A method for calculating the liquid density for the CO2–H2O–NaCl system under CO2 storage condition

Li, Dedong; Graupner, Bastian; Bauer, Sebastian

doi:10.1016/j.egypro.2011.02.317

Cited by 29 publications

(12 citation statements)

References 21 publications

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“…Most recently, McBride-Wright et al [25; 26] reported measurements of the density of under-saturated aqueous CO2 + H2O mixtures using a vibrating-tube apparatus at pressures up to 100 MPa, over the temperature range (274 to 449) K, together with an empirical correlation for the partial molar volume of CO2 that was able to represent his density data to within ±0.04 %. Partial-molar volumes predicted using the correlations of Li et al [24] and McBride-Wright et al [25; 26] differed by up to 7 %, whereas partial molar volumes calculated using the correlation of Sedlbauer et al [22] had a maximum relative deviation of only 2.5 % from the model of McBride-Wright et al [25; 26].…”

Section: Existing Models For Predicting Saturated Phase Densitiesmentioning

confidence: 90%

“…In the case of nonelectrolyte solutes, such as CO2, the model was tested over the temperature range (303 to 725) K at pressures to 35 MPa. Subsequently Duan et al [23] and then Li et al [24] presented alternative empirical correlations for the partial molar volume of CO2 in both H2O + CO2 and NaCl(aq) + CO2 mixtures at temperatures between (273 and 573) K and pressures to 100 MPa. Most recently, McBride-Wright et al [25; 26] reported measurements of the density of under-saturated aqueous CO2 + H2O mixtures using a vibrating-tube apparatus at pressures up to 100 MPa, over the temperature range (274 to 449) K, together with an empirical correlation for the partial molar volume of CO2 that was able to represent his density data to within ±0.04 %.…”

Section: Existing Models For Predicting Saturated Phase Densitiesmentioning

confidence: 99%

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Saturated phase densities of (CO 2 + H 2 O) at temperatures from (293 to 450) K and pressures up to 64 MPa

Efika

Hoballah

et al. 2016

The Journal of Chemical Thermodynamics

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An apparatus consisting of an equilibrium cell connected to two vibrating tube densimeters and two syringe pumps was used to measure the saturated phase densities of CO2 + H2O at temperatures from (293 to 450) K and pressures up to 64 MPa, with estimated average standard uncertainties of 1.5 kg·m -3 for the CO2-rich phase and 1.0 kg·m -3 for the aqueous phase. The densimeters were housed in the same thermostat as the equilibrium cell and were calibrated in-situ using pure water, CO2 and helium. Following mixing, samples of each saturated phase were displaced sequentially at constant pressure from the equilibrium cell into the vibrating tube densimeters connected to the top (CO2-rich phase) and bottom (aqueous phase) of the cell. The aqueous phase densities are predicted to within 3 kg·m -3 using empirical models for the phase compositions and partial molar volumes of each . The density of the CO2-rich phase was always within about 8 kg·m -3 of the density for pure CO2 at the same pressure and temperature; the differences were most positive near the critical density, and became negative at temperatures above about 373 K and pressures below about 10 MPa. For this phase, the multi-parameter EOS of Gernert and Span describes the measured densities to within 5 kg·m -3, whereas the computationally-efficient cubic EOS model of Spycher and Pruess [Transport in Porous Media 2010, 82, 173-196], commonly used in simulations of subsurface CO2 sequestration, deviates from the experimental data by a maximum of about 3 kg·m -3.

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Section: Existing Models For Predicting Saturated Phase Densitiesmentioning

confidence: 90%

Section: Existing Models For Predicting Saturated Phase Densitiesmentioning

confidence: 99%

Saturated phase densities of (CO 2 + H 2 O) at temperatures from (293 to 450) K and pressures up to 64 MPa

Efika

Hoballah

et al. 2016

The Journal of Chemical Thermodynamics

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“…The model by Li et al [54] combines the density model by Mao and Duan [55] for aqueous NaCl solutions with a similar approach to that of Duan et al [56] for the density of CO 2 -H 2 O-NaCl solutions. Our modifications consisted of adopting the thermodynamic formulation IAPWS97 [57] for pure water density and calculating the volumetric Debye-Hückel limiting law slope by the linearization of an extensive dataset [58] of tabulated values.…”

Section: Accepted Manuscriptmentioning

confidence: 96%

“…A slightly modified version of the aqueous phase density model by Li et al [54], which accounts for dissolved CO 2, was incorporated into the analysis tool. The model by Li et al [54] combines the density model by Mao and Duan [55] for aqueous NaCl solutions with a similar approach to that of Duan et al [56] for the density of CO 2 -H 2 O-NaCl solutions.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Prerequisites for density-driven instabilities and convective mixing under broad geological CO2 storage conditions

Rasmusson

Fagerlund

Tsang

et al. 2015

Advances in Water Resources

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Prerequisites for density-driven instabilities and convective mixing under broad geological CO 2 storage conditions, Advances in Water Resources (2015), Highlights We develop an instability onset, onset time and steady convective flux-analysis tool.  A systematic analysis of prerequisites for enhanced solubility trapping is presented.  Indirect thermal effects on enhanced solubility trapping are non-negligible.  Shallow storage depths favor density-driven instability onset and short onset times.  Salinity determines the storage depth at which the largest convective fluxes occur. AbstractDirect atmospheric greenhouse gas emissions can be greatly reduced by CO 2 sequestration in deep saline aquifers. One of the most secure and important mechanisms of CO 2 trapping over large time scales is solubility trapping. In addition, the CO 2 dissolution rate is greatly enhanced if density-driven convective mixing occurs. We present a systematic analysis of the prerequisites for density-driven instability and convective mixing over the broad temperature, pressure, salinity and permeability conditions that are found in geological CO 2 storage. The onset of instability (Rayleigh-Darcy number, ), the onset time of instability and the steady convective flux are comprehensively calculated using a newly developed analysis tool that accounts for the thermodynamic and salinity dependence on solutally and thermally induced density change, viscosity, molecular and thermal diffusivity. Additionally, the relative influences of field characteristics are analysed through local and global sensitivity analyses.The results help to elucidate the trends of the , onset time of instability and steady convective flux under field conditions. The impacts of storage depth and basin type (geothermal gradient) are also explored and the conditions that favour or hinder enhanced solubility trapping are identified. Contrary to previous studies, we conclude that the geothermal gradient has a non-negligible effect on density-driven instability and convective mixing when considering both direct and indirect thermal effects because cold basin conditions, for instance, render higher compared to warm basin conditions. We also show that the largest is obtained for conditions that correspond to relatively shallow depths, measuring approximately 800 m, indicating that CO 2 storage at such depths favours the onset of density-driven instability and reduces onset times. However, shallow depths do not necessarily provide conditions that generate the largest steady convective fluxes; the salinity determines the storage depth at which the largest steady convective fluxes occur.

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“…Most data is not applicable to CO 2 sequestration because it does not correspond to the saturated state of dissolved CO 2 . We therefore use data reported by Li et al (2011), Song et al (2005, Bando et al (2004), and Teng et al (1997), for the density of saturated solutions. This data is plotted in Fig.…”

Section: Modeling Approachmentioning

confidence: 99%

A new model for the density of saturated solutions of CO2–H2O–NaCl in saline aquifers

Nomeli¹,

Tilton²,

Riaz³

2014

International Journal of Greenhouse Gas Control

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A method for calculating the liquid density for the CO2–H2O–NaCl system under CO2 storage condition

Cited by 29 publications

References 21 publications

Saturated phase densities of (CO 2 + H 2 O) at temperatures from (293 to 450) K and pressures up to 64 MPa

Saturated phase densities of (CO 2 + H 2 O) at temperatures from (293 to 450) K and pressures up to 64 MPa

Prerequisites for density-driven instabilities and convective mixing under broad geological CO2 storage conditions

A new model for the density of saturated solutions of CO2–H2O–NaCl in saline aquifers

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