Experimental Study on Scale-Up of Solid–Liquid Stirred Tank with an Intermig Impeller

The scale-up of a solid–liquid stirred tank with an Intermig impeller was characterized via experiments. Solid concentration, impeller just-off-bottom speed and power consumption were measured in stirred tanks of different scales. The scale-up criteria for achieving the same effect of solid suspension in small-scale and large-scale vessels were evaluated. The solids distribution improves if the operating conditions are held constant as the tank is scaled-up. The results of impeller just-off-bottom speed gave X = 0.868 in the scale-up relationship NDX = constant. Based on this criterion, the stirring power per unit volume obviously decreased at N = Njs, and the power number (NP) was approximately equal to 0.3 when the solids are uniformly distributed in the vessels.

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