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Classification of evaporators
Mar 01, 2020

1. By evaporation method:

 

Natural evaporation: that is, the solution at a temperature below the boiling point of evaporation, such as sea salt, in this case, because the solvent is only vaporized on the surface of the solution, the solvent vaporization rate is low.

 

Boiling evaporation: to heat a solution to a boiling point and allow it to evaporate at boiling. Industrial evaporation operations are basically the same.

 

2. According to heating mode:

 

Direct heat source heating: it is the mixture of fuel and air, so that the combustion of the high temperature flame and smoke through the nozzle directly into the vaporized solution to heat the solution, solvent vaporization evaporation process.

 

Indirect heat source heating: transfer of the walls of the containers to the evaporated solution. That is, the process of heat transfer in inter-wall heat exchanger.

 

3. According to operating pressure:

 

Can be divided into atmospheric pressure, pressure and pressure (vacuum) evaporation operations.

 

Obviously, for heat sensitive materials, such as antibiotic solution, juice, etc., should be under pressure. High viscosity materials should be used to heat the high temperature heat source (such as heat conduction oil, molten salt, etc.) for evaporation

 

4. According to the number of effects:

 

It can be divided into single effect and multiple effect evaporation.

 

If the secondary steam produced by evaporation is no longer used for direct condensation, it is called single effect evaporation. If the secondary steam is used as the next heating steam and multiple evaporators are connected in series, the evaporation process is called multi-effect evaporation.

 

5. Divided by cooling medium:

 

According to different types of cooling medium, evaporators can be divided into two categories:

 

(1) evaporator for cooling liquid refrigerant carrier. Used for cooling liquid refrigerant - water, brine or ethylene glycol solution. The common types of evaporator are horizontal evaporator, vertical tube evaporator and spiral tube evaporator.

 

(2) evaporator for cooling air. Such evaporators have cooling ducts and coolers.

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