METHOD OF AUTOMATIC CONTROL OF VACUUM SUBLIMATION DRYING Russian patent published in 2005 - IPC

FIELD: drying thermolabile materials.

SUBSTANCE: method comprises measuring initial and final humidity of the product at the dryer inlet and outlet, respectively, temperature of the product at the outlet of the drum of the drier, temperature of coolant at the inlet and outlet of the desublimator, maintaining the residual sublimation pressure by discharging water vapor from the sublimation chamber, stabilizing current value of heat flux from the surface of the evaporator of the desublimator by changing power of the cooling machine compressor drive, measuring the flow rate of the product in the supplying pipeline, speed of rotation of the drum, and extent of its filling, residual pressure in the desublimators and temperature of coolant at the outlet from the desublimators and in the pipeline for supplying to them the hot coolant, and varying the flow rate of the product in the pipeline for supplying it to the dryer when the final humidity of the product at the outlet from the drier deviates from a given one until the extent of the drum filling reaches a permissible value and then the speed of rotation of the drum until the final humidity reaches a given value.

EFFECT: reduced power consumption and expanded functional capabilities .

1 dwg