Report 94.3.TT.4345, Transport Engineering and Logistics.
Pneumatic conveying involves the transportation of solids in a gas stream.
The gas stream transports the solids through the pipeline. Feeding of the
solids in the installation is done by a feeding device; at the end of the
system the solids are separated by a solids separator.
There are two modes of pneumatic conveying: negative and positive pressure
systems. In this report positive pressure systems are discussed. These systems
can be classified in two categories: dilute phase and dense phase systems.
In the dilute phase the gas stream carries the discrete particles, in the
dense phase a certain proportion of the solids is conveyed. This work
focusses on dilute phase conveying.
In pneumatic conveying the properties of the solids are very important,
the most important are the density of the solid, the particle size, the
permeability and the aeretention of the solids. The most of these properties
have to be determined by empirical tests.
The most important data for desinging an installation are the volumetric flow
of air, the pipe diameter, pressure drop and the power, which is needed for
the conveying. There are much methods available for the design of a pneumatic
conveying installation. In this work, first the theoretical way to calculate
the pressure drop is discussed, then a more practical method of calculation is
presented, which uses the empirical numbers. Eventually a working example is
given of a chosen design method with the empirical numbers. The most
builders of this installations use experimental data, rules of thumb, data
from literature, etc.
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