In order to design optimal water spraying devices to minimize fugitive dust emissions generated at bulk solids handling the physical mechanisms responsible for their arising and their precipitation have to be understood. The dust suppression mechanism at bulk solids handling during water spraying can be divided into a moistening step of bulk solids, which prevents dust generation (primary dust suppression effect) - and secondly into a step by which the still generated dust particles will be captured by the water droplets (secondary dust suppression effect). This primary
and secondary dust suppression effects were compared. 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.