JPS6123344B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tower-supported chimney having an FRP barrel.

In recent years, just as wet desulfurization equipment has become widespread, there is a trend to reduce the temperature rise by afterburners as an energy-saving measure, and the exhaust gas temperature tends to decrease. As the exhaust gas temperature decreases, various problems arise with conventional linings placed inside chimneys, while FRP, whose use has been restricted until now due to the exhaust gas's high temperature of over 100°C, It has attracted attention because of its acid resistance. There are two ways to use FRP: using FRP in place of conventional lining, and
One possible method is to use it as both the chimney barrel and lining. The subject of the present invention relates to a type of chimney that uses FRP itself for the chimney body and is supported by a steel tower because it is a tall chimney.

Conventional tower-supported chimneys have high strength because their cylinder bodies are made of steel, and the intervals between the horizontal support parts extending horizontally from the tower are relatively large. That is, in Fig. 1, 11 is a steel cylinder, and 12 is a steel cylinder.
is a steel tower erected outside the cylinder body 11 to support it. The steel tower 12 is provided with horizontal support portions 13a to 13e that fit around the barrel 11 and support it at appropriate intervals in the longitudinal direction of the barrel 11. The horizontal support parts 13a to 13e are made of a member having sufficient rigidity to support the cylinder body 11 horizontally extending inward from the steel tower 12, and have inner peripheral edges that fit around the cylinder body 11. The intervals between the horizontal support portions 13a to 13e are relatively large. By the way, if the barrel is made of FRP, the tensile strength is about 1/4 to 1/5 of that of steel, so the spacing between the horizontal support parts should be the same as in the case of a steel barrel. In this case, the section modulus of the FRP barrel must be increased, which makes it expensive. Furthermore, if the spacing between the horizontal support parts is reduced, the number of horizontal support parts increases, the overall weight increases, and the cost becomes high.

In view of these problems, the present invention aims to provide a chimney that does not require increasing the section modulus of the FRP cylinder by increasing the number of supporting points, and also avoids increasing the overall weight as much as possible. Examples will be explained with reference to FIGS. 2 to 7.

In Fig. 2, 1 is a cylinder made of FRP, 2 is a steel tower erected to support the cylinder 1, and is spaced at appropriate intervals in the height direction of the steel tower 2, that is, in the longitudinal direction of the cylinder 1. Horizontal support portions 3a to 3e having sufficient rigidity to support the cylinder body 1 which extends horizontally are provided at every interval. An annular member 4 is provided on the inner periphery of each of the horizontal support parts 3a to 3e, and is fitted onto the outer surface of the cylinder 1 with a slight gap, and the cylinder 1 is supported by the steel tower 2 via the annular member 4. ing. Furthermore, the horizontal support portions 3a~
A ring 5 located in the middle of 3e and externally fitted onto the barrel 1
a to 5e are provided, and the third ring 5a to 5e is
As shown in the figure, it is connected and supported by a tension member 6 made of a wire rope or a tension rod to the outer corner portions of the horizontal support portions 3a to 3e located above and below. Thus, the barrel 1 has each horizontal support part 3a to 3e.
The rings 5a to 5e also support the rings 5a to 5e at intermediate positions, and the rings 5a to 5e are supported by the steel tower 2 by the tension members 6.

The planar shape of the steel tower 2 may be a triangular shape as shown in FIG. 4a, a square shape as shown in FIG. It is preferable to do so from the viewpoint of strength.
In addition, although the illustrated example shows a chimney with one cylinder,
The same can be applied to the case of multiple barrels.

Next, to explain how to install ring 5, the fifth
As shown in the figure, first, the ring 5 is assembled below the upper horizontal support part 3a. This ring 5 is the seventh
As shown in the figure, the split rings 7a and 7b may be arranged to surround the barrel 1 and connected to each other by a connecting member 8. Next, the ring 5 and each outer part of the upper horizontal support part 3a are connected by an upper wire rope 6a, which is an example of a tension member 6, and
A lower wire rope 6b, which is an example of a tension member 6 for connection with the lower horizontal support part 3b, is extended over the upper horizontal support part 3a, and the ring 5 is supported by the lower wire rope 6b. Remove the work scaffolding under the horizontal support section 3a. Thereafter, as shown in FIG. 6, the ring 5 is suspended by the lower wire rope 6b, and then the lower wire rope 6b is hung down and its end is attached to the outer corner of the lower horizontal support part 3b. Connect to the section. Each of the other horizontal support parts 3b, 3c, 3c,
The same thing can be done between each of 3d, . . . . In this way, each ring 5 is firmly fixed to the steel tower 2 via both wire ropes 6a, 6b.

According to the tower-supported chimney with the FRP cylinder body of the present invention, the cylinder body can be supported by the horizontal support part having the annular member, and at the same time, it can be attached to the tower side through the tension member consisting of a wire rope or a tension rod. Since the cylinder body can be supported even between the horizontal support parts with a fixed ring, the cylinder body can be sufficiently supported at multiple locations without increasing the section modulus of the cylinder body, and the number of horizontal support parts can be increased. Compared to the case where there are a large number of support points, the increase in overall weight can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 shows a conventional example, a is a front view, b is a longitudinal sectional view, Fig. 2 is an embodiment of the present invention, a is a front view, b is a longitudinal sectional view, and Fig. 3 is a main part. 4a and 4b are cross-sectional views of steel towers with different cross-sectional shapes, FIGS. 5 and 6 are vertical sectional views showing how to install the ring, and FIG. 7 is an assembly of the ring. It is a top view showing a state. 1... FRP, 2... Steel tower, 3a to 3e... Horizontal support part, 4... Annular member, 5, 5a to 5e...
Ring, 6...Tension member, 6a, 6b...Wire rope.

Claims (1)

[Claims] 1 Equipped with a cylinder made of FRP and a steel tower that supports it, horizontal support parts having sufficient rigidity to support the horizontally extending cylinder are installed on the tower at appropriate intervals in the longitudinal direction of the cylinder. At the same time, an annular member is provided on the inner periphery of the horizontal support portion to fit around the cylinder body,
A ring that fits onto the cylinder body is provided between the horizontal support parts, and the ring and the outer corner parts of the horizontal support part located above and below the ring are connected by a tension member made of a wire rope or a tension rod. A tower-supported chimney with an FRP barrel.