Page 164 - Process Equipment and Plant Design Principles and Practices by Subhabrata Ray Gargi Das
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162 Chapter 6 Evaporators
may or may not occur at the heating surface. Since either the vapor or the concentrate stream or both,
maybe the desired product, the evaporator has provisions for separation of the vapors from the
concentrate and the feed. The vapor-liquid separator prevents entrainment, contamination of the
condensed vapor and fouling/corrosion of surface on which the vapor condenses. The vapor outlet in
the separator is usually connected to a vacuum system or a condenser, as shown in Fig. 6.2.
vapour
Evaporator body
central downcomer
Feed
Steam
Calandria
Condensate
Concentrate
FIGURE 6.1
Short tube evaporator with calandria.
CW in CW out
Condenser
Condensed
vapour
Steam
Heater
Condensate
Feed
Pump
Concentrate
FIGURE 6.2
Evaporator with external heating e forced circulation.
