Thermodynamic Modelling of Petroleum Fluids

Hemptinne, J.-C. de; Béhar, E.

doi:10.2516/ogst:2006036a

Cited by 20 publications

(13 citation statements)

References 54 publications

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“…For such fluids, EOS can model the simulation problem. For example, the SRK and PR models are used to analyse hydrocarbon systems at a pressure above one atmosphere [17][18][19]. Additionally, representing two phases with a model is needed.…”

Section: Simulation Modelmentioning

confidence: 99%

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Simulation of High Pressure Separator Used in Crude Oil Processing

Al-Mhanna

2018

Processes

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The aim of this research was to simulate a high-pressure (HP) separator in order to investigate the effect of changing separator operating conditions on product properties. In this study, the results obtained using the CHEMCAD simulation software package were compared with those obtained using the UniSim software package. The simulation results were comparable with industrial data. A sensitivity study was conducted by changing the gas stream properties, such as temperature, pressure, and flow rate, in order to investigate and optimize the process. The results showed that increasing the separator inlet pressure from 30 to 80 bar decreased the outlet gas flow rate from 1202 to 871.15 kmol/h. Also, the methane mole fraction increased from 0.69 to 0.74; however, the preheater heating duty was increased from 8.71 to 11.48 GJ/h. The simulation results showed that increasing the temperature of the separator feed stream from 43 to 83 °C increased the flow rate of the outlet gas stream from 871.15 to 1142.98 kmol/h. However, this temperature change reduced the methane concentration in the gas product and decreased the heating duty of the heat exchanger. Finally, the study demonstrated that there is no effect of increasing the inlet feed flow rate on the produced methane gas concentration.

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Section: Simulation Modelmentioning

confidence: 99%

“…Additionally, representing two phases with a model is needed. However, the pressure has an influence on the liquid phase in many applications [17]. Furthermore, the gas phase deviates from the ideal case above atmospheric pressure, which requires the use of EOS for the gas phase.…”

Section: Simulation Modelmentioning

confidence: 99%

Simulation of High Pressure Separator Used in Crude Oil Processing

Al-Mhanna

2018

Processes

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“…Other data regarding state equation of other fluids are available in Neau et al (1995) and more recently in de Hemptinne and Béhar (2006). A more precise description of these phenomena can be found in Lacassagne et al (2017) who explained the physical phenomena acting in the liquid phase during the transfer of a gas at a flat twophase interface and who measured the influence of these phenomena on mass exchanges.…”

Section: Thermodynamic Modellingmentioning

confidence: 99%

Evaporation flow assessment from petroleum product storage tanks exposed to fire conditions

Ginestet

Bot

2018

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Abstract. Fire around storage tanks for petroleum products can have disastrous consequences for the environment and the population. These fires, due to accident or arson, are very well managed by security divisions but, nevertheless, involve the release of an amount of vapour from the petroleum present in the storage device. The exposure of a non-refrigerated aboveground liquid petroleum or petroleum product storage tank to fire can also lead to internal overpressure. PV-valves ensure that the normal and emergency venting requirements are satisfied, and determination of such requirements is key for the safety of petroleum tanks and should not be underestimated. This paper presents and discusses some methods that can be used to evaluate the vapour flow. In the aim of finding an exact answer rapidly, a thermal analytical approach is first investigated, which reveals the complexity of the solution. Thus, a numerical approach, based on finite-volume description, is used to set the first steps of the flow assessment. Based on a thermodynamic hypothesis, a simplified method is finally put forward for the evaluation of the amount of vapour released. The algorithm used to determine how temperature, pressure and flow evolve over time, which is very useful information for the safety of these devices, is then detailed and the results discussed.

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“…Soave 5 aðTÞ ¼ a c 1 þ mð1 À ffiffiffiffi ffi T r p Þ Â Ã 2 m ¼ 0:48 þ 1:574v À 0:176v 2 Peng-Robinson (PR) P ¼ RT VÀb À aðTÞ VðV þ bÞ þ bðVÀbÞ a c ¼ 0:457 24 ðRT c Þ 2 P c Table 3.2. Although typically considered purely empirical, these cubic EoS do possess certain characteristics, which justifies the name 'semi-empirical'.…”

Section: Eos Equationmentioning

confidence: 99%

Cubic Equations of State: The Classical Mixing Rules

Kontogeorgis

Folas

2009

Thermodynamic Models for Industrial Applications

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Cubic equations of state are classical high-pressure models. From a thermodynamic point of view, the term 'high pressure' refers to pressures high enough so as to have a significant effect on the thermodynamic properties of both phases, typically over 15-20 bar. High-pressure vapor-liquid equilibria (VLE) can be more complex than low-pressure VLE, since at high pressures both phases are non-ideal. At low pressures, the main source of non-ideality is the liquid phase. The non-ideality of the vapor phase at low pressures is typically about 10% and it can be estimated by, for example, corresponding states methods or the virial equation. K-charts and the Chao-Seader are popular methods for high-pressure VLE calculations for systems containing hydrocarbons and gases. By far, though, the most popular method is the equations of state, especially the cubic ones. In most cases, high-pressure VLE as found in nature and the chemical industry apply to mixtures with at least one subcritical and one supercritical component. In many oil-and gas-related systems, hydrocarbons are present together with gases (methane, ethane, CO 2 , N 2 , etc.) and sometimes water is also present.The two-and especially the three-parameter cubic equations of state (EoS) represent a family of classical but still very useful and widely applied engineering models. The most well-known EoS are the van der Waals (vdW), Redlich-Kwong (RK) (now mostly of historical value) and especially the Soave-Redlich-Kwong (SRK) and Peng-Robinson (PR) equations; the last two are typically employed in the petroleum and chemical industries. Such cubic EoS are still the primary choice of models today for petrochemicals, gas processing and air separation. 1,2 The most well-known cubic EoS together with the typical expressions often used for estimating their parameters are shown in Table 3.1.With reference to Table 3.1 and the methods shown for the estimation of the EoS parameters: T c is the critical temperature, P c is the critical pressure and T r is the reduced temperature (¼ T=T c ); and the generalization of the energy parameter as a function of temperature and the acentric factor, v, was first proposed by Soave. 5 The acentric factor, introduced by Pitzer, represents a measure of the acentricity (non-sphericity) of the molecule:v ¼ Àlog P sat r j Tr¼0:7 À 1:00 ð3:1Þwhere P sat r is the reduced vapor pressure (¼ P sat =P c ).

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Thermodynamic Modelling of Petroleum Fluids

Cited by 20 publications

References 54 publications

Simulation of High Pressure Separator Used in Crude Oil Processing

Simulation of High Pressure Separator Used in Crude Oil Processing

Evaporation flow assessment from petroleum product storage tanks exposed to fire conditions

Cubic Equations of State: The Classical Mixing Rules

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