Exit scroll

Pressure-recovery type vortex tubes, along with pressure-recovery type diffusers set atop the roof of the cyclone, are occasionally used to convert some of the rotational energy of the exiting gas back into static pressure. Based on data presented by Muschelknautz and Bruimer (1967), a modest amount of pressure recovery (15 to 20% reduction in vortex core pressure loss) can be achieved with a simple conically shaped vortex tube, such as that shown in frame g. More efficient recovery (35 to 40% loss reduction) is possible with a well-designed internal conical insert, such as that shown in frame h. Normally, such a vortex tube is directly connected to a wide-bodied outlet diffuser or exit scroll which sits atop the cyclone roof. 

Muschelknautz (1980) investigated the effect of a number of pressure-recovery configurations including an exit scroll, a simple diffuser, an aimular diffuser with exit scroll, and a central body mounted with its bottom flush with the vortex finder lip without and with rectifying vanes. The last fom configurations were combined with a smoothing of the vortex finder lip. He found that these modifications reduced the pressme drop by 12, 31, 40, 44 and... 

The co-current flow conveyor will have its feed zone at the front (large diameter) end and some return channels will be built into the conveyor hub to lead the clarified centrate from the foot of the beach back to the front hub. between the exit ports of the feed zone. The countercurrent conveyor has its feed zone in the conveyor but abreast of the foot of the beach. Clarified liquor is free to flow around or through the conveyor flights to the front hub while the cake is scrolled to the rear, and up the beach. 

A collector with rinse nozzle connections to slurry the cake on exit from the bowl. Used for counter-current washing in some processes Refers to a conveyor with an inner flight as well as the main outer flight. The inner flight has opposite pitch, so as to scroll surface cake towards the front hub to increase its residence time in the bowl... 

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