Encyclopedia of Environmental Science and Engineering, Volume I and II

1322 WATER TREATMENT

REFRIGERANT

COILS(HEAT

REMOVAL)

VAPOR COMPRESSOR

DRIVER

VAPOR

COMPRESSOR

IMPELLOR

SCRAPER

DRIVE

WASH WATER DISTRIBUTOR

ON SCRAPER

TO AIR

REMOVAL

ICE DECANTER

BRINE

OUT

FRESH WATER OUT

SEA

WATER

IN

BRINE

OUT

HEAT

EXCHANGER

PRODUCT WATER

FEED WATER

ICE-BRINE SLURRY

FREEZER-

EVAPORATOR

FRESH

WATER

FREEZER

A G I TATO R

A G I TATO R

DRIVE

ROTATING

PERFORATED

ICE MELTING

TRAY

AMMONIA

REFRIGERATOR

VAPOR

VAPOR MIST

SEPARATOR

BRINE

ICE RISING

SCREEN

TO AIR

REMOVAL

ICE

MELTER

SCRAPER

ICE

FIGURE 18 Vacuum freezing process

COMPRESSOR

TO AUXILIARY

EQUIPMENT

SPRAY

CONDENSER

HEAT

EXCHANGER

NOTE : BOTH BUBBLES

AND CRYSTALS

ARE SHOWN

BUTANE

CONDENSATE

RETURN

FREEZER

BRINE

OUT

SEA

WATER IN

FRESH WATER OUT

ICE-FRESH WATER

SLURRY

ICE-BRINE

SLURRYTO ICE

DECANTER ICE DECANIER

BRINE FROM

RECYCLE OUTANE

LIQUID BUTANE FOR CONDENSER

CELL IV CELL III CELL II

CELL

ICE

DECANTER

FIGURE 19 Secondary refrigerant freezing process

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