Vapor-liquid separator

Vapor-liquid separator

A vapor-liquid separator is a vertical vessel used in several industrial applications to separate a vapor-liquid mixture. Gravity causes the liquid to settle to the bottom of the vessel, where it is withdrawn. [cite book|author=William D. Baasel|title=Preliminary Chemical engineering Plant Design|edition=2nd Edition|publisher=Van Nostrand Reinhold|year=1990|id=ISBN 0-442-23440-6] [cite book|author=David H.F. Liu|title=Environmental Engineers' Handbook|edition=2nd Edition|publisher=CRC Press|year=1997|id=ISBN 0-8493-9971-8] [cite journal|author=Stanley S. Grossel|year=2004 |month=June|title=Design and sizing of knock-out drums/catchtanks for emergency relief systems|journal=Plant/Operations Progress (AIChE)|volume=5|issue=3|pages=129–135|issn=0278-4513|doi=10.1002/prsb.720050304] [cite book|author=Stanley M. Walas|title=Chemical Process Equipment:Selection and Design|edition= |publisher=Butterworth-Heinemann|year=1988|id=ISBN 0-409-90131-8 ] The vapor travels upward at a design velocity which minimizes the entrainment of any liquid droplets in the vapor as it exits the top of the vessel.

The feed to a vapor-liquid separator may also be a liquid that is being partially or totally "flashed" into a vapor and liquid as it enters the separator.

A vapor-liquid separator may also be referred to as a flash drum, knock-out drum, knock-out pot, compressor suction drum or compressor inlet drum.

When used to remove suspended water droplets from streams of air, a vapor-liquid separator is often called a demister.

Where vapor-liquid separators are used

Vapor-liquid separators are very widely used in a great many indusries and applications, such as:

*Oil refineries
*Natural gas processing plants
*Petrochemical and chemical plants
*Refrigeration systems
*Air conditioning
*Compressor systems for air or other gases
*Gas pipelines
*Steam condensate flash drums
*Geothermal power plants

ee also

*Flash evaporation
*Vapor-compression refrigeration
*Souders-Brown equation (for sizing vapor-liquid separators)
*Steam drum


External links

* [ High-Capacity Gas De-Entrainment] (scroll to page 2 of the brochure)
* ["Experimental Characterization of High-Pressure Natural Gas Scrubbers" by Trond Austrheim] (preprints of papers based on PhD Thesis at the University of Bergen, Norway, 2006)
* [ Flash Steam Tutorial] The benefits of recovering flash steam, how it is done and typical applications.
* [ Design Criteria for Vapor/Liquid Separators]

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