Visualization of water vapour flow in a packed bed adsorber by near-infrared diffused transmittance tomography

Méabh Nic An tSaoir, Daniel Luis Abreu Fernandes, Jacinto Sá, Michael McMaster, Kuniyuki Kitagawa, Christopher Hardacre, Farid Aiouache

    Research output: Contribution to journalArticlepeer-review

    Abstract

    This work presents a procedure based on spatially-resolved near-infrared imaging, in order to observe temperature and composition maps in gas-solid packed beds subjected to effects of aspect ratio and non-isothermal conditions. The technique was applied to the water vapour flow in a packed bed adsorber of low aspect ratio, filled with silica gel, using a tuneable diode laser, focal planar array detector and tomographic reconstruction. The 2D projected images from parallel scanning permitted data to be retrieved from the packing and above the packing sections of 12.0×12.0×18.2mm3 at a volume-resolution of 0.15×0.15×0.026mm3 and a time-resolution of less than 3min. The technique revealed uneven temperature and composition maps in the core packed bed and in the vicinity of the wall due to flow maldistribution. In addition, the heat uptake from the packed bed and local cross-mixing were experimentally ascertained by local profiles of the water vapour composition and temperature under various aspect ratios and feed flow rates. The relative deviations in temperature and compositions were 11.1% and 9.3%, respectively. The deviation in composition, which covers the packing and above the packing sections, was slightly higher than the deviation of 8% obtained up-to-date but was limited to the exit of a packed bed adsorber.

    Original languageEnglish
    Pages (from-to)6407-6423
    Number of pages17
    JournalChemical Engineering Science
    Volume66
    Issue number24
    DOIs
    Publication statusPublished - 15 Dec 2011

    Keywords

    • Adsorption
    • Near-infrared tomography
    • Packed bed
    • Porous media
    • Transport processes
    • Visualization

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