The floating head heat exchanger floats in a structural feature in which one of the tube plates at both ends is not fixedly connected to the casing, and can be freely expanded and contracted in the axial direction inside the casing, and the end is called a floating head. The advantage of the floating head heat exchanger is that when there is temperature difference between the heat exchange tube and the housing, when the housing or the heat exchange tube expands, it does not restrain each other and does not generate temperature difference stress; the tube bundle can be extracted from the housing to facilitate the inside of the tube and the tube. Cleaning.
The shortcoming is that the structure is more complicated, the amount of materials is large, and the cost is high; if the sealing between the floating head cover and the floating tube plate is not strict, an internal leakage occurs, resulting in mixing of the two media. The floating head heat exchanger is suitable for occasions where the wall and tube bundle wall temperature difference is large or the shell side medium is easy to scale.
The U-tube heat exchanger has the structural feature of having only one tube plate, the heat exchange tube is U-shaped, and the two ends of the tube are fixed on the same tube sheet. The tube bundle can be freely stretched. When there is temperature difference between the shell and the U-shaped heat exchange tube, no temperature difference stress will occur. The U-tube heat exchanger has the advantages of simple structure, only one tube plate, less sealing surface, reliable operation and low cost; the tube bundle can be taken out and the tube cleaning is convenient. The disadvantage is that the cleaning inside the tube is difficult; since the tube needs a certain bending radius, the utilization rate of the tube sheet is low; the inner tube of the tube bundle is large, the shell side is easy to be short-circuited; the inner tube is broken and cannot be replaced, so the scrap rate Higher.
The U-tube heat exchanger is suitable for occasions where the temperature difference between the tube and the shell wall is large or the shell-side medium is easy to scale, and the tube-pass medium is not easy to scale and high temperature, high pressure and corrosive. Generally, the high temperature, high pressure and corrosive medium can reduce the high pressure space, the sealing is easy to solve, and the material can be saved and the heat loss can be reduced.
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