GEA Process Engineering (India) Private Limited
offers "Paddle Dryer-
RosinaireTM" from GEA
Barr-Rosin, UK.
The Rosinaire™ is a high-speed, thin-layer,
indirect-contact, paddle processor. It consists of a horizontal, cylindrical
vessel containing a longitudinal rotor / paddle assembly. The vessel body is
fabricated with external jacket sections through which flows the heat transfer
fluid (steam, hot water, hot oil, or chilled water). Radial paddles are
fastened to the rotor shaft by means of locknuts. The adjustable paddle
orientation determines the residence time of the solids within the vessel.
Feed material is either pumped or conveyed into the
Rosinaire™ vessel. The centrifugal action of the high-speed
rotor / paddle assembly delumps and conveys the product material through the
Rosinaire™ as a thin-layer of solids in a helical flowpath
along the jacketed wall - - - resulting in very high heat transfer coefficients
(up to 150 Btu/hr/ft2/°F). As the solids are spiraled along the inside vessel
wall, heat is transferred by conduction. In the case of a drying application,
moisture is vaporized into the annular vapor space, and a small counter-current
flow of sweep air or inert gas is used to convey the evaporated material out of
the Rosinaire™ at the feed end. The product material is
discharged tangentially as a dispersed curtain of free flowing solids.
The Rosinaire™ is often employed to operate in closed
cycle mode, using a small flow of recirculating nitrogen or air to sweep away
the evaporated volatiles to the condenser, eliminating any potential air
pollution discharge to the atmosphere. This method is ideal for evaporating
solvents or for processing toxic substances.
Available units range from
pilot 10" (0.25 m) diameter up to full scale 84" (2.15 m) diameter.
The
Rosinaire™ is well suited to process Polymers, Organic
Chemicals, Inorganics, and Foods. The Rosinaire™ can handle
pumpable feedstocks (slurries, pastes, gels), as well as non-pumpable feeds in
the forms of centrifuge or filter cakes, crumbs, granules, beads, pellets,
powders, flakes, or short fibers.
The Rosinaire™ can
be used for solids thermal processing operations: Drying, Desolventizing,
Heating, Calcining, Polymer Crystallization, or Cooling.