Liquid purification or separation – Gravitational separator – Superposed compartments or baffles – e.g. – parallel plate type
Patent
1981-05-28
1982-12-14
Castel, Benoit
Liquid purification or separation
Gravitational separator
Superposed compartments or baffles, e.g., parallel plate type
55440, B01D 2100
Patent
active
043637302
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a lamellar separator comprising elongate substantially planar lammelae extending substantially horizontally in their longitudinal direction, for vertically separating substantially horizontal flow passages for a liquid which is to be purified, said passages being inclined to the horizontal plane in their transverse direction, for gravitational removal from the lamellae of heavy and/or light pollutants separated from the liquid.
BACKGROUND ART
In lamellar separators, a main flow is taken in a path between lamellae, whereon suspended particles gravitationally separated from the main flow, as well as miscible liquids, are collected in the boundary layer adjacent the lamellar surfaces, from where they can slide away gravitationally from the lamellae without being essentially disturbed by the main flow. If the lamellae have substantial length in their inclined direction, there is a risk that the separated material in the boundary layer assumes such thickness that the main flow is disturbed, or that the latter once again entrains material from the boundary layer.
One ambition will therefore be to arrange the lamellae with small extension in the direction of inclination, simultaneously as the inclination is sufficiently large so that material transport in the boundary layer in the direction of inclination will be relatively rapid, while the vertical distance between adjacent lamellae will be as small as possible to minimize the length of the flow passages.
This would however result in that the lamellar stack obtained a very small width and large height, alternatively that the required lamellar pack must be formed from a plurality of such stacks, whereby baffle elements would need to be inserted between the stacks to prevent undesired flow patterns. Examples of such modus operandi are illustrated in the Swedish published application No. 7101307-2.
It will be understood, however, that in such apparatus it is not possible to afford vertical channels, which are difficult to disturb, for both light and heavy material which has left the lamellae, or alternatively that it would not be possible to prevent through flow between adjacent lamellar packs.
It is furthermore a known situation that lamellar packs for lamellar separators tend to get a very complicated structure, if subdivision of the flow paths into a plurality of parallel paths with small area is striven after.
PURPOSE
One purpose of the invention is, therefore, to propose a lamellar separator eliminating or reducing the disadvantages which are associated with structures already known. An object is thus to propose a lamellar pack with a structural fabrication which is very simple, and allows the simple manufacture of the elements incorporated as well as simple assembly of the elements to a finished pack. The invention furthermore has the object of providing a lamellar separator in which the tendency of separated material to collect on the lamellar surfaces is avoided, and which affords undisturbed vertical passages or channels for light and heavy separated pollutants.
SUMMARY OF THE INVENTION
The inventive lamellar separator includes a lamellar pack comprising elongate substantially planar lamellae extending substantially horizontally in their longitudinal direction for vertically defining substantially horizontal flow passages or channels for a liquid which is to be cleaned. The flow passages are inclined to the horizontal plane in their transverse direction for gravitational removal from the lamellae of heavy and/or light pollutants separated from the liquid. Distinguishing for the invention is that there are vertically oriented first sheets or plates made with a first corrugation in the vertical plane, the portions thereof which are oblique to the vertical plane form said lamellae. Vertically oriented second sheets or plates corrugated in the horizontal plane are disposed on either side of each first plate and in contact therewith.
In a preferred embodiment, the first and second plates are put together such t
REFERENCES:
patent: 344740 (1886-06-01), Howatson
patent: 3385439 (1968-05-01), Bach
patent: 3454165 (1969-07-01), Cornelissen
Castel Benoit
Cohen Sharon T.
Projectus Industriprodukter AB
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