Verfahren zur kryogenen Abkühlung eines Pulvers

摘要

The cryogenic cooling of food or detergent fine powders in a tunnel (14) with a vibrating support (1), in which a controllable cryogenic liquid is introduced on the support. The powders are deposited on the support and another cryogenic liquid is introduced on the powders using an injector. Thermal mass of the powders is synchronized with powder supply as a function of time by controlling the cryogenic liquid in the tunnel. The synchronized information is transmitted to an acquisition unit and a data processor. The cryogenic cooling of food or detergent fine powders in a tunnel (14) with a vibrating support (1), in which a controllable cryogenic liquid is introduced on the support. The powders are deposited on the support and another cryogenic liquid is introduced on the powders using an injector. Thermal mass of the powders is synchronized with powder supply as a function of time by controlling the cryogenic liquid in the tunnel. The synchronized information is transmitted to an acquisition unit and a data processor. The content of the synchronized information, the acquisition unit and the data processors are retroacted on the supply of cryogenic liquid to ensure temperature of the powder at an exit of the tunnel. The cryogenic liquid is supplied through the valves and controlled through the acquisition unit and data processor by retroaction with respect to cryogenic liquid pressure reigning between the valve and the injector. The thermal mass of the powder is measured by determination of mass of product entering per unit time and by determination the temperature of the product in combination with determination of the powder mass throughput.