JP2009167508A - Method for constructing molten iron runner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for constructing a molten iron runner as the flowing passage of the molten iron discharged from a blast furnace, in a short period. <P>SOLUTION: In the method for constituting the molten iron runner as the flowing passage of the molten iron discharged from the blast furnace; a side plate unit executing an eternal stretching material 6a on the side plate 8 and the side part shape steel 10 of the molten iron runner, and a bottom part unit composed of the bottom plate 9 and the bottom part shape steel 11, are separately manufactured and further, after joining the side part unit and the bottom part unit, the eternal stretching material 6c is worked on the bottom part unit, and the eternal stretching material for reinforcing and the runner material for forming the flowing passage of the molten iron, are worked by laying the obtained constituting body on a runner-receiving beam. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for constructing hot metal that becomes a flow path of hot metal discharged from a blast furnace.

  As shown in FIG. 7, the hot metal discharged from the blast furnace and the hot metal that forms the flow path of the hot metal are one set of main metal, hot metal, and noro iron, and a plurality of sets are arranged for one blast furnace. . In the operation of the blast furnace 1, the hot metal and hot metal discharged from the blast furnace 1 flow down the main metal 2, and the hot metal and hot metal are separated by the skinmer 5. The separated hot metal flows into the hot metal 4, while the hot metal flows into the hot metal 3.

  FIG. 8 shows a cross-sectional view of the hot metal 3 taken along the line AA. The hot metal 3 is arranged with refractories 6a, 6b, 6c (hereinafter referred to as permanent tension materials) called permanent tension outside the refractory material 7 (hereinafter referred to as metal plating) that forms the flow path of the molten metal, and these These refractories are reinforced by the side plate 8 and the side section steel 10 and the bottom plate 9 and the bottom section steel 11. Hereinafter, the side plate 8, the side section steel 10, the bottom plate 9, and the bottom section steel 11 are collectively referred to as pig iron skin.

  When the hot metal flows, the hot metal 3 is heated by the retained heat of the hot metal (about 1500 ° C.), and the temperature of the side plate 8 and the bottom plate 9 reaches 200 to 300 ° C. Since the length of the hot metal 3 is about 10 to 25 m, the side plate 8 and the bottom plate 9 expand about 40 to 100 mm. However, when the hot metal 3 is installed on the casting floor, it is installed in consideration of such expansion, so there is no particular problem in normal operation.

  However, it sometimes occurs that the temperature of the molten iron skin becomes extremely high due to abnormal rise in the temperature of the hot metal or abnormal wear of the brazing material 7 or the permanent upholstery material 8. In such a case, the pig iron skin expands significantly, while the pig iron skin is restrained by the fixture for installing the hot metal 3, so that the pig iron skin undergoes creep deformation. As a result, there is a possibility that cracks and gaps are generated in the pig iron skin, the brazing material 7, and the permanent upholstery materials 6a, 6b, 6c, and the hot metal leaks out (so-called leakage). Therefore, it is necessary to promptly update the hot metal in which the pig iron skin has undergone creep deformation.

  In recent years, the life of blast furnaces has been remarkably improved, and blast furnace refurbishment work is performed about once every several decades. On the other hand, since the hot metal in which the pig iron skin has undergone creep deformation must be renewed promptly, the renewal must be performed while continuing the operation of the blast furnace. At that time, the hot metal that has undergone creep deformation is cooled to room temperature, and then the hot metal is disassembled and removed to construct a new hot metal.

During the hot metal renewal construction, the hot metal and hot metal are discharged from the blast furnace using other hot metal, which increases the heat load of the fireproof material used (ie, hot metal and permanent upholstery). To do. Therefore, in general, the hot metal renewal work period is limited to about 25 days.
Patent Documents 1 and 2 disclose the structure of pig iron skin. When constructing hot metal by applying these techniques, the refractory is constructed after the entire pig iron skin is prepared in advance. For this reason, it is unavoidable to perform a difficult work of constructing a permanent tension member with a constant thickness on the vertical side wall, and the construction period of the hot metal renewal work is unavoidable.

In other words, the techniques disclosed in Patent Documents 1 and 2 can be applied to a long-term renewal work that renews the hot metal in accordance with the renovation work of the blast furnace. It is difficult to apply when updating is performed in a short period of time.
Japanese Patent Laid-Open No. 2003-293017 Japanese Patent No. 3709172

  It is an object of the present invention to provide a method for constructing hot metal, which becomes a flow path of hot metal discharged from a blast furnace, in a short period of time, and in particular, renewing the hot metal in a short period of time while continuing the operation of the blast furnace. It aims at providing the construction method of the hot metal applicable to a case.

  The present invention relates to a method for constructing hot metal that becomes a flow path of hot metal discharged from a blast furnace, a side unit in which a permanent tension member is applied to a side plate and a side shape steel of the hot metal, and a bottom portion made of a bottom plate and a bottom shape steel. Each unit is individually manufactured, and after the side unit is joined to the bottom unit, a permanent tension member is applied to the bottom unit, and the obtained iron refractory structure is placed on the eaves receiving beam for reinforcement. This is a hot metal construction method in which a permanent tension material and a brazing material that forms a flow path for hot metal are constructed.

  According to the present invention, since the hot metal can be constructed in a short period of time, the present invention can be applied without any trouble when the hot metal is updated while the operation of the blast furnace is continued.

  FIG. 1 is a cross-sectional view schematically showing an example of a side unit and a bottom unit used when applying the present invention to update hot metal. FIG. 1A is a sectional view showing a member composed of a side plate 8 and a side section steel 10, and FIG. 1B schematically shows an example of a side unit in which a permanent tension member 6a is applied to the member. FIG. FIG. 1 (c) is a cross-sectional view showing a bottom unit composed of a bottom plate 9 and a bottom section steel 11.

  The side unit shown in FIG. 1 (b) and the bottom unit shown in FIG. 1 (c) are individually manufactured. After the side unit and the bottom unit are joined as shown in FIG. 2, as shown in FIG. Permanent upholstery 6c is applied to the bottom unit. In this way, by separately manufacturing the side unit and the bottom unit, the side unit can be held horizontally and the permanent tension member 6a can be applied, and the thickness of the permanent tension member 6a can be easily adjusted. Can be performed. In addition, since the permanent tension member 6c is applied while the bottom unit is also held horizontally, it is possible to easily adjust the thickness, cure the joint, and the like. The permanent upholstery materials 6a and 6c are both constructed by pouring construction with a mold only at the end, and then the mold is removed.

As described above, prior to the hot metal renewal work, the structure shown in FIG. 3 (hereinafter referred to as an iron refractory structure) is prepared in advance in a dedicated workplace.
When the hot metal is renewed, the hot metal that has undergone creep deformation is cooled to room temperature, and then the hot metal is disassembled and removed from the hot metal receiving beam.
FIG. 4 is a cross-sectional view schematically showing an example of a hook receiving beam. The eaves receiving beam 15 is constructed by welding shaped steel 16 in a lattice shape, and is fixed by bolts 14 via a bracket 13 on a base beam 12 fixed to the floor surface. The bracket 13 is for adjusting the height of the eaves receiving beam 15, and the liner 17 is for improving the slidability of the upper surface of the eaves receiving beam 15. The saddle receiving beam 15 does not necessarily need to be renewed when no significant deformation or wear is observed.

  Next, as shown in FIG. 5, the iron refractory structure is placed on the saddle receiving beam 15, and the reinforcing permanent member 6b is applied to the inner side of the permanent member 6a of the side unit. The brazing material 7 that forms the flow path is constructed. Both the permanent upholstery material 6b and the brazing material 7 are installed by a casting method with a formwork, and then the formwork is removed. An example of the hot metal thus constructed is shown in FIG. 6 as a cross-sectional view. After that, the refractory (ie, permanent upholstery material, dredging material) is dehydrated and dried to be used in the operation of the blast furnace. In this way, the hot metal can be constructed in a short period of time.

  Therefore, it is possible to shorten the work period of the renewal work from the dismantling to the construction of the hot metal, and it is possible to renew the hot metal while continuing the operation of the blast furnace.

In the hot metal renewal, the side unit shown in FIG. 1 (b) and the bottom unit shown in FIG. 1 (c) were individually produced in a dedicated work place and joined as shown in FIG. Further, as shown in FIG. 3, a permanent tension member 6c was applied to the bottom unit to obtain an iron skin refractory structure. Moreover, the collar receiving beam 15 shown in FIG. 4 was produced.
Next, the hot metal to be renewed was cooled to room temperature, disassembled and removed from the iron receiving beam, and the iron receiving beam was also disassembled.

  Thereafter, the newly produced saddle receiving beam was fixed to the floor surface, and the iron-skin refractory structure was placed on the saddle receiving beam 15 as shown in FIG. Furthermore, as shown in FIG. 6, a reinforcing permanent material 6b was applied to the inside of the permanent material 6a of the side unit, and a metal material 7 was further formed to form a hot metal flow path. Next, the refractory (namely, permanent upholstery and firewood) was dehydrated and dried, and used for the operation of the blast furnace. The dimensions of the hot metal thus constructed were 2 m in width, 2 m in height, and 22 m in length, with a total of 45 tons of steel materials used and a total of 135 tons of refractories. This is an invention example.

On the other hand, in the past, side plates, side sections, bottom plates, and bottom sections were joined together to produce the entire pig iron skin, and after placing it on the gutter receiving beam, the refractory material (ie permanent tension members 6a, 6b, 6c) By constructing the brazing material 7), a hot metal having the same dimensions as the invention example was constructed. This is a conventional example.
The construction period of the renewal work from dismantling to construction of the hot metal was 24 days for the invention example, whereas it was 37 days for the conventional example. In other words, it was confirmed that by applying the present invention to update the hot metal, it is possible to greatly shorten the work period of the renewal work and to update the hot metal while continuing the operation of the blast furnace.

It is sectional drawing which shows typically the example of the side unit and bottom unit used when applying the present invention and performing hot metal renewal. It is sectional drawing which shows typically the example which joined the side part unit and bottom part unit which are shown in FIG. It is sectional drawing which shows typically the example which constructed the permanent tension material to the bottom part unit of the structure shown in FIG. It is sectional drawing which shows the example of a collar receiving beam typically. It is sectional drawing which shows typically the example which mounted the iron-skin refractory structure on the eaves receiving beam. It is sectional drawing which shows the example which constructed the permanent upholstery material and reinforcement material for reinforcement. It is a top view of the cast floor which shows the example of arrangement | positioning of a blast furnace and a firewood typically. It is sectional drawing of the hot metal shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Blast furnace 2 Main iron 3 Hot metal 4 Noro iron 5 Skinmer
6a Permanent upholstery
6b Permanent upholstery
6c Permanent upholstery 7 Fence 8 Side plate 9 Bottom plate
10 Side section
11 Bottom section
12 Foundation beam
13 Bracket
14 volts
15 樋
16 section steel
17 liner

Claims (1)

In the hot metal construction method for the hot metal flow path for the hot metal discharged from the blast furnace, the side unit and the bottom unit made of the bottom plate and the bottom shape steel are respectively provided with the side plate and the side shape steel of which the permanent tension material is applied. After individually producing and joining the side unit to the bottom unit, a permanent tension member is applied to the bottom unit, and the obtained iron refractory structure is placed on the eaves receiving beam for reinforcement. A method for constructing hot metal, comprising: constructing a permanent tension material and a brazing material forming a flow path for the hot metal.

Images