JP2022150802A - temporary chimney - Google Patents

Abstract

To provide a temporary chimney which can be installed even in the case where there is not enough work site around an existing chimney.SOLUTION: A temporary chimney includes: a base part supported by an existing chimney; and a cylinder part arranged along the existing chimney.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to temporary chimneys.

For example, a cement-based lining material is applied to the inner surface of a chimney in a facility having a coal-fired, heavy oil-fired, LNG-fired boiler, etc., mainly for the purpose of preventing corrosion of the cylinder steel plate due to exhaust gas (see, for example, Patent Document 1).

The lining material deteriorates over time due to permeation of corrosive substances such as acidic substances and moisture in the exhaust gas, the thickness of the lining material decreases over time, and the rust-preventing ability decreases, so repair is required. When repairing the lining material, it is necessary to stop the above equipment and stop the smoke exhaust, so repairs can only be carried out to a partial extent. Therefore, it is proposed to install a temporary chimney around the existing chimney and exhaust the smoke from the temporary chimney to repair the lining material without stopping the equipment.

JP 2012-152685 A

However, there is often a problem that there is not enough work space around the existing chimney for constructing the temporary chimney.

The present disclosure has been made in view of the above, and an object thereof is to provide a temporary chimney that can be installed even when there is not enough work space around the existing chimney.

A temporary chimney according to the present disclosure includes a base portion supported by an existing chimney, and a barrel portion supported by the base portion and arranged along the existing chimney.

An object of the present disclosure is to provide a temporary chimney that can be installed even when there is not enough work space around the existing chimney.

FIG. 1 is a diagram showing an example of a temporary chimney according to this embodiment. FIG. 2 is a side view showing an example of the base portion of the temporary chimney. FIG. 3 is a plan view showing an example of the base of the temporary chimney. FIG. 4 is a side view (partially cross-sectional view) showing an example of the barrel portion of the temporary chimney. FIG. 5 is a plan view showing an example of a regulating portion of a temporary chimney. FIG. 6 is a diagram showing an example of a temporary chimney according to a modification.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the temporary chimney which concerns on this indication is described based on drawing. In addition, this invention is not limited by this embodiment. In addition, components in the following embodiments include components that can be easily replaced by those skilled in the art, or components that are substantially the same.

FIG. 1 is a diagram showing an example of a temporary chimney 100 according to this embodiment. The temporary chimney 100 shown in FIG. 1 discharges exhaust gas instead of the existing chimney 50 during a period when the existing chimney 50 cannot be used.

The existing chimney 50 discharges exhaust gas from equipment having, for example, a coal-fired, heavy oil-fired, LNG-fired boiler, or the like. Such an existing chimney 50 may be provided with a lining material for the purpose of preventing corrosion of the cylinder body. The temporary chimney 100 is constructed in place of the existing chimney 50 in order to discharge the exhaust gas from the above facility, for example, during the period of repairing the lining material of the existing chimney 50 . Therefore, the period of use of the temporary chimney 100 according to this embodiment is limited.

As shown in FIG. 1 , the temporary chimney 100 has a base portion 10 , a barrel portion 20 and a restricting portion 30 .

The base portion 10 is supported by the existing chimney 50 . FIG. 2 is a side view showing an example of the base portion 10 of the temporary chimney 100. As shown in FIG. FIG. 3 is a plan view showing an example of the base portion 10 of the temporary chimney 100. As shown in FIG. As shown in FIGS. 2 and 3 , the base section 10 has a mounting frame 11 and a support frame 12 . The mounting frame 11 extends horizontally from the existing chimney 50 . The mounting frame 11 is mounted with the barrel portion 20 .

The mounting frame 11 has an extension member 11a, a connecting member 11b, and an inner member 11c. Two extending members 11a horizontally extend in parallel or substantially parallel from the existing chimney 50 .

The connecting member 11b connects the distal end portions of the extension members 11a and predetermined positions on the base end side. The predetermined position can be, for example, a position where the distance from the distal end of the extending member 11a is the same or substantially the same as that of the connecting member 11b. With this configuration, the extending member 11a and the connecting member 11b form a square-shaped or substantially square-shaped portion in plan view.

The inner member 11c is joined to the extension member 11a and the connecting member 11b. The inner member 11c is arranged at the position of the straight line connecting the midpoints of the four sides of the square-shaped or substantially square-shaped portions of the extending member 11a and the connecting member 11b. The inner member 11c is formed in a square shape or a substantially square shape in plan view.

The support frame 12 extends obliquely downward from the tip portions of the two extension members 11 a toward the existing chimney 50 and is connected to the existing chimney 50 .

As described above, the mounting frame 11 and the support frame 12 of the base unit 10 are connected to the existing chimney 50 . Therefore, the temporary chimney 100 has no foundation work, and the existing chimney 50 is used as a support structure. The existing chimney 50 is made of metal, concrete, or the like, and has sufficient strength to support the temporary chimney 100 .

As shown in FIG. 1 , the barrel portion 20 is supported by the base portion 10 . The barrel portion 20 is arranged along the existing chimney 50 . The barrel portion 20 has a plurality of barrel members 21 joined together in the vertical direction. Each of the cylinder members 21 is made of ordinary steel.

The cylinder body 20 has an opening 22 for taking in the exhaust on the side opposite to the side where the existing chimney 50 is provided, and an exhaust gas flow path 23 such as equipment for discharging the exhaust gas is connected to the opening 22 . The temporary chimney 100 takes exhaust gas from the opening 22 of the cylinder body 20 , and this exhaust gas rises inside the cylinder body 20 and is discharged from the top of the cylinder body 20 . By arranging the opening 22 on the side opposite to the existing chimney 50, interference with the existing chimney 50 can be avoided when the exhaust gas flow path 23 is routed.

The plurality of barrel members 21 have a first barrel member 21a, a second barrel member 21b, and a third barrel member 21c. The 1st cylinder member 21a is the cylinder member 21 arrange|positioned at the lowest side. The first barrel member 21a is mounted on the inner member 11c described above. The second cylinder body member 21b is the cylinder body member 21 arranged on the uppermost side.

A plurality of third cylinder members 21c are arranged between the first cylinder member 21a and the second cylinder member 21b. The third cylinder members 21c are formed to have the same shape and the same size. The third cylindrical body member 21c is formed to have, for example, a maximum diameter of 2.5 m or less and a vertical length of 10 m or less. In addition, the dimension of the third cylinder member 21c is not limited to the above.

FIG. 4 is a side view (partially cross-sectional view) showing an example of the barrel portion 20 of the temporary chimney 100. As shown in FIG. As shown in FIG. 4, the plurality of cylinder members 21 have flange portions 21f at both ends in the vertical direction. The cylinder members 21 arranged vertically are not welded but are joined with the flange portions 21f fixed to each other by bolts 21t.

In this manner, since the plurality of cylinder members 21 are configured such that the flange joints by the flange portions 21f are bolted, they are joined without welding. Therefore, compared to the case of joining by welding, the construction period for the joining work and the disassembly work can be shortened.

In addition, as shown in a partial cross section in FIG. 4, each of the plurality of cylinder members 21 may have a coating film 21r formed of an acid-resistant paint on the inner peripheral surface 21m. By forming the coating film 21r, it becomes possible to suppress the corrosion of the cylinder member 21 during a limited period of use.

The restricting portion 30 is supported by the existing chimney 50 and restricts the horizontal movement of the barrel portion 20 . The restricting portions 30 are arranged at a plurality of locations in the vertical direction. FIG. 5 is a plan view showing an example of the restriction portion 30 of the temporary chimney 100. As shown in FIG.

As shown in FIG. 5 , the regulating portion 30 has a regulating frame 31 and a regulating plate 32 . The regulation frame 31 has an extension member 31a and a connecting member 31b. Two extending members 31a horizontally extend in parallel or substantially parallel from the existing chimney 50 .

The connecting member 31b connects the distal ends of the extending members 31a and predetermined positions on the proximal end side. The predetermined position can be, for example, a position where the distance from the distal end of the extending member 31a is the same or substantially the same as that of the connecting member 31b. With this configuration, the extending member 31a and the connecting member 31b form a square-shaped or substantially square-shaped portion in plan view.

The restricting plate 32 is arranged in a portion surrounded by the extending member 31a and the connecting member 31b. The regulation plate 32 is arranged so as to surround the barrel portion 20 . The regulating plate 32 has an opening 32 a having a shape corresponding to the shape of the outer peripheral surface 21 s of the cylinder member 21 . In this embodiment, the opening 32a of the regulation plate 32 is, for example, circular. The diameter of the opening 32a is set, for example, so that there is a gap between it and the outer peripheral surface 21s of the cylindrical body member 21. As shown in FIG.

In a normal state, the restricting portion 30 is in a state in which a gap is provided between the restricting plate 32 and the cylinder body member 21, that is, movement of the cylinder body member 21 is not restricted. On the other hand, when the cylindrical body member 21 is tilted, the cylindrical body member 21 abuts against the restricting plate 32, and the restricting plate 32 restricts the movement in the horizontal direction. Therefore, it is possible to suppress the inclination of the cylindrical body member 21 from increasing.

A method of constructing the temporary chimney 100 configured as described above will be described. First, the base portion 10 is installed on the existing chimney 50 . After installing the base part 10 , the barrel part 20 is installed on the base part 10 . Thus, the temporary chimney 100 can be constructed using the existing chimney 50 as a support structure. Therefore, the temporary chimney 100 can be constructed even if a sufficient work site cannot be secured around the existing chimney 50 .

When installing the cylinder body part 20, the flange parts 21f of the cylinder body members 21 can be fixed to each other with bolts so that they can be joined in order from the bottom to the top. In addition, in a state in which the inner peripheral surface of the cylindrical member 21 is exposed without forming a lining material or the like inside the cylindrical member 20, or in a state in which the coating film 21r is formed on the inner peripheral surface of the cylindrical member 21, Distribute smoke.

Since the temporary chimney 100 is used during the period of repairing the lining material of the existing chimney 50, unlike the chimney that is used for a long time like the existing chimney 50, there is no need to consider corrosion. For this reason, when joining a plurality of cylindrical body members 21, a joining method is adopted in which the flange portions 21f are joined with bolts 21t without welding, and no lining material is provided. A temporary chimney 100 can be constructed.

When the repair of the lining material of the existing chimney 50 is completed and the existing chimney 50 becomes usable, the connection of the exhaust gas flow path 23 connected to the temporary chimney 100 is switched to the existing chimney 50, and the exhaust gas is discharged to the temporary chimney 100. keep it from flowing.

After that, the bolts 21t are removed sequentially from the upper part of the temporary chimney 100 to separate the cylinder members 21 from each other. After removing the lowest cylinder member 21 (first cylinder member) from the base portion 10 , the base portion 10 is removed from the existing chimney 50 . Thereby, the temporary chimney 100 can be removed.

As described above, the temporary chimney 100 according to the present embodiment includes the base portion 10 supported by the existing chimney 50, and the cylinder portion 20 supported by the base portion 10 and arranged along the existing chimney 50. Prepare.

Therefore, by constructing the base portion 10 and the cylinder portion 20 using the existing chimney 50 as a support structure, the temporary chimney 100 can be constructed even if a sufficient work site cannot be secured around the existing chimney 50.

In the temporary chimney 100 according to the present embodiment, the tube body part 20 has a plurality of tube body members 21 joined in the vertical direction, and the plurality of tube body members 21 are made of ordinary steel. Therefore, the temporary chimney 100 can be manufactured at low cost.

In the temporary chimney 100 according to the present embodiment, a plurality of cylinder members 21 are coated with acid-resistant paint 21r. Therefore, corrosion can be prevented to a certain extent during use for a limited period of time such as the period of repairing the lining material of the existing chimney 50 .

In the temporary chimney 100 according to the present embodiment, the plurality of cylinder members 21 includes a first cylinder member 21a arranged on the lowermost side, a second cylinder member 21b arranged on the uppermost side, and a first cylinder member 21b arranged on the uppermost side. It has a plurality of third cylinder members 21c arranged between the body member 21a and the second cylinder member 21b, and at least the third cylinder members 21c are formed to have the same shape and the same size. be done. Therefore, the temporary chimney 100 can be easily manufactured at low cost.

In the temporary chimney 100 according to this embodiment, the plurality of cylinder members 21 have flange portions 21f at both ends in the vertical direction, and the flange portions 21f of the cylinder members 21 arranged vertically are connected to each other by bolts 21t. It is joined in a fixed state by Therefore, the temporary chimney 100 can be manufactured at low cost and in a short construction period.

In the temporary chimney 100 according to the present embodiment, it is supported by the existing chimney 50 and arranged so as to surround the cylinder body 20 with a gap between it and the outer peripheral surface of the cylinder body 20. It further includes a restricting portion 30 that restricts movement in the horizontal direction. Therefore, the barrel portion 20 can be constructed in a stable state.

In the temporary chimney 100 according to this embodiment, the cylinder body 20 has an opening 22 for taking in the exhaust gas on the side opposite to the side where the existing chimney 50 is provided. Therefore, interference with the existing chimney 50 can be avoided when exhaust gas is routed to the temporary chimney 100 .

In the temporary chimney 100 according to this embodiment, the base portion 10 includes a mounting frame 11 that extends horizontally from the existing chimney 50 and mounts the barrel portion 20 thereon, and the existing chimney 50 side of the mounting frame 11 . has a support frame 12 extending obliquely downward from the opposite end toward the existing chimney 50 side and connected to the existing chimney 50 . Therefore, the base portion 10 can be formed firmly, and the barrel portion 20 can be placed stably.

The technical scope of the present invention is not limited to the above embodiments, and modifications can be made as appropriate without departing from the scope of the present invention. For example, in the above-described embodiment, the configuration in which the height of the temporary chimney 100 is the same as that of the existing chimney 50 has been described as an example, but the present invention is not limited to this.

FIG. 6 is a diagram showing an example of a temporary chimney 100A according to a modification. As shown in FIG. 6, the temporary chimney 100A may have a height lower than that of the existing chimney 50, for example. Moreover, as shown in FIG. 6, the top cylinder member 21 (second cylinder member 21b) of the temporary chimney 100A may be bent.

10 base portion 11 mounting frames 11a, 31a extension members 11b, 31b connecting member 11c inner member 12 support frame 20 barrel portion 21 barrel member 21a first barrel member 21b second barrel member 21c third barrel Member 21f Flange portion 21m Inner peripheral surface 21r Coating film 21s Outer peripheral surface 21t Bolts 22, 32a Opening 23 Exhaust gas flow path 30 Regulating portion 31 Regulating frame 32 Regulating plate 50 Existing chimney 100, 100A Temporary chimney

Claims (8)

a base supported by the existing chimney;
A temporary chimney comprising: a cylinder body supported by the base and arranged along the existing chimney. The barrel portion has a plurality of barrel members joined in the vertical direction,
The temporary chimney according to claim 1, wherein the plurality of cylinder members are made of ordinary steel. 3. The temporary chimney according to claim 2, wherein a coating film is formed on the surfaces of the plurality of cylindrical body members with an acid-resistant paint. The plurality of cylinder members include a first cylinder member arranged on the lowermost side, a second cylinder member arranged on the uppermost side, and a combination of the first cylinder member and the second cylinder member. a plurality of third barrel members disposed therebetween;
The temporary chimney according to any one of claims 1 to 3, wherein at least the third cylinder members are formed to have the same shape and the same size. 2. A plurality of said cylindrical body members have flange portions at both ends in the vertical direction, and said flange portions of said cylindrical body members arranged vertically are joined in a state of being fixed by bolts. 5. The temporary chimney according to any one of claims 4 to 4. A restricting portion supported by the existing chimney, disposed so as to surround the cylinder body with a gap between it and the outer peripheral surface of the cylinder body, and restricting movement of the cylinder body in the horizontal direction. A temporary chimney according to any one of claims 1 to 5, further comprising: The temporary chimney according to any one of claims 1 to 6, wherein the cylinder body has an opening for taking in exhaust gas on the side opposite to the side where the existing chimney is provided. The base part is
a mounting frame that extends horizontally from the existing chimney and mounts the barrel;
and a support frame extending obliquely downward toward the existing chimney from an end of the mounting frame opposite to the existing chimney and connected to the existing chimney. Temporary chimney according to any one of the preceding paragraphs.

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