| 摘要 |
PURPOSE:To control the title drying tower conveniently by obtaining the appropriate number of injectors to be used at each stage from the expression relating to the number of injectors to be used and the bulk density and water content of spray-dried particles at each stage in the spray drying of a slurry resulting from washing, etc. CONSTITUTION:The upper and the lower group of nozzles 2 and 3 are provided in a spray drying tower 1, injection nozzles provided with the same orifice are used at the upper and the lower stage and the bulk density and water content are controlled by regulating the number of nozzles to be injected at the upper and the lower stage. Accordingly, a detector for detecting the bulk density and water content of spray-dried particles is provided in the spray drying tower. The number of nozzles to be used at each stage is determined from the deviation from the target bulk density and water content in an arithmetic controller on the basis of the results detected by the detector. A signal to regulate which nozzles at the upper and the lower stage are to be opened or closed is then outputted and the necessary nozzles are opened or closed in accordance with the signal.
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