Liquid purification or separation – With gas-liquid surface contact means – With separator
Patent
1993-09-21
1995-02-21
Upton, Christopher
Liquid purification or separation
With gas-liquid surface contact means
With separator
2101953, 210202, 2105121, 210618, C02F 306, B01D 4300
Patent
active
053912942
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a particle separator device with fluid circulation, with double effect of extraction, and more particularly to a device intended for separating from a liquid particles in suspension therein. The present invention also relates to a process and a device for purifying a liquid to be treated biologically, employing such a particle separator.
Different types of separators are known which, for the majority, subject a fluid to be treated to an eddying movement of "vortex" type, in an enclosure of generally truncated shape, in which the particles are entrained by the fluid in movement towards the apex of the frustum of cone located at the base of the apparatus, in order then to be received in a retention chamber. Patent FR-A-2 205 369 describes such a separator in which the fluid in movement located on the outer periphery of the vortex is entrained in the retention tank.
Although the separator devices of this type ensure separation by centrifugation of the largest particles to bring them to the periphery of the eddy, their extraction, i.e. their separation from a liquid medium, is effected only partially, since the eddying movement of the liquid continues in the retention chamber, which prevents them from precipitating easily in the bottom thereof. Such devices are therefore not efficient.
The present invention has for its object to propose a particle separator which makes it possible to extract the solid particles brought to the periphery of the eddy and to cause them then to be deposited in a retention chamber, whilst avoiding mixing the liquid treated with the slurries constituting the residues of the prior treatment of the liquid.
The present invention also has for its object a separator making it possible to create, at the centre of a descending principal eddying movement, an ascending secondary eddying movement which ensures a second centrifugal separation of solid particles remaining in suspension in the liquid after the first separation, this second separation being followed by an extraction which is ensured by the principal eddying movement.
The present invention also has for its object to propose means for facilitating the formation of the ascending secondary eddy.
The present invention thus has for an object a device for separating particles contained in a liquid to be treated, comprising a cylindrical enclosure, closed at its upper end, this latter being provided with means for injecting the liquid to be treated, oriented tangentially with respect to the inner wall of the enclosure, so as to create therein a descending forced eddying flow, said enclosure comprising, at its base, an annular channel delimited by the lower face of the cylindrical enclosure and a central deflector core intended to ensure evacuation of the particles contained in the fluid to be treated, and a retention chamber, adapted to collect said particles, the deflector core generating an ascending central eddying flow of treated fluid, an axial outlet tube being provided in the upper part of the enclosure to ensure evacuation of the axial column of treated fluid from the enclosure, characterized in that the deflector core is constituted by a deflector plate comprising at least one plane central part, this plate comprising means for adjusting its longitudinal position, making it possible to modify and adjust the value of the section of passage of said annular channel, and in that the axial outlet tube is extended downwardly by a flux regulating element constituted, from upstream to downstream, by a downwardly widening truncated part, extended by a cylindrical part with an outer diameter less than the inner diameter of the cylindrical enclosure so as to create therebetween a flux regulating flow stream of annular section.
In an embodiment of the invention, the quality of the flow of the principal eddy is improved by giving the annular space included between the inner wall of the cylindrical enclosure and the outer wall of the flux regulating element, a width substantially equal to one third of the inner
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Codiex (S.N.C.)
Upton Christopher
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