Loading...

Modeling of Membrane Contactors For Separation of Multi-Component Gases by Mixtures of Solvents

Memardoost, Saber | 2013

1292 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44087 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Soltanieh, Mohammad
  7. Abstract:
  8. In the present work a comprehensive mathematical model has been developed for CFD simulation of transport phenomena in the hollow fiber membrane contactors. The system which has been studied was a gas sweetening including methane, carbon dioxide, and hydrogen sulfide in the gas phase and MEA aqueous solution as the solvent. Effects of temperature distribution on the contactor efficiency predicted taking into account the heat of solution, the heat of reaction, and the viscous dissipation. Major focus of the present study was on dynamic behavior of the contactor considering the entrance regions of momentum, energy, and mass transfers. CFD methods have been developed to solve the nonlinear equations simultaneously and the results from the model validated with the available experimental data in the literature and excellent agreement was found. Effects of various operation properties (i.e., wetting fraction, gas and liquid inlet velocities, inlet pressure of the gas phase, CO2 and H2S volume fractions, inlet temperature of the solvent, and solvent concentration) on the contactor performance were studied. Generally, increasing the liquid velocity and solvent concentration increase the contactor performance; in opposite side increasing the wetting fraction, gas velocity, inlet pressure of the gas phase, and CO2 and H2S volume fractions decrease the contactor performance. Finally, we investigated the system’s steady-state response by analyzing the system’s response to different inlet conditions and boundary conditions; in situations which the inlet conditions of the gas or liquid phases change immediately. It can be helpful in controlling the contactor performance and also, outlet conditions of the contactor (i.e., CO2 and H2S concentrations in the outlet gas and MEA concentration in the outlet solvent)
  9. Keywords:
  10. Membrane Absorption ; Multi-Component Acid Gases ; Alkanolamine Solvents Mixture ; Transport Phenomena ; Membrane Contactor ; Computational Fluid Dynamics (CFD) ; Transition State

 Digital Object List

 Bookmark