Importance

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Abstract

A rotary dryer for the drying of a moving web of material has a thin-walled shell with lateral heads and bearing journal at each end, and is heated internally with steam. For the discharge of condensate and flash steam a low-pressure syphon rotating with the shell is provided, consisting of syphon shoe, standpipe and outlet pipe. To keep the differential pressure required for the discharge of the mix of condensate plus flash steam as low as possible even in changing operating conditions the invention provides for the arrangement of an internal baffle in the center of the syphon shoe to convey the mix of condensate in flash steam and also to stabilize it. For this purpose the internal baffle may have as supplement also additional internal subdivision chambers. Furthermore, the invention also provides for the additional arrangement of steam jet nozzles. The rotary low-pressure syphon according to the invention (FIG. 2) is particularly effective at high production speeds for minimization of the differential pressure required for the discharge of the mix, furthermore for system stabilization in changing production conditions.

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First Claim