DE2007565A1 - Water separator for steam generators in pressurized water reactors - Google Patents

Description

Water separator for steam generators in pressurized water reactors

In steam generators of pressurized water reactors, steam with a relatively high final moisture content is generally generated. However, since the steam supplied to the turbine may only have a final moisture content of 0.25 ° , considerable efforts must be made to largely separate out the water contained in the steam. In this context, numerous water separators that work according to the cyclone principle or according to the principle of gravity have become known. However, all these separators require a relatively large structural effort.

The invention is based on the object of creating a water separator which is extremely simple and nevertheless securely separates. This water separator should be used both as a large separator and as a downstream fine separator can find.

The invention consists in that in the steam space of the steam generator sheets running parallel to the direction of flow are arranged in such a way that numerous parallel channels are prismatic Cross-section result.

It has been shown that when it is introduced lengthways surfaces in a flow of a water-steam mixture through the adhesion between metal and water a surprising high separation effect is created. The water is largely deposited on the walls of the channels and can be discharged from there.

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109 a. . / ί ι 8 7 3

_ J? - VPA 70/9409

For better drainage of the water deposited on the canals, it is advantageous if on the individual canal walls for example, collecting channels that are open opposite to the direction of flow are arranged for the water precipitated on the canal walls. It is also advantageous if in each case Direction of flow open drainage channels for on the channel walls running water are provided. Thereby, both Auffangais and drainage channels with drainage pipes for the separated Be provided with water.

Based on a schematic drawing 3ind structure and mode of operation of embodiments according to the invention explained in more detail. Show:

Pig. 1 shows a longitudinal section through an upper part of a steam generator for pressurized water reactors,

Pig. 2 shows a cross section through this steam generator according to the section line II-II and

Pig. 3 shows a section from such a water separator in the area of a channel wall.

After Pig. 1, the steam generator consists of a cylindrical housing 1 with a U-tube heat exchanger tube bundle 2 through which . the primary medium flows and gives off its heat to the secondary water flowing up between these ^ pipes and this evaporates. A water separator 3 according to the invention is shown above this actual heat exchanger 2. This As can be seen in particular from the cross section according to FIG. 2, the water separator 3 consists of metal sheets 4 running parallel to the direction of flow numerous parallel channels with a prismatic cross-section are formed. The cross-sectional shape of these channels can be arbitrary be,

In Pig. 2 are four different options for the arrangement of the sheets shown. These can be grid-like, only

10 9 S 7 3

VPA 70/9409

run parallel to each other, radially or in concentric circles.

Due to the adhesive effect between the metal of the sheets and The water separates from the water-steam mixture flowing through it on the canal walls and can be discharged from here will. The separation effect is also dependent on the length of the ducts, since longer ducts also have a larger one Total separation is achieved.

In Fig. 3, such a channel wall 4 is at, for example parallel sheets shown in cross section. In this case, according to the illustrated embodiments, at the upper end of the duct wall 4 a collecting channel 5 open against the direction of flow is arranged, into which the channel wall 4 along creeping water that is carried upwards by the steam flow is caught. The separated water can then over a drain pipe 6 can be discharged to the lower part of the evaporator.

Furthermore, two drainage channels 7 are shown in this channel wall, which are open in the direction of flow and extend to both sides of the duct wall. In these gutters 7 is water running down on the channel walls 4 collected and also discharged via drainage pipes 6.

With the very simply constructed water separator described, there is a relatively high separation of the water-steam mixture contained water possible, with this surface separator as a fine separator behind a conventional pre-separator, such as for example a centrifugal separator, or as a sole separator in the vapor space of a Steam generator can be used.

4 claims
3 figures

1 0 9 a .ι i. / ü 8 7 3

Claims (4)

VPA 70/9409 Claims M .J water separator, especially for standing steam generators of pressurized water reactors, characterized in that in the steam space (8) of the steam generator (1) parallel to Sheets running in the direction of flow are arranged in such a way that that there are numerous parallel channels (5) prismatic cross-section. 2. "water separator according to claim 1, characterized in that on the individual channel walls (4) against the direction of flow, open collecting channels (5) for that on the channel walls (4) separated water are arranged. 3. Water separator according to claim 1 and 2, characterized in that that in each case in the flow direction upwardly open drainage channels (7) for draining on the channel walls (4) Water are provided. 4. Water separator according to claim 2 or 3, characterized in that that the collecting and drainage channels (5,7) with drainage pipes (6) are provided for the separated water. 109 ο '/ 1) 8 7 3