JPH11173536A - Pipeline for high-temperature fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce labor from the laying work of a pipeline for a high- temperature fluid by reducing the number of bolts used for fixing liner pieces. SOLUTION: A pipeline 1 for a high-temperature fluid is constituted by providing a refractory 3 on the internal surface of a metallic duct 2 and arranging a plurality of cylindrical liners 4, each of which is composed of a plurality of liner pieces 5-8 arranged in the peripheral direction with a clearance between each piece 5-8 so as to absorb the thermal expansion of each piece 5-8, in the axial direction of the duct 2 on the refractory 3. Of the liner piece 5-8 constituting each liner 4, the liners 7 and 8 are fixed to the duct 2 and the other liners 5 and 6 are not fixed to the duct, but supported by the fixed liner pieces 7 and 8 or refractory 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-temperature fluid pipe through which a high-temperature fluid such as a high-temperature gas flows.

[0002]

2. Description of the Related Art High-temperature fluid pipes are used, for example, as combustion gas pipes in incinerators and melting equipment. As such a device, a melting device for melting incinerated ash such as refuse will be described with reference to FIG. In this apparatus, incineration ash 51 is supplied to a melting furnace 53 together with high-temperature air 52,
It is heated and melted by the burner 54, and the melt 55 is discharged from the lower part of the melting furnace 53. And high-temperature exhaust gas 5
6 is discharged from the pipe 1 connected to the side of the melting furnace 53 through a heat exchanger 57 and a dust collector 58 to an air blower 59 and discharged into the atmosphere. The air 52 is taken in by the blower 60 and exchanges heat with the exhaust gas 56 in the heat exchanger 57 to be heated.

The pipe 1 is provided with a refractory such as a brick inside a metal duct and a liner for protecting the refractory inside the metal duct in order to withstand the high temperature of the exhaust gas 56 of 1000 ° C. or more. It is desirable to have a configuration.

As this type of high-temperature fluid piping, Japanese Unexamined Patent Publication No.
JP-A-144993 can be mentioned. In this piping, as shown in FIG.
A large number of hollow cylindrical liners 62 are arranged in the axial direction in the inside of the inside, and a gap δ is provided between adjacent liners 62 to absorb the thermal expansion thereof. A cylindrical heat insulating material (refractory) 63 is inserted between the outer tube 61 and the liner 62, and the heat insulating material 63 and the liner 62 are arranged in a staggered manner. The liner 62 is located at a central position in the longitudinal direction.
It is held by an annular support 64 fixed inside the outer tube 61, and is fixed to the outer tube 61 by a plurality of bolts 65 screwed into the support 64.

In the high-temperature fluid pipe according to the present invention, the liner 62 and the heat insulating material 63 are arranged in a staggered manner, so that even if there is a gap δ between the adjacent liners 62, 62, the high-temperature exhaust gas is directly discharged. Since the outer tube 61 does not come into contact with the outer tube 61, the temperature of the outer tube 61 is not locally high.

By the way, as the liner 62 for circulating a high-temperature fluid, a material which gives priority to heat resistance and sacrifices physical characteristics is used as a material. A large temperature difference generated between the side and the back side in contact with the heat insulating material 63 causes thermal deformation. Therefore, when the hollow cylindrical liner 62 is fixed to the outer tube 61 at a plurality of locations by the bolts 65, a large stress acts on the liner 62, and there is a problem that cracks are easily generated by the stress.

To cope with this, in a place where the temperature becomes high as described above, the cylindrical liner is divided into a plurality of arc-shaped liner pieces arranged in the circumferential direction, and a gap is provided between adjacent liner pieces. Therefore, a pipe that prevents the deformation and crack may be used. In this case, all the liner pieces are fixed to the outer tube by bolts.

[0008]

However, since the number of the liner pieces is very large, fixing all the liner pieces to the outer tube with bolts requires a lot of labor and increases the cost. There is.

Further, if a large number of bolt through-holes are provided in the outer tube, the strength of the bolts will be reduced.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to reduce the number of mounting bolts for a liner piece and to save labor for the construction work.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a method in which a portion of a liner piece among a liner piece constituting a cylindrical liner arranged in the axial direction inside a duct is connected to the duct. Since the other liner piece is fixed and supported by the fixed liner piece or the refractory, the liner piece can be installed with a small number of bolts, and the construction of the liner is facilitated.

In addition, when the fixed liner pieces and the unfixed liner pieces of the liners, which are located at least at both ends of the duct, are engaged with each other to suppress the movement of the unfixed liner pieces in the axial direction of the duct, the heat is reduced. The unfixed liner pieces are prevented from falling off during expansion or construction work.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. As shown in the drawing, the high-temperature fluid pipe 1 has a refractory 3 provided inside a rectangular cylindrical metal duct 2 and a plurality of cylindrical liners 4 arranged in the axial direction of the duct 2 inside the refractory 3. It has a configuration. In FIGS. 2 and 3, the number of the intermediate liners 4 sandwiched between the liners 4 at both ends is one, but the number of arrangements is arbitrarily determined according to the length of the duct 2.

Each of the liners 4 is composed of four liner pieces 5 to 8 arranged in the circumferential direction, and the liner pieces 5 to 8 have a substantially square shape with a side length of about 300 mm or less. In each liner 4, the liner pieces 7 and 8 on both sides are fixed to the duct 2 by bolts 9, and the lower liner piece 5 is refractory 3
The upper liner piece 6 is placed on both side liner pieces 7 and 8.

Here, the liner pieces 7 and 8 are provided with seats 10 for screwing the bolts 9, and the heads of the bolts 9 abut against the duct 2, and project in the form of ribs to penetrate through holes of the bolts. Seat 11 for preventing duct strength reduction due to formation
Is provided.

On the other hand, the unfixed liner pieces 5 and 6 have seats 10.
It is not necessary to provide the seat 11 in the duct 2, so that the labor for manufacturing the liner pieces 5 and 6 and the duct 2 is reduced. In addition, when installing the liner pieces 5 and 6, there is no need to screw the bolt 9.

Also, between the liner pieces 7, 8 and the liner piece 5,
In addition, since a gap is provided between the liner piece 6 and the refractory 3, the vertical expansion of the liner pieces 7, 8 around the bolt 9 at high temperatures is absorbed. Furthermore, since the width of the liner pieces 5 and 6 is smaller than the width of the inside of the refractory 3, expansion in the width direction of the liner pieces 5 and 6 is absorbed. Therefore, even if high-temperature exhaust gas flows into the pipe 1 and the liner pieces 5 to 8 expand, a large compressive stress does not act on them. The gap between the liner piece 6 and the refractory 3 is designed to be almost eliminated when the liner piece 6 is lifted by the thermal expansion of the liner pieces 7 and 8.

In the liners 4 located at both ends of the duct 2, projections 12 are formed on the liner pieces 7, 8, and cutouts 13 are formed on the liner pieces 5, 6 to engage with the projections 12. I have. Due to this engagement, the movement of the duct 2 in the axial direction due to the thermal expansion of the liner pieces 5 and 6 and the inclination at the time of construction can be suppressed. Here, the positions of the protrusion 12 and the notch 13 in the axial direction of the liner 4 are arbitrary.

The projections 12 and the cutouts 13 are provided not only on the liners 4 at both ends of the duct 2 but also on the liner pieces 5 to 8 of several liners 4 interposed therebetween, and these are engaged. By doing so, the amount of movement of the liner pieces 5, 6 can be further suppressed.

As shown in FIG. 5, all the liners 4
In this case, when the liner pieces 5 and 6 are engaged with the liner pieces 7 and 8, the gap between the adjacent liners 4 and 4 is maintained even when the duct 2 is inclined or vertically arranged, and the upper liner 4
The weight of the liner pieces 5 and 6 does not add to the liner pieces 7 and 8 of the bottom liner 4.

In addition, as shown in FIG. 6, even when the duct 2 has a cylindrical shape, the liner pieces 5 to 8 are formed in an arc shape, thereby adopting the same configuration as in the case where the duct 2 has a rectangular cylindrical shape. be able to.

Further, when the cross section of the duct 2 is large, as shown in FIGS. 7 and 8, the liner 4 is divided into more liner pieces 14 and 15 than in the above-described embodiment, and the liner 4 is fixed to the duct 2. The pieces 14 and the unfixed liner pieces 15 may be alternately arranged, and the liner pieces 15 may be engaged with and supported by the liner pieces 14. In this case, liner piece 1
When the four and 15 are thermally expanded, the adjacent liner pieces 14, 1
5 is designed so that the gap between them is almost eliminated.

[0023]

As described above, according to the present invention, a part of the liner pieces constituting the cylindrical liners arranged in the axial direction inside the duct is fixed to the duct, Since the other liner pieces are supported by the fixed liner pieces or the refractory, the number of bolts for attaching the liner pieces to the duct can be reduced, and the work of mounting and replacing the duct can be facilitated.

Further, since the number of bolt through holes provided in the duct can be reduced, the strength of the duct does not decrease so much, and the number of reinforcing ribs accompanying the formation of the through hole can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of an embodiment of a high-temperature fluid pipe according to the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a perspective view of the liner according to the first embodiment;

FIG. 5 is a schematic side view showing an inclined state when installing the same pipe.

FIG. 6 is a longitudinal sectional front view showing an arrangement state of a liner piece according to another embodiment of the present invention;

FIG. 7 is a longitudinal sectional front view showing an arrangement state of a liner piece according to another embodiment of the above.

FIG. 8 is a longitudinal sectional front view of another embodiment of the above.

FIG. 9 is a schematic diagram of an incineration ash melting apparatus.

FIG. 10 is a longitudinal sectional side view of a conventional high-temperature fluid pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-temperature fluid piping 2 Duct 3 Refractory 4 Liner 5 to 8 Liner piece 10, 11 Seat 12 Projection 13 Notch 14, 15 Liner piece

Claims (2)

[Claims] 1. A refractory is provided inside a metal duct, a plurality of cylindrical liners arranged in the axial direction of the duct are provided inside the refractory, and each liner is formed from a plurality of liner pieces arranged in a circumferential direction. In the high-temperature fluid piping provided with a gap for absorbing thermal expansion of the liner piece, of the liner pieces constituting each liner, some of the liner pieces are fixed to the duct, and other liner pieces are connected to the duct. A pipe for a high-temperature fluid, wherein the unfixed liner piece is supported by the fixed liner piece or a refractory without being fixed. 2. A fixed liner piece and an unfixed liner piece which are located at least at both ends of the duct among the liners are engaged with each other to suppress the movement of the unfixed liner piece in the axial direction of the duct. The high-temperature fluid piping according to claim 1, wherein: