JPH0776675B2 - Ceramic fiber blanket Auxiliary studs for repair of laminated lining - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a repair auxiliary stud for repairing a ceramic fiber bun racket laminated lining.

[0002]

2. Description of the Related Art Lining with highly heat-insulating ceramic fibers is often used in various heat treatment apparatuses in industrial heating furnaces and petrochemical plants that use heavy oil, gas, etc. as fuel.

As a means for the above lining, a stud bolt 2 is welded to the inner surface of the iron shell 1 of the furnace, and a ceramic fiber blanket 3 is attached to the stud bolt 2 as shown in a partial cross section in FIG. 3 are inserted and laminated, the washer 4 is fitted to the end of the stud bolt 2, and the blanket 3 is pressed and fixed by screwing the nut 5.

The stud bolts 2, washers 4 and nuts 5 are made of special steel such as SUS304 and 310S. Since these members are located on the heating surface side in the furnace, they are oxidized and melted by heating. When they are melted and fallen off, the holding power of the blanket 3 of the first layer on the heating surface side is lost as shown in FIG. 5, resulting in sagging or even peeling.

In order to repair such a damaged portion, conventionally, the lining is peeled off to the iron skin 1, a new stud bolt is re-welded, and a ceramic fiber blanket is inserted and laminated in the same manner as when newly installed. It depends.

On the other hand, in order to prevent the melting of the end portion of the stud bolt 2 and the nut 5 as much as possible, the nut 5 portion is covered with the ceramic fiber 6 as shown in FIGS. 6 and 7, or the ceramic cap 7 is covered. By crowning.

[0007]

However, in order to re-weld the stud bolt 2 at the time of repair as in the former case, the lining must be peeled off over all the layers, and after that, a new stud bolt is welded. Since the ceramic fiber blanket has to be inserted and laminated again, not only is it necessary to spend a lot of time and labor on the repair work, but also the iron shell 1
Even if the lining on the side close to is damaged, it must be removed, which results in wasteful consumption of material and is extremely uneconomical.

Further, even if the end of the stud bolt 2 or the nut 5 is capped with the fiber 6 or the cap 7 to prevent the melting loss itself as in the latter case, it is merely covered so that the thermal damage can be prevented. The problem cannot be resolved, and it cannot be expected to be effective as it falls off during use.

In view of this, even if the tip portion of the stud bolt is melted and broken, only the damaged lining layer is peeled off and a new lining is laminated by using the melted stud bolt. It is an object of the present invention to provide an auxiliary stud for repairing a ceramic fiber blanket laminated lining capable of being repaired.

[0010]

As a means for solving the problems of the above-mentioned prior art, the present invention provides a plate having a required size, and prevents the stud bolt which is melted and damaged from being pulled out from this plate. The ceramic fiber blanket laminated lining repair is characterized in that the auxiliary stud bolt is fixed and a new ceramic fiber blanket is inserted and supported to repair the auxiliary stud bolt. To provide auxiliary studs for.

[0011]

[Function] The tip of the stud bolt is melted and lost, and the damaged lining of the damaged portion where the nut loses its ability to retain the lining is peeled off to the undamaged layer. As a result, the shaft portion of the stud bolt is exposed, and the stud bolt is fitted into the insertion hole of the plate of the auxiliary stud for repair. Since the plate is fixed to the stud bolt by fitting the insertion hole, the repair is completed by inserting and fixing a fiber as a new lining to the auxiliary stud bolt fixed to the plate.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 shows an example of a repairing auxiliary stud 8 used in the present invention, and FIG. 2 shows its usage state as a sectional view.

The auxiliary stud 8 is provided with a plate 9 made of a metal plate having a required size, an insertion hole 10 is provided near one end of the plate 9, and an auxiliary stud bolt 11 is provided near the other end. There is.

In the illustrated embodiment, the insertion hole 10 is spherically bulged from one surface side to the other surface side of the plate 9 by pressing or the like, and is pierced from the peripheral portion 10a of the bulging portion to the center thereof. A plurality of slits 10c, 10c, ... Are radially formed over the formed hole 10b.
Has a diameter slightly smaller than the outer diameter of the stud bolt 2 welded to the iron shell 1 when not in use, and the hole 10b is formed from the concave surface side (upper surface side in FIG. 1) of the bulging portion.
When passing the stud bolt 2 through the slits 10c, 10
Due to the presence of c ..., The inner peripheral edge of the hole 10b is squeezed in the removal direction after the insertion, so that the hole 10b cannot be easily removed.

The auxiliary stud bolt 11 penetrates the plate 9 and is fastened to the screw of the inserted portion by nuts 12 and 13 from both sides of the plate 9, and the screw at the other end is screwed with a nut 14 for fixing the lining. Are combined. The auxiliary stud bolt 11 may be fixed to the plate 9 by welding. Further, FIG. 3 is a plan view showing an example in which the plate 9 has a disk shape, but the shape of the plate 9 may be arbitrarily selected.

Next, the operation of the above embodiment will be described. Iron skin 1
If the tip of the stud bolt 2 that is welded to is melted and loses its ability to retain the lining by the nut 4,
Peel off the damaged lining at the damaged location to the undamaged layer. In FIG. 2, A shows an undamaged lining layer.

As a result, the shaft portion of the stud bolt 2 is exposed, and the insertion hole 10 of the plate 9 of the auxiliary stud 8 is inserted from the tip of the stud bolt 2. At this time, if the tip of the stud bolt 2 is inserted into the hole portion 10b from the concave surface side of the bulging portion of the insertion hole 10, the hole portion 10b becomes the slit 10.
c, 10c, etc. are slightly expanded and fitted, and are pressed into the existing lining layer A so as to be pressed. As a result, the plate 9 is attached so that the inner peripheral edge of the hole 10b does not easily fit into the stud bolt 2 in the removal direction, so that the plate 9 cannot be easily removed.

Then, the nut 14 of the auxiliary stud bolt 11 fixed to the plate 9 is removed, a blanket for forming a new lining layer B is inserted, and then the washer 15 and the nut 14 are fitted to the auxiliary stud bolt 11. When tightened, a new lining layer B is formed as shown in FIG. 2 and the repair is completed.

The insertion hole 10 formed in the plate 9
In the illustrated example, a bulging portion is formed and a hole 1 is formed at the center thereof.
Although the case where 0b is provided is shown, it is also possible to prevent the plate 9 from being pulled out by forming a hole portion while leaving the plate 9 in a flat plate shape and forming a radial slit around the hole portion.

[0020]

As described above, according to the present invention, the repaired blanket can be laminated by using the melted stud bolt, so that the lining at the damaged portion is completely removed up to the iron skin. There is no need and it is not necessary to re-weld a new stud bolt to the steel skin, so it is possible to repair using lining material that is not damaged, which can significantly reduce material costs and improve the work efficiency of repair work. It can be greatly improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a repair auxiliary stud according to the present invention.

FIG. 2 is a partial cross-sectional view showing a repair completed state.

FIG. 3 is a plan view showing a modified example of the plate of the auxiliary stud shown in FIG.

FIG. 4 is a sectional view showing a conventional lining fixing means.

FIG. 5 is a cross-sectional view showing a state in which the stud bolt of FIG. 4 is melted and a part of the lining is peeled off.

FIG. 6 is an exemplary cross-sectional view of a conventional stud bolt protection means.

FIG. 7 is an exemplary cross-sectional view of another protection means of the same.

[Explanation of symbols]

 1 Iron skin 2 Stud bolt 3 Ceramic fiber blanket 8 Auxiliary stud for repair 9 Plate 10 Insertion hole 11 Auxiliary stud bolt

Claims (1)

[Claims] 1. A ceramic fiber blanket laminated lining in which a ceramic fiber blanket is inserted and laminated on a stud bolt welded to an iron shell and fixed by a nut, and a plate having a required size is provided.
The stud bolts that have melted and damaged are removed from this plate to form insertion holes that can be inserted, and the auxiliary stud bolts are fixed, and a new ceramic fiber blanket is inserted and supported on the auxiliary stud bolts for repair. Auxiliary studs for repairing ceramic fiber blanket laminated linings.