Control process of the thermal level of a solid in a heat...

B - Operations – Transporting – 01 – J

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Details

B01J 8/24 (2006.01) B01J 8/08 (2006.01) B01J 8/18 (2006.01) B01J 8/28 (2006.01) B01J 8/38 (2006.01) C10G 11/18 (2006.01) F28D 13/00 (2006.01)

Patent

CA 2162701

Method for controlling the heat level during the continuous processing in a fluidized bed of a pulverulent solid, whereby said solid is processed in a fluidized bed processing zone, at least a portion of the solid is drawn off from the zone and conveyed to an external heat exchanger (21) containing at least a bundle (22) of heat exchanging tubes in which a vaporizable cooling fluid circulates, after which a thermal control process is effected in a fluidized bed by indirect heat exchange with the fluid, and the heat controlled portion is drawn off to be recycled in the processing zone or in another processing zone (1). In particular, the portion of the solid is circulated downwards by means of an inert or non-inert fludization fluid, in the fludized bed and over the tube bundle (22) which is wound in such a way that the solids stream crosses the tubes, and the cooling liquid is circulated in a single direction in the tube bundle. The invention applies to catalytic cracking of petroleum feedstocks.

L'invention concerne un procédé de régulation du niveau thermique dans un traitement en lit fluidisé et en continu d'un solide pulvérulent, dans lequel on effectue un traitement de ce solide dans une zone de traitement à lit fluidisé, on soutire de la zone une partie au moins du solide, on envoie cette partie du solide dans un échangeur (21) de chaleur externe contenant au moins un faisceau (22) de tubes d'échange thermique dans lequel circule un fluide de refroidissement vaporisable, on procède à une régulation thermique en lit fluidisé par échange de chaleur indirect avec le fluide, on soutire la partie du solide ainsi régulée pour la recycler dans la zone de traitement ou pour la recycler dans une autre zone (1) de traitement. Plus précisément on fait circuler de manière descendante au moyen d'un fluide de fluidisation inerte ou non, en lit fluidisé, la partie du solide sur le faisceau (22) de tubes qui est enroulé de telle façon que le courant de solide croise les tubes et on fait circuler le fluide de refroidissement dans le faisceau de tubes selon une seule direction. Application au craquage catalytique de charges pétrolières.

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