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Improving the Performance of the Electrostatic Precipitator Used in Cement Plant

Sabah Kadhm Alkaabi, Dhiyaa | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 54489 (58)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Sadrhosseini, Hani; Pasharavesh, Abdolreza
  7. Abstract:
  8. Electrostatic precipitators are widely used in cement plants to remove impurities and dust from the exhaust gases. The filtration mechanism is based on using high intensity electric fields which first ionize the particles and then absorb them toward the collecting electrodes. The corrosion effect is one of the major problems associated with electrostatic precipitators which not only can negatively affect their operation efficiency but also decreases their life-time through breakage occurrence in the corroded electrodes. One of the commonly used methods to suppress this negative effect and increase the total working hours of the device is to cut the bottom part of the first collecting plate of each row because they are the most exposed places to dust and corrosion. In this thesis, both the analytical and computer simulation analyses are employed to first determine the distribution of the corrosion rate over the electrodes and then investigate how the efficiency of the system is affected when the parts of electrodes with highest corrosion rate are cut. The simulations are carried out using COMSOL Multiphysics software package. To do that first a particle tracing is performed as the flow passes through the region between the electrodes and then the current density over the surface of the electrodes is calculated. Results indicate that the dust particles mostly gather on both ends of the upper and lower collecting plate, while bringing the effect of gravity into account one can conclude that the highest particle concentration occurs at the bottom. Cutting of these high concentration parts leads to a reduction in the collecting area compared to the original design of the precipitator which leads to a decrease in the overall collecting efficiency. However, analytical calculations show that the efficiency is decreased by only a very small percentage. That is while using this method the designers have the opportunity to benefit from the longevity of the precipitator resulting from reducing the impact of the corrosion problem
  9. Keywords:
  10. Electrostatic Powder Coating ; Corrosion ; COMSOL Software ; Precipitation Efficiency ; Collection Electrodes

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