Concentric rows of tubes (one-six rows depending on the dryer size and duty) run the length of the dryer. Material is fed into the steam tube dryer generally through a screw conveyor. A product dam at the discharge end of the dryer creates a bed level which covers all of the rows of tubes with product, and maximizes the heat transfer area contact between the product and steam tubes.
A steam and condensate manifold chamber, Steam Chest, is mounted on the product discharge end of the dryer. This Steam Chest distributes steam to each of the steam tubes and also collects the condensate formed as the steam transfers its latent heat to the material being processed. Steam is delivered to, and condensate is removed from, the Steam Manifold by means of a rotary steam joint.
The residual non-condensable gases, left inside of the steam tubes once the steam has condensed, are vented through a flexible connection attached to a common “Vent Header” mounted at the feed end of the LOUISVILLE Steam Tube Dryer. This Vent Header has thermostatically controlled vent valves which allow the cooler non-condensable gases to be efficiently vented as they accumulate while containing valuable steam energy inside the steam tubes.