Development of a Computational Model of Venturi Scrubber to Simulate Its Performance for Filtered Vented Containment System
Venturi scrubber is very effective device for air pollution control. In an industry venturi scrubber is very efficient to remove micron size dust particles by injecting water droplet. Dust particles collide with the water droplet by inertial impaction at the throat section of venturi scrubber and deaccelerated at diffuser section to allow pressure recovery. Performance of venturi scrubber is assessed in terms of collection efficiency and pressure drop. Venturi scrubber is mostly used in Filtered Vented Containment System (FVCS) for removal of radioactive fission products in Nuclear power plant in severe accident. The purpose of the present study is to design a venturi scrubber to achieve a high overall efficiency in removing radioactive particulate iodine- 131 by CFD simulation. Mesh is developed by Gambit 2.4.6 and Ansys Fluent 15 is used to predict the pressure drop profile inside the venturi scrubber. From a physical point of view, scrubbing process follows liquid injection, the droplet formation, droplet break up and particle capturing mechanism. TAB model is considered to predict the droplet break up. Iodine of diameter 1 µm is used as dust particle. Flow field inside venturi scrubber is simulated by K-ε Turbulence model and trajectory of dispersed particle is modelled using lagrangian frame of reference. Finally the results shows the effect of gas velocity and liquid mass flow rate on pressure drop and this study also investigates the overall collection efficiency of venturi scrubber for different throat gas velocities and various mass flow rate of liquid inlet.
KeywordsDroplet break up Venturi scrubber Overall collection efficiency Fluent Nuclear power plant
- Ali, M., Changqi, Y., Zhongning, S., Jianjun, W., HaiFeng, G.: Analysis of liquid fraction in venturi scrubber by E-E method using CFX. Res. J. Appl. Sci. Eng. Technol. 4(19), 3830–3833 (2012)Google Scholar
- Lehner, M.: Aerosol separation efficiency of a venturi scrubber working in self-priming mode, pp. 390–402. Aerosol Science and Technology (2007)Google Scholar
- Mohebbi, A., Taheri, M., Fathikaljahi, J., Talaie, M.R.: Simulation of an orifice scrubber performance based on Eulerian/Lagrangian method, J Hazard. Mater. A100, 13–25 (2003)Google Scholar