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Use of the Distance Transform for Integration of Local Measurements: Principle and Application in Chemical Engineering

Published online by Cambridge University Press:  16 February 2016

Loïc Sorbier ,
Frédéric Bazer-Bachi ,
Yannick Blouët ,
Maxime Moreaud  and
Virginie Moizan-Basle
Loïc Sorbier*
Affiliation:
IFP Energies nouvelles, Rond-point de l’échangeur de Solaize, BP 3, 69360 Solaize, France
Frédéric Bazer-Bachi
Affiliation:
IFP Energies nouvelles, Rond-point de l’échangeur de Solaize, BP 3, 69360 Solaize, France
Yannick Blouët
Affiliation:
IFP Energies nouvelles, Rond-point de l’échangeur de Solaize, BP 3, 69360 Solaize, France
Maxime Moreaud
Affiliation:
IFP Energies nouvelles, Rond-point de l’échangeur de Solaize, BP 3, 69360 Solaize, France
Virginie Moizan-Basle
Affiliation:
IFP Energies nouvelles, Rond-point de l’échangeur de Solaize, BP 3, 69360 Solaize, France
*
*Corresponding author. loic.sorbier@ifpen.fr
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Abstract

We propose an original methodology to integrate local measurement for nontrivial object shape. The method employs the distance transform of the object and least-square fitting of numerically computed weighting functions extracted from it. The method is exemplified in the field of chemical engineering by calculating the global metal concentration in catalyst grains from uneven metal distribution profiles. Applying the methodology on synthetic profiles with the help of a very simple deposition model allows us to evaluate the accuracy of the method. For high symmetry objects such as an infinite cylinder, relative errors on global concentration are lower than 1% for well-resolved profiles. For a less symmetrical object, a tetralobe, the best estimator gives a relative error below 5% at the cost of increased measurement time. Applicability on a real case is demonstrated on an aged hydrodemetallation catalyst. Sampling of catalyst grains at the inlet and outlet of the reactor allowed conclusions concerning different reactivity for the trapped metals.

Keywords

distance transformintegrationEPMAcatalystelement profile
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 22 , Issue 2 , April 2016 , pp. 422 - 431
Copyright
© Microscopy Society of America 2016 

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