METHODS AND APPARATUS FOR CONDITIONING POWDERS

摘要

The application discloses method and apparatus for conditioning powder, particularly food ingredients such as flour for which temperature is important at the onset of processing. The powder is fed batchwise into a conditioning column (2) defining an internal conditioning space, and having a base construction (1) with a conical gas-permeable membrane in between. Gas, pre-conditioned as to temperature and moisture, is blown up through the membrane (9) to fluidize the powder above. The gas flow is distributed so that powder lying over higher-flow regions spills over on to lower-flow regions, creating a circulation of powder in the column and efficient conditioning. Powder can be discharged through a central port (10) at the column base, controllable by an automated discharge valve (3). The port and/or valve may also have gas-blowing surfaces to maintain a free discharge flow of powder and to keep the valve sealing surfaces clear.