Drying of granulated materials. Part II. Drying of granules in rotary driers

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<jats:title>Abstract</jats:title><jats:p>The product of residence time (t), number of revolutions of the dryer per unit of time (n), ratio of diameter to length of the dryer.</jats:p><jats:p>(d/l) and the tangent of the angle of inclination (tan α) appears to be constant for every dryer; given by: tnd tan α/l.</jats:p><jats:p>The constant c depends on the construction of the dryer and is nearly inversely proportional to the number of steps into which die diameter of the dryer is divided by the lifter construction. The drying rate of granules which contain no soluble salts in a rotary dryer is smaller than in freely suspended state at the same Reynolds number of flow.</jats:p><jats:p>The ratio qudrying rate in a torary dryer/drying rate of freely suspended granules increases.</jats:p><jats:p>With the number of revolutions. n. Approximately. <jats:italic>q</jats:italic> = 1/4 to 1/5 when n = 10 r.p.m. and <jats:italic>q</jats:italic> ∼ n<jats:sup>0.5</jats:sup>. The experiments do nit allow quantitative conclusions to be drawn on the rate of drying in the second period. The rate of drying of nitrochalk granules in a rotary dryer proved to be the same as for freely suspended granules at the same temperature.</jats:p>

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