ABSTRACT
A vast number of different materials are conveyed in both the food and chemicals industries. Probably as a consequence food and chemical products tend to have a reputation for causing more problems in both the design and operation of pneumatic conveying systems than any other group of materials. They can exhibit an extremely wide range of conveying capabilities; certainly wider than those of coal and ash considered in the previous chapter, and their conveying performance can also vary during conveying. As with most materials, there is a dilute to dense phase capability limitation, but with food and chemical products there is a more pronounced divide between moving bed and plug type flows, for those materials that are capable of being conveyed in dense phase.
