Liquid purification or separation – Tangential flow or centrifugal fluid action
Patent
1985-08-26
1989-04-11
Sever, Frank
Liquid purification or separation
Tangential flow or centrifugal fluid action
209144, 209211, B01D 17038
Patent
active
048204145
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a cyclone separator.
In one aspect the present invention relates to a cyclone separator having an elongate separating chamber with means for tangentially introducing liquid mixture thereinto so that a less dense component of the mixture tends to form a lengthwise extending central core in the separating chamber, said core being surrounded by a denser component of the mixture and wherein the separating chamber is so configured as to cause the less dense component in at least an end part of said central core to be urged to flow in a first direction to a first outlet of the separating chamber, at an end of the separating chamber adjacent said inlet means, and whereby the denser component is urged to flow in an opposite direction to a second outlet at the end of the separating chamber opposite said first outlet.
The movement of the less dense component towards the first outlet arises because of pressure differential along the central core. However, a difficulty is experienced in operating cyclone separators of the above kind under certain conditions where the fluid pressure applied to the central core of the less dense mixture component in the separating chamber is insufficient to all points along the length thereof to drive the less dense mixture component in that core to the first outlet. In that case, the less dense component in the core, at a location towards the second outlet, may tend to be driven out the second outlet with the more dense component, thus reducing separating efficiency. This is particularly significant in cases where it is desirable to remove oil from an oily water mixture and where the desired end result is to achieve a clean water flow from the second outlet. Occurrence of the phenomena just described may be sufficient to render it impossible under some conditions to obtain a satisfactory low oil level in the outlet water.
According to the present invention a cyclone separator as above described is characterised by the provision of a third outlet from said separating chamber and located towards said opposite end of said separating chamber to in use receive flow of said less dense component, in said opposite direction, from a portion of said core remote from said end part thereof. The third outlet may conveniently be formed in a duct, coaxially arranged within said separating chamber adjacent said second outlet, such as coaxially therewithin, and extending from said second outlet a predetermined distance towards said first outlet.
In order to assist movement of less dense component through said third outlet, the third outlet may be provided with means for applying a reduced pressure thereat. In any event, a return duct may be provided for returning flow to the separating chamber such as adjacent to the first outlet.
The separating chamber may include first, second, and third coaxially arranged cylinder portions arranged in that order from the first outlet to the second outlet, with the inlet means provided at the first portion. These portions may be of decreasing cross sectional size, from the first to the second to the third such portion. The portions of the cyclone separator may not be truly cylindrical, in the sense that they do not need in all cases to present a side surface which is linear in cross-section and parallel to the axis thereof. The first cylindrical portion may have a frustoconical section adjacent the second cylindrical portion and which provides a taper between the largest diameter of the first cylindrical portion and the diameter of the second cylindrical portion where this meets the first cylindrical portion. A similar section of frustoconical form may be provided to cause a tapering in the diameter of the second cylindrical portion from a largest diameter of the second cylindrical portion to the diameter of the third cylindrical portion. The second cylindrical portion may also exhibit a constant taper over its whole length. A fourth portion may also be added adjacent the third portion.
The invention is further described by way of example on
REFERENCES:
patent: 2538870 (1951-01-01), Hunter
patent: 4237006 (1980-12-01), Colman et al.
patent: 4578199 (1986-03-01), Peel et al.
Carroll Noel
Prendergast Gavan J. J.
Carroll Noel
Sever Frank
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