Continuous discharge machines

1) Solids collector 4) feed pipe 6) slotted screen 8) pusher plate  

Factors wludi influence coitrifuge selection include [Quilter, 1982]  

1) Type of separation required liquid-solid, liquid-liquid-solid 

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Typical example of continuous, solids-discharge machines are shown in Figure 50.20, which depicts pusher centrifuges. Both single-stage and multi-stage rotors may be employed. In these units, the slurry is... 

The concept of continuous mixing is based on the idea of mixing rubbers, powders, oils, etc., in a continuously fed and discharged machine which has a steady electrical load and is operating at a steady temperature, so the heat transfer capability of the machine is used efficiently. A batch mixer is empty and unloaded 10-30% of the time and the heat transfer is only used 50% of the time. 

Decanter centrifuges, for process applications, are typically solid bowl scroll-discharge machines, capable of continuous sohd and centrate discharge. They are ideally suited to handling high feed solids concentrations and delivering dry solid products. They are generally able to convey the soft solids often encountered in the pharmaceutical and fermentation industries. 

The disc-stack centrifuge with continuous solids discharge is called a nozzle discharge machine. The special nozzles mounted in the periphery of the bowl allow for continuous operation with a liquid-Uqnid-soUd feed, separating this mixture into two relatively clean liquid streams and a thick solids suspension. The concentration of this solids discharge can be controlled to meet process requirements. 

In general, soHds-retaining batch and batch automatic machines are limited to low feed concentrations to minimize the time required to unload the soHds. Continuous disk centrifuges can have higher feed concentration. The limit is the underflow concentration. Conveyor discharge centrifuges can handle high feed concentration and are limited only by the volume of soHds displacement, or torque capacity. 

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