| 摘要 |
A method, an apparatus and a plant for sterilization and/or heat treatment of products in particle form, for example bone meal, said product being introduced in batches into a pressure vessel which lies substantially horizontal, in that said pressure vessel is arranged to rotate and is provided on the inside with a built-in helical vane arrangement along the inner wall/jacket of the pressure vessel. The pressure vessel (5) is closed and evacuated of air and heated, said heating being effected by supplying steam to the vessel's jacket (4) and also possibly by the supply of steam under pressure to the inside of the vessel. The heating and pressure treatment is effected for a given period of time, in that the process parameters are a function of the product to be treated. The pressure vessel is made to rotate, said rotation giving rise to a mixing/movement of the particle-formed product and, as a consequence of the inner vane arrangement, the movement of the product from the one end of the vessel to the other. The process vessel is then relieved of pressure, after which the heat treated/sterilized product is emptied from the process vessel and the batch process starts from the beginning. There is hereby achieved an apparatus and a method with a continuous and uniform mixing and sterilization of the product with optimum utilization of the vessel's capacity, while at the same time there is little risk of defects arising in the apparatus and during the process itself.
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