Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
THERMOPHYSICAL PROPERTIES FOR CO2 AND CO2 RICH MIXTURES PREDICTED USING A CPA EOS
Submission Author:
Matheus Vitor Rocha Pereira , PR
Co-Authors:
Matheus Vitor Rocha Pereira, Moisés Marcelino Neto, Rigoberto Morales
Presenter: Matheus Vitor Rocha Pereira
doi://10.26678/ABCM.COBEM2021.COB2021-1563
Abstract
In order to project or evaluate the operational parameters for systems involving injection or reinjection of CO2 it is essential to know the main state properties as well as the transport properties of the fluid concerned. Particularly for applications on the oil and gas industry it is crucial not only access the properties for pure carbon dioxide but also for a great range of mixtures contemplating the natural impurities often found alongside this substance. Once the value of most of the thermophysical proprieties are strongly affected by the composition of the fluid and the conditions of temperature and pressure it is interesting to explore methods to predict these properties applying an equation of state (EoS) which has the same inputs. One of the most commonly tested EoS for such activities are the cubic equations of state. These equations are simple and often demand no more than critical proprieties for its operation. Also, these EoS are well known for being appropriate for modeling systems with hydrocarbons, as well as other simple nonpolar substances as carbon dioxide. However, these equations do not wield good results when applied for polar fluids, such as water, therefore an addition of an associative term to the model is necessary hence the Cubic Plus Association EoS was chosen. In this present work the properties specific mass, enthalpy, entropy, and specific heat were calculated using CPA to pure CO2 and mixtures involving methane, propane, nitrogen and water for temperatures and pressures ranging from 250 to 600 K and 10 to 700 bar, respectively. The ranges of pressure and temperature were chosen based on the conditions found on the industry of oil and gas. The results were compared with experimental correlated data and it was observed that the average deviation was in a satisfactory level for the proposed application.
Keywords
CPA, CO2 rich mixtures, thermophysical properties, Oil and Gas industry
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