Falling film evaporatoration using   Thermal Vapour Recompression (TVR)

Steam-heated falling film evaporators require an ample supply of live steam to
drive the evaporation process through multiple effects.

Multi-effect evaporation uses vapour from one effect as the heating medium in a subsequent
effect, operating at a lower pressure and temperature. This procedure can be repeated a number of times, depending on the available overall temperature difference of the system and the return on investment of additional effects. Evaporation temperature is determined largely by the heat
sensitivity and viscosity of the product. Thermal vapour recompression across one or more effects enhances process cost-effectiveness by using a steam jet compressor to compress part of the vapour discharged from one effect for use as the heating medium for the first effect.

Multi-effect evaporation thus enables the exploitation of low-grade heat from the evaporator itself for gentle and effective preheating across calandrias with a low temperature difference.

Features
Optimum energy utilization
High heat transfer coefficients
Short residence time
Single-pass evaporation
Easy building conversion and
adaptation to existing facilities


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