EP1195565B1 - Dispositif et procede de scellement d'une cloche soufflant de l'air comprime - Google Patents

Dispositif et procede de scellement d'une cloche soufflant de l'air comprime Download PDF

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Publication number
EP1195565B1
EP1195565B1 EP01912290A EP01912290A EP1195565B1 EP 1195565 B1 EP1195565 B1 EP 1195565B1 EP 01912290 A EP01912290 A EP 01912290A EP 01912290 A EP01912290 A EP 01912290A EP 1195565 B1 EP1195565 B1 EP 1195565B1
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EP
European Patent Office
Prior art keywords
sealing
pressurized gas
gas blow
blow hood
rigid body
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.)
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EP01912290A
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German (de)
English (en)
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EP1195565A1 (fr
EP1195565A4 (fr
Inventor
Tsutomu c/o NIPPON STEEL CORPORATION OKADA
Tadao c/o Nippon Steel Corporation IZUMIYAMA
Yoshiaki c/o Nippon Steel Corporation SHIA
Masaaki c/o Nippon Steel Corporation ITINOSE
Youzou c/o Nippon Steel Corporation HOSOTANI
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Nippon Steel Corp
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Nippon Steel Corp
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Publication of EP1195565A1 publication Critical patent/EP1195565A1/fr
Publication of EP1195565A4 publication Critical patent/EP1195565A4/fr
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    • 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
    • F27B19/00—Combinations of furnaces of kinds not covered by a single preceding main group
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • 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
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines
    • 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
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F27D1/1858—Doors
    • F27D2001/1875—Hanging doors and walls
    • F27D2001/1883—Hanging curtains
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D2003/0034—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities
    • F27D2003/0036—Means for moving, conveying, transporting the charge in the furnace or in the charging facilities comprising inflatable or extendable parts

Definitions

  • the present invention relates to an apparatus and a method for sealing a pressurized gas blow hood in a sintering machine in connection to a process for producing sintered ores for blast furnaces.
  • Sintering processes for use in sintering machines include, for example, a pressurized sintering process, which comprises, as shown in Fig. 1, charging a raw mix onto traveling endless palette belt 1 from raw mix hopper 5, igniting raw mix bed 2 at the top by ignition hood 6, introducing pressurized gas to said raw mix bed 2 at the top from pressurized gas blow hood 3 connected to pressurized gas blower 4 downwards, while discharging the gas downwards by suction by exhaust gas blower 11 through wind boxes 8, exhaust gas duct 9 and exhaust gas dust collector 10, and moving said palette belt 1, thereby roasting the raw mix bed from the top layer down to the bottom layer successively.
  • a pressurized sintering process which comprises, as shown in Fig. 1, charging a raw mix onto traveling endless palette belt 1 from raw mix hopper 5, igniting raw mix bed 2 at the top by ignition hood 6, introducing pressurized gas to said raw mix bed 2 at the top from pressurized gas blow hood 3 connected to pressurized gas blower 4 downward
  • Such a pressurized sintering process can improve the product yield in the top layer of raw mix bed 2 and sintered ore quality, for example, by sucking the atmospheric air at the initial period of roasting, while setting the suction pressure in wind boxes 8 to - 9.8 kPa (-1,000 mmAq) relative to the atmospheric pressure, thereby lowering the migration speed of the combusting fused zone from the top layer down to the bottom layer of the raw mix bed, and making the residence time at high temperature longer than the conventional one.
  • the density of the gas flowing through raw mix bed 2 can be increased by forcing the air at a pressure of +19.6 kPa (+2,000 mmAq) relative to the atmospheric pressure into raw mix bed 2 at the top through pressurized gas blow hood 3 connected to pressurized gas blower 4, while withdrawing the exaust gas from the bed at the bottom at a pressure of -9.8 kPa (-1,000 mmAq), thereby establishing a pressure difference of 29.4 kPa (3,000 mmAq) through raw mix bed 2.
  • a coke combustion rate and a heat transfer rate can be increased thereby, resulting in an increase in the migration speed of the combustion fused zone through the bed.
  • an increase in the gas flow rate means an increase in the cooling rate, and thus the thickness in the height direction of the combustion fused zone can be made smaller in the raw mix bed, thereby lowering the gas flow resistance through the combustion fused zone and increasing the migration speed of the combustion fused zone.
  • productivity, product yield and sintered ore quality can be considerably improved in the pressurized sintering process.
  • JP-U-A-61-177797 discloses that "sealing can be attained by providing a material having an appropriate elasticity at the skirts of a fixed type hood and bringing the material in sliding contact with the upper surface of sintering ores".
  • no durable elastic materials capable of sealing by itself alone when brought into sliding contact with irregular surface of sintering ores charged on the traveling palettes have been available yet.
  • JP-U-A-61-141700 discloses that "sealing pieces move to follow the vertical movement of the upper surface of sintering ore bed, whereas a sealing member vertically expands or contracts to follow the vertical movement of the sealing pieces, thereby ensuring satisfactory sealing of the outer periphery of the food".
  • the disclosed method has a difficulty in sealing of corner parts of ore bed between the travelling direction of the palette belt and the lateral direction of the ore bed, requiring an apparatus of considerably large size.
  • the aforementioned prior arts are all based on a mechanism of sliding development between the sealing pieces and the sintering ore bed or between the sealing pieces themselves. That is, as shown in Fig. 2, without any provision of sealing piece 14 between skirt lower edge 13 of pressurized gas blow hood 3 and raw mix bed 2, a large volume of the pressurized gas is leaked from pressurized gas blow hood 3, resulting in a failure to obtain the necessary gas blowing pressure for the pressurized sintering process.
  • the sintering machine is usually in continuous 24-hr operation and the sealing pieces are in constant sliding contact with hard sintered ore powders in the surface layer of raw mix bed, creating very hard conditions as to the wearing of sealing pieces 14. Thus, it is hard to obtain sealing pieces of satisfactory durability (wear resistance). That is, it has been so far desired to develop an epock-making sealing technique capable of maintaining satisfactory sealing with good durability even if brought into sliding contact.
  • an object of the present invention is to provide an apparatus and a method for sealing a pressurized gas blow hood in a sintering machine with good sealability enabling a sufficient pressurized gas blowing from the pressurized gas blow hood provided over the sintering palette belt.
  • the present invention is to solve the aforementioned technical problems, and the gist of the present invention will be summarized as follows:
  • the present inventors have extensively studied an apparatus and a method for improving the durability (wear resistance) and the sealability of a sealing piece for sealing clearances between the skirt lower edge of a pressurized gas blow hood provided above the sintering raw mix bed in the pressurized sintering process and the sintering raw mix bed.
  • the primary function of a sealing piece provided at the skirt lower edge of a pressurized gas blow hood is to thoroughly follow the irregularities on the surface of traveling sintering raw mix bed during the traveling of the sintering raw mix charged in the palette belt in the sintering machine, thereby bringing the sealing piece always in sliding contact with the surface of the sintering raw mix bed and thereby sealing clearances between the pressurized gas blow hood and the surface of the sintering raw mix bed.
  • the secondary function of the sealing piece is to maintain the durability against the wearing, etc., while the sealing piece is in sliding contact with the surface of the sintering raw mix bed.
  • the conventional sealing pieces utilize elastic materials such as rubber, etc. as base materials in the most cases.
  • the surface layer of the sintering raw mix bed in sliding contact with the sealing piece is composed sharp-edged, very hard powders, such as unroasted ore powders, etc. and thus the single use of elastic material such as rubber, etc as a base material for the sealing piece has such a problem as rapid wearing, resulting in a failure to maintain the desired sealing.
  • the present inventors have found that, when a composite material comprising a hard rigid body tips and an elastic body member made by bonding a large number of hard rigid body tips of, e.g. ceramics, etc. to an elastic body member of e.g. rubber, etc. by vulcanization, etc. is used as a base material for the sealing piece, the wearing resistance can be considerably improved, as compared with the conventional sliding piece, while maintaining the equivalent sealability to that of the conventional sealing piece.
  • a sealing piece is provided so that tips (ceramic 15a') can be brought into sliding contact with the surface of sintering raw mix bed.
  • a sheet is made by bonding the hard rigid body tips to an elastic body member such as rubber 15b', etc. by vulcanization, etc. e.g. as shown in Fig. 3(b).
  • the sheet may be bonded to a base rubber processed into the necessary structure by vulcanization, etc.
  • Tip arrangement may be in a lattice pattern as shown in Fig. 3(c) or in a staggered pattern as shown in Fig. 3(d), but cannot be limited thereto so long as the necessary elasticity for sliding can be obtained.
  • the hard rigid body tips exposed from the elastic body member each have a thickness of not more than 5 mm. Above 5 mm, the bonding strength will be lowered, resulting in easy peeling of the tips. It is rather preferable that the elastic body member is extended up to the joints between the ceramics, that is, throughout the surface layer of hard rigid body tips, as shown in Fig. 3(b).
  • a plurality of combinations of tip shapes, materials, etc. can be made, and must be designed in view of surface irregularies of the sintering raw mix bed as well as desired sealability.
  • a sealing piece composed of said composite material comprising hard rigid body tips and an elastic body member is provided at the skirt lower edge of a pressurized gas blow hood, not only the sealability of the pressurized gas blow hood, but also the productivity of sintered ores can be improved without any adverse effect on the gas flow under the sliding contact region of the sealing piece by setting a ratio (w/h) of the width w in the lateral direction (sliding contact distance) of the sealing piece in sliding contact with the surface of the sintering raw mix bed to the thickness h of the sintering raw mix bed to a range of 0.1 to 2, as shown in Figs. 4 to 6.
  • the present invention has been established on the basis of the aforementioned finding, and is to provide an apparatus for sealing a pressurized gas blow hood provided above the sintering raw mix bed charged in an under-suction type sintering machine, characterized in that a sealing piece composed of a composite material comprising hard rigid body tips and an elastic body member is provided at the skirt lower edge of the pressurized gas blow hood, while setting a ratio (w/h) of the width w in the lateral direction of the sealing piece in sliding contact with the surface of the sintering raw mix bed to the thickness h of the sintering raw mix bed to a range of 0.1 to 2.
  • the wear resistance of the sealing piece can be remarkably improved, as compared with the conventional one, by providing a sealing piece composed of a composite material comprising hard rigid body tips and an elastic body member at the skirt lower edge of a pressurized gas blow hood.
  • a sealing piece composed of a composite material comprising hard rigid body tips and an elastic body member at the skirt lower edge of a pressurized gas blow hood.
  • Fig. 8 is a diagram showing relations between a ratio (w/h) of sliding contact distance of a sealing piece to thickness of a raw mix bed and a percent gas leakage
  • Fig. 9 is a diagram showing relations between a ratio (w/h) of sliding contact distance of a sealing piece to thickness of a raw mix bed and a productivity P of sintered ores.
  • productivity P(%) is a ratio relative to the maximum sintered ore productivity when the sintering raw mix bed is subjected to pressurized gas blowing sintering operation under the same conditions except the sliding contact distance of a sealing piece.
  • Fig. 7 is a conceptual view showing gas flows (20 and 21) in the proximity of the sliding contact region between sealing piece 15 and sintering raw mix bed 2 in the pressurized gas blow hood.
  • gas flows in the proximity of the sliding contact region of sealing piece 15 in the pressurized gas blow hood are dependent on a relation between a pressure drop ⁇ P 1 of downward gas flow 21 depending on the thickness h of sintering raw mix bed 2 and a pressure drop ⁇ P 2 of gas flow 20 in the lateral direction depending on the sliding contact distance w.
  • ⁇ P 1 ⁇ ⁇ P 2 i.e.
  • a ratio (w/h) of the width w in the lateral direction of a sealing piece composed of said composite material comprising hard rigid body tips and an elastic body member in sliding contact with a sintering raw mix bed (sliding contact distance) to the thickness h of said sintering raw mix bed is set to a range of 0.1 to 2 in the present invention.
  • a sealing piece composite of a composite material comprising hard rigid body tips and an elastic body member can be obtained, for example, by bonding a large number of hard rigid body tips to an elastic body member by vulcanization, etc.
  • Hard rigid body tips for use in the present invention are composed of a material having at least a higher hardness than that of sintered ore powders in the surface layer of a sintering raw mix bed, and a distinguished wear resistance, and, for example, ceramics, hard metals such as high Cr steal, Cr-Ni alloy, etc., cermets such as WC-Co alloy, WC-NiCr alloy, etc. or the like can be used as such materials.
  • Elastic body member for use in the present invention is composed of a material having such a low hardness and a high flexibility as to thoroughly follow surface irregularities of traveling sintering raw mix bed (difference in surface level: approximately 30-50 mm; intervals: approximately 500-2,000 mm), and, for example, rubbers such as natural rubber, urethane rubber, NBR rubber, CR rubber, fabric-reinforced rubber, etc: or the like can be used as such materials.
  • Composite materials of ceramics and rubber such as commercially available Belcera-sheet (trademark of a product made by Nippon Tsusho K.K.), Gumcera-sheet (trademark of a product made by Santo Kakogyo K.K.), KR Cera-sheet (trademark of a product made by Kawamoto Kogyo K.K.), etc. are well known as composite materials comprising hard rigid body tips and an elastic body member.
  • the shape of hard rigid body tips bonded to the elastic body member is not particularly limited, and any shape such a plate shape, a spherical shape, a cylindrical shape, etc. can be used.
  • the maximum size each of hard rigid body tips exposed from the surface of the elastic body member exceeds 50 mm, the elasticity of the sealing piece will be lowered and also the sealability between the sealing piece and the sintering raw mix bed will be lowered.
  • the maximum size each of the hard rigid body tips exposed from the surface of the elastic body member must be not more than 50 mm.
  • the longest part i.e. the longest size
  • the bonding area between the ceramic tips and the rubber member will be smaller and the ceramic tips will readily fall out, resulting in poor durability.
  • sealability elasticity
  • the smaller size is better.
  • the increased number of ceramic tips will complicate the fabrication of sealing pieces and will lead to a sharp cost increase.
  • Thickness each of plate-shaped hard rigid body tips is preferably 1 mm to 10 mm. Below 1 mm, the sealing piece will be cracked, because the sealing piece is used in a sliding state by pressing the hood down. When there are joints between the ceramic tips, no satisfactory bonding strength can be obtained owing to the smaller thickness. Above 10 mm, the elasticity of the composite material will be reduced, resulting in poor sealability between the sealing piece and the surface of the raw mix bed. When projections are formed on the tip surfaces to prevent the falling-out, the heights of the individual projections are not included in the thickness each of the hard rigid body tips.
  • Interspacing between one plate-shaped hard rigid body tip and another is preferably 0 mm to 3 mm. There is no lower limit to the interspacing. That is, the side of one ceramic tip can be in direct contact with the side of another without any presence of rubber joints therebetween. Above 3 mm, the exposed rubber will be soon worn out, resulting in a decrease in the bonding strength (in spite of good elasticity), and sintered ore powders are to enter the spacings between the ceramic tips to stay therein as starting points for falling out of the ceramic tips.
  • Thickness of a plate-shaped elastic body member is preferably 2 mm to 20 mm excluding the thickness of the ceramic tips (thickness at the joints). Below 2 mm, the strength of the elastic body member per se is so low that the elastic body member will be broken while the sealing piece is in sliding contact. Above 20 mm, the elastic body member will be so stiff that the sealing piece will not follow the surface irregularities of the sintering raw mix bed.
  • the edges of tips to be in sliding contact with the surface of the sintering raw mix bed are rounded or filed smooth, because this can dampen the shock given to the ceramic tips by the sintered ore powders, while the sealing piece slides over the surface of the sintering raw mix bed, thereby preventing the edges of the ceramic tips from breakage or from falling-out.
  • the plate-shaped ceramic tips are provided with falling out-preventing projections, whereby contact area between the ceramic tips and the rubber member can be increased to prevent the ceramic tips from falling out, thereby largely improving the durability.
  • Shape of the projections is not particularly limited, and any shape, for example, a rail shape, a cylindrical shape, a trapezoidal shape, etc. can be used.
  • Sizes (thickness) of hard rigid body tips i.e. the longest diameter in the case of a spherical shape and the longest diameter at the bottom or top surface or the height in the case of a cylindrical shape, in other words, the longest diameter of sperical and cylindrical shapes, is preferably 5 mm to 50 mm, for the same reasons as for the plate-shaped tips.
  • Interspacing between one spherical or cylindrical hard rigid body tip and another is 0 mm to 3 mm, when the tips are arranged at equal interspacing, as shown in Figs. 3 (e) and 3 (f), for the same reasons as for the plate-shaped tips.
  • the tips may be arranged at random, as shown in Fig. 3 (g), where t 1 is the height of exposed tips (ceramic tip 15a'), t 2 is the thickness of tip layer and t 3 is the thickness of elastic body member.
  • Thickness of the elastic body member is preferably 2 mm to 20 mm excluding the thickness of ceramic tip layer at the joints, for the same reasons as for the plate-shaped tips.
  • Thickness of the hard rigid body tip layer is preferably 5 mm to 50 mm.
  • the composite material will be unpractical from the viewpoints of necessary bonding, fabrication, etc. due to the tip size, whereas in the case of tip layer having a thickness of more than 50mm, the composite material will be harder and poorer in the elasticity.
  • extension of the elastic body member into the interspacings between ceramic tips is preferable from the viewpoint of bonding, though irrelevant particularly to the thickness of hard rigid body tip layer and thickness of the elastic body member.
  • Sealing piece composed of said composite material comprising hard rigid body tips and an elastic body member has satisfactory elasticity and wear resistance, and thus only replacement of sealing piece 14 in the conventional apparatus for sealing a pressurized gas blow hood with sealing piece 15 composed of a composite material comprising hard rigid body tips and an elastic body member according to the present invention can attain tight sealing of the sealing piece to the surface of sintering raw mix bed 2 by the positive inner pressure provided in pressurized gas blow hood 3. In that case, to prevent the sliding sealing piece from outward turning up, lower edge 15c of the sealing piece can be fixed by a wire or spring 16, as shown in Fig. 4.
  • a method of providing a sealing piece composed of a composite material comprising hard rigid body tips and an elastic body member at the skirt lower edge of a pressurized gas blow hood is not particularly limited, but to enhance the tight sealing between the sealing piece and the surface of the sintering raw mix bed, it is very effective to use such apparatus for sealing a pressurized gas blow hood as shown in Figs. 4 to 6.
  • Fig. 4 shows an apparatus for sealing a pressurized gas blow hood, which comprises support member 19 provided at skirt lower edge 13 of a pressurized gas blow hood, and sealing piece 15 composed of a composite material comprising ceramic tips and a rubber member, the upper edge of said sealing piece 15 being fixed to the outside edge of support member 19 (side wall 19b provided at upper wall 19a of support member 19), and lower edge 15c of said sealing piece 15 being connected to the inside edge of support member (bottom 19c of support member 19) through spring 16 according to one embodiment of the present invention.
  • the spring connection position is not limited to the inside edge of support member 19. That is, a plurality of springs 16 can be provided at positions in the lateral direction and within the region corresponding to the sliding contact distance w of sealing piece 15 with the surface of sintering raw mix bed 2.
  • sealing piece 15 By connecting sealing piece 15 to support member 19 provided at skirt lower edge 13 of the pressurized gas blow hood through spring 16, the followability and sliding contactability of sealing piece 15 with the surface of sintering raw mix bed 2 can be improved through the expanding or contracting action of spring 16, thereby maintaining more stable sealability.
  • Fig. 5 shows an apparatus for sealing a pressurized gas blow hood, which comprises support member 19 provided at skirt lower edge 13 of a pressurized gas blow hood and sealing piece 15 composed of a composite material comprising ceramic tips and a rubber member, said sealing piece 15 being fixed to support member 19 through bulky elastic body member 17 according to another embodiment of the present invention.
  • Bulky elastic body member 17 is not particularly limited, and sponge rubber, a gas or liquid-inflated tube, a flexible metal such as a metal in bellows structure, or the like can be used.
  • sealing piece 15 composed of a composite material comprising hard rigid body tips and an elastic body member of the present invention to at least the surface at the lower part of bulky elastic body member 17, which faces the sliding contact surface of sintering raw mix bed 2, sealing piece 15 can be fixed to support member 19. Sealing piece 15 can be directly fixed to support member 19 without bonding sealing piece 15 to bulky elastic body member 17.
  • the width depends on a ratio w/h set forth by the sealability and the productivity.
  • the length is large enough to absorb surface irregularities of sintering raw mix bed 2. Let the surface irregularities be l and then the length will be 2 l to 10 l . Below 2 l , no surface irregularities can be absorbed, above 10 l the sealing piece becomes unstable and will fall out from the support member at the fixing position.
  • sealing piece 15 By connecting sealing piece 15 to support member 19 provided at skirt lower edge 13 of the pressurized gas blow hood through bulky elastic member, the followability and sliding contactablity of sealing piece 15 with the surface of sintering raw mix bed 2 can be improved through the elasticity of bulky elastic body member, thereby maintaining more stable sealability.
  • sponge rubber When sponge rubber is used for the bulky elastic body member, such well known rubber as chloroprene rubber, ethylene-propylene rubber, nitrile rubber, natural isoprene rubber, styrene-butadiene rubber, etc. can be used. Among them, soft rubber with a low hardness, such as those with ASKAR-C and a hardness of 8 can be preferably used.
  • Fig. 6 shows an apparatus for sealing a pressurized gas blow hood, which comprises inner pressure-adjustable air duct 18 provided at skirt lower edge 13 of a pressurized gas blow hood and sealing piece 15 composed of a composite material comprising ceramic tips and a rubber member of the present invention under bottom 18c of said air duct 18 according to other embodiment of the present invention.
  • sealing piece 15 When air is supplied into air duct 18 from the overhead in the apparatus for sealing the pressurized air blow hood to develop an inner pressure, sealing piece 15 will be expanded like a tire tube to further improve the tight sealing between sealing piece 15 and sintering raw mix bed 2.
  • the inner pressure can be controlled by adjusting the air feed rate to air duct 18 in the apparatus for sealing the pressurized gas blow hood to uniformly press sealing piece 15 toward the entire sliding contact surface of sintering raw mix bed 2, thereby absorbing irregularities distributed unevenly and at random on the surface of sintering raw mix bed 2.
  • the sliding contact, sealability and durability (wear resistance) of sealing piece 15 can be further improved.
  • Size of air duct 18 can be determined in the same manner as for the bulky elastic body member.
  • FIGs. 4 to 6 schematic views of providing sealing piece 15 of the present invention at skirt lower edge 13 at both sides of pressurized gas blow hood 3 are shown, but the sealing piece can be provided not only at the skirt lower edge at both sides of the pressurized gas blow hood, but also at the skirt lower edge at the inlet side, the outlet side or at the entire periphery, or can be provided continuously at the entire periphery or in dividedly predetermined sizes.
  • a magnet can be provided above sealing piece 15 to magnetically attract sintered ore powders in the surface layer of sintering raw mix bed 2 toward the surface of sealing piece 15, thereby enhancing the tight sealability between sealing piece 15 and sintering raw mix bed 2 to further improve the sealability.
  • a sintering machine (sintering palette belt width: 4 m; sintering machine length: 100 m) was operated at a negative suction pressure of 12.74 kPa (1,300 mmAq), a raw mix bed thickness h of 550 mm and a constant palette belt speed of 3.5 m/s.
  • a pressurized gas blow hood with such sizes as width: 3.5 m and length: 30 m was provided above the sinter strands at the sintered ore discharge side in a distance (height) between the skirt lower edge and the surface of the raw mix bed of 200 mm.
  • Gas blow rate from the pressurized gas blow hood was set to constant 8.5 ⁇ 10 5 Nm 3 /hr, and to evaluate the sealability, a gas leakage rate was calculated from a difference between a pressurized gas blow rate and a suction gas rate to obtain a percent gas leakage. Life of the composite material was the time required until the inner pressure of 7.84 kPa (800 mmAq) in the pressurized gas blow hood was lowered to 6.86 kPa (700 mmAq).
  • Example 1 of the present invention apparatus 15 for sealing pressurized gas blow hood 3 in the structure as shown in Fig. 4 was used with a composite material sheet comprising ceramic tips and a rubber member and having a thickness of 5 mm on the whole, prepared by bonding a large number of 2 mm-thick ceramic tips in a square shape, 10 mm ⁇ 10 mm in the horizontal cross-section, to a natural rubber sheet by vulcanization, as sealing piece 15 composed of a composite material comprising ceramic tips and a rubber member, where the interspacing between the ceramic tips was 1 mm.
  • Bottom 19c of the upper wall of support member 19 was connected to lower edge 15c of sealing piece 15 through springs 16 at intervals of 300mm in the longitudinal direction of the pressurized gas blow hood.
  • Example 2 of the present invention an apparatus for sealing pressurized gas blow hood 3 in the structure as shown in Fig. 5 was used, where side wall 19b of the support member with equal flanges at both edges was 50 mm high and upper wall 19a thereof was 200 mm wide, and sealing piece 15 was provided along the entire periphery of the hood.
  • the same sealing piece as shown in Example 1 of the present invention was used as sealing piece 15 composed of a composite material comprising ceramic tips and a rubber member, and bonded to the surface of sponge rubber 17, followed by fixing to support member 19.
  • the sponge rubber was fixed to the bottom of support member 19 along the entire periphery of the hood, while keeping the distance (height) of the skirt lower edge from the surface of the sintering raw mix bed at 200 mm.
  • an apparatus for sealing pressurized gas blow hood 3 in the structure as shown in Fig. 6 was used with a composite material sheet comprising ceramic tips and a rubber member and having a thickness of 5 mm on the whole, prepared by bonding a large number of 2mm-thick ceramic tips in a square shape, 5 mm ⁇ 5 mm, 10 mm ⁇ 10 mm or 60 mm ⁇ 60 mm in the horizontal cross-section, to a natural rubber sheet by vulcanization, as sealing piece 15 composed of a composite material comprising ceramic tips and a rubber member, where the interspacing between the ceramic tips was 1 mm.
  • the sealing piece was provided along the entire periphery of the hood.
  • Comparative Example 1 an apparatus for sealing a pressurized gas blow hood in the structure as shown in Fig. 2 was used with fabric-reinforced urethane rubber, 3mm thick, as sealing piece 14, where the lower edge of sealing piece 14 was pulled inwardly by strings so that sealing piece 14 may not be turned up.
  • urethane rubber is more distinguished in the wear resistance than NBR rubber used for sealing piece 15 of Examples 1 to 6 of the present invention.
  • Example 2 conditions were all the same as in Example 3 of the present invention, except the sliding contact distance w of sealing piece 15.
  • Table 1 shows percent gas leakage from the pressurized gas blow hood and life of sealing piece apparatuses for sealing the pressurized gas blow hood of Examples 1 to 6 of the present invention and Comparative Examples 1 to 3.
  • Table 1 Ceramic tip maximum size (mm) Sliding contact distance w (mm) Bed thickness h (mm) w/h Percent gas leakage (%) Sintering productivity (%) Sealing piece life (days)
  • Example 1 10 200 550 0.36 5 42.3 540
  • Example 2 10 200 550 0.36 2 43.2 360
  • Example 6 60 180 550 0.33 9 41.2 1050 Comp. Ex. 1 - 200 550 0.36 3 42.6 3 Comp. Ex. 2 10 30 550 0.05 20 36.3 750 Comp. Ex. 3 10 1400 550 2.54 0 35.1 680
  • Examples 1 to 6 of the present invention show remarkable improvements of percent gas leakage from the pressurized gas blow hood and life of the sealing piece, as compared with Comparative Examples 1 to 3 showing departure from the scope of the present invention.
  • the present invention provides an apparatus and a method for sealing a pressurized gas blow hood provided above the sintering raw mix bed charged onto a sintering palette belt in the pressurized sintering process, which can maintain good sealability and durability of the pressurized gas blow hood, and remarkable effects on improved productivity of sintered ores, and product yield and quality in the pressurized sintering process can be obtained, as compared with the conventional art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)

Claims (38)

  1. Appareil pour sceller une cloche soufflant du gaz comprimé disposée au-dessus du lit de mélange brut de frittage chargé dans une machine de frittage de type à succion par le bas,
    caractérisé en ce qu'
    une pièce de scellement composée d'un matériau composite comprenant des pointes de corps rigides et dures et un élément de corps élastique est disposée au niveau du bord inférieur de collerette de la cloche soufflant du gaz comprimé, tout en fixant un rapport (w/h) entre la largeur w dans la direction latérale de la pièce de scellement en contact coulissant avec la surface du lit de mélange brut de frittage et l'épaisseur h du lit de mélange brut de frittage dans une plage allant de 0,1 à 2.
  2. Appareil pour sceller une cloche soufflant du gaz comprimé selon la revendication 1,
    caractérisé en ce que
    la pièce de scellement est composée d'un matériau composite dans lequel les pointes de corps rigides et dures sont fixées à la couche de surface de l'élément de corps élastique, de sorte que les pointes de corps rigides et dures exposées à partir de la couche de surface de l'élément de corps élastique puissent avoir chacune une taille maximale de pas plus de 50 mm dans la direction horizontale de la pointe de corps rigide et dure.
  3. Appareil pour sceller une cloche soufflant du gaz comprimé selon la revendication 1,
    caractérisé en ce que
    la pièce de scellement est composée d'un matériau composite dans lequel les pointes de corps rigides et dures sont fixées à la couche de surface de l'élément de corps élastique de sorte que les pointes de corps rigides et dures exposées à partir de la couche de surface de l'élément de corps élastique puissent avoir chacune une taille de pas inférieure à 5 mm dans la direction horizontale de la pointe de corps rigide et dure.
  4. Appareil pour sceller une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 1 à 3,
    caractérisé en ce que
    la pièce de scellement est composée d'un matériau composite dans lequel les pointes de corps rigides et dures sont fixées à la couche de surface de l'élément de corps élastique, de sorte que les pointes de corps rigides et dures exposées à partir de la couche de surface de l'élément de corps élastique puissent avoir chacune une épaisseur de pas supérieure à 5 mm.
  5. Appareil pour sceller une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 1 à 4,
    caractérisé en ce que
    les pointes de corps rigides et dures sont composées d'au moins un élément parmi la céramique, un métal dur et un cermet.
  6. Appareil pour sceller une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 1 à 5,
    caractérisé en ce que
    les pointes de corps rigides et dures ont au moins comme forme une forme plate, une forme sphérique ou une forme cylindrique.
  7. Appareil pour sceller une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que
    lorsque les pointes de corps rigides et dures ont une forme plate, celles-ci ont chacune une épaisseur de 1 mm à 10 mm.
  8. Appareil pour sceller une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 1 à 6,
    caractérisé en ce que
    lorsque les pointes de corps rigides et dures ont une forme sphérique ou cylindrique, la couche des pointes de corps rigides et dures composées de pointes de corps rigides et dures sphériques ou cylindriques a une épaisseur de 5 mm à 50 mm.
  9. Appareil pour sceller une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 1 à 8,
    caractérisé en ce que
    l'élément de corps élastique est composé de caoutchouc.
  10. Appareil pour sceller une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 1 à 9,
    caractérisé en ce que
    le matériau composite est composé de sorte que les pointes de corps rigides et dures puissent être fixées à la couche de surface de l'élément de corps élastique pour que ce dernier puisse avoir une épaisseur de 2 mm à 20 mm.
  11. Appareil pour sceller une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 1 à 10,
    caractérisé en ce qu'
    un élément de support est disposé au niveau du bord inférieur de collerette de la cloche soufflant du gaz comprimé, le bord supérieur de la pièce de scellement est fixé à la paroi latérale de l'élément de support et le bord inférieur de la pièce de scellement est relié au fond de la paroi supérieure de l'élément de support par l'intermédiaire d'un ressort.
  12. Appareil pour sceller une cloche soufflant du gaz comprimé selon la revendication 11,
    caractérisé en ce que
    les pointes de corps rigides et dures sont amenées en contact coulissant avec le lit de mélange brut de frittage, et l'un des bords de l'élément de corps élastique est fixé à l'extérieur de la paroi latérale dépassant vers le bas de la paroi supérieure de l'élément de support.
  13. Appareil pour sceller une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 1 à 10,
    caractérisé en ce qu'
    un élément de support est disposé au niveau du bord inférieur de collerette de la cloche soufflant du gaz comprimé, et la pièce de scellement est fixée à l'élément de support par l'intermédiaire d'un élément de corps élastique volumineux.
  14. Appareil pour sceller une cloche soufflant du gaz comprimé selon la revendication 13,
    caractérisé en ce que
    l'élément de support comprend une paroi supérieure disposée au niveau du bord inférieur de collerette et une paroi latérale dépassant vers le bas de la paroi supérieure de l'élément de support, la paroi latérale étant dirigée pour fixer l'élément de corps élastique volumineux en maintenant la partie supérieure de l'élément de corps élastique volumineux avec la paroi supérieure de l'élément de support.
  15. Appareil pour sceller une cloche soufflant du gaz comprimé selon les revendications 13 et 14,
    caractérisé en ce que
    la pièce de scellement est composée de sorte que les pointes de corps rigides et dures puissent être amenées en contact coulissant avec le lit de mélange brut de frittage et que le bord de l'élément de corps élastique constituant la pièce de scellement puisse être fixé à la paroi latérale de l'élément de corps élastique volumineux.
  16. Appareil pour sceller une cloche soufflant du gaz comprimé selon les revendications 13 et 14,
    caractérisé en ce que
    la pièce de scellement est composée de sorte que les pointes de corps rigides et dures puissent être amenées en contact coulissant avec le lit de mélange brut de frittage et que le bord de l'élément de corps élastique constituant la pièce de scellement puisse être directement fixé à l'élément de support.
  17. Appareil pour sceller une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 1 à 16,
    caractérisé en ce que
    l'élément de corps élastique volumineux est composé d'au moins un élément parmi un caoutchouc spongieux, un tube et un métal flexible.
  18. Appareil pour sceller une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 1 à 10,
    caractérisé en ce qu'
    un conduit d'air à pression intérieure réglable est disposé au niveau du bord inférieur de collerette de la cloche soufflant du gaz comprimé, et la pièce de scellement est disposée au fond du conduit d'air.
  19. Appareil pour sceller une cloche soufflant du gaz comprimé selon la revendication 18,
    caractérisé en ce que
    le conduit d'air comprend une paroi supérieure de conduit d'air disposée au niveau du bord inférieur de collerette, une paroi latérale de conduit d'air dépassant vers le bas de la paroi supérieure de conduit d'air, la paroi latérale étant dirigée pour fixer le bord supérieur d'une pièce de scellement en forme de poche à laquelle l'air doit être envoyé, avec un orifice d'alimentation en air, disposé au niveau de la paroi supérieure de conduit d'air, dirigé pour acheminer l'air dans le conduit d'air.
  20. Appareil pour sceller une cloche soufflant du gaz comprimé selon la revendication 18 ou 19,
    caractérisé en ce que
    le conduit d'air comprend une paroi supérieure de conduit d'air disposée au niveau du bord inférieur de collerette, une paroi latérale de conduit d'air dépassant vers le bas de la paroi supérieure de conduit d'air, la paroi latérale étant dirigée pour fixer le bord supérieur d'une pièce de scellement en forme de poche à laquelle l'air doit être envoyé à travers un tube d'air, ce dernier étant disposé dans le conduit d'air, avec un orifice d'alimentation en air, disposé au niveau de la paroi supérieure de conduit d'air, dirigé pour acheminer l'air dans le tube d'air.
  21. Procédé de scellement d'une cloche soufflant du gaz comprimé disposée au-dessus d'un lit de mélange brut de frittage chargé dans une machine de frittage de type à succion par le bas,
    caractérisé en ce qu'
    on installe une pièce de scellement composée d'un matériau composite comprenant des pointes de corps rigides et dures et un élément de corps élastique au niveau du bord inférieur de collerette de la cloche soufflant du gaz comprimé, tout en fixant un rapport (w/h) entre la largeur w dans la direction latérale de la pièce de scellement en contact coulissant avec la surface du lit de mélange brut de frittage, et l'épaisseur h du lit de mélange brut de frittage dans une plage allant de 0,1 à 2.
  22. Procédé de scellement d'une cloche soufflant du gaz comprimé selon la revendication 21,
    caractérisé en ce que
    la pièce de scellement est composée d'un matériau composite dans lequel les pointes de corps rigides et dures sont fixées à la couche de surface de l'élément de corps élastique de sorte que les pointes de corps rigides et dures exposées à partir de la couche de surface de l'élément de corps élastique puissent avoir chacune une taille maximale inférieure à 50 mm dans la direction horizontale de la pointe de corps rigide et dure.
  23. Procédé de scellement d'une cloche soufflant du gaz comprimé selon la revendication 22,
    caractérisé en ce que
    la pièce de scellement est composée d'un matériau composite dans lequel les pointes de corps rigides et dures sont fixées à la couche de surface de l'élément de corps élastique de sorte que les pointes de corps rigides et dures exposées à partir de la couche de surface de l'élément de corps élastique puissent avoir chacune une taille supérieure à 5 mm dans la direction horizontale de la pointe de corps rigide et dure.
  24. Procédé de scellement d'une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 21 à 23,
    caractérisé en ce que
    la pièce de scellement est composée d'un matériau composite dans lequel les pointes de corps rigides et dures sont fixées à la couche de surface de l'élément de corps élastique de sorte que les pointes de corps rigides et dures exposées à partir de la couche de surface de l'élément de corps élastique puissent avoir chacune une épaisseur inférieure à 5 mm.
  25. Procédé de scellement d'une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 21 à 24,
    caractérisé en ce que
    les pointes de corps rigides et dures sont composées d'au moins un élément parmi la céramique, un métal dur et un cermet.
  26. Procédé de scellement d'une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 21 à 25,
    caractérisé en ce que
    les pointes de corps rigides et dures ont au moins comme forme une forme plate, une forme sphérique ou une forme cylindrique.
  27. Procédé de scellement d'une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 21 à 26,
    caractérisé en ce que
    lorsque les pointes de corps rigides et dures ont une forme plate, celles-ci ont chacune une épaisseur de 1 mm à 10 mm.
  28. Procédé de scellement d'une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 21 à 26,
    caractérisé en ce que
    lorsque les pointes de corps rigides et dures ont une forme sphérique ou cylindrique, la couche des pointes de corps rigides et dures composées de pointes de corps rigides et dures sphériques ou cylindriques a une épaisseur de 5 mm à 50 mm.
  29. Procédé de scellement d'une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 21 à 28,
    caractérisé en ce que
    l'élément de corps élastique est composé de caoutchouc.
  30. Procédé de scellement d'une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 21 à 29,
    caractérisé en ce que
    le matériau composite est composé de sorte que les pointes de corps rigides et dures puissent être fixées à la couche de surface de l'élément de corps élastique et que ce dernier puisse avoir une épaisseur de 2 mm à 20 mm.
  31. Procédé de scellement d'une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 21 à 30,
    caractérisé en ce qu'
    un élément de support est disposé au niveau du bord inférieur de collerette de la cloche soufflant du gaz comprimé, le bord supérieur de la pièce de scellement est fixé à la paroi latérale de l'élément de support et le bord inférieur de la pièce de scellement est relié au fond de la paroi supérieure de l'élément de support par l'intermédiaire d'un ressort.
  32. Procédé de scellement d'une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 21 à 30,
    caractérisé en ce qu'
    un élément de support est disposé au niveau du bord inférieur de collerette de la cloche soufflant du gaz comprimé et la pièce de scellement est fixée à l'élément de support par l'intermédiaire d'un élément de corps élastique volumineux.
  33. Procédé de scellement d'une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 21 à 30,
    caractérisé en ce qu'
    un élément de support est disposé au niveau du bord inférieur de collerette de la cloche soufflant du gaz comprimé, la pièce de scellement est fixée à l'élément de support par l'intermédiaire d'un élément de corps élastique volumineux, et le bord supérieur de la pièce de scellement est directement fixé à la paroi latérale de l'élément de support.
  34. Procédé de scellement d'une cloche soufflant du gaz comprimé selon la revendication 32 ou 33,
    caractérisé en ce que
    l'élément de corps élastique volumineux est composé d'au moins un élément parmi un caoutchouc spongieux, un tube et un métal flexible.
  35. Procédé de scellement d'une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 21 à 30,
    caractérisé en ce qu'
    un conduit d'air à pression intérieure réglable est disposé au niveau du bord inférieur de collerette de la cloche soufflant du gaz comprimé, et la pièce de scellement est disposée au fond du conduit d'air, la pression étant réglable par une vitesse d'alimentation en air vers le conduit d'air.
  36. Procédé de scellement d'une cloche soufflant du gaz comprimé selon la revendication 35,
    caractérisé en ce que
    l'air est acheminé vers le conduit d'air de sorte qu'un pourcentage de fuite de gaz η puisse être maintenu dans une plage de 0,1 % à 10 %.
  37. Procédé de scellement d'une cloche soufflant du gaz comprimé selon l'une quelconque des revendications 21 à 30,
    caractérisé en ce qu'
    un conduit d'air à pression intérieure réglable est disposé au niveau du bord inférieur de collerette de la cloche soufflant du gaz comprimé, la pièce de scellement est disposée au fond du conduit d'air, et un tube d'air est disposé dans le conduit d'air, l'ait étant acheminé dans le tube d'air et la pression dans le conduit d'air étant réglable par une vitesse d'alimentation en air vers le conduit d'air.
  38. Procédé de scellement d'une cloche soufflant du gaz comprimé selon la revendication 37,
    caractérisé en ce que
    l'air est acheminé vers le tube d'air de sorte qu'un pourcentage de fuite de gaz η puisse être maintenu dans une plage de 0,1 % à 10 %.
EP01912290A 2000-03-15 2001-03-13 Dispositif et procede de scellement d'une cloche soufflant de l'air comprime Expired - Lifetime EP1195565B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2000072606 2000-03-15
JP2000072606 2000-03-15
JP2001004454A JP3990540B2 (ja) 2000-03-15 2001-01-12 加圧送風フードのシール装置およびシール方法
JP2001004454 2001-01-12
PCT/JP2001/001937 WO2001069153A1 (fr) 2000-03-15 2001-03-13 Dispositif et procede de scellement d'une cloche soufflant de l'air comprime

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EP1195565A1 EP1195565A1 (fr) 2002-04-10
EP1195565A4 EP1195565A4 (fr) 2004-02-18
EP1195565B1 true EP1195565B1 (fr) 2007-03-07

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CN102788506B (zh) * 2012-08-29 2014-08-06 中冶长天国际工程有限责任公司 点火炉用遮热板的控制方法及其控制系统
UA111294C2 (uk) * 2012-10-08 2016-04-11 Оутотек (Фінленд) Ой Машина для термічної обробки сипучого матеріалу
CN106288801B (zh) * 2015-05-22 2018-12-07 华北理工大学 一种烧结机自动化随动式首尾密封装置
EP3587975A4 (fr) * 2017-02-27 2020-01-01 JP Steel Plantech Co. Machine de frittage pour minerai fritté
EP3372935A1 (fr) * 2017-03-08 2018-09-12 Paul Wurth S.A. Dispositif de transport de matériaux en vrac
CN107677130B (zh) * 2017-11-09 2024-01-30 马鞍山钢铁股份有限公司 一种烧结过程喷加可燃性气体的导流密封罩
BE1028148B1 (de) * 2020-03-13 2021-10-11 Thyssenkrupp Ind Solutions Ag Kühler zum Kühlen von Schüttgut, insbesondere Zementklinker
CN115280089A (zh) * 2020-03-13 2022-11-01 蒂森克虏伯工业解决方案股份公司 用于冷却松散材料、特别是水泥熟料的冷却器
CN115306900A (zh) * 2022-07-04 2022-11-08 成都建筑材料工业设计研究院有限公司 一种自扰流防窜风多孔窄平板缝隙结构的密封装置

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JPS6012516U (ja) * 1983-07-05 1985-01-28 住友金属工業株式会社 コンベアベルト
JPS61141700U (fr) * 1985-02-20 1986-09-02
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JPH08268520A (ja) * 1995-03-30 1996-10-15 Nippon Tsusho Kk 工業機材の耐摩耗性表層構造
JP2000018833A (ja) * 1998-06-30 2000-01-18 Nippon Steel Corp 焼結設備における加圧フードシール装置
JP2000249474A (ja) * 1999-02-25 2000-09-14 Nippon Steel Corp 焼結設備の加圧送風フードシール装置
JP4394768B2 (ja) * 1999-02-25 2010-01-06 新日本製鐵株式会社 加圧送風フードシール装置およびそれを用いたシール方法

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CN1380967A (zh) 2002-11-20
DE60127064D1 (de) 2007-04-19
KR20020002359A (ko) 2002-01-09
BR0105092A (pt) 2002-02-13
EP1195565A1 (fr) 2002-04-10
AU753236B2 (en) 2002-10-10
DE60127064T2 (de) 2007-11-15
EP1195565A4 (fr) 2004-02-18
CN1220856C (zh) 2005-09-28
BR0105092B1 (pt) 2010-08-24
WO2001069153A1 (fr) 2001-09-20
AU4111201A (en) 2001-09-24
JP2001330374A (ja) 2001-11-30
KR100513206B1 (ko) 2005-09-08
JP3990540B2 (ja) 2007-10-17

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