Straight-through cyclone

Straight-through cyclones with fixed impellers,... 

Akiyama T, Marui T. Dust collection efficiency of a straight-through cyclone effects of duct length, guide vanes and nozzle angle for secondary rotational flow. Powder Technol 58 181, 1989. 

The fourth type of inlet we wish to describe is that of swirl vanes. As shown in Fig. 1.3.8 d, a swirl-vane assembly allows the gas to enter the cyclone parallel to the axis of the cyclone The swirl-vane assembly is positioned between the vortex finder (or, in case of a straight-through device, see below, a central solid body) and the outer (body) wall of the cyclone. This type of inlet is often inserted in cylindrical-bodied cyclones rather than in cylinder-on-cone or conical-bodied geometries. When it is, we refer to the separator as a swirl tube. Swirl tubes are often of small size (by commercial standards) and are most commonly arranged in a parallel array on a common tube-sheet within a pressure-retaining vessel. They are normally fed from, and discharge into, common, but separate overflow and underflow plenums. 

The separator on the far right of Fig. 13.3.4 and in Fig. 13.3.5 is a rather sophisticated cylindrical-bodied flow-through or straight-through type cyclone. 

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