US3375315A - Arc furnace roof - Google Patents

Arc furnace roof Download PDF

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Publication number
US3375315A
US3375315A US411739A US41173964A US3375315A US 3375315 A US3375315 A US 3375315A US 411739 A US411739 A US 411739A US 41173964 A US41173964 A US 41173964A US 3375315 A US3375315 A US 3375315A
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US
United States
Prior art keywords
roof
bricks
beams
furnace
suspended
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.)
Expired - Lifetime
Application number
US411739A
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English (en)
Inventor
Gray William
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.)
John G Stein and Co Ltd
Original Assignee
John G Stein and Co 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 John G Stein and Co Ltd filed Critical John G Stein and Co Ltd
Application granted granted Critical
Publication of US3375315A publication Critical patent/US3375315A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/06—Crowns or roofs for combustion chambers
    • 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
    • F27B3/12—Working chambers or casings; Supports therefor
    • 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
    • F27D1/02—Crowns; Roofs
    • F27D1/021—Suspended roofs

Definitions

  • Electric arc furnaces have been used for melting steel for very many years, but recently there has been a large increase in the size of individual furnaces.
  • the normal maximum size of a furnace of this character was ten or fifteen ton capacity, but now furnaces of one hundred ton and even one hundred and twenty ton capacity are coming into operation.
  • the smaller furnaces previously used had roofs of sprung construction, but for larger furnaces it appears desirable to suspend the roofs. This type of construction not only gives better support for the roof, but also helps to prevent so called pinchspalling of the bricks caused by excessive thrust of the hot face of the brick.
  • a furnace roof comprising a plurality of suspended bricks is characterised by the fact that a part only of the roof is constituted by the said suspended bricks, which are arranged to form open frames of small size compared to the roof as a whole, and the frames are filled by materials which are supported by the said suspended bricks.
  • This construction not only facilitates the construction of the openings for the electrodes and reduces the problem of in sulating the hangers, which are peculiar to electric furnaces, but also offers numerous other advantages, as will be pointed out below.
  • furnace roof in accordance with the present invention is described below, by way of example only, with reference to the accompanying drawings, in which:
  • FIGURE 1 is a diagrammatic plan view of the roof
  • FIGURES 2 and 3 are diagrammatic views on the lines II--II and TIL-III respectively, of FIGURE 1;
  • FIGURE 4 is a plan view, on a larger scale, of one frame of the roof.
  • FIGURES 5 and 6 are views on the lines V-V and VI-VI respectively, of FIGURE 5.
  • the space between adjacent main beams M (and between the outermost main beams and the curb of the roof) are subdivided by cross beams C disposed at right angles to the main beams M and also formed by suspended bricks.
  • the main and cross beams are so arranged that each of the three electrodes 9 will be disposed approximately centrally in one of the rectangular spaces left between the beams, these spaces or open frames measuring typically some three feet by two and a half feet.
  • the suspended bricks are so shaped that those faces which border the open frames slope inwardly and downwardly, thus allowing the frames to be filled securely with un- 3,375,315 Patented Mar. 26, 1968 suspended brickwork, or with rammed or plastic material.
  • the curb 1-0 of the roof is faced where necessary with a packing 11 rammed or plastic material to provide an inwardly and downwardly sloping surface which will form an abutment for the fillings of the frames at the periphery of the roof.
  • the frames through which the electrodes 9 pass are most conveniently filled by a patch 13 of rammed or plastic material and some or all of the remaining boxes may be filled in a similar way. However, it will generally be more convenient to fill them with unsuspended brickwork U, using bricks which taper downwardly in cross section. Such a frame is illustrated in FIGURES 4, 5 and 6.
  • a roof constructed in the manner described above offers numerous advantages over roofs constructed in accordance with previously known methods. Repair of the roof is much simpler than for a sprung roof, where there is a danger that the whole roof will collapse when a few bricks have worn thin, or fall into the furnace.
  • the new system allows a portion of the roof to be hung with new suspension bricks, which then form a bridge allowing further bricks to be placed to fill the openings. This can be done even when the furnaces are still hot.
  • Constructions in accordance with the invention may be used with bricks made of any material, including silica, high alumina and basic bricks. Bricks of these two latter types are being used to an increasing extent in order to contain the extremely high temperatures required by modern steel making practice, but they are very much heavier than the silica bricks which were previously commonly used.
  • the improved support afforded by constructions in accordance with the present invention renders those constructions particularly suitable for use when the heavier types of brick are employed.
  • the invention is not limited in its application to the roofs of electric arc furnaces, but may be applied to other types of furnace, such as soaking pits, reheating furnaces and even open hearth furnaces.
  • a furnace roof comprising a plurality of spaced parallel main beams extending across the roof, a plurality of cross beams transverse to said main beams, said main beams and said cross beams defining a plurality of rectangular open frames'of'sr'nall size compared to the size ofthe roof as awhole, each of said bearnsbeing comi posed of suspended bricks, and filler materials which fill said open frames, said filler materials being supported by said beams;
  • a furnace. roofaccording to claim 1, whereineach of; said beams comprises at least two rows of suspended bricks arranged sidez-by-side, said bricks having outer faces which slope downwardly and outwardlyv away from the centre line-of said beam so that said beam has a cross section of: approximately trapezoidal form.
  • each of said main beams comprises four rows of suspended bricks arranged side-by-side, two inner rows and two outer rows, saidbricks ofeachof said inner rows having parallel vertical side faces extending longitudinally of said beams,.said bricks of said outer rows having vertical inner faces adjacent said inner rows and having outer faces which slope downwardly and outwardly away from the centre line of the beam, so that said beam increases in width downwardly.
  • a furnace roof according to claim 1, wherein said filler materials in at least some of said frames is constituted by unsuspended' brickwork, including bricks of downwardly tapering cross section.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
US411739A 1963-11-18 1964-11-17 Arc furnace roof Expired - Lifetime US3375315A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB45410/63A GB1022678A (en) 1963-11-18 1963-11-18 Improvements relating to furnace roofs

Publications (1)

Publication Number Publication Date
US3375315A true US3375315A (en) 1968-03-26

Family

ID=10437108

Family Applications (1)

Application Number Title Priority Date Filing Date
US411739A Expired - Lifetime US3375315A (en) 1963-11-18 1964-11-17 Arc furnace roof

Country Status (5)

Country Link
US (1) US3375315A (da)
DK (1) DK106451C (da)
ES (1) ES305668A1 (da)
GB (1) GB1022678A (da)
NL (1) NL6413109A (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4597341A (en) * 1985-05-22 1986-07-01 Suey Paul V Soaking pit cover

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2021424A (en) * 1935-01-31 1935-11-19 American Manganese Steel Co Electrode furnace roof
US2029492A (en) * 1933-05-31 1936-02-04 American Smelting Refining Metallurgical furnace of the suspended arch type
US2713787A (en) * 1949-10-31 1955-07-26 Detrick M H Co Refractory wall section and method of making the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2029492A (en) * 1933-05-31 1936-02-04 American Smelting Refining Metallurgical furnace of the suspended arch type
US2021424A (en) * 1935-01-31 1935-11-19 American Manganese Steel Co Electrode furnace roof
US2713787A (en) * 1949-10-31 1955-07-26 Detrick M H Co Refractory wall section and method of making the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4597341A (en) * 1985-05-22 1986-07-01 Suey Paul V Soaking pit cover

Also Published As

Publication number Publication date
NL6413109A (da) 1965-05-19
ES305668A1 (es) 1965-03-16
DK106451C (da) 1967-02-06
GB1022678A (en) 1966-03-16

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