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WO2016191842A1 - Panneau double réfrigéré pour fours électriques à arc - Google Patents

Panneau double réfrigéré pour fours électriques à arc Download PDF

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Publication number
WO2016191842A1
WO2016191842A1 PCT/BR2016/050122 BR2016050122W WO2016191842A1 WO 2016191842 A1 WO2016191842 A1 WO 2016191842A1 BR 2016050122 W BR2016050122 W BR 2016050122W WO 2016191842 A1 WO2016191842 A1 WO 2016191842A1
Authority
WO
WIPO (PCT)
Prior art keywords
panel according
face
panel
safety
working face
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/BR2016/050122
Other languages
English (en)
Portuguese (pt)
Inventor
LIMA DE SOUZA Marcelo GUERRA
SILVEIRA Fabrício GARAJAU
SILVA Marcelo DUARTE
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.)
LUMAR METALS Ltda
Original Assignee
LUMAR METALS Ltda
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 LUMAR METALS Ltda filed Critical LUMAR METALS Ltda
Publication of WO2016191842A1 publication Critical patent/WO2016191842A1/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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • 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
    • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Electric arc furnaces ; Tank furnaces heated electrically, with or without any other source of heat
    • 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
    • F27B3/24—Cooling arrangements
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements

Definitions

  • the present invention relates to a refrigerated double panel for use in an electric arc furnace, more specifically to a double-sided panel, one of which is operational and one of safety, having both sides of water circuits. Independent and also independent functions, with the operating face designed to provide correct heat extraction and the safety face ensuring the process is carried out by observing the operator and operational safety aspects of the process.
  • the dual refrigerated panel features low weight and low value-added material combinations and is therefore a low cost panel with ergonomic advantages for maintenance operations, notably assembly and disassembly, and operational characteristics aimed at optimizing the furnace energy balance combined with operator safety during electric furnace operation.
  • Electric steel mills and their electric arc furnaces - FEA are recycling units that use ferrous scrap as the main raw material for steelmaking, characterizing the scrap-based route.
  • the Electric Arc Furnace - FEA had its first commercial-scale plant installed in the United States of America in 1907. Initially electric arc ovens emerged as small production ovens ranging from 3 and 10 tons its capacity. With the development of technology, the capacity of these ovens quickly reached 100 tons. In the period of World War II Electric Arc Furnaces - FEA were widely used in steel production, but it was not until the sixties that this type of technology began to gain prominence in world steel production.
  • the refrigerated panels were installed on the side walls of the Arc Electric Furnaces - FEA replacing the refractory linings that remain today in the lower parts of Arc Electric Furnaces - FEA, in the region of contact with the liquid metal, in order to reduce downtime for repair ovens.
  • the excellent results achieved led to the expansion of refractory lining replacement throughout the wall and even in the vaulted region, outer region around the crumb.
  • the first refrigerated panels were made of special steel plate with an internal baffle system for directing water flow. These refrigerated panels are also known as "box type" panels.
  • the modern refrigerated panels can be made of steel or copper pipes, allowing the use of tubular panels and a reduction in the volume of circulating cooling water, which cooling water has a temperature rise between 10 and 35 ° C. and its flow rate is regulated to maintain control of the outlet temperature.
  • the use of refrigerated panels has a number of advantages, such as: a) increased productivity; b) eliminating the need to reduce power during the flat bath period; c) 50% reduction in the repair time spent with refractory material; d) reduction of the time for the assembly of a new furnace, due to the reduction of the area of use of refractories; e) refractory economy, being an important economic advantage; and (f) the possibility of increasing the specific power level depending on the oven by using forced cooling of the be able to withstand higher arc thermal impacts when compared to ovens without refrigerated panels.
  • the refrigerated panels are installed at a distance of 300 to 400 mm above the level of the metallic bath, but variations may occur depending on the type of panel material, oven power etc.
  • refrigerated panels are also used to allow the assembly of process auxiliary equipment such as: refrigerated copper blocks, injectors and / or oxygen burners, carbon and lime fin injectors; sample makers etc.
  • vaulted refrigerated panels has a number of advantages, such as: a) weight 30% less than that of refracted vaults; b) possibility of saving between 60 and 90% of refractory use; c) extended crumb life which can be easily changed; d) operation with lower temperatures around 60 ° C; and e) considerable increase in the service life of the vault.
  • cold spots the regions of electric furnaces whose performance of the electrodes for melting the metal charge is inefficient.
  • systems capable of providing auxiliary energy to the process, such as oxy-fuel burners. and oxygen injectors.
  • the installation of burners, injectors and other process auxiliary equipment in the oven's cold spots causes a heating of these regions and a more homogeneous melting of the furnace metal charge.
  • burner power, injector flow rate, mounting angle etc. refrigerated panels installed in these cold spots will also require special care and follow-up.
  • cooling circuits made with half rods are used, which promote a larger contact area and a higher water velocity, thus increasing the heat extraction.
  • the flat geometry reduces the number of bends in the circuit, reducing the final weight.
  • the possibility of applying refractory or ceramic coatings allows the panel a lower heat extraction, which can represent energy gains for the oven and a longer life to the panel.
  • Another object of the present invention is related to the development of a panel whose geometry and the materials used can promote the increased operational safety of the electric furnace and especially of the operators when compared with the state of the art.
  • Dual chamber geometry increases operational safety because if the first circuit is damaged, the second circuit works independently, acting as a protective shield for operators.
  • the second circuit allows a programmed shutdown of the electric ovens avoiding emergency stops that increase the risk of accidents. In this way, it is possible to increase the resistance to failures caused by electric arc and flame rebounds, guaranteeing the operators safety due to the double chamber with independent cooling circuits.
  • the working face consists of half rods (or half tubes) comprising bent flange profiles of varying dimensions according to panel measurements forming an independent cooling circuit which is welded to the intermediate plate and may cover the entire surface of the intermediate plate or only part of this surface, always forming a well-defined circuit with separation between the cooling water inlet and outlet, internal baffles and intermediate plate.
  • a layer of thermal insulating coating can be applied, as well as having the option of profiles in steel or copper.
  • the intermediate plate has the primary function of separating circuits to ensure effective protection for operators as well as the basis for structural support of the equipment.
  • the safety face consists of bent profiles of varying dimensions according to the panel dimensions, made of steel, which are fixed by welding to the intermediate plate, which must cover the entire length of it, forming a circuit of independent cooling, promoting safety and survival of the equipment in case of sacrifice of the work circuit, having intermediate plate, internal baffles and external plate.
  • the dual refrigerated panel object of the present invention (107) consists of bent profiles of copper or steel plate and plate and / or inner coated steel (108), intermediate position steel plates (109) and plate external (110).
  • the intermediate position steel plate (109) separates the cooling circuit from the inside or working face (204) from the cooling circuit from the outside or safety face (205).
  • the dual refrigerated panel (107) with the functions split between work face (204) and safety face (205) allows the use of thin plates on the intermediate plate (109) and the outer plate (110), reducing weight when compared to traditional refrigerated panel, reducing the final cost of production.
  • the cooling circuit (206) is easily mounted on the intermediate plate (109) on the working face (204) and safety face (205), consisting of half rods (207).
  • the working face (204) is coated with a non-conductive thermal insulating layer (1 1 1) and can be applied to hot spots (202) of the electric arc furnace.
  • the working face (204) with copper half rods (108) may be applied in hot spots or with steel half rods (108) may be applied in regions with lower thermal stress.
  • the ability of the work face combinations (204) allows the optimization of the energy balance of the electric arc furnace with significant impacts on the consumption of electric energy, combustible gases and oxidizing gases, as well as auxiliary equipment, notably water recirculation pumps. cooling systems and cooling circuit cooling systems.
  • the intermediate plate (109) Arranged between the work face (204) and the safety face (205), the intermediate plate (109) functions as the first operator protection barrier, allowing operation to be halted without risk of damage to life.
  • Figure 1 shows a side cross-sectional view and Figures 2 and 3 show a three-dimensional view of the refrigerated double panel (107) object of the present invention, introducing the concept of faces, the working face (204) being shown. , the side of the panel that is in contact with the inner surface of the FEA.
  • the working face 204 is a cooling circuit formed of steel or copper half rods 108.
  • the circuit made on the work face 108 is fixed to the intermediate plate 109 by welding, forming channels for passage of the coolant, which in this case is water.
  • the intermediate plate (109) has the function of dividing the circuits, but also has the important function of being the first protective barrier of the safety face (205).
  • the intermediate plate (109) may consist of two thin plates for effective isolation of the work face (204) and safety face (205) circuits.
  • thermal insulating coatings (1 1 1) may be applied to cold spot regions. (203) which have a high incidence of short circuits and flame rebounds.
  • steel or copper may be used in the half rods to increase heat extraction and prevent premature damage to the panel.
  • the thermal insulating coating (1 1 1) is a thin layer of the order of millimeter to centimeters. A vast composition of materials for thermal insulating coating (1 1 1), being dependent on the functions to be performed during the activity of the FEA and its positioning. Thermal insulating coating (1 1 1) may have impact resistance properties, electrical insulators, combinations of these and other properties.
  • the intermediate plate (109) is made of high resilience material and reduced thickness contributing to the weight reduction of the double refrigerated panel (107). The intermediate plate (109) also has the function of separating the cooling circuits between the working face (204) and the safety face (205).
  • the safety face (205) consists of lightweight and lightweight steel plates. Inside is also the assembly of a circuit made in half rods, properly positioned and welded on the intermediate plate (109) leading the passage of cooling water (306).
  • the low material thickness as well as the low resilience give the system, in the event of an explosion inside the FEA, the ability of the double refrigerated panel (107) to deform without, however, rupturing the safety face (205). , acting as a shield for operators, thus contributing to operational safety.
  • the lower weight of the dual refrigerated panel (107) as compared to the state-of-the-art panels allows maintenance activities to be performed with reduced ergonomic stresses for both removal and repositioning.
  • the constructive shape of the dual refrigerated panel (107) coupled with the choice of low thickness materials and insulating coatings (1 1 1) allows the panel of the present invention to be marketed at a very competitive and low cost price. Maintenance and safety and operational guarantees superior to current refrigerated panels.
  • the dual refrigerated panel (107) can be applied to other FEA refrigerated segments such as dome and exhaust ducts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Abstract

L'invention concerne un panneau à deux faces, l'une fonctionnelle et l'autre de sécurité, à utiliser dans un four électrique à arc, et notamment un panneau double dont les deux faces présentent des circuits d'eau indépendants et des fonctions également indépendantes, la face fonctionnelle étant mise au point de manière à offrir une extraction de chaleur satisfaisante et la face de sécurité assurant la réalisation du procédé dans des conditions sûres pour les opérateurs et pour la mise en oeuvre du procédé. Ledit panneau double réfrigéré présente des caractéristiques de faible poids et des combinaisons de matériaux à faible valeur ajoutée, et constitue donc un panneau de faible coût présentant des avantages ergonomiques pour les opérations de manutention ainsi que des caractéristiques fonctionnelles visant à optimiser l'équilibre énergétique du four tout en assurant la sécurité des opérateurs pendant le fonctionnement du four électrique.
PCT/BR2016/050122 2015-06-05 2016-06-02 Panneau double réfrigéré pour fours électriques à arc Ceased WO2016191842A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BR102015013157-7A BR102015013157B1 (pt) 2015-06-05 2015-06-05 Painel duplo refrigerado para fornos elétricos a arco
BRBR1020150131577 2015-06-05

Publications (1)

Publication Number Publication Date
WO2016191842A1 true WO2016191842A1 (fr) 2016-12-08

Family

ID=57439725

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BR2016/050122 Ceased WO2016191842A1 (fr) 2015-06-05 2016-06-02 Panneau double réfrigéré pour fours électriques à arc

Country Status (2)

Country Link
BR (1) BR102015013157B1 (fr)
WO (1) WO2016191842A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1238375A (fr) * 1959-07-01 1960-08-12 Alsthom Cgee Nouvelles parois avec circulation interne de fluide
SE427776B (sv) * 1980-01-18 1983-05-02 Mikael Brunner Vattenkyld panel for ljusbagsugn
JPH09119776A (ja) * 1995-10-24 1997-05-06 Nippon Steel Corp アーク炉の水冷炉蓋
WO1999013281A1 (fr) * 1997-09-10 1999-03-18 Danieli & C. Officine Meccaniche S.P.A. Dispositif de refroidissement a panneaux pour four a arc electrique
WO2012017312A1 (fr) * 2010-08-06 2012-02-09 Tenova S.P.A. Panneau refroidi avec un fluide pour des fours métallurgiques, système de refroidissement pour des fours métallurgiques comprenant un tel panneau et four métallurgique les incorporant

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1238375A (fr) * 1959-07-01 1960-08-12 Alsthom Cgee Nouvelles parois avec circulation interne de fluide
SE427776B (sv) * 1980-01-18 1983-05-02 Mikael Brunner Vattenkyld panel for ljusbagsugn
JPH09119776A (ja) * 1995-10-24 1997-05-06 Nippon Steel Corp アーク炉の水冷炉蓋
WO1999013281A1 (fr) * 1997-09-10 1999-03-18 Danieli & C. Officine Meccaniche S.P.A. Dispositif de refroidissement a panneaux pour four a arc electrique
WO2012017312A1 (fr) * 2010-08-06 2012-02-09 Tenova S.P.A. Panneau refroidi avec un fluide pour des fours métallurgiques, système de refroidissement pour des fours métallurgiques comprenant un tel panneau et four métallurgique les incorporant

Also Published As

Publication number Publication date
BR102015013157B1 (pt) 2021-12-21
BR102015013157A2 (pt) 2016-12-06

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