JPH0133141Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a steam separator for a steam generator of a pressurized water nuclear reactor, a moisture separation heater, and other moisture separator structures.

[Prior Art] Conventionally, a typical moisture separator structure in which corrugated plate-shaped (also called mesh-shaped) steam separators are arranged in multiple stages, for example, in two upper and lower stages, is shown in Figure 2. It is.

In FIG. 2, the structure of each steam/water separator 1 and 2 defining a dry steam space inside is schematically illustrated, and the dotted line arrows indicate the gas phase, i.e., the single phase flow of dry steam, and the solid line arrows indicate the single phase flow of dry steam. Those with grid lines indicate gas-liquid two-phase flows, that is, wet steam flows, and those without grid lines indicate separated water single-phase flows. When the water vapor stream 3 containing moisture passes through the steam water separator, dry steam and water are separated, and the drain water 5 separated in the upper stage steam water separator 1 is sent to the lower part of the upper stage steam water separator 1. The water flows through the drain pipe 6 installed at the bottom and is discharged. On the other hand, the wet steam 3 passing through the lower steam-water separator 2 is also separated there, and the separated drain water 7 is transferred to the lower deck plate 10a and the upper deck plate 1.
The water is guided to a separated water reservoir 2a defined between 0b and collected in a drain pipe 8 installed at the center of the lower part of the lower stage steam-water separator 2, where it is discharged. The dry steam stream 9 thus separated in the steam separators 1 and 2 is
The steam is collected in a dry steam space defined inside each of the upper and lower steam separators and exits.

With such a moisture separator structure, if the installation space for the drain pipe 6 at the bottom of the upper stage steam water separator 1 is narrow, the drain pipe 6 should have a sufficient inner diameter to discharge the separated drain water. The number of drains could not be installed, and the drain water was 5
Due to insufficient drainage capacity of
It overflows to the dry steam space side of the dry steam flow 9, is carried into the dry steam flow 9, and is carried over.

[Problems to be solved by the invention] Therefore, with the conventional moisture separator structure, there is a problem in that once separated water gets mixed into the dry steam again, making it impossible to improve the steam/water separation performance. Ta. The purpose of the present invention is to promptly solve this problem.

[Means for Solving the Problem] For this purpose, the moisture separator structure of the present invention has two corrugated plate-shaped steam separators that define a dry steam space inside, arranged in upper and lower stages, and A vertical drain pipe is installed in the separated water pool at the bottom of the separator, and a drainage pipe that hangs down from the separated water pool of the upper stage steam water separator is installed in an intermediate water collection box that is integrally formed with the separated water pool of the lower stage steam water separator and leads to the outside. It is characterized by connecting pipes.

[Function] The water separated by the upper steam-water separator is led to the intermediate water collection box through a drain pipe additionally installed in the separated water pool in addition to the conventional drain pipe in the separated water pool. The intermediate water collection box is connected to the outside, and the separated drain water is also discharged from the intermediate water collection box to the outside. Therefore, the draining capacity of the moisture separator structure is increased.

[Embodiments] Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which the same reference numerals indicate the same or corresponding parts.

In Fig. 1, numeral 1 is an upper corrugated plate-shaped steam/water separator assembled with a square cross section so as to define a dry steam space inside, and a substantially similar cross section below it. However, a lower stage steam water separator 2, which is slightly smaller than the upper stage steam water separator 1, is installed. At the bottom of the upper stage steam-water separator 1, there is a duct-shaped □-shaped separated water reservoir 1a that fluidly communicates with the separator main body.
is provided so as to protrude toward the dry steam space side of the lower steam/water separator 2. A plurality of drain pipes 6 for discharging the separated drain water 5a to the outside are vertically extended from the outer circumferential side of the lower surface of the separated water reservoir 1a, and are extended vertically from the inner circumferential side of the lower surface, that is, the drying of the lower steam water separator 2. A plurality of short drainage pipes 11 similarly hang down and extend from the steam space side.

On the other hand, an intermediate water collection box 12 is provided on the upper deck plate 10b integrally with the lower separated water reservoir 2a defined by the lower deck plate 10a and the upper deck plate 10b of the lower steam water separator 2, The short pipe 11 mentioned above is the intermediate water collection box 1.
It communicates within 2. External drain pipe 8 extending vertically
penetrates the lower deck plate 10a and opens into the separated water reservoir 2a, and an inner drain pipe 14 coaxially disposed within the drain pipe 8 penetrates the lower deck plate 10a and the upper deck plate 10b,
A drain hole 13 opens into the intermediate water collection box 12 .

The moisture separator according to the present invention has such a structure, so that when the steam flow 3 containing moisture passes through the steam separator, steam and water are separated, and then separated in the upper stage steam water separator 1. The drain water flows into the separated water reservoir 1a at the bottom of the upper steam water separator 1,
The water is not only discharged to the outside through the drain pipe 6 installed in the separated water pool 1a as shown by the arrow 5a, but also through the plurality of short pipes 11 also installed in the separated water pool 1a as shown by the arrow 5b. The water is guided into the intermediate water collection box 12, flows down through the drainage hole 13 into the inner drainage pipe 14, and is discharged to the outside. The wet steam 3 passing through the lower steam-water separator 2 is also separated into steam and water there, and the separated drain water 7 is transferred to the lower deck plate 10a and the upper deck plate 1.
The water is guided to a separated water reservoir 2a defined between 0b, and is collected and discharged to an outer drain pipe 8 installed at the center of the lower part of the lower stage steam-water separator 2. The dry steam stream 9 thus separated in the steam separators 1 and 2
is collected in the dry steam spaces of the upper and lower steam separators, and exits to the outside as shown by the dotted arrows.

As described above, according to the embodiment of the present invention, water separated by the upper steam-water separator 1 is added to the conventional drain pipe 6, and an additionally installed short drain pipe 11,
Since the drain is also discharged from the intermediate water collection box 12 and the inner drain pipe 14, the drain discharge capacity is increased.

[Effect of the invention] Therefore, the drain water of the upper stage steam-water separator 1 is sufficiently discharged and does not overflow, so that the carry-over caused by steam is reduced and the performance as a steam-water separator is improved.

Further, in the moisture separator structure of the embodiment in which the drain water of the upper stage and lower stage steam water separators flow through independent drain pipes, the drain discharge capacities do not interfere with each other.

Moreover, the added short pipe 11, intermediate water collection box 12, and inner drain pipe 14 are all connected to the steam separators 1 and 2.
Since the moisture separator can be installed in a dry steam space, the external dimensions of the entire moisture separator structure do not become larger than those of conventional ones.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a moisture separator structure according to the present invention, and FIG. 2 is a partially cutaway perspective view of a conventional moisture separator structure. 1...Upper stage steam water separator, 1a...Upper stage separated water pool, 2...Lower stage steam water separator, 2a...Lower stage separated water pool, 6...Drain pipe, 8...Outside drain pipe, 1
1... Drain short pipe, 12... Intermediate water collection box, 13...
Drain hole, 14...inner drain pipe.

Claims (1)

[Scope of utility model registration request] Corrugated plate-shaped steam-water separators that define a dry steam space inside are arranged in upper and lower stages, and a vertical drain pipe is installed in the separated water pool at the bottom of each steam-water separator, and the separated water pool in the lower stage steam-water separator and A moisture separator structure characterized in that a short drainage pipe hanging down from a separated water pool of an upper stage air-water separator is connected to an integrally formed intermediate water collection box that communicates with the outside.