Air-Swept Tubular (AST) Dryer
Air-Swept Tubular Dryer model AST8420
The Air-Swept Tubular Dryer is a new concept in drying technology. Manufactured in the United States, it will process anything from low solids slurries to low moisture powders. The flow of material through the dryer is controlled so that the product may be a fine, dry powder or a moist granular material.
Three separate zones in the dryer control the rate of drying with the central retention zone determining the residual moisture content and physical size of the product.
High temperature differentials are used but as with most flash dryers, the product temperature is lower than the wet-bulb temperature of the system.
The heat source for the dryer is an oil or gas fired hot air generator, usually integrated with the drying cylinder.
Product collection can be directly from the final zone of the drying tube, from a cyclone or from a bag filter. The dryer is manufactured in nine sizes with evaporation rates as high as eight tonnes per hour.
Cutaway view of AST Dryer
Typical AST Dryer plant
| 1 | Hot air generator | 5 | Cyclone |
| 2 | Mass flow feeder | 6 | Filter |
| 3 | AST Dryer | 7 | System fan |
| 4 | Optional gravity discharge |
Brochure and Publication Downloads
AST Dryer
Languages: German [440 KB] English [1.62 MB] French [423 KB]
Typical Feed Materials
| Alumina trihydrate | Bentonite | Bone meal | Brewer's grains | Calcium carbonate |
| Cellulose | Ceramic fibre | Cereals | Chicken manure | Citrus pulp |
| Coagulated blood | Coal fines | Coconut fibres | Feather meal | Fish meal |
| Gluten | Gypsum board | Household waste | Iron oxides | Kaolin |
| Magnesium oxide | Mica | Paper sludge | Pigments | Pork skin residues |
| PVC resin | Sawdust chips | Seaweed | Sewage sludge | Silica |
| Soy protein | Titanium dioxide | Wood flour |
Technical Data
| Units | AST 1610 |
AST 2010 |
AST 3012 |
AST 3612 |
AST 4815 |
AST 6018 |
AST 7220 |
AST 8422 |
AST 9624 |
|
|---|---|---|---|---|---|---|---|---|---|---|
| Heat input | ×106 kJ/h | 1.0 | 1.5 | 2.5 | 4.0 | 6-9 | 9-15 | 12-18 | 16-24 | 24-30 |
| Airflow | am3/h | 2,500 | 3,750 | 6,250 | 10,000 | 22,500 | 37,500 | 45,000 | 60,000 | 75,000 |
| Max. evaporation | kg/h H2O | 380 | 570 | 750 | 1,200 | 2,650 | 4,400 | 5,250 | 7,000 | 8,800 |
| Motor power | kW | 15 | 22 | 45 | 75 | 110 | 132 | 200 | 250 | 300 |
| Length | mm | 3,900 | 4,100 | 5,100 | 5,200 | 6,700 | 8,800 | 10,400 | 11,600 | 12,200 |
| Width | mm | 1,200 | 1,500 | 1,800 | 2,200 | 2,900 | 3,500 | 3,800 | 4,200 | 4,600 |
| Height | mm | 850 | 1,000 | 1,250 | 1,400 | 1,800 | 2,400 | 2,700 | 3,000 | 3,350 |