Helical roof

Equipping the cyclone with an inlet scroll or decreasing the width of the inlet duct, as shown in Figs. 12.1.3c and 12.1.3d, are two common ways of preventing the particular problem shown in Fig. 12.1.3a. In the latter case, the height of the inlet may be increased in proportion to the decrease in inlet width if one wishes to maintain the same inlet velocity. In some instances, it may be possible to decrease the diameter of the vortex tube or increase the barrel diameter to avoid the interference. It may even be possible to install two smaller inlets, spaced 180° apart, as per Fig. 12.1.3e. Helical roof designs... 

Fig. 15.1.19. A Beckert and Hiester twin cyclone dust collector featuring scroU inlets and gas outlets and helical roofs...

Fig. 15.1.21. Illustration of a helical-roof cyclone. Cyclone shown features one of the author s (Stein) custom built versions of a Mini CV06 cyclone designed by BiU Pentz (http //billpentz.com/woodworking/cyclone/index.cfm) and bnilt in clear PETG plastic (similar to Lexan but bendable) by Ed Morgano of Clear Vne Cyclones (http //WWW.clearvuecyclones.com)...

When the gas and solids enter a helical roof cyclone, the roof forces it to assume a helical downward spiral in the barrel section of the cyclone. With... 

Once through helical coil type SGs are adopted and they are suspended from the roof slab Mod 9Cr-lMo steel is used as the material of the major element These SGs have double wall outer shells Between these walls, argon gas is enclosed It works as a thermal insulator between hot sodium in the SGs and cold sodium in the secondary vessel The technical feasibility of a rectangular helical coil type SG is being examined, because it has a high potential to reduce the diameter of the secondary vessel... 

One would have to exercise care in any side-by-side comparative study of the two roof designs to ensure that the only significant difference between the flat head and helical head designs is the roof itself. This would require that ... 

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