Name: MARLON LEMOS DE SOUZA
Type: MSc dissertation
Publication date: 15/12/2021
Advisor:
Name |
Role |
|---|---|
| JUAN SÉRGIO ROMERO SAENZ | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| DANIEL DA CUNHA RIBEIRO | External Examiner * |
| JUAN SÉRGIO ROMERO SAENZ | Advisor * |
| RENATO DO NASCIMENTO SIQUEIRA | Internal Examiner * |
Summary: Oil composes most of the world`s energy matrix and, therefore, it is necessary to understand the mechanisms that involve its production and extraction processes. Salt fouling of carbonate origin is one of the main problems related to the flow guarantee and the main factor that favors its crystallization is the solubility change of gaseous carbon dioxide (CO2(g)) in dissolving medium, contributing between 60% to 90% of the total precipitated content. With that in mind, this work aims to use Computational Fluid Dynamics (CFD) techniques with OpenFOAM software to analyze gaseous absorption and desorption mechanisms in plain water and estimate important parameters such as solubility, volumetric mass transfer coefficient, residence time, etc.
The CO2(g) concentration in water under known thermodynamic conditions was obtained in order to validate the application of Henry`s Law. The numerical results were compared with the Diamond and Ankinfiev (2003) model, revealing great agreement between the values, with maximum relative error of 0.41%. The time evolution of CO2 (g) concentration in a water column was built for a pressure range and compared with theoretical model of the dynamics of CO2(g) absorption in water developed by Tokumura et al. (2007), with the two curves presenting similar behavior and with the theoretical model revealing adequate with a maximum residual error less than 25,00% related to volumetric mass transfer coefficient. The concentration and volume fraction curve was also extracted for the co-current two-phase gas-liquid flow in horizontal pipes. Absorption and volume fraction of gas curve and residence time were also extracted for the co-current gas-liquid flow in horizontal pipe as a function of pipe length and time. The volumetric mass transfer coefficient was collected for the case of injection in deficit and compared with the study by Jepsen (1979), with errors within the range of 15,00%.
The study also shows the influence of certain parameters on the absorption process. The increase in absorption rate is directly proportional to the increase in gas superficial velocity and energy dissipation and the solubility, as expected, is directly proportional to pressure.
