Classifications

• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B7/00—Blast furnaces
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B7/00—Blast furnaces
  • C21B7/04—Blast furnaces with special refractories
  • C21B7/06—Linings for furnaces
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B7/00—Blast furnaces
  • C21B7/02—Internal forms
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B1/00—Shaft or like vertical or substantially vertical furnaces
  • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
  • F27B1/12—Shells or casings; Supports therefor
  • F27B1/14—Arrangements of linings
• • 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
  • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
  • F27D1/1694—Breaking away the lining or removing parts thereof
• • 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

Definitions

• the present invention relates to a transport method of constructing a blast furnace body in advance in a place other than the blast furnace foundation, and transporting the blast furnace onto the foundation after dismantling of the existing furnace body.
• the present invention relates to a method for transporting a blast furnace bottom mantel that transports a furnace bottom mantel to a blast furnace foundation.
• the old blast furnace (old blast furnace) was divided into small pieces and removed from the blast furnace foundation, and then the strip-shaped iron skin was welded one by one on the foundation.
• a new blast furnace body was installed, and then a method of building bricks in the furnace, in other words, a new blast furnace was constructed from scratch.
• the conventional method requires a long time for refurbishment.i After installing the furnace body, it is necessary to work at a high place to install a cooling device such as a staple cooler or cooling pipe, which is a problem in terms of safety and security. There was also.
• the new blast furnace is divided into a plurality of u-shaped blocks at a different location (ground) in parallel with the old blast furnace industry.
• these blocks were carried in using a large-scale heavy-duty carriage such as the first, and the jack clean.
• the so-called block construction method is used, which is installed by lifting and installing them, and welding and joining the steel skin and piping etc. of the part where each block contacts (For example, see Japanese Patent Publication No. 47-1846, Japanese Patent Laid-Open No. 09-143521, Japanese Patent Laid-Open No. 10-102778).
• the blast furnace is divided into a furnace bottom, morning glory, furnace abdomen, furnace chest, furnace bottom, etc., and each of the divided parts is a part around the blast furnace.
• a technique is disclosed in which the platform is moved and stacked sequentially using a moving scaffold each time, and the whole is combined to form a single unit to shorten the construction period of the blast furnace.
• the furnace body in dismantling or rebuilding an existing blast furnace, (a) the furnace body is divided into several ring-shaped blocks from the top of the furnace to the bottom of the furnace. (B) Of the above ring-shaped blocks, except for the bottom furnace bottom block, the blocks other than the lowest furnace bottom block are each equipped with a means to prevent warping and distortion of the brick stack and roundness. (C) On the other hand, the bottom block of the furnace is constructed by building bricks on the bottom plate installed at the lower end of the bottom block. (D) The ring-shaped block excluding the bottom block is horizontal. (E).
• the furnace bottom block transports the blast furnace foundation level to the foundation by transverse feed after being transferred to the blast furnace foundation by feed and then lifted up sequentially from the top of the furnace by the lift-up method.
• step short repair and construction method of a blast furnace consisting of are disclosed.
• JP-A-10-102778 an existing furnace body of a blast furnace is divided into a plurality of ring blocks from the top of the furnace to the bottom of the furnace, and a similar ring block is produced. Assemble the ring block on the blast furnace foundation In the blast furnace body construction method to be lifted up, a lifting device that raises and lowers the ring block of the furnace body is installed at a place other than the blast furnace foundation, and the ring block is loaded so that the load level matches the blast furnace foundation level.
• the ring block is lifted down to a level where it can be lifted and transported to the cradle by a transport cart.
• the ring block is constructed at a low level that allows the transport cart to be lifted at a minimum and suspended by the transport cart.
• Transport to the changer support the ring block with the suspension changer, lift it up to a level where it can move to the blast furnace foundation level, and adjust the load level
• each divided block is constructed on a scaffold with the same height as the completed assembly, and after completion, it is moved to each part using a moving scaffold and completed.
• the height force of the blast furnace body is about OOm.
• This furnace body is divided, and scaffolds are constructed for each divided height, and a block is constructed on this scaffold.
• the ring-shaped furnace block is moved to the blast furnace base, lifted up, and each ring is joined. Move the furnace bottom block and place it on the furnace bottom block. At this time, the bottom block is' furnace Assemble bricks on the bottom plate.
• the bottom of the blast furnace has a diameter of 10-20m, and when the bricks are stacked on the bottom plate, deformation of the bottom plate is the most important issue. No measures are disclosed. Therefore, although there was the idea of placing bricks on the bottom block, it was a matter of concern among those skilled in the art how to specifically solve the above problems, and the actual situation was not realized.
• JP-A-10-102778 a lifting device for raising and lowering the ring block of the furnace body is installed in a place other than the blast furnace foundation, and the load level is adjusted so that the ring block matches the blast furnace foundation level.
• blast furnace block construction is an indispensable technology for shortening the process period.
• the weight of each block increases, and advanced transport technology is required. There is no mention of transport technology in the literature. Disclosure of the invention
• the present invention has been completed as a result of intensive studies by the inventor in order to solve the above-mentioned problems.
• the gist of the present invention is as follows.
• a laying beam with a thickness H of 480 mm or more and 1000 mm or less is installed on the lower surface of the furnace bottom mantel, and a balance beam with a thickness A of 700 fflin or more and ⁇ or less is installed on the lower surface of the laying beam.
• a plurality of dolly lines are formed by connecting the dolly lines in the longitudinal direction, and the dolly lines are drawn in parallel into a gap formed between the balance beam and the ground surface.
• a laser transmitter is installed at an arbitrary position on the brick upper surface constructed in the furnace bottom mantel.
• a plurality of laser receivers are arranged on a straight line at an arbitrary position on the brick upper surface.
• Figure 1 is a diagram illustrating the outline of the blast furnace.
• FIG. 2 is a diagram showing an outline of construction of a furnace bottom mantel according to the present invention.
• FIG. 3 is a diagram for explaining an outline of an experimental mini model.
• Fig. 4 (a) is a diagram schematically showing the planar structure of the spread beam.
• Figure 4 (b) shows the cross-sectional structure of the spread beam.
• Figure 5 shows the relationship between the thickness of the spread beam and the amount of deflection.
• FIG. 6 is a diagram schematically showing the cross-sectional structure of the balance beam.
• Fig. 7 shows the relationship between the balance beam thickness and the amount of deflection.
• Fig. 8 (a) is a diagram showing the bottom mantel constructed with bricks at the building site.
• Fig. 8 (b) is a diagram showing the bottom mantel transported by dolly
• Fig. 8 (c) is a diagram showing the bottom mantel transported using the air caster.
• FIG. 9 (a) is a diagram showing the arrangement of the dolly according to the present invention.
• FIG. 9 (b) is a diagram showing the conventional arrangement.
• FIG. 10 (a) is a diagram showing an example of an installation mode of the reinforcing ring.
• Fig. 10 (b) is an enlarged view of the reinforcing ring.
• Fig. 11 (a) is a diagram showing an example of the installation state of the stay material.
• Figure U (b) is an enlarged view of the stay material.
• FIG. 12 is a diagram showing an example of the arrangement of the dark space.
• FIG. 13 (a) is a diagram showing an example of an arrangement mode of one laser transmitter and one laser receiver.
• Fig. 13 (b) is a diagram showing the amount of stagnation on the top surface of the brick.
• Fig. 14 is a diagram showing an error caused by the inclination of the laser transmitter due to the bending of the brick upper surface.
• FIG. 15 (a) is a diagram showing another example of the arrangement of the laser transmitter and the laser-receiver.
• FIG. 15 (b) is a diagram showing another example of the arrangement of one laser transmitter and one laser receiver.
• FIG. 16 is a diagram showing a correction method for canceling an error caused by the tilt of the laser transmitter due to the bending of the brick upper surface.
• Fig. 17 is a diagram for explaining the technical significance of installing measuring equipment on the top surface of bricks constructed in the bottom mantel.
• the blast furnace demolition and refurbishment is performed by cutting the blast furnace body 2 horizontally, dividing it into multiple stages, and carrying it out of the blast furnace foundation 5 to the outside of the blast furnace foundation.
• the newly established furnace body 2 is constructed with a preset number of blocks at a place other than the blast furnace foundation (ground assembly site).
• Figure 2 shows the bottom mantle 1 ⁇ which is 'blocked' and built at the ground It is a figure which shows the state immediately after conveying.
• the balance beam 16 is erected on the ground surface, and the spread beam 12 is placed on the upper surface of the balance beam 16.
• the bottom mantel 1 will be constructed on the top surface of the spread beam 12 constructed in this way.
• the iron shell 7 is erected on the furnace bottom plate 6, the stave cooler 8 is stretched inside the iron shell 7, and the hearth flange 9 is connected to the upper surface of the furnace bottom plate 6 through the joint material 11. Install. Then, the carbon brick 10 is constructed on the upper surface of the hearth brick 9 through the joint material. In this state, the weight of the bottom mantel 1 is about 1000 tons or more. To construct this bottom mantel 1 on the balance beam 16 installed in the ground, make the balance beam 16 rigid. It is necessary to prevent the deformation of the bottom mantel.
• the jack 24 was installed at the bottom of the mini model furnace bottom mantel, the jack 'was activated, and it was installed between the carbon bricks. The gap between the joint and the stamp material 25 was observed. The results are shown in Table 1. .
• FIG. 2 is a diagram showing a mode in which the furnace body in which the bottom mantel is placed on the former spread beam is transported. On the blast furnace foundation, a bottom mantel and a spread beam will be installed. Therefore, it is necessary to give the floor beam 12 rigidity.
• the structure of the spread beam 12 is shown in Fig. 4 (a) and Fig. 4 (b).
• the laying beam 12 is formed by assembling H-beams in a cross-beam shape or a lattice shape, and pouring a refractory concrete 15 into it. It is expensive.
• Figure 5 shows the amount of stagnation of the spread beam constructed in this way.
• the thickness H of the laying beam is not more than 480 mm, the amount of sag obtained in the experiment exceeds 3 m ni / m, and it was found that the thickness H of the laying beam is 480 mm or more. Moreover, if the thickness H of the laying beam exceeds 1000 dragons, the weight will only increase and it will not be economical.
• the balance beam 16 is required to support the bottom mantel 1 and the laying beam 12 and to have rigidity to suppress the deflection of the top surface of the carbon brick in the bottom mantel to 3 mm / m or less.
• the thickness A of the balance beam must be 700 mm or more. If it is 700 mm or more, the force that can suppress the deflection of the top surface of the carbon brick to 3 nimZ m or less. There is a limit to the strength of the dolly for transporting the bottom mantel and balance beam including the balance beam.
• the height A is 2 200 mm or less.
• a large-scale heavy-duty carriage is used for transportation from the assembly ground to the side of the blast furnace foundation.
• a single dolly 17 is connected in the conveying direction (longitudinal direction) to form a plurality of dolly rows, and the formed dolly rows are arranged in parallel between the north beam 16 and the ground surface.
• the balance beam 16 is lifted by operating the dolly hydraulic pressure and transported to the side of the blast furnace base.
• Fig. 8 (a) shows the bottom mantel constructed with bricks at the building, and Fig. 8 (b) shows the bottom mantel to be transported by dolly.
• Fig. 9 (c) shows the bottom mantels transported using the air cylinder. The length of each Lie row arranged in parallel is shown in Fig. 9 (a).
• the load applied to the dolly can be absorbed in a balanced manner by reducing the length of the dolly row from the center to the end.
• the distance P between the two cylinders is set to 2.5 m by setting the distance between the F lines as 2.5 m or less as iJ of the row of dolls.
• the distance to support the balance beam 16 is less than 2.5 m. The By setting the support point of this balance beam to 2.5 m or less, the amount of stagnation of the non-beam can be minimized, and the portion protruding from the outer diameter of the bottom mantel can be minimized. '
• the balance beam 16 has a shape corresponding to the length of the dolly line to be pulled. By adopting such a shape, it is possible to evenly distribute the load applied to the dolly, and as a result, it is possible to reduce the amount of bending during conveyance.
• FIG. 10 (a) and FIG. 10 (b) are diagrams showing an outline of the reinforcing ring 19.
• the reinforcing ring 19 is arranged on the upper outer periphery of the furnace bottom mantel 1. If the pre-installed part of the brick into the bottom mantel is the hearth brick 9 and the carbon brick 10, there is a core part of the bottom mantel. Prevent deformation (falling inward).
• FIG. 11 (a) and FIG. 11 (b) are diagrams showing an outline of the stage material 21 installed on the inner surface of the furnace bottom mantel.
• Stay material 2 1. is arranged radially.
• the steel material 21 is placed near the top of the carbon bricks constructed in the furnace bottom mantel. This is because it is better to be as close to the top surface of the carboshi brick 10 as possible in order to prevent the stagnation of the top surface of the carbon brick as much as possible.
• the present invention can be applied to a furnace bottom mantel 1 whose weight has been increased by building bricks in advance in a place other than the foundation of the blast furnace. If the amount of stagnation on the upper surface of the bricks installed in the interior is 3 mm or less per lm of the mantel radius, the brick can be stably transported to the blast furnace foundation without causing joint breakage. This invention was completed based on new and useful technical knowledge that does not exist.
• the amount of stagnation on the top surface of the brick is measured using a predetermined measuring device. It is desirable to transport while measuring.
• FIG. 1 An example of the arrangement of the air cast 18 is shown in FIG.
• a laser transmitter 26 and a plurality of laser receivers 27 for receiving the laser 28 transmitted by the laser transmitter 26 are installed on the brick upper surface constructed in the mantle 1 at the bottom of the furnace. It is desirable to do.
• a transmitter such as a laser is installed at a fixed point as shown in Fig. 17, and a fixed reference point is set at one point of the fixed point. Generally, the vertical displacement at the measurement point is obtained by relative comparison with the reference point.
• a laser transmitter '26 is installed at an arbitrary position on the upper surface of the brick constructed in the furnace bottom mantel 1, and a plurality of laser receivers 27 are also installed at arbitrary positions on the upper surface of the flange. It is desirable to install.
• the amount of bending of the top surface of the brick can be measured.
• the laser transmitter 26 is not particularly limited, and a rotating laser shown in FIG. 13 (a) can be used. By using a rotating laser, the amount of vertical displacement that changes from moment to moment can be detected instantaneously.
• the laser receiver 27 is not particularly limited, and a displacement measuring device for a rotating laser can be used.
• each laser one receiver 27 it is desirable to transmit the laser one receiving position data in each laser one receiver 27 to an operator outside the furnace by wireless or wired communication means. For example, by connecting each laser receiver 27 and a computer (computer evening) installed outside the furnace by wireless or wired communication means, the vertical displacement in each laser receiver that changes momentarily by mantel transport The amount, that is, the amount of stagnation can be confirmed at any time.
• the detection of the amount of vertical displacement can remember the laser-reception position before the mantel transport, and changes from moment to moment
• the laser receiver 27 that can calculate the difference from the laser receiving position
• the laser receiver itself can be used, or it can be performed by a computer (computer) connected by wireless or wired communication means. Then, the difference may be calculated.
• the laser one transmitter 26 and the laser one receiver 27 are installed on the brick upper surface constructed on the furnace bottom mantel, so as shown in FIG.
• the laser transmitter 26 is tilted, and accordingly, the laser receiving position in each laser receiver 27, and thus the detected vertical displacement amount, includes an error.
• This error increases in proportion to the distance between the laser transmitter 26 and each laser receiver 27, as shown in FIG.
• FIG. 15 (a) and FIG. 15 (b) are diagrams showing other forms of arrangement examples of the laser transmitter 26 and the laser receiver 27. By arranging in this way, it is possible to perform correction to cancel an error caused by the inclination of the laser transmitter 26 caused by the stagnation of the brick upper surface.
• a plurality of laser receivers 27 are arranged on the same straight line, and a correction that cancels the error caused by the inclination of the laser transmitter 26 caused by the stagnation of the brick upper surface from the detected vertical displacement amount.
• the corrected vertical displacement is the true amount of stagnation.
• the laser 1 receiver A (measurement point A) at the end of the line placed on a straight line is always set to zero. Then, the value of the laser receiver B arranged at the extreme end on the opposite side is read, and the value of the receiver installed in the meantime is corrected by the installation distance L.
• the bottom mantel can be stably conveyed to the blast furnace foundation. Therefore, the present invention has high applicability in the steel industry.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Furnace Housings, Linings, Walls, And Ceilings (AREA)
• Blast Furnaces (AREA)
• Conveying And Assembling Of Building Elements In Situ (AREA)
• Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Priority Applications (3)

Applications Claiming Priority (4)

Publications (1)

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ID=37053483

Family Applications (1)

Country Status (7)

Cited By (1)

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Citations (4)

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• 2005
  • 2005-12-16 JP JP2005363618A patent/JP4822831B2/ja active Active
• 2006
  • 2006-03-27 KR KR1020077024652A patent/KR100949854B1/ko active IP Right Grant
  • 2006-03-27 EP EP06730932A patent/EP1865078B1/en not_active Expired - Fee Related
  • 2006-03-27 CN CN2006800109510A patent/CN101155934B/zh active Active
  • 2006-03-27 BR BRPI0609604-2A patent/BRPI0609604B1/pt active IP Right Grant
  • 2006-03-27 WO PCT/JP2006/306984 patent/WO2006104229A1/ja active Application Filing
  • 2006-03-28 TW TW095110707A patent/TWI325014B/zh not_active IP Right Cessation

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