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According to different process requirements and heat exchange methods, heating shell and tube heat exchanger and cooling shell and tube heat exchanger can be further classified. Common classification methods include:

1. Single-phase flow heat exchangers and multiphase flow heat exchangers: In single-phase flow heat exchangers, the heating or cooling medium is a single liquid or gas; In a multiphase flow heat exchanger, the heating or cooling medium is a mixture of various substances in different phases, such as liquid and gas.

2. Parallel flow heat exchanger and counter flow heat exchanger: In a parallel flow heat exchanger, the heating medium and the heated medium flow in the same direction during the heat transfer process; In a countercurrent heat exchanger, the heating medium and the heated medium flow in opposite directions during the heat exchange process.

3. Fluid inside and outside the tube: Fluid inside the tube refers to the flow of heating or cooling media inside the heat exchanger; External fluid refers to the flow of heating or cooling media outside the heat exchanger.

4. Tube bundle heat exchanger and shell and tube heat exchanger: In a tube bundle heat exchanger, the heating or cooling medium flows through a bundle of tubes, while the heated or cooling medium flows through the outside of the tube bundle; In a shell and tube heat exchanger, the heating or cooling medium flows through the tubes inside the shell, while the heated or cooling medium flows through the outside of the shell.

The evaporative shell and tube heat exchanger can heat the liquid through the heat exchange tube inside the pipeline, causing it to evaporate into steam. During the evaporation process, the liquid absorbs heat, causing the temperature of the liquid to rise and reach the desired evaporation temperature.