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Study of Gas-Solid Slugging Fluidized Bed with Geldart D Particles Using High-Temperature Electrical Capacitance Volume Tomography

Xu, Mingyuan, Xu
http://rave.ohiolink.edu/etdc/view?acc_num=osu1500623814771833

Abstract Details

2017, Master of Science, Ohio State University, Chemical Engineering.
Electrical capacitance volume tomography (ECVT) is a novel 3-D imaging technology for multiphase flow systems. It can capture dynamic flow behaviors in real time and with sufficient fidelity, which can be useful for laboratory fluid mechanics studies as well as industrial process monitoring and diagnosis. To date, ECVT has been successfully applied to various multiphase flow systems, including gas-solid fluidized bed, gas-liquid bubbling bed, gas-solid-liquid trickle bed and flow systems with complex geometries. However, since ECVT was initially developed only for cold flow systems, most of the experiments are conducted at ambient temperature. High-temperature applications of ECVT are greatly desired since most industrial processes operate at elevated temperatures. For example, it is proposed to use ECVT for imaging solid flow at 1000 °C in chemical looping systems to provide real time solids circulation data. To explore the possibilities of employing ECVT at high temperatures, a special heated fluidized bed test unit is built with ceramic inner lining in the ECVT sensor assembly, which protects the sensor from excess heat at high temperatures. Work in this thesis is focused on studying the slugging phenomenon at different temperatures in the fluidized bed test unit with Geldart D chemical looping oxygen carrier particles as the fluidized solid and air as the fluidizing gas. It not only serves to evaluate the performance of ECVT at high temperatures, but also to examine the effect of temperature on slugging fluidized bed behaviors. Little research has been published on this topic due to the difficulty of fluidized bed characterizations at high temperatures. The experiments were conducted at temperatures ranging from 25 °C to above 700 °C. The results show that slug rise velocity and frequency increase as gas velocity increases, which is consistent with literature data and theory. The results also show that the effect of temperature on the correlation between gas velocity and slug properties is minimal. In addition, a preliminary test for solids circulation rate measurement is conducted in the test unit to explore the proposed application of ECVT in chemical looping. Future plans for the test unit and continuing research on the slugging behavior are also proposed.
Liang-Shih Fan, Dr. (Advisor)
Jeffrey Chalmers, Dr. (Committee Member)
62 p.
Chemical Engineering
ECVT; slugging fluidized bed; high temperature imaging

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Citations

  • Xu, Xu, M. (2017). Study of Gas-Solid Slugging Fluidized Bed with Geldart D Particles Using High-Temperature Electrical Capacitance Volume Tomography [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1500623814771833

    APA Style (7th edition)

  • Xu, Xu, Mingyuan. Study of Gas-Solid Slugging Fluidized Bed with Geldart D Particles Using High-Temperature Electrical Capacitance Volume Tomography. 2017. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1500623814771833.

    MLA Style (8th edition)

  • Xu, Xu, Mingyuan. "Study of Gas-Solid Slugging Fluidized Bed with Geldart D Particles Using High-Temperature Electrical Capacitance Volume Tomography." Master's thesis, Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1500623814771833

    Chicago Manual of Style (17th edition)

osu1500623814771833
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This open access ETD is published by The Ohio State University and OhioLINK.