Liquid purification or separation – With precoat adding or applying means
Patent
1994-12-01
1996-07-09
Drodge, Joseph W.
Liquid purification or separation
With precoat adding or applying means
210291, 2103232, 210456, B01D 3702, B01D 2990
Patent
active
055341446
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a unit for treating liquid, comprising a suitably cylindrical container which, in a first, suitably upper chamber, has a set of comparatively slender tubes or ducts which the liquid is forced to pass on its way from an inlet in the container to an outlet, so as to be subjected to a treatment, such as deionisation, during this forced passage.
BACKGROUND OF THE INVENTION
Units of this type are used in the nuclear industry for cleaning the water to be taken into the reactor, more precisely by deionisation, primarily in respect of Fe ions but also by removal of undesirable pollutants. To this end, the slender treatment tubes are provided with perforations and surrounded by a cloth whose outside is coated with an ion-exchange medium. In actual practice, the treatment tubes are so mounted in an upper chamber as to be separate from an open, lower chamber, the treatment tubes being closed at the bottom and open at the top. Thus, water entering the tubes from outside will first penetrate the external layer of ion-exchange medium and then pass through the small perforations in the circumferential walls of the tubes, before discharging into the upper part of the container, where it is collected in a throughgoing outlet tube extending centrally through the lower, free chamber and out through the bottom of the container.
In prior-art units of this type, the inlet consists of a tube which opens directly into the lower chamber of the container, more precisely in the cylindrical wall, with the tube projecting radially therefrom. One problem which is difficult to master in these known units is that the flow velocity of the water becomes extremely uneven outside the separate treatment tubes owing to uncontrolled turbulence in the lower chamber. Thus, the velocity of the water flowing past the treatment tubes can be extremely high at some tubes while being comparatively low at others. Where the water passes at a high speed, the ion-exchange medium on the tubes is quickly eroded, which shortens the time of operation elapsing between the required restorations of the medium. These restorations being troublesome and time-consuming operations, the too short times of operation therebetween will detract from cost-effectiveness.
SUMMARY OF THE INVENTION
This invention aims at remedying the above-mentioned shortcomings of prior-art units of this type and providing a unit which is capable of long-term operation without there being any need of restoring or replacing the ion-exchange medium. Thus, a basic object of the invention is to provide a unit in which the water flow outside the treatment tubes is even, there being but small variations between the highest and lowest velocity of the flow in the entire set of tubes. Another object of the invention is not only to ensure an even flow of liquid via the treatment tubes in new units, but also to enable modifications of existing units to this very end by using comparatively simple means.
Accordingly, the present invention provides a unit operable for treating a liquid, including a container having an inlet and an outlet and having an upper chamber with a plurality of tubes or ducts, having a liquid treatment medium associated therewith, through which the liquid is forced to pass en route from the inlet of the container to the outlet. A lower chamber includes a liquid-distributing annular casing, with the casing having inner and outer sidewalls sealingly interconnected along an edge portion therein and interconnected by at least one transverse wall. The at least one transverse wall is opposite to the edge portion and includes a plurality of apertures, operable for directing the liquid in the form of a large number of separate jets. A cross-sectional area of the liquid-distributing casing continuously decreases from one end close to the inlet towards an opposite end. A deflection means is substantially centrally located in the second chamber for deflecting and guiding liquid flowing inwardly from the liquid-distributing casing in a con
REFERENCES:
patent: 4283282 (1981-08-01), Saint-Dizier et al.
patent: 5128038 (1992-07-01), Slavitschek et al.
Hemstrom Bengt
Karlsson Rolf
Persson Johan
Drodge Joseph W.
Vattenfall Utveckling AB
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