Spin Flash Dryer - SFD

• This flash dryer is useful for mechanical dispersion and for adjusting the granule size of high humidity paste type material.
• Under the action of hot air and mechanical dispersion, the wet cake appears granular and gets fluidized.
• Instantaneous exchange of heat and mass takes place.
• The dried materials are taken in the collector as powder products.
• The system consists of double shaft screw followed by mono screw to feed homogenized material into dryer housing at controlled rate.
• The tangential entry of air and mechanical action of agitator help to decompose lumps enabling intimate mixing of hot air with the product, and thus ensuring drying of the product.

• The particle classification orifice on the top of drying chamber allows finer product to pass with exhaust gas to powder collection system.
• The flash dryer is useful for drying sticky products, also effective against viscous materials.
• The simple Flash Dryer is designed lo handle materials that can be suspended directly in air, requiring removal of free moisture.
• Wet material is dispersed into a stream of heated air (or gas) which conveys it through a drying duct.
• Using the heat from the air stream, the material dries as it is conveyed. Drying takes place in a matter of seconds, and the final moisture is generally in the constant rate drying zone.

• Elevated drying temperatures can be used with many products since the flashing off of surface moisture instantly cools the drying gas without appreciably increasing the product temperature.
• Product is separated using cyclone, and/or bag filter.
• Typically, cyclones are followed by scrubbers or bag filters for final cleaning of the exhaust gases to meet current emission requirements.