Simulation of a Venturi scrubber using a one-dimensional model for capturing dust particles with liquid droplets
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EMC 2009 Innsbruck
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Micron sized dust particles are known to have a fatal effect on human bodies, especially the lungs and the heart. Therefore the standards for air pollution control are becoming increasingly stringent, so that there is a demand for more effective pollution control technologies. One of the classical types of air pollution control are Venturi scrubbers. Their advantages include a high efficiency for small particles, low capital costs and maintenance costs.
Since the major operation cost of a Venturi scrubber is determined by the pressure drop, many computational models for the prediction of pressure drop are available . A model that is proposed by Boll  agrees reasonably well with experimental data . A slightly modified version of this model is implemented in MATLAB and tested against experimental data , .
Many of the available models for the calculation of pressure drop and dust capturing efficiency assume the droplets to be mono-dispersed spheres of a constant, empirically determined diameter.
To eliminate this deficiency, the following procedure is applied: Knowing the initial droplet size distribution, the scrubbing liquid is modelled by droplet trajectories, each representing a certain diameter and mass flow rate according to the initial size distribution. As a result of the shear forces acting on the droplets, they will disintegrate into smaller droplets. After the breakup process, the trajectories represent more droplets of smaller diameters.