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Study on Continuous Phase Holdup in a Pulsed Disc and Doughnut Extraction Column by Radiotracer Technique

Yaghoubi, Yaser | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46323 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Outokesh, Mohammad; Tabasi, Mohsen; Mostaedi, M.T
  7. Abstract:
  8. The dispersed phase holdup is one of the important parameters in the design pulsed column and set the column diameter, height and characteristics of flooding and mass transfer. High efficiency and low space requirements of these columns cause is particularly in the nuclear industry, Due to the possible presence of radiation and the need for protection against radiation, considered and used. In this project, the dispersed phase holdup and mean residence time in a pulsed disc and donut column in a semi-industrial scale using radiotracer and shut down methods compared and presented for water-kerosene system. Also axial dispersion coefficient in the column using radiotracer methods is calculated by the dispersion model. The radiotracer techniques using two detectors at the top and bottom of the column and 99mTc is used as a radioactive tracer. The effects of operational variables such as pulsation frequency and amplitude and dispersed and continuous phase flow rates were investigated. Several empirical correlations obtained for predicting the dispersed phase holdup, slip velocity, mean residence time and the peclet number. Error of correlations for prediction of the dispersed phase holdup, slip velocity, mean residence time and the peclet number were 6.9%, 8.88%, 6.7%, 23.4%, respectively. The results and experimental observations indicate that the dispersed phase hold up being obtained with a radiotracer techniques compared to shut down methods has an average error of approximately 5%
  9. Keywords:
  10. Dispersed Phase Holdup ; Disc and Doughnut Column ; Radio Tracer ; Residence Time Distribution

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