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Development, study of performances and integration of thermal probes for fouling characterisation of tubular heat exchangers

Laetitia Perez
Abstract : Ever since the end of the 1970's, heat exchangers have known some new applications linked to the need of the energy expense optimisation. Fouling of such heat exchangers is one of the main causes of thermal efficiency decrease during their use. Indeed, fouling constitutes a major economic and technological problem where complex physical phenomena occur. In spite of the efforts displayed for these last decades, the existing detection and fouling follow up devices are still far from taking into account the heat transfer and the deposit phenomena involved. Thus, we decide in our study to elaborate a thermal sensor the most possible representative of industrial conditions in order to set up an efficient cleaning programme. To this end, two original localised and technologically simple sensors associated with a data processing adapted were developed. They enable to obtain quasi instantaneous accurate information on representative parameters of heat exchangers fouling degree by disturbing only very little the conditions to which they are subjected. Although the methods developed during this study are adaptable to other configurations, we have chosen in restrictive way to work on gas side particulate fouling of tubular heat exchangers. The first sensor, using a hot source probe, enable to accurately estimate not only the convective heat transfert coefficient but also the deposit thickness from a reliable transient state estimation method. The second sensor enable to accurately estimate the convective heat transfer coefficient angular distribution as well as the one of deposit thickness from a steady state estimation method. These two devices have now to be tested under real conditions of using by a systematic study in industrial processes. They represent predictive maintenance specified tools.
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https://pastel.archives-ouvertes.fr/pastel-00000984
Contributor : Ecole Arts Et Métiers Paristech <>
Submitted on : Wednesday, January 19, 2005 - 8:00:00 AM
Last modification on : Wednesday, January 19, 2005 - 8:00:00 AM
Long-term archiving on: : Thursday, June 30, 2011 - 1:15:08 PM

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Laetitia Perez. Development, study of performances and integration of thermal probes for fouling characterisation of tubular heat exchangers. Engineering Sciences [physics]. Arts et Métiers ParisTech, 2003. English. ⟨NNT : 2003ENAM0025⟩. ⟨pastel-00000984⟩

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