Liquid purification or separation – Tangential flow or centrifugal fluid action
Patent
1989-12-08
1992-04-28
Dawson, Robert A.
Liquid purification or separation
Tangential flow or centrifugal fluid action
209144, 209211, 210788, B01D 2126, B04C 306
Patent
active
051086085
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a cyclone separator.
Particularly, the invention is concerned with a cyclone separator having an axially extending elongate separating chamber with inlet means adjacent a first end thereof, for introducing liquid mixture thereinto with a tangential component of motion 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 more dense component of the mixture, and wherein the separating chamber is so configured as to in use cause the denser component to flow to a first outlet at a second end of the separating chamber opposite said first end.
U.S. Pat. Nos. 4,237,006 and 4,576,724 for example disclose separators of the above kind and wherein there is a further outlet arranged axially of the separator at said first end thereof. In use of a separator of this kind, the less dense component in the mixture, in the central core, is urged to flow axially of the separator to emerge from the separating chamber through the further outlet. The movement of the less dense component towards the further outlet arises because of a pressure differential existing along the central core. However, a difficulty is experienced in operating cyclone separators of this kind in that, under certain conditions, the fluid pressure applied to the central core of the less dense mixture component in the separating chamber is insufficient to at all points along the length thereof drive the less dense mixture component in that core to the further outlet. In that case, the less dense component in the core, at a location towards the first outlet, may tend to be driven out the first outlet with the more dense component thus reducing separating efficiency. This is significant particularly 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 first outlet. In such cases, occurrence of the phenomonen just described may render it impossible under some conditions to obtain a satisfactorily low oil level in the outlet water.
In my International application PCT/AU84/00195, there is described a cyclone separator of the type first above described, and also including the aforementioned further outlet, and also having a third outlet from the separating chamber located towards said second end of the separating chamber to in use receive flow of less dense component from a portion of the core which is located towards the second end of the separating chamber. The received less dense component is that which might be flowing in the core in the direction towards the second end of the separating chamber, instead of towards the further outlet.
It has now been found possible to provide an arrangement in which at least a portion of the less dense component in the aforementioned core is removed from the separating chamber via an outlet positioned as with the aforementioned third outlet, possibly dispensing with the further outlet adjacent the aforementioned first end of the separator, and providing an additional outlet adjacent the third outlet, for take off of portion of the mixture in the separating chamber adjacent the core or at the outer peripheral portion thereof, and for return of this to the separating chamber for further treatment.
More particularly, the invention provides a cyclone separator having an axially extending elongate separating chamber with inlet means adjacent a first end thereof for introducing liquid mixture thereinto with a tangential component of motion 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 more dense component of the mixture and wherein the separating chamber is so configured as to in use cause the more dense component to flow to a first outlet at a second end of the separating chamber opposite said first end, the separator further including second and third outlets disposed within the separating chamber, the se
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Conoco Specialty Products Inc.
Dawson Robert A.
Holder John E.
Kim: Sun
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