Joule–Thomson inversion curves of mixtures by molecular simulation in comparison to advanced equations of state: Natural gas as an example

2007 ◽  
Vol 258 (1) ◽  
pp. 34-40 ◽  
Author(s):  
Jadran Vrabec ◽  
Ashish Kumar ◽  
Hans Hasse
Keyword(s):  
Natural Gas ◽  
Molecular Simulation ◽  
Equations Of State

Technique and results of experimental determination of the compressibility factor of the natural gas

2021 ◽  
pp. 35-40
Author(s):  
Denis Y. Kutovoy ◽  
Igor A. Yatsenko ◽  
Vladimir B. Yavkin ◽  
Aydar N. Mukhametov ◽  
Petr V. Lovtsov ◽  
...  
Keyword(s):  
Natural Gas ◽  
Equations Of State ◽  
Compressibility Factor ◽  
High Accuracy ◽  
State Equations ◽  
Actual Problem ◽  
Temperature Range ◽  
Relative Value ◽  
Compressibility Coefficient

The actual problem of the possibility of using the equations of state for the gas phase of natural gas at temperatures below 250 K is considered. To solve it, the compressibility coefficients of natural gas obtained experimentally with high accuracy are required. The technique was developed and experimental study was carried out of compressibility factor aiming expanding temperature range of the state equations GERG-2004 and AGA8-DC92. The proposed technique is based on the fact that to assess the applicability of the equation of state, it is sufficient to obtain the relative value of the compressibility coefficient and not to determine its absolute value. The technique does not require complex equipment and provides high accuracy. The technique was tested on nitrogen, argon, air and methane. Uncertainty of determination of the compressibility factor is not greater than 0.1 %. For two different compositions of natural gas, obtained experimental data were demonstrated that the equations of state GERG-2004 and AGA8-92DC provide uncertainty of the calculation of the compressibility coefficient within 0.1 % in the temperature range from 220 K to 250 K and pressure below 5 MPa.

Transport of Methane Confined in Nanoscale Silica Pores

2011 ◽  
Vol 347-353 ◽  
pp. 3425-3429
Author(s):  
Qing Yin Zhang ◽  
Dong Lai Qi
Keyword(s):  
Natural Gas ◽  
Molecular Simulation ◽  
Amorphous Silica ◽  
Diffusion Coefficients ◽  
Nanoporous Materials ◽  
Surface Structures ◽  
Compressed Natural Gas ◽  
Promising Alternative ◽  
Increasing Temperature ◽  
Diffusion Behaviors

Natural gas (methane is the primary constituent) adsorbed on nanoporous materials is a promising alternative to compressed natural gas as a cleaning fuel. To understand the transport of methane confined in a nanoscale pore is useful for developing and optimizing some related industry processes. Equilibrium molecular simulation were carried out to study the transport behaviors of methane confined in two types silica pores, a cristobalite silica pore and an amorphous silica pore. Many factors, such as temperatures, densities of methane and surface structures of pore, which could affect the transport of methane, were examined in simulations. Simulations calculated the diffusion coefficients of methane at different densities and temperatures. The detailed microscopic structures of pores have a great correlation with the diffusion behaviors of methane. The diffusion coefficients of methane increased with increasing temperature, but decreased with the increase of density.

A Comparison Between PSRK and GERG-2004 Equation of State for Simulation of Non-Isothermal Compressible Natural Gases Mixed with Hydrogen in Pipelines / Porównanie równań stanu opracowanych według metody PSRK oraz GERG-2004 wykorzystanych do symulacji zachowania ściśliwych mieszanin gazu ziemnego i wodoru w rurociągach, w warunkach przepływów nie-izotermicznych

2013 ◽  
Vol 58 (2) ◽  
pp. 579-590
Author(s):  
Frits E. Uilhoorn
Keyword(s):  
Equation Of State ◽  
Natural Gas ◽  
Gas Flow ◽  
Transient Flow ◽  
Equations Of State ◽  
Group Contribution Method ◽  
Flow Conditions ◽  
Fluid Approximation ◽  
Natural Gases

In this work, the GERG-2004 equation of state based on a multi-fluid approximation explicit in the reduced Helmholtz energy is compared with the predictive Soave-Redlich-Kwong group contribution method. In the analysis, both equations of state are compared by simulating a non-isothermal transient flow of natural gas and mixed hydrogen-natural gas in pipelines. Besides the flow conditions also linepack-energy and energy consumption of the compressor station are computed. The gas flow is described by a set of partial differential equations resulting from the conservation of mass, momentum and energy. A pipeline section of the Yamal-Europe gas pipeline on Polish territory has been selected for the case study.

Molecular Simulation of Adsorbed Natural Gas

1992 ◽  
Vol 27 (14) ◽  
pp. 1825-1836 ◽  
Author(s):  
Kimberly R. Matranga ◽  
Albert Stella ◽  
Alan L. Myers ◽  
Eduardo D. Glandt
Keyword(s):  
Natural Gas ◽  
Molecular Simulation ◽  
Adsorbed Natural Gas
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