means of which a liquid descaling (8) under high pressure to an article to be descaled metal strand (3) is aufspritzbar, - the nozzles (7) are connected to a high-pressure line system (9) over which the nozzles (7), the liquid descaling (8) can be fed,
- said driven to the high-pressure line system (9) by means of an electric motor (13) pump (11) is connected, by means of which the liquid descaling (8) made of a low-pressure supply network (12) under high pressure can be conveyed in the high-pressure line system (9),
- wherein to the high-pressure line system (9) a high-pressure storage means (14) is connected, by standing the un- ter high-pressure liquid descaling (8) can be buffered, characterized in that the electric motor (13) via a converter (17) to an electric supply network (16) is connected, that the converter (17) with a control device (18) control technology, and in that the control device (18) is designed such that it drives the inverter (17) such that the electric motor (13 ) with variable speed (n) is operated.
2. descaling device according to claim 1, characterized in that the inverter (17) is formed as an intermediate schenkreisumrichter.
3. descaling device according to claim 1 or 2, characterized in that the control device (18) is designed such that it drives the inverter (17) such that the variable speed (n) is always above a minimum speed (nmin) is, in turn, is greater than zero.
4. descaling device according to claim 1, 2 or 3, characterized in that the control device (18) is designed such that it drives the inverter (17) in response to at least one of the following variables:
- a Sollfüllgrad (F *) of the high-pressure storage means
(14), - a Istfüllgrad (F) of the high-pressure storage means (14),
- an operating condition (B) of the at least one descaling approach portion (4 to 6),
- a still time passing time (.delta.t) to the beginning of a Entzunderungsvorgangs,
- a total load (I) of the electric supply network (16) and
- a total load (W) of the low-pressure supply network
(12).
PCT/EP2009/061617 2008-10-07 2009-09-08 Descaling device comprising a pump drive operated at a variable speed WO2010040614A3 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08017562.3 2008-10-07
EP20080017562 EP2174729A1 (en) 2008-10-07 2008-10-07 Ignition device with pump drive with variable speed

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 200980139656 CN102176984B (en) 2008-10-07 2009-09-08 Descaling device comprising a pump drive operated at a variable speed
EP20090782752 EP2337642B2 (en) 2008-10-07 2009-09-08 Ignition device with pump drive with variable speed

Publications (2)

Publication Number Publication Date
WO2010040614A2 true true WO2010040614A2 (en) 2010-04-15
WO2010040614A3 true WO2010040614A3 (en) 2010-07-15

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PCT/EP2009/061617 WO2010040614A3 (en) 2008-10-07 2009-09-08 Descaling device comprising a pump drive operated at a variable speed

Country Status (3)

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EP (2) EP2174729A1 (en)
CN (1) CN102176984B (en)
WO (1) WO2010040614A3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103191937A (en) * 2012-01-10 2013-07-10 宝山钢铁股份有限公司 Segmental descaling control method for hot continuous rolling mill

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2420329A1 (en) * 2010-08-18 2012-02-22 Siemens Aktiengesellschaft Descaling assembly
CN102155394A (en) * 2011-04-08 2011-08-17 本溪水泵有限责任公司 Pneumatic control device installed at lower part of descaling pump liquid cylinder body
JP5790528B2 (en) * 2012-02-09 2015-10-07 東芝三菱電機産業システム株式会社 The control device of rolling descaling apparatus
CN102615059B (en) * 2012-03-27 2014-03-05 宝山钢铁股份有限公司 Method for cleaning high-pressure water gun for leveler
CN102755997A (en) * 2012-07-26 2012-10-31 宝钢不锈钢有限公司 Safe and energy-saving control device and control method of hot rolling high-pressure descaling system
CN104209354B (en) * 2014-07-17 2015-12-30 镇江金昶坤能源设备有限公司 Rolling descaling water jet pump system saving control method
CN105268687B (en) * 2015-11-12 2017-12-08 国网新疆电力公司和田供电公司 High-voltage power supply apparatus and method of cleaning insulator

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2605011B1 (en) * 1976-02-10 1977-07-28 Krupp Ag Huettenwerke Method and apparatus for descaling in the continuous forming, in particular rolls, elongate, metallic material, in particular steel
DE4328303A1 (en) * 1992-12-23 1994-06-30 Juergen Gaydoul Appts. for descaling of hot rolled material
JPH10127092A (en) * 1996-10-22 1998-05-15 Ebara Densan Kk Inverter unit for pump

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Publication number Priority date Publication date Assignee Title
DE4330519B4 (en) 1993-09-09 2004-08-05 Sms Demag Ag descaling
CN1177655C (en) 2001-09-20 2004-12-01 长沙矿山研究院 High-pressure water heat-state descaling system of electrohydraulic unloading valve
CN100563862C (en) 2007-11-12 2009-12-02 二重集团(德阳)重型装备股份有限公司 High-pressure water descaling system for hot continuous rolling production line

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2605011B1 (en) * 1976-02-10 1977-07-28 Krupp Ag Huettenwerke Method and apparatus for descaling in the continuous forming, in particular rolls, elongate, metallic material, in particular steel
DE4328303A1 (en) * 1992-12-23 1994-06-30 Juergen Gaydoul Appts. for descaling of hot rolled material
JPH10127092A (en) * 1996-10-22 1998-05-15 Ebara Densan Kk Inverter unit for pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103191937A (en) * 2012-01-10 2013-07-10 宝山钢铁股份有限公司 Segmental descaling control method for hot continuous rolling mill

Also Published As

Publication number Publication date Type
EP2174729A1 (en) 2010-04-14 application
EP2337642B2 (en) 2017-07-26 grant
EP2337642A2 (en) 2011-06-29 application
WO2010040614A3 (en) 2010-07-15 application
EP2337642B1 (en) 2013-11-13 grant
CN102176984B (en) 2013-11-20 grant
CN102176984A (en) 2011-09-07 application

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