Thermovapor compression desalters

Energy and availability - Analysis of single- and multi-effect systems

Najem M. Al-Najem, M. A. Darwish, F. A. Youssef

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Sidem (France) has made some recent advancements in thermal vapor compression (TVC) systems [1,2] by installing four units, each having four effects, 1 migd in capacity with a gain ratio of 8, and another four units of 12 effects each, with 2 migd capacity per unit and a gain ratio close to 17. This increased the interest in the system particularly for plants of low and medium capacity. The new system is characterized by the following: (1) the compression of most of the generated vapor and its usage as a heating medium drastically reduce the primary heat source (boiler) and heat sink (i.e., cooling water and condenser), as compared to conventional single-effect desalting systems; (2) low energy consumption; (3) simple water pretreatment as compared with reverse osmosis (RO) systems, which are the main competitors of mechanical and thermal vapor compression systems in small and medium capacities; (4) low capital and operating costs; and (5) recently developed reliable thermocompressors. Since very little is known about the principles and design of the system, a parametric analysis, using the first and second laws of thermodynamics, was conducted for the TVC system components, e.g., steam ejector, evaporator, condenser, as well as the system as a whole. The analysis pinpoints the deficiencies in the system and the methods of overcoming these deficiencies.

Original languageEnglish
Pages (from-to)223-238
Number of pages16
JournalDesalination
Volume110
Issue number3
Publication statusPublished - 1 Sep 1997
Externally publishedYes

Fingerprint

Vapors
compression
Availability
energy
Condensers (liquefiers)
Salt removal
cooling water
Steam
Reverse osmosis
Heat sinks
Cooling water
Evaporators
heat source
Operating costs
Boilers
Energy utilization
thermodynamics
Thermodynamics
heating
Heating

Keywords

  • Availability destruction
  • Desalting
  • Gain ratio
  • Multi-effect desalters
  • Performance ratio
  • Second law analysis
  • Steam ejector
  • Thermal compressor
  • Thermovapor compression desalters

ASJC Scopus subject areas

  • Filtration and Separation

Cite this

Thermovapor compression desalters : Energy and availability - Analysis of single- and multi-effect systems. / Al-Najem, Najem M.; Darwish, M. A.; Youssef, F. A.

In: Desalination, Vol. 110, No. 3, 01.09.1997, p. 223-238.

Research output: Contribution to journalArticle

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