DK200400388A - Centrifuge for separating an infused liquid comprising an emulsion of two liquid phases having different densities in a light liquid phase and a heavy liquid phase - Google Patents

Abstract

The centrifuge comprises an elongated drum (1) with an inlet (3) for the supply of an emulsion of liquid phases to a separation chamber (2) and a first and second outlet (4 and 5) from the separation chamber (2) for a light and a heavy liquid phase, respectively. Several barrier plates (6, 9, 10) are arranged for guiding the flow of liquid from the inlet (3) to the outlets (4, 5), which barrier plates (6, 9, 10) have respective overflow and/or underflow edges at different radial distances from the rotational axis (CL) and provide a first, second and third separation area (8, 11, 14) between the inlet (3) and the outlet (4) for the light liquid phase. The arrangement of the barrier plates contributes to prevent re-mixing of an already separated emulsion.

Description

A centrifuge for separating an infused liquid comprising an emulsion of two liquid phases having different densities in a light liquid phase and a heavy liquid phase comprising an elongated drum (1) arranged to rotate about its longitudinal axis (CL) with a substantially cylindrical separation chamber (2) having an inlet (3) for supplying liquid to the separation chamber (2), a first and a second outlet (4 and 5) from the separation chamber (2) for the light and heavy liquid phase, respectively, where the outlet (4) for the light liquid phase is arranged at a first radial distance (R 1) from the longitudinal or rotational axis (CL), and the outlet (5) for the heavy liquid phase is arranged at a second, larger radial distance (R 2) from the axis of rotation (Cl), and wherein in the separating chamber (2) between inlets {3) and outlets (4 and 5) there are arranged several blocking plates (6, 9, 10) with radial extension for guiding the flow of liquid from inlet to outlet, which blocking plates have respective surfaces. age and / or underflow edges at different radial distances from the axis of rotation (C1), wherein a first locking plate (6) extends from a level above, or closer to the axis of rotation (CL) than, the highest filling level (R0) for liquid in the separation chamber (2) and to a third radial distance (R3) from the axis of rotation (CL), which third radial distance (R3) is less than the distance from the axis of rotation (CL) to the inner wall (7) of the drum in the separation chamber (2) and greater than the second radial distance (R2), to define a first separation region (8) in the separation chamber, in which first separation region (8) opens the inlet (3), the first locking plate (6) defining the distance from the axis of rotation (CL) for operation of the centrifuge. a light and heavy liquid phase separator (12) in the separation chamber (2), and a second barrier plate (9) disposed relative to the flow between the first barrier plate (6) and the discharge fluid (5) seeing and having an inlet edge at a fourth radial distance (R4) from the axis of rotation greater than the second radial distance (R2) to force the heavy liquid phase to pass the fourth radial distance (R4) before reaching its outlet (5); characterized in that a third barrier plate (10) between the first barrier plate (6) and the light liquid phase outlet (4) extends from a fifth radial distance (R5) from the axis of rotation less than the first radial distance (Ri) but greater than the radius of the highest filling level (R0), to a sixth radial distance (Rg) from the axis of rotation greater than the third radial distance (R3), whereby the third latch plate (10) and the first latch plate (6) defines a second separation region (11) in the separation chamber (2) and the outlet (4) for the light liquid phase is arranged downstream of the third barrier plate (9) from a third separation region (14) in the separation chamber (2). Centrifuge according to claim 1, characterized in that the inlet (3) is located at one end of the separation chamber (2). Centrifuge according to claim 1 or 2, characterized in that the outlets (4, 5) are located at the other end of the separation chamber (2). Centrifuge according to one of claims 1 to 3, characterized by a coaxial elongated central body (16) containing the inlet (3) and carrying a conveyor screw (17) in the separation chamber (2). ) for transporting a heavy, relatively solid phase (18) toward a third outlet (19). Centrifuge according to claim 4, characterized in that the body (16) carries a baffle (20, 20 ') between the inlet (3) and the third outlet (19), which baffle (20, 20') spans the space between two adjacent auger windings, blocking off a portion of this gap as it extends from the body (16) to a seventh radial distance (R7) from the axis of rotation (CL) extending over the entire baffle (20, 20 ') thereof. one to the other snail winding is greater than the third radial distance (R3). Centrifuge according to one of claims 1-5, characterized in that the blocking plates (6, 9, 10) are substantially unperforated. Centrifuge according to one of claims 4 to 6, characterized in that the first locking plate (6) ends close to the body (16). Centrifuge according to one of claims 1 to 7, characterized in that a friction surface element (22) is provided along at least part of the flow path of the emulsion to provide a larger friction area. Centrifuge according to claim 8, characterized in that the friction surface element (22) is provided in the first and / or second separation region (8; 11).