Inline-Messung von Schichtdicke, Agglomeratanteil und Sprühtrocknung beim Pelletcoating in der Wirbelschicht
Einsatz einer Inline-Partikelsonde als PAT-Instrument zur Echtzeit-Überwachung
Originale
Key Words Wirbelschicht-Pelletcoating | Wurster-Coating | Inline-Partikelsonde | Schichtdicke | Agglomeration | Sprühtrocknung | PAT | Partikelmessung
Abstract
Inline measurement of layer thickness, agglomerate percentage and spray drying for pellet fluidized bed coating – Application of an inline particle probe as PAT instrument for process control in real time
The layer thickness in the fluidized bed pellet coating process represents an important process variable for the plant operator. The measurement in real time may be applied to monitor the influence of spray drying, layer thickness growth during the process time and to determine the end of the process. Inline measurements of the film thickness by a Parsum particle probe IPP 70-S are presented in this work. Directions for use of percentiles x50,3 and x90,0 to the determination of film thickness are given by application of model calculations and coating runs in fluidized bed Wurster coaters GPCG 1.1 and GF3. Undesirable generation of agglomerates during the coating process becomes visible by means of the cumulative distribution by volume Q3(x) and the density distribution by volume q3(x). The formation of fine particles by spray drying and abrasion is visible by means of the percentile x10,0.
Korrespondenz:
Stefan Dietrich, Parsum GmbH, Reichenhainer Str. 34–36, 09126 Chemnitz, Germany; e-mail: dietrich@parsum.de
Zusammenfassung
Die Schichtdicke im Wirbelschicht-Pellet-Coatingprozess stellt für den Anlagenbediener eine wichtige Prozessgröße dar. Anhand ihrer Messung in Echtzeit kann der Einfluss des Prozessparameters Sprührate während des
