ELECTROSTATIC ENHANCEMENT OF DUST SEPARATION IN A NOZZLE SCRUBBER

A commercial wet particle separator is considered for electrostatic en hancement. This so-called Modular Nozzle Scrubber (MNS) is already in use to clean the exhaust gas of a steel company in Lint, Austria. It i s well known, that many mechanisms are involved when dealing with char ged droplets and charged particles. Mechanisms considered here are Spa ce-charge Precipitation, Charged Droplet Scrubbing, Charged Droplet Pr ecipitation and Electrostatic Precipitation. It is not yet the objecti ve of this work to find that set of operating parameters, which gives the highest grade efficiencies. But experimental set ups and calculati ons are presented on how to segregate the various mechanisms. Some gen eral theses are made on the question how the final grade efficiency ca n be calculated from single independent mechanisms. It is examined, ho w single mechanisms influence each other. The Charge Droplet Precipita ting Mode is found to give best results. This can be shown not only wi th the experimental results for the grade efficiencies, but also concl uded from the number of droplets lost due to the Space-charge Precipit ation of the droplets. The space charge field, produced by the charged droplets, is measured as well as the droplets lost to the boundary of the pipe.