Thermal Vapour Recompression Evaporators
Thermal Vapour Recompression
Swenson thermal vapour recompression (TVR) evaporators use a thermocompressor to reduce the steam required per pound of evaporation—ultimately reducing energy consumption and saving costs.
Benefits of Thermal Vapour Recompression Evaporators
• Significant energy and cost savings
• Ideal for low boiling-point rise liquids
How Thermal Vapour Recompression Evaporators Work
To reduce energy consumption, water vapour from an evaporator is entrained and compressed with high pressure steam in a thermocompressor so it can be condensed in the evaporator heat exchanger. The resultant pressure is intermediate to that of the motive steam and the water vapour. A thermocompressor is similar to a steam ejector used to maintain vacuum in an evaporator.
Only a portion of the vapour from an evaporator can be compressed in a thermocompressor with the remainder condensed in the next-effect heat exchanger or a condenser. A thermocompressor is normally used on a single-effect evaporator or on the first effect of a double- or triple-effect evaporator to reduce energy consumption. Like mechanical recompression, thermal recompression is more applicable to low boiling-point rise liquids and low to moderate differential temperatures in the heat exchanger to minimize the compression ratio.
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