WO2007100076A1 - Sole tournante - Google Patents

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Publication number
WO2007100076A1
WO2007100076A1 PCT/JP2007/054005 JP2007054005W WO2007100076A1 WO 2007100076 A1 WO2007100076 A1 WO 2007100076A1 JP 2007054005 W JP2007054005 W JP 2007054005W WO 2007100076 A1 WO2007100076 A1 WO 2007100076A1
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WO
WIPO (PCT)
Prior art keywords
expansion
refractory
refractories
irregular
rotary hearth
Prior art date
Application number
PCT/JP2007/054005
Other languages
English (en)
Japanese (ja)
Inventor
Hiroshi Sugitatsu
Takao Umeki
Original Assignee
Kabushiki Kaisha Kobe Seiko Sho
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kabushiki Kaisha Kobe Seiko Sho filed Critical Kabushiki Kaisha Kobe Seiko Sho
Publication of WO2007100076A1 publication Critical patent/WO2007100076A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/216—Sintering; Agglomerating in rotary furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
    • C21B13/105—Rotary hearth-type 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/16—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
    • 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
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/32—Casings
    • F27B9/34—Arrangements of linings
    • 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

  • the present invention relates to a fire hearth rotary hearth provided in a rotary hearth furnace. More specifically, the present invention relates to heating and reducing a carbonaceous material-containing workpiece comprising at least a metal oxide-containing material and a carbon-containing reducing material.
  • the present invention relates to a rotary hearth of a rotary hearth furnace for producing reduced metal. Furthermore, this rotary hearth can also be applied to a rotary hearth furnace used for heating steel materials.
  • a method including a step of charging the agglomerated material into a rotary hearth furnace and heating it to a high temperature to reduce iron oxide in the iron ore to produce solid metallic iron is attracting attention (for example, JP-A-45-19569 and JP-A-11-279611).
  • Such a reduction method can be used not only for the production of metallic iron but also for the production of the non-ferrous metal by reduction of non-ferrous metal oxides such as Ni and Cr.
  • the production of metallic iron is taken as an example, but this does not mean that the present invention described in detail later is limited to the production of metallic iron.
  • the present invention can also be applied to the production of other non-ferrous metals.
  • FIG. 6 is a horizontal sectional view schematically showing a rotary hearth furnace for producing reduced iron.
  • Powdered iron oxide (iron ore, electric furnace dust, etc.) and powdered carbonaceous reductant (coal, cotas, etc.) are mixed and granulated.
  • raw pellets or prickets (hereinafter collectively referred to as pellets) are produced.
  • These raw pellets are heated to a temperature range where combustible volatiles generated from the inside do not ignite as necessary. As a result, the water adhering to the raw pellets is removed, and the raw pellets become dry pellets. This step is unnecessary when the moisture of the raw pellets is low or when the drying is performed in a rotary hearth furnace.
  • the raw pellets or dried pellets (raw material 20) are fed into the rotary hearth furnace 26 by using an appropriate charging device 23. Thereby, a pellet layer having a thickness of about 1 to 2 pellets is formed on the rotary hearth (hereinafter referred to as the hearth) 21.
  • the pellet layer is reduced by radiant heating by combustion of the burner 27 installed in the upper part of the furnace. This reduction advances the metallization of the pellet layer.
  • the metallized pellets are cooled by the cooler 28. As this cooling, cooling power by directly blowing gas onto the pellet or indirect cooling by a water cooling jacket is performed. After cooling, the pellets are discharged out of the furnace by the discharge device 22 after the mechanical strength that can withstand handling during and after discharge is developed.
  • FIG. 7 is a vertical sectional view showing a hearth structure of a rotary hearth furnace for producing reduced iron (hereinafter referred to as a rotary hearth furnace) according to a conventional example.
  • the rotary hearth furnace 1 includes a hood 33 including a ceiling 31 and inner and outer side walls 32, and an annular rotary hearth 10 disposed between the side walls 32.
  • a large number of wheels 34 are attached to the lower part of the rotary hearth 10, and these wheels 34 are driven by a driving device (rotating at a constant speed on a track 35 circulated on the floor surface at a constant speed. (Not shown).
  • the track is fixed to the bottom of the hearth 10 and wheels are arranged on the floor in a circular shape, and the drive device rotates the wheels at a constant speed.
  • a water sealing means 36 is provided between the rotary hearth 10 and the inner and outer side walls 32. This water The sealing means 36 is for blocking the atmosphere in the furnace from the outside air while allowing the rotary hearth 10 to freely rotate with respect to the hood 33.
  • the water sealing means 36 shown in FIG. 7 includes an annular metal sealing trough 38.
  • the seal trough 38 is provided along the lower inner surface of each side wall 32, and the seal trough 38 is filled with water 37.
  • a cylindrical metal skirt 39 projecting downward is provided at the outer peripheral edge of the rotary hearth 10, and the bottom end of the skirt 39 is not in contact with the seal trough 38. Soaked in water 37.
  • the hearth 10 Since the rotary hearth 10 is radiatively heated at a high temperature by the burner 42 installed in the hood 33 with the pellets 40 placed on the upper surface thereof, the hearth 10 has a refractory structure. 41 is adopted.
  • the refractory structure 41 includes a heat-resistant refractory 41a constituting a lower layer portion and a heat-resistant refractory 41b constituting an upper layer portion laminated on the lower layer portion. Since the heating and cooling are repeated every short time (about 6 to 20 minutes) in the vicinity of the upper surface of the hearth 10 where the pellets 40 are placed, the refractory usually has spalling resistance. Is used.
  • the powder foreign matter that enters may inhibit the expansion of the refractory 41 and damage the refractory 41.
  • the refractory 41 was damaged, it was necessary to repair most of the refractory 41 on the 10th floor of the hearth, including removal of the powder foreign material that had entered the gap of the expansion margin.
  • FIG. 8 is a partial plan view of the hearth of the rotary hearth furnace according to these conventional examples.
  • the inner portion of the annular rotary hearth 10 disposed between the inner peripheral wall and the outer peripheral wall of the rotary hearth furnace is formed of a refractory castable layer 55.
  • a plurality of rows of fire bricks 73 and 74 are arranged at positions adjacent to the inner peripheral side and the outer peripheral side with respect to the fire resistant castable layer 55, respectively, and a predetermined interval is provided between the fire bricks 73 and 74.
  • Gaps 57 and 58 are formed (see Patent Document 1). These gaps 57, 58 are capable of absorbing thermal expansion deformation of the refractory castable layer 55 and have a size capable of preventing small diameter pellets from entering the gaps 57, 58. Yes.
  • the inner peripheral edge and the outer peripheral edge of the rotary hearth 10 shown in Fig. 8 are constituted by frame bodies 43, 44 formed by fireproof castable, and these frame bodies 43, 44 are respectively It is divided with predetermined gaps 51 and 52 at a plurality of locations in the circumferential direction.
  • the gaps 51 and 52 are filled with a ceramic sheet or a ceramic blanket (see Patent Document 2).
  • Patent Document 1 Japanese Patent Laid-Open No. 2002-310565
  • Patent Document 2 JP-A-2002-310564
  • the object of the present invention is to remove a foreign material such as a raw material powder or a refractory powder that has entered a gap as an expansion margin provided in a refractory for a rotary hearth furnace.
  • the object is to provide a rotary hearth that can be prepared and repaired.
  • a rotary hearth according to the present invention includes a hearth frame that is rotatably installed in the furnace of the rotary hearth furnace, an inner peripheral side portion and an outer periphery of the hearth frame.
  • a plurality of irregular refractories provided on the hearth frame between the inner peripheral corner refractories and the outer peripheral corner refractories disposed between the inner peripheral corner refractories and the outer peripheral corner refractories.
  • a plurality of the irregular refractories are arranged in at least one of the radial direction and the circumferential direction of the rotation of the hearth frame, and among the irregular refractories, the irregular refractories adjacent to each other are arranged.
  • the irregular refractory is disposed so that a lower expansion margin is provided therebetween, and is adjacent to the lower expansion margin and above the lower expansion margin of each irregular refractory.
  • the expansion allowance block has at least one of the expansion allowance block and the expansion allowance block straddling the lower expansion allowance in the recesses of the adjoining irregular shape refractories among the irregular shape refractories. It is detachably mounted so as to secure an upper expansion margin between the inner peripheral surface of the concave portion of the irregular refractory.
  • FIG. 1 is a partial vertical sectional view showing a hearth structure of a rotary hearth furnace according to an embodiment of the present invention.
  • FIG. 2 is a partial detailed cross-sectional view showing an enlarged portion A of FIG.
  • FIG. 3 is a partial plan view of a part of the rotary hearth 10 of FIG.
  • FIG. 4 is a partial detailed cross-sectional view showing an enlarged view B-B in FIG.
  • FIG. 5 is a construction procedure diagram in which a partial surface layer of the hearth according to the embodiment of the present invention is viewed in cross section.
  • FIG. 6 is a horizontal sectional view schematically showing a rotary hearth furnace for producing reduced iron according to a conventional example.
  • FIG. 7 is a vertical sectional view showing a hearth structure of a rotary hearth furnace for producing reduced iron according to a conventional example.
  • FIG. 8 is a partial plan view of a hearth of a rotary hearth furnace according to a conventional example.
  • FIG. 1 is a partial vertical sectional view showing a hearth structure of a rotary hearth furnace according to an embodiment of the present invention
  • FIG. 2 is a partial detailed sectional view showing an enlarged portion A of FIG. 1
  • FIG. 4 is a partial plan view of a part of the rotary hearth 10 in a plan view
  • FIG. 4 is an enlarged view of the arrow BB in FIG. It is a detailed sectional view.
  • a rotary hearth furnace 1 includes an inner peripheral wall 2 and an outer peripheral wall 3, and a rotary furnace provided between the inner peripheral wall 2 and the outer peripheral wall 3. With floor 10.
  • This rotary hearth 10 has a refractory structure. Specifically, the hearth frame 4 that forms the framework of the rotary hearth 10, the plurality of heat-insulating castables 5, the plurality of heat-insulating bricks 6a, and the plurality of refractory bricks 6b provided on the hearth frame 4 in order from the bottom. , And a plurality of irregular-shaped refractories 7 and corner metal refractories 8, 9 made of precast blocks.
  • the hearth frame 4 is disposed so as to be rotatable around a vertical axis in the furnace.
  • the corner refractories 8 and 9 are made of a precast refractory.
  • the corner refractories 8 and 9 are arranged on the hearth frame 4 at positions on the inner peripheral wall 2 side and on the outer peripheral wall 3 side. Each is arranged.
  • the above-mentioned amorphous refractory 7 is disposed in a region sandwiched between the corner refractories 8 and 9.
  • the amorphous refractory 7 constitutes a surface portion of the rotary hearth 10, and is constituted by a castable refractory.
  • a plurality of these irregular-shaped refractories 7 are arranged in both the radial direction and the circumferential direction of the rotation, and the first expansion block 11 and the second expansion block 12 are interposed between the irregular refractories 7. Is placed.
  • These blocks 7, 11 and 12 may be precast fireproof blocks.
  • the amorphous refractory 7 is arranged in two rows of the radially inner side and the radially outer side, and the amorphous refractory adjacent to each other in the radial direction.
  • a third expansion allowance (lower radial expansion allowance) 13 as shown in FIG. 2 is secured between them.
  • the third expansion allowance 13 is constituted by a groove-shaped lower gap 13a in the circumferential direction of the rotation formed between the irregular refractories, and the irregular refractory. It is located near the center of the hearth in the radial direction of the lower layer of object 7.
  • the width dimension S3 of the groove-like lower gap 13a is, for example, 12 mm.
  • the first recess 17a is formed, and the first expansion block 11 is detachably mounted in the first recess 17a.
  • the first expansion block 11 is in the circumferential direction.
  • the first inflating allowance block 11 is divided into a plurality of first recesses that straddle the lower gap 13a and are adjacent to the first inflating allowance block 11 in the radial direction and outside force respectively.
  • the groove-like upper gap 11a and the lower gap l ib are arranged between the inner peripheral surface of 17a.
  • Each of the groove-like gaps 11a and l ib has, for example, a shape with a width dimension S1 of 6 mm and a depth dimension hi of 65 mm. Further, the width dimension of the first expansion allowance block 11, in other words, the radial distance L1 between the upper gaps 11a and ib is, for example, 150 mm.
  • One groove-like lower gap 13a forming the third expansion margin 13 is directly below the first expansion expansion block 11, that is, below the amorphous refractory 7 in the range of the distance L1 in the radial direction. It is preferably arranged so as to fit. Further, one of the groove-like gaps 11a and l ib may be omitted, and thermal expansion may be absorbed only by the other.
  • This structure makes it possible to prevent intrusion of powder foreign matter into the groove-like lower gap 13a constituting the third expansion margin 13, and facilitates inspection of the lower gap 13a as will be described later. To This inspection is performed by removing the first expansion allowance block 11 as necessary.
  • the groove-like upper gaps 11a, l ib forming the first expansion allowance block 11 and the groove-like lower gap 13a forming the third expansion allowance 13 do not overlap in the vertical direction. It is important to place it at the position. If the lower gaps 11a, l ib and the upper gap 13a overlap in the vertical direction, the groove depth at that position becomes deeper in the circumferential direction and the fireproof function is reduced. When a foreign powder enters, there is a limit to the removal of this foreign powder.
  • the refractory structure having the first expansion allowance block 11 and the third expansion allowance 13 as described above absorbs the thermal expansion in the radial direction of the hearth refractory. Further, in this structure, the powder foreign matter enters the groove-like upper gaps 1 la and ib formed on the inside and outside in the radial direction of the first expansion allowance block 11, so that the refractory is thermally expanded in the radial direction. Even if the function to absorb is hindered, it can be repaired by removing only the first expansion block 11.
  • the groove depth hi of each of the groove-like gaps 11a and l ib is set within a range of 10 to 500 mm. Further, it is set within a range of 30 to LOOmm. More preferred.
  • the groove When the groove depth hi of the groove-like gaps 11a and l ib is less than 10 mm, the groove-like gaps 11a and l ib cannot exert the function as an allowance for expansion.
  • the groove depth h1 of the groove-like gaps 11a, l ib is less than 30 mm, it is difficult for these groove-like gaps 11a, l ib to expand and perform their functions.
  • the groove depth hi of the groove-like gap exceeds 100 mm, it is difficult to suck and remove the powder foreign matter that has entered the groove-like gaps 11a and ib. Suction removal is almost impossible.
  • the distance L1 between the two groove-like gaps 11a and l ib forming the first expansion allowance block 11 may be determined mainly from the viewpoint of facilitating inspection and repair.
  • the distance L1 is preferably set within a range of 10 to 1000 mm, and more preferably set within a range of 100 to 200 mm. If the distance L1 between the two groove-like gaps 11a and l ib is less than 100 mm, the groove-like gap is too close and easily damaged and difficult to inspect. If it is less than 10 mm, almost no inspection is possible. is there.
  • the groove width SI of the two groove-like gaps 11a, l ib forming the first expansion allowance block 11 is the thermal properties of the refractory used, the operating temperature, and the first expansion allowance block 11 It may be determined based on the number of installations. In general, it is preferably set within a range of 3 to 25 mm. This is because if the groove width SI of the groove-like gaps 11a and l ib is less than 3 mm, the function as an expansion margin cannot be exerted, and if it exceeds 25 mm, the fireproof function on the hearth structure is hindered.
  • the groove width S3 of the groove-like gap 13a that forms the third expansion margin 13 may be determined based on the thermal properties of the refractory used, the operating temperature, and the number of the expansion margins 13 installed. In general, it is preferably set within a range of 3 to 25 mm. If the groove width S3 of the groove-like gap 13a is less than 3 mm, the function as an expansion margin cannot be exhibited as in the case of the groove-like gaps 11a and l ib forming the first expansion allowance block 11. If it exceeds 25mm, the fireproof function on the hearth structure will be hindered.
  • the position of the first expansion allowance block 11 is not limited to the vicinity of the center of the hearth. If this position can absorb the thermal expansion of the refractory in the radial direction, the center of the hearth For example, a position between the corner refractories 8 and 9 and the adjacent amorphous refractory 7 may be used.
  • the number of columns of the first expansion allowance block 11 is not limited to one. If the number of the first expansion allowance block 11 is singular, if the thermal expansion in the radial direction of the refractory cannot be sufficiently absorbed, the first expansion block 11 is provided at a plurality of locations in the radial direction, for example, at a plurality of locations spaced by 1500 mm. 1 An expansion allowance block 11 may be provided. Such distributed arrangement of the expansion allowance blocks across multiple rows according to the degree of thermal expansion in the radial direction of the hearth refractory enables more effective absorption of the thermal expansion in the radial direction of the refractory. .
  • the arrangement in the circumferential direction of the irregular refractory 7 will be described.
  • a plurality of these irregular-shaped refractories 7 are arranged in the circumferential direction as shown in FIG. 3, and a second refractory 7 as shown in FIG. 4 is interposed between the irregular-shaped refractories adjacent to each other in the circumferential direction.
  • Expansion margin (diameter downward expansion margin) 14 is secured.
  • the second expansion margin 14 is constituted by a lower gap 14a formed between the irregular refractories.
  • the lower gap 14a has a groove shape extending in the radial direction of the rotation and has a groove width S2.
  • the second expansion allowance block 12 extends linearly in the radial direction within the area between the corner refractories 8, 9, straddling the lower gap 14a, and A groove-shaped upper gap 12a and an upper gap 12b are secured between the second expanding and squeezing block 12 and the inner peripheral surface of the second recess 17b adjacent from the inner side and the outer side in the circumferential direction. Placed.
  • the groove-like gaps 12a and 12b are located at a distance L2 from each other in the radial direction.
  • the width S2 of each of the groove-like upper gaps 12a, 12b is, for example, 6 mm
  • the depth h2 is, for example, 65 mm
  • the distance L2 is an example For example, it is set to 150mm.
  • the groove 12a for forming the fourth expansion margin 14 is formed on both sides of the second expansion margin block 12 at a position where the second expansion margin block 12 is substantially equally divided at a pitch p in the circumferential direction.
  • This structure makes it possible to prevent intrusion of powder foreign matter into the groove-like lower gap 14a constituting the fourth expansion margin 14, and facilitates inspection of the lower gap 14a as will be described later. To This inspection can be performed by removing the second expansion allowance block 12 as necessary.
  • the groove depth h2 of the two groove-like gaps 12a, 12b on both sides of the second expansion allowance block 12 is within the range of 10 to 500 mm for the same reason as the first expansion allowance block 11. Furthermore, it is preferable to be set in the range of 30 to: LOOmm.
  • the groove width S2 and the distance L2 of the groove-like gaps 12a and 12b forming the second expansion allowance block 12 have the same viewpoint force as the first expansion allowance block 11 described above. It only has to be done.
  • the groove width S2 is preferably set within a range of 3 to 25 mm, and the interval L2 within a range of 10 to: LOOOmm. Further, the interval L2 is set within a range of 100 to 200 mm. More preferred ,.
  • the number of the second expansion allowance block 12 is appropriately determined depending on the size of the rotary hearth furnace 1, the thermal properties of the refractory used, and the operating temperature. In general, it is preferable that a plurality of second expansion allowance blocks 12 be arranged at a pitch p of 100 to 1 OOOOmm in the circumferential direction, preferably at a pitch p of 500 to 4000 mm. If the second expansion allowance block 12 is singular, for example, it becomes difficult to absorb the thermal expansion of the hearth refractory at the position opposite to the second expansion allowance block 12 (rotation symmetry side). It is.
  • the groove width S4 of the groove-like gap 14a forming the fourth expansion margin 14 is also determined based on the thermal properties of the refractory used, the operating temperature, and the number of installation formulas of the fourth expansion margin 14. However, for the same reason as the third expansion allowance 13, it is usually preferable to set within the range of 3 to 25 mm.
  • Each of the expansion margins may be constituted by the gaps as described above, and is sandwiched between the adjacent amorphous refractories 7 of the amorphous refractories 7 and has fire resistance.
  • You may include a lower refractory stretchable material that can stretch in the adjacent direction!
  • As the lower refractory stretch material for example, an inorganic fiber refractory is suitable.
  • An example of repair procedure for a rotary hearth that uses such a lower refractory expansion / contraction material is shown in Fig. 2, which is a perspective view of a part of the surface layer of the hearth in a cross section. This will be described in detail below with reference to FIG.
  • Step 1 The irregular refractory 7 in the area to be repaired in the hearth 10 is removed, thereby exposing the upper surface of the refractory brick 6b in the area. Oil paper 15 is spread on the exposed upper surface of the refractory brick 6b. This is to prevent a castable refractory for forming a split frame, which is poured onto the upper surface of the refractory brick 6b as described later, from entering the gaps between the refractory brick 6b and the corner refractory 8 and 9. is there.
  • Step 2 A fiber board 113 and a plurality of fiber boards 114 are arranged on the oil paper 15.
  • the fiber board 113 constitutes the third expansion margin, has a width S3, extends in the circumferential direction, and is disposed at a corresponding radial position.
  • Each of the fiber boards 114 constitutes a fourth expansion margin, has a width S4, extends in the radial direction, and is disposed at a corresponding circumferential position.
  • Step 3 A plurality of molds 16 a are disposed on the fiber board 113 and a plurality of molds 16 b are disposed on the fiber board 114.
  • the mold 16a includes a fiber plate 11 la constituting the first expansion allowance block 11 and the first expansion allowances on both sides thereof when the irregular refractory 7 is formed by pouring a castable refractory. , 11 lb to secure the space for placement.
  • the mold 16b is for securing a space for arranging the second expansion allowance block 12 and the fiber boards 112a and 112b constituting the second expansion allowances on both sides thereof.
  • Step S4 The amorphous refractory 7 having a predetermined thickness is formed in the hearth space on the oil paper 15 in a region other than the molds 16a and 16b and the fiber boards 113 and 114.
  • This molding is performed, for example, by pouring a castable refractory into the region, firing and drying the castable refractory. Thereafter, the molds 16a and 16b are removed. By this removal, a first recess 17a which is a groove space extending in the circumferential direction and a second recess 17b which is a groove space extending in the radial direction are obtained.
  • the fiber plates 111a and 111b are arranged in the circumferential direction along both side surfaces of the first recess 17a, and the fiber plates 112a and 112b are arranged in the radial direction along both side surfaces of the second recess 17b.
  • Step S5 A first inflatable spar block 11 and a second inflatable spar block 12 are formed by pouring castable refractory into the recesses 17a and 17b to a predetermined thickness. Finally, the entire construction area is heated and dried to complete the construction.
  • each fiber board examples include ceramic fibers such as alumina fibers and inorganic fibers such as carbon fibers. In addition to such fiberboard, blankets and felts can also be used.
  • each expansion allowance is constituted by the lower refractory stretchable material as described above enhances work efficiency. This is because the amount of powder generated by misalignment or deterioration of the hearth refractory enters between the irregular refractories 7 is reduced, and the repair interval of the refractory structure is extended accordingly.
  • first expansion allowance blocks 11 are arranged in the circumferential direction in one row in the radial direction, These first expansion allowance blocks 11 have two groove-like gaps 11a and l ib extending in the circumferential direction. It is sandwiched between.
  • the corner refractories 8 and 9 are pressed. Even if the one refractory 8 or 9 is damaged, the parts that are damaged inside the corner refractories 8 and 9 are the first expansion allowance block 11 in the shaded area and the shaded area. Only the irregular refractories 7a and 7b sandwiching the first expansion block 11 are provided. Therefore, it is only necessary to remove and repair only these irregular shaped refractories 7a and 7b and replace the damaged corner refractories. This allows for savings in repair materials and a significant reduction in construction effort.
  • the procedure is the same as that described above even when it is confirmed that powder foreign matter has entered the groove-like gaps 12a and 12b on both sides of the second expansion allowance block 12 in the shaded area. . That is, for the same reason as described above, the powder foreign matter in the groove-like gaps 12a and 12b in the shaded area can be removed by suction.
  • the second expansion allowance block 12 may be removed. After the removal, it is sufficient to repair only the expansion allowance block 12 in the shaded area after removing the powder foreign matter that has entered the groove-like gaps 12a and 12b.
  • a plurality of amorphous refractories and a plurality of expansion allowances are provided on the hearth frame between the inner corner refractory and the outer corner refractory.
  • a block is provided.
  • a plurality of the irregular refractories are arranged in at least one of the radial direction and the circumferential direction of rotation of the hearth frame, and among the irregular refractories, the irregular refractories adjacent to each other are arranged.
  • the irregular-shaped refractory is arranged so that a lower expansion margin is provided between the upper and lower expansion margins of each irregular refractory and with respect to the lower expansion margin.
  • a concave portion opened upward is formed in the adjacent portion.
  • the expansion allowance block is formed in a recess of adjacent irregular refractories among the irregular refractories, and the expansion allowance block straddles the lower expansion allowance and at least one of the expansion allowance blocks.
  • the refractory is placed so as to be attachable and detachable so as to ensure an upward expansion margin with the inner peripheral surface of the concave portion of the regular refractory.
  • a plurality of the amorphous refractories are arranged at least in the radial direction of the rotation, and the radial refractories are adjacent to each other in the radial direction among the irregular refractories.
  • the irregular refractory is arranged so that a lower expansion margin is provided, and the concave portion is arranged in the radial direction with respect to the radial lower expansion margin of each irregular refractory.
  • a first recess formed in an adjacent portion, wherein the expansion allowance block is disposed in the first recess of the amorphous refractory adjacent to each other in the radial direction in the amorphous refractory.
  • the first recess of at least one amorphous refractory that straddles the lower expansion margin In the case of including a first expansion allowance block that is detachably mounted so as to secure the radially upward expansion allowance between the inner peripheral surface of the non-circular refractory in the radial direction. Inhibition of expansion is prevented.
  • a plurality of the irregular refractories are arranged at least in the circumferential direction of the rotation, and among the irregular refractories, between the irregular refractories adjacent to each other in the circumferential direction,
  • the irregular refractory is arranged so that a side expansion margin is provided, and the concave portion is formed in a portion adjacent to the circumferential direction with respect to the lower expansion margin in the circumferential direction as the concave portion.
  • the expansion allowance block extends across the lower expansion allowance in the circumferential direction in the second recesses of the irregular refractories adjacent to each other in the circumferential direction among the irregular refractories.
  • a plurality of second expansion allowance blocks each detachably mounted so as to secure an upper expansion allowance in the circumferential direction between the inner peripheral surface of the second recess of the at least one irregular refractory.
  • a plurality of the irregular refractories are arranged in the radial direction in addition to the circumferential direction of the rotation, and among the irregular refractories, between the irregular refractories adjacent to each other in the radial direction.
  • the irregular refractory is disposed so that a lower expansion margin in the radial direction is provided in the radial direction, and the lower expansion of the irregular refractory in the radial direction is included as the concave portion in addition to the second concave portion.
  • a first recessed portion formed in a portion adjacent to the radial direction with respect to the margin, wherein the expansion squeeze block is divided in the circumferential direction of the irregular refractory in addition to the second expansion squeeze block
  • the regular refractory If it is detachably mounted so as to secure an upper expansion margin in the radial direction across the expansion margin and between the inner peripheral surface of the concave portion of at least one irregular refractory, the radial direction and In both circumferential directions, the thermal expansion of the amorphous refractory is prevented from being inhibited.
  • the lower expansion margin includes a lower gap formed between adjacent amorphous refractories among the irregular refractories, and has a depth of 30 mm or more and 1 OO mm or less. If it has a size, even if foreign matter enters the lower gap, the foreign matter is absorbed. It is relatively easy to pull and remove, and even if the suction removal becomes impossible, the size of the expansion allowance block to be removed can be minimized.
  • the upper expansion margin includes an upper gap
  • the upper gap has a depth dimension of 30 mm or more and 100 mm or less, even if a foreign object enters the upper gap, the removal is removed. Can be easily performed.
  • the lower expansion margin is sandwiched between adjacent amorphous refractories among the irregular refractories, and has a fire resistance and can expand and contract in the adjacent direction.
  • a material including an elastic material or the upper expansion margin is sandwiched between the expansion expansion block and an inner peripheral surface of at least one concave portion adjacent to the expansion margin block, and has fire resistance and expands and contracts in the adjacent direction.

Abstract

La présente invention concerne une sole tournante dans laquelle un corps étranger, par exemple une poudre de matériau ou une poudre réfractaire, qui entre dans un espace, servant de tolérance de dilation, dans le matériau réfractaire de la sole tournante peut se retirer facilement. De plus, la sole tournante peut se réparer facilement. La sole tournante comprend des matériaux réfractaires d'angle (8, 9) disposés sur les côtés circonférentiels internes et externes, un matériau réfractaire monolithique (7) et des blocs de tolérance de dilatation (11, 12) retenus entre les matériaux réfractaires d'angle (8, 9) afin de composer la surface de la sole. Une tolérance de dilatation inférieure est disposée entre des matériaux réfractaires monolithiques (7) adjacents, et des évidements (17a, 17b) s'ouvrant vers le haut sont formés dans la partie supérieure de chaque matériau réfractaire monolithique (7) adjacent à la tolérance de dilatation inférieure. Les blocs de tolérance de dilatation (11, 12) sont disposés de manière amovibles dans les évidements correspondants afin de chevaucher la tolérance de dilatation inférieure, et les tolérances de dilatation supérieures (11a, 11b, 12a, 12b) sont placées entre les blocs de tolérance de dilatation (11, 12) et la surface circonférentielle interne de l'évidement dans au moins un matériau réfractaire monolithique.
PCT/JP2007/054005 2006-03-03 2007-03-02 Sole tournante WO2007100076A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006058266A JP4069138B2 (ja) 2006-03-03 2006-03-03 回転炉床
JP2006-058266 2006-03-03

Publications (1)

Publication Number Publication Date
WO2007100076A1 true WO2007100076A1 (fr) 2007-09-07

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Application Number Title Priority Date Filing Date
PCT/JP2007/054005 WO2007100076A1 (fr) 2006-03-03 2007-03-02 Sole tournante

Country Status (2)

Country Link
JP (1) JP4069138B2 (fr)
WO (1) WO2007100076A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105907909A (zh) * 2016-06-08 2016-08-31 江苏省冶金设计院有限公司 一种双环转底炉

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5335488B2 (ja) * 2009-03-05 2013-11-06 株式会社神戸製鋼所 回転炉床炉の炉床構造

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002310565A (ja) * 2001-04-06 2002-10-23 Daido Steel Co Ltd 回転炉床炉の炉床構造

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002310565A (ja) * 2001-04-06 2002-10-23 Daido Steel Co Ltd 回転炉床炉の炉床構造

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105907909A (zh) * 2016-06-08 2016-08-31 江苏省冶金设计院有限公司 一种双环转底炉

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