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Introduction to fixed tube and plate heat exchangers

2022-02-18

Today is the introduction of tube heat exchanger, which is fixed tube plate heat exchanger.

Fixed tube-plate heat exchanger has the advantages of simple structure, compact structure and low cost, but it cannot be mechanically cleaned outside the tube. The heat exchanger tube bundle is connected with the tube plate, the tube plate is welded at both ends of the shell, and is connected with the top cover, the top cover and the shell is provided with a fluid inlet and outlet pipe. A series of baffles perpendicular to the tube bundle are usually arranged outside the tube. At the same time, the connection between the tube and the tube plate and the shell is rigid, while inside and outside the tube are two kinds of fluid with different temperatures. Therefore, when the temperature difference between tube wall and shell wall is large, due to the different thermal expansion of the two, the temperature difference stress is very large, and even the tube bends or loosens the tube from the tubesheet, and even destroys the heat exchanger. In order to overcome temperature difference stress must have temperature difference compensation device, generally in the tube wall and shell wall temperature difference of more than 50℃, for the sake of safety, heat exchanger should have temperature difference compensation device. However, the compensation device (expansion joint) can only be used in the case that the temperature difference between shell wall and tube wall is less than 60 ~ 70℃ and the fluid pressure of shell side is not high. Generally, when the shell side pressure exceeds 0.6mpa, other structures should be considered because the compensation ring is too thick to expand and lose the function of temperature compensation.

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