Speeds of sound for a biogas mixture CH 4 + N 2 + CO 2 + CO from p = (1–12) MPa at T = (273, 300 and 325) K measured with a spherical resonator

Lozano-Martín, Daniel; Segovia, José J.; Martín, M. Carmen; Fernández-Vicente, Teresa; Campo, D. del

doi:10.1016/j.jct.2016.07.033

Cited by 11 publications

(10 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both the acoustic cavity and the transducer designs are based on those used by Trusler, Wakeham and Zarari [19][20][21] to measure pure methane and related mixtures. Further details concerning the setup may be found in [22][23][24], while only a brief description is given here. spring of electrical contact, 6. screw, 7. cover plate.…”

Section: Equipment Descriptionmentioning

confidence: 99%

Speed of sound for three binary (CH4 + H2) mixtures from p = (0.5 up to 20) MPa at T = (273.16 to 375) K

Lozano-Martín

Martín

Chamorro

et al. 2020

International Journal of Hydrogen Energy

Self Cite

View full text Add to dashboard Cite

Speed of sound is one of the thermodynamic properties that can be measured with least uncertainty and is of great interest in developing equations of state. Moreover, accurate models are needed by the H2 industry to design the transport and storage stages of hydrogen blends in the natural gas network. This research aims to provide accurate data for (CH4 + H2) mixtures of nominal (5, 10, and 50) mol-% of hydrogen, in the p = (0.5 up to 20) MPa pressure range and with temperatures T = (273.16, 300, 325, 350, and 375) K. Using an acoustic spherical resonator, speed of sound was determined with an overall relative expanded (k = 2) uncertainty of 220 parts in 10 6 (0.022 %). Data were compared to reference equations of state for natural gas-like mixtures, such as AGA8-DC92 and GERG-2008.Average absolute deviations below 0.095% and percentage deviations between 0.029% and up to 0.30%, respectively, were obtained. Additionally, results were fitted to the acoustic virial equation of state and adiabatic coefficients, molar isochoric heat capacities and molar isobaric heat capacities as perfect-gas, together with second and third acoustic virial coefficients, and were estimated. Density second virial coefficients were also obtained. KeywordsSpeed of sound; acoustic resonator; methane; hydrogen; heat capacities as perfect gas; virial coefficients R Molar gas constant, J•mol −1 •K −1 1 Component 1 of a binary mixture s Standard deviation 2 Component 2 of a binary mixture T Temperature, K AGA8 -DC92 Calculated from AGA8-DC92 equation of state u Standard uncertainty c Critical parameter U Expanded uncertainty EoS Calculated from an equation of state V Volume, m 3 exp Experimental data Vh Volume of the holes drilled in the transducer backplate, m 3 GERG -2008

show abstract

Section: Equipment Descriptionmentioning

confidence: 99%

Speed of sound for three binary (CH4 + H2) mixtures from p = (0.5 up to 20) MPa at T = (273.16 to 375) K

Lozano-Martín

Martín

Chamorro

et al. 2020

International Journal of Hydrogen Energy

Self Cite

View full text Add to dashboard Cite

show abstract

“…The pressure and temperature measurement system have been extensively described in our previous papers [18], [19], so this section contains only a summary. Pressure is determined with a piezoelectric Digiquartz 2300A-101 transducer thermally isolated at the top of the gas inlet tube.…”

Section: Quasi Spherical Cavity Description and Geometrical Charactermentioning

confidence: 99%

“…The effect of the hydrostatic column of gas is added to the pressure measurement. The to the copper block that suspends the acoustic cavity inside and which are also positioned along the side and base of the jacket (see [19] for a detailed description). The stability of temperature through all repetitions amounts to a maximum of 0.6 mK.…”

Section: Quasi Spherical Cavity Description and Geometrical Charactermentioning

confidence: 99%

“…The bridge has been configured to get the maximum accuracy in temperature measurement: source impedance set to 10 Ω; 1mA carrier at 75 Hz; in-phase detector gain to 10 4 ; and bandwidth to 0.1 Hz in automatic balance mode. The CSPRTs have been calibrated again before this experiment at TTPW by using a triple point of water cell previously compared with the group of cells which maintain the Spanish national standards following the procedure of the triple point of water fixed-point realization reported in[19]. The self-heating effect has been taken into account using the procedure described in[7] using the same measurement bridge, referenceresistance and connection cables as later.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Updated determination of the molar gas constantRby acoustic measurements in argon at UVa-CEM

et al. 2017

View full text Add to dashboard Cite

A new determination of the molar gas constant was performed from measurements of the speed of sound in argon at the triple point of water and extrapolation to zero pressure. A new resonant cavity was used. This is a triaxial ellipsoid whose walls are gold-coated steel and which is divided into two identical halves that are bolted and sealed with an O-ring. Microwave and electroacoustic traducers are located in the northern and southern parts of the cavity, respectively, so that measurements of microwave and acoustic frequencies are carried out in the same experiment. Measurements were taken at pressures from 600 kPa to 60 kPa and at 273.16 K. The internal equivalent radius of the cavity was accurately determined by microwave measurements and the first four radial symmetric acoustic modes were simultaneously measured and used to calculate the speed of sound. The improvements made using the new cavity have reduced by half the main contributions to the uncertainty due to the radius determination using microwave measurements which amounts to 4.7 parts in 10 6 and the acoustic measurements, 4.4 parts in 10 6 , where the main contribution (3.7 parts in 10 6) is the relative excess half-widths associated with the limit of our acoustic model, compared with our previous measurements. As a result of all the improvements with the new cavity and the measurements performed, we determined the molar gas constant R = (8.314449  0.000056) J•K-1 •mol-1 which corresponds to a relative standard uncertainty of 6.7 parts in 10 6. The value reported in this paper lies-1.3 parts 2 in 10 6 below the recommended value of CODATA 2014, although still within the range consistent with it.

show abstract

“…The European Commission has issued mandate M/475 to European Committee for Standardization (CEN) [22] concerning the specifications of biogas and biomethane for their injection into natural gas grids and use as transport fuel. Our research group was a partner in the "Metrology for Biogas" project EMRP ENG54 together with twelve European National Metrology Institutes where thermophysical property measurements were performed to characterize the thermodynamic behavior of biogas and biomethane [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

A novel technique based in a cylindrical microwave resonator for high pressure phase equilibrium determination

Susial

Gómez-Hernández

Lozano-Martín

et al. 2019

The Journal of Chemical Thermodynamics

Self Cite

View full text Add to dashboard Cite

The development of a novel technique based on a cylindrical microwave resonator for high pressure phase equilibrium determination is described. Electric permittivity or dielectric constant is a physical property that depends on temperature and pressure ε(p,T). Based on this property, a measuring technique consisting of a cylindrical resonant cavity that works in the microwave spectrum has been developed. Equilibrium data of fluid mixtures are measured at high pressure using a synthetic method, where phase transition is determined under isothermal conditions due to the change of the dielectric constant. This technique may be a more accurate alternative to conventional visual synthetic methods.The technique was validated measuring pure CO2, and phase behaviour was then determined for two binary mixtures [CO2 (0.6) + CH4 (0.4)] and [CO2 (0.4) + CH4 (0.6)], results for which are presented. These systems are interesting for the study of biogas-like mixtures. In addition, data were compared with the equation of state used for natural gas GERG-2008, and also, they were modelled using Peng-Robinson equation of state and Wong-Sandler mixing rules, which are widely employed in chemical industries and which give good results.

show abstract

Speeds of sound for a biogas mixture CH 4 + N 2 + CO 2 + CO from p = (1–12) MPa at T = (273, 300 and 325) K measured with a spherical resonator

Cited by 11 publications

References 19 publications

Speed of sound for three binary (CH4 + H2) mixtures from p = (0.5 up to 20) MPa at T = (273.16 to 375) K

Speed of sound for three binary (CH4 + H2) mixtures from p = (0.5 up to 20) MPa at T = (273.16 to 375) K

Updated determination of the molar gas constantRby acoustic measurements in argon at UVa-CEM

A novel technique based in a cylindrical microwave resonator for high pressure phase equilibrium determination

Contact Info

Product

Resources

About