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Falling Film Evaporator classification
Mar 26, 2021

1 . According to the method of evaporation: natural evaporation: that is, the solution evaporates at a temperature lower than the boiling point, such as sea water drying salt. In this case, because the solvent only vaporizes on the surface of the solution, the solvent vaporization rate is low. Boiling evaporation: heating the solution to the boiling point to make it evaporate in a boiling state. Industrial evaporation operations are basically of this type. 

2 . According to heating method: direct heat source heating is an evaporation process in which fuel and air are mixed, and the high-temperature flame and smoke generated by combustion are directly sprayed into the evaporated solution through the nozzle to heat the solution and vaporize the solvent. The indirect heat source heats the walls of the container to transfer the evaporated solution. That is , the heat transfer process in the dividing wall heat exchanger. 

3 . According to operating pressure: it can be divided into normal pressure, pressurization and decompression (vacuum) evaporation operations. Obviously, for heat-sensitive materials, such as antibiotic solutions, fruit juices, etc., it should be carried out under reduced pressure. High-viscosity materials should be heated by pressurized high-temperature heat sources (such as heat transfer oil , molten salt, etc.) for evaporation . 

4 . According to the number of effects: can be divided into single-effect and multi-effect evaporation. If the secondary steam produced by evaporation is directly condensed and no longer used, it is called single-effect evaporation. If the secondary steam is used as the next-effect heating steam, and multiple evaporators are connected in series, this evaporation process is multi-effect evaporation.

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