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The analysis of changes in moisture, equivalent diameter of the granules, layer porosity and size variation under the abrupt perturbing effect on the input humidity of the charge was made. The change in other parameters from the charge moisture lags about 30 seconds. This is due to different mass transfer rates for moisture and fine fractions. PI-controller settings for control of all measured parameters were calculated. The best indicators of the transition process comply with the control of moisture content of the charge. However, the most representative is the simultaneous control of these parameters. A new indicator of the effectiveness of the shower unit of the pelletizer drum is developed, based on the difference in the rates of mass transfer of moisture and solid particles. The value of this indicator should be kept to a minimum.
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