According to the temperature difference compensation measures adopted, the tube-and-tube heat exchanger can be divided into the following types.

1.Fixed tube sheet type

The difference between the temperature of the shell and the wall of the heat transfer tube is greater than 50 ° C, plus a compensation ring, also called an expansion joint. When there is a temperature difference between the shell and the tube bundle, the elastic deformation of the compensation ring is used to adapt to the different thermal expansion between them .

Features: simple structure, low cost, difficult maintenance and cleaning of the shell side, the shell side must be a clean, non-prone scale and corrosion medium.

2.Floating head

Tube plates at both ends, one end is not connected to the shell, and can float freely along the length of the tube. When the shell and the tube bundle cause thermal expansion due to different temperatures, the tube bundle and the floating head can freely expand and contract in the housing in the axial direction, which can completely eliminate thermal stress.

Features: The structure is relatively complicated, the cost is high, the temperature difference stress is eliminated, and it is a structural form that is widely used.

3.U-tube type

Tube plates at both ends, one end is not connected to the shell, and can float freely along the length of the tube. When the shell and the tube bundle cause thermal expansion due to different temperatures, the tube bundle and the floating head can freely expand and contract in the housing in the axial direction, which can completely eliminate thermal stress.

Features: The structure is relatively complicated, the cost is high, the temperature difference stress is eliminated, and it is a structural form that is widely used.

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