Rational Analysis of Heat-Exchanger Tube-Sheet Stresses

1956 ◽  
Vol 23 (3) ◽  
pp. 468-473
Author(s):  
Yi-Yuan Yu
Keyword(s):  
Heat Exchanger ◽  
Present Method ◽  
Maximum Stress ◽  
Perforated Plate ◽  
Tube Sheet ◽  
Heat Exchanger Tube ◽  
Rational Analysis ◽  
Side Pressure ◽  
Limiting Values ◽  
Exchanger Tube

Abstract The paper presents a rational method of analysis of heat-exchanger tube-sheet stresses. While the tube sheet is taken to be a perforated plate on an elastic foundation in the manner of Gardner and Miller, it is also considered as part of an integrated indeterminate structure, and the interaction between the tube sheet and the connecting cylindrical shells and flange of the exchanger is determined so that a condition may be formulated which the edge rotation and edge moment of the tube sheet must satisfy. In general, neither the edge rotation nor the edge moment is zero; the edge of a tube sheet is therefore neither clamped nor simply supported. Application of the present method to four different types of heat exchangers is described in detail. To illustrate the method, Gardner’s example of a fixed-tube-sheet exchanger is recalculated. While Gardner’s method yields only the two limiting values of the maximum stress in the tube sheet, which differ by more than 100 per cent, the present method makes it possible to determine the exact value of this maximum stress. By means of the present method, the stresses in the other parts of the heat exchanger, namely, the tubes, shell, head, and flange, also can be calculated. As a consequence of the present analysis, it is found that, in the external-floating-head type of exchanger, the tube-sheet stress is not independent of the shell-side pressure, which is contrary to Gardner’s and Miller’s conclusions.

Heat-Exchanger Tube-Sheet Design—2: Fixed Tube Sheets

1952 ◽  
Vol 19 (2) ◽  
pp. 159-166
Author(s):  
K. A. Gardner
Keyword(s):  
Thermal Expansion ◽  
Heat Exchanger ◽  
Tube Sheet ◽  
Heat Exchanger Tube ◽  
Shell Side ◽  
Side Pressure ◽  
Differential Thermal Expansion ◽  
Design Factors ◽  
Exchanger Tube ◽  
Design Pressure

Abstract It is shown that “fixed” tube sheets may be designed in exactly the same manner as “floating” tube sheets with the same boundary restraint, provided that a fictitious uniform “equivalent design pressure” is used in the calculations instead of the actual hydrostatic pressure. This equivalent pressure is evaluated in terms of tube-side pressure, shell-side pressure, differential thermal expansion, and the condition of boundary restraint. The design factors for all tube sheets presented in an earlier paper are shown to be well represented by very simple expressions when the fundamental design parameter xa becomes large.

scholarly journals Computational and experimental studies on the causes of crack network formation in the area of the heat exchanger tube sheet in the BN-600 reactor

2015 ◽  
Vol 2015 (1) ◽  
pp. 56-65
Author(s):  
Oleg Yur’evich Vilenskij ◽  
Alexey Nikolaevich Krylov ◽  
Sergey Leonidovich Osipov ◽  
Dmitry L’vovich Osetrov ◽  
Sergey Aleksandrovich Rogozhkin ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Network Formation ◽  
Experimental Studies ◽  
Tube Sheet ◽  
Heat Exchanger Tube ◽  
Crack Network ◽  
Exchanger Tube

scholarly journals Numerical research on thermal stress of steam cooler tube sheet mechanical structure

2021 ◽  
Vol 2125 (1) ◽  
pp. 012013
Author(s):  
Jun Wu ◽  
Zhaoli Zheng ◽  
Yong Li ◽  
Jie Pang ◽  
Zhiwu Ke ◽  
...  
Keyword(s):  
Power Generation ◽  
Thermal Stress ◽  
Heat Exchanger ◽  
Working Conditions ◽  
Tube Sheet ◽  
Generation System ◽  
Heat Exchanger Tube ◽  
Temperature Load ◽  
Power Generation System ◽  
Exchanger Tube

Abstract Steam cooler is one of the most important mechanical equipment in thermal power generation system and nuclear power generation system. The steam cooler bears a huge temperature gradient load when the working conditions are switched. In order to analyze the thermal stress of steam cooler tube sheet with high temperature load under harsh working conditions, the thermal-structural coupling analysis model of steam cooler tube sheet is constructed with finite element method. The results show that the stress concentration exists at the position connection between heat exchanger tube and cylinder. The maximum stress is located at the outermost heat exchanger tube with the peak stress of 320MPa. The heat exchanger tube layout alone cause higher stress. This situation should be avoided in the design of heat exchanger tube sheet. Furthermore, the strength and safety of the steam cooler tube sheet are evaluated with the stress linearization method. The steam cooler tube sheet design meets the safety requirements of structural strength under high temperature load.

scholarly journals Passive instability control by a heat exchanger in a combustor with nonuniform temperature

2017 ◽  
Vol 9 (4) ◽  
pp. 380-393 ◽  
Author(s):  
Aswathy Surendran ◽  
Maria A Heckl
Keyword(s):  
Heat Exchanger ◽  
Perforated Plate ◽  
Heat Exchanger Tube ◽  
Perforated Plates ◽  
Thermoacoustic Instabilities ◽  
Bias Flow ◽  
Stability Maps ◽  
Unstable Combustion ◽  
Set Up ◽  
Exchanger Tube

Thermoacoustic instabilities, caused by the feedback between unsteady heat release and acoustic pressure perturbations, are characterised by large-amplitude pressure oscillations. These oscillations, if uncontrolled, pose a threat to the integrity of combustion systems. One strategy to mitigate them is by installing cavity-backed perforated plates with bias flow into the combustion chamber. In this study, we consider a generic combustor configuration: a one-dimentional tube (with open and/or closed ends) containing a compact heat source and a heat exchanger tube row. The idea is to use the heat exchanger tube row as a device (analogously to a cavity-backed perforated plate) to manipulate the downstream end condition. We simulate the row of heat exchanger tubes by a slit-plate with bias flow. We derive the characteristic equation for the complex eigenfrequencies of this set-up. From the growth rates (imaginary parts of the eigenfrequencies), we construct stability maps for various system parameter combinations. The results, obtained for the first two modes of the system, show that by varying the cavity length or the bias flow velocity through the slits, we can stabilise a previously unstable combustion system.

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