Method and apparatus for producing microfine frozen particles.

摘要

The invention relates to an apparatus and method for the production of microfine frozen particles. A heat-insulated vessel (1) has a screen (5) dividing the inside of the vessel into an upper region (7a) of cold vapour and a lower region (7b) of cold vapour source. Means (8) atomises a material to be frozen so that atomised particles (14a) spray into the upper region. Means (4) supplies a cold vapour component into the lower region (7b) by injecting nitrogen gas into a refrigerant (12) contained in the lower region. The cold vapour component rises through the screen (5) and the atomised particles (14a) become frozen and the frozen particles fall to be collected by the screen and a collection pipe (6). The cold vapour component can also be supplied as refrigerated air or by ejecting a refrigerant together with the cooled gas into the lower region.