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Développement d'un échangeur de chaleur gaz-solide à contact direct en utilisant un cyclone à écoulement axial.

Development of gas-solid direct contact heat exchanger by use of axial flow cyclone.

Auteurs : SHIMIZU A., YOKOMINE T., NAGAFUCHI T.

Type d'article : Article

Résumé

A heat exchanger between particulate or granular materials and gas is developed. It makes use of a swirling gas flow similar to the usual cyclone separators but the difference from them is that the swirl making gas is issued into the cyclone chamber with downward axial velocity component. After it turns the flow direction near the bottom of the chamber, the low temperature gas receives heat from high temperature particles supplied from above at the centre of the chamber. Through this configuration, a direct contact and quasi counter-flow heat exchange pattern is realized so that the effective recovery of heat carried by particles is achieved. A model heat exchanger was manufactured via several numerical experiments and its heat exchange performances as well as particle recovery were examined. Attaching a small particle diffuser below the particle-feeding nozzle brought about a drastic improvement in the heat exchange performance without deteriorating the particle recovery efficiency. The outlet gas temperature was much higher than the particle outlet temperature finally obtained, which is never realized in a parallel flow heat exchanger.

Détails

  • Titre original : Development of gas-solid direct contact heat exchanger by use of axial flow cyclone.
  • Identifiant de la fiche : 2005-0617
  • Langues : Anglais
  • Source : International Journal of Heat and Mass Transfer - vol. 47 - n. 21
  • Date d'édition : 10/2004

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