JPS5888405A - Scale remover of geothermal steam turbine - Google Patents

Abstract

PURPOSE:To remove scale in steam and prevent erosion of a nozzle member or the like, by providing to communicate a strainer jointly used for reinforcement to a steam cabin partly in an internal peripheral wall dividing the steam cabin of a casing main unit. CONSTITUTION:A casing main unit 1 enclosed in a geothermal steam turbine comprises a steam cabin 2 divided by an internal peripheral wall 1a, while a nozzle member 6, in which a nozzle 5 is constituted by nozzle outer rings 3 and nozzle inner rings 4, is secured to the inside of the wall 1a. Here a strainer 7 jointly used as reinforcement is set partly to the wall 1a. This strainer 7 is constituted such that a porous outer cylindrical unit 9 and inner cylindrical unit 10 are fitted in each peripheral groove 8a, 8b of a pair of mounting members 8 partly embedded to the wall 1a, and plural net members 11 provided with a mesh from coarseness to fineness are interposed between the both units 9, 10. In this way, scale contained in steam can be surely seized and removed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a scale removal device for a geothermal steam turbine in a geothermal power plant that utilizes geothermal steam.

Technical background of the invention and its problems In general, the steam emitted from a geothermal well and the steam produced by flushing (decompression boiling) the geothermal water pumped from the geothermal well at 7 tetsunya contain minerals, salt, and sulfur. In order to prevent this scale from flowing into the geothermal steam turbine together with the steam and accumulating, a strainer is installed in the steam transport pipe such as the main steam pipe.
◎ However, it is difficult to completely remove the scale present in the steam through this strainer, and the scale in the steam that has passed through this strainer flows into the geothermal steam turbine. It gradually accumulates in the steam flow path made up of nozzle members, rotor blades, etc., or corrodes the materials that make up the nozzle members, reducing their functionality and preventing failures. Yes, there is that too.

That is, conventionally, this type of geothermal steam turbine has been constructed with a nine-part main body aK steam casing, as shown in Fig. 11. + is divided by inner peripheral wall &1, and this inner peripheral wall a
On the inside of 1, the nozzle outer ring C and the nozzle inner ring d form the nozzle.
Fix the nozzle member f constituting the
, a plurality of stay pipes 1 are attached to a part of the steam pipe I
On the other hand, a generator h directly connected to a generator (not shown) K is rotatably mounted on the casing body a located inside the inner circumferential wall 110.
A large number of blades 1 are provided so as to be adjacent to the nozzle member f().
The steam that has entered the room is transferred to each of the stay pipes 80 and 11 and to each nozzle of the nozzle member 10, and the steam expanded in each nozzle becomes variable energy and is transferred to the above-mentioned overnight. Give the blade of the roof Ikg1 rolling force,
However, from fk, when the scale contained in the steam flows into the large geothermal steam turbine, one scale flows through the steam through the nozzle member f, blade IN1, etc. As a result, the area of the steam flow passage is narrowed and the design flow rate of steam is impaired, which not only reduces the operating efficiency of the steam turbine, but also reduces the
It is predicted that N1 etc. will be eroded by the scale and cause failure 1, which will impair the reliability and safety of the geothermal steam turbine.

Purpose of the Invention The present invention has been made in view of the above-mentioned circumstances, and incorporates a strainer that also serves as reinforcement into the casing body of a geothermal steam turbine, thereby completely eliminating scale contained in the steam. This technology aims to improve the reliability and safety of geothermal steam turbines by removing them and preventing scale buildup and erosion in steam flow paths such as nozzle members and blades. Summary of the Invention #1 This invention provides a scale removing device, in which a steam yabbin is formed within a casing main body by dividing it with an inner circumferential wall, and a nozzle member is fixed to the inner side of the inner circumferential wall. A strainer, which also serves as reinforcement, is installed in a part of the inner circumferential wall so as to communicate with the steamer pin.

EMBODIMENTS OF THE INVENTION The present invention will now be described with reference to an illustrated embodiment IP11. In FIGS. The casing body IK is formed by a steam yabbin 2 divided by an inner circumferential wall 1aK, and between the inside of ζO and the inside of the horse wall 1aO is a nozzle member 6 that constitutes a nozzle S with a nozzle outer ring 3 and a nozzle inner ring 4. is layered, and the inner peripheral wall 1
A strainer 7, which also serves as reinforcement, is installed in a part of the steam turbine 1 so as to communicate with the steam turbine 3. That is,
As shown in FIGS. 3 and 4m, the strainer 7 has a porous outer cylindrical body 811 in each circumferential groove of a pair of hardened wood fences, in which a part of the inner circumferential wall 1 is provided. 9 and the porous inner cylindrical body 10 are steel plated, and the porous outer cylindrical body 9 and the porous inner cylindrical body 10 are
A plurality of steel members 11 having meshes ranging from coarse to dense are interposed between the casing body IK and the casing body IK located inside the inner circumferential wall 1a. A rotor 12 directly connected to the nozzle member 60 is rotatably mounted on a shaft, and this rotor ν is provided with a large number of blades IP, 13 so as to be adjacent to the nozzle member 60 and the nozzle 5. - A pair of pressure detection tubes 14 are provided in the casing body l where the steam turbine 2 is located and the inner circumferential wall 11 located inside the porous inner cylinder 10 of the strainer 7.
, 15 are provided outwardly, so that the steam that has now flowed into the yabin 2 in the steam of the casing body 1 flows through the porous outer cylinder 9 of the strainer 7, each net member 11, and the porous inner cylinder. By passing through 1O, the scales that meet in the steam are overgrown and become #*, and then the nozzle member 6
While being diverted to each nozzle chain, the bad air expands within each nozzle b and applies a rotational force to the blades 13 of the rotor ν, causing them to rotate.

In addition, since the scales encountered in the steam are removed by the strainer 1, there is no fear of corroding the nozzle member 6 or accumulating scale and narrowing the flow path structure. When scale is deposited on the tube 7, a pressure difference is created between both pressure detection tubes 14 and the intestines, so this can be detected immediately by the pressure needle 17. According to the present invention, KINm*Yabiy2 inside the case Ving main body 1 is divided and formed by the inside 11111a, and the nozzle member is attached to the inside of the inner circumferential wall 1aO. Peripheral wall 11.0 - wing which also served as reinforcement) 1/-tt above steam I? It is installed in such a way that it communicates with the snow, and the scale that meets the steam can be completely removed once and for all.It has excellent effects such as reducing the risk of narrowing the road area. has.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a part of a conventional geothermal steam turbine;
Figure 2 is a sectional view showing a part of a geothermal steam turbine incorporating the scale removal device according to the present invention, Figure S is a sectional view corresponding to the dashed line in Figure 2, and Figure 4 is an exploded view of the present invention. FIG. 1... Caning body, 1 &... Inner peripheral wall, 2...
Steam cabin, 6... Nozzle member, 7... Strainer, 8... Mounting member, 9... Porous outer cylinder, 10...
- Porous inner cylinder, U...steel member, ν...rotor, mouth...blade, 14°7...pressure detection tube.

Claims (1)

[Scope of Claims] 1. A steam turbine is formed in the main body of the cable cylinder by dividing it with an inner peripheral wall, and a nozzle member is fixed inside the inner peripheral wall,
A geothermal steam turbine YO scale removal device 02 characterized in that a strainer serving as reinforcement is installed in a part of the inner circumferential wall so as to communicate with the steam yabin. Claim 1: A scale removal device for a geothermal steam turbine y by Kisoft, characterized in that it is constructed by interposing a plurality of control materials between the body and the body.