APV Dryer Handbook - Umbc
APV Dryer Handbook - Umbc
APV Dryer Handbook - Umbc
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HYDRAULIC CAPACITY<br />
The wheel speed also affects the hydraulic capacity of the atomizer, although<br />
this is usually only seen at extremely high liquid rates or very low wheel speeds.<br />
A higher wheel speed causes a greater pumping action within the atomizer wheel<br />
and contributes to the hydraulic capacity of the atomizer. If the hydraulic capacity<br />
of a centrifugal atomizer is exceeded for any reason, feed liquid is forced to flow<br />
up the atomizer spindle and through the bearings, causing very rapid failure in<br />
most cases.<br />
WHEEL TYPE<br />
There are two types of atomizer wheels available for Anhydro atomizers: radial<br />
drilled or standard wheel and cup wheel.<br />
Standard Wheel<br />
The standard wheel has radial drilled holes and can be provided with abrasion<br />
resistant inserts, shown in Figure 31a, for handling crystalline or other abrasive<br />
feed materials. It has the higher hydraulic capacity due to its large acceleration<br />
chamber – and can withstand a certain amount of abuse during operation<br />
and cleaning.<br />
Cup Wheel<br />
The cup wheel shown in Figure 31b is used when the narrowest particle size<br />
distribution is required from a centrifugal atomizer. The cup wheel has a smaller<br />
3 5 6<br />
4 1 2<br />
Figure 31a. Abrasion resistant radial<br />
drilled wheel<br />
Figure 31b. Cup wheel<br />
63
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