[go: up one dir, main page]

WO1998048229A1 - Economiseur pour four electrique a arc - Google Patents

Economiseur pour four electrique a arc Download PDF

Info

Publication number
WO1998048229A1
WO1998048229A1 PCT/GB1998/001003 GB9801003W WO9848229A1 WO 1998048229 A1 WO1998048229 A1 WO 1998048229A1 GB 9801003 W GB9801003 W GB 9801003W WO 9848229 A1 WO9848229 A1 WO 9848229A1
Authority
WO
WIPO (PCT)
Prior art keywords
annulus
fluid
furnace
inlets
annuli
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.)
Ceased
Application number
PCT/GB1998/001003
Other languages
English (en)
Inventor
Peter Fox
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.)
P HOWARD INDUSTRIAL PIPEWORK SERVICES Ltd
Original Assignee
P HOWARD INDUSTRIAL PIPEWORK SERVICES Ltd
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 P HOWARD INDUSTRIAL PIPEWORK SERVICES Ltd filed Critical P HOWARD INDUSTRIAL PIPEWORK SERVICES Ltd
Priority to AU73418/98A priority Critical patent/AU7341898A/en
Publication of WO1998048229A1 publication Critical patent/WO1998048229A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • F27D99/0075—Gas curtain seals
    • 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; Electric arc furnaces ; Tank furnaces
    • F27B3/10—Details, accessories or equipment, e.g. dust-collectors, specially adapted for hearth-type furnaces
    • 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
    • F27D9/00—Cooling of furnaces or of charges therein
    • 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
    • H05B7/12—Arrangements for cooling, sealing or protecting electrodes

Definitions

  • the present invention relates to electric arc furnaces and similar installations and in particular, to apparatus and method for inhibiting fumes and pollution from furnaces or similar installations and preventing erosion of the electrodes used in such furnaces or installations .
  • Figure 1 shows in plan view a conventional economiser having three units each comprising a single stainless steel annulus 2 having an inlet 4.
  • the annulus comprises an open channel through which compressed air or inert gas, such as Argon or Nitrogen, supplied through the inlet 4, is passed.
  • the units are located on the furnace roof centre and the electrodes 6 are passed through apertures formed in an electrode holder located in the centre of the annulus.
  • the inert gas is continuously supplied to the annulus and dissipates into the interior of the furnace.
  • the economiser creates a positive pressure to stop the ingress of gases.
  • the present invention has been made from a consideration of the disadvantages with the conventional economiser and in order to provide an improved economiser which overcomes one or more of these disadvantages .
  • a preferred object of the present invention is to provide an improved economiser having, in use, an extended lifespan. Further preferred objects of the invention are to provide an economiser which effectively reduces wear of electrodes and which allows furnace pollution to be controlled or inhibited.
  • apparatus for mounting in or on a furnace comprising fluid circulation means defining a fluid circulation path, having first and second path portions adapted, in use, to lie towards the exterior and interior of the furnace respectively.
  • the apparatus is adapted to be mounted in or on a furnace roof centre.
  • the apparatus is in the form of an annulus adapted to receive furnace electrodes probes or lances through the aperture formed in the centre thereof.
  • the apparatus comprises first and second annuli connected by an intermediate annulus.
  • the first and second annuli define the first and second path portions.
  • the intermediate annulus defines an intermediate path portion allowing fluid circulation between said first and second path portions.
  • One or, preferably, both of the first arid second annuli may comprise a housing having an internal spiral wall which defines a spiral pathway for fluid circulation around such annulus.
  • such spiral pathway extends from an outer edge of such housing towards the inner wall defining the aperture of the annulus.
  • first and second annuli may comprise a series of concentric sections, typically of square or rectangular cross-section.
  • the concentric sections may be formed from box, e.g. rectangular or square, cross-section tubing which is bent to form the required curvature. Box section tubing is particularly suitable for use in constructing large diameter annuli.
  • angles For medium sized annuli, it may be more appropriate to use two angles to form the effective box section, such angles being welded together.
  • the weld joints or seals may be concealed by the outer surfaces of the sections.
  • Use of welded angles rather than integral box sections avoids undesirable deformation when the concentric sections are formed.
  • box section is difficult to roll effectively without deformation whereas less deformation is obtained with angle sections since stretching and thinning can be avoided.
  • the angles are rolled steel angles.
  • two or more, typically three, concentric sections are provided which are welded together to form the annulus.
  • Coolant flow apertures may be provided for fluid communication between adjacent tube lengths.
  • the archimedes spiral pathway annulus is preferably used for smaller diameter annuli.
  • annuli typically the annuli, whether constructed as an archimedes spiral or box or angled sections, controls the water flow and hence the heat transfer.
  • each of said first and second annuli comprises a fluid inlet and/or outlet.
  • the first annulus comprises a fluid inlet and the second annulus comprises a fluid outlet.
  • such inlet/outlet is provided adjacent the outer edge of the annulus .
  • the intermediate annulus comprises an annular housing having inner and outer annular walls defining a fluid receiving space therebetween.
  • each end of the intermediate annulus is respectively connected to the first and second annulus adjacent the inner regions thereof.
  • the height of the intermediate annulus defines the spatial separation of the first and second annuli.
  • fluid may be pumped through an inlet of the first annulus, up through the intermediate annulus and out through an outlet of the second annulus.
  • the diameter of the aperture of the second annulus is less than the diameter of the intermediate and/or first annulus so that when an electrode holder having a diameter substantially corresponding to that of the second annulus aperture is located therein a gap is formed between the holder and the intermediate and/or first annulus.
  • the apparatus comprises means for creating a positive pressure in the region of the apparatus, particularly in the gap.
  • Such means may be as described below.
  • the apparatus is adapted to receive liquid such as water.
  • the fluid circulation path is substantially closed or sealed along the length thereof so that fluid or liquid input or output is by means of the inlet and outlets only.
  • the invention further provides a cooling system for a furnace comprising apparatus as described above, pump and cooling fluid such as water or water based fluids.
  • apparatus for mounting in or on a furnace comprising annular means adapted to receive an electrode holder therein and means for creating a positive pressure in a gap formed in use between an inner surface of said annular means and said electrode holder.
  • the annular means comprises a fluid circulation means as described above.
  • the annular means comprises a second annulus adapted to lie in use on the exterior side of the furnace and having a second aperture diameter corresponding substantially to the diameter of an electrode holder to be located therein and a first annulus adapted to lie in use on an interior side of the furnace and having a first aperture diameter greater than said second diameter.
  • Such first annulus may comprise an intermediate annulus as described above.
  • said means for creating a positive pressure comprises one or more inlets extending through the annular means and communicating with said gap.
  • such inlets are radial and preferably a plurality of such inlets are provided at spaced locations around the circumference of the annular means .
  • one or more inlets are provided at spaced locations along the length of the annular means.
  • two sets of radial inlets are provided, the sets being spatially separated along the length of the annular means .
  • one end of the inlets communicates with a subsidiary annulus located externally of said annular means.
  • each set communicates with a corresponding subsidiary annulus.
  • the inlets are adapted to supply fluid, particularly a gas such as compressed air or an inert gas such as argon or nitrogen or a mixture of these, from such subsidiary annuli to the gap.
  • a gas such as compressed air or an inert gas such as argon or nitrogen or a mixture of these
  • one set of inlets typically located towards the exterior of the furnace in use, supplies compressed air to the gap and another set, typically located towards the interior of the furnace in use, supplies nitrogen to the gap.
  • means is provided for supplying compressed air and/or inert gas such as nitrogen or argon respectively to the first and second subsidiary annuli associated with the first and second sets of inlets.
  • One or more of the inlets may be adapted to supply compressed air, argon, nitrogen or any inert gas or any mixture of these.
  • compressed air argon
  • nitrogen any inert gas or any mixture of these.
  • the choice of gas depends on the installation with which the unit is to be used.
  • Use of compressed air tends to be the cheapest option, however a nitrogen shroud may be used for example if the installation or system requires the elimination of compressed air e.g. due to risk of explosion.
  • the invention includes the combination of any features described with respect to each aspect of the invention.
  • the fluid circulation means and the means for creating a positive pressure are physically isolated so that there is no .communication between the circulating fluid or liquid and the pressure fluid or gas.
  • the invention includes apparatus for mounting on any installation and having the features of the first and second aspects.
  • the invention includes an electric arc furnace comprising apparatus according to the first and/or second aspects of the invention.
  • the apparatus may be provided with a refractory lining or an external refractory housing may surround the apparatus .
  • Figure 3 is a part cross-sectional view through an alternative annulus constructed from box section tubing.
  • the economiser of the invention comprises an upper and lower annulus 10, 12.
  • the internal structure of each annulus comprises a spiral pathway.
  • each annulus has a top plate 14, a bottom plate 16, an external side wall 18 and an internal spiral wall 20.
  • An inlet 22 connects with the lower annulus 12 and an outlet 24 connects with the upper annulus 10.
  • the upper and lower annuli are connected by an intermediate annulus 26.
  • a fluid typically water, is pumped in through the inlet 22 circulates through the spiral pathway of the lower annulus 12, passes up through the intermediate annulus 26, circulates through the spiral pathway of the upper annulus 10 and exits through the outlet 24.
  • the upper and lower annuli 10, 12 may alternatively comprise a series of concentric box sections each having a square or rectangular cross - section.
  • each box section 50 is formed from two angles 52, 54 welded together at joints 56, 58. It will be seen that the joints 56, 58 are hidden and thereby protected by the outer legs of the angles 60, 62 respectively.
  • Successive box sections are welded together at weld joints 64 to form a stable annular unit.
  • Apertures are provided between adjacent box sections to allow fluid flow between the sections and through the annulus. Typically fluid flow will enter the annulus through an inlet 66 located adjacent the peripheral edge thereof, flow around the first concentric 68 and pass through an aperture into the next adjacent concentric section 70 and so on until the fluid exits the inner concentric section via outlets 72 located therein.
  • the economiser is located on a furnace roof centre and may be supported by the roof via flange 28 extending around the periphery of the top plate of the upper annulus. Electrodes 30 mounted in a suitable holder 32 are located through the aperture 34 formed by the annuli.
  • the upper annulus 10 has a smaller aperture diameter than the intermediate and lower annuli 26, 12 so that an annular gap 36 is formed between the electrode holder 32 and the latter annuli. This gap is supplied at its upper end with compressed air and at its lower end with nitrogen via radial inlets 38 and 40 respectively.
  • Compressed air is supplied via an appropriate inlet to a first auxiliary annulus 42 which is located around the exterior of the intermediate annulus 26 and adjacent the upper end thereof.
  • a plurality of radial inlets 38 extend from the first auxiliary annulus, through the intermediate annulus and open into the gap 36.
  • Nitrogen is supplied via an appropriate inlet to a second auxiliary annulus 44 located around the exterior of the intermediate annulus 26 and adjacent the lower end thereof.
  • a plurality of radial inlets 40 extend from the second auxiliary annulus, through the intermediate annulus and open into the gap 36.
  • the compressed air and nitrogen supplied dissipate to atmosphere.
  • the supply of compressed air and nitrogen using the economiser of the invention creates a positive pressure in the gap 36 which prevents gases from the furnace going up into the annular gap.
  • the unit described combines a cooling system using the upper, lower and intermediate annuli to counteract the effects of the heat of the furnace and a corrosion inhibiting system using the auxiliary annuli to create positive pressure to counteract the corrosive effect of accelerated gases from the furnace.
  • the economiser creates a positive pressure on the exterior of the furnace and thereby inhibits the acceleration of gases from the furnace up around the unit .
  • the cooling system effectively extends the lifespan of the economiser compared to conventional economisers by dissipation of the heat load on the unit .
  • Suitable refractories 46 may be located below the economiser to further improve heat and corrosion resistance .
  • the economiser may be made from mild steel or stainless steel, typically of a grade to meet industrial standards .
  • water and gases are supplied as described above.
  • the volume of water used is dependent on the size of the unit which is dictated by the size of the electrodes. In general, sufficient water will be used to eliminate the possibility of nucleate boiling whereby salts in the water deposit on the unit.
  • the gap between the unit and electrodes prevents arcing. The size of the gap typically depends on the furnace and this may determine the gas flow/volume required.
  • the economiser of the invention is designed to operate with similar amounts of gas flow/volume to that of a conventional unit so that it can replace a conventional unit.

Landscapes

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

Abstract

L'invention concerne un dispositif à monter dans ou sur un four, comprenant des éléments de circulation de fluide définissant une voie de circulation du fluide, la première et la deuxième parties de la voie étant situées, en service, vers l'extérieur et l'intérieur du four respectivement.
PCT/GB1998/001003 1997-04-22 1998-04-22 Economiseur pour four electrique a arc Ceased WO1998048229A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU73418/98A AU7341898A (en) 1997-04-22 1998-04-22 Economiser for electric arc furnace

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9708142.6 1997-04-22
GB9708142A GB2324595B (en) 1997-04-22 1997-04-22 Economiser for electric arc furnace

Publications (1)

Publication Number Publication Date
WO1998048229A1 true WO1998048229A1 (fr) 1998-10-29

Family

ID=10811172

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/001003 Ceased WO1998048229A1 (fr) 1997-04-22 1998-04-22 Economiseur pour four electrique a arc

Country Status (3)

Country Link
AU (1) AU7341898A (fr)
GB (1) GB2324595B (fr)
WO (1) WO1998048229A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8960679B2 (en) 2009-08-04 2015-02-24 Outotec Oyj Sealing device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697660A (en) * 1970-03-16 1972-10-10 Jury Fedorovich Frolov Device for sealing gap between electrode and lining of electric arc furnace
US3709506A (en) * 1970-11-12 1973-01-09 Quebec Iron & Titanium Corp Furnace electrode seal
GB2074829A (en) * 1980-04-22 1981-11-04 Qit Fer Titane Inc Furnace electrode seal assembly
GB2114408A (en) * 1981-11-20 1983-08-17 Coated Electrodes Ltd Apparatus for sealing electrodes in electric arc furnaces
EP0293861A2 (fr) * 1987-06-03 1988-12-07 Monsanto Company Assemblage d'un joint d'étanchéité pour électrode

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4107449A (en) * 1976-09-20 1978-08-15 Oleg Mikhailovich Sosonkin Water-cooled roof of electric-arc furnace
LU84104A1 (fr) * 1982-04-22 1984-03-02 Arbed Systeme d'etoupage pour electrodes
CA1199358A (fr) * 1982-06-04 1986-01-14 Robert W. Montgomery Electrodes pour four electrique a arc
DE3400186C2 (de) * 1984-01-02 1987-01-08 Mannesmann AG, 4000 Düsseldorf Durchführung für Elektroden in einem Ofendeckel eines Elektrolichtbogen- oder Reduktionsofens
FR2577311B1 (fr) * 1985-02-11 1987-03-06 Siderurgie Fse Inst Rech Dispositif de connexion electrique destine a etre place en paroi d'un four metallurgique a courant continu.
GB9018441D0 (en) * 1990-08-22 1990-10-03 Tetronics Res & Dev Co Ltd Treatment of oxide containing dusts
DE4236158C1 (de) * 1992-10-20 1994-03-17 Mannesmann Ag Elektrodentragarm für Lichtbogenöfen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697660A (en) * 1970-03-16 1972-10-10 Jury Fedorovich Frolov Device for sealing gap between electrode and lining of electric arc furnace
US3709506A (en) * 1970-11-12 1973-01-09 Quebec Iron & Titanium Corp Furnace electrode seal
GB2074829A (en) * 1980-04-22 1981-11-04 Qit Fer Titane Inc Furnace electrode seal assembly
GB2114408A (en) * 1981-11-20 1983-08-17 Coated Electrodes Ltd Apparatus for sealing electrodes in electric arc furnaces
EP0293861A2 (fr) * 1987-06-03 1988-12-07 Monsanto Company Assemblage d'un joint d'étanchéité pour électrode

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8960679B2 (en) 2009-08-04 2015-02-24 Outotec Oyj Sealing device

Also Published As

Publication number Publication date
GB2324595B (en) 1999-03-10
AU7341898A (en) 1998-11-13
GB2324595A (en) 1998-10-28
GB9708142D0 (en) 1997-06-11

Similar Documents

Publication Publication Date Title
CA3016943C (fr) Paroi de refroidissement de four modulaire
CN1965093A (zh) 在钢铁制造中使用的热交换器系统
US12163738B2 (en) Split roof for a metallurgical furnace
TWI841570B (zh) 燃燒器面板、包括燃燒器面板的冶金爐和用於將燃燒器面板緊固至冶金爐的方法
TR201808972T4 (tr) Metalurjik fırınlar için bir akışkan ile soğutulan bir panel, bu tür bir paneli içeren metalurjik fırınlar için bir soğutma sistemi ve bunları birleştiren metalurjik fırın.
US4306726A (en) Furnace electrode seal assembly
GB2280501A (en) Burner mounting device
US6415724B1 (en) Water-jacketed, high-temperature, stretcher-accessible door for a boiler
US4304396A (en) Cooling box for steel-making arc furnace
EP1801241A1 (fr) Dispositif de refroidissement d'une installation de chargement d'un four a cuve avec goulotte tournante
WO1998048229A1 (fr) Economiseur pour four electrique a arc
RU2281974C2 (ru) Охлаждающий элемент для охлаждения металлургической печи
RU2398166C2 (ru) Электродуговая печь
US20240318914A1 (en) Stand alone copper burner panel for a metallurgical furnace
US4377289A (en) Furnace electrode seal assembly
JPH0141917B2 (fr)
WO1984000980A1 (fr) Tuyere de soufflage par le fond au travers du metal
JP2020524250A (ja) カセット型のドロップアウトボックス、燃焼室、ダクトおよび電気アーク炉の上部シェルシステム
RU2664100C1 (ru) Погружная труба для циклонного сепаратора
EA036881B1 (ru) Холодильная плита для металлургической печи
WO2012164142A1 (fr) Agencement de brûleur et ensemble brûleur
EP0591379B1 (fr) Agencement de pompe submersible
CN111373218A (zh) 耐磨、单个穿透处的冷却壁冷却器
US20010037877A1 (en) Device and method for cooling fume intakes
GB2059556A (en) Cooling Box for Steel-making Arc Furnace

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CU CZ DE DK EE ES FI GB GE GH HU IL IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT UA UG US UZ VN YU ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 1998545262

Format of ref document f/p: F

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA