METHOD FOR AUTOMATIC CONTROL OF DRYING LOOSE PRODUCTS Russian patent published in 1994 - IPC

FIELD: automation of drying processes. SUBSTANCE: flow of worked out drying agent is divided into main flow, which is fed to preliminary heating of wet product, and additional flow, which is mixed with fresh drying agent. Moisture content of dried product is subjected to correction. If moisture content of dried product exceeds specified value, flow rate of worked out drying agent in additional flow is first decreased, then flow rate of heating steam fed to heater is increased; after that flow rate of drying agent is increased and relation of flow rates of wet and dry product in recirculation line is corrected by increasing flow rate of dried product in recirculation line and decreasing flow rate of wet product fed for drying. If moisture content of dried product is below specified value, first flow rate of worked out drying agent in additional flow is increased, then flow rate of heating steam fed to heater is decreased; after that flow rate of drying agent is decreased and relation of flow rates of wet and dry product in recirculation line is corrected by decreasing flow rate of dried product in recirculation line and increasing flow rate of wet product fed for drying. EFFECT: improved quality of drying loose product. 2 cl, 1 dwg