Flash Dryer - Pneumatic Drying System

By: Gea Barr-rosin  09-12-2011
Keywords: Bag Filters, Drying Systems, Exhaust Gases

The GEA Barr-Rosin Flash Dryer is a pneumatic system primarily used to dry products requiring the removal of free moisture. Drying takes place in a matter of seconds. Wet material is dispersed into a stream of heated air (or gas) which conveys it through a drying duct.

Flash Dryer

Using the heat from the airstream, the material dries as it is conveyed. Product is separated using cyclones, and/or bag filters. Typically, cyclones are followed by scrubbers or bag filters for final cleaning of the exhaust gases to meet current emission requirements.

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.

For even greater thermal efficiency and where inertisation is required, recycling of exhaust gases can be used. This can be implemented on all our airstream drying systems and retrofitted on customer's existing drying operations.

Many of the largest dryers in the world are flash dryers - some exceeding 20 tons of water evaporation per hour in a single system. Inlet air temperature ranges from 200- 1400°F (100oC -650oC) while airflows can exceed 120,000 cfm (200,000 m3/hr).

Flash dryers have been used to dry products in many industries including food, chemical, mineral and polymer. A broad range of feed materials including powders, cakes, granules, flakes, pastes, gels, and slurries can be processed. For slurries, pastes, or sticky materials, backmixing of the wet feed with a portion of dry product to produce a suitable conditioned material is required.

This technology can also be used for cooling applications.

Open Circuit Flash Dryer

The GEA Barr-Rosin Research and Development Center is equipped with a pilot scale flash dryer for conducting trials.

Keywords: Airstream Drying, Bag Filters, Drying Systems, Exhaust Gases, Flash Dryer, Flash Dryers, Open Circuit, Scrubbers Or Bag Filters,

Other products and services from Gea Barr-rosin


Rotary Dryer / Rotary Cooler

In the indirect dryer, which is more suited to fine and dusty materials, there is little or no contact between the product and the drying gases since they are heated from the outside, via a stationary jacket fitted with either multiple burners or other external heat source. The directly heated rotary dryer operates on the principle of lifting and showering the product through a hot gas stream moving either in parallel or counter-flow.


Superheated Steam Processor (SSP

The solids are fed into the flow of pressurised superheated transport steam by means of a pressure tight rotary valve, plug screw or similar. The Superheated Steam Processor can be used for drying and/or heat treatment of many products. The Superheated Steam Processor is a closed loop pneumatic conveying system.


Products - Fluid Bed Dryer

The process air is supplied to the bed through a special perforated distributor plate and flows through the bed of solids at a velocity sufficient to support the weight of particles in a fluidized state. Very high heat and mass transfer values are obtained as a result of the intimate contact with the solids and the differential velocities between individual particles and the fluidizing gas.


Ring Dryer

For slurries, pastes, or sticky materials, our specifically designed feed system allows backmixing of the wet feed with a portion of dry product to produce a suitable conditioned material for feeding into the dryer. This selective extension of residence time enables the Ring Dryer to process many materials which were traditionally regarded as difficult to dry in a Flash Dryer.



GEA Barr-Rosin supplies industrial drying systems and offers numerous systems and technologies to dry wet materials, ranging from granules, cakes, and powders to sludges, slurries, and solutions. Our systems are custom designed to meet the customer's exact requirements.