Forced Ciruclation Evaporator

Forced Circulation Evaporator Operation

As the name implies, force is used to drive the liquid through the evaporator tubes thus producing high tube velocities. A high efficiency circulating pump, designed for large volume and sufficient head, is used to supply the force. Proper design results in controlled temperature rise, controlled temperature difference and tube velocities that give optimum heat transfer. Forced Circulation Evaporators are recommended for viscous, scaling and salting liquids. As the liquid is only heated in the steamchest with flashing taking place in the separator and no boiling taking place within the tubes, fouling on hot tube walls is reduced.

BUFLOVAK Forced Circulation Evaporators may be equipped with either horizontal or vertical steam chests. The circulating pump withdraws liquid from the lower part of the vapor-liquid separator and circulates it through the tubes at a high velocity.  Boiling is suppressed in the tubes either by liquid head or an orifice plate. The heated liquid is discharged into the separator where the vapor flashes off due to the temperature difference and is removed through the top outlet. The liquid is discharged at a maintained liquid level.
 

Forced Circulation Evaporator Characteristics

Operates with extremely low temperature differences

High tube velocity

Velocity mechanically produced and controlled

Gives high rate of heat transfer, rapid evaporation and high concentration without requiring high operating temperatures or large heating surface

Maximum recovery of solids

Can use horizontal or vertical tubes

Tubes are readily accessible for cleaning and inspection

Suitable for single or multiple effects

 

Product Application

Very viscous liquids

Scaling liquids tending to produce scale

Heat-sensitive materials

Crystal producing liquids

 

Forced Circulation Evaporator Application Examples

Acid Raffinates                                        Glycerin

Ammonium  Sulphate                            Irish Moss Extracts

Anhydrous Sodium  Sulfate                  Pectin Solutions

Caprolactum                                            Sodium Chlorate

Diaphragm Cell  Caustic                         Sodium Sulfate

Distillery Slop                                           Soup Stocks

Ferrous Sulfate                                        Sugar Esters

Fish Stickwater                                         Tomato Paste

Gelatin                                                       Waste Water

Glue                                                           Yeast Cream

Glutanic Acid

 

Forced Circulation Horizon

Requires lower head room. Can be designed with multiple pass arrangement for high tube velocities.