US3913755A - Discharging device of a shaft furnace having cooling means - Google Patents

Discharging device of a shaft furnace having cooling means Download PDF

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Publication number
US3913755A
US3913755A US463687A US46368774A US3913755A US 3913755 A US3913755 A US 3913755A US 463687 A US463687 A US 463687A US 46368774 A US46368774 A US 46368774A US 3913755 A US3913755 A US 3913755A
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US
United States
Prior art keywords
rotor
stationary table
furnace
discharging device
rotary shaft
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
US463687A
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English (en)
Inventor
Kenjiro Kambara
Sakae Tanaka
Satoru Miyasita
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
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
Priority claimed from JP5179473A external-priority patent/JPS532122B2/ja
Priority claimed from JP6644773A external-priority patent/JPS5631793B2/ja
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Application granted granted Critical
Publication of US3913755A publication Critical patent/US3913755A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/21—Arrangements of devices for discharging
    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/24—Cooling arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen

Definitions

  • a rotary shaft extends through the stationary table Field of Search........ 214/18 R, 18 V, 2!, 17 D; which fixedly supports a rotor provided above the sta- 222/409 tionary table which rotor shape and diameter have a specific relation with the inside diameter of the fur- References Cited nace.
  • Each of the stationary table, the rotor and the UNITED STATES PATENTS shielding wall of the furnace has hollow space formed therein so that it forms a jacket through which cooling United States Patent Kambara et al.
  • FIG.3c FIG.3d
  • the present invention relates to a discharging device constituted as a cooling and sheltering construction for discharging continuously and evenly lumpy, pelletized or granulated iron ore having been reduced by means of reducing gas including as main components CO and H in a shaft furnace.
  • iron oxide in the granular or lump form (such as pellets or iron ore in the uniform lump form and the like) has heretofore been charged in the furnace from the upper side thereof and the high temperature atmospheric gas, fuel, air and other gases are introduced into the furnace through the lower side wall or from the bottom thereof so that the charged materials in the granular or lump form are contacted with the high temperature gas in the counterflow thereby effecting the gas reduction operation to the charged materials by the heat treatment thereof, the charged materials in the granular or lump form thus heat treated being cut out and discharged from the furnace by actuating the discharging device provided at the lower portion of the furnace so as to obtain reduced iron of the desired reduction rate.
  • the discharging device provided at the lower portion of the furnace so as to obtain reduced iron of the desired reduction rate.
  • the discharging is done in such a manner as to assure uniform descent of the charged materials in the furnace and to minimize the proportion of the materials which is crushed at the discharging device.
  • the heretofore used discharging device is heated to a red hot state under certain circumstances because it contacts with the high temperature atmospheric gas and/or the heat treated charged materials in the granular or lump form held at the high temperature. If the discharging device continues to contact with the heat treated charged materials under the condition described above, the components of the discharging device are extremely worn and the life is shortened.
  • the components of the device may be constructed by heat-resisting and wear-resisting metals.
  • the cost of the equipment is raised enormously, although the life is prolonged.
  • This invention aims at avoiding the above described disadvantages tending to occur due to the conventional discharging device and providing a discharging device having cooling means wherein a rotor shape and diameter have a specific relation with the inside diameter of the shaft furnace, and the reduced iron is continuously and uniformly discharged from the horizontal section of the bottom of the shaft furnace so that the shaft furnace can be effectively operated in manufacturing the reduced iron.
  • the object of this invention is, therefore, to provide a novel and useful discharging device of a shaft furnace having cooling means whereby reduced iron having been treated in the furnace can be continuously and evenly discharged from the horizontal section of the bottom of the. furnace while long life of the discharging device is insured.
  • a first characteristic feature of this invention lies in the fact that the discharging device comprises a stationary table provided at the lower end of the furnace wall of the shaft furnace having circular form in the horizontal section of the bottom thereof with an annular clearance being formed between the lower end of the furnace wall and the stationary table through which the charged materials can be easily passed, a rotor having a shape mainly composed of a curved surface and being located above the stationary table and being supported by a rotary shaft extending through and journaled by the stationary table, the shape of the rotor being of symmetrical form mainly consisting of such curved contour as to give a ratio of its major radius to its minor radius in the range of 1.2 2.0, the atmosphere in contact with the rotor being shielded by the stationary table, the shielding walls and the shut-off valve, the clearance between the rotary shaft and the stationary table being sealed with a sealing member, and the whole being constituted so as not to allow the air direct contact with the lumpy, pelletized or granulated iron ore thus discharged by the rotor.
  • a second characteristic feature of this invention lies in the fact that each of the above described stationary table, the rotor and the shielding walls constructing the discharging device, each of which directly contacts with the charged materials in the granular or lump form which are to be discharged from the furnace and/or the high temperature atmospheric. gas in the furnace, is formed in a jacket structure through which cooling fluid can be circulated, and the inlet and the outlet pipes for circulating the cooling fluid through the jacket formed in the rotor are located in the rotary shaft.
  • the first characteristic feature may be embodied either solely or in combination with the second characteristic feature.
  • FIG. 1 is a side view partly in cross-section showing the cooling means of the discharging device in accordance with this invention arranged at the bottom of a shaft furnace for producing reduced iron;
  • FIG. 2 is a vertical cross-section showing the cooling means incorporated in the rotor and the upper portion of the rotary shaft;
  • FIG. 3 (a), 3 (b), 3 (c) and 3 (d) are plan views respectively showing the various contours of the rotor of this invention.
  • the shaft furnace 1 comprises a furnace wall 3 lined with refractory material 2, and the lower portion of the shaft furnace 1 has a circular form in the horizontal cross-section,
  • a stationary table 4 having a diameter greater than the inner diameter D of the shaft furnace l is arranged at the bottom of the shaft furnace 1.
  • An annular clearance 5 is formed between the stationary table 4 and the lower end of the furnace wall 3 extending circumferentially of the furnace wall 3, the size of the clearance 5 being sufficient to permit the charged materials in the granular or lump form such as reduced iron, for example, to be passed therethrough.
  • a through-hole is formed at the center of the stationary table 4 through which a rotary shaft 6 extends vertically.
  • a rotor 7 in the form of a flat disc having the thickness greater than the size of the grain or lump of the charged materials is fixedly secured to the upper end of the rotary shaft 6, and the contour of the flat surface of the rotor 7 is of symmetrical form mainly consisting of such curved surface as shown in FIGS. 3a, 3b, 3c and 3d rather than a true circle, wherein the ratio r,/r of the major diameter r to the minor diameter r is in the desired range between 1.2 2.0.
  • the lower end of the rotary shaft 6 is rotatably supported by a bearing 8 so that the vertical load applied to the rotor 7 is born by the bearing 8 through the rotary shaft 6. Further, the rotary shaft 6 is journaledat its intermediate portion by another bearing 9 secured to the structure 10 so that the horizontal deviation of the shaft 6 is prevented during the rotational movement of the shaft 6.
  • the rotary shaft 6 is coupled with driving means comprised of a motor 11 and a reduction gear 12 through gears 13 and 14.
  • driving means comprised of a motor 11 and a reduction gear 12 through gears 13 and 14.
  • chain and chain wheel mechanism and the like may be utilized in place of the gears.
  • Shielding walls 15, 15A of the discharging device are provided at the clearance 5 between the furnace wall 3 and the stationary table 4, and one or more discharge passage 17 of the charged materials are arranged at the lower end of the annular hollow space 16 surrounded by the shielding walls 15, 15A.
  • Inclined surfaces 15', 15" are formed at the upper portions of the shielding walls 15, 15A which surround the hollow space 16, so that the materials to be charged which have been processed can easily fall into the discharge passage 17.
  • shut-off value 18 provided at the lower end of the discharge passage 17 may be in the form of a sluice valve
  • tionary table 4 formed therein a hollow space 19 so as to form a jacket structurenFurther, some clearance is formed between the through-hole formed at the center of thestationary table 4 and the rotary shaft 6 extending through the through-hole so as to permit the rotary shaft'6 to be rotated.
  • the lower end of the through-hole is sealed by a sealing member 20 so as to prevent the leakage of the gas out of the furnace or the invasion of the exterior air into the furnace. If the sealing member 20 is normally cooled sufficiently by cooling means, its life is prolonged, and the hollow space 19 of the stationary table 4 is extended along the rotary shaft 6 and the lower end of the extension is also sealed by the sealing member 20.
  • An inlet pipe 21 and an outlet pipe 22 for the cooling fluid are connected to the hollow space 19 so that the cooling fluid such as water, for example, is circulated through the hollow space 19.
  • the rotor7 is made in the form of jacket structure in which a hollow space 23 is formed 25 communicates with a supply tube 29 of the cooling fluid through a rotary joint 28.
  • cooling water such as cooling water
  • the cooling water flows out of the opening 27 and spreads over the disc 26 so that the heat of the rotor 7 isabsorbed by the cooling water to lower the temperature thereof and flows downwardly out of the lower'portion of the disc 26 through the annular clearance between the supply pipe 25 and the inner wall of the rotary shaft to be discharged through the through-hole 30 formed at the lower end of the rotary shaft 6.
  • the discharged fluid is led to the exterior of the device by a groove 31.
  • Each of the shielding walls 15, 15A and the discharge passage 17 surrounded thereby has also formed a hollow space 32, 32' therein so as to form a jacket structure.
  • Supply pipes 33, 33' and discharge pipes 34, 34" for the cooling water are connected to each of the hollow portions 32, 32', respectively, so that the cooling water is circulated through the interior of the shielding walls.
  • the discharging device of this invention is constructed as described above, the iron oxide in the granular or lump form which is charged in the shaft furnace g and the reduced iron ore supported on the stationary table 4 and the rotor 7, and, under such a condition, the motor 11 is energized so as to drive the rotary shaft 6 at a speed of 0.1 2.0 r p.m., so thatthe reduced iron is continuously pushed'outwardly by the side surface or the peripheral surface of the rotor 7 to thereby forcing the reduced iron to be descended from the periphery of the stationary table 4 and to be passed through the clearance 5. The thus fallen reduced iron is discharged through the discharge passage 17.
  • the contour of the rotor 7 having the size satisfying the above mentioned condition and preferably used in the device of this invention is shown in FIGS. 3a, 3b, 3c and 3d, respectively, or the contour of the rotor 7 may include a straight portion.
  • the relationship between the maximum radius r and the minimum radius r of the contour of the rotor shown in FIGS. 3a, 3b, 3c and 3d it has been found that, as the value of r /r approaches 1, the amount of the discharged materials in the granular or lump form will decrease and, when the value r lr is made I, i.e., when the contour of the rotor 7 is made in the circular form, the discharging action is entirely made inoperable.
  • a symmetrical rotor 7 having the ratio r /r of the maximum radius r and the minimum radius r of the rotor 7 selected to be within the rangeof 1:2 2.0 is used and the ratio D/d of the inner diameter D of the shaft furnace and the maximum diameterd of the rotor 7 is limited to be within the range of 112 5.0
  • the reduced iron is continuously discharged at a constant rate, when the rotational speed of the rotor is held constant, and, as a result of this, the reduced iron supported on the stationary table and the rotor is evenly descended, and a stable gas reduction is carried out in the counter flow of the gas contacting with the charged materials, and yet the crushing rate of the processed materials in the granular or lump form is made to the minimum, while the pressure exerted to the rotor is adjusted to be the minimum at the required rate of discharge of the materials.
  • the wear of the various components of the device and the crushed portion of the granular or lump charged materials are made to the minimum by virtue of the circulation of the cooling fluid during the discharging operation, thereby permitting the discharging operation to be carried out without deteriorating the quality of the product.
  • a discharging device with cooling means provided in a shaftfurnace the bottom portion of which has a circular shape in horizontal cross-section said device having a stationary table provided at the lower end of the furnace wall with an annular clearance formed between the lower end of said furnace wall and said stationary table so as to permit the materials charged in said furnace to pass therethrough and a rotor located above said stationary table and supported by a rotary shaft extending through said stationary table, the improvement comprising a first shielding wall extending downwardly from the lower end of said furnace wall past said stationary table, a second shielding wall extending downwardly from the bottom of said stationary table to the same level as the bottom of said first shielding wall, said first and second shielding walls forming a passage therebetween for the discharge of said material, a shut-off valve located at the bottom of said passage to control the rate of discharge of said material from said passage, a sealing member for sealing the clearance between said rotary shaft and said stationary table so that the rotor and the material inside said furnace and passage do not come into direct contact with outside air,
  • Discharging device comprising a jacket structure having a hollow space therein through which a cooling fluid may be circulated, a supply pipe for introducing the cooling fluid into each of the jacket structures and discharging the same therefrom, said jacket structure for said rotor comprising said supply pipe in said rotary shaft extending therethrough and into said hollow space of said rotOl'.
  • Discharging device according to claim 1, wherein jacket structures of said stationary table and said rotor.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
US463687A 1973-05-10 1974-04-24 Discharging device of a shaft furnace having cooling means Expired - Lifetime US3913755A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5179473A JPS532122B2 (ru) 1973-05-10 1973-05-10
JP6644773A JPS5631793B2 (ru) 1972-06-14 1973-06-14

Publications (1)

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US3913755A true US3913755A (en) 1975-10-21

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US (1) US3913755A (ru)
CA (1) CA1027755A (ru)
ES (1) ES426200A1 (ru)
IN (1) IN138907B (ru)
SU (1) SU561526A3 (ru)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0094707A1 (en) * 1982-05-12 1983-11-23 Hoogovens Groep B.V. Method and apparatus for the production of liquid iron from iron oxide
US4897113A (en) * 1985-09-23 1990-01-30 Hylsa, S.A. Direct reduction process in reactor with hot discharge
US5564347A (en) * 1995-04-14 1996-10-15 Oklahoma Gas And Electric Company Ash clinker ramming apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US884620A (en) * 1907-07-25 1908-04-14 Samuel B Sheldon Fuel-feeding device for gas-producing furnaces.
US3064960A (en) * 1961-04-26 1962-11-20 Beckenbach Karl Apparatus for removing burnt or calcined material from furnaces

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US884620A (en) * 1907-07-25 1908-04-14 Samuel B Sheldon Fuel-feeding device for gas-producing furnaces.
US3064960A (en) * 1961-04-26 1962-11-20 Beckenbach Karl Apparatus for removing burnt or calcined material from furnaces

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0094707A1 (en) * 1982-05-12 1983-11-23 Hoogovens Groep B.V. Method and apparatus for the production of liquid iron from iron oxide
US4897113A (en) * 1985-09-23 1990-01-30 Hylsa, S.A. Direct reduction process in reactor with hot discharge
US5564347A (en) * 1995-04-14 1996-10-15 Oklahoma Gas And Electric Company Ash clinker ramming apparatus
US5647287A (en) * 1995-04-14 1997-07-15 Oklahoma Gas And Electric Company Ash clinker ramming apparatus

Also Published As

Publication number Publication date
SU561526A3 (ru) 1977-06-05
ES426200A1 (es) 1976-09-16
CA1027755A (en) 1978-03-14
AU6846974A (en) 1975-11-06
IN138907B (ru) 1976-04-10

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