EOS-LNG: A Fundamental Equation of State for the Calculation of Thermodynamic Properties of Liquefied Natural Gases

IF 4.4 2区工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of Physical and Chemical Reference Data Pub Date : 2019-07-22 DOI:10.1063/1.5093800

M. Thol, M. Richter, E. May, E. Lemmon, R. Span

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引用次数: 35

Abstract

A new mixture model (EOS-LNG) for the accurate representation of thermodynamic property data of multicomponent natural gas mixtures in the liquid state is presented. The mathematical approach of the GERG-2008 equation of state of Kunz and Wagner is adopted and new binary-specific functions for methane + n-butane, methane + isobutane, methane + n-pentane, and methane + isopentane are developed. The representation of all experimental data available in the literature for the corresponding binary systems is carefully analyzed so that these functions can also be applied at fluid states beyond the liquefied natural gas (LNG) region. The EOS-LNG represents all available binary and multicomponent data in the LNG region within their specified experimental uncertainty, which is significantly more accurate than the GERG-2008 model. The main focus was given to the representation of new density data measured between 100 K and 180 K with a maximum pressure of 10 MPa. Deviations from the EOS-LNG presented here do not exceed 0.02% for binary data and 0.05% for multicomponent systems. Deviations of calculated values of these data from experimental data in other fluid regions are similar to or better than those calculated with the GERG-2008 model.A new mixture model (EOS-LNG) for the accurate representation of thermodynamic property data of multicomponent natural gas mixtures in the liquid state is presented. The mathematical approach of the GERG-2008 equation of state of Kunz and Wagner is adopted and new binary-specific functions for methane + n-butane, methane + isobutane, methane + n-pentane, and methane + isopentane are developed. The representation of all experimental data available in the literature for the corresponding binary systems is carefully analyzed so that these functions can also be applied at fluid states beyond the liquefied natural gas (LNG) region. The EOS-LNG represents all available binary and multicomponent data in the LNG region within their specified experimental uncertainty, which is significantly more accurate than the GERG-2008 model. The main focus was given to the representation of new density data measured b...

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EOS-LNG：计算液化天然气热力学性质的基本状态方程

提出了一种能够准确表示液态多组分天然气混合物热力学性质数据的新型混合物模型(EOS-LNG)。采用GERG-2008 Kunz和Wagner状态方程的数学方法，建立了新的甲烷+正丁烷、甲烷+异丁烷、甲烷+正戊烷和甲烷+异戊烷的二元特异函数。在相应的二元系统的文献中，所有可用的实验数据的表示都经过仔细分析，以便这些函数也可以应用于液化天然气(LNG)区域以外的流体状态。EOS-LNG在其指定的实验不确定性范围内代表了LNG区域所有可用的二元和多组分数据，其精度明显高于geg -2008模型。重点介绍了在最大压力为10 MPa的100k至180k范围内测量的新密度数据的表示。二元数据与EOS-LNG的偏差不超过0.02%，多组分系统的偏差不超过0.05%。这些数据的计算值与其他流体区域实验数据的偏差与geg -2008模型计算值相似或更好。提出了一种能够准确表示液态多组分天然气混合物热力学性质数据的新型混合物模型(EOS-LNG)。采用GERG-2008 Kunz和Wagner状态方程的数学方法，建立了新的甲烷+正丁烷、甲烷+异丁烷、甲烷+正戊烷和甲烷+异戊烷的二元特异函数。在相应的二元系统的文献中，所有可用的实验数据的表示都经过仔细分析，以便这些函数也可以应用于液化天然气(LNG)区域以外的流体状态。EOS-LNG在其指定的实验不确定性范围内代表了LNG区域所有可用的二元和多组分数据，其精度明显高于geg -2008模型。主要的重点是对新密度数据的表示。

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来源期刊

Journal of Physical and Chemical Reference Data 化学-化学综合

CiteScore

6.90

自引率

11.60%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Physical and Chemical Reference Data (JPCRD) is published by AIP Publishing for the U.S. Department of Commerce National Institute of Standards and Technology (NIST). The journal provides critically evaluated physical and chemical property data, fully documented as to the original sources and the criteria used for evaluation, preferably with uncertainty analysis. Critical reviews may also be included if they document a reference database, review the data situation in a field, review reference-quality measurement techniques, or review data evaluation methods.