Bevel-helical gearbox B4 r unit type Bevel helical gear unit type H H H B4-FH-22-D

Flender/Flender Gear Units/Bevel-helical gearbox B4

without extensive numerical simulation calculations. In the final phase of the project, simple experiments with real combustion aerosols were per- formed in order to investigate whether or not sensor based on the principle oflaser-induced aerosol fluorescence can be used for measuring PAHs in real combustion processes. After being excited tofluorescence, thesignalsfrom cigarettesmoke, diesel exhaust gas, and re-dis- persed filter dust from refuse incineration plants, additionally coated with BaP, displayed remarkably high intensity. The fluorescence spectra recorded corresponded to the spectral distribution to be expected on the basis of the adsorbed PAHs present. The fluorescence in- tensityof BaPonfilterdustwas 5% higherincomparisonwiththatobserved using NaClasthe substrate.This im liesa weaker interaction of the BaPwith the silicatesand metal oxides of the filter dust aerosorthan withthe crystal lattice of sodium chloride. The sensor set-up realised proved to have very good detection efficiency. In the case of indivi- dual PAHS, concentrations down to 5 ng/m3 (benzo[]fluoroanthene) could be detected. The ekperiments performed show that the sensor set-up constructed is well suited to the . hi hly efficient detection of various PAHS. The individual components of the coating can be seqected and quantified in fairly simple mixtures. It must, however, be em hasised that the example, because interaction of the adsorbate with the surface lattice o8he carrier aerosol can result in quenching of the fluorescence, or even spectral shifts. During the roject, it became evident that PAHsadsorbed on aerosols can in some cases be dif- ferentiateton the basis of their widely varying fluorescence decay times. However, evaluation of the time-resolved spectral data for processes multicomponent mixtures which no longer decay in monoexponential manner requires extensive numerical procedures, which should ermit spectral and temporal resolution of individual comp