Introduction To Convap Scraped-Surface Evaporator

Just as in Contherm units, the product is pumped (B) into the lower end of the Convap heat exchanger cylinder (A). The heating medium flows in the annular space between the heat transfer wall and the insulated jacket. Mechanical agitation, provided by the revolving blades, creates the convection conditions essential for efficient heat transfer. The scraping blades continuously remove the product film from the precision /finished cylinder wall. The Convap rotor, driven by a motor on the upper end of the unit, spins the heavier liquid droplets towards the cylinder wall. This action ensures a continuous re-wetting of the heat transfer surface and the removal of vapour, as well as preventing product burn-on. The Convap is normally operated under vacuum. Vaporization occurs in the Convap scraped-surface heat exchanger cylinder (A). The separator (D), connected to the Convap by a custom-designed vapour dome (C), allows the separation of the concentrate from the vapour phase. In the separation vessel, the vapour exits the top to a condenser (E) driven by a vacuum pump (G), while the concentrated product exits at the bottom, forced by a concentrate removal pump (J). As an option, separator vessel can be fitted with a spray ball head for effective CIP cleaning in between batches. A pressure sensor (L) can be fitted on the top of the separator vessel and a level transmitter can be fitted on the concentrated product out piping. A loop for a CIP bypass pump (K) can also be implemented.