Experimental results for gas-solid separations in a 102 mm diameter conventional cyclone operated with air heated to temperatures between 300 K and 2 000 K, are presented. Overall and fractional collection efficiencies were measured for alumina and silica having particle sizes of 100% less than 44 pm and mass median diameters of 5.0 and 10.0 pm respectively. Inlet velocities ranged from three to 42 rn/s and inlet dust loads were between 0.3 and 235 g/mi. The dust load had a strong intluence on the collection efficiency and the loading effect was stronger at high temperatures.On presente des resultats experimentaux pour les separations gaz-solides dans un cyclone conventionnel de 102 mni de diarnktre fonctionnant B I'air chauffe B des temperatures comprises entre 300 et 2 000 K. Les efficacitks de recuperation fractionnelle et globale ont t t C mesurees pour des alumines et des silices ayant des tailles de particules h 100% inferieures a 44 pm et des diametres moyens massiques de 5,O et 10.0 pm, respectivement. Les vitesses d'entree varient entre 3 et 42 rn/s et les charges de poussieres d'entree entre 0,3 et 235 g/m'. La charge de poussikres a une grande influence sur I'efficacitC de rCcupCration et I'effet de charge est plus grand h temperatures ClevCes.

Experimental results are presented for a study of gas and particle flows in a 102 mm diameter conventional cyclone operated at temperatures between 300 and 2000 K. Inlet gas velocities ranged from 3 to 42 m/s. Particle deposition patterns and the measurements of local pressures were used to determine the flow patterns and velocity profiles within the cyclone. A “Reynolds Number” has been defined based on the mean inlet velocity and the hydraulic diameter of the annulus between the cyclone wall and the gas outlet duct. An empirical equation was derived to correlate the ratio of the wall tangential velocity to the mean inlet velocity with this Reynolds Number.