Positive Physical Control vs. Indirect Control
The two primary means of conveying bulk products are by pneumatic and mechanical conveying with the most common type of mechanical conveyor being the screw conveyor. Both methods have benefits in certain applications over others. In general, finer, more consistently sized materials as well as some granular and pelletized materials work well with pneumatic conveyors whereas larger, irregularly sized materials, as well as moist, doughy, and packable materials work better with screw conveyors. However, in the middle reside the majority of materials for which both systems could be appropriate.
In cases where either system could be used, sometimes previous hassles or perceptions of pneumatic conveying problems may lead engineers to use a screw type system. Let’s review three of these and consider why engineers should not be hasty to rule out pneumatic conveying - in fact how to overcome these problems to make pneumatic conveying more reliable.
3 Pneumatic Conveying Challenges:
1. Justifying Investment in “Complex” Pneumatic Systems