Liquid purification or separation – Tangential flow or centrifugal fluid action
Patent
1988-11-21
1990-12-25
Spear, Frank
Liquid purification or separation
Tangential flow or centrifugal fluid action
554591, 209144, 209211, 2105123, B01D 1738
Patent
active
049800647
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to cyclone separators.
The invention has particular, but not exclusive, application in liquid-separators, particularly separators for separating oil and water from an oil-water mixture such as of the kind described in International Application No. PCT/AU83/00028, U.S. Pat. No. 4,464,264, U.S. Pat. No. 4,576,724 or U.S. Pat. No. 4,237,006.
SUMMARY OF THE INVENTION
According to the invention there is provided a cyclone separator having an elongate separating chamber extending from a larger diameter end to a smaller diameter end, and having an overflow outlet at the larger diameter end, an underflow outlet at the smaller diameter end and inlet means, for inlet of fluid to be separated to the separating chamber, at a lengthwise location at least adjacent the larger diameter end; wherein the underflow outlet leads to an axially extending end portion of the separator, through which, in use of the separator, outflow from the underflow outlet passes, said end portion extending from a smaller diameter end to a larger diameter end, the smaller diameter end of the end portion being closest to the larger diameter end of the separating chamber. Preferably, said end portion is of frustoconical form with conicity (half-angle) in the range 6.degree. to 20.degree., preferably 8.degree.. A restrictive choke may be provided downstream of the end portion and is in a generally frustoconical form decreasing in diameter away from the end portion.
BRIEF DESCRIPTION OF THE DRAWING
The invention is further described by way of example only with reference to the accompanying drawing, the single FIGURE of which is a cross sectional diagram of a cyclone separator constructed in accordance with the invention.
BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS
The exemplary cyclone separator shown comprises an outer casing 24 which defines an elongate separating chamber 24a therewithin. The separating chamber is axially symmetrical and of circular transverse cross section. Chamber 24a extends from a larger diameter end 10a of the separator to a smaller diameter end 10b of the separator. In this instance, the separating chamber defines a first portion 12 of cylindrical form, a second tapered portion 14, which tapered portion 14 in turn leads to a third portion 16 of cylindrical form. A tapered portion 12a extends between portions 12, 14. Portion 16 presents, at its end remote from portion 12, an underflow outlet 23. The portion 16 thence leads to an end portion 18 of the separator. The separating chamber 24a has an underflow outlet 23, for the denser fluid, this being located at the end of portion 16 remote from the larger diameter end 10a of the separator. The separating chamber 24a also has one or more tangential fluid inlets 26 positioned adjacent the larger diameter end of the separator and an axial overflow outlet 34 arranged at the larger diameter end (for outflow of the less dense of the components of the fluid to be separated)
The separator 10 is designed specifically, in this particular instance, for separation of oil from an oil-water mixture, the mixture being admitted via inlets 26, the separated water being taken off via outlet 23 and the separated oil being taken off via outlet 34. Separators of this or other type suitable for separating liquid components one from the other are generally designed to ensure relatively low shear stress within the liquid as it is moving within the separating chamber 24a. International Application PCT/AU83/00028, U.S. Pat. No. 4,464,264, Australian patent specification No. 84713/82 and U.S. Pat. No. 4,237,006 describe cyclone separators effective for separating oil from an oily water mixture where water predominates. These disclose particular configurations and dimensional constraints applicable to this type of separator. Generally these separators are characterized by having relatively long length to diameter ratio, for example the diameter d.sub.1 at the larger diameter end of the separator may be related to the overall length of the sep
REFERENCES:
patent: 3489286 (1970-01-01), Estabrook
patent: 3501014 (1970-03-01), Fitch et al.
patent: 3716137 (1973-02-01), Frykhult
patent: 4237006 (1980-12-01), Colman et al.
patent: 4464264 (1984-08-01), Carroll
patent: 4576724 (1986-03-01), Colman et al.
patent: 4820414 (1989-04-01), Carroll et al.
Conoco Specialty Products Inc.
Drodge Joseph
Holder John E.
Spear Frank
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