The shell and tube heat exchanger is composed of shell, heat transfer tube bundle, tube sheet, baffle plate (baffle) and tube box. The shell is mostly cylindrical with a tube bundle inside, and both ends of the tube bundle are fixed on the tube plate. So what are its characteristics?

1. Structural features

Shell and tube heat exchangers usually have three forms: fixed tube inner plate, U-shaped tube and floating head type. The three structures have their own advantages and disadvantages and are suitable for different occasions. The shell and tube heat exchanger is mainly composed of shell, tube sheet, tube bundle, head and other components.

2. Design considerations

There are many types of heat exchange equipment. For each specific heat transfer condition, a more suitable equipment model will be obtained through optimization and selection. If this type of equipment is used in other working conditions, the heat transfer effect may be greatly changed. Therefore, it is a very important task to select the type of heat exchanger for specific working conditions. For the design of shell and tube heat exchangers, the following factors are worth considering.

3. Selection of flow rate

Flow rate is an important variable in the design of heat exchangers. Increasing the flow rate can increase the heat transfer coefficient, while the pressure drop and power consumption rate also increase. There are two advantages to using a higher flow rate: one is to increase the total heat transfer coefficient, thereby reducing the heat transfer area; the other is to reduce the possibility of fouling on the surface of the tube.

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