Classification by purpose and structure

     Classification by purpose

1. A heater heats the fluid to the necessary temperature, but there is no phase change in the heated fluid.

2. The preheater preheats the fluid in advance, providing standard process parameters for process operations.

3. A superheater is used to heat a fluid (process gas or steam) to an overheated state.

4. An evaporator is used to heat a fluid to a temperature above the boiling point, causing the fluid to evaporate, usually with phase changes.

    Classification by structure

It can be divided into: floating head heat exchangers, fixed tube sheet heat exchangers, U-shaped tube sheet heat exchangers, plate heat exchangers, etc.