JPS5838205B2 - Corrugated plate support device for steam/water separation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a corrugated plate support device for a steam/water separator, and more particularly to a corrugated plate support device for a steam/water separator equipped with a corrugated plate suitable for use in steam turbines for nuclear power generation, etc. .

Recently, as the capacity of nuclear couplants has increased, they have come to use high-pressure, high-humidity steam.

However, unlike general thermal power plants, they do not use high-pressure, high-humidity superheated steam, but instead use large amounts of steam that is close to saturation.

This saturated steam generates a large amount of moisture during the process of expansion in the turbine, and this moisture can cause harmful phenomena such as erosion of the turbine blades and reduction in internal efficiency during turbine operation. known to cause

Therefore, it is necessary to take measures to reduce the moisture content in the steam, and one such measure is to install a steam/water separation device in plant equipment.

In this steam/water separator, the heaviest part that affects the moisture separation performance is the corrugated plate, and it is important to align and fix the corrugated plates parallel to the corrugated plate support frame and each independently. be.

Generally, a well-known method for fixing this corrugated sheet is to use a hollow cylindrical spacer to attach the corrugated sheet to a hole drilled in the corrugated sheet using a rond. There was a drawback that a gap was created between the corrugated plate and the spacer because the attached rond expanded linearly.

When this gap is created, vibration stress caused by the steam flow is generated around the holes drilled in the corrugated sheet, causing the corrugated sheet to break.

SUMMARY OF THE INVENTION An object of the present invention is to provide a corrugated plate support device that eliminates the gap between the corrugated plate and the spacer and prevents the corrugated plate from being damaged in high-humidity steam.

The present invention allows materials with a small coefficient of linear expansion to expand freely, and restrains materials with a large coefficient of linear expansion so that they do not elongate beyond the elongation amount of the material with a small coefficient of linear expansion. We focused on the fact that compressive force is generated in a material with a large coefficient of linear expansion when heated to a high temperature, and this compressive force is used as a fixing force for the corrugated plate.

That is, in the present invention, the spacer that maintains a constant interval between the corrugated sheets is made of a material having a coefficient of linear expansion larger than that of the material of the rod that attaches the plurality of arranged corrugated sheets to the support frame. With this structure, a corrugated sheet support device is obtained which can prevent the generation of a gap between the corrugated sheet and the spacer and prevent the corrugated sheet from being damaged.

The present invention will be explained below based on the drawings.

1 to 5 show an embodiment of the present invention,
As shown in FIGS. 1 and 2, the steam with high moisture flowing in from two inlet pipes 2 provided below the pressure vessel 1 is The support frames 30 are arranged in two rows in a ■ shape with the direction of flow changed between
The water is passed through a plurality of corrugated plates 4 stored therein, where air and water are separated.

The steam with reduced moisture is taken out to the outside through three outlet pipes 5 provided above the pressure vessel 1.

The water separated by the corrugated plate 4 is guided through a drain receiver 6 to a drain pipe 7 provided at the center of the pressure vessel 1, and is discharged to the outside by a drain tank 8.

To explain the configuration of the corrugated sheet 4 in more detail, in FIGS. 3 and 4, each corrugated sheet 4 has a continuous V-shaped bent portion 9 and straight portions 10 and 11 at the inlet and outlet portions. It is constructed with

The bent portion 9 is provided with a corrugated plate 4 as shown in FIG.
A first key plate 12a and a second key plate 12b are provided along the corrugated plate 4 and the first key plate 12a.
A space 13a is formed between the corrugated plate 4 and the second key plate 12b.
A second space 13b is formed between them.

Each corrugated plate 4 is arranged and held at arbitrary intervals on the support frame 3 by a hollow cylindrical spacer 14 and a pin 15 penetrated through a hole provided in the corrugated plate 4.

The steam containing a large amount of moisture flowing into the corrugated plate flow path, that is, the steam flow path 44 formed between the opposing corrugated plates 4, 4,
The steam flows through the curved steam flow path 44 (the moisture in the steam is trapped in the second space 13b via the slot 16 due to the centrifugal force due to the deflection of the flow and the inertia of the water droplets).

The trapped moisture flows along the surface 17 and into the first space 1
3a, water droplets fall downward along the corrugated plate 4 due to gravity, are collected in the drain receiver 6, are guided to the drain pipe 7, and are discharged to the outside by the drain tank 8.

In the above-mentioned steam/water separation device, the present invention provides the above-mentioned spacer 14
The rod 15 is characterized in that it is made of a material having a coefficient of linear expansion larger than that of the material of the rod 15.

Preferably, the spacer 14 is made of an austenitic metal material with a large coefficient of linear expansion, and the corrugated plate 4, rod 15, and support frame 3 are made of a ferrite metal material with a small coefficient of linear expansion.

As a result, compressive force is generated in each spacer 14 made of a metal material with a large coefficient of linear expansion in high humidity steam, thereby fixing the corrugated sheet 4 without creating a gap between the space 14 and the corrugated sheet 4. be able to.

Figure 5 shows the length of 1 m of austenitic metal material and ferrite metal material from 20°C to a certain temperature. Indicates the amount of linear expansion per unit.

Next, FIG. 6 shows another embodiment of the present invention, in which a bolt 18 is used in place of the rod 15,
Nut 20 and lock nut 21 through collar 19
By tightening the waveform 4 and the spacer 14, the waveform 4 and the spacer 14 are fixed.

In this embodiment, the bolt 18 is preliminarily given an elongation corresponding to 1.1 to 1.2 times the difference in elongation in high-temperature steam at room temperature.

As a result, in this embodiment, a force for fixing the spacer 14 can be applied to the bolt 18 in high-temperature steam, so that the corrugated plate 4 can be fixed even more strongly.

The present invention has the structure and operation detailed above, and according to the present invention, there is an effect of eliminating the gap that occurs between the corrugated plate and the spacer in high-temperature steam, and preventing damage to the corrugated plate. has.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
Figure 1 is a cross-sectional view of the steam/water separator, and Figure 2 is A of Figure 1.
- An enlarged perspective view along line A, Figure 3 is a perspective view of a portion along line B-B in Figure 2, Figure 4 is an enlarged sectional view taken from C in Figure 3, and Figure 5 is linear expansion. FIG. 6 is a partially enlarged sectional view of another embodiment of the present invention. 3...Support frame, 4...Corrugated plate, 14...
...Spacer, 15... Rod, 18...
...Bolt, 20...Nut.

Claims (1)

[Claims] 1. A support frame that stores the corrugated sheets, a spacer that maintains a constant distance between the corrugated sheets stored in this support frame, and a spacer that passes through the spacer and the corrugated sheets to attach these spacers and the corrugated sheets to the support frame. A corrugated plate support device for a steam/water separator, characterized in that the spacer is made of a material having a linear expansion coefficient larger than that of the material of the rond. .