EP4127585A1 - Procédé et système pour compenser l'usure d'une électrode dans un four à arc - Google Patents

Procédé et système pour compenser l'usure d'une électrode dans un four à arc

Info

Publication number
EP4127585A1
EP4127585A1 EP21715620.7A EP21715620A EP4127585A1 EP 4127585 A1 EP4127585 A1 EP 4127585A1 EP 21715620 A EP21715620 A EP 21715620A EP 4127585 A1 EP4127585 A1 EP 4127585A1
Authority
EP
European Patent Office
Prior art keywords
electrode
holding
holding position
determined
basis
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.)
Pending
Application number
EP21715620.7A
Other languages
German (de)
English (en)
Inventor
Jürgen Huber
Thierry Koeger
Alexander Mueller
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
Primetals Technologies Germany GmbH
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 Primetals Technologies Germany GmbH filed Critical Primetals Technologies Germany GmbH
Publication of EP4127585A1 publication Critical patent/EP4127585A1/fr
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces
    • F27D11/08—Heating by electric discharge, e.g. arc discharge
    • F27D11/10—Disposition of electrodes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
    • F27B3/085—Arc furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/28—Arrangement of controlling, monitoring, alarm or the like devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H05B7/109—Feeding arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to a method and a system for compensating for the burn-off of an electrode in an electric arc furnace.
  • Electrodes through which electricity flows are used in electric arc furnaces (Electric Are Furnace, EAF) in order to heat, in particular melt down, molten material such as scrap steel.
  • EAF Electric Are Furnace
  • the material to be melted is placed in a vessel where the usually vertically aligned electrodes can then be introduced into the material to be melted, at least with their lower electrode end.
  • the electrodes When melting down, the electrodes are subject to wear, known as burn-off. Due to the arcs generated between the electrodes and the melting material, material is removed in the area of the lower electrode ends, so that the electrodes are effectively shortened during operation.
  • the electrodes are usually constructed in a segmented manner, so that if necessary, i. H. in the case of significant shortening, additional electrode segments can be added to the upper electrode ends, for example screwed to them.
  • the suspension of the electrodes e.g. B. is adapted via a holding device in such a way that the electrodes can continue to be inserted at least partially into the melting material.
  • a clamping ring device which has a first upper clamping ring and a second includes lower clamping ring. So that the sensitiveChinanab sections of the electrode can be recognized, at least the upper clamping ring is provided with a sensor device by means of which markings on the electrode can be recognized.
  • a sliding device is shown in order to enable a controlled displacement of the electrode. The problem is that the connecting portions of the electrode should be avoided as they are fragile and should not be clamped there.
  • a detection device which is connected to a first movement device, detects these connection sections.
  • EP 3196575 A1 shows a device for varying the clamping position of an electrode.
  • a positioning device which is arranged on a fixed base and has a lifting device is used for this purpose.
  • the positioning device can determine the position and weight of the electrode.
  • the positioning device can also temporarily support the electrode in relation to the height position.
  • WO 01/88472 A1 shows a method for measuring a consumable electrode.
  • a method for compensating for the erosion of an electrode in an electric arc furnace has the following steps: (i) detecting at least part of the electrode held by a holding device at a first holding position, in particular vertically, using a sensor device; (ii) Determining a first distance on the basis of the data generated during acquisition, the first distance between an upper electrode end and the first holding position being determined on the basis of at least the distance and a predetermined connection position at which two segments of the electrode are connected to one another are connected, as well as a predetermined connection area, a second stop position is determined; (iii) verify that the electrode is supported on a support device; and (iv) repositioning the holding device relative to the electrode from the first holding position to the determined second holding position.
  • a detection of a part of an electrode in the sense of the invention is preferably a (sensory) recording, scanning or scanning and / or the like of the electrode part.
  • properties of the electrode and possibly also of the holding device holding the electrode in particular its shape and / or contour, can be detected and possibly mapped, for example, by (sensor) data generated during detection.
  • Repositioning within the meaning of the invention is preferably a change in the orientation and / or position of the holding device, in particular relative to an electrode.
  • Repositioning can, for example, correspond to moving, in particular a method, of the holding device relative to an electrode. This can assume that the electrode is not held by the holding device when it is repositioned.
  • One aspect of the invention is based on the approach that a holding device for holding an electrode is repositioned automatically, possibly cyclically, relative to the electrode, ie on an automation of the repositioning.
  • the repositioning can, for. B. before or after a Feststel development of a substantial shortening of the total length of the electrode be provided or take place.
  • at least part of the electrode held by the holding device at a first holding position is sensed by sensors in order to determine a second holding position at which the holding device can then (automatically) be positioned.
  • a part of the electrode can be scanned or scanned with the aid of a sensor device in order to find possible new holding positions.
  • a second stop position can then optionally be selected from these.
  • An upper end of the electrode is in this case preferably a second end of the electrode, in particular of cylindrical design, which is opposite a lower, first end of the electrode at which the erosion occurs.
  • the first holding position can be defined, for example, by an assigned marking on the holding device or an element of the holding device that can be detected by the sensor device.
  • a second holding position is determined on the basis of the first distance and a predetermined connection position at which two segments of the electrode are connected to one another. Since holding the electrode on or at least in the immediate vicinity of such a connection position could damage the electrode segments or the segment connection, operational reliability can be increased or at least ensured by taking into account the predetermined connection position.
  • the connection area corresponding to the predefined connection position a remaining portion in which the electrode can be held can be determined. For example, it can be determined that the holding device has to be axially displaced by a minimum length, ie in the direction of a longitudinal axis of the electrode, relative to the electrode in order to avoid the electrode being held on a segment connection located directly above the holding device.
  • connection area can, for example, be calculated on the basis of the electrode end and the segments used, and can be detected by the sensor device and / or by a special sensor device.
  • the sensory detection By means of the sensory detection, it can be checked, for example, whether the electrode is still long enough to be held in a position other than the current first holding position. Alternatively or additionally, it can be ensured by the sensory detection that the second holding position lies in a section of the electrode which is suitable for holding at all, e.g. B. is not in the area of a junction of two electrode segments. Because the second stop position is preferably determined on the basis of data generated during acquisition, in particular automatically, operating errors that can occur during manual repositioning can at least largely be excluded.
  • the electrode can, for example, be supported on a preferably table-like support device and the holding device can then be moved to the second holding position, especially after loosening a clamping or gripping unit, such as a clamping jaw, of the holding device relative to the supported electrode.
  • a clamping or gripping unit such as a clamping jaw
  • the repositioning of the holding device preferably includes not only a loosening or at least partial opening of the clamping or gripping unit, but also a final closing or tightening of the clamping or gripping unit.
  • the electrode can then be held in the second holding position by the final closing or tightening.
  • a first, in particular vertical, distance between an upper end of the electrode and a marking attached to the electrode is determined on the basis of the data generated during the acquisition and is used as the basis for determining the second holding position.
  • it can be assessed, for example, whether there is still enough space to hold the electrode between the marking and the upper end of the electrode. In other words, it can be assessed whether the electrode still has a sufficient remaining length at all, so that it can be held at a second holding position.
  • the marking is preferably designed in such a way that it can be detected, in particular optically, by the sensor device.
  • the marking can be designed as a paint, one or more notches or the like, for example. It is also conceivable that the marking is formed by a component, for example a clamp, which is attached to the electrode in order to determine the second holding position. As a result, a user can influence the determination of the second stop position.
  • the marking can also be gebil det from the holding device, which holds the electrode in the first holding position. Since the position of the holding device relative to the electrode initially corresponds to the first holding position, in this preferred embodiment the first, in particular vertical, distance between the upper end of the electrode and the first holding position is determined on the basis of the data generated during the acquisition and the determination of the based on the second stop position. So z. B. reliably a second holding position can be selected, which is between the first (against ticartigen) holding position and the upper end of the electrode.
  • the data generated during acquisition contain a profile of a horizontal distance between the electrode and / or the holding device on the one hand and the sensor device on the other hand, which can also be referred to as a distance profile.
  • the second stop position is preferably determined on the basis of this stand profile.
  • the first, in particular vertical, distance between the upper electrode end and the first holding position can be derived from the stand profile, which is then used as the basis for determining the second holding position. Using the distance profile the spatial position of the first holding position relative to the upper end of the electrode can be determined particularly easily.
  • the spacing profile in this case preferably forms the axial, ie parallel to a longitudinal axis of the electrode, surface profile of the electrode from the upper end of the electrode in the direction of the first holding position.
  • the spacing profile can at least partially map a silhouette or contour of the electrode and preferably also at least part of the holding device. If the horizontal distance is detected, for example, beyond the upper end of the electrode, the distance profile at the upper end of the electrode shows, for example, an abrupt and significant increase in the measured horizontal distance from the sensor device. On the other hand, a decrease in the measured horizontal distance occurs e.g. B. in the area of the first holding position, where the electrode is held by the holding device.
  • a pressure signal or an optical sensor device is used to verify that the electrode is on a support device, in particular a table-like support device is supported before the holding device is repositioned from the first holding position to the second holding position. This can in particular ensure that an active repositioning of the holding device is possible without risk be the sensor device.
  • the holding device in particular a lifting unit of the holding device, can have a pressure sensor system for detecting a pressure, in particular a hydraulic pressure, which is set up to output the pressure signal.
  • a hydraulic pressure is to be understood here as a pressure in a hydraulic medium of a hydraulic system which is set up for positioning the holding device, in particular for raising and lowering the clamping or gripping unit of the holding device.
  • the electrode When the electrode is supported on the support device, the weight to be borne by the hydraulics drops, as a result of which the hydraulic pressure drops.
  • This pressure drop can be detected by the pressure sensor system and a corresponding pressure signal can be output accordingly.
  • the electrode can be positioned above the support device with the aid of the holding device and then lowered until the lower end of the electrode makes contact with the support device and the pressure sensor system thus generates a pressure signal.
  • the electrode can be positioned above the support device with the aid of the holding device and the support device can then be raised until the lower end of the electrode contacts the support device and the pressure sensor system thus generates a pressure signal.
  • a remaining length of the electrode is determined and output.
  • a remaining length can be understood to mean the remaining total length of the electrode. This makes it possible, for example, to determine when it is necessary to attach a further electrode segment in order to ensure the continuous operation of the arc furnace. In particular, can in this way it is possible to reliably estimate how often the holding device can still be repositioned relative to the electrode before another electrode segment has to be attached.
  • the remaining length is determined on the basis of a second, in particular vertical, distance between the first holding position and the Abstweilvor device.
  • both the holding device and the supporting device can have a position encoder with which a vertical distance of the holding device, in particular the gripping unit, or the supporting device to a reference position, for example a floor, can be determined.
  • the second distance between the first holding position and the Abstauervor direction then results from the difference between these vertical distances from a reference position.
  • the first distance between the upper end of the electrode and the first holding position can be added to this second distance, resulting in the remaining remaining length of the electrode.
  • the remaining length of the electrode can thus be determined particularly precisely.
  • the determined remaining length is checked after each melting cycle in the electric arc furnace and the second holding position is determined as a function of a result of the test. In particular, it can be checked whether the determined remaining length reaches or falls below a predetermined minimum length threshold value.
  • z Before the second stop position is determined, z. For example, it can be decided whether, for example, it is necessary to place another electrode segment on the upper end of the electrode. If necessary, the resulting new electrode length can be taken into account when determining the second stop position.
  • the electrode is moved vertically, ie in a direction parallel to its longitudinal axis, to grasp at least part of the electrode with the aid of the holding device. In particular, the electrode can be moved relative to the sensor device with the aid of the holding device. This allows the sensor device to be installed in a stationary manner and thus to save a separate lifting device for the sensor device.
  • the movement of the electrode enables a particularly precise detection of the horizontal distance between the electrode and the sensor device.
  • the distance profile can therefore be generated.
  • the sensor device for detecting at least part of the electrode with the aid of the support device is vertically, i. H. Move in one direction parallel to the longitudinal axis of the electrode.
  • the support device can have a lifting device.
  • the second holding position is determined on the basis of an averaging of the data generated in each case.
  • the second stop position can be determined on the basis of an averaged distance profile.
  • the sensor device is designed, for example, as a laser scanner or has a pivoting means for pivoting a laser beam
  • at least a part of the electrode can be detected 2 to 16 times, preferably 4 to 12 times, in particular essentially 8 times. This enables the influence of noise or isolated artifacts in the data generated during acquisition to be reduced.
  • the second holding position can thereby be determined particularly reliably and precisely.
  • a measure for the reliability of the data generated during detection is determined. For example, on the basis of an intensity of a sensor signal, for example a laser beam, detected with the aid of an optical sensor device, it can be estimated how high an aerosol concentration, for example the dust and / or water content, is in the air. If the measure for the reliability reaches or falls below a predetermined reliability threshold value, the detection process can be interrupted and / or a corresponding warning signal can be output.
  • the sensor device has a camera or a laser sensor with which at least part of the electrode is detected.
  • a single image or an image sequence of at least part of the electrode and recorded from the image or the image sequence for example using an algorithm for digital image processing, in particular for feature recognition, for example the first distance between the upper end of the electrode and the first Stop position can be determined.
  • data generated by the laser sensor can characterize a horizontal distance. For example, by moving the laser sensor relative to the electrode or the holding device, a course of the horizontal distance between the electrode and the laser sensor along the Determine the longitudinal direction of the electrode, ie the distance profile, and derive the first distance between the upper end of the electrode and the first holding position therefrom.
  • the laser sensor can especially deliver precise results and is also less sensitive to contamination.
  • a number of several electrodes are held with the aid of the holding device.
  • the sensor device preferably has a corresponding number of laser sensors, with which at least part of one of the electrodes is detected in each case.
  • a laser sensor can be provided per electrode, which is for example aligned with the respective electrode.
  • at least part of each electrode can be recorded particularly precisely.
  • a system for compensating for the erosion of an electrode in an arc furnace comprises: (i) a holding device which is configured to hold an electrode at a first holding position, in particular vertically; (ii) a sensor device that is set up to detect at least one area from an upper end of the electrode to the first holding position, a part of the electrode being held; (iii) a processing device which is set up to verify that the electrode is supported on a support device; generated data are contained and a predetermined connection position at which two segments of the electrode are connected to one another, as well as a predetermined connection area to determine a second holding position; (and (iv) a control device which is set up to cause a repositioning of the holding device relative to the electrode from the first holding position to the determined second holding position.
  • a preferred embodiment provides that a number of several electrodes are held with the aid of the holding device, and the sensor device has a corresponding number of laser sensors and / or cameras with which at least a part of one of the electrodes is detected.
  • the sensor device has a camera or a laser sensor.
  • the processing device is set up to use a signal from a pressure measuring device or data from an optical sensor device to verify that the electrode is supported on the support device before the holding device moves from the first holding position to second stop position is repositioned. It shows, at least partially schematically:
  • FIG. 1 shows an example of a system for compensating the fire from three electrodes in an electric arc furnace in a plan view
  • FIG 2 shows an example of a system for compensating for the Ab fire of an electrode in an electric arc furnace in egg ner side view
  • FIG. 1 shows an example of a system 1 for compensating for the burn-off of three electrodes 2 in an electric arc furnace 3 in a plan view.
  • the electrodes 2 are each held by a holding device 4 of the system 1, preferably vertically as shown in FIG. 1, in a first holding position.
  • a vertical holding is to be understood here as a holding in which a longitudinal axis of each electrode 2 is vertically aligned.
  • the system 1 also has a sensor device 5, which is set up to detect at least a portion of each of the held electrodes 2, as well as a processing device 6, which is set up for this purpose is to determine a second holding position on the basis of data generated during the acquisition, in particular special for each of the electrodes 2.
  • a control device 7 of the system 1 is set up to initiate repositioning of the holding device 4 relative to the electrodes 2 from the first holding position to the determined second holding position, e.g. B. by appropriate control of the holding device 4.
  • the vertically held electrodes 2, in particular the lower electrode ends can be positioned in a vessel 8 of the electric arc furnace 3, where they can be at least partially inserted into a melted material and melted by a current flow.
  • the Haltevor device 4 has a lifting unit 4a with which the electrodes 2 move vertically, d. H. can be raised and / or lowered perpendicular to the plane of the drawing.
  • the electrodes 2 can preferably also be moved out of the vessel 8 and positioned over a support device 9, which is preferably arranged outside next to the arc furnace 3, for example adjacent to the vessel 8.
  • a support device 9 which is preferably arranged outside next to the arc furnace 3, for example adjacent to the vessel 8.
  • support arms 4b of the holding device 4 can be horizontal, i. H. in the plane of the drawing, are pivoted until the electrodes 2 are positioned above the Abstützvor device 9. From this position, indicated by dashed lines, the electrodes 2 can be lowered onto the support device 9 with the aid of the lifting unit 4a.
  • the electrodes 2 can also be supported by lifting the support device 9, for example with the aid of a corresponding lifting device.
  • the support device 9 and the sensor device 5 are preferably arranged relative to one another in such a way that the sensor device 5 has a free or unobstructed field of view of the electrodes 2 supported by the support device 9 or at least positioned above the support device 9.
  • a z. B. as a camera wornbil ended sensor device 5 the electrodes 2 at least partially or in sections reliably detect.
  • the sensor device 5 has several, namely three, laser sensors 11 instead of a camera, each of which is set up to detect, in particular to scan or scan, at least a part or section of one of the three electrodes 2 with the aid of a laser beam 12. If the sensor device 5 or the laser sensors 11 have no means for pivoting the laser beams 12, for example in the form of pivotable mirrors, it is conceivable to provide a sensor lifting device 10. With their help, the sensor device 5 or the laser sensors 11 are preferably at least vertically displaceable in order to detect the electrodes 2 in each case from an upper electrode end at least up to the first holding position.
  • the electrodes 2 can be moved vertically with the aid of the holding device 4, in particular the lifting unit 4a, before they are supported by the supporting device 9, in order to detect the areas between the upper electrode ends and the first holding positions.
  • the control device 7 can cause the holding device 4 to clamp or gripping units 4c of the holding device 4, which the electrodes 2 z. B. hold by changing your grip, to loosen or at least partially open so that the electrodes 2 are movable relative to the gripping units 4c.
  • the control device 7 can then cause the holding device 4, in particular the lifting unit 4a, or, alternatively, the supporting device 9 to move vertically so that the gripping units 4c are positioned at the level of the second holding position.
  • the control device 7 then controls the holding device 4, in particular the gripping units 4c, preferably in such a way that the gripping units 4c close again and thereby the electrodes 2 are held firmly at the second holding position.
  • the sensor device 5 it is also conceivable to position the sensor device 5 in such a way that the electrodes 2 can be detected at least partially or in sections, in particular from their upper electrode end to the first holding position, when the electrodes 2 are still above the arc furnace 3 or of the vessel 8, in particular in an operating position.
  • This allows the second holding position to be determined and, if necessary, also a repositioning of the holding device 4, in particular the gripping units 4c, relative to the electrodes 2 without the electrodes 2 having to be pivoted horizontally, possibly even without the electrodes 2 being removed from the arc furnace 3 or the vessel 8 must be lifted out.
  • FIG. 2 shows an example of a system 1 for compensating for the burn-off of an electrode 2 in an electric arc furnace in a side view.
  • the system 1 has a holding device 4 for holding the electrode 2 at a first holding position Hl and a sensor device 5 for detecting at least part of the held electrode 2.
  • the system 1 also has a Processing device 6 for determining a second holding position H2 on the basis of data generated during the acquisition and a control device 7 for initiating a repositioning of the holding device 4 relative to the electrode 2 from the first holding position Hl to the determined second holding position H2.
  • the holding device 4 holds the electrode 2 vertically, d. H. in such a way that a longitudinal axis L of the electrode 2 is oriented perpendicularly.
  • the processing device 6 and the control device 7 are designed as software modules that can be executed, for example, by a work device 13.
  • a work device 13 In the work equipment 13 it can be, for. B. a computer, in particular a personal computer, a memory-programmable controller, an (application-specific) integrated circuit (ASIC) and / or the like.
  • ASIC application-specific integrated circuit
  • the holding device 4 comprises a support arm 4b, on whose end facing the electrode 2 a gripping unit 4c, for example a clamping jaw, is arranged.
  • the electrode 2 can be gripped and held with the aid of the gripping unit 4c. If the gripping unit 4c loosens its grip, the holding device 4 can be repositioned relative to the electrode 2, for example by supporting the electrode in a stationary manner by a support device (not shown) on a lower electrode end (not shown) and lifting the holding device 4.
  • the sensor device 5 is designed as a laser sensor 11 which emits a laser beam 12.
  • the electrode 2 in particular from its upper electrode end 2a, at least up to first holding position Hl or to the gripping unit 4c, are scanned.
  • the laser beam 12 can be pivoted for example with the aid of a pivotable mirror.
  • the sensor device 5 and electrode 2 can be moved relative to one another, for example by lifting or moving the electrode 2 with the aid of the holding device 4 in the direction of the laser beam 12. This is indicated by the arrow P.
  • the data generated during detection with the aid of the laser sensor 11 can then contain a profile of the horizontal distance D 1 between the electrode 2 and the sensor device 5. From this distance profile, for example, a first (vertical) distance D2 between the upper electrode end 2a and the first holding position Hl, in particular the holding device 4 or the gripping unit 4c, can be derived. On the basis of the distance profile or the first distance D2 derived therefrom, the second holding position H2, namely between the upper electrode end 2a and the first holding position Hl, can be determined.
  • the determination of the second holding position H2 is preferably also based on a predetermined connection position V at which segments E1, E2 of the electrode 2 are connected to one another, for example screwed to one another.
  • the second holding position H2 is preferably selected such that it does not overlap the predetermined connection position V or a connection area B indicated by hatching in FIG. This can prevent the electrode 2, in particular a connecting means used to connect the electrode segments E1, E2, from being damaged when held by the holding device 4, for example by exerting pressure with the gripping unit 4c.
  • FIG 3 shows an example of a profile A of the horizontal distance Dl between an electrode held by a holding device at a first holding position Hl on the one hand and a sensor device on the other hand, with which at least a part or section of the electrode is detected, for example by moving the sensor device and the electrode or the holding device relative to one another.
  • the profile A is also referred to as the distance profile and results from the plot of the horizontal distance D1 against a displacement path z of the sensor device and electrode or holding device relative to one another.
  • the spacer profile A preferably forms the shape or contour of the electrode that is held and at least part of the device.
  • an upper electrode end 2a and a gripping unit 4c that encompasses the electrode can be seen.
  • the position of the gripping unit 4c also results in the position of the first holding position Hl relative to the upper electrode end 2a, and thus in particular a first (vertical) distance D2 between the upper electrode end 2a and the first holding position Hl.
  • a second holding position (see FIG. 2) can be determined, which is preferably between the upper electrode end 2a and the first holding position Hl. If the length of the segments from which the electrode is composed is also known, starting from the upper end of the electrode 2a on predetermined connection positions at which the segments are connected to one another, ge can be closed. If the first distance D2 determined on the basis of the distance profile A is greater than the previously known segment length, by subtracting the (axial) length of a connection area by the specified connection position from first distance D2 the still available electrode section, in which the electrode can be held, determined and based on this, the second holding position can be determined.
  • FIG. 4 shows an example of a method 100 for compensating for the burn-off of an electrode in an electric arc furnace.
  • a method step S1 at least part of the electrode held by a holding device at a first holding position is detected with the aid of a sensor device.
  • the electrode can be scanned or scanned at least in sections, in particular in an area at its upper end, for example with the aid of a laser sensor.
  • the data generated in the process for example a profile of a horizontal distance between the electrode and / or the holding device on the one hand and the sensor device on the other hand, are used as the basis for determining a second holding position in a second method step S2.
  • a first, in particular vertical, distance between the upper electrode end and the holding device or the first holding position can be derived. This first distance determined in this way corresponds to a section of the electrode in which it is still possible to hold the electrode.
  • a predetermined connection position at which two segments of the electrode are connected to one another, can also be taken into account.
  • an axial where "axial” refers to a direction parallel to a longitudinal axis of the electrode
  • extension or length of a connection area around the connection position can be subtracted from the determined first distance to a “cleaned” remaining section in which the Electrode is possible to obtain.
  • the electrode can then be supported with the aid of a support device, i. H. made to be.
  • a pressure signal can be recorded, which is generated, for example, by a pressure sensor system built into the support device or in a hydraulic system for lifting and lowering the support device. From the relative positioning of the holding device and the supporting device present at the time the pressure signal was detected, which can be detected, for example, using position encoders of the holding device or the supporting device, as well as the determined first distance between the upper electrode end and the first holding position or the Holding device can then be deduced from a remaining total length of the electrode, which can be given to a user, for example.
  • the holding device can be repositioned relative to the electrode, specifically in such a way that the holding device now holds the electrode at the determined second holding position.
  • a gripping unit of the holding device holding the electrode for example a clamping jaw, is preferably loosened first.
  • the holding device and the supporting device and thus also the supported electrode can then be moved relative to one another, for example by the holding device moving along the electrode, ie pa- parallel to the longitudinal axis of the electrode, moved or by lifting the support device.
  • the electrode can then be held again, for example gripped, with the aid of the gripping unit.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Discharge Heating (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)

Abstract

La présente invention concerne un procédé (100) et un système (1) pour compenser l'usure d'une électrode (2) dans un four à arc (3). Selon l'invention, au moins une partie de l'électrode (2) maintenue par un dispositif de retenue (4) au niveau d'un premier emplacement de retenue (H1) est détectée (S1) à l'aide d'un dispositif de détection (5) et un deuxième emplacement de retenue (H2) est déterminé (S2) sur la base de données générées lors de la détection. Le dispositif de retenue (4) peut ensuite être déplacé (S4) par rapport à l'électrode (2) du premier emplacement de retenue (H1) au deuxième emplacement de retenue (H2) déterminé.
EP21715620.7A 2020-03-31 2021-03-31 Procédé et système pour compenser l'usure d'une électrode dans un four à arc Pending EP4127585A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP20167232.6A EP3889531A1 (fr) 2020-03-31 2020-03-31 Procédé et système de compensation de la combustion d'une électrode dans un four à arc
PCT/EP2021/058436 WO2021198334A1 (fr) 2020-03-31 2021-03-31 Procédé et système pour compenser l'usure d'une électrode dans un four à arc

Publications (1)

Publication Number Publication Date
EP4127585A1 true EP4127585A1 (fr) 2023-02-08

Family

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Application Number Title Priority Date Filing Date
EP20167232.6A Withdrawn EP3889531A1 (fr) 2020-03-31 2020-03-31 Procédé et système de compensation de la combustion d'une électrode dans un four à arc
EP21715620.7A Pending EP4127585A1 (fr) 2020-03-31 2021-03-31 Procédé et système pour compenser l'usure d'une électrode dans un four à arc

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP20167232.6A Withdrawn EP3889531A1 (fr) 2020-03-31 2020-03-31 Procédé et système de compensation de la combustion d'une électrode dans un four à arc

Country Status (3)

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US (1) US20230204291A1 (fr)
EP (2) EP3889531A1 (fr)
WO (1) WO2021198334A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023106881A1 (de) 2023-03-20 2024-09-26 Sms Group S.P.A. Verfahren zum Regeln eines Betriebs eines elektrischen Ofens und elektrischer Ofen zum Schmelzen von Schmelzmaterial

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPQ755800A0 (en) * 2000-05-17 2000-06-08 Qni Technology Pty Ltd Method for measurement of a consumable electrode
DE102012224470A1 (de) * 2012-07-27 2014-01-30 Sms Siemag Ag Vorrichtung und Verfahren zum Nachsetzen einer Elektrode für einen metallurgischen Ofen
ITUB20160079A1 (it) * 2016-01-19 2017-07-19 Fast Tech S R L Dispositivo di posizionamento di almeno un elettrodo per forni fusori.
FI20165035A (fi) * 2016-01-20 2017-07-21 Outotec Finland Oy Menetelmä valokaariuunin yläelektrodiasetelmakokoonpanon käyttämiseksi ja valokaariuunin yläelektrodiasetelmakokoonpano

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EP3889531A1 (fr) 2021-10-06
US20230204291A1 (en) 2023-06-29
WO2021198334A1 (fr) 2021-10-07

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