Temporary chimney installation structure

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

[Technical field]

[0001] The present disclosure relates to a temporary chimney. [Background technology]

[0002] For example, in facilities having coal-fired, heavy oil-fired, LNG-fired boilers, or the like, a cement-based lining material is applied to the inner surface of a chimney primarily for the purpose of preventing corrosion of the steel body plate due to exhaust gas (see, for example, Patent Document 1).

[0003] The lining material deteriorates over time due to the penetration of corrosive substances, such as acidic substances, moisture, etc. in the exhaust gas, which reduces its thickness and reduces its rust-preventing ability, making repairs necessary. When repairing the lining material, it is necessary to stop the above-mentioned equipment and stop the exhaust of smoke, so only partial repairs can be made. For this reason, it is proposed to install a temporary chimney around the existing chimney and exhaust smoke from the temporary chimney, thereby repairing the lining material without stopping the equipment. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-152685 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, there is a problem in that there is often not enough space around the existing chimney to construct a temporary chimney.

[0006] The present disclosure has been made in consideration of the above, and aims to provide a temporary chimney that can be installed even when there is not enough work land around the existing chimney. [Means for solving the problem]

[0007] The temporary chimney according to the present disclosure comprises a base portion supported by an existing chimney, and a tube body portion supported by the base portion and positioned along the existing chimney. Effect of the Invention

[0008] According to the present disclosure, an object is to provide a temporary chimney that can be installed even when there is not enough work land around the existing chimney. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing an example of a temporary chimney according to this embodiment. [Diagram 2] FIG. 2 is a side view showing an example of a base part of a temporary chimney. [Diagram 3] FIG. 3 is a plan view showing an example of a base part of a temporary chimney. [Figure 4] FIG. 4 is a side view (partial cross-sectional view) showing an example of a tube body portion of a temporary chimney. [Diagram 5] FIG. 5 is a plan view showing an example of a restricting portion of a temporary chimney. [Figure 6] FIG. 6 is a diagram showing an example of a temporary chimney according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of a temporary chimney according to the present disclosure will be described with reference to the drawings. Note that the present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that are replaceable and easy for a person skilled in the art, or those that are substantially the same.

[0011] 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 in place of the existing chimney 50 during a period when the existing chimney 50 cannot be used.

[0012] The existing chimney 50 discharges exhaust gas from facilities having, for example, coal-fired, heavy oil-fired, or LNG-fired boilers. Such an existing chimney 50 may be provided with a lining material for the purpose of preventing corrosion of the tube body. The temporary chimney 100 is constructed to discharge exhaust gas from the above-mentioned facilities in place of the existing chimney 50, for example, during a period in which the lining material of the existing chimney 50 is repaired. For this reason, the temporary chimney 100 according to this embodiment has a limited period of use.

[0013] As shown in FIG. 1, the temporary chimney 100 has a base portion 10, a tube body portion 20, and a restriction portion 30.

[0014] 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. Fig. 3 is a plan view showing an example of the base portion 10 of the temporary chimney 100. As shown in Figs. 2 and 3, the base portion 10 has a mounting frame 11 and a support frame 12. The mounting frame 11 extends horizontally from the existing chimney 50. The tube body portion 20 is placed on the mounting frame 11.

[0015] The mounting frame 11 has an extension member 11a, a connecting member 11b, and an inner member 11c. The extension members 11a extend horizontally from the existing chimney 50 in parallel or approximately parallel relation to each other.

[0016] The connecting member 11b connects the tips of the extending members 11a to each other and predetermined positions on the base end side. The predetermined positions can be, for example, positions that are the same or nearly the same distance from the tips of the extending members 11a to the connecting member 11b. With this configuration, the extending members 11a and the connecting member 11b form a part that is square or nearly square in plan view.

[0017] The inner member 11c is joined to the extending member 11a and the connecting member 11b. The inner member 11c is disposed at the position of a straight line connecting the midpoints of the four sides of the square or approximately square parts in plan view of the extending member 11a and the connecting member 11b. The inner member 11c is formed in a square or approximately square shape in plan view.

[0018] The support frame 12 extends obliquely downward from the tips of the two extension members 11 a toward the existing chimney 50 and is connected to the existing chimney 50 .

[0019] As described above, the mounting frame 11 and the support frame 12 of the base part 10 are each connected to the existing chimney 50. Therefore, the temporary chimney 100 is configured such that no foundation work is provided, and the existing chimney 50 serves as a supporting structure. The existing chimney 50 is constructed of, for example, metal, concrete, etc., and has sufficient strength to support the temporary chimney 100.

[0020] As shown in Fig. 1, the barrel portion 20 is supported by the base portion 10. The barrel portion 20 is arranged along an existing chimney 50. The barrel portion 20 has a plurality of barrel members 21 joined in the vertical direction. Each of the plurality of barrel members 21 is formed from ordinary steel.

[0021] The tube body portion 20 has an opening 22 for taking in exhaust gas on the side opposite to the side where the existing chimney 50 is installed, and the opening 22 is connected to an exhaust gas flow path 23 of equipment that discharges exhaust gas. The temporary chimney 100 takes in exhaust gas from the opening 22 of the tube body portion 20, and this exhaust gas rises inside the tube body portion 20 and is discharged from the top of the tube body portion 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 routing the exhaust gas flow path 23.

[0022] The multiple barrel members 21 include a first barrel member 21a, a second barrel member 21b, and a third barrel member 21c. The first barrel member 21a is the barrel member 21 arranged at the lowermost position. The first barrel member 21a is placed on the inner member 11c. The second barrel member 21b is the barrel member 21 arranged at the uppermost position.

[0023] A plurality of third body members 21c are disposed between the first body member 21a and the second body member 21b. The third body members 21c are formed to have the same shape and dimensions. The third body members 21c are formed to have, for example, a maximum diameter of 2.5 m or less and a vertical length of 10 m or less. The dimensions of the third body members 21c are not limited to those described above.

[0024] Fig. 4 is a side view (partial cross-sectional view) showing an example of the barrel portion 20 of the temporary chimney 100. As shown in Fig. 4, the barrel members 21 have flange portions 21f at both ends in the vertical direction. The barrel members 21 arranged vertically are joined together in a state where the flange portions 21f are fixed to each other by bolts 21t, rather than by welding.

[0025] In this manner, the multiple cylindrical members 21 are joined without welding because the flange joints of the flange portions 21f are bolted together. Therefore, the construction period for the joining and disassembly operations is shortened compared to when the joining is performed by welding.

[0026] 4, a coating film 21r made of acid-resistant paint may be formed on the inner circumferential surface 21m of each of the multiple barrel members 21. By forming the coating film 21r, it is possible to suppress corrosion of the barrel members 21 during a limited period of use.

[0027] The restricting portion 30 is supported by the existing chimney 50 and restricts the horizontal movement of the tube body portion 20. The restricting portions 30 are arranged at a plurality of positions in the vertical direction. FIG. 5 is a plan view showing an example of the restricting portion 30 of the temporary chimney 100.

[0028] 5, the regulating portion 30 has a regulating frame 31 and a regulating plate 32. The regulating frame 31 has an extending member 31a and a connecting member 31b. The extending members 31a extend in parallel or substantially parallel to each other in the horizontal direction from the existing chimney 50.

[0029] The connecting member 31b connects the tips of the extending members 31a to each other and predetermined positions on the base end side. The predetermined positions can be, for example, positions that are the same or nearly the same distance from the tips of the extending members 31a to the connecting member 31b. With this configuration, the extending members 31a and the connecting member 31b form a part that is square or nearly square in plan view.

[0030] The restricting plate 32 is disposed in a portion surrounded by the extending member 31a and the connecting member 31b. The restricting plate 32 is disposed so as to surround the body portion 20. The restricting plate 32 has an opening 32a having a shape corresponding to the shape of the outer circumferential surface 21s of the body portion 21. In this embodiment, the opening 32a of the restricting plate 32 is, for example, circular. The diameter of the opening 32a is set so as to leave a gap between the opening 32a and the outer circumferential surface 21s of the body portion 21, for example.

[0031] Under normal circumstances, the restricting portion 30 is in a state in which a gap is provided between the restricting plate 32 and the body member 21, that is, in a state in which the movement of the body member 21 is not restricted. In contrast, when the body member 21 is tilted, the body member 21 comes into contact with the restricting plate 32, and the movement in the horizontal direction is restricted by the restricting plate 32. This makes it possible to prevent the body member 21 from becoming too tilted.

[0032] A method for constructing the temporary chimney 100 configured as above will be described. First, the base part 10 is installed on the existing chimney 50. After the base part 10 is installed, the tube body part 20 is installed on the base part 10. In this manner, the temporary chimney 100 can be constructed using the existing chimney 50 as a supporting structure. Therefore, even if sufficient work land cannot be secured around the existing chimney 50, the temporary chimney 100 can be constructed.

[0033] When installing the barrel portion 20, the flange portions 21f of the multiple barrel members 21 can be fixed together with bolts to join them in order from the bottom upward. Furthermore, no lining material or the like is formed inside the barrel portion 20, and flue gas is allowed to flow with the inner circumferential surface of the barrel member 21 exposed or with the coating film 21r formed on the inner circumferential surface of the barrel member 21.

[0034] The temporary chimney 100 is used during the period in which the lining material of the existing chimney 50 is repaired, and therefore, unlike a chimney that is used for a long time such as the existing chimney 50, there is no need to consider corrosion, etc. For this reason, when joining multiple cylindrical body members 21 together, welding is not performed, a joining method is adopted in which the flange portions 21f are joined together with bolts 21t, and a lining material is not provided, so that the temporary chimney 100 can be constructed in a short construction period.

[0035] 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 to prevent the exhaust gas from flowing into the temporary chimney 100.

[0036] Thereafter, the bolts 21t are removed in order from the top of the temporary chimney 100 to separate the barrel members 21. After the lowest barrel member 21 (first barrel member) is removed from the base part 10, the base part 10 is removed from the existing chimney 50. This makes it possible to remove the temporary chimney 100.

[0037] As described above, the temporary chimney 100 according to this embodiment comprises a base portion 10 supported by the existing chimney 50, and a tube body portion 20 supported by the base portion 10 and disposed along the existing chimney 50.

[0038] Therefore, by constructing the base section 10 and the body section 20 using the existing chimney 50 as a supporting structure, it is possible to construct the temporary chimney 100 even if sufficient work land cannot be secured around the existing chimney 50.

[0039] In the temporary chimney 100 according to this embodiment, the barrel portion 20 has a plurality of barrel members 21 joined in the vertical direction, and the barrel members 21 are made of ordinary steel. Therefore, the temporary chimney 100 can be manufactured at low cost.

[0040] In the temporary chimney 100 according to this embodiment, a coating film 21r made of acid-resistant paint is formed on the surface of the multiple cylinder body members 21. Therefore, it is possible to prevent a certain degree of corrosion during use for a limited period of time, such as the period during which the lining material of the existing chimney 50 is repaired.

[0041] In the temporary chimney 100 according to this embodiment, the multiple barrel members 21 include a first barrel member 21a arranged at the bottom, a second barrel member 21b arranged at the top, and multiple third barrel members 21c arranged between the first barrel member 21a and the second barrel member 21b, and at least the third barrel members 21c are formed to have the same shape and dimensions. Therefore, the temporary chimney 100 can be easily manufactured at low cost.

[0042] In the temporary chimney 100 according to this embodiment, the multiple barrel members 21 have flanges 21f at both ends in the vertical direction, and the flanges 21f of the barrel members 21 arranged vertically are joined together in a fixed state by bolts 21t. Therefore, the temporary chimney 100 can be manufactured at low cost and in a short construction period.

[0043] The temporary chimney 100 according to this embodiment further includes a restricting portion 30 that is supported by the existing chimney 50, is disposed so as to surround the cylindrical body portion 20 with a gap between it and the outer peripheral surface of the cylindrical body portion 20, and restricts horizontal movement of the cylindrical body portion 20. Therefore, the cylindrical body portion 20 can be constructed in a stable state.

[0044] In the temporary chimney 100 according to this embodiment, the tube body 20 has an opening 22 for taking in exhaust gas on the side opposite to the side where the existing chimney 50 is installed. Therefore, interference with the existing chimney 50 can be avoided when drawing exhaust gas to the temporary chimney 100.

[0045] In the temporary chimney 100 according to this embodiment, the base section 10 has a mounting frame 11 that extends horizontally from the existing chimney 50 and places the tubular body section 20 on it, and a support frame 12 that extends obliquely downward from the end of the mounting frame 11 opposite the existing chimney 50 side toward the existing chimney 50 side and is connected to the existing chimney 50. Therefore, the base section 10 can be formed firmly, and the tubular body section 20 can be stably placed on it.

[0046] The technical scope of the present invention is not limited to the above embodiment, and can be modified as appropriate without departing from the spirit of the present invention. For example, in the above embodiment, the height of the temporary chimney 100 is the same as that of the existing chimney 50, but the present invention is not limited to this.

[0047] Fig. 6 is a diagram showing an example of a temporary chimney 100A according to a modified example. As shown in Fig. 6, the temporary chimney 100A may have a height lower than that of the existing chimney 50. Also, as shown in Fig. 6, the uppermost cylindrical body member 21 (second cylindrical body member 21b) of the temporary chimney 100A may have a bent shape. [Explanation of symbols]

[0048] 10 Base 11 Mounting frame 11a, 31a Extension member 11b, 31b Connecting member 11c Inner member 12 Support frame 20 Cylinder part 21 Cylinder body member 21a First cylinder body member 21b second tube body member 21c Third barrel member 21f Flange 21m inner surface 21r Coating 21s outer surface 21t Bolt 22,32a opening 23 Exhaust gas flow path 30 Regulatory Department 31 Regulatory Frame 32 Regulatory Board 50 Existing chimney 100,100A Temporary Chimney

Claims

1. An existing chimney installed on the ground and having a lining material provided inside the tube, a temporary chimney having a base part supported on the outer surface of the base part of the existing chimney without contacting the ground, and a tube part supported on the base part and arranged along the existing chimney on the outside of the existing chimney; A temporary chimney installation structure.

2. The cylindrical body portion has a plurality of cylindrical body members joined in the vertical direction, The plurality of cylindrical members are formed of ordinary steel. A temporary chimney installation structure according to claim 1.

3. The cylindrical members each have a surface coated with an acid-resistant paint. A temporary chimney installation structure according to claim 2.

4. The plurality of barrel members include a first barrel member disposed at the lowermost position, a second barrel member disposed at the uppermost position, and a plurality of third barrel members disposed between the first barrel member and the second barrel member, At least the third cylindrical members are formed to have the same shape and dimensions. A temporary chimney installation structure according to claim 2 or 3.

5. The plurality of cylindrical body members have flange portions at both ends in the vertical direction, and the flange portions of the cylindrical body members arranged vertically side by side are joined together in a fixed state by bolts. A temporary chimney installation structure according to any one of claims 2 to 4.

6. The chimney further includes a restricting portion that is supported by the existing chimney, that is disposed so as to surround the cylindrical body portion with a gap between it and an outer peripheral surface of the cylindrical body portion, and that restricts horizontal movement of the cylindrical body portion. A temporary chimney installation structure according to any one of claims 1 to 5.

7. The tube body has an opening for taking in exhaust gas on the side opposite to the side on which the existing chimney is installed. A temporary chimney installation structure according to any one of claims 1 to 6.

8. The base portion is A mounting frame extending horizontally from the existing chimney and mounting the tube body portion thereon; a support frame extending obliquely downward from an end of the mounting frame opposite to the existing chimney side toward the existing chimney side and connected to the existing chimney; have A temporary chimney installation structure according to any one of claims 1 to 7.

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