High-Temperature Heat Exchanger Tube-Sheet Assembly Investigation With Computational Fluid Dynamics

[+] Author and Article Information
Michael A. Porter

 Dynamic Analysis, 2815 Stratford Road, Lawrence, KS 66049mike@dynamicanalysis.com

Dennis H. Martens

 Black & Veatch Pritchard Corporation, 11401 Lamar, Overland Park, KS 66211martensdh@bv.com

Thomas Duffy

 Motiva Enterprises, Highway 70 at 44, PO Box 37, Convent, LA 70723tmduffy@motivaenterprises.com

Sean McGuffie

 Porter McGuffie, Inc., 544 Columbia Drive, Suite 19, Lawrence, KS 66049sean@3dmet.com

J. Pressure Vessel Technol 129(2), 313-315 (Nov 20, 2006) (3 pages) doi:10.1115/1.2716436 History: Received May 17, 2006; Revised November 20, 2006

Many modern sulfur recovery unit process waste heat recovery exchangers operate in high-temperature environments. These exchangers are associated with the thermal reactor system where the tube-sheet–tube-ferrule assemblies are exposed to gasses at temperatures approaching 3000°F. Because sulfur compounds are present in the process gas, the carbon steel tube sheet and tubes in the assembly will be deteriorated by sulfidation as the operating metal temperature rises above 600°F. Ferrule systems are used to protect the carbon steel from exposure to excessive temperatures. The temperature distribution in the steel tube-sheet–tube-ferrule system is affected by process gas flow and heat transfer through the assembly. Rather than depend on “assumed” heat transfer coefficients and fluid flow distribution, a computational fluid dynamics investigation was conducted to study the flow fields and heat transfer in the tube-sheet assembly. It was found that the configuration of the ferrule installation has a large influence on the temperature distribution in the steel materials and, therefore, the possible sulfidation of the carbon steel parts.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 6

CFD 2D axisymmetric model configuration

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Figure 1

Tubesheet assembly

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Figure 2

Typical ferrule layout on tubesheet

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Figure 3

Ferrule configuration

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Figure 4

FE 2D axisymmetric model indicated temperature profile

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Figure 5

CFD 3D model configuration




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