Research Papers: Design and Analysis

Deflections of A Multipass Shell-and-Tube Heat Exchanger Bolted Joint Subjected to Nonaxisymmetric Thermal Loading

[+] Author and Article Information
Natalia Petrova

Ecole de Technologie Superieure, 1100 Notre-Dame Ouest, Montreal, PQ, H3C 1K3, Canadanataliapetrova@sympatico.ca

Abdel-Hakim Bouzid

Ecole de Technologie Superieure, 1100 Notre-Dame Ouest, Montreal, PQ, H3C 1K3, Canadahakim.bouzid@etsmtl.ca

J. Pressure Vessel Technol 134(1), 011207 (Dec 02, 2011) (9 pages) doi:10.1115/1.4004623 History: Received February 18, 2011; Revised April 26, 2011; Accepted May 02, 2011; Published December 02, 2011; Online December 02, 2011

Despite the fact that multipass shell-and-tube heat exchangers operating at high temperature are subject to frequent problems related to flange sealing, there is neither detailed explanations for the reasons of the failures nor an adequate solution to this problem. Specific geometry of multipass heat exchangers and the temperature difference between the inlet and the outlet fluids is responsible for the existence of a thermal circumferential gradient at the shell-to-channel bolted joint. However, existing flange design methods do not address nonaxisymmetrical temperature loading of the flanged joint assembly. The circumferential thermal gradient, as the cause of frequent failures to seal the flanged joints, is ignored. This paper outlines the analytical modeling of a flanged joint with a tube sheet of a multipass heat exchanger subjected to a nonaxisymmetrical thermal loading. A shell-and-tube heat exchanger of 51 in. diameter with cocurrent flow was used for analysis. The main steps of the theoretical analysis used for the determination of the circumferential temperature profiles and the thermal expansion displacements and distortions of the bolted joint components are given. The results from the proposed analytical model are compared with those obtained from finite element models.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Temperature distribution in a four-pass heat

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Figure 2

Thermal model of shell-to-channel bolted joint

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Figure 3

Flange sector with bolt

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Figure 4

Thermal model of bolt

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Figure 5

Meshed FEM model with bolts

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Figure 6

FEM model with bolts (temperature distribution)

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Figure 7

FEM model with joint elements detached (temperature distribution)

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Figure 8

Temperature distributions of tube and shell fluids

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Figure 9

Temperature distributions in the bolted joint

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Figure 10

Temperature distributions of bolts

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Figure 11

Radial displacements of the channel and shell

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Figure 12

Radial displacements of flange rings

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Figure 13

Radial displacements of hubs

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Figure 14

Hub rotation comparisons




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