JP2004225142A - Device for hermetically sealing and fixing furnace bottom part in blast furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for hermetically sealing and fixing a furnace bottom part in a blast furnace with which the blast furnace in which anchor bolts are disposed in the inside of the furnace body, is fixed to the blast furnace basis and this fixed portion is hermetically sealed. <P>SOLUTION: This hermetically sealing and fixing device comprizes the anchor bolts for fixing the furnace bottom part in the blast furnace by embedding into the blast furnace basis, an anchor frame disposed in the inside of the furnace body, an anchor bolt penetrating hole seal pipes disposed in the anchor bolt penetrating hole on the anchor frame, nuts fitted on the anchor frame and forming an engaged fixing part by engaging with the anchor bolts, engaged fixing part seal member for sealing by including the engaged fixing part, engaged fixing part refractory for holding heat resistance of the engaged fixing part by being disposed to the outside of the engaged fixing seal member and anchor seal member for hermetically sealing the anchor frame by being disposed on the outer periphery of the engaged fixing part refractory. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a device for fitting an anchor bolt and a nut inside a furnace body formed of a steel shell, sealing a fixing portion thereof, and fixing a blast furnace to a blast furnace foundation.
[0002]
[Prior art]
When constructing a new blast furnace or constructing it for rehabilitation, the bottom of the blast furnace is fixed to the blast furnace foundation using anchor bolts. Anchor bolts are embedded in the blast furnace foundation, and fix the blast furnace to the blast furnace foundation by fitting with nuts mounted on an anchor frame at the hearth. Generally, a portion where the anchor bolt and the nut are fitted (hereinafter, referred to as a fitting fixing portion) is disposed outside a furnace body formed of a steel shell (for example, see Patent Document 1).
[0003]
On the other hand, in the operation of the blast furnace, since the operation is performed with the furnace internal pressure increased, it is necessary to maintain the sealing performance of the furnace body. As shown in FIG. 2, in a blast furnace in which a fitting fixing portion where the anchor bolt 4 and the nut 5 are fitted is arranged outside the furnace body, various measures are taken to maintain the sealing performance of the furnace body. It is not necessary to pay particular attention to the sealing properties of the joints. FIG. 2 shows the vicinity (only one side) of the steel shell 1 at the furnace bottom.
[0004]
However, in a blast furnace constructed by increasing the inner volume of the furnace in accordance with the repair work, the fitting and fixing part may be arranged inside the furnace body. That is, since the anchor bolts 4 are buried in the blast furnace foundation 3, it is difficult to change the positions of the anchor bolts 4. On the other hand, in order to increase the furnace volume, the diameter of the furnace body must be increased. No. As a result, the fitting and fixing portion is arranged inside the furnace body formed of the steel shell 1.
[0005]
In a blast furnace in which the fitting and fixing portion is disposed inside the furnace body as described above, it is necessary to maintain the sealing property of the fitting and fixing portion together with the sealing performance of the furnace body in order to enable operation with increased furnace pressure. is there.
[0006]
[Patent Document 1]
JP-A-58-110607
[Problems to be solved by the invention]
An object of the present invention is to solve the above-mentioned problems and to provide a hermetic fixing device for fixing a blast furnace in which a fitting fixing portion of an anchor bolt and a nut is arranged inside a furnace body to a blast furnace base and sealing the blast furnace. And
[0008]
[Means for Solving the Problems]
The present invention provides an anchor bolt buried in a blast furnace foundation and fixing a furnace bottom of a blast furnace, an anchor frame disposed inside a furnace body, and an anchor bolt penetrating disposed in an anchor bolt through hole of the anchor frame. A hole sealing pipe, a nut mounted on the anchor frame and fitting with the anchor bolt to form a fitting fixing portion, a fitting fixing portion sealing member including the fitting fixing portion and hermetically sealing; A fitting fixing part refractory that is disposed outside the fitting fixing part seal member and maintains heat resistance of the fitting fixing part; and the anchor frame that is disposed on the outer periphery of the fitting fixing part refractory. A hermetic fixing device for a blast furnace furnace bottom, comprising: a hermetic anchor seal member.
[0009]
In a preferred embodiment, an upper bottom plate and a lower bottom plate for partitioning the furnace bottom are preferably provided on the upper surface and the lower surface of the anchor frame.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a cross-sectional view schematically showing an example of the hermetic fixing device of the present invention. FIG. 1 shows the vicinity (only one side) of the steel shell 1 at the furnace bottom.
The furnace body of the blast furnace is formed of a steel shell 1 and a refractory brick 2 is lined inside thereof. The furnace body to which the present invention is applied is not limited to a specific structure, and can be applied to a conventionally known blast furnace.
[0011]
Generally, the furnace bottom has a complicated structure. For example, as shown in FIG. 1, a cooling pipe 12 is provided below the furnace bottom to improve the durability of the furnace body, and an upper bottom plate 10 is provided above the cooling pipe 12 and provided below. The lower bottom plate 11 is provided to protect the cooling pipe 12 and improve the sealing performance of the furnace body.
In the present invention, the anchor frame 6 is disposed inside a furnace body having such a furnace bottom. The shape of the anchor frame 6 is not limited to a specific form, but it is necessary to join the steel frame 1 and avoid interference with the cooling pipe 12 provided at the furnace bottom.
[0012]
On the other hand, an anchor bolt 4 is buried in the blast furnace foundation 3, and a through hole 14 is provided in the anchor frame 6 at a position facing the anchor bolt 4. An anchor frame through-hole seal pipe 13 is provided to cover the hole. The anchor bolt 4 is inserted into the anchor frame through hole seal pipe 13 and further fitted to the nut 5. Thus, the anchor bolt 4 and the nut 5 are fitted to fix the furnace body to the blast furnace base 3. Therefore, the fitting fixing portion where the anchor bolt 4 and the nut 5 are fitted is disposed inside the furnace body.
[0013]
Next, a fitting / fixing portion sealing member 8 is provided so as to include the fitting / fixing portion, and the fitting / fixing portion is sealed. This structure for sealing is performed by welding 15 between the anchor frame 6 and the anchor frame through-hole sealing pipe 13 and welding between the fitting fixing part sealing member 8 and the anchor frame 6. In FIG. 1, the washer 16 of the nut 5 and the fitting fixed portion sealing member 8 are welded and joined 17, and the washer 17 and the anchor frame 6 are welded and joined 18.
[0014]
Note that the fitting and fixing portion sealing member 8 may have a size capable of containing the anchor bolt 4, the nut 5, and the washer 16, and may be configured to be directly joined to the anchor frame 6. Further, a refractory 9 (hereinafter, referred to as a fitting fixed portion refractory) is disposed outside the fitting fixed portion sealing member 8 (that is, on the opposite side of the fitting fixed portion) to maintain heat resistance of the fitting fixed portion. I do.
[0015]
In the present invention, the type of the refractory 9 at the fitting fixing portion is not limited to a specific material, and a conventionally known irregular refractory or a fixed brick is used. Also, the components thereof are appropriately set according to the material and thickness of the refractory brick 2 lined with the steel shell 1.
Further, an anchor seal member 7 is disposed on the outer periphery of the fitting fixed portion refractory 9 to seal the anchor frame 6. Note that the sealing of the anchor frame 6 refers to sealing the joint between the steel shell 1 and the anchor frame 6 and the through hole 13 provided in the anchor frame 6. As a result, a state is obtained in which the fitting fixed portion refractory 9 is filled between the anchor seal member 7 and the fitting fixed portion sealing member 8.
[0016]
As described above, the fitting and fixing portion is sealed by the double structure of the anchor sealing member 7 and the fitting and fixing portion sealing member 8, and the anchor frame 6 is sealed by the anchor sealing member 7. Can be held.
In the present invention, the shapes of the fitting fixing portion seal member 8 and the anchor seal member 7 are not limited to a specific form, but may be determined according to the dimensions of the anchor bolts 4 and the nuts 5 or the shapes of the iron shell 1 and the anchor frame 6. Set as appropriate.
[0017]
In the present invention, an upper bottom plate 10 and a lower bottom plate 11 are provided on the upper surface and the lower surface of the anchor frame 6 to partition the furnace bottom in order to improve the sealing performance of the furnace bottom of the blast furnace. This prevents gas in the furnace from entering. The conventional structure is a sealing structure of the upper bottom plate 10, and the gas in the furnace that has entered the upper bottom plate 10 passes through the blast furnace bottom and leaks to the outside of the blast furnace. In the present invention, the in-furnace gas that has penetrated the upper bottom plate 10 is prevented from leaking to the anchor frame 6 side at the blast furnace steel shell and the anchor frame through hole seal pipe 13, and the lower bottom plate 11 is used to prevent the furnace gas from flowing outside the blast furnace. Gas leakage is prevented.
[0018]
【Example】
When renovating the blast furnace, the blast furnace was constructed by increasing the diameter of the furnace body and increasing the inner volume of the furnace. At that time, the existing anchor bolt 4 was used. As the diameter of the furnace body is increased, the existing anchor bolts 4 are located inside the furnace body as shown in FIG. 1, but the through holes 14 for inserting the anchor bolts 4 are provided inside the furnace body. An anchor frame 6 having an anchor frame 6 is provided, a nut 5 is mounted on the anchor frame 6, and a through hole 14 of the anchor frame 6 forms an airtight structure. The bolt 4 was attached, and the anchor bolt 4 and the nut 5 were fitted.
[0019]
Further, a fitting / fixing portion sealing member 8 is provided to seal the fitting / fixing portion including the anchor bolts 4 and the nuts 5, and an anchor sealing member 7 is provided outside the sealing portion to seal the anchor frame 6. did. The fitting fixing portion refractory 9 was press-fitted between the fitting fixing portion seal member 8 and the anchor seal member 7. The bottom plate that separates the bottom of the blast furnace is provided with an upper bottom plate 10 and a lower bottom plate 11 made of iron plates at the upper and lower portions of the anchor frame 6, respectively, to form a furnace bottom. After arranging the cooling pipe 12 therebetween, the space was press-filled with a refractory.
[0020]
The joints were welded to form a closed structure to prevent gas leakage in the blast furnace. This is an invention example.
On the other hand, before the refurbishment, as shown in FIG. 2, the fitting and fixing part was arranged outside the furnace body. This is a conventional example.
Regarding the invention examples, while operating with the furnace pressure increased to 345 kPa, leakage of furnace gas from the furnace bottom was investigated. As a result, no gas leakage was observed.
[0021]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the fitting fixing part of an anchor bolt and a nut can fix the blast furnace arrange | positioned inside a furnace body to a blast furnace base, and can seal the fitting fixing part.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view schematically illustrating an example of a hermetic fixing device according to the present invention.
FIG. 2 is a cross-sectional view schematically showing an example of a conventional fixing device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 steel shell 2 refractory brick 3 blast furnace foundation 4 anchor bolt 5 nut 6 anchor frame 7 anchor seal member 8 fitting fixing portion sealing member 9 fitting fixing portion refractory 10 upper bottom plate 11 lower bottom plate 12 cooling pipe 13 anchor frame through hole seal Pipe 14 Through hole 15 Weld joint 16 Washer 17 Weld joint 18 Weld joint

Claims (2)

An anchor bolt buried in the blast furnace foundation to fix the furnace bottom of the blast furnace, an anchor frame disposed inside the furnace body, and an anchor bolt through hole seal pipe disposed in the anchor bolt through hole of the anchor frame. A nut mounted on the anchor frame to fit with the anchor bolt to form a fitting fixing portion, a fitting fixing portion sealing member that encloses and seals the fitting fixing portion, and the fitting fixing portion. A fitting-fixing-portion refractory provided outside the sealing member to maintain the heat resistance of the fitting-fixing portion; and an anchor seal provided around the fitting-fixing-portion refractory to seal the anchor frame. And a member for hermetically fixing a bottom portion of a blast furnace having a member. 2. The apparatus according to claim 1, wherein an upper bottom plate and a lower bottom plate that partition a furnace bottom are provided on an upper surface and a lower surface of the anchor frame, respectively. 3.

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