Hairpin double-tube-sheet heat exchanger and method for assembling heat-exchanging tubes and shells thereof

Abstract

The invention relates to a hairpin heat exchanger and an assembly method of a heat exchange tube and a shell thereof, comprising a U-shaped heat exchange tube, a shell and a tube sheet, the shell is a U-shaped shell, and the U-shaped The shell is composed of shell A section, shell B section and shell C section. The shell section A and shell B section form the two arms of the U-shaped shell, and the shell C section forms the middle part of the U-shaped shell. The bending section; the tube sheet is composed of the first front tube sheet, the first rear tube sheet, the second front tube sheet, and the second rear tube sheet, and the first front tube sheet and the first rear tube sheet are provided with the first An isolation cavity, a second isolation cavity is provided between the second front tube plate and the second rear tube plate; the U-shaped heat exchange tube is nested in the U-shaped shell, and the two arms of the U-shaped heat exchange tube are respectively positioned on the first The front tube sheet and the second front tube sheet; the heat exchanger obtained by using the assembly method of the heat exchange tube and the shell of the present invention increases the heat exchange area between the tube side medium and the shell side medium in a limited equipment space , avoiding the possibility of leakage of the exchange medium at the tube sheet.

Description

technical field [0001] The invention relates to a heat exchanger and an assembling method thereof, in particular to a double-tube-sheet heat exchanger with a U-shaped shell and an assembling method of the heat exchange tube and the shell. Background technique [0002] The heat transfer tube bundle of the U-tube heat exchanger is U-shaped, and the two ends of the tube bundle are fixed on the upper and lower parts of the same tube plate, and then divided into two inlets and outlets by the partition in the tube box. In the part, the tube plate is clamped between the tube box flange and the shell flange and connected with bolts. Since the U-shaped end of the tube bundle is not fixed, it can expand and contract freely, which completely eliminates the influence of thermal stress on the tube bundle, and is suitable for occasions where the temperature difference between the two fluids is large. But in practice, the heat exchanger must first be fixed by the base provided on the shel...

AI Technical Summary

Problems solved by technology

When the heat exchange temperature difference between the two fluids of the heat exchanger is large, the shell of the heat exchanger will inevitably be affected by thermal stress. A certain deformation will inevitably occur, which will inevitably have a certain impact on the service life and heat transfer effect of the heat exchanger

[0003] In addition, since the ordinary U-shaped tube heat exchanger has only one tube sheet, the medium in the shell cavity of the heat exchanger is easy to leak into the tube cavity at the connection between the U-shaped tube and the tube sheet, and this mixed medium enters the other The equipment will cause damage to other equipment. Some media are high-pressure and toxic fluids. Once leaked, they will pollute the environment and even cause fatal injuries to personnel.

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