bachelorThesis
Modelagem termodinâmica do equilíbrio líquido-vapor (ELV) da mistura metano-etanol
Fecha
2019-06-28Registro en:
BOCCIA, Rodrigo de Souza. Modelagem termodinâmica do equilíbrio líquido-vapor (ELV) da mistura metano-etanol. 2019. Trabalho de Conclusão de Curso (Graduação em Engenharia Mecânica) - Universidade Tecnológica Federal do Paraná, Curitiba, 2019.
Autor
Boccia, Rodrigo de Souza
Resumen
The oil and gas industry desires the extraction of fluids through the production wells to have the best efficiency possible, since this industry has a high degree of competition and the demand of oil byproducts rises year by year. Thus, many artificial elevation methods are used (as the Gas Lift method) to increase the oil and gas flow in the pipeline, in order to keep the wells under maximum possible production. Such elevation techniques are used in offshore applications that commonly work under critical temperature and pressure conditions (such as low temperature and high pressure). Over these conditions, hydrates (crystal structures) can be formed inside the oil and gas extraction pipeline, jeopardizing the optimum flow and the safety of the production process. The most common method to prevent this kind of issue is to inject hydrate inhibitors additives inside the extraction pipeline. In Brazil, ethanol is one of the great options of inhibitor additive, due its efficiency and the abundance in the country. In some cases, the inhibitor has been injected through the Gas Lift line, together with the ascending gas (methane), although this line has not been designed for this function. A thermodynamic analysis of the liquid-vapor equilibrium (LVE) for methane-ethanol mixture was performed through the Soave-Redlich-Kwong (SRK) equation of state (EoS), together with the implementation of algorithms available in the literature, to make it possible to obtain Drew and Bubble points
curves, under temperatures between 277 and 313K and pressures from 100 to 250 bar. With such curves, it was possible to determine that, for these conditions, methane-ethanol mixture will be under biphasic state, what means that besides the gas phase, liquid phase will also be present. This result can be harmful for the valves of the Gas Lift system, since they were designed to operate under the gas phase, only.