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NOx Reduction from the Exhaust Gas of Marine Diesel Engines Using Non-Thermal Plasma

Marizad, Marzieh | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51022 (06)
  4. University: Sharif University of Technology
  5. Department: Environment
  6. Advisor(s): Borghei, Mehdi; Hamzehlouyan, Tayebeh; Hajjar, Zeinab; Khani, Mohammad Reza
  7. Abstract:
  8. Environmental regulations with respect to the marine diesel emissions have become stricter during recent years, thereby imposing traffic limitations on Iranian ships preventing them to enter emission control areas. Nitrogen oxides (NOx), as one of most important air pollutants, have adverse impacts on public health and ecosystem, so as the ships are the primary source of NOx internationally, the after-treatment system finds more urge to be developed. In this study, a NOx reduction system using non-thermal plasma technology is studied in order to determine its application and efficiency for NOx removal from the exhaust gas of Iranian marine diesel engines. Meanwhile, important factors were taken into account, including NOx emissions allowed to Iranian ships and the deadline to reach the desired emission level. Among the commercial and new technologies, non-thermal plasma is gaining more interest because of its tempting advantages like less waste or less by-product and the decreased need to use chemical processes. In the present study, a non-thermal plasma reactor was set up, and its application for NOx removal in the range of 300-700 ppm was investigated. The research was done for a range of fundamental parameters as gas flow rate, reactor power and inlet concentration to discover their effect on NOx removal efficiency. Also, gaseous species including oxygen were introduced to the reactor and proved to have a negative impact on the efficiency. At last, a series of experiments were designed by Design-Expert 10.0.7 based on Response Surface Methodology (RSM) to model the NOx reduction system and develop an equation of output NOx concentration. The model showed that the most significant parameter in the system’s efficiency is power. According to the results, the optimum power of 180 W was obtained for the non-thermal plasma reactor under study
  9. Keywords:
  10. Response Surface Methodology ; Nonthermal Plasma ; Air Pollutants Control ; Marine Diesel Engine ; Nitrogen Oxide Removal

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