Liquid purification or separation – Tangential flow or centrifugal fluid action – With movable means affecting flow
Patent
1993-10-08
1995-10-10
Dawson, Robert A.
Liquid purification or separation
Tangential flow or centrifugal fluid action
With movable means affecting flow
2105121, 210787, 210521, 210523, B01D 2126
Patent
active
054568382
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a liquid separator and particularly a separator for separating a liquid having low density from water. It is not limited to liquids only, as it will also separate out substances and particles that have low density in relation to water.
In connection with increased oil extraction offshore, and increasing transport of oil by ship, there is a steadily growing risk of oil spills into the water. To collect up oil from water, the oil must first be concentrated and confined, and this is normally done with the aid of oil booms. Then, known equipment such as skimmers, mops, etc., is used to transport oil mixed with water from this enclosure to the collection site. The mixture may then be subjected to further separation as required, in accordance with several known methods. There exist a number of separator systems with a high degree of efficiency for oil/water of both high and low concentrations. Several of the systems, which are sensitive with regard to solid matter, are based on high technology, are costly, and are poorly suited for the first phase of separation of oil from water in major oil spills. The present invention is based on new principles, is robust and is not particularly vulnerable to solid matter. It would be capable of separating oil from water in both large and small concentrations, and is therefore not dependent on oil booms for concentrating the oil prior to collection. The separator may placed conveniently in ships which draw in large amounts of water mixed with oil without major preparation as with use of booms, skimmers, etc.
The purpose of the present invention is to provide a separator having excellent separation properties for two or more substances of different densities, at least one of which is a liquid, where the concentration of one of the liquids is very small, for example, in cases of major oil spills at sea.
This is achieved with a separation assembly according to the invention consisting of a preferably cylindrical housing having a tangential inlet at the upper end and an outlet at the lower end thereof, where there are centrally disposed within the housing a plurality of vertically spaced plate members in the form of a truncated cone with the open vertex oriented upward; the uppermost plate member being connected to a transport line for the liquid having lowest density. The invention is also characterized in that the housing is provided, between the inlet and the outlet thereof, with at least one annular expanded area provided with one or more current generators.
A preferred embodiment form of the invention will now be described in more detail with reference to the accompanying drawings.
FIG. 1 shows a vertical section through a separator in accordance with the invention, seen from the side.
FIG. 2 shows a horizontal section through the separator along line A--A in FIG. 1.
FIG. 3 shows a horizontal section through the separator along line B--B in FIG. 1.
FIG. 4 shows a horizontal section through the separator along line C--C in FIG. 1.
FIG. 1 shows a section through the separator consisting of a top plate 2, a cylinder 7, which is encircled by a larger annular channel 9 and the bottom 12. In the center of the separator are mounted a plurality of truncated conical plates 3, which expediently are fastened to the main structure of the separator. The diameter of the conical plates 3 is somewhat smaller than the interior diameter of cylinder 7. Within the annular channel 9 is mounted a current generator 13 (shown here as a propeller), which is driven by motor 15. The channel 9 is additionally provided with suitable current stabilizers 14, according to need.
The mixture, preferably oil and water, enters tangentially at the top of the separator at inlet 1 so as to be set into rotation within the separator's cylinder 7. The mixture then flows down along the walls of cylinder 7. Due to the action of centrifugal force on the mixture as a consequence of the rotation, the liquid having lowest density (oil) will be drawn in toward the center of cylinder 7, whil
REFERENCES:
patent: 1709971 (1929-04-01), Coe
patent: 3849310 (1974-11-01), Condolios et al.
patent: 3849311 (1974-11-01), Jakubek
patent: 3915858 (1975-10-01), Condolios
PTO 95-465, English Translation of Germany, OLS No. 25 07 190 Edvarson, Mar. 1946.
US PTO 95-602 English Translation of SE 116439 Grantz et al., Sep. 1976.
Dawson Robert A.
Reifsnyder David
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