When the heat exchanger is in operation, the temperature of the shell and the tube wall are different from each other due to the different temperature of the cold and hot fluids. This difference makes the thermal expansion of the shell and the tube different. When the temperature difference between the two is large, the tube may be twisted, or the heat exchanger tube may be loosened from the flower plate, or even destroy the entire heat exchanger. In this regard, it is necessary to structurally consider the effect of thermal expansion and adopt various compensation methods.
During the start and stop of the heat exchanger, the temperature rise rate and temperature drop rate exceed the regulations, so that the high heat pipe and the tube sheet are subjected to greater thermal stress, and the weld or expansion joint where the heat exchanger tube and the tube sheet are connected Damaged, causing port leakage.
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