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Double Drum Dryers
Double Drum Dryers
Description
- Most versatile and widely applied dryers
- Used to dry food, chemicals, and pharmaceuticals
- Materials vary in density and viscosity such as dilute solutions, heavy liquids, or pasty materials
- Effective for heavy sludges that become saturated and deposit salts
- Products sensitive to high temperatures can be dried successfully because exposure to temperatures above the boiling point is restricted to just a few seconds
- Movable drum permits complete control of product film thickness
- Feed may be accomplished via perforated tube trough, pendulum, or specially engineered devices
- Can be equipped with externally controlled full or partial enclosures to protect personnel when drying toxic, dusty, or flammable products
- Solvents can be reclaimed by connecting vapor outlet to a condenser
- Recovery or elimination of dust from vapor can be accomplished by adding a scrubber
- Mechanical support skids are available for double drum dryers
Features
- Equipped with two (2) accurately fabricated, steam-heated drums that rotate downward toward the nip or pinch of the rolls. Drums may be manufactured from steel, cast iron or stainless steel
- Wet feed is introduced to nip by various methods including perforated pipe, pendulum feed or mechanical trolley
- Reservoir of fluid is formed between drums and contained within endboards fitted against end faces of drums
- Wet feed level may be varied as required
- Liquid is heated to boiling point and partially concentrated by hot drum surfaces
- Feed is deposited as film on both drums
Benefits
- Drying takes place within a single revolution of the drums
- Dried material is removed by adjustable knives
- One drum is movable to enable thickness of product film to be controlled
- Thickness of film can be modified to produce product ranging from flakes to powder
