Flash evaporation (or partial evaporation) is the partial vapor that occurs when a saturated liquid stream undergoes a reduction in pressure by passing through a throttling valve or other throttling device. This process is one of the simplest unit operations. If the throttling valve or device is located at the entry into a pressure vessel so that the flash evaporation occurs within the vessel, then the vessel is often referred to as a flash drum.[1][2]
If the saturated liquid is a single-component liquid (for example, propane or liquid ammonia), a part of the liquid immediately "flashes" into vapor. Both the vapor and the residual liquid are cooled to the saturation temperature of the liquid at the reduced pressure. This is often referred to as "auto-refrigeration" and is the basis of most conventional vapor compression refrigeration systems.
If the saturated liquid is a multi-component liquid (for example, a mixture of propane, isobutane and normal butane), the flashed vapor is richer in the more volatile components than is the remaining liquid.
Uncontrolled flash evaporation can result in a boiling liquid expanding vapor explosion (BLEVE).
^Stanley M. Walas (1988). Chemical Process Equipment:Selection and Design. Butterworth-Heinemann. ISBN 0-409-90131-8.
^Gas Processing Suppliers Association (GPSA) (1987). Engineering Data Book (10th Edition, Vol. 1 ed.). Gas Processing Suppliers Association, Tulsa, Oklahoma.
Flashevaporation (or partial evaporation) is the partial vapor that occurs when a saturated liquid stream undergoes a reduction in pressure by passing...
concentration of the evaporating substance in the surrounding gas significantly slows down evaporation, such as when humidity affects rate of evaporation of water...
and wet air cooler) is a device that cools air through the evaporation of water. Evaporative cooling differs from other air conditioning systems, which...
multi-stage flash distillation and reverse osmosis. Solar distillation mimics the natural water cycle, in which the sun heats sea water enough for evaporation to...
conventional evaporating unit. Circulation evaporation incorporates the use of both heat exchangers and flash separation units in conjunction with circulation...
of water around objects Flashevaporation, causing evaporation by lowering a fluid's pressure below its vapour pressure Flashing light, such as a light...
explosive-like flashevaporation of a portion (typically about half) of the liquid. The latent heat absorbed by this flashevaporation is drawn mostly...
the adiabatic flashevaporation of a part of the liquid refrigerant. The auto-refrigeration effect of the adiabatic flashevaporation lowers the temperature...
Condensation Critical line Critical point Crystallization Deposition EvaporationFlashevaporation Freezing Chemical ionization Ionization Lambda point Melting...
no azeotrope with the other components in the mixture. Flashevaporation (or partial evaporation) is the partial vaporization that occurs when a saturated...
as reboilers for distillation columns, or as pre-concentrators or flashevaporators or pre-heaters designed to remove volatile components prior to stripping...
towards a discharge port. A common practice is to cool the solutions by flashevaporation: when a liquid at a given T0 temperature is transferred in a chamber...
produce boiling, foul-smelling liquid that partially becomes a gas (flashevaporation) and is expelled through an outlet valve with a loud popping sound...
warm seawater enters a vacuum chamber and is flash-evaporated, similar to the open-cycle evaporation process. The steam vaporizes the ammonia working...
exchange exclusion, both cationic and ionic ion exchanges, vacuum flashevaporation, thin film distillation, and heating to produce a 100% pure glycerol...
either oil bearings or magnetic bearings. Air separation Dry gas seal Flashevaporation Gas compressor Joule-Thomson effect Liquefaction of gases Rankine...
results in flashevaporation of a part of the liquid refrigerant, lowering its temperature. The cold refrigerant is then routed through the evaporator coil...
this temperature. This results in a flashevaporation, which allows for concentration by multiple-effect evaporation. In the 1970s the American sugar refiners...
Global Information