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Simulation and Experimental Study of Carbon Dioxide Absorption in a Rotating Packed Bed (RPB)

Farzaneh, Ensieh | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58227 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Eini, Saeed; Farhadi, Fathollah; Hosseinpour, Vahid
  7. Abstract:
  8. The rotating packed bed reactor (RBR) is a new Process Intensification (PI) technology that is known as one of the most suitable equipment for enhancing the chemical absorption of carbon dioxide by reducing the scale, and significantly increasing mass transfer compared to packed bed (PB) columns. The aim of this thesis is to investigate the performance of the RBR in this process using an amine solvent. First, by designing and constructing a RBR with a rod bed, the effect of various operating conditions, including temperature, rotation speed, and liquid flow rate, on the absorption efficiency is investigated. It should be noted that in order to be similar to reality in the industry, these studies have been conducted for an inlet gas with 2% (flue gas from power plant) and 15% (flue gas from coal combustion) carbon dioxide. Then, by simulating a three-dimensional model of this reactor using computational fluid dynamics (CFD), the hydrodynamic behavior of the flows and the accuracy of the model for predicting the mass transfer rate between the two phases are evaluated. After performing a network independence test and selecting the optimal mesh, the simulation results were validated with experimental data from previous research. The results obtained from laboratory studies showed that increasing the temperature from 25 to 30 °C and increasing the residence time by increasing the bed height from 2 to 4 cm had a significant effect on improving the adsorption efficiency. The combination of high temperature with a rotation speed of 900 rpm, a liquid flow rate of 0.8 to 1 liter/min, and a higher bed height was able to increase the adsorption efficiency to 78.7% at an inlet concentration of 15% and 84.5% at an inlet concentration of 2%. Therefore, precise temperature control and setting optimal operating conditions play a key role in improving the performance of the adsorption process. A comparison of the RPB and PB at equal absorption rates shows that the RPB system employed in this project led to a 50% reduction in volume. In addition, a good agreement was observed between the simulation results and the laboratory data, which indicates the accuracy of the simulation performed
  9. Keywords:
  10. Computational Fluid Dynamics (CFD) ; Post-Combustion Carbon Capture ; Process Intensification ; Rotating Packed Bed Reactor ; Carbon Capture by Chemical Absorption

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