Vacuum Salt
Crystalline sodium chloride, commonly known as vacuum salt, is produced by evaporative crystallisation. The energy source for the evaporation can be thermal energy resulting in various plant configurations, specifically Multiple Effect Evaporation (MEE), Thermal Vapour Recompression (TVR) or Mechanical Vapour Recompression (MVR). All three plant configurations can generate high quality product and condensate.
Mechanical Vapour Recompression (MVR)
MVR technology enables salt producers to benefit from lower operating costs where the relative price of electricity is more attractive than that of steam.
Value
- Low carbon footprint
- Small boiler investment
- Reduced building costs due to compact plant design
- Low cooling water consumption
- Easy operation
- Higher quality condensate
Process
- Brine preheating
- Evaporation / Crystallisation
- Vapour scrubbing
- Vapour recompression
- Centrifugation
- Drying
Flow Diagram
Multiple Effect Evaporation (MEE)
MEE technology provides a low-cost and flexible operational solution if the use of steam is acceptable.
Value
- Simple and robust operation
- High operational flexibility
- Longer life-span of equipment due to lower process temperatures
Process
- Brine preheating
- Serial reuse of vapour
- 3-6 evaporative crystallisers
- Final vapour condensation
- Centrifugation
- Drying
Thermal Vapour Recompression (TVR)
TVR technology is a variant of MEE which increases the energy efficiency of the steam at the expense of a higher operational cost for the boiler.
Value
- Simple and robust operation
- Improved energy efficiency
- Higher return on investment
- Improves the performance of a MEE plant
Process
- Brine preheating
- Combination of boiler steam and process vapour as the energy source
- 3-6 evaporative crystallisers
- Final vapour condensation
- Centrifugation
- Drying
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