US3554393A - Charging device for a furnace - Google Patents

Charging device for a furnace Download PDF

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Publication number
US3554393A
US3554393A US714668A US3554393DA US3554393A US 3554393 A US3554393 A US 3554393A US 714668 A US714668 A US 714668A US 3554393D A US3554393D A US 3554393DA US 3554393 A US3554393 A US 3554393A
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US
United States
Prior art keywords
hopper
bell
small bell
protective element
furnace
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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US714668A
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English (en)
Inventor
Leon Jean Barballe
Maurice Joseph Hermans
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.)
Centre de Recherches Metallurgiques CRM ASBL
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Nationale De Rech Metallurg Ce
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Application filed by Nationale De Rech Metallurg Ce filed Critical Nationale De Rech Metallurg Ce
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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

  • a blast furnace charging device having a dis tributing hopper vertically movable above a small charging bell and a large charging bell below the small bell, with the hopperresting on a protective element on the outside of the small bell which acts as a mobile base for the hopper, and the device charging the furnace by successive vertical movements of the hopper and small bell, and the large bell.
  • the invention relates to a charging device for a shaft furnace, more particularly for use with a blast furnace operating with or without high top pressure, where it isintended to provide a gastight closure.
  • Shaft furnaces and in particular blast furn'aces are known to be provided at the top with a charging device consisting for example of a skip or conveyor belt dumpingthe materials for charging, i.e. ore, flux and coke into a distributing device intended to ensure maximum homogeneity of each component of .the charge and optimum distribution of the charge in the furnace, while preventing any direct connection between the inside of the furnace and the outside atmosphere.
  • a charging device consisting for example of a skip or conveyor belt dumpingthe materials for charging, i.e. ore, flux and coke into a distributing device intended to ensure maximum homogeneity of each component of .the charge and optimum distribution of the charge in the furnace, while preventing any direct connection between the inside of the furnace and the outside atmosphere.
  • a frequently used distributing device for this operation consists of a hopper open at the top and twobells, the smaller of which, situated at the bottom of the hopper, serves as a hopper A base while the larger, situated below the smaller bell, controls the dumping of the "charge into the furnace.
  • the hopper into which the charge is deposited by the charging device' is rotatably mounted and provided with a control device to rotate it as required.
  • the small bell forming the base of this hopper is rotated by friction when the hopper rotates.
  • the invention consists in a charging device for a shaft furnace comprising a distributing hopper for receiving a furnace charge through charging means such as a receiving hopper, a large bell, a small bell, means suspending said bells with the small bell above the large bell and means defining a chamber between the two bells.
  • the distributing hopper istprovided with a device enabling it to slide along its longitudinal axis and with a rotating device, and the small bell is provided with a protective element acting as a mobile base for the distributing v hopper, the lower part of which hopper rests on said base.
  • This device allows the distributing hopper to rotate in relation to the shaft furnace, quite independently of the two bells.
  • the weight of I the hopper can be compensated by adjustable counterweights Difficulties in eliminating wear. and in dismantling and replacing joints are-additional drawbacks of the conventional charging systems.
  • An object of the present invention is to provide a charging device for a furnace enablingthe above drawbacks to be minimized and enabling the required gastightness between the furnace and the outside atmosphere through the various parts of the chargingdevice to be achieved simply and economically.
  • one advantage of the device is that it can be installed on existing blast so that the small hell can rise easily.
  • the base on which the distributing hopper rests is suspended from an element adapted to move with the small bell, so that by lowering the small bell sufficiently (i.e. more than the sliding length of the hopper), the lower part of the hopper can be opened and the charge dumped into the space between the two bells, with a single actuating mechanism.
  • Yet a further feature of the invention is a protective element forthe small bell of cone-shape and tapering upwards to provide good distribution of the charge towards the large bell.
  • the protective element of the small bell a maximum radial dimension less than the maximum radial dimension of that of the small bell and to design the. longitudinal profile of the element so that the trajectory of the charge when sliding down the protective element is directed away from and does not meet the outside edge of the small bell.
  • the lower part of the protective cone may be provided with a deflector by outwardly flaring the lower end of the protective cone proper.
  • This deflector enables the charge in the distributing hopper to be dumped on the large bell without touching the small bell and hence without any wear on the latter.
  • the wear is transferred to the element acting as the mobile hopper bottom,
  • the distributing hopper with a circular seal, on the one hand supported so as to be gastight on and all around the said hopper and, on the other hand fixed to the framework.
  • an orifice is provided between this circular seal and a stop-seal of the bell to let out to recuperators, the small amount of gas escaping at the sides of the small bell whenever it is lowered to dump materials on the large bell, which is closed at that point.
  • FIG. 1 is a vertical section through a furnace charging device
  • FIG. 2 is an enlarged section of a part of the device shown in FIG. 1.
  • a hopper 1 is the receiving hopper into which the skip or other charging means (not shown) delivers the materials to be put into the furnace, i.e. ore, flux and coke.
  • the hopper 1 coaxial with a suspension device 2, dumps its charge into a hopper 3 known as the distributing hopper.
  • TI-Ie hopper 3 has a guiding device allowing it a vertical movement by means of rollers fixed to the hopper and which can move on slide bars 4 supported on the furnace framework 5 under the control of a counterweight device. These slide bars are arranged at two levels around the hopper 3.
  • the framework 5 supporting the hopper 3 can rotate about the longitudinalaxis of the furnace by means of a series of conical rollers 7 with radial axes regularly distributed around the hopper 3 but integral with a guide fixed to an airlock cone 6.
  • the framework 5 rests on the said rollers by means of a raceway 21 provided at the top with a crown gear 22 on a vertical axis, coaxial with the hopper 3 and controlled by a toothed pinion 23 on a vertical axis.
  • the vertical travel of the hopper is limited by stops 8 and 8a integral with the framework 5 on opposite sides thereof.
  • the hopper 3 which has a slightly tapering upper part and a cylindrical lower part, rests by its own weight on a conical base 9 tapering upwards and acting as a protective cone for a small bell 10.
  • the protective cone is suspended by a ball joint from a collar 11, the end ofa tube acting as the suspension rod for the cone.
  • This rod is suspended by clamps and a thrust block from a bracket 12 integral with a hollow sleeve 13 to the end ofwhich is fixed the collar 11.
  • the bell is itself suspended from this collar by means of a ball joint 14.
  • the lower end of the cone 9 is slightly outwardly flared, at 90 as shown in FIG. 2, and its radial dimension is slightly less than that of the small bell.
  • a large bell 18 is suspended by a shackle and pin from a connecting collar 19 fixed to the end of the suspension rod for the large bell.
  • This rod is in the axis of the furnace and it passes through the hollow sleeve 13, in which it can slide by means of a gastight seal 20.
  • the device according to the invention operates as follows:
  • the chamber formed by this large bell, the small bell 10, the airlock cone 6 and the hopper of the large bell must be brought to a pressure at least equal to that in the shaft, which is done by a pipe bringing gas under pressure into the said chamber.
  • the bell 10 While the chamber is pressurized the bell 10 is held on its seat 15 by the pressure force itself, which ensures that the top of the chamber is gastight.
  • the bell can drop and release the charge contained in its hopper.
  • the large bell can rise again and is held against its own seat by means of the pressure in the shaft.
  • the next operation comprises the lowering of the hollow sleeve 13 supporting the small bell.
  • the rod and cone 9 integral with the bell 10 are also lowered.
  • the hopper follows the same movement solely'because it is resting by gravity on the cone 9.
  • the three parts 10, 9 and 3 move down simultaneously until the lower part of the hopper 3 comes below the level of the seal 15.
  • the balancing device of the hopper 3 presses on its stop 8 and halts the hopperwhile the small bell and cone 9 continue their descending movement, releasing the charge in the hopper.
  • This charge cannot reach and wear the seal 15 which is screened by the wall of the hopper, nor can it reach and wear the outer edge of the small bell because of the flared terminal portion 9a of the cone 9 which acts as a deflector.
  • any compressed gases in the chamber between the two bells can escape through the pipe 16.
  • the seal 17 prevents these gases and any dust they contain from escaping into the atmosphere.
  • the hopper 3, once emptied, can be raised without difficulty or strain since its weight is balanced by the counterweight.
  • the small bell is also raised without any special effort.
  • the correct centering of the small bell on the seal 15 and of the cone 9 on the base of the hopper is done automatically and independently by means of the ball joint 14. Once the complete device is back in place, the cycle can start again.
  • the device according to the invention enables the vertical movement of the distributing hopper to be controlled independently ofthe movement of the small bell.
  • the seals, bells and other parts making up the furnace top are in a single piece and can be put in place by dismantling the rod of the large bell within the airlock at the connecting collar 19.
  • the distributing hopper can be given a continuous or discontinuous rotating movement as desired.
  • a charging device for a shaft furnace comprising, a framework a distributing hopper for receiving a furnace charge through charging means, a large bell, a small bell. means suspending said bells with the small bell above the large bell, means defining a chamber between the two bells, the distributing hopper being provided with a device enabling the hopper to slide along its longitudinal axis and with a rotating device, the small bell being provided with a protective element acting as a mobile base for the distributing hopper, the lower part of said hopper resting on said base said protective element having lower terminal edges, a gastight annular seal integral with the framework and arranged at least partially between the-lower terminal edges of the protective element and the small bell, with the small bell, in the raised position pressing against the annular seal, and the sliding device for the distributing hopper having a stop preventing downward movement of the hopper after the lower part of the hopper has reached and is screening the annular seal of the small bell.

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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)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
US714668A 1967-03-20 1968-03-20 Charging device for a furnace Expired - Lifetime US3554393A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU53230 1967-03-20

Publications (1)

Publication Number Publication Date
US3554393A true US3554393A (en) 1971-01-12

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ID=19725158

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Application Number Title Priority Date Filing Date
US714668A Expired - Lifetime US3554393A (en) 1967-03-20 1968-03-20 Charging device for a furnace

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US (1) US3554393A (en))
BE (1) BE712079A (en))
CS (1) CS187302B2 (en))
DE (1) DE1608300C3 (en))
ES (1) ES351753A1 (en))
FR (1) FR1557299A (en))
GB (1) GB1203876A (en))
LU (1) LU53230A1 (en))
NL (1) NL6803967A (en))
SU (1) SU550124A3 (en))

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3623709A (en) * 1969-08-22 1971-11-30 Delattre Levivier S I D L Soc Apparatus for charging and for distributing charges in shaft furnace
US3679192A (en) * 1970-03-18 1972-07-25 Koppers Co Inc Furnace top charging devices
US5411242A (en) * 1993-03-04 1995-05-02 Paul Wurth S.A. Charging device with member for regulating the flow rate
CN102080927A (zh) * 2010-12-02 2011-06-01 中冶焦耐(大连)工程技术有限公司 一种旋转加料密封装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1238189A (en) * 1984-11-27 1988-06-21 Philippus J. Meyer Gasification of coal
CN103834756B (zh) * 2014-03-25 2015-05-20 中冶南方工程技术有限公司 一种布料器中高炉煤气的水封系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US401394A (en) * 1889-04-16 Charging apparatus for blast-furnaces
US2216116A (en) * 1938-02-09 1940-10-01 Koppers Gmbh Heinrich Contrivance for charging solid fuel into water-gas producers
US3182983A (en) * 1961-04-18 1965-05-11 Yawata Iron & Steel Co Air-tight sealing device for the top of a blast furnace
US3252601A (en) * 1964-07-29 1966-05-24 United States Steel Corp Blast furnace bell suspension and operating mechanism
US3275310A (en) * 1963-12-04 1966-09-27 United States Steel Corp Blast furnace bell
US3302805A (en) * 1963-12-14 1967-02-07 Ishikawajima Harima Heavy Ind Materials distributor of a blast furnace

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US401394A (en) * 1889-04-16 Charging apparatus for blast-furnaces
US2216116A (en) * 1938-02-09 1940-10-01 Koppers Gmbh Heinrich Contrivance for charging solid fuel into water-gas producers
US3182983A (en) * 1961-04-18 1965-05-11 Yawata Iron & Steel Co Air-tight sealing device for the top of a blast furnace
US3275310A (en) * 1963-12-04 1966-09-27 United States Steel Corp Blast furnace bell
US3302805A (en) * 1963-12-14 1967-02-07 Ishikawajima Harima Heavy Ind Materials distributor of a blast furnace
US3252601A (en) * 1964-07-29 1966-05-24 United States Steel Corp Blast furnace bell suspension and operating mechanism

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3623709A (en) * 1969-08-22 1971-11-30 Delattre Levivier S I D L Soc Apparatus for charging and for distributing charges in shaft furnace
US3679192A (en) * 1970-03-18 1972-07-25 Koppers Co Inc Furnace top charging devices
US5411242A (en) * 1993-03-04 1995-05-02 Paul Wurth S.A. Charging device with member for regulating the flow rate
CN102080927A (zh) * 2010-12-02 2011-06-01 中冶焦耐(大连)工程技术有限公司 一种旋转加料密封装置
CN102080927B (zh) * 2010-12-02 2012-08-22 中冶焦耐(大连)工程技术有限公司 一种旋转加料密封装置

Also Published As

Publication number Publication date
FR1557299A (en)) 1969-02-14
CS187302B2 (en) 1979-01-31
DE1608300A1 (de) 1970-12-10
GB1203876A (en) 1970-09-03
DE1608300B2 (de) 1974-07-04
LU53230A1 (en)) 1967-05-22
SU550124A3 (ru) 1977-03-05
BE712079A (en)) 1968-09-12
NL6803967A (en)) 1968-09-23
ES351753A1 (es) 1969-12-01
DE1608300C3 (de) 1975-02-27

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