EP3042966A1 - Procede et dispositif de fonctionnement d'une lance de soufflage dans un convertisseur - Google Patents

Procede et dispositif de fonctionnement d'une lance de soufflage dans un convertisseur Download PDF

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Publication number
EP3042966A1
EP3042966A1 EP16150685.2A EP16150685A EP3042966A1 EP 3042966 A1 EP3042966 A1 EP 3042966A1 EP 16150685 A EP16150685 A EP 16150685A EP 3042966 A1 EP3042966 A1 EP 3042966A1
Authority
EP
European Patent Office
Prior art keywords
lance
fermentation
diameter
converter
distribution
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
EP16150685.2A
Other languages
German (de)
English (en)
Other versions
EP3042966B1 (fr
Inventor
Gernot Walter
Lutz Rose
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.)
SMS Group GmbH
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SMS Group GmbH
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Filing date
Publication date
Application filed by SMS Group GmbH filed Critical SMS Group GmbH
Publication of EP3042966A1 publication Critical patent/EP3042966A1/fr
Application granted granted Critical
Publication of EP3042966B1 publication Critical patent/EP3042966B1/fr
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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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4606—Lances or injectors
    • C21C5/4613—Refractory coated lances; Immersion lances
    • 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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/4673—Measuring and sampling 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
    • F27D21/00—Arrangement of monitoring devices; Arrangement of safety devices
    • F27D21/0021—Devices for monitoring linings for wear
    • 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
    • F27D21/00—Arrangement of monitoring devices; Arrangement of safety devices
    • F27D21/02—Observation or illuminating 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
    • F27D21/00—Arrangement of monitoring devices; Arrangement of safety devices
    • F27D21/02—Observation or illuminating devices
    • F27D2021/026—Observation or illuminating devices using a video installation

Definitions

  • the invention relates to a method and an apparatus for operating a lance in a steelmaking converter.
  • the lance is used to inflate oxygen to a liquid molten metal in a Basic Oxygen Steel Making converter, an Argon Oxygen Decarburisation converter, in a Conversion ARCing ConArc furnace, in a VOD plant or in a plant for the crude steel Heraeus RH -Method.
  • the water-cooled lance moves from the top through an opening in the cooling chimney in the middle in the converter vessel and is lowered so far until the intended inflation height is reached.
  • an oxygen valve is automatically opened and a defined amount of oxygen is blown onto the surface of the liquid molten metal by the lance head attached to the end of the lance.
  • the lance head is made of copper.
  • openings that are designed as a Laval nozzle and accelerate the oxygen to supersonic speed.
  • the number of Laval nozzles typically varies between 1 and 6.
  • the Laval nozzle is arranged centrically, circular in the case of multi-hole lance heads.
  • the oxygen from the multi-hole lances does not impinge perpendicular to the bath surface, but at a nozzle angle of attack that is between 10 ° and 23 °.
  • the oxygen then hits the surface of the melt, where it creates an oscillating blister.
  • the oxygen applied in this way to the surface of the melt ensures an intensive decarburization reaction in the liquid molten metal and thus positively alters its material properties.
  • the lowering of the lance can be done in stages.
  • the ignition of the oxygen jet takes place with the carbon present in the melt.
  • the lance is very high, about 270 cm above the liquid molten metal, in order to avoid possible contact with the charged solids (scrap).
  • water leaks can lead to dangerous steam explosions.
  • the lance height is lowered by approx. 25 - 35 cm per level.
  • the goal here is to increase the reaction rate and to control too early slag formation.
  • the middle stages cause early iron oxide formation, which generates increased slag formation.
  • Lance height is an empirical trade-off between achieving high decarburization rates and proper slag formation.
  • lance height and oxygen flow rate increase in some cases to control the viscosity and chemical reactivity of the slag by increasing the FeO content.
  • small metal droplets are torn from the melt and form together with the slag formers, e.g. CaO / MgO, a foamy slag that can rise or even boil up to the converter mouth.
  • the slag formers e.g. CaO / MgO
  • the position of the lance is important to the functioning of the inflation process.
  • step 1 the slag is over-stirred and over-oxidized with higher percentages of FeO.
  • blower lance position is very low, metal droplets are ejected heavily or sparking or sparking is visible; both cause heavy and dangerous metallic deposits, called bears, at the lance and in the lower exhaust hood.
  • the attachments to the lance are not always symmetrical. As a result of asymmetrical metallic adhesions on the lance, uniform cooling of the lance surface is no longer possible, as a result of which distortion or curvature of the lance body can occur.
  • a weight monitoring of the lance gives no information about the geometry of the baking mantle.
  • a short thick-walled caking mantle may have the same weight as a thin-walled caking mantle.
  • a visual assessment of the lance condition via a video surveillance system depends on the operator. Is the operator experienced, what are the visibility conditions, is the operator under time pressure? These are many influencing factors which influence an accurate assessment of the state of the lance.
  • a visual on-site assessment of lance conditions by steelworkers is the norm in many steel mills and not without risk.
  • Reaction distortions in the converter can spontaneously lead to slag and steel ejection.
  • dust, heat and CO formation make it difficult to work in these areas. Therefore, it is desirable to minimize activities in this area.
  • the invention has the object, a known method and a known device for operating a lance in a converter to the effect that the need for a change of the lance can be assessed better and risk-free for the operator.
  • This object is achieved by the method claimed in claim 1.
  • This is characterized in that the lance is photographed with its fermentation by a plurality of cameras distributed in the circumferential direction of the lance, the resulting images being subjected to an image processing algorithm to determine the distribution of the diameter of the circumferential lance of the lance and the maximum diameter to investigate.
  • the term "algorithm” means a preferably digital image processing algorithm, typically for the stereo construction of the real dimensions / dimensions of the bear from the acquired images.
  • the algorithm also preferably includes a decision stage which compares the respective determined maximum diameter of the bear with a predetermined radial threshold. Once the algorithm determines that the diameter meets or exceeds the threshold, the decision stage issues a recommendation to the operator to replace the lances either immediately or after n further fusing processes.
  • the threshold may vary depending on the type of melting process or the size of the inner diameter of the lance mandrel.
  • the claimed method advantageously allows a fully automatic assessment of the fermentation on a lance with respect to whether the lance must be replaced before a next melting, because the fermentation is then possibly increased so much that they no longer by the lance dome on the chimney of the converter outside the converter could be promoted.
  • a determination of the diameter or the diameter distribution of the fermentation in the circumferential direction as well as the determination of the maximum diameter is much more accurate than possible in an assessment by an operator.
  • An operator can only visually estimate the diameter or size of the fermentation in view of the size of the opening of the lance dome.
  • the claimed method for the operating personnel at the converter is less risky, because it does not require any work by an operator in the vicinity of the converter in order to assess the need for a change of the lance.
  • the cameras take the images of the hardened lance during a ride of the lance in or out of the Converter continuously on. These images are then subjected to the algorithm to determine not only the distribution of the diameter of the fermentation in the circumferential direction, but optionally also the distribution of the diameter of the fermentation over a predetermined length range of the lance, for example, from the lower edge thereof.
  • the spatial shape of the bear can be determined on the lance.
  • the determination of the "distribution of the diameter of the fermentation” means the determination of the contour of the fermentation.
  • the contour of the fermentation is determined in a cross section transverse to the longitudinal axis of the lance.
  • the determination of the "distribution of the diameter of the fermentation over a predetermined length range of the lance” means a determination of the contour of the fermentation in the longitudinal direction of the lance.
  • the “maximum diameter” means the greatest thickness or width of the fermentation or the contour of the fermentation in a plane transverse to the longitudinal axis of the lance at a certain (circumferential) angle.
  • the optical determination of the radial diameter of the fermentation preferably takes place during each drive of the lance into the converter or out of the converter. This is advantageous because in this way it is avoided that the cured blow lance can no longer be transported away by the lance dome, because the fermentation has increased too much in one or more intermediate lance rides.
  • Illuminating the lance with backlight while it is being photographed advantageously results in a stronger contrast and thus an improved representation of the contour of the fermentation on the images.
  • the radial threshold for the maximum diameter of the fermentation in the circumferential direction is chosen smaller than the opening diameter of the lance dome of the converter. If the maximum diameter of the circumferential fermentation exceeds the radial threshold, the error signal signals the need to change the lance. The lance is then led by the lance dome at the chimney of the converter to the outside - if this has not already been done - and there freed from the bear.
  • the currently determined maximum diameter of the fermentation in the circumferential direction may also be smaller than the radial threshold value. Then, according to the invention, a prognosis for the temporal development of the diameter or the diameter distribution of the fermentation at the blow lance is made and displayed for the operating personnel. The prognosis indicates to the operating personnel, for example, how many more melting processes the lance can still remain in the converter without having to be replaced.
  • the prognosis for the temporal development of the diameter or the diameter distribution of the fermentation is determined according to the invention by observing the change with time of the thickness or the thickness distribution of the fermentation in a plurality of melting processes.
  • the thickness or the thickness distribution of the fermentation in a single melting operation according to the invention by comparing the original diameter or the original diameter distribution of the clean lance, d. H. the lance determined without fermentation, with the diameter or the diameter distribution of the fermentation of the lance after the melting process.
  • a marker for the radial threshold can be displayed.
  • the cross section through the lance can be displayed both in a plane perpendicular to the longitudinal axis of the lance and in the direction of the longitudinal axis of the lance.
  • thickness distribution or “contour” are given, these terms each have a thickness distribution or contour in the circumferential direction of the lance and / or in the longitudinal direction of the lance.
  • FIG. 1 shows a plan view of the device according to the invention.
  • the optical measuring device 150 which consists of a plurality of distributed in the circumferential direction of the lance 100 arranged cameras 142. These cameras are used to photograph the Blaslanze 100 with its Fermentation 130 from different perspectives.
  • an evaluation device 160 can be recognized which receives the images taken by the cameras via signal lines and subjects them to an algorithm so as to determine the diameter distribution and the maximum diameter of the fermentation 130 in the circumferential direction of the lance.
  • the evaluation device 160 is designed to generate an error signal when the determined maximum diameter of the fermentation of the lance exceeds a predetermined radial threshold.
  • lamps 145 for providing backlight when the lance 100 is photographed by the cameras 142 to increase the contrast of the images, if necessary.
  • the evaluation device 160 is connected to a display device 170, which determines the determined by the fully automatic algorithm contour of the fermentation, preferably together with the contours for the clean lance and more preferably also with the radial threshold for the maximum diameter of the contour and the error signal of the fermentation for the operator indicates.
  • FIG. 2 shows a converter 200 with a chimney 250 and an attached to the chimney lance dome 240 for retracting the lance 100 in the converter 200 or for moving the lance 100 from the converter.
  • the lance dome is positioned centrally above converter mouth 205; it has an opening diameter D.
  • the measuring device 150 with the plurality of cameras 142 may be arranged, for example, at the entrance of the lance dome 240 or on the converter mouth 220.
  • FIG. 2 shows the initially clean blowing lance 100, ie the lance without fermentation in a parking position 210 outside the converter 200th
  • the lance 100 is positioned from the parking position 210 through the lance dome 240 and the converter throat 205 into a blowing position 220 in the converter above the molten metal 500 at the appropriate time.
  • a medium typically oxygen 400
  • the lance 100 is blown onto the molten metal 500 by the lance. It comes, as described in detail in the introduction, deposits of aufspritzender slag on the lance 100, ie the lance lances.
  • the fermentation can extend over a length range L of the lance, see FIG. 5 ,
  • the cured lance travels back through converter mouth 205 and lance dome 240 back to park position 210, as in FIG FIG. 6 shown.
  • the distribution of the diameter of the dressing 130 in the circumferential direction of the lance and the maximum diameter of the fermentation in the circumferential direction are first determined with the aid of the measuring device 150 according to the invention in cooperation with the evaluation device 160. This is done, as described in the general part of the description, by evaluating the images taken by the cameras 142 using an algorithm.
  • the maximum diameter of the fermentation in the circumferential direction - and preferably also above the level of the fermentation - is subsequently with a predetermined radial threshold, which is smaller than that Opening diameter D of the lance dome is compared.
  • the operator of the converter is informed via an error signal that a change of the lance is required or that the last used lance for further melting operations can not be used because then a return of the lance by the lance dome is no longer guaranteed.
  • the evaluation device 160 predicts the time of development of the diameter or diameter distribution of the fermentation at the lance 100 the operator of the converter off. For example, this prediction may indicate that the current lance can still be used for x smelting operations before there is a risk that their fermentation has grown so much that the lance that is being used can no longer be led out through the lance dome.
  • the thickness or the thickness distribution of the fermentation in a single melting process is determined according to the invention by comparing the original diameter d 0 or the original diameter distribution of the clean lance, ie the lance without fermentation, with the diameter or the diameter distribution of the fermentation of the lance after melting.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
EP16150685.2A 2015-01-09 2016-01-08 Procede et dispositif de fonctionnement d'une lance de soufflage dans un convertisseur Active EP3042966B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015200188.1A DE102015200188A1 (de) 2015-01-09 2015-01-09 Verfahren und Vorrichtung zum Betreiben einer Blaslanze in einem Konverter

Publications (2)

Publication Number Publication Date
EP3042966A1 true EP3042966A1 (fr) 2016-07-13
EP3042966B1 EP3042966B1 (fr) 2017-04-19

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EP (1) EP3042966B1 (fr)
DE (1) DE102015200188A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018220256A1 (fr) * 2017-05-29 2018-12-06 Outotec (Finland) Oy Procédé et agencement pour commander un brûleur d'un four de fusion de suspension
CN110728712A (zh) * 2019-09-26 2020-01-24 中冶赛迪工程技术股份有限公司 基于机器视觉的炉口定位方法、装置、存储介质及电子终端

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4247086A (en) 1979-01-22 1981-01-27 Kaiser Steel Corporation Lance hoisting and skull detecting apparatus for basic oxygen steelmaking furnaces
EP0162949A1 (fr) * 1984-04-27 1985-12-04 Nippon Steel Corporation Méthode et appareil pour mesurer les conditions de scorification dans un convertisseur
JP2007327124A (ja) 2006-06-09 2007-12-20 Nippon Steel Corp 転炉炉口の地金溶断方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4247086A (en) 1979-01-22 1981-01-27 Kaiser Steel Corporation Lance hoisting and skull detecting apparatus for basic oxygen steelmaking furnaces
EP0162949A1 (fr) * 1984-04-27 1985-12-04 Nippon Steel Corporation Méthode et appareil pour mesurer les conditions de scorification dans un convertisseur
JP2007327124A (ja) 2006-06-09 2007-12-20 Nippon Steel Corp 転炉炉口の地金溶断方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
J. P. BOSQUET ET AL.: "Mise en service d'une lance de post-combustion ä I'aciere de Sollac Lorraine", LA REVUE DE METALLURGIE, July 2001 (2001-07-01)
P. NYSSEN (CRM ET AL.: "La formation des loups sur les lances des convertisseurs ä I'oxygene", LA REVUE DE METALLURGIE, April 1983 (1983-04-01)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018220256A1 (fr) * 2017-05-29 2018-12-06 Outotec (Finland) Oy Procédé et agencement pour commander un brûleur d'un four de fusion de suspension
US10746471B2 (en) 2017-05-29 2020-08-18 Outotec (Finland) Oy Method and arrangement for controlling a burner of a suspension smelting furnace
EA038464B1 (ru) * 2017-05-29 2021-08-31 Оутотек (Финлэнд) Ой Способ и устройство для управления горелкой в печи для плавки во взвешенном состоянии
CN110728712A (zh) * 2019-09-26 2020-01-24 中冶赛迪工程技术股份有限公司 基于机器视觉的炉口定位方法、装置、存储介质及电子终端

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Publication number Publication date
DE102015200188A1 (de) 2016-07-14
EP3042966B1 (fr) 2017-04-19

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