Faculty Mechanical, Maritime and Materials Engineering

Transport Technology

Literature survey, 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.

Reports on Transport Engineering and Logistics (in Dutch)

Modified: 2008.01.14; logistics@3mE.tudelft.nl , TU Delft / 3mE / TT / LT.