Alfa Laval Patente

The present invention relates to a plate for a heat exchanger for heat exchange between a first medium and a second medium, the plate defines a heat transfer area comprising a corrugated heat transfer pattern of alternately arranged ridges and valleys. The heat transfer area defining a first heat exchange surface for the first medium and an opposite second heat exchange surface for the second medium. The first heat exchange surface defines a meandering flow path for the first medium The meandering flow path is divided into an upper flow channel extending transversally in an upper part of the first heat exchange surface, a lower flow channel transversally in a lower part of the first heat exchange surface and at least one intermediate flow channel extending transversally in an intermediate part of the first heat exchange surface between the upper flow channel and the lower flow channel.

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The present invention provides a method for determining if air is trapped within a centrifugal separator (100). The separator comprises a stationary frame (30), a rotatable assembly (101) and a drive unit (34) for rotating the rotatable assembly (101) relative the frame (30) around an axis of rotation (X); and further a feed inlet (20) for supply of a liquid mixture to be separated, a first liquid outlet (21) for discharge of a separated liquid phase and a second liquid outlet (22) for discharge of a heavy phase having a density that is higher than said liquid phase; wherein the rotatable assembly (101) comprises a rotor casing (2) enclosing a separation space (17) in which a stack (19) of separation discs is arranged to rotate around a vertical axis (X) of rotation. The method comprises the steps of a) closing one of the first (21) and second (22) liquid outlets and restricting the flow from the other outlet; b) supplying feed to the feed inlet (20) and measuring the flow to the feed inlet (20) and the flow from the restricted outlet (21,22); c) comparing the flow as a function of time between feed inlet (20) and the restricted outlet (21,22); and d) determining that air is trapped within the centrifugal separator (100) if the measured flow as a function of time flow deviates between feed inlet (20) and the restricted outlet (21,22).

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A centrifugal separator (100) is disclosed, comprising a rotatable part (110), a stationary part (120), and a seal arrangement (201, 202). The rotatable part is configured to be rotated relative to the stationary part to separate a feed mixture into at least a first fraction and a second fraction. The seal arrangement comprises a rotatable sealing member (210) comprising a first sealing surface (212), and a stationary sealing member (220) comprising a second sealing surface (222). The first sealing surface and the second sealing surface face each other to form a sealing interface between the stationary part and the rotatable part. At least one of the first and second sealing surfaces is textured with a plurality of depressions (230) for reducing a friction in the sealing interface.

The present invention provides a centrifugal separator (1) for separating at least one liquid phase from a liquid feed mixture. The separator (1) comprises a rotatable portion (10), a stationary portion (2) and a drive motor (4) arranged for rotating the rotatable portion (10) relative said stationary portion (2) around an axis of rotation (X). The rotatable portion (10) comprises a centrifuge bowl (10a) and a rotatable shaft (7) onto which said centrifuge bowl (10) is mounted. The centrifuge bowl (10a) comprises a separation space (9a), in which surface enlarging inserts (17) are arranged, an inlet (11) for supply of the liquid feed mixture, at least one liquid outlet (12, 13) for discharge of a separated liquid phase. Further, at least one bearing (5, 6) is mounted to the rotatable portion (10) to facilitate its rotation, wherein said at least one bearing (5,6) comprises a plurality of ceramic bearing elements (51).

The present invention provides a centrifugal separator (1) for separating at least one liquid phase from a liquid feed mixture. The separator is comprising a rotatable portion (10), a stationary portion (2) and a drive motor (4) arranged for rotating the rotatable portion (10) relative said stationary portion (2) around an axis of rotation (X). The rotatable portion (10) comprises a centrifuge bowl (10a) and a rotatable shaft (7) onto which said centrifuge bowl (10) is mounted. The centrifuge bowl (10a) comprises a separation space (9a), in which surface enlarging inserts (17) are arranged, an inlet (11) for supply of the liquid feed mixture, at least one liquid outlet (12, 13) for discharge of a separated liquid phase. At least one bearing (5, 6) is mounted to the rotatable portion (10) to facilitate its rotation, wherein said at least one bearing (5,6) is a grease-lubricated bearing.

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The present invention provides a system (1) for separating at least a first liquid phase from liquid feed mixture. The system (1) comprises a centrifugal separator (2), which comprises a centrifuge bowl (4) arranged to rotate around an axis of rotation (X) and in which the separation of the liquid feed mixture takes place, an inlet (90) for receiving said liquid feed mixture, and a first liquid outlet (22) for discharging the first liquid phase. The first liquid outlet (22) is hermetically sealed and free of any dedicated device for converting the kinetic energy of the first liquid phase into pressure flow of the first liquid phase. The system (1) further comprises a pressure generating device (73) for supplying the liquid feed mixture to the inlet (90) of the centrifugal separator (2), and the system (1) is configured such that the pressure generating device (73) is the major flow regulating device arranged for creating the required outlet pressure for transportation of the first liquid phase from the first liquid outlet (22).

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A heat exchanger plate (1) for a plate heat exchanger for heat exchange between at least a first fluid and a second fluid, the heat exchanger plate (1) having a quadrilateral shape with two opposite parallel primary sides (5) and two opposite parallel secondary sides (6), and a longitudinal central axis (x) being parallel with the primary sides (5). The heat exchanger plate (1) comprising a heat exchanging area having a corrugation of ridges and valleys having a longitudinal extension defining an inclination in relation to the longitudinal central axis (x), four portholes (11, 12, 13, 14), of which at least two are located at a respective corner of the heat exchanger plate (1) extending through the heat exchanger plate (1), a first set of ridges (8a) and valleys (9a) and a second set of ridges (8b) and valleys (9b), wherein the longitudinal extension of the first set of ridges and valleys (8a, 9a) define a first angle (α) in relation to a first primary side (5a) and the longitudinal extension of the second set of ridges and valleys (8b, 9b) define a second angle (β) in relation to a second primary side (5b), wherein an intersection between the first set of ridges and valleys (8a, 9a) and the second set of ridges and valleys (8b, 9b) being defined as a transition area (10) comprising a curvature of ridges and valleys being concentric with a porthole.

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A fuel supply system (10) is disclosed for supplying a methanol-based fuel from a fuel tank (12) to an internal combustion engine (14). The fuel supply system (10) comprises: a main fuel conduit (16), which fluidly connects the fuel tank (12) to the internal combustion engine (14); a first fuel pump (18), which is placed along the main fuel conduit (16) and which is designed for sucking fuel from the fuel tank (12) at a first pressure value (P1) and delivering the fuel along the main fuel conduit (16) at a second pressure value (P2), which is higher than the first pressure value (P1); a second fuel pump (20), which is placed along the main fuel conduit (16) downstream of the first fuel pump (18) and which is designed for receiving fuel from the first fuel pump (18) at the second pressure value (P2) and delivering the fuel along the main fuel conduit (16) at a third pressure value (P3), which is higher than the second pressure value (P2) and which is equal to the operative pressure value of the fuel required by the internal combustion engine (14); a heat exchanger device (22), which is placed along the main fuel conduit (16) and which is designed to exchange heat with the fuel to bring it to a temperature value within a predefined temperature range (ΔT), which is equal to the operative temperature range of the fuel required by the internal combustion engine (14); and a fuel filtering unit (24), which is placed along the main fuel conduit (16) downstream of the second fuel pump (20) and which is designed for filtering the fuel before being supplied to the internal combustion engine (14) at the third pressure value (P3) and within the predefined temperature range (ΔT).

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The present invention provides a method (100) of separating liquid feed mixture comprising yeast. The method comprises the steps of a) introducing (101) the liquid feed mixture into a centrifugal separator (1); b) continuously discharging (102) a separated liquid heavy phase comprising yeast from the centrifugal separator; c) continuously discharging (103) a separated liquid light phase from the centrifugal separator; and d) introducing (104) a portion of the separated liquid light phase into the separated liquid heavy phase comprising yeast; thereby decreasing the viscosity of the separated liquid heavy phase. The present invention further provides a separation system (90) for separating liquid feed mixture comprising yeast.

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