Alfa Laval Patente

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The disclosure concerns a modular centrifugal separator system (1) configured for separating a liquid feed mixture into a heavy phase and light phase. The system comprises a base unit (4) and a set of a first and a second exchangeable separation inserts (6, 6'). The base unit (4) comprises a stationary frame (8) and a rotatable member (16). The rotatable member (16) delimits an inner space (26) configured for receiving at least one part of the first or second exchangeable separation insert (6, 6') therein. Each of the first and second exchangeable separation inserts (6, 6') comprises a rotor casing (82) forming a separation space (88) and frustoconical separation discs (92) arranged in the separation space (88). The discs (92) of the first exchangeable separation insert have a first area equivalent and the discs (92) of the second exchangeable separation insert have a second area equivalent, which differs from the first area equivalent.

A heat transfer plate (2a, 2d) is provided. It comprises an upper end portion (8), a center portion (24) and a lower end portion (16). The upper end portion (8) adjoins the center portion (24) along an upper borderline (30) and comprises a first and a second port hole (10, 12) and an upper distribution area (14) provided with an upper distribution pattern. The upper distribution pattern comprises elongate upper distribution ridges (50u), a respective top portion (50ut) of the upper distribution ridges (50u) extending in an imaginary upper plane (38) and having a rounded first, a rounded second, a rounded third and a rounded fourth corner (64, 66, 68, 70). The upper distribution ridges (50u) longitudinally extend along a plurality of separated imaginary upper ridge lines (54u) extending from the upper borderline (30) towards the first port hole (10). The heat transfer plate is characterized in that, for each of a first number > 1 of the upper distribution ridges extending along a top upper ridge line (54TR) of the upper ridge lines (54u), which top upper ridge line (54TR) is arranged closest to the second porthole (12), a curvature radius of the first corner (64) of the top portion (50ut) is larger than a curvature radius of the second corner (66) of the top portion (50ut). The first and second corners (64, 66) are arranged on opposite sides of the top upper ridge line (54TR), the second corner (66) is arranged closer to the second porthole (12) than the first corner (64), and the first and third corners are arranged on the same side of the top upper ridge line.

A heat transfer plate (2a, 2d) is provided. It comprises an upper end portion (8), a center portion (24) and a lower end portion (16). The upper end portion (8) adjoins the center portion (24) along an upper border line (30) and comprises a first and a second port hole (10, 12) and an upper distribution area (14) provided with an upper distribution pattern. The upper distribution pattern comprises upper distribution ridges (50u) and upper distribution valleys (52u). The upper distribution ridges (50u) longitudinally extend along a plurality of separated imaginary upper ridge lines (54u) extending from the upper border line (30) towards the first port hole (10). The upper distribution valleys (52u) longitudinally extending along a plurality of separated imaginary upper valley lines (56u) extending from the upper border line (30) towards the second port hole (12). The imaginary upper ridge lines (54u) cross the imaginary upper valley lines (56u) in a plurality of upper cross points (55). In a plurality of the upper cross points (55) the heat transfer plate (2a, 2d) extends in an imaginary first intermediate plane (41). The heat transfer plate is characterized in that it, in a number of first upper cross points (55c) of the upper cross points (55) arranged on one side of the longitudinal center axis (L), extends above the first intermediate plane (41), in a number of second upper cross points (55b) of the upper cross points (55) arranged on another side of the longitudinal center axis (L), extends below the first intermediate plane (41).

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The present invention provides a centrifugal separator (1) for separating at least one liquid phase from a liquid feed mixture. The separator comprises a centrifuge bowl (10) and arranged for rotation around an axis of rotation (X);a distributor (13) which divides the centrifuge bowl (10) interior into a central inlet chamber (32) and an annular separation space (12); wherein said separation space (12) comprises a stack (20) of separation discs arranged coaxially around the axis of rotation (X); an inlet (30) formed by a stationary inlet pipe (31) and the central inlet chamber (32), wherein the stationary inlet pipe (31) meets the centrifuge bowl (10) axially from the top and is arranged for supplying the liquid feed mixture to the central inlet chamber (32). The separator further comprises a first liquid outlet (40) for a separated liquid light phase arranged at the top of the centrifuge bowl (10) at radius that is larger than the radius of the stationary inlet pipe (31) and a first stationary outlet pipe (41) for receiving the separated liquid light phase from the first liquid outlet (40). The inlet is a hermetic inlet and the first stationary outlet pipe (41) is hermetically sealed to the centrifuge bowl (10). The centrifugal separator (1) further comprises a gap (60) which the first liquid outlet (40) or the first stationary outlet pipe (41) to the inlet (30), wherein said gap (60) has an axial width that is more than 0.1 mm and is arranged for providing a leakage of separated liquid light phase from the first liquid outlet (40) or the first stationary outlet pipe (41) to the inlet (30) during operation of the centrifugal separator.

The disclosure concerns a method for separating an oil-containing aqueous liquid mixture having an oil content of ≤ 5% into an aqueous heavy phase and a light phase in a separation system (32). The method comprises:- conducting the liquid mixture from a tank (34) via an inlet conduit (36) to an inlet passage (22) of a centrifugal separator (2),- separating the liquid mixture into the aqueous heavy phase and the light phase in the centrifugal separator (2),- determining an oil concentration parameter of the light phase, andin response to the oil concentration parameter exceeding a threshold,- conducting the light phase from a light phase outlet passage (24) to a container (38) for light phase, and in response to the oil concentration parameter falling below the threshold,- recirculating the light phase from the light phase outlet passage (24) to the inlet passage (22).

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