To suppress effectively fugitive dust emissions using water spraying systems at bulk solids handling an
optimal design of these devices is necessary. The dust suppression mechanism for example at conveyor belt hand over points can be subdivided in a primary and a secondary dust minimization effect. In this
case the moistening of the bulk solids is a primary dust minimization effect and the airborne dust capture
is a secondary dust minimization effect. In this work the evaluation of both dust minimization effects is
carried out. As a first step an experimental investigation of the total and the secondary dust suppression
efficiency took place. A model of two separators which are acting in series got used to compare the measured
efficiencies and to calculate the primary dust suppression efficiency. The secondary dust suppression
effect showed low performance compared to the primary dust suppression efficiency. So it has to be
clarified if the streaming situation and the dust concentration situation at the position where the nozzle
operates can get improved. Therefore enquiries at different positions in the middle and aside a concentrated
particle flow got carried out.
The results provide an informative basis how water spraying systems can get improved to suppress
fugitive dust emissions at bulk solids handling.