Paper Dryer Conversion from Rotary to Stationary Syphons, 19PaperCon
This case study covers the conversion of paper dryers from two rotary syphons to single cantilever stationary syphons on a containerboard machine with high drying rates. The original syphon configuration had two large- perimeter, close-clearance, rotating syphons with the syphons located at two cross-machine quarter-point positions. The replacement syphon configuration had a single stationary syphon, cantilevered from a rigidly mounted rotary steam joint with dryer turbulence bars covering the inside surface of the dryer cylinder. With two rotary syphons, the heat transfer rate and profile uniformity both progressively degraded as speed increased. With the stationary syphon and dryer bars, the heat transfer rate was high and uniform at all speeds tested. The differential pressure and blow through flow rate required to drain condensate from the dryer were significantly lower with the stationary syphon than with the two rotary syphons. Reducing the dryer differential pressure and the amount of blow-through steam can greatly reduce the amount of steam venting to atmosphere or to condensers.
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Paper Dryer Conversion from Rotary to Stationary Syphons, 19PaperCon