EP0198910B1 - Verfahren und vorrichtung zum detektieren von schlacke - Google Patents

Verfahren und vorrichtung zum detektieren von schlacke Download PDF

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Publication number
EP0198910B1
EP0198910B1 EP85905609A EP85905609A EP0198910B1 EP 0198910 B1 EP0198910 B1 EP 0198910B1 EP 85905609 A EP85905609 A EP 85905609A EP 85905609 A EP85905609 A EP 85905609A EP 0198910 B1 EP0198910 B1 EP 0198910B1
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EP
European Patent Office
Prior art keywords
coils
transmitting
coil
receiving
receiving coil
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.)
Expired
Application number
EP85905609A
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German (de)
English (en)
French (fr)
Other versions
EP0198910A1 (de
Inventor
Wolfgang Theissen
Edmund Julius
Franz Rudolf Block
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.)
AMEPA ANGEWANDTE MESSTECHNIK und PROZESSAUTOMATISIERUNG GmbH
Original Assignee
AMEPA ANGEWANDTE MESSTECHNIK und PROZESSAUTOMATISIERUNG GmbH
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Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6248894&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0198910(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by AMEPA ANGEWANDTE MESSTECHNIK und PROZESSAUTOMATISIERUNG GmbH filed Critical AMEPA ANGEWANDTE MESSTECHNIK und PROZESSAUTOMATISIERUNG GmbH
Priority to AT85905609T priority Critical patent/ATE47062T1/de
Publication of EP0198910A1 publication Critical patent/EP0198910A1/de
Application granted granted Critical
Publication of EP0198910B1 publication Critical patent/EP0198910B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0025—Adding carbon material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • B22D11/186—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using electric, magnetic, sonic or ultrasonic means

Definitions

  • the invention relates to a method and a device for detecting slag flowing in a flow of a molten metal with a measuring transducer which comprises the contact between the flow of the molten metal and consists of at least one transmitting coil and one receiving coil, these being applied to at least one transmitting coil with a current containing several frequencies , which induces a voltage in the receiving coil, which is evaluated frequency-selectively.
  • the visual inspection is dispensed with and, when a predetermined filling level in the pouring ladle is reached, it is stopped.
  • EP-A-0 077 747 on which the preambles of claims 1 and 7 are based, describes a method and an apparatus for detecting slag.
  • EP-A-0 010 539 also describes a method for measuring the fill level of metals in vessels, in particular in continuous casting molds.
  • the invention has for its object to arrive at a method with which a small proportion of slag in the flowing melt can be recognized and displayed without having to remove the shielding of the pouring jet or hindering the pouring.
  • This object is achieved in that the conductivity distribution and the diameter of the flow cross section which changes as a result of wear are determined from the spectrally complex profile of the voltage induced by two transmitter coils, a continuous or quasi-continuous measurement of changing temperatures being used to calibrate the measured values of the induced voltage spectrum are so that the actual proportion of the slag in the passing molten metal is determined.
  • the temperatures of the melt and the sensor should be monitored continuously.
  • the temperature measurements are state of the art. The determination is particularly simple if the ohmic resistances of the coils are used to infer the temperatures of the measuring sensors and from this further the temperature of the melt.
  • the heat spread in the system itself can be calculated after the material constants have been determined in the usual way.
  • the value of the electrical conductivity which is included in the calculation of the distribution of the slag from the measured values of the voltage spectrum, can be corrected.
  • the use of two transmitting and one receiving coil which are arranged against each other so that the total magnetic flux of the individual frequencies passing through the receiving coil can be equalized to zero by appropriate feeding of the currents into the transmitting coils and that at the same time that of the two transmitting coils Eddy currents induced in the molten metal have different sizes.
  • a further embodiment of the invention provides that in the method the transmitting coils as receiving coils and the receiving coils act as pillars p Sendes.
  • a reference device which likewise consists of a transmitting and a receiving coil, and both transmitting coils are connected in series and both receiving coils are electrically connected to one another.
  • a further embodiment of the invention provides that a further winding is applied to the transmitter coil of the reference device, into which a current which is variable according to amounts and phase positions is fed in frequency-selectively so that the total voltages of the receiver coil for all frequencies become zero or approach zero.
  • the signals from the measuring coils are preferably measured with the aid of phase-sensitive rectifiers, and the evaluation and adjustment of the bridge circuits are carried out with the aid of a computer or microprocessor.
  • the device for carrying out the inventions consists in the fact that two transmitter coils and a receiver coil of the measuring sensor are integrated into the lining or perforated stones of a metallurgical vessel in such a way that either the transmitter and receiver coils coaxially surround the flow of the molten metal and the receiver coil inside, between the two transmitter coils or is also outside of the two transmitter coils, and that the coils are spaced from one another, or that the transmit and receive coil longitudinal axes of the coils point in the radial direction and offset the transmit coils by 90 ° and the transmit coil by 180 ° with respect to the receive coil at the same radial distances from the measurement object are.
  • the vessel can be provided with an outflow valve which can be controlled by the measured values determined.
  • one or more transmitting and receiving coils can thus be fixed in place around the pouring pouring stream in such a way that they preferably surround it coaxially.
  • the transmitter coils are fed with a current of several frequencies, the voltage induced in the pick-up coils being measured in a frequency-selective manner according to magnitude and phase position.
  • the radial distribution of the electrical conductivity can be used to infer the slag content in the melt.
  • a bridge circuit is used to increase the sensitivity, in which a reference arrangement consisting of a transmitting and receiving coil is switched so that the same supply current flows through the transmitter coils, while the receiver coils are switched so that the induced voltages are directed in opposite directions.
  • a further winding is applied to the reference coil, which is fed with the feed current at the same frequency with a current which can be changed in frequency and in the phase positions and amounts.
  • the measuring bridge is compared with this compensation current in such a way that the sum voltages of the individual frequencies at the receiving coils become zero. Changes in the electrical conductivity of the test object then lead to frequency-selective detuning of the zero adjustment of the bridge.
  • the transmitter coils are fed with currents which contain several frequencies and which are set frequency-selectively against each other in amount and phase position so that the induced voltage in the measuring coil is adjusted to zero for all frequencies. Changes in the electrical conductivity of the test object then lead to a frequency-selective detuning of the zero adjustment of the bridge.
  • Fig. 1a is a metallurgical vessel with 1, a melt with 2, a transmitter coil with 3, a receiver coil with 4, a pouring jet with 5, an outlet pipe with 6, a perforated brick with 7 and one Outflow slide designated 16.
  • the transmitter coil 3 encloses the pouring jet 5 and generates the primary field.
  • the receiving coil 4 is located coaxially within the transmitting coil 3. Both coils 3 and 4 are embedded in the perforated brick 7 and cast.
  • Fig. 1 b shows an example of how the sensors enclose the outlet pipe 6 of the pan and the intermediate vessel.
  • Transmitter coil 3 and receiver coil 4 are firmly connected to one another and enclose the outlet pipe 6 coaxially. Transmitter coil 3 and receiver coil 4 are attached to the outlet pipe 6 so that they can be easily removed and reused when the outlet pipe 6 is changed.
  • the reference arrangement consists of a transmitting and receiving coil, which are arranged in such a way that an approximately the same induction voltage is generated in the reference receiving coil as in the measuring coil.
  • Fig. 2 shows the basic structure of a measuring circuit for three frequencies, in which the transducer and the reference arrangement are operated in a bridge circuit.
  • a frequency generator 8 controls a power amplifier 9 with three frequencies, which feeds the series-connected transmission coils 10 of the measuring sensor and a transmission coil 11 of the reference arrangement.
  • a receiving coil 10a of the measuring sensor and a receiving coil 11a of the reference arrangement are connected to one another and designed in such a way that the induced voltages are almost compensated for.
  • the sum signal is fed via a high-impedance preamplifier 12 to phase-sensitive rectifiers 13, which break down the signal into real and imaginary parts, which are displayed on a corresponding output unit 14.
  • Fig. 3 shows the basic structure of a measuring circuit for three frequencies, in which the sensor and the reference arrangement are operated in a bridge circuit and the bridge adjustment is carried out by a compensation current.
  • the measuring and reference arrangement is operated as in FIG. 2.
  • a compensation winding 15 is applied to the reference coil arrangement, which is operated as a further transmitter coil.
  • the signal tapped at the frequency generator 8 is fed frequency-selectively via adjustable phase shifters 16a, 16b, 16c to the power amplifiers 9a, 9b, 9c feeding the compensation winding, the amplification of which can also be changed.
  • phase positions and the amounts of the compensation currents are set manually or by a computer or microprocessor 21 so that the sum voltage at the input of the preamplifier 12 is zero for all frequencies. Changes in the conductivity of the measurement object then lead to detuning of the bridge and to a sum signal at the input of the preamplifier 12, from the amounts and phase positions of which the radial distribution of the electrical conductivity of the pouring jet 5 and from this the slag fraction can be determined.
  • Fig. 4a shows the basic mechanical structure of a sensor, which consists of two transmitter coils 3, 3a and a receiver coil 4.
  • the transmitter coil 3 is thereby coaxially enclosed by the receiver coil 4 at a certain radial distance, the optimal value of which depends on the overall geometry of the sensor, and this in turn is enclosed by the second transmitter coil 3a, which works as a reference coil.
  • This coil arrangement is mechanically fixed to one another, preferably cast, and as a whole encloses the pouring jet 5 at a predetermined distance.
  • Fig. 4b shows the basic mechanical structure of a sensor, which consists of two transmitter coils 3, 3a and a receiver coil 4.
  • the transmitter coils 3, 3a and the receiver coil 4 are arranged in such a way that their axes point in the radial direction and that the transmitter coil 3a is offset by 90 ° and the transmitter coil 3 by 180 ° with respect to the receiver coil 4.
  • Fig. 5 shows the basic structure of a measuring circuit for three frequencies with the coil arrangement according to Fig. 4a or 4b as a sensor.
  • a frequency generator 8 controls a power amplifier 9 with three frequencies, which in turn feeds the transmitter coil 3 of the sensor.
  • the signal of the frequency generator 8 is simultaneously frequency-selectively supplied via adjustable phase shifters 16a, 16b, 16c to the power amplifiers 9a, 9b, 9c, which feed the transmitter coil 3a of the sensor.
  • the voltage induced in the receiving coil 4 of the sensor is fed via a preamplifier 12 to phase-sensitive rectifiers 13, which break down the signal frequency-selectively into real and imaginary parts, which are displayed on a corresponding output unit 14.
  • phase positions of the compensation currents in the transmission coil 3a are set by means of the phase shifters 16, 16b, 16c and the amounts by means of the amplification factors of the power amplifiers 9a, 9b, 9c so that the induction voltage at the input of the preamplifier 12 becomes zero for all frequencies.
  • Changes in the radial distribution of the electrical conductivity in the test object 5 lead to a detuning of the measuring bridge and to a signal at the input of the preamplifier 12, from whose amounts and phase positions the radial distribution of the electrical conductivity and from this the slag fraction in the pouring jet can be determined.
  • the measuring bridge can be adjusted manually or by a microprocessor 21.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
  • Measuring Volume Flow (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Continuous Casting (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Furnace Details (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
EP85905609A 1984-10-27 1985-10-17 Verfahren und vorrichtung zum detektieren von schlacke Expired EP0198910B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85905609T ATE47062T1 (de) 1984-10-27 1985-10-17 Verfahren und vorrichtung zum detektieren von schlacke.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843439369 DE3439369A1 (de) 1984-10-27 1984-10-27 Verfahren und vorrichtung zum detektieren von schlacke
DE3439369 1984-10-27

Publications (2)

Publication Number Publication Date
EP0198910A1 EP0198910A1 (de) 1986-10-29
EP0198910B1 true EP0198910B1 (de) 1989-10-11

Family

ID=6248894

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85905609A Expired EP0198910B1 (de) 1984-10-27 1985-10-17 Verfahren und vorrichtung zum detektieren von schlacke

Country Status (8)

Country Link
US (1) US4816758A (enrdf_load_stackoverflow)
EP (1) EP0198910B1 (enrdf_load_stackoverflow)
JP (1) JPH0741402B2 (enrdf_load_stackoverflow)
AT (1) ATE47062T1 (enrdf_load_stackoverflow)
CA (1) CA1270917A (enrdf_load_stackoverflow)
DE (2) DE3439369A1 (enrdf_load_stackoverflow)
WO (1) WO1986002583A1 (enrdf_load_stackoverflow)
ZA (1) ZA858227B (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018099685A1 (de) * 2016-11-29 2018-06-07 Refractory Intellectual Property Gmbh & Co. Kg Verfahren sowie eine einrichtung zum detektieren von grössen im ausguss eines metallurgischen gefässes
CN108290211A (zh) * 2015-12-01 2018-07-17 里弗雷克特里知识产权两合公司 冶金容器的喷口上的滑动封闭件

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NO326208B1 (no) * 1999-07-12 2008-10-20 Epsis As Fremgangsmate og anordning til maling av interfaseniva, samt anvendelse derav
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US8482295B2 (en) * 2009-02-23 2013-07-09 Hatch Ltd. Electromagnetic bath level measurement for pyrometallurgical furnaces
EP2383056B1 (en) * 2010-04-28 2016-11-30 Nemak Dillingen GmbH Method and apparatus for a non contact metal sensing device
DE102012019329A1 (de) 2012-10-02 2014-04-03 Gerd Reime Verfahren und Sensoreinheit zur Ortung und/oder Erkennung metallischer oder Metall enthaltender Objekte und Materalien
DE102015104217A1 (de) 2015-03-20 2016-09-22 Endress + Hauser Conducta Gesellschaft für Mess- und Regeltechnik mbH + Co. KG Messsystem zum Bestimmen der spezifischen elektrischen Leitfähigkeit
RU2662850C2 (ru) * 2016-03-09 2018-07-31 Открытое акционерное общество ЕВРАЗ Нижнетагильский металлургический комбинат Способ обнаружения шлака в потоке расплава металла
CN107363252A (zh) * 2017-08-07 2017-11-21 河钢股份有限公司邯郸分公司 一种提高浇注过程中钢水洁净度的控流装置及方法
CN109848386B (zh) * 2017-11-30 2021-02-05 上海梅山钢铁股份有限公司 一种连铸断流事故智能判断处置方法
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108290211A (zh) * 2015-12-01 2018-07-17 里弗雷克特里知识产权两合公司 冶金容器的喷口上的滑动封闭件
US10799949B2 (en) 2015-12-01 2020-10-13 Refractory Intellectual Property & GmbH & Co. KG Slide closure on the spout of a metallurgical vessel
CN108290211B (zh) * 2015-12-01 2021-07-06 里弗雷克特里知识产权两合公司 冶金容器的喷口上的滑动封闭件
WO2018099685A1 (de) * 2016-11-29 2018-06-07 Refractory Intellectual Property Gmbh & Co. Kg Verfahren sowie eine einrichtung zum detektieren von grössen im ausguss eines metallurgischen gefässes
US11141779B2 (en) 2016-11-29 2021-10-12 Refractory Intellectual Property Gmbh & Co. Kg Method and device for detecting variables in the outlet of a metallurgical vessel

Also Published As

Publication number Publication date
EP0198910A1 (de) 1986-10-29
ATE47062T1 (de) 1989-10-15
WO1986002583A1 (en) 1986-05-09
DE3573545D1 (en) 1989-11-16
DE3439369A1 (de) 1986-04-30
DE3439369C2 (enrdf_load_stackoverflow) 1989-04-13
JPS62500646A (ja) 1987-03-19
ZA858227B (en) 1986-06-25
CA1270917A (en) 1990-06-26
JPH0741402B2 (ja) 1995-05-10
US4816758A (en) 1989-03-28

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