Evaporation

Concentrators and Crystallizers

Evaporators with Mechanical Vapour Re-Compression

Where low pressure steam is not available, A.H. Lundberg Systems offers single effect falling film concentrators with mechanical vapour re-compression to power the evaporation process. Although starting steam is required to start the evaporation process, re-compression and re-use of the steam/vapour produced from the liquor itself, is used as the heat source to maintain the evaporation process.

All A.H. Lundberg Systems concentrators with mechanical vapour re-compression have high efficiency mist eliminators in each vapour body, assuring high purity condensate is achieved from the condensed steam and valuable or destructive salts are not carried over in the vapour phase. Where necessary, for highly foaming liquids, external vapour washers are available, integrated into the vapour re-compression system.

Available materials of construction for the evaporators includes 316L stainless steel, high nickel austenitic stainless steels, duplex stainless steels, and reactive metals such as titanium.

Flooded Forced Circulation Evaporators (Crystalizers)

A.H. Lundberg Systems' preferred technology for crystallizing solids from liquor or brines is Flooded Forced Circulation. This technology utilizes forced liquor circulation through the tube side of a heater with the liquor under a back pressure to suppress boiling. The superheated liquor is flashed in a vapour head, resulting in evaporative cooling.

The flooded forced circulation technology utilizes separate vessels for the vapour head and heater. This permits easy access to the heater tubing through the two channel covers if mechanical cleaning is required. A heater may be mounted vertically or horizontally depending upon space constraints.

High efficiency vertical chevron type mist eliminators are used in the vapour heads to assure high purity condensate is recovered and chemical concentration is maximized to the liquor.