EP0029796A1 - System zur Bestimmung der Höhe und des physikalischen Zustandes der Schlacke in einem metallurgischen Gefäss - Google Patents

System zur Bestimmung der Höhe und des physikalischen Zustandes der Schlacke in einem metallurgischen Gefäss Download PDF

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Publication number
EP0029796A1
EP0029796A1 EP80630037A EP80630037A EP0029796A1 EP 0029796 A1 EP0029796 A1 EP 0029796A1 EP 80630037 A EP80630037 A EP 80630037A EP 80630037 A EP80630037 A EP 80630037A EP 0029796 A1 EP0029796 A1 EP 0029796A1
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EP
European Patent Office
Prior art keywords
measuring system
enclosure
microphone
cell
crucible
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
EP80630037A
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English (en)
French (fr)
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EP0029796B1 (de
Inventor
Jean Baumert
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.)
Arcelor Luxembourg SA
Original Assignee
Arbed SA
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 Arbed SA filed Critical Arbed SA
Priority to AT80630037T priority Critical patent/ATE8800T1/de
Publication of EP0029796A1 publication Critical patent/EP0029796A1/de
Application granted granted Critical
Publication of EP0029796B1 publication Critical patent/EP0029796B1/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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing

Definitions

  • the present invention relates to a system for determining the level and for assessing the physical state of the slag in a metallurgical vessel, in particular in a steelworks to oxygen converter.
  • Knowledge of the level of slag in a steelworks converter is important, both from the metallurgical point of view, as a parameter of the degree of refining progress, and from the point of view of safety, in order to prevent overflow .
  • the applicant has developed a system for measuring the level of the slag which allows at the same time an evaluation of the consistency thereof, which constitutes important information, especially for the refining of phosphorous cast irons where a slag of a frothy consistency was considered desirable.
  • This measurement system that the applicant described in the Luxembourg patent no. 71.261, includes a thermostatic acoustic conduit which is placed above the converter and which picks up the noise emitted by the oxygen blowing lance. After filtering the frequencies whose origin is foreign to the parameters of interest for the measurement proper, we retain a signal whose interpretation allows us to conclude on the degree of the noise absorbed by the slag and thereby on the degree of the sparkling character present, as well as at its level in the crucible.
  • the object of the invention therefore consists in proposing a measurement system making it possible to continue using the principle of measuring the sound of the blowing lance in order to establish the thickness of the slag layer and its consistency, both in in the case of several neighboring crucibles, only in the case of installations where the refining is carried out in a vacuum.
  • the measurement system according to the invention which is characterized in that a sufficient number of pipes of the cooling system installed in the chimney above the crucible have an extension and form a cylindrical crown which projects outwards from the chimney shell and whose axis is inclined towards the center of the crucible, which crown forms the seat of a cylindrical crimp connected to a circular double-walled cell cooled with water and provided with a central orifice, to which cell is connected the enclosure which contains the actual acoustic sensor.
  • This acoustic sensor is preferably a microphone known per se, as it is used for example in the measurement system described by the applicant in the text of the Luxembourg patent no. 71.261. It is the same for the electronic assembly which is connected to said acoustic sensor and which ensures the processing of the signals received, as well as their conversion into significant information, either for the operator or for the automatic processor which conducts the process of the refining.
  • the idea which is the basis of the invention consists in designing an acoustic capture installation adapted to the environmental conditions existing inside the crucible-chimney assembly itself and in housing this installation in a place where a maximum protection can be accommodated for the sensor itself which is an extremely sensitive instrument.
  • the challenge is to stay that this instrument inside the fireplace in the crucible rife tempera- t ure s above 1000 0 to ensure good management of significant frequency sounds, even if a facility where refining is carried out in a vacuum, is not possible without the arrangement according to the invention of the chimney cooling pipes to form the seat of the enclosure which contains the acoustic sensor.
  • the enclosure containing the acoustic sensor is connected to the circular cell.
  • a sound recording element in the form of a disc the central part of which is flared, is interposed between the enclosure and the circular cell.
  • This flared blunt part is located inside the central orifice of the circular cell and it is directed towards the source of the noise, i.e. towards the crucible.
  • the disc bears on the one hand against the circular cell and on the other hand by means of a flexible seal, against the enclosure which contains the acoustic sensor.
  • a first embodiment of the measurement system according to the invention consists in providing between the microphone and the sound pickup element an acoustic tube which is housed in one enclosure.
  • the advantage of this embodiment lies in the fact that the microphone is thus well protected from any risk of damage, the acoustic tube being able to be produced in lengths greater than 3 meters. However, this implies the use of a linearization filter making it possible to compensate for the proper resonances of the acoustic tube.
  • a second embodiment provides for housing the microphone directly in the enclosure, opposite the sound pickup element.
  • the microphone is housed in a tube which carries at its end opposite the sound pick-up element a perforated plug preferably made of steel.
  • a brass membrane with a thickness of ⁇ 0.1 mm which may include a layer of quartz (deposited by vaporization).
  • the role of the perforated capsule is to protect the membrane against the heat of irradiaticnet against possible projections, while the membrane itself protects the microphone from dust
  • the distances between the perforated capsule and the membrane, resp. between the diaphragm and the microphone, are defined and reproducible, so that a calibration of the sound recording part is only necessary once.
  • the enclosure which contains the sensor is cooled using a neutral gas, preferably nitrogen, which is introduced behind the enclosure and which exits through the flared part of the sound pickup element.
  • a neutral gas preferably nitrogen
  • the gas makes it possible, by exiting through the flared part of the sound pick-up element, to spread the flames and dust from this orifice.
  • the enclosure usefully includes a double wall cooled with water.
  • This water must also be cold water, with a temperature around 10 ° C, while the water which circulates in the pipes which form the cylindrical ring supporting the measuring device, shows temperatures higher than 50 ° C.
  • the circular cell also has a double wall inside which circulates cooling water.
  • the crimping surrounding the cylindrical crown of pipes can be cooled if necessary, preferably with nitrogen.
  • FIG. 1 shows a diagram of the arrangement according to the invention of the cooling pipes in a cylindrical ring to form the seat of the measuring device
  • fig. 2 shows a section of the embodiment of the installation comprising an acoustic tube intermediate between the microphone and the sound pick-up element
  • FIG. 3 shows the embodiment which provides for housing the microphone directly in front of the sound pickup element.
  • the diagram in fig. 1 shows the advantage achieved by the arrangement according to the invention of the seat for the measuring device.
  • the latter is sheltered from major sources of damage while retaining access to the sources of the noise to be picked up.
  • the fact of embedding the measuring device in the cooling pipe of the chimney in the manner described also makes it possible to circumvent the difficulties which could arise during cleaning operations in the event that the system is housed independently in the chimney. , eg by suspension. Indeed the system would constitute in this case an obstacle and would not fail to be damaged during the cleaning operations which necessarily take place in harsh conditions.
  • the circular cell (20) which has a water cooling circuit with the inlet mouths, resp. outlet (21) resp. (22).
  • the cell (20) has a central orifice (23) with a diameter of about 100 mm.
  • a flexible seal (24) Between the cell (20) and the crimp (11) is a flexible seal (24).
  • the cell (20) is in turn connected to the enclosure (40) which contains the acoustic sensor. Between the cell (20) and the enclosure (40) is the sound pickup element (30) which is a disc, the central part of which forms a blunt flare (31). The disc (30) touches the cylindrical cell (20) opposite each other, which has the effect of cooling the disc (30). Its other side touches a flexible seal (25) interposed between the disc (30) and the cell (20).
  • the cell (20), disc (30), seal 125) and enclosure (40) assembly is connected using the bolts (26).
  • the enclosure (40) comprises the acoustic tube (50) which is housed in the tube (51) through which a stream of nitrogen (N2) passes, which escapes through the orifice of the flared part (31) of the sound recording element.
  • the tube (50) which may have a length greater than 3 m, leads to the microphone, not shown.
  • fig. 3 shows essentially the same cell assembly (20), disc (30), seal (25), enclosure (40) as in fig. 2.
  • toroidal rings (70) ensure that the respective distances between the perforated capsule (55) and the membrane (56) and between the membrane (56) and the microphone (60) are constant and reproducible.
  • the microphone (60) is held in place by means of a spring (57).
  • the terminal part of the enclosure (40) is closed by means of a plastic padding.
  • flexible insulations (24) in FIG. 2 and (25) in fig. 2 and in fig. 3 to largely eliminate mechanical vibrations and shocks.
  • the electronic part of the measurement system according to the invention comprises several filters which eliminate noise of undesirable frequencies in the present context and which leave only the sounds which are taken into account for the measurements to be taken. carry out.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)
EP80630037A 1979-09-28 1980-08-28 System zur Bestimmung der Höhe und des physikalischen Zustandes der Schlacke in einem metallurgischen Gefäss Expired EP0029796B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80630037T ATE8800T1 (de) 1979-09-28 1980-08-28 System zur bestimmung der hoehe und des physikalischen zustandes der schlacke in einem metallurgischen gefaess.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU81740A LU81740A1 (fr) 1979-09-28 1979-09-28 Systeme de mesure de l'epaisseur de la couche de scorie dans un recipient metallurgique et pour l'appreciation de son etat physique
LU81740 1979-09-29

Publications (2)

Publication Number Publication Date
EP0029796A1 true EP0029796A1 (de) 1981-06-03
EP0029796B1 EP0029796B1 (de) 1984-08-01

Family

ID=19729256

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80630037A Expired EP0029796B1 (de) 1979-09-28 1980-08-28 System zur Bestimmung der Höhe und des physikalischen Zustandes der Schlacke in einem metallurgischen Gefäss

Country Status (11)

Country Link
US (1) US4368877A (de)
EP (1) EP0029796B1 (de)
JP (1) JPS5658917A (de)
AT (1) ATE8800T1 (de)
AU (1) AU539411B2 (de)
BR (1) BR8005978A (de)
CA (1) CA1159946A (de)
DE (1) DE3068798D1 (de)
ES (1) ES8106809A1 (de)
LU (1) LU81740A1 (de)
ZA (1) ZA805866B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0130960A2 (de) * 1983-06-06 1985-01-09 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Verfahren zum Überwachen des Schäumens von Schlacke

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA835649B (en) * 1982-08-25 1984-04-25 British Steel Corp Lancing in electric arc steelmaking
AT392801B (de) * 1989-06-05 1991-06-25 Voest Alpine Ind Anlagen Verfahren zur schlackenfuehrung in einem blasstahlkonverter
KR100406371B1 (ko) * 1998-12-24 2004-01-24 주식회사 우진 슬래그두께측정장치및방법
US6787099B2 (en) * 2002-05-10 2004-09-07 Luis Paredes Rojas Mechanical waves generator system in a converter or pyrometallurgical furnace
US6790406B2 (en) * 2002-05-10 2004-09-14 Luis Paredes Rojas Mechanical waves generator system in a converter or pyrometallurgical furnace
US6805831B2 (en) * 2002-05-10 2004-10-19 Luis Paredes Rojas Mechanical waves generator system in a converter or pyrometallurgical furnace
US6786082B2 (en) * 2002-05-13 2004-09-07 Luis Paredes Rojas System for a non-invasive online continuous measurement of phase levels in converters or pyrometallurgical furnaces
US6792358B2 (en) * 2002-05-13 2004-09-14 Luis Paredes Rojas System for a non-invasive online continuous measurement of phrase levels in converters or pyrometallurgical furnaces
US6836734B2 (en) * 2002-05-13 2004-12-28 Luis Paredes Rojas System for a non-invasive online discrete measurement of phase levels in converters or pyrometallurgical furnaces
KR100671673B1 (ko) 2005-03-09 2007-01-19 삼성에스디아이 주식회사 다중 진공증착장치 및 제어방법
EP1918703B1 (de) * 2007-02-07 2015-06-24 Tata Steel UK Limited Schallemissionskontrolle der Schlackendicke in einem Stahlherstellungsprozess
KR100905583B1 (ko) * 2007-12-27 2009-07-02 주식회사 포스코 소음치를 이용한 슬래그 두께 측정방법 및 용강의 탈황방법

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2837874A1 (de) * 1977-08-30 1979-03-15 Hoogovens Ijmuiden Bv Konverter zur stahlherstellung

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE819246C (de) * 1949-09-11 1951-10-31 Josef Dr-Ing Dr Habi Klaerding Herstellen von Thomasstahl in gleichbleibender Guete
GB778407A (en) * 1953-02-13 1957-07-10 Max Planck Inst Eisenforschung Improvements relating to methods of and apparatus for controlling the course of metallurgical processes
GB976158A (en) * 1961-09-13 1964-11-25 Centre Nat Rech Metall The control of steel manufacturing processes
FR1430843A (fr) * 1965-04-29 1966-03-04 Centre Nat Rech Metall Installation pour le contrôle de l'opération d'affinage de la fonte
LU50939A1 (de) * 1966-04-20 1966-10-20
AT297073B (de) * 1969-04-15 1972-03-10 Voest Ag Verfahren zur Messung der Dicke der Schlackenschicht auf metallischen Bädern, insbesondere auf durch Vakuumbehandlung zu entgasenden Schmelzen
US3799763A (en) * 1972-05-12 1974-03-26 Pennsylvania Engineering Corp Method and apparatus for cooling the exhaust gas system of metallurgical vessels
US4135915A (en) * 1973-12-12 1979-01-23 Gec Mechanical Handling Limited Kinetic energy monitor
US4149877A (en) * 1974-06-27 1979-04-17 Centre De Recherches Metallurgiques, Centrum Voor Research In De Metallurgie Controlling pig iron refining
LU71228A1 (de) * 1974-10-31 1976-03-17
LU71261A1 (de) * 1974-11-08 1976-09-06
US4040819A (en) * 1976-08-06 1977-08-09 Rounds Gerald L Basic oxygen steel furnace and process

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2837874A1 (de) * 1977-08-30 1979-03-15 Hoogovens Ijmuiden Bv Konverter zur stahlherstellung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0130960A2 (de) * 1983-06-06 1985-01-09 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Verfahren zum Überwachen des Schäumens von Schlacke
EP0130960A3 (de) * 1983-06-06 1986-04-02 CENTRE DE RECHERCHES METALLURGIQUES CENTRUM VOOR RESEARCH IN DE METALLURGIE Association sans but lucratif Verfahren zum Überwachen des Schäumens von Schlacke

Also Published As

Publication number Publication date
ATE8800T1 (de) 1984-08-15
ES495369A0 (es) 1981-08-01
ES8106809A1 (es) 1981-08-01
LU81740A1 (fr) 1981-04-17
JPS5658917A (en) 1981-05-22
EP0029796B1 (de) 1984-08-01
US4368877A (en) 1983-01-18
AU539411B2 (en) 1984-09-27
CA1159946A (fr) 1984-01-03
DE3068798D1 (en) 1984-09-06
BR8005978A (pt) 1981-03-31
ZA805866B (en) 1981-09-30
AU6278580A (en) 1982-03-18

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