JP3125594B2 - Steam turbine exhaust pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust pipe for discharging steam discharged from a steam turbine to the outside of the turbine.

[0002]

2. Description of the Related Art An exhaust pipe for discharging steam discharged from a steam turbine used for electric power or industrial use to the outside of a turbine is constructed by welding a divided exhaust pipe obtained by dividing an exhaust pipe and installing the steam turbine. At a predetermined installation position determined in advance. In this case, a manufacturing error of the exhaust pipe and the turbine alone and an installation error of the exhaust pipe and its mounting base are inevitable, so an adjustment margin is provided to a necessary length of the divided exhaust pipe forming the exhaust pipe to absorb the error. The exhaust pipe is provided with an adjusting unit for removing the exhaust pipe after being temporarily assembled and adjusting the adjustment margin.

FIG. 4 is a side view of a steam turbine facility provided with this type of exhaust pipe. The prior art will be described below with reference to FIG. The steam turbine 1 is installed on a turbine mount 3 provided on the second floor 2 at the same level. The exhaust pipe 5 discharges the steam discharged from the steam turbine 1 to the outside of the turbine. The exhaust pipe 5 passes between the second floor 2 and the first floor 6 from the exhaust port of the steam turbine 1 to the exhaust pipe base 7. It is supported and installed.

Here, the exhaust pipe 5 is formed by welding divided exhaust pipes obtained by dividing the exhaust pipe 5 and must be installed at the installation position of the exhaust pipe 5 shown in FIG. For this reason, an adjustment margin is provided for the required length of the divided exhaust pipes to be connected as described above, and an adjustment section 10 is provided on the exhaust pipe 5 for adjusting the adjustment margin and welding when installing the exhaust pipe. ing.

[0005] As shown in FIG. 5, the adjusting section 10 is manufactured by providing one of the divided exhaust pipes 8 and 9 obtained by dividing the exhaust pipe 5, for example, the divided exhaust pipe 8 with an adjustment margin 11. Then, the exhaust pipe 5 is temporarily assembled at the site, and adjusted so that the exhaust pipe 5 is at a predetermined installation position. After confirming the processing dimensions of the margin 11, the removal is performed. Cut and reassemble, split exhaust pipes 8 and 9
Are joined by welding, and the exhaust pipe 5 is installed at a predetermined installation position.

[0006]

As described above, in order to install the exhaust pipe at a predetermined installation position, a divided exhaust pipe obtained by dividing the exhaust pipe is temporarily assembled, and then removed and an adjustment margin provided on the divided exhaust pipe is provided. However, since the exhaust pipe is usually large in diameter, there is a problem that it takes a lot of labor and time to perform on-site installation and removal of the exhaust pipe, and work on the adjustment margin. is there.

SUMMARY OF THE INVENTION An object of the present invention is to provide a steam turbine exhaust pipe which can be installed without necessitating a temporary assembly or an adjustment margin when installing the exhaust pipe at a predetermined installation position predetermined on site. It is to be.

[0008]

According to the present invention, an exhaust pipe for discharging steam discharged from a steam turbine to the outside of the turbine is welded to a divided exhaust pipe obtained by dividing the exhaust pipe. In the exhaust pipe of the steam turbine to be joined and installed at a predetermined installation position, one of the divided exhaust pipes to be connected for installation is inserted into one of the first divided exhaust pipes, and the other is the second divided exhaust pipe A cylindrical body having a height greater than this displacement that absorbs a displacement in the pipe axis direction that occurs at the time of installation that is insufficient for the connection between the pipe and the first divided exhaust pipe, and further, when installing the first and second divided exhaust pipes This pipe has a size large enough to absorb the vertical displacement and torsion of the generated pipe axis and to mount the cylindrical body into which the first divided exhaust pipe is inserted, and to the pipe end of the second divided exhaust pipe. Phosphorus attached by welding around the end port When the exhaust pipe is installed at a predetermined installation position, the cylindrical body is inserted into the first divided exhaust pipe, the cylindrical body is placed on the ring plate, and one end of the cylindrical body is attached to the ring plate. The exhaust pipe is installed by welding and joining the other end to the first divided exhaust pipe by welding.

[0009]

The exhaust pipe for discharging the steam discharged from the steam turbine to the outside of the turbine is manufactured by dividing the exhaust pipe into divided exhaust pipes, and joining the divided exhaust pipes on site by welding to a predetermined predetermined pipe. It is installed at the installation position. In this case, in order to install in a predetermined installation position, one of the first divided exhaust pipes of the divided exhaust pipes to be connected is inserted,
A cylindrical body having a height larger than the displacement in the pipe axis direction generated at the time of installation, which is insufficient for the connection between the other second divided exhaust pipe and the first divided exhaust pipe, is provided. The ring plate having a size capable of mounting the cylindrical body into which the first divided exhaust pipe has been inserted by absorbing the vertical displacement and twist of the pipe axis generated at the time of installation of the second divided exhaust pipe is provided. To the pipe end of the split exhaust pipe, surrounding the pipe end of this pipe end. When the exhaust pipe is installed at a predetermined installation position by the first split exhaust pipe, the cylindrical body, and the second split exhaust pipe to which the ring plate is attached, the first split exhaust pipe is inserted into the cylindrical body. The cylindrical body is placed on a ring plate attached to the second split exhaust pipe, and the cylindrical body and the ring plate, and the cylindrical body and the first split exhaust pipe are joined by welding to form the first and second split pipes. Insufficient connection in the pipe axis direction that occurs during installation on the exhaust pipe,
Even if there is a deviation and a twist in the vertical direction of the pipe axis, the first split exhaust pipe as manufactured and the second split exhaust pipe with the ring plate attached thereto are installed through the cylindrical body through a predetermined installation of the exhaust pipe. It can be installed at a position and does not require temporary assembling or adjustment work of adjustment margin as in the past.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partial cross-sectional view of a connection portion of a divided exhaust pipe when a divided exhaust pipe is connected and an exhaust pipe is installed according to an embodiment of the present invention. In FIG. 1, the same components as those of the conventional example of FIGS. 2 and 3 are denoted by the same reference numerals, and the description thereof will be omitted. FIG.
In this case, if the split exhaust pipes 8 and 9 are installed as they are manufactured, the displacement of the pipe shafts in the pipe axis direction caused by the installation of the split exhaust pipes 8 and 9 will be insufficient, and the pipe axis will be shifted in the vertical direction. And torsion occurs.

In such a case, there is provided a cylinder 24 for absorbing displacement which has a height larger than this displacement, surrounds the divided exhaust pipe 8 and has an inner diameter into which the divided exhaust pipe 8 is inserted. This cylindrical body 24 is a cylinder 21 surrounding the divided exhaust pipe 8.
And a ring plate 22 having an inner diameter into which the divided exhaust pipe 8 is inserted into one end face of the cylinder. On the other hand, the cylindrical body 24 can be placed at the pipe end of the divided exhaust pipe 9, and the split exhaust pipe 8 is inserted by absorbing the vertical displacement and twist of the pipe axis generated when the divided exhaust pipes 8 and 9 are installed. Cylindrical body 2
A ring plate 25 large enough to face 4 is attached by welding around the pipe end of the pipe end of the divided exhaust pipe 9.

With this configuration, when the exhaust pipe is installed at a predetermined installation position, the adjusting section 1 of the exhaust pipe 5 shown in FIG.
0, the cylindrical body 24 is inserted into the divided exhaust pipe 8 to be connected, and then the cylindrical body 24 is placed on the ring plate 25 attached to the divided exhaust pipe 9, and the ring plate 22 of the cylindrical body 24 is connected. The divided exhaust pipe 8 and the divided exhaust pipe 8 are joined at a welding location 26, while the cylinder 20 of the cylindrical body 24 and the ring plate 25 attached to the divided exhaust pipe 9 are joined at a welding location 27 by fillet welding.

In this way, when the exhaust pipe is installed, the gap in the connection in the pipe axis direction caused by the installation of the as-manufactured split exhaust pipes 8 and 9 is reduced. 8 and the vertical displacement and torsion of the pipe axis are absorbed by the joined cylindrical body 24 and the divided exhaust pipe 9, so that the divided exhaust pipe 8 and the split exhaust pipe to which the ring plate 25 is attached are manufactured. 9 can form an exhaust pipe 5 via a cylindrical body 24 and can be installed at a predetermined installation position.

In this embodiment, the cylindrical body 24 has the split exhaust pipe 8 inserted therein, while the ring plate 25 is attached to the split exhaust pipe 9. The same effect as described above can be obtained even if the above is attached to the split exhaust pipe 8.

[0015]

As is clear from the above description, according to the present invention, according to the present invention, a cylindrical body into which one of the first divided exhaust pipes of the divided exhaust pipe to be connected is inserted is provided. The as-manufactured first split exhaust pipe and the second split exhaust pipe to which the other ring plate is attached are arranged at predetermined installation positions, and the cylindrical body inserted into the first split exhaust pipe is inserted into the second split exhaust pipe. Is mounted on the ring plate attached to the divided exhaust pipe, and the cylindrical body and the first divided exhaust pipe and the ring plate and the cylindrical body are joined by welding, so that the first and second divided exhaust pipes to be connected are installed. The first split exhaust pipe and the second split exhaust pipe to which the ring plate is attached are manufactured by absorbing any deviation in the pipe axis direction that may occur, and any deviation and twist in the vertical direction of the pipe axis. The exhaust pipe can be installed at a predetermined installation position by the and the cylindrical body.

By installing the exhaust pipe by each of the above means,
Since conventional processes such as temporary assembling, removal after temporary assembling, and adjustment processing of adjustment margin can be eliminated, a significant cost reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a connection portion of a divided exhaust pipe when a divided exhaust pipe is connected and an exhaust pipe is installed according to an embodiment of the present invention.

FIG. 2 is a side view of a steam turbine facility with an exhaust pipe installed.

FIG. 3 is a partial cross-sectional view of a connection portion of a divided exhaust pipe in the exhaust pipe of FIG. 2;

[Explanation of symbols]

 5 Exhaust pipe 8 Split exhaust pipe 9 Split exhaust pipe 13 Cylindrical body 18 Ring plate 24 Cylindrical body 25 Ring plate

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F01D 25/28-25/30

Claims (1)

(57) [Claims] An exhaust pipe for a steam turbine which is installed at a predetermined installation position by welding an exhaust pipe for discharging steam discharged from a steam turbine to the outside of the turbine and welding the divided exhaust pipe obtained by dividing the exhaust pipe to a predetermined installation position. This occurs at the time of installation in which one of the first divided exhaust pipes of the divided exhaust pipes to be connected for installation is inserted and the connection between the other second divided exhaust pipe and the first divided exhaust pipe is insufficient. A cylindrical body having a height larger than the displacement for absorbing the displacement in the tube axis direction;
The second split exhaust pipe has a size large enough to accommodate the cylindrical body into which the first split exhaust pipe is inserted by absorbing vertical displacement and torsion of the pipe axis generated at the time of installation of the second split exhaust pipe; At the pipe end of the divided exhaust pipe, a ring plate surrounding the pipe end of the pipe end is provided by welding, and when the exhaust pipe is installed at a predetermined installation position, the cylindrical body is attached to the first split exhaust pipe. The exhaust pipe is installed by inserting the cylindrical body on a ring plate, welding one end of the cylindrical body to the ring plate by welding, and joining the other end to the first split exhaust pipe by welding. The exhaust pipe of a steam turbine.