Experimental results on the mixing characteristics of a negative pressure air mixer show that the importent control parameters to effect good mixing are the lnltlal pressure difference, bed depth, and particle sizes. The negative pressure air mixer operates by alternate evacuation of the air (or other gas) from the vessel and injection of the air to cause agitation. With this device, better mixing is created by increasing the duration of the injection rather than by increasing the intensity of mixing for particles that do not have substantially different densities. On the other hand, the intcsnslty of trdxing is more knportant when the particle densities differ considerably. The experimental results are interpreted in terms of the phase diagram of the bed and with a one-parameter stochastic model. The stochastic model represents the efficiency of mixing quite well.

This paper is concerned with an experimental Investigation of the effect of guide vanes on dust collection efficiency for a straight-through cyclone, with the suction of dust-laden air by means of a secondary rotational air charge. Four kinds of dusts were used for the experiments of dust collection efficiency. It was found that the present type of straight-through cyclone is capable of achieving a comparable performance with the reverse-flow cyclone and Is especially suited to removing dust from the hot exit gas from furnaces.

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