Using the results of earlier work on the flow pattern of gas and solids in a draft‐tube spouted bed, the drying characteristics of such a spouted bed are discussed. Paddy (unpeeled rice) was dried in a 30 cm bed with a 5.5 cm draft tube and temperatures and moisture content of solid and gas phase were measured as a function of drying time at various points in the system. It appears that the (constant) drying rate is determined by the heat transfer in the recirculation zone (just above the air inlet) and in the draft tube. After the short and rapid heating in the tube, the temperature and moisture gradients in the particle equilibrate in the annulus. It is concluded that a draft‐tube spouted bed is a promising dryer design for heat‐sensitive particles with slow intra‐particle mass transfer coefficients.
A study of a spouted bed combustion through direct visual observation in a half cylindrical bed (9 cm ID x 50 cm height, flat based) is reported. The different combustion modes are described as a function of the massflow of the gas mixture entering the bed and of the ratio of air to combustible. These combustion modes have been analyzed and documented with the aid of colour cinematography and photography. Bed temperatures have also been registered. Various bed heights of sand and different sizes of the orifice have been used.
Das Geschwindigkeitsverhaltnis wird darin aus der Partikelsinkgeschwindigkeit, bei der die Verteilungssumme der Partikeln 50% betragt, zur mittleren Fluidgeschwindigkeit bestimmt. In unseren Rechnungen wurde eine Verteilungsfunktion D ( d ) nach Rosin-Rummler-Sperlirzg benutzt, von deren Parameter n der Sedimentationsgrad ebenfalls abhangt. Die Berechnung der Sedimentation fur kreisformige Rohre erfolgt in entsprechender Weise.
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