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Hydrodynamic Analysis of Fuel Motion in a Binary Bubbling Fluidized Bed using Markov Chains Method

Alivandlai, Amir Hossein | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 56832 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Fotovat, Farzam
  7. Abstract:
  8. One of the main challenges in managing flow batteries usage is estimating their state of charge. Since The concentration of ions in the battery indicates the battery's charge and, on the other hand, the sensors for measuring the concentration are expensive, observers should be used to estimate the concentrations of the ions in the battery. This work is done by measuring the cell voltage, and finally, using the mathematical model of the battery, the amount of concentrations and state of charge is calculated. In this work, a vanadium flow battery was initially modeled accurately and mechanistically using COMSOL software to replace an actual flow battery in subsequent studies. Also, two simplifying assumptions are considered for the model, which significantly reduces the computational load of the simulation and, at the same time, maintains the accuracy of the output compared to the complete model. Then, in the next section, an electrochemical model (design model) is designed with consideration of ohmic and activation overpotentials, and three common observers, "Extended Kalman filter", "high gain", and "sliding mode", are implemented. By examining and evaluating their performance on the accurate battery model (COMSOL model), it was observed that in the same conditions, the "high gain" observer performed up to 4 times faster than the sliding model observer in terms of simulation speed. Also, in terms of the speed of getting the estimation error to zero, it was faster than the extended Kalman filter, although the simulation speed was higher with the extended Kalman filter. Also, the simulation results are in sufficient agreement with the experimental data available in similar articles
  9. Keywords:
  10. Markov Chain ; Freely Bubbling Fludized Bed ; Residence Time Distribution ; Gas-Liquid Fluidization ; Unrestricted Movements ; Restricted Movements ; Hydrodynamic Analysis

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