METHOD OF AUTOMATIC CONTROL OF PROCESS OF DRYING OF DISPERSED MATERIALS UNDER ACTIVE HYDRODYNAMIC CONDITIONS Russian patent published in 2006 - IPC F26B25/22 

FIELD: food, chemical and allied industries.

SUBSTANCE: proposed method of automatic control of drying process in drier under active hydrodynamic conditions comes to changing of flow rates of flow rates of initial material and heat carrier by control signal. Signals are received from sensors measuring moisture content, temperature and consumption of drying agent before and after drier, initial and dried product, sensors measuring power consumed by fans and air heaters and all signals are supplied to microprocessor. The latter continuously determines sign of derivation of function of summary cost of energy and material per unit of mass of material under drying and if sign is positive, it reduces flow rate of initial material, and if sign is negative, increases the flow rate. Correction of drying process control conditions is effected in two levels. At first level, if current value of flow of moisture evaporated in some zone of drier differs from preset value, action is made on temperature and flow rate of tangentially delivered flow of drying agent, and at second level, if change of temperature and flow rate of tangentially delivered flow of drying agent does not provide required moisture content in dried material, action is made additionally on flow rate and temperature of axial flow of drying agent.

EFFECT: improved quality of drying, accuracy and reliability of control, reduced energy consumption.

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