MODE OF AUTOMATIC CONTROL OF A DRYING PROCESS Russian patent published in 2006 - IPC F26B25/22 

FIELD: the invention is designed for automatic control of a drying process and may be used at automatization of barley malt drying process.

SUBSTANCE: the mode is in that a wet product is preliminary heated with a flow of processed drying agent with following drying and cooling. The drying of the product is executed in three drying zones with following cooling, with using of a heat pumping installation fulfilled two-stage. At that after preliminary heating of wet product the processed drying agent is successively directed at first into the evaporator of the second stage and into the evaporator of the first stage of the heat pumping installation and then into a heat-exchanger-recuperator which is installed on the flow of the drying agent between the evaporator and a condenser of the first stage of the heat pumping installation and further into a condenser of the first stage of the heat pumping installation. At that its one part is directed into the condenser of the second stage of the heat pumping installation with following feeding into the third drying zone and the other part into the first drying zone and the flow of the drying agent into the second drying zone is received by way of mixing of the part of the drying agent fed into the first and the third drying zones, additionally the temperature of the product is measured in the drying zones and the air temperature is measured after cooling, in accordance with received information about the temperature of the product in the drying zones one can determine consumption , temperature of the drying agent fed in the zones by way of influencing on the power drives of the compressors of the first and the second stages of the heat pumping installation, a ventilator drive and correlation of the flows of the drying agent fed in the first and in the third drying zones. In accord with the measured temperature of the product after cooling consumption of cooling air feeding in the heat-exchanger-recuperator. Stabilization of final moisture of the product is fulfilled by way of changing time of presence of the product in the dryer.

EFFECT: increases quality and energy effectiveness of a drying process.

1 dwg