JP2000336975A - Chimney - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrosion prevention type chimney in which the formation of a heat bridge section onto the interior wall of an internal cylinder is prevented by simple structure and corrosion due to dew condensation can be prevented. SOLUTION: The chimney 15 is composed of an internal cylinder 1, in which a heat-insulating material 8 is wound on an external surface and an internal surface is used as a flue, and a supporting material 16 supporting the internal cylinder 1 on the external surface side of the internal cylinder 1. The internal cylinder 1 is made of a steel plate, the whole external surface la of the internal cylinder 1 is covered with the heat-insulating material 8, and a heat-insulating protective cover 20 is installed onto the surface of the heat-insulating material 8. On the other hand, the supporting material 16 comprises a supporting material body 17 and a ring-shaped member 18, and these body and member are connected by a connector 19, and constituted integrally. Since the ring-shaped member 18 is not fixed onto the external surface of the heat-insulating material 8 and the internal cylinder 1 is supported through the heat-insulating material 8, the whole external surface of the internal cylinder 1 is covered uniformly with the heat-insulating material 8 and an exposed section can be removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chimney for use in a refuse incineration facility and the like, and more particularly to an anticorrosion type chimney capable of preventing corrosion occurring on an inner wall near a support point of a support member of an inner cylinder constituting the chimney. About.

[0002]

2. Description of the Related Art Exhaust gas generated in a refuse incineration facility or the like is a high-temperature gas of 900 to 1000 ° C. at the stage of leaving the furnace, but is purified by a dust collector or the like to become an exhaust gas of a temperature of 100 to 300 ° C. , Passes through the chimney and is released into the atmosphere. Exhaust gas emitted from the chimney into the atmosphere rises at a higher temperature because of a higher emission speed, and can be diffused far away. Therefore, it is necessary to prevent heat radiation from the chimney and to suppress a decrease in the temperature of the exhaust gas. From the above, in general, the chimney is insulated (insulated) using an insulating material (insulating material).

[0003] This type of chimney is generally large,
Due to the problem of strength and corrosion, a double-tubular chimney composed of an inner cylinder and an outer cylinder is used. The inner cylinder is made of a steel plate, and its size is usually 50 m or more in height, and the inner diameter of the inner cylinder is 800 mm or more.
2000 mm. The outer cylinder is erected as a strength member, and the inner cylinder is supported by the outer cylinder and a frame-shaped support member at several locations in the height direction.

Further, when the inner cylinder is supported, as described above, the exhaust gas having a temperature of 100 to 300 ° C. passes through the inner cylinder during operation, so that the inner cylinder expands and contracts vertically due to a temperature change. Therefore, it is necessary to provide an engaging means or the like which can slide.

FIG. 3 is an enlarged view of a main part showing an example of a chimney made up of a support member and an inner cylinder in which a heat insulating material is wound on the outer surface and the inner surface is a flue, and FIG. It is sectional drawing by the A line arrow.

A reinforcing ring 2 is fixed to the outer peripheral surface of the inner cylinder 1 by welding, and the reinforcing ring 2 is supported by a support member 3 by engaging means 4. The reinforcing ring 2 is hollow, and a heat insulating material 8 is loaded therein, and the inner and outer peripheral portions of the reinforcing ring are insulated. Glass wool is used as the heat insulating material 8.

The engaging means 4 is composed of an anti-vibration member 5 provided on the reinforcing ring 2 and a receiving member 7 having a vertical groove 6 provided on the support member 3. Generally, four engaging means 4 are provided at opposing positions on the outer peripheral surface of the reinforcing ring 2. The anti-vibration fitting 5 is fitted in the groove 6 of the receiving fitting 7 so as to be freely movable in the vertical direction, and can cope with expansion and contraction in the vertical direction due to thermal expansion.

The inner cylinder 1 is made of a steel plate, and a heat insulating material 8 is wound around its outer surface. 9a and 9b are inner cylinder 1
And 10 a joint between the joints 9 a and 9 b of the inner cylinder 1. The anti-vibration bracket 5 is generally H
The section steel is provided by welding to the outer peripheral surface of the reinforcing ring 2.

[0009] As another example, Japanese Patent Application Laid-Open No. 9-250733 discloses an inner cylinder in which a heat insulating material is wound around an outer surface and an inner surface of which is a flue, and a support for supporting the inner cylinder on the outer surface side of the inner cylinder. A steel chimney comprising a member and a member is disclosed. FIG. 5 is a sectional view showing a main part of the steel chimney. 3 and 4 are denoted by the same reference numerals, and a part of the description is omitted.

In this example, a support point material 11 is fixed to the support material 3. On the other hand, the reinforcing ring 2 of the inner cylinder 1 is fixed to the outer peripheral surface of the inner cylinder at a position facing the supporting point material 11. The reinforcing ring 2 is provided with a gap for absorbing thermal expansion from the supporting point material 11.

Further, an inner plate 12 is fastened to the inner cylinder 1 by bolts 13 on the flue side of the inner cylinder 1. Inner plate 12
Is a gap 1 for allowing air from the pipe to flow into the inner cylinder 1.
4 are formed and arranged. Further, the inner plate 12 is provided with an adjacent inner plate 12 and an expansion allowance d.

According to the above-mentioned steel chimney, dry air is introduced into the gap 14 between the inner wall of the inner cylinder 1 and the inner plate 12 from below the inner cylinder 1 by piping and a blower. Therefore, it is described that during operation of the steel chimney, the outer surface of the inner cylinder 1 is prevented from radiating heat by the heat insulating material 8 and the inner wall of the inner cylinder 1 does not come into contact with the exhaust gas, so that dew condensation does not occur.

[0013]

However, the above-mentioned prior art has the following problems.

In the example shown in FIG. 3 and FIG.
Is made of a steel plate, is fixed to the outer peripheral surface of the inner cylinder 1 by welding or the like, and the anti-vibration metal fitting 5 which is attached to the reinforcing ring 2 by welding is exposed to the outside air. Therefore, even if the inside of the reinforcing ring 2 is filled with the heat insulating material 8, the retained heat of the inner cylinder 1 is dissipated from the joints 9 a and 9 b to the reinforcing ring 2 by heat transfer. Thus, the joint 9
Since a and 9b are cooled to form a thermal bridge, when exhaust gas passes through the inner cylinder 1, dew condensation occurs on the inner wall 10 between the joints 9a and 9b of the inner cylinder 2, and the inner cylinder 1 is corroded. Occurs.

On the other hand, a steel chimney disclosed in Japanese Patent Laid-Open No. 9-250733 discloses a steel chimney which has a gap 1 between the inner wall of the inner cylinder 1 and the inner plate.
Since the nozzle 4 is formed, it is expected that dry air flows into the gap 14 during operation to prevent the inner wall of the inner cylinder 1 from coming into contact with the exhaust gas, thereby preventing dew condensation. However, inner cylinder 1
The internal plate 12 needs to be adhered to the inside, additional equipment such as dry air piping and an air blower is required, and the amount of exhaust gas from the inner cylinder 1 is increased more than necessary.

The present invention has been made to solve the above-described problems, and has a simple structure that prevents the formation of a thermal bridge on the inner wall of the inner cylinder and prevents corrosion due to dew condensation. It is intended to provide a chimney.

[0017]

The present invention relates to a chimney comprising an inner cylinder having an outer surface wound with a heat insulating material, and a supporting material for supporting the inner tube via the heat insulating material. The supporting material is composed of a supporting material main body and a ring-shaped member connected to the supporting material main body and surrounding an outer peripheral surface of the heat insulating material, and the heat insulating material is supported so as to be movable in the ring-shaped member. It is a chimney.

According to the present invention, since the ring-shaped member is not fixed to the outer surface of the heat insulating material of the inner tube having the heat insulating material wound around the outer surface, the inner tube is supported via the heat insulating material. The entire outer surface of the tube can be covered with a heat insulating material to completely eliminate the exposed portion. As a result, since heat dissipated from the outer surface of the inner cylinder to the ring-shaped member is not conducted, no thermal bridge is formed on the inner wall of the inner cylinder, and corrosion due to condensation can be prevented.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view showing an example of an embodiment according to the present invention. The chimney 15 is composed of an inner cylinder 1 around which a heat insulating material 8 is wound on the outer surface and whose inner surface is a flue, and a support member 16 which supports the inner cylinder 1 on the outer surface side of the inner cylinder 1.

The inner cylinder 1 is made of a steel plate, and the entire outer surface 1a of the inner cylinder 1 is covered with a heat insulating material 8. A heat insulating protective cover 20 is attached to the surface of the heat insulating material 8. Glass wool or the like is used for the heat insulating material 8.

On the other hand, the supporting member 16 is composed of a supporting member main body 17 and a ring-shaped member 18, which are connected by a connecting member 19 to be integrally formed.

The ring-shaped member 18 penetrates through the inner cylinder 1 on which the heat insulating material 8 is wound over the entire surface.
It is supported so that it can move inside.

As a result, the inner cylinder is operated at 100 to 300 ° C.
Even if the exhaust gas having the temperature of?

Further, even if the inner cylinder 1 comes into contact with the ring-shaped member 18 while being deviated due to vibration, earthquake, wind load, etc., an eccentric load is applied in the axial direction of the ring-shaped member 18 and no bending moment is generated. That is, since the inner cylinder side has a shell structure in which the load is received, it can be handled only by the axial force, and no bending moment is generated.

Since the ring-shaped member 18 does not need to be fixed to the outer peripheral surface of the inner cylinder 1 by welding or the like, the function as a support member can be exhibited by appropriately selecting a material. An example of the material of the ring-shaped member 18 is an elastic material such as rubber. The elastic material can absorb the eccentric force and reduce it. When the inner cylinder 1 is inclined or deviated, the contact area with the heat insulating material is increased, so that damage to the heat insulating material is reduced.

A rubber ring-shaped member having a cavity can be used by filling it with air to provide elasticity, and a rubber ring-shaped member having no cavity can be used by embedding steel or an organic fiber cord to provide strength and rigidity.

It is also possible to use an iron ring or an iron ring provided with a cover made of an elastic material.
As the shape of the ring-shaped member 18, a ring having a cross-sectional shape such as a circle, a corner, or an ellipse can be used.

When the ring-shaped member 18 is attached to the inner cylinder 1, it can be attached to the inner cylinder member in advance as an integral body, and then can be aligned. Also, after assembling the inner cylinder using the ring-shaped member 18 of a two-split type, three-split type, or the like, the ring-shaped member 18 can be attached to a predetermined position of the inner cylinder and joined with bolts or the like. In the case of a split ring member, an appropriate gap can be provided between the split rings.

The connecting member 19 of the ring-shaped member 18 is
9a and a receiving plate 19b, which are joined by a fixing tool 19c such as a bolt. Although one connecting tool is shown as a representative of the connecting tools 19 in the drawing, two to four connecting tools 19 are usually used. The connecting member 19 includes the ring-shaped member 18.
Is mounted on the outer peripheral surface of the base member so as to face the shaft core.

For example, in the case of a double-tube chimney, the supporting body 17 of the supporting member is assembled in a frame shape at several places in the height direction in the outer cylinder of the strength member.

As described above, as apparent from the embodiment, according to the present invention, the ring-shaped member is prevented from being fixed to the outer surface of the heat insulating material of the inner cylinder having the heat insulating material wound around the outer surface. Since the inner cylinder is supported through the inner cylinder, the entire outer surface of the inner cylinder 1 can be uniformly covered with the heat insulating material, and the exposed portion can be eliminated. As a result, heat dissipated from the outer surface of the inner cylinder 1 is insulated, so that no thermal bridge is formed on the inner wall of the inner cylinder 1 and corrosion due to dew condensation can be prevented.

FIG. 2 is a sectional view showing a horizontal frame when the anticorrosion chimney of the present invention is used as a collective chimney. 1 are given the same reference numerals, and a part of the description will be omitted.

The chimney 21 has four chimneys 15 installed in an outer cylinder 22. As shown in FIG. 1, each chimney 15 supports the inner cylinder 1 on a support member (horizontal frame member) composed of a ring-shaped member 18 joined by a connector 19 and a support body 17. .

Each chimney 15 supports the inner cylinder 1 via the heat insulating material 8 so that the ring-shaped member 18 does not adhere to the outer surface of the heat insulating material of the inner cylinder 1 having the heat insulating material 8 wound around the outer surface. Therefore, the entire outer peripheral surface of the inner cylinder 1 can completely cover the exposed portion by winding the heat insulating material 8. Therefore, even if the exhaust gas passes through the inside of the inner cylinder 1, the heat dissipated from the outer peripheral surface of the inner cylinder 1 disappears, and no thermal bridge portion is formed on the inner wall of the inner cylinder. Therefore, the chimney 2
No dew condensation occurs on the inner wall of each of the inner cylinders 1 and no corrosion occurs. Note that a protective cylinder for protecting the heat insulating material 8 may be wound around the outer surface of the heat insulating material 8.

[0036]

As described above, according to the present invention, the supporting member has a simple structure including the supporting member main body and the ring-shaped member connected to the supporting member main body and surrounding the outer peripheral surface of the heat insulating material.
The formation of a thermal bridge on the inner wall of the inner cylinder can be prevented, and corrosion due to condensation can be prevented.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view showing a horizontal frame when the anticorrosion chimney of the present invention is used as a collective chimney.

FIG. 3 is an enlarged view of a main part showing an example of a conventional chimney composed of a supporting member and an inner cylinder in which a heat insulating material is wound around an outer surface and the inner surface is a flue.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is a sectional view showing a main part of a conventional steel chimney.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner cylinder 1a Outer surface 2 Reinforcement ring 3, 16 Support member 4 Engagement means 5 Vibration fitting 6 Groove 7 Receptacle 8 Insulation material 9a, 9b Joint part between inner cylinder and reinforcement ring 10 Inner wall between joint parts 11 Support point Material 12 Inner plate 13 Bolt 14 Clearance 15 Chimney 16 Supporting material 17 Supporting material main body 18 Ring-shaped member 19 Connector 19a Retaining plate 19b Receiving plate 19c Fixing device 20 Thermal protection cover 21 Collecting chimney 22 Outer cylinder

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeru Ena 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Japan Inside the Kokan Co., Ltd. (72) Inventor Hitoshi Kobayashi 1-1-2, Marunouchi 1-chome, Chiyoda-ku, Tokyo Date Honko Co., Ltd.

Claims (1)

[Claims] 1. A chimney comprising: an inner cylinder having an outer surface wound with a heat insulating material; and a supporting material supporting the inner cylinder via the heat insulating material, wherein the supporting material is a supporting material main body, A chimney, comprising: a ring-shaped member connected to a support member main body and surrounding an outer peripheral surface of the heat-insulating material, wherein the heat-insulating material is supported so as to be movable in the ring-shaped member.