JPH0584803B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a piping built-in power generation device that generates power using steam used in steel, chemical plants, etc.

[Prior art and its problems]

FIG. 2 shows a cross-sectional view of a power generation device with built-in piping that generates electricity using steam, which is conventionally used in steel plants, chemical plants, etc.

In FIG. 2, a steam turbine casing 2 is connected to a pipe 1b and contains a steam turbine rotor 1 therein. The generator includes a rotor 3 disposed on the low-pressure side of the steam turbine and integrally connected to the shaft of the steam turbine rotor 1, and a stator 4 located on the outer diameter side of the rotor 3 and covered with a frame 5. There is. The outer pipe 6 is arranged so as to cover the frame 5 of the generator while keeping a gap from the frame 5, and has one end connected to the steam turbine casing 2 and the other end connected to a reducer 7 forming a part of the pipe. 8 and 9 are guides for rectifying the flow of steam, and 1
0 and 11 are bearing brackets, 12 and 13
is a bearing. Bearings 12 and 13 are protected by bearing covers 14 and 15. A power generation device consisting of these steam turbines and a generator is supported by the outer piping 6 via a strut 17, and is incorporated into the piping 16 so as to be built into the outer piping.

Steam flows in from the high pressure side and enters the steam turbine rotor 1.
, most of which flows in the axial direction along the outer diameter side of the generator frame 5 and flows toward the low pressure side. Some of the steam flows from the high-pressure side through the inside of the generator to the low-pressure side through the gap between the stator and rotor.

According to this structure, steam also flows into the generator, so the insulation of the stator windings must be highly moisture resistant. In addition, the bearing cover 1 is used as a countermeasure against rust caused by water droplets on the bearing and as a countermeasure against scale caused by steam.
4 and 15 were required.

[Purpose of the invention]

The purpose of the present invention is to completely close the generator in a piping built-in power generation device to prevent steam from entering the generator, thereby simplifying the insulation of the stator winding and simplifying the structure around the bearing. shall be.

[Key points of the invention]

The present invention provides a power generation device with built-in piping, which includes a steam turbine connected to piping through which steam flows, a generator coupled to the low-pressure side of the steam turbine, and an outer piping arranged on the outer diameter side of the generator. In this case, the generator is completely closed, and all the steam that has passed through the steam turbine is allowed to flow between the outer piping and the generator frame, thereby preventing steam from entering the generator and insulating the stator windings. This is a simplified version of .

[Embodiments of the invention]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, which is connected to a pipe 34 through which steam used in steel, chemical plants, etc. flows and is arranged along the pipe direction. The steam turbine casing 22 is connected to the piping 34
The steam turbine rotor 21 is connected to the steam turbine rotor 21 and has a built-in steam turbine rotor 21. The generator includes a rotor 23 and a stator 24, which are arranged on the low-pressure side of the steam turbine and are concentrically connected to the shaft of the steam turbine rotor 21. Outside piping 2
Reference numeral 6 is arranged on the outer diameter side of the generator frame 25 that covers the stator, and one end is connected to the steam turbine casing 22. 27 is an outlet reducer connected to the other end of the outer pipe 26 and forming a part of the pipe. 28 is a seal ring, and a labyrinth is provided in the shaft penetrating portion of the seal ring, so that the structure is such that steam does not enter into the generator. 2
Reference numeral 9 denotes an end cover on the opposite side of the turbine, which has a structure that can withstand the differential pressure between the steam pressure and the air pressure inside the generator. 30 and 31 are bearing brackets, and 32 and 33 are bearings. 34 is a pipe, and 35 is a support that supports the generator on the outer pipe 26. After the steam passes through the steam turbine, all the steam flows between the outer pipe 26 and the generator frame 25, where it reduces the heat generated from the generator to steam, and further passes through the outlet reducer 27 and the counter-turbine. It flows between the side end covers and flows to the low pressure side.

This structure prevents steam from entering the generator. The invention can be implemented in gas turbines as well.

〔Effect of the invention〕

According to the present invention, since steam does not infiltrate inside the generator, the rotor windings are not exposed to moisture, so insulation can be simplified, and the bearings do not require measures against steam scale. The structure of the bearing can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a built-in piping type power generation device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a built-in piping type power generation device according to a conventional example. In the figure, 1, 21...steam turbine rotor, 2, 22... steam turbine casing, 3,
23... Rotor, 4, 24... Stator, 5, 25
...Frame, 6,26...Outside piping, 16,3
4... Piping, 28... Seal ring, 29... Anti-turbine side end cover.

Claims (1)

[Claims] 1. A steam turbine connected to piping through which steam flows, a generator coupled to the low pressure side of the steam turbine, and a generator arranged on the outer diameter side of the generator, with one end coupled to the steam turbine casing and the other end A power generation device with built-in piping that includes an outer pipe connected to the pipe, characterized in that the generator is completely closed and all the steam that has passed through the steam turbine flows between the outer pipe and the frame of the generator. A power generation device with built-in piping.