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Simualtion of Two-Phase Gas-Solid Flow in Electrostatic Precipitator to Increase Particulate Collection Efficiency Using Plate with Aerodynamic Bulges

Yadollahpour Kebria, Hossein | 2023

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56510 (45)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Darbandi, Masoud; Zakeri, Ramin
  7. Abstract:
  8. Electrostatic precipitators (ESPs) are widely recognized for their pivotal role in the collection of dust and particulate matter. ESPs are essential to ensure a particle- and dust-free atmosphere in industrial and non-industrial work environments. With the ever-increasing significance of maintaining air quality at the desired standards, the role of ESPs has gained paramount importance in mitigating airborne pollutants and protecting public health. Achieving higher collection efficiency for particulate matter and attaining cleaner air is of great importance in the design and selection of precipitators. On the other hand, particle collection efficiency is considered as a crucial factor for ESP that can be relied upon to evaluate its overall performance. One of the major components of ESP system having a significant effect on its efficiency and performance is the collecting plate. In the previous research efforts, various geometries for the collecting plate have been proposed and extensively investigated and compared with each other both numerically and experimentally to enhance the precipitator efficiency as much as possible. These studies have mostly analyzed the influence of electrode shape on particle capture. The present research proposes an aerodynamic structure for the collecting plate in order to maximize the efficiency of the base precipitator. To investigate the effectiveness of this aerodynamic plate compared to the different collecting plate geometries investigated in the previous studies, numerical simulation of these plates is conducted using the COMSOL software. The simulations involved the implementation of the NACA 0012 half-airfoil geometry and its analysis and comparison with other geometries, including flat-plate, triangular, corrugated, convex, and wedge-shaped obstacles. In a preliminary investigation, the simulation results demonstrate the superior performance of the half-airfoil aerodynamic geometry compared to the conventional flat-plate configuration. The aerodynamic design exhibits a fair increase in the collection efficiency, surpassing the performance of other geometries considered in this study. In short, the current results show a 5% improvement in efficiency compared to the flat-plate geometry. The efficiency of the flat plate and half-airfoil plate is about 55% and 60% respectively, at the applied power of 10 watts. Overall, the half-airfoil geometry improves the particulate precipitation efficiency due to the enhancement of the flow behavior in the particle transport paths to the collecting plate
  9. Keywords:
  10. Numerical Simulation ; Collection Efficiency ; Aerodynamic Design ; Electrostatic precipitator (ESP) ; Two Phase Gas-Solid Flow ; Air Particulate Matter

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