EP2956559B1 - Tilting converter - Google Patents

Tilting converter Download PDF

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Publication number
EP2956559B1
EP2956559B1 EP14709565.7A EP14709565A EP2956559B1 EP 2956559 B1 EP2956559 B1 EP 2956559B1 EP 14709565 A EP14709565 A EP 14709565A EP 2956559 B1 EP2956559 B1 EP 2956559B1
Authority
EP
European Patent Office
Prior art keywords
container
supporting ring
support
suspension devices
converter according
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.)
Active
Application number
EP14709565.7A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2956559A1 (en
Inventor
Günther Staudinger
Peter ILLECKER
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.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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.)
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Publication date
Application filed by Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Priority to PL14709565T priority Critical patent/PL2956559T3/pl
Publication of EP2956559A1 publication Critical patent/EP2956559A1/en
Application granted granted Critical
Publication of EP2956559B1 publication Critical patent/EP2956559B1/en
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Anticipated expiration legal-status Critical

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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
    • C21C5/4633—Supporting means
    • 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
    • C21C5/50—Tilting mechanisms for converters

Definitions

  • the present invention refers to a tiltable converter provided with a suspension system of the converter container, said suspension system connecting said container to a support ring.
  • Converters are tiltable metallurgical vessels which are used for producing or treating liquid metals and metal-alloys.
  • the converter vessel is supported by means of several suspension elements which are arranged underneath or on top of a trunnion ring and are fixed with one of their ends to the converter vessel and with their other ends to the trunnion ring.
  • the main object of an oxygen converter is to convert the cast iron produced in the blast furnace into raw liquid steel, which can be then refined in the secondary steel production department.
  • Converters can also be e.g. used for de-vanadization or de-phosphorization of liquid hot-metal to so called e.g. semi-hot-metal which can be charged to an oxygen converter for further treatment.
  • B.O.F. Base Oxygen Furnace
  • the B.O.F. substantially is a furnace, it is also subject to significant thermal expansions. Due to this effect the converter is mantled by a trunnion ring with a determined clearance.
  • Said converter consists of a container or vessel, defining the reactor and having a substantially cylindrical shape, supported by a support ring or mantle trunnion ring, surrounding the container and suitably spaced therefrom, provided with two diametrically opposed supporting pins ("trunnions”), the assembly being supported by two supports anchored to the ground.
  • the container rotation control is keyed or fixed onto one of the two supporting pins.
  • Said converter has a suspension system based on lamella type elements for the vertical support of the converter within the trunnion ring.
  • Said lamella type elements are arranged underneath the trunnion ring, taking into account the vertical position of the converter with the mouth facing upwards.
  • the support of the converter in horizontal position, when the converter is rotated by + 90 or - 90 degrees starting from said vertical position, is provided by means of rigid supports fixed to the vessel and rigid supports fixed to trunnion ring.
  • Publication WO2011069395 discloses a suspension made of blocking mechanisms and pendulums which gives also problems in dirty and warm environment and are prone to rapid wear.
  • Primary object of the present invention is to provide a suspension device for a container of a tilting converter, connecting said container to the support ring, which allows both avoiding shock loads as well as overloading in the areas between the device part fixed to the container and the device parts fixed to the support ring, and to compensate the thermal expansions, while being able to work reliably and with reduced wear in dirty and hot environments.
  • a further object of the invention is to provide a converter having a suspension system capable to absorb the vibrations caused by the melting process. Therefore, the present invention proposes to achieve the above-discussed objects by providing a tilting converter which, in accordance with claim 1, comprises:
  • the suspension devices of the invention have been designed for the horizontal support of the converter, that is for the sustenance of the loads when the converter assumes horizontal position (e.g. for tapping of charging, etc.). Thanks to the fact that a part of the horizontal loads, about 20 to 30%, is supported by the lamella elements that mainly support the loads produced by the converter in vertical position, the horizontal suspension can be designed with smaller constituting elements.
  • the suspension system can be optimized in such a way that the designed thermal expansion of the second supports lugs, fixed to the container shell, is identical to the clearances between the elastic beams and said second support lugs. This means the thermal expansion is compensated by the clearance in order to avoid overloading and then all components are in full contact to each other.
  • the load distribution between the second side support lugs and a possible third middle side support lug can be varied as well.
  • the beams can be also shaped as rectangular or square plates, with dimensions appropriately designed. In the description and in the claims it is referred indifferently to beams or plates, without limiting the scope of the invention.
  • the horizontal suspension devices of the converter according to the invention have the following advantages:
  • the excellent precision of the centring between container and support ring allows the thermal expansions of the container, caused by the high temperatures reached during the conversion process, without any interference between container and support ring.
  • a further advantage is that the whole structure of the converter, protuberances included, is configured so as to be inserted within a sphere, the radius of which is determined by the layout requirements of the plant comprising the converter.
  • Said converter comprises:
  • the first suspension devices are designed for the horizontal support of the converter, when the container is rotated by up to + 90 or - 90 degrees with respect to the position of Figure 1 a or 2a.
  • the second suspension devices are designed for mainly supporting the loads of the converter in a vertical position, i.e. in a position with the mouth 7 of the container facing upwards ( Figure 1 a or 2a). Due to their structure and disposition the second suspension devices contribute also to supporting part of loads generated by the converter when it is rotated by up to + 90 or - 90 degrees with respect to the position of Figure 1 a or 2a, thus allowing a reduction in dimension of the first suspension devices.
  • a plane Y-Z which can be considered an "equatorial" plane of the converter
  • a plane X-Z both the planes orthogonal to the plane X-Y
  • Container 1 comprises a cylindrical central area and two truncated cone areas, each truncated cone area being arranged laterally to said cylindrical central area.
  • a first truncated cone area is welded or fixed at one end to said cylindrical central area while at the other end it comprises the loading mouth 7 of the container.
  • a second truncated cone area is welded or fixed at one end to said cylindrical central area, on the opposite side with respect to the first truncated cone area, while at the other end it comprises the bottom of container 1.
  • Other examples of container may have said second area having a different shape with respect to the truncated cone shape, for example spherical-bowl-shaped or having another appropriate geometrical shape.
  • Support ring 2 arranged at central area of container 1, is hollow and preferably has a rectangular cross-section.
  • Ring 2 has a first surface 20 facing the part of the container comprising loading mouth 7; a second surface 21, opposite the first surface 20, facing the part of container 1 comprising the bottom thereof; a third internal surface facing the central part of the container; a fourth external surface opposite the internal surface.
  • the converter is provided with at least two first suspension devices, designed for the horizontal support of the converter.
  • Said first suspension devices are arranged substantially parallel to the plane Y-Z substantially orthogonal to the plane Y-X, and are substantially symmetrically arranged with respect to the plane X-Z underneath ( Figure 1a ) or above ( Figure 2a ) the supporting ring 2.
  • the converter is provided with two pairs of first suspension devices: a first pair of first suspension devices being arranged at a first side of the plane Y-Z and a second pair of first suspension devices being arranged at a second side of the plane Y-Z.
  • Said first suspension devices comprise (see in particular Figures 4 and 5 ):
  • First and second lateral structures are arranged substantially symmetrically with respect to the central structure.
  • each lateral structure comprises two first support lugs 14, 15, spaced apart to each other, and a group of elastic beams 11 arranged adjacent and parallel to each other and supported at ends thereof by said two first support lugs 14, 15.
  • the central structure comprises a second support lug 12, arranged transversally to and between the two groups of elastic beams 11 of said lateral structures, whereby the elastic beams 11 act as resilient support or bumper for the second support lug 12 in case of deviation from a rest position, defined by the position of the converter with mouth facing upwards ( Figures 1 a, 2a ).
  • the elastic beams can be, if necessary shaped as plates, e.g. rectangular with thickness of magnitude much smaller than the other two dimensions.
  • the first suspension devices are each arranged at a respective load-bearing pin 3, 4 and transversally to the plane X-Y.
  • the second support lug 12 of each first suspension device is substantially parallel to the surfaces 20, 21 of the supporting ring 2 and substantially perpendicular to the respective groups of elastic beams 11.
  • the beams 11 are, thus, arranged perpendicular to the surfaces 20, 21 of the supporting ring 2.
  • the elastic beams 11 are in the form of metallic plates.
  • the elastic beams 11 of each group are arranged side by side and freely arranged between the first support lugs 14, 15 and mechanical stops 16 and 17.
  • the mechanical stops 16 and 17 are, for example, arranged at the ends and / or on top of the elastic beams 11 and overlap partially to the external surfaces of the support lugs 14 and 15.
  • the beams 11 are arranged more or less freely in order to allow any deformation. Therefore the beams 11 are not rigidly fixed but just kept in position by the mechanical stops 16 and 17 This feature gives maximum elasticity and avoids additional stress caused by restriction of thermal expansion. This feature provides the additional advantage that these elastic beams 11 can be changed or be adjusted after a certain time of operation in order to change or adjust the mechanical characteristic of the bumper.
  • Said elastic beams 11 of each group in the position of the converter with mouth 7 facing upwards, have clearances with respect to the respective second support lug 12 or are in direct contact with said respective second support lug 12.
  • the thermal expansion of the support lugs 12, fixed to the container shell is compensated by an elastic deformation of said elastic beams 11.
  • the second support lugs 12 have a base 22 proximal to the converter shell and a head 23 shaped so as to be inserted in the space between the two groups of elastic beams 11.
  • the second support lugs 12 have sides of the head 23 having a convex shape 24 adapted to get into contact with at least one of the respective groups of elastic beams 11.
  • the contact area of the side of support lugs 12 with the beams 11 is shaped spherically, preferably spherical-bowl-shaped.
  • the support lugs 12 can, thus, move along directions parallel to the three axes X, Y and Z.
  • the support on the trunnion ring 2 is made by the two supports lugs 14, 15, one on each end of the elastic beams 11 which are permanently in contact with said elastic beams 11.
  • a third support lug 13 is provided in both the lateral structures and is placed between the two first support lugs 14, 15.
  • the third support lug 13 is arranged parallel and in a central position with respect to the corresponding two first support lugs 14, 15.
  • Each third support lug 13, in a position of the converter with mouth 7 facing upwards, has advantageously a clearance with respect to the corresponding group of elastic beams 11.
  • the middle support lugs 13 get in contact with the elastic beams 11 at a determined tilting angle, limiting the deformation of the elastic beams 11 and taking over part of the loads.
  • each third support lug 13, also in the rest position, is in direct contact with the respective group of elastic beams 11.
  • a further embodiment of the invention (not shown in detail), suitable e.g. for converters of reduced sizes, does not need the third support lugs 13, whereby said support lugs 13 are not provided.
  • groups of vertical suspension devices arranged substantially equally spaced apart from one another along the supporting ring 2, which comprise lamella suspension elements 9, in which the lamellae 10 are provided in a build-in configuration, restrained at a first end thereof to the container 1 and at a second end thereof to the supporting ring 2.
  • said groups of vertical suspension devices comprise elastic bars (not shown), in which said bars are provided in a build-in configuration, restrained at a first end thereof to the container 1 and at a second end thereof to the supporting ring 2.
  • Each horizontal suspension device is arranged between two respective groups of vertical suspension devices directly underneath the supporting ring 2 ( Figures 1 a, 1 b), or is arranged between two respective groups of vertical suspension devices in a projection area above the supporting ring 2 ( Figures 2a, 2b ).
  • the two supporting pins 3, 4, actuated by at least one tilting mechanism, allow the rotation of the converter about axis Y.
  • the converter usually moves from a first position in which it is in a vertical position with the loading mouth 7 facing upwards ( Figure 1 a or 2a) to a second position inclined by around 30° with respect to the vertical, by means of rotation of the supporting pins 3, 4 in a first direction of rotation. In this second position, loading of the liquid cast iron and scrap metal takes place through mouth 7.
  • One or more lances introduced into the container by means of mouth 7, provide for insufflation of oxygen for a predetermined period of time so as to drastically lower the content of carbon and reduce the concentration of impurities such as sulphur and phosphorus.
  • the converter moves from the first position in Figure 1 a to a third position inclined by up to + 90 or - 90° with respect to the vertical, by means of rotation of the supporting pins 3, 4 in a second direction of rotation, opposite to the first one.
  • the tapping of the liquid steel takes place usually by means of a tapping hole provided in the container of the converter.
  • the load determined by the sum of the weights of container 1, liquid cast iron and scrap metal, is unloaded to the ground by means of support ring 2, the horizontal and vertical suspension devices, the tilting pins 3, 4 and the related supports.
  • the configuration of the horizontal and vertical suspension devices allows the weight to be absorbed for any inclination of container 1.
  • the vertical suspension devices act substantially as e.g. tie-rods for an inclination angle of the converter with respect to the vertical equal to 0°; on the other hand, they act exclusively as struts for an inclination angle equal to 180°, and gradually act both as e.g. tie-rods and as struts for angles different from 0° or 180°.
  • the position with inclination angle equal to 180°, with loading mouth 7 facing downwards, is provided for tapping slag, cleaning the container, once emptied or other reasons (e.g. keeping the converter hot).
  • the horizontal suspension devices ensure optimal support, stability and rigidity of the container.
  • Said horizontal suspension devices serve principally to support the weight of the container in a direction transverse to axis Y when this is inclined by up to + 90 or - 90° (tapping position) and to support the component of load orthogonal to the axis X of the converter in any other condition.
  • the load on the vertical suspension devices gradually goes from a maximum value with converter in the vertical position to a minimum value with converter in the horizontal position, while the load on the horizontal suspension devices gradually goes from substantially zero to a maximum value when the converter moves from the horizontal position to the vertical position.
  • the moments which are generated with the rotation of the converter about axis Y are perfectly absorbed by the configurations of the horizontal and vertical suspension devices.
  • the first suspension devices comprise:

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Adjustment Of Camera Lenses (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Vibration Prevention Devices (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
EP14709565.7A 2013-02-12 2014-02-12 Tilting converter Active EP2956559B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL14709565T PL2956559T3 (pl) 2013-02-12 2014-02-12 Konwerter przechylny

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000199A ITMI20130199A1 (it) 2013-02-12 2013-02-12 Convertitore ribaltabile
PCT/EP2014/052721 WO2014124963A1 (en) 2013-02-12 2014-02-12 Tilting converter

Publications (2)

Publication Number Publication Date
EP2956559A1 EP2956559A1 (en) 2015-12-23
EP2956559B1 true EP2956559B1 (en) 2017-01-11

Family

ID=48096011

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14709565.7A Active EP2956559B1 (en) 2013-02-12 2014-02-12 Tilting converter

Country Status (7)

Country Link
EP (1) EP2956559B1 (pl)
BR (1) BR112015019359A2 (pl)
IT (1) ITMI20130199A1 (pl)
PL (1) PL2956559T3 (pl)
RU (1) RU2614225C2 (pl)
UA (1) UA113346C2 (pl)
WO (1) WO2014124963A1 (pl)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023006733A1 (en) 2021-07-28 2023-02-02 Sms Group Gmbh Suspension device for a converter
US11761047B2 (en) 2021-07-28 2023-09-19 Sms Group Gmbh Suspension device for a converter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101794589B1 (ko) * 2016-04-21 2017-12-01 주식회사 포스코건설 전로 지지장치
CN113388714B (zh) * 2021-06-16 2022-05-10 中冶赛迪工程技术股份有限公司 转炉自适应吊挂结构

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1903685C2 (de) 1969-01-25 1975-07-17 Gutehoffnungshuette Sterkrade Ag, 4200 Oberhausen Metallurgisches Kippgefäß, Insbesondere Konverter zum Frischen von Roheisen
AT504079B1 (de) * 2006-09-13 2008-09-15 Siemens Vai Metals Tech Gmbh Verfahren zum abgiessen von schmelze aus einem kippbaren metallurgischen gefäss sowie anlage zur durchführung des verfahrens
AT504664B1 (de) 2007-02-02 2008-07-15 Siemens Vai Metals Tech Gmbh Kippbarer konverter
CN101717838A (zh) * 2009-12-11 2010-06-02 中冶赛迪工程技术股份有限公司 一种四点连杆机构转炉炉壳和托圈的联接装置
CN201560209U (zh) * 2009-12-11 2010-08-25 中冶赛迪工程技术股份有限公司 一种转炉炉壳和托圈的联接装置
ITMI20111277A1 (it) * 2011-07-08 2013-01-09 Danieli Off Mecc Convertitore ad ossigeno ribaltabile

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023006733A1 (en) 2021-07-28 2023-02-02 Sms Group Gmbh Suspension device for a converter
US11761047B2 (en) 2021-07-28 2023-09-19 Sms Group Gmbh Suspension device for a converter

Also Published As

Publication number Publication date
BR112015019359A2 (pt) 2019-03-19
PL2956559T3 (pl) 2017-07-31
RU2614225C2 (ru) 2017-03-23
UA113346C2 (xx) 2017-01-10
EP2956559A1 (en) 2015-12-23
ITMI20130199A1 (it) 2014-08-13
RU2015138772A (ru) 2017-03-21
WO2014124963A1 (en) 2014-08-21

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