Verfahren und Vorrichtung zur Herstellung von Granulaten durch Wirbelschicht-Sprühgranulation

摘要

The invention concerns a process for producing granulates by fluidised bed spray granulation and a device therefor. Liquid starting substances can be converted into granulates by fluidised bed spray granulation. In order to ensure a high material throughput, a large number of nozzles which are also sensitive to blockages and encrustations must be installed. The invention makes it possible to avoid the drawbacks of prior art processes in that at least two at least partly facing spray nozzles (8) are arranged and the sprayed quantities are set in such a way that their sprays meet within the fluidised bed and there is no substantial overspray on a surface (4) bordering the fluidised bed or from the bed itself. The sprays from two facing spray nozzles meet either frontally or enclose an angle of less than 180 DEG ; this angle is preferably between 150 and 180 DEG . The device of the invention comprises a flow channel (1) with lateral spray nozzles (8), whereby two precisely or staggered opposite spray nozzles are directed in such a way that the sprays meet within the fluidised bed.