Vacuum Drying Filter Press
Principles and characteristics
VACUUM DRYING FILTER PRESS
VACUUM DRYING
Steam or hot water is used in plate to make the water (that is left in the sludge cake) vaporized by indirectly heating, and the vacuum pump is used to let out the water vaporized and free water in filtered cake completely. Through heat exchanger, it condenses into water to let off. Naturally, the filter chamber must be kept in a minus pressure 500mmHg (at this moment. corresponding water boiling point is about 70°C). Wait until water in the sludge cake is vaporized and let off completely. Then filter plates are automatically open, dried cake falls on the conveyer belt to be packed in P.P. bag or cake hopper. Fully automatically operates.
Sludge particle and water structure
VACUUM DRYING
Steam or hot water is used in plate to make the water (that is left in the sludge cake) vaporized by indirectly heating, and the vacuum pump is used to let out the water vaporized and free water in filtered cake completely. Through heat exchanger, it condenses into water to let off. Naturally, the filter chamber must be kept in a minus pressure 500mmHg (at this moment. corresponding water boiling point is about 70°C). Wait until water in the sludge cake is vaporized and let off completely. Then filter plates are automatically open, dried cake falls on the conveyer belt to be packed in P.P. bag or cake hopper. Fully automatically operates.
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| Calorific value introduction | Relation between boiling point and pressure |
Sludge particle and water structure
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Free water: may be removed by settling and gravity drainage Capillary water and interstitial water: must be removed by centrifugation or pressurization Internal water: has solid structures and must be removed by blow-drying or heating. |