Receive 5-15 % energy savings with effective pocket ventilation
Significant energy saving is guaranteed with an EVpv Pocket Ventilation™ system, by decreasing the pocket humidity level, correcting the pocket moisture profile and eliminating the need for over-drying.
The PM drying section is a major steam consumer: over 75 % of paper machine steam consumption is used in the drying process. High pocket humidity level, uneven sheet moisture profile and runnability problems are the results of poor pocket ventilation.
Typical problems with poor or unventilated dryer cylinder pockets:
- Increased steam consumption
- Uneven CD moisture profile in cylinder pockets → uneven sheet moisture profile → over-drying → ENERGY LOSS
- Decreased production
The EVpv pocket ventilators are installed near the felt rolls blowing dry supply air to the pockets. This decreases the pocket humidity level, corrects pocket moisture profiles and eliminates the corrective over-drying. Over-drying of edges is controlled by adjustable edge blowing nozzles.
Lower drying costs
Increased speed potential
Fewer web breaks
Better moisture 2-sigma
SC, sheet width at reel 540 cm
Steam consumption: 33 t/h to 30 t/h
Speed: 1025 m/min to 1065 m/min
Production: 19.6 t/h to 20.6 t/h