Alfa Laval Patente

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A heat transfer plate (8, 8a, 8b), a cassette (57) and a heat exchanger (2) are provided. The heat transfer plate (8, 8a) comprises a heat transfer area (46) provided with a heat transfer corrugation pattern comprising tops (60) and bottoms (62). The heat transfer area (46) comprises at least first and second transverse fields (1, 3) arranged in succession along a longitudinal center axis (L) of the heat transfer plate and each extending from a first long side (7) to a second long side (9) of the heat transfer area (46). The first and second transverse fields (1, 3) are separated by a first transverse border area (11). The heat transfer plate (8, 8a, 8b) is characterized in that a first top pitch (TP1) between the tops (60) extending within the first transverse field (1), within a first transverse sub-field (1') of the first transverse field (1), differs from a second top pitch (TP2) between the tops (60) extending within the second transverse field (3), within a second transverse sub-field (3') of the second transverse field (3).

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The present invention provides a method (100) of operating a centrifugal separator (1) for separating at least one liquid phase and a sludge phase from a liquid feed mixture. The centrifugal separator (1) comprises a frame (2), a drive member (3) and a centrifuge bowl (5), wherein the drive member (3) is configured to rotate the centrifuge bowl (5) in relation to the frame (2) around an axis of rotation (X), and wherein centrifuge bowl (5) encloses a separation space (9a) and a sludge space (9b); wherein the separation space (9a) comprises a stack (10) of separation discs arranged coaxially around the axis of rotation (X) and wherein said sludge space (9b) is arranged radially outside said stack (10) of separation discs; wherein the centrifuge bowl (5) further comprises an inlet (14) for receiving the liquid feed mixture, at least one liquid outlet (6) for a separated liquid phase, and sludge outlets (17) for a separated sludge phase arranged at the periphery of the centrifuge bowl (5). The method (100) comprises a step a) of supplying (101) a liquid feed mixture to be separated to the inlet (11) of the centrifuge bowl (5), a step b) of determining (103) a particle flow rate of the liquid feed mixture being supplied in step a), a step c) of determining (104) a volume filled with particles within the centrifuge bowl (5) based on the measurements of step b), and a step d) of discharging (105) a sludge phase comprising said particles via said sludge outlets (17) based on the determination of step b), wherein the discharge is of a specific volume or at a specific time point.

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The present invention relates to a frame for a decanter centrifuge. The frame comprising two elongated box-shaped beams extending parallel relative to each other between a first end and a second end. Each box-shaped beam comprising at least two ground supports at a third position at a fourth position, respectively. The third position being located adjacent the first end and the fourth position being located adjacent the second end. Each box-shaped beam further comprising a C-shaped beam defining two horizontal flanges and a vertical web interconnecting the two horizonal flanges and a vertical plate interconnecting the two horizontal flanges opposite the vertical web. The reinforcement plates extending in the longitudinal direction between a third end and a fourth end. The third end and the fourth end being located between the first end and the second end.

The present invention relates to a circular base for a decanter centrifuge. The base accommodated at one longitudinal end of a rotatable bowl of the decanter centrifuge. The base defining an inner surface configured to face an inner space of the bowl, a radial direction extending outwardly from a centre point of the base and a longitudinal direction extending perpendicular to the radial direction. The base defining a first outlet passage extending through the base and a first outlet housing provided at the inner surface and protruding away in the longitudinal direction. The first outlet housing having a first outlet opening for receiving a light phase from the inner space. The first outlet opening comprising a first weir edge defining in normal use a level of a surface of the light phase in the inner space. The first outlet housing is rotatable around a first adjustment axis.

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A valve control device (1) for controlling operation of a valve actuator (2) configured to be connected to a valve member (3). The valve control device (1) being configured to be removably mounted on the valve actuator (2) and comprises: a position sensor (4) for detecting actuating position of the valve actuator (2) and outputting the detected position as a feedback signal; a memory device (7) for storing position data reflecting the feedback signal from the position sensor (4) at at least one actuating position of the valve actuator (2); and an electronic control unit (6) for controlling operation of the valve actuator (2) using the feedback signal from the position sensor (4) and the position data from the memory device (7); wherein the electronic control unit (6) is configured for automatically performing a reset of the position data of the memory device (7) as a result of the valve control device (1) becoming separated from, and/or assembled on, the valve actuator (2).

The disclosure relates to a disc arrangement (1) for a centrifugal separator, the disc arrangement (1) comprises: a truncated cone shaped top disc (4) comprising a top circumference (6), a base circumference, an outer conical surface (10) and an inner conical surface; a neck device (14) attached to the top circumference (6) of the top disc (4); and at least three wing elements (18) connected to the neck device (14). The wing elements (18) are configured to rest on and extend along the outer conical surface (10) of the top disc (4).

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The present invention provides a method (100) of operating a centrifugal separator (1). The centrifugal separator (1) comprises a centrifuge bowl (10) arranged to rotate around an axis of rotation (X) and in which the separation of a liquid mixture takes place and a drive member (4) configured to rotate the centrifuge bowl (10) around the axis of rotation (X) at a rotational speed. The centrifuge bowl (10) further comprises an inlet (11) for receiving the liquid mixture to be separated, at least one liquid outlet (12) for discharging a separated liquid phase and at least one sludge (14) outlet for discharging a separated sludge phase. The centrifugal separator (1) further comprises an intermittent discharge system (30) for intermittently opening and closing the at least one sludge outlet (14). The method (100) comprises the steps of a) rotating (101) the centrifuge bowl (10) at a first rotational speed S1; b) increasing (102) the rotational speed of the centrifuge bowl (10) to a second rotational speed S2 that is higher than said first rotational speed S1, and c) opening (103) the at least one sludge outlet (14) to discharge contents within the centrifuge bowl (10) during rotation at said second rotational speed S2.

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The present invention relates to a method of recovering a concentrated plant-based protein suspension, which comprises providing a plant-based protein suspension comprising suspended particles and providing a high-speed centrifugal separator (2) which comprises a frame (23), a drive member (29) and a centrifuge bowl (20). The drive member is configured to rotate the centrifuge bowl in relation to the frame around an axis of rotation. The centrifuge bowl encloses a separation space comprising a stack of separation discs, and comprises an inlet (8) for receiving the plant-based protein suspension, a liquid light phase outlet (4) for a separated liquid light phase and a liquid heavy phase outlet (3) for a separated liquid heavy phase. The liquid heavy phase outlet and/or light phase outlet is arranged in fluid connection with a liquid flow influencing means (6, 12). The method further comprises feeding the plant-based protein suspension to the inlet of the high-speed centrifugal separator, separating the plant-based protein suspension into a liquid light phase and a liquid heavy phase, which comprises the concentrated protein suspension. The method comprises removing the concentrated plant-based protein suspension as the liquid heavy phase through the heavy phase outlet by influencing the discharge flow by means of the liquid flow influencing means.

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The present invention relates to a method of producing a low-fat product from a starting material made of a fat and/or oil containing plant- or animal item. The method comprising the steps of providing the starting material at a temperature of at least 35°C and extracting a greater part of the extractable oil and/or fat originally contained in the plant or animal item from the starting material using a first decanter centrifuge. The first decanter centrifuge is thereby leaving a residue of solids and liquids. The residue is forming the low-fat product.

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