Low temperature flash vaporization for desalination

Low temperature flash vaporization for desalination

The feasibility of desalination by low pressure vaporization of seawater at temperatures between 26°C and 32°C was demonstrated in a pilot plant. The plant operated at vacuum pressures between 1.3 KPa and 2.3 KPa. The saline water was sprayed into the vaporizer as fine droplets using a swirl nozzle...

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Bibliographic Details
Published in:Desalination Vol. 180; no. 1; pp. 25 - 32
Main Authors: Muthunayagam, A.E., Ramamurthi, K., Paden, J.R.
Format: Journal Article
Language:English
Published: Amsterdam Elsevier B.V 15-08-2005
Elsevier
Subjects:
Applied sciences
Chemical engineering
Condensation
Drinking water and swimming-pool water. Desalination
Exact sciences and technology
Flash vaporization
Heat exchangers and evaporators
Pollution
Water spray
Water treatment and pollution
Water spray
Condensation
Flash vaporization
Pilot plant
Desalination
Heat exchanger
Droplet
Vortex
Flash vaporization; Condensation
Low temperature
Seawater
Vaporization
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Summary:The feasibility of desalination by low pressure vaporization of seawater at temperatures between 26°C and 32°C was demonstrated in a pilot plant. The plant operated at vacuum pressures between 1.3 KPa and 2.3 KPa. The saline water was sprayed into the vaporizer as fine droplets using a swirl nozzle and evaporated at the low pressure. The maximum flow rate was 1,000 1/h. Condensation of the vapor so formed, was carried out in a shell and tube heat exchanger. The yield of fresh water was up to 4% as predicted by theory. The quality of the condensed water was excellent. The investigation demonstrated a novel concept of devising a desalination system by using warm water from the upper strata of the ocean for flash vaporization at low pressures and condensing the vapors using cold water from the lower strata of the ocean. The performance of the pilot plant was determined for different feed water temperatures, vacuum and water injection pressures.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0011-9164
1873-4464
DOI:10.1016/j.desal.2004.12.028