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The colder seawater passing through the condenser tube bundles of the various stagesincreases evaporator vacuum The amount of heated feed water discharged from the feed water heater after cndenseris increased Fewer non-condensable gases are created by the flow of colder seawater More seawater is allowed to pass through the flint stage overflow weir
masses fabrics substances liquids
a separate air ejector unit a direct unimpeded connection between second stage and salt water feed heater either by vacuum drag or an external line from the first stage via a fixed orifice the fixed orifice provided in the steam supply line
the flashing of the feed water the condensation of the saltwater feed air ejectors, eductors, or a separate vacuum pump condensation of the distillate
to decrease scale formation for better cooling effect for more economical purpose to raise vacuum
Feed-water heater internal tube surfaces Internal distillate cooler tubes Flash chamber vertical surfaces Distilling condenser tubes
higher than the first stage feed-water temperature and absolute shell pressure lower than the first stage feed-water temperature and absolute shell pressure the same as the first stage feed-water temperature and absolute shell pressure not related to the feed-water temperature and absolute shell pressure
Flash1 Flash2 Flash3 Flash4 Flash5
Condenser circulating water pump Feed-water heater drain pump Distillate pump Air ejector condenser drain pump
psychrometer salinometer anemometer sphygmomanometer
fill the unit with saltwater fill the unit with de-scaling compound completely drain the unit tightly seal the unit to exclude air
masses fabrics substances liquids
poor distillate quality reduced evaporator capacity low brine concentration improper vacuum regulation
Fire pump and lube oil pump Lube oil pump and distilling plant Distilling plant and shaft alley door Shaft alley door and fixed CO2 release
greater distillate purity through high temperature evaporation cold shocking for scale removal is not required less internal corrosion because of lower brine density less feed-water is required for equal plant capacity
completely filled with saltwater filled with de-scaling compound tightly closed to exclude air vented to the atmosphere
Distilled Distilling Boiling Boiled
first stage flash chamber second stage flash chamber first stage after condenser second stage distilling condenser
distilling condenser salt water feed heater distillate cooler flash chamber
pressure does not fluctuate rapidly pressure remains steady and unchanged brine density does not exceed 1.5 brine density is too low
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