Laseroptische Charakterisierung von Vollkegel- und Hohlkegel-Sprays

Spray absorbers are widely used to remove SO2 from flue gases of large coal-fired power-plants or garbage incinerators. In such scrubbers the SO2 is absorbed by a suspension of water and lime. The suspension is dispersed by nozzles to obtain a large interfacial area. The design of scrubbers is usually done with the dropsize distribution obtained from tests on single nozzles dispersing water, assuming that the data reflect the actual dropsize spectrum in a typical scrubber with hundreds of closely spaced nozzles. However these single nozzle experiments do not take into consideration the effect of: 1.) the different reological properties of water and lime slurry, 2.) droplet collision followed possibly by coalescence and disruption events. The aim of this work is to obtain knowledge about the: 1.) influence that the different properties of water and slurry have on the droplet distribution and the velocity profiles in the spray, 2.) droplet distribution and the velocity profiles in the interacting zone of the spray cones. Special attention was given to the different characterisation of full-cone and hollow-cone nozzles.