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Description
Description
Centrifuges are used in the dairy industry to harvest special products like okara of soy slurry,
precipitated casein and crystallized lactose. The disc bowl centrifugal clarifiers, however, are not suitable for these duties due to the high solids content of the feed.
A decanter centrifuge is a machine for continuous sedimentation of suspended solids from a liquid by the action of centrifugal force in an elongated rotating bowl. The characteristic which distinguishes the decanter from other types of centrifuge is that it is equipped with an axial screw conveyor for continuous unloading of separated solids from the rotor. The conveyor rotates in the same direction as the bowl but at a slightly different speed to give a "scrolling" effect.
Other characteristic features of the decanter include:
1. A slender conocylindrical bowl rotating about a horizontal axis,
2. Countercurrent flow with solids discharge from the narrow end and discharge of liquid phase from the wide end.
The function of the decanter centrifuge
The feed suspension is introduced through an inlet tube to the feed zone of the conveyor where it is accelerated and directed into the interior of the spinning rotor.
The solids, which must have a higher specific gravity than the liquid, settle out at the inner wall of the bowl almost instantaneously due to the intense centrifugal acceleration - normally in the range of 2 000 - 4 000 g -leaving a clear inner ring of liquid.
Continuous process
In a decanter centrifuge the three stages of the process - inflow, sedimentation into concentric layers and separate removal of the liquid and solid phases - proceed in a fully continuous flow.
Principal components
The principal components of a decanter centrifuge are the bowl, conveyor and gearbox (together comprising the rotor) and the frame with hood, collecting vessels, drive motor and belt transmission.
Centrifuges are used in the dairy industry to harvest special products like okara of soy slurry,
precipitated casein and crystallized lactose. The disc bowl centrifugal clarifiers, however, are not suitable for these duties due to the high solids content of the feed.
A decanter centrifuge is a machine for continuous sedimentation of suspended solids from a liquid by the action of centrifugal force in an elongated rotating bowl. The characteristic which distinguishes the decanter from other types of centrifuge is that it is equipped with an axial screw conveyor for continuous unloading of separated solids from the rotor. The conveyor rotates in the same direction as the bowl but at a slightly different speed to give a "scrolling" effect.
Other characteristic features of the decanter include:
1. A slender conocylindrical bowl rotating about a horizontal axis,
2. Countercurrent flow with solids discharge from the narrow end and discharge of liquid phase from the wide end.
The function of the decanter centrifuge
The feed suspension is introduced through an inlet tube to the feed zone of the conveyor where it is accelerated and directed into the interior of the spinning rotor.
The solids, which must have a higher specific gravity than the liquid, settle out at the inner wall of the bowl almost instantaneously due to the intense centrifugal acceleration - normally in the range of 2 000 - 4 000 g -leaving a clear inner ring of liquid.
Continuous process
In a decanter centrifuge the three stages of the process - inflow, sedimentation into concentric layers and separate removal of the liquid and solid phases - proceed in a fully continuous flow.
Principal components
The principal components of a decanter centrifuge are the bowl, conveyor and gearbox (together comprising the rotor) and the frame with hood, collecting vessels, drive motor and belt transmission.
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