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Multi-stage flash distillation (MSF) is a water desalination process that distills sea water by flashing a portion of the water into steam in multiple stages of what are essentially countercurrent heat exchangers. Current MSF facilities may have as many as 30 stages. [1]
Multiple-effect distillation or multi-effect distillation (MED) is a distillation process often used for sea water desalination. It consists of multiple stages or "effects". In each stage the feed water is heated by steam in tubes, usually by spraying saline water onto them.
The desalination process's energy consumption depends on the water's salinity. Brackish water desalination requires less energy than seawater desalination. [82] The energy intensity of seawater desalination has improved: It is now about 3 kWh/m 3 (in 2018), down by a factor of 10 from 20-30 kWh/m 3 in 1970.
The second system type is a so-called two-loop plant with a capacity of around 2,000 litres per day (530 US gal/d). Here, the collector circuit is separated from the desalination circuit by a saltwater resistant heat exchanger. [7] Based on these two system types, a various number of prototypes were developed, installed and observed.
The first method utilizes an ejector system motivated by steam at manometric pressure from an external source in order to recycle vapor from the desalination process. The form is designated ejectocompression or thermocompression. Using the second method, water vapor is compressed by means of a mechanical device, electrically driven in most cases.
Obtaining fresh water from seawater is a theoretically simple system that, in practice, presented many difficulties. While there are numerous effective methods today, early desalination efforts had low yields and often could not produce potable water. [1]
Seawater desalination plants have produced potable water for many years. However, until recently desalination had been used only in special circumstances because of the high energy consumption of the process. [citation needed] Early designs for desalination plants made use of various evaporation technologies.
Low-temperature thermal desalination (LTTD) is a desalination technique which takes advantage of the fact that water evaporates at lower temperatures at low pressures, even as low as ambient temperature. The system uses vacuum pumps to create a low pressure, low-temperature environment in which water evaporates even at a temperature difference ...
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