Fortschritte bei der Auslegung pneumatischer Förderanlagen

Advances in the design of pneumatic conveyors. Pneumatic conveyors can be constructed for a variety of flow conditions, such as, e. g. dilute phase conveying, strand conveying or plug-flow conveying. The choice of the most favourable flow condition is naturally determined by the particular problem at hand, and, in particular by the physical data of the solid to be conveyed. In practice, when designing such conveyors, not only the processes taking place in the pipeline have to be taken into account but also those taking place during the feeding and separating of the solid, since these jointly influence the flow conditions of the whole system. The choice of fan is of considerable importance. The accuracy of the precalculation of pressure drops and the criteria for the choice of the most favourable gas velocity in the conveyor line are still unsatisfactory, in spite of the many previously confirmed findings. More recent investigations on the prediction of various flow conditions and on plug-flow conveying enable a better choice of the most favourable method of conveying. Significant technical developments have been made, especially as regards calculated plug-flow conveying.