US3804392A - Blast furnace top structure - Google Patents

Blast furnace top structure Download PDF

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Publication number
US3804392A
US3804392A US00209556A US20955671A US3804392A US 3804392 A US3804392 A US 3804392A US 00209556 A US00209556 A US 00209556A US 20955671 A US20955671 A US 20955671A US 3804392 A US3804392 A US 3804392A
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US
United States
Prior art keywords
stage
stages
furnace top
floor
large bell
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
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US00209556A
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English (en)
Inventor
N Kishikawa
M Kosugi
Y Iwamaru
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.)
Nippon Steel Corp
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Nippon Steel Corp
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Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
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Publication of US3804392A publication Critical patent/US3804392A/en
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements

Definitions

  • ABSTRACT An improvement in a blast furnace top structure designed for facilitating the replacement of a part of said structure, which may be, for instance, divided into three stages, stages I, II and III.
  • Floors support the stages I and II, respectively, said floors being elongated in the direction different from the crane running direction.
  • Guide rails laid on the respective floors support wheels fitted on the stages I and II, respectively, so that the stages I and II can be moved aside on said rails, whereby the stage III can be easily replaced without need of moving the stages I and II down onto the ground.
  • the present invention relates to an improvement in a blast furnace top structure, more particularly an improvement designed to reduce the time required for the 5 replacement of the large bell and the large bell cup of the furnace top structure without the necessity of taking down other parts of the furnace top structure to the ground, and a method for replacing the large bell and large bell cup by means of said improvement.
  • FIG. 1 is a schematic vertically sectioned view of a conventional blast furnace top structure.
  • FIG. 2 is a plan view of the structure of FIG. 1.
  • FIG. 3 is a schematic vertically sectioned view of a blast furnace top structure according to the present invention.
  • I 45 FIG. 4 is a sectional view taken on line A-A in FIG.
  • FIG. 5 is a sectional view taken on line B-B in FIG. 3.
  • FIG. 6 is a sectional view taken on line C--C in FIG. 3.
  • FIG. 7a is an explanatory view showing the steps in the replacement of a large bell cup in the conventional blast furnace top structure.
  • FIG. 7b is an explanatory view showing the steps in the replacement of a large bell cup in the blast furnace top structure according to the present invention.
  • Atriple seal construction which is composed of a large hell I, a large bell cup 2, a small bell 3 and a small bell cup 4 and in addition thereto a sealing valve 5, as shown in FIG. 1.
  • This is to improve the air-tighteness with respect to the furnace top pressure of the blast furnace and to prevent the large bell l and the large bell cup 2, which are most difficult to replace, from being worn by a dust-containing high pressure gas current within the furnace.
  • the furnace top structure is made more complicated by the above construction, so that the replacement of the large bell 1 and large bell cup 2 has become very difficult.
  • the replacement work is carried out by first dividing the furnace top structure into several stages: for instance, in the structure as shown in FIGS. 1 and 2 the furnace top structure is divided into three stages, that is, stages I, II and III.
  • the stage I is composed of a rotary chute and a hopper
  • the stage II is composed of a small bell
  • the stage III is composed of a large bell and a large bell cup.
  • stages I and II must first be removed temporarily.
  • stages I and II are removed and brought down onto the ground or onto an operating floor around the furnace by means of a crane 10 which runs on the crane girder 9.
  • stage III is removed and brought down onto a waiting place 13 on the ground.
  • a newly made large bell and large bell cup are hoisted up and placed in the original position of the furnace top in a manner opposite to the above-mentioned manner, and thereafter the stages I and II are hoisted up from the ground or the casting floor 11 to the furnace top, and then the large bell rod 7 and the small bell rod 8 are connected to the large bell and the small bell respectively to complete the replacement operation.
  • the conventional manner of replacing the large bell and large bell cup has various disadvantages, Because not only the large bell and large bell cup, which are to be replaced, but also the stages I and II, which are working in good order and need not to be replaced, must be removed and brought down onto the ground or the operating floor by means of the furnace top crane 10, too much time is required for the replacing work and moreover an overhead crane having a large capacity and a large storage area, to which the stages I and II must be moved and in which they must wait for the completion of the replacement of the stage I, must be provided on the operating floor. Further, the replacement operation is dangerous in its nature on account of the steps which must be carried out in a high place. Therefore, the present invention seeks to eliminate these disadvantages and to provide an improvement in a furnace top structure, by means of which the replacement of the large bell and large bell cup can be carried out easily and within a short time.
  • the present invention provides an improved a blast furnace top structure which is divided into, for instance, three stages, stages I, II and III, said stage I being composed of a chute and hopper, the stage II being composed of a small bell, a small bell cup and a 5 hopper and the stage III being composed of alarge bell and a large bell cup.
  • Supporting floors are provided for supporting the stage I and stage II, respectively, said supporting floors being elongated in a direction different from the direction in which the crane runs and guide rails are provided on the respective supporting floors.
  • Wheels are mounted on the hopper of stage I on a bracket and wheels are mounted on an upper mantle of the stage II on a bracket, and the wheels run on said rails so that the stages I and II can be moved aside on the respective guide rails to provide sufficient space to permit replacement of stage III.
  • the description is of the case in which the furnace top structure is divided into three stages as described above.
  • the present invention is, however, not limited to this case.
  • a different furnace top structure can be divided otherwise.
  • the structure may be divided into two stages.
  • the stage I is composed of a chute, a hopper, a small bell and small bell cup and the stage II is composed of a large bell and a large bell cup.
  • the structure may be divided into three stages I, II and III, but the stage I is composed of two hoppers and the stage II is composed of a small bell, a small bell cup, a hopper and a chute.
  • the present invention may also be, of course, applied also to these cases without any difficulty.
  • the stage I is composed of a chute I4 and a hopper l5.
  • Axles I8 are mounted on the outside of the hopper 15 on brackets and wheels 19 are rotatably mounted on said axles 18.
  • the rails 20, on which the wheels 19 run, are laid on the floor 16 supporting the stage I, said floor being elongated by 3-5 meters beyond the original floor in a direction at right angles to (in this embodiment) or in the opposite direction to that in which a crane girder 9 extends. Therefore, the stage is so arranged that it is mounted on the rails 20 through the axles l8 and the wheels 19 and can be moved horizontally n the rails to a waiting place provided on the elongated floor 16, where the stage I waits until the replacement of the stage III is finished. Further, a fixing device can be provided between the stage and the floor 16 so that during the operation of the blast furnace the stage can be fixed to the floor.
  • a plurality of axles 22, preferably four, are mounted on the outside of the upper mantle 21 as in the case of stage I and wheels 23 are rotatably mounted on the axles 22, but such that they are freely mountable on and removable from the axles.
  • the guide rails 24 are laid on the supporting floor 17 for supporting the stage II, said floor being elongated by 8 to meters extending beyond the original floor 17 in a direction different from the direction in which the crane for hoisting and lowering the stage III runs.
  • the stage II can be moved on the rails horizontally to a waiting place provided on the extended floor 17.
  • the wheels 23 are removed in order to provide a tight joint between the upper mantle and the large bell.
  • the stages II and III are joined with each other by connecting the upper mantle 21 of the small bell and the large bell cup 2 by bolts or the like.
  • the wheels can be made of a structure provided with a resilient means, instead of removing the wheels for securing the tight joint between the upper mentle and the large bell.
  • the wheels used for moving the stages I and II can be replaced by moving rollers.
  • the stages I and II are horizontally moved aside in a direction at right angles to the direction the girder 9, extends as shown in FIG. 4, on the rails 20 and 24 laid on the elongated supporting floors l6 and 17 respectively to the waiting places provided on the respective floors, where the stages I and II may remain until the replacement work on the stage III is finished.
  • stage III that is, the large bell and large bell cup
  • stage III is lowered down onto the ground or the operating floor 11 by means of the furnace top crane l0.
  • a new or rebuilt stage III is hoisted up from the ground or the operating floor to the original position thereof in the furnace top.
  • the time and labor required for the replacement of the large bell 1 and large bell cup 2 can be greatly reduced, as is shown in FIG. 7b, because the stages I and II are simultaneously moved aside horizontally on the guide rails laid on the supporting floors, without the necessity of lowering them down onto the ground or the operating floor, as was heretofore the case.
  • the equipment cost and space can be greatly reduced, because the capacity of the overhead crane and the waiting area on the operating floor need only be sufficiently large to accommodate stage I.
  • the present invention has a great practical value.
  • a blast furnace top structure including a first stage composed of a large bell and a large bell cup and including at least one further stage composed of a chute and a hopper and a small bell, a small bell cup and a hopper; and a means for replacing said first stage, said means having a top crane running in one direction for hoisting and lowering at least said first stage; at least one floor supporting the said further stage, said floor extending laterally of said furnace top structure in a direction different from the one direction in which said top crane runs, guide rails on said floor, and wheels mounted on said further stage which run on said rails, whereby said further stage can be moved on said rails to enable replacement of the first stage without the necessity of removing and lowering said further stage to the ground and raising and replacing it when the first stage replacement has been completed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Blast Furnaces (AREA)
  • Conveying And Assembling Of Building Elements In Situ (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
US00209556A 1970-12-21 1971-12-20 Blast furnace top structure Expired - Lifetime US3804392A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1970127688U JPS4924567Y1 (de) 1970-12-21 1970-12-21

Publications (1)

Publication Number Publication Date
US3804392A true US3804392A (en) 1974-04-16

Family

ID=14966229

Family Applications (1)

Application Number Title Priority Date Filing Date
US00209556A Expired - Lifetime US3804392A (en) 1970-12-21 1971-12-20 Blast furnace top structure

Country Status (7)

Country Link
US (1) US3804392A (de)
JP (1) JPS4924567Y1 (de)
AU (1) AU463490B2 (de)
BR (1) BR7108471D0 (de)
CA (1) CA939144A (de)
DE (1) DE2163252B2 (de)
GB (1) GB1351830A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4352619A (en) * 1980-08-26 1982-10-05 Kiyotoshi Sakai Blast furnace installations

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4138022A (en) * 1976-10-29 1979-02-06 Nippon Kokan Kabushiki Kaisha Furnace top charging apparatus
LU85899A1 (fr) * 1985-05-14 1986-12-05 Wurth Paul Dispositif de manutention d'une goulotte de distribution d'un four a cuve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4352619A (en) * 1980-08-26 1982-10-05 Kiyotoshi Sakai Blast furnace installations

Also Published As

Publication number Publication date
DE2163252A1 (de) 1972-07-06
BR7108471D0 (pt) 1973-05-29
JPS4924567Y1 (de) 1974-07-02
AU3714671A (en) 1973-06-28
DE2163252B2 (de) 1973-11-15
CA939144A (en) 1974-01-01
AU463490B2 (en) 1975-07-31
GB1351830A (en) 1974-05-01

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