Simulation of a Venturi scrubber using a 1D-model for capturing dust particles
Sprache des Vortragstitels:
EMC 2009 European Metallurgical Conference
Sprache des Tagungstitel:
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. A classical type of air pollution control are Venturi scrubbers. Their advantages include a high efficiency for small particle separation, low capital costs and maintenance costs.
Since the major operation cost of a Venturi scrubber is determined by the pressure drop, many com-putational models for the prediction of pressure drop are available . A model that is proposed by Boll  agrees reasonably well with experimental data . In this paper a slightly modified version of this model is used.
Many of the available models for the calculation of pressure drop and dust capturing efficiency as-sume 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 distri-bution, the scrubbing liquid is modelled by droplet trajectories, each representing a certain diameter and mass flow rate according to the initial size distribution. The change of the droplets’ diameter due to break-up is modelled by the Taylor Analogy Break-up (TAB) model .
In this paper, the performance of a Venturi scrubber, represented by pressure drop and dust captur-ing efficiency, is investigated by means of a one-dimensional trajectory model. Thus, insight into the physics of the scrubbing process is obtained that gives useful information for design and opera-tion of Venturi scrubbers. The calculated results are tested against experimental data , .