RECENT INVESTIGATIONS WITH NOZZLE SCRUBBERS

The nozzle scrubber is a wet separator simple in design and robust in operation. Hence, it is well suited for installation in existing plant s and, generally, a more powerful fan can be forgone since the energy needed to disperse the scrubbing liquid is not delivered by the crude gas (as in the case with venturi scrubbers). All parameters relevant f or operation such as specific water consumption, residence time and sp ecific energy consumption have been investigated in detail, and differ ent pneumatic atomizing nozzles (with internal and external mixing of both phases) in various geometrical arrays are examined. The design cr iteria for the use of the nozzle have been worked out. The effect of p article generation by vaporizing liquid droplets, has for the first ti me been examined and quantitatively proven on a technical wet scrubber . The results plainly refute the assumption that the concentration of particles realized by the evaporation effect is negligibly low. Possib ly contaminations with mass concentrations up to some mg/m(3) are emit ted at which the median of mass density distribution (x(50,3)) amounts to 0.05 mu m.