The residence time distribution (RTD) in a pilot plant spray dryer was characterised for two kinds of air distributors (centrifugal and parallel flow) and for different atomizing air pressures. To determine the RTD - and the RTD of different particle size fractions - the particle concentration and size at the dryer outlet was measured continuously using a particle counter. Results were modelled using the Bodenstein number and the CSTR in series model. An increasing nozzle pressure leads to a decrease in mean residence time and a more narrow distribution. The influence of nozzle pressure is more pronounced than of air distributor and particle size fraction. Keywords: Residence time distribution; Particle size; Bodenstein number modelling; Nozzle influence; Mechanism of air distribution

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In diesem Beitrag werden die Highlights der auf der ACHEMA 2022 ausgestellten Neuerungen zusammengefasst und es wird über die beobachteten Trends berichtet. Neben neuen Anlagen in einzelnen Trocknungsbereichen wurden die Schritte der Firmen in den Bereichen der Schwerpunktthemen Digitalisierung und Nachhaltigkeit näher betrachtet.

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