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Floating head heat exchanger

Floating head heat exchanger

One end of the tube sheets at both ends of the floating head heat exchanger is not connected to the shell, and this end is called a floating head. When the tube is heated, the tube bundle together with the floating head can freely expand and contract along the axial direction, completely eliminating the temperature difference stress.

Floating head heat exchanger structure

Drill holes and wire or weld multiple screws evenly between the concave and trapezoidal grooves. Set the floating head flange as a double seal of convex and trapezoidal bosses. The dividing plate is connected to the trapezoidal bosses and located at A wide-face flange with the same end face, and the convex and trapezoidal bosses and split-range partitions match the concave and trapezoidal grooves and split-range grooves of the floating head tubesheet respectively. The floating head flange is matched with the spherical surface without flanging The head is assembled and welded into a floating head cover, and the flange screw holes are matched with the wire holes or screws of the floating head tube sheet. Bolts or nuts are used to tighten and compress the concave and trapezoidal grooves and split grooves of the floating head tube sheet. and its gaskets. If necessary, this structure can appropriately increase the thickness and diameter of the floating head tube plate and the inner diameter of the cylinder, and at the same time change the size of the relevant parts accordingly; it is also equipped with an auxiliary steel ring without external force, whose inner diameter Larger than the outer diameter of the floating head tube sheet, one end of the steel ring has a flange connected and sealed with the concave or trapezoidal sealing surface on the inner side of the outer head cover flange, and the other end has a flange or other structure connected to the original concave groove of the floating head tube sheet and its gasket or outer surface. Round seal.

Characteristics of floating head heat exchanger

 One end of the tube sheet of the floating head heat exchanger is fixed between the shell and the tube box, and the other end of the tube sheet can move freely within the shell. This feature can be seen on site. Thermal expansion of the heat exchanger shell and tube bundle is free, and the tube bundle can be extracted to facilitate cleaning between and within the tubes. Its disadvantages are that the structure is complex and the cost is high (20% higher than the fixed tube sheet). Leakage occurs at the floating head during operation, making it difficult to inspect and deal with. The floating head heat exchanger is suitable for conditions where the temperature difference between the shell and the tube bundle is large or the medium on the shell side is prone to fouling.

Floating head heat exchanger application scope

Floating head heat exchangers are suitable for situations where the wall temperature difference between the shell and the tube bundle is large or the medium on the shell side is prone to scaling.

Material of floating head heat exchanger

The shell material is carbon steel or stainless steel, and the heat exchange tube material is copper. Customized floating head heat exchangers with special materials, heat exchange areas and working pressure levels.

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