Distillation: apparatus – Apparatus – Systems
Patent
1981-11-19
1983-07-05
Sever, Frank
Distillation: apparatus
Apparatus
Systems
55158, 159 17R, 159DIG27, 202235, 202236, B01D 302
Patent
active
043916767
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to an arrangement for permitting a first liquid to flow close to a second liquid, but without being mixed therewith, in order, for example, to recover freshwater by distillation of sea water or to transfer heat from a relatively hot liquid to a relatively cold liquid. The arrangement is of a kind which comprises a first number of plates intended for the first liquid, and a second number of plates intended for the second liquid, which are located between, but separated from plates in the first number of plates. All plates are well separated from each other by means of special separating pieces located between each two of said plates.
PRIOR ART
It is previously known to recover freshwater from sea water by low-temperature distillation, see e.g. SE-PS No. 387 927, in which an arrangement is disclosed which comprises a plurality of plane-parallel plates, in every second one of which relatively cold freshwater flows and in every other second one of which relatively warm, solar-heated sea water flows.
It is necessary that the plates with sea water and, respectively, freshwater flow therein are separated from each other, in order to prevent intermixing of the two flows. The said patent specification describes distance members, which consist of grooves turned upside down, and it also describes special means for distributing the liquids to the different plates and corresponding collecting means.
The object of the present invention is to provide devices of the aforementioned kind but so modified that a higher efficiency is achieved through a simplified and more compact construction.
SUMMARY OF THE INVENTION
The invention relates to a special design of said separating pieces, in such a manner, that each of the pieces comprises an outer porous hydrophobic plastic diaphragm, the voids of which have such a radius that at the hydrostatic pressures prevailing in the arrangement liquid water passage through the plastic diaphragm is prevented, while passage of water vapour is rendered possible; an intermediate distance network of plastic and an outer thin plastic foil, all clamped in a frame, which in its upper portion is provided with inlet apertures for air and in its lower portion with outlet apertures for water.
The invention also relates to a special design of the two numbers of plates, in such a manner, that they are adapted together with the separating pieces to be assembled to one unit, which is provided with separate inflow and outflow means for the two liquids.
The characterizing features of an arrangement according to the invention are apparent from the attached claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in greater detail with reference to the accompanying drawings, in which
FIG. 1 schematically shows the location of plates and separating pieces relative to each other and supply and discharge means,
FIG. 2 is a sectional lateral view of a separating piece,
FIG. 3 is a front view of a portion of a distance network comprised in a separating piece, and
FIGS. 4, 5, 6 are front views of the frame configuration of a separating piece, of a plate in a first number of plates and of a plate in a second number of plates.
The arrangement according to FIG. 1 comprises a plurality of plates prior in their mechanical assembly to one unit. An outer plate 10 includes a first supply means 101, a second supply means 103, a first discharge means 104 and a second discharge means 102. A second outer plate 14 includes corresponding supply means 141,143 and discharge means 144,142. Between said outer plates a first plurality of plates 11, a second plurality of plates 12 and separating pieces 13 are located. The drawing shows only one plate 11, one plate 12 and one separating piece 13, but in reality there are a great number of plates 11 that are spaced from an equal number of tightly abutting plates 12 by means of separating pieces 13, the plates being interleaved one another.
As appears in FIG. 2, a separating piece 13 comprises a frame 130 receiving
REFERENCES:
patent: 3797202 (1974-03-01), Nevlander et al.
patent: 4265713 (1981-05-01), Cheng
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