METHOD OF AUTOMATIC CONTROL OF DRYING PROCESS Russian patent published in 1998 - IPC

FIELD: automation of technological processes; automation of process of drying of thermoliable materials, for example grain. SUBSTANCE: method consists in separation of flow of used drying agent into main flow which is fed for preliminary heating of moist product and additional flow which is mixed with fresh drying agent. After preliminary heating of moist product, main flow of used drying agent is first fed to evaporator for drying and then to condenser, after which this flow is directed to line of mixing used drying agent of additional flow and fresh drying agent fed for replenishment and finally it is fed to drier, thus forming closed cycle of main flow. Flow rate and temperature of drying agent at drier inlet are corrected according to measured additional parameters; excessive moisture is discharged together with part of used drying agent. EFFECT: improved quality of drying; reduced power requirements and ecological safety of process. 2 cl, 1 dwg