JP2960308B2 - Refractory for water pipe wall protection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refractory for protecting a water pipe wall of a furnace.

[0002]

2. Description of the Related Art The wall of a large municipal solid waste incinerator has a water tube wall structure in which a large number of water pipes are provided. Heat exchange between the furnace heat generated during incineration and the water flowing through the water pipes is performed. In some cases, waste heat is used, for example, by extracting it as steam and using it for power generation.

In general, the structure of the water pipe wall is such that the water pipes adjacent to the water pipes 1, 1...
… And bolts 3 to fins 2 every 3 water tubes
And the two water pipes 1,1 and the water pipes 1,1
The bolt 3 is passed through a central hole 5 of a panel brick 4 of 200 □ to 350 □ which has been formed in advance so as to be straddled over approximately 1/2 width of The nut 6 is fastened by a nut 7 in the recess 6, and a plug brick 8 (or filler) is packed in the recess 6 to cover the nut 7. , 1 ... are protected.

[0004]

However, the panel brick 4, which is a conventional refractory for protecting the water pipe wall, has a flat planar structure in the operating surface 4a facing the inside of the furnace.
The wall thickness is not uniform with respect to the surface in contact with the water pipes 1, 1,..., So that the temperature distribution in the brick is not uniform, and the internal thermal stress becomes unbalanced and often cracks during use. There was a problem that the brick was peeled and the water pipe was damaged.

In view of the above, the present invention has been made in consideration of the above-mentioned problems, and has been made in view of the above circumstances. It is intended to provide a refractory for use.

[0006]

According to the present invention, there is provided a refractory for protecting a water pipe by covering a surface inside a furnace of water pipes arranged in a line, as a means for solving the problems of the above-mentioned prior art. The refractory is formed so as to have a substantially curved sector-shaped section with a concave curved surface conforming to the curved surface of the water pipe and a convex curved surface having substantially the same curvature as the concave curved surface, and is mounted on the surface of the water pipe. It is characterized in that it is fixed to a water pipe by being penetrated by a bolt for use and fastened with a nut.

[0007]

[Function] The operating surface in the furnace, which is composed of the outer surface of the refractory, has a wavy shape due to the arrangement of concentric outer surfaces with each water pipe in the water pipe row, and each refractory has a substantially uniform thickness. Therefore, the temperature distribution in the refractory is made uniform, and the internal thermal stress is also made uniform to suppress the occurrence of cracks. Further, since the mounting bolts for mounting the refractory are implanted on the surface of the water pipe by welding or the like, the bolts are cooled through the water pipe to maintain a long service life.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows a refractory 10 for protecting a water pipe wall according to the present invention.
FIG. 2 shows a front view of a part of the refractory 10 attached to the water pipe 1, and FIG.
2 shows a cross section taken along line A.

The refractory 10 is made of a refractory brick having a sector-shaped cross section having a substantially equal thickness with a concave curved surface 11 conforming to the curved surface on the outer periphery of the water pipe 1 and a convex curved surface 12 having substantially the same curvature as the concave curved surface 11. In the thickness direction, an appropriate number (2 in the figure)
), And the end of the bolt insertion hole 13 on the side of the convex surface 12 is a large-diameter recess 1.
4 so that the nut 15 can be accommodated.
The width of the refractory 10 is set such that a required joint interval S is larger than the adjacent refractory when the refractory 10 is arranged along the water pipe 1.

The base of a mounting bolt 16 is welded to the surface of the water pipe 1 by bolt insertion holes 13 and 13 of the refractory 10.
13 is fixed at a position corresponding to 13. Water pipe 1,1
An appropriate number of anchor members 17, 17, such as V-shaped and Y-shaped studs, are welded to the fins 2, 2,.

Therefore, when the refractory 10 for protecting the water pipe wall is constructed, the mortar 18 is first applied to the water pipes 1, 1,... And the fins 2, 2,. The bolt insertion holes 13 and 1 of the refractory 10
3, the washer 19 and the nut 15 are fitted to the bolt 16 in the recess 14 on the outer surface side (convex surface 12 side) of the refractory 10, and the nut 15 is tightened and fixed. Then recess 14
Is filled with a filler 20 such as an irregular refractory to protect the bolts 16 and the nuts 15 from heat in the furnace.

By attaching the refractories 10, 10,... To the required areas of the water pipes 1, 1,.
The inside of the furnace is protected by refractories 10, 10,..., And the operating surface in the furnace constituted by the outer surface (convex curved surface 12) of the refractories 10, 10,. .. And the refractories 10, 1
.. Have a substantially uniform thickness, so that the temperature distribution in the refractory is made uniform, the internal thermal stress is made uniform, and the occurrence of cracks is suppressed. Since the mounting bolts 16 for mounting the refractory 10 are welded to the surface of the water pipe 1, the cooling bolts are constantly cooled through the water pipe 1, so that the service life of the bolt 16 can be maintained long. it can.

[0013]

As described above, according to the present invention, the refractory covering the water pipe is formed into a sector-shaped section having substantially the same thickness with a concave curved surface conforming to the curved surface of the water tube and a convex curved surface having substantially the same curvature as the concave curved surface. The refractory has a structure and penetrates the mounting bolts planted on the surface of the water pipe into the refractory and is fastened with a nut, so that the temperature distribution in the refractory is uniform and the thermal stress is even. Cracking is suppressed, and a refractory that is tough against cracking and peeling can be obtained. Also, since the mounting bolts for mounting the refractory are implanted on the surface of the water pipe, the bolts are always cooled through the water pipe, so that the service life can be greatly extended.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a water pipe wall protecting refractory according to the present invention.

FIG. 2 is a front view of a part of a state where the water pipe is constructed.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view showing a construction example of a conventional refractory for protecting a water pipe wall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water pipe 2 Fin 10 Refractory 11 Concave curved surface 12 Convex curved surface 13 Bolt insertion hole 14 Depression 15 Nut 16 Mounting bolt 17 Anchor member

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F27D 1/04 F23G 5/00 F27D 1/12 F27D 1/14

Claims (1)

(57) [Claims] 1. A refractory material for covering the inner surface of a water pipe lined up in a furnace to protect the water pipe, wherein the refractory material has a concave curved surface corresponding to the curved surface of the water pipe and substantially the same as the concave curved surface. It is formed so as to have a sector-shaped cross section of approximately equal thickness with a convex curved surface of curvature, is penetrated by a mounting bolt implanted on the surface of the water pipe, and is fixed to the water pipe by fastening with a nut. Characteristic refractory for water pipe wall protection.