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How Many Types Of Evaporator?
Jan 04, 2018

The evaporator is a very important part of the four large parts of refrigeration. 

The cryogenic condensed fluid uses the evaporator to exchange heat with the air outside.

The heat absorption of vaporization achieves the effect of refrigeration.

1.Classified by evaporation type:

Natural evaporation: that is, the solution evaporates at less than boiling temperature, such as sea water dry in the sun. In this case, the solvent evaporates at a low rate due to the evaporation of the solvent only on the surface of the solution.

Boiling evaporation: heat the solution to the boiling point to evaporate in the boiling state.Industrial evaporation is basically this mode.

2.Classified according to heating method:

Direct heat source is used to mix the fuel with the air, so that the high temperature flame and flue gas sprayed  into the evaporated solution directly through the spray nozzle to heat the solution and vaporize the solvent.

The indirect heat source heats the container to the evaporating solution.The heat transfer process is carried out in a wall heat exchanger.

3.Classified according to operating pressure:

Can be divided into normal pressure, add pressure and reduce peussure(vacuum) evaporation operation.Obviously, for heat-sensitive materials such as antibiotics, juice, etc

it should be proceeding in the reduced pressure condition.The high viscosity materials should be heated by pressurized hot heat source (such as thermal conductivity, molten salt, etc.)

4.Classified by number of effects:

It can be divided into single effect and multi-effect evaporation.If the secondary steam generated by evaporation is no longer used, it is called single effect evaporation.

If you take the second steam as the next effect is to heat the steam and connect the evaporators in series. This evaporating process is the multi-effect evaporation.