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Air-Swept Tubular (AST) Dryer

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.

AST Dryer AST8420 AST Dryer AST Dryer AST2412 AST Dryer
Cutaway view of AST Dryer

Cutaway view of AST Dryer

Typical AST Dryer plant

Typical AST Dryer plant

1Hot air generator 5Cyclone
2Mass flow feeder 6Filter
3AST Dryer 7System fan
4Optional gravity discharge

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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