Impact of deposit ageing on thermal fouling: Lumped parameter model

Authors

  • Edward. M. Ishiyama,

    1. Dept. of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Cambridge CB2 3RA, U.K.
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  • Francesco Coletti,

    1. Dept. of Chemical Engineering and Chemical Technology, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.
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  • Sandro Macchietto,

    1. Dept. of Chemical Engineering and Chemical Technology, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.
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  • W.R. Paterson,

    1. Dept. of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Cambridge CB2 3RA, U.K.
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  • D. I. Wilson

    Corresponding author
    1. Dept. of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Cambridge CB2 3RA, U.K.
    • Dept. of Chemical Engineering and Biotechnology, University of Cambridge, New Museums Site, Cambridge CB2 3RA, U.K.
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Errata

This article is corrected by:

  1. Errata: Erratum Volume 56, Issue 6, 1671, Article first published online: 29 March 2010

Abstract

The thermal and hydraulic performance of heat exchangers can be seriously impaired by the formation of fouling deposits on the heat transfer surfaces. The thermal effect of fouling can be complicated when the deposit is subject to ageing, represented here as a change in deposit thermal conductivity (but not thickness) over time. In this article, we revisit the ageing concept for crude oil fouling proposed by Nelson (Refiner Nat Gas Manufacturer. 1934;13:271–276, 292–298), using a numerical model incorporating first order kinetics to generate quantitative comparisons of different ageing rates. Results are reported for lumped parameter systems (which also simulate point measurement methods commonly used in laboratory testing) that demonstrate that ageing can have a substantial influence on the rate of heat transfer and hence on the surface temperature and rate of fouling. Rapid ageing (compared with the rate of deposition) does not pose problems, but slow ageing, or the use of constant heat fluxes in experiments, can lead to modified thermal fouling behavior. It is concluded that deposit ageing dynamics should be considered alongside deposition rate dynamics when interpreting experimental fouling data and when modeling fouling behavior in support of heat exchanger design or operation. © 2009 American Institute of Chemical Engineers AIChE J, 2010

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