Improving the flow field in the inlet plenum of a fluidised bed

B - Operations – Transporting – 01 – J

Patent

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B01J 8/44 (2006.01)

Patent

CA 2290618

A gas plenum assembly for a fluidised bed apparatus, including a structure defining one or more side and base walls about a plenum chamber and means defining an inlet for gas to the chamber, arranged so that the gas flows generally upwardly into the chamber from the inlet. The assembly includes distributor means overlying the chamber, having multiple openings through which the gas exits the chamber for forming a fluidised bed above the distributor means. Means are disposed between the inlet and the distributor means for spreading the gas flow among the openings. The gas flow spreader means has a plurality of apertures for the gas flow therethrough, and the gas flow spreader means and the flow apertures are sized and arranged to substantially reduce cross-flow velocity of the gas at the openings.

L'invention concerne un ensemble à plénum à gaz pour appareil à lit fluidisé, comprenant une structure définissant une ou plusieurs parois latérales et de base autour d'un plénum et des moyens définissant une entrée permettant l'entrée du gaz dans la chambre, disposée de sorte que le gaz s'écoule généralement vers le haut dans la chambre depuis l'entrée. Ledit ensemble comprend un moyen distributeur sus-jacent à la chambre, ayant plusieurs ouvertures par lesquelles le gaz sort de la chambre pour former un lit fluidisé au-dessus du moyen distributeur. Des moyens sont prévus entre l'entrée et le moyen distributeur pour répartir le gaz entre les ouvertures. Le moyen de répartition du flux de gaz comprend plusieurs ouvertures par lesquelles le gaz s'écoule, ledit moyen de répartition et lesdites ouvertures étant dimensionnés et disposés de sorte que la vitesse d'écoulement transversal du gaz sensiblement réduite au niveau des ouvertures.

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