Photo-CREC Water-Ill Reactor

FIGURE 2.13. Schematics lepiesentation of Photo-CREC Water-m reactor Solar photocatalytic reactor simulator. 

The reactor is in adiated externally by a set of 8 UV-lamps each of them supplying 15 watts nominal power. The radiation field distribution can be measured using a fiber optic sensor placed inside a concentric inner tube with this sensor device connected to a spectrophotoradiometer. Hie external illumination permits the simulation of solar irradiation whereas the combination of internal and external illumination allows the smoothing of the radiation field radial distribution and the increase of iiTadiation efficiency. 

FIGURE 2.14. Schematic diagram of the Photo-CREC-Air unit set-up (AIChE Journal Copyright 2004, Vol. 50, Issue. 5,Wiley InterScience, p. 1017-1027). 

The Photo-CREC-Air unit operates in a batch mode with a given amount of model pollutant injected in a set volume of air. Model pollutants ai e vaporized almost instantaneously and mixed intimately with the air stream. 

Development of the Photo-CREC-Air reactor also involved the characterization of fluid flow patterns in the unit and the assessment of the UV radiation reaching the impregnated mesh. The fluid flow pattern calculation and the fluid flow visualization can be developed using CEX-4.3 software for fluid flow simulation. A plane of symmetry in both the x and y directions can be assumed by simulating the flow patterns in the Venturi section. Hiis enables the sub-division of the reactor s physical volume into 4 quarters. This makes possible the use of smaller cell sizes and an improved convergence (Ibrahim, 2001). 

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