JPS6023760Y2 - Bergisch Gladbach, Federal Republic of Germany (no street address) - Google Patents

Description

[Detailed description of the invention] The present invention is a regenerative heat exchanger inserted into a circulation circuit of a liquid medium to pre-cool the medium, a post-cooler and a filter. The medium filtered by the filter is cooled to an acceptable temperature for the filter, and the medium filtered by the filter is conducted as a cooling medium to the regenerative heat exchanger, and the regenerative heat exchanger, the postcooler, and the filter are placed in one vertical cylindrical container. The present invention relates to a purification system for a water-cooled nuclear reactor mounted on a ship, for example.

In pressurized water reactors, the purification system is usually of the high pressure type and consists primarily of a regenerative heat exchanger, a rotary pump, a post-cooler and a mixed bed filter.

In this case, the heat exchanger cools the water to be purified to a temperature acceptable for the mixed bed filter.

The purified water is heated again by a regenerative heat exchanger before being returned to the circuit.

Heat losses are thereby reduced.

Such purification devices are generally assembled from individual components, but this arrangement has the disadvantage that it requires a large amount of space, especially with regard to radiation and heat shielding, and is difficult to maintain.

Furthermore, this type of device is generally constructed such that the filter cannot be easily replaced.

The object of the invention is to provide a purification device with a small space requirement, especially for hot radioactive liquids, consisting of a regenerative heat exchanger, an aftercooler and a filter that can be replaced periodically.

According to the invention, this purpose is achieved by arranging a regenerative heat exchanger, an aftercooler and a filter in a cylindrical container in this order from bottom to top along the longitudinal axis of the container; This is achieved in that the annular space between the filter and aftercooler and the inner wall of the cylindrical vessel is formed as a return path for the medium to the regenerative heat exchanger.

With this arrangement, the temperature-sensitive filter is generally sufficiently separated from the hot medium so that even small leaks inside the purifier will not damage the filter.

Furthermore, the lower hot parts of the purification device can be shielded particularly well, while the upper cold parts of the purification device can be accessed by people.

Furthermore, according to the invention, the filter is arranged in an easily removable loading body.

In this way, the filter can be replaced by remote control.

It is also possible to flush out the used filter material via a separate conduit.

Furthermore, according to the invention, two flow-separated spaces, in particular two concentrically arranged spaces, are provided in the area of the aftercooler and the filter.

In this way, the medium to be purified can, for example, flow upwardly through the inner annular chamber and downwardly through the outer annular chamber.

Preferably, the cold medium flows outside to reduce heat loss to the outside.

In addition, in this case, a certain level of liquid tightness within the purifying device is not a big problem, so its manufacture is simple.

For purification devices requiring a rotary pump, according to the invention, this rotary pump is placed between the regenerative heat exchanger and the aftercooler.

In this way, the pump operates in an already cooled location, and the pump casing is simultaneously used as a six-tube for an aftercooler, preferably made of corrugated tubes.

It is obvious that the drive shaft of the pump can protrude upward from the pump casing, but in many cases the
It is preferable to arrange a liquid-tight, fully enclosed electric motor inside the tube.

The present invention will be explained in detail below with reference to embodiments shown in the drawings.

In FIG. 1, 1 is a vertical cylindrical container whose lower end is closed with an inlet lid 2 and whose upper end is closed with a filter lid 3. In FIG.

The vessel 1 has a regenerative heat exchanger 4, which is attached at its lower end to a tube sheet 5 and at its upper end to a tube sheet 6, and further has a plurality of commutation plates 7.8. It is made up of many parallel tubes.

The vessel 1 is located in the upper part of the tube plate 6 and has an inner chamber 9 through which the upward flow flows.
It is divided into a ring-shaped chamber 10 through which the flow flows downward.

In the inner chamber 9, below the aftercooler 11, there is a rotary pump 12, which is driven by a liquid-tight electric motor 13.

The rotary pump 12 and the electric motor 13 can be taken out upwards independently of the aftercooler 11.

The aftercooler 11 consists of a number of coiled tubes connected in parallel, which are wound around the casing of the electric motor 13, the ends of which are connected to small tube sheets 14, located at the cooling water inlet and the cooling water outlet. 15 respectively.

These tube sheets 14, 15 are each mounted fluid-tightly in special telescoping tubes 16, 17, taking into account thermal stresses and fluid-tightness.

In the upper part of the purification device there is a removable load (filter) 18 arranged concentrically with respect to the electric motor 13, which contains, for example, an ion exchange resin.

In this embodiment, the filter 18 is flowed through with an upward flow.

If the filter technology favors flow down and through the filter, the filter can be moved to the outside with little expense, and the link chambers freed up accordingly can also be moved to the inside.

The filter lid 3 at the upper end of the purification device is provided with another lid 19, which has a liquid-tight terminal 2 for power supply to the electric motor 13.
It has 0.

21 is a heat shield which surrounds only the lower part of the purifier and does not need to be removed during normal repair or filter replacement operations.

FIG. 2 is a block diagram showing the connections of the purifying apparatus of the present invention shown in FIG.

22 is a pressure vessel of a nuclear reactor, and the cooling water to be purified is taken out from the bottom of this pressure vessel 22 and reintroduced from above.

This cooling water first flows through the regenerative heat exchanger 4 , after which it is sucked out by the rotary pump 12 and pumped through the aftercooler 11 to the filter 18 .

The purified water is led from the filter 18 through the regenerative heat exchanger 4 to the pressure vessel 22 again.

A cooling water circuit is schematically shown in the aftercooler 11 .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a purification device based on the present invention, and FIG. 2 is a schematic block diagram of the purification device of FIG. 1. 1... Cylindrical container, 4... Regenerative heat exchanger quantity cooler,
18...filter. 1...after

Claims (1)

[Scope of utility model registration request] A regenerative heat exchanger inserted into the circulation circuit of the liquid medium to pre-cool the medium, a post-cooler and a filter, the medium is cooled in the post-cooler to an acceptable temperature for the filter, and filtered by the filter. In the purification apparatus, the regenerated heat exchanger 4, a postcooler, and a filter are arranged in one vertical cylindrical container, and the regenerated heat exchanger 4,
A postcooler 11 and a filter 18 are arranged in the cylindrical container 1 along the longitudinal axis of the container in this order from bottom to top,
It is characterized in that the annular space 10 between the filter 1B arranged in the cylindrical container 1 and the aftercooler 11 and the inner wall of the cylindrical container 1 is formed as a return path for the medium to the regenerative heat exchanger 4. Purification equipment for water-cooled nuclear reactors.