Calculation method for tube plate and tube bundle of floating head heat exchanger

Abstract

The invention provides a calculation method for a tube plate and a tube bundle of a floating head heat exchanger. The calculation method comprises: S1, respectively arranging materials of a fixed endtube plate and a floating end tube plate; S2, respectively setting the thicknesses and the diameters of the fixed end tube plate and the floating end tube plate; S3, calculating a corresponding bending stress value sigma p of the fixed-end tube plate and a corresponding bending stress value of the floating-end tube plate through the seven-element linear equation set; S4, respectively comparing sigma p with [sigma 1] and [sigma 2]; and S5, calculating the axial stress sigma t of the heat exchange tube, and comparing the sigma t with the allowable stress [sigma t] or the critical pressure stresssigma cr of the heat exchange tube. According to the calculation method for the tube plate and the tube bundle of the floating head heat exchanger, materials of the fixed end tube plate and the floating end tube plate can be selected respectively, circumferential stress and radial stress borne by the upper surfaces and the lower surfaces of the fixed end tube plate and the floating end tube plateare calculated respectively, and then the thickness of the tube plate is determined. The fixed end tube plate and the floating end tube plate are made of different materials and can be different in thickness and diameter, and the application range of the floating head heat exchanger is enlarged.

Description

technical field [0001] The invention relates to the technical field of shell and tube heat exchangers, in particular to a calculation method for tube sheets and tube bundles of floating head heat exchangers. Background technique [0002] Shell-and-tube heat exchangers account for about 30% of petrochemical plant equipment and are typical pressure vessels. Shell-and-tube heat exchangers are divided into U-shaped tube heat exchangers, fixed tube-sheet heat exchangers and floating head heat exchangers. The floating head heat exchangers are mainly used in the case of high temperature difference and easy scaling of the internal medium. [0003] The main components of the floating head heat exchanger include: fixed end tube sheet, floating end tube sheet and heat exchange tube bundle, which is called the tube sheet system here. The tube sheet system and the shell side shell are only connected by the fixed end tube sheet. The axial direction of the heat exchanger is in a free stat...

AI Technical Summary

Problems solved by technology

The existing formula calculations require the material and thickness of the fixed-end tube sheet and the floating-end tube sheet to be the same, resulting in the application range of the floating head heat exchanger being too small

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